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>
33 /* control endpoint description */
34 static const struct usb_endpoint_descriptor
35 ctrl_endpt_out_desc = {
36 .bLength = USB_DT_ENDPOINT_SIZE,
37 .bDescriptorType = USB_DT_ENDPOINT,
39 .bEndpointAddress = USB_DIR_OUT,
40 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
41 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
44 static const struct usb_endpoint_descriptor
45 ctrl_endpt_in_desc = {
46 .bLength = USB_DT_ENDPOINT_SIZE,
47 .bDescriptorType = USB_DT_ENDPOINT,
49 .bEndpointAddress = USB_DIR_IN,
50 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
51 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
55 * hw_ep_bit: calculates the bit number
56 * @num: endpoint number
57 * @dir: endpoint direction
59 * This function returns bit number
61 static inline int hw_ep_bit(int num, int dir)
63 return num + (dir ? 16 : 0);
66 static inline int ep_to_bit(struct ci_hdrc *ci, int n)
68 int fill = 16 - ci->hw_ep_max / 2;
70 if (n >= ci->hw_ep_max / 2)
77 * hw_device_state: enables/disables interrupts (execute without interruption)
78 * @dma: 0 => disable, !0 => enable and set dma engine
80 * This function returns an error code
82 static int hw_device_state(struct ci_hdrc *ci, u32 dma)
85 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
86 /* interrupt, error, port change, reset, sleep/suspend */
87 hw_write(ci, OP_USBINTR, ~0,
88 USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
89 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
91 hw_write(ci, OP_USBINTR, ~0, 0);
92 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
98 * hw_ep_flush: flush endpoint fifo (execute without interruption)
99 * @num: endpoint number
100 * @dir: endpoint direction
102 * This function returns an error code
104 static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
106 int n = hw_ep_bit(num, dir);
109 /* flush any pending transfer */
110 hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
111 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
113 } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
119 * hw_ep_disable: disables endpoint (execute without interruption)
120 * @num: endpoint number
121 * @dir: endpoint direction
123 * This function returns an error code
125 static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
127 hw_ep_flush(ci, num, dir);
128 hw_write(ci, OP_ENDPTCTRL + num,
129 dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
134 * hw_ep_enable: enables endpoint (execute without interruption)
135 * @num: endpoint number
136 * @dir: endpoint direction
137 * @type: endpoint type
139 * This function returns an error code
141 static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
146 mask = ENDPTCTRL_TXT; /* type */
147 data = type << __ffs(mask);
149 mask |= ENDPTCTRL_TXS; /* unstall */
150 mask |= ENDPTCTRL_TXR; /* reset data toggle */
151 data |= ENDPTCTRL_TXR;
152 mask |= ENDPTCTRL_TXE; /* enable */
153 data |= ENDPTCTRL_TXE;
155 mask = ENDPTCTRL_RXT; /* type */
156 data = type << __ffs(mask);
158 mask |= ENDPTCTRL_RXS; /* unstall */
159 mask |= ENDPTCTRL_RXR; /* reset data toggle */
160 data |= ENDPTCTRL_RXR;
161 mask |= ENDPTCTRL_RXE; /* enable */
162 data |= ENDPTCTRL_RXE;
164 hw_write(ci, OP_ENDPTCTRL + num, mask, data);
169 * hw_ep_get_halt: return endpoint halt status
170 * @num: endpoint number
171 * @dir: endpoint direction
173 * This function returns 1 if endpoint halted
175 static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
177 u32 mask = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
179 return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
183 * hw_ep_prime: primes endpoint (execute without interruption)
184 * @num: endpoint number
185 * @dir: endpoint direction
186 * @is_ctrl: true if control endpoint
188 * This function returns an error code
190 static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
192 int n = hw_ep_bit(num, dir);
194 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
197 hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
199 while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
201 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
204 /* status shoult be tested according with manual but it doesn't work */
209 * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
210 * without interruption)
211 * @num: endpoint number
212 * @dir: endpoint direction
213 * @value: true => stall, false => unstall
215 * This function returns an error code
217 static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
219 if (value != 0 && value != 1)
223 enum ci_hw_regs reg = OP_ENDPTCTRL + num;
224 u32 mask_xs = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
225 u32 mask_xr = dir ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
227 /* data toggle - reserved for EP0 but it's in ESS */
228 hw_write(ci, reg, mask_xs|mask_xr,
229 value ? mask_xs : mask_xr);
230 } while (value != hw_ep_get_halt(ci, num, dir));
236 * hw_is_port_high_speed: test if port is high speed
238 * This function returns true if high speed port
240 static int hw_port_is_high_speed(struct ci_hdrc *ci)
242 return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
243 hw_read(ci, OP_PORTSC, PORTSC_HSP);
247 * hw_test_and_clear_complete: test & clear complete status (execute without
249 * @n: endpoint number
251 * This function returns complete status
253 static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
255 n = ep_to_bit(ci, n);
256 return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
260 * hw_test_and_clear_intr_active: test & clear active interrupts (execute
261 * without interruption)
263 * This function returns active interrutps
265 static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
267 u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
269 hw_write(ci, OP_USBSTS, ~0, reg);
274 * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
277 * This function returns guard value
279 static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
281 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
285 * hw_test_and_set_setup_guard: test & set setup guard (execute without
288 * This function returns guard value
290 static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
292 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
296 * hw_usb_set_address: configures USB address (execute without interruption)
297 * @value: new USB address
299 * This function explicitly sets the address, without the "USBADRA" (advance)
300 * feature, which is not supported by older versions of the controller.
