drivers/usb/gadget/ci_udc.c

   1 /*
   2  * Copyright 2011, Marvell Semiconductor Inc.
   3  * Lei Wen <leiwen@marvell.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  *
   7  * Back ported to the 8xx platform (from the 8260 platform) by
   8  * Murray.Jensen@cmst.csiro.au, 27-Jan-01.
   9  */
  10
  11 #include <common.h>
  12 #include <command.h>
  13 #include <config.h>
  14 #include <net.h>
  15 #include <malloc.h>
  16 #include <asm/byteorder.h>
  17 #include <asm/errno.h>
  18 #include <asm/io.h>
  19 #include <asm/unaligned.h>
  20 #include <linux/types.h>
  21 #include <linux/usb/ch9.h>
  22 #include <linux/usb/gadget.h>
  23 #include <usb/ci_udc.h>
  24 #include "../host/ehci.h"
  25 #include "ci_udc.h"
  26
  27 /*
  28  * Check if the system has too long cachelines. If the cachelines are
  29  * longer then 128b, the driver will not be able flush/invalidate data
  30  * cache over separate QH entries. We use 128b because one QH entry is
  31  * 64b long and there are always two QH list entries for each endpoint.
  32  */
  33 #if ARCH_DMA_MINALIGN > 128
  34 #error This driver can not work on systems with caches longer than 128b
  35 #endif
  36
  37 #ifndef DEBUG
  38 #define DBG(x...) do {} while (0)
  39 #else
  40 #define DBG(x...) printf(x)
  41 static const char *reqname(unsigned r)
  42 {
  43         switch (r) {
  44         case USB_REQ_GET_STATUS: return "GET_STATUS";
  45         case USB_REQ_CLEAR_FEATURE: return "CLEAR_FEATURE";
  46         case USB_REQ_SET_FEATURE: return "SET_FEATURE";
  47         case USB_REQ_SET_ADDRESS: return "SET_ADDRESS";
  48         case USB_REQ_GET_DESCRIPTOR: return "GET_DESCRIPTOR";
  49         case USB_REQ_SET_DESCRIPTOR: return "SET_DESCRIPTOR";
  50         case USB_REQ_GET_CONFIGURATION: return "GET_CONFIGURATION";
  51         case USB_REQ_SET_CONFIGURATION: return "SET_CONFIGURATION";
  52         case USB_REQ_GET_INTERFACE: return "GET_INTERFACE";
  53         case USB_REQ_SET_INTERFACE: return "SET_INTERFACE";
  54         default: return "*UNKNOWN*";
  55         }
  56 }
  57 #endif
  58
  59 static struct usb_endpoint_descriptor ep0_out_desc = {
  60         .bLength = sizeof(struct usb_endpoint_descriptor),
  61         .bDescriptorType = USB_DT_ENDPOINT,
  62         .bEndpointAddress = 0,
  63         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
  64 };
  65
  66 static struct usb_endpoint_descriptor ep0_in_desc = {
  67         .bLength = sizeof(struct usb_endpoint_descriptor),
  68         .bDescriptorType = USB_DT_ENDPOINT,
  69         .bEndpointAddress = USB_DIR_IN,
  70         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
  71 };
  72
  73 static int ci_pullup(struct usb_gadget *gadget, int is_on);
  74 static int ci_ep_enable(struct usb_ep *ep,
  75                 const struct usb_endpoint_descriptor *desc);
  76 static int ci_ep_disable(struct usb_ep *ep);
  77 static int ci_ep_queue(struct usb_ep *ep,
  78                 struct usb_request *req, gfp_t gfp_flags);
  79 static struct usb_request *
  80 ci_ep_alloc_request(struct usb_ep *ep, unsigned int gfp_flags);
  81 static void ci_ep_free_request(struct usb_ep *ep, struct usb_request *_req);
  82
  83 static struct usb_gadget_ops ci_udc_ops = {
  84         .pullup = ci_pullup,
  85 };
  86
  87 static struct usb_ep_ops ci_ep_ops = {
  88         .enable         = ci_ep_enable,
  89         .disable        = ci_ep_disable,
  90         .queue          = ci_ep_queue,
  91         .alloc_request  = ci_ep_alloc_request,
  92         .free_request   = ci_ep_free_request,
  93 };
  94
  95 /* Init values for USB endpoints. */
  96 static const struct usb_ep ci_ep_init[2] = {
  97         [0] = { /* EP 0 */
  98                 .maxpacket      = 64,
  99                 .name           = "ep0",
 100                 .ops            = &ci_ep_ops,
 101         },
 102         [1] = { /* EP 1..n */
 103                 .maxpacket      = 512,
 104                 .name           = "ep-",
 105                 .ops            = &ci_ep_ops,
 106         },
 107 };
 108
 109 static struct ci_drv controller = {
 110         .gadget = {
 111                 .name   = "ci_udc",
 112                 .ops    = &ci_udc_ops,
 113                 .is_dualspeed = 1,
 114         },
 115 };
 116
 117 /**
 118  * ci_get_qh() - return queue head for endpoint
 119  * @ep_num:     Endpoint number
 120  * @dir_in:     Direction of the endpoint (IN = 1, OUT = 0)
 121  *
 122  * This function returns the QH associated with particular endpoint
 123  * and it's direction.
