2 * at91_udc -- driver for at91-series USB peripheral controller
4 * Copyright (C) 2004 by Thomas Rathbone
5 * Copyright (C) 2005 by HP Labs
6 * Copyright (C) 2005 by David Brownell
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/delay.h>
21 #include <linux/ioport.h>
22 #include <linux/slab.h>
23 #include <linux/errno.h>
24 #include <linux/init.h>
25 #include <linux/list.h>
26 #include <linux/interrupt.h>
27 #include <linux/proc_fs.h>
28 #include <linux/prefetch.h>
29 #include <linux/clk.h>
30 #include <linux/usb/ch9.h>
31 #include <linux/usb/gadget.h>
33 #include <linux/of_gpio.h>
34 #include <linux/platform_data/atmel.h>
36 #include <asm/byteorder.h>
37 #include <mach/hardware.h>
43 #include <mach/at91sam9261_matrix.h>
44 #include <mach/at91_matrix.h>
50 * This controller is simple and PIO-only. It's used in many AT91-series
51 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
52 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
54 * This driver expects the board has been wired with two GPIOs supporting
55 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the
56 * testing hasn't covered such cases.)
58 * The pullup is most important (so it's integrated on sam926x parts). It
59 * provides software control over whether the host enumerates the device.
61 * The VBUS sensing helps during enumeration, and allows both USB clocks
62 * (and the transceiver) to stay gated off until they're necessary, saving
63 * power. During USB suspend, the 48 MHz clock is gated off in hardware;
64 * it may also be gated off by software during some Linux sleep states.
67 #define DRIVER_VERSION "3 May 2006"
69 static const char driver_name
[] = "at91_udc";
70 static const char ep0name
[] = "ep0";
72 #define VBUS_POLL_TIMEOUT msecs_to_jiffies(1000)
74 #define at91_udp_read(udc, reg) \
75 __raw_readl((udc)->udp_baseaddr + (reg))
76 #define at91_udp_write(udc, reg, val) \
77 __raw_writel((val), (udc)->udp_baseaddr + (reg))
79 /*-------------------------------------------------------------------------*/
81 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
83 #include <linux/seq_file.h>
85 static const char debug_filename
[] = "driver/udc";
87 #define FOURBITS "%s%s%s%s"
88 #define EIGHTBITS FOURBITS FOURBITS
90 static void proc_ep_show(struct seq_file
*s
, struct at91_ep
*ep
)
92 static char *types
[] = {
93 "control", "out-iso", "out-bulk", "out-int",
94 "BOGUS", "in-iso", "in-bulk", "in-int"};
97 struct at91_request
*req
;
99 struct at91_udc
*udc
= ep
->udc
;
101 spin_lock_irqsave(&udc
->lock
, flags
);
103 csr
= __raw_readl(ep
->creg
);
105 /* NOTE: not collecting per-endpoint irq statistics... */
108 seq_printf(s
, "%s, maxpacket %d %s%s %s%s\n",
109 ep
->ep
.name
, ep
->ep
.maxpacket
,
110 ep
->is_in
? "in" : "out",
111 ep
->is_iso
? " iso" : "",
113 ? (ep
->fifo_bank
? "pong" : "ping")
115 ep
->stopped
? " stopped" : "");
116 seq_printf(s
, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS
"\n",
118 (csr
& 0x07ff0000) >> 16,
119 (csr
& (1 << 15)) ? "enabled" : "disabled",
120 (csr
& (1 << 11)) ? "DATA1" : "DATA0",
121 types
[(csr
& 0x700) >> 8],
123 /* iff type is control then print current direction */
125 ? ((csr
& (1 << 7)) ? " IN" : " OUT")
127 (csr
& (1 << 6)) ? " rxdatabk1" : "",
128 (csr
& (1 << 5)) ? " forcestall" : "",
129 (csr
& (1 << 4)) ? " txpktrdy" : "",
131 (csr
& (1 << 3)) ? " stallsent" : "",
132 (csr
& (1 << 2)) ? " rxsetup" : "",
133 (csr
& (1 << 1)) ? " rxdatabk0" : "",
134 (csr
& (1 << 0)) ? " txcomp" : "");
135 if (list_empty (&ep
->queue
))
136 seq_printf(s
, "\t(queue empty)\n");
138 else list_for_each_entry (req
, &ep
->queue
, queue
) {
139 unsigned length
= req
->req
.actual
;
141 seq_printf(s
, "\treq %p len %d/%d buf %p\n",
143 req
->req
.length
, req
->req
.buf
);
145 spin_unlock_irqrestore(&udc
->lock
, flags
);
148 static void proc_irq_show(struct seq_file
*s
, const char *label
, u32 mask
)
152 seq_printf(s
, "%s %04x:%s%s" FOURBITS
, label
, mask
,
153 (mask
& (1 << 13)) ? " wakeup" : "",
154 (mask
& (1 << 12)) ? " endbusres" : "",
156 (mask
& (1 << 11)) ? " sofint" : "",
157 (mask
& (1 << 10)) ? " extrsm" : "",
158 (mask
& (1 << 9)) ? " rxrsm" : "",
159 (mask
& (1 << 8)) ? " rxsusp" : "");
160 for (i
= 0; i
< 8; i
++) {
162 seq_printf(s
, " ep%d", i
);
167 static int proc_udc_show(struct seq_file
*s
, void *unused
)
169 struct at91_udc
*udc
= s
->private;
173 seq_printf(s
, "%s: version %s\n", driver_name
, DRIVER_VERSION
);
175 seq_printf(s
, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
176 udc
->vbus
? "present" : "off",
178 ? (udc
->vbus
? "active" : "enabled")
180 udc
->selfpowered
? "self" : "VBUS",
181 udc
->suspended
? ", suspended" : "",
182 udc
->driver
? udc
->driver
->driver
.name
: "(none)");
184 /* don't access registers when interface isn't clocked */
186 seq_printf(s
, "(not clocked)\n");
190 tmp
= at91_udp_read(udc
, AT91_UDP_FRM_NUM
);
191 seq_printf(s
, "frame %05x:%s%s frame=%d\n", tmp
,
192 (tmp
& AT91_UDP_FRM_OK
) ? " ok" : "",
193 (tmp
& AT91_UDP_FRM_ERR
) ? " err" : "",
194 (tmp
& AT91_UDP_NUM
));
196 tmp
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
197 seq_printf(s
, "glbstate %02x:%s" FOURBITS
"\n", tmp
,
198 (tmp
& AT91_UDP_RMWUPE
) ? " rmwupe" : "",
199 (tmp
& AT91_UDP_RSMINPR
) ? " rsminpr" : "",
200 (tmp
& AT91_UDP_ESR
) ? " esr" : "",
201 (tmp
& AT91_UDP_CONFG
) ? " confg" : "",
202 (tmp
& AT91_UDP_FADDEN
) ? " fadden" : "");
204 tmp
= at91_udp_read(udc
, AT91_UDP_FADDR
);
205 seq_printf(s
, "faddr %03x:%s fadd=%d\n", tmp
,
206 (tmp
& AT91_UDP_FEN
) ? " fen" : "",
207 (tmp
& AT91_UDP_FADD
));
209 proc_irq_show(s
, "imr ", at91_udp_read(udc
, AT91_UDP_IMR
));
210 proc_irq_show(s
, "isr ", at91_udp_read(udc
, AT91_UDP_ISR
));
212 if (udc
->enabled
&& udc
->vbus
) {
213 proc_ep_show(s
, &udc
->ep
[0]);
214 list_for_each_entry (ep
, &udc
->gadget
.ep_list
, ep
.ep_list
) {
222 static int proc_udc_open(struct inode
*inode
, struct file
*file
)
224 return single_open(file
, proc_udc_show
, PDE_DATA(inode
));
227 static const struct file_operations proc_ops
= {
228 .owner
= THIS_MODULE
,
229 .open
= proc_udc_open
,
232 .release
= single_release
,
235 static void create_debug_file(struct at91_udc
*udc
)
237 udc
->pde
= proc_create_data(debug_filename
, 0, NULL
, &proc_ops
, udc
);
240 static void remove_debug_file(struct at91_udc
*udc
)
243 remove_proc_entry(debug_filename
, NULL
);
248 static inline void create_debug_file(struct at91_udc
*udc
) {}
249 static inline void remove_debug_file(struct at91_udc
*udc
) {}
254 /*-------------------------------------------------------------------------*/
256 static void done(struct at91_ep
*ep
, struct at91_request
*req
, int status
)
258 unsigned stopped
= ep
->stopped
;
259 struct at91_udc
*udc
= ep
->udc
;
261 list_del_init(&req
->queue
);
262 if (req
->req
.status
== -EINPROGRESS
)
263 req
->req
.status
= status
;
265 status
= req
->req
.status
;
266 if (status
&& status
!= -ESHUTDOWN
)
267 VDBG("%s done %p, status %d\n", ep
->ep
.name
, req
, status
);
270 spin_unlock(&udc
->lock
);
271 req
->req
.complete(&ep
->ep
, &req
->req
);
272 spin_lock(&udc
->lock
);
273 ep
->stopped
= stopped
;
275 /* ep0 is always ready; other endpoints need a non-empty queue */
276 if (list_empty(&ep
->queue
) && ep
->int_mask
!= (1 << 0))
277 at91_udp_write(udc
, AT91_UDP_IDR
, ep
->int_mask
);
280 /*-------------------------------------------------------------------------*/
282 /* bits indicating OUT fifo has data ready */
283 #define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
286 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
287 * back most of the value you just read (because of side effects, including
288 * bits that may change after reading and before writing).
