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 */
  32static const struct usb_endpoint_descriptor
  33ctrl_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
  42static const struct usb_endpoint_descriptor
  43ctrl_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
  52static 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 */
  61static inline int hw_ep_bit(int num, int dir)
  62{
  63	return num + ((dir == TX) ? 16 : 0);
  64}
  65
  66static 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 */
  83static 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 */
 104static 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 */
 126static 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 */
 142static 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 */
 177static 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 */
 193static 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 */
 224static 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 */
 248static 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 */
 262static 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 */
 275static 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 */
 290static 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 */
 302static 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 */
 315static 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 */
 328static 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
 357static 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 */
 421static inline u8 _usb_addr(struct ci_hw_ep *ep)
 422{
 423	return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
 424}
 425
 426static 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
 467static 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
 488static 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
 507static 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 */
 550static 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);
 637done:
 638	return ret;
 639}
 640
 641/**
 642 * free_pending_td: remove a pending request for the endpoint
 643 * @hwep: endpoint
 644 */
 645static 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
 654static 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 */
 672static 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 */
 751static 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
 790static 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 */
 834static 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 */
 875static void isr_reset_handler(struct ci_hdrc *ci)
 876__releases(ci->lock)
 877__acquires(ci->lock)
 878{
 879	int retval;
 880
 881	spin_unlock(&ci->lock);
 882	if (ci->gadget.speed != USB_SPEED_UNKNOWN)
 883		usb_gadget_udc_reset(&ci->gadget, ci->driver);
 884
 885	retval = _gadget_stop_activity(&ci->gadget);
 886	if (retval)
 887		goto done;
 888
 889	retval = hw_usb_reset(ci);
 890	if (retval)
 891		goto done;
 892
 893	ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
 894	if (ci->status == NULL)
 895		retval = -ENOMEM;
 896
 897done:
 898	spin_lock(&ci->lock);
 899
 900	if (retval)
 901		dev_err(ci->dev, "error: %i\n", retval);
 902}
 903
 904/**
 905 * isr_get_status_complete: get_status request complete function
 906 * @ep:  endpoint
 907 * @req: request handled
 908 *
 909 * Caller must release lock
 910 */
 911static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
 912{
 913	if (ep == NULL || req == NULL)
 914		return;
 915
 916	kfree(req->buf);
 917	usb_ep_free_request(ep, req);
 918}
 919
 920/**
 921 * _ep_queue: queues (submits) an I/O request to an endpoint
 922 * @ep:        endpoint
 923 * @req:       request
 924 * @gfp_flags: GFP flags (not used)
 925 *
 926 * Caller must hold lock
 927 * This function returns an error code
 928 */
 929static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
 930		    gfp_t __maybe_unused gfp_flags)
 931{
 932	struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
 933	struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
 934	struct ci_hdrc *ci = hwep->ci;
 935	int retval = 0;
 936
 937	if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
 938		return -EINVAL;
 939
 940	if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
 941		if (req->length)
 942			hwep = (ci->ep0_dir == RX) ?
 943			       ci->ep0out : ci->ep0in;
 944		if (!list_empty(&hwep->qh.queue)) {
 945			_ep_nuke(hwep);
 946			dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
 947				 _usb_addr(hwep));
 948		}
 949	}
 950
 951	if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
 952	    hwreq->req.length > hwep->ep.mult * hwep->ep.maxpacket) {
 953		dev_err(hwep->ci->dev, "request length too big for isochronous\n");
 954		return -EMSGSIZE;
 955	}
 956
 957	/* first nuke then test link, e.g. previous status has not sent */
 958	if (!list_empty(&hwreq->queue)) {
 959		dev_err(hwep->ci->dev, "request already in queue\n");
 960		return -EBUSY;
 961	}
 962
 963	/* push request */
 964	hwreq->req.status = -EINPROGRESS;
 965	hwreq->req.actual = 0;
 966
 967	retval = _hardware_enqueue(hwep, hwreq);
 968
 969	if (retval == -EALREADY)
 970		retval = 0;
 971	if (!retval)
 972		list_add_tail(&hwreq->queue, &hwep->qh.queue);
 973
 974	return retval;
 975}
 976
 977/**
 978 * isr_get_status_response: get_status request response
 979 * @ci: ci struct
 980 * @setup: setup request packet
 981 *
 982 * This function returns an error code
 983 */
 984static int isr_get_status_response(struct ci_hdrc *ci,
 985				   struct usb_ctrlrequest *setup)
 986__releases(hwep->lock)
 987__acquires(hwep->lock)
 988{
 989	struct ci_hw_ep *hwep = ci->ep0in;
 990	struct usb_request *req = NULL;
 991	gfp_t gfp_flags = GFP_ATOMIC;
 992	int dir, num, retval;
 993
 994	if (hwep == NULL || setup == NULL)
 995		return -EINVAL;
 996
 997	spin_unlock(hwep->lock);
 998	req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
 999	spin_lock(hwep->lock);
1000	if (req == NULL)
1001		return -ENOMEM;
1002
1003	req->complete = isr_get_status_complete;
1004	req->length   = 2;
1005	req->buf      = kzalloc(req->length, gfp_flags);
1006	if (req->buf == NULL) {
1007		retval = -ENOMEM;
1008		goto err_free_req;
1009	}
1010
1011	if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
1012		*(u16 *)req->buf = (ci->remote_wakeup << 1) |
1013			ci->gadget.is_selfpowered;
1014	} else if ((setup->bRequestType & USB_RECIP_MASK) \
1015		   == USB_RECIP_ENDPOINT) {
1016		dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
1017			TX : RX;
1018		num =  le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
1019		*(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
1020	}
1021	/* else do nothing; reserved for future use */
1022
1023	retval = _ep_queue(&hwep->ep, req, gfp_flags);
1024	if (retval)
1025		goto err_free_buf;
1026
1027	return 0;
1028
1029 err_free_buf:
1030	kfree(req->buf);
1031 err_free_req:
1032	spin_unlock(hwep->lock);
1033	usb_ep_free_request(&hwep->ep, req);
1034	spin_lock(hwep->lock);
1035	return retval;
1036}
1037
1038/**
1039 * isr_setup_status_complete: setup_status request complete function
1040 * @ep:  endpoint
1041 * @req: request handled
1042 *
1043 * Caller must release lock. Put the port in test mode if test mode
1044 * feature is selected.
