drivers/usb/chipidea/udc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * udc.c - ChipIdea UDC driver
   4  *
   5  * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
   6  *
   7  * Author: David Lopo
   8  */
   9
  10 #include <linux/delay.h>
  11 #include <linux/device.h>
  12 #include <linux/dmapool.h>
  13 #include <linux/err.h>
  14 #include <linux/irqreturn.h>
  15 #include <linux/kernel.h>
  16 #include <linux/slab.h>
  17 #include <linux/pm_runtime.h>
  18 #include <linux/pinctrl/consumer.h>
  19 #include <linux/usb/ch9.h>
  20 #include <linux/usb/gadget.h>
  21 #include <linux/usb/otg-fsm.h>
  22 #include <linux/usb/chipidea.h>
  23
  24 #include "ci.h"
  25 #include "udc.h"
  26 #include "bits.h"
  27 #include "otg.h"
  28 #include "otg_fsm.h"
  29 #include "trace.h"
  30
  31 /* control endpoint description */
  32 static const struct usb_endpoint_descriptor
  33 ctrl_endpt_out_desc = {
  34         .bLength         = USB_DT_ENDPOINT_SIZE,
  35         .bDescriptorType = USB_DT_ENDPOINT,
  36
  37         .bEndpointAddress = USB_DIR_OUT,
  38         .bmAttributes    = USB_ENDPOINT_XFER_CONTROL,
  39         .wMaxPacketSize  = cpu_to_le16(CTRL_PAYLOAD_MAX),
  40 };
  41
  42 static const struct usb_endpoint_descriptor
  43 ctrl_endpt_in_desc = {
  44         .bLength         = USB_DT_ENDPOINT_SIZE,
  45         .bDescriptorType = USB_DT_ENDPOINT,
  46
  47         .bEndpointAddress = USB_DIR_IN,
  48         .bmAttributes    = USB_ENDPOINT_XFER_CONTROL,
  49         .wMaxPacketSize  = cpu_to_le16(CTRL_PAYLOAD_MAX),
  50 };
  51
  52 static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
  53                        struct td_node *node);
  54 /**
  55  * hw_ep_bit: calculates the bit number
  56  * @num: endpoint number
  57  * @dir: endpoint direction
  58  *
  59  * This function returns bit number
  60  */
  61 static inline int hw_ep_bit(int num, int dir)
  62 {
  63         return num + ((dir == TX) ? 16 : 0);
  64 }
  65
  66 static inline int ep_to_bit(struct ci_hdrc *ci, int n)
  67 {
  68         int fill = 16 - ci->hw_ep_max / 2;
  69
  70         if (n >= ci->hw_ep_max / 2)
  71                 n += fill;
  72
  73         return n;
  74 }
  75
  76 /**
  77  * hw_device_state: enables/disables interrupts (execute without interruption)
  78  * @ci: the controller
  79  * @dma: 0 => disable, !0 => enable and set dma engine
  80  *
  81  * This function returns an error code
  82  */
  83 static int hw_device_state(struct ci_hdrc *ci, u32 dma)
  84 {
  85         if (dma) {
  86                 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
  87                 /* interrupt, error, port change, reset, sleep/suspend */
  88                 hw_write(ci, OP_USBINTR, ~0,
  89                              USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
  90         } else {
  91                 hw_write(ci, OP_USBINTR, ~0, 0);
  92         }
  93         return 0;
  94 }
  95
  96 /**
  97  * hw_ep_flush: flush endpoint fifo (execute without interruption)
  98  * @ci: the controller
  99  * @num: endpoint number
 100  * @dir: endpoint direction
 101  *
 102  * This function returns an error code
 103  */
 104 static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
 105 {
 106         int n = hw_ep_bit(num, dir);
 107
 108         do {
 109                 /* flush any pending transfer */
 110                 hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
 111                 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
 112                         cpu_relax();
 113         } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
 114
 115         return 0;
 116 }
 117
 118 /**
 119  * hw_ep_disable: disables endpoint (execute without interruption)
 120  * @ci: the controller
 121  * @num: endpoint number
 122  * @dir: endpoint direction
 123  *
 124  * This function returns an error code
 125  */
 126 static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
 127 {
 128         hw_write(ci, OP_ENDPTCTRL + num,
 129                  (dir == TX) ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
 130         return 0;
 131 }
 132
 133 /**
 134  * hw_ep_enable: enables endpoint (execute without interruption)
 135  * @ci: the controller
 136  * @num:  endpoint number
 137  * @dir:  endpoint direction
 138  * @type: endpoint type
 139  *
 140  * This function returns an error code
 141  */
 142 static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
 143 {
 144         u32 mask, data;
 145
 146         if (dir == TX) {
 147                 mask  = ENDPTCTRL_TXT;  /* type    */
 148                 data  = type << __ffs(mask);
 149
 150                 mask |= ENDPTCTRL_TXS;  /* unstall */
 151                 mask |= ENDPTCTRL_TXR;  /* reset data toggle */
 152                 data |= ENDPTCTRL_TXR;
 153                 mask |= ENDPTCTRL_TXE;  /* enable  */
 154                 data |= ENDPTCTRL_TXE;
 155         } else {
 156                 mask  = ENDPTCTRL_RXT;  /* type    */
 157                 data  = type << __ffs(mask);
 158
 159                 mask |= ENDPTCTRL_RXS;  /* unstall */
 160                 mask |= ENDPTCTRL_RXR;  /* reset data toggle */
 161                 data |= ENDPTCTRL_RXR;
 162                 mask |= ENDPTCTRL_RXE;  /* enable  */
 163                 data |= ENDPTCTRL_RXE;
 164         }
 165         hw_write(ci, OP_ENDPTCTRL + num, mask, data);
 166         return 0;
 167 }
 168
 169 /**
 170  * hw_ep_get_halt: return endpoint halt status
 171  * @ci: the controller
 172  * @num: endpoint number
 173  * @dir: endpoint direction
 174  *
 175  * This function returns 1 if endpoint halted
 176  */
 177 static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
 178 {
 179         u32 mask = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 180
 181         return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
 182 }
 183
 184 /**
 185  * hw_ep_prime: primes endpoint (execute without interruption)
 186  * @ci: the controller
 187  * @num:     endpoint number
 188  * @dir:     endpoint direction
 189  * @is_ctrl: true if control endpoint
 190  *
 191  * This function returns an error code
 192  */
 193 static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
 194 {
 195         int n = hw_ep_bit(num, dir);
 196
 197         /* Synchronize before ep prime */
 198         wmb();
 199
 200         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 201                 return -EAGAIN;
 202
 203         hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
 204
 205         while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 206                 cpu_relax();
 207         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 208                 return -EAGAIN;
 209
 210         /* status shoult be tested according with manual but it doesn't work */
 211         return 0;
 212 }
 213
 214 /**
 215  * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
 216  *                 without interruption)
 217  * @ci: the controller
 218  * @num:   endpoint number
 219  * @dir:   endpoint direction
 220  * @value: true => stall, false => unstall
 221  *
 222  * This function returns an error code
 223  */
 224 static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
 225 {
 226         if (value != 0 && value != 1)
 227                 return -EINVAL;
 228
 229         do {
 230                 enum ci_hw_regs reg = OP_ENDPTCTRL + num;
 231                 u32 mask_xs = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 232                 u32 mask_xr = (dir == TX) ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
 233
 234                 /* data toggle - reserved for EP0 but it's in ESS */
 235                 hw_write(ci, reg, mask_xs|mask_xr,
 236                           value ? mask_xs : mask_xr);
 237         } while (value != hw_ep_get_halt(ci, num, dir));
 238
 239         return 0;
 240 }
 241
 242 /**
 243  * hw_port_is_high_speed: test if port is high speed
 244  * @ci: the controller
 245  *
 246  * This function returns true if high speed port
 247  */
 248 static int hw_port_is_high_speed(struct ci_hdrc *ci)
 249 {
 250         return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
 251                 hw_read(ci, OP_PORTSC, PORTSC_HSP);
 252 }
 253
 254 /**
 255  * hw_test_and_clear_complete: test & clear complete status (execute without
 256  *                             interruption)
 257  * @ci: the controller
 258  * @n: endpoint number
 259  *
 260  * This function returns complete status
 261  */
 262 static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
 263 {
 264         n = ep_to_bit(ci, n);
 265         return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
 266 }
 267
 268 /**
 269  * hw_test_and_clear_intr_active: test & clear active interrupts (execute
 270  *                                without interruption)
 271  * @ci: the controller
 272  *
 273  * This function returns active interrutps
 274  */
 275 static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
 276 {
 277         u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
 278
 279         hw_write(ci, OP_USBSTS, ~0, reg);
 280         return reg;
 281 }
 282
 283 /**
 284  * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
 285  *                                interruption)
 286  * @ci: the controller
 287  *
 288  * This function returns guard value
 289  */
 290 static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
 291 {
 292         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
 293 }
 294
 295 /**
 296  * hw_test_and_set_setup_guard: test & set setup guard (execute without
 297  *                              interruption)
 298  * @ci: the controller
 299  *
 300  * This function returns guard value
 301  */
 302 static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
 303 {
 304         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
 305 }
 306
 307 /**
 308  * hw_usb_set_address: configures USB address (execute without interruption)
 309  * @ci: the controller
 310  * @value: new USB address
 311  *
 312  * This function explicitly sets the address, without the "USBADRA" (advance)
 313  * feature, which is not supported by older versions of the controller.
