linux/drivers/usb/gadget/udc/s3c-hsudc.c
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   1/* linux/drivers/usb/gadget/s3c-hsudc.c
   2 *
   3 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
   4 *              http://www.samsung.com/
   5 *
   6 * S3C24XX USB 2.0 High-speed USB controller gadget driver
   7 *
   8 * The S3C24XX USB 2.0 high-speed USB controller supports upto 9 endpoints.
   9 * Each endpoint can be configured as either in or out endpoint. Endpoints
  10 * can be configured for Bulk or Interrupt transfer mode.
  11 *
  12 * This program is free software; you can redistribute it and/or modify
  13 * it under the terms of the GNU General Public License version 2 as
  14 * published by the Free Software Foundation.
  15*/
  16
  17#include <linux/kernel.h>
  18#include <linux/module.h>
  19#include <linux/spinlock.h>
  20#include <linux/interrupt.h>
  21#include <linux/platform_device.h>
  22#include <linux/dma-mapping.h>
  23#include <linux/delay.h>
  24#include <linux/io.h>
  25#include <linux/slab.h>
  26#include <linux/clk.h>
  27#include <linux/err.h>
  28#include <linux/usb/ch9.h>
  29#include <linux/usb/gadget.h>
  30#include <linux/usb/otg.h>
  31#include <linux/prefetch.h>
  32#include <linux/platform_data/s3c-hsudc.h>
  33#include <linux/regulator/consumer.h>
  34#include <linux/pm_runtime.h>
  35
  36#include <mach/regs-s3c2443-clock.h>
  37
  38#define S3C_HSUDC_REG(x)        (x)
  39
  40/* Non-Indexed Registers */
  41#define S3C_IR                          S3C_HSUDC_REG(0x00) /* Index Register */
  42#define S3C_EIR                         S3C_HSUDC_REG(0x04) /* EP Intr Status */
  43#define S3C_EIR_EP0                     (1<<0)
  44#define S3C_EIER                        S3C_HSUDC_REG(0x08) /* EP Intr Enable */
  45#define S3C_FAR                         S3C_HSUDC_REG(0x0c) /* Gadget Address */
  46#define S3C_FNR                         S3C_HSUDC_REG(0x10) /* Frame Number */
  47#define S3C_EDR                         S3C_HSUDC_REG(0x14) /* EP Direction */
  48#define S3C_TR                          S3C_HSUDC_REG(0x18) /* Test Register */
  49#define S3C_SSR                         S3C_HSUDC_REG(0x1c) /* System Status */
  50#define S3C_SSR_DTZIEN_EN               (0xff8f)
  51#define S3C_SSR_ERR                     (0xff80)
  52#define S3C_SSR_VBUSON                  (1 << 8)
  53#define S3C_SSR_HSP                     (1 << 4)
  54#define S3C_SSR_SDE                     (1 << 3)
  55#define S3C_SSR_RESUME                  (1 << 2)
  56#define S3C_SSR_SUSPEND                 (1 << 1)
  57#define S3C_SSR_RESET                   (1 << 0)
  58#define S3C_SCR                         S3C_HSUDC_REG(0x20) /* System Control */
  59#define S3C_SCR_DTZIEN_EN               (1 << 14)
  60#define S3C_SCR_RRD_EN                  (1 << 5)
  61#define S3C_SCR_SUS_EN                  (1 << 1)
  62#define S3C_SCR_RST_EN                  (1 << 0)
  63#define S3C_EP0SR                       S3C_HSUDC_REG(0x24) /* EP0 Status */
  64#define S3C_EP0SR_EP0_LWO               (1 << 6)
  65#define S3C_EP0SR_STALL                 (1 << 4)
  66#define S3C_EP0SR_TX_SUCCESS            (1 << 1)
  67#define S3C_EP0SR_RX_SUCCESS            (1 << 0)
  68#define S3C_EP0CR                       S3C_HSUDC_REG(0x28) /* EP0 Control */
  69#define S3C_BR(_x)                      S3C_HSUDC_REG(0x60 + (_x * 4))
  70
  71/* Indexed Registers */
  72#define S3C_ESR                         S3C_HSUDC_REG(0x2c) /* EPn Status */
  73#define S3C_ESR_FLUSH                   (1 << 6)
  74#define S3C_ESR_STALL                   (1 << 5)
  75#define S3C_ESR_LWO                     (1 << 4)
  76#define S3C_ESR_PSIF_ONE                (1 << 2)
  77#define S3C_ESR_PSIF_TWO                (2 << 2)
  78#define S3C_ESR_TX_SUCCESS              (1 << 1)
  79#define S3C_ESR_RX_SUCCESS              (1 << 0)
  80#define S3C_ECR                         S3C_HSUDC_REG(0x30) /* EPn Control */
  81#define S3C_ECR_DUEN                    (1 << 7)
  82#define S3C_ECR_FLUSH                   (1 << 6)
  83#define S3C_ECR_STALL                   (1 << 1)
  84#define S3C_ECR_IEMS                    (1 << 0)
  85#define S3C_BRCR                        S3C_HSUDC_REG(0x34) /* Read Count */
  86#define S3C_BWCR                        S3C_HSUDC_REG(0x38) /* Write Count */
  87#define S3C_MPR                         S3C_HSUDC_REG(0x3c) /* Max Pkt Size */
  88
  89#define WAIT_FOR_SETUP                  (0)
  90#define DATA_STATE_XMIT                 (1)
  91#define DATA_STATE_RECV                 (2)
  92
  93static const char * const s3c_hsudc_supply_names[] = {
  94        "vdda",         /* analog phy supply, 3.3V */
  95        "vddi",         /* digital phy supply, 1.2V */
  96        "vddosc",       /* oscillator supply, 1.8V - 3.3V */
  97};
  98
  99/**
 100 * struct s3c_hsudc_ep - Endpoint representation used by driver.
 101 * @ep: USB gadget layer representation of device endpoint.
 102 * @name: Endpoint name (as required by ep autoconfiguration).
 103 * @dev: Reference to the device controller to which this EP belongs.
 104 * @desc: Endpoint descriptor obtained from the gadget driver.
 105 * @queue: Transfer request queue for the endpoint.
 106 * @stopped: Maintains state of endpoint, set if EP is halted.
 107 * @bEndpointAddress: EP address (including direction bit).
 108 * @fifo: Base address of EP FIFO.
 109 */
 110struct s3c_hsudc_ep {
 111        struct usb_ep ep;
 112        char name[20];
 113        struct s3c_hsudc *dev;
 114        struct list_head queue;
 115        u8 stopped;
 116        u8 wedge;
 117        u8 bEndpointAddress;
 118        void __iomem *fifo;
 119};
 120
 121/**
 122 * struct s3c_hsudc_req - Driver encapsulation of USB gadget transfer request.
 123 * @req: Reference to USB gadget transfer request.
 124 * @queue: Used for inserting this request to the endpoint request queue.
 125 */
 126struct s3c_hsudc_req {
 127        struct usb_request req;
 128        struct list_head queue;
 129};
 130
 131/**
 132 * struct s3c_hsudc - Driver's abstraction of the device controller.
 133 * @gadget: Instance of usb_gadget which is referenced by gadget driver.
 134 * @driver: Reference to currenty active gadget driver.
 135 * @dev: The device reference used by probe function.
 136 * @lock: Lock to synchronize the usage of Endpoints (EP's are indexed).
 137 * @regs: Remapped base address of controller's register space.