 124  */
 125 static struct ept_queue_head *ci_get_qh(int ep_num, int dir_in)
 126 {
 127         return &controller.epts[(ep_num * 2) + dir_in];
 128 }
 129
 130 /**
 131  * ci_get_qtd() - return queue item for endpoint
 132  * @ep_num:     Endpoint number
 133  * @dir_in:     Direction of the endpoint (IN = 1, OUT = 0)
 134  *
 135  * This function returns the QH associated with particular endpoint
 136  * and it's direction.
 137  */
 138 static struct ept_queue_item *ci_get_qtd(int ep_num, int dir_in)
 139 {
 140         return controller.items[(ep_num * 2) + dir_in];
 141 }
 142
 143 /**
 144  * ci_flush_qh - flush cache over queue head
 145  * @ep_num:     Endpoint number
 146  *
 147  * This function flushes cache over QH for particular endpoint.
 148  */
 149 static void ci_flush_qh(int ep_num)
 150 {
 151         struct ept_queue_head *head = ci_get_qh(ep_num, 0);
 152         const uint32_t start = (uint32_t)head;
 153         const uint32_t end = start + 2 * sizeof(*head);
 154
 155         flush_dcache_range(start, end);
 156 }
 157
 158 /**
 159  * ci_invalidate_qh - invalidate cache over queue head
 160  * @ep_num:     Endpoint number
 161  *
 162  * This function invalidates cache over QH for particular endpoint.
 163  */
 164 static void ci_invalidate_qh(int ep_num)
 165 {
 166         struct ept_queue_head *head = ci_get_qh(ep_num, 0);
 167         uint32_t start = (uint32_t)head;
 168         uint32_t end = start + 2 * sizeof(*head);
 169
 170         invalidate_dcache_range(start, end);
 171 }
 172
 173 /**
 174  * ci_flush_qtd - flush cache over queue item
 175  * @ep_num:     Endpoint number
 176  *
 177  * This function flushes cache over qTD pair for particular endpoint.
 178  */
 179 static void ci_flush_qtd(int ep_num)
 180 {
 181         struct ept_queue_item *item = ci_get_qtd(ep_num, 0);
 182         const uint32_t start = (uint32_t)item;
 183         const uint32_t end_raw = start + 2 * sizeof(*item);
 184         const uint32_t end = roundup(end_raw, ARCH_DMA_MINALIGN);
 185
 186         flush_dcache_range(start, end);
 187 }
 188
 189 /**
 190  * ci_invalidate_qtd - invalidate cache over queue item
 191  * @ep_num:     Endpoint number
 192  *
 193  * This function invalidates cache over qTD pair for particular endpoint.
