2 * udc.c - ChipIdea UDC driver
4 * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/delay.h>
14 #include <linux/device.h>
15 #include <linux/dmapool.h>
16 #include <linux/err.h>
17 #include <linux/irqreturn.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
20 #include <linux/pm_runtime.h>
21 #include <linux/usb/ch9.h>
22 #include <linux/usb/gadget.h>
23 #include <linux/usb/otg-fsm.h>
24 #include <linux/usb/chipidea.h>
32 /* control endpoint description */
33 static const struct usb_endpoint_descriptor
34 ctrl_endpt_out_desc = {
35 .bLength = USB_DT_ENDPOINT_SIZE,
36 .bDescriptorType = USB_DT_ENDPOINT,
38 .bEndpointAddress = USB_DIR_OUT,
39 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
40 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
43 static const struct usb_endpoint_descriptor
44 ctrl_endpt_in_desc = {
45 .bLength = USB_DT_ENDPOINT_SIZE,
46 .bDescriptorType = USB_DT_ENDPOINT,
48 .bEndpointAddress = USB_DIR_IN,
49 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
50 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
54 * hw_ep_bit: calculates the bit number
55 * @num: endpoint number
56 * @dir: endpoint direction
58 * This function returns bit number
60 static inline int hw_ep_bit(int num, int dir)
62 return num + ((dir == TX) ? 16 : 0);
65 static inline int ep_to_bit(struct ci_hdrc *ci, int n)
67 int fill = 16 - ci->hw_ep_max / 2;
69 if (n >= ci->hw_ep_max / 2)
76 * hw_device_state: enables/disables interrupts (execute without interruption)
77 * @dma: 0 => disable, !0 => enable and set dma engine
79 * This function returns an error code
81 static int hw_device_state(struct ci_hdrc *ci, u32 dma)
84 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
85 /* interrupt, error, port change, reset, sleep/suspend */
86 hw_write(ci, OP_USBINTR, ~0,
87 USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
89 hw_write(ci, OP_USBINTR, ~0, 0);
95 * hw_ep_flush: flush endpoint fifo (execute without interruption)
96 * @num: endpoint number
97 * @dir: endpoint direction
99 * This function returns an error code
101 static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
103 int n = hw_ep_bit(num, dir);
106 /* flush any pending transfer */
107 hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
108 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
110 } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
116 * hw_ep_disable: disables endpoint (execute without interruption)
117 * @num: endpoint number
118 * @dir: endpoint direction
120 * This function returns an error code
122 static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
124 hw_write(ci, OP_ENDPTCTRL + num,
125 (dir == TX) ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
130 * hw_ep_enable: enables endpoint (execute without interruption)
131 * @num: endpoint number
132 * @dir: endpoint direction
133 * @type: endpoint type
135 * This function returns an error code
137 static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
142 mask = ENDPTCTRL_TXT; /* type */
143 data = type << __ffs(mask);
145 mask |= ENDPTCTRL_TXS; /* unstall */
146 mask |= ENDPTCTRL_TXR; /* reset data toggle */
147 data |= ENDPTCTRL_TXR;
148 mask |= ENDPTCTRL_TXE; /* enable */
149 data |= ENDPTCTRL_TXE;
151 mask = ENDPTCTRL_RXT; /* type */
152 data = type << __ffs(mask);
154 mask |= ENDPTCTRL_RXS; /* unstall */
155 mask |= ENDPTCTRL_RXR; /* reset data toggle */
156 data |= ENDPTCTRL_RXR;
157 mask |= ENDPTCTRL_RXE; /* enable */
158 data |= ENDPTCTRL_RXE;
160 hw_write(ci, OP_ENDPTCTRL + num, mask, data);
165 * hw_ep_get_halt: return endpoint halt status
166 * @num: endpoint number
167 * @dir: endpoint direction
169 * This function returns 1 if endpoint halted
171 static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
173 u32 mask = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
175 return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
179 * hw_ep_prime: primes endpoint (execute without interruption)
180 * @num: endpoint number
181 * @dir: endpoint direction
182 * @is_ctrl: true if control endpoint
184 * This function returns an error code
186 static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
188 int n = hw_ep_bit(num, dir);
190 /* Synchronize before ep prime */
193 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
196 hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
198 while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
200 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
203 /* status shoult be tested according with manual but it doesn't work */
208 * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
209 * without interruption)
210 * @num: endpoint number
211 * @dir: endpoint direction
212 * @value: true => stall, false => unstall
214 * This function returns an error code
216 static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
218 if (value != 0 && value != 1)
222 enum ci_hw_regs reg = OP_ENDPTCTRL + num;
223 u32 mask_xs = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
224 u32 mask_xr = (dir == TX) ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
226 /* data toggle - reserved for EP0 but it's in ESS */
227 hw_write(ci, reg, mask_xs|mask_xr,
228 value ? mask_xs : mask_xr);
229 } while (value != hw_ep_get_halt(ci, num, dir));
235 * hw_is_port_high_speed: test if port is high speed
237 * This function returns true if high speed port
239 static int hw_port_is_high_speed(struct ci_hdrc *ci)
241 return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
242 hw_read(ci, OP_PORTSC, PORTSC_HSP);
246 * hw_test_and_clear_complete: test & clear complete status (execute without
248 * @n: endpoint number
250 * This function returns complete status
252 static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
254 n = ep_to_bit(ci, n);
255 return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
259 * hw_test_and_clear_intr_active: test & clear active interrupts (execute
260 * without interruption)
262 * This function returns active interrutps
264 static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
266 u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
268 hw_write(ci, OP_USBSTS, ~0, reg);
273 * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
276 * This function returns guard value
278 static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
280 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
284 * hw_test_and_set_setup_guard: test & set setup guard (execute without
287 * This function returns guard value
289 static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
291 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
295 * hw_usb_set_address: configures USB address (execute without interruption)
296 * @value: new USB address
298 * This function explicitly sets the address, without the "USBADRA" (advance)
299 * feature, which is not supported by older versions of the controller.