 138 * irq: IRQ number used by the controller.
 139 * uclk: Reference to the controller clock.
 140 * ep0state: Current state of EP0.
 141 * ep: List of endpoints supported by the controller.
 142 */
 143struct s3c_hsudc {
 144        struct usb_gadget gadget;
 145        struct usb_gadget_driver *driver;
 146        struct device *dev;
 147        struct s3c24xx_hsudc_platdata *pd;
 148        struct usb_phy *transceiver;
 149        struct regulator_bulk_data supplies[ARRAY_SIZE(s3c_hsudc_supply_names)];
 150        spinlock_t lock;
 151        void __iomem *regs;
 152        int irq;
 153        struct clk *uclk;
 154        int ep0state;
 155        struct s3c_hsudc_ep ep[];
 156};
 157
 158#define ep_maxpacket(_ep)       ((_ep)->ep.maxpacket)
 159#define ep_is_in(_ep)           ((_ep)->bEndpointAddress & USB_DIR_IN)
 160#define ep_index(_ep)           ((_ep)->bEndpointAddress & \
 161                                        USB_ENDPOINT_NUMBER_MASK)
 162
 163static const char driver_name[] = "s3c-udc";
 164static const char ep0name[] = "ep0-control";
 165
 166static inline struct s3c_hsudc_req *our_req(struct usb_request *req)
 167{
 168        return container_of(req, struct s3c_hsudc_req, req);
 169}
 170
 171static inline struct s3c_hsudc_ep *our_ep(struct usb_ep *ep)
 172{
 173        return container_of(ep, struct s3c_hsudc_ep, ep);
 174}
 175
 176static inline struct s3c_hsudc *to_hsudc(struct usb_gadget *gadget)
 177{
 178        return container_of(gadget, struct s3c_hsudc, gadget);
 179}
 180
 181static inline void set_index(struct s3c_hsudc *hsudc, int ep_addr)
 182{
 183        ep_addr &= USB_ENDPOINT_NUMBER_MASK;
 184        writel(ep_addr, hsudc->regs + S3C_IR);
 185}
 186
 187static inline void __orr32(void __iomem *ptr, u32 val)
 188{
 189        writel(readl(ptr) | val, ptr);
 190}
 191
 192static void s3c_hsudc_init_phy(void)
 193{
 194        u32 cfg;
 195
 196        cfg = readl(S3C2443_PWRCFG) | S3C2443_PWRCFG_USBPHY;
 197        writel(cfg, S3C2443_PWRCFG);
 198
 199        cfg = readl(S3C2443_URSTCON);
 200        cfg |= (S3C2443_URSTCON_FUNCRST | S3C2443_URSTCON_PHYRST);
 201        writel(cfg, S3C2443_URSTCON);
 202        mdelay(1);
 203
 204        cfg = readl(S3C2443_URSTCON);
 205        cfg &= ~(S3C2443_URSTCON_FUNCRST | S3C2443_URSTCON_PHYRST);
 206        writel(cfg, S3C2443_URSTCON);
 207
 208        cfg = readl(S3C2443_PHYCTRL);
 209        cfg &= ~(S3C2443_PHYCTRL_CLKSEL | S3C2443_PHYCTRL_DSPORT);
 210        cfg |= (S3C2443_PHYCTRL_EXTCLK | S3C2443_PHYCTRL_PLLSEL);
 211        writel(cfg, S3C2443_PHYCTRL);
 212
 213        cfg = readl(S3C2443_PHYPWR);
 214        cfg &= ~(S3C2443_PHYPWR_FSUSPEND | S3C2443_PHYPWR_PLL_PWRDN |
 215                S3C2443_PHYPWR_XO_ON | S3C2443_PHYPWR_PLL_REFCLK |
 216                S3C2443_PHYPWR_ANALOG_PD);
 217        cfg |= S3C2443_PHYPWR_COMMON_ON;
 218        writel(cfg, S3C2443_PHYPWR);
 219
 220        cfg = readl(S3C2443_UCLKCON);
 221        cfg |= (S3C2443_UCLKCON_DETECT_VBUS | S3C2443_UCLKCON_FUNC_CLKEN |
 222                S3C2443_UCLKCON_TCLKEN);
 223        writel(cfg, S3C2443_UCLKCON);
 224}
 225
 226static void s3c_hsudc_uninit_phy(void)
 227{
 228        u32 cfg;
 229
 230        cfg = readl(S3C2443_PWRCFG) & ~S3C2443_PWRCFG_USBPHY;
 231        writel(cfg, S3C2443_PWRCFG);
 232
 233        writel(S3C2443_PHYPWR_FSUSPEND, S3C2443_PHYPWR);
 234
 235        cfg = readl(S3C2443_UCLKCON) & ~S3C2443_UCLKCON_FUNC_CLKEN;
 236        writel(cfg, S3C2443_UCLKCON);
 237}
 238
 239/**
 240 * s3c_hsudc_complete_request - Complete a transfer request.
 241 * @hsep: Endpoint to which the request belongs.
 242 * @hsreq: Transfer request to be completed.
 243 * @status: Transfer completion status for the transfer request.
 244 */
 245static void s3c_hsudc_complete_request(struct s3c_hsudc_ep *hsep,
 246                                struct s3c_hsudc_req *hsreq, int status)
 247{
 248        unsigned int stopped = hsep->stopped;
 249        struct s3c_hsudc *hsudc = hsep->dev;
 250
 251        list_del_init(&hsreq->queue);
 252        hsreq->req.status = status;
 253
 254        if (!ep_index(hsep)) {
 255                hsudc->ep0state = WAIT_FOR_SETUP;
 256                hsep->bEndpointAddress &= ~USB_DIR_IN;
 257        }
 258
 259        hsep->stopped = 1;
 260        spin_unlock(&hsudc->lock);
 261        usb_gadget_giveback_request(&hsep->ep, &hsreq->req);
 262        spin_lock(&hsudc->lock);
 263        hsep->stopped = stopped;
 264}
 265
 266/**
 267 * s3c_hsudc_nuke_ep - Terminate all requests queued for a endpoint.
 268 * @hsep: Endpoint for which queued requests have to be terminated.
 269 * @status: Transfer completion status for the transfer request.
 270 */
 271static void s3c_hsudc_nuke_ep(struct s3c_hsudc_ep *hsep, int status)
 272{
 273        struct s3c_hsudc_req *hsreq;
 274
 275        while (!list_empty(&hsep->queue)) {
 276                hsreq = list_entry(hsep->queue.next,
 277                                struct s3c_hsudc_req, queue);
 278                s3c_hsudc_complete_request(hsep, hsreq, status);
 279        }
 280}
 281
 282/**
 283 * s3c_hsudc_stop_activity - Stop activity on all endpoints.
 284 * @hsudc: Device controller for which EP activity is to be stopped.
 285 *
 286 * All the endpoints are stopped and any pending transfer requests if any on
 287 * the endpoint are terminated.
 288 */
 289static void s3c_hsudc_stop_activity(struct s3c_hsudc *hsudc)
 290{
 291        struct s3c_hsudc_ep *hsep;
 292        int epnum;
 293
 294        hsudc->gadget.speed = USB_SPEED_UNKNOWN;
 295
 296        for (epnum = 0; epnum < hsudc->pd->epnum; epnum++) {
 297                hsep = &hsudc->ep[epnum];
 298                hsep->stopped = 1;
 299                s3c_hsudc_nuke_ep(hsep, -ESHUTDOWN);
 300        }
 301}
 302
 303/**
 304 * s3c_hsudc_read_setup_pkt - Read the received setup packet from EP0 fifo.
