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 (req->status < 0)
1052                 return;
1053
1054         if (ci->setaddr) {
1055                 hw_usb_set_address(ci, ci->address);
1056                 ci->setaddr = false;
1057                 if (ci->address)
1058                         usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
1059         }
1060
1061         spin_lock_irqsave(&ci->lock, flags);
1062         if (ci->test_mode)
1063                 hw_port_test_set(ci, ci->test_mode);
1064         spin_unlock_irqrestore(&ci->lock, flags);
1065 }
1066
1067 /**
1068  * isr_setup_status_phase: queues the status phase of a setup transation
1069  * @ci: ci struct
1070  *
1071  * This function returns an error code
1072  */
1073 static int isr_setup_status_phase(struct ci_hdrc *ci)
1074 {
1075         struct ci_hw_ep *hwep;
1076
1077         /*
1078          * Unexpected USB controller behavior, caused by bad signal integrity
1079          * or ground reference problems, can lead to isr_setup_status_phase
1080          * being called with ci->status equal to NULL.
1081          * If this situation occurs, you should review your USB hardware design.
1082          */
1083         if (WARN_ON_ONCE(!ci->status))
1084                 return -EPIPE;
1085
1086         hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
1087         ci->status->context = ci;
1088         ci->status->complete = isr_setup_status_complete;
1089
1090         return _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
1091 }
1092
1093 /**
1094  * isr_tr_complete_low: transaction complete low level handler
1095  * @hwep: endpoint
1096  *
1097  * This function returns an error code
1098  * Caller must hold lock
1099  */
1100 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
1101 __releases(hwep->lock)
1102 __acquires(hwep->lock)
1103 {
1104         struct ci_hw_req *hwreq, *hwreqtemp;
1105         struct ci_hw_ep *hweptemp = hwep;
1106         int retval = 0;
1107
1108         list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
1109                         queue) {
1110                 retval = _hardware_dequeue(hwep, hwreq);
1111                 if (retval < 0)
1112                         break;
1113                 list_del_init(&hwreq->queue);
1114                 if (hwreq->req.complete != NULL) {
1115                         spin_unlock(hwep->lock);
1116                         if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
1117                                         hwreq->req.length)
1118                                 hweptemp = hwep->ci->ep0in;
1119                         usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
1120                         spin_lock(hwep->lock);
1121                 }
1122         }
1123
1124         if (retval == -EBUSY)
1125                 retval = 0;
1126
1127         return retval;
1128 }
1129
1130 static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
1131 {
1132         dev_warn(&ci->gadget.dev,
1133                 "connect the device to an alternate port if you want HNP\n");
1134         return isr_setup_status_phase(ci);
1135 }
1136
1137 /**
1138  * isr_setup_packet_handler: setup packet handler
1139  * @ci: UDC descriptor
1140  *
1141  * This function handles setup packet
1142  */
1143 static void isr_setup_packet_handler(struct ci_hdrc *ci)
1144 __releases(ci->lock)
1145 __acquires(ci->lock)
1146 {
1147         struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1148         struct usb_ctrlrequest req;
1149         int type, num, dir, err = -EINVAL;
1150         u8 tmode = 0;
1151
1152         /*
1153          * Flush data and handshake transactions of previous
1154          * setup packet.
1155          */
1156         _ep_nuke(ci->ep0out);
1157         _ep_nuke(ci->ep0in);
1158
1159         /* read_setup_packet */
1160         do {
1161                 hw_test_and_set_setup_guard(ci);
1162                 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1163         } while (!hw_test_and_clear_setup_guard(ci));
1164
1165         type = req.bRequestType;
1166
1167         ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1168
1169         switch (req.bRequest) {
1170         case USB_REQ_CLEAR_FEATURE:
1171                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1172                                 le16_to_cpu(req.wValue) ==
1173                                 USB_ENDPOINT_HALT) {
1174                         if (req.wLength != 0)
1175                                 break;
1176                         num  = le16_to_cpu(req.wIndex);
1177                         dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1178                         num &= USB_ENDPOINT_NUMBER_MASK;
1179                         if (dir == TX)
1180                                 num += ci->hw_ep_max / 2;
1181                         if (!ci->ci_hw_ep[num].wedge) {
1182                                 spin_unlock(&ci->lock);
1183                                 err = usb_ep_clear_halt(
1184                                         &ci->ci_hw_ep[num].ep);
1185                                 spin_lock(&ci->lock);
1186                                 if (err)
1187                                         break;
1188                         }
1189                         err = isr_setup_status_phase(ci);
1190                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1191                                 le16_to_cpu(req.wValue) ==
1192                                 USB_DEVICE_REMOTE_WAKEUP) {
1193                         if (req.wLength != 0)
1194                                 break;
