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.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/platform_device.h>
30 #include <linux/delay.h>
31 #include <linux/ioport.h>
32 #include <linux/slab.h>
33 #include <linux/errno.h>
34 #include <linux/init.h>
35 #include <linux/list.h>
36 #include <linux/interrupt.h>
37 #include <linux/proc_fs.h>
38 #include <linux/clk.h>
39 #include <linux/usb/ch9.h>
40 #include <linux/usb/gadget.h>
42 #include <asm/byteorder.h>
43 #include <mach/hardware.h>
46 #include <asm/system.h>
49 #include <mach/board.h>
51 #include <mach/at91sam9261_matrix.h>
57 * This controller is simple and PIO-only. It's used in many AT91-series
58 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
59 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
61 * This driver expects the board has been wired with two GPIOs suppporting
62 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the
63 * testing hasn't covered such cases.)
65 * The pullup is most important (so it's integrated on sam926x parts). It
66 * provides software control over whether the host enumerates the device.
68 * The VBUS sensing helps during enumeration, and allows both USB clocks
69 * (and the transceiver) to stay gated off until they're necessary, saving
70 * power. During USB suspend, the 48 MHz clock is gated off in hardware;
71 * it may also be gated off by software during some Linux sleep states.
74 #define DRIVER_VERSION "3 May 2006"
76 static const char driver_name
[] = "at91_udc";
77 static const char ep0name
[] = "ep0";
80 #define at91_udp_read(dev, reg) \
81 __raw_readl((dev)->udp_baseaddr + (reg))
82 #define at91_udp_write(dev, reg, val) \
83 __raw_writel((val), (dev)->udp_baseaddr + (reg))
85 /*-------------------------------------------------------------------------*/
87 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
89 #include <linux/seq_file.h>
91 static const char debug_filename
[] = "driver/udc";
93 #define FOURBITS "%s%s%s%s"
94 #define EIGHTBITS FOURBITS FOURBITS
96 static void proc_ep_show(struct seq_file
*s
, struct at91_ep
*ep
)
98 static char *types
[] = {
99 "control", "out-iso", "out-bulk", "out-int",
100 "BOGUS", "in-iso", "in-bulk", "in-int"};
103 struct at91_request
*req
;
106 local_irq_save(flags
);
108 csr
= __raw_readl(ep
->creg
);
110 /* NOTE: not collecting per-endpoint irq statistics... */
113 seq_printf(s
, "%s, maxpacket %d %s%s %s%s\n",
114 ep
->ep
.name
, ep
->ep
.maxpacket
,
115 ep
->is_in
? "in" : "out",
116 ep
->is_iso
? " iso" : "",
118 ? (ep
->fifo_bank
? "pong" : "ping")
120 ep
->stopped
? " stopped" : "");
121 seq_printf(s
, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS
"\n",
123 (csr
& 0x07ff0000) >> 16,
124 (csr
& (1 << 15)) ? "enabled" : "disabled",
125 (csr
& (1 << 11)) ? "DATA1" : "DATA0",
126 types
[(csr
& 0x700) >> 8],
128 /* iff type is control then print current direction */
130 ? ((csr
& (1 << 7)) ? " IN" : " OUT")
132 (csr
& (1 << 6)) ? " rxdatabk1" : "",
133 (csr
& (1 << 5)) ? " forcestall" : "",
134 (csr
& (1 << 4)) ? " txpktrdy" : "",
136 (csr
& (1 << 3)) ? " stallsent" : "",
137 (csr
& (1 << 2)) ? " rxsetup" : "",
138 (csr
& (1 << 1)) ? " rxdatabk0" : "",
139 (csr
& (1 << 0)) ? " txcomp" : "");
140 if (list_empty (&ep
->queue
))
141 seq_printf(s
, "\t(queue empty)\n");
143 else list_for_each_entry (req
, &ep
->queue
, queue
) {
144 unsigned length
= req
->req
.actual
;
146 seq_printf(s
, "\treq %p len %d/%d buf %p\n",
148 req
->req
.length
, req
->req
.buf
);
150 local_irq_restore(flags
);
153 static void proc_irq_show(struct seq_file
*s
, const char *label
, u32 mask
)
157 seq_printf(s
, "%s %04x:%s%s" FOURBITS
, label
, mask
,
158 (mask