302 static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
304 hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
305 value << __ffs(DEVICEADDR_USBADR));
309 * hw_usb_reset: restart device after a bus reset (execute without
312 * This function returns an error code
314 static int hw_usb_reset(struct ci_hdrc *ci)
316 hw_usb_set_address(ci, 0);
318 /* ESS flushes only at end?!? */
319 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
321 /* clear setup token semaphores */
322 hw_write(ci, OP_ENDPTSETUPSTAT, 0, 0);
324 /* clear complete status */
325 hw_write(ci, OP_ENDPTCOMPLETE, 0, 0);
327 /* wait until all bits cleared */
328 while (hw_read(ci, OP_ENDPTPRIME, ~0))
329 udelay(10); /* not RTOS friendly */
331 /* reset all endpoints ? */
333 /* reset internal status and wait for further instructions
334 no need to verify the port reset status (ESS does it) */
339 /******************************************************************************
341 *****************************************************************************/
343 static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
348 struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
354 node->ptr = dma_pool_alloc(hwep->td_pool, GFP_ATOMIC,
356 if (node->ptr == NULL) {
361 memset(node->ptr, 0, sizeof(struct ci_hw_td));
362 node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
363 node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
364 node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
365 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
366 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
368 if (hwreq->req.length == 0
369 || hwreq->req.length % hwep->ep.maxpacket)
371 node->ptr->token |= mul << __ffs(TD_MULTO);
374 temp = (u32) (hwreq->req.dma + hwreq->req.actual);
376 node->ptr->page[0] = cpu_to_le32(temp);
377 for (i = 1; i < TD_PAGE_COUNT; i++) {
378 u32 page = temp + i * CI_HDRC_PAGE_SIZE;
379 page &= ~TD_RESERVED_MASK;
380 node->ptr->page[i] = cpu_to_le32(page);
384 hwreq->req.actual += length;
386 if (!list_empty(&hwreq->tds)) {
387 /* get the last entry */
388 lastnode = list_entry(hwreq->tds.prev,
390 lastnode->ptr->next = cpu_to_le32(node->dma);
393 INIT_LIST_HEAD(&node->td);
394 list_add_tail(&node->td, &hwreq->tds);
400 * _usb_addr: calculates endpoint address from direction & number
403 static inline u8 _usb_addr(struct ci_hw_ep *ep)
405 return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
409 * _hardware_queue: configures a request at hardware level
413 * This function returns an error code
415 static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
417 struct ci_hdrc *ci = hwep->ci;
419 unsigned rest = hwreq->req.length;
420 int pages = TD_PAGE_COUNT;
421 struct td_node *firstnode, *lastnode;
423 /* don't queue twice */
424 if (hwreq->req.status == -EALREADY)
427 hwreq->req.status = -EALREADY;
429 ret = usb_gadget_map_request(&ci->gadget, &hwreq->req, hwep->dir);
434 * The first buffer could be not page aligned.
435 * In that case we have to span into one extra td.