 194  */
 195 static void ci_invalidate_qtd(int ep_num)
 196 {
 197         struct ept_queue_item *item = ci_get_qtd(ep_num, 0);
 198         const uint32_t start = (uint32_t)item;
 199         const uint32_t end_raw = start + 2 * sizeof(*item);
 200         const uint32_t end = roundup(end_raw, ARCH_DMA_MINALIGN);
 201
 202         invalidate_dcache_range(start, end);
 203 }
 204
 205 static struct usb_request *
 206 ci_ep_alloc_request(struct usb_ep *ep, unsigned int gfp_flags)
 207 {
 208         struct ci_req *ci_req;
 209
 210         ci_req = memalign(ARCH_DMA_MINALIGN, sizeof(*ci_req));
 211         if (!ci_req)
 212                 return NULL;
 213
 214         INIT_LIST_HEAD(&ci_req->queue);
 215         ci_req->b_buf = 0;
 216
 217         return &ci_req->req;
 218 }
 219
 220 static void ci_ep_free_request(struct usb_ep *ep, struct usb_request *req)
 221 {
 222         struct ci_req *ci_req;
 223
 224         ci_req = container_of(req, struct ci_req, req);
 225         if (ci_req->b_buf)
 226                 free(ci_req->b_buf);
 227         free(ci_req);
 228 }
 229
 230 static void ep_enable(int num, int in, int maxpacket)
 231 {
 232         struct ci_udc *udc = (struct ci_udc *)controller.ctrl->hcor;
 233         unsigned n;
 234
 235         n = readl(&udc->epctrl[num]);
 236         if (in)
 237                 n |= (CTRL_TXE | CTRL_TXR | CTRL_TXT_BULK);
 238         else
 239                 n |= (CTRL_RXE | CTRL_RXR | CTRL_RXT_BULK);
 240
 241         if (num != 0) {
 242                 struct ept_queue_head *head = ci_get_qh(num, in);
 243
 244                 head->config = CONFIG_MAX_PKT(maxpacket) | CONFIG_ZLT;
 245                 ci_flush_qh(num);
 246         }
 247         writel(n, &udc->epctrl[num]);
 248 }
 249
 250 static int ci_ep_enable(struct usb_ep *ep,
 251                 const struct usb_endpoint_descriptor *desc)
 252 {
 253         struct ci_ep *ci_ep = container_of(ep, struct ci_ep, ep);
 254         int num, in;
 255         num = desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
 256         in = (desc->bEndpointAddress & USB_DIR_IN) != 0;
 257         ci_ep->desc = desc;
 258
 259         if (num) {
 260                 int max = get_unaligned_le16(&desc->wMaxPacketSize);
 261
 262                 if ((max > 64) && (controller.gadget.speed == USB_SPEED_FULL))
 263                         max = 64;
 264                 if (ep->maxpacket != max) {
 265                         DBG("%s: from %d to %d\n", __func__,
 266                             ep->maxpacket, max);
 267                         ep->maxpacket = max;
 268                 }
 269         }
 270         ep_enable(num, in, ep->maxpacket);
 271         DBG("%s: num=%d maxpacket=%d\n", __func__, num, ep->maxpacket);
 272         return 0;
 273 }
 274
 275 static int ci_ep_disable(struct usb_ep *ep)
 276 {
 277         struct ci_ep *ci_ep = container_of(ep, struct ci_ep, ep);
 278
 279         ci_ep->desc = NULL;
 280         return 0;
 281 }
 282
 283 static int ci_bounce(struct ci_req *ci_req, int in)
 284 {
 285         struct usb_request *req = &ci_req->req;
 286         uint32_t addr = (uint32_t)req->buf;
 287         uint32_t hwaddr;
 288         uint32_t aligned_used_len;
 289
 290         /* Input buffer address is not aligned. */
 291         if (addr & (ARCH_DMA_MINALIGN - 1))
 292                 goto align;
 293
 294         /* Input buffer length is not aligned. */
 295         if (req->length & (ARCH_DMA_MINALIGN - 1))
 296                 goto align;
 297
 298         /* The buffer is well aligned, only flush cache. */
 299         ci_req->hw_len = req->length;
 300         ci_req->hw_buf = req->buf;
 301         goto flush;
 302
 303 align:
 304         if (ci_req->b_buf && req->length > ci_req->b_len) {
 305                 free(ci_req->b_buf);
 306                 ci_req->b_buf = 0;
 307         }
 308         if (!ci_req->b_buf) {
 309                 ci_req->b_len = roundup(req->length, ARCH_DMA_MINALIGN);
