linux/drivers/usb/host/oxu210hp-hcd.c
<<
>>
Prefs
   1/*
   2 * Copyright (c) 2008 Rodolfo Giometti <giometti@linux.it>
   3 * Copyright (c) 2008 Eurotech S.p.A. <info@eurtech.it>
   4 *
   5 * This code is *strongly* based on EHCI-HCD code by David Brownell since
   6 * the chip is a quasi-EHCI compatible.
   7 *
   8 * This program is free software; you can redistribute it and/or modify it
   9 * under the terms of the GNU General Public License as published by the
  10 * Free Software Foundation; either version 2 of the License, or (at your
  11 * option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful, but
  14 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 * for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software Foundation,
  20 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23#include <linux/module.h>
  24#include <linux/pci.h>
  25#include <linux/dmapool.h>
  26#include <linux/kernel.h>
  27#include <linux/delay.h>
  28#include <linux/ioport.h>
  29#include <linux/sched.h>
  30#include <linux/slab.h>
  31#include <linux/errno.h>
  32#include <linux/init.h>
  33#include <linux/timer.h>
  34#include <linux/list.h>
  35#include <linux/interrupt.h>
  36#include <linux/usb.h>
  37#include <linux/usb/hcd.h>
  38#include <linux/moduleparam.h>
  39#include <linux/dma-mapping.h>
  40#include <linux/io.h>
  41
  42#include <asm/irq.h>
  43#include <asm/unaligned.h>
  44
  45#include <linux/irq.h>
  46#include <linux/platform_device.h>
  47
  48#include "oxu210hp.h"
  49
  50#define DRIVER_VERSION "0.0.50"
  51
  52/*
  53 * Main defines
  54 */
  55
  56#define oxu_dbg(oxu, fmt, args...) \
  57                dev_dbg(oxu_to_hcd(oxu)->self.controller , fmt , ## args)
  58#define oxu_err(oxu, fmt, args...) \
  59                dev_err(oxu_to_hcd(oxu)->self.controller , fmt , ## args)
  60#define oxu_info(oxu, fmt, args...) \
  61                dev_info(oxu_to_hcd(oxu)->self.controller , fmt , ## args)
  62
  63static inline struct usb_hcd *oxu_to_hcd(struct oxu_hcd *oxu)
  64{
  65        return container_of((void *) oxu, struct usb_hcd, hcd_priv);
  66}
  67
  68static inline struct oxu_hcd *hcd_to_oxu(struct usb_hcd *hcd)
  69{
  70        return (struct oxu_hcd *) (hcd->hcd_priv);
  71}
  72
  73/*
  74 * Debug stuff
  75 */
  76
  77#undef OXU_URB_TRACE
  78#undef OXU_VERBOSE_DEBUG
  79
  80#ifdef OXU_VERBOSE_DEBUG
  81#define oxu_vdbg                        oxu_dbg
  82#else
  83#define oxu_vdbg(oxu, fmt, args...)     /* Nop */
  84#endif
  85
  86#ifdef DEBUG
  87
  88static int __attribute__((__unused__))
  89dbg_status_buf(char *buf, unsigned len, const char *label, u32 status)
  90{
  91        return scnprintf(buf, len, "%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s",
  92                label, label[0] ? " " : "", status,
  93                (status & STS_ASS) ? " Async" : "",
  94                (status & STS_PSS) ? " Periodic" : "",
  95                (status & STS_RECL) ? " Recl" : "",
  96                (status & STS_HALT) ? " Halt" : "",
  97                (status & STS_IAA) ? " IAA" : "",
  98                (status & STS_FATAL) ? " FATAL" : "",
  99                (status & STS_FLR) ? " FLR" : "",
 100                (status & STS_PCD) ? " PCD" : "",
 101                (status & STS_ERR) ? " ERR" : "",
 102                (status & STS_INT) ? " INT" : ""
 103                );
 104}
 105
 106static int __attribute__((__unused__))
 107dbg_intr_buf(char *buf, unsigned len, const char *label, u32 enable)
 108{
 109        return scnprintf(buf, len, "%s%sintrenable %02x%s%s%s%s%s%s",
 110                label, label[0] ? " " : "", enable,
 111                (enable & STS_IAA) ? " IAA" : "",
 112                (enable & STS_FATAL) ? " FATAL" : "",
 113                (enable & STS_FLR) ? " FLR" : "",
 114                (enable & STS_PCD) ? " PCD" : "",
 115                (enable & STS_ERR) ? " ERR" : "",
 116                (enable & STS_INT) ? " INT" : ""
 117                );
 118}
 119
 120static const char *const fls_strings[] =
 121    { "1024", "512", "256", "??" };
 122
 123static int dbg_command_buf(char *buf, unsigned len,
 124                                const char *label, u32 command)
 125{
 126        return scnprintf(buf, len,
 127                "%s%scommand %06x %s=%d ithresh=%d%s%s%s%s period=%s%s %s",
 128                label, label[0] ? " " : "", command,
 129                (command & CMD_PARK) ? "park" : "(park)",
 130                CMD_PARK_CNT(command),
 131                (command >> 16) & 0x3f,
 132                (command & CMD_LRESET) ? " LReset" : "",
 133                (command & CMD_IAAD) ? " IAAD" : "",
 134                (command & CMD_ASE) ? " Async" : "",
 135                (command & CMD_PSE) ? " Periodic" : "",
 136                fls_strings[(command >> 2) & 0x3],
 137                (command & CMD_RESET) ? " Reset" : "",
 138                (command & CMD_RUN) ? "RUN" : "HALT"
 139                );
 140}
 141
 142static int dbg_port_buf(char *buf, unsigned len, const char *label,
 143                                int port, u32 status)
 144{
 145        char    *sig;
 146
 147        /* signaling state */
 148        switch (status & (3 << 10)) {
 149        case 0 << 10:
 150                sig = "se0";
 151                break;
 152        case 1 << 10:
 153                sig = "k";      /* low speed */
 154                break;
 155        case 2 << 10:
 156                sig = "j";
 157                break;
 158        default:
 159                sig = "?";
 160                break;
 161        }
 162
 163        return scnprintf(buf, len,
 164                "%s%sport %d status %06x%s%s sig=%s%s%s%s%s%s%s%s%s%s",
 165                label, label[0] ? " " : "", port, status,
 166                (status & PORT_POWER) ? " POWER" : "",
 167                (status & PORT_OWNER) ? " OWNER" : "",
 168                sig,
 169                (status & PORT_RESET) ? " RESET" : "",
 170                (status & PORT_SUSPEND) ? " SUSPEND" : "",
 171                (status & PORT_RESUME) ? " RESUME" : "",
 172                (status & PORT_OCC) ? " OCC" : "",
 173                (status & PORT_OC) ? " OC" : "",
 174                (status & PORT_PEC) ? " PEC" : "",
 175                (status & PORT_PE) ? " PE" : "",
 176                (status & PORT_CSC) ? " CSC" : "",
 177                (status & PORT_CONNECT) ? " CONNECT" : ""
 178            );
 179}
 180
 181#else
 182
 183static inline int __attribute__((__unused__))
 184dbg_status_buf(char *buf, unsigned len, const char *label, u32 status)
 185{ return 0; }
 186
 187static inline int __attribute__((__unused__))
 188dbg_command_buf(char *buf, unsigned len, const char *label, u32 command)
 189{ return 0; }
 190
 191static inline int __attribute__((__unused__))
 192dbg_intr_buf(char *buf, unsigned len, const char *label, u32 enable)
 193{ return 0; }
 194
 195static inline int __attribute__((__unused__))
 196dbg_port_buf(char *buf, unsigned len, const char *label, int port, u32 status)
 197{ return 0; }
 198
 199#endif /* DEBUG */
 200
 201/* functions have the "wrong" filename when they're output... */
 202#define dbg_status(oxu, label, status) { \
 203        char _buf[80]; \
 204        dbg_status_buf(_buf, sizeof _buf, label, status); \
 205        oxu_dbg(oxu, "%s\n", _buf); \
 206}
 207
 208#define dbg_cmd(oxu, label, command) { \
 209        char _buf[80]; \
 210        dbg_command_buf(_buf, sizeof _buf, label, command); \
 211        oxu_dbg(oxu, "%s\n", _buf); \
 212}
 213
 214#define dbg_port(oxu, label, port, status) { \
 215        char _buf[80]; \
 216        dbg_port_buf(_buf, sizeof _buf, label, port, status); \
 217        oxu_dbg(oxu, "%s\n", _buf); \
 218}
 219
 220/*
 221 * Module parameters
 222 */
 223
 224/* Initial IRQ latency: faster than hw default */
 225static int log2_irq_thresh;                     /* 0 to 6 */
 226module_param(log2_irq_thresh, int, S_IRUGO);
 227MODULE_PARM_DESC(log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
 228
 229/* Initial park setting: slower than hw default */
 230static unsigned park;
 231module_param(park, uint, S_IRUGO);
 232MODULE_PARM_DESC(park, "park setting; 1-3 back-to-back async packets");
 233
 234/* For flakey hardware, ignore overcurrent indicators */
 235static bool ignore_oc;
 236module_param(ignore_oc, bool, S_IRUGO);
 237MODULE_PARM_DESC(ignore_oc, "ignore bogus hardware overcurrent indications");
 238
 239
 240static void ehci_work(struct oxu_hcd *oxu);
 241static int oxu_hub_control(struct usb_hcd *hcd,
 242                                u16 typeReq, u16 wValue, u16 wIndex,
 243                                char *buf, u16 wLength);
 244
 245/*
 246 * Local functions
 247 */
 248
 249/* Low level read/write registers functions */
 250static inline u32 oxu_readl(void *base, u32 reg)
 251{
 252        return readl(base + reg);
 253}
 254
 255static inline void oxu_writel(void *base, u32 reg, u32 val)
 256{
 257        writel(val, base + reg);
 258}
 259
 260static inline void timer_action_done(struct oxu_hcd *oxu,
 261                                        enum ehci_timer_action action)
 262{
 263        clear_bit(action, &oxu->actions);
 264}
 265
 266static inline void timer_action(struct oxu_hcd *oxu,
 267                                        enum ehci_timer_action action)
 268{
 269        if (!test_and_set_bit(action, &oxu->actions)) {
 270                unsigned long t;
 271
 272                switch (action) {
 273                case TIMER_IAA_WATCHDOG:
 274                        t = EHCI_IAA_JIFFIES;
 275                        break;
 276                case TIMER_IO_WATCHDOG:
 277                        t = EHCI_IO_JIFFIES;
 278                        break;
 279                case TIMER_ASYNC_OFF:
 280                        t = EHCI_ASYNC_JIFFIES;
 281                        break;
 282                case TIMER_ASYNC_SHRINK:
 283                default:
 284                        t = EHCI_SHRINK_JIFFIES;
 285                        break;
 286                }
 287                t += jiffies;
 288                /* all timings except IAA watchdog can be overridden.
 289                 * async queue SHRINK often precedes IAA.  while it's ready
 290                 * to go OFF neither can matter, and afterwards the IO
 291                 * watchdog stops unless there's still periodic traffic.
 292                 */
 293                if (action != TIMER_IAA_WATCHDOG
 294                                && t > oxu->watchdog.expires
 295                                && timer_pending(&oxu->watchdog))
 296                        return;
 297                mod_timer(&oxu->watchdog, t);
 298        }
 299}
 300
 301/*
 302 * handshake - spin reading hc until handshake completes or fails
 303 * @ptr: address of hc register to be read
 304 * @mask: bits to look at in result of read
 305 * @done: value of those bits when handshake succeeds
 306 * @usec: timeout in microseconds
 307 *
 308 * Returns negative errno, or zero on success
 309 *
 310 * Success happens when the "mask" bits have the specified value (hardware
 311 * handshake done).  There are two failure modes:  "usec" have passed (major
 312 * hardware flakeout), or the register reads as all-ones (hardware removed).
 313 *
 314 * That last failure should_only happen in cases like physical cardbus eject
 315 * before driver shutdown. But it also seems to be caused by bugs in cardbus
 316 * bridge shutdown:  shutting down the bridge before the devices using it.
 317 */
 318static int handshake(struct oxu_hcd *oxu, void __iomem *ptr,
 319                                        u32 mask, u32 done, int usec)
 320{
 321        u32 result;
 322
 323        do {
 324                result = readl(ptr);
 325                if (result == ~(u32)0)          /* card removed */
 326                        return -ENODEV;
 327                result &= mask;
 328                if (result == done)
 329                        return 0;
 330                udelay(1);
 331                usec--;
 332        } while (usec > 0);
 333        return -ETIMEDOUT;
 334}
 335
 336/* Force HC to halt state from unknown (EHCI spec section 2.3) */
 337static int ehci_halt(struct oxu_hcd *oxu)
 338{
 339        u32     temp = readl(&oxu->regs->status);
 340
 341        /* disable any irqs left enabled by previous code */
 342        writel(0, &oxu->regs->intr_enable);
 343
 344        if ((temp & STS_HALT) != 0)
 345                return 0;
 346
 347        temp = readl(&oxu->regs->command);
 348        temp &= ~CMD_RUN;
 349        writel(temp, &oxu->regs->command);
 350        return handshake(oxu, &oxu->regs->status,
 351                          STS_HALT, STS_HALT, 16 * 125);
 352}
 353
 354/* Put TDI/ARC silicon into EHCI mode */
 355static void tdi_reset(struct oxu_hcd *oxu)
 356{
 357        u32 __iomem *reg_ptr;
 358        u32 tmp;
 359
 360        reg_ptr = (u32 __iomem *)(((u8 __iomem *)oxu->regs) + 0x68);
 361        tmp = readl(reg_ptr);
 362        tmp |= 0x3;
 363        writel(tmp, reg_ptr);
 364}
 365
 366/* Reset a non-running (STS_HALT == 1) controller */
 367static int ehci_reset(struct oxu_hcd *oxu)
 368{
 369        int     retval;
 370        u32     command = readl(&oxu->regs->command);
 371
 372        command |= CMD_RESET;
 373        dbg_cmd(oxu, "reset", command);
 374        writel(command, &oxu->regs->command);
 375        oxu_to_hcd(oxu)->state = HC_STATE_HALT;
 376        oxu->next_statechange = jiffies;
 377        retval = handshake(oxu, &oxu->regs->command,
 378                            CMD_RESET, 0, 250 * 1000);
 379
 380        if (retval)
 381                return retval;
 382
 383        tdi_reset(oxu);
 384
 385        return retval;
 386}
 387
 388/* Idle the controller (from running) */
 389static void ehci_quiesce(struct oxu_hcd *oxu)
 390{
 391        u32     temp;
 392
 393#ifdef DEBUG
 394        if (!HC_IS_RUNNING(oxu_to_hcd(oxu)->state))
 395                BUG();
 396#endif
 397
 398        /* wait for any schedule enables/disables to take effect */
 399        temp = readl(&oxu->regs->command) << 10;
 400        temp &= STS_ASS | STS_PSS;
 401        if (handshake(oxu, &oxu->regs->status, STS_ASS | STS_PSS,
 402                                temp, 16 * 125) != 0) {
 403                oxu_to_hcd(oxu)->state = HC_STATE_HALT;
 404                return;
 405        }
 406
 407        /* then disable anything that's still active */
 408        temp = readl(&oxu->regs->command);
 409        temp &= ~(CMD_ASE | CMD_IAAD | CMD_PSE);
 410        writel(temp, &oxu->regs->command);
 411
 412        /* hardware can take 16 microframes to turn off ... */
 413        if (handshake(oxu, &oxu->regs->status, STS_ASS | STS_PSS,
 414                                0, 16 * 125) != 0) {
 415                oxu_to_hcd(oxu)->state = HC_STATE_HALT;
 416                return;
 417        }
 418}
 419
 420static int check_reset_complete(struct oxu_hcd *oxu, int index,
 421                                u32 __iomem *status_reg, int port_status)
 422{
 423        if (!(port_status & PORT_CONNECT)) {
 424                oxu->reset_done[index] = 0;
 425                return port_status;
 426        }
 427
 428        /* if reset finished and it's still not enabled -- handoff */
 429        if (!(port_status & PORT_PE)) {
 430                oxu_dbg(oxu, "Failed to enable port %d on root hub TT\n",
 431                                index+1);
 432                return port_status;
 433        } else
 434                oxu_dbg(oxu, "port %d high speed\n", index + 1);
 435
 436        return port_status;
 437}
 438
 439static void ehci_hub_descriptor(struct oxu_hcd *oxu,
 440                                struct usb_hub_descriptor *desc)
 441{
 442        int ports = HCS_N_PORTS(oxu->hcs_params);
 443        u16 temp;
 444
 445        desc->bDescriptorType = 0x29;
 446        desc->bPwrOn2PwrGood = 10;      /* oxu 1.0, 2.3.9 says 20ms max */
 447        desc->bHubContrCurrent = 0;
 448
 449        desc->bNbrPorts = ports;
 450        temp = 1 + (ports / 8);
 451        desc->bDescLength = 7 + 2 * temp;
 452
 453        /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 454        memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
 455        memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
 456
 457        temp = 0x0008;                  /* per-port overcurrent reporting */
 458        if (HCS_PPC(oxu->hcs_params))
 459                temp |= 0x0001;         /* per-port power control */
 460        else
 461                temp |= 0x0002;         /* no power switching */
 462        desc->wHubCharacteristics = (__force __u16)cpu_to_le16(temp);
 463}
 464
 465
 466/* Allocate an OXU210HP on-chip memory data buffer
 467 *
 468 * An on-chip memory data buffer is required for each OXU210HP USB transfer.
 469 * Each transfer descriptor has one or more on-chip memory data buffers.
 470 *
 471 * Data buffers are allocated from a fix sized pool of data blocks.
 472 * To minimise fragmentation and give reasonable memory utlisation,
 473 * data buffers are allocated with sizes the power of 2 multiples of
 474 * the block size, starting on an address a multiple of the allocated size.
 475 *
 476 * FIXME: callers of this function require a buffer to be allocated for
 477 * len=0. This is a waste of on-chip memory and should be fix. Then this
 478 * function should be changed to not allocate a buffer for len=0.