1045 */
1046static void
1047isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
1048{
1049	struct ci_hdrc *ci = req->context;
1050	unsigned long flags;
1051
1052	if (req->status < 0)
1053		return;
1054
1055	if (ci->setaddr) {
1056		hw_usb_set_address(ci, ci->address);
1057		ci->setaddr = false;
1058		if (ci->address)
1059			usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
1060	}
1061
1062	spin_lock_irqsave(&ci->lock, flags);
1063	if (ci->test_mode)
1064		hw_port_test_set(ci, ci->test_mode);
1065	spin_unlock_irqrestore(&ci->lock, flags);
1066}
1067
1068/**
1069 * isr_setup_status_phase: queues the status phase of a setup transation
1070 * @ci: ci struct
1071 *
1072 * This function returns an error code
1073 */
1074static int isr_setup_status_phase(struct ci_hdrc *ci)
1075{
1076	struct ci_hw_ep *hwep;
1077
1078	/*
1079	 * Unexpected USB controller behavior, caused by bad signal integrity
1080	 * or ground reference problems, can lead to isr_setup_status_phase
1081	 * being called with ci->status equal to NULL.
1082	 * If this situation occurs, you should review your USB hardware design.
1083	 */
1084	if (WARN_ON_ONCE(!ci->status))
1085		return -EPIPE;
1086
1087	hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
1088	ci->status->context = ci;
1089	ci->status->complete = isr_setup_status_complete;
1090
1091	return _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
1092}
1093
1094/**
1095 * isr_tr_complete_low: transaction complete low level handler
1096 * @hwep: endpoint
1097 *
1098 * This function returns an error code
1099 * Caller must hold lock
1100 */
1101static int isr_tr_complete_low(struct ci_hw_ep *hwep)
1102__releases(hwep->lock)
1103__acquires(hwep->lock)
1104{
1105	struct ci_hw_req *hwreq, *hwreqtemp;
1106	struct ci_hw_ep *hweptemp = hwep;
1107	int retval = 0;
1108
1109	list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
1110			queue) {
1111		retval = _hardware_dequeue(hwep, hwreq);
1112		if (retval < 0)
1113			break;
1114		list_del_init(&hwreq->queue);
1115		if (hwreq->req.complete != NULL) {
1116			spin_unlock(hwep->lock);
1117			if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
1118					hwreq->req.length)
1119				hweptemp = hwep->ci->ep0in;
1120			usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
1121			spin_lock(hwep->lock);
1122		}
1123	}
1124
1125	if (retval == -EBUSY)
1126		retval = 0;
1127
1128	return retval;
1129}
1130
1131static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
1132{
1133	dev_warn(&ci->gadget.dev,
1134		"connect the device to an alternate port if you want HNP\n");
1135	return isr_setup_status_phase(ci);
1136}
1137
1138/**
1139 * isr_setup_packet_handler: setup packet handler
1140 * @ci: UDC descriptor
1141 *
1142 * This function handles setup packet 
1143 */
1144static void isr_setup_packet_handler(struct ci_hdrc *ci)
1145__releases(ci->lock)
1146__acquires(ci->lock)
1147{
1148	struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1149	struct usb_ctrlrequest req;
1150	int type, num, dir, err = -EINVAL;
1151	u8 tmode = 0;
1152
1153	/*
1154	 * Flush data and handshake transactions of previous
1155	 * setup packet.
