LXR uboot/drivers/usb/gadget/pxa27x

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * PXA27x USB device driver for u-boot.
   4 *
   5 * Copyright (C) 2007 Rodolfo Giometti <giometti@linux.it>
   6 * Copyright (C) 2007 Eurotech S.p.A.  <info@eurotech.it>
   7 * Copyright (C) 2008 Vivek Kutal      <vivek.kutal@azingo.com>
   8 */
   9
  10
  11#include <common.h>
  12#include <asm/arch/hardware.h>
  13#include <asm/byteorder.h>
  14#include <asm/io.h>
  15#include <usbdevice.h>
  16#include <usb/pxa27x_udc.h>
  17#include <usb/udc.h>
  18
  19#include "ep0.h"
  20
  21/* number of endpoints on this UDC */
  22#define UDC_MAX_ENDPOINTS       24
  23
  24static struct urb *ep0_urb;
  25static struct usb_device_instance *udc_device;
  26static int ep0state = EP0_IDLE;
  27
  28#ifdef USBDDBG
  29static void udc_dump_buffer(char *name, u8 *buf, int len)
  30{
  31        usbdbg("%s - buf %p, len %d", name, buf, len);
  32        print_buffer(0, buf, 1, len, 0);
  33}
  34#else
  35#define udc_dump_buffer(name, buf, len)         /* void */
  36#endif
  37
  38static inline void udc_ack_int_UDCCR(int mask)
  39{
  40        writel(readl(USIR1) | mask, USIR1);
  41}
  42
  43/*
  44 * If the endpoint has an active tx_urb, then the next packet of data from the
  45 * URB is written to the tx FIFO.
  46 * The total amount of data in the urb is given by urb->actual_length.
  47 * The maximum amount of data that can be sent in any one packet is given by
  48 * endpoint->tx_packetSize.
  49 * The number of data bytes from this URB that have already been transmitted
  50 * is given by endpoint->sent.
  51 * endpoint->last is updated by this routine with the number of data bytes
  52 * transmitted in this packet.
  53 */
  54static int udc_write_urb(struct usb_endpoint_instance *endpoint)
  55{
  56        struct urb *urb = endpoint->tx_urb;
  57        int ep_num = endpoint->endpoint_address & USB_ENDPOINT_NUMBER_MASK;
  58        u32 *data32 = (u32 *) urb->buffer;
  59        u8  *data8 = (u8 *) urb->buffer;
  60        unsigned int i, n, w, b, is_short;
  61        int timeout = 2000;     /* 2ms */
  62
  63        if (!urb || !urb->actual_length)
  64                return -1;
  65
  66        n = min_t(unsigned int, urb->actual_length - endpoint->sent,
  67                  endpoint->tx_packetSize);
  68        if (n <= 0)
  69                return -1;
  70
  71        usbdbg("write urb on ep %d", ep_num);
  72#if defined(USBDDBG) && defined(USBDPARANOIA)
  73        usbdbg("urb: buf %p, buf_len %d, actual_len %d",
  74                urb->buffer, urb->buffer_length, urb->actual_length);
  75        usbdbg("endpoint: sent %d, tx_packetSize %d, last %d",
  76                endpoint->sent, endpoint->tx_packetSize, endpoint->last);
  77#endif
  78
  79        is_short = n != endpoint->tx_packetSize;
  80        w = n / 4;
  81        b = n % 4;
  82        usbdbg("n %d%s w %d b %d", n, is_short ? "-s" : "", w, b);
  83        udc_dump_buffer("urb write", data8 + endpoint->sent, n);
  84
  85        /* Prepare for data send */
  86        if (ep_num)
  87                writel(UDCCSR_PC ,UDCCSN(ep_num));
  88
  89        for (i = 0; i < w; i++)
  90                  writel(data32[endpoint->sent / 4 + i], UDCDN(ep_num));
  91
  92        for (i = 0; i < b; i++)
  93                  writeb(data8[endpoint->sent + w * 4 + i], UDCDN(ep_num));
  94
  95        /* Set "Packet Complete" if less data then tx_packetSize */
  96        if (is_short)
  97                writel(ep_num ? UDCCSR_SP : UDCCSR0_IPR, UDCCSN(ep_num));
  98
  99        /* Wait for data sent */
 100        if (ep_num) {
 101                while (!(readl(UDCCSN(ep_num)) & UDCCSR_PC)) {