 479 */
 480static int oxu_buf_alloc(struct oxu_hcd *oxu, struct ehci_qtd *qtd, int len)
 481{
 482        int n_blocks;   /* minium blocks needed to hold len */
 483        int a_blocks;   /* blocks allocated */
 484        int i, j;
 485
 486        /* Don't allocte bigger than supported */
 487        if (len > BUFFER_SIZE * BUFFER_NUM) {
 488                oxu_err(oxu, "buffer too big (%d)\n", len);
 489                return -ENOMEM;
 490        }
 491
 492        spin_lock(&oxu->mem_lock);
 493
 494        /* Number of blocks needed to hold len */
 495        n_blocks = (len + BUFFER_SIZE - 1) / BUFFER_SIZE;
 496
 497        /* Round the number of blocks up to the power of 2 */
 498        for (a_blocks = 1; a_blocks < n_blocks; a_blocks <<= 1)
 499                ;
 500
 501        /* Find a suitable available data buffer */
 502        for (i = 0; i < BUFFER_NUM;
 503                        i += max(a_blocks, (int)oxu->db_used[i])) {
 504
 505                /* Check all the required blocks are available */
 506                for (j = 0; j < a_blocks; j++)
 507                        if (oxu->db_used[i + j])
 508                                break;
 509
 510                if (j != a_blocks)
 511                        continue;
 512
 513                /* Allocate blocks found! */
 514                qtd->buffer = (void *) &oxu->mem->db_pool[i];
 515                qtd->buffer_dma = virt_to_phys(qtd->buffer);
 516
 517                qtd->qtd_buffer_len = BUFFER_SIZE * a_blocks;
 518                oxu->db_used[i] = a_blocks;
 519
 520                spin_unlock(&oxu->mem_lock);
 521
 522                return 0;
 523        }
 524
 525        /* Failed */
 526
 527        spin_unlock(&oxu->mem_lock);
 528
 529        return -ENOMEM;
 530}
 531
 532static void oxu_buf_free(struct oxu_hcd *oxu, struct ehci_qtd *qtd)
 533{
 534        int index;
 535
 536        spin_lock(&oxu->mem_lock);
 537
 538        index = (qtd->buffer - (void *) &oxu->mem->db_pool[0])
 539                                                         / BUFFER_SIZE;
 540        oxu->db_used[index] = 0;
 541        qtd->qtd_buffer_len = 0;
 542        qtd->buffer_dma = 0;
 543        qtd->buffer = NULL;
 544
 545        spin_unlock(&oxu->mem_lock);
 546}
 547
 548static inline void ehci_qtd_init(struct ehci_qtd *qtd, dma_addr_t dma)
 549{
 550        memset(qtd, 0, sizeof *qtd);
 551        qtd->qtd_dma = dma;
 552        qtd->hw_token = cpu_to_le32(QTD_STS_HALT);
 553        qtd->hw_next = EHCI_LIST_END;
 554        qtd->hw_alt_next = EHCI_LIST_END;
 555        INIT_LIST_HEAD(&qtd->qtd_list);
 556}
 557
 558static inline void oxu_qtd_free(struct oxu_hcd *oxu, struct ehci_qtd *qtd)
 559{
 560        int index;
 561
 562        if (qtd->buffer)
 563                oxu_buf_free(oxu, qtd);
 564
 565        spin_lock(&oxu->mem_lock);
 566
 567        index = qtd - &oxu->mem->qtd_pool[0];
 568        oxu->qtd_used[index] = 0;
 569
 570        spin_unlock(&oxu->mem_lock);
 571}
 572
 573static struct ehci_qtd *ehci_qtd_alloc(struct oxu_hcd *oxu)
 574{
 575        int i;
 576        struct ehci_qtd *qtd = NULL;
 577
 578        spin_lock(&oxu->mem_lock);
 579
 580        for (i = 0; i < QTD_NUM; i++)
 581                if (!oxu->qtd_used[i])
 582                        break;
 583
 584        if (i < QTD_NUM) {
 585                qtd = (struct ehci_qtd *) &oxu->mem->qtd_pool[i];
 586                memset(qtd, 0, sizeof *qtd);
 587
 588                qtd->hw_token = cpu_to_le32(QTD_STS_HALT);
 589                qtd->hw_next = EHCI_LIST_END;
 590                qtd->hw_alt_next = EHCI_LIST_END;
 591                INIT_LIST_HEAD(&qtd->qtd_list);
 592
 593                qtd->qtd_dma = virt_to_phys(qtd);
 594
 595                oxu->qtd_used[i] = 1;
 596        }
 597
 598        spin_unlock(&oxu->mem_lock);
 599
 600        return qtd;
 601}
 602
 603static void oxu_qh_free(struct oxu_hcd *oxu, struct ehci_qh *qh)
 604{
 605        int index;
 606
 607        spin_lock(&oxu->mem_lock);
 608
 609        index = qh - &oxu->mem->qh_pool[0];
 610        oxu->qh_used[index] = 0;
 611
 612        spin_unlock(&oxu->mem_lock);
 613}
 614
 615static void qh_destroy(struct kref *kref)
 616{
 617        struct ehci_qh *qh = container_of(kref, struct ehci_qh, kref);
 618        struct oxu_hcd *oxu = qh->oxu;
 619
 620        /* clean qtds first, and know this is not linked */
 621        if (!list_empty(&qh->qtd_list) || qh->qh_next.ptr) {
 622                oxu_dbg(oxu, "unused qh not empty!\n");
 623                BUG();
 624        }
 625        if (qh->dummy)
 626                oxu_qtd_free(oxu, qh->dummy);
 627        oxu_qh_free(oxu, qh);
 628}
 629
 630static struct ehci_qh *oxu_qh_alloc(struct oxu_hcd *oxu)
 631{
 632        int i;
 633        struct ehci_qh *qh = NULL;
 634
 635        spin_lock(&oxu->mem_lock);
 636
 637        for (i = 0; i < QHEAD_NUM; i++)
 638                if (!oxu->qh_used[i])
 639                        break;
 640
 641        if (i < QHEAD_NUM) {
 642                qh = (struct ehci_qh *) &oxu->mem->qh_pool[i];
 643                memset(qh, 0, sizeof *qh);
 644
 645                kref_init(&qh->kref);
 646                qh->oxu = oxu;
 647                qh->qh_dma = virt_to_phys(qh);
 648                INIT_LIST_HEAD(&qh->qtd_list);
 649
 650                /* dummy td enables safe urb queuing */
 651                qh->dummy = ehci_qtd_alloc(oxu);
 652                if (qh->dummy == NULL) {
 653                        oxu_dbg(oxu, "no dummy td\n");
 654                        oxu->qh_used[i] = 0;
 655                        qh = NULL;
 656                        goto unlock;
 657                }
 658
 659                oxu->qh_used[i] = 1;
 660        }
 661unlock:
 662        spin_unlock(&oxu->mem_lock);
 663
 664        return qh;
 665}
 666
 667/* to share a qh (cpu threads, or hc) */
 668static inline struct ehci_qh *qh_get(struct ehci_qh *qh)
 669{
 670        kref_get(&qh->kref);
 671        return qh;
 672}
 673
 674static inline void qh_put(struct ehci_qh *qh)
 675{
 676        kref_put(&qh->kref, qh_destroy);
 677}
 678
 679static void oxu_murb_free(struct oxu_hcd *oxu, struct oxu_murb *murb)
 680{
 681        int index;
 682
 683        spin_lock(&oxu->mem_lock);
 684
 685        index = murb - &oxu->murb_pool[0];
 686        oxu->murb_used[index] = 0;
 687
 688        spin_unlock(&oxu->mem_lock);
 689}
 690
 691static struct oxu_murb *oxu_murb_alloc(struct oxu_hcd *oxu)
 692
 693{
 694        int i;
 695        struct oxu_murb *murb = NULL;
 696
 697        spin_lock(&oxu->mem_lock);
 698
 699        for (i = 0; i < MURB_NUM; i++)
 700                if (!oxu->murb_used[i])
 701                        break;
 702
 703        if (i < MURB_NUM) {
 704                murb = &(oxu->murb_pool)[i];
 705
 706                oxu->murb_used[i] = 1;
 707        }
 708
 709        spin_unlock(&oxu->mem_lock);
 710
 711        return murb;
 712}
 713
 714/* The queue heads and transfer descriptors are managed from pools tied
 715 * to each of the "per device" structures.
 716 * This is the initialisation and cleanup code.
 717 */
 718static void ehci_mem_cleanup(struct oxu_hcd *oxu)
 719{
 720        kfree(oxu->murb_pool);
 721        oxu->murb_pool = NULL;
 722
 723        if (oxu->async)
 724                qh_put(oxu->async);
 725        oxu->async = NULL;
 726
 727        del_timer(&oxu->urb_timer);
 728
 729        oxu->periodic = NULL;
 730
 731        /* shadow periodic table */
 732        kfree(oxu->pshadow);
 733        oxu->pshadow = NULL;
 734}
 735
 736/* Remember to add cleanup code (above) if you add anything here.
 737 */
 738static int ehci_mem_init(struct oxu_hcd *oxu, gfp_t flags)
 739{
 740        int i;
 741
 742        for (i = 0; i < oxu->periodic_size; i++)
 743                oxu->mem->frame_list[i] = EHCI_LIST_END;
 744        for (i = 0; i < QHEAD_NUM; i++)
 745                oxu->qh_used[i] = 0;
 746        for (i = 0; i < QTD_NUM; i++)
 747                oxu->qtd_used[i] = 0;
 748
 749        oxu->murb_pool = kcalloc(MURB_NUM, sizeof(struct oxu_murb), flags);
 750        if (!oxu->murb_pool)
 751                goto fail;
 752
 753        for (i = 0; i < MURB_NUM; i++)
 754                oxu->murb_used[i] = 0;
 755
 756        oxu->async = oxu_qh_alloc(oxu);
 757        if (!oxu->async)
 758                goto fail;
 759
 760        oxu->periodic = (__le32 *) &oxu->mem->frame_list;
 761        oxu->periodic_dma = virt_to_phys(oxu->periodic);
 762
 763        for (i = 0; i < oxu->periodic_size; i++)
 764                oxu->periodic[i] = EHCI_LIST_END;
 765
 766        /* software shadow of hardware table */
 767        oxu->pshadow = kcalloc(oxu->periodic_size, sizeof(void *), flags);
 768        if (oxu->pshadow != NULL)
 769                return 0;
 770
 771fail:
 772        oxu_dbg(oxu, "couldn't init memory\n");
 773        ehci_mem_cleanup(oxu);
 774        return -ENOMEM;
 775}
 776
 777/* Fill a qtd, returning how much of the buffer we were able to queue up.
 778 */
 779static int qtd_fill(struct ehci_qtd *qtd, dma_addr_t buf, size_t len,
 780                                int token, int maxpacket)
 781{
 782        int i, count;
 783        u64 addr = buf;
 784
 785        /* one buffer entry per 4K ... first might be short or unaligned */
 786        qtd->hw_buf[0] = cpu_to_le32((u32)addr);
 787        qtd->hw_buf_hi[0] = cpu_to_le32((u32)(addr >> 32));
 788        count = 0x1000 - (buf & 0x0fff);        /* rest of that page */
 789        if (likely(len < count))                /* ... iff needed */
 790                count = len;
 791        else {
 792                buf +=  0x1000;
 793                buf &= ~0x0fff;
 794
 795                /* per-qtd limit: from 16K to 20K (best alignment) */
 796                for (i = 1; count < len && i < 5; i++) {
 797                        addr = buf;
 798                        qtd->hw_buf[i] = cpu_to_le32((u32)addr);
 799                        qtd->hw_buf_hi[i] = cpu_to_le32((u32)(addr >> 32));
 800                        buf += 0x1000;
 801                        if ((count + 0x1000) < len)
 802                                count += 0x1000;
 803                        else
 804                                count = len;
 805                }
 806
 807                /* short packets may only terminate transfers */
 808                if (count != len)
 809                        count -= (count % maxpacket);
 810        }
 811        qtd->hw_token = cpu_to_le32((count << 16) | token);
 812        qtd->length = count;
 813
 814        return count;
 815}
 816
 817static inline void qh_update(struct oxu_hcd *oxu,
 818                                struct ehci_qh *qh, struct ehci_qtd *qtd)
 819{
 820        /* writes to an active overlay are unsafe */
 821        BUG_ON(qh->qh_state != QH_STATE_IDLE);
 822
 823        qh->hw_qtd_next = QTD_NEXT(qtd->qtd_dma);
 824        qh->hw_alt_next = EHCI_LIST_END;
 825
 826        /* Except for control endpoints, we make hardware maintain data
 827         * toggle (like OHCI) ... here (re)initialize the toggle in the QH,
 828         * and set the pseudo-toggle in udev. Only usb_clear_halt() will
 829         * ever clear it.
 830         */
 831        if (!(qh->hw_info1 & cpu_to_le32(1 << 14))) {
 832                unsigned        is_out, epnum;
 833
 834                is_out = !(qtd->hw_token & cpu_to_le32(1 << 8));
 835                epnum = (le32_to_cpup(&qh->hw_info1) >> 8) & 0x0f;
 836                if (unlikely(!usb_gettoggle(qh->dev, epnum, is_out))) {
 837                        qh->hw_token &= ~cpu_to_le32(QTD_TOGGLE);
 838                        usb_settoggle(qh->dev, epnum, is_out, 1);
 839                }
 840        }
 841
 842        /* HC must see latest qtd and qh data before we clear ACTIVE+HALT */
 843        wmb();
 844        qh->hw_token &= cpu_to_le32(QTD_TOGGLE | QTD_STS_PING);
 845}
 846
 847/* If it weren't for a common silicon quirk (writing the dummy into the qh
 848 * overlay, so qh->hw_token wrongly becomes inactive/halted), only fault
 849 * recovery (including urb dequeue) would need software changes to a QH...
 850 */
 851static void qh_refresh(struct oxu_hcd *oxu, struct ehci_qh *qh)
 852{
 853        struct ehci_qtd *qtd;
 854
 855        if (list_empty(&qh->qtd_list))
 856                qtd = qh->dummy;
 857        else {
 858                qtd = list_entry(qh->qtd_list.next,
 859                                struct ehci_qtd, qtd_list);
 860                /* first qtd may already be partially processed */
 861                if (cpu_to_le32(qtd->qtd_dma) == qh->hw_current)
 862                        qtd = NULL;
 863        }
 864
 865        if (qtd)
 866                qh_update(oxu, qh, qtd);
 867}
 868
 869static void qtd_copy_status(struct oxu_hcd *oxu, struct urb *urb,
 870                                size_t length, u32 token)
 871{
 872        /* count IN/OUT bytes, not SETUP (even short packets) */
 873        if (likely(QTD_PID(token) != 2))
 874                urb->actual_length += length - QTD_LENGTH(token);
 875
 876        /* don't modify error codes */
 877        if (unlikely(urb->status != -EINPROGRESS))
 878                return;
 879
 880        /* force cleanup after short read; not always an error */
 881        if (unlikely(IS_SHORT_READ(token)))
 882                urb->status = -EREMOTEIO;
 883
 884        /* serious "can't proceed" faults reported by the hardware */
 885        if (token & QTD_STS_HALT) {
 886                if (token & QTD_STS_BABBLE) {
 887                        /* FIXME "must" disable babbling device's port too */
 888                        urb->status = -EOVERFLOW;
 889                } else if (token & QTD_STS_MMF) {
 890                        /* fs/ls interrupt xfer missed the complete-split */
 891                        urb->status = -EPROTO;
 892                } else if (token & QTD_STS_DBE) {
 893                        urb->status = (QTD_PID(token) == 1) /* IN ? */
 894                                ? -ENOSR  /* hc couldn't read data */
 895                                : -ECOMM; /* hc couldn't write data */
 896                } else if (token & QTD_STS_XACT) {
 897                        /* timeout, bad crc, wrong PID, etc; retried */
 898                        if (QTD_CERR(token))
 899                                urb->status = -EPIPE;
 900                        else {
 901                                oxu_dbg(oxu, "devpath %s ep%d%s 3strikes\n",
 902                                        urb->dev->devpath,
 903                                        usb_pipeendpoint(urb->pipe),
 904                                        usb_pipein(urb->pipe) ? "in" : "out");
 905                                urb->status = -EPROTO;
 906                        }
 907                /* CERR nonzero + no errors + halt --> stall */
 908                } else if (QTD_CERR(token))
 909                        urb->status = -EPIPE;
 910                else    /* unknown */
 911                        urb->status = -EPROTO;
 912
 913                oxu_vdbg(oxu, "dev%d ep%d%s qtd token %08x --> status %d\n",
 914                        usb_pipedevice(urb->pipe),
 915                        usb_pipeendpoint(urb->pipe),
 916                        usb_pipein(urb->pipe) ? "in" : "out",
 917                        token, urb->status);
 918        }
 919}
 920
 921static void ehci_urb_done(struct oxu_hcd *oxu, struct urb *urb)
 922__releases(oxu->lock)
 923__acquires(oxu->lock)
 924{
 925        if (likely(urb->hcpriv != NULL)) {
 926                struct ehci_qh  *qh = (struct ehci_qh *) urb->hcpriv;
 927
 928                /* S-mask in a QH means it's an interrupt urb */
 929                if ((qh->hw_info2 & cpu_to_le32(QH_SMASK)) != 0) {
 930
 931                        /* ... update hc-wide periodic stats (for usbfs) */
 932                        oxu_to_hcd(oxu)->self.bandwidth_int_reqs--;
 933                }
 934                qh_put(qh);
 935        }
 936
 937        urb->hcpriv = NULL;
 938        switch (urb->status) {
 939        case -EINPROGRESS:              /* success */
 940                urb->status = 0;
 941        default:                        /* fault */
 942                break;
 943        case -EREMOTEIO:                /* fault or normal */
 944                if (!(urb->transfer_flags & URB_SHORT_NOT_OK))
 945                        urb->status = 0;
 946                break;
 947        case -ECONNRESET:               /* canceled */
 948        case -ENOENT:
 949                break;
 950        }
 951
 952#ifdef OXU_URB_TRACE
 953        oxu_dbg(oxu, "%s %s urb %p ep%d%s status %d len %d/%d\n",
 954                __func__, urb->dev->devpath, urb,
 955                usb_pipeendpoint(urb->pipe),
 956                usb_pipein(urb->pipe) ? "in" : "out",
 957                urb->status,
 958                urb->actual_length, urb->transfer_buffer_length);
 959#endif
 960
 961        /* complete() can reenter this HCD */
 962        spin_unlock(&oxu->lock);
 963        usb_hcd_giveback_urb(oxu_to_hcd(oxu), urb, urb->status);
 964        spin_lock(&oxu->lock);
 965}
 966
 967static void start_unlink_async(struct oxu_hcd *oxu, struct ehci_qh *qh);
 968static void unlink_async(struct oxu_hcd *oxu, struct ehci_qh *qh);
 969
 970static void intr_deschedule(struct oxu_hcd *oxu, struct ehci_qh *qh);
 971static int qh_schedule(struct oxu_hcd *oxu, struct ehci_qh *qh);
 972
 973#define HALT_BIT cpu_to_le32(QTD_STS_HALT)
 974
 975/* Process and free completed qtds for a qh, returning URBs to drivers.
 976 * Chases up to qh->hw_current.  Returns number of completions called,
 977 * indicating how much "real" work we did.
 978 */
 979static unsigned qh_completions(struct oxu_hcd *oxu, struct ehci_qh *qh)
 980{
 981        struct ehci_qtd *last = NULL, *end = qh->dummy;
 982        struct list_head *entry, *tmp;
 983        int stopped;
 984        unsigned count = 0;
 985        int do_status = 0;
 986        u8 state;
 987        struct oxu_murb *murb = NULL;
 988
 989        if (unlikely(list_empty(&qh->qtd_list)))
 990                return count;
 991
 992        /* completions (or tasks on other cpus) must never clobber HALT
 993         * till we've gone through and cleaned everything up, even when
 994         * they add urbs to this qh's queue or mark them for unlinking.