1195                         ci->remote_wakeup = 0;
1196                         err = isr_setup_status_phase(ci);
1197                 } else {
1198                         goto delegate;
1199                 }
1200                 break;
1201         case USB_REQ_GET_STATUS:
1202                 if ((type != (USB_DIR_IN|USB_RECIP_DEVICE) ||
1203                         le16_to_cpu(req.wIndex) == OTG_STS_SELECTOR) &&
1204                     type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1205                     type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1206                         goto delegate;
1207                 if (le16_to_cpu(req.wLength) != 2 ||
1208                     le16_to_cpu(req.wValue)  != 0)
1209                         break;
1210                 err = isr_get_status_response(ci, &req);
1211                 break;
1212         case USB_REQ_SET_ADDRESS:
1213                 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1214                         goto delegate;
1215                 if (le16_to_cpu(req.wLength) != 0 ||
1216                     le16_to_cpu(req.wIndex)  != 0)
1217                         break;
1218                 ci->address = (u8)le16_to_cpu(req.wValue);
1219                 ci->setaddr = true;
1220                 err = isr_setup_status_phase(ci);
1221                 break;
1222         case USB_REQ_SET_FEATURE:
1223                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1224                                 le16_to_cpu(req.wValue) ==
1225                                 USB_ENDPOINT_HALT) {
1226                         if (req.wLength != 0)
1227                                 break;
1228                         num  = le16_to_cpu(req.wIndex);
1229                         dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1230                         num &= USB_ENDPOINT_NUMBER_MASK;
1231                         if (dir == TX)
1232                                 num += ci->hw_ep_max / 2;
1233
1234                         spin_unlock(&ci->lock);
1235                         err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1236                         spin_lock(&ci->lock);
1237                         if (!err)
1238                                 isr_setup_status_phase(ci);
1239                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1240                         if (req.wLength != 0)
1241                                 break;
1242                         switch (le16_to_cpu(req.wValue)) {
1243                         case USB_DEVICE_REMOTE_WAKEUP:
1244                                 ci->remote_wakeup = 1;
1245                                 err = isr_setup_status_phase(ci);
1246                                 break;
1247                         case USB_DEVICE_TEST_MODE:
1248                                 tmode = le16_to_cpu(req.wIndex) >> 8;
1249                                 switch (tmode) {
1250                                 case USB_TEST_J:
1251                                 case USB_TEST_K:
1252                                 case USB_TEST_SE0_NAK:
1253                                 case USB_TEST_PACKET:
1254                                 case USB_TEST_FORCE_ENABLE:
1255                                         ci->test_mode = tmode;
1256                                         err = isr_setup_status_phase(
1257                                                         ci);
1258                                         break;
1259                                 default:
1260                                         break;
1261                                 }
1262                                 break;
1263                         case USB_DEVICE_B_HNP_ENABLE:
1264                                 if (ci_otg_is_fsm_mode(ci)) {
1265                                         ci->gadget.b_hnp_enable = 1;
1266                                         err = isr_setup_status_phase(
1267                                                         ci);
1268                                 }
1269                                 break;
1270                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1271                                 if (ci_otg_is_fsm_mode(ci))
1272                                         err = otg_a_alt_hnp_support(ci);
1273                                 break;
1274                         case USB_DEVICE_A_HNP_SUPPORT:
1275                                 if (ci_otg_is_fsm_mode(ci)) {
1276                                         ci->gadget.a_hnp_support = 1;
1277                                         err = isr_setup_status_phase(
1278                                                         ci);
1279                                 }
1280                                 break;
1281                         default:
1282                                 goto delegate;
1283                         }
1284                 } else {
1285                         goto delegate;
1286                 }
1287                 break;
1288         default:
1289 delegate:
1290                 if (req.wLength == 0)   /* no data phase */
1291                         ci->ep0_dir = TX;
1292
1293                 spin_unlock(&ci->lock);
1294                 err = ci->driver->setup(&ci->gadget, &req);
1295                 spin_lock(&ci->lock);
1296                 break;
1297         }
1298
1299         if (err < 0) {
1300                 spin_unlock(&ci->lock);
1301                 if (_ep_set_halt(&hwep->ep, 1, false))
1302                         dev_err(ci->dev, "error: _ep_set_halt\n");
1303                 spin_lock(&ci->lock);
1304         }
1305 }
1306