1156	 */
1157	_ep_nuke(ci->ep0out);
1158	_ep_nuke(ci->ep0in);
1159
1160	/* read_setup_packet */
1161	do {
1162		hw_test_and_set_setup_guard(ci);
1163		memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1164	} while (!hw_test_and_clear_setup_guard(ci));
1165
1166	type = req.bRequestType;
1167
1168	ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1169
1170	switch (req.bRequest) {
1171	case USB_REQ_CLEAR_FEATURE:
1172		if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1173				le16_to_cpu(req.wValue) ==
1174				USB_ENDPOINT_HALT) {
1175			if (req.wLength != 0)
1176				break;
1177			num  = le16_to_cpu(req.wIndex);
1178			dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1179			num &= USB_ENDPOINT_NUMBER_MASK;
1180			if (dir == TX)
1181				num += ci->hw_ep_max / 2;
1182			if (!ci->ci_hw_ep[num].wedge) {
1183				spin_unlock(&ci->lock);
1184				err = usb_ep_clear_halt(
1185					&ci->ci_hw_ep[num].ep);
1186				spin_lock(&ci->lock);
1187				if (err)
1188					break;
1189			}
1190			err = isr_setup_status_phase(ci);
1191		} else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1192				le16_to_cpu(req.wValue) ==
1193				USB_DEVICE_REMOTE_WAKEUP) {
1194			if (req.wLength != 0)
1195				break;
1196			ci->remote_wakeup = 0;
1197			err = isr_setup_status_phase(ci);
1198		} else {
1199			goto delegate;
1200		}
1201		break;
1202	case USB_REQ_GET_STATUS:
1203		if ((type != (USB_DIR_IN|USB_RECIP_DEVICE) ||
1204			le16_to_cpu(req.wIndex) == OTG_STS_SELECTOR) &&
1205		    type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1206		    type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1207			goto delegate;
1208		if (le16_to_cpu(req.wLength) != 2 ||
1209		    le16_to_cpu(req.wValue)  != 0)
1210			break;
1211		err = isr_get_status_response(ci, &req);
1212		break;
1213	case USB_REQ_SET_ADDRESS:
1214		if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1215			goto delegate;
1216		if (le16_to_cpu(req.wLength) != 0 ||
1217		    le16_to_cpu(req.wIndex)  != 0)
1218			break;
1219		ci->address = (u8)le16_to_cpu(req.wValue);
1220		ci->setaddr = true;
1221		err = isr_setup_status_phase(ci);
1222		break;
1223	case USB_REQ_SET_FEATURE:
1224		if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1225				le16_to_cpu(req.wValue) ==
1226				USB_ENDPOINT_HALT) {
1227			if (req.wLength != 0)
1228				break;
1229			num  = le16_to_cpu(req.wIndex);
1230			dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1231			num &= USB_ENDPOINT_NUMBER_MASK;
1232			if (dir == TX)
1233				num += ci->hw_ep_max / 2;
1234
1235			spin_unlock(&ci->lock);
1236			err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1237			spin_lock(&ci->lock);
1238			if (!err)
1239				isr_setup_status_phase(ci);
1240		} else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1241			if (req.wLength != 0)
1242				break;
1243			switch (le16_to_cpu(req.wValue)) {
1244			case USB_DEVICE_REMOTE_WAKEUP:
1245				ci->remote_wakeup = 1;
1246				err = isr_setup_status_phase(ci);
1247				break;
1248			case USB_DEVICE_TEST_MODE:
1249				tmode = le16_to_cpu(req.wIndex) >> 8;
1250				switch (tmode) {
1251				case USB_TEST_J:
1252				case USB_TEST_K:
1253				case USB_TEST_SE0_NAK:
1254				case USB_TEST_PACKET:
1255				case USB_TEST_FORCE_ENABLE:
1256					ci->test_mode = tmode;
1257					err = isr_setup_status_phase(
1258							ci);
1259					break;
1260				default:
1261					break;
1262				}
1263				break;
1264			case USB_DEVICE_B_HNP_ENABLE:
1265				if (ci_otg_is_fsm_mode(ci)) {
1266					ci->gadget.b_hnp_enable = 1;
1267					err = isr_setup_status_phase(
1268							ci);
1269				}
1270				break;
1271			case USB_DEVICE_A_ALT_HNP_SUPPORT:
1272				if (ci_otg_is_fsm_mode(ci))
1273					err = otg_a_alt_hnp_support(ci);
1274				break;
1275			case USB_DEVICE_A_HNP_SUPPORT:
1276				if (ci_otg_is_fsm_mode(ci)) {
1277					ci->gadget.a_hnp_support = 1;
1278					err = isr_setup_status_phase(
1279							ci);
1280				}
1281				break;
1282			default:
1283				goto delegate;
1284			}
1285		} else {
1286			goto delegate;
1287		}
1288		break;
1289	default:
1290delegate:
1291		if (req.wLength == 0)   /* no data phase */
1292			ci->ep0_dir = TX;
1293
1294		spin_unlock(&ci->lock);
1295		err = ci->driver->setup(&ci->gadget, &req);
1296		spin_lock(&ci->lock);
1297		break;
1298	}
1299
1300	if (err < 0) {
1301		spin_unlock(&ci->lock);
1302		if (_ep_set_halt(&hwep->ep, 1, false))
1303			dev_err(ci->dev, "error: _ep_set_halt\n");
1304		spin_lock(&ci->lock);
1305	}
1306}
1307
1308/**
1309 * isr_tr_complete_handler: transaction complete interrupt handler
1310 * @ci: UDC descriptor
1311 *
1312 * This function handles traffic events
1313 */
1314static void isr_tr_complete_handler(struct ci_hdrc *ci)
1315__releases(ci->lock)
1316__acquires(ci->lock)
1317{
1318	unsigned i;
1319	int err;
1320
1321	for (i = 0; i < ci->hw_ep_max; i++) {
1322		struct ci_hw_ep *hwep  = &ci->ci_hw_ep[i];
1323
1324		if (hwep->ep.desc == NULL)
1325			continue;   /* not configured */
1326
1327		if (hw_test_and_clear_complete(ci, i)) {
1328			err = isr_tr_complete_low(hwep);
1329			if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1330				if (err > 0)   /* needs status phase */
1331					err = isr_setup_status_phase(ci);
1332				if (err < 0) {
1333					spin_unlock(&ci->lock);
1334					if (_ep_set_halt(&hwep->ep, 1, false))
1335						dev_err(ci->dev,
1336						"error: _ep_set_halt\n");
1337					spin_lock(&ci->lock);
1338				}
1339			}
1340		}
1341
1342		/* Only handle setup packet below */
1343		if (i == 0 &&
1344			hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1345			isr_setup_packet_handler(ci);
1346	}
1347}
1348
1349/******************************************************************************
1350 * ENDPT block
1351 *****************************************************************************/
1352/*
1353 * ep_enable: configure endpoint, making it usable
1354 *
1355 * Check usb_ep_enable() at "usb_gadget.h" for details
1356 */
1357static int ep_enable(struct usb_ep *ep,
1358		     const struct usb_endpoint_descriptor *desc)
1359{
1360	struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1361	int retval = 0;
1362	unsigned long flags;
1363	u32 cap = 0;
1364
1365	if (ep == NULL || desc == NULL)
1366		return -EINVAL;
1367
1368	spin_lock_irqsave(hwep->lock, flags);
1369
1370	/* only internal SW should enable ctrl endpts */
1371
1372	if (!list_empty(&hwep->qh.queue)) {
1373		dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1374		spin_unlock_irqrestore(hwep->lock, flags);
1375		return -EBUSY;
1376	}
1377
1378	hwep->ep.desc = desc;
1379
1380	hwep->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
1381	hwep->num  = usb_endpoint_num(desc);
1382	hwep->type = usb_endpoint_type(desc);
1383
1384	hwep->ep.maxpacket = usb_endpoint_maxp(desc);
1385	hwep->ep.mult = usb_endpoint_maxp_mult(desc);
1386
1387	if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1388		cap |= QH_IOS;
1389
1390	cap |= QH_ZLT;
1391	cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1392	/*
1393	 * For ISO-TX, we set mult at QH as the largest value, and use
1394	 * MultO at TD as real mult value.
