1 // SPDX-License-Identifier: GPL-2.0
3 * udc.c - ChipIdea UDC driver
5 * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
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/usb/ch9.h>
19 #include <linux/usb/gadget.h>
20 #include <linux/usb/otg-fsm.h>
21 #include <linux/usb/chipidea.h>
29 /* control endpoint description */
30 static const struct usb_endpoint_descriptor
31 ctrl_endpt_out_desc = {
32 .bLength = USB_DT_ENDPOINT_SIZE,
33 .bDescriptorType = USB_DT_ENDPOINT,
35 .bEndpointAddress = USB_DIR_OUT,
36 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
37 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
40 static const struct usb_endpoint_descriptor
41 ctrl_endpt_in_desc = {
42 .bLength = USB_DT_ENDPOINT_SIZE,
43 .bDescriptorType = USB_DT_ENDPOINT,
45 .bEndpointAddress = USB_DIR_IN,
46 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
47 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
51 * hw_ep_bit: calculates the bit number
52 * @num: endpoint number
53 * @dir: endpoint direction
55 * This function returns bit number
57 static inline int hw_ep_bit(int num, int dir)
59 return num + ((dir == TX) ? 16 : 0);
62 static inline int ep_to_bit(struct ci_hdrc *ci, int n)
64 int fill = 16 - ci->hw_ep_max / 2;
66 if (n >= ci->hw_ep_max / 2)
73 * hw_device_state: enables/disables interrupts (execute without interruption)
74 * @dma: 0 => disable, !0 => enable and set dma engine
76 * This function returns an error code
78 static int hw_device_state(struct ci_hdrc *ci, u32 dma)
81 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
82 /* interrupt, error, port change, reset, sleep/suspend */
83 hw_write(ci, OP_USBINTR, ~0,
84 USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
86 hw_write(ci, OP_USBINTR, ~0, 0);
92 * hw_ep_flush: flush endpoint fifo (execute without interruption)
93 * @num: endpoint number
94 * @dir: endpoint direction
96 * This function returns an error code
98 static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
100 int n = hw_ep_bit(num, dir);
103 /* flush any pending transfer */
104 hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
105 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
107 } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
113 * hw_ep_disable: disables endpoint (execute without interruption)
114 * @num: endpoint number
115 * @dir: endpoint direction
117 * This function returns an error code
119 static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
121 hw_write(ci, OP_ENDPTCTRL + num,
122 (dir == TX) ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
127 * hw_ep_enable: enables endpoint (execute without interruption)
128 * @num: endpoint number
129 * @dir: endpoint direction
130 * @type: endpoint type
132 * This function returns an error code
134 static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
139 mask = ENDPTCTRL_TXT; /* type */
140 data = type << __ffs(mask);
142 mask |= ENDPTCTRL_TXS; /* unstall */
143 mask |= ENDPTCTRL_TXR; /* reset data toggle */
144 data |= ENDPTCTRL_TXR;
145 mask |= ENDPTCTRL_TXE; /* enable */
146 data |= ENDPTCTRL_TXE;
148 mask = ENDPTCTRL_RXT; /* type */
149 data = type << __ffs(mask);
151 mask |= ENDPTCTRL_RXS; /* unstall */
152 mask |= ENDPTCTRL_RXR; /* reset data toggle */
153 data |= ENDPTCTRL_RXR;
154 mask |= ENDPTCTRL_RXE; /* enable */
155 data |= ENDPTCTRL_RXE;
157 hw_write(ci, OP_ENDPTCTRL + num, mask, data);
162 * hw_ep_get_halt: return endpoint halt status
163 * @num: endpoint number
164 * @dir: endpoint direction
166 * This function returns 1 if endpoint halted
168 static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
170 u32 mask = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
172 return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
176 * hw_ep_prime: primes endpoint (execute without interruption)
177 * @num: endpoint number
178 * @dir: endpoint direction
179 * @is_ctrl: true if control endpoint
181 * This function returns an error code
183 static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
185 int n = hw_ep_bit(num, dir);
187 /* Synchronize before ep prime */
190 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
193 hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
195 while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
197 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
200 /* status shoult be tested according with manual but it doesn't work */
205 * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
206 * without interruption)
207 * @num: endpoint number
208 * @dir: endpoint direction
209 * @value: true => stall, false => unstall
211 * This function returns an error code
213 static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
215 if (value != 0 && value != 1)
219 enum ci_hw_regs reg = OP_ENDPTCTRL + num;
220 u32 mask_xs = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
221 u32 mask_xr = (dir == TX) ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
223 /* data toggle - reserved for EP0 but it's in ESS */
224 hw_write(ci, reg, mask_xs|mask_xr,
225 value ? mask_xs : mask_xr);
226 } while (value != hw_ep_get_halt(ci, num, dir));
232 * hw_is_port_high_speed: test if port is high speed
234 * This function returns true if high speed port
236 static int hw_port_is_high_speed(struct ci_hdrc *ci)
238 return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
239 hw_read(ci, OP_PORTSC, PORTSC_HSP);
243 * hw_test_and_clear_complete: test & clear complete status (execute without
245 * @n: endpoint number
247 * This function returns complete status
249 static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
251 n = ep_to_bit(ci, n);
252 return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
256 * hw_test_and_clear_intr_active: test & clear active interrupts (execute
257 * without interruption)
259 * This function returns active interrutps
261 static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
263 u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
265 hw_write(ci, OP_USBSTS, ~0, reg);
270 * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
273 * This function returns guard value
275 static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
277 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
281 * hw_test_and_set_setup_guard: test & set setup guard (execute without
284 * This function returns guard value
286 static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
288 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
292 * hw_usb_set_address: configures USB address (execute without interruption)
293 * @value: new USB address
295 * This function explicitly sets the address, without the "USBADRA" (advance)
296 * feature, which is not supported by older versions of the controller.