437 if (hwreq->req.dma % PAGE_SIZE)
441 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 add_td_to_list(hwep, hwreq, count);
450 if (hwreq->req.zero && hwreq->req.length
451 && (hwreq->req.length % hwep->ep.maxpacket == 0))
452 add_td_to_list(hwep, hwreq, 0);
454 firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
456 lastnode = list_entry(hwreq->tds.prev,
459 lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
460 if (!hwreq->req.no_interrupt)
461 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
464 hwreq->req.actual = 0;
465 if (!list_empty(&hwep->qh.queue)) {
466 struct ci_hw_req *hwreqprev;
467 int n = hw_ep_bit(hwep->num, hwep->dir);
469 struct td_node *prevlastnode;
470 u32 next = firstnode->dma & TD_ADDR_MASK;
472 hwreqprev = list_entry(hwep->qh.queue.prev,
473 struct ci_hw_req, queue);
474 prevlastnode = list_entry(hwreqprev->tds.prev,
477 prevlastnode->ptr->next = cpu_to_le32(next);
479 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
482 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
483 tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
484 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
485 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
490 /* QH configuration */
491 hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
492 hwep->qh.ptr->td.token &=
493 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
495 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
496 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
498 if (hwreq->req.length == 0
499 || hwreq->req.length % hwep->ep.maxpacket)
501 hwep->qh.ptr->cap |= mul << __ffs(QH_MULT);
504 wmb(); /* synchronize before ep prime */
506 ret = hw_ep_prime(ci, hwep->num, hwep->dir,
507 hwep->type == USB_ENDPOINT_XFER_CONTROL);
513 * free_pending_td: remove a pending request for the endpoint
516 static void free_pending_td(struct ci_hw_ep *hwep)
518 struct td_node *pending = hwep->pending_td;
520 dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
521 hwep->pending_td = NULL;
526 * _hardware_dequeue: handles a request at hardware level
530 * This function returns an error code
532 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
535 struct td_node *node, *tmpnode;
536 unsigned remaining_length;
537 unsigned actual = hwreq->req.length;
539 if (hwreq->req.status != -EALREADY)
542 hwreq->req.status = 0;
544 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
545 tmptoken = le32_to_cpu(node->ptr->token);
546 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
547 hwreq->req.status = -EALREADY;
551 remaining_length = (tmptoken & TD_TOTAL_BYTES);
552 remaining_length >>= __ffs(TD_TOTAL_BYTES);
553 actual -= remaining_length;
555 hwreq->req.status = tmptoken & TD_STATUS;
556 if ((TD_STATUS_HALTED & hwreq->req.status)) {
557 hwreq->req.status = -EPIPE;
559 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
560 hwreq->req.status = -EPROTO;
562 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
563 hwreq->req.status = -EILSEQ;
567 if (remaining_length) {
569 hwreq->req.status = -EPROTO;
574 * As the hardware could still address the freed td
575 * which will run the udc unusable, the cleanup of the
576 * td has to be delayed by one.
578 if (hwep->pending_td)
579 free_pending_td(hwep);
581 hwep->pending_td = node;
582 list_del_init(&node->td);
585 usb_gadget_unmap_request(&hwep->ci->gadget, &hwreq->req, hwep->dir);
587 hwreq->req.actual += actual;
589 if (hwreq->req.status)
590 return hwreq->req.status;
592 return hwreq->req.actual;
596 * _ep_nuke: dequeues all endpoint requests
599 * This function returns an error code
600 * Caller must hold lock
602 static int _ep_nuke(struct ci_hw_ep *hwep)
603 __releases(hwep->lock)
604 __acquires(hwep->lock)
606 struct td_node *node, *tmpnode;
610 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
612 while (!list_empty(&hwep->qh.queue)) {
614 /* pop oldest request */
615 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
616 struct ci_hw_req, queue);
618 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
619 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
620 list_del_init(&node->td);
625 list_del_init(&hwreq->queue);
626 hwreq->req.status = -ESHUTDOWN;
628 if (hwreq->req.complete != NULL) {
629 spin_unlock(hwep->lock);
630 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
631 spin_lock(hwep->lock);
635 if (hwep->pending_td)
636 free_pending_td(hwep);
642 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
645 * This function returns an error code
647 static int _gadget_stop_activity(struct usb_gadget *gadget)
650 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
653 spin_lock_irqsave(&ci->lock, flags);
654 ci->gadget.speed = USB_SPEED_UNKNOWN;
655 ci->remote_wakeup = 0;
657 spin_unlock_irqrestore(&ci->lock, flags);
659 /* flush all endpoints */
660 gadget_for_each_ep(ep, gadget) {
661 usb_ep_fifo_flush(ep);
663 usb_ep_fifo_flush(&ci->ep0out->ep);
664 usb_ep_fifo_flush(&ci->ep0in->ep);
666 /* make sure to disable all endpoints */
667 gadget_for_each_ep(ep, gadget) {
671 if (ci->status != NULL) {
672 usb_ep_free_request(&ci->ep0in->ep, ci->status);
679 /******************************************************************************
681 *****************************************************************************/
683 * isr_reset_handler: USB reset interrupt handler
686 * This function resets USB engine after a bus reset occurred
688 static void isr_reset_handler(struct ci_hdrc *ci)
694 spin_unlock(&ci->lock);
695 if (ci->gadget.speed != USB_SPEED_UNKNOWN) {
697 ci->driver->disconnect(&ci->gadget);
700 retval = _gadget_stop_activity(&ci->gadget);
704 retval = hw_usb_reset(ci);
708 ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
709 if (ci->status == NULL)
712 usb_gadget_set_state(&ci->gadget, USB_STATE_DEFAULT);
715 spin_lock(&ci->lock);
718 dev_err(ci->dev, "error: %i\n", retval);
722 * isr_get_status_complete: get_status request complete function
724 * @req: request handled
726 * Caller must release lock
728 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
730 if (ep == NULL || req == NULL)
734 usb_ep_free_request(ep, req);
738 * _ep_queue: queues (submits) an I/O request to an endpoint
740 * Caller must hold lock
742 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
743 gfp_t __maybe_unused gfp_flags)
745 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
746 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
747 struct ci_hdrc *ci = hwep->ci;
750 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
753 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
755 hwep = (ci->ep0_dir == RX) ?