1395	 */
1396	if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1397		cap |= 3 << __ffs(QH_MULT);
1398
1399	hwep->qh.ptr->cap = cpu_to_le32(cap);
1400
1401	hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE);   /* needed? */
1402
1403	if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1404		dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1405		retval = -EINVAL;
1406	}
1407
1408	/*
1409	 * Enable endpoints in the HW other than ep0 as ep0
1410	 * is always enabled
1411	 */
1412	if (hwep->num)
1413		retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1414				       hwep->type);
1415
1416	spin_unlock_irqrestore(hwep->lock, flags);
1417	return retval;
1418}
1419
1420/*
1421 * ep_disable: endpoint is no longer usable
1422 *
1423 * Check usb_ep_disable() at "usb_gadget.h" for details
1424 */
1425static int ep_disable(struct usb_ep *ep)
1426{
1427	struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1428	int direction, retval = 0;
1429	unsigned long flags;
1430
1431	if (ep == NULL)
1432		return -EINVAL;
1433	else if (hwep->ep.desc == NULL)
1434		return -EBUSY;
1435
1436	spin_lock_irqsave(hwep->lock, flags);
1437	if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1438		spin_unlock_irqrestore(hwep->lock, flags);
1439		return 0;
1440	}
1441
1442	/* only internal SW should disable ctrl endpts */
1443
1444	direction = hwep->dir;
1445	do {
1446		retval |= _ep_nuke(hwep);
1447		retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1448
1449		if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1450			hwep->dir = (hwep->dir == TX) ? RX : TX;
1451
1452	} while (hwep->dir != direction);
1453
1454	hwep->ep.desc = NULL;
1455
1456	spin_unlock_irqrestore(hwep->lock, flags);
1457	return retval;
1458}
1459
1460/*
1461 * ep_alloc_request: allocate a request object to use with this endpoint
1462 *
1463 * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1464 */
1465static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1466{
1467	struct ci_hw_req *hwreq;
1468
1469	if (ep == NULL)
1470		return NULL;
1471
1472	hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1473	if (hwreq != NULL) {
1474		INIT_LIST_HEAD(&hwreq->queue);
1475		INIT_LIST_HEAD(&hwreq->tds);
1476	}
1477
1478	return (hwreq == NULL) ? NULL : &hwreq->req;
1479}
1480
1481/*
1482 * ep_free_request: frees a request object
1483 *
1484 * Check usb_ep_free_request() at "usb_gadget.h" for details
1485 */
1486static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1487{
1488	struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1489	struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1490	struct td_node *node, *tmpnode;
1491	unsigned long flags;
1492
1493	if (ep == NULL || req == NULL) {
1494		return;
1495	} else if (!list_empty(&hwreq->queue)) {
1496		dev_err(hwep->ci->dev, "freeing queued request\n");
1497		return;
1498	}
1499
1500	spin_lock_irqsave(hwep->lock, flags);
1501
1502	list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1503		dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1504		list_del_init(&node->td);
1505		node->ptr = NULL;
1506		kfree(node);
1507	}
1508
1509	kfree(hwreq);
1510
1511	spin_unlock_irqrestore(hwep->lock, flags);
1512}
1513
1514/*
1515 * ep_queue: queues (submits) an I/O request to an endpoint
1516 *
1517 * Check usb_ep_queue()* at usb_gadget.h" for details
1518 */
1519static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1520		    gfp_t __maybe_unused gfp_flags)
1521{
1522	struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1523	int retval = 0;
1524	unsigned long flags;
1525
1526	if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1527		return -EINVAL;
1528
1529	spin_lock_irqsave(hwep->lock, flags);
1530	if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1531		spin_unlock_irqrestore(hwep->lock, flags);
1532		return 0;
1533	}
1534	retval = _ep_queue(ep, req, gfp_flags);
1535	spin_unlock_irqrestore(hwep->lock, flags);
1536	return retval;
1537}
1538
1539/*
1540 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1541 *
1542 * Check usb_ep_dequeue() at "usb_gadget.h" for details
1543 */
1544static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1545{
1546	struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1547	struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1548	unsigned long flags;
1549	struct td_node *node, *tmpnode;
1550
1551	if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1552		hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1553		list_empty(&hwep->qh.queue))
1554		return -EINVAL;
1555
1556	spin_lock_irqsave(hwep->lock, flags);
1557	if (hwep->ci->gadget.speed != USB_SPEED_UNKNOWN)
