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 |= cpu_to_le32(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_by_dev(ci->dev->parent,
427 &hwreq->req, hwep->dir);
432 * The first buffer could be not page aligned.
433 * In that case we have to span into one extra td.
435 if (hwreq->req.dma % PAGE_SIZE)
439 ret = add_td_to_list(hwep, hwreq, 0);
445 unsigned count = min(hwreq->req.length - hwreq->req.actual,
446 (unsigned)(pages * CI_HDRC_PAGE_SIZE));
447 ret = add_td_to_list(hwep, hwreq, count);
454 if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
455 && (hwreq->req.length % hwep->ep.maxpacket == 0)) {
456 ret = add_td_to_list(hwep, hwreq, 0);
461 firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
463 lastnode = list_entry(hwreq->tds.prev,
466 lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
467 if (!hwreq->req.no_interrupt)
468 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
471 hwreq->req.actual = 0;
472 if (!list_empty(&hwep->qh.queue)) {
473 struct ci_hw_req *hwreqprev;
474 int n = hw_ep_bit(hwep->num, hwep->dir);
476 struct td_node *prevlastnode;
477 u32 next = firstnode->dma & TD_ADDR_MASK;
479 hwreqprev = list_entry(hwep->qh.queue.prev,
480 struct ci_hw_req, queue);
481 prevlastnode = list_entry(hwreqprev->tds.prev,
484 prevlastnode->ptr->next = cpu_to_le32(next);
486 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
489 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
490 tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
491 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
492 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
497 /* QH configuration */
498 hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
499 hwep->qh.ptr->td.token &=
500 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
502 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
503 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
505 if (hwreq->req.length == 0
506 || hwreq->req.length % hwep->ep.maxpacket)
508 hwep->qh.ptr->cap |= cpu_to_le32(mul << __ffs(QH_MULT));
511 ret = hw_ep_prime(ci, hwep->num, hwep->dir,
512 hwep->type == USB_ENDPOINT_XFER_CONTROL);
518 * free_pending_td: remove a pending request for the endpoint
521 static void free_pending_td(struct ci_hw_ep *hwep)
523 struct td_node *pending = hwep->pending_td;
525 dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
526 hwep->pending_td = NULL;
530 static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
531 struct td_node *node)
533 hwep->qh.ptr->td.next = cpu_to_le32(node->dma);
534 hwep->qh.ptr->td.token &=
535 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
537 return hw_ep_prime(ci, hwep->num, hwep->dir,
538 hwep->type == USB_ENDPOINT_XFER_CONTROL);
542 * _hardware_dequeue: handles a request at hardware level
546 * This function returns an error code
548 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
551 struct td_node *node, *tmpnode;
552 unsigned remaining_length;
553 unsigned actual = hwreq->req.length;
554 struct ci_hdrc *ci = hwep->ci;
556 if (hwreq->req.status != -EALREADY)
559 hwreq->req.status = 0;
561 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
562 tmptoken = le32_to_cpu(node->ptr->token);
563 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
564 int n = hw_ep_bit(hwep->num, hwep->dir);
566 if (ci->rev == CI_REVISION_24)
567 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
568 reprime_dtd(ci, hwep, node);
569 hwreq->req.status = -EALREADY;
573 remaining_length = (tmptoken & TD_TOTAL_BYTES);
574 remaining_length >>= __ffs(TD_TOTAL_BYTES);
575 actual -= remaining_length;
577 hwreq->req.status = tmptoken & TD_STATUS;
578 if ((TD_STATUS_HALTED & hwreq->req.status)) {
579 hwreq->req.status = -EPIPE;
581 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
582 hwreq->req.status = -EPROTO;
584 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
585 hwreq->req.status = -EILSEQ;
589 if (remaining_length) {
590 if (hwep->dir == TX) {
591 hwreq->req.status = -EPROTO;
596 * As the hardware could still address the freed td
597 * which will run the udc unusable, the cleanup of the
598 * td has to be delayed by one.