301 static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
303 hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
304 value << __ffs(DEVICEADDR_USBADR));
308 * hw_usb_reset: restart device after a bus reset (execute without
311 * This function returns an error code
313 static int hw_usb_reset(struct ci_hdrc *ci)
315 hw_usb_set_address(ci, 0);
317 /* ESS flushes only at end?!? */
318 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
320 /* clear setup token semaphores */
321 hw_write(ci, OP_ENDPTSETUPSTAT, 0, 0);
323 /* clear complete status */
324 hw_write(ci, OP_ENDPTCOMPLETE, 0, 0);
326 /* wait until all bits cleared */
327 while (hw_read(ci, OP_ENDPTPRIME, ~0))
328 udelay(10); /* not RTOS friendly */
330 /* reset all endpoints ? */
332 /* reset internal status and wait for further instructions
333 no need to verify the port reset status (ESS does it) */
338 /******************************************************************************
340 *****************************************************************************/
342 static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
347 struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
353 node->ptr = dma_pool_zalloc(hwep->td_pool, GFP_ATOMIC, &node->dma);
354 if (node->ptr == NULL) {
359 node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
360 node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
361 node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
362 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
363 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
365 if (hwreq->req.length == 0
366 || hwreq->req.length % hwep->ep.maxpacket)
368 node->ptr->token |= mul << __ffs(TD_MULTO);
371 temp = (u32) (hwreq->req.dma + hwreq->req.actual);
373 node->ptr->page[0] = cpu_to_le32(temp);
374 for (i = 1; i < TD_PAGE_COUNT; i++) {
375 u32 page = temp + i * CI_HDRC_PAGE_SIZE;
376 page &= ~TD_RESERVED_MASK;
377 node->ptr->page[i] = cpu_to_le32(page);
381 hwreq->req.actual += length;
383 if (!list_empty(&hwreq->tds)) {
384 /* get the last entry */
385 lastnode = list_entry(hwreq->tds.prev,
387 lastnode->ptr->next = cpu_to_le32(node->dma);
390 INIT_LIST_HEAD(&node->td);
391 list_add_tail(&node->td, &hwreq->tds);
397 * _usb_addr: calculates endpoint address from direction & number
400 static inline u8 _usb_addr(struct ci_hw_ep *ep)
402 return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
406 * _hardware_enqueue: configures a request at hardware level
410 * This function returns an error code
412 static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
414 struct ci_hdrc *ci = hwep->ci;
416 unsigned rest = hwreq->req.length;
417 int pages = TD_PAGE_COUNT;
418 struct td_node *firstnode, *lastnode;
420 /* don't queue twice */
421 if (hwreq->req.status == -EALREADY)
424 hwreq->req.status = -EALREADY;
426 ret = usb_gadget_map_request(&ci->gadget, &hwreq->req, hwep->dir);
431 * The first buffer could be not page aligned.
432 * In that case we have to span into one extra td.