 995         *
 996         * NOTE:  unlinking expects to be done in queue order.
 997         */
 998        state = qh->qh_state;
 999        qh->qh_state = QH_STATE_COMPLETING;
1000        stopped = (state == QH_STATE_IDLE);
1001
1002        /* remove de-activated QTDs from front of queue.
1003         * after faults (including short reads), cleanup this urb
1004         * then let the queue advance.
1005         * if queue is stopped, handles unlinks.
1006         */
1007        list_for_each_safe(entry, tmp, &qh->qtd_list) {
1008                struct ehci_qtd *qtd;
1009                struct urb *urb;
1010                u32 token = 0;
1011
1012                qtd = list_entry(entry, struct ehci_qtd, qtd_list);
1013                urb = qtd->urb;
1014
1015                /* Clean up any state from previous QTD ...*/
1016                if (last) {
1017                        if (likely(last->urb != urb)) {
1018                                if (last->urb->complete == NULL) {
1019                                        murb = (struct oxu_murb *) last->urb;
1020                                        last->urb = murb->main;
1021                                        if (murb->last) {
1022                                                ehci_urb_done(oxu, last->urb);
1023                                                count++;
1024                                        }
1025                                        oxu_murb_free(oxu, murb);
1026                                } else {
1027                                        ehci_urb_done(oxu, last->urb);
1028                                        count++;
1029                                }
1030                        }
1031                        oxu_qtd_free(oxu, last);
1032                        last = NULL;
1033                }
1034
1035                /* ignore urbs submitted during completions we reported */
1036                if (qtd == end)
1037                        break;
1038
1039                /* hardware copies qtd out of qh overlay */
1040                rmb();
1041                token = le32_to_cpu(qtd->hw_token);
1042
1043                /* always clean up qtds the hc de-activated */
1044                if ((token & QTD_STS_ACTIVE) == 0) {
1045
1046                        if ((token & QTD_STS_HALT) != 0) {
1047                                stopped = 1;
1048
1049                        /* magic dummy for some short reads; qh won't advance.
1050                         * that silicon quirk can kick in with this dummy too.
1051                         */
1052                        } else if (IS_SHORT_READ(token) &&
1053                                        !(qtd->hw_alt_next & EHCI_LIST_END)) {
1054                                stopped = 1;
1055                                goto halt;
1056                        }
1057
1058                /* stop scanning when we reach qtds the hc is using */
1059                } else if (likely(!stopped &&
1060                                HC_IS_RUNNING(oxu_to_hcd(oxu)->state))) {
1061                        break;
1062
1063                } else {
1064                        stopped = 1;
1065
1066                        if (unlikely(!HC_IS_RUNNING(oxu_to_hcd(oxu)->state)))
1067                                urb->status = -ESHUTDOWN;
1068
1069                        /* ignore active urbs unless some previous qtd
1070                         * for the urb faulted (including short read) or
1071                         * its urb was canceled.  we may patch qh or qtds.
1072                         */
1073                        if (likely(urb->status == -EINPROGRESS))
1074                                continue;
1075
1076                        /* issue status after short control reads */
1077                        if (unlikely(do_status != 0)
1078                                        && QTD_PID(token) == 0 /* OUT */) {
1079                                do_status = 0;
1080                                continue;
1081                        }
1082
1083                        /* token in overlay may be most current */
1084                        if (state == QH_STATE_IDLE
1085                                        && cpu_to_le32(qtd->qtd_dma)
1086                                                == qh->hw_current)
1087                                token = le32_to_cpu(qh->hw_token);
1088
1089                        /* force halt for unlinked or blocked qh, so we'll
1090                         * patch the qh later and so that completions can't
1091                         * activate it while we "know" it's stopped.
1092                         */
1093                        if ((HALT_BIT & qh->hw_token) == 0) {
1094halt:
1095                                qh->hw_token |= HALT_BIT;
1096                                wmb();
1097                        }
1098                }
1099
1100                /* Remove it from the queue */
1101                qtd_copy_status(oxu, urb->complete ?
1102                                        urb : ((struct oxu_murb *) urb)->main,
1103                                qtd->length, token);
1104                if ((usb_pipein(qtd->urb->pipe)) &&
1105                                (NULL != qtd->transfer_buffer))
1106                        memcpy(qtd->transfer_buffer, qtd->buffer, qtd->length);
1107                do_status = (urb->status == -EREMOTEIO)
1108                                && usb_pipecontrol(urb->pipe);
1109
1110                if (stopped && qtd->qtd_list.prev != &qh->qtd_list) {
1111                        last = list_entry(qtd->qtd_list.prev,
1112                                        struct ehci_qtd, qtd_list);
1113                        last->hw_next = qtd->hw_next;
1114                }
1115                list_del(&qtd->qtd_list);
1116                last = qtd;
1117        }
1118
1119        /* last urb's completion might still need calling */
1120        if (likely(last != NULL)) {
1121                if (last->urb->complete == NULL) {
1122                        murb = (struct oxu_murb *) last->urb;
1123                        last->urb = murb->main;
1124                        if (murb->last) {
1125                                ehci_urb_done(oxu, last->urb);
1126                                count++;
1127                        }
1128                        oxu_murb_free(oxu, murb);
1129                } else {
1130                        ehci_urb_done(oxu, last->urb);
1131                        count++;
1132                }
1133                oxu_qtd_free(oxu, last);
1134        }
1135
1136        /* restore original state; caller must unlink or relink */
1137        qh->qh_state = state;
1138
1139        /* be sure the hardware's done with the qh before refreshing
1140         * it after fault cleanup, or recovering from silicon wrongly
1141         * overlaying the dummy qtd (which reduces DMA chatter).
1142         */
1143        if (stopped != 0 || qh->hw_qtd_next == EHCI_LIST_END) {
1144                switch (state) {
1145                case QH_STATE_IDLE:
1146                        qh_refresh(oxu, qh);
1147                        break;
1148                case QH_STATE_LINKED:
1149                        /* should be rare for periodic transfers,
1150                         * except maybe high bandwidth ...
1151                         */
1152                        if ((cpu_to_le32(QH_SMASK)
1153                                        & qh->hw_info2) != 0) {
1154                                intr_deschedule(oxu, qh);
1155                                (void) qh_schedule(oxu, qh);
1156                        } else
1157                                unlink_async(oxu, qh);
1158                        break;
1159                /* otherwise, unlink already started */
1160                }
1161        }
1162
1163        return count;
1164}
1165
1166/* High bandwidth multiplier, as encoded in highspeed endpoint descriptors */
1167#define hb_mult(wMaxPacketSize)         (1 + (((wMaxPacketSize) >> 11) & 0x03))
1168/* ... and packet size, for any kind of endpoint descriptor */
1169#define max_packet(wMaxPacketSize)      ((wMaxPacketSize) & 0x07ff)
1170
1171/* Reverse of qh_urb_transaction: free a list of TDs.
1172 * used for cleanup after errors, before HC sees an URB's TDs.
1173 */
1174static void qtd_list_free(struct oxu_hcd *oxu,
1175                                struct urb *urb, struct list_head *qtd_list)
1176{
1177        struct list_head *entry, *temp;
1178
1179        list_for_each_safe(entry, temp, qtd_list) {
1180                struct ehci_qtd *qtd;
1181
1182                qtd = list_entry(entry, struct ehci_qtd, qtd_list);
1183                list_del(&qtd->qtd_list);
1184                oxu_qtd_free(oxu, qtd);
1185        }
1186}
1187
1188/* Create a list of filled qtds for this URB; won't link into qh.
1189 */
1190static struct list_head *qh_urb_transaction(struct oxu_hcd *oxu,
1191                                                struct urb *urb,
1192                                                struct list_head *head,
1193                                                gfp_t flags)
1194{
1195        struct ehci_qtd *qtd, *qtd_prev;
1196        dma_addr_t buf;
1197        int len, maxpacket;
1198        int is_input;
1199        u32 token;
1200        void *transfer_buf = NULL;
1201        int ret;
1202
1203        /*
1204         * URBs map to sequences of QTDs: one logical transaction
1205         */
1206        qtd = ehci_qtd_alloc(oxu);
1207        if (unlikely(!qtd))
1208                return NULL;
1209        list_add_tail(&qtd->qtd_list, head);
1210        qtd->urb = urb;
1211
1212        token = QTD_STS_ACTIVE;
1213        token |= (EHCI_TUNE_CERR << 10);
1214        /* for split transactions, SplitXState initialized to zero */
1215
1216        len = urb->transfer_buffer_length;
1217        is_input = usb_pipein(urb->pipe);
1218        if (!urb->transfer_buffer && urb->transfer_buffer_length && is_input)
1219                urb->transfer_buffer = phys_to_virt(urb->transfer_dma);
1220
1221        if (usb_pipecontrol(urb->pipe)) {
1222                /* SETUP pid */
1223                ret = oxu_buf_alloc(oxu, qtd, sizeof(struct usb_ctrlrequest));
1224                if (ret)
1225                        goto cleanup;
1226
1227                qtd_fill(qtd, qtd->buffer_dma, sizeof(struct usb_ctrlrequest),
1228                                token | (2 /* "setup" */ << 8), 8);
1229                memcpy(qtd->buffer, qtd->urb->setup_packet,
1230                                sizeof(struct usb_ctrlrequest));
1231
1232                /* ... and always at least one more pid */
1233                token ^= QTD_TOGGLE;
1234                qtd_prev = qtd;
1235                qtd = ehci_qtd_alloc(oxu);
1236                if (unlikely(!qtd))
1237                        goto cleanup;
1238                qtd->urb = urb;
1239                qtd_prev->hw_next = QTD_NEXT(qtd->qtd_dma);
1240                list_add_tail(&qtd->qtd_list, head);
1241
1242                /* for zero length DATA stages, STATUS is always IN */
1243                if (len == 0)
1244                        token |= (1 /* "in" */ << 8);
1245        }
1246
1247        /*
1248         * Data transfer stage: buffer setup
1249         */
1250
1251        ret = oxu_buf_alloc(oxu, qtd, len);
1252        if (ret)
1253                goto cleanup;
1254
1255        buf = qtd->buffer_dma;
1256        transfer_buf = urb->transfer_buffer;
1257
1258        if (!is_input)
1259                memcpy(qtd->buffer, qtd->urb->transfer_buffer, len);
1260
1261        if (is_input)
1262                token |= (1 /* "in" */ << 8);
1263        /* else it's already initted to "out" pid (0 << 8) */
1264
1265        maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input));
1266
1267        /*
1268         * buffer gets wrapped in one or more qtds;
1269         * last one may be "short" (including zero len)
1270         * and may serve as a control status ack
1271         */
1272        for (;;) {
1273                int this_qtd_len;
1274
1275                this_qtd_len = qtd_fill(qtd, buf, len, token, maxpacket);
1276                qtd->transfer_buffer = transfer_buf;
1277                len -= this_qtd_len;
1278                buf += this_qtd_len;
1279                transfer_buf += this_qtd_len;
1280                if (is_input)
1281                        qtd->hw_alt_next = oxu->async->hw_alt_next;
1282
1283                /* qh makes control packets use qtd toggle; maybe switch it */
1284                if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0)
1285                        token ^= QTD_TOGGLE;
1286
1287                if (likely(len <= 0))
1288                        break;
1289
1290                qtd_prev = qtd;
1291                qtd = ehci_qtd_alloc(oxu);
1292                if (unlikely(!qtd))
1293                        goto cleanup;
1294                if (likely(len > 0)) {
1295                        ret = oxu_buf_alloc(oxu, qtd, len);
1296                        if (ret)
1297                                goto cleanup;
1298                }
1299                qtd->urb = urb;
1300                qtd_prev->hw_next = QTD_NEXT(qtd->qtd_dma);
1301                list_add_tail(&qtd->qtd_list, head);
1302        }
1303
1304        /* unless the bulk/interrupt caller wants a chance to clean
1305         * up after short reads, hc should advance qh past this urb
1306         */
1307        if (likely((urb->transfer_flags & URB_SHORT_NOT_OK) == 0
1308                                || usb_pipecontrol(urb->pipe)))
1309                qtd->hw_alt_next = EHCI_LIST_END;
1310
1311        /*
1312         * control requests may need a terminating data "status" ack;
1313         * bulk ones may need a terminating short packet (zero length).
1314         */
1315        if (likely(urb->transfer_buffer_length != 0)) {
1316                int     one_more = 0;
1317
1318                if (usb_pipecontrol(urb->pipe)) {
1319                        one_more = 1;
1320                        token ^= 0x0100;        /* "in" <--> "out"  */
1321                        token |= QTD_TOGGLE;    /* force DATA1 */
1322                } else if (usb_pipebulk(urb->pipe)
1323                                && (urb->transfer_flags & URB_ZERO_PACKET)
1324                                && !(urb->transfer_buffer_length % maxpacket)) {
1325                        one_more = 1;
1326                }
1327                if (one_more) {
1328                        qtd_prev = qtd;
1329                        qtd = ehci_qtd_alloc(oxu);
1330                        if (unlikely(!qtd))
1331                                goto cleanup;
1332                        qtd->urb = urb;
1333                        qtd_prev->hw_next = QTD_NEXT(qtd->qtd_dma);
1334                        list_add_tail(&qtd->qtd_list, head);
1335
1336                        /* never any data in such packets */
1337                        qtd_fill(qtd, 0, 0, token, 0);
1338                }
1339        }
1340
1341        /* by default, enable interrupt on urb completion */
1342                qtd->hw_token |= cpu_to_le32(QTD_IOC);
1343        return head;
1344
1345cleanup:
1346        qtd_list_free(oxu, urb, head);
1347        return NULL;
1348}
1349
1350/* Each QH holds a qtd list; a QH is used for everything except iso.
1351 *
1352 * For interrupt urbs, the scheduler must set the microframe scheduling
1353 * mask(s) each time the QH gets scheduled.  For highspeed, that's
1354 * just one microframe in the s-mask.  For split interrupt transactions
1355 * there are additional complications: c-mask, maybe FSTNs.
1356 */
1357static struct ehci_qh *qh_make(struct oxu_hcd *oxu,
1358                                struct urb *urb, gfp_t flags)
1359{
1360        struct ehci_qh *qh = oxu_qh_alloc(oxu);
1361        u32 info1 = 0, info2 = 0;
1362        int is_input, type;
1363        int maxp = 0;
1364
1365        if (!qh)
1366                return qh;
1367
1368        /*
1369         * init endpoint/device data for this QH
1370         */
1371        info1 |= usb_pipeendpoint(urb->pipe) << 8;
1372        info1 |= usb_pipedevice(urb->pipe) << 0;
1373
1374        is_input = usb_pipein(urb->pipe);
1375        type = usb_pipetype(urb->pipe);
1376        maxp = usb_maxpacket(urb->dev, urb->pipe, !is_input);
1377
1378        /* Compute interrupt scheduling parameters just once, and save.
1379         * - allowing for high bandwidth, how many nsec/uframe are used?
1380         * - split transactions need a second CSPLIT uframe; same question
1381         * - splits also need a schedule gap (for full/low speed I/O)
1382         * - qh has a polling interval
1383         *
1384         * For control/bulk requests, the HC or TT handles these.
1385         */
1386        if (type == PIPE_INTERRUPT) {
1387                qh->usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH,
1388                                                                is_input, 0,
1389                                hb_mult(maxp) * max_packet(maxp)));
1390                qh->start = NO_FRAME;
1391
1392                if (urb->dev->speed == USB_SPEED_HIGH) {
1393                        qh->c_usecs = 0;
1394                        qh->gap_uf = 0;
1395
1396                        qh->period = urb->interval >> 3;
1397                        if (qh->period == 0 && urb->interval != 1) {
1398                                /* NOTE interval 2 or 4 uframes could work.
1399                                 * But interval 1 scheduling is simpler, and
1400                                 * includes high bandwidth.
1401                                 */
1402                                oxu_dbg(oxu, "intr period %d uframes, NYET!\n",
1403                                        urb->interval);
1404                                goto done;
1405                        }
1406                } else {
1407                        struct usb_tt   *tt = urb->dev->tt;
1408                        int             think_time;
1409
1410                        /* gap is f(FS/LS transfer times) */
1411                        qh->gap_uf = 1 + usb_calc_bus_time(urb->dev->speed,
1412                                        is_input, 0, maxp) / (125 * 1000);
1413
1414                        /* FIXME this just approximates SPLIT/CSPLIT times */
1415                        if (is_input) {         /* SPLIT, gap, CSPLIT+DATA */
1416                                qh->c_usecs = qh->usecs + HS_USECS(0);
1417                                qh->usecs = HS_USECS(1);
1418                        } else {                /* SPLIT+DATA, gap, CSPLIT */
1419                                qh->usecs += HS_USECS(1);
1420                                qh->c_usecs = HS_USECS(0);
1421                        }
1422
1423                        think_time = tt ? tt->think_time : 0;
1424                        qh->tt_usecs = NS_TO_US(think_time +
1425                                        usb_calc_bus_time(urb->dev->speed,
1426                                        is_input, 0, max_packet(maxp)));
1427                        qh->period = urb->interval;
1428                }
1429        }
1430
1431        /* support for tt scheduling, and access to toggles */
1432        qh->dev = urb->dev;
1433
1434        /* using TT? */
1435        switch (urb->dev->speed) {
1436        case USB_SPEED_LOW:
1437                info1 |= (1 << 12);     /* EPS "low" */
1438                /* FALL THROUGH */
1439
1440        case USB_SPEED_FULL:
1441                /* EPS 0 means "full" */
1442                if (type != PIPE_INTERRUPT)
1443                        info1 |= (EHCI_TUNE_RL_TT << 28);
1444                if (type == PIPE_CONTROL) {
1445                        info1 |= (1 << 27);     /* for TT */
1446                        info1 |= 1 << 14;       /* toggle from qtd */
1447                }
1448                info1 |= maxp << 16;
1449
1450                info2 |= (EHCI_TUNE_MULT_TT << 30);
1451                info2 |= urb->dev->ttport << 23;
1452
1453                /* NOTE:  if (PIPE_INTERRUPT) { scheduler sets c-mask } */
1454
1455                break;
1456
1457        case USB_SPEED_HIGH:            /* no TT involved */
1458                info1 |= (2 << 12);     /* EPS "high" */
1459                if (type == PIPE_CONTROL) {
1460                        info1 |= (EHCI_TUNE_RL_HS << 28);
1461                        info1 |= 64 << 16;      /* usb2 fixed maxpacket */
1462                        info1 |= 1 << 14;       /* toggle from qtd */
1463                        info2 |= (EHCI_TUNE_MULT_HS << 30);
1464                } else if (type == PIPE_BULK) {
1465                        info1 |= (EHCI_TUNE_RL_HS << 28);
1466                        info1 |= 512 << 16;     /* usb2 fixed maxpacket */
1467                        info2 |= (EHCI_TUNE_MULT_HS << 30);
1468                } else {                /* PIPE_INTERRUPT */
1469                        info1 |= max_packet(maxp) << 16;
1470                        info2 |= hb_mult(maxp) << 30;
1471                }
1472                break;
1473        default:
1474                oxu_dbg(oxu, "bogus dev %p speed %d\n", urb->dev, urb->dev->speed);
1475done:
1476                qh_put(qh);
1477                return NULL;
1478        }
1479
1480        /* NOTE:  if (PIPE_INTERRUPT) { scheduler sets s-mask } */
1481
1482        /* init as live, toggle clear, advance to dummy */
1483        qh->qh_state = QH_STATE_IDLE;
1484        qh->hw_info1 = cpu_to_le32(info1);
1485        qh->hw_info2 = cpu_to_le32(info2);
1486        usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), !is_input, 1);
1487        qh_refresh(oxu, qh);
1488        return qh;
1489}
1490
1491/* Move qh (and its qtds) onto async queue; maybe enable queue.