600 if (hwep->pending_td)
601 free_pending_td(hwep);
603 hwep->pending_td = node;
604 list_del_init(&node->td);
607 usb_gadget_unmap_request_by_dev(hwep->ci->dev->parent,
608 &hwreq->req, hwep->dir);
610 hwreq->req.actual += actual;
612 if (hwreq->req.status)
613 return hwreq->req.status;
615 return hwreq->req.actual;
619 * _ep_nuke: dequeues all endpoint requests
622 * This function returns an error code
623 * Caller must hold lock
625 static int _ep_nuke(struct ci_hw_ep *hwep)
626 __releases(hwep->lock)
627 __acquires(hwep->lock)
629 struct td_node *node, *tmpnode;
633 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
635 while (!list_empty(&hwep->qh.queue)) {
637 /* pop oldest request */
638 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
639 struct ci_hw_req, queue);
641 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
642 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
643 list_del_init(&node->td);
648 list_del_init(&hwreq->queue);
649 hwreq->req.status = -ESHUTDOWN;
651 if (hwreq->req.complete != NULL) {
652 spin_unlock(hwep->lock);
653 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
654 spin_lock(hwep->lock);
658 if (hwep->pending_td)
659 free_pending_td(hwep);
664 static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
666 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
667 int direction, retval = 0;
670 if (ep == NULL || hwep->ep.desc == NULL)
673 if (usb_endpoint_xfer_isoc(hwep->ep.desc))
676 spin_lock_irqsave(hwep->lock, flags);
678 if (value && hwep->dir == TX && check_transfer &&
679 !list_empty(&hwep->qh.queue) &&
680 !usb_endpoint_xfer_control(hwep->ep.desc)) {
681 spin_unlock_irqrestore(hwep->lock, flags);
685 direction = hwep->dir;
687 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
692 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
693 hwep->dir = (hwep->dir == TX) ? RX : TX;
695 } while (hwep->dir != direction);
697 spin_unlock_irqrestore(hwep->lock, flags);
703 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
706 * This function returns an error code
708 static int _gadget_stop_activity(struct usb_gadget *gadget)
711 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
714 /* flush all endpoints */
715 gadget_for_each_ep(ep, gadget) {
716 usb_ep_fifo_flush(ep);
718 usb_ep_fifo_flush(&ci->ep0out->ep);
719 usb_ep_fifo_flush(&ci->ep0in->ep);
721 /* make sure to disable all endpoints */
722 gadget_for_each_ep(ep, gadget) {
726 if (ci->status != NULL) {
727 usb_ep_free_request(&ci->ep0in->ep, ci->status);
731 spin_lock_irqsave(&ci->lock, flags);
732 ci->gadget.speed = USB_SPEED_UNKNOWN;
733 ci->remote_wakeup = 0;
735 spin_unlock_irqrestore(&ci->lock, flags);
740 /******************************************************************************
742 *****************************************************************************/
744 * isr_reset_handler: USB reset interrupt handler
747 * This function resets USB engine after a bus reset occurred
749 static void isr_reset_handler(struct ci_hdrc *ci)
755 spin_unlock(&ci->lock);
756 if (ci->gadget.speed != USB_SPEED_UNKNOWN)
757 usb_gadget_udc_reset(&ci->gadget, ci->driver);
759 retval = _gadget_stop_activity(&ci->gadget);
763 retval = hw_usb_reset(ci);
767 ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
768 if (ci->status == NULL)
772 spin_lock(&ci->lock);
775 dev_err(ci->dev, "error: %i\n", retval);
779 * isr_get_status_complete: get_status request complete function
781 * @req: request handled
783 * Caller must release lock
785 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
787 if (ep == NULL || req == NULL)
791 usb_ep_free_request(ep, req);
795 * _ep_queue: queues (submits) an I/O request to an endpoint
798 * @gfp_flags: GFP flags (not used)
800 * Caller must hold lock
801 * This function returns an error code
803 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
804 gfp_t __maybe_unused gfp_flags)
806 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
807 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
808 struct ci_hdrc *ci = hwep->ci;
811 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
814 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
816 hwep = (ci->ep0_dir == RX) ?