434 if (hwreq->req.dma % PAGE_SIZE)
438 ret = add_td_to_list(hwep, hwreq, 0);
444 unsigned count = min(hwreq->req.length - hwreq->req.actual,
445 (unsigned)(pages * CI_HDRC_PAGE_SIZE));
446 ret = add_td_to_list(hwep, hwreq, count);
453 if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
454 && (hwreq->req.length % hwep->ep.maxpacket == 0)) {
455 ret = add_td_to_list(hwep, hwreq, 0);
460 firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
462 lastnode = list_entry(hwreq->tds.prev,
465 lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
466 if (!hwreq->req.no_interrupt)
467 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
470 hwreq->req.actual = 0;
471 if (!list_empty(&hwep->qh.queue)) {
472 struct ci_hw_req *hwreqprev;
473 int n = hw_ep_bit(hwep->num, hwep->dir);
475 struct td_node *prevlastnode;
476 u32 next = firstnode->dma & TD_ADDR_MASK;
478 hwreqprev = list_entry(hwep->qh.queue.prev,
479 struct ci_hw_req, queue);
480 prevlastnode = list_entry(hwreqprev->tds.prev,
483 prevlastnode->ptr->next = cpu_to_le32(next);
485 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
488 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
489 tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
490 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
491 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
496 /* QH configuration */
497 hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
498 hwep->qh.ptr->td.token &=
499 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
501 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
502 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
504 if (hwreq->req.length == 0
505 || hwreq->req.length % hwep->ep.maxpacket)
507 hwep->qh.ptr->cap |= mul << __ffs(QH_MULT);
510 ret = hw_ep_prime(ci, hwep->num, hwep->dir,
511 hwep->type == USB_ENDPOINT_XFER_CONTROL);
517 * free_pending_td: remove a pending request for the endpoint
520 static void free_pending_td(struct ci_hw_ep *hwep)
522 struct td_node *pending = hwep->pending_td;
524 dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
525 hwep->pending_td = NULL;
529 static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
530 struct td_node *node)
532 hwep->qh.ptr->td.next = node->dma;
533 hwep->qh.ptr->td.token &=
534 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
536 return hw_ep_prime(ci, hwep->num, hwep->dir,
537 hwep->type == USB_ENDPOINT_XFER_CONTROL);
541 * _hardware_dequeue: handles a request at hardware level
545 * This function returns an error code
547 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
550 struct td_node *node, *tmpnode;
551 unsigned remaining_length;
552 unsigned actual = hwreq->req.length;
553 struct ci_hdrc *ci = hwep->ci;
555 if (hwreq->req.status != -EALREADY)
558 hwreq->req.status = 0;
560 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
561 tmptoken = le32_to_cpu(node->ptr->token);
562 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
563 int n = hw_ep_bit(hwep->num, hwep->dir);
565 if (ci->rev == CI_REVISION_24)
566 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
567 reprime_dtd(ci, hwep, node);
568 hwreq->req.status = -EALREADY;
572 remaining_length = (tmptoken & TD_TOTAL_BYTES);
573 remaining_length >>= __ffs(TD_TOTAL_BYTES);
574 actual -= remaining_length;
576 hwreq->req.status = tmptoken & TD_STATUS;
577 if ((TD_STATUS_HALTED & hwreq->req.status)) {
578 hwreq->req.status = -EPIPE;
580 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
581 hwreq->req.status = -EPROTO;
583 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
584 hwreq->req.status = -EILSEQ;
588 if (remaining_length) {
589 if (hwep->dir == TX) {
590 hwreq->req.status = -EPROTO;
595 * As the hardware could still address the freed td
596 * which will run the udc unusable, the cleanup of the
597 * td has to be delayed by one.
599 if (hwep->pending_td)
600 free_pending_td(hwep);
602 hwep->pending_td = node;
603 list_del_init(&node->td);
606 usb_gadget_unmap_request(&hwep->ci->gadget, &hwreq->req, hwep->dir);
608 hwreq->req.actual += actual;
610 if (hwreq->req.status)
611 return hwreq->req.status;
613 return hwreq->req.actual;
617 * _ep_nuke: dequeues all endpoint requests
620 * This function returns an error code
621 * Caller must hold lock
623 static int _ep_nuke(struct ci_hw_ep *hwep)
624 __releases(hwep->lock)
625 __acquires(hwep->lock)
627 struct td_node *node, *tmpnode;
631 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
633 while (!list_empty(&hwep->qh.queue)) {
635 /* pop oldest request */
636 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
637 struct ci_hw_req, queue);
639 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
640 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
641 list_del_init(&node->td);
646 list_del_init(&hwreq->queue);
647 hwreq->req.status = -ESHUTDOWN;
649 if (hwreq->req.complete != NULL) {
650 spin_unlock(hwep->lock);
651 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
652 spin_lock(hwep->lock);
656 if (hwep->pending_td)
657 free_pending_td(hwep);
662 static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
664 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
665 int direction, retval = 0;
668 if (ep == NULL || hwep->ep.desc == NULL)
671 if (usb_endpoint_xfer_isoc(hwep->ep.desc))
674 spin_lock_irqsave(hwep->lock, flags);
676 if (value && hwep->dir == TX && check_transfer &&
677 !list_empty(&hwep->qh.queue) &&
678 !usb_endpoint_xfer_control(hwep->ep.desc)) {
679 spin_unlock_irqrestore(hwep->lock, flags);