1492 */
1493static void qh_link_async(struct oxu_hcd *oxu, struct ehci_qh *qh)
1494{
1495        __le32 dma = QH_NEXT(qh->qh_dma);
1496        struct ehci_qh *head;
1497
1498        /* (re)start the async schedule? */
1499        head = oxu->async;
1500        timer_action_done(oxu, TIMER_ASYNC_OFF);
1501        if (!head->qh_next.qh) {
1502                u32     cmd = readl(&oxu->regs->command);
1503
1504                if (!(cmd & CMD_ASE)) {
1505                        /* in case a clear of CMD_ASE didn't take yet */
1506                        (void)handshake(oxu, &oxu->regs->status,
1507                                        STS_ASS, 0, 150);
1508                        cmd |= CMD_ASE | CMD_RUN;
1509                        writel(cmd, &oxu->regs->command);
1510                        oxu_to_hcd(oxu)->state = HC_STATE_RUNNING;
1511                        /* posted write need not be known to HC yet ... */
1512                }
1513        }
1514
1515        /* clear halt and/or toggle; and maybe recover from silicon quirk */
1516        if (qh->qh_state == QH_STATE_IDLE)
1517                qh_refresh(oxu, qh);
1518
1519        /* splice right after start */
1520        qh->qh_next = head->qh_next;
1521        qh->hw_next = head->hw_next;
1522        wmb();
1523
1524        head->qh_next.qh = qh;
1525        head->hw_next = dma;
1526
1527        qh->qh_state = QH_STATE_LINKED;
1528        /* qtd completions reported later by interrupt */
1529}
1530
1531#define QH_ADDR_MASK    cpu_to_le32(0x7f)
1532
1533/*
1534 * For control/bulk/interrupt, return QH with these TDs appended.
1535 * Allocates and initializes the QH if necessary.
1536 * Returns null if it can't allocate a QH it needs to.
1537 * If the QH has TDs (urbs) already, that's great.
1538 */
1539static struct ehci_qh *qh_append_tds(struct oxu_hcd *oxu,
1540                                struct urb *urb, struct list_head *qtd_list,
1541                                int epnum, void **ptr)
1542{
1543        struct ehci_qh *qh = NULL;
1544
1545        qh = (struct ehci_qh *) *ptr;
1546        if (unlikely(qh == NULL)) {
1547                /* can't sleep here, we have oxu->lock... */
1548                qh = qh_make(oxu, urb, GFP_ATOMIC);
1549                *ptr = qh;
1550        }
1551        if (likely(qh != NULL)) {
1552                struct ehci_qtd *qtd;
1553
1554                if (unlikely(list_empty(qtd_list)))
1555                        qtd = NULL;
1556                else
1557                        qtd = list_entry(qtd_list->next, struct ehci_qtd,
1558                                        qtd_list);
1559
1560                /* control qh may need patching ... */
1561                if (unlikely(epnum == 0)) {
1562
1563                        /* usb_reset_device() briefly reverts to address 0 */
1564                        if (usb_pipedevice(urb->pipe) == 0)
1565                                qh->hw_info1 &= ~QH_ADDR_MASK;
1566                }
1567
1568                /* just one way to queue requests: swap with the dummy qtd.
1569                 * only hc or qh_refresh() ever modify the overlay.
1570                 */
1571                if (likely(qtd != NULL)) {
1572                        struct ehci_qtd *dummy;
1573                        dma_addr_t dma;
1574                        __le32 token;
1575
1576                        /* to avoid racing the HC, use the dummy td instead of
1577                         * the first td of our list (becomes new dummy).  both
1578                         * tds stay deactivated until we're done, when the
1579                         * HC is allowed to fetch the old dummy (4.10.2).
1580                         */
1581                        token = qtd->hw_token;
1582                        qtd->hw_token = HALT_BIT;
1583                        wmb();
1584                        dummy = qh->dummy;
1585
1586                        dma = dummy->qtd_dma;
1587                        *dummy = *qtd;
1588                        dummy->qtd_dma = dma;
1589
1590                        list_del(&qtd->qtd_list);
1591                        list_add(&dummy->qtd_list, qtd_list);
1592                        list_splice(qtd_list, qh->qtd_list.prev);
1593
1594                        ehci_qtd_init(qtd, qtd->qtd_dma);
1595                        qh->dummy = qtd;
1596
1597                        /* hc must see the new dummy at list end */
1598                        dma = qtd->qtd_dma;
1599                        qtd = list_entry(qh->qtd_list.prev,
1600                                        struct ehci_qtd, qtd_list);
1601                        qtd->hw_next = QTD_NEXT(dma);
1602
1603                        /* let the hc process these next qtds */
1604                        dummy->hw_token = (token & ~(0x80));
1605                        wmb();
1606                        dummy->hw_token = token;
1607
1608                        urb->hcpriv = qh_get(qh);
1609                }
1610        }
1611        return qh;
1612}
1613
1614static int submit_async(struct oxu_hcd  *oxu, struct urb *urb,
1615                        struct list_head *qtd_list, gfp_t mem_flags)
1616{
1617        struct ehci_qtd *qtd;
1618        int epnum;
1619        unsigned long flags;
1620        struct ehci_qh *qh = NULL;
1621        int rc = 0;
1622
1623        qtd = list_entry(qtd_list->next, struct ehci_qtd, qtd_list);
1624        epnum = urb->ep->desc.bEndpointAddress;
1625
1626#ifdef OXU_URB_TRACE
1627        oxu_dbg(oxu, "%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n",
1628                __func__, urb->dev->devpath, urb,
1629                epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out",
1630                urb->transfer_buffer_length,
1631                qtd, urb->ep->hcpriv);
1632#endif
1633
1634        spin_lock_irqsave(&oxu->lock, flags);
1635        if (unlikely(!HCD_HW_ACCESSIBLE(oxu_to_hcd(oxu)))) {
1636                rc = -ESHUTDOWN;
1637                goto done;
1638        }
1639
1640        qh = qh_append_tds(oxu, urb, qtd_list, epnum, &urb->ep->hcpriv);
1641        if (unlikely(qh == NULL)) {
1642                rc = -ENOMEM;
1643                goto done;
1644        }
1645
1646        /* Control/bulk operations through TTs don't need scheduling,
1647         * the HC and TT handle it when the TT has a buffer ready.
1648         */
1649        if (likely(qh->qh_state == QH_STATE_IDLE))
1650                qh_link_async(oxu, qh_get(qh));
1651done:
1652        spin_unlock_irqrestore(&oxu->lock, flags);
1653        if (unlikely(qh == NULL))
1654                qtd_list_free(oxu, urb, qtd_list);
1655        return rc;
1656}
1657
1658/* The async qh for the qtds being reclaimed are now unlinked from the HC */
1659
1660static void end_unlink_async(struct oxu_hcd *oxu)
1661{
1662        struct ehci_qh *qh = oxu->reclaim;
1663        struct ehci_qh *next;
1664
1665        timer_action_done(oxu, TIMER_IAA_WATCHDOG);
1666
1667        qh->qh_state = QH_STATE_IDLE;
1668        qh->qh_next.qh = NULL;
1669        qh_put(qh);                     /* refcount from reclaim */
1670
1671        /* other unlink(s) may be pending (in QH_STATE_UNLINK_WAIT) */
1672        next = qh->reclaim;
1673        oxu->reclaim = next;
1674        oxu->reclaim_ready = 0;
1675        qh->reclaim = NULL;
1676
1677        qh_completions(oxu, qh);
1678
1679        if (!list_empty(&qh->qtd_list)
1680                        && HC_IS_RUNNING(oxu_to_hcd(oxu)->state))
1681                qh_link_async(oxu, qh);
1682        else {
1683                qh_put(qh);             /* refcount from async list */
1684
1685                /* it's not free to turn the async schedule on/off; leave it
1686                 * active but idle for a while once it empties.
1687                 */
1688                if (HC_IS_RUNNING(oxu_to_hcd(oxu)->state)
1689                                && oxu->async->qh_next.qh == NULL)
1690                        timer_action(oxu, TIMER_ASYNC_OFF);
1691        }
1692
1693        if (next) {
1694                oxu->reclaim = NULL;
1695                start_unlink_async(oxu, next);
1696        }
1697}
1698
1699/* makes sure the async qh will become idle */
1700/* caller must own oxu->lock */
1701
1702static void start_unlink_async(struct oxu_hcd *oxu, struct ehci_qh *qh)
1703{
1704        int cmd = readl(&oxu->regs->command);
1705        struct ehci_qh *prev;
1706
1707#ifdef DEBUG
1708        assert_spin_locked(&oxu->lock);
1709        if (oxu->reclaim || (qh->qh_state != QH_STATE_LINKED
1710                                && qh->qh_state != QH_STATE_UNLINK_WAIT))
1711                BUG();
1712#endif
1713
1714        /* stop async schedule right now? */
1715        if (unlikely(qh == oxu->async)) {
1716                /* can't get here without STS_ASS set */
1717                if (oxu_to_hcd(oxu)->state != HC_STATE_HALT
1718                                && !oxu->reclaim) {
1719                        /* ... and CMD_IAAD clear */
1720                        writel(cmd & ~CMD_ASE, &oxu->regs->command);
1721                        wmb();
1722                        /* handshake later, if we need to */
1723                        timer_action_done(oxu, TIMER_ASYNC_OFF);
1724                }
1725                return;
1726        }
1727
1728        qh->qh_state = QH_STATE_UNLINK;
1729        oxu->reclaim = qh = qh_get(qh);
1730
1731        prev = oxu->async;
1732        while (prev->qh_next.qh != qh)
1733                prev = prev->qh_next.qh;
1734
1735        prev->hw_next = qh->hw_next;
1736        prev->qh_next = qh->qh_next;
1737        wmb();
1738
1739        if (unlikely(oxu_to_hcd(oxu)->state == HC_STATE_HALT)) {
1740                /* if (unlikely(qh->reclaim != 0))
1741                 *      this will recurse, probably not much
1742                 */
1743                end_unlink_async(oxu);
1744                return;
1745        }
1746
1747        oxu->reclaim_ready = 0;
1748        cmd |= CMD_IAAD;
1749        writel(cmd, &oxu->regs->command);
1750        (void) readl(&oxu->regs->command);
1751        timer_action(oxu, TIMER_IAA_WATCHDOG);
1752}
1753
1754static void scan_async(struct oxu_hcd *oxu)
1755{
1756        struct ehci_qh *qh;
1757        enum ehci_timer_action action = TIMER_IO_WATCHDOG;
1758
1759        if (!++(oxu->stamp))
1760                oxu->stamp++;
1761        timer_action_done(oxu, TIMER_ASYNC_SHRINK);
1762rescan:
1763        qh = oxu->async->qh_next.qh;
1764        if (likely(qh != NULL)) {
1765                do {
1766                        /* clean any finished work for this qh */
1767                        if (!list_empty(&qh->qtd_list)
1768                                        && qh->stamp != oxu->stamp) {
1769                                int temp;
1770
1771                                /* unlinks could happen here; completion
1772                                 * reporting drops the lock.  rescan using
1773                                 * the latest schedule, but don't rescan
1774                                 * qhs we already finished (no looping).
1775                                 */
1776                                qh = qh_get(qh);
1777                                qh->stamp = oxu->stamp;
1778                                temp = qh_completions(oxu, qh);
1779                                qh_put(qh);
1780                                if (temp != 0)
1781                                        goto rescan;
1782                        }
1783
1784                        /* unlink idle entries, reducing HC PCI usage as well
1785                         * as HCD schedule-scanning costs.  delay for any qh
1786                         * we just scanned, there's a not-unusual case that it
1787                         * doesn't stay idle for long.
1788                         * (plus, avoids some kind of re-activation race.)
1789                         */
1790                        if (list_empty(&qh->qtd_list)) {
1791                                if (qh->stamp == oxu->stamp)
1792                                        action = TIMER_ASYNC_SHRINK;
1793                                else if (!oxu->reclaim
1794                                            && qh->qh_state == QH_STATE_LINKED)
1795                                        start_unlink_async(oxu, qh);
1796                        }
1797
1798                        qh = qh->qh_next.qh;
1799                } while (qh);
1800        }
1801        if (action == TIMER_ASYNC_SHRINK)
1802                timer_action(oxu, TIMER_ASYNC_SHRINK);
1803}
1804
1805/*
1806 * periodic_next_shadow - return "next" pointer on shadow list
1807 * @periodic: host pointer to qh/itd/sitd
1808 * @tag: hardware tag for type of this record
1809 */
1810static union ehci_shadow *periodic_next_shadow(union ehci_shadow *periodic,
1811                                                __le32 tag)
1812{
1813        switch (tag) {
1814        default:
1815        case Q_TYPE_QH:
1816                return &periodic->qh->qh_next;
1817        }
1818}
1819
1820/* caller must hold oxu->lock */
1821static void periodic_unlink(struct oxu_hcd *oxu, unsigned frame, void *ptr)
1822{
1823        union ehci_shadow *prev_p = &oxu->pshadow[frame];
1824        __le32 *hw_p = &oxu->periodic[frame];
1825        union ehci_shadow here = *prev_p;
1826
1827        /* find predecessor of "ptr"; hw and shadow lists are in sync */
1828        while (here.ptr && here.ptr != ptr) {
1829                prev_p = periodic_next_shadow(prev_p, Q_NEXT_TYPE(*hw_p));
1830                hw_p = here.hw_next;
1831                here = *prev_p;
1832        }
1833        /* an interrupt entry (at list end) could have been shared */
1834        if (!here.ptr)
1835                return;
1836
1837        /* update shadow and hardware lists ... the old "next" pointers
1838         * from ptr may still be in use, the caller updates them.
1839         */
1840        *prev_p = *periodic_next_shadow(&here, Q_NEXT_TYPE(*hw_p));
1841        *hw_p = *here.hw_next;
1842}
1843
1844/* how many of the uframe's 125 usecs are allocated? */
1845static unsigned short periodic_usecs(struct oxu_hcd *oxu,
1846                                        unsigned frame, unsigned uframe)
1847{
1848        __le32 *hw_p = &oxu->periodic[frame];
1849        union ehci_shadow *q = &oxu->pshadow[frame];
1850        unsigned usecs = 0;
1851
1852        while (q->ptr) {
1853                switch (Q_NEXT_TYPE(*hw_p)) {
1854                case Q_TYPE_QH:
1855                default:
1856                        /* is it in the S-mask? */
1857                        if (q->qh->hw_info2 & cpu_to_le32(1 << uframe))
1858                                usecs += q->qh->usecs;
1859                        /* ... or C-mask? */
1860                        if (q->qh->hw_info2 & cpu_to_le32(1 << (8 + uframe)))
1861                                usecs += q->qh->c_usecs;
1862                        hw_p = &q->qh->hw_next;
1863                        q = &q->qh->qh_next;
1864                        break;
1865                }
1866        }
1867#ifdef DEBUG
1868        if (usecs > 100)
1869                oxu_err(oxu, "uframe %d sched overrun: %d usecs\n",
1870                                                frame * 8 + uframe, usecs);
1871#endif
1872        return usecs;
1873}
1874
1875static int enable_periodic(struct oxu_hcd *oxu)
1876{
1877        u32 cmd;
1878        int status;
1879
1880        /* did clearing PSE did take effect yet?
1881         * takes effect only at frame boundaries...
1882         */
1883        status = handshake(oxu, &oxu->regs->status, STS_PSS, 0, 9 * 125);
1884        if (status != 0) {
1885                oxu_to_hcd(oxu)->state = HC_STATE_HALT;
1886                usb_hc_died(oxu_to_hcd(oxu));
1887                return status;
1888        }
1889
1890        cmd = readl(&oxu->regs->command) | CMD_PSE;
1891        writel(cmd, &oxu->regs->command);
1892        /* posted write ... PSS happens later */
1893        oxu_to_hcd(oxu)->state = HC_STATE_RUNNING;
1894
1895        /* make sure ehci_work scans these */
1896        oxu->next_uframe = readl(&oxu->regs->frame_index)
1897                % (oxu->periodic_size << 3);
1898        return 0;
1899}
1900
1901static int disable_periodic(struct oxu_hcd *oxu)
1902{
1903        u32 cmd;
1904        int status;
1905
1906        /* did setting PSE not take effect yet?
1907         * takes effect only at frame boundaries...
1908         */
1909        status = handshake(oxu, &oxu->regs->status, STS_PSS, STS_PSS, 9 * 125);
1910        if (status != 0) {
1911                oxu_to_hcd(oxu)->state = HC_STATE_HALT;
1912                usb_hc_died(oxu_to_hcd(oxu));
1913                return status;
1914        }
1915
1916        cmd = readl(&oxu->regs->command) & ~CMD_PSE;
1917        writel(cmd, &oxu->regs->command);
1918        /* posted write ... */
1919
1920        oxu->next_uframe = -1;
1921        return 0;
1922}
1923
1924/* periodic schedule slots have iso tds (normal or split) first, then a
1925 * sparse tree for active interrupt transfers.
1926 *
1927 * this just links in a qh; caller guarantees uframe masks are set right.