756 ci->ep0out : ci->ep0in;
757 if (!list_empty(&hwep->qh.queue)) {
760 dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
765 if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
766 hwreq->req.length > (1 + hwep->ep.mult) * hwep->ep.maxpacket) {
767 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
771 /* first nuke then test link, e.g. previous status has not sent */
772 if (!list_empty(&hwreq->queue)) {
773 dev_err(hwep->ci->dev, "request already in queue\n");
778 hwreq->req.status = -EINPROGRESS;
779 hwreq->req.actual = 0;
781 retval = _hardware_enqueue(hwep, hwreq);
783 if (retval == -EALREADY)
786 list_add_tail(&hwreq->queue, &hwep->qh.queue);
792 * isr_get_status_response: get_status request response
794 * @setup: setup request packet
796 * This function returns an error code
798 static int isr_get_status_response(struct ci_hdrc *ci,
799 struct usb_ctrlrequest *setup)
800 __releases(hwep->lock)
801 __acquires(hwep->lock)
803 struct ci_hw_ep *hwep = ci->ep0in;
804 struct usb_request *req = NULL;
805 gfp_t gfp_flags = GFP_ATOMIC;
806 int dir, num, retval;
808 if (hwep == NULL || setup == NULL)
811 spin_unlock(hwep->lock);
812 req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
813 spin_lock(hwep->lock);
817 req->complete = isr_get_status_complete;
819 req->buf = kzalloc(req->length, gfp_flags);
820 if (req->buf == NULL) {
825 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
826 /* Assume that device is bus powered for now. */
827 *(u16 *)req->buf = ci->remote_wakeup << 1;
828 } else if ((setup->bRequestType & USB_RECIP_MASK) \
829 == USB_RECIP_ENDPOINT) {
830 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
832 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
833 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
835 /* else do nothing; reserved for future use */
837 retval = _ep_queue(&hwep->ep, req, gfp_flags);
846 spin_unlock(hwep->lock);
847 usb_ep_free_request(&hwep->ep, req);
848 spin_lock(hwep->lock);
853 * isr_setup_status_complete: setup_status request complete function
855 * @req: request handled
857 * Caller must release lock. Put the port in test mode if test mode
858 * feature is selected.
861 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
863 struct ci_hdrc *ci = req->context;
867 hw_usb_set_address(ci, ci->address);
870 usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
873 spin_lock_irqsave(&ci->lock, flags);
875 hw_port_test_set(ci, ci->test_mode);
876 spin_unlock_irqrestore(&ci->lock, flags);
880 * isr_setup_status_phase: queues the status phase of a setup transation
883 * This function returns an error code
885 static int isr_setup_status_phase(struct ci_hdrc *ci)
888 struct ci_hw_ep *hwep;
890 hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
891 ci->status->context = ci;
892 ci->status->complete = isr_setup_status_complete;
894 retval = _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
900 * isr_tr_complete_low: transaction complete low level handler
903 * This function returns an error code
904 * Caller must hold lock
906 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
907 __releases(hwep->lock)
908 __acquires(hwep->lock)
910 struct ci_hw_req *hwreq, *hwreqtemp;
911 struct ci_hw_ep *hweptemp = hwep;
914 list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
916 retval = _hardware_dequeue(hwep, hwreq);
919 list_del_init(&hwreq->queue);
920 if (hwreq->req.complete != NULL) {
921 spin_unlock(hwep->lock);
922 if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
924 hweptemp = hwep->ci->ep0in;
925 usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
926 spin_lock(hwep->lock);
930 if (retval == -EBUSY)
937 * isr_setup_packet_handler: setup packet handler
938 * @ci: UDC descriptor
940 * This function handles setup packet
942 static void isr_setup_packet_handler(struct ci_hdrc *ci)
946 struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
947 struct usb_ctrlrequest req;
948 int type, num, dir, err = -EINVAL;
952 * Flush data and handshake transactions of previous
955 _ep_nuke(ci->ep0out);
958 /* read_setup_packet */
960 hw_test_and_set_setup_guard(ci);
961 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
962 } while (!hw_test_and_clear_setup_guard(ci));
964 type = req.bRequestType;
966 ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
968 switch (req.bRequest) {
969 case USB_REQ_CLEAR_FEATURE:
970 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
971 le16_to_cpu(req.wValue) ==
973 if (req.wLength != 0)