683 direction = hwep->dir;
685 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
690 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
691 hwep->dir = (hwep->dir == TX) ? RX : TX;
693 } while (hwep->dir != direction);
695 spin_unlock_irqrestore(hwep->lock, flags);
701 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
704 * This function returns an error code
706 static int _gadget_stop_activity(struct usb_gadget *gadget)
709 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
712 /* flush all endpoints */
713 gadget_for_each_ep(ep, gadget) {
714 usb_ep_fifo_flush(ep);
716 usb_ep_fifo_flush(&ci->ep0out->ep);
717 usb_ep_fifo_flush(&ci->ep0in->ep);
719 /* make sure to disable all endpoints */
720 gadget_for_each_ep(ep, gadget) {
724 if (ci->status != NULL) {
725 usb_ep_free_request(&ci->ep0in->ep, ci->status);
729 spin_lock_irqsave(&ci->lock, flags);
730 ci->gadget.speed = USB_SPEED_UNKNOWN;
731 ci->remote_wakeup = 0;
733 spin_unlock_irqrestore(&ci->lock, flags);
738 /******************************************************************************
740 *****************************************************************************/
742 * isr_reset_handler: USB reset interrupt handler
745 * This function resets USB engine after a bus reset occurred
747 static void isr_reset_handler(struct ci_hdrc *ci)
753 spin_unlock(&ci->lock);
754 if (ci->gadget.speed != USB_SPEED_UNKNOWN)
755 usb_gadget_udc_reset(&ci->gadget, ci->driver);
757 retval = _gadget_stop_activity(&ci->gadget);
761 retval = hw_usb_reset(ci);
765 ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
766 if (ci->status == NULL)
770 spin_lock(&ci->lock);
773 dev_err(ci->dev, "error: %i\n", retval);
777 * isr_get_status_complete: get_status request complete function
779 * @req: request handled
781 * Caller must release lock
783 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
785 if (ep == NULL || req == NULL)
789 usb_ep_free_request(ep, req);
793 * _ep_queue: queues (submits) an I/O request to an endpoint
796 * @gfp_flags: GFP flags (not used)
798 * Caller must hold lock
799 * This function returns an error code
801 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
802 gfp_t __maybe_unused gfp_flags)
804 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
805 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
806 struct ci_hdrc *ci = hwep->ci;
809 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
812 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
814 hwep = (ci->ep0_dir == RX) ?
815 ci->ep0out : ci->ep0in;
816 if (!list_empty(&hwep->qh.queue)) {
818 dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
823 if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
824 hwreq->req.length > (1 + hwep->ep.mult) * hwep->ep.maxpacket) {
825 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
829 /* first nuke then test link, e.g. previous status has not sent */
830 if (!list_empty(&hwreq->queue)) {
831 dev_err(hwep->ci->dev, "request already in queue\n");
836 hwreq->req.status = -EINPROGRESS;
837 hwreq->req.actual = 0;
839 retval = _hardware_enqueue(hwep, hwreq);
841 if (retval == -EALREADY)
844 list_add_tail(&hwreq->queue, &hwep->qh.queue);
850 * isr_get_status_response: get_status request response
852 * @setup: setup request packet
854 * This function returns an error code
856 static int isr_get_status_response(struct ci_hdrc *ci,
857 struct usb_ctrlrequest *setup)
858 __releases(hwep->lock)
859 __acquires(hwep->lock)
861 struct ci_hw_ep *hwep = ci->ep0in;
862 struct usb_request *req = NULL;
863 gfp_t gfp_flags = GFP_ATOMIC;
864 int dir, num, retval;
866 if (hwep == NULL || setup == NULL)
869 spin_unlock(hwep->lock);
870 req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
871 spin_lock(hwep->lock);
875 req->complete = isr_get_status_complete;
877 req->buf = kzalloc(req->length, gfp_flags);
878 if (req->buf == NULL) {
883 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
884 *(u16 *)req->buf = (ci->remote_wakeup << 1) |
885 ci->gadget.is_selfpowered;
886 } else if ((setup->bRequestType & USB_RECIP_MASK) \
887 == USB_RECIP_ENDPOINT) {
888 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
890 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
891 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
893 /* else do nothing; reserved for future use */
895 retval = _ep_queue(&hwep->ep, req, gfp_flags);
904 spin_unlock(hwep->lock);
905 usb_ep_free_request(&hwep->ep, req);
906 spin_lock(hwep->lock);
911 * isr_setup_status_complete: setup_status request complete function
913 * @req: request handled
915 * Caller must release lock. Put the port in test mode if test mode
916 * feature is selected.
919 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
921 struct ci_hdrc *ci = req->context;
928 hw_usb_set_address(ci, ci->address);
931 usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
934 spin_lock_irqsave(&ci->lock, flags);
936 hw_port_test_set(ci, ci->test_mode);
937 spin_unlock_irqrestore(&ci->lock, flags);
941 * isr_setup_status_phase: queues the status phase of a setup transation
944 * This function returns an error code
946 static int isr_setup_status_phase(struct ci_hdrc *ci)
949 struct ci_hw_ep *hwep;
952 * Unexpected USB controller behavior, caused by bad signal integrity
953 * or ground reference problems, can lead to isr_setup_status_phase
954 * being called with ci->status equal to NULL.
955 * If this situation occurs, you should review your USB hardware design.