& (1 << 13)) ? " wakeup" : "",
159 (mask
& (1 << 12)) ? " endbusres" : "",
161 (mask
& (1 << 11)) ? " sofint" : "",
162 (mask
& (1 << 10)) ? " extrsm" : "",
163 (mask
& (1 << 9)) ? " rxrsm" : "",
164 (mask
& (1 << 8)) ? " rxsusp" : "");
165 for (i
= 0; i
< 8; i
++) {
167 seq_printf(s
, " ep%d", i
);
172 static int proc_udc_show(struct seq_file
*s
, void *unused
)
174 struct at91_udc
*udc
= s
->private;
178 seq_printf(s
, "%s: version %s\n", driver_name
, DRIVER_VERSION
);
180 seq_printf(s
, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
181 udc
->vbus
? "present" : "off",
183 ? (udc
->vbus
? "active" : "enabled")
185 udc
->selfpowered
? "self" : "VBUS",
186 udc
->suspended
? ", suspended" : "",
187 udc
->driver
? udc
->driver
->driver
.name
: "(none)");
189 /* don't access registers when interface isn't clocked */
191 seq_printf(s
, "(not clocked)\n");
195 tmp
= at91_udp_read(udc
, AT91_UDP_FRM_NUM
);
196 seq_printf(s
, "frame %05x:%s%s frame=%d\n", tmp
,
197 (tmp
& AT91_UDP_FRM_OK
) ? " ok" : "",
198 (tmp
& AT91_UDP_FRM_ERR
) ? " err" : "",
199 (tmp
& AT91_UDP_NUM
));
201 tmp
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
202 seq_printf(s
, "glbstate %02x:%s" FOURBITS
"\n", tmp
,
203 (tmp
& AT91_UDP_RMWUPE
) ? " rmwupe" : "",
204 (tmp
& AT91_UDP_RSMINPR
) ? " rsminpr" : "",
205 (tmp
& AT91_UDP_ESR
) ? " esr" : "",
206 (tmp
& AT91_UDP_CONFG
) ? " confg" : "",
207 (tmp
& AT91_UDP_FADDEN
) ? " fadden" : "");
209 tmp
= at91_udp_read(udc
, AT91_UDP_FADDR
);
210 seq_printf(s
, "faddr %03x:%s fadd=%d\n", tmp
,
211 (tmp
& AT91_UDP_FEN
) ? " fen" : "",
212 (tmp
& AT91_UDP_FADD
));
214 proc_irq_show(s
, "imr ", at91_udp_read(udc
, AT91_UDP_IMR
));
215 proc_irq_show(s
, "isr ", at91_udp_read(udc
, AT91_UDP_ISR
));
217 if (udc
->enabled
&& udc
->vbus
) {
218 proc_ep_show(s
, &udc
->ep
[0]);
219 list_for_each_entry (ep
, &udc
->gadget
.ep_list
, ep
.ep_list
) {
227 static int proc_udc_open(struct inode
*inode
, struct file
*file
)
229 return single_open(file
, proc_udc_show
, PDE(inode
)->data
);
232 static const struct file_operations proc_ops
= {
233 .owner
= THIS_MODULE
,
234 .open
= proc_udc_open
,
237 .release
= single_release
,
240 static void create_debug_file(struct at91_udc
*udc
)
242 udc
->pde
= proc_create_data(debug_filename
, 0, NULL
, &proc_ops
, udc
);
245 static void remove_debug_file(struct at91_udc
*udc
)
248 remove_proc_entry(debug_filename
, NULL
);
253 static inline void create_debug_file(struct at91_udc
*udc
) {}
254 static inline void remove_debug_file(struct at91_udc
*udc
) {}
259 /*-------------------------------------------------------------------------*/
261 static void done(struct at91_ep
*ep
, struct at91_request
*req
, int status
)
263 unsigned stopped
= ep
->stopped
;
264 struct at91_udc
*udc
= ep
->udc
;
266 list_del_init(&req
->queue
);
267 if (req
->req
.status
== -EINPROGRESS
)
268 req
->req
.status
= status
;
270 status
= req
->req
.status
;
271 if (status
&& status
!= -ESHUTDOWN
)
272 VDBG("%s done %p, status %d\n", ep
->ep
.name
, req
, status
);
275 req
->req
.complete(&ep
->ep
, &req
->req
);
276 ep
->stopped
= stopped
;
278 /* ep0 is always ready; other endpoints need a non-empty queue */
279 if (list_empty(&ep
->queue
) && ep
->int_mask
!= (1 << 0))
280 at91_udp_write(udc
, AT91_UDP_IDR
, ep
->int_mask
);
283 /*-------------------------------------------------------------------------*/
285 /* bits indicating OUT fifo has data ready */
286 #define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
289 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
290 * back most of the value you just read (because of side effects, including
291 * bits that may change after reading and before writing).