 314  */
 315 static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
 316 {
 317         hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
 318                  value << __ffs(DEVICEADDR_USBADR));
 319 }
 320
 321 /**
 322  * hw_usb_reset: restart device after a bus reset (execute without
 323  *               interruption)
 324  * @ci: the controller
 325  *
 326  * This function returns an error code
 327  */
 328 static int hw_usb_reset(struct ci_hdrc *ci)
 329 {
 330         hw_usb_set_address(ci, 0);
 331
 332         /* ESS flushes only at end?!? */
 333         hw_write(ci, OP_ENDPTFLUSH,    ~0, ~0);
 334
 335         /* clear setup token semaphores */
 336         hw_write(ci, OP_ENDPTSETUPSTAT, 0,  0);
 337
 338         /* clear complete status */
 339         hw_write(ci, OP_ENDPTCOMPLETE,  0,  0);
 340
 341         /* wait until all bits cleared */
 342         while (hw_read(ci, OP_ENDPTPRIME, ~0))
 343                 udelay(10);             /* not RTOS friendly */
 344
 345         /* reset all endpoints ? */
 346
 347         /* reset internal status and wait for further instructions
 348            no need to verify the port reset status (ESS does it) */
 349
 350         return 0;
 351 }
 352
 353 /******************************************************************************
 354  * UTIL block
 355  *****************************************************************************/
 356
 357 static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
 358                         unsigned int length, struct scatterlist *s)
 359 {
 360         int i;
 361         u32 temp;
 362         struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
 363                                                   GFP_ATOMIC);
 364
 365         if (node == NULL)
 366                 return -ENOMEM;
 367
 368         node->ptr = dma_pool_zalloc(hwep->td_pool, GFP_ATOMIC, &node->dma);
 369         if (node->ptr == NULL) {
 370                 kfree(node);
 371                 return -ENOMEM;
 372         }
 373
 374         node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
 375         node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
 376         node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
 377         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
 378                 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
 379
 380                 if (hwreq->req.length == 0
 381                                 || hwreq->req.length % hwep->ep.maxpacket)
 382                         mul++;
 383                 node->ptr->token |= cpu_to_le32(mul << __ffs(TD_MULTO));
 384         }
 385
 386         if (s) {
 387                 temp = (u32) (sg_dma_address(s) + hwreq->req.actual);
 388                 node->td_remaining_size = CI_MAX_BUF_SIZE - length;
 389         } else {
 390                 temp = (u32) (hwreq->req.dma + hwreq->req.actual);
 391         }
 392
 393         if (length) {
 394                 node->ptr->page[0] = cpu_to_le32(temp);
 395                 for (i = 1; i < TD_PAGE_COUNT; i++) {
 396                         u32 page = temp + i * CI_HDRC_PAGE_SIZE;
 397                         page &= ~TD_RESERVED_MASK;
 398                         node->ptr->page[i] = cpu_to_le32(page);
 399                 }
 400         }
 401
 402         hwreq->req.actual += length;
 403
 404         if (!list_empty(&hwreq->tds)) {
 405                 /* get the last entry */
 406                 lastnode = list_entry(hwreq->tds.prev,
 407                                 struct td_node, td);
 408                 lastnode->ptr->next = cpu_to_le32(node->dma);
 409         }
 410
 411         INIT_LIST_HEAD(&node->td);
 412         list_add_tail(&node->td, &hwreq->tds);
 413
 414         return 0;
 415 }
 416
 417 /**
 418  * _usb_addr: calculates endpoint address from direction & number
 419  * @ep:  endpoint
 420  */
 421 static inline u8 _usb_addr(struct ci_hw_ep *ep)
 422 {
 423         return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
 424 }
 425
 426 static int prepare_td_for_non_sg(struct ci_hw_ep *hwep,
 427                 struct ci_hw_req *hwreq)
 428 {
 429         unsigned int rest = hwreq->req.length;
 430         int pages = TD_PAGE_COUNT;
 431         int ret = 0;
 432
 433         if (rest == 0) {
 434                 ret = add_td_to_list(hwep, hwreq, 0, NULL);
 435                 if (ret < 0)
 436                         return ret;
 437         }
 438
 439         /*
 440          * The first buffer could be not page aligned.
 441          * In that case we have to span into one extra td.
 442          */
 443         if (hwreq->req.dma % PAGE_SIZE)
 444                 pages--;
 445
 446         while (rest > 0) {
 447                 unsigned int count = min(hwreq->req.length - hwreq->req.actual,
 448                         (unsigned int)(pages * CI_HDRC_PAGE_SIZE));
 449
 450                 ret = add_td_to_list(hwep, hwreq, count, NULL);
 451                 if (ret < 0)
 452                         return ret;
 453
 454                 rest -= count;
 455         }
 456
 457         if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
 458             && (hwreq->req.length % hwep->ep.maxpacket == 0)) {
 459                 ret = add_td_to_list(hwep, hwreq, 0, NULL);
 460                 if (ret < 0)
 461                         return ret;
 462         }
 463
 464         return ret;
 465 }
 466
 467 static int prepare_td_per_sg(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
 468                 struct scatterlist *s)
 469 {
 470         unsigned int rest = sg_dma_len(s);
 471         int ret = 0;
 472
 473         hwreq->req.actual = 0;
 474         while (rest > 0) {
 475                 unsigned int count = min_t(unsigned int, rest,
 476                                 CI_MAX_BUF_SIZE);
 477
 478                 ret = add_td_to_list(hwep, hwreq, count, s);
 479                 if (ret < 0)
 480                         return ret;
 481
 482                 rest -= count;
 483         }
 484
 485         return ret;
 486 }
 487
 488 static void ci_add_buffer_entry(struct td_node *node, struct scatterlist *s)
 489 {
 490         int empty_td_slot_index = (CI_MAX_BUF_SIZE - node->td_remaining_size)
 491                         / CI_HDRC_PAGE_SIZE;
 492         int i;
 493         u32 token;
 494
 495         token = le32_to_cpu(node->ptr->token) + (sg_dma_len(s) << __ffs(TD_TOTAL_BYTES));
 496         node->ptr->token = cpu_to_le32(token);
 497
 498         for (i = empty_td_slot_index; i < TD_PAGE_COUNT; i++) {
 499                 u32 page = (u32) sg_dma_address(s) +
 500                         (i - empty_td_slot_index) * CI_HDRC_PAGE_SIZE;
 501
 502                 page &= ~TD_RESERVED_MASK;
 503                 node->ptr->page[i] = cpu_to_le32(page);
 504         }
 505 }
 506
 507 static int prepare_td_for_sg(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 508 {
 509         struct usb_request *req = &hwreq->req;
 510         struct scatterlist *s = req->sg;
 511         int ret = 0, i = 0;
 512         struct td_node *node = NULL;
 513
 514         if (!s || req->zero || req->length == 0) {
 515                 dev_err(hwep->ci->dev, "not supported operation for sg\n");
 516                 return -EINVAL;
 517         }
 518
 519         while (i++ < req->num_mapped_sgs) {
 520                 if (sg_dma_address(s) % PAGE_SIZE) {
 521                         dev_err(hwep->ci->dev, "not page aligned sg buffer\n");
 522                         return -EINVAL;
 523                 }
 524
 525                 if (node && (node->td_remaining_size >= sg_dma_len(s))) {
 526                         ci_add_buffer_entry(node, s);
 527                         node->td_remaining_size -= sg_dma_len(s);
 528                 } else {
 529                         ret = prepare_td_per_sg(hwep, hwreq, s);
 530                         if (ret)
 531                                 return ret;
 532
 533                         node = list_entry(hwreq->tds.prev,
 534                                 struct td_node, td);
 535                 }
 536
 537                 s = sg_next(s);
 538         }
 539
 540         return ret;
 541 }
 542
 543 /**
 544  * _hardware_enqueue: configures a request at hardware level
 545  * @hwep:   endpoint
 546  * @hwreq:  request
 547  *
 548  * This function returns an error code
 549  */
 550 static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 551 {
 552         struct ci_hdrc *ci = hwep->ci;
 553         int ret = 0;
 554         struct td_node *firstnode, *lastnode;
 555
 556         /* don't queue twice */
 557         if (hwreq->req.status == -EALREADY)
 558                 return -EALREADY;
 559
 560         hwreq->req.status = -EALREADY;
 561
 562         ret = usb_gadget_map_request_by_dev(ci->dev->parent,
 563                                             &hwreq->req, hwep->dir);
 564         if (ret)
 565                 return ret;
 566
 567         if (hwreq->req.num_mapped_sgs)
 568                 ret = prepare_td_for_sg(hwep, hwreq);
 569         else
 570                 ret = prepare_td_for_non_sg(hwep, hwreq);
 571