957 if (WARN_ON_ONCE(!ci->status))
960 hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
961 ci->status->context = ci;
962 ci->status->complete = isr_setup_status_complete;
964 retval = _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
970 * isr_tr_complete_low: transaction complete low level handler
973 * This function returns an error code
974 * Caller must hold lock
976 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
977 __releases(hwep->lock)
978 __acquires(hwep->lock)
980 struct ci_hw_req *hwreq, *hwreqtemp;
981 struct ci_hw_ep *hweptemp = hwep;
984 list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
986 retval = _hardware_dequeue(hwep, hwreq);
989 list_del_init(&hwreq->queue);
990 if (hwreq->req.complete != NULL) {
991 spin_unlock(hwep->lock);
992 if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
994 hweptemp = hwep->ci->ep0in;
995 usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
996 spin_lock(hwep->lock);
1000 if (retval == -EBUSY)
1006 static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
1008 dev_warn(&ci->gadget.dev,
1009 "connect the device to an alternate port if you want HNP\n");
1010 return isr_setup_status_phase(ci);
1014 * isr_setup_packet_handler: setup packet handler
1015 * @ci: UDC descriptor
1017 * This function handles setup packet
1019 static void isr_setup_packet_handler(struct ci_hdrc *ci)
1020 __releases(ci->lock)
1021 __acquires(ci->lock)
1023 struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1024 struct usb_ctrlrequest req;
1025 int type, num, dir, err = -EINVAL;
1029 * Flush data and handshake transactions of previous
1032 _ep_nuke(ci->ep0out);
1033 _ep_nuke(ci->ep0in);
1035 /* read_setup_packet */
1037 hw_test_and_set_setup_guard(ci);
1038 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1039 } while (!hw_test_and_clear_setup_guard(ci));
1041 type = req.bRequestType;
1043 ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1045 switch (req.bRequest) {
1046 case USB_REQ_CLEAR_FEATURE:
1047 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1048 le16_to_cpu(req.wValue) ==
1049 USB_ENDPOINT_HALT) {
1050 if (req.wLength != 0)
1052 num = le16_to_cpu(req.wIndex);
1053 dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1054 num &= USB_ENDPOINT_NUMBER_MASK;
1056 num += ci->hw_ep_max / 2;
1057 if (!ci->ci_hw_ep[num].wedge) {
1058 spin_unlock(&ci->lock);
1059 err = usb_ep_clear_halt(
1060 &ci->ci_hw_ep[num].ep);
1061 spin_lock(&ci->lock);
1065 err = isr_setup_status_phase(ci);
1066 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1067 le16_to_cpu(req.wValue) ==
1068 USB_DEVICE_REMOTE_WAKEUP) {
1069 if (req.wLength != 0)
1071 ci->remote_wakeup = 0;
1072 err = isr_setup_status_phase(ci);
1077 case USB_REQ_GET_STATUS:
1078 if ((type != (USB_DIR_IN|USB_RECIP_DEVICE) ||
1079 le16_to_cpu(req.wIndex) == OTG_STS_SELECTOR) &&
1080 type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1081 type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1083 if (le16_to_cpu(req.wLength) != 2 ||
1084 le16_to_cpu(req.wValue) != 0)
1086 err = isr_get_status_response(ci, &req);
1088 case USB_REQ_SET_ADDRESS:
1089 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1091 if (le16_to_cpu(req.wLength) != 0 ||
1092 le16_to_cpu(req.wIndex) != 0)
1094 ci->address = (u8)le16_to_cpu(req.wValue);
1096 err = isr_setup_status_phase(ci);
1098 case USB_REQ_SET_FEATURE:
1099 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1100 le16_to_cpu(req.wValue) ==
1101 USB_ENDPOINT_HALT) {
1102 if (req.wLength != 0)
1104 num = le16_to_cpu(req.wIndex);
1105 dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1106 num &= USB_ENDPOINT_NUMBER_MASK;
1108 num += ci->hw_ep_max / 2;
1110 spin_unlock(&ci->lock);
1111 err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1112 spin_lock(&ci->lock);
1114 isr_setup_status_phase(ci);
1115 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1116 if (req.wLength != 0)
1118 switch (le16_to_cpu(req.wValue)) {
1119 case USB_DEVICE_REMOTE_WAKEUP:
1120 ci->remote_wakeup = 1;
1121 err = isr_setup_status_phase(ci);
1123 case USB_DEVICE_TEST_MODE:
1124 tmode = le16_to_cpu(req.wIndex) >> 8;
1131 ci->test_mode = tmode;
1132 err = isr_setup_status_phase(
1139 case USB_DEVICE_B_HNP_ENABLE:
1140 if (ci_otg_is_fsm_mode(ci)) {
1141 ci->gadget.b_hnp_enable = 1;
1142 err = isr_setup_status_phase(
1146 case USB_DEVICE_A_ALT_HNP_SUPPORT:
1147 if (ci_otg_is_fsm_mode(ci))
1148 err = otg_a_alt_hnp_support(ci);
1150 case USB_DEVICE_A_HNP_SUPPORT:
1151 if (ci_otg_is_fsm_mode(ci)) {
1152 ci->gadget.a_hnp_support = 1;
1153 err = isr_setup_status_phase(
1166 if (req.wLength == 0) /* no data phase */
1169 spin_unlock(&ci->lock);
1170 err = ci->driver->setup(&ci->gadget, &req);
1171 spin_lock(&ci->lock);
1176 spin_unlock(&ci->lock);
1177 if (_ep_set_halt(&hwep->ep, 1, false))
1178 dev_err(ci->dev, "error: _ep_set_halt\n");
1179 spin_lock(&ci->lock);
1184 * isr_tr_complete_handler: transaction complete interrupt handler
1185 * @ci: UDC descriptor
1187 * This function handles traffic events
1189 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1190 __releases(ci->lock)
1191 __acquires(ci->lock)
1196 for (i = 0; i < ci->hw_ep_max; i++) {
1197 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1199 if (hwep->ep.desc == NULL)
1200 continue; /* not configured */
1202 if (hw_test_and_clear_complete(ci, i)) {