 102                        if (timeout-- == 0)
 103                                return -1;
 104                        else
 105                                udelay(1);
 106                }
 107        }
 108
 109        endpoint->last = n;
 110
 111        if (ep_num) {
 112                usbd_tx_complete(endpoint);
 113        } else {
 114                endpoint->sent += n;
 115                endpoint->last -= n;
 116        }
 117
 118        if (endpoint->sent >= urb->actual_length) {
 119                urb->actual_length = 0;
 120                endpoint->sent = 0;
 121                endpoint->last = 0;
 122        }
 123
 124        if ((endpoint->sent >= urb->actual_length) && (!ep_num)) {
 125                usbdbg("ep0 IN stage done");
 126                if (is_short)
 127                        ep0state = EP0_IDLE;
 128                else
 129                        ep0state = EP0_XFER_COMPLETE;
 130        }
 131
 132        return 0;
 133}
 134
 135static int udc_read_urb(struct usb_endpoint_instance *endpoint)
 136{
 137        struct urb *urb = endpoint->rcv_urb;
 138        int ep_num = endpoint->endpoint_address & USB_ENDPOINT_NUMBER_MASK;
 139        u32 *data32 = (u32 *) urb->buffer;
 140        unsigned int i, n;
 141
 142        usbdbg("read urb on ep %d", ep_num);
 143#if defined(USBDDBG) && defined(USBDPARANOIA)
 144        usbdbg("urb: buf %p, buf_len %d, actual_len %d",
 145                urb->buffer, urb->buffer_length, urb->actual_length);
 146        usbdbg("endpoint: rcv_packetSize %d",
 147                endpoint->rcv_packetSize);
 148#endif
 149
 150        if (readl(UDCCSN(ep_num)) & UDCCSR_BNE)
 151                n = readl(UDCBCN(ep_num)) & 0x3ff;
 152        else /* zlp */
 153                n = 0;
 154
 155        usbdbg("n %d%s", n, n != endpoint->rcv_packetSize ? "-s" : "");
 156        for (i = 0; i < n; i += 4)
 157                data32[urb->actual_length / 4 + i / 4] = readl(UDCDN(ep_num));
 158
 159        udc_dump_buffer("urb read", (u8 *) data32, urb->actual_length + n);
 160        usbd_rcv_complete(endpoint, n, 0);
 161
 162        return 0;
 163}
 164
 165static int udc_read_urb_ep0(void)
 166{
 167        u32 *data32 = (u32 *) ep0_urb->buffer;
 168        u8 *data8 = (u8 *) ep0_urb->buffer;
 169        unsigned int i, n, w, b;
 170
 171        usbdbg("read urb on ep 0");
 172#if defined(USBDDBG) && defined(USBDPARANOIA)
 173        usbdbg("urb: buf %p, buf_len %d, actual_len %d",
 174                ep0_urb->buffer, ep0_urb->buffer_length, ep0_urb->actual_length);
 175#endif
 176
 177        n = readl(UDCBCR0);
 178        w = n / 4;
 179        b = n % 4;
 180
 181        for (i = 0; i < w; i++) {
 182                data32[ep0_urb->actual_length / 4 + i] = readl(UDCDN(0));
 183                /* ep0_urb->actual_length += 4; */
 184        }
 185
 186        for (i = 0; i < b; i++) {
 187                data8[ep0_urb->actual_length + w * 4 + i] = readb(UDCDN(0));
 188                /* ep0_urb->actual_length++; */
 189        }
 190
 191        ep0_urb->actual_length += n;
 192
 193        udc_dump_buffer("urb read", (u8 *) data32, ep0_urb->actual_length);
 194
 195        writel(UDCCSR0_OPC | UDCCSR0_IPR, UDCCSR0);
 196        if (ep0_urb->actual_length == ep0_urb->device_request.wLength)
 197                return 1;
 198
 199        return 0;
 200}
 201
 202static void udc_handle_ep0(struct usb_endpoint_instance *endpoint)
 203{
 204        u32 udccsr0 = readl(UDCCSR0);
 205        u32 *data = (u32 *) &ep0_urb->device_request;
 206        int i;
 207
 208        usbdbg("udccsr0 %x", udccsr0);
 209