1307 /**
1308  * isr_tr_complete_handler: transaction complete interrupt handler
1309  * @ci: UDC descriptor
1310  *
1311  * This function handles traffic events
1312  */
1313 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1314 __releases(ci->lock)
1315 __acquires(ci->lock)
1316 {
1317         unsigned i;
1318         int err;
1319
1320         for (i = 0; i < ci->hw_ep_max; i++) {
1321                 struct ci_hw_ep *hwep  = &ci->ci_hw_ep[i];
1322
1323                 if (hwep->ep.desc == NULL)
1324                         continue;   /* not configured */
1325
1326                 if (hw_test_and_clear_complete(ci, i)) {
1327                         err = isr_tr_complete_low(hwep);
1328                         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1329                                 if (err > 0)   /* needs status phase */
1330                                         err = isr_setup_status_phase(ci);
1331                                 if (err < 0) {
1332                                         spin_unlock(&ci->lock);
1333                                         if (_ep_set_halt(&hwep->ep, 1, false))
1334                                                 dev_err(ci->dev,
1335                                                 "error: _ep_set_halt\n");
1336                                         spin_lock(&ci->lock);
1337                                 }
1338                         }
1339                 }
1340
1341                 /* Only handle setup packet below */
1342                 if (i == 0 &&
1343                         hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1344                         isr_setup_packet_handler(ci);
1345         }
1346 }
1347
1348 /******************************************************************************
1349  * ENDPT block
1350  *****************************************************************************/
1351 /*
1352  * ep_enable: configure endpoint, making it usable
1353  *
1354  * Check usb_ep_enable() at "usb_gadget.h" for details
1355  */
1356 static int ep_enable(struct usb_ep *ep,
1357                      const struct usb_endpoint_descriptor *desc)
1358 {
1359         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1360         int retval = 0;
1361         unsigned long flags;
1362         u32 cap = 0;
1363
1364         if (ep == NULL || desc == NULL)
1365                 return -EINVAL;
1366
1367         spin_lock_irqsave(hwep->lock, flags);
1368
1369         /* only internal SW should enable ctrl endpts */
1370
1371         if (!list_empty(&hwep->qh.queue)) {
1372                 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1373                 spin_unlock_irqrestore(hwep->lock, flags);
1374                 return -EBUSY;
1375         }
1376
1377         hwep->ep.desc = desc;
1378
1379         hwep->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
1380         hwep->num  = usb_endpoint_num(desc);
1381         hwep->type = usb_endpoint_type(desc);
1382
1383         hwep->ep.maxpacket = usb_endpoint_maxp(desc);
1384         hwep->ep.mult = usb_endpoint_maxp_mult(desc);
1385
1386         if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1387                 cap |= QH_IOS;
1388
1389         cap |= QH_ZLT;
1390         cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1391         /*
1392          * For ISO-TX, we set mult at QH as the largest value, and use
1393          * MultO at TD as real mult value.
1394          */
1395         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1396                 cap |= 3 << __ffs(QH_MULT);
1397
1398         hwep->qh.ptr->cap = cpu_to_le32(cap);
1399
1400         hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE);   /* needed? */
1401
1402         if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1403                 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1404                 retval = -EINVAL;
1405         }
1406
1407         /*
1408          * Enable endpoints in the HW other than ep0 as ep0
1409          * is always enabled
1410          */
1411         if (hwep->num)
1412                 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1413                                        hwep->type);
1414
1415         spin_unlock_irqrestore(hwep->lock, flags);
1416         return retval;
1417 }
1418
1419 /*
1420  * ep_disable: endpoint is no longer usable
1421  *
1422  * Check usb_ep_disable() at "usb_gadget.h" for details
1423  */
1424 static int ep_disable(struct usb_ep *ep)
1425 {
1426         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1427         int direction, retval = 0;
1428         unsigned long flags;
1429
1430         if (ep == NULL)
1431                 return -EINVAL;
1432         else if (hwep->ep.desc == NULL)
1433                 return -EBUSY;
1434
1435         spin_lock_irqsave(hwep->lock, flags);
1436         if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1437                 spin_unlock_irqrestore(hwep->lock, flags);
1438                 return 0;
1439         }
1440
1441         /* only internal SW should disable ctrl endpts */
1442
1443         direction = hwep->dir;
1444         do {
1445                 retval |= _ep_nuke(hwep);
1446                 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1447
1448                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1449                         hwep->dir = (hwep->dir == TX) ? RX : TX;
1450
1451         } while (hwep->dir != direction);
1452
1453         hwep->ep.desc = NULL;
1454
1455         spin_unlock_irqrestore(hwep->lock, flags);
1456         return retval;
1457 }
1458
1459 /*
