2 * Faraday USB 2.0 OTG Controller
4 * (C) Copyright 2010 Faraday Technology
5 * Dante Su <dantesu@faraday-tech.com>
7 * SPDX-License-Identifier: GPL-2.0+
16 #include <asm/errno.h>
17 #include <linux/types.h>
18 #include <linux/usb/ch9.h>
19 #include <linux/usb/gadget.h>
21 #include <usb/fotg210.h>
23 #define CFG_NUM_ENDPOINTS 4
24 #define CFG_EP0_MAX_PACKET_SIZE 64
25 #define CFG_EPX_MAX_PACKET_SIZE 512
27 #define CFG_CMD_TIMEOUT (CONFIG_SYS_HZ >> 2) /* 250 ms */
38 struct list_head queue;
39 struct fotg210_chip *chip;
40 const struct usb_endpoint_descriptor *desc;
43 struct fotg210_request {
44 struct usb_request req;
45 struct list_head queue;
46 struct fotg210_ep *ep;
50 struct usb_gadget gadget;
51 struct usb_gadget_driver *driver;
52 struct fotg210_regs *regs;
56 enum usb_device_state state;
57 struct fotg210_ep ep[1 + CFG_NUM_ENDPOINTS];
60 static struct usb_endpoint_descriptor ep0_desc = {
61 .bLength = sizeof(struct usb_endpoint_descriptor),
62 .bDescriptorType = USB_DT_ENDPOINT,
63 .bEndpointAddress = USB_DIR_IN,
64 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
67 static inline int fifo_to_ep(struct fotg210_chip *chip, int id, int in)
69 return (id < 0) ? 0 : ((id & 0x03) + 1);
72 static inline int ep_to_fifo(struct fotg210_chip *chip, int id)
74 return (id <= 0) ? -1 : ((id - 1) & 0x03);
77 static inline int ep_reset(struct fotg210_chip *chip, uint8_t ep_addr)
79 int ep = ep_addr & USB_ENDPOINT_NUMBER_MASK;
80 struct fotg210_regs *regs = chip->regs;
82 if (ep_addr & USB_DIR_IN) {
84 setbits_le32(®s->iep[ep - 1], IEP_RESET);
86 clrbits_le32(®s->iep[ep - 1], IEP_RESET);
87 /* clear endpoint stall */
88 clrbits_le32(®s->iep[ep - 1], IEP_STALL);
91 setbits_le32(®s->oep[ep - 1], OEP_RESET);
93 clrbits_le32(®s->oep[ep - 1], OEP_RESET);
94 /* clear endpoint stall */
95 clrbits_le32(®s->oep[ep - 1], OEP_STALL);
101 static int fotg210_reset(struct fotg210_chip *chip)
103 struct fotg210_regs *regs = chip->regs;
106 chip->state = USB_STATE_POWERED;
109 writel(DEVCTRL_EN, ®s->dev_ctrl);
111 /* device address reset */
113 writel(0, ®s->dev_addr);
115 /* set idle counter to 7ms */
116 writel(7, ®s->idle);
118 /* disable all interrupts */
119 writel(IMR_MASK, ®s->imr);
120 writel(GIMR_MASK, ®s->gimr);
121 writel(GIMR0_MASK, ®s->gimr0);
122 writel(GIMR1_MASK, ®s->gimr1);
123 writel(GIMR2_MASK, ®s->gimr2);
125 /* clear interrupts */
126 writel(ISR_MASK, ®s->isr);
127 writel(0, ®s->gisr);
128 writel(0, ®s->gisr0);
129 writel(0, ®s->gisr1);
130 writel(0, ®s->gisr2);
133 setbits_le32(®s->dev_ctrl, DEVCTRL_RESET);
135 if (readl(®s->dev_ctrl) & DEVCTRL_RESET) {
136 printf("fotg210: chip reset failed\n");
141 setbits_le32(®s->cxfifo, CXFIFO_CXFIFOCLR);
143 if (readl(®s->cxfifo) & CXFIFO_CXFIFOCLR) {
144 printf("fotg210: ep0 fifo reset failed\n");
148 /* create static ep-fifo map (EP1 <-> FIFO0, EP2 <-> FIFO1 ...) */