1928 * no FSTN support (yet; oxu 0.96+)
1929 */
1930static int qh_link_periodic(struct oxu_hcd *oxu, struct ehci_qh *qh)
1931{
1932        unsigned i;
1933        unsigned period = qh->period;
1934
1935        dev_dbg(&qh->dev->dev,
1936                "link qh%d-%04x/%p start %d [%d/%d us]\n",
1937                period, le32_to_cpup(&qh->hw_info2) & (QH_CMASK | QH_SMASK),
1938                qh, qh->start, qh->usecs, qh->c_usecs);
1939
1940        /* high bandwidth, or otherwise every microframe */
1941        if (period == 0)
1942                period = 1;
1943
1944        for (i = qh->start; i < oxu->periodic_size; i += period) {
1945                union ehci_shadow       *prev = &oxu->pshadow[i];
1946                __le32                  *hw_p = &oxu->periodic[i];
1947                union ehci_shadow       here = *prev;
1948                __le32                  type = 0;
1949
1950                /* skip the iso nodes at list head */
1951                while (here.ptr) {
1952                        type = Q_NEXT_TYPE(*hw_p);
1953                        if (type == Q_TYPE_QH)
1954                                break;
1955                        prev = periodic_next_shadow(prev, type);
1956                        hw_p = &here.qh->hw_next;
1957                        here = *prev;
1958                }
1959
1960                /* sorting each branch by period (slow-->fast)
1961                 * enables sharing interior tree nodes
1962                 */
1963                while (here.ptr && qh != here.qh) {
1964                        if (qh->period > here.qh->period)
1965                                break;
1966                        prev = &here.qh->qh_next;
1967                        hw_p = &here.qh->hw_next;
1968                        here = *prev;
1969                }
1970                /* link in this qh, unless some earlier pass did that */
1971                if (qh != here.qh) {
1972                        qh->qh_next = here;
1973                        if (here.qh)
1974                                qh->hw_next = *hw_p;
1975                        wmb();
1976                        prev->qh = qh;
1977                        *hw_p = QH_NEXT(qh->qh_dma);
1978                }
1979        }
1980        qh->qh_state = QH_STATE_LINKED;
1981        qh_get(qh);
1982
1983        /* update per-qh bandwidth for usbfs */
1984        oxu_to_hcd(oxu)->self.bandwidth_allocated += qh->period
1985                ? ((qh->usecs + qh->c_usecs) / qh->period)
1986                : (qh->usecs * 8);
1987
1988        /* maybe enable periodic schedule processing */
1989        if (!oxu->periodic_sched++)
1990                return enable_periodic(oxu);
1991
1992        return 0;
1993}
1994
1995static void qh_unlink_periodic(struct oxu_hcd *oxu, struct ehci_qh *qh)
1996{
1997        unsigned i;
1998        unsigned period;
1999
2000        /* FIXME:
2001         *   IF this isn't high speed
2002         *   and this qh is active in the current uframe
2003         *   (and overlay token SplitXstate is false?)
2004         * THEN
2005         *   qh->hw_info1 |= cpu_to_le32(1 << 7 "ignore");
2006         */
2007
2008        /* high bandwidth, or otherwise part of every microframe */
2009        period = qh->period;
2010        if (period == 0)
2011                period = 1;
2012
2013        for (i = qh->start; i < oxu->periodic_size; i += period)
2014                periodic_unlink(oxu, i, qh);
2015
2016        /* update per-qh bandwidth for usbfs */
2017        oxu_to_hcd(oxu)->self.bandwidth_allocated -= qh->period
2018                ? ((qh->usecs + qh->c_usecs) / qh->period)
2019                : (qh->usecs * 8);
2020
2021        dev_dbg(&qh->dev->dev,
2022                "unlink qh%d-%04x/%p start %d [%d/%d us]\n",
2023                qh->period,
2024                le32_to_cpup(&qh->hw_info2) & (QH_CMASK | QH_SMASK),
2025                qh, qh->start, qh->usecs, qh->c_usecs);
2026
2027        /* qh->qh_next still "live" to HC */
2028        qh->qh_state = QH_STATE_UNLINK;
2029        qh->qh_next.ptr = NULL;
2030        qh_put(qh);
2031
2032        /* maybe turn off periodic schedule */
2033        oxu->periodic_sched--;
2034        if (!oxu->periodic_sched)
2035                (void) disable_periodic(oxu);
2036}
2037
2038static void intr_deschedule(struct oxu_hcd *oxu, struct ehci_qh *qh)
2039{
2040        unsigned wait;
2041
2042        qh_unlink_periodic(oxu, qh);
2043
2044        /* simple/paranoid:  always delay, expecting the HC needs to read
2045         * qh->hw_next or finish a writeback after SPLIT/CSPLIT ... and
2046         * expect khubd to clean up after any CSPLITs we won't issue.
2047         * active high speed queues may need bigger delays...
2048         */
2049        if (list_empty(&qh->qtd_list)
2050                || (cpu_to_le32(QH_CMASK) & qh->hw_info2) != 0)
2051                wait = 2;
2052        else
2053                wait = 55;      /* worst case: 3 * 1024 */
2054
2055        udelay(wait);
2056        qh->qh_state = QH_STATE_IDLE;
2057        qh->hw_next = EHCI_LIST_END;
2058        wmb();
2059}
2060
2061static int check_period(struct oxu_hcd *oxu,
2062                        unsigned frame, unsigned uframe,
2063                        unsigned period, unsigned usecs)
2064{
2065        int claimed;
2066
2067        /* complete split running into next frame?
2068         * given FSTN support, we could sometimes check...
2069         */
2070        if (uframe >= 8)
2071                return 0;
2072
2073        /*
2074         * 80% periodic == 100 usec/uframe available
2075         * convert "usecs we need" to "max already claimed"
2076         */
2077        usecs = 100 - usecs;
2078
2079        /* we "know" 2 and 4 uframe intervals were rejected; so
2080         * for period 0, check _every_ microframe in the schedule.
2081         */
2082        if (unlikely(period == 0)) {
2083                do {
2084                        for (uframe = 0; uframe < 7; uframe++) {
2085                                claimed = periodic_usecs(oxu, frame, uframe);
2086                                if (claimed > usecs)
2087                                        return 0;
2088                        }
2089                } while ((frame += 1) < oxu->periodic_size);
2090
2091        /* just check the specified uframe, at that period */
2092        } else {
2093                do {
2094                        claimed = periodic_usecs(oxu, frame, uframe);
2095                        if (claimed > usecs)
2096                                return 0;
2097                } while ((frame += period) < oxu->periodic_size);
2098        }
2099
2100        return 1;
2101}
2102
2103static int check_intr_schedule(struct oxu_hcd   *oxu,
2104                                unsigned frame, unsigned uframe,
2105                                const struct ehci_qh *qh, __le32 *c_maskp)
2106{
2107        int retval = -ENOSPC;
2108
2109        if (qh->c_usecs && uframe >= 6)         /* FSTN territory? */
2110                goto done;
2111
2112        if (!check_period(oxu, frame, uframe, qh->period, qh->usecs))
2113                goto done;
2114        if (!qh->c_usecs) {
2115                retval = 0;
2116                *c_maskp = 0;
2117                goto done;
2118        }
2119
2120done:
2121        return retval;
2122}
2123
2124/* "first fit" scheduling policy used the first time through,
2125 * or when the previous schedule slot can't be re-used.
2126 */
2127static int qh_schedule(struct oxu_hcd *oxu, struct ehci_qh *qh)
2128{
2129        int             status;
2130        unsigned        uframe;
2131        __le32          c_mask;
2132        unsigned        frame;          /* 0..(qh->period - 1), or NO_FRAME */
2133
2134        qh_refresh(oxu, qh);
2135        qh->hw_next = EHCI_LIST_END;
2136        frame = qh->start;
2137
2138        /* reuse the previous schedule slots, if we can */
2139        if (frame < qh->period) {
2140                uframe = ffs(le32_to_cpup(&qh->hw_info2) & QH_SMASK);
2141                status = check_intr_schedule(oxu, frame, --uframe,
2142                                qh, &c_mask);
2143        } else {
2144                uframe = 0;
2145                c_mask = 0;
2146                status = -ENOSPC;
2147        }
2148
2149        /* else scan the schedule to find a group of slots such that all
2150         * uframes have enough periodic bandwidth available.
2151         */
2152        if (status) {
2153                /* "normal" case, uframing flexible except with splits */
2154                if (qh->period) {
2155                        frame = qh->period - 1;
2156                        do {
2157                                for (uframe = 0; uframe < 8; uframe++) {
2158                                        status = check_intr_schedule(oxu,
2159                                                        frame, uframe, qh,
2160                                                        &c_mask);
2161                                        if (status == 0)
2162                                                break;
2163                                }
2164                        } while (status && frame--);
2165
2166                /* qh->period == 0 means every uframe */
2167                } else {
2168                        frame = 0;
2169                        status = check_intr_schedule(oxu, 0, 0, qh, &c_mask);
2170                }
2171                if (status)
2172                        goto done;
2173                qh->start = frame;
2174
2175                /* reset S-frame and (maybe) C-frame masks */
2176                qh->hw_info2 &= cpu_to_le32(~(QH_CMASK | QH_SMASK));
2177                qh->hw_info2 |= qh->period
2178                        ? cpu_to_le32(1 << uframe)
2179                        : cpu_to_le32(QH_SMASK);
2180                qh->hw_info2 |= c_mask;
2181        } else
2182                oxu_dbg(oxu, "reused qh %p schedule\n", qh);
2183
2184        /* stuff into the periodic schedule */
2185        status = qh_link_periodic(oxu, qh);
2186done:
2187        return status;
2188}
2189
2190static int intr_submit(struct oxu_hcd *oxu, struct urb *urb,
2191                        struct list_head *qtd_list, gfp_t mem_flags)
2192{
2193        unsigned epnum;
2194        unsigned long flags;
2195        struct ehci_qh *qh;
2196        int status = 0;
2197        struct list_head        empty;
2198
2199        /* get endpoint and transfer/schedule data */
2200        epnum = urb->ep->desc.bEndpointAddress;
2201
2202        spin_lock_irqsave(&oxu->lock, flags);
2203
2204        if (unlikely(!HCD_HW_ACCESSIBLE(oxu_to_hcd(oxu)))) {
2205                status = -ESHUTDOWN;
2206                goto done;
2207        }
2208
2209        /* get qh and force any scheduling errors */
2210        INIT_LIST_HEAD(&empty);
2211        qh = qh_append_tds(oxu, urb, &empty, epnum, &urb->ep->hcpriv);
2212        if (qh == NULL) {
2213                status = -ENOMEM;
2214                goto done;
2215        }
2216        if (qh->qh_state == QH_STATE_IDLE) {
2217                status = qh_schedule(oxu, qh);
2218                if (status != 0)
2219                        goto done;
2220        }
2221
2222        /* then queue the urb's tds to the qh */
2223        qh = qh_append_tds(oxu, urb, qtd_list, epnum, &urb->ep->hcpriv);
2224        BUG_ON(qh == NULL);
2225
2226        /* ... update usbfs periodic stats */
2227        oxu_to_hcd(oxu)->self.bandwidth_int_reqs++;
2228
2229done:
2230        spin_unlock_irqrestore(&oxu->lock, flags);
2231        if (status)
2232                qtd_list_free(oxu, urb, qtd_list);
2233
2234        return status;
2235}
2236
2237static inline int itd_submit(struct oxu_hcd *oxu, struct urb *urb,
2238                                                gfp_t mem_flags)
2239{
2240        oxu_dbg(oxu, "iso support is missing!\n");
2241        return -ENOSYS;
2242}
2243
2244static inline int sitd_submit(struct oxu_hcd *oxu, struct urb *urb,
2245                                                gfp_t mem_flags)
2246{
2247        oxu_dbg(oxu, "split iso support is missing!\n");
2248        return -ENOSYS;
2249}
2250
2251static void scan_periodic(struct oxu_hcd *oxu)
2252{
2253        unsigned frame, clock, now_uframe, mod;
2254        unsigned modified;
2255
2256        mod = oxu->periodic_size << 3;
2257
2258        /*
2259         * When running, scan from last scan point up to "now"
2260         * else clean up by scanning everything that's left.
2261         * Touches as few pages as possible:  cache-friendly.
2262         */
2263        now_uframe = oxu->next_uframe;
2264        if (HC_IS_RUNNING(oxu_to_hcd(oxu)->state))
2265                clock = readl(&oxu->regs->frame_index);
2266        else
2267                clock = now_uframe + mod - 1;
2268        clock %= mod;
2269
2270        for (;;) {
2271                union ehci_shadow       q, *q_p;
2272                __le32                  type, *hw_p;
2273                unsigned                uframes;
2274
2275                /* don't scan past the live uframe */
2276                frame = now_uframe >> 3;
2277                if (frame == (clock >> 3))
2278                        uframes = now_uframe & 0x07;
2279                else {
2280                        /* safe to scan the whole frame at once */
2281                        now_uframe |= 0x07;
2282                        uframes = 8;
2283                }
2284
2285restart:
2286                /* scan each element in frame's queue for completions */
2287                q_p = &oxu->pshadow[frame];
2288                hw_p = &oxu->periodic[frame];
2289                q.ptr = q_p->ptr;
2290                type = Q_NEXT_TYPE(*hw_p);
2291                modified = 0;
2292
2293                while (q.ptr != NULL) {
2294                        union ehci_shadow temp;
2295                        int live;
2296
2297                        live = HC_IS_RUNNING(oxu_to_hcd(oxu)->state);
2298                        switch (type) {
2299                        case Q_TYPE_QH:
2300                                /* handle any completions */
2301                                temp.qh = qh_get(q.qh);
2302                                type = Q_NEXT_TYPE(q.qh->hw_next);
2303                                q = q.qh->qh_next;
2304                                modified = qh_completions(oxu, temp.qh);
2305                                if (unlikely(list_empty(&temp.qh->qtd_list)))
2306                                        intr_deschedule(oxu, temp.qh);
2307                                qh_put(temp.qh);
2308                                break;
2309                        default:
2310                                oxu_dbg(oxu, "corrupt type %d frame %d shadow %p\n",
2311                                        type, frame, q.ptr);
2312                                q.ptr = NULL;
2313                        }
2314
2315                        /* assume completion callbacks modify the queue */
2316                        if (unlikely(modified))
2317                                goto restart;
2318                }
2319
2320                /* Stop when we catch up to the HC */
2321
2322                /* FIXME:  this assumes we won't get lapped when
2323                 * latencies climb; that should be rare, but...
2324                 * detect it, and just go all the way around.
2325                 * FLR might help detect this case, so long as latencies
2326                 * don't exceed periodic_size msec (default 1.024 sec).
2327                 */
2328
2329                /* FIXME: likewise assumes HC doesn't halt mid-scan */
2330
2331                if (now_uframe == clock) {
2332                        unsigned        now;
2333
2334                        if (!HC_IS_RUNNING(oxu_to_hcd(oxu)->state))
2335                                break;
2336                        oxu->next_uframe = now_uframe;
2337                        now = readl(&oxu->regs->frame_index) % mod;
2338                        if (now_uframe == now)
2339                                break;
2340
2341                        /* rescan the rest of this frame, then ... */
2342                        clock = now;
2343                } else {
2344                        now_uframe++;
2345                        now_uframe %= mod;
2346                }
2347        }
2348}
2349
2350/* On some systems, leaving remote wakeup enabled prevents system shutdown.
2351 * The firmware seems to think that powering off is a wakeup event!
2352 * This routine turns off remote wakeup and everything else, on all ports.
2353 */
2354static void ehci_turn_off_all_ports(struct oxu_hcd *oxu)
2355{
2356        int port = HCS_N_PORTS(oxu->hcs_params);
2357
2358        while (port--)
2359                writel(PORT_RWC_BITS, &oxu->regs->port_status[port]);
2360}
2361
2362static void ehci_port_power(struct oxu_hcd *oxu, int is_on)
2363{
2364        unsigned port;
2365
2366        if (!HCS_PPC(oxu->hcs_params))
2367                return;
2368
2369        oxu_dbg(oxu, "...power%s ports...\n", is_on ? "up" : "down");
2370        for (port = HCS_N_PORTS(oxu->hcs_params); port > 0; )
2371                (void) oxu_hub_control(oxu_to_hcd(oxu),
2372                                is_on ? SetPortFeature : ClearPortFeature,
2373                                USB_PORT_FEAT_POWER,
2374                                port--, NULL, 0);
2375        msleep(20);
2376}
2377
2378/* Called from some interrupts, timers, and so on.
2379 * It calls driver completion functions, after dropping oxu->lock.
2380 */
2381static void ehci_work(struct oxu_hcd *oxu)
2382{
2383        timer_action_done(oxu, TIMER_IO_WATCHDOG);
2384        if (oxu->reclaim_ready)
2385                end_unlink_async(oxu);
2386
2387        /* another CPU may drop oxu->lock during a schedule scan while
2388         * it reports urb completions.  this flag guards against bogus
2389         * attempts at re-entrant schedule scanning.
2390         */
2391        if (oxu->scanning)
2392                return;
2393        oxu->scanning = 1;
2394        scan_async(oxu);
2395        if (oxu->next_uframe != -1)
2396                scan_periodic(oxu);
2397        oxu->scanning = 0;
2398
2399        /* the IO watchdog guards against hardware or driver bugs that
2400         * misplace IRQs, and should let us run completely without IRQs.
2401         * such lossage has been observed on both VT6202 and VT8235.
2402         */
2403        if (HC_IS_RUNNING(oxu_to_hcd(oxu)->state) &&
2404                        (oxu->async->qh_next.ptr != NULL ||
2405                         oxu->periodic_sched != 0))
2406                timer_action(oxu, TIMER_IO_WATCHDOG);
2407}
2408
2409static void unlink_async(struct oxu_hcd *oxu, struct ehci_qh *qh)
2410{
2411        /* if we need to use IAA and it's busy, defer */
2412        if (qh->qh_state == QH_STATE_LINKED
2413                        && oxu->reclaim
2414                        && HC_IS_RUNNING(oxu_to_hcd(oxu)->state)) {
2415                struct ehci_qh          *last;
2416
2417                for (last = oxu->reclaim;
2418                                last->reclaim;
2419                                last = last->reclaim)
2420                        continue;
2421                qh->qh_state = QH_STATE_UNLINK_WAIT;
2422                last->reclaim = qh;
2423
2424        /* bypass IAA if the hc can't care */
2425        } else if (!HC_IS_RUNNING(oxu_to_hcd(oxu)->state) && oxu->reclaim)
2426                end_unlink_async(oxu);
2427
2428        /* something else might have unlinked the qh by now */
2429        if (qh->qh_state == QH_STATE_LINKED)
2430                start_unlink_async(oxu, qh);
2431}
2432
2433/*
2434 * USB host controller methods
2435 */
2436
2437static irqreturn_t oxu210_hcd_irq(struct usb_hcd *hcd)
2438{
2439        struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2440        u32 status, pcd_status = 0;
2441        int bh;
2442
2443        spin_lock(&oxu->lock);
2444
2445        status = readl(&oxu->regs->status);
2446
2447        /* e.g. cardbus physical eject */
2448        if (status == ~(u32) 0) {
2449                oxu_dbg(oxu, "device removed\n");
2450                goto dead;
2451        }
2452
2453        /* Shared IRQ? */
2454        status &= INTR_MASK;
2455        if (!status || unlikely(hcd->state == HC_STATE_HALT)) {
2456                spin_unlock(&oxu->lock);
2457                return IRQ_NONE;
2458        }
2459
2460        /* clear (just) interrupts */
2461        writel(status, &oxu->regs->status);
2462        readl(&oxu->regs->command);     /* unblock posted write */
2463        bh = 0;
2464
2465#ifdef OXU_VERBOSE_DEBUG
2466        /* unrequested/ignored: Frame List Rollover */
2467        dbg_status(oxu, "irq", status);
2468#endif
2469
2470        /* INT, ERR, and IAA interrupt rates can be throttled */
2471
2472        /* normal [4.15.1.2] or error [4.15.1.1] completion */
2473        if (likely((status & (STS_INT|STS_ERR)) != 0))
2474                bh = 1;
2475
2476        /* complete the unlinking of some qh [4.15.2.3] */
2477        if (status & STS_IAA) {
2478                oxu->reclaim_ready = 1;
2479                bh = 1;
2480        }
2481
2482        /* remote wakeup [4.3.1] */
2483        if (status & STS_PCD) {
2484                unsigned i = HCS_N_PORTS(oxu->hcs_params);
2485                pcd_status = status;
2486
2487                /* resume root hub? */
2488                if (!(readl(&oxu->regs->command) & CMD_RUN))
2489                        usb_hcd_resume_root_hub(hcd);
2490
2491                while (i--) {
2492                        int pstatus = readl(&oxu->regs->port_status[i]);
2493
2494                        if (pstatus & PORT_OWNER)
2495                                continue;
2496                        if (!(pstatus & PORT_RESUME)
2497                                        || oxu->reset_done[i] != 0)
2498                                continue;
2499
2500                        /* start 20 msec resume signaling from this port,
2501                         * and make khubd collect PORT_STAT_C_SUSPEND to
2502                         * stop that signaling.