 305 * @hsudc: Device controller from which setup packet is to be read.
 306 * @buf: The buffer into which the setup packet is read.
 307 *
 308 * The setup packet received in the EP0 fifo is read and stored into a
 309 * given buffer address.
 310 */
 311
 312static void s3c_hsudc_read_setup_pkt(struct s3c_hsudc *hsudc, u16 *buf)
 313{
 314        int count;
 315
 316        count = readl(hsudc->regs + S3C_BRCR);
 317        while (count--)
 318                *buf++ = (u16)readl(hsudc->regs + S3C_BR(0));
 319
 320        writel(S3C_EP0SR_RX_SUCCESS, hsudc->regs + S3C_EP0SR);
 321}
 322
 323/**
 324 * s3c_hsudc_write_fifo - Write next chunk of transfer data to EP fifo.
 325 * @hsep: Endpoint to which the data is to be written.
 326 * @hsreq: Transfer request from which the next chunk of data is written.
 327 *
 328 * Write the next chunk of data from a transfer request to the endpoint FIFO.
 329 * If the transfer request completes, 1 is returned, otherwise 0 is returned.
 330 */
 331static int s3c_hsudc_write_fifo(struct s3c_hsudc_ep *hsep,
 332                                struct s3c_hsudc_req *hsreq)
 333{
 334        u16 *buf;
 335        u32 max = ep_maxpacket(hsep);
 336        u32 count, length;
 337        bool is_last;
 338        void __iomem *fifo = hsep->fifo;
 339
 340        buf = hsreq->req.buf + hsreq->req.actual;
 341        prefetch(buf);
 342
 343        length = hsreq->req.length - hsreq->req.actual;
 344        length = min(length, max);
 345        hsreq->req.actual += length;
 346
 347        writel(length, hsep->dev->regs + S3C_BWCR);
 348        for (count = 0; count < length; count += 2)
 349                writel(*buf++, fifo);
 350
 351        if (count != max) {
 352                is_last = true;
 353        } else {
 354                if (hsreq->req.length != hsreq->req.actual || hsreq->req.zero)
 355                        is_last = false;
 356                else
 357                        is_last = true;
 358        }
 359
 360        if (is_last) {
 361                s3c_hsudc_complete_request(hsep, hsreq, 0);
 362                return 1;
 363        }
 364
 365        return 0;
 366}
 367
 368/**
 369 * s3c_hsudc_read_fifo - Read the next chunk of data from EP fifo.
 370 * @hsep: Endpoint from which the data is to be read.
 371 * @hsreq: Transfer request to which the next chunk of data read is written.
 372 *
 373 * Read the next chunk of data from the endpoint FIFO and a write it to the
 374 * transfer request buffer. If the transfer request completes, 1 is returned,
 375 * otherwise 0 is returned.
 376 */
 377static int s3c_hsudc_read_fifo(struct s3c_hsudc_ep *hsep,
 378                                struct s3c_hsudc_req *hsreq)
 379{
 380        struct s3c_hsudc *hsudc = hsep->dev;
 381        u32 csr, offset;
 382        u16 *buf, word;
 383        u32 buflen, rcnt, rlen;
 384        void __iomem *fifo = hsep->fifo;
 385        u32 is_short = 0;
 386
 387        offset = (ep_index(hsep)) ? S3C_ESR : S3C_EP0SR;
 388        csr = readl(hsudc->regs + offset);
 389        if (!(csr & S3C_ESR_RX_SUCCESS))
 390                return -EINVAL;
 391
 392        buf = hsreq->req.buf + hsreq->req.actual;
 393        prefetchw(buf);
 394        buflen = hsreq->req.length - hsreq->req.actual;
 395
 396        rcnt = readl(hsudc->regs + S3C_BRCR);
 397        rlen = (csr & S3C_ESR_LWO) ? (rcnt * 2 - 1) : (rcnt * 2);
 398
 399        hsreq->req.actual += min(rlen, buflen);
 400        is_short = (rlen < hsep->ep.maxpacket);
 401
 402        while (rcnt-- != 0) {
 403                word = (u16)readl(fifo);
 404                if (buflen) {
 405                        *buf++ = word;
 406                        buflen--;
 407                } else {
 408                        hsreq->req.status = -EOVERFLOW;
 409                }
 410        }
 411
 412        writel(S3C_ESR_RX_SUCCESS, hsudc->regs + offset);
 413
 414        if (is_short || hsreq->req.actual == hsreq->req.length) {
 415                s3c_hsudc_complete_request(hsep, hsreq, 0);
 416                return 1;
 417        }
 418
 419        return 0;
 420}
 421
 422/**
 423 * s3c_hsudc_epin_intr - Handle in-endpoint interrupt.
 424 * @hsudc - Device controller for which the interrupt is to be handled.
 425 * @ep_idx - Endpoint number on which an interrupt is pending.
 426 *
 427 * Handles interrupt for a in-endpoint. The interrupts that are handled are
 428 * stall and data transmit complete interrupt.
 429 */
 430static void s3c_hsudc_epin_intr(struct s3c_hsudc *hsudc, u32 ep_idx)
 431{
 432        struct s3c_hsudc_ep *hsep = &hsudc->ep[ep_idx];
 433        struct s3c_hsudc_req *hsreq;
 434        u32 csr;
 435
 436        csr = readl(hsudc->regs + S3C_ESR);
 437        if (csr & S3C_ESR_STALL) {
 438                writel(S3C_ESR_STALL, hsudc->regs + S3C_ESR);
 439                return;
 440        }
 441
 442        if (csr & S3C_ESR_TX_SUCCESS) {
 443                writel(S3C_ESR_TX_SUCCESS, hsudc->regs + S3C_ESR);
 444                if (list_empty(&hsep->queue))
 445                        return;
 446
 447                hsreq = list_entry(hsep->queue.next,
 448                                struct s3c_hsudc_req, queue);
 449                if ((s3c_hsudc_write_fifo(hsep, hsreq) == 0) &&
 450                                (csr & S3C_ESR_PSIF_TWO))
 451                        s3c_hsudc_write_fifo(hsep, hsreq);
 452        }
 453}
 454
 455/**
 456 * s3c_hsudc_epout_intr - Handle out-endpoint interrupt.
 457 * @hsudc - Device controller for which the interrupt is to be handled.
 458 * @ep_idx - Endpoint number on which an interrupt is pending.
 459 *
 460 * Handles interrupt for a out-endpoint. The interrupts that are handled are
 461 * stall, flush and data ready interrupt.
 462 */
 463static void s3c_hsudc_epout_intr(struct s3c_hsudc *hsudc, u32 ep_idx)
 464{
 465        struct s3c_hsudc_ep *hsep = &hsudc->ep[ep_idx];
 466        struct s3c_hsudc_req *hsreq;
 467        u32 csr;
 468
 469        csr = readl(hsudc->regs + S3C_ESR);
 470        if (csr & S3C_ESR_STALL) {
 471                writel(S3C_ESR_STALL, hsudc->regs + S3C_ESR);
 472                return;
 473        }
 474
 475        if (csr & S3C_ESR_FLUSH) {
 476                __orr32(hsudc->regs + S3C_ECR, S3C_ECR_FLUSH);
 477                return;
 478        }
 479
 480        if (csr & S3C_ESR_RX_SUCCESS) {
 481                if (list_empty(&hsep->queue))
 482                        return;
 483
 484                hsreq = list_entry(hsep->queue.next,
 485                                struct s3c_hsudc_req, queue);
 486                if (((s3c_hsudc_read_fifo(hsep, hsreq)) == 0) &&
 487                                (csr & S3C_ESR_PSIF_TWO))
 488                        s3c_hsudc_read_fifo(hsep, hsreq);
 489        }
 490}
 491
 492/** s3c_hsudc_set_halt - Set or clear a endpoint halt.
