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				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 */
 750static 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
 789static 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 */
 833static 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 */
 874static 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
 896done:
 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 */
 910static 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 */
 928static 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 */
 983static 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 */
1045static void
1046isr_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 */
1073static 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 */
1100static 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
1130static 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 */
1143static 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:
1289delegate:
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 */
1313static 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 */
1356static 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 */
1424static 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 */
1464static 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 */
1485static 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 */
1518static 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 */
1543static 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 */
1587static 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 */
1597static 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 */
1617static 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 */
1642static 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
1658static 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 */
1673static 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
1703static 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
1727static 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);
1747out:
1748	spin_unlock_irqrestore(&ci->lock, flags);
1749	return ret;
1750}
1751
1752static 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
1761static 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 */
1777static 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
1798static int ci_udc_start(struct usb_gadget *gadget,
1799			 struct usb_gadget_driver *driver);
1800static int ci_udc_stop(struct usb_gadget *gadget);
1801
1802/* Match ISOC IN from the highest endpoint */
1803static 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 */
1825static 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
1837static 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
1902static 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 */
1922static 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
1957static 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 */
1976static 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 */
2010static 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 */
2077static 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
2127destroy_eps:
2128	destroy_eps(ci);
2129free_pools:
2130	dma_pool_destroy(ci->td_pool);
2131free_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 */
2141void 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
2154static 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
2168static 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#ifdef CONFIG_PM_SLEEP
2185static void udc_suspend(struct ci_hdrc *ci)
2186{
2187	/*
2188	 * Set OP_ENDPTLISTADDR to be non-zero for
2189	 * checking if controller resume from power lost
2190	 * in non-host mode.
2191	 */
2192	if (hw_read(ci, OP_ENDPTLISTADDR, ~0) == 0)
2193		hw_write(ci, OP_ENDPTLISTADDR, ~0, ~0);
2194}
2195
2196static void udc_resume(struct ci_hdrc *ci, bool power_lost)
2197{
2198	if (power_lost) {
2199		if (ci->is_otg)
2200			hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
2201					OTGSC_BSVIS | OTGSC_BSVIE);
2202		if (ci->vbus_active)
2203			usb_gadget_vbus_disconnect(&ci->gadget);
2204	}
2205
2206	/* Restore value 0 if it was set for power lost check */
2207	if (hw_read(ci, OP_ENDPTLISTADDR, ~0) == 0xFFFFFFFF)
2208		hw_write(ci, OP_ENDPTLISTADDR, ~0, 0);
2209}
2210#endif
2211
2212/**
2213 * ci_hdrc_gadget_init - initialize device related bits
2214 * @ci: the controller
2215 *
2216 * This function initializes the gadget, if the device is "device capable".
2217 */
2218int ci_hdrc_gadget_init(struct ci_hdrc *ci)
2219{
2220	struct ci_role_driver *rdrv;
2221	int ret;
2222
2223	if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
2224		return -ENXIO;
2225
2226	rdrv = devm_kzalloc(ci->dev, sizeof(*rdrv), GFP_KERNEL);
2227	if (!rdrv)
2228		return -ENOMEM;
2229
2230	rdrv->start	= udc_id_switch_for_device;
2231	rdrv->stop	= udc_id_switch_for_host;
2232#ifdef CONFIG_PM_SLEEP
2233	rdrv->suspend	= udc_suspend;
2234	rdrv->resume	= udc_resume;
2235#endif
2236	rdrv->irq	= udc_irq;
2237	rdrv->name	= "gadget";
2238
2239	ret = udc_start(ci);
2240	if (!ret)
2241		ci->roles[CI_ROLE_GADGET] = rdrv;
2242
2243	return ret;
2244}