290 * Except when changing a specific bit, always write values which:
291 * - clear SET_FX bits (setting them could change something)
292 * - set CLR_FX bits (clearing them could change something)
294 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
295 * that shouldn't normally be changed.
297 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
298 * implying a need to wait for one write to complete (test relevant bits)
299 * before starting the next write. This shouldn't be an issue given how
300 * infrequently we write, except maybe for write-then-read idioms.
302 #define SET_FX (AT91_UDP_TXPKTRDY)
303 #define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \
304 | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
306 /* pull OUT packet data from the endpoint's fifo */
307 static int read_fifo (struct at91_ep
*ep
, struct at91_request
*req
)
309 u32 __iomem
*creg
= ep
->creg
;
310 u8 __iomem
*dreg
= ep
->creg
+ (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
313 unsigned int count
, bufferspace
, is_done
;
315 buf
= req
->req
.buf
+ req
->req
.actual
;
316 bufferspace
= req
->req
.length
- req
->req
.actual
;
319 * there might be nothing to read if ep_queue() calls us,
320 * or if we already emptied both pingpong buffers
323 csr
= __raw_readl(creg
);
324 if ((csr
& RX_DATA_READY
) == 0)
327 count
= (csr
& AT91_UDP_RXBYTECNT
) >> 16;
328 if (count
> ep
->ep
.maxpacket
)
329 count
= ep
->ep
.maxpacket
;
330 if (count
> bufferspace
) {
331 DBG("%s buffer overflow\n", ep
->ep
.name
);
332 req
->req
.status
= -EOVERFLOW
;
335 __raw_readsb(dreg
, buf
, count
);
337 /* release and swap pingpong mem bank */
339 if (ep
->is_pingpong
) {
340 if (ep
->fifo_bank
== 0) {
341 csr
&= ~(SET_FX
| AT91_UDP_RX_DATA_BK0
);
344 csr
&= ~(SET_FX
| AT91_UDP_RX_DATA_BK1
);
348 csr
&= ~(SET_FX
| AT91_UDP_RX_DATA_BK0
);
349 __raw_writel(csr
, creg
);
351 req
->req
.actual
+= count
;
352 is_done
= (count
< ep
->ep
.maxpacket
);
353 if (count
== bufferspace
)
356 PACKET("%s %p out/%d%s\n", ep
->ep
.name
, &req
->req
, count
,
357 is_done
? " (done)" : "");
360 * avoid extra trips through IRQ logic for packets already in
361 * the fifo ... maybe preventing an extra (expensive) OUT-NAK
365 else if (ep
->is_pingpong
) {
367 * One dummy read to delay the code because of a HW glitch:
368 * CSR returns bad RXCOUNT when read too soon after updating
371 csr
= __raw_readl(creg
);
373 bufferspace
-= count
;
381 /* load fifo for an IN packet */
382 static int write_fifo(struct at91_ep
*ep
, struct at91_request
*req
)
384 u32 __iomem
*creg
= ep
->creg
;
385 u32 csr
= __raw_readl(creg
);
386 u8 __iomem
*dreg
= ep
->creg
+ (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
387 unsigned total
, count
, is_last
;
391 * TODO: allow for writing two packets to the fifo ... that'll
392 * reduce the amount of IN-NAKing, but probably won't affect
393 * throughput much. (Unlike preventing OUT-NAKing!)
397 * If ep_queue() calls us, the queue is empty and possibly in
398 * odd states like TXCOMP not yet cleared (we do it, saving at
399 * least one IRQ) or the fifo not yet being free. Those aren't
400 * issues normally (IRQ handler fast path).
402 if (unlikely(csr
& (AT91_UDP_TXCOMP
| AT91_UDP_TXPKTRDY
))) {
403 if (csr
& AT91_UDP_TXCOMP
) {
405 csr
&= ~(SET_FX
| AT91_UDP_TXCOMP
);
406 __raw_writel(csr
, creg
);
407 csr
= __raw_readl(creg
);
409 if (csr
& AT91_UDP_TXPKTRDY
)
413 buf
= req
->req
.buf
+ req
->req
.actual
;
415 total
= req
->req
.length
- req
->req
.actual
;
416 if (ep
->ep
.maxpacket
< total
) {
417 count
= ep
->ep
.maxpacket
;
421 is_last
= (count
< ep
->ep
.maxpacket
) || !req
->req
.zero
;
425 * Write the packet, maybe it's a ZLP.
427 * NOTE: incrementing req->actual before we receive the ACK means
428 * gadget driver IN bytecounts can be wrong in fault cases. That's
429 * fixable with PIO drivers like this one (save "count" here, and
430 * do the increment later on TX irq), but not for most DMA hardware.
432 * So all gadget drivers must accept that potential error. Some
433 * hardware supports precise fifo status reporting, letting them
434 * recover when the actual bytecount matters (e.g. for USB Test
435 * and Measurement Class devices).
437 __raw_writesb(dreg
, buf
, count
);
439 csr
|= CLR_FX
| AT91_UDP_TXPKTRDY
;
440 __raw_writel(csr
, creg
);
441 req
->req
.actual
+= count
;
443 PACKET("%s %p in/%d%s\n", ep
->ep
.name
, &req
->req
, count
,
444 is_last
? " (done)" : "");
450 static void nuke(struct at91_ep
*ep
, int status
)
452 struct at91_request
*req
;
454 /* terminate any request in the queue */
456 if (list_empty(&ep
->queue
))
459 VDBG("%s %s\n", __func__
, ep
->ep
.name
);
460 while (!list_empty(&ep
->queue
)) {
461 req
= list_entry(ep
->queue
.next
, struct at91_request
, queue
);
462 done(ep
, req
, status
);
466 /*-------------------------------------------------------------------------*/
468 static int at91_ep_enable(struct usb_ep
*_ep
,
469 const struct usb_endpoint_descriptor
*desc
)
471 struct at91_ep
*ep
= container_of(_ep
, struct at91_ep
, ep
);
472 struct at91_udc
*udc
;
478 || !desc
|| _ep
->name
== ep0name
479 || desc
->bDescriptorType
!= USB_DT_ENDPOINT
480 || (maxpacket
= usb_endpoint_maxp(desc
)) == 0
481 || maxpacket
> ep
->maxpacket
) {
482 DBG("bad ep or descriptor\n");
487 if (!udc
->driver
|| udc
->gadget
.speed
== USB_SPEED_UNKNOWN
) {
488 DBG("bogus device state\n");
492 tmp
= usb_endpoint_type(desc
);
494 case USB_ENDPOINT_XFER_CONTROL
:
495 DBG("only one control endpoint\n");
497 case USB_ENDPOINT_XFER_INT
:
501 case USB_ENDPOINT_XFER_BULK
:
510 DBG("bogus maxpacket %d\n", maxpacket
);
512 case USB_ENDPOINT_XFER_ISOC
:
513 if (!ep
->is_pingpong
) {
514 DBG("iso requires double buffering\n");
521 spin_lock_irqsave(&udc
->lock
, flags
);
523 /* initialize endpoint to match this descriptor */
524 ep
->is_in
= usb_endpoint_dir_in(desc
);
525 ep
->is_iso
= (tmp
== USB_ENDPOINT_XFER_ISOC
);
530 tmp
|= AT91_UDP_EPEDS
;
531 __raw_writel(tmp
, ep
->creg
);
533 ep
->ep
.maxpacket
= maxpacket
;
536 * reset/init endpoint fifo. NOTE: leaves fifo_bank alone,
537 * since endpoint resets don't reset hw pingpong state.