817 ci->ep0out : ci->ep0in;
818 if (!list_empty(&hwep->qh.queue)) {
820 dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
825 if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
826 hwreq->req.length > hwep->ep.mult * hwep->ep.maxpacket) {
827 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
831 /* first nuke then test link, e.g. previous status has not sent */
832 if (!list_empty(&hwreq->queue)) {
833 dev_err(hwep->ci->dev, "request already in queue\n");
838 hwreq->req.status = -EINPROGRESS;
839 hwreq->req.actual = 0;
841 retval = _hardware_enqueue(hwep, hwreq);
843 if (retval == -EALREADY)
846 list_add_tail(&hwreq->queue, &hwep->qh.queue);
852 * isr_get_status_response: get_status request response
854 * @setup: setup request packet
856 * This function returns an error code
858 static int isr_get_status_response(struct ci_hdrc *ci,
859 struct usb_ctrlrequest *setup)
860 __releases(hwep->lock)
861 __acquires(hwep->lock)
863 struct ci_hw_ep *hwep = ci->ep0in;
864 struct usb_request *req = NULL;
865 gfp_t gfp_flags = GFP_ATOMIC;
866 int dir, num, retval;
868 if (hwep == NULL || setup == NULL)
871 spin_unlock(hwep->lock);
872 req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
873 spin_lock(hwep->lock);
877 req->complete = isr_get_status_complete;
879 req->buf = kzalloc(req->length, gfp_flags);
880 if (req->buf == NULL) {
885 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
886 *(u16 *)req->buf = (ci->remote_wakeup << 1) |
887 ci->gadget.is_selfpowered;
888 } else if ((setup->bRequestType & USB_RECIP_MASK) \
889 == USB_RECIP_ENDPOINT) {
890 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
892 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
893 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
895 /* else do nothing; reserved for future use */
897 retval = _ep_queue(&hwep->ep, req, gfp_flags);
906 spin_unlock(hwep->lock);
907 usb_ep_free_request(&hwep->ep, req);
908 spin_lock(hwep->lock);
913 * isr_setup_status_complete: setup_status request complete function
915 * @req: request handled
917 * Caller must release lock. Put the port in test mode if test mode
918 * feature is selected.
921 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
923 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);
1543 pm_runtime_get_sync(&_gadget->dev);
1544 hw_device_reset(ci);
1545 hw_device_state(ci, ci->ep0out->qh.dma);
1546 usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1547 usb_udc_vbus_handler(_gadget, true);
1549 usb_udc_vbus_handler(_gadget, false);
1551 ci->driver->disconnect(&ci->gadget);
1552 hw_device_state(ci, 0);
1553 if (ci->platdata->notify_event)
1554 ci->platdata->notify_event(ci,
1555 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1556 _gadget_stop_activity(&ci->gadget);
1557 pm_runtime_put_sync(&_gadget->dev);
1558 usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1565 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1567 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1568 unsigned long flags;
1571 spin_lock_irqsave(&ci->lock, flags);
1572 if (ci->gadget.speed == USB_SPEED_UNKNOWN) {
1573 spin_unlock_irqrestore(&ci->lock, flags);
1576 if (!ci->remote_wakeup) {
1580 if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1584 hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1586 spin_unlock_irqrestore(&ci->lock, flags);
1590 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1592 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1595 return usb_phy_set_power(ci->usb_phy, ma);
1599 static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1601 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1602 struct ci_hw_ep *hwep = ci->ep0in;
1603 unsigned long flags;
1605 spin_lock_irqsave(hwep->lock, flags);
1606 _gadget->is_selfpowered = (is_on != 0);
1607 spin_unlock_irqrestore(hwep->lock, flags);
1612 /* Change Data+ pullup status
1613 * this func is used by usb_gadget_connect/disconnet
1615 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1617 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1620 * Data+ pullup controlled by OTG state machine in OTG fsm mode;
1621 * and don't touch Data+ in host mode for dual role config.
1623 if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST)
1626 pm_runtime_get_sync(&ci->gadget.dev);
1628 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1630 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1631 pm_runtime_put_sync(&ci->gadget.dev);
1636 static int ci_udc_start(struct usb_gadget *gadget,
1637 struct usb_gadget_driver *driver);
1638 static int ci_udc_stop(struct usb_gadget *gadget);
1640 /* Match ISOC IN from the highest endpoint */
1641 static struct usb_ep *ci_udc_match_ep(struct usb_gadget *gadget,
1642 struct usb_endpoint_descriptor *desc,
1643 struct usb_ss_ep_comp_descriptor *comp_desc)
1645 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1648 if (usb_endpoint_xfer_isoc(desc) && usb_endpoint_dir_in(desc)) {