 210        /* Clear stall status */
 211        if (udccsr0 & UDCCSR0_SST) {
 212                usberr("clear stall status");
 213                writel(UDCCSR0_SST, UDCCSR0);
 214                ep0state = EP0_IDLE;
 215        }
 216
 217        /* previous request unfinished?  non-error iff back-to-back ... */
 218        if ((udccsr0 & UDCCSR0_SA) != 0 && ep0state != EP0_IDLE)
 219                ep0state = EP0_IDLE;
 220
 221        switch (ep0state) {
 222
 223        case EP0_IDLE:
 224                udccsr0 = readl(UDCCSR0);
 225                /* Start control request? */
 226                if ((udccsr0 & (UDCCSR0_OPC | UDCCSR0_SA | UDCCSR0_RNE))
 227                        == (UDCCSR0_OPC | UDCCSR0_SA | UDCCSR0_RNE)) {
 228
 229                        /* Read SETUP packet.
 230                         * SETUP packet size is 8 bytes (aka 2 words)
 231                         */
 232                        usbdbg("try reading SETUP packet");
 233                        for (i = 0; i < 2; i++) {
 234                                if ((readl(UDCCSR0) & UDCCSR0_RNE) == 0) {
 235                                        usberr("setup packet too short:%d", i);
 236                                        goto stall;
 237                                }
 238                                data[i] = readl(UDCDR0);
 239                        }
 240
 241                        writel(readl(UDCCSR0) | UDCCSR0_OPC | UDCCSR0_SA, UDCCSR0);
 242                        if ((readl(UDCCSR0) & UDCCSR0_RNE) != 0) {
 243                                usberr("setup packet too long");
 244                                goto stall;
 245                        }
 246
 247                        udc_dump_buffer("ep0 setup read", (u8 *) data, 8);
 248
 249                        if (ep0_urb->device_request.wLength == 0) {
 250                                usbdbg("Zero Data control Packet\n");
 251                                if (ep0_recv_setup(ep0_urb)) {
 252                                        usberr("Invalid Setup Packet\n");
 253                                        udc_dump_buffer("ep0 setup read",
 254                                                                (u8 *)data, 8);
 255                                        goto stall;
 256                                }
 257                                writel(UDCCSR0_IPR, UDCCSR0);
 258                                ep0state = EP0_IDLE;
 259                        } else {
 260                                /* Check direction */
 261                                if ((ep0_urb->device_request.bmRequestType &
 262                                                USB_REQ_DIRECTION_MASK)
 263                                                == USB_REQ_HOST2DEVICE) {
 264                                        ep0state = EP0_OUT_DATA;
 265                                        ep0_urb->buffer =
 266                                                (u8 *)ep0_urb->buffer_data;
 267                                        ep0_urb->buffer_length =
 268                                                sizeof(ep0_urb->buffer_data);
 269                                        ep0_urb->actual_length = 0;
 270                                        writel(UDCCSR0_IPR, UDCCSR0);
 271                                } else {
 272                                        /* The ep0_recv_setup function has
 273                                         * already placed our response packet
 274                                         * data in ep0_urb->buffer and the
 275                                         * packet length in
 276                                         * ep0_urb->actual_length.