539 at91_udp_write(udc
, AT91_UDP_RST_EP
, ep
->int_mask
);
540 at91_udp_write(udc
, AT91_UDP_RST_EP
, 0);
542 spin_unlock_irqrestore(&udc
->lock
, flags
);
546 static int at91_ep_disable (struct usb_ep
* _ep
)
548 struct at91_ep
*ep
= container_of(_ep
, struct at91_ep
, ep
);
549 struct at91_udc
*udc
= ep
->udc
;
552 if (ep
== &ep
->udc
->ep
[0])
555 spin_lock_irqsave(&udc
->lock
, flags
);
557 nuke(ep
, -ESHUTDOWN
);
559 /* restore the endpoint's pristine config */
561 ep
->ep
.maxpacket
= ep
->maxpacket
;
563 /* reset fifos and endpoint */
564 if (ep
->udc
->clocked
) {
565 at91_udp_write(udc
, AT91_UDP_RST_EP
, ep
->int_mask
);
566 at91_udp_write(udc
, AT91_UDP_RST_EP
, 0);
567 __raw_writel(0, ep
->creg
);
570 spin_unlock_irqrestore(&udc
->lock
, flags
);
575 * this is a PIO-only driver, so there's nothing
576 * interesting for request or buffer allocation.
579 static struct usb_request
*
580 at91_ep_alloc_request(struct usb_ep
*_ep
, gfp_t gfp_flags
)
582 struct at91_request
*req
;
584 req
= kzalloc(sizeof (struct at91_request
), gfp_flags
);
588 INIT_LIST_HEAD(&req
->queue
);
592 static void at91_ep_free_request(struct usb_ep
*_ep
, struct usb_request
*_req
)
594 struct at91_request
*req
;
596 req
= container_of(_req
, struct at91_request
, req
);
597 BUG_ON(!list_empty(&req
->queue
));
601 static int at91_ep_queue(struct usb_ep
*_ep
,
602 struct usb_request
*_req
, gfp_t gfp_flags
)
604 struct at91_request
*req
;
606 struct at91_udc
*udc
;
610 req
= container_of(_req
, struct at91_request
, req
);
611 ep
= container_of(_ep
, struct at91_ep
, ep
);
613 if (!_req
|| !_req
->complete
614 || !_req
->buf
|| !list_empty(&req
->queue
)) {
615 DBG("invalid request\n");
619 if (!_ep
|| (!ep
->ep
.desc
&& ep
->ep
.name
!= ep0name
)) {
626 if (!udc
|| !udc
->driver
|| udc
->gadget
.speed
== USB_SPEED_UNKNOWN
) {
627 DBG("invalid device\n");
631 _req
->status
= -EINPROGRESS
;
634 spin_lock_irqsave(&udc
->lock
, flags
);
636 /* try to kickstart any empty and idle queue */
637 if (list_empty(&ep
->queue
) && !ep
->stopped
) {
641 * If this control request has a non-empty DATA stage, this
642 * will start that stage. It works just like a non-control
643 * request (until the status stage starts, maybe early).
645 * If the data stage is empty, then this starts a successful
646 * IN/STATUS stage. (Unsuccessful ones use set_halt.)
648 is_ep0
= (ep
->ep
.name
== ep0name
);
652 if (!udc
->req_pending
) {
658 * defer changing CONFG until after the gadget driver
659 * reconfigures the endpoints.
661 if (udc
->wait_for_config_ack
) {
662 tmp
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
663 tmp
^= AT91_UDP_CONFG
;
664 VDBG("toggle config\n");
665 at91_udp_write(udc
, AT91_UDP_GLB_STAT
, tmp
);
667 if (req
->req
.length
== 0) {
669 PACKET("ep0 in/status\n");
671 tmp
= __raw_readl(ep
->creg
);
673 tmp
|= CLR_FX
| AT91_UDP_TXPKTRDY
;
674 __raw_writel(tmp
, ep
->creg
);
675 udc
->req_pending
= 0;
681 status
= write_fifo(ep
, req
);
683 status
= read_fifo(ep
, req
);
685 /* IN/STATUS stage is otherwise triggered by irq */
686 if (status
&& is_ep0
)
692 if (req
&& !status
) {
693 list_add_tail (&req
->queue
, &ep
->queue
);
694 at91_udp_write(udc
, AT91_UDP_IER
, ep
->int_mask
);
697 spin_unlock_irqrestore(&udc
->lock
, flags
);
698 return (status
< 0) ? status
: 0;
701 static int at91_ep_dequeue(struct usb_ep
*_ep
, struct usb_request
*_req
)
704 struct at91_request
*req
;
706 struct at91_udc
*udc
;
708 ep
= container_of(_ep
, struct at91_ep
, ep
);
709 if (!_ep
|| ep
->ep
.name
== ep0name
)
714 spin_lock_irqsave(&udc
->lock
, flags
);
716 /* make sure it's actually queued on this endpoint */
717 list_for_each_entry (req
, &ep
->queue
, queue
) {
718 if (&req
->req
== _req
)
721 if (&req
->req
!= _req
) {
722 spin_unlock_irqrestore(&udc
->lock
, flags
);
726 done(ep
, req
, -ECONNRESET
);
727 spin_unlock_irqrestore(&udc
->lock
, flags
);
731 static int at91_ep_set_halt(struct usb_ep
*_ep
, int value
)
733 struct at91_ep
*ep
= container_of(_ep
, struct at91_ep
, ep
);
734 struct at91_udc
*udc
= ep
->udc
;
740 if (!_ep
|| ep
->is_iso
|| !ep
->udc
->clocked
)
744 spin_lock_irqsave(&udc
->lock
, flags
);
746 csr
= __raw_readl(creg
);
749 * fail with still-busy IN endpoints, ensuring correct sequencing
750 * of data tx then stall. note that the fifo rx bytecount isn't
751 * completely accurate as a tx bytecount.