 572         if (ret)
 573                 return ret;
 574
 575         lastnode = list_entry(hwreq->tds.prev,
 576                 struct td_node, td);
 577
 578         lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
 579         if (!hwreq->req.no_interrupt)
 580                 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
 581
 582         list_for_each_entry_safe(firstnode, lastnode, &hwreq->tds, td)
 583                 trace_ci_prepare_td(hwep, hwreq, firstnode);
 584
 585         firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
 586
 587         wmb();
 588
 589         hwreq->req.actual = 0;
 590         if (!list_empty(&hwep->qh.queue)) {
 591                 struct ci_hw_req *hwreqprev;
 592                 int n = hw_ep_bit(hwep->num, hwep->dir);
 593                 int tmp_stat;
 594                 struct td_node *prevlastnode;
 595                 u32 next = firstnode->dma & TD_ADDR_MASK;
 596
 597                 hwreqprev = list_entry(hwep->qh.queue.prev,
 598                                 struct ci_hw_req, queue);
 599                 prevlastnode = list_entry(hwreqprev->tds.prev,
 600                                 struct td_node, td);
 601
 602                 prevlastnode->ptr->next = cpu_to_le32(next);
 603                 wmb();
 604
 605                 if (ci->rev == CI_REVISION_22) {
 606                         if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
 607                                 reprime_dtd(ci, hwep, prevlastnode);
 608                 }
 609
 610                 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 611                         goto done;
 612                 do {
 613                         hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
 614                         tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
 615                 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
 616                 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
 617                 if (tmp_stat)
 618                         goto done;
 619         }
 620
 621         /*  QH configuration */
 622         hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
 623         hwep->qh.ptr->td.token &=
 624                 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
 625
 626         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
 627                 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
 628
 629                 if (hwreq->req.length == 0
 630                                 || hwreq->req.length % hwep->ep.maxpacket)
 631                         mul++;
 632                 hwep->qh.ptr->cap |= cpu_to_le32(mul << __ffs(QH_MULT));
 633         }
 634
 635         ret = hw_ep_prime(ci, hwep->num, hwep->dir,
 636                            hwep->type == USB_ENDPOINT_XFER_CONTROL);
 637 done:
 638         return ret;
 639 }
 640
 641 /**
 642  * free_pending_td: remove a pending request for the endpoint
 643  * @hwep: endpoint
 644  */
 645 static void free_pending_td(struct ci_hw_ep *hwep)
 646 {
 647         struct td_node *pending = hwep->pending_td;
 648
 649         dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
 650         hwep->pending_td = NULL;
 651         kfree(pending);
 652 }
 653
 654 static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
 655                                            struct td_node *node)
 656 {
 657         hwep->qh.ptr->td.next = cpu_to_le32(node->dma);
 658         hwep->qh.ptr->td.token &=
 659                 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
 660
 661         return hw_ep_prime(ci, hwep->num, hwep->dir,
 662                                 hwep->type == USB_ENDPOINT_XFER_CONTROL);
 663 }
 664
 665 /**
 666  * _hardware_dequeue: handles a request at hardware level
 667  * @hwep: endpoint
 668  * @hwreq:  request
 669  *
 670  * This function returns an error code
 671  */
 672 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 673 {
 674         u32 tmptoken;
 675         struct td_node *node, *tmpnode;
 676         unsigned remaining_length;
 677         unsigned actual = hwreq->req.length;
 678         struct ci_hdrc *ci = hwep->ci;
 679
 680         if (hwreq->req.status != -EALREADY)
 681                 return -EINVAL;
 682
 683         hwreq->req.status = 0;
 684
 685         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 686                 tmptoken = le32_to_cpu(node->ptr->token);
 687                 trace_ci_complete_td(hwep, hwreq, node);
 688                 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
 689                         int n = hw_ep_bit(hwep->num, hwep->dir);
 690
 691                         if (ci->rev == CI_REVISION_24)
 692                                 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
 693                                         reprime_dtd(ci, hwep, node);
 694                         hwreq->req.status = -EALREADY;
 695                         return -EBUSY;
 696                 }
 697
 698                 remaining_length = (tmptoken & TD_TOTAL_BYTES);
 699                 remaining_length >>= __ffs(TD_TOTAL_BYTES);
 700                 actual -= remaining_length;
 701
 702                 hwreq->req.status = tmptoken & TD_STATUS;
 703                 if ((TD_STATUS_HALTED & hwreq->req.status)) {
 704                         hwreq->req.status = -EPIPE;
 705                         break;
 706                 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
 707                         hwreq->req.status = -EPROTO;
 708                         break;
 709                 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
 710                         hwreq->req.status = -EILSEQ;
 711                         break;
 712                 }
 713
 714                 if (remaining_length) {
 715                         if (hwep->dir == TX) {
 716                                 hwreq->req.status = -EPROTO;
 717                                 break;
 718                         }
 719                 }
 720                 /*
 721                  * As the hardware could still address the freed td
 722                  * which will run the udc unusable, the cleanup of the
 723                  * td has to be delayed by one.
 724                  */
 725                 if (hwep->pending_td)
 726                         free_pending_td(hwep);
 727
 728                 hwep->pending_td = node;
 729                 list_del_init(&node->td);
 730         }
 731
 732         usb_gadget_unmap_request_by_dev(hwep->ci->dev->parent,
 733                                         &hwreq->req, hwep->dir);
 734
 735         hwreq->req.actual += actual;
 736
 737         if (hwreq->req.status)
 738                 return hwreq->req.status;
 739
 740         return hwreq->req.actual;
 741 }
 742
 743 /**
 744  * _ep_nuke: dequeues all endpoint requests
 745  * @hwep: endpoint
 746  *
 747  * This function returns an error code
 748  * Caller must hold lock
 749  */
 750 static int _ep_nuke(struct ci_hw_ep *hwep)
 751 __releases(hwep->lock)
 752 __acquires(hwep->lock)
 753 {
 754         struct td_node *node, *tmpnode;
 755         if (hwep == NULL)
 756                 return -EINVAL;
 757
 758         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
 759
 760         while (!list_empty(&hwep->qh.queue)) {
 761
 762                 /* pop oldest request */
 763                 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
 764                                                      struct ci_hw_req, queue);
 765
 766                 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 767                         dma_pool_free(hwep->td_pool, node->ptr, node->dma);
 768                         list_del_init(&node->td);
 769                         node->ptr = NULL;
 770                         kfree(node);
 771                 }
 772
 773                 list_del_init(&hwreq->queue);
 774                 hwreq->req.status = -ESHUTDOWN;
 775
 776                 if (hwreq->req.complete != NULL) {
 777                         spin_unlock(hwep->lock);
 778                         usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
 779                         spin_lock(hwep->lock);
 780                 }
 781         }
 782
 783         if (hwep->pending_td)
 784                 free_pending_td(hwep);
 785
 786         return 0;
 787 }
 788
 789 static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
 790 {
 791         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
 792         int direction, retval = 0;
 793         unsigned long flags;
 794
 795         if (ep == NULL || hwep->ep.desc == NULL)
 796                 return -EINVAL;
 797
 798         if (usb_endpoint_xfer_isoc(hwep->ep.desc))
 799                 return -EOPNOTSUPP;
 800
 801         spin_lock_irqsave(hwep->lock, flags);
 802
 803         if (value && hwep->dir == TX && check_transfer &&
 804                 !list_empty(&hwep->qh.queue) &&
 805                         !usb_endpoint_xfer_control(hwep->ep.desc)) {
 806                 spin_unlock_irqrestore(hwep->lock, flags);
 807                 return -EAGAIN;