1460  * ep_alloc_request: allocate a request object to use with this endpoint
1461  *
1462  * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1463  */
1464 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1465 {
1466         struct ci_hw_req *hwreq = NULL;
1467
1468         if (ep == NULL)
1469                 return NULL;
1470
1471         hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1472         if (hwreq != NULL) {
1473                 INIT_LIST_HEAD(&hwreq->queue);
1474                 INIT_LIST_HEAD(&hwreq->tds);
1475         }
1476
1477         return (hwreq == NULL) ? NULL : &hwreq->req;
1478 }
1479
1480 /*
1481  * ep_free_request: frees a request object
1482  *
1483  * Check usb_ep_free_request() at "usb_gadget.h" for details
1484  */
1485 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1486 {
1487         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1488         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1489         struct td_node *node, *tmpnode;
1490         unsigned long flags;
1491
1492         if (ep == NULL || req == NULL) {
1493                 return;
1494         } else if (!list_empty(&hwreq->queue)) {
1495                 dev_err(hwep->ci->dev, "freeing queued request\n");
1496                 return;
1497         }
1498
1499         spin_lock_irqsave(hwep->lock, flags);
1500
1501         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1502                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1503                 list_del_init(&node->td);
1504                 node->ptr = NULL;
1505                 kfree(node);
1506         }
1507
1508         kfree(hwreq);
1509
1510         spin_unlock_irqrestore(hwep->lock, flags);
1511 }
1512
1513 /*
1514  * ep_queue: queues (submits) an I/O request to an endpoint
1515  *
1516  * Check usb_ep_queue()* at usb_gadget.h" for details
1517  */
1518 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1519                     gfp_t __maybe_unused gfp_flags)
1520 {
1521         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1522         int retval = 0;
1523         unsigned long flags;
1524
1525         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1526                 return -EINVAL;
1527
1528         spin_lock_irqsave(hwep->lock, flags);
1529         if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1530                 spin_unlock_irqrestore(hwep->lock, flags);
1531                 return 0;
1532         }
1533         retval = _ep_queue(ep, req, gfp_flags);
1534         spin_unlock_irqrestore(hwep->lock, flags);
1535         return retval;
1536 }
1537
1538 /*
1539  * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1540  *
1541  * Check usb_ep_dequeue() at "usb_gadget.h" for details
1542  */
1543 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1544 {
1545         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1546         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1547         unsigned long flags;
1548         struct td_node *node, *tmpnode;
1549
1550         if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1551                 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1552                 list_empty(&hwep->qh.queue))
1553                 return -EINVAL;
1554
1555         spin_lock_irqsave(hwep->lock, flags);
1556         if (hwep->ci->gadget.speed != USB_SPEED_UNKNOWN)
1557                 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1558
1559         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1560                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1561                 list_del(&node->td);
1562                 kfree(node);
1563         }
1564
1565         /* pop request */
1566         list_del_init(&hwreq->queue);
1567
1568         usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1569
1570         req->status = -ECONNRESET;
1571
1572         if (hwreq->req.complete != NULL) {
1573                 spin_unlock(hwep->lock);
1574                 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1575                 spin_lock(hwep->lock);
1576         }
1577
1578         spin_unlock_irqrestore(hwep->lock, flags);
1579         return 0;
1580 }
1581
1582 /*
1583  * ep_set_halt: sets the endpoint halt feature
1584  *
1585  * Check usb_ep_set_halt() at "usb_gadget.h" for details
1586  */
1587 static int ep_set_halt(struct usb_ep *ep, int value)
1588 {
1589         return _ep_set_halt(ep, value, true);
1590 }
1591
1592 /*
1593  * ep_set_wedge: sets the halt feature and ignores clear requests
1594  *
1595  * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1596  */
1597 static int ep_set_wedge(struct usb_ep *ep)
1598 {
1599         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1600         unsigned long flags;
1601
1602         if (ep == NULL || hwep->ep.desc == NULL)
1603                 return -EINVAL;
1604
1605         spin_lock_irqsave(hwep->lock, flags);
1606         hwep->wedge = 1;
1607         spin_unlock_irqrestore(hwep->lock, flags);
1608
1609         return usb_ep_set_halt(ep);
1610 }
1611
1612 /*
1613  * ep_fifo_flush: flushes contents of a fifo
1614  *
1615  * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1616  */
1617 static void ep_fifo_flush(struct usb_ep *ep)
1618 {
1619         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1620         unsigned long flags;
1621
1622         if (ep == NULL) {
1623                 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1624                 return;
1625         }
1626
1627         spin_lock_irqsave(hwep->lock, flags);
1628         if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1629                 spin_unlock_irqrestore(hwep->lock, flags);