753 if (ep
->is_in
&& (!list_empty(&ep
->queue
) || (csr
>> 16) != 0))
759 csr
|= AT91_UDP_FORCESTALL
;
760 VDBG("halt %s\n", ep
->ep
.name
);
762 at91_udp_write(udc
, AT91_UDP_RST_EP
, ep
->int_mask
);
763 at91_udp_write(udc
, AT91_UDP_RST_EP
, 0);
764 csr
&= ~AT91_UDP_FORCESTALL
;
766 __raw_writel(csr
, creg
);
769 spin_unlock_irqrestore(&udc
->lock
, flags
);
773 static const struct usb_ep_ops at91_ep_ops
= {
774 .enable
= at91_ep_enable
,
775 .disable
= at91_ep_disable
,
776 .alloc_request
= at91_ep_alloc_request
,
777 .free_request
= at91_ep_free_request
,
778 .queue
= at91_ep_queue
,
779 .dequeue
= at91_ep_dequeue
,
780 .set_halt
= at91_ep_set_halt
,
781 /* there's only imprecise fifo status reporting */
784 /*-------------------------------------------------------------------------*/
786 static int at91_get_frame(struct usb_gadget
*gadget
)
788 struct at91_udc
*udc
= to_udc(gadget
);
790 if (!to_udc(gadget
)->clocked
)
792 return at91_udp_read(udc
, AT91_UDP_FRM_NUM
) & AT91_UDP_NUM
;
795 static int at91_wakeup(struct usb_gadget
*gadget
)
797 struct at91_udc
*udc
= to_udc(gadget
);
799 int status
= -EINVAL
;
802 DBG("%s\n", __func__
);
803 spin_lock_irqsave(&udc
->lock
, flags
);
805 if (!udc
->clocked
|| !udc
->suspended
)
808 /* NOTE: some "early versions" handle ESR differently ... */
810 glbstate
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
811 if (!(glbstate
& AT91_UDP_ESR
))
813 glbstate
|= AT91_UDP_ESR
;
814 at91_udp_write(udc
, AT91_UDP_GLB_STAT
, glbstate
);
817 spin_unlock_irqrestore(&udc
->lock
, flags
);
821 /* reinit == restore initial software state */
822 static void udc_reinit(struct at91_udc
*udc
)
826 INIT_LIST_HEAD(&udc
->gadget
.ep_list
);
827 INIT_LIST_HEAD(&udc
->gadget
.ep0
->ep_list
);
829 for (i
= 0; i
< NUM_ENDPOINTS
; i
++) {
830 struct at91_ep
*ep
= &udc
->ep
[i
];
833 list_add_tail(&ep
->ep
.ep_list
, &udc
->gadget
.ep_list
);
837 ep
->ep
.maxpacket
= ep
->maxpacket
;
838 ep
->creg
= (void __iomem
*) udc
->udp_baseaddr
+ AT91_UDP_CSR(i
);
839 /* initialize one queue per endpoint */
840 INIT_LIST_HEAD(&ep
->queue
);
844 static void stop_activity(struct at91_udc
*udc
)
846 struct usb_gadget_driver
*driver
= udc
->driver
;
849 if (udc
->gadget
.speed
== USB_SPEED_UNKNOWN
)
851 udc
->gadget
.speed
= USB_SPEED_UNKNOWN
;
854 for (i
= 0; i
< NUM_ENDPOINTS
; i
++) {
855 struct at91_ep
*ep
= &udc
->ep
[i
];
857 nuke(ep
, -ESHUTDOWN
);
860 spin_unlock(&udc
->lock
);
861 driver
->disconnect(&udc
->gadget
);
862 spin_lock(&udc
->lock
);
868 static void clk_on(struct at91_udc
*udc
)
873 clk_enable(udc
->iclk
);
874 clk_enable(udc
->fclk
);
877 static void clk_off(struct at91_udc
*udc
)
882 udc
->gadget
.speed
= USB_SPEED_UNKNOWN
;
883 clk_disable(udc
->fclk
);
884 clk_disable(udc
->iclk
);
888 * activate/deactivate link with host; minimize power usage for
889 * inactive links by cutting clocks and transceiver power.
891 static void pullup(struct at91_udc
*udc
, int is_on
)
893 int active
= !udc
->board
.pullup_active_low
;
895 if (!udc
->enabled
|| !udc
->vbus
)
897 DBG("%sactive\n", is_on
? "" : "in");
901 at91_udp_write(udc
, AT91_UDP_ICR
, AT91_UDP_RXRSM
);
902 at91_udp_write(udc
, AT91_UDP_TXVC
, 0);
903 if (cpu_is_at91rm9200())
904 gpio_set_value(udc
->board
.pullup_pin
, active
);
905 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
906 u32 txvc
= at91_udp_read(udc
, AT91_UDP_TXVC
);
908 txvc
|= AT91_UDP_TXVC_PUON
;
909 at91_udp_write(udc
, AT91_UDP_TXVC
, txvc
);
910 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
913 usbpucr
= at91_matrix_read(AT91_MATRIX_USBPUCR
);
914 usbpucr
|= AT91_MATRIX_USBPUCR_PUON
;
915 at91_matrix_write(AT91_MATRIX_USBPUCR
, usbpucr
);
919 at91_udp_write(udc
, AT91_UDP_IDR
, AT91_UDP_RXRSM
);
920 at91_udp_write(udc
, AT91_UDP_TXVC
, AT91_UDP_TXVC_TXVDIS
);
921 if (cpu_is_at91rm9200())
922 gpio_set_value(udc
->board
.pullup_pin
, !active
);
923 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
924 u32 txvc
= at91_udp_read(udc
, AT91_UDP_TXVC
);
926 txvc
&= ~AT91_UDP_TXVC_PUON
;
927 at91_udp_write(udc
, AT91_UDP_TXVC
, txvc
);
928 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
931 usbpucr
= at91_matrix_read(AT91_MATRIX_USBPUCR
);
932 usbpucr
&= ~AT91_MATRIX_USBPUCR_PUON
;
933 at91_matrix_write(AT91_MATRIX_USBPUCR
, usbpucr
);
939 /* vbus is here! turn everything on that's ready */
940 static int at91_vbus_session(struct usb_gadget
*gadget
, int is_active
)
942 struct at91_udc
*udc
= to_udc(gadget
);
945 /* VDBG("vbus %s\n", is_active ? "on" : "off"); */
946 spin_lock_irqsave(&udc
->lock
, flags
);
947 udc
->vbus
= (is_active
!= 0);
949 pullup(udc
, is_active
);
952 spin_unlock_irqrestore(&udc
->lock
, flags
);
956 static int at91_pullup(struct usb_gadget
*gadget
, int is_on
)
958 struct at91_udc
*udc
= to_udc(gadget
);
961 spin_lock_irqsave(&udc
->lock
, flags
);
962 udc
->enabled
= is_on
= !!is_on
;
964 spin_unlock_irqrestore(&udc
->lock
, flags
);
968 static int at91_set_selfpowered(struct usb_gadget
*gadget
, int is_on
)
970 struct at91_udc
*udc
= to_udc(gadget
);
973 spin_lock_irqsave(&udc
->lock
, flags
);
974 udc
->selfpowered
= (is_on
!= 0);
975 spin_unlock_irqrestore(&udc
->lock
, flags
);
979 static int at91_start(struct usb_gadget
*gadget
,
980 struct usb_gadget_driver
*driver
);
981 static int at91_stop(struct usb_gadget
*gadget
,
982 struct usb_gadget_driver
*driver
);
983 static const struct usb_gadget_ops at91_udc_ops
= {
984 .get_frame
= at91_get_frame
,
985 .wakeup
= at91_wakeup
,
986 .set_selfpowered
= at91_set_selfpowered
,
987 .vbus_session
= at91_vbus_session
,
988 .pullup
= at91_pullup
,
989 .udc_start
= at91_start
,
990 .udc_stop
= at91_stop
,
993 * VBUS-powered devices may also also want to support bigger
994 * power budgets after an appropriate SET_CONFIGURATION.