 277                                         */
 278                                        if (ep0_recv_setup(ep0_urb)) {
 279stall:
 280                                                usberr("Invalid setup packet");
 281                                                udc_dump_buffer("ep0 setup read"
 282                                                        , (u8 *) data, 8);
 283                                                ep0state = EP0_IDLE;
 284
 285                                                writel(UDCCSR0_SA |
 286                                                UDCCSR0_OPC | UDCCSR0_FST |
 287                                                UDCCS0_FTF, UDCCSR0);
 288
 289                                                return;
 290                                        }
 291
 292                                        endpoint->tx_urb = ep0_urb;
 293                                        endpoint->sent = 0;
 294                                        usbdbg("EP0_IN_DATA");
 295                                        ep0state = EP0_IN_DATA;
 296                                        if (udc_write_urb(endpoint) < 0)
 297                                                goto stall;
 298
 299                                }
 300                        }
 301                        return;
 302                } else if ((udccsr0 & (UDCCSR0_OPC | UDCCSR0_SA))
 303                        == (UDCCSR0_OPC|UDCCSR0_SA)) {
 304                        usberr("Setup Active but no data. Stalling ....\n");
 305                        goto stall;
 306                } else {
 307                        usbdbg("random early IRQs");
 308                        /* Some random early IRQs:
 309                         * - we acked FST
 310                         * - IPR cleared
 311                         * - OPC got set, without SA (likely status stage)
 312                         */
 313                        writel(udccsr0 & (UDCCSR0_SA | UDCCSR0_OPC), UDCCSR0);
 314                }
 315                break;
 316
 317        case EP0_OUT_DATA:
 318
 319                if ((udccsr0 & UDCCSR0_OPC) && !(udccsr0 & UDCCSR0_SA)) {
 320                        if (udc_read_urb_ep0()) {
 321read_complete:
 322                                ep0state = EP0_IDLE;
 323                                if (ep0_recv_setup(ep0_urb)) {
 324                                        /* Not a setup packet, stall next
 325                                         * EP0 transaction
 326                                         */
 327                                        udc_dump_buffer("ep0 setup read",
 328                                                        (u8 *) data, 8);
 329                                        usberr("can't parse setup packet\n");
 330                                        goto stall;
 331                                }
 332                        }
 333                } else if (!(udccsr0 & UDCCSR0_OPC) &&
 334                                !(udccsr0 & UDCCSR0_IPR)) {
 335                        if (ep0_urb->device_request.wLength ==
 336                                ep0_urb->actual_length)
 337                                goto read_complete;
 338
 339                        usberr("Premature Status\n");
 340                        ep0state = EP0_IDLE;
 341                }
 342                break;
 343
 344        case EP0_IN_DATA:
 345                /* GET_DESCRIPTOR etc */
 346                if (udccsr0 & UDCCSR0_OPC) {
 347                        writel(UDCCSR0_OPC | UDCCSR0_FTF, UDCCSR0);
 348                        usberr("ep0in premature status");
 349                        ep0state = EP0_IDLE;
 350                } else {
 351                        /* irq was IPR clearing */
 352                        if (udc_write_urb(endpoint) < 0) {
 353                                usberr("ep0_write_error\n");
 354                                goto stall;
 355                        }
 356                }
 357                break;
 358
 359        case EP0_XFER_COMPLETE:
 360                writel(UDCCSR0_IPR, UDCCSR0);
 361                ep0state = EP0_IDLE;
 362                break;
 363
 364        default:
 365                usbdbg("Default\n");
 366        }
 367        writel(USIR0_IR0, USIR0);
 368}
 369
 370static void udc_handle_ep(struct usb_endpoint_instance *endpoint)
 371{
 372        int ep_addr = endpoint->endpoint_address;
 373        int ep_num = ep_addr & USB_ENDPOINT_NUMBER_MASK;
 374        int ep_isout = (ep_addr & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT;
 375
 376        u32 flags = readl(UDCCSN(ep_num)) & (UDCCSR_SST | UDCCSR_TRN);
 377        if (flags)
 378                writel(flags, UDCCSN(ep_num));
 379
 380        if (ep_isout)