 808         }
 809
 810         direction = hwep->dir;
 811         do {
 812                 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
 813
 814                 if (!value)
 815                         hwep->wedge = 0;
 816
 817                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
 818                         hwep->dir = (hwep->dir == TX) ? RX : TX;
 819
 820         } while (hwep->dir != direction);
 821
 822         spin_unlock_irqrestore(hwep->lock, flags);
 823         return retval;
 824 }
 825
 826
 827 /**
 828  * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
 829  * @gadget: gadget
 830  *
 831  * This function returns an error code
 832  */
 833 static int _gadget_stop_activity(struct usb_gadget *gadget)
 834 {
 835         struct usb_ep *ep;
 836         struct ci_hdrc    *ci = container_of(gadget, struct ci_hdrc, gadget);
 837         unsigned long flags;
 838
 839         /* flush all endpoints */
 840         gadget_for_each_ep(ep, gadget) {
 841                 usb_ep_fifo_flush(ep);
 842         }
 843         usb_ep_fifo_flush(&ci->ep0out->ep);
 844         usb_ep_fifo_flush(&ci->ep0in->ep);
 845
 846         /* make sure to disable all endpoints */
 847         gadget_for_each_ep(ep, gadget) {
 848                 usb_ep_disable(ep);
 849         }
 850
 851         if (ci->status != NULL) {
 852                 usb_ep_free_request(&ci->ep0in->ep, ci->status);
 853                 ci->status = NULL;
 854         }
 855
 856         spin_lock_irqsave(&ci->lock, flags);
 857         ci->gadget.speed = USB_SPEED_UNKNOWN;
 858         ci->remote_wakeup = 0;
 859         ci->suspended = 0;
 860         spin_unlock_irqrestore(&ci->lock, flags);
 861
 862         return 0;
 863 }
 864
 865 /******************************************************************************
 866  * ISR block
 867  *****************************************************************************/
 868 /**
 869  * isr_reset_handler: USB reset interrupt handler
 870  * @ci: UDC device
 871  *
 872  * This function resets USB engine after a bus reset occurred
 873  */
 874 static void isr_reset_handler(struct ci_hdrc *ci)
 875 __releases(ci->lock)
 876 __acquires(ci->lock)
 877 {
 878         int retval;
 879
 880         spin_unlock(&ci->lock);
 881         if (ci->gadget.speed != USB_SPEED_UNKNOWN)
 882                 usb_gadget_udc_reset(&ci->gadget, ci->driver);
 883
 884         retval = _gadget_stop_activity(&ci->gadget);
 885         if (retval)
 886                 goto done;
 887
 888         retval = hw_usb_reset(ci);
 889         if (retval)
 890                 goto done;
 891
 892         ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
 893         if (ci->status == NULL)
 894                 retval = -ENOMEM;
 895
 896 done:
 897         spin_lock(&ci->lock);
 898
 899         if (retval)
 900                 dev_err(ci->dev, "error: %i\n", retval);
 901 }
 902
 903 /**
 904  * isr_get_status_complete: get_status request complete function
 905  * @ep:  endpoint
 906  * @req: request handled
 907  *
 908  * Caller must release lock
 909  */
 910 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
 911 {
 912         if (ep == NULL || req == NULL)
 913                 return;
 914
 915         kfree(req->buf);
 916         usb_ep_free_request(ep, req);
 917 }
 918
 919 /**
 920  * _ep_queue: queues (submits) an I/O request to an endpoint
 921  * @ep:        endpoint
 922  * @req:       request
 923  * @gfp_flags: GFP flags (not used)
 924  *
 925  * Caller must hold lock
 926  * This function returns an error code
 927  */
 928 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
 929                     gfp_t __maybe_unused gfp_flags)
 930 {
 931         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
 932         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
 933         struct ci_hdrc *ci = hwep->ci;
 934         int retval = 0;
 935
 936         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
 937                 return -EINVAL;
 938
 939         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
 940                 if (req->length)
 941                         hwep = (ci->ep0_dir == RX) ?
 942                                ci->ep0out : ci->ep0in;
 943                 if (!list_empty(&hwep->qh.queue)) {
 944                         _ep_nuke(hwep);
 945                         dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
 946                                  _usb_addr(hwep));
 947                 }
 948         }
 949
 950         if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
 951             hwreq->req.length > hwep->ep.mult * hwep->ep.maxpacket) {
 952                 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
 953                 return -EMSGSIZE;
 954         }
 955
 956         /* first nuke then test link, e.g. previous status has not sent */
 957         if (!list_empty(&hwreq->queue)) {
 958                 dev_err(hwep->ci->dev, "request already in queue\n");
 959                 return -EBUSY;
 960         }
 961
 962         /* push request */
 963         hwreq->req.status = -EINPROGRESS;
 964         hwreq->req.actual = 0;
 965
 966         retval = _hardware_enqueue(hwep, hwreq);
 967
 968         if (retval == -EALREADY)
 969                 retval = 0;
 970         if (!retval)
 971                 list_add_tail(&hwreq->queue, &hwep->qh.queue);
 972
 973         return retval;
 974 }
 975
 976 /**
 977  * isr_get_status_response: get_status request response
 978  * @ci: ci struct
 979  * @setup: setup request packet
 980  *
 981  * This function returns an error code
 982  */
 983 static int isr_get_status_response(struct ci_hdrc *ci,
 984                                    struct usb_ctrlrequest *setup)
 985 __releases(hwep->lock)
 986 __acquires(hwep->lock)
 987 {
 988         struct ci_hw_ep *hwep = ci->ep0in;
 989         struct usb_request *req = NULL;
 990         gfp_t gfp_flags = GFP_ATOMIC;
 991         int dir, num, retval;
 992
 993         if (hwep == NULL || setup == NULL)
 994                 return -EINVAL;
 995
 996         spin_unlock(hwep->lock);
 997         req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
 998         spin_lock(hwep->lock);
 999         if (req == NULL)
1000                 return -ENOMEM;
1001
1002         req->complete = isr_get_status_complete;
1003         req->length   = 2;
1004         req->buf      = kzalloc(req->length, gfp_flags);
1005         if (req->buf == NULL) {
1006                 retval = -ENOMEM;
1007                 goto err_free_req;
1008         }
1009
1010         if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
1011                 *(u16 *)req->buf = (ci->remote_wakeup << 1) |
1012                         ci->gadget.is_selfpowered;
1013         } else if ((setup->bRequestType & USB_RECIP_MASK) \
1014                    == USB_RECIP_ENDPOINT) {
1015                 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
1016                         TX : RX;
1017                 num =  le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
1018                 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
1019         }
1020         /* else do nothing; reserved for future use */
1021
1022         retval = _ep_queue(&hwep->ep, req, gfp_flags);
1023         if (retval)
1024                 goto err_free_buf;
1025
1026         return 0;
1027
1028  err_free_buf:
1029         kfree(req->buf);
1030  err_free_req:
1031         spin_unlock(hwep->lock);
1032         usb_ep_free_request(&hwep->ep, req);
1033         spin_lock(hwep->lock);
1034         return retval;
1035 }
1036
1037 /**
1038  * isr_setup_status_complete: setup_status request complete function
1039  * @ep:  endpoint
1040  * @req: request handled
1041  *
1042  * Caller must release lock. Put the port in test mode if test mode
1043  * feature is selected.
1044  */
1045 static void
1046 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
1047 {
1048         struct ci_hdrc *ci = req->context;
1049         unsigned long flags;
1050
1051         if (ci->setaddr) {
1052                 hw_usb_set_address(ci, ci->address);
1053                 ci->setaddr = false;
1054                 if (ci->address)
1055                         usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
1056         }
1057
1058         spin_lock_irqsave(&ci->lock, flags);
1059         if (ci->test_mode)
1060                 hw_port_test_set(ci, ci->test_mode);
1061         spin_unlock_irqrestore(&ci->lock, flags);
1062 }
1063
1064 /**
1065  * isr_setup_status_phase: queues the status phase of a setup transation
1066  * @ci: ci struct
1067  *
1068  * This function returns an error code
1069  */
1070 static int isr_setup_status_phase(struct ci_hdrc *ci)
1071 {
1072         struct ci_hw_ep *hwep;
1073
1074         /*
1075          * Unexpected USB controller behavior, caused by bad signal integrity
1076          * or ground reference problems, can lead to isr_setup_status_phase
1077          * being called with ci->status equal to NULL.
1078          * If this situation occurs, you should review your USB hardware design.