1203 err = isr_tr_complete_low(hwep);
1204 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1205 if (err > 0) /* needs status phase */
1206 err = isr_setup_status_phase(ci);
1208 spin_unlock(&ci->lock);
1209 if (_ep_set_halt(&hwep->ep, 1, false))
1211 "error: _ep_set_halt\n");
1212 spin_lock(&ci->lock);
1217 /* Only handle setup packet below */
1219 hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1220 isr_setup_packet_handler(ci);
1224 /******************************************************************************
1226 *****************************************************************************/
1228 * ep_enable: configure endpoint, making it usable
1230 * Check usb_ep_enable() at "usb_gadget.h" for details
1232 static int ep_enable(struct usb_ep *ep,
1233 const struct usb_endpoint_descriptor *desc)
1235 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1237 unsigned long flags;
1240 if (ep == NULL || desc == NULL)
1243 spin_lock_irqsave(hwep->lock, flags);
1245 /* only internal SW should enable ctrl endpts */
1247 if (!list_empty(&hwep->qh.queue)) {
1248 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1249 spin_unlock_irqrestore(hwep->lock, flags);
1253 hwep->ep.desc = desc;
1255 hwep->dir = usb_endpoint_dir_in(desc) ? TX : RX;
1256 hwep->num = usb_endpoint_num(desc);
1257 hwep->type = usb_endpoint_type(desc);
1259 hwep->ep.maxpacket = usb_endpoint_maxp(desc) & 0x07ff;
1260 hwep->ep.mult = QH_ISO_MULT(usb_endpoint_maxp(desc));
1262 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1266 cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1268 * For ISO-TX, we set mult at QH as the largest value, and use
1269 * MultO at TD as real mult value.
1271 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1272 cap |= 3 << __ffs(QH_MULT);
1274 hwep->qh.ptr->cap = cpu_to_le32(cap);
1276 hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE); /* needed? */
1278 if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1279 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1284 * Enable endpoints in the HW other than ep0 as ep0
1288 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1291 spin_unlock_irqrestore(hwep->lock, flags);
1296 * ep_disable: endpoint is no longer usable
1298 * Check usb_ep_disable() at "usb_gadget.h" for details
1300 static int ep_disable(struct usb_ep *ep)
1302 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1303 int direction, retval = 0;
1304 unsigned long flags;
1308 else if (hwep->ep.desc == NULL)
1311 spin_lock_irqsave(hwep->lock, flags);
1312 if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1313 spin_unlock_irqrestore(hwep->lock, flags);
1317 /* only internal SW should disable ctrl endpts */
1319 direction = hwep->dir;
1321 retval |= _ep_nuke(hwep);
1322 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1324 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1325 hwep->dir = (hwep->dir == TX) ? RX : TX;
1327 } while (hwep->dir != direction);
1329 hwep->ep.desc = NULL;
1331 spin_unlock_irqrestore(hwep->lock, flags);
1336 * ep_alloc_request: allocate a request object to use with this endpoint
1338 * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1340 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1342 struct ci_hw_req *hwreq = NULL;
1347 hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1348 if (hwreq != NULL) {
1349 INIT_LIST_HEAD(&hwreq->queue);
1350 INIT_LIST_HEAD(&hwreq->tds);
1353 return (hwreq == NULL) ? NULL : &hwreq->req;
1357 * ep_free_request: frees a request object
1359 * Check usb_ep_free_request() at "usb_gadget.h" for details
1361 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1363 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1364 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1365 struct td_node *node, *tmpnode;
1366 unsigned long flags;
1368 if (ep == NULL || req == NULL) {
1370 } else if (!list_empty(&hwreq->queue)) {
1371 dev_err(hwep->ci->dev, "freeing queued request\n");
1375 spin_lock_irqsave(hwep->lock, flags);
1377 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1378 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1379 list_del_init(&node->td);
1386 spin_unlock_irqrestore(hwep->lock, flags);
1390 * ep_queue: queues (submits) an I/O request to an endpoint
1392 * Check usb_ep_queue()* at usb_gadget.h" for details
1394 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1395 gfp_t __maybe_unused gfp_flags)
1397 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1399 unsigned long flags;
1401 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1404 spin_lock_irqsave(hwep->lock, flags);
1405 if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1406 spin_unlock_irqrestore(hwep->lock, flags);
1409 retval = _ep_queue(ep, req, gfp_flags);
1410 spin_unlock_irqrestore(hwep->lock, flags);
1415 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1417 * Check usb_ep_dequeue() at "usb_gadget.h" for details
1419 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1421 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1422 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1423 unsigned long flags;
1424 struct td_node *node, *tmpnode;
1426 if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1427 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1428 list_empty(&hwep->qh.queue))
1431 spin_lock_irqsave(hwep->lock, flags);
1432 if (hwep->ci->gadget.speed != USB_SPEED_UNKNOWN)
