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);
  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                             ci->rev == CI_REVISION_22)
 693                                 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
 694                                         reprime_dtd(ci, hwep, node);
 695                         hwreq->req.status = -EALREADY;
 696                         return -EBUSY;
 697                 }
 698
 699                 remaining_length = (tmptoken & TD_TOTAL_BYTES);
 700                 remaining_length >>= __ffs(TD_TOTAL_BYTES);
 701                 actual -= remaining_length;
 702
 703                 hwreq->req.status = tmptoken & TD_STATUS;
 704                 if ((TD_STATUS_HALTED & hwreq->req.status)) {
 705                         hwreq->req.status = -EPIPE;
 706                         break;
 707                 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
 708                         hwreq->req.status = -EPROTO;
 709                         break;
 710                 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
 711                         hwreq->req.status = -EILSEQ;
 712                         break;
 713                 }
 714
 715                 if (remaining_length) {
 716                         if (hwep->dir == TX) {
 717                                 hwreq->req.status = -EPROTO;
 718                                 break;
 719                         }
 720                 }
 721                 /*
 722                  * As the hardware could still address the freed td
 723                  * which will run the udc unusable, the cleanup of the
 724                  * td has to be delayed by one.
 725                  */
 726                 if (hwep->pending_td)
 727                         free_pending_td(hwep);
 728
 729                 hwep->pending_td = node;
 730                 list_del_init(&node->td);
 731         }
 732
 733         usb_gadget_unmap_request_by_dev(hwep->ci->dev->parent,
 734                                         &hwreq->req, hwep->dir);
 735
 736         hwreq->req.actual += actual;
 737
 738         if (hwreq->req.status)
 739                 return hwreq->req.status;
 740
 741         return hwreq->req.actual;
 742 }
 743
 744 /**
 745  * _ep_nuke: dequeues all endpoint requests
 746  * @hwep: endpoint
 747  *
 748  * This function returns an error code
 749  * Caller must hold lock
 750  */
 751 static int _ep_nuke(struct ci_hw_ep *hwep)
 752 __releases(hwep->lock)
 753 __acquires(hwep->lock)
 754 {
 755         struct td_node *node, *tmpnode;
 756         if (hwep == NULL)
 757                 return -EINVAL;
 758
 759         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
 760
 761         while (!list_empty(&hwep->qh.queue)) {
 762
 763                 /* pop oldest request */
 764                 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
 765                                                      struct ci_hw_req, queue);
 766
 767                 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 768                         dma_pool_free(hwep->td_pool, node->ptr, node->dma);
 769                         list_del_init(&node->td);
 770                         node->ptr = NULL;
 771                         kfree(node);
 772                 }
 773
 774                 list_del_init(&hwreq->queue);
 775                 hwreq->req.status = -ESHUTDOWN;
 776
 777                 if (hwreq->req.complete != NULL) {
 778                         spin_unlock(hwep->lock);
 779                         usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
 780                         spin_lock(hwep->lock);
 781                 }
 782         }
 783
 784         if (hwep->pending_td)
 785                 free_pending_td(hwep);
 786
 787         return 0;
 788 }
 789
 790 static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
 791 {
 792         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
 793         int direction, retval = 0;
 794         unsigned long flags;
 795
 796         if (ep == NULL || hwep->ep.desc == NULL)
 797                 return -EINVAL;
 798
 799         if (usb_endpoint_xfer_isoc(hwep->ep.desc))
 800                 return -EOPNOTSUPP;
 801
 802         spin_lock_irqsave(hwep->lock, flags);
 803
 804         if (value && hwep->dir == TX && check_transfer &&
 805                 !list_empty(&hwep->qh.queue) &&
 806                         !usb_endpoint_xfer_control(hwep->ep.desc)) {
 807                 spin_unlock_irqrestore(hwep->lock, flags);
 808                 return -EAGAIN;
 809         }
 810
 811         direction = hwep->dir;
 812         do {
 813                 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
 814
 815                 if (!value)
 816                         hwep->wedge = 0;
 817
 818                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
 819                         hwep->dir = (hwep->dir == TX) ? RX : TX;
 820
 821         } while (hwep->dir != direction);
 822
 823         spin_unlock_irqrestore(hwep->lock, flags);
 824         return retval;
 825 }
 826
 827
 828 /**
 829  * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
 830  * @gadget: gadget
 831  *
 832  * This function returns an error code
 833  */
 834 static int _gadget_stop_activity(struct usb_gadget *gadget)
 835 {
 836         struct usb_ep *ep;
 837         struct ci_hdrc    *ci = container_of(gadget, struct ci_hdrc, gadget);
 838         unsigned long flags;
 839
 840         /* flush all endpoints */
 841         gadget_for_each_ep(ep, gadget) {
 842                 usb_ep_fifo_flush(ep);
 843         }
 844         usb_ep_fifo_flush(&ci->ep0out->ep);
 845         usb_ep_fifo_flush(&ci->ep0in->ep);
 846
 847         /* make sure to disable all endpoints */
 848         gadget_for_each_ep(ep, gadget) {
 849                 usb_ep_disable(ep);
 850         }
 851
 852         if (ci->status != NULL) {
 853                 usb_ep_free_request(&ci->ep0in->ep, ci->status);
 854                 ci->status = NULL;
 855         }
 856
 857         spin_lock_irqsave(&ci->lock, flags);
 858         ci->gadget.speed = USB_SPEED_UNKNOWN;
 859         ci->remote_wakeup = 0;
 860         ci->suspended = 0;
 861         spin_unlock_irqrestore(&ci->lock, flags);
 862
 863         return 0;
 864 }
 865
 866 /******************************************************************************
 867  * ISR block
 868  *****************************************************************************/
 869 /**
 870  * isr_reset_handler: USB reset interrupt handler
 871  * @ci: UDC device
 872  *
 873  * This function resets USB engine after a bus reset occurred
 874  */
 875 static void isr_reset_handler(struct ci_hdrc *ci)
 876 __releases(ci->lock)
 877 __acquires(ci->lock)
 878 {
 879         int retval;
 880         u32 intr;
 881
 882         spin_unlock(&ci->lock);
 883         if (ci->gadget.speed != USB_SPEED_UNKNOWN)
 884                 usb_gadget_udc_reset(&ci->gadget, ci->driver);
 885
 886         retval = _gadget_stop_activity(&ci->gadget);
 887         if (retval)
 888                 goto done;
 889
 890         retval = hw_usb_reset(ci);
 891         if (retval)
 892                 goto done;
 893
 894         /* clear SLI */
 895         hw_write(ci, OP_USBSTS, USBi_SLI, USBi_SLI);
 896         intr = hw_read(ci, OP_USBINTR, ~0);
 897         hw_write(ci, OP_USBINTR, ~0, intr | USBi_SLI);
 898
 899         ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
 900         if (ci->status == NULL)
 901                 retval = -ENOMEM;
 902
 903 done:
 904         spin_lock(&ci->lock);
 905
 906         if (retval)
 907                 dev_err(ci->dev, "error: %i\n", retval);
 908 }
 909
 910 /**
 911  * isr_get_status_complete: get_status request complete function
 912  * @ep:  endpoint
 913  * @req: request handled
 914  *
 915  * Caller must release lock
 916  */
 917 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
 918 {
 919         if (ep == NULL || req == NULL)
 920                 return;
 921
 922         kfree(req->buf);
 923         usb_ep_free_request(ep, req);
 924 }
 925
 926 /**
 927  * _ep_queue: queues (submits) an I/O request to an endpoint
 928  * @ep:        endpoint
 929  * @req:       request
 930  * @gfp_flags: GFP flags (not used)
 931  *
 932  * Caller must hold lock
 933  * This function returns an error code
 934  */
 935 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
 936                     gfp_t __maybe_unused gfp_flags)
 937 {
 938         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
 939         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
 940         struct ci_hdrc *ci = hwep->ci;
 941         int retval = 0;
 942
 943         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
 944                 return -EINVAL;
 945
 946         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
 947                 if (req->length)
 948                         hwep = (ci->ep0_dir == RX) ?