1079          */
1080         if (WARN_ON_ONCE(!ci->status))
1081                 return -EPIPE;
1082
1083         hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
1084         ci->status->context = ci;
1085         ci->status->complete = isr_setup_status_complete;
1086
1087         return _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
1088 }
1089
1090 /**
1091  * isr_tr_complete_low: transaction complete low level handler
1092  * @hwep: endpoint
1093  *
1094  * This function returns an error code
1095  * Caller must hold lock
1096  */
1097 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
1098 __releases(hwep->lock)
1099 __acquires(hwep->lock)
1100 {
1101         struct ci_hw_req *hwreq, *hwreqtemp;
1102         struct ci_hw_ep *hweptemp = hwep;
1103         int retval = 0;
1104
1105         list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
1106                         queue) {
1107                 retval = _hardware_dequeue(hwep, hwreq);
1108                 if (retval < 0)
1109                         break;
1110                 list_del_init(&hwreq->queue);
1111                 if (hwreq->req.complete != NULL) {
1112                         spin_unlock(hwep->lock);
1113                         if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
1114                                         hwreq->req.length)
1115                                 hweptemp = hwep->ci->ep0in;
1116                         usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
1117                         spin_lock(hwep->lock);
1118                 }
1119         }
1120
1121         if (retval == -EBUSY)
1122                 retval = 0;
1123
1124         return retval;
1125 }
1126
1127 static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
1128 {
1129         dev_warn(&ci->gadget.dev,
1130                 "connect the device to an alternate port if you want HNP\n");
1131         return isr_setup_status_phase(ci);
1132 }
1133
1134 /**
1135  * isr_setup_packet_handler: setup packet handler
1136  * @ci: UDC descriptor
1137  *
1138  * This function handles setup packet
1139  */
1140 static void isr_setup_packet_handler(struct ci_hdrc *ci)
1141 __releases(ci->lock)
1142 __acquires(ci->lock)
1143 {
1144         struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1145         struct usb_ctrlrequest req;
1146         int type, num, dir, err = -EINVAL;
1147         u8 tmode = 0;
1148
1149         /*
1150          * Flush data and handshake transactions of previous
1151          * setup packet.
1152          */
1153         _ep_nuke(ci->ep0out);
1154         _ep_nuke(ci->ep0in);
1155
1156         /* read_setup_packet */
1157         do {
1158                 hw_test_and_set_setup_guard(ci);
1159                 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1160         } while (!hw_test_and_clear_setup_guard(ci));
1161
1162         type = req.bRequestType;
1163
1164         ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1165
1166         switch (req.bRequest) {
1167         case USB_REQ_CLEAR_FEATURE:
1168                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1169                                 le16_to_cpu(req.wValue) ==
1170                                 USB_ENDPOINT_HALT) {
1171                         if (req.wLength != 0)
1172                                 break;
1173                         num  = le16_to_cpu(req.wIndex);
1174                         dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1175                         num &= USB_ENDPOINT_NUMBER_MASK;
1176                         if (dir == TX)
1177                                 num += ci->hw_ep_max / 2;
1178                         if (!ci->ci_hw_ep[num].wedge) {
1179                                 spin_unlock(&ci->lock);
1180                                 err = usb_ep_clear_halt(
1181                                         &ci->ci_hw_ep[num].ep);
1182                                 spin_lock(&ci->lock);
1183                                 if (err)
1184                                         break;
1185                         }
1186                         err = isr_setup_status_phase(ci);
1187                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1188                                 le16_to_cpu(req.wValue) ==
1189                                 USB_DEVICE_REMOTE_WAKEUP) {
1190                         if (req.wLength != 0)
1191                                 break;
1192                         ci->remote_wakeup = 0;
1193                         err = isr_setup_status_phase(ci);
1194                 } else {
1195                         goto delegate;
1196                 }
1197                 break;
1198         case USB_REQ_GET_STATUS:
1199                 if ((type != (USB_DIR_IN|USB_RECIP_DEVICE) ||
1200                         le16_to_cpu(req.wIndex) == OTG_STS_SELECTOR) &&
1201                     type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1202                     type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1203                         goto delegate;
1204                 if (le16_to_cpu(req.wLength) != 2 ||
1205                     le16_to_cpu(req.wValue)  != 0)
1206                         break;
1207                 err = isr_get_status_response(ci, &req);
1208                 break;
1209         case USB_REQ_SET_ADDRESS:
1210                 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1211                         goto delegate;
1212                 if (le16_to_cpu(req.wLength) != 0 ||
1213                     le16_to_cpu(req.wIndex)  != 0)
1214                         break;
1215                 ci->address = (u8)le16_to_cpu(req.wValue);
1216                 ci->setaddr = true;
1217                 err = isr_setup_status_phase(ci);
1218                 break;
1219         case USB_REQ_SET_FEATURE:
1220                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1221                                 le16_to_cpu(req.wValue) ==
1222                                 USB_ENDPOINT_HALT) {
1223                         if (req.wLength != 0)
1224                                 break;
1225                         num  = le16_to_cpu(req.wIndex);
1226                         dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1227                         num &= USB_ENDPOINT_NUMBER_MASK;
1228                         if (dir == TX)
1229                                 num += ci->hw_ep_max / 2;
1230
1231                         spin_unlock(&ci->lock);
1232                         err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1233                         spin_lock(&ci->lock);
1234                         if (!err)
1235                                 isr_setup_status_phase(ci);
1236                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1237                         if (req.wLength != 0)
1238                                 break;
1239                         switch (le16_to_cpu(req.wValue)) {
1240                         case USB_DEVICE_REMOTE_WAKEUP:
1241                                 ci->remote_wakeup = 1;
1242                                 err = isr_setup_status_phase(ci);
1243                                 break;
1244                         case USB_DEVICE_TEST_MODE:
1245                                 tmode = le16_to_cpu(req.wIndex) >> 8;
1246                                 switch (tmode) {
1247                                 case USB_TEST_J:
1248                                 case USB_TEST_K:
1249                                 case USB_TEST_SE0_NAK:
1250                                 case USB_TEST_PACKET:
1251                                 case USB_TEST_FORCE_ENABLE:
1252                                         ci->test_mode = tmode;
1253                                         err = isr_setup_status_phase(
1254                                                         ci);
1255                                         break;
1256                                 default:
1257                                         break;
1258                                 }
1259                                 break;
1260                         case USB_DEVICE_B_HNP_ENABLE:
1261                                 if (ci_otg_is_fsm_mode(ci)) {
1262                                         ci->gadget.b_hnp_enable = 1;
1263                                         err = isr_setup_status_phase(
1264                                                         ci);
1265                                 }
1266                                 break;
1267                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1268                                 if (ci_otg_is_fsm_mode(ci))
1269                                         err = otg_a_alt_hnp_support(ci);
1270                                 break;
1271                         case USB_DEVICE_A_HNP_SUPPORT:
1272                                 if (ci_otg_is_fsm_mode(ci)) {
1273                                         ci->gadget.a_hnp_support = 1;
1274                                         err = isr_setup_status_phase(
1275                                                         ci);
1276                                 }
1277                                 break;
1278                         default:
1279                                 goto delegate;
1280                         }
1281                 } else {
1282                         goto delegate;
1283                 }
1284                 break;
1285         default:
1286 delegate:
1287                 if (req.wLength == 0)   /* no data phase */
1288                         ci->ep0_dir = TX;
1289
1290                 spin_unlock(&ci->lock);
1291                 err = ci->driver->setup(&ci->gadget, &req);
1292                 spin_lock(&ci->lock);
1293                 break;
1294         }
1295
1296         if (err < 0) {
1297                 spin_unlock(&ci->lock);
1298                 if (_ep_set_halt(&hwep->ep, 1, false))
1299                         dev_err(ci->dev, "error: _ep_set_halt\n");
1300                 spin_lock(&ci->lock);
1301         }
1302 }
1303
1304 /**
1305  * isr_tr_complete_handler: transaction complete interrupt handler
1306  * @ci: UDC descriptor
1307  *
1308  * This function handles traffic events
1309  */
1310 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1311 __releases(ci->lock)
1312 __acquires(ci->lock)
1313 {
1314         unsigned i;
1315         int err;
1316
1317         for (i = 0; i < ci->hw_ep_max; i++) {
1318                 struct ci_hw_ep *hwep  = &ci->ci_hw_ep[i];
1319
1320                 if (hwep->ep.desc == NULL)
1321                         continue;   /* not configured */
1322
1323                 if (hw_test_and_clear_complete(ci, i)) {
1324                         err = isr_tr_complete_low(hwep);
1325                         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1326                                 if (err > 0)   /* needs status phase */
1327                                         err = isr_setup_status_phase(ci);
1328                                 if (err < 0) {
1329                                         spin_unlock(&ci->lock);
1330                                         if (_ep_set_halt(&hwep->ep, 1, false))
1331                                                 dev_err(ci->dev,
1332                                                 "error: _ep_set_halt\n");
1333                                         spin_lock(&ci->lock);
1334                                 }
1335                         }
1336                 }
1337
1338                 /* Only handle setup packet below */
1339                 if (i == 0 &&
1340                         hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1341                         isr_setup_packet_handler(ci);
1342         }
1343 }
1344
1345 /******************************************************************************
1346  * ENDPT block
1347  *****************************************************************************/
1348 /*
1349  * ep_enable: configure endpoint, making it usable
1350  *
1351  * Check usb_ep_enable() at "usb_gadget.h" for details
1352  */
1353 static int ep_enable(struct usb_ep *ep,
1354                      const struct usb_endpoint_descriptor *desc)
1355 {
1356         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1357         int retval = 0;
1358         unsigned long flags;
1359         u32 cap = 0;
1360
1361         if (ep == NULL || desc == NULL)
1362                 return -EINVAL;
1363
1364         spin_lock_irqsave(hwep->lock, flags);
1365
1366         /* only internal SW should enable ctrl endpts */
1367
1368         if (!list_empty(&hwep->qh.queue)) {
1369                 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1370                 spin_unlock_irqrestore(hwep->lock, flags);
1371                 return -EBUSY;
1372         }
1373
1374         hwep->ep.desc = desc;
1375
1376         hwep->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
1377         hwep->num  = usb_endpoint_num(desc);
1378         hwep->type = usb_endpoint_type(desc);
1379
1380         hwep->ep.maxpacket = usb_endpoint_maxp(desc);
1381         hwep->ep.mult = usb_endpoint_maxp_mult(desc);
1382
1383         if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1384                 cap |= QH_IOS;
1385
1386         cap |= QH_ZLT;
1387         cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1388         /*
1389          * For ISO-TX, we set mult at QH as the largest value, and use
1390          * MultO at TD as real mult value.