149 writel(EPMAP14_DEFAULT, ®s->epmap14);
150 writel(EPMAP58_DEFAULT, ®s->epmap58);
151 writel(FIFOMAP_DEFAULT, ®s->fifomap);
152 writel(0, ®s->fifocfg);
153 for (i = 0; i < 8; ++i) {
154 writel(CFG_EPX_MAX_PACKET_SIZE, ®s->iep[i]);
155 writel(CFG_EPX_MAX_PACKET_SIZE, ®s->oep[i]);
159 for (i = 0; i < 4; ++i) {
160 writel(FIFOCSR_RESET, ®s->fifocsr[i]);
162 if (readl(®s->fifocsr[i]) & FIFOCSR_RESET) {
163 printf("fotg210: fifo%d reset failed\n", i);
168 /* enable only device interrupt and triggered at level-high */
169 writel(IMR_IRQLH | IMR_HOST | IMR_OTG, ®s->imr);
170 writel(ISR_MASK, ®s->isr);
171 /* disable EP0 IN/OUT interrupt */
172 writel(GIMR0_CXOUT | GIMR0_CXIN, ®s->gimr0);
173 /* disable EPX IN+SPK+OUT interrupts */
174 writel(GIMR1_MASK, ®s->gimr1);
175 /* disable wakeup+idle+dma+zlp interrupts */
176 writel(GIMR2_WAKEUP | GIMR2_IDLE | GIMR2_DMAERR | GIMR2_DMAFIN
177 | GIMR2_ZLPRX | GIMR2_ZLPTX, ®s->gimr2);
178 /* enable all group interrupt */
179 writel(0, ®s->gimr);
181 /* suspend delay = 3 ms */
182 writel(3, ®s->idle);
184 /* turn-on device interrupts */
185 setbits_le32(®s->dev_ctrl, DEVCTRL_GIRQ_EN);
190 static inline int fotg210_cxwait(struct fotg210_chip *chip, uint32_t mask)
192 struct fotg210_regs *regs = chip->regs;
196 for (ts = get_timer(0); get_timer(ts) < CFG_CMD_TIMEOUT; ) {
197 if ((readl(®s->cxfifo) & mask) != mask)
204 printf("fotg210: cx/ep0 timeout\n");
209 static int fotg210_dma(struct fotg210_ep *ep, struct fotg210_request *req)
211 struct fotg210_chip *chip = ep->chip;
212 struct fotg210_regs *regs = chip->regs;
214 uint8_t *buf = req->req.buf + req->req.actual;
215 uint32_t len = req->req.length - req->req.actual;
216 int fifo = ep_to_fifo(chip, ep->id);
219 /* 1. init dma buffer */
220 if (len > ep->maxpacket)
223 /* 2. wait for dma ready (hardware) */
224 for (ts = get_timer(0); get_timer(ts) < CFG_CMD_TIMEOUT; ) {
225 if (!(readl(®s->dma_ctrl) & DMACTRL_START)) {
231 printf("fotg210: dma busy\n");
232 req->req.status = ret;
236 /* 3. DMA target setup */
237 if (ep->desc->bEndpointAddress & USB_DIR_IN)
238 flush_dcache_range((ulong)buf, (ulong)buf + len);
240 invalidate_dcache_range((ulong)buf, (ulong)buf + len);
242 writel(virt_to_phys(buf), ®s->dma_addr);
244 if (ep->desc->bEndpointAddress & USB_DIR_IN) {
246 /* Wait until cx/ep0 fifo empty */
247 fotg210_cxwait(chip, CXFIFO_CXFIFOE);
249 writel(DMAFIFO_CX, ®s->dma_fifo);
251 /* Wait until epx fifo empty */
252 fotg210_cxwait(chip, CXFIFO_FIFOE(fifo));
253 writel(DMAFIFO_FIFO(fifo), ®s->dma_fifo);
255 writel(DMACTRL_LEN(len) | DMACTRL_MEM2FIFO, ®s->dma_ctrl);
260 writel(DMAFIFO_CX, ®s->dma_fifo);
262 blen = CXFIFO_BYTES(readl(®s->cxfifo));
263 } while (blen < len);
265 writel(DMAFIFO_FIFO(fifo), ®s->dma_fifo);
266 blen = FIFOCSR_BYTES(readl(®s->fifocsr[fifo]));