293 * Except when changing a specific bit, always write values which:
294 * - clear SET_FX bits (setting them could change something)
295 * - set CLR_FX bits (clearing them could change something)
297 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
298 * that shouldn't normally be changed.
300 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
301 * implying a need to wait for one write to complete (test relevant bits)
302 * before starting the next write. This shouldn't be an issue given how
303 * infrequently we write, except maybe for write-then-read idioms.
305 #define SET_FX (AT91_UDP_TXPKTRDY)
306 #define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \
307 | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
309 /* pull OUT packet data from the endpoint's fifo */
310 static int read_fifo (struct at91_ep
*ep
, struct at91_request
*req
)
312 u32 __iomem
*creg
= ep
->creg
;
313 u8 __iomem
*dreg
= ep
->creg
+ (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
316 unsigned int count
, bufferspace
, is_done
;
318 buf
= req
->req
.buf
+ req
->req
.actual
;
319 bufferspace
= req
->req
.length
- req
->req
.actual
;
322 * there might be nothing to read if ep_queue() calls us,
323 * or if we already emptied both pingpong buffers
326 csr
= __raw_readl(creg
);
327 if ((csr
& RX_DATA_READY
) == 0)
330 count
= (csr
& AT91_UDP_RXBYTECNT
) >> 16;
331 if (count
> ep
->ep
.maxpacket
)
332 count
= ep
->ep
.maxpacket
;
333 if (count
> bufferspace
) {
334 DBG("%s buffer overflow\n", ep
->ep
.name
);
335 req
->req
.status
= -EOVERFLOW
;
338 __raw_readsb(dreg
, buf
, count
);
340 /* release and swap pingpong mem bank */
342 if (ep
->is_pingpong
) {
343 if (ep
->fifo_bank
== 0) {
344 csr
&= ~(SET_FX
| AT91_UDP_RX_DATA_BK0
);
347 csr
&= ~(SET_FX
| AT91_UDP_RX_DATA_BK1
);
351 csr
&= ~(SET_FX
| AT91_UDP_RX_DATA_BK0
);
352 __raw_writel(csr
, creg
);
354 req
->req
.actual
+= count
;
355 is_done
= (count
< ep
->ep
.maxpacket
);
356 if (count
== bufferspace
)
359 PACKET("%s %p out/%d%s\n", ep
->ep
.name
, &req
->req
, count
,
360 is_done
? " (done)" : "");
363 * avoid extra trips through IRQ logic for packets already in
364 * the fifo ... maybe preventing an extra (expensive) OUT-NAK
368 else if (ep
->is_pingpong
) {
369 bufferspace
-= count
;
377 /* load fifo for an IN packet */
378 static int write_fifo(struct at91_ep
*ep
, struct at91_request
*req
)
380 u32 __iomem
*creg
= ep
->creg
;
381 u32 csr
= __raw_readl(creg
);
382 u8 __iomem
*dreg
= ep
->creg
+ (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
383 unsigned total
, count
, is_last
;
387 * TODO: allow for writing two packets to the fifo ... that'll
388 * reduce the amount of IN-NAKing, but probably won't affect
389 * throughput much. (Unlike preventing OUT-NAKing!)
393 * If ep_queue() calls us, the queue is empty and possibly in
394 * odd states like TXCOMP not yet cleared (we do it, saving at
395 * least one IRQ) or the fifo not yet being free. Those aren't
396 * issues normally (IRQ handler fast path).