975 num = le16_to_cpu(req.wIndex);
976 dir = num & USB_ENDPOINT_DIR_MASK;
977 num &= USB_ENDPOINT_NUMBER_MASK;
979 num += ci->hw_ep_max / 2;
980 if (!ci->ci_hw_ep[num].wedge) {
981 spin_unlock(&ci->lock);
982 err = usb_ep_clear_halt(
983 &ci->ci_hw_ep[num].ep);
984 spin_lock(&ci->lock);
988 err = isr_setup_status_phase(ci);
989 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
990 le16_to_cpu(req.wValue) ==
991 USB_DEVICE_REMOTE_WAKEUP) {
992 if (req.wLength != 0)
994 ci->remote_wakeup = 0;
995 err = isr_setup_status_phase(ci);
1000 case USB_REQ_GET_STATUS:
1001 if (type != (USB_DIR_IN|USB_RECIP_DEVICE) &&
1002 type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1003 type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1005 if (le16_to_cpu(req.wLength) != 2 ||
1006 le16_to_cpu(req.wValue) != 0)
1008 err = isr_get_status_response(ci, &req);
1010 case USB_REQ_SET_ADDRESS:
1011 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1013 if (le16_to_cpu(req.wLength) != 0 ||
1014 le16_to_cpu(req.wIndex) != 0)
1016 ci->address = (u8)le16_to_cpu(req.wValue);
1018 err = isr_setup_status_phase(ci);
1020 case USB_REQ_SET_FEATURE:
1021 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1022 le16_to_cpu(req.wValue) ==
1023 USB_ENDPOINT_HALT) {
1024 if (req.wLength != 0)
1026 num = le16_to_cpu(req.wIndex);
1027 dir = num & USB_ENDPOINT_DIR_MASK;
1028 num &= USB_ENDPOINT_NUMBER_MASK;
1030 num += ci->hw_ep_max / 2;
1032 spin_unlock(&ci->lock);
1033 err = usb_ep_set_halt(&ci->ci_hw_ep[num].ep);
1034 spin_lock(&ci->lock);
1036 isr_setup_status_phase(ci);
1037 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1038 if (req.wLength != 0)
1040 switch (le16_to_cpu(req.wValue)) {
1041 case USB_DEVICE_REMOTE_WAKEUP:
1042 ci->remote_wakeup = 1;
1043 err = isr_setup_status_phase(ci);
1045 case USB_DEVICE_TEST_MODE:
1046 tmode = le16_to_cpu(req.wIndex) >> 8;
1053 ci->test_mode = tmode;
1054 err = isr_setup_status_phase(
1061 case USB_DEVICE_B_HNP_ENABLE:
1062 if (ci_otg_is_fsm_mode(ci)) {
1063 ci->gadget.b_hnp_enable = 1;
1064 err = isr_setup_status_phase(
1077 if (req.wLength == 0) /* no data phase */
1080 spin_unlock(&ci->lock);
1081 err = ci->driver->setup(&ci->gadget, &req);
1082 spin_lock(&ci->lock);
1087 spin_unlock(&ci->lock);
1088 if (usb_ep_set_halt(&hwep->ep))
1089 dev_err(ci->dev, "error: ep_set_halt\n");
1090 spin_lock(&ci->lock);
1095 * isr_tr_complete_handler: transaction complete interrupt handler
1096 * @ci: UDC descriptor
1098 * This function handles traffic events
1100 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1101 __releases(ci->lock)
1102 __acquires(ci->lock)
1107 for (i = 0; i < ci->hw_ep_max; i++) {
1108 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1110 if (hwep->ep.desc == NULL)
1111 continue; /* not configured */
1113 if (hw_test_and_clear_complete(ci, i)) {
1114 err = isr_tr_complete_low(hwep);
1115 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1116 if (err > 0) /* needs status phase */
1117 err = isr_setup_status_phase(ci);
1119 spin_unlock(&ci->lock);
1120 if (usb_ep_set_halt(&hwep->ep))
1122 "error: ep_set_halt\n");
1123 spin_lock(&ci->lock);
1128 /* Only handle setup packet below */
1130 hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1131 isr_setup_packet_handler(ci);
1135 /******************************************************************************
1137 *****************************************************************************/
1139 * ep_enable: configure endpoint, making it usable
1141 * Check usb_ep_enable() at "usb_gadget.h" for details
1143 static int ep_enable(struct usb_ep *ep,
1144 const struct usb_endpoint_descriptor *desc)
1146 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1148 unsigned long flags;
1151 if (ep == NULL || desc == NULL)
1154 spin_lock_irqsave(hwep->lock, flags);
1156 /* only internal SW should enable ctrl endpts */
1158 hwep->ep.desc = desc;
1160 if (!list_empty(&hwep->qh.queue))
1161 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1163 hwep->dir = usb_endpoint_dir_in(desc) ? TX : RX;
1164 hwep->num = usb_endpoint_num(desc);
1165 hwep->type = usb_endpoint_type(desc);
1167 hwep->ep.maxpacket = usb_endpoint_maxp(desc) & 0x07ff;
1168 hwep->ep.mult = QH_ISO_MULT(usb_endpoint_maxp(desc));
1170 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1174 cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1176 * For ISO-TX, we set mult at QH as the largest value, and use
1177 * MultO at TD as real mult value.