1630                 return;
1631         }
1632
1633         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1634
1635         spin_unlock_irqrestore(hwep->lock, flags);
1636 }
1637
1638 /*
1639  * Endpoint-specific part of the API to the USB controller hardware
1640  * Check "usb_gadget.h" for details
1641  */
1642 static const struct usb_ep_ops usb_ep_ops = {
1643         .enable        = ep_enable,
1644         .disable       = ep_disable,
1645         .alloc_request = ep_alloc_request,
1646         .free_request  = ep_free_request,
1647         .queue         = ep_queue,
1648         .dequeue       = ep_dequeue,
1649         .set_halt      = ep_set_halt,
1650         .set_wedge     = ep_set_wedge,
1651         .fifo_flush    = ep_fifo_flush,
1652 };
1653
1654 /******************************************************************************
1655  * GADGET block
1656  *****************************************************************************/
1657
1658 static int ci_udc_get_frame(struct usb_gadget *_gadget)
1659 {
1660         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1661         unsigned long flags;
1662         int ret;
1663
1664         spin_lock_irqsave(&ci->lock, flags);
1665         ret = hw_read(ci, OP_FRINDEX, 0x3fff);
1666         spin_unlock_irqrestore(&ci->lock, flags);
1667         return ret >> 3;
1668 }
1669
1670 /*
1671  * ci_hdrc_gadget_connect: caller makes sure gadget driver is binded
1672  */
1673 static void ci_hdrc_gadget_connect(struct usb_gadget *_gadget, int is_active)
1674 {
1675         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1676
1677         if (is_active) {
1678                 pm_runtime_get_sync(ci->dev);
1679                 hw_device_reset(ci);
1680                 spin_lock_irq(&ci->lock);
1681                 if (ci->driver) {
1682                         hw_device_state(ci, ci->ep0out->qh.dma);
1683                         usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1684                         spin_unlock_irq(&ci->lock);
1685                         usb_udc_vbus_handler(_gadget, true);
1686                 } else {
1687                         spin_unlock_irq(&ci->lock);
1688                 }
1689         } else {
1690                 usb_udc_vbus_handler(_gadget, false);
1691                 if (ci->driver)
1692                         ci->driver->disconnect(&ci->gadget);
1693                 hw_device_state(ci, 0);
1694                 if (ci->platdata->notify_event)
1695                         ci->platdata->notify_event(ci,
1696                         CI_HDRC_CONTROLLER_STOPPED_EVENT);
1697                 _gadget_stop_activity(&ci->gadget);
1698                 pm_runtime_put_sync(ci->dev);
1699                 usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1700         }
1701 }
1702
1703 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1704 {
1705         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1706         unsigned long flags;
1707         int ret = 0;
1708
1709         spin_lock_irqsave(&ci->lock, flags);
1710         ci->vbus_active = is_active;
1711         spin_unlock_irqrestore(&ci->lock, flags);
1712
1713         if (ci->usb_phy)
1714                 usb_phy_set_charger_state(ci->usb_phy, is_active ?
1715                         USB_CHARGER_PRESENT : USB_CHARGER_ABSENT);
1716
1717         if (ci->platdata->notify_event)
1718                 ret = ci->platdata->notify_event(ci,
1719                                 CI_HDRC_CONTROLLER_VBUS_EVENT);
1720
1721         if (ci->driver)
1722                 ci_hdrc_gadget_connect(_gadget, is_active);
1723
1724         return ret;
1725 }
1726
1727 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1728 {
1729         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1730         unsigned long flags;
1731         int ret = 0;
1732
1733         spin_lock_irqsave(&ci->lock, flags);
1734         if (ci->gadget.speed == USB_SPEED_UNKNOWN) {
1735                 spin_unlock_irqrestore(&ci->lock, flags);
1736                 return 0;
1737         }
1738         if (!ci->remote_wakeup) {
1739                 ret = -EOPNOTSUPP;
1740                 goto out;
1741         }
1742         if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1743                 ret = -EINVAL;
1744                 goto out;
1745         }
1746         hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1747 out:
1748         spin_unlock_irqrestore(&ci->lock, flags);
1749         return ret;
1750 }
1751
1752 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1753 {
1754         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1755
1756         if (ci->usb_phy)
1757                 return usb_phy_set_power(ci->usb_phy, ma);
1758         return -ENOTSUPP;
1759 }
1760
1761 static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1762 {
1763         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1764         struct ci_hw_ep *hwep = ci->ep0in;
1765         unsigned long flags;
1766
1767         spin_lock_irqsave(hwep->lock, flags);
1768         _gadget->is_selfpowered = (is_on != 0);
1769         spin_unlock_irqrestore(hwep->lock, flags);
1770
1771         return 0;
1772 }
1773
1774 /* Change Data+ pullup status
1775  * this func is used by usb_gadget_connect/disconnect
1776  */
1777 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1778 {
1779         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1780
1781         /*
1782          * Data+ pullup controlled by OTG state machine in OTG fsm mode;
1783          * and don't touch Data+ in host mode for dual role config.