398 if (unlikely(csr
& (AT91_UDP_TXCOMP
| AT91_UDP_TXPKTRDY
))) {
399 if (csr
& AT91_UDP_TXCOMP
) {
401 csr
&= ~(SET_FX
| AT91_UDP_TXCOMP
);
402 __raw_writel(csr
, creg
);
403 csr
= __raw_readl(creg
);
405 if (csr
& AT91_UDP_TXPKTRDY
)
409 buf
= req
->req
.buf
+ req
->req
.actual
;
411 total
= req
->req
.length
- req
->req
.actual
;
412 if (ep
->ep
.maxpacket
< total
) {
413 count
= ep
->ep
.maxpacket
;
417 is_last
= (count
< ep
->ep
.maxpacket
) || !req
->req
.zero
;
421 * Write the packet, maybe it's a ZLP.
423 * NOTE: incrementing req->actual before we receive the ACK means
424 * gadget driver IN bytecounts can be wrong in fault cases. That's
425 * fixable with PIO drivers like this one (save "count" here, and
426 * do the increment later on TX irq), but not for most DMA hardware.
428 * So all gadget drivers must accept that potential error. Some
429 * hardware supports precise fifo status reporting, letting them
430 * recover when the actual bytecount matters (e.g. for USB Test
431 * and Measurement Class devices).
433 __raw_writesb(dreg
, buf
, count
);
435 csr
|= CLR_FX
| AT91_UDP_TXPKTRDY
;
436 __raw_writel(csr
, creg
);
437 req
->req
.actual
+= count
;
439 PACKET("%s %p in/%d%s\n", ep
->ep
.name
, &req
->req
, count
,
440 is_last
? " (done)" : "");
446 static void nuke(struct at91_ep
*ep
, int status
)
448 struct at91_request
*req
;
450 // terminer chaque requete dans la queue
452 if (list_empty(&ep
->queue
))
455 VDBG("%s %s\n", __func__
, ep
->ep
.name
);
456 while (!list_empty(&ep
->queue
)) {
457 req
= list_entry(ep
->queue
.next
, struct at91_request
, queue
);
458 done(ep
, req
, status
);
462 /*-------------------------------------------------------------------------*/
464 static int at91_ep_enable(struct usb_ep
*_ep
,
465 const struct usb_endpoint_descriptor
*desc
)
467 struct at91_ep
*ep
= container_of(_ep
, struct at91_ep
, ep
);
468 struct at91_udc
*dev
= ep
->udc
;
475 || _ep
->name
== ep0name
476 || desc
->bDescriptorType
!= USB_DT_ENDPOINT
477 || (maxpacket
= le16_to_cpu(desc
->wMaxPacketSize
)) == 0
478 || maxpacket
> ep
->maxpacket
) {
479 DBG("bad ep or descriptor\n");
483 if (!dev
->driver
|| dev
->gadget
.speed
== USB_SPEED_UNKNOWN
) {
484 DBG("bogus device state\n");
488 tmp
= usb_endpoint_type(desc
);
490 case USB_ENDPOINT_XFER_CONTROL
:
491 DBG("only one control endpoint\n");
493 case USB_ENDPOINT_XFER_INT
:
497 case USB_ENDPOINT_XFER_BULK
:
506 DBG("bogus maxpacket %d\n", maxpacket
);
508 case USB_ENDPOINT_XFER_ISOC
:
509 if (!ep
->is_pingpong
) {
510 DBG("iso requires double buffering\n");
517 local_irq_save(flags
);
519 /* initialize endpoint to match this descriptor */
520 ep
->is_in
= usb_endpoint_dir_in(desc
);
521 ep
->is_iso
= (tmp
== USB_ENDPOINT_XFER_ISOC
);
526 tmp
|= AT91_UDP_EPEDS
;
527 __raw_writel(tmp
, ep
->creg
);
530 ep
->ep
.maxpacket
= maxpacket
;
533 * reset/init endpoint fifo. NOTE: leaves fifo_bank alone,
534 * since endpoint resets don't reset hw pingpong state.