298 static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
300 hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
301 value << __ffs(DEVICEADDR_USBADR));
305 * hw_usb_reset: restart device after a bus reset (execute without
308 * This function returns an error code
310 static int hw_usb_reset(struct ci_hdrc *ci)
312 hw_usb_set_address(ci, 0);
314 /* ESS flushes only at end?!? */
315 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
317 /* clear setup token semaphores */
318 hw_write(ci, OP_ENDPTSETUPSTAT, 0, 0);
320 /* clear complete status */
321 hw_write(ci, OP_ENDPTCOMPLETE, 0, 0);
323 /* wait until all bits cleared */
324 while (hw_read(ci, OP_ENDPTPRIME, ~0))
325 udelay(10); /* not RTOS friendly */
327 /* reset all endpoints ? */
329 /* reset internal status and wait for further instructions
330 no need to verify the port reset status (ESS does it) */
335 /******************************************************************************
337 *****************************************************************************/
339 static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
344 struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
350 node->ptr = dma_pool_zalloc(hwep->td_pool, GFP_ATOMIC, &node->dma);
351 if (node->ptr == NULL) {
356 node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
357 node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
358 node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
359 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
360 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
362 if (hwreq->req.length == 0
363 || hwreq->req.length % hwep->ep.maxpacket)
365 node->ptr->token |= cpu_to_le32(mul << __ffs(TD_MULTO));
368 temp = (u32) (hwreq->req.dma + hwreq->req.actual);
370 node->ptr->page[0] = cpu_to_le32(temp);
371 for (i = 1; i < TD_PAGE_COUNT; i++) {
372 u32 page = temp + i * CI_HDRC_PAGE_SIZE;
373 page &= ~TD_RESERVED_MASK;
374 node->ptr->page[i] = cpu_to_le32(page);
378 hwreq->req.actual += length;
380 if (!list_empty(&hwreq->tds)) {
381 /* get the last entry */
382 lastnode = list_entry(hwreq->tds.prev,
384 lastnode->ptr->next = cpu_to_le32(node->dma);
387 INIT_LIST_HEAD(&node->td);
388 list_add_tail(&node->td, &hwreq->tds);
394 * _usb_addr: calculates endpoint address from direction & number
397 static inline u8 _usb_addr(struct ci_hw_ep *ep)
399 return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
403 * _hardware_enqueue: configures a request at hardware level
407 * This function returns an error code
409 static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
411 struct ci_hdrc *ci = hwep->ci;
413 unsigned rest = hwreq->req.length;
414 int pages = TD_PAGE_COUNT;
415 struct td_node *firstnode, *lastnode;
417 /* don't queue twice */
418 if (hwreq->req.status == -EALREADY)
421 hwreq->req.status = -EALREADY;
423 ret = usb_gadget_map_request_by_dev(ci->dev->parent,
424 &hwreq->req, hwep->dir);
429 * The first buffer could be not page aligned.
430 * In that case we have to span into one extra td.
432 if (hwreq->req.dma % PAGE_SIZE)
436 ret = add_td_to_list(hwep, hwreq, 0);
442 unsigned count = min(hwreq->req.length - hwreq->req.actual,
443 (unsigned)(pages * CI_HDRC_PAGE_SIZE));
444 ret = add_td_to_list(hwep, hwreq, count);
451 if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
452 && (hwreq->req.length % hwep->ep.maxpacket == 0)) {
453 ret = add_td_to_list(hwep, hwreq, 0);
458 firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
460 lastnode = list_entry(hwreq->tds.prev,
463 lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
464 if (!hwreq->req.no_interrupt)
465 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
468 hwreq->req.actual = 0;
469 if (!list_empty(&hwep->qh.queue)) {
470 struct ci_hw_req *hwreqprev;
471 int n = hw_ep_bit(hwep->num, hwep->dir);
473 struct td_node *prevlastnode;
474 u32 next = firstnode->dma & TD_ADDR_MASK;
476 hwreqprev = list_entry(hwep->qh.queue.prev,
477 struct ci_hw_req, queue);
478 prevlastnode = list_entry(hwreqprev->tds.prev,
481 prevlastnode->ptr->next = cpu_to_le32(next);
483 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
486 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
487 tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
488 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
489 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
494 /* QH configuration */
495 hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
496 hwep->qh.ptr->td.token &=
497 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
499 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
500 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
502 if (hwreq->req.length == 0
503 || hwreq->req.length % hwep->ep.maxpacket)
505 hwep->qh.ptr->cap |= cpu_to_le32(mul << __ffs(QH_MULT));
508 ret = hw_ep_prime(ci, hwep->num, hwep->dir,
509 hwep->type == USB_ENDPOINT_XFER_CONTROL);
515 * free_pending_td: remove a pending request for the endpoint
518 static void free_pending_td(struct ci_hw_ep *hwep)
520 struct td_node *pending = hwep->pending_td;
522 dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
523 hwep->pending_td = NULL;
527 static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
528 struct td_node *node)
530 hwep->qh.ptr->td.next = cpu_to_le32(node->dma);
531 hwep->qh.ptr->td.token &=
532 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
534 return hw_ep_prime(ci, hwep->num, hwep->dir,
535 hwep->type == USB_ENDPOINT_XFER_CONTROL);
539 * _hardware_dequeue: handles a request at hardware level
543 * This function returns an error code
545 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
548 struct td_node *node, *tmpnode;
549 unsigned remaining_length;
550 unsigned actual = hwreq->req.length;
551 struct ci_hdrc *ci = hwep->ci;
553 if (hwreq->req.status != -EALREADY)
556 hwreq->req.status = 0;
558 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
559 tmptoken = le32_to_cpu(node->ptr->token);
560 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
561 int n = hw_ep_bit(hwep->num, hwep->dir);
563 if (ci->rev == CI_REVISION_24)
564 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
565 reprime_dtd(ci, hwep, node);
566 hwreq->req.status = -EALREADY;
570 remaining_length = (tmptoken & TD_TOTAL_BYTES);
571 remaining_length >>= __ffs(TD_TOTAL_BYTES);
572 actual -= remaining_length;
574 hwreq->req.status = tmptoken & TD_STATUS;
575 if ((TD_STATUS_HALTED & hwreq->req.status)) {
576 hwreq->req.status = -EPIPE;
578 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
579 hwreq->req.status = -EPROTO;
581 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
582 hwreq->req.status = -EILSEQ;
586 if (remaining_length) {
587 if (hwep->dir == TX) {
588 hwreq->req.status = -EPROTO;
593 * As the hardware could still address the freed td
594 * which will run the udc unusable, the cleanup of the
595 * td has to be delayed by one.