2503                         */
2504                        oxu->reset_done[i] = jiffies + msecs_to_jiffies(20);
2505                        oxu_dbg(oxu, "port %d remote wakeup\n", i + 1);
2506                        mod_timer(&hcd->rh_timer, oxu->reset_done[i]);
2507                }
2508        }
2509
2510        /* PCI errors [4.15.2.4] */
2511        if (unlikely((status & STS_FATAL) != 0)) {
2512                /* bogus "fatal" IRQs appear on some chips... why?  */
2513                status = readl(&oxu->regs->status);
2514                dbg_cmd(oxu, "fatal", readl(&oxu->regs->command));
2515                dbg_status(oxu, "fatal", status);
2516                if (status & STS_HALT) {
2517                        oxu_err(oxu, "fatal error\n");
2518dead:
2519                        ehci_reset(oxu);
2520                        writel(0, &oxu->regs->configured_flag);
2521                        usb_hc_died(hcd);
2522                        /* generic layer kills/unlinks all urbs, then
2523                         * uses oxu_stop to clean up the rest
2524                         */
2525                        bh = 1;
2526                }
2527        }
2528
2529        if (bh)
2530                ehci_work(oxu);
2531        spin_unlock(&oxu->lock);
2532        if (pcd_status & STS_PCD)
2533                usb_hcd_poll_rh_status(hcd);
2534        return IRQ_HANDLED;
2535}
2536
2537static irqreturn_t oxu_irq(struct usb_hcd *hcd)
2538{
2539        struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2540        int ret = IRQ_HANDLED;
2541
2542        u32 status = oxu_readl(hcd->regs, OXU_CHIPIRQSTATUS);
2543        u32 enable = oxu_readl(hcd->regs, OXU_CHIPIRQEN_SET);
2544
2545        /* Disable all interrupt */
2546        oxu_writel(hcd->regs, OXU_CHIPIRQEN_CLR, enable);
2547
2548        if ((oxu->is_otg && (status & OXU_USBOTGI)) ||
2549                (!oxu->is_otg && (status & OXU_USBSPHI)))
2550                oxu210_hcd_irq(hcd);
2551        else
2552                ret = IRQ_NONE;
2553
2554        /* Enable all interrupt back */
2555        oxu_writel(hcd->regs, OXU_CHIPIRQEN_SET, enable);
2556
2557        return ret;
2558}
2559
2560static void oxu_watchdog(unsigned long param)
2561{
2562        struct oxu_hcd  *oxu = (struct oxu_hcd *) param;
2563        unsigned long flags;
2564
2565        spin_lock_irqsave(&oxu->lock, flags);
2566
2567        /* lost IAA irqs wedge things badly; seen with a vt8235 */
2568        if (oxu->reclaim) {
2569                u32 status = readl(&oxu->regs->status);
2570                if (status & STS_IAA) {
2571                        oxu_vdbg(oxu, "lost IAA\n");
2572                        writel(STS_IAA, &oxu->regs->status);
2573                        oxu->reclaim_ready = 1;
2574                }
2575        }
2576
2577        /* stop async processing after it's idled a bit */
2578        if (test_bit(TIMER_ASYNC_OFF, &oxu->actions))
2579                start_unlink_async(oxu, oxu->async);
2580
2581        /* oxu could run by timer, without IRQs ... */
2582        ehci_work(oxu);
2583
2584        spin_unlock_irqrestore(&oxu->lock, flags);
2585}
2586
2587/* One-time init, only for memory state.
2588 */
2589static int oxu_hcd_init(struct usb_hcd *hcd)
2590{
2591        struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2592        u32 temp;
2593        int retval;
2594        u32 hcc_params;
2595
2596        spin_lock_init(&oxu->lock);
2597
2598        init_timer(&oxu->watchdog);
2599        oxu->watchdog.function = oxu_watchdog;
2600        oxu->watchdog.data = (unsigned long) oxu;
2601
2602        /*
2603         * hw default: 1K periodic list heads, one per frame.
2604         * periodic_size can shrink by USBCMD update if hcc_params allows.
2605         */
2606        oxu->periodic_size = DEFAULT_I_TDPS;
2607        retval = ehci_mem_init(oxu, GFP_KERNEL);
2608        if (retval < 0)
2609                return retval;
2610
2611        /* controllers may cache some of the periodic schedule ... */
2612        hcc_params = readl(&oxu->caps->hcc_params);
2613        if (HCC_ISOC_CACHE(hcc_params))         /* full frame cache */
2614                oxu->i_thresh = 8;
2615        else                                    /* N microframes cached */
2616                oxu->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
2617
2618        oxu->reclaim = NULL;
2619        oxu->reclaim_ready = 0;
2620        oxu->next_uframe = -1;
2621
2622        /*
2623         * dedicate a qh for the async ring head, since we couldn't unlink
2624         * a 'real' qh without stopping the async schedule [4.8].  use it
2625         * as the 'reclamation list head' too.
2626         * its dummy is used in hw_alt_next of many tds, to prevent the qh
2627         * from automatically advancing to the next td after short reads.
2628         */
2629        oxu->async->qh_next.qh = NULL;
2630        oxu->async->hw_next = QH_NEXT(oxu->async->qh_dma);
2631        oxu->async->hw_info1 = cpu_to_le32(QH_HEAD);
2632        oxu->async->hw_token = cpu_to_le32(QTD_STS_HALT);
2633        oxu->async->hw_qtd_next = EHCI_LIST_END;
2634        oxu->async->qh_state = QH_STATE_LINKED;
2635        oxu->async->hw_alt_next = QTD_NEXT(oxu->async->dummy->qtd_dma);
2636
2637        /* clear interrupt enables, set irq latency */
2638        if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
2639                log2_irq_thresh = 0;
2640        temp = 1 << (16 + log2_irq_thresh);
2641        if (HCC_CANPARK(hcc_params)) {
2642                /* HW default park == 3, on hardware that supports it (like
2643                 * NVidia and ALI silicon), maximizes throughput on the async
2644                 * schedule by avoiding QH fetches between transfers.
2645                 *
2646                 * With fast usb storage devices and NForce2, "park" seems to
2647                 * make problems:  throughput reduction (!), data errors...
2648                 */
2649                if (park) {
2650                        park = min(park, (unsigned) 3);
2651                        temp |= CMD_PARK;
2652                        temp |= park << 8;
2653                }
2654                oxu_dbg(oxu, "park %d\n", park);
2655        }
2656        if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
2657                /* periodic schedule size can be smaller than default */
2658                temp &= ~(3 << 2);
2659                temp |= (EHCI_TUNE_FLS << 2);
2660        }
2661        oxu->command = temp;
2662
2663        return 0;
2664}
2665
2666/* Called during probe() after chip reset completes.
2667 */
2668static int oxu_reset(struct usb_hcd *hcd)
2669{
2670        struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2671        int ret;
2672
2673        spin_lock_init(&oxu->mem_lock);
2674        INIT_LIST_HEAD(&oxu->urb_list);
2675        oxu->urb_len = 0;
2676
2677        /* FIMXE */
2678        hcd->self.controller->dma_mask = NULL;
2679
2680        if (oxu->is_otg) {
2681                oxu->caps = hcd->regs + OXU_OTG_CAP_OFFSET;
2682                oxu->regs = hcd->regs + OXU_OTG_CAP_OFFSET + \
2683                        HC_LENGTH(readl(&oxu->caps->hc_capbase));
2684
2685                oxu->mem = hcd->regs + OXU_SPH_MEM;
2686        } else {
2687                oxu->caps = hcd->regs + OXU_SPH_CAP_OFFSET;
2688                oxu->regs = hcd->regs + OXU_SPH_CAP_OFFSET + \
2689                        HC_LENGTH(readl(&oxu->caps->hc_capbase));
2690
2691                oxu->mem = hcd->regs + OXU_OTG_MEM;
2692        }
2693
2694        oxu->hcs_params = readl(&oxu->caps->hcs_params);
2695        oxu->sbrn = 0x20;
2696
2697        ret = oxu_hcd_init(hcd);
2698        if (ret)
2699                return ret;
2700
2701        return 0;
2702}
2703
2704static int oxu_run(struct usb_hcd *hcd)
2705{
2706        struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2707        int retval;
2708        u32 temp, hcc_params;
2709
2710        hcd->uses_new_polling = 1;
2711
2712        /* EHCI spec section 4.1 */
2713        retval = ehci_reset(oxu);
2714        if (retval != 0) {
2715                ehci_mem_cleanup(oxu);
2716                return retval;
2717        }
2718        writel(oxu->periodic_dma, &oxu->regs->frame_list);
2719        writel((u32) oxu->async->qh_dma, &oxu->regs->async_next);
2720
2721        /* hcc_params controls whether oxu->regs->segment must (!!!)
2722         * be used; it constrains QH/ITD/SITD and QTD locations.
2723         * pci_pool consistent memory always uses segment zero.
2724         * streaming mappings for I/O buffers, like pci_map_single(),
2725         * can return segments above 4GB, if the device allows.
2726         *
2727         * NOTE:  the dma mask is visible through dma_supported(), so
2728         * drivers can pass this info along ... like NETIF_F_HIGHDMA,
2729         * Scsi_Host.highmem_io, and so forth.  It's readonly to all
2730         * host side drivers though.
2731         */
2732        hcc_params = readl(&oxu->caps->hcc_params);
2733        if (HCC_64BIT_ADDR(hcc_params))
2734                writel(0, &oxu->regs->segment);
2735
2736        oxu->command &= ~(CMD_LRESET | CMD_IAAD | CMD_PSE |
2737                                CMD_ASE | CMD_RESET);
2738        oxu->command |= CMD_RUN;
2739        writel(oxu->command, &oxu->regs->command);
2740        dbg_cmd(oxu, "init", oxu->command);
2741
2742        /*
2743         * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
2744         * are explicitly handed to companion controller(s), so no TT is
2745         * involved with the root hub.  (Except where one is integrated,
2746         * and there's no companion controller unless maybe for USB OTG.)
2747         */
2748        hcd->state = HC_STATE_RUNNING;
2749        writel(FLAG_CF, &oxu->regs->configured_flag);
2750        readl(&oxu->regs->command);     /* unblock posted writes */
2751
2752        temp = HC_VERSION(readl(&oxu->caps->hc_capbase));
2753        oxu_info(oxu, "USB %x.%x started, quasi-EHCI %x.%02x, driver %s%s\n",
2754                ((oxu->sbrn & 0xf0)>>4), (oxu->sbrn & 0x0f),
2755                temp >> 8, temp & 0xff, DRIVER_VERSION,
2756                ignore_oc ? ", overcurrent ignored" : "");
2757
2758        writel(INTR_MASK, &oxu->regs->intr_enable); /* Turn On Interrupts */
2759
2760        return 0;
2761}
2762
2763static void oxu_stop(struct usb_hcd *hcd)
2764{
2765        struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2766
2767        /* Turn off port power on all root hub ports. */
2768        ehci_port_power(oxu, 0);
2769
2770        /* no more interrupts ... */
2771        del_timer_sync(&oxu->watchdog);
2772
2773        spin_lock_irq(&oxu->lock);
2774        if (HC_IS_RUNNING(hcd->state))
2775                ehci_quiesce(oxu);
2776
2777        ehci_reset(oxu);
2778        writel(0, &oxu->regs->intr_enable);
2779        spin_unlock_irq(&oxu->lock);
2780
2781        /* let companion controllers work when we aren't */
2782        writel(0, &oxu->regs->configured_flag);
2783
2784        /* root hub is shut down separately (first, when possible) */
2785        spin_lock_irq(&oxu->lock);
2786        if (oxu->async)
2787                ehci_work(oxu);
2788        spin_unlock_irq(&oxu->lock);
2789        ehci_mem_cleanup(oxu);
2790
2791        dbg_status(oxu, "oxu_stop completed", readl(&oxu->regs->status));
2792}
2793
2794/* Kick in for silicon on any bus (not just pci, etc).
2795 * This forcibly disables dma and IRQs, helping kexec and other cases
2796 * where the next system software may expect clean state.
2797 */
2798static void oxu_shutdown(struct usb_hcd *hcd)
2799{
2800        struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2801
2802        (void) ehci_halt(oxu);
2803        ehci_turn_off_all_ports(oxu);
2804
2805        /* make BIOS/etc use companion controller during reboot */
2806        writel(0, &oxu->regs->configured_flag);
2807
2808        /* unblock posted writes */
2809        readl(&oxu->regs->configured_flag);
2810}
2811
2812/* Non-error returns are a promise to giveback() the urb later
2813 * we drop ownership so next owner (or urb unlink) can get it
2814 *
2815 * urb + dev is in hcd.self.controller.urb_list
2816 * we're queueing TDs onto software and hardware lists
2817 *
2818 * hcd-specific init for hcpriv hasn't been done yet
2819 *
2820 * NOTE:  control, bulk, and interrupt share the same code to append TDs
2821 * to a (possibly active) QH, and the same QH scanning code.
2822 */
2823static int __oxu_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
2824                                gfp_t mem_flags)
2825{
2826        struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2827        struct list_head qtd_list;
2828
2829        INIT_LIST_HEAD(&qtd_list);
2830
2831        switch (usb_pipetype(urb->pipe)) {
2832        case PIPE_CONTROL:
2833        case PIPE_BULK:
2834        default:
2835                if (!qh_urb_transaction(oxu, urb, &qtd_list, mem_flags))
2836                        return -ENOMEM;
2837                return submit_async(oxu, urb, &qtd_list, mem_flags);
2838
2839        case PIPE_INTERRUPT:
2840                if (!qh_urb_transaction(oxu, urb, &qtd_list, mem_flags))
2841                        return -ENOMEM;
2842                return intr_submit(oxu, urb, &qtd_list, mem_flags);
2843
2844        case PIPE_ISOCHRONOUS:
2845                if (urb->dev->speed == USB_SPEED_HIGH)
2846                        return itd_submit(oxu, urb, mem_flags);
2847                else
2848                        return sitd_submit(oxu, urb, mem_flags);
2849        }
2850}
2851
2852/* This function is responsible for breaking URBs with big data size
2853 * into smaller size and processing small urbs in sequence.
2854 */
2855static int oxu_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
2856                                gfp_t mem_flags)
2857{
2858        struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2859        int num, rem;
2860        int transfer_buffer_length;
2861        void *transfer_buffer;
2862        struct urb *murb;
2863        int i, ret;
2864
2865        /* If not bulk pipe just enqueue the URB */
2866        if (!usb_pipebulk(urb->pipe))
2867                return __oxu_urb_enqueue(hcd, urb, mem_flags);
2868
2869        /* Otherwise we should verify the USB transfer buffer size! */
2870        transfer_buffer = urb->transfer_buffer;
2871        transfer_buffer_length = urb->transfer_buffer_length;
2872
2873        num = urb->transfer_buffer_length / 4096;
2874        rem = urb->transfer_buffer_length % 4096;
2875        if (rem != 0)
2876                num++;
2877
2878        /* If URB is smaller than 4096 bytes just enqueue it! */
2879        if (num == 1)
2880                return __oxu_urb_enqueue(hcd, urb, mem_flags);
2881
2882        /* Ok, we have more job to do! :) */
2883
2884        for (i = 0; i < num - 1; i++) {
2885                /* Get free micro URB poll till a free urb is received */
2886
2887                do {
2888                        murb = (struct urb *) oxu_murb_alloc(oxu);
2889                        if (!murb)
2890                                schedule();
2891                } while (!murb);
2892
2893                /* Coping the urb */
2894                memcpy(murb, urb, sizeof(struct urb));
2895
2896                murb->transfer_buffer_length = 4096;
2897                murb->transfer_buffer = transfer_buffer + i * 4096;
2898
2899                /* Null pointer for the encodes that this is a micro urb */
2900                murb->complete = NULL;
2901
2902                ((struct oxu_murb *) murb)->main = urb;
2903                ((struct oxu_murb *) murb)->last = 0;
2904
2905                /* This loop is to guarantee urb to be processed when there's
2906                 * not enough resources at a particular time by retrying.
2907                 */
2908                do {
2909                        ret  = __oxu_urb_enqueue(hcd, murb, mem_flags);
2910                        if (ret)
2911                                schedule();
2912                } while (ret);
2913        }
2914
2915        /* Last urb requires special handling  */
2916
2917        /* Get free micro URB poll till a free urb is received */
2918        do {
2919                murb = (struct urb *) oxu_murb_alloc(oxu);
2920                if (!murb)
2921                        schedule();
2922        } while (!murb);
2923
2924        /* Coping the urb */
2925        memcpy(murb, urb, sizeof(struct urb));
2926
2927        murb->transfer_buffer_length = rem > 0 ? rem : 4096;
2928        murb->transfer_buffer = transfer_buffer + (num - 1) * 4096;
2929
2930        /* Null pointer for the encodes that this is a micro urb */
2931        murb->complete = NULL;
2932
2933        ((struct oxu_murb *) murb)->main = urb;
2934        ((struct oxu_murb *) murb)->last = 1;
2935
2936        do {
2937                ret = __oxu_urb_enqueue(hcd, murb, mem_flags);
2938                if (ret)
2939                        schedule();
2940        } while (ret);
2941
2942        return ret;
2943}
2944
2945/* Remove from hardware lists.