1558		hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1559
1560	list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1561		dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1562		list_del(&node->td);
1563		kfree(node);
1564	}
1565
1566	/* pop request */
1567	list_del_init(&hwreq->queue);
1568
1569	usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1570
1571	req->status = -ECONNRESET;
1572
1573	if (hwreq->req.complete != NULL) {
1574		spin_unlock(hwep->lock);
1575		usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1576		spin_lock(hwep->lock);
1577	}
1578
1579	spin_unlock_irqrestore(hwep->lock, flags);
1580	return 0;
1581}
1582
1583/*
1584 * ep_set_halt: sets the endpoint halt feature
1585 *
1586 * Check usb_ep_set_halt() at "usb_gadget.h" for details
1587 */
1588static int ep_set_halt(struct usb_ep *ep, int value)
1589{
1590	return _ep_set_halt(ep, value, true);
1591}
1592
1593/*
1594 * ep_set_wedge: sets the halt feature and ignores clear requests
1595 *
1596 * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1597 */
1598static int ep_set_wedge(struct usb_ep *ep)
1599{
1600	struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1601	unsigned long flags;
1602
1603	if (ep == NULL || hwep->ep.desc == NULL)
1604		return -EINVAL;
1605
1606	spin_lock_irqsave(hwep->lock, flags);
1607	hwep->wedge = 1;
1608	spin_unlock_irqrestore(hwep->lock, flags);
1609
1610	return usb_ep_set_halt(ep);
1611}
1612
1613/*
1614 * ep_fifo_flush: flushes contents of a fifo
1615 *
1616 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1617 */
1618static void ep_fifo_flush(struct usb_ep *ep)
1619{
1620	struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1621	unsigned long flags;
1622
1623	if (ep == NULL) {
1624		dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1625		return;
1626	}
1627
1628	spin_lock_irqsave(hwep->lock, flags);
1629	if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1630		spin_unlock_irqrestore(hwep->lock, flags);
1631		return;
1632	}
1633
1634	hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1635
1636	spin_unlock_irqrestore(hwep->lock, flags);
1637}
1638
1639/*
1640 * Endpoint-specific part of the API to the USB controller hardware
1641 * Check "usb_gadget.h" for details
1642 */
1643static const struct usb_ep_ops usb_ep_ops = {
1644	.enable	       = ep_enable,
1645	.disable       = ep_disable,
1646	.alloc_request = ep_alloc_request,
1647	.free_request  = ep_free_request,
1648	.queue	       = ep_queue,
1649	.dequeue       = ep_dequeue,
1650	.set_halt      = ep_set_halt,
1651	.set_wedge     = ep_set_wedge,
1652	.fifo_flush    = ep_fifo_flush,
1653};
1654
1655/******************************************************************************
1656 * GADGET block
1657 *****************************************************************************/
1658
1659static int ci_udc_get_frame(struct usb_gadget *_gadget)
1660{
1661	struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1662	unsigned long flags;
1663	int ret;
1664
1665	spin_lock_irqsave(&ci->lock, flags);
1666	ret = hw_read(ci, OP_FRINDEX, 0x3fff);
1667	spin_unlock_irqrestore(&ci->lock, flags);
1668	return ret >> 3;
1669}
1670
1671/*
1672 * ci_hdrc_gadget_connect: caller makes sure gadget driver is binded
1673 */
1674static void ci_hdrc_gadget_connect(struct usb_gadget *_gadget, int is_active)
1675{
1676	struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1677
1678	if (is_active) {
1679		pm_runtime_get_sync(ci->dev);
1680		hw_device_reset(ci);
1681		spin_lock_irq(&ci->lock);
1682		if (ci->driver) {
1683			hw_device_state(ci, ci->ep0out->qh.dma);
1684			usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1685			spin_unlock_irq(&ci->lock);
1686			usb_udc_vbus_handler(_gadget, true);
1687		} else {
1688			spin_unlock_irq(&ci->lock);
1689		}
1690	} else {
1691		usb_udc_vbus_handler(_gadget, false);
1692		if (ci->driver)
1693			ci->driver->disconnect(&ci->gadget);
1694		hw_device_state(ci, 0);
1695		if (ci->platdata->notify_event)
1696			ci->platdata->notify_event(ci,
1697			CI_HDRC_CONTROLLER_STOPPED_EVENT);
1698		_gadget_stop_activity(&ci->gadget);
1699		pm_runtime_put_sync(ci->dev);
1700		usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1701	}
1702}
1703
1704static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1705{
1706	struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1707	unsigned long flags;
1708	int ret = 0;
1709
1710	spin_lock_irqsave(&ci->lock, flags);
1711	ci->vbus_active = is_active;
1712	spin_unlock_irqrestore(&ci->lock, flags);
1713
1714	if (ci->usb_phy)
1715		usb_phy_set_charger_state(ci->usb_phy, is_active ?