1649 list_for_each_entry_reverse(ep, &ci->gadget.ep_list, ep_list) {
1650 if (ep->caps.dir_in && !ep->claimed)
1659 * Device operations part of the API to the USB controller hardware,
1660 * which don't involve endpoints (or i/o)
1661 * Check "usb_gadget.h" for details
1663 static const struct usb_gadget_ops usb_gadget_ops = {
1664 .vbus_session = ci_udc_vbus_session,
1665 .wakeup = ci_udc_wakeup,
1666 .set_selfpowered = ci_udc_selfpowered,
1667 .pullup = ci_udc_pullup,
1668 .vbus_draw = ci_udc_vbus_draw,
1669 .udc_start = ci_udc_start,
1670 .udc_stop = ci_udc_stop,
1671 .match_ep = ci_udc_match_ep,
1674 static int init_eps(struct ci_hdrc *ci)
1676 int retval = 0, i, j;
1678 for (i = 0; i < ci->hw_ep_max/2; i++)
1679 for (j = RX; j <= TX; j++) {
1680 int k = i + j * ci->hw_ep_max/2;
1681 struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1683 scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1684 (j == TX) ? "in" : "out");
1687 hwep->lock = &ci->lock;
1688 hwep->td_pool = ci->td_pool;
1690 hwep->ep.name = hwep->name;
1691 hwep->ep.ops = &usb_ep_ops;
1694 hwep->ep.caps.type_control = true;
1696 hwep->ep.caps.type_iso = true;
1697 hwep->ep.caps.type_bulk = true;
1698 hwep->ep.caps.type_int = true;
1702 hwep->ep.caps.dir_in = true;
1704 hwep->ep.caps.dir_out = true;
1707 * for ep0: maxP defined in desc, for other
1708 * eps, maxP is set by epautoconfig() called
1711 usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1713 INIT_LIST_HEAD(&hwep->qh.queue);
1714 hwep->qh.ptr = dma_pool_zalloc(ci->qh_pool, GFP_KERNEL,
1716 if (hwep->qh.ptr == NULL)
1720 * set up shorthands for ep0 out and in endpoints,
1721 * don't add to gadget's ep_list
1729 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1733 list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1739 static void destroy_eps(struct ci_hdrc *ci)
1743 for (i = 0; i < ci->hw_ep_max; i++) {
1744 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1746 if (hwep->pending_td)
1747 free_pending_td(hwep);
1748 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1753 * ci_udc_start: register a gadget driver
1754 * @gadget: our gadget
1755 * @driver: the driver being registered
1757 * Interrupts are enabled here.
1759 static int ci_udc_start(struct usb_gadget *gadget,
1760 struct usb_gadget_driver *driver)
1762 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1763 int retval = -ENOMEM;
1765 if (driver->disconnect == NULL)
1769 ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1770 retval = usb_ep_enable(&ci->ep0out->ep);
1774 ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1775 retval = usb_ep_enable(&ci->ep0in->ep);
1779 ci->driver = driver;
1781 /* Start otg fsm for B-device */
1782 if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1783 ci_hdrc_otg_fsm_start(ci);
1787 pm_runtime_get_sync(&ci->gadget.dev);
1788 if (ci->vbus_active) {
1789 hw_device_reset(ci);
1791 usb_udc_vbus_handler(&ci->gadget, false);
1792 pm_runtime_put_sync(&ci->gadget.dev);
1796 retval = hw_device_state(ci, ci->ep0out->qh.dma);
1798 pm_runtime_put_sync(&ci->gadget.dev);
1803 static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
1805 if (!ci_otg_is_fsm_mode(ci))
1808 mutex_lock(&ci->fsm.lock);
1809 if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
1810 ci->fsm.a_bidl_adis_tmout = 1;
1811 ci_hdrc_otg_fsm_start(ci);
1812 } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
1813 ci->fsm.protocol = PROTO_UNDEF;
1814 ci->fsm.otg->state = OTG_STATE_UNDEFINED;
1816 mutex_unlock(&ci->fsm.lock);
1820 * ci_udc_stop: unregister a gadget driver
1822 static int ci_udc_stop(struct usb_gadget *gadget)
1824 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1825 unsigned long flags;
1827 spin_lock_irqsave(&ci->lock, flags);
1829 if (ci->vbus_active) {
1830 hw_device_state(ci, 0);
1831 spin_unlock_irqrestore(&ci->lock, flags);
1832 if (ci->platdata->notify_event)
1833 ci->platdata->notify_event(ci,
1834 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1835 _gadget_stop_activity(&ci->gadget);
1836 spin_lock_irqsave(&ci->lock, flags);
1837 pm_runtime_put(&ci->gadget.dev);
1841 spin_unlock_irqrestore(&ci->lock, flags);
1843 ci_udc_stop_for_otg_fsm(ci);
1847 /******************************************************************************
1849 *****************************************************************************/
1851 * udc_irq: ci interrupt handler
1853 * This function returns IRQ_HANDLED if the IRQ has been handled
1854 * It locks access to registers
1856 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1864 spin_lock(&ci->lock);
1866 if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1867 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1869 spin_unlock(&ci->lock);
1873 intr = hw_test_and_clear_intr_active(ci);
1876 /* order defines priority - do NOT change it */
1877 if (USBi_URI & intr)
1878 isr_reset_handler(ci);
1880 if (USBi_PCI & intr) {
1881 ci->gadget.speed = hw_port_is_high_speed(ci) ?