 949                                ci->ep0out : ci->ep0in;
 950                 if (!list_empty(&hwep->qh.queue)) {
 951                         _ep_nuke(hwep);
 952                         dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
 953                                  _usb_addr(hwep));
 954                 }
 955         }
 956
 957         if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
 958             hwreq->req.length > hwep->ep.mult * hwep->ep.maxpacket) {
 959                 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
 960                 return -EMSGSIZE;
 961         }
 962
 963         /* first nuke then test link, e.g. previous status has not sent */
 964         if (!list_empty(&hwreq->queue)) {
 965                 dev_err(hwep->ci->dev, "request already in queue\n");
 966                 return -EBUSY;
 967         }
 968
 969         /* push request */
 970         hwreq->req.status = -EINPROGRESS;
 971         hwreq->req.actual = 0;
 972
 973         retval = _hardware_enqueue(hwep, hwreq);
 974
 975         if (retval == -EALREADY)
 976                 retval = 0;
 977         if (!retval)
 978                 list_add_tail(&hwreq->queue, &hwep->qh.queue);
 979
 980         return retval;
 981 }
 982
 983 /**
 984  * isr_get_status_response: get_status request response
 985  * @ci: ci struct
 986  * @setup: setup request packet
 987  *
 988  * This function returns an error code
 989  */
 990 static int isr_get_status_response(struct ci_hdrc *ci,
 991                                    struct usb_ctrlrequest *setup)
 992 __releases(hwep->lock)
 993 __acquires(hwep->lock)
 994 {
 995         struct ci_hw_ep *hwep = ci->ep0in;
 996         struct usb_request *req = NULL;
 997         gfp_t gfp_flags = GFP_ATOMIC;
 998         int dir, num, retval;
 999
1000         if (hwep == NULL || setup == NULL)
1001                 return -EINVAL;
1002
1003         spin_unlock(hwep->lock);
1004         req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
1005         spin_lock(hwep->lock);
1006         if (req == NULL)
1007                 return -ENOMEM;
1008
1009         req->complete = isr_get_status_complete;
1010         req->length   = 2;
1011         req->buf      = kzalloc(req->length, gfp_flags);
1012         if (req->buf == NULL) {
1013                 retval = -ENOMEM;
1014                 goto err_free_req;
1015         }
1016
1017         if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
1018                 *(u16 *)req->buf = (ci->remote_wakeup << 1) |
1019                         ci->gadget.is_selfpowered;
1020         } else if ((setup->bRequestType & USB_RECIP_MASK) \
1021                    == USB_RECIP_ENDPOINT) {
1022                 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
1023                         TX : RX;
1024                 num =  le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
1025                 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
1026         }
1027         /* else do nothing; reserved for future use */
1028
1029         retval = _ep_queue(&hwep->ep, req, gfp_flags);
1030         if (retval)
1031                 goto err_free_buf;
1032
1033         return 0;
1034
1035  err_free_buf:
1036         kfree(req->buf);
1037  err_free_req:
1038         spin_unlock(hwep->lock);
1039         usb_ep_free_request(&hwep->ep, req);
1040         spin_lock(hwep->lock);
1041         return retval;
1042 }
1043
1044 /**
1045  * isr_setup_status_complete: setup_status request complete function
1046  * @ep:  endpoint
1047  * @req: request handled
1048  *
1049  * Caller must release lock. Put the port in test mode if test mode
1050  * feature is selected.
1051  */
1052 static void
1053 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
1054 {
1055         struct ci_hdrc *ci = req->context;
1056         unsigned long flags;
1057
1058         if (req->status < 0)
1059                 return;
1060
1061         if (ci->setaddr) {
1062                 hw_usb_set_address(ci, ci->address);
1063                 ci->setaddr = false;
1064                 if (ci->address)
1065                         usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
1066         }
1067
1068         spin_lock_irqsave(&ci->lock, flags);
1069         if (ci->test_mode)
1070                 hw_port_test_set(ci, ci->test_mode);
1071         spin_unlock_irqrestore(&ci->lock, flags);
1072 }
1073
1074 /**
1075  * isr_setup_status_phase: queues the status phase of a setup transation
1076  * @ci: ci struct
1077  *
1078  * This function returns an error code
1079  */
1080 static int isr_setup_status_phase(struct ci_hdrc *ci)
1081 {
1082         struct ci_hw_ep *hwep;
1083
1084         /*
1085          * Unexpected USB controller behavior, caused by bad signal integrity
1086          * or ground reference problems, can lead to isr_setup_status_phase
1087          * being called with ci->status equal to NULL.
1088          * If this situation occurs, you should review your USB hardware design.