597 if (hwep->pending_td)
598 free_pending_td(hwep);
600 hwep->pending_td = node;
601 list_del_init(&node->td);
604 usb_gadget_unmap_request_by_dev(hwep->ci->dev->parent,
605 &hwreq->req, hwep->dir);
607 hwreq->req.actual += actual;
609 if (hwreq->req.status)
610 return hwreq->req.status;
612 return hwreq->req.actual;
616 * _ep_nuke: dequeues all endpoint requests
619 * This function returns an error code
620 * Caller must hold lock
622 static int _ep_nuke(struct ci_hw_ep *hwep)
623 __releases(hwep->lock)
624 __acquires(hwep->lock)
626 struct td_node *node, *tmpnode;
630 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
632 while (!list_empty(&hwep->qh.queue)) {
634 /* pop oldest request */
635 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
636 struct ci_hw_req, queue);
638 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
639 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
640 list_del_init(&node->td);
645 list_del_init(&hwreq->queue);
646 hwreq->req.status = -ESHUTDOWN;
648 if (hwreq->req.complete != NULL) {
649 spin_unlock(hwep->lock);
650 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
651 spin_lock(hwep->lock);
655 if (hwep->pending_td)
656 free_pending_td(hwep);
661 static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
663 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
664 int direction, retval = 0;
667 if (ep == NULL || hwep->ep.desc == NULL)
670 if (usb_endpoint_xfer_isoc(hwep->ep.desc))
673 spin_lock_irqsave(hwep->lock, flags);
675 if (value && hwep->dir == TX && check_transfer &&
676 !list_empty(&hwep->qh.queue) &&
677 !usb_endpoint_xfer_control(hwep->ep.desc)) {
678 spin_unlock_irqrestore(hwep->lock, flags);
682 direction = hwep->dir;
684 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
689 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
690 hwep->dir = (hwep->dir == TX) ? RX : TX;
692 } while (hwep->dir != direction);
694 spin_unlock_irqrestore(hwep->lock, flags);
700 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
703 * This function returns an error code
705 static int _gadget_stop_activity(struct usb_gadget *gadget)
708 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
711 /* flush all endpoints */
712 gadget_for_each_ep(ep, gadget) {
713 usb_ep_fifo_flush(ep);
715 usb_ep_fifo_flush(&ci->ep0out->ep);
716 usb_ep_fifo_flush(&ci->ep0in->ep);
718 /* make sure to disable all endpoints */
719 gadget_for_each_ep(ep, gadget) {
723 if (ci->status != NULL) {
724 usb_ep_free_request(&ci->ep0in->ep, ci->status);
728 spin_lock_irqsave(&ci->lock, flags);
729 ci->gadget.speed = USB_SPEED_UNKNOWN;
730 ci->remote_wakeup = 0;
732 spin_unlock_irqrestore(&ci->lock, flags);
737 /******************************************************************************
739 *****************************************************************************/
741 * isr_reset_handler: USB reset interrupt handler
744 * This function resets USB engine after a bus reset occurred
746 static void isr_reset_handler(struct ci_hdrc *ci)
752 spin_unlock(&ci->lock);
753 if (ci->gadget.speed != USB_SPEED_UNKNOWN)
754 usb_gadget_udc_reset(&ci->gadget, ci->driver);
756 retval = _gadget_stop_activity(&ci->gadget);
760 retval = hw_usb_reset(ci);
764 ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
765 if (ci->status == NULL)
769 spin_lock(&ci->lock);
772 dev_err(ci->dev, "error: %i\n", retval);
776 * isr_get_status_complete: get_status request complete function
778 * @req: request handled
780 * Caller must release lock
782 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
784 if (ep == NULL || req == NULL)
788 usb_ep_free_request(ep, req);
792 * _ep_queue: queues (submits) an I/O request to an endpoint
795 * @gfp_flags: GFP flags (not used)
797 * Caller must hold lock
798 * This function returns an error code
800 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
801 gfp_t __maybe_unused gfp_flags)
803 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
804 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
805 struct ci_hdrc *ci = hwep->ci;
808 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
811 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
813 hwep = (ci->ep0_dir == RX) ?