1716			USB_CHARGER_PRESENT : USB_CHARGER_ABSENT);
1717
1718	if (ci->platdata->notify_event)
1719		ret = ci->platdata->notify_event(ci,
1720				CI_HDRC_CONTROLLER_VBUS_EVENT);
1721
1722	if (ci->usb_phy) {
1723		if (is_active)
1724			usb_phy_set_event(ci->usb_phy, USB_EVENT_VBUS);
1725		else
1726			usb_phy_set_event(ci->usb_phy, USB_EVENT_NONE);
1727	}
1728
1729	if (ci->driver)
1730		ci_hdrc_gadget_connect(_gadget, is_active);
1731
1732	return ret;
1733}
1734
1735static int ci_udc_wakeup(struct usb_gadget *_gadget)
1736{
1737	struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1738	unsigned long flags;
1739	int ret = 0;
1740
1741	spin_lock_irqsave(&ci->lock, flags);
1742	if (ci->gadget.speed == USB_SPEED_UNKNOWN) {
1743		spin_unlock_irqrestore(&ci->lock, flags);
1744		return 0;
1745	}
1746	if (!ci->remote_wakeup) {
1747		ret = -EOPNOTSUPP;
1748		goto out;
1749	}
1750	if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1751		ret = -EINVAL;
1752		goto out;
1753	}
1754	hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1755out:
1756	spin_unlock_irqrestore(&ci->lock, flags);
1757	return ret;
1758}
1759
1760static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1761{
1762	struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1763
1764	if (ci->usb_phy)
1765		return usb_phy_set_power(ci->usb_phy, ma);
1766	return -ENOTSUPP;
1767}
1768
1769static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1770{
1771	struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1772	struct ci_hw_ep *hwep = ci->ep0in;
1773	unsigned long flags;
1774
1775	spin_lock_irqsave(hwep->lock, flags);
1776	_gadget->is_selfpowered = (is_on != 0);
1777	spin_unlock_irqrestore(hwep->lock, flags);
1778
1779	return 0;
1780}
1781
1782/* Change Data+ pullup status
1783 * this func is used by usb_gadget_connect/disconnect
1784 */
1785static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1786{
1787	struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1788
1789	/*
1790	 * Data+ pullup controlled by OTG state machine in OTG fsm mode;
1791	 * and don't touch Data+ in host mode for dual role config.
1792	 */
1793	if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST)
1794		return 0;
1795
1796	pm_runtime_get_sync(ci->dev);
1797	if (is_on)
1798		hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1799	else
1800		hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1801	pm_runtime_put_sync(ci->dev);
1802
1803	return 0;
1804}
1805
1806static int ci_udc_start(struct usb_gadget *gadget,
1807			 struct usb_gadget_driver *driver);
1808static int ci_udc_stop(struct usb_gadget *gadget);
1809
1810/* Match ISOC IN from the highest endpoint */
1811static struct usb_ep *ci_udc_match_ep(struct usb_gadget *gadget,
1812			      struct usb_endpoint_descriptor *desc,
1813			      struct usb_ss_ep_comp_descriptor *comp_desc)
1814{
1815	struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1816	struct usb_ep *ep;
1817
1818	if (usb_endpoint_xfer_isoc(desc) && usb_endpoint_dir_in(desc)) {
1819		list_for_each_entry_reverse(ep, &ci->gadget.ep_list, ep_list) {
1820			if (ep->caps.dir_in && !ep->claimed)
1821				return ep;
1822		}
1823	}
1824
1825	return NULL;
1826}
1827
1828/*
1829 * Device operations part of the API to the USB controller hardware,
1830 * which don't involve endpoints (or i/o)
1831 * Check  "usb_gadget.h" for details
1832 */
1833static const struct usb_gadget_ops usb_gadget_ops = {
1834	.get_frame	= ci_udc_get_frame,
1835	.vbus_session	= ci_udc_vbus_session,
1836	.wakeup		= ci_udc_wakeup,
1837	.set_selfpowered	= ci_udc_selfpowered,
1838	.pullup		= ci_udc_pullup,
1839	.vbus_draw	= ci_udc_vbus_draw,
1840	.udc_start	= ci_udc_start,
1841	.udc_stop	= ci_udc_stop,
1842	.match_ep 	= ci_udc_match_ep,
1843};
1844
1845static int init_eps(struct ci_hdrc *ci)
1846{
1847	int retval = 0, i, j;
1848
1849	for (i = 0; i < ci->hw_ep_max/2; i++)
1850		for (j = RX; j <= TX; j++) {
1851			int k = i + j * ci->hw_ep_max/2;
1852			struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1853
1854			scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1855					(j == TX)  ? "in" : "out");
1856
1857			hwep->ci          = ci;
1858			hwep->lock         = &ci->lock;
1859			hwep->td_pool      = ci->td_pool;
1860
1861			hwep->ep.name      = hwep->name;
1862			hwep->ep.ops       = &usb_ep_ops;
1863
1864			if (i == 0) {
1865				hwep->ep.caps.type_control = true;
1866			} else {
1867				hwep->ep.caps.type_iso = true;
1868				hwep->ep.caps.type_bulk = true;
1869				hwep->ep.caps.type_int = true;
1870			}
1871
1872			if (j == TX)
1873				hwep->ep.caps.dir_in = true;
1874			else
1875				hwep->ep.caps.dir_out = true;
1876
1877			/*
1878			 * for ep0: maxP defined in desc, for other
1879			 * eps, maxP is set by epautoconfig() called
1880			 * by gadget layer
1881			 */
1882			usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1883
1884			INIT_LIST_HEAD(&hwep->qh.queue);
1885			hwep->qh.ptr = dma_pool_zalloc(ci->qh_pool, GFP_KERNEL,
1886						       &hwep->qh.dma);
1887			if (hwep->qh.ptr == NULL)
1888				retval = -ENOMEM;
1889
1890			/*
1891			 * set up shorthands for ep0 out and in endpoints,
1892			 * don't add to gadget's ep_list
1893			 */
1894			if (i == 0) {
1895				if (j == RX)
1896					ci->ep0out = hwep;
1897				else
1898					ci->ep0in = hwep;
1899
1900				usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1901				continue;
1902			}
1903
1904			list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1905		}
1906
1907	return retval;
1908}
1909
1910static void destroy_eps(struct ci_hdrc *ci)
1911{
1912	int i;
1913
1914	for (i = 0; i < ci->hw_ep_max; i++) {
1915		struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1916
1917		if (hwep->pending_td)
1918			free_pending_td(hwep);
1919		dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1920	}
1921}
1922
1923/**
1924 * ci_udc_start: register a gadget driver
1925 * @gadget: our gadget
1926 * @driver: the driver being registered
1927 *
1928 * Interrupts are enabled here.