1089          */
1090         if (WARN_ON_ONCE(!ci->status))
1091                 return -EPIPE;
1092
1093         hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
1094         ci->status->context = ci;
1095         ci->status->complete = isr_setup_status_complete;
1096
1097         return _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
1098 }
1099
1100 /**
1101  * isr_tr_complete_low: transaction complete low level handler
1102  * @hwep: endpoint
1103  *
1104  * This function returns an error code
1105  * Caller must hold lock
1106  */
1107 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
1108 __releases(hwep->lock)
1109 __acquires(hwep->lock)
1110 {
1111         struct ci_hw_req *hwreq, *hwreqtemp;
1112         struct ci_hw_ep *hweptemp = hwep;
1113         int retval = 0;
1114
1115         list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
1116                         queue) {
1117                 retval = _hardware_dequeue(hwep, hwreq);
1118                 if (retval < 0)
1119                         break;
1120                 list_del_init(&hwreq->queue);
1121                 if (hwreq->req.complete != NULL) {
1122                         spin_unlock(hwep->lock);
1123                         if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
1124                                         hwreq->req.length)
1125                                 hweptemp = hwep->ci->ep0in;
1126                         usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
1127                         spin_lock(hwep->lock);
1128                 }
1129         }
1130
1131         if (retval == -EBUSY)
1132                 retval = 0;
1133
1134         return retval;
1135 }
1136
1137 static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
1138 {
1139         dev_warn(&ci->gadget.dev,
1140                 "connect the device to an alternate port if you want HNP\n");
1141         return isr_setup_status_phase(ci);
1142 }
1143
1144 /**
1145  * isr_setup_packet_handler: setup packet handler
1146  * @ci: UDC descriptor
1147  *
1148  * This function handles setup packet
1149  */
1150 static void isr_setup_packet_handler(struct ci_hdrc *ci)
1151 __releases(ci->lock)
1152 __acquires(ci->lock)
1153 {
1154         struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1155         struct usb_ctrlrequest req;
1156         int type, num, dir, err = -EINVAL;
1157         u8 tmode = 0;
1158
1159         /*
1160          * Flush data and handshake transactions of previous
1161          * setup packet.
1162          */
1163         _ep_nuke(ci->ep0out);
1164         _ep_nuke(ci->ep0in);
1165
1166         /* read_setup_packet */
1167         do {
1168                 hw_test_and_set_setup_guard(ci);
1169                 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1170         } while (!hw_test_and_clear_setup_guard(ci));
1171
1172         type = req.bRequestType;
1173
1174         ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1175
1176         switch (req.bRequest) {
1177         case USB_REQ_CLEAR_FEATURE:
1178                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1179                                 le16_to_cpu(req.wValue) ==
1180                                 USB_ENDPOINT_HALT) {
1181                         if (req.wLength != 0)
1182                                 break;
1183                         num  = le16_to_cpu(req.wIndex);
1184                         dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1185                         num &= USB_ENDPOINT_NUMBER_MASK;
1186                         if (dir == TX)
1187                                 num += ci->hw_ep_max / 2;
1188                         if (!ci->ci_hw_ep[num].wedge) {
1189                                 spin_unlock(&ci->lock);
1190                                 err = usb_ep_clear_halt(
1191                                         &ci->ci_hw_ep[num].ep);
1192                                 spin_lock(&ci->lock);
1193                                 if (err)
1194                                         break;
1195                         }
1196                         err = isr_setup_status_phase(ci);
1197                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1198                                 le16_to_cpu(req.wValue) ==
1199                                 USB_DEVICE_REMOTE_WAKEUP) {
1200                         if (req.wLength != 0)
1201                                 break;
1202                         ci->remote_wakeup = 0;
1203                         err = isr_setup_status_phase(ci);
1204                 } else {
1205                         goto delegate;
1206                 }
1207                 break;
1208         case USB_REQ_GET_STATUS:
1209                 if ((type != (USB_DIR_IN|USB_RECIP_DEVICE) ||
1210                         le16_to_cpu(req.wIndex) == OTG_STS_SELECTOR) &&
1211                     type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1212                     type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1213                         goto delegate;
1214                 if (le16_to_cpu(req.wLength) != 2 ||
1215                     le16_to_cpu(req.wValue)  != 0)
1216                         break;
1217                 err = isr_get_status_response(ci, &req);
1218                 break;
1219         case USB_REQ_SET_ADDRESS:
1220                 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1221                         goto delegate;
1222                 if (le16_to_cpu(req.wLength) != 0 ||
1223                     le16_to_cpu(req.wIndex)  != 0)
1224                         break;
1225                 ci->address = (u8)le16_to_cpu(req.wValue);
1226                 ci->setaddr = true;
1227                 err = isr_setup_status_phase(ci);
1228                 break;
1229         case USB_REQ_SET_FEATURE:
1230                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1231                                 le16_to_cpu(req.wValue) ==
1232                                 USB_ENDPOINT_HALT) {
1233                         if (req.wLength != 0)
1234                                 break;
1235                         num  = le16_to_cpu(req.wIndex);
1236                         dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1237                         num &= USB_ENDPOINT_NUMBER_MASK;
1238                         if (dir == TX)
1239                                 num += ci->hw_ep_max / 2;
1240
1241                         spin_unlock(&ci->lock);
1242                         err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1243                         spin_lock(&ci->lock);
1244                         if (!err)
1245                                 isr_setup_status_phase(ci);
1246                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1247                         if (req.wLength != 0)
1248                                 break;
1249                         switch (le16_to_cpu(req.wValue)) {
1250                         case USB_DEVICE_REMOTE_WAKEUP:
1251                                 ci->remote_wakeup = 1;
1252                                 err = isr_setup_status_phase(ci);
1253                                 break;
1254                         case USB_DEVICE_TEST_MODE:
1255                                 tmode = le16_to_cpu(req.wIndex) >> 8;
1256                                 switch (tmode) {
1257                                 case USB_TEST_J:
1258                                 case USB_TEST_K:
1259                                 case USB_TEST_SE0_NAK:
1260                                 case USB_TEST_PACKET:
1261                                 case USB_TEST_FORCE_ENABLE:
1262                                         ci->test_mode = tmode;
1263                                         err = isr_setup_status_phase(
1264                                                         ci);
1265                                         break;
1266                                 default:
1267                                         break;
1268                                 }
1269                                 break;
1270                         case USB_DEVICE_B_HNP_ENABLE:
1271                                 if (ci_otg_is_fsm_mode(ci)) {