 493 * @_ep: Endpoint on which halt has to be set or cleared.
 494 * @value: 1 for setting halt on endpoint, 0 to clear halt.
 495 *
 496 * Set or clear endpoint halt. If halt is set, the endpoint is stopped.
 497 * If halt is cleared, for in-endpoints, if there are any pending
 498 * transfer requests, transfers are started.
 499 */
 500static int s3c_hsudc_set_halt(struct usb_ep *_ep, int value)
 501{
 502        struct s3c_hsudc_ep *hsep = our_ep(_ep);
 503        struct s3c_hsudc *hsudc = hsep->dev;
 504        struct s3c_hsudc_req *hsreq;
 505        unsigned long irqflags;
 506        u32 ecr;
 507        u32 offset;
 508
 509        if (value && ep_is_in(hsep) && !list_empty(&hsep->queue))
 510                return -EAGAIN;
 511
 512        spin_lock_irqsave(&hsudc->lock, irqflags);
 513        set_index(hsudc, ep_index(hsep));
 514        offset = (ep_index(hsep)) ? S3C_ECR : S3C_EP0CR;
 515        ecr = readl(hsudc->regs + offset);
 516
 517        if (value) {
 518                ecr |= S3C_ECR_STALL;
 519                if (ep_index(hsep))
 520                        ecr |= S3C_ECR_FLUSH;
 521                hsep->stopped = 1;
 522        } else {
 523                ecr &= ~S3C_ECR_STALL;
 524                hsep->stopped = hsep->wedge = 0;
 525        }
 526        writel(ecr, hsudc->regs + offset);
 527
 528        if (ep_is_in(hsep) && !list_empty(&hsep->queue) && !value) {
 529                hsreq = list_entry(hsep->queue.next,
 530                        struct s3c_hsudc_req, queue);
 531                if (hsreq)
 532                        s3c_hsudc_write_fifo(hsep, hsreq);
 533        }
 534
 535        spin_unlock_irqrestore(&hsudc->lock, irqflags);
 536        return 0;
 537}
 538
 539/** s3c_hsudc_set_wedge - Sets the halt feature with the clear requests ignored
 540 * @_ep: Endpoint on which wedge has to be set.
 541 *
 542 * Sets the halt feature with the clear requests ignored.
 543 */
 544static int s3c_hsudc_set_wedge(struct usb_ep *_ep)
 545{
 546        struct s3c_hsudc_ep *hsep = our_ep(_ep);
 547
 548        if (!hsep)
 549                return -EINVAL;
 550
 551        hsep->wedge = 1;
 552        return usb_ep_set_halt(_ep);
 553}
 554
 555/** s3c_hsudc_handle_reqfeat - Handle set feature or clear feature requests.
 556 * @_ep: Device controller on which the set/clear feature needs to be handled.
 557 * @ctrl: Control request as received on the endpoint 0.
 558 *
 559 * Handle set feature or clear feature control requests on the control endpoint.
 560 */
 561static int s3c_hsudc_handle_reqfeat(struct s3c_hsudc *hsudc,
 562                                        struct usb_ctrlrequest *ctrl)
 563{
 564        struct s3c_hsudc_ep *hsep;
 565        bool set = (ctrl->bRequest == USB_REQ_SET_FEATURE);
 566        u8 ep_num = ctrl->wIndex & USB_ENDPOINT_NUMBER_MASK;
 567
 568        if (ctrl->bRequestType == USB_RECIP_ENDPOINT) {
 569                hsep = &hsudc->ep[ep_num];
 570                switch (le16_to_cpu(ctrl->wValue)) {
 571                case USB_ENDPOINT_HALT:
 572                        if (set || !hsep->wedge)
 573                                s3c_hsudc_set_halt(&hsep->ep, set);
 574                        return 0;
 575                }
 576        }
 577
 578        return -ENOENT;
 579}
 580
 581/**
 582 * s3c_hsudc_process_req_status - Handle get status control request.
 583 * @hsudc: Device controller on which get status request has be handled.
 584 * @ctrl: Control request as received on the endpoint 0.
 585 *
 586 * Handle get status control request received on control endpoint.
 587 */
 588static void s3c_hsudc_process_req_status(struct s3c_hsudc *hsudc,
 589                                        struct usb_ctrlrequest *ctrl)
 590{
 591        struct s3c_hsudc_ep *hsep0 = &hsudc->ep[0];
 592        struct s3c_hsudc_req hsreq;
 593        struct s3c_hsudc_ep *hsep;
 594        __le16 reply;
 595        u8 epnum;
 596
 597        switch (ctrl->bRequestType & USB_RECIP_MASK) {
 598        case USB_RECIP_DEVICE:
 599                reply = cpu_to_le16(0);
 600                break;
 601
 602        case USB_RECIP_INTERFACE:
 603                reply = cpu_to_le16(0);
 604                break;
 605
 606        case USB_RECIP_ENDPOINT:
 607                epnum = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
 608                hsep = &hsudc->ep[epnum];
 609                reply = cpu_to_le16(hsep->stopped ? 1 : 0);
 610                break;
 611        }
 612
 613        INIT_LIST_HEAD(&hsreq.queue);
 614        hsreq.req.length = 2;
 615        hsreq.req.buf = &reply;
 616        hsreq.req.actual = 0;
 617        hsreq.req.complete = NULL;
 618        s3c_hsudc_write_fifo(hsep0, &hsreq);
 619}
 620
 621/**
 622 * s3c_hsudc_process_setup - Process control request received on endpoint 0.
 623 * @hsudc: Device controller on which control request has been received.
 624 *
 625 * Read the control request received on endpoint 0, decode it and handle
 626 * the request.