1929 */
1930static int ci_udc_start(struct usb_gadget *gadget,
1931			 struct usb_gadget_driver *driver)
1932{
1933	struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1934	int retval;
1935
1936	if (driver->disconnect == NULL)
1937		return -EINVAL;
1938
1939	ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1940	retval = usb_ep_enable(&ci->ep0out->ep);
1941	if (retval)
1942		return retval;
1943
1944	ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1945	retval = usb_ep_enable(&ci->ep0in->ep);
1946	if (retval)
1947		return retval;
1948
1949	ci->driver = driver;
1950
1951	/* Start otg fsm for B-device */
1952	if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1953		ci_hdrc_otg_fsm_start(ci);
1954		return retval;
1955	}
1956
1957	if (ci->vbus_active)
1958		ci_hdrc_gadget_connect(gadget, 1);
1959	else
1960		usb_udc_vbus_handler(&ci->gadget, false);
1961
1962	return retval;
1963}
1964
1965static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
1966{
1967	if (!ci_otg_is_fsm_mode(ci))
1968		return;
1969
1970	mutex_lock(&ci->fsm.lock);
1971	if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
1972		ci->fsm.a_bidl_adis_tmout = 1;
1973		ci_hdrc_otg_fsm_start(ci);
1974	} else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
1975		ci->fsm.protocol = PROTO_UNDEF;
1976		ci->fsm.otg->state = OTG_STATE_UNDEFINED;
1977	}
1978	mutex_unlock(&ci->fsm.lock);
1979}
1980
1981/*
1982 * ci_udc_stop: unregister a gadget driver
1983 */
1984static int ci_udc_stop(struct usb_gadget *gadget)
1985{
1986	struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1987	unsigned long flags;
1988
1989	spin_lock_irqsave(&ci->lock, flags);
1990	ci->driver = NULL;
1991
1992	if (ci->vbus_active) {
1993		hw_device_state(ci, 0);
1994		spin_unlock_irqrestore(&ci->lock, flags);
1995		if (ci->platdata->notify_event)
1996			ci->platdata->notify_event(ci,
1997			CI_HDRC_CONTROLLER_STOPPED_EVENT);
1998		_gadget_stop_activity(&ci->gadget);
1999		spin_lock_irqsave(&ci->lock, flags);
2000		pm_runtime_put(ci->dev);
2001	}
2002
2003	spin_unlock_irqrestore(&ci->lock, flags);
2004
2005	ci_udc_stop_for_otg_fsm(ci);
2006	return 0;
2007}
2008
2009/******************************************************************************
2010 * BUS block
2011 *****************************************************************************/
2012/*
2013 * udc_irq: ci interrupt handler
2014 *
2015 * This function returns IRQ_HANDLED if the IRQ has been handled
2016 * It locks access to registers
2017 */
2018static irqreturn_t udc_irq(struct ci_hdrc *ci)
2019{
2020	irqreturn_t retval;
2021	u32 intr;
2022
2023	if (ci == NULL)
2024		return IRQ_HANDLED;
2025
2026	spin_lock(&ci->lock);
2027
2028	if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
2029		if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
2030				USBMODE_CM_DC) {
2031			spin_unlock(&ci->lock);
2032			return IRQ_NONE;
2033		}
2034	}
2035	intr = hw_test_and_clear_intr_active(ci);
2036
2037	if (intr) {
2038		/* order defines priority - do NOT change it */
2039		if (USBi_URI & intr)
2040			isr_reset_handler(ci);
2041
2042		if (USBi_PCI & intr) {
2043			ci->gadget.speed = hw_port_is_high_speed(ci) ?
2044				USB_SPEED_HIGH : USB_SPEED_FULL;
2045			if (ci->usb_phy)
2046				usb_phy_set_event(ci->usb_phy,
2047					USB_EVENT_ENUMERATED);
2048			if (ci->suspended) {
2049				if (ci->driver->resume) {
2050					spin_unlock(&ci->lock);
2051					ci->driver->resume(&ci->gadget);
2052					spin_lock(&ci->lock);
2053				}
2054				ci->suspended = 0;
2055				usb_gadget_set_state(&ci->gadget,
2056						ci->resume_state);
2057			}
2058		}
2059
2060		if (USBi_UI  & intr)
2061			isr_tr_complete_handler(ci);
2062
2063		if ((USBi_SLI & intr) && !(ci->suspended)) {
2064			ci->suspended = 1;
2065			ci->resume_state = ci->gadget.state;
2066			if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
2067			    ci->driver->suspend) {
2068				spin_unlock(&ci->lock);
2069				ci->driver->suspend(&ci->gadget);
2070				spin_lock(&ci->lock);
2071			}
2072			usb_gadget_set_state(&ci->gadget,
2073					USB_STATE_SUSPENDED);
2074		}
2075		retval = IRQ_HANDLED;
2076	} else {
2077		retval = IRQ_NONE;
2078	}
2079	spin_unlock(&ci->lock);
2080
2081	return retval;
2082}
2083
2084/**
2085 * udc_start: initialize gadget role
2086 * @ci: chipidea controller
2087 */
2088static int udc_start(struct ci_hdrc *ci)
2089{
2090	struct device *dev = ci->dev;
2091	struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