1272                                         ci->gadget.b_hnp_enable = 1;
1273                                         err = isr_setup_status_phase(
1274                                                         ci);
1275                                 }
1276                                 break;
1277                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1278                                 if (ci_otg_is_fsm_mode(ci))
1279                                         err = otg_a_alt_hnp_support(ci);
1280                                 break;
1281                         case USB_DEVICE_A_HNP_SUPPORT:
1282                                 if (ci_otg_is_fsm_mode(ci)) {
1283                                         ci->gadget.a_hnp_support = 1;
1284                                         err = isr_setup_status_phase(
1285                                                         ci);
1286                                 }
1287                                 break;
1288                         default:
1289                                 goto delegate;
1290                         }
1291                 } else {
1292                         goto delegate;
1293                 }
1294                 break;
1295         default:
1296 delegate:
1297                 if (req.wLength == 0)   /* no data phase */
1298                         ci->ep0_dir = TX;
1299
1300                 spin_unlock(&ci->lock);
1301                 err = ci->driver->setup(&ci->gadget, &req);
1302                 spin_lock(&ci->lock);
1303                 break;
1304         }
1305
1306         if (err < 0) {
1307                 spin_unlock(&ci->lock);
1308                 if (_ep_set_halt(&hwep->ep, 1, false))
1309                         dev_err(ci->dev, "error: _ep_set_halt\n");
1310                 spin_lock(&ci->lock);
1311         }
1312 }
1313
1314 /**
1315  * isr_tr_complete_handler: transaction complete interrupt handler
1316  * @ci: UDC descriptor
1317  *
1318  * This function handles traffic events
1319  */
1320 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1321 __releases(ci->lock)
1322 __acquires(ci->lock)
1323 {
1324         unsigned i;
1325         int err;
1326
1327         for (i = 0; i < ci->hw_ep_max; i++) {
1328                 struct ci_hw_ep *hwep  = &ci->ci_hw_ep[i];
1329
1330                 if (hwep->ep.desc == NULL)
1331                         continue;   /* not configured */
1332
1333                 if (hw_test_and_clear_complete(ci, i)) {
1334                         err = isr_tr_complete_low(hwep);
1335                         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1336                                 if (err > 0)   /* needs status phase */
1337                                         err = isr_setup_status_phase(ci);
1338                                 if (err < 0) {
1339                                         spin_unlock(&ci->lock);
1340                                         if (_ep_set_halt(&hwep->ep, 1, false))
1341                                                 dev_err(ci->dev,
1342                                                 "error: _ep_set_halt\n");
1343                                         spin_lock(&ci->lock);
1344                                 }
1345                         }
1346                 }
1347
1348                 /* Only handle setup packet below */
1349                 if (i == 0 &&
1350                         hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1351                         isr_setup_packet_handler(ci);
1352         }
1353 }
1354
1355 /******************************************************************************
1356  * ENDPT block
1357  *****************************************************************************/
1358 /*
1359  * ep_enable: configure endpoint, making it usable
1360  *
1361  * Check usb_ep_enable() at "usb_gadget.h" for details
1362  */
1363 static int ep_enable(struct usb_ep *ep,
1364                      const struct usb_endpoint_descriptor *desc)
1365 {
1366         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1367         int retval = 0;
1368         unsigned long flags;
1369         u32 cap = 0;
1370
1371         if (ep == NULL || desc == NULL)
1372                 return -EINVAL;
1373
1374         spin_lock_irqsave(hwep->lock, flags);
1375
1376         /* only internal SW should enable ctrl endpts */
1377
1378         if (!list_empty(&hwep->qh.queue)) {
1379                 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1380                 spin_unlock_irqrestore(hwep->lock, flags);
1381                 return -EBUSY;
1382         }
1383
1384         hwep->ep.desc = desc;
1385
1386         hwep->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
1387         hwep->num  = usb_endpoint_num(desc);
1388         hwep->type = usb_endpoint_type(desc);
1389
1390         hwep->ep.maxpacket = usb_endpoint_maxp(desc);
1391         hwep->ep.mult = usb_endpoint_maxp_mult(desc);
1392
1393         if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1394                 cap |= QH_IOS;
1395
1396         cap |= QH_ZLT;
1397         cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1398         /*
1399          * For ISO-TX, we set mult at QH as the largest value, and use
1400          * MultO at TD as real mult value.
1401          */
1402         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1403                 cap |= 3 << __ffs(QH_MULT);
1404
1405         hwep->qh.ptr->cap = cpu_to_le32(cap);
1406
1407         hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE);   /* needed? */
1408
1409         if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1410                 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1411                 retval = -EINVAL;
1412         }
1413
1414         /*
1415          * Enable endpoints in the HW other than ep0 as ep0
1416          * is always enabled
1417          */
1418         if (hwep->num)
1419                 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1420                                        hwep->type);
1421
1422         spin_unlock_irqrestore(hwep->lock, flags);
1423         return retval;
1424 }
1425
1426 /*
1427  * ep_disable: endpoint is no longer usable
1428  *
1429  * Check usb_ep_disable() at "usb_gadget.h" for details
1430  */
1431 static int ep_disable(struct usb_ep *ep)
1432 {
1433         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1434         int direction, retval = 0;
1435         unsigned long flags;
1436
1437         if (ep == NULL)
1438                 return -EINVAL;
1439         else if (hwep->ep.desc == NULL)
1440                 return -EBUSY;
1441
1442         spin_lock_irqsave(hwep->lock, flags);
1443         if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1444                 spin_unlock_irqrestore(hwep->lock, flags);
1445                 return 0;
1446         }
1447
1448         /* only internal SW should disable ctrl endpts */
1449
1450         direction = hwep->dir;
1451         do {
1452                 retval |= _ep_nuke(hwep);
1453                 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1454
1455                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1456                         hwep->dir = (hwep->dir == TX) ? RX : TX;
1457
1458         } while (hwep->dir != direction);
1459
1460         hwep->ep.desc = NULL;
1461
1462         spin_unlock_irqrestore(hwep->lock, flags);
1463         return retval;
1464 }
1465
1466 /*
1467  * ep_alloc_request: allocate a request object to use with this endpoint
1468  *
1469  * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1470  */
1471 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1472 {
1473         struct ci_hw_req *hwreq;
1474
1475         if (ep == NULL)
1476                 return NULL;
1477
1478         hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1479         if (hwreq != NULL) {
1480                 INIT_LIST_HEAD(&hwreq->queue);
1481                 INIT_LIST_HEAD(&hwreq->tds);
1482         }
1483
1484         return (hwreq == NULL) ? NULL : &hwreq->req;
1485 }
1486
1487 /*
1488  * ep_free_request: frees a request object
1489  *
1490  * Check usb_ep_free_request() at "usb_gadget.h" for details