 381                udc_read_urb(endpoint);
 382        else
 383                udc_write_urb(endpoint);
 384
 385        writel(UDCCSR_PC, UDCCSN(ep_num));
 386}
 387
 388static void udc_state_changed(void)
 389{
 390
 391        writel(readl(UDCCR) | UDCCR_SMAC, UDCCR);
 392
 393        usbdbg("New UDC settings are: conf %d - inter %d - alter %d",
 394               (readl(UDCCR) & UDCCR_ACN) >> UDCCR_ACN_S,
 395               (readl(UDCCR) & UDCCR_AIN) >> UDCCR_AIN_S,
 396               (readl(UDCCR) & UDCCR_AAISN) >> UDCCR_AAISN_S);
 397
 398        usbd_device_event_irq(udc_device, DEVICE_CONFIGURED, 0);
 399        writel(UDCISR1_IRCC, UDCISR1);
 400}
 401
 402void udc_irq(void)
 403{
 404        int handled;
 405        struct usb_endpoint_instance *endpoint;
 406        int ep_num, i;
 407        u32 udcisr0;
 408
 409        do {
 410                handled = 0;
 411                /* Suspend Interrupt Request */
 412                if (readl(USIR1) & UDCCR_SUSIR) {
 413                        usbdbg("Suspend\n");
 414                        udc_ack_int_UDCCR(UDCCR_SUSIR);
 415                        handled = 1;
 416                        ep0state = EP0_IDLE;
 417                }
 418
 419                /* Resume Interrupt Request */
 420                if (readl(USIR1) & UDCCR_RESIR) {
 421                        udc_ack_int_UDCCR(UDCCR_RESIR);
 422                        handled = 1;
 423                        usbdbg("USB resume\n");
 424                }
 425
 426                if (readl(USIR1) & (1<<31)) {
 427                        handled = 1;
 428                        udc_state_changed();
 429                }
 430
 431                /* Reset Interrupt Request */
 432                if (readl(USIR1) & UDCCR_RSTIR) {
 433                        udc_ack_int_UDCCR(UDCCR_RSTIR);
 434                        handled = 1;
 435                        usbdbg("Reset\n");
 436                        usbd_device_event_irq(udc_device, DEVICE_RESET, 0);
 437                } else {
 438                        if (readl(USIR0))
 439                                usbdbg("UISR0: %x \n", readl(USIR0));
 440
 441                        if (readl(USIR0) & 0x2)
 442                                writel(0x2, USIR0);
 443
 444                        /* Control traffic */
 445                        if (readl(USIR0)  & USIR0_IR0) {
 446                                handled = 1;
 447                                writel(USIR0_IR0, USIR0);
 448                                udc_handle_ep0(udc_device->bus->endpoint_array);
 449                        }
 450
 451                        endpoint = udc_device->bus->endpoint_array;
 452                        for (i = 0; i < udc_device->bus->max_endpoints; i++) {
 453                                ep_num = (endpoint[i].endpoint_address) &
 454                                                USB_ENDPOINT_NUMBER_MASK;
 455                                if (!ep_num)
 456                                        continue;
 457                                udcisr0 = readl(UDCISR0);
 458                                if (udcisr0 &
 459                                        UDCISR_INT(ep_num, UDC_INT_PACKETCMP)) {
 460                                        writel(UDCISR_INT(ep_num, UDC_INT_PACKETCMP),
 461                                               UDCISR0);
 462                                        udc_handle_ep(&endpoint[i]);
 463                                }
 464                        }
 465                }
 466
 467        } while (handled);
 468}
 469
 470/* The UDCCR reg contains mask and interrupt status bits,
 471 * so using '|=' isn't safe as it may ack an interrupt.
 472 */
 473#define UDCCR_OEN               (1 << 31)   /* On-the-Go Enable */
 474#define UDCCR_MASK_BITS         (UDCCR_OEN | UDCCR_UDE)
 475
 476static inline void udc_set_mask_UDCCR(int mask)
 477{
 478    writel((readl(UDCCR) & UDCCR_MASK_BITS) | (mask & UDCCR_MASK_BITS), UDCCR);
 479}
 480
 481static inline void udc_clear_mask_UDCCR(int mask)
 482{
 483    writel((readl(UDCCR) & UDCCR_MASK_BITS) & ~(mask & UDCCR_MASK_BITS), UDCCR);
 484}
 485
 486static void pio_irq_enable(int ep_num)
 487{
 488        if (ep_num < 16)
 489                writel(readl(UDCICR0) | 3 << (ep_num * 2), UDCICR0);
 490        else {
 491                ep_num -= 16;
 492                writel(readl(UDCICR1) | 3 << (ep_num * 2), UDCICR1);
 493        }
 494}
 495
 496/*
 497 * udc_set_nak
 498 *
 499 * Allow upper layers to signal lower layers should not accept more RX data
 500 */
 501void udc_set_nak(int ep_num)
 502{
 503        /* TODO */
 504}
 505
 506/*
 507 * udc_unset_nak
 508 *
 509 * Suspend sending of NAK tokens for DATA OUT tokens on a given endpoint.