536 at91_udp_write(dev
, AT91_UDP_RST_EP
, ep
->int_mask
);
537 at91_udp_write(dev
, AT91_UDP_RST_EP
, 0);
539 local_irq_restore(flags
);
543 static int at91_ep_disable (struct usb_ep
* _ep
)
545 struct at91_ep
*ep
= container_of(_ep
, struct at91_ep
, ep
);
546 struct at91_udc
*udc
= ep
->udc
;
549 if (ep
== &ep
->udc
->ep
[0])
552 local_irq_save(flags
);
554 nuke(ep
, -ESHUTDOWN
);
556 /* restore the endpoint's pristine config */
558 ep
->ep
.maxpacket
= ep
->maxpacket
;
560 /* reset fifos and endpoint */
561 if (ep
->udc
->clocked
) {
562 at91_udp_write(udc
, AT91_UDP_RST_EP
, ep
->int_mask
);
563 at91_udp_write(udc
, AT91_UDP_RST_EP
, 0);
564 __raw_writel(0, ep
->creg
);
567 local_irq_restore(flags
);
572 * this is a PIO-only driver, so there's nothing
573 * interesting for request or buffer allocation.
576 static struct usb_request
*
577 at91_ep_alloc_request(struct usb_ep
*_ep
, gfp_t gfp_flags
)
579 struct at91_request
*req
;
581 req
= kzalloc(sizeof (struct at91_request
), gfp_flags
);
585 INIT_LIST_HEAD(&req
->queue
);
589 static void at91_ep_free_request(struct usb_ep
*_ep
, struct usb_request
*_req
)
591 struct at91_request
*req
;
593 req
= container_of(_req
, struct at91_request
, req
);
594 BUG_ON(!list_empty(&req
->queue
));
598 static int at91_ep_queue(struct usb_ep
*_ep
,
599 struct usb_request
*_req
, gfp_t gfp_flags
)
601 struct at91_request
*req
;
603 struct at91_udc
*dev
;
607 req
= container_of(_req
, struct at91_request
, req
);
608 ep
= container_of(_ep
, struct at91_ep
, ep
);
610 if (!_req
|| !_req
->complete
611 || !_req
->buf
|| !list_empty(&req
->queue
)) {
612 DBG("invalid request\n");
616 if (!_ep
|| (!ep
->desc
&& ep
->ep
.name
!= ep0name
)) {
623 if (!dev
|| !dev
->driver
|| dev
->gadget
.speed
== USB_SPEED_UNKNOWN
) {
624 DBG("invalid device\n");
628 _req
->status
= -EINPROGRESS
;
631 local_irq_save(flags
);
633 /* try to kickstart any empty and idle queue */
634 if (list_empty(&ep
->queue
) && !ep
->stopped
) {
638 * If this control request has a non-empty DATA stage, this
639 * will start that stage. It works just like a non-control
640 * request (until the status stage starts, maybe early).
642 * If the data stage is empty, then this starts a successful
643 * IN/STATUS stage. (Unsuccessful ones use set_halt.)
645 is_ep0
= (ep
->ep
.name
== ep0name
);
649 if (!dev
->req_pending
) {
655 * defer changing CONFG until after the gadget driver
656 * reconfigures the endpoints.