1784          */
1785         if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST)
1786                 return 0;
1787
1788         pm_runtime_get_sync(ci->dev);
1789         if (is_on)
1790                 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1791         else
1792                 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1793         pm_runtime_put_sync(ci->dev);
1794
1795         return 0;
1796 }
1797
1798 static int ci_udc_start(struct usb_gadget *gadget,
1799                          struct usb_gadget_driver *driver);
1800 static int ci_udc_stop(struct usb_gadget *gadget);
1801
1802 /* Match ISOC IN from the highest endpoint */
1803 static struct usb_ep *ci_udc_match_ep(struct usb_gadget *gadget,
1804                               struct usb_endpoint_descriptor *desc,
1805                               struct usb_ss_ep_comp_descriptor *comp_desc)
1806 {
1807         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1808         struct usb_ep *ep;
1809
1810         if (usb_endpoint_xfer_isoc(desc) && usb_endpoint_dir_in(desc)) {
1811                 list_for_each_entry_reverse(ep, &ci->gadget.ep_list, ep_list) {
1812                         if (ep->caps.dir_in && !ep->claimed)
1813                                 return ep;
1814                 }
1815         }
1816
1817         return NULL;
1818 }
1819
1820 /*
1821  * Device operations part of the API to the USB controller hardware,
1822  * which don't involve endpoints (or i/o)
1823  * Check  "usb_gadget.h" for details
1824  */
1825 static const struct usb_gadget_ops usb_gadget_ops = {
1826         .get_frame      = ci_udc_get_frame,
1827         .vbus_session   = ci_udc_vbus_session,
1828         .wakeup         = ci_udc_wakeup,
1829         .set_selfpowered        = ci_udc_selfpowered,
1830         .pullup         = ci_udc_pullup,
1831         .vbus_draw      = ci_udc_vbus_draw,
1832         .udc_start      = ci_udc_start,
1833         .udc_stop       = ci_udc_stop,
1834         .match_ep       = ci_udc_match_ep,
1835 };
1836
1837 static int init_eps(struct ci_hdrc *ci)
1838 {
1839         int retval = 0, i, j;
1840
1841         for (i = 0; i < ci->hw_ep_max/2; i++)
1842                 for (j = RX; j <= TX; j++) {
1843                         int k = i + j * ci->hw_ep_max/2;
1844                         struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1845
1846                         scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1847                                         (j == TX)  ? "in" : "out");
1848
1849                         hwep->ci          = ci;
1850                         hwep->lock         = &ci->lock;
1851                         hwep->td_pool      = ci->td_pool;
1852
1853                         hwep->ep.name      = hwep->name;
1854                         hwep->ep.ops       = &usb_ep_ops;
1855
1856                         if (i == 0) {
1857                                 hwep->ep.caps.type_control = true;
1858                         } else {
1859                                 hwep->ep.caps.type_iso = true;
1860                                 hwep->ep.caps.type_bulk = true;
1861                                 hwep->ep.caps.type_int = true;
1862                         }
1863
1864                         if (j == TX)
1865                                 hwep->ep.caps.dir_in = true;
1866                         else
1867                                 hwep->ep.caps.dir_out = true;
1868
1869                         /*
1870                          * for ep0: maxP defined in desc, for other
1871                          * eps, maxP is set by epautoconfig() called
1872                          * by gadget layer
1873                          */
1874                         usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1875
1876                         INIT_LIST_HEAD(&hwep->qh.queue);
1877                         hwep->qh.ptr = dma_pool_zalloc(ci->qh_pool, GFP_KERNEL,
1878                                                        &hwep->qh.dma);
1879                         if (hwep->qh.ptr == NULL)
1880                                 retval = -ENOMEM;
1881
1882                         /*
1883                          * set up shorthands for ep0 out and in endpoints,
1884                          * don't add to gadget's ep_list
1885                          */
1886                         if (i == 0) {
1887                                 if (j == RX)
1888                                         ci->ep0out = hwep;
1889                                 else
1890                                         ci->ep0in = hwep;
1891
1892                                 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1893                                 continue;
1894                         }
1895
1896                         list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1897                 }
1898
1899         return retval;
1900 }
1901
1902 static void destroy_eps(struct ci_hdrc *ci)
1903 {
1904         int i;
1905
1906         for (i = 0; i < ci->hw_ep_max; i++) {
1907                 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1908
1909                 if (hwep->pending_td)
1910                         free_pending_td(hwep);
1911                 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1912         }
1913 }
1914
1915 /**
1916  * ci_udc_start: register a gadget driver
1917  * @gadget: our gadget
1918  * @driver: the driver being registered
1919  *
1920  * Interrupts are enabled here.