 510 * Switch off NAKing on this endpoint to accept more data output from host.
 511 */
 512void udc_unset_nak(int ep_num)
 513{
 514        /* TODO */
 515}
 516
 517int udc_endpoint_write(struct usb_endpoint_instance *endpoint)
 518{
 519        return udc_write_urb(endpoint);
 520}
 521
 522/* Associate a physical endpoint with endpoint instance */
 523void udc_setup_ep(struct usb_device_instance *device, unsigned int id,
 524                                struct usb_endpoint_instance *endpoint)
 525{
 526        int ep_num, ep_addr, ep_isout, ep_type, ep_size;
 527        int config, interface, alternate;
 528        u32 tmp;
 529
 530        usbdbg("setting up endpoint id %d", id);
 531
 532        if (!endpoint) {
 533                usberr("endpoint void!");
 534                return;
 535        }
 536
 537        ep_num = endpoint->endpoint_address & USB_ENDPOINT_NUMBER_MASK;
 538        if (ep_num >= UDC_MAX_ENDPOINTS) {
 539                usberr("unable to setup ep %d!", ep_num);
 540                return;
 541        }
 542
 543        pio_irq_enable(ep_num);
 544        if (ep_num == 0) {
 545                /* Done for ep0 */
 546                return;
 547        }
 548
 549        config = 1;
 550        interface = 0;
 551        alternate = 0;
 552
 553        usbdbg("config %d - interface %d - alternate %d",
 554                config, interface, alternate);
 555
 556        ep_addr = endpoint->endpoint_address;
 557        ep_num = ep_addr & USB_ENDPOINT_NUMBER_MASK;
 558        ep_isout = (ep_addr & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT;
 559        ep_type = ep_isout ? endpoint->rcv_attributes : endpoint->tx_attributes;
 560        ep_size = ep_isout ? endpoint->rcv_packetSize : endpoint->tx_packetSize;
 561
 562        usbdbg("addr %x, num %d, dir %s, type %s, packet size %d",
 563                ep_addr, ep_num,
 564                ep_isout ? "out" : "in",
 565                ep_type == USB_ENDPOINT_XFER_ISOC ? "isoc" :
 566                ep_type == USB_ENDPOINT_XFER_BULK ? "bulk" :
 567                ep_type == USB_ENDPOINT_XFER_INT ? "int" : "???",
 568                ep_size
 569                );
 570
 571        /* Configure UDCCRx */
 572        tmp = 0;
 573        tmp |= (config << UDCCONR_CN_S) & UDCCONR_CN;
 574        tmp |= (interface << UDCCONR_IN_S) & UDCCONR_IN;
 575        tmp |= (alternate << UDCCONR_AISN_S) & UDCCONR_AISN;
 576        tmp |= (ep_num << UDCCONR_EN_S) & UDCCONR_EN;
 577        tmp |= (ep_type << UDCCONR_ET_S) & UDCCONR_ET;
 578        tmp |= ep_isout ? 0 : UDCCONR_ED;
 579        tmp |= (ep_size << UDCCONR_MPS_S) & UDCCONR_MPS;
 580        tmp |= UDCCONR_EE;
 581
 582        writel(tmp, UDCCN(ep_num));
 583
 584        usbdbg("UDCCR%c = %x", 'A' + ep_num-1, readl(UDCCN(ep_num)));
 585        usbdbg("UDCCSR%c = %x", 'A' + ep_num-1, readl(UDCCSN(ep_num)));
 586}
 587
 588/* Connect the USB device to the bus */
 589void udc_connect(void)
 590{
 591        usbdbg("UDC connect");
 592
 593#ifdef CONFIG_USB_DEV_PULLUP_GPIO
 594        /* Turn on the USB connection by enabling the pullup resistor */
 595        writel(readl(GPDR(CONFIG_USB_DEV_PULLUP_GPIO))
 596                     | GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO),
 597               GPDR(CONFIG_USB_DEV_PULLUP_GPIO));