268 len = (len < blen) ? len : blen;
269 writel(DMACTRL_LEN(len) | DMACTRL_FIFO2MEM, ®s->dma_ctrl);
273 setbits_le32(®s->dma_ctrl, DMACTRL_START);
277 for (ts = get_timer(0); get_timer(ts) < CFG_CMD_TIMEOUT; ) {
278 tmp = readl(®s->gisr2);
280 if (tmp & GISR2_DMAFIN) {
285 if (tmp & GISR2_DMAERR) {
286 printf("fotg210: dma error\n");
289 /* resume, suspend, reset */
290 if (tmp & (GISR2_RESUME | GISR2_SUSPEND | GISR2_RESET)) {
291 printf("fotg210: dma reset by host\n");
296 /* 7. DMA target reset */
298 writel(DMACTRL_ABORT | DMACTRL_CLRFF, ®s->dma_ctrl);
300 writel(0, ®s->gisr2);
301 writel(0, ®s->dma_fifo);
303 req->req.status = ret;
305 req->req.actual += len;
307 printf("fotg210: ep%d dma error(code=%d)\n", ep->id, ret);
313 * result of setup packet
319 static void fotg210_setup(struct fotg210_chip *chip)
321 int id, ret = CX_IDLE;
323 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)tmp;
324 struct fotg210_regs *regs = chip->regs;
327 * If this is the first Cx 8 byte command,
328 * we can now query USB mode (high/full speed; USB 2.0/USB 1.0)
330 if (chip->state == USB_STATE_POWERED) {
331 chip->state = USB_STATE_DEFAULT;
332 if (readl(®s->otgcsr) & OTGCSR_DEV_B) {
334 if (readl(®s->dev_ctrl) & DEVCTRL_HS) {
335 puts("fotg210: HS\n");
336 chip->gadget.speed = USB_SPEED_HIGH;
337 /* SOF mask timer = 1100 ticks */
338 writel(SOFMTR_TMR(1100), ®s->sof_mtr);
340 puts("fotg210: FS\n");
341 chip->gadget.speed = USB_SPEED_FULL;
342 /* SOF mask timer = 10000 ticks */
343 writel(SOFMTR_TMR(10000), ®s->sof_mtr);
346 printf("fotg210: mini-A?\n");
350 /* switch data port to ep0 */
351 writel(DMAFIFO_CX, ®s->dma_fifo);
352 /* fetch 8 bytes setup packet */
353 tmp[0] = readl(®s->ep0_data);
354 tmp[1] = readl(®s->ep0_data);
355 /* release data port */
356 writel(0, ®s->dma_fifo);
358 if (req->bRequestType & USB_DIR_IN)
359 ep0_desc.bEndpointAddress = USB_DIR_IN;
361 ep0_desc.bEndpointAddress = USB_DIR_OUT;
365 if ((req->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
366 switch (req->bRequest) {
367 case USB_REQ_SET_CONFIGURATION:
368 debug("fotg210: set_cfg(%d)\n", req->wValue & 0x00FF);
369 if (!(req->wValue & 0x00FF)) {
370 chip->state = USB_STATE_ADDRESS;
371 writel(chip->addr, ®s->dev_addr);
373 chip->state = USB_STATE_CONFIGURED;
374 writel(chip->addr | DEVADDR_CONF,
380 case USB_REQ_SET_ADDRESS:
381 debug("fotg210: set_addr(0x%04X)\n", req->wValue);
382 chip->state = USB_STATE_ADDRESS;
383 chip->addr = req->wValue & DEVADDR_ADDR_MASK;
385 writel(chip->addr, ®s->dev_addr);
388 case USB_REQ_CLEAR_FEATURE:
389 debug("fotg210: clr_feature(%d, %d)\n",
390 req->bRequestType & 0x03, req->wValue);
391 switch (req->wValue) {
392 case 0: /* [Endpoint] halt */
393 ep_reset(chip, req->wIndex);
396 case 1: /* [Device] remote wake-up */
397 case 2: /* [Device] test mode */
404 case USB_REQ_SET_FEATURE:
405 debug("fotg210: set_feature(%d, %d)\n",
406 req->wValue, req->wIndex & 0xf);
407 switch (req->wValue) {
408 case 0: /* Endpoint Halt */
409 id = req->wIndex & 0xf;
410 setbits_le32(®s->iep[id - 1], IEP_STALL);
411 setbits_le32(®s->oep[id - 1], OEP_STALL);
414 case 1: /* Remote Wakeup */
415 case 2: /* Test Mode */
422 case USB_REQ_GET_STATUS:
423 debug("fotg210: get_status\n");
427 case USB_REQ_SET_DESCRIPTOR:
428 debug("fotg210: set_descriptor\n");
432 case USB_REQ_SYNCH_FRAME:
433 debug("fotg210: sync frame\n");
437 } /* if ((req->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) */
439 if (ret == CX_IDLE && chip->driver->setup) {
440 if (chip->driver->setup(&chip->gadget, req) < 0)
448 setbits_le32(®s->cxfifo, CXFIFO_CXFIN);
452 setbits_le32(®s->cxfifo, CXFIFO_CXSTALL | CXFIFO_CXFIN);
453 printf("fotg210: cx_stall!\n");
457 debug("fotg210: cx_idle?\n");
465 * zlp - zero length packet
467 static void fotg210_recv(struct fotg210_chip *chip, int ep_id)
469 struct fotg210_regs *regs = chip->regs;
470 struct fotg210_ep *ep = chip->ep + ep_id;
471 struct fotg210_request *req;
474 if (ep->stopped || (ep->desc->bEndpointAddress & USB_DIR_IN)) {
475 printf("fotg210: ep%d recv, invalid!\n", ep->id);
479 if (list_empty(&ep->queue)) {
480 printf("fotg210: ep%d recv, drop!\n", ep->id);
484 req = list_first_entry(&ep->queue, struct fotg210_request, queue);
485 len = fotg210_dma(ep, req);
486 if (len < ep->ep.maxpacket || req->req.length <= req->req.actual) {
487 list_del_init(&req->queue);
488 if (req->req.complete)
489 req->req.complete(&ep->ep, &req->req);
492 if (ep->id > 0 && list_empty(&ep->queue)) {
493 setbits_le32(®s->gimr1,
494 GIMR1_FIFO_RX(ep_to_fifo(chip, ep->id)));
501 static int fotg210_ep_enable(
502 struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
504 struct fotg210_ep *ep = container_of(_ep, struct fotg210_ep, ep);
505 struct fotg210_chip *chip = ep->chip;
506 struct fotg210_regs *regs = chip->regs;
507 int id = ep_to_fifo(chip, ep->id);
508 int in = (desc->bEndpointAddress & USB_DIR_IN) ? 1 : 0;
511 || desc->bDescriptorType != USB_DT_ENDPOINT
512 || le16_to_cpu(desc->wMaxPacketSize) == 0) {
513 printf("fotg210: bad ep or descriptor\n");
521 setbits_le32(®s->fifomap, FIFOMAP(id, FIFOMAP_IN));
523 switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
524 case USB_ENDPOINT_XFER_CONTROL:
527 case USB_ENDPOINT_XFER_ISOC:
528 setbits_le32(®s->fifocfg,
529 FIFOCFG(id, FIFOCFG_EN | FIFOCFG_ISOC));
532 case USB_ENDPOINT_XFER_BULK:
533 setbits_le32(®s->fifocfg,
534 FIFOCFG(id, FIFOCFG_EN | FIFOCFG_BULK));
537 case USB_ENDPOINT_XFER_INT:
538 setbits_le32(®s->fifocfg,
539 FIFOCFG(id, FIFOCFG_EN | FIFOCFG_INTR));
546 static int fotg210_ep_disable(struct usb_ep *_ep)
548 struct fotg210_ep *ep = container_of(_ep, struct fotg210_ep, ep);
549 struct fotg210_chip *chip = ep->chip;