1433 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1435 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1436 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1437 list_del(&node->td);
1442 list_del_init(&hwreq->queue);
1444 usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1446 req->status = -ECONNRESET;
1448 if (hwreq->req.complete != NULL) {
1449 spin_unlock(hwep->lock);
1450 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1451 spin_lock(hwep->lock);
1454 spin_unlock_irqrestore(hwep->lock, flags);
1459 * ep_set_halt: sets the endpoint halt feature
1461 * Check usb_ep_set_halt() at "usb_gadget.h" for details
1463 static int ep_set_halt(struct usb_ep *ep, int value)
1465 return _ep_set_halt(ep, value, true);
1469 * ep_set_wedge: sets the halt feature and ignores clear requests
1471 * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1473 static int ep_set_wedge(struct usb_ep *ep)
1475 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1476 unsigned long flags;
1478 if (ep == NULL || hwep->ep.desc == NULL)
1481 spin_lock_irqsave(hwep->lock, flags);
1483 spin_unlock_irqrestore(hwep->lock, flags);
1485 return usb_ep_set_halt(ep);
1489 * ep_fifo_flush: flushes contents of a fifo
1491 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1493 static void ep_fifo_flush(struct usb_ep *ep)
1495 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1496 unsigned long flags;
1499 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1503 spin_lock_irqsave(hwep->lock, flags);
1504 if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1505 spin_unlock_irqrestore(hwep->lock, flags);
1509 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1511 spin_unlock_irqrestore(hwep->lock, flags);
1515 * Endpoint-specific part of the API to the USB controller hardware
1516 * Check "usb_gadget.h" for details
1518 static const struct usb_ep_ops usb_ep_ops = {
1519 .enable = ep_enable,
1520 .disable = ep_disable,
1521 .alloc_request = ep_alloc_request,
1522 .free_request = ep_free_request,
1524 .dequeue = ep_dequeue,
1525 .set_halt = ep_set_halt,
1526 .set_wedge = ep_set_wedge,
1527 .fifo_flush = ep_fifo_flush,
1530 /******************************************************************************
1532 *****************************************************************************/
1533 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1535 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1536 unsigned long flags;
1537 int gadget_ready = 0;
1539 spin_lock_irqsave(&ci->lock, flags);
1540 ci->vbus_active = is_active;
1543 spin_unlock_irqrestore(&ci->lock, flags);
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 unsigned long flags;
1768 int retval = -ENOMEM;
1770 if (driver->disconnect == NULL)
1774 ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1775 retval = usb_ep_enable(&ci->ep0out->ep);
1779 ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1780 retval = usb_ep_enable(&ci->ep0in->ep);
1784 ci->driver = driver;
1786 /* Start otg fsm for B-device */
1787 if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1788 ci_hdrc_otg_fsm_start(ci);
1792 pm_runtime_get_sync(&ci->gadget.dev);
1793 if (ci->vbus_active) {
1794 spin_lock_irqsave(&ci->lock, flags);
1795 hw_device_reset(ci);
1797 usb_udc_vbus_handler(&ci->gadget, false);
1798 pm_runtime_put_sync(&ci->gadget.dev);
1802 retval = hw_device_state(ci, ci->ep0out->qh.dma);
1803 spin_unlock_irqrestore(&ci->lock, flags);
1805 pm_runtime_put_sync(&ci->gadget.dev);
1810 static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
1812 if (!ci_otg_is_fsm_mode(ci))
1815 mutex_lock(&ci->fsm.lock);
1816 if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
1817 ci->fsm.a_bidl_adis_tmout = 1;
1818 ci_hdrc_otg_fsm_start(ci);
1819 } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
1820 ci->fsm.protocol = PROTO_UNDEF;
1821 ci->fsm.otg->state = OTG_STATE_UNDEFINED;
1823 mutex_unlock(&ci->fsm.lock);
1827 * ci_udc_stop: unregister a gadget driver
1829 static int ci_udc_stop(struct usb_gadget *gadget)
1831 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1832 unsigned long flags;
1834 spin_lock_irqsave(&ci->lock, flags);
1836 if (ci->vbus_active) {
1837 hw_device_state(ci, 0);
1838 if (ci->platdata->notify_event)
1839 ci->platdata->notify_event(ci,
1840 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1841 spin_unlock_irqrestore(&ci->lock, flags);
1842 _gadget_stop_activity(&ci->gadget);
1843 spin_lock_irqsave(&ci->lock, flags);
1844 pm_runtime_put(&ci->gadget.dev);
1848 spin_unlock_irqrestore(&ci->lock, flags);
1850 ci_udc_stop_for_otg_fsm(ci);
1854 /******************************************************************************
1856 *****************************************************************************/
1858 * udc_irq: ci interrupt handler
1860 * This function returns IRQ_HANDLED if the IRQ has been handled
1861 * It locks access to registers
1863 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1871 spin_lock(&ci->lock);
1873 if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1874 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1876 spin_unlock(&ci->lock);
1880 intr = hw_test_and_clear_intr_active(ci);
1883 /* order defines priority - do NOT change it */
1884 if (USBi_URI & intr)
1885 isr_reset_handler(ci);
1887 if (USBi_PCI & intr) {
1888 ci->gadget.speed = hw_port_is_high_speed(ci) ?