1491  */
1492 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1493 {
1494         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1495         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1496         struct td_node *node, *tmpnode;
1497         unsigned long flags;
1498
1499         if (ep == NULL || req == NULL) {
1500                 return;
1501         } else if (!list_empty(&hwreq->queue)) {
1502                 dev_err(hwep->ci->dev, "freeing queued request\n");
1503                 return;
1504         }
1505
1506         spin_lock_irqsave(hwep->lock, flags);
1507
1508         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1509                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1510                 list_del_init(&node->td);
1511                 node->ptr = NULL;
1512                 kfree(node);
1513         }
1514
1515         kfree(hwreq);
1516
1517         spin_unlock_irqrestore(hwep->lock, flags);
1518 }
1519
1520 /*
1521  * ep_queue: queues (submits) an I/O request to an endpoint
1522  *
1523  * Check usb_ep_queue()* at usb_gadget.h" for details
1524  */
1525 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1526                     gfp_t __maybe_unused gfp_flags)
1527 {
1528         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1529         int retval = 0;
1530         unsigned long flags;
1531
1532         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1533                 return -EINVAL;
1534
1535         spin_lock_irqsave(hwep->lock, flags);
1536         if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1537                 spin_unlock_irqrestore(hwep->lock, flags);
1538                 return 0;
1539         }
1540         retval = _ep_queue(ep, req, gfp_flags);
1541         spin_unlock_irqrestore(hwep->lock, flags);
1542         return retval;
1543 }
1544
1545 /*
1546  * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1547  *
1548  * Check usb_ep_dequeue() at "usb_gadget.h" for details
1549  */
1550 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1551 {
1552         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1553         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1554         unsigned long flags;
1555         struct td_node *node, *tmpnode;
1556
1557         if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1558                 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1559                 list_empty(&hwep->qh.queue))
1560                 return -EINVAL;
1561
1562         spin_lock_irqsave(hwep->lock, flags);
1563         if (hwep->ci->gadget.speed != USB_SPEED_UNKNOWN)
1564                 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1565
1566         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1567                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1568                 list_del(&node->td);
1569                 kfree(node);
1570         }
1571
1572         /* pop request */
1573         list_del_init(&hwreq->queue);
1574
1575         usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1576
1577         req->status = -ECONNRESET;
1578
1579         if (hwreq->req.complete != NULL) {
1580                 spin_unlock(hwep->lock);
1581                 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1582                 spin_lock(hwep->lock);
1583         }
1584
1585         spin_unlock_irqrestore(hwep->lock, flags);
1586         return 0;
1587 }
1588
1589 /*
1590  * ep_set_halt: sets the endpoint halt feature
1591  *
1592  * Check usb_ep_set_halt() at "usb_gadget.h" for details
1593  */
1594 static int ep_set_halt(struct usb_ep *ep, int value)
1595 {
1596         return _ep_set_halt(ep, value, true);
1597 }
1598
1599 /*
1600  * ep_set_wedge: sets the halt feature and ignores clear requests
1601  *
1602  * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1603  */
1604 static int ep_set_wedge(struct usb_ep *ep)
1605 {
1606         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1607         unsigned long flags;
1608
1609         if (ep == NULL || hwep->ep.desc == NULL)
1610                 return -EINVAL;
1611
1612         spin_lock_irqsave(hwep->lock, flags);
1613         hwep->wedge = 1;
1614         spin_unlock_irqrestore(hwep->lock, flags);
1615
1616         return usb_ep_set_halt(ep);
1617 }
1618
1619 /*
1620  * ep_fifo_flush: flushes contents of a fifo
1621  *
1622  * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1623  */
1624 static void ep_fifo_flush(struct usb_ep *ep)
1625 {
1626         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1627         unsigned long flags;
1628
1629         if (ep == NULL) {
1630                 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1631                 return;
1632         }
1633
1634         spin_lock_irqsave(hwep->lock, flags);
1635         if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1636                 spin_unlock_irqrestore(hwep->lock, flags);
1637                 return;
1638         }
1639
1640         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1641
1642         spin_unlock_irqrestore(hwep->lock, flags);
1643 }
1644
1645 /*
1646  * Endpoint-specific part of the API to the USB controller hardware
1647  * Check "usb_gadget.h" for details
1648  */
1649 static const struct usb_ep_ops usb_ep_ops = {
1650         .enable        = ep_enable,
1651         .disable       = ep_disable,
1652         .alloc_request = ep_alloc_request,
1653         .free_request  = ep_free_request,
1654         .queue         = ep_queue,
1655         .dequeue       = ep_dequeue,
1656         .set_halt      = ep_set_halt,
1657         .set_wedge     = ep_set_wedge,
1658         .fifo_flush    = ep_fifo_flush,
1659 };
1660
1661 /******************************************************************************
1662  * GADGET block
1663  *****************************************************************************/
1664
1665 static int ci_udc_get_frame(struct usb_gadget *_gadget)
1666 {
1667         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1668         unsigned long flags;
1669         int ret;
1670
1671         spin_lock_irqsave(&ci->lock, flags);
1672         ret = hw_read(ci, OP_FRINDEX, 0x3fff);
1673         spin_unlock_irqrestore(&ci->lock, flags);
1674         return ret >> 3;
1675 }
1676
1677 /*
1678  * ci_hdrc_gadget_connect: caller makes sure gadget driver is binded
1679  */
1680 static void ci_hdrc_gadget_connect(struct usb_gadget *_gadget, int is_active)
1681 {
1682         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1683
1684         if (is_active) {
1685                 pm_runtime_get_sync(ci->dev);
1686                 hw_device_reset(ci);
1687                 spin_lock_irq(&ci->lock);
1688                 if (ci->driver) {
1689                         hw_device_state(ci, ci->ep0out->qh.dma);
1690                         usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1691                         spin_unlock_irq(&ci->lock);
1692                         usb_udc_vbus_handler(_gadget, true);
1693                 } else {
1694                         spin_unlock_irq(&ci->lock);
1695                 }
1696         } else {
1697                 usb_udc_vbus_handler(_gadget, false);
1698                 if (ci->driver)
1699                         ci->driver->disconnect(&ci->gadget);
1700                 hw_device_state(ci, 0);
1701                 if (ci->platdata->notify_event)
1702                         ci->platdata->notify_event(ci,
1703                         CI_HDRC_CONTROLLER_STOPPED_EVENT);
1704                 _gadget_stop_activity(&ci->gadget);
1705                 pm_runtime_put_sync(ci->dev);
1706                 usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1707         }
1708 }
1709
1710 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1711 {
1712         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1713         unsigned long flags;
1714         int ret = 0;
1715
1716         spin_lock_irqsave(&ci->lock, flags);
1717         ci->vbus_active = is_active;
1718         spin_unlock_irqrestore(&ci->lock, flags);
1719
1720         if (ci->usb_phy)
1721                 usb_phy_set_charger_state(ci->usb_phy, is_active ?