 627 */
 628static void s3c_hsudc_process_setup(struct s3c_hsudc *hsudc)
 629{
 630        struct s3c_hsudc_ep *hsep = &hsudc->ep[0];
 631        struct usb_ctrlrequest ctrl = {0};
 632        int ret;
 633
 634        s3c_hsudc_nuke_ep(hsep, -EPROTO);
 635        s3c_hsudc_read_setup_pkt(hsudc, (u16 *)&ctrl);
 636
 637        if (ctrl.bRequestType & USB_DIR_IN) {
 638                hsep->bEndpointAddress |= USB_DIR_IN;
 639                hsudc->ep0state = DATA_STATE_XMIT;
 640        } else {
 641                hsep->bEndpointAddress &= ~USB_DIR_IN;
 642                hsudc->ep0state = DATA_STATE_RECV;
 643        }
 644
 645        switch (ctrl.bRequest) {
 646        case USB_REQ_SET_ADDRESS:
 647                if (ctrl.bRequestType != (USB_TYPE_STANDARD | USB_RECIP_DEVICE))
 648                        break;
 649                hsudc->ep0state = WAIT_FOR_SETUP;
 650                return;
 651
 652        case USB_REQ_GET_STATUS:
 653                if ((ctrl.bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD)
 654                        break;
 655                s3c_hsudc_process_req_status(hsudc, &ctrl);
 656                return;
 657
 658        case USB_REQ_SET_FEATURE:
 659        case USB_REQ_CLEAR_FEATURE:
 660                if ((ctrl.bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD)
 661                        break;
 662                s3c_hsudc_handle_reqfeat(hsudc, &ctrl);
 663                hsudc->ep0state = WAIT_FOR_SETUP;
 664                return;
 665        }
 666
 667        if (hsudc->driver) {
 668                spin_unlock(&hsudc->lock);
 669                ret = hsudc->driver->setup(&hsudc->gadget, &ctrl);
 670                spin_lock(&hsudc->lock);
 671
 672                if (ctrl.bRequest == USB_REQ_SET_CONFIGURATION) {
 673                        hsep->bEndpointAddress &= ~USB_DIR_IN;
 674                        hsudc->ep0state = WAIT_FOR_SETUP;
 675                }
 676
 677                if (ret < 0) {
 678                        dev_err(hsudc->dev, "setup failed, returned %d\n",
 679                                                ret);
 680                        s3c_hsudc_set_halt(&hsep->ep, 1);
 681                        hsudc->ep0state = WAIT_FOR_SETUP;
 682                        hsep->bEndpointAddress &= ~USB_DIR_IN;
 683                }
 684        }
 685}
 686
 687/** s3c_hsudc_handle_ep0_intr - Handle endpoint 0 interrupt.
 688 * @hsudc: Device controller on which endpoint 0 interrupt has occured.
 689 *
 690 * Handle endpoint 0 interrupt when it occurs. EP0 interrupt could occur
 691 * when a stall handshake is sent to host or data is sent/received on
 692 * endpoint 0.
 693 */
 694static void s3c_hsudc_handle_ep0_intr(struct s3c_hsudc *hsudc)
 695{
 696        struct s3c_hsudc_ep *hsep = &hsudc->ep[0];
 697        struct s3c_hsudc_req *hsreq;
 698        u32 csr = readl(hsudc->regs + S3C_EP0SR);
 699        u32 ecr;
 700
 701        if (csr & S3C_EP0SR_STALL) {
 702                ecr = readl(hsudc->regs + S3C_EP0CR);
 703                ecr &= ~(S3C_ECR_STALL | S3C_ECR_FLUSH);
 704                writel(ecr, hsudc->regs + S3C_EP0CR);
 705
 706                writel(S3C_EP0SR_STALL, hsudc->regs + S3C_EP0SR);
 707                hsep->stopped = 0;
 708
 709                s3c_hsudc_nuke_ep(hsep, -ECONNABORTED);
 710                hsudc->ep0state = WAIT_FOR_SETUP;
 711                hsep->bEndpointAddress &= ~USB_DIR_IN;
 712                return;
 713        }
 714
 715        if (csr & S3C_EP0SR_TX_SUCCESS) {
 716                writel(S3C_EP0SR_TX_SUCCESS, hsudc->regs + S3C_EP0SR);
 717                if (ep_is_in(hsep)) {
 718                        if (list_empty(&hsep->queue))
 719                                return;
 720
 721                        hsreq = list_entry(hsep->queue.next,
 722                                        struct s3c_hsudc_req, queue);
 723                        s3c_hsudc_write_fifo(hsep, hsreq);
 724                }
 725        }
 726
 727        if (csr & S3C_EP0SR_RX_SUCCESS) {
 728                if (hsudc->ep0state == WAIT_FOR_SETUP)
 729                        s3c_hsudc_process_setup(hsudc);
 730                else {
 731                        if (!ep_is_in(hsep)) {
 732                                if (list_empty(&hsep->queue))
 733                                        return;
 734                                hsreq = list_entry(hsep->queue.next,
 735                                        struct s3c_hsudc_req, queue);
 736                                s3c_hsudc_read_fifo(hsep, hsreq);
 737                        }
 738                }
 739        }
 740}
 741
 742/**
 743 * s3c_hsudc_ep_enable - Enable a endpoint.
 744 * @_ep: The endpoint to be enabled.
 745 * @desc: Endpoint descriptor.
 746 *
 747 * Enables a endpoint when called from the gadget driver. Endpoint stall if
 748 * any is cleared, transfer type is configured and endpoint interrupt is
 749 * enabled.
 750 */
 751static int s3c_hsudc_ep_enable(struct usb_ep *_ep,
 752                                const struct usb_endpoint_descriptor *desc)
 753{
 754        struct s3c_hsudc_ep *hsep;
 755        struct s3c_hsudc *hsudc;
 756        unsigned long flags;
 757        u32 ecr = 0;
 758
 759        hsep = our_ep(_ep);
 760        if (!_ep || !desc || _ep->name == ep0name
 761                || desc->bDescriptorType != USB_DT_ENDPOINT
 762                || hsep->bEndpointAddress != desc->bEndpointAddress
 763                || ep_maxpacket(hsep) < usb_endpoint_maxp(desc))
 764                return -EINVAL;
 765
 766        if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
 767                && usb_endpoint_maxp(desc) != ep_maxpacket(hsep))
 768                || !desc->wMaxPacketSize)
 769                return -ERANGE;
 770
 771        hsudc = hsep->dev;
 772        if (!hsudc->driver || hsudc->gadget.speed == USB_SPEED_UNKNOWN)
 773                return -ESHUTDOWN;
 774
 775        spin_lock_irqsave(&hsudc->lock, flags);
 776
 777        set_index(hsudc, hsep->bEndpointAddress);
 778        ecr |= ((usb_endpoint_xfer_int(desc)) ? S3C_ECR_IEMS : S3C_ECR_DUEN);
 779        writel(ecr, hsudc->regs + S3C_ECR);
 780
 781        hsep->stopped = hsep->wedge = 0;
 782        hsep->ep.desc = desc;
 783        hsep->ep.maxpacket = usb_endpoint_maxp(desc);
 784
 785        s3c_hsudc_set_halt(_ep, 0);
 786        __set_bit(ep_index(hsep), hsudc->regs + S3C_EIER);
 787
 788        spin_unlock_irqrestore(&hsudc->lock, flags);
 789        return 0;
 790}
 791
 792/**
 793 * s3c_hsudc_ep_disable - Disable a endpoint.
 794 * @_ep: The endpoint to be disabled.
 795 * @desc: Endpoint descriptor.
 796 *
 797 * Disables a endpoint when called from the gadget driver.
 798 */
 799static int s3c_hsudc_ep_disable(struct usb_ep *_ep)
 800{
 801        struct s3c_hsudc_ep *hsep = our_ep(_ep);
 802        struct s3c_hsudc *hsudc = hsep->dev;
 803        unsigned long flags;
 804
 805        if (!_ep || !hsep->ep.desc)
 806                return -EINVAL;
 807
 808        spin_lock_irqsave(&hsudc->lock, flags);
 809
 810        set_index(hsudc, hsep->bEndpointAddress);
 811        __clear_bit(ep_index(hsep), hsudc->regs + S3C_EIER);
 812
 813        s3c_hsudc_nuke_ep(hsep, -ESHUTDOWN);
 814
 815        hsep->ep.desc = NULL;
 816        hsep->stopped = 1;
 817
 818        spin_unlock_irqrestore(&hsudc->lock, flags);
 819        return 0;
 820}
 821
 822/**
 823 * s3c_hsudc_alloc_request - Allocate a new request.
 824 * @_ep: Endpoint for which request is allocated (not used).
 825 * @gfp_flags: Flags used for the allocation.