 310                 ci_req->b_buf = memalign(ARCH_DMA_MINALIGN, ci_req->b_len);
 311                 if (!ci_req->b_buf)
 312                         return -ENOMEM;
 313         }
 314         ci_req->hw_len = ci_req->b_len;
 315         ci_req->hw_buf = ci_req->b_buf;
 316
 317         if (in)
 318                 memcpy(ci_req->hw_buf, req->buf, req->length);
 319
 320 flush:
 321         hwaddr = (uint32_t)ci_req->hw_buf;
 322         aligned_used_len = roundup(req->length, ARCH_DMA_MINALIGN);
 323         flush_dcache_range(hwaddr, hwaddr + aligned_used_len);
 324
 325         return 0;
 326 }
 327
 328 static void ci_debounce(struct ci_req *ci_req, int in)
 329 {
 330         struct usb_request *req = &ci_req->req;
 331         uint32_t addr = (uint32_t)req->buf;
 332         uint32_t hwaddr = (uint32_t)ci_req->hw_buf;
 333         uint32_t aligned_used_len;
 334
 335         if (in)
 336                 return;
 337
 338         aligned_used_len = roundup(req->actual, ARCH_DMA_MINALIGN);
 339         invalidate_dcache_range(hwaddr, hwaddr + aligned_used_len);
 340
 341         if (addr == hwaddr)
 342                 return; /* not a bounce */
 343
 344         memcpy(req->buf, ci_req->hw_buf, req->actual);
 345 }
 346
 347 static void ci_ep_submit_next_request(struct ci_ep *ci_ep)
 348 {
 349         struct ci_udc *udc = (struct ci_udc *)controller.ctrl->hcor;
 350         struct ept_queue_item *item;
 351         struct ept_queue_head *head;
 352         int bit, num, len, in;
 353         struct ci_req *ci_req;
 354
 355         ci_ep->req_primed = true;
 356
 357         num = ci_ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
 358         in = (ci_ep->desc->bEndpointAddress & USB_DIR_IN) != 0;
 359         item = ci_get_qtd(num, in);
 360         head = ci_get_qh(num, in);
 361
 362         ci_req = list_first_entry(&ci_ep->queue, struct ci_req, queue);
 363         len = ci_req->req.length;
 364
 365         item->next = TERMINATE;
 366         item->info = INFO_BYTES(len) | INFO_IOC | INFO_ACTIVE;
 367         item->page0 = (uint32_t)ci_req->hw_buf;
 368         item->page1 = ((uint32_t)ci_req->hw_buf & 0xfffff000) + 0x1000;
 369         item->page2 = ((uint32_t)ci_req->hw_buf & 0xfffff000) + 0x2000;
 370         item->page3 = ((uint32_t)ci_req->hw_buf & 0xfffff000) + 0x3000;
 371         item->page4 = ((uint32_t)ci_req->hw_buf & 0xfffff000) + 0x4000;
 372         ci_flush_qtd(num);
 373
 374         head->next = (unsigned) item;
 375         head->info = 0;
 376
 377         DBG("ept%d %s queue len %x, req %p, buffer %p\n",
 378             num, in ? "in" : "out", len, ci_req, ci_req->hw_buf);
 379         ci_flush_qh(num);
 380
 381         if (in)
 382                 bit = EPT_TX(num);
 383         else
 384                 bit = EPT_RX(num);
 385
 386         writel(bit, &udc->epprime);
 387 }
 388
 389 static int ci_ep_queue(struct usb_ep *ep,
 390                 struct usb_request *req, gfp_t gfp_flags)
 391 {
 392         struct ci_ep *ci_ep = container_of(ep, struct ci_ep, ep);
 393         struct ci_req *ci_req = container_of(req, struct ci_req, req);
 394         int in, ret;
 395         int __maybe_unused num;
 396
 397         num = ci_ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
 398         in = (ci_ep->desc->bEndpointAddress & USB_DIR_IN) != 0;
 399
 400         ret = ci_bounce(ci_req, in);
 401         if (ret)
 402                 return ret;
 403
 404         DBG("ept%d %s pre-queue req %p, buffer %p\n",
 405             num, in ? "in" : "out", ci_req, ci_req->hw_buf);
 406         list_add_tail(&ci_req->queue, &ci_ep->queue);
 407
 408         if (!ci_ep->req_primed)
 409                 ci_ep_submit_next_request(ci_ep);
 410
 411         return 0;
 412 }
 413
 414 static void handle_ep_complete(struct ci_ep *ep)
 415 {
 416         struct ept_queue_item *item;
 417         int num, in, len;
 418         struct ci_req *ci_req;
 419