996 /* .vbus_power = at91_vbus_power, */
999 /*-------------------------------------------------------------------------*/
1001 static int handle_ep(struct at91_ep
*ep
)
1003 struct at91_request
*req
;
1004 u32 __iomem
*creg
= ep
->creg
;
1005 u32 csr
= __raw_readl(creg
);
1007 if (!list_empty(&ep
->queue
))
1008 req
= list_entry(ep
->queue
.next
,
1009 struct at91_request
, queue
);
1014 if (csr
& (AT91_UDP_STALLSENT
| AT91_UDP_TXCOMP
)) {
1016 csr
&= ~(SET_FX
| AT91_UDP_STALLSENT
| AT91_UDP_TXCOMP
);
1017 __raw_writel(csr
, creg
);
1020 return write_fifo(ep
, req
);
1023 if (csr
& AT91_UDP_STALLSENT
) {
1024 /* STALLSENT bit == ISOERR */
1025 if (ep
->is_iso
&& req
)
1026 req
->req
.status
= -EILSEQ
;
1028 csr
&= ~(SET_FX
| AT91_UDP_STALLSENT
);
1029 __raw_writel(csr
, creg
);
1030 csr
= __raw_readl(creg
);
1032 if (req
&& (csr
& RX_DATA_READY
))
1033 return read_fifo(ep
, req
);
1040 struct usb_ctrlrequest r
;
1043 static void handle_setup(struct at91_udc
*udc
, struct at91_ep
*ep
, u32 csr
)
1045 u32 __iomem
*creg
= ep
->creg
;
1046 u8 __iomem
*dreg
= ep
->creg
+ (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
1047 unsigned rxcount
, i
= 0;
1052 /* read and ack SETUP; hard-fail for bogus packets */
1053 rxcount
= (csr
& AT91_UDP_RXBYTECNT
) >> 16;
1054 if (likely(rxcount
== 8)) {
1056 pkt
.raw
[i
++] = __raw_readb(dreg
);
1057 if (pkt
.r
.bRequestType
& USB_DIR_IN
) {
1058 csr
|= AT91_UDP_DIR
;
1061 csr
&= ~AT91_UDP_DIR
;
1065 /* REVISIT this happens sometimes under load; why?? */
1066 ERR("SETUP len %d, csr %08x\n", rxcount
, csr
);
1070 csr
&= ~(SET_FX
| AT91_UDP_RXSETUP
);
1071 __raw_writel(csr
, creg
);
1072 udc
->wait_for_addr_ack
= 0;
1073 udc
->wait_for_config_ack
= 0;
1075 if (unlikely(status
!= 0))
1078 #define w_index le16_to_cpu(pkt.r.wIndex)
1079 #define w_value le16_to_cpu(pkt.r.wValue)
1080 #define w_length le16_to_cpu(pkt.r.wLength)
1082 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1083 pkt
.r
.bRequestType
, pkt
.r
.bRequest
,
1084 w_value
, w_index
, w_length
);
1087 * A few standard requests get handled here, ones that touch
1088 * hardware ... notably for device and endpoint features.
1090 udc
->req_pending
= 1;
1091 csr
= __raw_readl(creg
);
1094 switch ((pkt
.r
.bRequestType
<< 8) | pkt
.r
.bRequest
) {
1096 case ((USB_TYPE_STANDARD
|USB_RECIP_DEVICE
) << 8)
1097 | USB_REQ_SET_ADDRESS
:
1098 __raw_writel(csr
| AT91_UDP_TXPKTRDY
, creg
);
1099 udc
->addr
= w_value
;
1100 udc
->wait_for_addr_ack
= 1;
1101 udc
->req_pending
= 0;
1102 /* FADDR is set later, when we ack host STATUS */
1105 case ((USB_TYPE_STANDARD
|USB_RECIP_DEVICE
) << 8)
1106 | USB_REQ_SET_CONFIGURATION
:
1107 tmp
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
) & AT91_UDP_CONFG
;
1109 udc
->wait_for_config_ack
= (tmp
== 0);
1111 udc
->wait_for_config_ack
= (tmp
!= 0);
1112 if (udc
->wait_for_config_ack
)
1113 VDBG("wait for config\n");
1114 /* CONFG is toggled later, if gadget driver succeeds */
1118 * Hosts may set or clear remote wakeup status, and
1119 * devices may report they're VBUS powered.
1121 case ((USB_DIR_IN
|USB_TYPE_STANDARD
|USB_RECIP_DEVICE
) << 8)
1122 | USB_REQ_GET_STATUS
:
1123 tmp
= (udc
->selfpowered
<< USB_DEVICE_SELF_POWERED
);
1124 if (at91_udp_read(udc
, AT91_UDP_GLB_STAT
) & AT91_UDP_ESR
)
1125 tmp
|= (1 << USB_DEVICE_REMOTE_WAKEUP
);
1126 PACKET("get device status\n");
1127 __raw_writeb(tmp
, dreg
);
1128 __raw_writeb(0, dreg
);
1130 /* then STATUS starts later, automatically */
1131 case ((USB_TYPE_STANDARD
|USB_RECIP_DEVICE
) << 8)
1132 | USB_REQ_SET_FEATURE
:
1133 if (w_value
!= USB_DEVICE_REMOTE_WAKEUP
)
1135 tmp
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
1136 tmp
|= AT91_UDP_ESR
;
1137 at91_udp_write(udc
, AT91_UDP_GLB_STAT
, tmp
);
1139 case ((USB_TYPE_STANDARD
|USB_RECIP_DEVICE
) << 8)
1140 | USB_REQ_CLEAR_FEATURE
:
1141 if (w_value
!= USB_DEVICE_REMOTE_WAKEUP
)
1143 tmp
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
1144 tmp
&= ~AT91_UDP_ESR
;
1145 at91_udp_write(udc
, AT91_UDP_GLB_STAT
, tmp
);
1149 * Interfaces have no feature settings; this is pretty useless.
1150 * we won't even insist the interface exists...
1152 case ((USB_DIR_IN
|USB_TYPE_STANDARD
|USB_RECIP_INTERFACE
) << 8)
1153 | USB_REQ_GET_STATUS
:
1154 PACKET("get interface status\n");
1155 __raw_writeb(0, dreg
);
1156 __raw_writeb(0, dreg
);
1158 /* then STATUS starts later, automatically */
1159 case ((USB_TYPE_STANDARD
|USB_RECIP_INTERFACE
) << 8)
1160 | USB_REQ_SET_FEATURE
:
1161 case ((USB_TYPE_STANDARD
|USB_RECIP_INTERFACE
) << 8)
1162 | USB_REQ_CLEAR_FEATURE
:
1166 * Hosts may clear bulk/intr endpoint halt after the gadget
1167 * driver sets it (not widely used); or set it (for testing)
1169 case ((USB_DIR_IN
|USB_TYPE_STANDARD
|USB_RECIP_ENDPOINT
) << 8)
1170 | USB_REQ_GET_STATUS
:
1171 tmp
= w_index
& USB_ENDPOINT_NUMBER_MASK
;
1173 if (tmp
>= NUM_ENDPOINTS
|| (tmp
&& !ep
->ep
.desc
))
1177 if ((w_index
& USB_DIR_IN
)) {
1180 } else if (ep
->is_in
)
1183 PACKET("get %s status\n", ep
->ep
.name
);
1184 if (__raw_readl(ep
->creg
) & AT91_UDP_FORCESTALL
)
1185 tmp
= (1 << USB_ENDPOINT_HALT
);
1188 __raw_writeb(tmp
, dreg
);
1189 __raw_writeb(0, dreg
);
1191 /* then STATUS starts later, automatically */
1192 case ((USB_TYPE_STANDARD
|USB_RECIP_ENDPOINT
) << 8)
1193 | USB_REQ_SET_FEATURE
:
1194 tmp
= w_index
& USB_ENDPOINT_NUMBER_MASK
;
1196 if (w_value
!= USB_ENDPOINT_HALT
|| tmp
>= NUM_ENDPOINTS
)
1198 if (!ep
->ep
.desc
|| ep
->is_iso
)
1200 if ((w_index
& USB_DIR_IN
)) {
1203 } else if (ep
->is_in
)
1206 tmp
= __raw_readl(ep
->creg
);
1208 tmp
|= CLR_FX
| AT91_UDP_FORCESTALL
;
1209 __raw_writel(tmp
, ep
->creg
);
1211 case ((USB_TYPE_STANDARD