1391          */
1392         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1393                 cap |= 3 << __ffs(QH_MULT);
1394
1395         hwep->qh.ptr->cap = cpu_to_le32(cap);
1396
1397         hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE);   /* needed? */
1398
1399         if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1400                 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1401                 retval = -EINVAL;
1402         }
1403
1404         /*
1405          * Enable endpoints in the HW other than ep0 as ep0
1406          * is always enabled
1407          */
1408         if (hwep->num)
1409                 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1410                                        hwep->type);
1411
1412         spin_unlock_irqrestore(hwep->lock, flags);
1413         return retval;
1414 }
1415
1416 /*
1417  * ep_disable: endpoint is no longer usable
1418  *
1419  * Check usb_ep_disable() at "usb_gadget.h" for details
1420  */
1421 static int ep_disable(struct usb_ep *ep)
1422 {
1423         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1424         int direction, retval = 0;
1425         unsigned long flags;
1426
1427         if (ep == NULL)
1428                 return -EINVAL;
1429         else if (hwep->ep.desc == NULL)
1430                 return -EBUSY;
1431
1432         spin_lock_irqsave(hwep->lock, flags);
1433         if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1434                 spin_unlock_irqrestore(hwep->lock, flags);
1435                 return 0;
1436         }
1437
1438         /* only internal SW should disable ctrl endpts */
1439
1440         direction = hwep->dir;
1441         do {
1442                 retval |= _ep_nuke(hwep);
1443                 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1444
1445                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1446                         hwep->dir = (hwep->dir == TX) ? RX : TX;
1447
1448         } while (hwep->dir != direction);
1449
1450         hwep->ep.desc = NULL;
1451
1452         spin_unlock_irqrestore(hwep->lock, flags);
1453         return retval;
1454 }
1455
1456 /*
1457  * ep_alloc_request: allocate a request object to use with this endpoint
1458  *
1459  * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1460  */
1461 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1462 {
1463         struct ci_hw_req *hwreq = NULL;
1464
1465         if (ep == NULL)
1466                 return NULL;
1467
1468         hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1469         if (hwreq != NULL) {
1470                 INIT_LIST_HEAD(&hwreq->queue);
1471                 INIT_LIST_HEAD(&hwreq->tds);
1472         }
1473
1474         return (hwreq == NULL) ? NULL : &hwreq->req;
1475 }
1476
1477 /*
1478  * ep_free_request: frees a request object
1479  *
1480  * Check usb_ep_free_request() at "usb_gadget.h" for details
1481  */
1482 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1483 {
1484         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1485         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1486         struct td_node *node, *tmpnode;
1487         unsigned long flags;
1488
1489         if (ep == NULL || req == NULL) {
1490                 return;
1491         } else if (!list_empty(&hwreq->queue)) {
1492                 dev_err(hwep->ci->dev, "freeing queued request\n");
1493                 return;
1494         }
1495
1496         spin_lock_irqsave(hwep->lock, flags);
1497
1498         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1499                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1500                 list_del_init(&node->td);
1501                 node->ptr = NULL;
1502                 kfree(node);
1503         }
1504
1505         kfree(hwreq);
1506
1507         spin_unlock_irqrestore(hwep->lock, flags);
1508 }
1509
1510 /*
1511  * ep_queue: queues (submits) an I/O request to an endpoint
1512  *
1513  * Check usb_ep_queue()* at usb_gadget.h" for details
1514  */
1515 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1516                     gfp_t __maybe_unused gfp_flags)
1517 {
1518         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1519         int retval = 0;
1520         unsigned long flags;
1521
1522         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1523                 return -EINVAL;
1524
1525         spin_lock_irqsave(hwep->lock, flags);
1526         if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1527                 spin_unlock_irqrestore(hwep->lock, flags);
1528                 return 0;
1529         }
1530         retval = _ep_queue(ep, req, gfp_flags);
1531         spin_unlock_irqrestore(hwep->lock, flags);
1532         return retval;
1533 }
1534
1535 /*
1536  * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1537  *
1538  * Check usb_ep_dequeue() at "usb_gadget.h" for details
1539  */
1540 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1541 {
1542         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1543         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1544         unsigned long flags;
1545         struct td_node *node, *tmpnode;
1546
1547         if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1548                 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1549                 list_empty(&hwep->qh.queue))
1550                 return -EINVAL;
1551
1552         spin_lock_irqsave(hwep->lock, flags);
1553         if (hwep->ci->gadget.speed != USB_SPEED_UNKNOWN)
1554                 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1555
1556         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1557                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1558                 list_del(&node->td);
1559                 kfree(node);
1560         }
1561
1562         /* pop request */
1563         list_del_init(&hwreq->queue);
1564
1565         usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1566
1567         req->status = -ECONNRESET;
1568
1569         if (hwreq->req.complete != NULL) {
1570                 spin_unlock(hwep->lock);
1571                 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1572                 spin_lock(hwep->lock);
1573         }
1574
1575         spin_unlock_irqrestore(hwep->lock, flags);
1576         return 0;
1577 }
1578
1579 /*
1580  * ep_set_halt: sets the endpoint halt feature
1581  *
1582  * Check usb_ep_set_halt() at "usb_gadget.h" for details
1583  */
1584 static int ep_set_halt(struct usb_ep *ep, int value)
1585 {
1586         return _ep_set_halt(ep, value, true);
1587 }
1588
1589 /*
1590  * ep_set_wedge: sets the halt feature and ignores clear requests
1591  *
1592  * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1593  */
1594 static int ep_set_wedge(struct usb_ep *ep)
1595 {
1596         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1597         unsigned long flags;
1598
1599         if (ep == NULL || hwep->ep.desc == NULL)
1600                 return -EINVAL;
1601
1602         spin_lock_irqsave(hwep->lock, flags);
1603         hwep->wedge = 1;
1604         spin_unlock_irqrestore(hwep->lock, flags);
1605
1606         return usb_ep_set_halt(ep);
1607 }
1608
1609 /*
1610  * ep_fifo_flush: flushes contents of a fifo
1611  *
1612  * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1613  */
1614 static void ep_fifo_flush(struct usb_ep *ep)
1615 {
1616         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1617         unsigned long flags;
1618
1619         if (ep == NULL) {
1620                 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1621                 return;
1622         }
1623
1624         spin_lock_irqsave(hwep->lock, flags);
1625         if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1626                 spin_unlock_irqrestore(hwep->lock, flags);
1627                 return;
1628         }
1629
1630         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1631
1632         spin_unlock_irqrestore(hwep->lock, flags);
1633 }
1634
1635 /*
1636  * Endpoint-specific part of the API to the USB controller hardware
1637  * Check "usb_gadget.h" for details
1638  */
1639 static const struct usb_ep_ops usb_ep_ops = {
1640         .enable        = ep_enable,
1641         .disable       = ep_disable,
1642         .alloc_request = ep_alloc_request,
1643         .free_request  = ep_free_request,
1644         .queue         = ep_queue,
1645         .dequeue       = ep_dequeue,
1646         .set_halt      = ep_set_halt,
1647         .set_wedge     = ep_set_wedge,
1648         .fifo_flush    = ep_fifo_flush,
1649 };
1650
1651 /******************************************************************************
1652  * GADGET block
1653  *****************************************************************************/
1654 /*
1655  * ci_hdrc_gadget_connect: caller makes sure gadget driver is binded
1656  */
1657 static void ci_hdrc_gadget_connect(struct usb_gadget *_gadget, int is_active)
1658 {
1659         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1660
1661         if (is_active) {
1662                 pm_runtime_get_sync(ci->dev);
1663                 hw_device_reset(ci);
1664                 spin_lock_irq(&ci->lock);
1665                 if (ci->driver) {
1666                         hw_device_state(ci, ci->ep0out->qh.dma);
1667                         usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1668                         spin_unlock_irq(&ci->lock);
1669                         usb_udc_vbus_handler(_gadget, true);
1670                 } else {
1671                         spin_unlock_irq(&ci->lock);
1672                 }
1673         } else {
1674                 usb_udc_vbus_handler(_gadget, false);
1675                 if (ci->driver)
1676                         ci->driver->disconnect(&ci->gadget);
1677                 hw_device_state(ci, 0);
1678                 if (ci->platdata->notify_event)
1679                         ci->platdata->notify_event(ci,
1680                         CI_HDRC_CONTROLLER_STOPPED_EVENT);
1681                 _gadget_stop_activity(&ci->gadget);
1682                 pm_runtime_put_sync(ci->dev);
1683                 usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1684         }
1685 }
1686
1687 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1688 {
1689         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1690         unsigned long flags;
1691         int ret = 0;
1692
1693         spin_lock_irqsave(&ci->lock, flags);
1694         ci->vbus_active = is_active;
1695         spin_unlock_irqrestore(&ci->lock, flags);
1696
1697         if (ci->usb_phy)
1698                 usb_phy_set_charger_state(ci->usb_phy, is_active ?