1921  */
1922 static int ci_udc_start(struct usb_gadget *gadget,
1923                          struct usb_gadget_driver *driver)
1924 {
1925         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1926         int retval;
1927
1928         if (driver->disconnect == NULL)
1929                 return -EINVAL;
1930
1931         ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1932         retval = usb_ep_enable(&ci->ep0out->ep);
1933         if (retval)
1934                 return retval;
1935
1936         ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1937         retval = usb_ep_enable(&ci->ep0in->ep);
1938         if (retval)
1939                 return retval;
1940
1941         ci->driver = driver;
1942
1943         /* Start otg fsm for B-device */
1944         if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1945                 ci_hdrc_otg_fsm_start(ci);
1946                 return retval;
1947         }
1948
1949         if (ci->vbus_active)
1950                 ci_hdrc_gadget_connect(gadget, 1);
1951         else
1952                 usb_udc_vbus_handler(&ci->gadget, false);
1953
1954         return retval;
1955 }
1956
1957 static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
1958 {
1959         if (!ci_otg_is_fsm_mode(ci))
1960                 return;
1961
1962         mutex_lock(&ci->fsm.lock);
1963         if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
1964                 ci->fsm.a_bidl_adis_tmout = 1;
1965                 ci_hdrc_otg_fsm_start(ci);
1966         } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
1967                 ci->fsm.protocol = PROTO_UNDEF;
1968                 ci->fsm.otg->state = OTG_STATE_UNDEFINED;
1969         }
1970         mutex_unlock(&ci->fsm.lock);
1971 }
1972
1973 /*
1974  * ci_udc_stop: unregister a gadget driver
1975  */
1976 static int ci_udc_stop(struct usb_gadget *gadget)
1977 {
1978         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1979         unsigned long flags;
1980
1981         spin_lock_irqsave(&ci->lock, flags);
1982         ci->driver = NULL;
1983
1984         if (ci->vbus_active) {
1985                 hw_device_state(ci, 0);
1986                 spin_unlock_irqrestore(&ci->lock, flags);
1987                 if (ci->platdata->notify_event)
1988                         ci->platdata->notify_event(ci,
1989                         CI_HDRC_CONTROLLER_STOPPED_EVENT);
1990                 _gadget_stop_activity(&ci->gadget);
1991                 spin_lock_irqsave(&ci->lock, flags);
1992                 pm_runtime_put(ci->dev);
1993         }
1994
1995         spin_unlock_irqrestore(&ci->lock, flags);
1996
1997         ci_udc_stop_for_otg_fsm(ci);
1998         return 0;
1999 }
2000
2001 /******************************************************************************
2002  * BUS block
2003  *****************************************************************************/
2004 /*
2005  * udc_irq: ci interrupt handler
2006  *
2007  * This function returns IRQ_HANDLED if the IRQ has been handled
2008  * It locks access to registers
2009  */
2010 static irqreturn_t udc_irq(struct ci_hdrc *ci)
2011 {
2012         irqreturn_t retval;
2013         u32 intr;
2014
2015         if (ci == NULL)
2016                 return IRQ_HANDLED;
2017
2018         spin_lock(&ci->lock);
2019
2020         if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
2021                 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
2022                                 USBMODE_CM_DC) {
2023                         spin_unlock(&ci->lock);
2024                         return IRQ_NONE;
2025                 }
2026         }
2027         intr = hw_test_and_clear_intr_active(ci);
2028
2029         if (intr) {
2030                 /* order defines priority - do NOT change it */
2031                 if (USBi_URI & intr)
2032                         isr_reset_handler(ci);
2033
2034                 if (USBi_PCI & intr) {
2035                         ci->gadget.speed = hw_port_is_high_speed(ci) ?