1882 USB_SPEED_HIGH : USB_SPEED_FULL;
1883 if (ci->suspended) {
1884 if (ci->driver->resume) {
1885 spin_unlock(&ci->lock);
1886 ci->driver->resume(&ci->gadget);
1887 spin_lock(&ci->lock);
1890 usb_gadget_set_state(&ci->gadget,
1896 isr_tr_complete_handler(ci);
1898 if ((USBi_SLI & intr) && !(ci->suspended)) {
1900 ci->resume_state = ci->gadget.state;
1901 if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1902 ci->driver->suspend) {
1903 spin_unlock(&ci->lock);
1904 ci->driver->suspend(&ci->gadget);
1905 spin_lock(&ci->lock);
1907 usb_gadget_set_state(&ci->gadget,
1908 USB_STATE_SUSPENDED);
1910 retval = IRQ_HANDLED;
1914 spin_unlock(&ci->lock);
1920 * udc_start: initialize gadget role
1921 * @ci: chipidea controller
1923 static int udc_start(struct ci_hdrc *ci)
1925 struct device *dev = ci->dev;
1926 struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
1929 ci->gadget.ops = &usb_gadget_ops;
1930 ci->gadget.speed = USB_SPEED_UNKNOWN;
1931 ci->gadget.max_speed = USB_SPEED_HIGH;
1932 ci->gadget.name = ci->platdata->name;
1933 ci->gadget.otg_caps = otg_caps;
1935 if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA)
1936 ci->gadget.quirk_avoids_skb_reserve = 1;
1938 if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
1939 otg_caps->adp_support))
1940 ci->gadget.is_otg = 1;
1942 INIT_LIST_HEAD(&ci->gadget.ep_list);
1944 /* alloc resources */
1945 ci->qh_pool = dma_pool_create("ci_hw_qh", dev->parent,
1946 sizeof(struct ci_hw_qh),
1947 64, CI_HDRC_PAGE_SIZE);
1948 if (ci->qh_pool == NULL)
1951 ci->td_pool = dma_pool_create("ci_hw_td", dev->parent,
1952 sizeof(struct ci_hw_td),
1953 64, CI_HDRC_PAGE_SIZE);
1954 if (ci->td_pool == NULL) {
1959 retval = init_eps(ci);
1963 ci->gadget.ep0 = &ci->ep0in->ep;
1965 retval = usb_add_gadget_udc(dev, &ci->gadget);
1969 pm_runtime_no_callbacks(&ci->gadget.dev);
1970 pm_runtime_enable(&ci->gadget.dev);
1977 dma_pool_destroy(ci->td_pool);
1979 dma_pool_destroy(ci->qh_pool);
1984 * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1986 * No interrupts active, the IRQ has been released
1988 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1990 if (!ci->roles[CI_ROLE_GADGET])
1993 usb_del_gadget_udc(&ci->gadget);
1997 dma_pool_destroy(ci->td_pool);
1998 dma_pool_destroy(ci->qh_pool);
2001 static int udc_id_switch_for_device(struct ci_hdrc *ci)
2004 /* Clear and enable BSV irq */
2005 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
2006 OTGSC_BSVIS | OTGSC_BSVIE);
2011 static void udc_id_switch_for_host(struct ci_hdrc *ci)
2014 * host doesn't care B_SESSION_VALID event
2015 * so clear and disbale BSV irq
2018 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
2020 ci->vbus_active = 0;
2024 * ci_hdrc_gadget_init - initialize device related bits
2025 * ci: the controller
2027 * This function initializes the gadget, if the device is "device capable".
2029 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
2031 struct ci_role_driver *rdrv;
2034 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
2037 rdrv = devm_kzalloc(ci->dev, sizeof(*rdrv), GFP_KERNEL);
2041 rdrv->start = udc_id_switch_for_device;
2042 rdrv->stop = udc_id_switch_for_host;
2043 rdrv->irq = udc_irq;
2044 rdrv->name = "gadget";
2046 ret = udc_start(ci);
2048 ci->roles[CI_ROLE_GADGET] = rdrv;