|USB_RECIP_ENDPOINT
) << 8)
1212 | USB_REQ_CLEAR_FEATURE
:
1213 tmp
= w_index
& USB_ENDPOINT_NUMBER_MASK
;
1215 if (w_value
!= USB_ENDPOINT_HALT
|| tmp
>= NUM_ENDPOINTS
)
1219 if (!ep
->ep
.desc
|| ep
->is_iso
)
1221 if ((w_index
& USB_DIR_IN
)) {
1224 } else if (ep
->is_in
)
1227 at91_udp_write(udc
, AT91_UDP_RST_EP
, ep
->int_mask
);
1228 at91_udp_write(udc
, AT91_UDP_RST_EP
, 0);
1229 tmp
= __raw_readl(ep
->creg
);
1231 tmp
&= ~(SET_FX
| AT91_UDP_FORCESTALL
);
1232 __raw_writel(tmp
, ep
->creg
);
1233 if (!list_empty(&ep
->queue
))
1242 /* pass request up to the gadget driver */
1244 spin_unlock(&udc
->lock
);
1245 status
= udc
->driver
->setup(&udc
->gadget
, &pkt
.r
);
1246 spin_lock(&udc
->lock
);
1252 VDBG("req %02x.%02x protocol STALL; stat %d\n",
1253 pkt
.r
.bRequestType
, pkt
.r
.bRequest
, status
);
1254 csr
|= AT91_UDP_FORCESTALL
;
1255 __raw_writel(csr
, creg
);
1256 udc
->req_pending
= 0;
1261 /* immediate successful (IN) STATUS after zero length DATA */
1262 PACKET("ep0 in/status\n");
1264 csr
|= AT91_UDP_TXPKTRDY
;
1265 __raw_writel(csr
, creg
);
1266 udc
->req_pending
= 0;
1269 static void handle_ep0(struct at91_udc
*udc
)
1271 struct at91_ep
*ep0
= &udc
->ep
[0];
1272 u32 __iomem
*creg
= ep0
->creg
;
1273 u32 csr
= __raw_readl(creg
);
1274 struct at91_request
*req
;
1276 if (unlikely(csr
& AT91_UDP_STALLSENT
)) {
1278 udc
->req_pending
= 0;
1280 csr
&= ~(SET_FX
| AT91_UDP_STALLSENT
| AT91_UDP_FORCESTALL
);
1281 __raw_writel(csr
, creg
);
1282 VDBG("ep0 stalled\n");
1283 csr
= __raw_readl(creg
);
1285 if (csr
& AT91_UDP_RXSETUP
) {
1287 udc
->req_pending
= 0;
1288 handle_setup(udc
, ep0
, csr
);
1292 if (list_empty(&ep0
->queue
))
1295 req
= list_entry(ep0
->queue
.next
, struct at91_request
, queue
);
1297 /* host ACKed an IN packet that we sent */
1298 if (csr
& AT91_UDP_TXCOMP
) {
1300 csr
&= ~(SET_FX
| AT91_UDP_TXCOMP
);
1302 /* write more IN DATA? */
1303 if (req
&& ep0
->is_in
) {
1305 udc
->req_pending
= 0;
1309 * - last IN DATA packet (including GET_STATUS)
1310 * - IN/STATUS for OUT DATA
1311 * - IN/STATUS for any zero-length DATA stage
1312 * except for the IN DATA case, the host should send
1313 * an OUT status later, which we'll ack.
1316 udc
->req_pending
= 0;
1317 __raw_writel(csr
, creg
);
1320 * SET_ADDRESS takes effect only after the STATUS
1321 * (to the original address) gets acked.
1323 if (udc
->wait_for_addr_ack
) {
1326 at91_udp_write(udc
, AT91_UDP_FADDR
,
1327 AT91_UDP_FEN
| udc
->addr
);
1328 tmp
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
1329 tmp
&= ~AT91_UDP_FADDEN
;
1331 tmp
|= AT91_UDP_FADDEN
;
1332 at91_udp_write(udc
, AT91_UDP_GLB_STAT
, tmp
);
1334 udc
->wait_for_addr_ack
= 0;
1335 VDBG("address %d\n", udc
->addr
);
1340 /* OUT packet arrived ... */
1341 else if (csr
& AT91_UDP_RX_DATA_BK0
) {
1343 csr
&= ~(SET_FX
| AT91_UDP_RX_DATA_BK0
);
1345 /* OUT DATA stage */
1348 if (handle_ep(ep0
)) {
1349 /* send IN/STATUS */
1350 PACKET("ep0 in/status\n");
1351 csr
= __raw_readl(creg
);
1353 csr
|= CLR_FX
| AT91_UDP_TXPKTRDY
;
1354 __raw_writel(csr
, creg
);
1355 udc
->req_pending
= 0;
1357 } else if (udc
->req_pending
) {
1359 * AT91 hardware has a hard time with this
1360 * "deferred response" mode for control-OUT
1361 * transfers. (For control-IN it's fine.)
1363 * The normal solution leaves OUT data in the
1364 * fifo until the gadget driver is ready.
1365 * We couldn't do that here without disabling
1366 * the IRQ that tells about SETUP packets,
1367 * e.g. when the host gets impatient...
1369 * Working around it by copying into a buffer
1370 * would almost be a non-deferred response,
1371 * except that it wouldn't permit reliable
1372 * stalling of the request. Instead, demand
1373 * that gadget drivers not use this mode.
1375 DBG("no control-OUT deferred responses!\n");
1376 __raw_writel(csr
| AT91_UDP_FORCESTALL
, creg
);
1377 udc
->req_pending
= 0;
1380 /* STATUS stage for control-IN; ack. */
1382 PACKET("ep0 out/status ACK\n");
1383 __raw_writel(csr
, creg
);
1385 /* "early" status stage */
1392 static irqreturn_t
at91_udc_irq (int irq
, void *_udc
)
1394 struct at91_udc
*udc
= _udc
;
1396 int disable_clock
= 0;
1397 unsigned long flags
;
1399 spin_lock_irqsave(&udc
->lock
, flags
);
1401 if (!udc
->clocked
) {
1409 status
= at91_udp_read(udc
, AT91_UDP_ISR
)
1410 & at91_udp_read(udc
, AT91_UDP_IMR
);
1414 /* USB reset irq: not maskable */
1415 if (status
& AT91_UDP_ENDBUSRES
) {
1416 at91_udp_write(udc
, AT91_UDP_IDR
, ~MINIMUS_INTERRUPTUS
);
1417 at91_udp_write(udc
, AT91_UDP_IER
, MINIMUS_INTERRUPTUS
);
1418 /* Atmel code clears this irq twice */
1419 at91_udp_write(udc
, AT91_UDP_ICR
, AT91_UDP_ENDBUSRES
);
1420 at91_udp_write(udc
, AT91_UDP_ICR
, AT91_UDP_ENDBUSRES
);
1421 VDBG("end bus reset\n");
1426 at91_udp_write(udc
, AT91_UDP_CSR(0),
1427 AT91_UDP_EPEDS
| AT91_UDP_EPTYPE_CTRL
);
1428 udc
->gadget
.speed
= USB_SPEED_FULL
;
1430 at91_udp_write(udc
, AT91_UDP_IER
, AT91_UDP_EP(0));
1433 * NOTE: this driver keeps clocks off unless the
1434 * USB host is present. That saves power, but for
1435 * boards that don't support VBUS detection, both
1436 * clocks need to be active most of the time.
1439 /* host initiated suspend (3+ms bus idle) */
1440 } else if (status
& AT91_UDP_RXSUSP
) {
1441 at91_udp_write(udc
, AT91_UDP_IDR
, AT91_UDP_RXSUSP
);
1442 at91_udp_write(udc
, AT91_UDP_IER
, AT91_UDP_RXRSM
);
1443 at91_udp_write(udc
, AT91_UDP_ICR
, AT91_UDP_RXSUSP
);
1444 /* VDBG("bus suspend\n"); */
1450 * NOTE: when suspending a VBUS-powered device, the
1451 * gadget driver should switch into slow clock mode
1452 * and then into standby to avoid drawing more than
1453 * 500uA power (2500uA for some high-power configs).