2092	int retval = 0;
2093
2094	ci->gadget.ops          = &usb_gadget_ops;
2095	ci->gadget.speed        = USB_SPEED_UNKNOWN;
2096	ci->gadget.max_speed    = USB_SPEED_HIGH;
2097	ci->gadget.name         = ci->platdata->name;
2098	ci->gadget.otg_caps	= otg_caps;
2099	ci->gadget.sg_supported = 1;
2100	ci->gadget.irq		= ci->irq;
2101
2102	if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA)
2103		ci->gadget.quirk_avoids_skb_reserve = 1;
2104
2105	if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
2106						otg_caps->adp_support))
2107		ci->gadget.is_otg = 1;
2108
2109	INIT_LIST_HEAD(&ci->gadget.ep_list);
2110
2111	/* alloc resources */
2112	ci->qh_pool = dma_pool_create("ci_hw_qh", dev->parent,
2113				       sizeof(struct ci_hw_qh),
2114				       64, CI_HDRC_PAGE_SIZE);
2115	if (ci->qh_pool == NULL)
2116		return -ENOMEM;
2117
2118	ci->td_pool = dma_pool_create("ci_hw_td", dev->parent,
2119				       sizeof(struct ci_hw_td),
2120				       64, CI_HDRC_PAGE_SIZE);
2121	if (ci->td_pool == NULL) {
2122		retval = -ENOMEM;
2123		goto free_qh_pool;
2124	}
2125
2126	retval = init_eps(ci);
2127	if (retval)
2128		goto free_pools;
2129
2130	ci->gadget.ep0 = &ci->ep0in->ep;
2131
2132	retval = usb_add_gadget_udc(dev, &ci->gadget);
2133	if (retval)
2134		goto destroy_eps;
2135
2136	return retval;
2137
2138destroy_eps:
2139	destroy_eps(ci);
2140free_pools:
2141	dma_pool_destroy(ci->td_pool);
2142free_qh_pool:
2143	dma_pool_destroy(ci->qh_pool);
2144	return retval;
2145}
2146
2147/*
2148 * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
2149 *
2150 * No interrupts active, the IRQ has been released
2151 */
2152void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
2153{
2154	if (!ci->roles[CI_ROLE_GADGET])
2155		return;
2156
2157	usb_del_gadget_udc(&ci->gadget);
2158
2159	destroy_eps(ci);
2160
2161	dma_pool_destroy(ci->td_pool);
2162	dma_pool_destroy(ci->qh_pool);
2163}
2164
2165static int udc_id_switch_for_device(struct ci_hdrc *ci)
2166{
2167	if (ci->platdata->pins_device)
2168		pinctrl_select_state(ci->platdata->pctl,
2169				     ci->platdata->pins_device);
2170
2171	if (ci->is_otg)
2172		/* Clear and enable BSV irq */
2173		hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
2174					OTGSC_BSVIS | OTGSC_BSVIE);
2175
2176	return 0;
2177}
2178
2179static void udc_id_switch_for_host(struct ci_hdrc *ci)
2180{
2181	/*
2182	 * host doesn't care B_SESSION_VALID event
2183	 * so clear and disable BSV irq
2184	 */
2185	if (ci->is_otg)
2186		hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
2187
2188	ci->vbus_active = 0;
2189
2190	if (ci->platdata->pins_device && ci->platdata->pins_default)
2191		pinctrl_select_state(ci->platdata->pctl,
2192				     ci->platdata->pins_default);
2193}
2194
2195#ifdef CONFIG_PM_SLEEP
2196static void udc_suspend(struct ci_hdrc *ci)
2197{
2198	/*
2199	 * Set OP_ENDPTLISTADDR to be non-zero for
2200	 * checking if controller resume from power lost
2201	 * in non-host mode.
2202	 */
2203	if (hw_read(ci, OP_ENDPTLISTADDR, ~0) == 0)
2204		hw_write(ci, OP_ENDPTLISTADDR, ~0, ~0);
2205}
2206
2207static void udc_resume(struct ci_hdrc *ci, bool power_lost)
2208{
2209	if (power_lost) {
2210		if (ci->is_otg)
2211			hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
2212					OTGSC_BSVIS | OTGSC_BSVIE);
2213		if (ci->vbus_active)
2214			usb_gadget_vbus_disconnect(&ci->gadget);
2215	}
2216
2217	/* Restore value 0 if it was set for power lost check */
2218	if (hw_read(ci, OP_ENDPTLISTADDR, ~0) == 0xFFFFFFFF)
2219		hw_write(ci, OP_ENDPTLISTADDR, ~0, 0);
2220}
2221#endif
2222
2223/**
2224 * ci_hdrc_gadget_init - initialize device related bits
2225 * @ci: the controller
2226 *
2227 * This function initializes the gadget, if the device is "device capable".
2228 */
2229int ci_hdrc_gadget_init(struct ci_hdrc *ci)
2230{
2231	struct ci_role_driver *rdrv;
2232	int ret;
2233
2234	if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
2235		return -ENXIO;
2236
2237	rdrv = devm_kzalloc(ci->dev, sizeof(*rdrv), GFP_KERNEL);
2238	if (!rdrv)
2239		return -ENOMEM;
2240
2241	rdrv->start	= udc_id_switch_for_device;
2242	rdrv->stop	= udc_id_switch_for_host;
2243#ifdef CONFIG_PM_SLEEP
2244	rdrv->suspend	= udc_suspend;
2245	rdrv->resume	= udc_resume;
2246#endif
2247	rdrv->irq	= udc_irq;
2248	rdrv->name	= "gadget";
2249
2250	ret = udc_start(ci);
2251	if (!ret)
2252		ci->roles[CI_ROLE_GADGET] = rdrv;
2253
2254	return ret;
2255}