 598        writel(GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO), GPSR(CONFIG_USB_DEV_PULLUP_GPIO));
 599#else
 600        /* Host port 2 transceiver D+ pull up enable */
 601        writel(readl(UP2OCR) | UP2OCR_DPPUE, UP2OCR);
 602#endif
 603}
 604
 605/* Disconnect the USB device to the bus */
 606void udc_disconnect(void)
 607{
 608        usbdbg("UDC disconnect");
 609
 610#ifdef CONFIG_USB_DEV_PULLUP_GPIO
 611        /* Turn off the USB connection by disabling the pullup resistor */
 612        writel(GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO), GPCR(CONFIG_USB_DEV_PULLUP_GPIO));
 613#else
 614        /* Host port 2 transceiver D+ pull up disable */
 615        writel(readl(UP2OCR) & ~UP2OCR_DPPUE, UP2OCR);
 616#endif
 617}
 618
 619/* Switch on the UDC */
 620void udc_enable(struct usb_device_instance *device)
 621{
 622
 623        ep0state = EP0_IDLE;
 624
 625        /* enable endpoint 0, A, B's Packet Complete Interrupt. */
 626        writel(0xffffffff, UDCICR0);
 627        writel(0xa8000000, UDCICR1);
 628
 629        /* clear the interrupt status/control registers */
 630        writel(0xffffffff, UDCISR0);
 631        writel(0xffffffff, UDCISR1);
 632
 633        /* set UDC-enable */
 634        udc_set_mask_UDCCR(UDCCR_UDE);
 635
 636        udc_device = device;
 637        if (!ep0_urb)
 638                ep0_urb = usbd_alloc_urb(udc_device,
 639                                udc_device->bus->endpoint_array);
 640        else
 641                usbinfo("ep0_urb %p already allocated", ep0_urb);
 642
 643        usbdbg("UDC Enabled\n");
 644}
 645
 646/* Need to check this again */
 647void udc_disable(void)
 648{
 649        usbdbg("disable UDC");
 650
 651        udc_clear_mask_UDCCR(UDCCR_UDE);
 652
 653        /* Disable clock for USB device */
 654        writel(readl(CKEN) & ~CKEN11_USB, CKEN);
 655
 656        /* Free ep0 URB */
 657        if (ep0_urb) {
 658                usbd_dealloc_urb(ep0_urb);
 659                ep0_urb = NULL;
 660        }
 661
 662        /* Reset device pointer */
 663        udc_device = NULL;
 664}
 665
 666/* Allow udc code to do any additional startup */
 667void udc_startup_events(struct usb_device_instance *device)
 668{
 669        /* The DEVICE_INIT event puts the USB device in the state STATE_INIT */
 670        usbd_device_event_irq(device, DEVICE_INIT, 0);
 671
 672        /* The DEVICE_CREATE event puts the USB device in the state
 673         * STATE_ATTACHED */
 674        usbd_device_event_irq(device, DEVICE_CREATE, 0);
 675
 676        /* Some USB controller driver implementations signal
 677         * DEVICE_HUB_CONFIGURED and DEVICE_RESET events here.
 678         * DEVICE_HUB_CONFIGURED causes a transition to the state
 679         * STATE_POWERED, and DEVICE_RESET causes a transition to
 680         * the state STATE_DEFAULT.
 681         */
 682        udc_enable(device);
 683}
 684
 685/* Initialize h/w stuff */
 686int udc_init(void)
 687{
 688        udc_device = NULL;
 689        usbdbg("PXA27x usbd start");
 690
 691        /* Enable clock for USB device */
 692        writel(readl(CKEN) | CKEN11_USB, CKEN);
 693
 694        /* Disable the UDC */
 695        udc_clear_mask_UDCCR(UDCCR_UDE);
 696
 697        /* Disable IRQs: we don't use them */
 698        writel(0, UDCICR0);
 699        writel(0, UDCICR1);
 700
 701        return 0;
 702}
 703