1179 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1180 cap |= 3 << __ffs(QH_MULT);
1182 hwep->qh.ptr->cap = cpu_to_le32(cap);
1184 hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE); /* needed? */
1186 if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1187 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1192 * Enable endpoints in the HW other than ep0 as ep0
1196 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1199 spin_unlock_irqrestore(hwep->lock, flags);
1204 * ep_disable: endpoint is no longer usable
1206 * Check usb_ep_disable() at "usb_gadget.h" for details
1208 static int ep_disable(struct usb_ep *ep)
1210 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1211 int direction, retval = 0;
1212 unsigned long flags;
1216 else if (hwep->ep.desc == NULL)
1219 spin_lock_irqsave(hwep->lock, flags);
1221 /* only internal SW should disable ctrl endpts */
1223 direction = hwep->dir;
1225 retval |= _ep_nuke(hwep);
1226 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1228 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1229 hwep->dir = (hwep->dir == TX) ? RX : TX;
1231 } while (hwep->dir != direction);
1233 hwep->ep.desc = NULL;
1235 spin_unlock_irqrestore(hwep->lock, flags);
1240 * ep_alloc_request: allocate a request object to use with this endpoint
1242 * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1244 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1246 struct ci_hw_req *hwreq = NULL;
1251 hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1252 if (hwreq != NULL) {
1253 INIT_LIST_HEAD(&hwreq->queue);
1254 INIT_LIST_HEAD(&hwreq->tds);
1257 return (hwreq == NULL) ? NULL : &hwreq->req;
1261 * ep_free_request: frees a request object
1263 * Check usb_ep_free_request() at "usb_gadget.h" for details
1265 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1267 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1268 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1269 struct td_node *node, *tmpnode;
1270 unsigned long flags;
1272 if (ep == NULL || req == NULL) {
1274 } else if (!list_empty(&hwreq->queue)) {
1275 dev_err(hwep->ci->dev, "freeing queued request\n");
1279 spin_lock_irqsave(hwep->lock, flags);
1281 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1282 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1283 list_del_init(&node->td);
1290 spin_unlock_irqrestore(hwep->lock, flags);
1294 * ep_queue: queues (submits) an I/O request to an endpoint
1296 * Check usb_ep_queue()* at usb_gadget.h" for details
1298 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1299 gfp_t __maybe_unused gfp_flags)
1301 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1303 unsigned long flags;
1305 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1308 spin_lock_irqsave(hwep->lock, flags);
1309 retval = _ep_queue(ep, req, gfp_flags);
1310 spin_unlock_irqrestore(hwep->lock, flags);
1315 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1317 * Check usb_ep_dequeue() at "usb_gadget.h" for details
1319 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1321 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1322 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1323 unsigned long flags;
1324 struct td_node *node, *tmpnode;
1326 if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1327 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1328 list_empty(&hwep->qh.queue))
1331 spin_lock_irqsave(hwep->lock, flags);
1333 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1335 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1336 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1337 list_del(&node->td);
1342 list_del_init(&hwreq->queue);
1344 usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1346 req->status = -ECONNRESET;
1348 if (hwreq->req.complete != NULL) {
1349 spin_unlock(hwep->lock);
1350 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1351 spin_lock(hwep->lock);
1354 spin_unlock_irqrestore(hwep->lock, flags);
1359 * ep_set_halt: sets the endpoint halt feature
1361 * Check usb_ep_set_halt() at "usb_gadget.h" for details
1363 static int ep_set_halt(struct usb_ep *ep, int value)
1365 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1366 int direction, retval = 0;
1367 unsigned long flags;
1369 if (ep == NULL || hwep->ep.desc == NULL)
1372 if (usb_endpoint_xfer_isoc(hwep->ep.desc))
1375 spin_lock_irqsave(hwep->lock, flags);
1378 /* g_file_storage MS compliant but g_zero fails chapter 9 compliance */
1379 if (value && hwep->type == USB_ENDPOINT_XFER_BULK && hwep->dir == TX &&
1380 !list_empty(&hwep->qh.queue)) {
1381 spin_unlock_irqrestore(hwep->lock, flags);
1386 direction = hwep->dir;
1388 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
1393 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1394 hwep->dir = (hwep->dir == TX) ? RX : TX;
1396 } while (hwep->dir != direction);
1398 spin_unlock_irqrestore(hwep->lock, flags);
1403 * ep_set_wedge: sets the halt feature and ignores clear requests
1405 * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1407 static int ep_set_wedge(struct usb_ep *ep)