1889 USB_SPEED_HIGH : USB_SPEED_FULL;
1890 if (ci->suspended && ci->driver->resume) {
1891 spin_unlock(&ci->lock);
1892 ci->driver->resume(&ci->gadget);
1893 spin_lock(&ci->lock);
1899 isr_tr_complete_handler(ci);
1901 if (USBi_SLI & intr) {
1902 if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1903 ci->driver->suspend) {
1905 spin_unlock(&ci->lock);
1906 ci->driver->suspend(&ci->gadget);
1907 usb_gadget_set_state(&ci->gadget,
1908 USB_STATE_SUSPENDED);
1909 spin_lock(&ci->lock);
1912 retval = IRQ_HANDLED;
1916 spin_unlock(&ci->lock);
1922 * udc_start: initialize gadget role
1923 * @ci: chipidea controller
1925 static int udc_start(struct ci_hdrc *ci)
1927 struct device *dev = ci->dev;
1928 struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
1931 ci->gadget.ops = &usb_gadget_ops;
1932 ci->gadget.speed = USB_SPEED_UNKNOWN;
1933 ci->gadget.max_speed = USB_SPEED_HIGH;
1934 ci->gadget.name = ci->platdata->name;
1935 ci->gadget.otg_caps = otg_caps;
1937 if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
1938 otg_caps->adp_support))
1939 ci->gadget.is_otg = 1;
1941 INIT_LIST_HEAD(&ci->gadget.ep_list);
1943 /* alloc resources */
1944 ci->qh_pool = dma_pool_create("ci_hw_qh", dev,
1945 sizeof(struct ci_hw_qh),
1946 64, CI_HDRC_PAGE_SIZE);
1947 if (ci->qh_pool == NULL)
1950 ci->td_pool = dma_pool_create("ci_hw_td", dev,
1951 sizeof(struct ci_hw_td),
1952 64, CI_HDRC_PAGE_SIZE);
1953 if (ci->td_pool == NULL) {
1958 retval = init_eps(ci);
1962 ci->gadget.ep0 = &ci->ep0in->ep;
1964 retval = usb_add_gadget_udc(dev, &ci->gadget);
1968 pm_runtime_no_callbacks(&ci->gadget.dev);
1969 pm_runtime_enable(&ci->gadget.dev);
1976 dma_pool_destroy(ci->td_pool);
1978 dma_pool_destroy(ci->qh_pool);
1983 * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1985 * No interrupts active, the IRQ has been released
1987 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1989 if (!ci->roles[CI_ROLE_GADGET])
1992 usb_del_gadget_udc(&ci->gadget);
1996 dma_pool_destroy(ci->td_pool);
1997 dma_pool_destroy(ci->qh_pool);
2000 static int udc_id_switch_for_device(struct ci_hdrc *ci)
2003 /* Clear and enable BSV irq */
2004 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
2005 OTGSC_BSVIS | OTGSC_BSVIE);
2010 static void udc_id_switch_for_host(struct ci_hdrc *ci)
2013 * host doesn't care B_SESSION_VALID event
2014 * so clear and disbale BSV irq
2017 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
2021 * ci_hdrc_gadget_init - initialize device related bits
2022 * ci: the controller
2024 * This function initializes the gadget, if the device is "device capable".
2026 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
2028 struct ci_role_driver *rdrv;
2031 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
2034 rdrv = devm_kzalloc(ci->dev, sizeof(*rdrv), GFP_KERNEL);
2038 rdrv->start = udc_id_switch_for_device;
2039 rdrv->stop = udc_id_switch_for_host;
2040 rdrv->irq = udc_irq;
2041 rdrv->name = "gadget";
2043 ret = udc_start(ci);
2045 ci->roles[CI_ROLE_GADGET] = rdrv;