550 struct fotg210_regs *regs = chip->regs;
551 int id = ep_to_fifo(chip, ep->id);
556 clrbits_le32(®s->fifocfg, FIFOCFG(id, FIFOCFG_CFG_MASK));
557 clrbits_le32(®s->fifomap, FIFOMAP(id, FIFOMAP_DIR_MASK));
562 static struct usb_request *fotg210_ep_alloc_request(
563 struct usb_ep *_ep, gfp_t gfp_flags)
565 struct fotg210_request *req = malloc(sizeof(*req));
568 memset(req, 0, sizeof(*req));
569 INIT_LIST_HEAD(&req->queue);
574 static void fotg210_ep_free_request(
575 struct usb_ep *_ep, struct usb_request *_req)
577 struct fotg210_request *req;
579 req = container_of(_req, struct fotg210_request, req);
583 static int fotg210_ep_queue(
584 struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
586 struct fotg210_ep *ep = container_of(_ep, struct fotg210_ep, ep);
587 struct fotg210_chip *chip = ep->chip;
588 struct fotg210_regs *regs = chip->regs;
589 struct fotg210_request *req;
591 req = container_of(_req, struct fotg210_request, req);
592 if (!_req || !_req->complete || !_req->buf
593 || !list_empty(&req->queue)) {
594 printf("fotg210: invalid request to ep%d\n", ep->id);
598 if (!chip || chip->state == USB_STATE_SUSPENDED) {
599 printf("fotg210: request while chip suspended\n");
604 req->req.status = -EINPROGRESS;
606 if (req->req.length == 0) {
608 if (req->req.complete)
609 req->req.complete(&ep->ep, &req->req);
615 int len = fotg210_dma(ep, req);
616 if (len < ep->ep.maxpacket)
618 if (ep->desc->bEndpointAddress & USB_DIR_IN)
620 } while (req->req.length > req->req.actual);
622 if (ep->desc->bEndpointAddress & USB_DIR_IN) {
624 int len = fotg210_dma(ep, req);
625 if (len < ep->ep.maxpacket)
627 } while (req->req.length > req->req.actual);
629 list_add_tail(&req->queue, &ep->queue);
630 clrbits_le32(®s->gimr1,
631 GIMR1_FIFO_RX(ep_to_fifo(chip, ep->id)));
635 if (ep->id == 0 || (ep->desc->bEndpointAddress & USB_DIR_IN)) {
636 if (req->req.complete)
637 req->req.complete(&ep->ep, &req->req);
643 static int fotg210_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
645 struct fotg210_ep *ep = container_of(_ep, struct fotg210_ep, ep);
646 struct fotg210_request *req;
648 /* make sure it's actually queued on this endpoint */
649 list_for_each_entry(req, &ep->queue, queue) {
650 if (&req->req == _req)
653 if (&req->req != _req)
656 /* remove the request */
657 list_del_init(&req->queue);
659 /* update status & invoke complete callback */
660 if (req->req.status == -EINPROGRESS) {
661 req->req.status = -ECONNRESET;
662 if (req->req.complete)
663 req->req.complete(_ep, &req->req);
669 static int fotg210_ep_halt(struct usb_ep *_ep, int halt)
671 struct fotg210_ep *ep = container_of(_ep, struct fotg210_ep, ep);
672 struct fotg210_chip *chip = ep->chip;
673 struct fotg210_regs *regs = chip->regs;
676 debug("fotg210: ep%d halt=%d\n", ep->id, halt);
679 if (ep->id > 0 && ep->id <= CFG_NUM_ENDPOINTS) {