1409 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1410 unsigned long flags;
1412 if (ep == NULL || hwep->ep.desc == NULL)
1415 spin_lock_irqsave(hwep->lock, flags);
1417 spin_unlock_irqrestore(hwep->lock, flags);
1419 return usb_ep_set_halt(ep);
1423 * ep_fifo_flush: flushes contents of a fifo
1425 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1427 static void ep_fifo_flush(struct usb_ep *ep)
1429 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1430 unsigned long flags;
1433 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1437 spin_lock_irqsave(hwep->lock, flags);
1439 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1441 spin_unlock_irqrestore(hwep->lock, flags);
1445 * Endpoint-specific part of the API to the USB controller hardware
1446 * Check "usb_gadget.h" for details
1448 static const struct usb_ep_ops usb_ep_ops = {
1449 .enable = ep_enable,
1450 .disable = ep_disable,
1451 .alloc_request = ep_alloc_request,
1452 .free_request = ep_free_request,
1454 .dequeue = ep_dequeue,
1455 .set_halt = ep_set_halt,
1456 .set_wedge = ep_set_wedge,
1457 .fifo_flush = ep_fifo_flush,
1460 /******************************************************************************
1462 *****************************************************************************/
1463 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1465 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1466 unsigned long flags;
1467 int gadget_ready = 0;
1469 spin_lock_irqsave(&ci->lock, flags);
1470 ci->vbus_active = is_active;
1473 spin_unlock_irqrestore(&ci->lock, flags);
1477 pm_runtime_get_sync(&_gadget->dev);
1478 hw_device_reset(ci, USBMODE_CM_DC);
1479 hw_device_state(ci, ci->ep0out->qh.dma);
1480 usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1483 ci->driver->disconnect(&ci->gadget);
1484 hw_device_state(ci, 0);
1485 if (ci->platdata->notify_event)
1486 ci->platdata->notify_event(ci,
1487 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1488 _gadget_stop_activity(&ci->gadget);
1489 pm_runtime_put_sync(&_gadget->dev);
1490 usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1497 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1499 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1500 unsigned long flags;
1503 spin_lock_irqsave(&ci->lock, flags);
1504 if (!ci->remote_wakeup) {
1508 if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1512 hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1514 spin_unlock_irqrestore(&ci->lock, flags);
1518 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1520 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1522 if (ci->transceiver)
1523 return usb_phy_set_power(ci->transceiver, ma);
1527 /* Change Data+ pullup status
1528 * this func is used by usb_gadget_connect/disconnet
1530 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1532 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1534 if (!ci->vbus_active)
1538 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1540 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1545 static int ci_udc_start(struct usb_gadget *gadget,
1546 struct usb_gadget_driver *driver);
1547 static int ci_udc_stop(struct usb_gadget *gadget,
1548 struct usb_gadget_driver *driver);
1550 * Device operations part of the API to the USB controller hardware,
1551 * which don't involve endpoints (or i/o)
1552 * Check "usb_gadget.h" for details
1554 static const struct usb_gadget_ops usb_gadget_ops = {
1555 .vbus_session = ci_udc_vbus_session,
1556 .wakeup = ci_udc_wakeup,
1557 .pullup = ci_udc_pullup,
1558 .vbus_draw = ci_udc_vbus_draw,
1559 .udc_start = ci_udc_start,
1560 .udc_stop = ci_udc_stop,
1563 static int init_eps(struct ci_hdrc *ci)
1565 int retval = 0, i, j;
1567 for (i = 0; i < ci->hw_ep_max/2; i++)
1568 for (j = RX; j <= TX; j++) {
1569 int k = i + j * ci->hw_ep_max/2;
1570 struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1572 scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1573 (j == TX) ? "in" : "out");
1576 hwep->lock = &ci->lock;
1577 hwep->td_pool = ci->td_pool;
1579 hwep->ep.name = hwep->name;
1580 hwep->ep.ops = &usb_ep_ops;
1582 * for ep0: maxP defined in desc, for other
1583 * eps, maxP is set by epautoconfig() called
1586 usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1588 INIT_LIST_HEAD(&hwep->qh.queue);
1589 hwep->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
1591 if (hwep->qh.ptr == NULL)
1594 memset(hwep->qh.ptr, 0, sizeof(*hwep->qh.ptr));
1597 * set up shorthands for ep0 out and in endpoints,
1598 * don't add to gadget's ep_list
1606 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1610 list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1616 static void destroy_eps(struct ci_hdrc *ci)
1620 for (i = 0; i < ci->hw_ep_max; i++) {
1621 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1623 if (hwep->pending_td)
1624 free_pending_td(hwep);
1625 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1630 * ci_udc_start: register a gadget driver
1631 * @gadget: our gadget
1632 * @driver: the driver being registered
1634 * Interrupts are enabled here.