2036                                 USB_SPEED_HIGH : USB_SPEED_FULL;
2037                         if (ci->suspended) {
2038                                 if (ci->driver->resume) {
2039                                         spin_unlock(&ci->lock);
2040                                         ci->driver->resume(&ci->gadget);
2041                                         spin_lock(&ci->lock);
2042                                 }
2043                                 ci->suspended = 0;
2044                                 usb_gadget_set_state(&ci->gadget,
2045                                                 ci->resume_state);
2046                         }
2047                 }
2048
2049                 if (USBi_UI  & intr)
2050                         isr_tr_complete_handler(ci);
2051
2052                 if ((USBi_SLI & intr) && !(ci->suspended)) {
2053                         ci->suspended = 1;
2054                         ci->resume_state = ci->gadget.state;
2055                         if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
2056                             ci->driver->suspend) {
2057                                 spin_unlock(&ci->lock);
2058                                 ci->driver->suspend(&ci->gadget);
2059                                 spin_lock(&ci->lock);
2060                         }
2061                         usb_gadget_set_state(&ci->gadget,
2062                                         USB_STATE_SUSPENDED);
2063                 }
2064                 retval = IRQ_HANDLED;
2065         } else {
2066                 retval = IRQ_NONE;
2067         }
2068         spin_unlock(&ci->lock);
2069
2070         return retval;
2071 }
2072
2073 /**
2074  * udc_start: initialize gadget role
2075  * @ci: chipidea controller
2076  */
2077 static int udc_start(struct ci_hdrc *ci)
2078 {
2079         struct device *dev = ci->dev;
2080         struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
2081         int retval = 0;
2082
2083         ci->gadget.ops          = &usb_gadget_ops;
2084         ci->gadget.speed        = USB_SPEED_UNKNOWN;
2085         ci->gadget.max_speed    = USB_SPEED_HIGH;
2086         ci->gadget.name         = ci->platdata->name;
2087         ci->gadget.otg_caps     = otg_caps;
2088         ci->gadget.sg_supported = 1;
2089         ci->gadget.irq          = ci->irq;
2090
2091         if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA)
2092                 ci->gadget.quirk_avoids_skb_reserve = 1;
2093
2094         if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
2095                                                 otg_caps->adp_support))
2096                 ci->gadget.is_otg = 1;
2097
2098         INIT_LIST_HEAD(&ci->gadget.ep_list);
2099
2100         /* alloc resources */
2101         ci->qh_pool = dma_pool_create("ci_hw_qh", dev->parent,
2102                                        sizeof(struct ci_hw_qh),
2103                                        64, CI_HDRC_PAGE_SIZE);
2104         if (ci->qh_pool == NULL)
2105                 return -ENOMEM;
2106
2107         ci->td_pool = dma_pool_create("ci_hw_td", dev->parent,
2108                                        sizeof(struct ci_hw_td),
2109                                        64, CI_HDRC_PAGE_SIZE);
2110         if (ci->td_pool == NULL) {
2111                 retval = -ENOMEM;
2112                 goto free_qh_pool;
2113         }
2114
2115         retval = init_eps(ci);
2116         if (retval)
2117                 goto free_pools;
2118
2119         ci->gadget.ep0 = &ci->ep0in->ep;
2120
2121         retval = usb_add_gadget_udc(dev, &ci->gadget);
2122         if (retval)
2123                 goto destroy_eps;
2124
2125         return retval;
2126
2127 destroy_eps:
2128         destroy_eps(ci);
2129 free_pools:
2130         dma_pool_destroy(ci->td_pool);
2131 free_qh_pool:
2132         dma_pool_destroy(ci->qh_pool);
2133         return retval;
2134 }
2135
2136 /*
2137  * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
2138  *
2139  * No interrupts active, the IRQ has been released
2140  */
2141 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
2142 {
2143         if (!ci->roles[CI_ROLE_GADGET])
2144                 return;
2145
2146         usb_del_gadget_udc(&ci->gadget);
2147
2148         destroy_eps(ci);
2149
2150         dma_pool_destroy(ci->td_pool);
2151         dma_pool_destroy(ci->qh_pool);
2152 }
2153
2154 static int udc_id_switch_for_device(struct ci_hdrc *ci)
2155 {
2156         if (ci->platdata->pins_device)
2157                 pinctrl_select_state(ci->platdata->pctl,
2158                                      ci->platdata->pins_device);
2159
2160         if (ci->is_otg)
2161                 /* Clear and enable BSV irq */
2162                 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
2163                                         OTGSC_BSVIS | OTGSC_BSVIE);
2164
2165         return 0;
2166 }
2167
2168 static void udc_id_switch_for_host(struct ci_hdrc *ci)
2169 {
2170         /*
2171          * host doesn't care B_SESSION_VALID event
2172          * so clear and disable BSV irq
2173          */
2174         if (ci->is_otg)
2175                 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
2176
2177         ci->vbus_active = 0;
2178
2179         if (ci->platdata->pins_device && ci->platdata->pins_default)
2180                 pinctrl_select_state(ci->platdata->pctl,
2181                                      ci->platdata->pins_default);
2182 }
2183
2184 /**
2185  * ci_hdrc_gadget_init - initialize device related bits
2186  * @ci: the controller
2187  *
2188  * This function initializes the gadget, if the device is "device capable".
2189  */
2190 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
2191 {
2192         struct ci_role_driver *rdrv;
2193         int ret;
2194
2195         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
2196                 return -ENXIO;
2197
2198         rdrv = devm_kzalloc(ci->dev, sizeof(*rdrv), GFP_KERNEL);
2199         if (!rdrv)
2200                 return -ENOMEM;
2201
2202         rdrv->start     = udc_id_switch_for_device;
2203         rdrv->stop      = udc_id_switch_for_host;
2204         rdrv->irq       = udc_irq;
2205         rdrv->name      = "gadget";
2206
2207         ret = udc_start(ci);
2208         if (!ret)
2209                 ci->roles[CI_ROLE_GADGET] = rdrv;
2210
2211         return ret;
2212 }