681 /* wait until all ep fifo empty */
682 fotg210_cxwait(chip, 0xf00);
684 if (ep->desc->bEndpointAddress & USB_DIR_IN) {
685 setbits_le32(®s->iep[ep->id - 1],
688 setbits_le32(®s->oep[ep->id - 1],
692 if (ep->desc->bEndpointAddress & USB_DIR_IN) {
693 clrbits_le32(®s->iep[ep->id - 1],
696 clrbits_le32(®s->oep[ep->id - 1],
707 * activate/deactivate link with host.
709 static void pullup(struct fotg210_chip *chip, int is_on)
711 struct fotg210_regs *regs = chip->regs;
715 chip->state = USB_STATE_POWERED;
717 /* enable the chip */
718 setbits_le32(®s->dev_ctrl, DEVCTRL_EN);
719 /* clear unplug bit (BIT0) */
720 clrbits_le32(®s->phy_tmsr, PHYTMSR_UNPLUG);
723 chip->state = USB_STATE_NOTATTACHED;
726 writel(chip->addr, ®s->dev_addr);
727 /* set unplug bit (BIT0) */
728 setbits_le32(®s->phy_tmsr, PHYTMSR_UNPLUG);
729 /* disable the chip */
730 clrbits_le32(®s->dev_ctrl, DEVCTRL_EN);
734 static int fotg210_pullup(struct usb_gadget *_gadget, int is_on)
736 struct fotg210_chip *chip;
738 chip = container_of(_gadget, struct fotg210_chip, gadget);
740 debug("fotg210: pullup=%d\n", is_on);
747 static int fotg210_get_frame(struct usb_gadget *_gadget)
749 struct fotg210_chip *chip;
750 struct fotg210_regs *regs;
752 chip = container_of(_gadget, struct fotg210_chip, gadget);
755 return SOFFNR_FNR(readl(®s->sof_fnr));
758 static struct usb_gadget_ops fotg210_gadget_ops = {
759 .get_frame = fotg210_get_frame,
760 .pullup = fotg210_pullup,
763 static struct usb_ep_ops fotg210_ep_ops = {
764 .enable = fotg210_ep_enable,
765 .disable = fotg210_ep_disable,
766 .queue = fotg210_ep_queue,
767 .dequeue = fotg210_ep_dequeue,
768 .set_halt = fotg210_ep_halt,
769 .alloc_request = fotg210_ep_alloc_request,
770 .free_request = fotg210_ep_free_request,
773 static struct fotg210_chip controller = {
774 .regs = (void __iomem *)CONFIG_FOTG210_BASE,
776 .name = "fotg210_udc",
777 .ops = &fotg210_gadget_ops,
778 .ep0 = &controller.ep[0].ep,
779 .speed = USB_SPEED_UNKNOWN,
782 .is_a_peripheral = 0,
785 .a_alt_hnp_support = 0,
791 .ops = &fotg210_ep_ops,
795 .maxpacket = CFG_EP0_MAX_PACKET_SIZE,
801 .ops = &fotg210_ep_ops,
804 .maxpacket = CFG_EPX_MAX_PACKET_SIZE,
810 .ops = &fotg210_ep_ops,
813 .maxpacket = CFG_EPX_MAX_PACKET_SIZE,
819 .ops = &fotg210_ep_ops,
822 .maxpacket = CFG_EPX_MAX_PACKET_SIZE,
828 .ops = &fotg210_ep_ops,
831 .maxpacket = CFG_EPX_MAX_PACKET_SIZE,
835 int usb_gadget_handle_interrupts(int index)
837 struct fotg210_chip *chip = &controller;
838 struct fotg210_regs *regs = chip->regs;
839 uint32_t id, st, isr, gisr;
841 isr = readl(®s->isr) & (~readl(®s->imr));
842 gisr = readl(®s->gisr) & (~readl(®s->gimr));
843 if (!(isr & ISR_DEV) || !gisr)
846 writel(ISR_DEV, ®s->isr);
849 if (gisr & GISR_GRP0) {
850 st = readl(®s->gisr0);
852 * Write 1 and then 0 works for both W1C & RW.