1636 static int ci_udc_start(struct usb_gadget *gadget,
1637 struct usb_gadget_driver *driver)
1639 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1640 unsigned long flags;
1641 int retval = -ENOMEM;
1643 if (driver->disconnect == NULL)
1647 ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1648 retval = usb_ep_enable(&ci->ep0out->ep);
1652 ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1653 retval = usb_ep_enable(&ci->ep0in->ep);
1657 ci->driver = driver;
1659 /* Start otg fsm for B-device */
1660 if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1661 ci_hdrc_otg_fsm_start(ci);
1665 pm_runtime_get_sync(&ci->gadget.dev);
1666 if (ci->vbus_active) {
1667 spin_lock_irqsave(&ci->lock, flags);
1668 hw_device_reset(ci, USBMODE_CM_DC);
1670 pm_runtime_put_sync(&ci->gadget.dev);
1674 retval = hw_device_state(ci, ci->ep0out->qh.dma);
1675 spin_unlock_irqrestore(&ci->lock, flags);
1677 pm_runtime_put_sync(&ci->gadget.dev);
1683 * ci_udc_stop: unregister a gadget driver
1685 static int ci_udc_stop(struct usb_gadget *gadget,
1686 struct usb_gadget_driver *driver)
1688 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1689 unsigned long flags;
1691 spin_lock_irqsave(&ci->lock, flags);
1693 if (ci->vbus_active) {
1694 hw_device_state(ci, 0);
1695 if (ci->platdata->notify_event)
1696 ci->platdata->notify_event(ci,
1697 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1698 spin_unlock_irqrestore(&ci->lock, flags);
1699 _gadget_stop_activity(&ci->gadget);
1700 spin_lock_irqsave(&ci->lock, flags);
1701 pm_runtime_put(&ci->gadget.dev);
1705 spin_unlock_irqrestore(&ci->lock, flags);
1710 /******************************************************************************
1712 *****************************************************************************/
1714 * udc_irq: ci interrupt handler
1716 * This function returns IRQ_HANDLED if the IRQ has been handled
1717 * It locks access to registers
1719 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1727 spin_lock(&ci->lock);
1729 if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1730 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1732 spin_unlock(&ci->lock);
1736 intr = hw_test_and_clear_intr_active(ci);
1739 /* order defines priority - do NOT change it */
1740 if (USBi_URI & intr)
1741 isr_reset_handler(ci);
1743 if (USBi_PCI & intr) {
1744 ci->gadget.speed = hw_port_is_high_speed(ci) ?
1745 USB_SPEED_HIGH : USB_SPEED_FULL;
1746 if (ci->suspended && ci->driver->resume) {
1747 spin_unlock(&ci->lock);
1748 ci->driver->resume(&ci->gadget);
1749 spin_lock(&ci->lock);
1755 isr_tr_complete_handler(ci);
1757 if (USBi_SLI & intr) {
1758 if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1759 ci->driver->suspend) {
1761 spin_unlock(&ci->lock);
1762 ci->driver->suspend(&ci->gadget);
1763 usb_gadget_set_state(&ci->gadget,
1764 USB_STATE_SUSPENDED);
1765 spin_lock(&ci->lock);
1768 retval = IRQ_HANDLED;
1772 spin_unlock(&ci->lock);
1778 * udc_start: initialize gadget role
1779 * @ci: chipidea controller
1781 static int udc_start(struct ci_hdrc *ci)
1783 struct device *dev = ci->dev;
1786 spin_lock_init(&ci->lock);
1788 ci->gadget.ops = &usb_gadget_ops;
1789 ci->gadget.speed = USB_SPEED_UNKNOWN;
1790 ci->gadget.max_speed = USB_SPEED_HIGH;
1791 ci->gadget.is_otg = ci->is_otg ? 1 : 0;
1792 ci->gadget.name = ci->platdata->name;
1794 INIT_LIST_HEAD(&ci->gadget.ep_list);
1796 /* alloc resources */
1797 ci->qh_pool = dma_pool_create("ci_hw_qh", dev,
1798 sizeof(struct ci_hw_qh),
1799 64, CI_HDRC_PAGE_SIZE);
1800 if (ci->qh_pool == NULL)
1803 ci->td_pool = dma_pool_create("ci_hw_td", dev,
1804 sizeof(struct ci_hw_td),
1805 64, CI_HDRC_PAGE_SIZE);
1806 if (ci->td_pool == NULL) {
1811 retval = init_eps(ci);
1815 ci->gadget.ep0 = &ci->ep0in->ep;
1817 retval = usb_add_gadget_udc(dev, &ci->gadget);
1821 pm_runtime_no_callbacks(&ci->gadget.dev);
1822 pm_runtime_enable(&ci->gadget.dev);
1829 dma_pool_destroy(ci->td_pool);
1831 dma_pool_destroy(ci->qh_pool);
1836 * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1838 * No interrupts active, the IRQ has been released
1840 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1842 if (!ci->roles[CI_ROLE_GADGET])
1845 usb_del_gadget_udc(&ci->gadget);
1849 dma_pool_destroy(ci->td_pool);
1850 dma_pool_destroy(ci->qh_pool);
1853 static int udc_id_switch_for_device(struct ci_hdrc *ci)
1856 /* Clear and enable BSV irq */
1857 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
1858 OTGSC_BSVIS | OTGSC_BSVIE);
1863 static void udc_id_switch_for_host(struct ci_hdrc *ci)
1866 * host doesn't care B_SESSION_VALID event
1867 * so clear and disbale BSV irq
1870 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
1874 * ci_hdrc_gadget_init - initialize device related bits
1875 * ci: the controller
1877 * This function initializes the gadget, if the device is "device capable".
1879 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
1881 struct ci_role_driver *rdrv;
1883 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1886 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
1890 rdrv->start = udc_id_switch_for_device;
1891 rdrv->stop = udc_id_switch_for_host;
1892 rdrv->irq = udc_irq;
1893 rdrv->name = "gadget";
1894 ci->roles[CI_ROLE_GADGET] = rdrv;
1896 return udc_start(ci);