2946 * Completions normally happen asynchronously
2947 */
2948static int oxu_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
2949{
2950        struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2951        struct ehci_qh *qh;
2952        unsigned long flags;
2953
2954        spin_lock_irqsave(&oxu->lock, flags);
2955        switch (usb_pipetype(urb->pipe)) {
2956        case PIPE_CONTROL:
2957        case PIPE_BULK:
2958        default:
2959                qh = (struct ehci_qh *) urb->hcpriv;
2960                if (!qh)
2961                        break;
2962                unlink_async(oxu, qh);
2963                break;
2964
2965        case PIPE_INTERRUPT:
2966                qh = (struct ehci_qh *) urb->hcpriv;
2967                if (!qh)
2968                        break;
2969                switch (qh->qh_state) {
2970                case QH_STATE_LINKED:
2971                        intr_deschedule(oxu, qh);
2972                        /* FALL THROUGH */
2973                case QH_STATE_IDLE:
2974                        qh_completions(oxu, qh);
2975                        break;
2976                default:
2977                        oxu_dbg(oxu, "bogus qh %p state %d\n",
2978                                        qh, qh->qh_state);
2979                        goto done;
2980                }
2981
2982                /* reschedule QH iff another request is queued */
2983                if (!list_empty(&qh->qtd_list)
2984                                && HC_IS_RUNNING(hcd->state)) {
2985                        int status;
2986
2987                        status = qh_schedule(oxu, qh);
2988                        spin_unlock_irqrestore(&oxu->lock, flags);
2989
2990                        if (status != 0) {
2991                                /* shouldn't happen often, but ...
2992                                 * FIXME kill those tds' urbs
2993                                 */
2994                                dev_err(hcd->self.controller,
2995                                        "can't reschedule qh %p, err %d\n", qh,
2996                                        status);
2997                        }
2998                        return status;
2999                }
3000                break;
3001        }
3002done:
3003        spin_unlock_irqrestore(&oxu->lock, flags);
3004        return 0;
3005}
3006
3007/* Bulk qh holds the data toggle */
3008static void oxu_endpoint_disable(struct usb_hcd *hcd,
3009                                        struct usb_host_endpoint *ep)
3010{
3011        struct oxu_hcd *oxu = hcd_to_oxu(hcd);
3012        unsigned long           flags;
3013        struct ehci_qh          *qh, *tmp;
3014
3015        /* ASSERT:  any requests/urbs are being unlinked */
3016        /* ASSERT:  nobody can be submitting urbs for this any more */
3017
3018rescan:
3019        spin_lock_irqsave(&oxu->lock, flags);
3020        qh = ep->hcpriv;
3021        if (!qh)
3022                goto done;
3023
3024        /* endpoints can be iso streams.  for now, we don't
3025         * accelerate iso completions ... so spin a while.
3026         */
3027        if (qh->hw_info1 == 0) {
3028                oxu_vdbg(oxu, "iso delay\n");
3029                goto idle_timeout;
3030        }
3031
3032        if (!HC_IS_RUNNING(hcd->state))
3033                qh->qh_state = QH_STATE_IDLE;
3034        switch (qh->qh_state) {
3035        case QH_STATE_LINKED:
3036                for (tmp = oxu->async->qh_next.qh;
3037                                tmp && tmp != qh;
3038                                tmp = tmp->qh_next.qh)
3039                        continue;
3040                /* periodic qh self-unlinks on empty */
3041                if (!tmp)
3042                        goto nogood;
3043                unlink_async(oxu, qh);
3044                /* FALL THROUGH */
3045        case QH_STATE_UNLINK:           /* wait for hw to finish? */
3046idle_timeout:
3047                spin_unlock_irqrestore(&oxu->lock, flags);
3048                schedule_timeout_uninterruptible(1);
3049                goto rescan;
3050        case QH_STATE_IDLE:             /* fully unlinked */
3051                if (list_empty(&qh->qtd_list)) {
3052                        qh_put(qh);
3053                        break;
3054                }
3055                /* else FALL THROUGH */
3056        default:
3057nogood:
3058                /* caller was supposed to have unlinked any requests;
3059                 * that's not our job.  just leak this memory.
3060                 */
3061                oxu_err(oxu, "qh %p (#%02x) state %d%s\n",
3062                        qh, ep->desc.bEndpointAddress, qh->qh_state,
3063                        list_empty(&qh->qtd_list) ? "" : "(has tds)");
3064                break;
3065        }
3066        ep->hcpriv = NULL;
3067done:
3068        spin_unlock_irqrestore(&oxu->lock, flags);
3069}
3070
3071static int oxu_get_frame(struct usb_hcd *hcd)
3072{
3073        struct oxu_hcd *oxu = hcd_to_oxu(hcd);
3074
3075        return (readl(&oxu->regs->frame_index) >> 3) %
3076                oxu->periodic_size;
3077}
3078
3079/* Build "status change" packet (one or two bytes) from HC registers */
3080static int oxu_hub_status_data(struct usb_hcd *hcd, char *buf)
3081{
3082        struct oxu_hcd *oxu = hcd_to_oxu(hcd);
3083        u32 temp, mask, status = 0;
3084        int ports, i, retval = 1;
3085        unsigned long flags;
3086
3087        /* if !USB_SUSPEND, root hub timers won't get shut down ... */
3088        if (!HC_IS_RUNNING(hcd->state))
3089                return 0;
3090
3091        /* init status to no-changes */
3092        buf[0] = 0;
3093        ports = HCS_N_PORTS(oxu->hcs_params);
3094        if (ports > 7) {
3095                buf[1] = 0;
3096                retval++;
3097        }
3098
3099        /* Some boards (mostly VIA?) report bogus overcurrent indications,
3100         * causing massive log spam unless we completely ignore them.  It
3101         * may be relevant that VIA VT8235 controllers, where PORT_POWER is
3102         * always set, seem to clear PORT_OCC and PORT_CSC when writing to
3103         * PORT_POWER; that's surprising, but maybe within-spec.
3104         */
3105        if (!ignore_oc)
3106                mask = PORT_CSC | PORT_PEC | PORT_OCC;
3107        else
3108                mask = PORT_CSC | PORT_PEC;
3109
3110        /* no hub change reports (bit 0) for now (power, ...) */
3111
3112        /* port N changes (bit N)? */
3113        spin_lock_irqsave(&oxu->lock, flags);
3114        for (i = 0; i < ports; i++) {
3115                temp = readl(&oxu->regs->port_status[i]);
3116
3117                /*
3118                 * Return status information even for ports with OWNER set.
3119                 * Otherwise khubd wouldn't see the disconnect event when a
3120                 * high-speed device is switched over to the companion
3121                 * controller by the user.
3122                 */
3123
3124                if (!(temp & PORT_CONNECT))
3125                        oxu->reset_done[i] = 0;
3126                if ((temp & mask) != 0 || ((temp & PORT_RESUME) != 0 &&
3127                                time_after_eq(jiffies, oxu->reset_done[i]))) {
3128                        if (i < 7)
3129                                buf[0] |= 1 << (i + 1);
3130                        else
3131                                buf[1] |= 1 << (i - 7);
3132                        status = STS_PCD;
3133                }
3134        }
3135        /* FIXME autosuspend idle root hubs */
3136        spin_unlock_irqrestore(&oxu->lock, flags);
3137        return status ? retval : 0;
3138}
3139
3140/* Returns the speed of a device attached to a port on the root hub. */
3141static inline unsigned int oxu_port_speed(struct oxu_hcd *oxu,
3142                                                unsigned int portsc)
3143{
3144        switch ((portsc >> 26) & 3) {
3145        case 0:
3146                return 0;
3147        case 1:
3148                return USB_PORT_STAT_LOW_SPEED;
3149        case 2:
3150        default:
3151                return USB_PORT_STAT_HIGH_SPEED;
3152        }
3153}
3154
3155#define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
3156static int oxu_hub_control(struct usb_hcd *hcd, u16 typeReq,
3157                                u16 wValue, u16 wIndex, char *buf, u16 wLength)
3158{
3159        struct oxu_hcd *oxu = hcd_to_oxu(hcd);
3160        int ports = HCS_N_PORTS(oxu->hcs_params);
3161        u32 __iomem *status_reg = &oxu->regs->port_status[wIndex - 1];
3162        u32 temp, status;
3163        unsigned long   flags;
3164        int retval = 0;
3165        unsigned selector;
3166
3167        /*
3168         * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
3169         * HCS_INDICATOR may say we can change LEDs to off/amber/green.
3170         * (track current state ourselves) ... blink for diagnostics,
3171         * power, "this is the one", etc.  EHCI spec supports this.
3172         */
3173
3174        spin_lock_irqsave(&oxu->lock, flags);
3175        switch (typeReq) {
3176        case ClearHubFeature:
3177                switch (wValue) {
3178                case C_HUB_LOCAL_POWER:
3179                case C_HUB_OVER_CURRENT:
3180                        /* no hub-wide feature/status flags */
3181                        break;
3182                default:
3183                        goto error;
3184                }
3185                break;
3186        case ClearPortFeature:
3187                if (!wIndex || wIndex > ports)
3188                        goto error;
3189                wIndex--;
3190                temp = readl(status_reg);
3191
3192                /*
3193                 * Even if OWNER is set, so the port is owned by the
3194                 * companion controller, khubd needs to be able to clear
3195                 * the port-change status bits (especially
3196                 * USB_PORT_STAT_C_CONNECTION).
3197                 */
3198
3199                switch (wValue) {
3200                case USB_PORT_FEAT_ENABLE:
3201                        writel(temp & ~PORT_PE, status_reg);
3202                        break;
3203                case USB_PORT_FEAT_C_ENABLE:
3204                        writel((temp & ~PORT_RWC_BITS) | PORT_PEC, status_reg);
3205                        break;
3206                case USB_PORT_FEAT_SUSPEND:
3207                        if (temp & PORT_RESET)
3208                                goto error;
3209                        if (temp & PORT_SUSPEND) {
3210                                if ((temp & PORT_PE) == 0)
3211                                        goto error;
3212                                /* resume signaling for 20 msec */
3213                                temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
3214                                writel(temp | PORT_RESUME, status_reg);
3215                                oxu->reset_done[wIndex] = jiffies
3216                                                + msecs_to_jiffies(20);
3217                        }
3218                        break;
3219                case USB_PORT_FEAT_C_SUSPEND:
3220                        /* we auto-clear this feature */
3221                        break;
3222                case USB_PORT_FEAT_POWER:
3223                        if (HCS_PPC(oxu->hcs_params))
3224                                writel(temp & ~(PORT_RWC_BITS | PORT_POWER),
3225                                          status_reg);
3226                        break;
3227                case USB_PORT_FEAT_C_CONNECTION:
3228                        writel((temp & ~PORT_RWC_BITS) | PORT_CSC, status_reg);
3229                        break;
3230                case USB_PORT_FEAT_C_OVER_CURRENT:
3231                        writel((temp & ~PORT_RWC_BITS) | PORT_OCC, status_reg);
3232                        break;
3233                case USB_PORT_FEAT_C_RESET:
3234                        /* GetPortStatus clears reset */
3235                        break;
3236                default:
3237                        goto error;
3238                }
3239                readl(&oxu->regs->command);     /* unblock posted write */
3240                break;
3241        case GetHubDescriptor:
3242                ehci_hub_descriptor(oxu, (struct usb_hub_descriptor *)
3243                        buf);
3244                break;
3245        case GetHubStatus:
3246                /* no hub-wide feature/status flags */
3247                memset(buf, 0, 4);
3248                break;
3249        case GetPortStatus:
3250                if (!wIndex || wIndex > ports)
3251                        goto error;
3252                wIndex--;
3253                status = 0;
3254                temp = readl(status_reg);
3255
3256                /* wPortChange bits */
3257                if (temp & PORT_CSC)
3258                        status |= USB_PORT_STAT_C_CONNECTION << 16;
3259                if (temp & PORT_PEC)
3260                        status |= USB_PORT_STAT_C_ENABLE << 16;
3261                if ((temp & PORT_OCC) && !ignore_oc)
3262                        status |= USB_PORT_STAT_C_OVERCURRENT << 16;
3263
3264                /* whoever resumes must GetPortStatus to complete it!! */
3265                if (temp & PORT_RESUME) {
3266
3267                        /* Remote Wakeup received? */
3268                        if (!oxu->reset_done[wIndex]) {
3269                                /* resume signaling for 20 msec */
3270                                oxu->reset_done[wIndex] = jiffies
3271                                                + msecs_to_jiffies(20);
3272                                /* check the port again */
3273                                mod_timer(&oxu_to_hcd(oxu)->rh_timer,
3274                                                oxu->reset_done[wIndex]);
3275                        }
3276
3277                        /* resume completed? */
3278                        else if (time_after_eq(jiffies,
3279                                        oxu->reset_done[wIndex])) {
3280                                status |= USB_PORT_STAT_C_SUSPEND << 16;
3281                                oxu->reset_done[wIndex] = 0;
3282
3283                                /* stop resume signaling */
3284                                temp = readl(status_reg);
3285                                writel(temp & ~(PORT_RWC_BITS | PORT_RESUME),
3286                                        status_reg);
3287                                retval = handshake(oxu, status_reg,
3288                                           PORT_RESUME, 0, 2000 /* 2msec */);
3289                                if (retval != 0) {
3290                                        oxu_err(oxu,
3291                                                "port %d resume error %d\n",
3292                                                wIndex + 1, retval);
3293                                        goto error;
3294                                }
3295                                temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
3296                        }
3297                }
3298
3299                /* whoever resets must GetPortStatus to complete it!! */
3300                if ((temp & PORT_RESET)
3301                                && time_after_eq(jiffies,
3302                                        oxu->reset_done[wIndex])) {
3303                        status |= USB_PORT_STAT_C_RESET << 16;
3304                        oxu->reset_done[wIndex] = 0;
3305
3306                        /* force reset to complete */
3307                        writel(temp & ~(PORT_RWC_BITS | PORT_RESET),
3308                                        status_reg);
3309                        /* REVISIT:  some hardware needs 550+ usec to clear
3310                         * this bit; seems too long to spin routinely...
3311                         */
3312                        retval = handshake(oxu, status_reg,
3313                                        PORT_RESET, 0, 750);
3314                        if (retval != 0) {
3315                                oxu_err(oxu, "port %d reset error %d\n",
3316                                        wIndex + 1, retval);
3317                                goto error;
3318                        }
3319
3320                        /* see what we found out */
3321                        temp = check_reset_complete(oxu, wIndex, status_reg,
3322                                        readl(status_reg));
3323                }
3324
3325                /* transfer dedicated ports to the companion hc */
3326                if ((temp & PORT_CONNECT) &&
3327                                test_bit(wIndex, &oxu->companion_ports)) {
3328                        temp &= ~PORT_RWC_BITS;
3329                        temp |= PORT_OWNER;
3330                        writel(temp, status_reg);
3331                        oxu_dbg(oxu, "port %d --> companion\n", wIndex + 1);
3332                        temp = readl(status_reg);
3333                }
3334
3335                /*
3336                 * Even if OWNER is set, there's no harm letting khubd
3337                 * see the wPortStatus values (they should all be 0 except
3338                 * for PORT_POWER anyway).
3339                 */
3340
3341                if (temp & PORT_CONNECT) {
3342                        status |= USB_PORT_STAT_CONNECTION;
3343                        /* status may be from integrated TT */
3344                        status |= oxu_port_speed(oxu, temp);
3345                }
3346                if (temp & PORT_PE)
3347                        status |= USB_PORT_STAT_ENABLE;
3348                if (temp & (PORT_SUSPEND|PORT_RESUME))
3349                        status |= USB_PORT_STAT_SUSPEND;
3350                if (temp & PORT_OC)
3351                        status |= USB_PORT_STAT_OVERCURRENT;
3352                if (temp & PORT_RESET)
3353                        status |= USB_PORT_STAT_RESET;
3354                if (temp & PORT_POWER)
3355                        status |= USB_PORT_STAT_POWER;
3356
3357#ifndef OXU_VERBOSE_DEBUG
3358        if (status & ~0xffff)   /* only if wPortChange is interesting */
3359#endif
3360                dbg_port(oxu, "GetStatus", wIndex + 1, temp);
3361                put_unaligned(cpu_to_le32(status), (__le32 *) buf);
3362                break;
3363        case SetHubFeature:
3364                switch (wValue) {
3365                case C_HUB_LOCAL_POWER:
3366                case C_HUB_OVER_CURRENT:
3367                        /* no hub-wide feature/status flags */
3368                        break;
3369                default:
3370                        goto error;
3371                }
3372                break;
3373        case SetPortFeature:
3374                selector = wIndex >> 8;
3375                wIndex &= 0xff;
3376                if (!wIndex || wIndex > ports)
3377                        goto error;
3378                wIndex--;
3379                temp = readl(status_reg);
3380                if (temp & PORT_OWNER)
3381                        break;
3382
3383                temp &= ~PORT_RWC_BITS;
3384                switch (wValue) {
3385                case USB_PORT_FEAT_SUSPEND:
3386                        if ((temp & PORT_PE) == 0
3387                                        || (temp & PORT_RESET) != 0)
3388                                goto error;
3389                        if (device_may_wakeup(&hcd->self.root_hub->dev))
3390                                temp |= PORT_WAKE_BITS;
3391                        writel(temp | PORT_SUSPEND, status_reg);
3392                        break;
3393                case USB_PORT_FEAT_POWER:
3394                        if (HCS_PPC(oxu->hcs_params))
3395                                writel(temp | PORT_POWER, status_reg);
3396                        break;
3397                case USB_PORT_FEAT_RESET:
3398                        if (temp & PORT_RESUME)
3399                                goto error;
3400                        /* line status bits may report this as low speed,
3401                         * which can be fine if this root hub has a
3402                         * transaction translator built in.
3403                         */
3404                        oxu_vdbg(oxu, "port %d reset\n", wIndex + 1);
3405                        temp |= PORT_RESET;
3406                        temp &= ~PORT_PE;
3407
3408                        /*
3409                         * caller must wait, then call GetPortStatus
3410                         * usb 2.0 spec says 50 ms resets on root
3411                         */
3412                        oxu->reset_done[wIndex] = jiffies
3413                                        + msecs_to_jiffies(50);
3414                        writel(temp, status_reg);
3415                        break;
3416
3417                /* For downstream facing ports (these):  one hub port is put
3418                 * into test mode according to USB2 11.24.2.13, then the hub
3419                 * must be reset (which for root hub now means rmmod+modprobe,
3420                 * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
3421                 * about the EHCI-specific stuff.