814 ci->ep0out : ci->ep0in;
815 if (!list_empty(&hwep->qh.queue)) {
817 dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
822 if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
823 hwreq->req.length > hwep->ep.mult * hwep->ep.maxpacket) {
824 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
828 /* first nuke then test link, e.g. previous status has not sent */
829 if (!list_empty(&hwreq->queue)) {
830 dev_err(hwep->ci->dev, "request already in queue\n");
835 hwreq->req.status = -EINPROGRESS;
836 hwreq->req.actual = 0;
838 retval = _hardware_enqueue(hwep, hwreq);
840 if (retval == -EALREADY)
843 list_add_tail(&hwreq->queue, &hwep->qh.queue);
849 * isr_get_status_response: get_status request response
851 * @setup: setup request packet
853 * This function returns an error code
855 static int isr_get_status_response(struct ci_hdrc *ci,
856 struct usb_ctrlrequest *setup)
857 __releases(hwep->lock)
858 __acquires(hwep->lock)
860 struct ci_hw_ep *hwep = ci->ep0in;
861 struct usb_request *req = NULL;
862 gfp_t gfp_flags = GFP_ATOMIC;
863 int dir, num, retval;
865 if (hwep == NULL || setup == NULL)
868 spin_unlock(hwep->lock);
869 req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
870 spin_lock(hwep->lock);
874 req->complete = isr_get_status_complete;
876 req->buf = kzalloc(req->length, gfp_flags);
877 if (req->buf == NULL) {
882 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
883 *(u16 *)req->buf = (ci->remote_wakeup << 1) |
884 ci->gadget.is_selfpowered;
885 } else if ((setup->bRequestType & USB_RECIP_MASK) \
886 == USB_RECIP_ENDPOINT) {
887 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
889 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
890 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
892 /* else do nothing; reserved for future use */
894 retval = _ep_queue(&hwep->ep, req, gfp_flags);
903 spin_unlock(hwep->lock);
904 usb_ep_free_request(&hwep->ep, req);
905 spin_lock(hwep->lock);
910 * isr_setup_status_complete: setup_status request complete function
912 * @req: request handled
914 * Caller must release lock. Put the port in test mode if test mode
915 * feature is selected.
918 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
920 struct ci_hdrc *ci = req->context;
927 hw_usb_set_address(ci, ci->address);
930 usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
933 spin_lock_irqsave(&ci->lock, flags);
935 hw_port_test_set(ci, ci->test_mode);
936 spin_unlock_irqrestore(&ci->lock, flags);
940 * isr_setup_status_phase: queues the status phase of a setup transation
943 * This function returns an error code
945 static int isr_setup_status_phase(struct ci_hdrc *ci)
947 struct ci_hw_ep *hwep;
950 * Unexpected USB controller behavior, caused by bad signal integrity
951 * or ground reference problems, can lead to isr_setup_status_phase
952 * being called with ci->status equal to NULL.
953 * If this situation occurs, you should review your USB hardware design.
955 if (WARN_ON_ONCE(!ci->status))
958 hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
959 ci->status->context = ci;
960 ci->status->complete = isr_setup_status_complete;
962 return _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
966 * isr_tr_complete_low: transaction complete low level handler
969 * This function returns an error code
970 * Caller must hold lock
972 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
973 __releases(hwep->lock)
974 __acquires(hwep->lock)
976 struct ci_hw_req *hwreq, *hwreqtemp;
977 struct ci_hw_ep *hweptemp = hwep;
980 list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
982 retval = _hardware_dequeue(hwep, hwreq);
985 list_del_init(&hwreq->queue);
986 if (hwreq->req.complete != NULL) {
987 spin_unlock(hwep->lock);
988 if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
990 hweptemp = hwep->ci->ep0in;
991 usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
992 spin_lock(hwep->lock);
996 if (retval == -EBUSY)
1002 static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
1004 dev_warn(&ci->gadget.dev,
1005 "connect the device to an alternate port if you want HNP\n");
1006 return isr_setup_status_phase(ci);
1010 * isr_setup_packet_handler: setup packet handler
1011 * @ci: UDC descriptor
1013 * This function handles setup packet
1015 static void isr_setup_packet_handler(struct ci_hdrc *ci)
1016 __releases(ci->lock)
1017 __acquires(ci->lock)
1019 struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1020 struct usb_ctrlrequest req;
1021 int type, num, dir, err = -EINVAL;
1025 * Flush data and handshake transactions of previous
1028 _ep_nuke(ci->ep0out);
1029 _ep_nuke(ci->ep0in);
1031 /* read_setup_packet */
1033 hw_test_and_set_setup_guard(ci);
1034 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1035 } while (!hw_test_and_clear_setup_guard(ci));
1037 type = req.bRequestType;
1039 ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1041 switch (req.bRequest) {
1042 case USB_REQ_CLEAR_FEATURE:
1043 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1044 le16_to_cpu(req.wValue) ==
1045 USB_ENDPOINT_HALT) {
1046 if (req.wLength != 0)
1048 num = le16_to_cpu(req.wIndex);
1049 dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1050 num &= USB_ENDPOINT_NUMBER_MASK;
1052 num += ci->hw_ep_max / 2;
1053 if (!ci->ci_hw_ep[num].wedge) {
1054 spin_unlock(&ci->lock);
1055 err = usb_ep_clear_halt(
1056 &ci->ci_hw_ep[num].ep);
1057 spin_lock(&ci->lock);
1061 err = isr_setup_status_phase(ci);
1062 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1063 le16_to_cpu(req.wValue) ==
1064 USB_DEVICE_REMOTE_WAKEUP) {
1065 if (req.wLength != 0)
1067 ci->remote_wakeup = 0;
1068 err = isr_setup_status_phase(ci);
1073 case USB_REQ_GET_STATUS:
1074 if ((type != (USB_DIR_IN|USB_RECIP_DEVICE) ||
1075 le16_to_cpu(req.wIndex) == OTG_STS_SELECTOR) &&
1076 type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1077 type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1079 if (le16_to_cpu(req.wLength) != 2 ||
1080 le16_to_cpu(req.wValue) != 0)
1082 err = isr_get_status_response(ci, &req);
1084 case USB_REQ_SET_ADDRESS:
1085 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1087 if (le16_to_cpu(req.wLength) != 0 ||
1088 le16_to_cpu(req.wIndex) != 0)
1090 ci->address = (u8)le16_to_cpu(req.wValue);
1092 err = isr_setup_status_phase(ci);
1094 case USB_REQ_SET_FEATURE:
1095 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1096 le16_to_cpu(req.wValue) ==
1097 USB_ENDPOINT_HALT) {
1098 if (req.wLength != 0)
1100 num = le16_to_cpu(req.wIndex);
1101 dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1102 num &= USB_ENDPOINT_NUMBER_MASK;
1104 num += ci->hw_ep_max / 2;
1106 spin_unlock(&ci->lock);
1107 err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1108 spin_lock(&ci->lock);
1110 isr_setup_status_phase(ci);
1111 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1112 if (req.wLength != 0)
1114 switch (le16_to_cpu(req.wValue)) {
1115 case USB_DEVICE_REMOTE_WAKEUP:
1116 ci->remote_wakeup = 1;
1117 err = isr_setup_status_phase(ci);
1119 case USB_DEVICE_TEST_MODE:
1120 tmode = le16_to_cpu(req.wIndex) >> 8;
1127 ci->test_mode = tmode;
1128 err = isr_setup_status_phase(
1135 case USB_DEVICE_B_HNP_ENABLE:
1136 if (ci_otg_is_fsm_mode(ci)) {
1137 ci->gadget.b_hnp_enable = 1;
1138 err = isr_setup_status_phase(
1142 case USB_DEVICE_A_ALT_HNP_SUPPORT:
1143 if (ci_otg_is_fsm_mode(ci))
1144 err = otg_a_alt_hnp_support(ci);
1146 case USB_DEVICE_A_HNP_SUPPORT:
1147 if (ci_otg_is_fsm_mode(ci)) {
1148 ci->gadget.a_hnp_support = 1;
1149 err = isr_setup_status_phase(
1162 if (req.wLength == 0) /* no data phase */
1165 spin_unlock(&ci->lock);
1166 err = ci->driver->setup(&ci->gadget, &req);
1167 spin_lock(&ci->lock);
1172 spin_unlock(&ci->lock);
1173 if (_ep_set_halt(&hwep->ep, 1, false))
1174 dev_err(ci->dev, "error: _ep_set_halt\n");
1175 spin_lock(&ci->lock);
1180 * isr_tr_complete_handler: transaction complete interrupt handler
1181 * @ci: UDC descriptor
1183 * This function handles traffic events
1185 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1186 __releases(ci->lock)
1187 __acquires(ci->lock)
1192 for (i = 0; i < ci->hw_ep_max; i++) {
1193 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1195 if (hwep->ep.desc == NULL)
1196 continue; /* not configured */
1198 if (hw_test_and_clear_complete(ci, i)) {
1199 err = isr_tr_complete_low(hwep);
1200 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1201 if (err > 0) /* needs status phase */
1202 err = isr_setup_status_phase(ci);
1204 spin_unlock(&ci->lock);
1205 if (_ep_set_halt(&hwep->ep, 1, false))
1207 "error: _ep_set_halt\n");
1208 spin_lock(&ci->lock);
1213 /* Only handle setup packet below */
1215 hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1216 isr_setup_packet_handler(ci);
1220 /******************************************************************************
1222 *****************************************************************************/
1224 * ep_enable: configure endpoint, making it usable
1226 * Check usb_ep_enable() at "usb_gadget.h" for details
1228 static int ep_enable(struct usb_ep *ep,
1229 const struct usb_endpoint_descriptor *desc)
1231 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1233 unsigned long flags;
1236 if (ep == NULL || desc == NULL)
1239 spin_lock_irqsave(hwep->lock, flags);
1241 /* only internal SW should enable ctrl endpts */
1243 if (!list_empty(&hwep->qh.queue)) {
1244 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1245 spin_unlock_irqrestore(hwep->lock, flags);
1249 hwep->ep.desc = desc;
1251 hwep->dir = usb_endpoint_dir_in(desc) ? TX : RX;
1252 hwep->num = usb_endpoint_num(desc);
1253 hwep->type = usb_endpoint_type(desc);
1255 hwep->ep.maxpacket = usb_endpoint_maxp(desc);
1256 hwep->ep.mult = usb_endpoint_maxp_mult(desc);
1258 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1262 cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1264 * For ISO-TX, we set mult at QH as the largest value, and use
1265 * MultO at TD as real mult value.