 826 *
 827 * Allocates a single transfer request structure when called from gadget driver.
 828 */
 829static struct usb_request *s3c_hsudc_alloc_request(struct usb_ep *_ep,
 830                                                gfp_t gfp_flags)
 831{
 832        struct s3c_hsudc_req *hsreq;
 833
 834        hsreq = kzalloc(sizeof(*hsreq), gfp_flags);
 835        if (!hsreq)
 836                return NULL;
 837
 838        INIT_LIST_HEAD(&hsreq->queue);
 839        return &hsreq->req;
 840}
 841
 842/**
 843 * s3c_hsudc_free_request - Deallocate a request.
 844 * @ep: Endpoint for which request is deallocated (not used).
 845 * @_req: Request to be deallocated.
 846 *
 847 * Allocates a single transfer request structure when called from gadget driver.
 848 */
 849static void s3c_hsudc_free_request(struct usb_ep *ep, struct usb_request *_req)
 850{
 851        struct s3c_hsudc_req *hsreq;
 852
 853        hsreq = our_req(_req);
 854        WARN_ON(!list_empty(&hsreq->queue));
 855        kfree(hsreq);
 856}
 857
 858/**
 859 * s3c_hsudc_queue - Queue a transfer request for the endpoint.
 860 * @_ep: Endpoint for which the request is queued.
 861 * @_req: Request to be queued.
 862 * @gfp_flags: Not used.
 863 *
 864 * Start or enqueue a request for a endpoint when called from gadget driver.
 865 */
 866static int s3c_hsudc_queue(struct usb_ep *_ep, struct usb_request *_req,
 867                        gfp_t gfp_flags)
 868{
 869        struct s3c_hsudc_req *hsreq;
 870        struct s3c_hsudc_ep *hsep;
 871        struct s3c_hsudc *hsudc;
 872        unsigned long flags;
 873        u32 offset;
 874        u32 csr;
 875
 876        hsreq = our_req(_req);
 877        if ((!_req || !_req->complete || !_req->buf ||
 878                !list_empty(&hsreq->queue)))
 879                return -EINVAL;
 880
 881        hsep = our_ep(_ep);
 882        hsudc = hsep->dev;
 883        if (!hsudc->driver || hsudc->gadget.speed == USB_SPEED_UNKNOWN)
 884                return -ESHUTDOWN;
 885
 886        spin_lock_irqsave(&hsudc->lock, flags);
 887        set_index(hsudc, hsep->bEndpointAddress);
 888
 889        _req->status = -EINPROGRESS;
 890        _req->actual = 0;
 891
 892        if (!ep_index(hsep) && _req->length == 0) {
 893                hsudc->ep0state = WAIT_FOR_SETUP;
 894                s3c_hsudc_complete_request(hsep, hsreq, 0);
 895                spin_unlock_irqrestore(&hsudc->lock, flags);
 896                return 0;
 897        }
 898
 899        if (list_empty(&hsep->queue) && !hsep->stopped) {
 900                offset = (ep_index(hsep)) ? S3C_ESR : S3C_EP0SR;
 901                if (ep_is_in(hsep)) {
 902                        csr = readl(hsudc->regs + offset);
 903                        if (!(csr & S3C_ESR_TX_SUCCESS) &&
 904                                (s3c_hsudc_write_fifo(hsep, hsreq) == 1))
 905                                hsreq = NULL;
 906                } else {
 907                        csr = readl(hsudc->regs + offset);
 908                        if ((csr & S3C_ESR_RX_SUCCESS)
 909                                   && (s3c_hsudc_read_fifo(hsep, hsreq) == 1))
 910                                hsreq = NULL;
 911                }
 912        }
 913
 914        if (hsreq)
 915                list_add_tail(&hsreq->queue, &hsep->queue);
 916
 917        spin_unlock_irqrestore(&hsudc->lock, flags);
 918        return 0;
 919}
 920
 921/**
 922 * s3c_hsudc_dequeue - Dequeue a transfer request from an endpoint.
 923 * @_ep: Endpoint from which the request is dequeued.
 924 * @_req: Request to be dequeued.
 925 *
 926 * Dequeue a request from a endpoint when called from gadget driver.
 927 */
 928static int s3c_hsudc_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 929{
 930        struct s3c_hsudc_ep *hsep = our_ep(_ep);
 931        struct s3c_hsudc *hsudc = hsep->dev;
 932        struct s3c_hsudc_req *hsreq;
 933        unsigned long flags;
 934
 935        hsep = our_ep(_ep);
 936        if (!_ep || hsep->ep.name == ep0name)
 937                return -EINVAL;
 938
 939        spin_lock_irqsave(&hsudc->lock, flags);
 940
 941        list_for_each_entry(hsreq, &hsep->queue, queue) {
 942                if (&hsreq->req == _req)
 943                        break;
 944        }
 945        if (&hsreq->req != _req) {
 946                spin_unlock_irqrestore(&hsudc->lock, flags);
 947                return -EINVAL;
 948        }
 949
 950        set_index(hsudc, hsep->bEndpointAddress);
 951        s3c_hsudc_complete_request(hsep, hsreq, -ECONNRESET);
 952
 953        spin_unlock_irqrestore(&hsudc->lock, flags);
 954        return 0;
 955}
 956
 957static const struct usb_ep_ops s3c_hsudc_ep_ops = {
 958        .enable = s3c_hsudc_ep_enable,
 959        .disable = s3c_hsudc_ep_disable,
 960        .alloc_request = s3c_hsudc_alloc_request,
 961        .free_request = s3c_hsudc_free_request,
 962        .queue = s3c_hsudc_queue,
 963        .dequeue = s3c_hsudc_dequeue,
 964        .set_halt = s3c_hsudc_set_halt,
 965        .set_wedge = s3c_hsudc_set_wedge,
 966};
 967
 968/**
 969 * s3c_hsudc_initep - Initialize a endpoint to default state.
 970 * @hsudc - Reference to the device controller.
 971 * @hsep - Endpoint to be initialized.
 972 * @epnum - Address to be assigned to the endpoint.
 973 *
 974 * Initialize a endpoint with default configuration.
 975 */
 976static void s3c_hsudc_initep(struct s3c_hsudc *hsudc,
 977                                struct s3c_hsudc_ep *hsep, int epnum)
 978{
 979        char *dir;
 980
 981        if ((epnum % 2) == 0) {
 982                dir = "out";
 983        } else {
 984                dir = "in";
 985                hsep->bEndpointAddress = USB_DIR_IN;
 986        }
 987
 988        hsep->bEndpointAddress |= epnum;
 989        if (epnum)
 990                snprintf(hsep->name, sizeof(hsep->name), "ep%d%s", epnum, dir);
 991        else
 992                snprintf(hsep->name, sizeof(hsep->name), "%s", ep0name);
 993
 994        INIT_LIST_HEAD(&hsep->queue);
 995        INIT_LIST_HEAD(&hsep->ep.ep_list);
 996        if (epnum)
 997                list_add_tail(&hsep->ep.ep_list, &hsudc->gadget.ep_list);
 998
 999        hsep->dev = hsudc;
1000        hsep->ep.name = hsep->name;
1001        usb_ep_set_maxpacket_limit(&hsep->ep, epnum ? 512 : 64);
1002        hsep->ep.ops = &s3c_hsudc_ep_ops;
1003        hsep->fifo = hsudc->regs + S3C_BR(epnum);
1004        hsep->ep.desc = NULL;
1005        hsep->stopped = 0;
1006        hsep->wedge = 0;
1007
1008        if (epnum == 0) {
1009                hsep->ep.caps.type_control = true;
1010                hsep->ep.caps.dir_in = true;
1011                hsep->ep.caps.dir_out = true;
1012        } else {
1013                hsep->ep.caps.type_iso = true;
1014                hsep->ep.caps.type_bulk = true;
1015                hsep->ep.caps.type_int = true;
1016        }
1017
1018        if (epnum & 1)
1019                hsep->ep.caps.dir_in = true;
1020        else
1021                hsep->ep.caps.dir_out = true;
1022
1023        set_index(hsudc, epnum);
1024        writel(hsep->ep.maxpacket, hsudc->regs + S3C_MPR);
1025}
1026
1027/**
1028 * s3c_hsudc_setup_ep - Configure all endpoints to default state.