 420         num = ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
 421         in = (ep->desc->bEndpointAddress & USB_DIR_IN) != 0;
 422         if (num == 0)
 423                 ep->desc = &ep0_out_desc;
 424         item = ci_get_qtd(num, in);
 425         ci_invalidate_qtd(num);
 426
 427         len = (item->info >> 16) & 0x7fff;
 428         if (item->info & 0xff)
 429                 printf("EP%d/%s FAIL info=%x pg0=%x\n",
 430                        num, in ? "in" : "out", item->info, item->page0);
 431
 432         ci_req = list_first_entry(&ep->queue, struct ci_req, queue);
 433         list_del_init(&ci_req->queue);
 434         ep->req_primed = false;
 435
 436         if (!list_empty(&ep->queue))
 437                 ci_ep_submit_next_request(ep);
 438
 439         ci_req->req.actual = ci_req->req.length - len;
 440         ci_debounce(ci_req, in);
 441
 442         DBG("ept%d %s req %p, complete %x\n",
 443             num, in ? "in" : "out", ci_req, len);
 444         ci_req->req.complete(&ep->ep, &ci_req->req);
 445         if (num == 0) {
 446                 ci_req->req.length = 0;
 447                 usb_ep_queue(&ep->ep, &ci_req->req, 0);
 448                 ep->desc = &ep0_in_desc;
 449         }
 450 }
 451
 452 #define SETUP(type, request) (((type) << 8) | (request))
 453
 454 static void handle_setup(void)
 455 {
 456         struct ci_ep *ci_ep = &controller.ep[0];
 457         struct ci_req *ci_req;
 458         struct usb_request *req;
 459         struct ci_udc *udc = (struct ci_udc *)controller.ctrl->hcor;
 460         struct ept_queue_head *head;
 461         struct usb_ctrlrequest r;
 462         int status = 0;
 463         int num, in, _num, _in, i;
 464         char *buf;
 465
 466         ci_req = list_first_entry(&ci_ep->queue, struct ci_req, queue);
 467         req = &ci_req->req;
 468         head = ci_get_qh(0, 0); /* EP0 OUT */
 469
 470         ci_invalidate_qh(0);
 471         memcpy(&r, head->setup_data, sizeof(struct usb_ctrlrequest));
 472 #ifdef CONFIG_CI_UDC_HAS_HOSTPC
 473         writel(EPT_RX(0), &udc->epsetupstat);
 474 #else
 475         writel(EPT_RX(0), &udc->epstat);
 476 #endif
 477         DBG("handle setup %s, %x, %x index %x value %x\n", reqname(r.bRequest),
 478             r.bRequestType, r.bRequest, r.wIndex, r.wValue);
 479
 480         list_del_init(&ci_req->queue);
 481         ci_ep->req_primed = false;
 482
 483         switch (SETUP(r.bRequestType, r.bRequest)) {
 484         case SETUP(USB_RECIP_ENDPOINT, USB_REQ_CLEAR_FEATURE):
 485                 _num = r.wIndex & 15;
 486                 _in = !!(r.wIndex & 0x80);
 487
 488                 if ((r.wValue == 0) && (r.wLength == 0)) {
 489                         req->length = 0;
 490                         for (i = 0; i < NUM_ENDPOINTS; i++) {
 491                                 struct ci_ep *ep = &controller.ep[i];
 492
 493                                 if (!ep->desc)
 494                                         continue;
 495                                 num = ep->desc->bEndpointAddress
 496                                                 & USB_ENDPOINT_NUMBER_MASK;
 497                                 in = (ep->desc->bEndpointAddress
 498                                                 & USB_DIR_IN) != 0;
 499                                 if ((num == _num) && (in == _in)) {
 500                                         ep_enable(num, in, ep->ep.maxpacket);
 501                                         usb_ep_queue(controller.gadget.ep0,
 502                                                         req, 0);
 503                                         break;
 504                                 }
 505                         }
 506                 }
 507                 return;
 508
 509         case SETUP(USB_RECIP_DEVICE, USB_REQ_SET_ADDRESS):
 510                 /*
 511                  * write address delayed (will take effect
 512                  * after the next IN txn)
 513                  */