658 if (dev
->wait_for_config_ack
) {
659 tmp
= at91_udp_read(dev
, AT91_UDP_GLB_STAT
);
660 tmp
^= AT91_UDP_CONFG
;
661 VDBG("toggle config\n");
662 at91_udp_write(dev
, AT91_UDP_GLB_STAT
, tmp
);
664 if (req
->req
.length
== 0) {
666 PACKET("ep0 in/status\n");
668 tmp
= __raw_readl(ep
->creg
);
670 tmp
|= CLR_FX
| AT91_UDP_TXPKTRDY
;
671 __raw_writel(tmp
, ep
->creg
);
672 dev
->req_pending
= 0;
678 status
= write_fifo(ep
, req
);
680 status
= read_fifo(ep
, req
);
682 /* IN/STATUS stage is otherwise triggered by irq */
683 if (status
&& is_ep0
)
689 if (req
&& !status
) {
690 list_add_tail (&req
->queue
, &ep
->queue
);
691 at91_udp_write(dev
, AT91_UDP_IER
, ep
->int_mask
);
694 local_irq_restore(flags
);
695 return (status
< 0) ? status
: 0;
698 static int at91_ep_dequeue(struct usb_ep
*_ep
, struct usb_request
*_req
)
701 struct at91_request
*req
;
703 ep
= container_of(_ep
, struct at91_ep
, ep
);
704 if (!_ep
|| ep
->ep
.name
== ep0name
)
707 /* make sure it's actually queued on this endpoint */
708 list_for_each_entry (req
, &ep
->queue
, queue
) {
709 if (&req
->req
== _req
)
712 if (&req
->req
!= _req
)
715 done(ep
, req
, -ECONNRESET
);
719 static int at91_ep_set_halt(struct usb_ep
*_ep
, int value
)
721 struct at91_ep
*ep
= container_of(_ep
, struct at91_ep
, ep
);
722 struct at91_udc
*udc
= ep
->udc
;
728 if (!_ep
|| ep
->is_iso
|| !ep
->udc
->clocked
)
732 local_irq_save(flags
);
734 csr
= __raw_readl(creg
);
737 * fail with still-busy IN endpoints, ensuring correct sequencing
738 * of data tx then stall. note that the fifo rx bytecount isn't
739 * completely accurate as a tx bytecount.
741 if (ep
->is_in
&& (!list_empty(&ep
->queue
) || (csr
>> 16) != 0))
747 csr
|= AT91_UDP_FORCESTALL
;
748 VDBG("halt %s\n", ep
->ep
.name
);
750 at91_udp_write(udc
, AT91_UDP_RST_EP
, ep
->int_mask
);
751 at91_udp_write(udc
, AT91_UDP_RST_EP
, 0);
752 csr
&= ~AT91_UDP_FORCESTALL
;
754 __raw_writel(csr
, creg
);
757 local_irq_restore(flags
);
761 static const struct usb_ep_ops at91_ep_ops
= {
762 .enable
= at91_ep_enable
,
763 .disable
= at91_ep_disable
,
764 .alloc_request
= at91_ep_alloc_request
,
765 .free_request
= at91_ep_free_request
,
766 .queue
= at91_ep_queue
,
767 .dequeue
= at91_ep_dequeue
,
768 .set_halt
= at91_ep_set_halt
,
769 // there's only imprecise fifo status reporting
772 /*-------------------------------------------------------------------------*/
774 static int at91_get_frame(struct usb_gadget
*gadget
)
776 struct at91_udc
*udc
= to_udc(gadget
);
778 if (!to_udc(gadget
)->clocked
)
780 return at91_udp_read(udc
, AT91_UDP_FRM_NUM
) & AT91_UDP_NUM
;
783 static int at91_wakeup(struct usb_gadget
*gadget
)
785 struct at91_udc
*udc
= to_udc(gadget
);
787 int status
= -EINVAL
;
790 DBG("%s\n", __func__
);
791 local_irq_save(flags
);
793 if (!udc
->clocked
|| !udc
->suspended
)
796 /* NOTE: some "early versions" handle ESR differently ... */
798 glbstate
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
799 if (!(glbstate
& AT91_UDP_ESR
))
801 glbstate
|= AT91_UDP_ESR
;
802 at91_udp_write(udc
, AT91_UDP_GLB_STAT
, glbstate
);
805 local_irq_restore(flags
);
809 /* reinit == restore inital software state */
810 static void udc_reinit(struct at91_udc
*udc
)
814 INIT_LIST_HEAD(&udc
->gadget
.ep_list
);
815 INIT_LIST_HEAD(&udc
->gadget
.ep0
->ep_list
);
817 for (i
= 0; i
< NUM_ENDPOINTS
; i
++) {
818 struct at91_ep
*ep
= &udc
->ep
[i
];
821 list_add_tail(&ep
->ep
.ep_list
, &udc
->gadget
.ep_list
);
825 ep
->ep
.maxpacket
= ep
->maxpacket
;
826 ep
->creg
= (void __iomem
*) udc
->udp_baseaddr
+ AT91_UDP_CSR(i
);
827 // initialiser une queue par endpoint
828 INIT_LIST_HEAD(&ep
->queue
);
832 static void stop_activity(struct at91_udc
*udc
)
834 struct usb_gadget_driver
*driver
= udc
->driver
;
837 if (udc
->gadget
.speed
== USB_SPEED_UNKNOWN
)
839 udc
->gadget
.speed
= USB_SPEED_UNKNOWN
;
842 for (i
= 0; i
< NUM_ENDPOINTS
; i
++) {
843 struct at91_ep
*ep
= &udc
->ep
[i
];
845 nuke(ep
, -ESHUTDOWN
);
848 driver
->disconnect(&udc
->gadget
);
853 static void clk_on(struct at91_udc
*udc
)
858 clk_enable(udc
->iclk
);
859 clk_enable(udc
->fclk
);
862 static void clk_off(struct at91_udc
*udc
)
867 udc
->gadget
.speed
= USB_SPEED_UNKNOWN
;
868 clk_disable(udc
->fclk
);
869 clk_disable(udc
->iclk
);
873 * activate/deactivate link with host; minimize power usage for
874 * inactive links by cutting clocks and transceiver power.