1029 * @hsudc: Reference to device controller.
1030 *
1031 * Configures all endpoints to default state.
1032 */
1033static void s3c_hsudc_setup_ep(struct s3c_hsudc *hsudc)
1034{
1035        int epnum;
1036
1037        hsudc->ep0state = WAIT_FOR_SETUP;
1038        INIT_LIST_HEAD(&hsudc->gadget.ep_list);
1039        for (epnum = 0; epnum < hsudc->pd->epnum; epnum++)
1040                s3c_hsudc_initep(hsudc, &hsudc->ep[epnum], epnum);
1041}
1042
1043/**
1044 * s3c_hsudc_reconfig - Reconfigure the device controller to default state.
1045 * @hsudc: Reference to device controller.
1046 *
1047 * Reconfigures the device controller registers to a default state.
1048 */
1049static void s3c_hsudc_reconfig(struct s3c_hsudc *hsudc)
1050{
1051        writel(0xAA, hsudc->regs + S3C_EDR);
1052        writel(1, hsudc->regs + S3C_EIER);
1053        writel(0, hsudc->regs + S3C_TR);
1054        writel(S3C_SCR_DTZIEN_EN | S3C_SCR_RRD_EN | S3C_SCR_SUS_EN |
1055                        S3C_SCR_RST_EN, hsudc->regs + S3C_SCR);
1056        writel(0, hsudc->regs + S3C_EP0CR);
1057
1058        s3c_hsudc_setup_ep(hsudc);
1059}
1060
1061/**
1062 * s3c_hsudc_irq - Interrupt handler for device controller.
1063 * @irq: Not used.
1064 * @_dev: Reference to the device controller.
1065 *
1066 * Interrupt handler for the device controller. This handler handles controller
1067 * interrupts and endpoint interrupts.
1068 */
1069static irqreturn_t s3c_hsudc_irq(int irq, void *_dev)
1070{
1071        struct s3c_hsudc *hsudc = _dev;
1072        struct s3c_hsudc_ep *hsep;
1073        u32 ep_intr;
1074        u32 sys_status;
1075        u32 ep_idx;
1076
1077        spin_lock(&hsudc->lock);
1078
1079        sys_status = readl(hsudc->regs + S3C_SSR);
1080        ep_intr = readl(hsudc->regs + S3C_EIR) & 0x3FF;
1081
1082        if (!ep_intr && !(sys_status & S3C_SSR_DTZIEN_EN)) {
1083                spin_unlock(&hsudc->lock);
1084                return IRQ_HANDLED;
1085        }
1086
1087        if (sys_status) {
1088                if (sys_status & S3C_SSR_VBUSON)
1089                        writel(S3C_SSR_VBUSON, hsudc->regs + S3C_SSR);
1090
1091                if (sys_status & S3C_SSR_ERR)
1092                        writel(S3C_SSR_ERR, hsudc->regs + S3C_SSR);
1093
1094                if (sys_status & S3C_SSR_SDE) {
1095                        writel(S3C_SSR_SDE, hsudc->regs + S3C_SSR);
1096                        hsudc->gadget.speed = (sys_status & S3C_SSR_HSP) ?
1097                                USB_SPEED_HIGH : USB_SPEED_FULL;
1098                }
1099
1100                if (sys_status & S3C_SSR_SUSPEND) {
1101                        writel(S3C_SSR_SUSPEND, hsudc->regs + S3C_SSR);
1102                        if (hsudc->gadget.speed != USB_SPEED_UNKNOWN
1103                                && hsudc->driver && hsudc->driver->suspend)
1104                                hsudc->driver->suspend(&hsudc->gadget);
1105                }
1106
1107                if (sys_status & S3C_SSR_RESUME) {
1108                        writel(S3C_SSR_RESUME, hsudc->regs + S3C_SSR);
1109                        if (hsudc->gadget.speed != USB_SPEED_UNKNOWN
1110                                && hsudc->driver && hsudc->driver->resume)
1111                                hsudc->driver->resume(&hsudc->gadget);
1112                }
1113
1114                if (sys_status & S3C_SSR_RESET) {
1115                        writel(S3C_SSR_RESET, hsudc->regs + S3C_SSR);
1116                        for (ep_idx = 0; ep_idx < hsudc->pd->epnum; ep_idx++) {
1117                                hsep = &hsudc->ep[ep_idx];
1118                                hsep->stopped = 1;
1119                                s3c_hsudc_nuke_ep(hsep, -ECONNRESET);
1120                        }
1121                        s3c_hsudc_reconfig(hsudc);
1122                        hsudc->ep0state = WAIT_FOR_SETUP;
1123                }
1124        }
1125
1126        if (ep_intr & S3C_EIR_EP0) {
1127                writel(S3C_EIR_EP0, hsudc->regs + S3C_EIR);
1128                set_index(hsudc, 0);
1129                s3c_hsudc_handle_ep0_intr(hsudc);
1130        }
1131
1132        ep_intr >>= 1;
1133        ep_idx = 1;
1134        while (ep_intr) {
1135                if (ep_intr & 1)  {
1136                        hsep = &hsudc->ep[ep_idx];
1137                        set_index(hsudc, ep_idx);
1138                        writel(1 << ep_idx, hsudc->regs + S3C_EIR);
1139                        if (ep_is_in(hsep))
1140                                s3c_hsudc_epin_intr(hsudc, ep_idx);
1141                        else
1142                                s3c_hsudc_epout_intr(hsudc, ep_idx);
1143                }
1144                ep_intr >>= 1;
1145                ep_idx++;
1146        }
1147
1148        spin_unlock(&hsudc->lock);
1149        return IRQ_HANDLED;
1150}
1151
1152static int s3c_hsudc_start(struct usb_gadget *gadget,
1153                struct usb_gadget_driver *driver)
1154{
1155        struct s3c_hsudc *hsudc = to_hsudc(gadget);
1156        int ret;
1157
1158        if (!driver
1159                || driver->max_speed < USB_SPEED_FULL
1160                || !driver->setup)
1161                return -EINVAL;
1162
1163        if (!hsudc)
1164                return -ENODEV;
1165
1166        if (hsudc->driver)
1167                return -EBUSY;
1168
1169        hsudc->driver = driver;
1170
1171        ret = regulator_bulk_enable(ARRAY_SIZE(hsudc->supplies),
1172                                    hsudc->supplies);
1173        if (ret != 0) {
1174                dev_err(hsudc->dev, "failed to enable supplies: %d\n", ret);
1175                goto err_supplies;
1176        }
1177
1178        /* connect to bus through transceiver */
1179        if (!IS_ERR_OR_NULL(hsudc->transceiver)) {
1180                ret = otg_set_peripheral(hsudc->transceiver->otg,
1181                                        &hsudc->gadget);
1182                if (ret) {
1183                        dev_err(hsudc->dev, "%s: can't bind to transceiver\n",
1184                                        hsudc->gadget.name);