1722                         USB_CHARGER_PRESENT : USB_CHARGER_ABSENT);
1723
1724         if (ci->platdata->notify_event)
1725                 ret = ci->platdata->notify_event(ci,
1726                                 CI_HDRC_CONTROLLER_VBUS_EVENT);
1727
1728         if (ci->usb_phy) {
1729                 if (is_active)
1730                         usb_phy_set_event(ci->usb_phy, USB_EVENT_VBUS);
1731                 else
1732                         usb_phy_set_event(ci->usb_phy, USB_EVENT_NONE);
1733         }
1734
1735         if (ci->driver)
1736                 ci_hdrc_gadget_connect(_gadget, is_active);
1737
1738         return ret;
1739 }
1740
1741 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1742 {
1743         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1744         unsigned long flags;
1745         int ret = 0;
1746
1747         spin_lock_irqsave(&ci->lock, flags);
1748         if (ci->gadget.speed == USB_SPEED_UNKNOWN) {
1749                 spin_unlock_irqrestore(&ci->lock, flags);
1750                 return 0;
1751         }
1752         if (!ci->remote_wakeup) {
1753                 ret = -EOPNOTSUPP;
1754                 goto out;
1755         }
1756         if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1757                 ret = -EINVAL;
1758                 goto out;
1759         }
1760         hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1761 out:
1762         spin_unlock_irqrestore(&ci->lock, flags);
1763         return ret;
1764 }
1765
1766 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1767 {
1768         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1769
1770         if (ci->usb_phy)
1771                 return usb_phy_set_power(ci->usb_phy, ma);
1772         return -ENOTSUPP;
1773 }
1774
1775 static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1776 {
1777         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1778         struct ci_hw_ep *hwep = ci->ep0in;
1779         unsigned long flags;
1780
1781         spin_lock_irqsave(hwep->lock, flags);
1782         _gadget->is_selfpowered = (is_on != 0);
1783         spin_unlock_irqrestore(hwep->lock, flags);
1784
1785         return 0;
1786 }
1787
1788 /* Change Data+ pullup status
1789  * this func is used by usb_gadget_connect/disconnect
1790  */
1791 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1792 {
1793         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1794
1795         /*
1796          * Data+ pullup controlled by OTG state machine in OTG fsm mode;
1797          * and don't touch Data+ in host mode for dual role config.
1798          */
1799         if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST)
1800                 return 0;
1801
1802         pm_runtime_get_sync(ci->dev);
1803         if (is_on)
1804                 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1805         else
1806                 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1807         pm_runtime_put_sync(ci->dev);
1808
1809         return 0;
1810 }
1811
1812 static int ci_udc_start(struct usb_gadget *gadget,
1813                          struct usb_gadget_driver *driver);
1814 static int ci_udc_stop(struct usb_gadget *gadget);
1815
1816 /* Match ISOC IN from the highest endpoint */
1817 static struct usb_ep *ci_udc_match_ep(struct usb_gadget *gadget,
1818                               struct usb_endpoint_descriptor *desc,
1819                               struct usb_ss_ep_comp_descriptor *comp_desc)
1820 {
1821         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1822         struct usb_ep *ep;
1823
1824         if (usb_endpoint_xfer_isoc(desc) && usb_endpoint_dir_in(desc)) {
1825                 list_for_each_entry_reverse(ep, &ci->gadget.ep_list, ep_list) {
1826                         if (ep->caps.dir_in && !ep->claimed)
1827                                 return ep;
1828                 }
1829         }
1830
1831         return NULL;
1832 }
1833
1834 /*
1835  * Device operations part of the API to the USB controller hardware,
1836  * which don't involve endpoints (or i/o)
1837  * Check  "usb_gadget.h" for details
1838  */
1839 static const struct usb_gadget_ops usb_gadget_ops = {
1840         .get_frame      = ci_udc_get_frame,
1841         .vbus_session   = ci_udc_vbus_session,
1842         .wakeup         = ci_udc_wakeup,
1843         .set_selfpowered        = ci_udc_selfpowered,
1844         .pullup         = ci_udc_pullup,
1845         .vbus_draw      = ci_udc_vbus_draw,
1846         .udc_start      = ci_udc_start,
1847         .udc_stop       = ci_udc_stop,
1848         .match_ep       = ci_udc_match_ep,
1849 };
1850
1851 static int init_eps(struct ci_hdrc *ci)
1852 {
1853         int retval = 0, i, j;
1854
1855         for (i = 0; i < ci->hw_ep_max/2; i++)
1856                 for (j = RX; j <= TX; j++) {
1857                         int k = i + j * ci->hw_ep_max/2;
1858                         struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1859
1860                         scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1861                                         (j == TX)  ? "in" : "out");
1862
1863                         hwep->ci          = ci;
1864                         hwep->lock         = &ci->lock;
1865                         hwep->td_pool      = ci->td_pool;
1866
1867                         hwep->ep.name      = hwep->name;
1868                         hwep->ep.ops       = &usb_ep_ops;
1869
1870                         if (i == 0) {
1871                                 hwep->ep.caps.type_control = true;
1872                         } else {
1873                                 hwep->ep.caps.type_iso = true;
1874                                 hwep->ep.caps.type_bulk = true;
1875                                 hwep->ep.caps.type_int = true;
1876                         }
1877
1878                         if (j == TX)
1879                                 hwep->ep.caps.dir_in = true;
1880                         else
1881                                 hwep->ep.caps.dir_out = true;
1882
1883                         /*
1884                          * for ep0: maxP defined in desc, for other
1885                          * eps, maxP is set by epautoconfig() called
1886                          * by gadget layer
1887                          */
1888                         usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1889
1890                         INIT_LIST_HEAD(&hwep->qh.queue);
1891                         hwep->qh.ptr = dma_pool_zalloc(ci->qh_pool, GFP_KERNEL,
1892                                                        &hwep->qh.dma);
1893                         if (hwep->qh.ptr == NULL)
1894                                 retval = -ENOMEM;
1895
1896                         /*
1897                          * set up shorthands for ep0 out and in endpoints,
1898                          * don't add to gadget's ep_list
1899                          */
1900                         if (i == 0) {
1901                                 if (j == RX)
1902                                         ci->ep0out = hwep;
1903                                 else
1904                                         ci->ep0in = hwep;
1905
1906                                 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1907                                 continue;
1908                         }
1909
1910                         list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1911                 }
1912
1913         return retval;
1914 }
1915
1916 static void destroy_eps(struct ci_hdrc *ci)
1917 {
1918         int i;
1919
1920         for (i = 0; i < ci->hw_ep_max; i++) {
1921                 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1922
1923                 if (hwep->pending_td)
1924                         free_pending_td(hwep);
1925                 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1926         }
1927 }
1928
1929 /**
1930  * ci_udc_start: register a gadget driver
1931  * @gadget: our gadget
1932  * @driver: the driver being registered
1933  *
1934  * Interrupts are enabled here.
