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