1455 if (udc
->driver
&& udc
->driver
->suspend
) {
1456 spin_unlock(&udc
->lock
);
1457 udc
->driver
->suspend(&udc
->gadget
);
1458 spin_lock(&udc
->lock
);
1461 /* host initiated resume */
1462 } else if (status
& AT91_UDP_RXRSM
) {
1463 at91_udp_write(udc
, AT91_UDP_IDR
, AT91_UDP_RXRSM
);
1464 at91_udp_write(udc
, AT91_UDP_IER
, AT91_UDP_RXSUSP
);
1465 at91_udp_write(udc
, AT91_UDP_ICR
, AT91_UDP_RXRSM
);
1466 /* VDBG("bus resume\n"); */
1467 if (!udc
->suspended
)
1472 * NOTE: for a VBUS-powered device, the gadget driver
1473 * would normally want to switch out of slow clock
1474 * mode into normal mode.
1476 if (udc
->driver
&& udc
->driver
->resume
) {
1477 spin_unlock(&udc
->lock
);
1478 udc
->driver
->resume(&udc
->gadget
);
1479 spin_lock(&udc
->lock
);
1482 /* endpoint IRQs are cleared by handling them */
1486 struct at91_ep
*ep
= &udc
->ep
[1];
1490 for (i
= 1; i
< NUM_ENDPOINTS
; i
++) {
1502 spin_unlock_irqrestore(&udc
->lock
, flags
);
1507 /*-------------------------------------------------------------------------*/
1509 static void nop_release(struct device
*dev
)
1511 /* nothing to free */
1514 static struct at91_udc controller
= {
1516 .ops
= &at91_udc_ops
,
1517 .ep0
= &controller
.ep
[0].ep
,
1518 .name
= driver_name
,
1520 .init_name
= "gadget",
1521 .release
= nop_release
,
1527 .ops
= &at91_ep_ops
,
1536 .ops
= &at91_ep_ops
,
1546 .ops
= &at91_ep_ops
,
1555 /* could actually do bulk too */
1557 .ops
= &at91_ep_ops
,
1566 .ops
= &at91_ep_ops
,
1576 .ops
= &at91_ep_ops
,
1583 /* ep6 and ep7 are also reserved (custom silicon might use them) */
1586 static void at91_vbus_update(struct at91_udc
*udc
, unsigned value
)
1588 value
^= udc
->board
.vbus_active_low
;
1589 if (value
!= udc
->vbus
)
1590 at91_vbus_session(&udc
->gadget
, value
);
1593 static irqreturn_t
at91_vbus_irq(int irq
, void *_udc
)
1595 struct at91_udc
*udc
= _udc
;
1597 /* vbus needs at least brief debouncing */
1599 at91_vbus_update(udc
, gpio_get_value(udc
->board
.vbus_pin
));
1604 static void at91_vbus_timer_work(struct work_struct
*work
)
1606 struct at91_udc
*udc
= container_of(work
, struct at91_udc
,
1609 at91_vbus_update(udc
, gpio_get_value_cansleep(udc
->board
.vbus_pin
));
1611 if (!timer_pending(&udc
->vbus_timer
))
1612 mod_timer(&udc
->vbus_timer
, jiffies
+ VBUS_POLL_TIMEOUT
);
1615 static void at91_vbus_timer(unsigned long data
)
1617 struct at91_udc
*udc
= (struct at91_udc
*)data
;
1620 * If we are polling vbus it is likely that the gpio is on an
1621 * bus such as i2c or spi which may sleep, so schedule some work
1622 * to read the vbus gpio
1624 schedule_work(&udc
->vbus_timer_work
);
1627 static int at91_start(struct usb_gadget
*gadget
,
1628 struct usb_gadget_driver
*driver
)
1630 struct at91_udc
*udc
;
1632 udc
= container_of(gadget
, struct at91_udc
, gadget
);
1633 udc
->driver
= driver
;
1634 udc
->gadget
.dev
.of_node
= udc
->pdev
->dev
.of_node
;
1636 udc
->selfpowered
= 1;
1638 DBG("bound to %s\n", driver
->driver
.name
);
1642 static int at91_stop(struct usb_gadget
*gadget
,
1643 struct usb_gadget_driver
*driver
)
1645 struct at91_udc
*udc
;
1646 unsigned long flags
;
1648 udc
= container_of(gadget
, struct at91_udc
, gadget
);
1649 spin_lock_irqsave(&udc
->lock
, flags
);
1651 at91_udp_write(udc
, AT91_UDP_IDR
, ~0);
1652 spin_unlock_irqrestore(&udc
->lock
, flags
);
1656 DBG("unbound from %s\n", driver
->driver
.name
);
1660 /*-------------------------------------------------------------------------*/
1662 static void at91udc_shutdown(struct platform_device
*dev
)
1664 struct at91_udc
*udc
= platform_get_drvdata(dev
);
1665 unsigned long flags
;
1667 /* force disconnect on reboot */
1668 spin_lock_irqsave(&udc
->lock
, flags
);
1669 pullup(platform_get_drvdata(dev
), 0);
1670 spin_unlock_irqrestore(&udc
->lock
, flags
);
1673 static void at91udc_of_init(struct at91_udc
*udc
,
1674 struct device_node
*np
)
1676 struct at91_udc_data
*board
= &udc
->board
;
1678 enum of_gpio_flags flags
;
1680 if (of_property_read_u32(np
, "atmel,vbus-polled", &val
) == 0)
1681 board
->vbus_polled
= 1;
1683 board
->vbus_pin
= of_get_named_gpio_flags(np
, "atmel,vbus-gpio", 0,
1685 board
->vbus_active_low
= (flags
& OF_GPIO_ACTIVE_LOW
) ? 1 : 0;
1687 board
->pullup_pin
= of_get_named_gpio_flags(np
, "atmel,pullup-gpio", 0,
1690 board
->pullup_active_low
= (flags
& OF_GPIO_ACTIVE_LOW
) ? 1 : 0;
1693 static int at91udc_probe(struct platform_device
*pdev
)
1695 struct device
*dev
= &pdev
->dev
;
1696 struct at91_udc
*udc
;
1698 struct resource
*res
;
1700 if (!dev
->platform_data
&& !pdev
->dev
.of_node
) {
1701 /* small (so we copy it) but critical! */
1702 DBG("missing platform_data\n");
1706 if (pdev
->num_resources
!= 2) {
1707 DBG("invalid num_resources\n");
1710 if ((pdev
->resource
[0].flags
!= IORESOURCE_MEM
)
1711 || (pdev
->resource
[1].flags
!= IORESOURCE_IRQ
)) {
1712 DBG("invalid resource type\n");
1716 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
1720 if (!request_mem_region(res
->start
, resource_size(res
), driver_name
)) {
1721 DBG("someone's using UDC memory\n");
1725 /* init software state */
1727 udc
->gadget
.dev
.parent
= dev
;
1728 if (pdev
->dev
.of_node
)
1729 at91udc_of_init(udc
, pdev
->dev
.of_node
);
1731 memcpy(&udc
->board
, dev
->platform_data
,
1732 sizeof(struct at91_udc_data
));
1735 spin_lock_init(&udc
->lock
);
1737 /* rm9200 needs manual D+ pullup; off by default */
1738 if (cpu_is_at91rm9200()) {
1739 if (!gpio_is_valid(udc
->board
.pullup_pin
)) {
1740 DBG("no D+ pullup?\n");
1744 retval
= gpio_request(udc
->board
.pullup_pin
, "udc_pullup");
1746 DBG("D+ pullup is busy\n");
1749 gpio_direction_output(udc
->board
.pullup_pin
,
1750 udc
->board
.pullup_active_low
);
1753 /* newer chips have more FIFO memory than rm9200 */
1754 if (cpu_is_at91sam9260() || cpu_is_at91sam9g20()) {
1755 udc
->ep
[0].maxpacket
= 64;
1756 udc
->ep
[3].maxpacket
= 64;
1757 udc
->ep
[4].maxpacket
= 512;
1758 udc
->ep
[5].maxpacket
= 512;
1759 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
1760 udc
->ep
[3].maxpacket
= 64;
1761 } else if (cpu_is_at91sam9263()) {
1762 udc
->ep
[0].maxpacket
= 64;
1763 udc
->ep
[3].maxpacket
= 64;
1766 udc
->udp_baseaddr
= ioremap(res
->start
, resource_size(res
));
1767 if (!udc
->udp_baseaddr
) {
1774 /* get interface and function clocks */
1775 udc
->iclk
= clk_get(dev
, "udc_clk");
1776 udc
->fclk
= clk_get(dev
, "udpck");
1777 if (IS_ERR(udc
->iclk
) || IS_ERR(udc
->fclk
)) {
1778 DBG("clocks missing\n");
1780 /* NOTE: we "know" here that refcounts on these are NOPs */
1784 /* don't do anything until we have both gadget driver and VBUS */
1785 clk_enable(udc
->iclk
);
1786 at91_udp_write(udc
, AT91_UDP_TXVC
, AT91_UDP_TXVC_TXVDIS
);
1787 at91_udp_write(udc
, AT91_UDP_IDR
, 0xffffffff);
1788 /* Clear all pending interrupts - UDP may be used by bootloader. */
1789 at91_udp_write(udc
, AT91_UDP_ICR
, 0xffffffff);
1790 clk_disable(udc
->iclk
);
1792 /* request UDC and maybe VBUS irqs */
1793 udc
->udp_irq
= platform_get_irq(pdev
, 0);
1794 retval
= request_irq(udc
->udp_irq
, at91_udc_irq
,
1795 0, driver_name
, udc
);
1797 DBG("request irq %d failed\n", udc
->udp_irq
);
1800 if (gpio_is_valid(udc
->board
.vbus_pin
)) {
1801 retval
= gpio_request(udc
->board
.vbus_pin
, "udc_vbus");
1803 DBG("request vbus pin failed\n");
1806 gpio_direction_input(udc
->board
.vbus_pin
);
1809 * Get the initial state of VBUS - we cannot expect
1810 * a pending interrupt.