1267 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1268 cap |= 3 << __ffs(QH_MULT);
1270 hwep->qh.ptr->cap = cpu_to_le32(cap);
1272 hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE); /* needed? */
1274 if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1275 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1280 * Enable endpoints in the HW other than ep0 as ep0
1284 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1287 spin_unlock_irqrestore(hwep->lock, flags);
1292 * ep_disable: endpoint is no longer usable
1294 * Check usb_ep_disable() at "usb_gadget.h" for details
1296 static int ep_disable(struct usb_ep *ep)
1298 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1299 int direction, retval = 0;
1300 unsigned long flags;
1304 else if (hwep->ep.desc == NULL)
1307 spin_lock_irqsave(hwep->lock, flags);
1308 if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1309 spin_unlock_irqrestore(hwep->lock, flags);
1313 /* only internal SW should disable ctrl endpts */
1315 direction = hwep->dir;
1317 retval |= _ep_nuke(hwep);
1318 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1320 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1321 hwep->dir = (hwep->dir == TX) ? RX : TX;
1323 } while (hwep->dir != direction);
1325 hwep->ep.desc = NULL;
1327 spin_unlock_irqrestore(hwep->lock, flags);
1332 * ep_alloc_request: allocate a request object to use with this endpoint
1334 * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1336 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1338 struct ci_hw_req *hwreq = NULL;
1343 hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1344 if (hwreq != NULL) {
1345 INIT_LIST_HEAD(&hwreq->queue);
1346 INIT_LIST_HEAD(&hwreq->tds);
1349 return (hwreq == NULL) ? NULL : &hwreq->req;
1353 * ep_free_request: frees a request object
1355 * Check usb_ep_free_request() at "usb_gadget.h" for details
1357 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1359 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1360 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1361 struct td_node *node, *tmpnode;
1362 unsigned long flags;
1364 if (ep == NULL || req == NULL) {
1366 } else if (!list_empty(&hwreq->queue)) {
1367 dev_err(hwep->ci->dev, "freeing queued request\n");
1371 spin_lock_irqsave(hwep->lock, flags);
1373 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1374 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1375 list_del_init(&node->td);
1382 spin_unlock_irqrestore(hwep->lock, flags);
1386 * ep_queue: queues (submits) an I/O request to an endpoint
1388 * Check usb_ep_queue()* at usb_gadget.h" for details
1390 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1391 gfp_t __maybe_unused gfp_flags)
1393 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1395 unsigned long flags;
1397 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1400 spin_lock_irqsave(hwep->lock, flags);
1401 if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1402 spin_unlock_irqrestore(hwep->lock, flags);
1405 retval = _ep_queue(ep, req, gfp_flags);
1406 spin_unlock_irqrestore(hwep->lock, flags);
1411 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1413 * Check usb_ep_dequeue() at "usb_gadget.h" for details
1415 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1417 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1418 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1419 unsigned long flags;
1420 struct td_node *node, *tmpnode;
1422 if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1423 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1424 list_empty(&hwep->qh.queue))
1427 spin_lock_irqsave(hwep->lock, flags);
1428 if (hwep->ci->gadget.speed != USB_SPEED_UNKNOWN)
1429 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1431 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1432 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1433 list_del(&node->td);
1438 list_del_init(&hwreq->queue);
1440 usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1442 req->status = -ECONNRESET;
1444 if (hwreq->req.complete != NULL) {
1445 spin_unlock(hwep->lock);
1446 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1447 spin_lock(hwep->lock);
1450 spin_unlock_irqrestore(hwep->lock, flags);
1455 * ep_set_halt: sets the endpoint halt feature
1457 * Check usb_ep_set_halt() at "usb_gadget.h" for details
1459 static int ep_set_halt(struct usb_ep *ep, int value)
1461 return _ep_set_halt(ep, value, true);
1465 * ep_set_wedge: sets the halt feature and ignores clear requests
1467 * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1469 static int ep_set_wedge(struct usb_ep *ep)
1471 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1472 unsigned long flags;
1474 if (ep == NULL || hwep->ep.desc == NULL)
1477 spin_lock_irqsave(hwep->lock, flags);
1479 spin_unlock_irqrestore(hwep->lock, flags);
1481 return usb_ep_set_halt(ep);
1485 * ep_fifo_flush: flushes contents of a fifo
1487 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1489 static void ep_fifo_flush(struct usb_ep *ep)
1491 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1492 unsigned long flags;
1495 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1499 spin_lock_irqsave(hwep->lock, flags);
1500 if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1501 spin_unlock_irqrestore(hwep->lock, flags);
1505 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1507 spin_unlock_irqrestore(hwep->lock, flags);
1511 * Endpoint-specific part of the API to the USB controller hardware
1512 * Check "usb_gadget.h" for details
1514 static const struct usb_ep_ops usb_ep_ops = {
1515 .enable = ep_enable,
1516 .disable = ep_disable,
1517 .alloc_request = ep_alloc_request,
1518 .free_request = ep_free_request,
1520 .dequeue = ep_dequeue,
1521 .set_halt = ep_set_halt,
1522 .set_wedge = ep_set_wedge,
1523 .fifo_flush = ep_fifo_flush,
1526 /******************************************************************************
1528 *****************************************************************************/
1529 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1531 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1532 unsigned long flags;
1533 int gadget_ready = 0;
1535 spin_lock_irqsave(&ci->lock, flags);
1536 ci->vbus_active = is_active;
1539 spin_unlock_irqrestore(&ci->lock, flags);
1542 usb_phy_set_charger_state(ci->usb_phy, is_active ?