 514                 writel((r.wValue << 25) | (1 << 24), &udc->devaddr);
 515                 req->length = 0;
 516                 usb_ep_queue(controller.gadget.ep0, req, 0);
 517                 return;
 518
 519         case SETUP(USB_DIR_IN | USB_RECIP_DEVICE, USB_REQ_GET_STATUS):
 520                 req->length = 2;
 521                 buf = (char *)req->buf;
 522                 buf[0] = 1 << USB_DEVICE_SELF_POWERED;
 523                 buf[1] = 0;
 524                 usb_ep_queue(controller.gadget.ep0, req, 0);
 525                 return;
 526         }
 527         /* pass request up to the gadget driver */
 528         if (controller.driver)
 529                 status = controller.driver->setup(&controller.gadget, &r);
 530         else
 531                 status = -ENODEV;
 532
 533         if (!status)
 534                 return;
 535         DBG("STALL reqname %s type %x value %x, index %x\n",
 536             reqname(r.bRequest), r.bRequestType, r.wValue, r.wIndex);
 537         writel((1<<16) | (1 << 0), &udc->epctrl[0]);
 538 }
 539
 540 static void stop_activity(void)
 541 {
 542         int i, num, in;
 543         struct ept_queue_head *head;
 544         struct ci_udc *udc = (struct ci_udc *)controller.ctrl->hcor;
 545         writel(readl(&udc->epcomp), &udc->epcomp);
 546 #ifdef CONFIG_CI_UDC_HAS_HOSTPC
 547         writel(readl(&udc->epsetupstat), &udc->epsetupstat);
 548 #endif
 549         writel(readl(&udc->epstat), &udc->epstat);
 550         writel(0xffffffff, &udc->epflush);
 551
 552         /* error out any pending reqs */
 553         for (i = 0; i < NUM_ENDPOINTS; i++) {
 554                 if (i != 0)
 555                         writel(0, &udc->epctrl[i]);
 556                 if (controller.ep[i].desc) {
 557                         num = controller.ep[i].desc->bEndpointAddress
 558                                 & USB_ENDPOINT_NUMBER_MASK;
 559                         in = (controller.ep[i].desc->bEndpointAddress
 560                                 & USB_DIR_IN) != 0;
 561                         head = ci_get_qh(num, in);
 562                         head->info = INFO_ACTIVE;
 563                         ci_flush_qh(num);
 564                 }
 565         }
 566 }
 567
 568 void udc_irq(void)
 569 {
 570         struct ci_udc *udc = (struct ci_udc *)controller.ctrl->hcor;
 571         unsigned n = readl(&udc->usbsts);
 572         writel(n, &udc->usbsts);
 573         int bit, i, num, in;
 574
 575         n &= (STS_SLI | STS_URI | STS_PCI | STS_UI | STS_UEI);
 576         if (n == 0)
 577                 return;
 578
 579         if (n & STS_URI) {
 580                 DBG("-- reset --\n");
 581                 stop_activity();
 582         }
 583         if (n & STS_SLI)
 584                 DBG("-- suspend --\n");
 585
 586         if (n & STS_PCI) {
 587                 int max = 64;
 588                 int speed = USB_SPEED_FULL;
 589
 590 #ifdef CONFIG_CI_UDC_HAS_HOSTPC
 591                 bit = (readl(&udc->hostpc1_devlc) >> 25) & 3;
 592 #else
 593                 bit = (readl(&udc->portsc) >> 26) & 3;
 594 #endif
 595                 DBG("-- portchange %x %s\n", bit, (bit == 2) ? "High" : "Full");
 596                 if (bit == 2) {
 597                         speed = USB_SPEED_HIGH;
 598                         max = 512;
 599                 }
 600                 controller.gadget.speed = speed;
 601                 for (i = 1; i < NUM_ENDPOINTS; i++) {
 602                         if (controller.ep[i].ep.maxpacket > max)
 603                                 controller.ep[i].ep.maxpacket = max;
 604                 }
 605         }
 606
 607         if (n & STS_UEI)
 608                 printf("<UEI %x>\n", readl(&udc->epcomp));
 609
 610         if ((n & STS_UI) || (n & STS_UEI)) {
 611 #ifdef CONFIG_CI_UDC_HAS_HOSTPC
 612                 n = readl(&udc->epsetupstat);
 613 #else
 614                 n = readl(&udc->epstat);
 615 #endif