1812 udc
->vbus
= gpio_get_value_cansleep(udc
->board
.vbus_pin
) ^
1813 udc
->board
.vbus_active_low
;
1815 if (udc
->board
.vbus_polled
) {
1816 INIT_WORK(&udc
->vbus_timer_work
, at91_vbus_timer_work
);
1817 setup_timer(&udc
->vbus_timer
, at91_vbus_timer
,
1818 (unsigned long)udc
);
1819 mod_timer(&udc
->vbus_timer
,
1820 jiffies
+ VBUS_POLL_TIMEOUT
);
1822 if (request_irq(gpio_to_irq(udc
->board
.vbus_pin
),
1823 at91_vbus_irq
, 0, driver_name
, udc
)) {
1824 DBG("request vbus irq %d failed\n",
1825 udc
->board
.vbus_pin
);
1831 DBG("no VBUS detection, assuming always-on\n");
1834 retval
= usb_add_gadget_udc(dev
, &udc
->gadget
);
1837 dev_set_drvdata(dev
, udc
);
1838 device_init_wakeup(dev
, 1);
1839 create_debug_file(udc
);
1841 INFO("%s version %s\n", driver_name
, DRIVER_VERSION
);
1844 if (gpio_is_valid(udc
->board
.vbus_pin
) && !udc
->board
.vbus_polled
)
1845 free_irq(gpio_to_irq(udc
->board
.vbus_pin
), udc
);
1847 if (gpio_is_valid(udc
->board
.vbus_pin
))
1848 gpio_free(udc
->board
.vbus_pin
);
1850 free_irq(udc
->udp_irq
, udc
);
1852 iounmap(udc
->udp_baseaddr
);
1854 if (cpu_is_at91rm9200())
1855 gpio_free(udc
->board
.pullup_pin
);
1857 release_mem_region(res
->start
, resource_size(res
));
1858 DBG("%s probe failed, %d\n", driver_name
, retval
);
1862 static int __exit
at91udc_remove(struct platform_device
*pdev
)
1864 struct at91_udc
*udc
= platform_get_drvdata(pdev
);
1865 struct resource
*res
;
1866 unsigned long flags
;
1870 usb_del_gadget_udc(&udc
->gadget
);
1874 spin_lock_irqsave(&udc
->lock
, flags
);
1876 spin_unlock_irqrestore(&udc
->lock
, flags
);
1878 device_init_wakeup(&pdev
->dev
, 0);
1879 remove_debug_file(udc
);
1880 if (gpio_is_valid(udc
->board
.vbus_pin
)) {
1881 free_irq(gpio_to_irq(udc
->board
.vbus_pin
), udc
);
1882 gpio_free(udc
->board
.vbus_pin
);
1884 free_irq(udc
->udp_irq
, udc
);
1885 iounmap(udc
->udp_baseaddr
);
1887 if (cpu_is_at91rm9200())
1888 gpio_free(udc
->board
.pullup_pin
);
1890 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
1891 release_mem_region(res
->start
, resource_size(res
));
1900 static int at91udc_suspend(struct platform_device
*pdev
, pm_message_t mesg
)
1902 struct at91_udc
*udc
= platform_get_drvdata(pdev
);
1903 int wake
= udc
->driver
&& device_may_wakeup(&pdev
->dev
);
1904 unsigned long flags
;
1906 /* Unless we can act normally to the host (letting it wake us up
1907 * whenever it has work for us) force disconnect. Wakeup requires
1908 * PLLB for USB events (signaling for reset, wakeup, or incoming
1909 * tokens) and VBUS irqs (on systems which support them).
1911 if ((!udc
->suspended
&& udc
->addr
)
1913 || at91_suspend_entering_slow_clock()) {
1914 spin_lock_irqsave(&udc
->lock
, flags
);
1917 spin_unlock_irqrestore(&udc
->lock
, flags
);
1919 enable_irq_wake(udc
->udp_irq
);
1921 udc
->active_suspend
= wake
;
1922 if (gpio_is_valid(udc
->board
.vbus_pin
) && !udc
->board
.vbus_polled
&& wake
)
1923 enable_irq_wake(udc
->board
.vbus_pin
);
1927 static int at91udc_resume(struct platform_device
*pdev
)
1929 struct at91_udc
*udc
= platform_get_drvdata(pdev
);
1930 unsigned long flags
;
1932 if (gpio_is_valid(udc
->board
.vbus_pin
) && !udc
->board
.vbus_polled
&&
1933 udc
->active_suspend
)
1934 disable_irq_wake(udc
->board
.vbus_pin
);
1936 /* maybe reconnect to host; if so, clocks on */
1937 if (udc
->active_suspend
)
1938 disable_irq_wake(udc
->udp_irq
);
1940 spin_lock_irqsave(&udc
->lock
, flags
);
1942 spin_unlock_irqrestore(&udc
->lock
, flags
);
1947 #define at91udc_suspend NULL
1948 #define at91udc_resume NULL
1951 #if defined(CONFIG_OF)
1952 static const struct of_device_id at91_udc_dt_ids
[] = {
1953 { .compatible
= "atmel,at91rm9200-udc" },
1957 MODULE_DEVICE_TABLE(of
, at91_udc_dt_ids
);
1960 static struct platform_driver at91_udc_driver
= {
1961 .remove
= __exit_p(at91udc_remove
),
1962 .shutdown
= at91udc_shutdown
,
1963 .suspend
= at91udc_suspend
,
1964 .resume
= at91udc_resume
,
1966 .name
= (char *) driver_name
,
1967 .owner
= THIS_MODULE
,
1968 .of_match_table
= of_match_ptr(at91_udc_dt_ids
),
1972 module_platform_driver_probe(at91_udc_driver
, at91udc_probe
);
1974 MODULE_DESCRIPTION("AT91 udc driver");
1975 MODULE_AUTHOR("Thomas Rathbone, David Brownell");
1976 MODULE_LICENSE("GPL");
1977 MODULE_ALIAS("platform:at91_udc");