1699                         USB_CHARGER_PRESENT : USB_CHARGER_ABSENT);
1700
1701         if (ci->platdata->notify_event)
1702                 ret = ci->platdata->notify_event(ci,
1703                                 CI_HDRC_CONTROLLER_VBUS_EVENT);
1704
1705         if (ci->driver)
1706                 ci_hdrc_gadget_connect(_gadget, is_active);
1707
1708         return ret;
1709 }
1710
1711 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1712 {
1713         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1714         unsigned long flags;
1715         int ret = 0;
1716
1717         spin_lock_irqsave(&ci->lock, flags);
1718         if (ci->gadget.speed == USB_SPEED_UNKNOWN) {
1719                 spin_unlock_irqrestore(&ci->lock, flags);
1720                 return 0;
1721         }
1722         if (!ci->remote_wakeup) {
1723                 ret = -EOPNOTSUPP;
1724                 goto out;
1725         }
1726         if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1727                 ret = -EINVAL;
1728                 goto out;
1729         }
1730         hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1731 out:
1732         spin_unlock_irqrestore(&ci->lock, flags);
1733         return ret;
1734 }
1735
1736 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1737 {
1738         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1739
1740         if (ci->usb_phy)
1741                 return usb_phy_set_power(ci->usb_phy, ma);
1742         return -ENOTSUPP;
1743 }
1744
1745 static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1746 {
1747         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1748         struct ci_hw_ep *hwep = ci->ep0in;
1749         unsigned long flags;
1750
1751         spin_lock_irqsave(hwep->lock, flags);
1752         _gadget->is_selfpowered = (is_on != 0);
1753         spin_unlock_irqrestore(hwep->lock, flags);
1754
1755         return 0;
1756 }
1757
1758 /* Change Data+ pullup status
1759  * this func is used by usb_gadget_connect/disconnect
1760  */
1761 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1762 {
1763         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1764
1765         /*
1766          * Data+ pullup controlled by OTG state machine in OTG fsm mode;
1767          * and don't touch Data+ in host mode for dual role config.
1768          */
1769         if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST)
1770                 return 0;
1771
1772         pm_runtime_get_sync(ci->dev);
1773         if (is_on)
1774                 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1775         else
1776                 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1777         pm_runtime_put_sync(ci->dev);
1778
1779         return 0;
1780 }
1781
1782 static int ci_udc_start(struct usb_gadget *gadget,
1783                          struct usb_gadget_driver *driver);
1784 static int ci_udc_stop(struct usb_gadget *gadget);
1785
1786 /* Match ISOC IN from the highest endpoint */
1787 static struct usb_ep *ci_udc_match_ep(struct usb_gadget *gadget,
1788                               struct usb_endpoint_descriptor *desc,
1789                               struct usb_ss_ep_comp_descriptor *comp_desc)
1790 {
1791         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1792         struct usb_ep *ep;
1793
1794         if (usb_endpoint_xfer_isoc(desc) && usb_endpoint_dir_in(desc)) {
1795                 list_for_each_entry_reverse(ep, &ci->gadget.ep_list, ep_list) {
1796                         if (ep->caps.dir_in && !ep->claimed)
1797                                 return ep;
1798                 }
1799         }
1800
1801         return NULL;
1802 }
1803
1804 /*
1805  * Device operations part of the API to the USB controller hardware,
1806  * which don't involve endpoints (or i/o)
1807  * Check  "usb_gadget.h" for details
1808  */
1809 static const struct usb_gadget_ops usb_gadget_ops = {
1810         .vbus_session   = ci_udc_vbus_session,
1811         .wakeup         = ci_udc_wakeup,
1812         .set_selfpowered        = ci_udc_selfpowered,
1813         .pullup         = ci_udc_pullup,
1814         .vbus_draw      = ci_udc_vbus_draw,
1815         .udc_start      = ci_udc_start,
1816         .udc_stop       = ci_udc_stop,
1817         .match_ep       = ci_udc_match_ep,
1818 };
1819
1820 static int init_eps(struct ci_hdrc *ci)
1821 {
1822         int retval = 0, i, j;
1823
1824         for (i = 0; i < ci->hw_ep_max/2; i++)
1825                 for (j = RX; j <= TX; j++) {
1826                         int k = i + j * ci->hw_ep_max/2;
1827                         struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1828
1829                         scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1830                                         (j == TX)  ? "in" : "out");
1831
1832                         hwep->ci          = ci;
1833                         hwep->lock         = &ci->lock;
1834                         hwep->td_pool      = ci->td_pool;
1835
1836                         hwep->ep.name      = hwep->name;
1837                         hwep->ep.ops       = &usb_ep_ops;
1838
1839                         if (i == 0) {
1840                                 hwep->ep.caps.type_control = true;
1841                         } else {
1842                                 hwep->ep.caps.type_iso = true;
1843                                 hwep->ep.caps.type_bulk = true;
1844                                 hwep->ep.caps.type_int = true;
1845                         }
1846
1847                         if (j == TX)
1848                                 hwep->ep.caps.dir_in = true;
1849                         else
1850                                 hwep->ep.caps.dir_out = true;
1851
1852                         /*
1853                          * for ep0: maxP defined in desc, for other
1854                          * eps, maxP is set by epautoconfig() called
1855                          * by gadget layer
1856                          */
1857                         usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1858
1859                         INIT_LIST_HEAD(&hwep->qh.queue);
1860                         hwep->qh.ptr = dma_pool_zalloc(ci->qh_pool, GFP_KERNEL,
1861                                                        &hwep->qh.dma);
1862                         if (hwep->qh.ptr == NULL)
1863                                 retval = -ENOMEM;
1864
1865                         /*
1866                          * set up shorthands for ep0 out and in endpoints,
1867                          * don't add to gadget's ep_list
1868                          */
1869                         if (i == 0) {
1870                                 if (j == RX)
1871                                         ci->ep0out = hwep;
1872                                 else
1873                                         ci->ep0in = hwep;
1874
1875                                 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1876                                 continue;
1877                         }
1878
1879                         list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1880                 }
1881
1882         return retval;
1883 }
1884
1885 static void destroy_eps(struct ci_hdrc *ci)
1886 {
1887         int i;
1888
1889         for (i = 0; i < ci->hw_ep_max; i++) {
1890                 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1891
1892                 if (hwep->pending_td)
1893                         free_pending_td(hwep);
1894                 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1895         }
1896 }
1897
1898 /**
1899  * ci_udc_start: register a gadget driver
1900  * @gadget: our gadget
1901  * @driver: the driver being registered
1902  *
1903  * Interrupts are enabled here.