 616                 if (n & EPT_RX(0))
 617                         handle_setup();
 618
 619                 n = readl(&udc->epcomp);
 620                 if (n != 0)
 621                         writel(n, &udc->epcomp);
 622
 623                 for (i = 0; i < NUM_ENDPOINTS && n; i++) {
 624                         if (controller.ep[i].desc) {
 625                                 num = controller.ep[i].desc->bEndpointAddress
 626                                         & USB_ENDPOINT_NUMBER_MASK;
 627                                 in = (controller.ep[i].desc->bEndpointAddress
 628                                                 & USB_DIR_IN) != 0;
 629                                 bit = (in) ? EPT_TX(num) : EPT_RX(num);
 630                                 if (n & bit)
 631                                         handle_ep_complete(&controller.ep[i]);
 632                         }
 633                 }
 634         }
 635 }
 636
 637 int usb_gadget_handle_interrupts(void)
 638 {
 639         u32 value;
 640         struct ci_udc *udc = (struct ci_udc *)controller.ctrl->hcor;
 641
 642         value = readl(&udc->usbsts);
 643         if (value)
 644                 udc_irq();
 645
 646         return value;
 647 }
 648
 649 static int ci_pullup(struct usb_gadget *gadget, int is_on)
 650 {
 651         struct ci_udc *udc = (struct ci_udc *)controller.ctrl->hcor;
 652         if (is_on) {
 653                 /* RESET */
 654                 writel(USBCMD_ITC(MICRO_8FRAME) | USBCMD_RST, &udc->usbcmd);
 655                 udelay(200);
 656
 657                 writel((unsigned)controller.epts, &udc->epinitaddr);
 658
 659                 /* select DEVICE mode */
 660                 writel(USBMODE_DEVICE, &udc->usbmode);
 661
 662                 writel(0xffffffff, &udc->epflush);
 663
 664                 /* Turn on the USB connection by enabling the pullup resistor */
 665                 writel(USBCMD_ITC(MICRO_8FRAME) | USBCMD_RUN, &udc->usbcmd);
 666         } else {
 667                 stop_activity();
 668                 writel(USBCMD_FS2, &udc->usbcmd);
 669                 udelay(800);
 670                 if (controller.driver)
 671                         controller.driver->disconnect(gadget);
 672         }
 673
 674         return 0;
 675 }
 676
 677 void udc_disconnect(void)
 678 {
 679         struct ci_udc *udc = (struct ci_udc *)controller.ctrl->hcor;
 680         /* disable pullup */
 681         stop_activity();
 682         writel(USBCMD_FS2, &udc->usbcmd);
 683         udelay(800);
 684         if (controller.driver)
 685                 controller.driver->disconnect(&controller.gadget);
 686 }
 687
 688 static int ci_udc_probe(void)
 689 {
 690         struct ept_queue_head *head;
 691         uint8_t *imem;
 692         int i;
 693
 694         const int num = 2 * NUM_ENDPOINTS;
 695
 696         const int eplist_min_align = 4096;
 697         const int eplist_align = roundup(eplist_min_align, ARCH_DMA_MINALIGN);
 698         const int eplist_raw_sz = num * sizeof(struct ept_queue_head);
 699         const int eplist_sz = roundup(eplist_raw_sz, ARCH_DMA_MINALIGN);
 700
 701         const int ilist_align = roundup(ARCH_DMA_MINALIGN, 32);
 702         const int ilist_ent_raw_sz = 2 * sizeof(struct ept_queue_item);
 703         const int ilist_ent_sz = roundup(ilist_ent_raw_sz, ARCH_DMA_MINALIGN);
 704         const int ilist_sz = NUM_ENDPOINTS * ilist_ent_sz;
 705
 706         /* The QH list must be aligned to 4096 bytes. */
 707         controller.epts = memalign(eplist_align, eplist_sz);
 708         if (!controller.epts)
 709                 return -ENOMEM;
 710         memset(controller.epts, 0, eplist_sz);
 711
 712         /*
 713          * Each qTD item must be 32-byte aligned, each qTD touple must be
 714          * cacheline aligned. There are two qTD items for each endpoint and
 715          * only one of them is used for the endpoint at time, so we can group
 716          * them together.