854 * HW v1.11.0+: It's a W1C register (write 1 clear)
855 * HW v1.10.0-: It's a R/W register (write 0 clear)
857 writel(st & GISR0_CXABORT, ®s->gisr0);
858 writel(0, ®s->gisr0);
860 if (st & GISR0_CXERR)
861 printf("fotg210: cmd error\n");
863 if (st & GISR0_CXABORT)
864 printf("fotg210: cmd abort\n");
866 if (st & GISR0_CXSETUP) /* setup */
868 else if (st & GISR0_CXEND) /* command finish */
869 setbits_le32(®s->cxfifo, CXFIFO_CXFIN);
872 /* FIFO interrupts */
873 if (gisr & GISR_GRP1) {
874 st = readl(®s->gisr1);
875 for (id = 0; id < 4; ++id) {
876 if (st & GISR1_RX_FIFO(id))
877 fotg210_recv(chip, fifo_to_ep(chip, id, 0));
881 /* Device Status Interrupts */
882 if (gisr & GISR_GRP2) {
883 st = readl(®s->gisr2);
885 * Write 1 and then 0 works for both W1C & RW.
887 * HW v1.11.0+: It's a W1C register (write 1 clear)
888 * HW v1.10.0-: It's a R/W register (write 0 clear)
890 writel(st, ®s->gisr2);
891 writel(0, ®s->gisr2);
893 if (st & GISR2_RESET)
894 printf("fotg210: reset by host\n");
895 else if (st & GISR2_SUSPEND)
896 printf("fotg210: suspend/removed\n");
897 else if (st & GISR2_RESUME)
898 printf("fotg210: resume\n");
901 if (st & GISR2_ISOCERR)
902 printf("fotg210: iso error\n");
903 if (st & GISR2_ISOCABT)
904 printf("fotg210: iso abort\n");
905 if (st & GISR2_DMAERR)
906 printf("fotg210: dma error\n");
912 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
915 struct fotg210_chip *chip = &controller;
917 if (!driver || !driver->bind || !driver->setup) {
918 puts("fotg210: bad parameter.\n");
922 INIT_LIST_HEAD(&chip->gadget.ep_list);
923 for (i = 0; i < CFG_NUM_ENDPOINTS + 1; ++i) {
924 struct fotg210_ep *ep = chip->ep + i;
926 ep->ep.maxpacket = ep->maxpacket;
927 INIT_LIST_HEAD(&ep->queue);
933 list_add_tail(&ep->ep.ep_list, &chip->gadget.ep_list);
937 if (fotg210_reset(chip)) {
938 puts("fotg210: reset failed.\n");
942 ret = driver->bind(&chip->gadget);
944 debug("fotg210: driver->bind() returned %d\n", ret);
947 chip->driver = driver;
952 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
954 struct fotg210_chip *chip = &controller;
956 driver->unbind(&chip->gadget);