1904  */
1905 static int ci_udc_start(struct usb_gadget *gadget,
1906                          struct usb_gadget_driver *driver)
1907 {
1908         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1909         int retval;
1910
1911         if (driver->disconnect == NULL)
1912                 return -EINVAL;
1913
1914         ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1915         retval = usb_ep_enable(&ci->ep0out->ep);
1916         if (retval)
1917                 return retval;
1918
1919         ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1920         retval = usb_ep_enable(&ci->ep0in->ep);
1921         if (retval)
1922                 return retval;
1923
1924         ci->driver = driver;
1925
1926         /* Start otg fsm for B-device */
1927         if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1928                 ci_hdrc_otg_fsm_start(ci);
1929                 return retval;
1930         }
1931
1932         if (ci->vbus_active)
1933                 ci_hdrc_gadget_connect(gadget, 1);
1934         else
1935                 usb_udc_vbus_handler(&ci->gadget, false);
1936
1937         return retval;
1938 }
1939
1940 static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
1941 {
1942         if (!ci_otg_is_fsm_mode(ci))
1943                 return;
1944
1945         mutex_lock(&ci->fsm.lock);
1946         if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
1947                 ci->fsm.a_bidl_adis_tmout = 1;
1948                 ci_hdrc_otg_fsm_start(ci);
1949         } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
1950                 ci->fsm.protocol = PROTO_UNDEF;
1951                 ci->fsm.otg->state = OTG_STATE_UNDEFINED;
1952         }
1953         mutex_unlock(&ci->fsm.lock);
1954 }
1955
1956 /*
1957  * ci_udc_stop: unregister a gadget driver
1958  */
1959 static int ci_udc_stop(struct usb_gadget *gadget)
1960 {
1961         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1962         unsigned long flags;
1963
1964         spin_lock_irqsave(&ci->lock, flags);
1965         ci->driver = NULL;
1966
1967         if (ci->vbus_active) {
1968                 hw_device_state(ci, 0);
1969                 spin_unlock_irqrestore(&ci->lock, flags);
1970                 if (ci->platdata->notify_event)
1971                         ci->platdata->notify_event(ci,
1972                         CI_HDRC_CONTROLLER_STOPPED_EVENT);
1973                 _gadget_stop_activity(&ci->gadget);
1974                 spin_lock_irqsave(&ci->lock, flags);
1975                 pm_runtime_put(ci->dev);
1976         }
1977
1978         spin_unlock_irqrestore(&ci->lock, flags);
1979
1980         ci_udc_stop_for_otg_fsm(ci);
1981         return 0;
1982 }
1983
1984 /******************************************************************************
1985  * BUS block
1986  *****************************************************************************/
1987 /*
1988  * udc_irq: ci interrupt handler
1989  *
1990  * This function returns IRQ_HANDLED if the IRQ has been handled
1991  * It locks access to registers
1992  */
1993 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1994 {
1995         irqreturn_t retval;
1996         u32 intr;
1997
1998         if (ci == NULL)
1999                 return IRQ_HANDLED;
2000
2001         spin_lock(&ci->lock);
2002
2003         if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
2004                 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
2005                                 USBMODE_CM_DC) {
2006                         spin_unlock(&ci->lock);
2007                         return IRQ_NONE;
2008                 }
2009         }
2010         intr = hw_test_and_clear_intr_active(ci);
2011
2012         if (intr) {
2013                 /* order defines priority - do NOT change it */
2014                 if (USBi_URI & intr)
2015                         isr_reset_handler(ci);
2016
2017                 if (USBi_PCI & intr) {
2018                         ci->gadget.speed = hw_port_is_high_speed(ci) ?
2019                                 USB_SPEED_HIGH : USB_SPEED_FULL;
2020                         if (ci->suspended) {
2021                                 if (ci->driver->resume) {
2022                                         spin_unlock(&ci->lock);
2023                                         ci->driver->resume(&ci->gadget);
2024                                         spin_lock(&ci->lock);
2025                                 }
2026                                 ci->suspended = 0;
2027                                 usb_gadget_set_state(&ci->gadget,
2028                                                 ci->resume_state);
2029                         }
2030                 }
2031
2032                 if (USBi_UI  & intr)
2033                         isr_tr_complete_handler(ci);
2034
2035                 if ((USBi_SLI & intr) && !(ci->suspended)) {
2036                         ci->suspended = 1;
2037                         ci->resume_state = ci->gadget.state;
2038                         if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
2039                             ci->driver->suspend) {
2040                                 spin_unlock(&ci->lock);
2041                                 ci->driver->suspend(&ci->gadget);
2042                                 spin_lock(&ci->lock);
2043                         }
2044                         usb_gadget_set_state(&ci->gadget,
2045                                         USB_STATE_SUSPENDED);
2046                 }
2047                 retval = IRQ_HANDLED;
2048         } else {
2049                 retval = IRQ_NONE;
2050         }
2051         spin_unlock(&ci->lock);
2052
2053         return retval;
2054 }
2055
2056 /**
2057  * udc_start: initialize gadget role
2058  * @ci: chipidea controller
2059  */
2060 static int udc_start(struct ci_hdrc *ci)
2061 {
2062         struct device *dev = ci->dev;
2063         struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
2064         int retval = 0;
2065
2066         ci->gadget.ops          = &usb_gadget_ops;
2067         ci->gadget.speed        = USB_SPEED_UNKNOWN;
2068         ci->gadget.max_speed    = USB_SPEED_HIGH;
2069         ci->gadget.name         = ci->platdata->name;
2070         ci->gadget.otg_caps     = otg_caps;
2071         ci->gadget.sg_supported = 1;
2072         ci->gadget.irq          = ci->irq;
2073
2074         if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA)
2075                 ci->gadget.quirk_avoids_skb_reserve = 1;
2076
2077         if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
2078                                                 otg_caps->adp_support))
2079                 ci->gadget.is_otg = 1;
2080
2081         INIT_LIST_HEAD(&ci->gadget.ep_list);
2082
2083         /* alloc resources */
2084         ci->qh_pool = dma_pool_create("ci_hw_qh", dev->parent,
2085                                        sizeof(struct ci_hw_qh),
2086                                        64, CI_HDRC_PAGE_SIZE);
2087         if (ci->qh_pool == NULL)
2088                 return -ENOMEM;
2089
2090         ci->td_pool = dma_pool_create("ci_hw_td", dev->parent,
2091                                        sizeof(struct ci_hw_td),
2092                                        64, CI_HDRC_PAGE_SIZE);
2093         if (ci->td_pool == NULL) {
2094                 retval = -ENOMEM;
2095                 goto free_qh_pool;
2096         }
2097
2098         retval = init_eps(ci);
2099         if (retval)
2100                 goto free_pools;
2101
2102         ci->gadget.ep0 = &ci->ep0in->ep;
2103
2104         retval = usb_add_gadget_udc(dev, &ci->gadget);
2105         if (retval)
2106                 goto destroy_eps;
2107
2108         return retval;
2109
2110 destroy_eps:
2111         destroy_eps(ci);
2112 free_pools:
2113         dma_pool_destroy(ci->td_pool);
2114 free_qh_pool:
2115         dma_pool_destroy(ci->qh_pool);
2116         return retval;
2117 }
2118
2119 /*
2120  * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
2121  *
2122  * No interrupts active, the IRQ has been released
2123  */
2124 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
2125 {
2126         if (!ci->roles[CI_ROLE_GADGET])
2127                 return;
2128
2129         usb_del_gadget_udc(&ci->gadget);
2130
2131         destroy_eps(ci);
2132
2133         dma_pool_destroy(ci->td_pool);
2134         dma_pool_destroy(ci->qh_pool);
2135 }
2136
2137 static int udc_id_switch_for_device(struct ci_hdrc *ci)
2138 {
2139         if (ci->platdata->pins_device)
2140                 pinctrl_select_state(ci->platdata->pctl,
2141                                      ci->platdata->pins_device);
2142
2143         if (ci->is_otg)
2144                 /* Clear and enable BSV irq */
2145                 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
2146                                         OTGSC_BSVIS | OTGSC_BSVIE);
2147
2148         return 0;
2149 }
2150
2151 static void udc_id_switch_for_host(struct ci_hdrc *ci)
2152 {
2153         /*
2154          * host doesn't care B_SESSION_VALID event
2155          * so clear and disbale BSV irq
2156          */
2157         if (ci->is_otg)
2158                 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
2159
2160         ci->vbus_active = 0;
2161
2162         if (ci->platdata->pins_device && ci->platdata->pins_default)
2163                 pinctrl_select_state(ci->platdata->pctl,
2164                                      ci->platdata->pins_default);
2165 }
2166
2167 /**
2168  * ci_hdrc_gadget_init - initialize device related bits
2169  * @ci: the controller
2170  *
2171  * This function initializes the gadget, if the device is "device capable".
2172  */
2173 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
2174 {
2175         struct ci_role_driver *rdrv;
2176         int ret;
2177
2178         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
2179                 return -ENXIO;
2180
2181         rdrv = devm_kzalloc(ci->dev, sizeof(*rdrv), GFP_KERNEL);
2182         if (!rdrv)
2183                 return -ENOMEM;
2184
2185         rdrv->start     = udc_id_switch_for_device;
2186         rdrv->stop      = udc_id_switch_for_host;
2187         rdrv->irq       = udc_irq;
2188         rdrv->name      = "gadget";
2189
2190         ret = udc_start(ci);
2191         if (!ret)
2192                 ci->roles[CI_ROLE_GADGET] = rdrv;
2193
2194         return ret;
2195 }