 717          */
 718         controller.items_mem = memalign(ilist_align, ilist_sz);
 719         if (!controller.items_mem) {
 720                 free(controller.epts);
 721                 return -ENOMEM;
 722         }
 723         memset(controller.items_mem, 0, ilist_sz);
 724
 725         for (i = 0; i < 2 * NUM_ENDPOINTS; i++) {
 726                 /*
 727                  * Configure QH for each endpoint. The structure of the QH list
 728                  * is such that each two subsequent fields, N and N+1 where N is
 729                  * even, in the QH list represent QH for one endpoint. The Nth
 730                  * entry represents OUT configuration and the N+1th entry does
 731                  * represent IN configuration of the endpoint.
 732                  */
 733                 head = controller.epts + i;
 734                 if (i < 2)
 735                         head->config = CONFIG_MAX_PKT(EP0_MAX_PACKET_SIZE)
 736                                 | CONFIG_ZLT | CONFIG_IOS;
 737                 else
 738                         head->config = CONFIG_MAX_PKT(EP_MAX_PACKET_SIZE)
 739                                 | CONFIG_ZLT;
 740                 head->next = TERMINATE;
 741                 head->info = 0;
 742
 743                 imem = controller.items_mem + ((i >> 1) * ilist_ent_sz);
 744                 if (i & 1)
 745                         imem += sizeof(struct ept_queue_item);
 746
 747                 controller.items[i] = (struct ept_queue_item *)imem;
 748
 749                 if (i & 1) {
 750                         ci_flush_qh(i - 1);
 751                         ci_flush_qtd(i - 1);
 752                 }
 753         }
 754
 755         INIT_LIST_HEAD(&controller.gadget.ep_list);
 756
 757         /* Init EP 0 */
 758         memcpy(&controller.ep[0].ep, &ci_ep_init[0], sizeof(*ci_ep_init));
 759         controller.ep[0].desc = &ep0_in_desc;
 760         INIT_LIST_HEAD(&controller.ep[0].queue);
 761         controller.ep[0].req_primed = false;
 762         controller.gadget.ep0 = &controller.ep[0].ep;
 763         INIT_LIST_HEAD(&controller.gadget.ep0->ep_list);
 764
 765         /* Init EP 1..n */
 766         for (i = 1; i < NUM_ENDPOINTS; i++) {
 767                 memcpy(&controller.ep[i].ep, &ci_ep_init[1],
 768                        sizeof(*ci_ep_init));
 769                 INIT_LIST_HEAD(&controller.ep[i].queue);
 770                 controller.ep[i].req_primed = false;
 771                 list_add_tail(&controller.ep[i].ep.ep_list,
 772                               &controller.gadget.ep_list);
 773         }
 774
 775         return 0;
 776 }
 777
 778 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
 779 {
 780         int ret;
 781
 782         if (!driver)
 783                 return -EINVAL;
 784         if (!driver->bind || !driver->setup || !driver->disconnect)
 785                 return -EINVAL;
 786         if (driver->speed != USB_SPEED_FULL && driver->speed != USB_SPEED_HIGH)
 787                 return -EINVAL;
 788
 789         ret = usb_lowlevel_init(0, USB_INIT_DEVICE, (void **)&controller.ctrl);
 790         if (ret)
 791                 return ret;
 792
 793         ret = ci_udc_probe();
 794 #if defined(CONFIG_USB_EHCI_MX6) || defined(CONFIG_USB_EHCI_MXS)
 795         /*
 796          * FIXME: usb_lowlevel_init()->ehci_hcd_init() should be doing all
 797          * HW-specific initialization, e.g. ULPI-vs-UTMI PHY selection
 798          */
 799         if (!ret) {
 800                 struct ci_udc *udc = (struct ci_udc *)controller.ctrl->hcor;
 801
 802                 /* select ULPI phy */
 803                 writel(PTS(PTS_ENABLE) | PFSC, &udc->portsc);
 804         }
 805 #endif
 806
 807         ret = driver->bind(&controller.gadget);
 808         if (ret) {
 809                 DBG("driver->bind() returned %d\n", ret);
 810                 return ret;
 811         }
 812         controller.driver = driver;
 813
 814         return 0;
 815 }
 816
 817 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 818 {
 819         return 0;
 820 }