1543 USB_CHARGER_PRESENT : USB_CHARGER_ABSENT);
1547 pm_runtime_get_sync(&_gadget->dev);
1548 hw_device_reset(ci);
1549 hw_device_state(ci, ci->ep0out->qh.dma);
1550 usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1551 usb_udc_vbus_handler(_gadget, true);
1553 usb_udc_vbus_handler(_gadget, false);
1555 ci->driver->disconnect(&ci->gadget);
1556 hw_device_state(ci, 0);
1557 if (ci->platdata->notify_event)
1558 ci->platdata->notify_event(ci,
1559 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1560 _gadget_stop_activity(&ci->gadget);
1561 pm_runtime_put_sync(&_gadget->dev);
1562 usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1569 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1571 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1572 unsigned long flags;
1575 spin_lock_irqsave(&ci->lock, flags);
1576 if (ci->gadget.speed == USB_SPEED_UNKNOWN) {
1577 spin_unlock_irqrestore(&ci->lock, flags);
1580 if (!ci->remote_wakeup) {
1584 if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1588 hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1590 spin_unlock_irqrestore(&ci->lock, flags);
1594 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1596 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1599 return usb_phy_set_power(ci->usb_phy, ma);
1603 static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1605 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1606 struct ci_hw_ep *hwep = ci->ep0in;
1607 unsigned long flags;
1609 spin_lock_irqsave(hwep->lock, flags);
1610 _gadget->is_selfpowered = (is_on != 0);
1611 spin_unlock_irqrestore(hwep->lock, flags);
1616 /* Change Data+ pullup status
1617 * this func is used by usb_gadget_connect/disconnet
1619 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1621 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1624 * Data+ pullup controlled by OTG state machine in OTG fsm mode;
1625 * and don't touch Data+ in host mode for dual role config.
1627 if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST)
1630 pm_runtime_get_sync(&ci->gadget.dev);
1632 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1634 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1635 pm_runtime_put_sync(&ci->gadget.dev);
1640 static int ci_udc_start(struct usb_gadget *gadget,
1641 struct usb_gadget_driver *driver);
1642 static int ci_udc_stop(struct usb_gadget *gadget);
1644 /* Match ISOC IN from the highest endpoint */
1645 static struct usb_ep *ci_udc_match_ep(struct usb_gadget *gadget,
1646 struct usb_endpoint_descriptor *desc,
1647 struct usb_ss_ep_comp_descriptor *comp_desc)
1649 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1652 if (usb_endpoint_xfer_isoc(desc) && usb_endpoint_dir_in(desc)) {
1653 list_for_each_entry_reverse(ep, &ci->gadget.ep_list, ep_list) {
1654 if (ep->caps.dir_in && !ep->claimed)
1663 * Device operations part of the API to the USB controller hardware,
1664 * which don't involve endpoints (or i/o)
1665 * Check "usb_gadget.h" for details
1667 static const struct usb_gadget_ops usb_gadget_ops = {
1668 .vbus_session = ci_udc_vbus_session,
1669 .wakeup = ci_udc_wakeup,
1670 .set_selfpowered = ci_udc_selfpowered,
1671 .pullup = ci_udc_pullup,
1672 .vbus_draw = ci_udc_vbus_draw,
1673 .udc_start = ci_udc_start,
1674 .udc_stop = ci_udc_stop,
1675 .match_ep = ci_udc_match_ep,
1678 static int init_eps(struct ci_hdrc *ci)
1680 int retval = 0, i, j;
1682 for (i = 0; i < ci->hw_ep_max/2; i++)
1683 for (j = RX; j <= TX; j++) {
1684 int k = i + j * ci->hw_ep_max/2;
1685 struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1687 scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1688 (j == TX) ? "in" : "out");
1691 hwep->lock = &ci->lock;
1692 hwep->td_pool = ci->td_pool;
1694 hwep->ep.name = hwep->name;
1695 hwep->ep.ops = &usb_ep_ops;
1698 hwep->ep.caps.type_control = true;
1700 hwep->ep.caps.type_iso = true;
1701 hwep->ep.caps.type_bulk = true;
1702 hwep->ep.caps.type_int = true;
1706 hwep->ep.caps.dir_in = true;
1708 hwep->ep.caps.dir_out = true;
1711 * for ep0: maxP defined in desc, for other
1712 * eps, maxP is set by epautoconfig() called
1715 usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1717 INIT_LIST_HEAD(&hwep->qh.queue);
1718 hwep->qh.ptr = dma_pool_zalloc(ci->qh_pool, GFP_KERNEL,
1720 if (hwep->qh.ptr == NULL)
1724 * set up shorthands for ep0 out and in endpoints,
1725 * don't add to gadget's ep_list
1733 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1737 list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1743 static void destroy_eps(struct ci_hdrc *ci)
1747 for (i = 0; i < ci->hw_ep_max; i++) {
1748 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1750 if (hwep->pending_td)
1751 free_pending_td(hwep);
1752 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1757 * ci_udc_start: register a gadget driver
1758 * @gadget: our gadget
1759 * @driver: the driver being registered
1761 * Interrupts are enabled here.