1935  */
1936 static int ci_udc_start(struct usb_gadget *gadget,
1937                          struct usb_gadget_driver *driver)
1938 {
1939         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1940         int retval;
1941
1942         if (driver->disconnect == NULL)
1943                 return -EINVAL;
1944
1945         ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1946         retval = usb_ep_enable(&ci->ep0out->ep);
1947         if (retval)
1948                 return retval;
1949
1950         ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1951         retval = usb_ep_enable(&ci->ep0in->ep);
1952         if (retval)
1953                 return retval;
1954
1955         ci->driver = driver;
1956
1957         /* Start otg fsm for B-device */
1958         if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1959                 ci_hdrc_otg_fsm_start(ci);
1960                 return retval;
1961         }
1962
1963         if (ci->vbus_active)
1964                 ci_hdrc_gadget_connect(gadget, 1);
1965         else
1966                 usb_udc_vbus_handler(&ci->gadget, false);
1967
1968         return retval;
1969 }
1970
1971 static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
1972 {
1973         if (!ci_otg_is_fsm_mode(ci))
1974                 return;
1975
1976         mutex_lock(&ci->fsm.lock);
1977         if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
1978                 ci->fsm.a_bidl_adis_tmout = 1;
1979                 ci_hdrc_otg_fsm_start(ci);
1980         } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
1981                 ci->fsm.protocol = PROTO_UNDEF;
1982                 ci->fsm.otg->state = OTG_STATE_UNDEFINED;
1983         }
1984         mutex_unlock(&ci->fsm.lock);
1985 }
1986
1987 /*
1988  * ci_udc_stop: unregister a gadget driver
1989  */
1990 static int ci_udc_stop(struct usb_gadget *gadget)
1991 {
1992         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1993         unsigned long flags;
1994
1995         spin_lock_irqsave(&ci->lock, flags);
1996         ci->driver = NULL;
1997
1998         if (ci->vbus_active) {
1999                 hw_device_state(ci, 0);
2000                 spin_unlock_irqrestore(&ci->lock, flags);
2001                 if (ci->platdata->notify_event)
2002                         ci->platdata->notify_event(ci,
2003                         CI_HDRC_CONTROLLER_STOPPED_EVENT);
2004                 _gadget_stop_activity(&ci->gadget);
2005                 spin_lock_irqsave(&ci->lock, flags);
2006                 pm_runtime_put(ci->dev);
2007         }
2008
2009         spin_unlock_irqrestore(&ci->lock, flags);
2010
2011         ci_udc_stop_for_otg_fsm(ci);
2012         return 0;
2013 }
2014
2015 /******************************************************************************
2016  * BUS block
2017  *****************************************************************************/
2018 /*
2019  * udc_irq: ci interrupt handler
2020  *
2021  * This function returns IRQ_HANDLED if the IRQ has been handled
2022  * It locks access to registers
2023  */
2024 static irqreturn_t udc_irq(struct ci_hdrc *ci)
2025 {
2026         irqreturn_t retval;
2027         u32 intr;
2028
2029         if (ci == NULL)
2030                 return IRQ_HANDLED;
2031
2032         spin_lock(&ci->lock);
2033
2034         if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
2035                 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
2036                                 USBMODE_CM_DC) {
2037                         spin_unlock(&ci->lock);
2038                         return IRQ_NONE;
2039                 }
2040         }
2041         intr = hw_test_and_clear_intr_active(ci);
2042
2043         if (intr) {
2044                 /* order defines priority - do NOT change it */
2045                 if (USBi_URI & intr)
2046                         isr_reset_handler(ci);
2047
2048                 if (USBi_PCI & intr) {
2049                         ci->gadget.speed = hw_port_is_high_speed(ci) ?