3422                 */
3423                case USB_PORT_FEAT_TEST:
3424                        if (!selector || selector > 5)
3425                                goto error;
3426                        ehci_quiesce(oxu);
3427                        ehci_halt(oxu);
3428                        temp |= selector << 16;
3429                        writel(temp, status_reg);
3430                        break;
3431
3432                default:
3433                        goto error;
3434                }
3435                readl(&oxu->regs->command);     /* unblock posted writes */
3436                break;
3437
3438        default:
3439error:
3440                /* "stall" on error */
3441                retval = -EPIPE;
3442        }
3443        spin_unlock_irqrestore(&oxu->lock, flags);
3444        return retval;
3445}
3446
3447#ifdef CONFIG_PM
3448
3449static int oxu_bus_suspend(struct usb_hcd *hcd)
3450{
3451        struct oxu_hcd *oxu = hcd_to_oxu(hcd);
3452        int port;
3453        int mask;
3454
3455        oxu_dbg(oxu, "suspend root hub\n");
3456
3457        if (time_before(jiffies, oxu->next_statechange))
3458                msleep(5);
3459
3460        port = HCS_N_PORTS(oxu->hcs_params);
3461        spin_lock_irq(&oxu->lock);
3462
3463        /* stop schedules, clean any completed work */
3464        if (HC_IS_RUNNING(hcd->state)) {
3465                ehci_quiesce(oxu);
3466                hcd->state = HC_STATE_QUIESCING;
3467        }
3468        oxu->command = readl(&oxu->regs->command);
3469        if (oxu->reclaim)
3470                oxu->reclaim_ready = 1;
3471        ehci_work(oxu);
3472
3473        /* Unlike other USB host controller types, EHCI doesn't have
3474         * any notion of "global" or bus-wide suspend.  The driver has
3475         * to manually suspend all the active unsuspended ports, and
3476         * then manually resume them in the bus_resume() routine.
3477         */
3478        oxu->bus_suspended = 0;
3479        while (port--) {
3480                u32 __iomem *reg = &oxu->regs->port_status[port];
3481                u32 t1 = readl(reg) & ~PORT_RWC_BITS;
3482                u32 t2 = t1;
3483
3484                /* keep track of which ports we suspend */
3485                if ((t1 & PORT_PE) && !(t1 & PORT_OWNER) &&
3486                                !(t1 & PORT_SUSPEND)) {
3487                        t2 |= PORT_SUSPEND;
3488                        set_bit(port, &oxu->bus_suspended);
3489                }
3490
3491                /* enable remote wakeup on all ports */
3492                if (device_may_wakeup(&hcd->self.root_hub->dev))
3493                        t2 |= PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E;
3494                else
3495                        t2 &= ~(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E);
3496
3497                if (t1 != t2) {
3498                        oxu_vdbg(oxu, "port %d, %08x -> %08x\n",
3499                                port + 1, t1, t2);
3500                        writel(t2, reg);
3501                }
3502        }
3503
3504        /* turn off now-idle HC */
3505        del_timer_sync(&oxu->watchdog);
3506        ehci_halt(oxu);
3507        hcd->state = HC_STATE_SUSPENDED;
3508
3509        /* allow remote wakeup */
3510        mask = INTR_MASK;
3511        if (!device_may_wakeup(&hcd->self.root_hub->dev))
3512                mask &= ~STS_PCD;
3513        writel(mask, &oxu->regs->intr_enable);
3514        readl(&oxu->regs->intr_enable);
3515
3516        oxu->next_statechange = jiffies + msecs_to_jiffies(10);
3517        spin_unlock_irq(&oxu->lock);
3518        return 0;
3519}
3520
3521/* Caller has locked the root hub, and should reset/reinit on error */
3522static int oxu_bus_resume(struct usb_hcd *hcd)
3523{
3524        struct oxu_hcd *oxu = hcd_to_oxu(hcd);
3525        u32 temp;
3526        int i;
3527
3528        if (time_before(jiffies, oxu->next_statechange))
3529                msleep(5);
3530        spin_lock_irq(&oxu->lock);
3531
3532        /* Ideally and we've got a real resume here, and no port's power
3533         * was lost.  (For PCI, that means Vaux was maintained.)  But we
3534         * could instead be restoring a swsusp snapshot -- so that BIOS was
3535         * the last user of the controller, not reset/pm hardware keeping
3536         * state we gave to it.
3537         */
3538        temp = readl(&oxu->regs->intr_enable);
3539        oxu_dbg(oxu, "resume root hub%s\n", temp ? "" : " after power loss");
3540
3541        /* at least some APM implementations will try to deliver
3542         * IRQs right away, so delay them until we're ready.
3543         */
3544        writel(0, &oxu->regs->intr_enable);
3545
3546        /* re-init operational registers */
3547        writel(0, &oxu->regs->segment);
3548        writel(oxu->periodic_dma, &oxu->regs->frame_list);
3549        writel((u32) oxu->async->qh_dma, &oxu->regs->async_next);
3550
3551        /* restore CMD_RUN, framelist size, and irq threshold */
3552        writel(oxu->command, &oxu->regs->command);
3553
3554        /* Some controller/firmware combinations need a delay during which
3555         * they set up the port statuses.  See Bugzilla #8190. */
3556        mdelay(8);
3557
3558        /* manually resume the ports we suspended during bus_suspend() */
3559        i = HCS_N_PORTS(oxu->hcs_params);
3560        while (i--) {
3561                temp = readl(&oxu->regs->port_status[i]);
3562                temp &= ~(PORT_RWC_BITS
3563                        | PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
3564                if (test_bit(i, &oxu->bus_suspended) && (temp & PORT_SUSPEND)) {
3565                        oxu->reset_done[i] = jiffies + msecs_to_jiffies(20);
3566                        temp |= PORT_RESUME;
3567                }
3568                writel(temp, &oxu->regs->port_status[i]);
3569        }
3570        i = HCS_N_PORTS(oxu->hcs_params);
3571        mdelay(20);
3572        while (i--) {
3573                temp = readl(&oxu->regs->port_status[i]);
3574                if (test_bit(i, &oxu->bus_suspended) && (temp & PORT_SUSPEND)) {
3575                        temp &= ~(PORT_RWC_BITS | PORT_RESUME);
3576                        writel(temp, &oxu->regs->port_status[i]);
3577                        oxu_vdbg(oxu, "resumed port %d\n", i + 1);
3578                }
3579        }
3580        (void) readl(&oxu->regs->command);
3581
3582        /* maybe re-activate the schedule(s) */
3583        temp = 0;
3584        if (oxu->async->qh_next.qh)
3585                temp |= CMD_ASE;
3586        if (oxu->periodic_sched)
3587                temp |= CMD_PSE;
3588        if (temp) {
3589                oxu->command |= temp;
3590                writel(oxu->command, &oxu->regs->command);
3591        }
3592
3593        oxu->next_statechange = jiffies + msecs_to_jiffies(5);
3594        hcd->state = HC_STATE_RUNNING;
3595
3596        /* Now we can safely re-enable irqs */
3597        writel(INTR_MASK, &oxu->regs->intr_enable);
3598
3599        spin_unlock_irq(&oxu->lock);
3600        return 0;
3601}
3602
3603#else
3604
3605static int oxu_bus_suspend(struct usb_hcd *hcd)
3606{
3607        return 0;
3608}
3609
3610static int oxu_bus_resume(struct usb_hcd *hcd)
3611{
3612        return 0;
3613}
3614
3615#endif  /* CONFIG_PM */
3616
3617static const struct hc_driver oxu_hc_driver = {
3618        .description =          "oxu210hp_hcd",
3619        .product_desc =         "oxu210hp HCD",
3620        .hcd_priv_size =        sizeof(struct oxu_hcd),
3621
3622        /*
3623         * Generic hardware linkage
3624         */
3625        .irq =                  oxu_irq,
3626        .flags =                HCD_MEMORY | HCD_USB2,
3627
3628        /*
3629         * Basic lifecycle operations
3630         */
3631        .reset =                oxu_reset,
3632        .start =                oxu_run,
3633        .stop =                 oxu_stop,
3634        .shutdown =             oxu_shutdown,
3635
3636        /*
3637         * Managing i/o requests and associated device resources
3638         */
3639        .urb_enqueue =          oxu_urb_enqueue,
3640        .urb_dequeue =          oxu_urb_dequeue,
3641        .endpoint_disable =     oxu_endpoint_disable,
3642
3643        /*
3644         * Scheduling support
3645         */
3646        .get_frame_number =     oxu_get_frame,
3647
3648        /*
3649         * Root hub support
3650         */
3651        .hub_status_data =      oxu_hub_status_data,
3652        .hub_control =          oxu_hub_control,
3653        .bus_suspend =          oxu_bus_suspend,
3654        .bus_resume =           oxu_bus_resume,
3655};
3656
3657/*
3658 * Module stuff
3659 */
3660
3661static void oxu_configuration(struct platform_device *pdev, void *base)
3662{
3663        u32 tmp;
3664
3665        /* Initialize top level registers.
3666         * First write ever
3667         */
3668        oxu_writel(base, OXU_HOSTIFCONFIG, 0x0000037D);
3669        oxu_writel(base, OXU_SOFTRESET, OXU_SRESET);
3670        oxu_writel(base, OXU_HOSTIFCONFIG, 0x0000037D);
3671
3672        tmp = oxu_readl(base, OXU_PIOBURSTREADCTRL);
3673        oxu_writel(base, OXU_PIOBURSTREADCTRL, tmp | 0x0040);
3674
3675        oxu_writel(base, OXU_ASO, OXU_SPHPOEN | OXU_OVRCCURPUPDEN |
3676                                        OXU_COMPARATOR | OXU_ASO_OP);
3677
3678        tmp = oxu_readl(base, OXU_CLKCTRL_SET);
3679        oxu_writel(base, OXU_CLKCTRL_SET, tmp | OXU_SYSCLKEN | OXU_USBOTGCLKEN);
3680
3681        /* Clear all top interrupt enable */
3682        oxu_writel(base, OXU_CHIPIRQEN_CLR, 0xff);
3683
3684        /* Clear all top interrupt status */
3685        oxu_writel(base, OXU_CHIPIRQSTATUS, 0xff);
3686
3687        /* Enable all needed top interrupt except OTG SPH core */
3688        oxu_writel(base, OXU_CHIPIRQEN_SET, OXU_USBSPHLPWUI | OXU_USBOTGLPWUI);
3689}
3690
3691static int oxu_verify_id(struct platform_device *pdev, void *base)
3692{
3693        u32 id;
3694        static const char * const bo[] = {
3695                "reserved",
3696                "128-pin LQFP",
3697                "84-pin TFBGA",
3698                "reserved",
3699        };
3700
3701        /* Read controller signature register to find a match */
3702        id = oxu_readl(base, OXU_DEVICEID);
3703        dev_info(&pdev->dev, "device ID %x\n", id);
3704        if ((id & OXU_REV_MASK) != (OXU_REV_2100 << OXU_REV_SHIFT))
3705                return -1;
3706
3707        dev_info(&pdev->dev, "found device %x %s (%04x:%04x)\n",
3708                id >> OXU_REV_SHIFT,
3709                bo[(id & OXU_BO_MASK) >> OXU_BO_SHIFT],
3710                (id & OXU_MAJ_REV_MASK) >> OXU_MAJ_REV_SHIFT,
3711                (id & OXU_MIN_REV_MASK) >> OXU_MIN_REV_SHIFT);
3712
3713        return 0;
3714}
3715
3716static const struct hc_driver oxu_hc_driver;
3717static struct usb_hcd *oxu_create(struct platform_device *pdev,
3718                                unsigned long memstart, unsigned long memlen,
3719                                void *base, int irq, int otg)
3720{
3721        struct device *dev = &pdev->dev;
3722
3723        struct usb_hcd *hcd;
3724        struct oxu_hcd *oxu;
3725        int ret;
3726
3727        /* Set endian mode and host mode */
3728        oxu_writel(base + (otg ? OXU_OTG_CORE_OFFSET : OXU_SPH_CORE_OFFSET),
3729                                OXU_USBMODE,
3730                                OXU_CM_HOST_ONLY | OXU_ES_LITTLE | OXU_VBPS);
3731
3732        hcd = usb_create_hcd(&oxu_hc_driver, dev,
3733                                otg ? "oxu210hp_otg" : "oxu210hp_sph");
3734        if (!hcd)
3735                return ERR_PTR(-ENOMEM);
3736
3737        hcd->rsrc_start = memstart;
3738        hcd->rsrc_len = memlen;
3739        hcd->regs = base;
3740        hcd->irq = irq;
3741        hcd->state = HC_STATE_HALT;
3742
3743        oxu = hcd_to_oxu(hcd);
3744        oxu->is_otg = otg;
3745
3746        ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
3747        if (ret < 0)
3748                return ERR_PTR(ret);
3749
3750        return hcd;
3751}
3752
3753static int oxu_init(struct platform_device *pdev,
3754                                unsigned long memstart, unsigned long memlen,
3755                                void *base, int irq)
3756{
3757        struct oxu_info *info = platform_get_drvdata(pdev);
3758        struct usb_hcd *hcd;
3759        int ret;
3760
3761        /* First time configuration at start up */
3762        oxu_configuration(pdev, base);
3763
3764        ret = oxu_verify_id(pdev, base);
3765        if (ret) {
3766                dev_err(&pdev->dev, "no devices found!\n");
3767                return -ENODEV;
3768        }
3769
3770        /* Create the OTG controller */
3771        hcd = oxu_create(pdev, memstart, memlen, base, irq, 1);
3772        if (IS_ERR(hcd)) {
3773                dev_err(&pdev->dev, "cannot create OTG controller!\n");
3774                ret = PTR_ERR(hcd);
3775                goto error_create_otg;
3776        }
3777        info->hcd[0] = hcd;
3778
3779        /* Create the SPH host controller */
3780        hcd = oxu_create(pdev, memstart, memlen, base, irq, 0);
3781        if (IS_ERR(hcd)) {
3782                dev_err(&pdev->dev, "cannot create SPH controller!\n");
3783                ret = PTR_ERR(hcd);
3784                goto error_create_sph;
3785        }
3786        info->hcd[1] = hcd;
3787
3788        oxu_writel(base, OXU_CHIPIRQEN_SET,
3789                oxu_readl(base, OXU_CHIPIRQEN_SET) | 3);
3790
3791        return 0;
3792
3793error_create_sph:
3794        usb_remove_hcd(info->hcd[0]);
3795        usb_put_hcd(info->hcd[0]);
3796
3797error_create_otg:
3798        return ret;
3799}
3800
3801static int oxu_drv_probe(struct platform_device *pdev)
3802{
3803        struct resource *res;
3804        void *base;
3805        unsigned long memstart, memlen;
3806        int irq, ret;
3807        struct oxu_info *info;
3808
3809        if (usb_disabled())
3810                return -ENODEV;
3811
3812        /*
3813         * Get the platform resources
3814         */
3815        res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
3816        if (!res) {
3817                dev_err(&pdev->dev,
3818                        "no IRQ! Check %s setup!\n", dev_name(&pdev->dev));
3819                return -ENODEV;
3820        }
3821        irq = res->start;
3822        dev_dbg(&pdev->dev, "IRQ resource %d\n", irq);
3823
3824        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
3825        if (!res) {
3826                dev_err(&pdev->dev, "no registers address! Check %s setup!\n",
3827                        dev_name(&pdev->dev));
3828                return -ENODEV;
3829        }
3830        memstart = res->start;
3831        memlen = resource_size(res);
3832        dev_dbg(&pdev->dev, "MEM resource %lx-%lx\n", memstart, memlen);
3833        if (!request_mem_region(memstart, memlen,
3834                                oxu_hc_driver.description)) {
3835                dev_dbg(&pdev->dev, "memory area already in use\n");
3836                return -EBUSY;
3837        }
3838
3839        ret = irq_set_irq_type(irq, IRQF_TRIGGER_FALLING);
3840        if (ret) {
3841                dev_err(&pdev->dev, "error setting irq type\n");
3842                ret = -EFAULT;
3843                goto error_set_irq_type;
3844        }
3845
3846        base = ioremap(memstart, memlen);
3847        if (!base) {
3848                dev_dbg(&pdev->dev, "error mapping memory\n");
3849                ret = -EFAULT;
3850                goto error_ioremap;
3851        }
3852
3853        /* Allocate a driver data struct to hold useful info for both
3854         * SPH & OTG devices
3855         */
3856        info = kzalloc(sizeof(struct oxu_info), GFP_KERNEL);
3857        if (!info) {
3858                dev_dbg(&pdev->dev, "error allocating memory\n");
3859                ret = -EFAULT;
3860                goto error_alloc;
3861        }
3862        platform_set_drvdata(pdev, info);
3863
3864        ret = oxu_init(pdev, memstart, memlen, base, irq);
3865        if (ret < 0) {
3866                dev_dbg(&pdev->dev, "cannot init USB devices\n");
3867                goto error_init;
3868        }
3869
3870        dev_info(&pdev->dev, "devices enabled and running\n");
3871        platform_set_drvdata(pdev, info);
3872
3873        return 0;
3874
3875error_init:
3876        kfree(info);
3877        platform_set_drvdata(pdev, NULL);
3878
3879error_alloc:
3880        iounmap(base);
3881
3882error_set_irq_type:
3883error_ioremap:
3884        release_mem_region(memstart, memlen);
3885
3886        dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret);
3887        return ret;
3888}
3889
3890static void oxu_remove(struct platform_device *pdev, struct usb_hcd *hcd)
3891{
3892        usb_remove_hcd(hcd);
3893        usb_put_hcd(hcd);
3894}
3895
3896static int oxu_drv_remove(struct platform_device *pdev)
3897{
3898        struct oxu_info *info = platform_get_drvdata(pdev);
3899        unsigned long memstart = info->hcd[0]->rsrc_start,
3900                        memlen = info->hcd[0]->rsrc_len;
3901        void *base = info->hcd[0]->regs;
3902
3903        oxu_remove(pdev, info->hcd[0]);
3904        oxu_remove(pdev, info->hcd[1]);
3905
3906        iounmap(base);
3907        release_mem_region(memstart, memlen);
3908
3909        kfree(info);
3910        platform_set_drvdata(pdev, NULL);
3911
3912        return 0;
3913}
3914
3915static void oxu_drv_shutdown(struct platform_device *pdev)
3916{
3917        oxu_drv_remove(pdev);
3918}
3919
3920#if 0
3921/* FIXME: TODO */
3922static int oxu_drv_suspend(struct device *dev)
3923{
3924        struct platform_device *pdev = to_platform_device(dev);
3925        struct usb_hcd *hcd = dev_get_drvdata(dev);
3926
3927        return 0;
3928}
3929
3930static int oxu_drv_resume(struct device *dev)
3931{
3932        struct platform_device *pdev = to_platform_device(dev);
3933        struct usb_hcd *hcd = dev_get_drvdata(dev);
3934
3935        return 0;
3936}
3937#else
3938#define oxu_drv_suspend NULL
3939#define oxu_drv_resume  NULL
3940#endif
3941
3942static struct platform_driver oxu_driver = {
3943        .probe          = oxu_drv_probe,
3944        .remove         = oxu_drv_remove,
3945        .shutdown       = oxu_drv_shutdown,
3946        .suspend        = oxu_drv_suspend,
3947        .resume         = oxu_drv_resume,
3948        .driver = {
3949                .name = "oxu210hp-hcd",
3950                .bus = &platform_bus_type
3951        }
3952};
3953
3954module_platform_driver(oxu_driver);
3955
3956MODULE_DESCRIPTION("Oxford OXU210HP HCD driver - ver. " DRIVER_VERSION);
3957MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
3958MODULE_LICENSE("GPL");
3959