1763 static int ci_udc_start(struct usb_gadget *gadget,
1764 struct usb_gadget_driver *driver)
1766 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1767 int retval = -ENOMEM;
1769 if (driver->disconnect == NULL)
1773 ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1774 retval = usb_ep_enable(&ci->ep0out->ep);
1778 ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1779 retval = usb_ep_enable(&ci->ep0in->ep);
1783 ci->driver = driver;
1785 /* Start otg fsm for B-device */
1786 if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1787 ci_hdrc_otg_fsm_start(ci);
1791 pm_runtime_get_sync(&ci->gadget.dev);
1792 if (ci->vbus_active) {
1793 hw_device_reset(ci);
1795 usb_udc_vbus_handler(&ci->gadget, false);
1796 pm_runtime_put_sync(&ci->gadget.dev);
1800 retval = hw_device_state(ci, ci->ep0out->qh.dma);
1802 pm_runtime_put_sync(&ci->gadget.dev);
1807 static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
1809 if (!ci_otg_is_fsm_mode(ci))
1812 mutex_lock(&ci->fsm.lock);
1813 if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
1814 ci->fsm.a_bidl_adis_tmout = 1;
1815 ci_hdrc_otg_fsm_start(ci);
1816 } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
1817 ci->fsm.protocol = PROTO_UNDEF;
1818 ci->fsm.otg->state = OTG_STATE_UNDEFINED;
1820 mutex_unlock(&ci->fsm.lock);
1824 * ci_udc_stop: unregister a gadget driver
1826 static int ci_udc_stop(struct usb_gadget *gadget)
1828 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1829 unsigned long flags;
1831 spin_lock_irqsave(&ci->lock, flags);
1833 if (ci->vbus_active) {
1834 hw_device_state(ci, 0);
1835 spin_unlock_irqrestore(&ci->lock, flags);
1836 if (ci->platdata->notify_event)
1837 ci->platdata->notify_event(ci,
1838 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1839 _gadget_stop_activity(&ci->gadget);
1840 spin_lock_irqsave(&ci->lock, flags);
1841 pm_runtime_put(&ci->gadget.dev);
1845 spin_unlock_irqrestore(&ci->lock, flags);
1847 ci_udc_stop_for_otg_fsm(ci);
1851 /******************************************************************************
1853 *****************************************************************************/
1855 * udc_irq: ci interrupt handler
1857 * This function returns IRQ_HANDLED if the IRQ has been handled
1858 * It locks access to registers
1860 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1868 spin_lock(&ci->lock);
1870 if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1871 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1873 spin_unlock(&ci->lock);
1877 intr = hw_test_and_clear_intr_active(ci);
1880 /* order defines priority - do NOT change it */
1881 if (USBi_URI & intr)
1882 isr_reset_handler(ci);
1884 if (USBi_PCI & intr) {
1885 ci->gadget.speed = hw_port_is_high_speed(ci) ?
1886 USB_SPEED_HIGH : USB_SPEED_FULL;
1887 if (ci->suspended) {
1888 if (ci->driver->resume) {
1889 spin_unlock(&ci->lock);
1890 ci->driver->resume(&ci->gadget);
1891 spin_lock(&ci->lock);
1894 usb_gadget_set_state(&ci->gadget,
1900 isr_tr_complete_handler(ci);
1902 if ((USBi_SLI & intr) && !(ci->suspended)) {
1904 ci->resume_state = ci->gadget.state;
1905 if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1906 ci->driver->suspend) {
1907 spin_unlock(&ci->lock);
1908 ci->driver->suspend(&ci->gadget);
1909 spin_lock(&ci->lock);
1911 usb_gadget_set_state(&ci->gadget,
1912 USB_STATE_SUSPENDED);
1914 retval = IRQ_HANDLED;
1918 spin_unlock(&ci->lock);
1924 * udc_start: initialize gadget role
1925 * @ci: chipidea controller
1927 static int udc_start(struct ci_hdrc *ci)
1929 struct device *dev = ci->dev;
1930 struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
1933 ci->gadget.ops = &usb_gadget_ops;
1934 ci->gadget.speed = USB_SPEED_UNKNOWN;
1935 ci->gadget.max_speed = USB_SPEED_HIGH;
1936 ci->gadget.name = ci->platdata->name;
1937 ci->gadget.otg_caps = otg_caps;
1939 if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA)
1940 ci->gadget.quirk_avoids_skb_reserve = 1;
1942 if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
1943 otg_caps->adp_support))
1944 ci->gadget.is_otg = 1;
1946 INIT_LIST_HEAD(&ci->gadget.ep_list);
1948 /* alloc resources */
1949 ci->qh_pool = dma_pool_create("ci_hw_qh", dev->parent,
1950 sizeof(struct ci_hw_qh),
1951 64, CI_HDRC_PAGE_SIZE);
1952 if (ci->qh_pool == NULL)
1955 ci->td_pool = dma_pool_create("ci_hw_td", dev->parent,
1956 sizeof(struct ci_hw_td),
1957 64, CI_HDRC_PAGE_SIZE);
1958 if (ci->td_pool == NULL) {
1963 retval = init_eps(ci);
1967 ci->gadget.ep0 = &ci->ep0in->ep;
1969 retval = usb_add_gadget_udc(dev, &ci->gadget);
1973 pm_runtime_no_callbacks(&ci->gadget.dev);
1974 pm_runtime_enable(&ci->gadget.dev);
1981 dma_pool_destroy(ci->td_pool);
1983 dma_pool_destroy(ci->qh_pool);
1988 * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1990 * No interrupts active, the IRQ has been released
1992 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1994 if (!ci->roles[CI_ROLE_GADGET])
1997 usb_del_gadget_udc(&ci->gadget);
2001 dma_pool_destroy(ci->td_pool);
2002 dma_pool_destroy(ci->qh_pool);
2005 static int udc_id_switch_for_device(struct ci_hdrc *ci)
2008 /* Clear and enable BSV irq */
2009 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
2010 OTGSC_BSVIS | OTGSC_BSVIE);
2015 static void udc_id_switch_for_host(struct ci_hdrc *ci)
2018 * host doesn't care B_SESSION_VALID event
2019 * so clear and disbale BSV irq
2022 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
2024 ci->vbus_active = 0;
2028 * ci_hdrc_gadget_init - initialize device related bits
2029 * ci: the controller
2031 * This function initializes the gadget, if the device is "device capable".
2033 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
2035 struct ci_role_driver *rdrv;
2038 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
2041 rdrv = devm_kzalloc(ci->dev, sizeof(*rdrv), GFP_KERNEL);
2045 rdrv->start = udc_id_switch_for_device;
2046 rdrv->stop = udc_id_switch_for_host;
2047 rdrv->irq = udc_irq;
2048 rdrv->name = "gadget";
2050 ret = udc_start(ci);
2052 ci->roles[CI_ROLE_GADGET] = rdrv;