2050                                 USB_SPEED_HIGH : USB_SPEED_FULL;
2051                         if (ci->usb_phy)
2052                                 usb_phy_set_event(ci->usb_phy,
2053                                         USB_EVENT_ENUMERATED);
2054                         if (ci->suspended) {
2055                                 if (ci->driver->resume) {
2056                                         spin_unlock(&ci->lock);
2057                                         ci->driver->resume(&ci->gadget);
2058                                         spin_lock(&ci->lock);
2059                                 }
2060                                 ci->suspended = 0;
2061                                 usb_gadget_set_state(&ci->gadget,
2062                                                 ci->resume_state);
2063                         }
2064                 }
2065
2066                 if (USBi_UI  & intr)
2067                         isr_tr_complete_handler(ci);
2068
2069                 if ((USBi_SLI & intr) && !(ci->suspended)) {
2070                         ci->suspended = 1;
2071                         ci->resume_state = ci->gadget.state;
2072                         if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
2073                             ci->driver->suspend) {
2074                                 spin_unlock(&ci->lock);
2075                                 ci->driver->suspend(&ci->gadget);
2076                                 spin_lock(&ci->lock);
2077                         }
2078                         usb_gadget_set_state(&ci->gadget,
2079                                         USB_STATE_SUSPENDED);
2080                 }
2081                 retval = IRQ_HANDLED;
2082         } else {
2083                 retval = IRQ_NONE;
2084         }
2085         spin_unlock(&ci->lock);
2086
2087         return retval;
2088 }
2089
2090 /**
2091  * udc_start: initialize gadget role
2092  * @ci: chipidea controller
2093  */
2094 static int udc_start(struct ci_hdrc *ci)
2095 {
2096         struct device *dev = ci->dev;
2097         struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
2098         int retval = 0;
2099
2100         ci->gadget.ops          = &usb_gadget_ops;
2101         ci->gadget.speed        = USB_SPEED_UNKNOWN;
2102         ci->gadget.max_speed    = USB_SPEED_HIGH;
2103         ci->gadget.name         = ci->platdata->name;
2104         ci->gadget.otg_caps     = otg_caps;
2105         ci->gadget.sg_supported = 1;
2106         ci->gadget.irq          = ci->irq;
2107
2108         if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA)
2109                 ci->gadget.quirk_avoids_skb_reserve = 1;
2110
2111         if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
2112                                                 otg_caps->adp_support))
2113                 ci->gadget.is_otg = 1;
2114
2115         INIT_LIST_HEAD(&ci->gadget.ep_list);
2116
2117         /* alloc resources */
2118         ci->qh_pool = dma_pool_create("ci_hw_qh", dev->parent,
2119                                        sizeof(struct ci_hw_qh),
2120                                        64, CI_HDRC_PAGE_SIZE);
2121         if (ci->qh_pool == NULL)
2122                 return -ENOMEM;
2123
2124         ci->td_pool = dma_pool_create("ci_hw_td", dev->parent,
2125                                        sizeof(struct ci_hw_td),
2126                                        64, CI_HDRC_PAGE_SIZE);
2127         if (ci->td_pool == NULL) {
2128                 retval = -ENOMEM;
2129                 goto free_qh_pool;
2130         }
2131
2132         retval = init_eps(ci);
2133         if (retval)
2134                 goto free_pools;
2135
2136         ci->gadget.ep0 = &ci->ep0in->ep;
2137
2138         retval = usb_add_gadget_udc(dev, &ci->gadget);
2139         if (retval)
2140                 goto destroy_eps;
2141
2142         return retval;
2143
2144 destroy_eps:
2145         destroy_eps(ci);
2146 free_pools:
2147         dma_pool_destroy(ci->td_pool);
2148 free_qh_pool:
2149         dma_pool_destroy(ci->qh_pool);
2150         return retval;
2151 }
2152
2153 /*
2154  * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
2155  *
2156  * No interrupts active, the IRQ has been released
2157  */
2158 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
2159 {
2160         if (!ci->roles[CI_ROLE_GADGET])
2161                 return;
2162
2163         usb_del_gadget_udc(&ci->gadget);
2164
2165         destroy_eps(ci);
2166
2167         dma_pool_destroy(ci->td_pool);
2168         dma_pool_destroy(ci->qh_pool);
2169 }
2170
2171 static int udc_id_switch_for_device(struct ci_hdrc *ci)
2172 {
2173         if (ci->platdata->pins_device)
2174                 pinctrl_select_state(ci->platdata->pctl,
2175                                      ci->platdata->pins_device);
2176
2177         if (ci->is_otg)
2178                 /* Clear and enable BSV irq */
2179                 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
2180                                         OTGSC_BSVIS | OTGSC_BSVIE);
2181
2182         return 0;
2183 }
2184
2185 static void udc_id_switch_for_host(struct ci_hdrc *ci)
2186 {
2187         /*
2188          * host doesn't care B_SESSION_VALID event
2189          * so clear and disable BSV irq
2190          */
2191         if (ci->is_otg)
2192                 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
2193
2194         ci->vbus_active = 0;
2195
2196         if (ci->platdata->pins_device && ci->platdata->pins_default)
2197                 pinctrl_select_state(ci->platdata->pctl,
2198                                      ci->platdata->pins_default);
2199 }
2200
2201 #ifdef CONFIG_PM_SLEEP
2202 static void udc_suspend(struct ci_hdrc *ci)
2203 {
2204         /*
2205          * Set OP_ENDPTLISTADDR to be non-zero for
2206          * checking if controller resume from power lost
2207          * in non-host mode.
2208          */
2209         if (hw_read(ci, OP_ENDPTLISTADDR, ~0) == 0)
2210                 hw_write(ci, OP_ENDPTLISTADDR, ~0, ~0);
2211 }
2212
2213 static void udc_resume(struct ci_hdrc *ci, bool power_lost)
2214 {
2215         if (power_lost) {
2216                 if (ci->is_otg)
2217                         hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
2218                                         OTGSC_BSVIS | OTGSC_BSVIE);
2219                 if (ci->vbus_active)
2220                         usb_gadget_vbus_disconnect(&ci->gadget);
2221         }
2222
2223         /* Restore value 0 if it was set for power lost check */
2224         if (hw_read(ci, OP_ENDPTLISTADDR, ~0) == 0xFFFFFFFF)
2225                 hw_write(ci, OP_ENDPTLISTADDR, ~0, 0);
2226 }
2227 #endif
2228
2229 /**
2230  * ci_hdrc_gadget_init - initialize device related bits
2231  * @ci: the controller
2232  *
2233  * This function initializes the gadget, if the device is "device capable".
2234  */
2235 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
2236 {
2237         struct ci_role_driver *rdrv;
2238         int ret;
2239
2240         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
2241                 return -ENXIO;
2242
2243         rdrv = devm_kzalloc(ci->dev, sizeof(*rdrv), GFP_KERNEL);
2244         if (!rdrv)
2245                 return -ENOMEM;
2246
2247         rdrv->start     = udc_id_switch_for_device;
2248         rdrv->stop      = udc_id_switch_for_host;
2249 #ifdef CONFIG_PM_SLEEP
2250         rdrv->suspend   = udc_suspend;
2251         rdrv->resume    = udc_resume;
2252 #endif
2253         rdrv->irq       = udc_irq;
2254         rdrv->name      = "gadget";
2255
2256         ret = udc_start(ci);
2257         if (!ret)
2258                 ci->roles[CI_ROLE_GADGET] = rdrv;
2259
2260         return ret;
2261 }