1185                        goto err_otg;
1186                }
1187        }
1188
1189        enable_irq(hsudc->irq);
1190        s3c_hsudc_reconfig(hsudc);
1191
1192        pm_runtime_get_sync(hsudc->dev);
1193
1194        s3c_hsudc_init_phy();
1195        if (hsudc->pd->gpio_init)
1196                hsudc->pd->gpio_init();
1197
1198        return 0;
1199err_otg:
1200        regulator_bulk_disable(ARRAY_SIZE(hsudc->supplies), hsudc->supplies);
1201err_supplies:
1202        hsudc->driver = NULL;
1203        return ret;
1204}
1205
1206static int s3c_hsudc_stop(struct usb_gadget *gadget)
1207{
1208        struct s3c_hsudc *hsudc = to_hsudc(gadget);
1209        unsigned long flags;
1210
1211        if (!hsudc)
1212                return -ENODEV;
1213
1214        spin_lock_irqsave(&hsudc->lock, flags);
1215        hsudc->gadget.speed = USB_SPEED_UNKNOWN;
1216        s3c_hsudc_uninit_phy();
1217
1218        pm_runtime_put(hsudc->dev);
1219
1220        if (hsudc->pd->gpio_uninit)
1221                hsudc->pd->gpio_uninit();
1222        s3c_hsudc_stop_activity(hsudc);
1223        spin_unlock_irqrestore(&hsudc->lock, flags);
1224
1225        if (!IS_ERR_OR_NULL(hsudc->transceiver))
1226                (void) otg_set_peripheral(hsudc->transceiver->otg, NULL);
1227
1228        disable_irq(hsudc->irq);
1229
1230        regulator_bulk_disable(ARRAY_SIZE(hsudc->supplies), hsudc->supplies);
1231        hsudc->driver = NULL;
1232
1233        return 0;
1234}
1235
1236static inline u32 s3c_hsudc_read_frameno(struct s3c_hsudc *hsudc)
1237{
1238        return readl(hsudc->regs + S3C_FNR) & 0x3FF;
1239}
1240
1241static int s3c_hsudc_gadget_getframe(struct usb_gadget *gadget)
1242{
1243        return s3c_hsudc_read_frameno(to_hsudc(gadget));
1244}
1245
1246static int s3c_hsudc_vbus_draw(struct usb_gadget *gadget, unsigned mA)
1247{
1248        struct s3c_hsudc *hsudc = to_hsudc(gadget);
1249
1250        if (!hsudc)
1251                return -ENODEV;
1252
1253        if (!IS_ERR_OR_NULL(hsudc->transceiver))
1254                return usb_phy_set_power(hsudc->transceiver, mA);
1255
1256        return -EOPNOTSUPP;
1257}
1258
1259static const struct usb_gadget_ops s3c_hsudc_gadget_ops = {
1260        .get_frame      = s3c_hsudc_gadget_getframe,
1261        .udc_start      = s3c_hsudc_start,
1262        .udc_stop       = s3c_hsudc_stop,
1263        .vbus_draw      = s3c_hsudc_vbus_draw,
1264};
1265
1266static int s3c_hsudc_probe(struct platform_device *pdev)
1267{
1268        struct device *dev = &pdev->dev;
1269        struct resource *res;
1270        struct s3c_hsudc *hsudc;
1271        struct s3c24xx_hsudc_platdata *pd = dev_get_platdata(&pdev->dev);
1272        int ret, i;
1273
1274        hsudc = devm_kzalloc(&pdev->dev, sizeof(struct s3c_hsudc) +
1275                        sizeof(struct s3c_hsudc_ep) * pd->epnum,
1276                        GFP_KERNEL);
1277        if (!hsudc)
1278                return -ENOMEM;
1279
1280        platform_set_drvdata(pdev, dev);
1281        hsudc->dev = dev;
1282        hsudc->pd = dev_get_platdata(&pdev->dev);
1283
1284        hsudc->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
1285
1286        for (i = 0; i < ARRAY_SIZE(hsudc->supplies); i++)
1287                hsudc->supplies[i].supply = s3c_hsudc_supply_names[i];
1288
1289        ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(hsudc->supplies),
1290                                 hsudc->supplies);
1291        if (ret != 0) {
1292                dev_err(dev, "failed to request supplies: %d\n", ret);
1293                goto err_supplies;
1294        }
1295
1296        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1297
1298        hsudc->regs = devm_ioremap_resource(&pdev->dev, res);
1299        if (IS_ERR(hsudc->regs)) {
1300                ret = PTR_ERR(hsudc->regs);
1301                goto err_res;
1302        }
1303
1304        spin_lock_init(&hsudc->lock);
1305
1306        hsudc->gadget.max_speed = USB_SPEED_HIGH;
1307        hsudc->gadget.ops = &s3c_hsudc_gadget_ops;
1308        hsudc->gadget.name = dev_name(dev);
1309        hsudc->gadget.ep0 = &hsudc->ep[0].ep;
1310        hsudc->gadget.is_otg = 0;
1311        hsudc->gadget.is_a_peripheral = 0;
1312        hsudc->gadget.speed = USB_SPEED_UNKNOWN;
1313
1314        s3c_hsudc_setup_ep(hsudc);
1315
1316        ret = platform_get_irq(pdev, 0);
1317        if (ret < 0) {
1318                dev_err(dev, "unable to obtain IRQ number\n");
1319                goto err_res;
1320        }
1321        hsudc->irq = ret;
1322
1323        ret = devm_request_irq(&pdev->dev, hsudc->irq, s3c_hsudc_irq, 0,
1324                                driver_name, hsudc);
1325        if (ret < 0) {
1326                dev_err(dev, "irq request failed\n");
1327                goto err_res;
1328        }
1329
1330        hsudc->uclk = devm_clk_get(&pdev->dev, "usb-device");
1331        if (IS_ERR(hsudc->uclk)) {
1332                dev_err(dev, "failed to find usb-device clock source\n");
1333                ret = PTR_ERR(hsudc->uclk);
1334                goto err_res;
1335        }
1336        clk_enable(hsudc->uclk);
1337
1338        local_irq_disable();
1339
1340        disable_irq(hsudc->irq);
1341        local_irq_enable();
1342
1343        ret = usb_add_gadget_udc(&pdev->dev, &hsudc->gadget);
1344        if (ret)
1345                goto err_add_udc;
1346
1347        pm_runtime_enable(dev);
1348
1349        return 0;
1350err_add_udc:
1351        clk_disable(hsudc->uclk);
1352err_res:
1353        if (!IS_ERR_OR_NULL(hsudc->transceiver))
1354                usb_put_phy(hsudc->transceiver);
1355
1356err_supplies:
1357        return ret;
1358}
1359
1360static struct platform_driver s3c_hsudc_driver = {
1361        .driver         = {
1362                .name   = "s3c-hsudc",
1363        },
1364        .probe          = s3c_hsudc_probe,
1365};
1366
1367module_platform_driver(s3c_hsudc_driver);
1368
1369MODULE_DESCRIPTION("Samsung S3C24XX USB high-speed controller driver");
1370MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");
1371MODULE_LICENSE("GPL");
1372MODULE_ALIAS("platform:s3c-hsudc");
1373