876 static void pullup(struct at91_udc
*udc
, int is_on
)
878 int active
= !udc
->board
.pullup_active_low
;
880 if (!udc
->enabled
|| !udc
->vbus
)
882 DBG("%sactive\n", is_on
? "" : "in");
886 at91_udp_write(udc
, AT91_UDP_ICR
, AT91_UDP_RXRSM
);
887 at91_udp_write(udc
, AT91_UDP_TXVC
, 0);
888 if (cpu_is_at91rm9200())
889 gpio_set_value(udc
->board
.pullup_pin
, active
);
890 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
891 u32 txvc
= at91_udp_read(udc
, AT91_UDP_TXVC
);
893 txvc
|= AT91_UDP_TXVC_PUON
;
894 at91_udp_write(udc
, AT91_UDP_TXVC
, txvc
);
895 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
898 usbpucr
= at91_sys_read(AT91_MATRIX_USBPUCR
);
899 usbpucr
|= AT91_MATRIX_USBPUCR_PUON
;
900 at91_sys_write(AT91_MATRIX_USBPUCR
, usbpucr
);
904 at91_udp_write(udc
, AT91_UDP_IDR
, AT91_UDP_RXRSM
);
905 at91_udp_write(udc
, AT91_UDP_TXVC
, AT91_UDP_TXVC_TXVDIS
);
906 if (cpu_is_at91rm9200())
907 gpio_set_value(udc
->board
.pullup_pin
, !active
);
908 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
909 u32 txvc
= at91_udp_read(udc
, AT91_UDP_TXVC
);
911 txvc
&= ~AT91_UDP_TXVC_PUON
;
912 at91_udp_write(udc
, AT91_UDP_TXVC
, txvc
);
913 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
916 usbpucr
= at91_sys_read(AT91_MATRIX_USBPUCR
);
917 usbpucr
&= ~AT91_MATRIX_USBPUCR_PUON
;
918 at91_sys_write(AT91_MATRIX_USBPUCR
, usbpucr
);
924 /* vbus is here! turn everything on that's ready */
925 static int at91_vbus_session(struct usb_gadget
*gadget
, int is_active
)
927 struct at91_udc
*udc
= to_udc(gadget
);
930 // VDBG("vbus %s\n", is_active ? "on" : "off");
931 local_irq_save(flags
);
932 udc
->vbus
= (is_active
!= 0);
934 pullup(udc
, is_active
);
937 local_irq_restore(flags
);
941 static int at91_pullup(struct usb_gadget
*gadget
, int is_on
)
943 struct at91_udc
*udc
= to_udc(gadget
);
946 local_irq_save(flags
);
947 udc
->enabled
= is_on
= !!is_on
;
949 local_irq_restore(flags
);
953 static int at91_set_selfpowered(struct usb_gadget
*gadget
, int is_on
)
955 struct at91_udc
*udc
= to_udc(gadget
);
958 local_irq_save(flags
);
959 udc
->selfpowered
= (is_on
!= 0);
960 local_irq_restore(flags
);
964 static const struct usb_gadget_ops at91_udc_ops
= {
965 .get_frame
= at91_get_frame
,
966 .wakeup
= at91_wakeup
,
967 .set_selfpowered
= at91_set_selfpowered
,
968 .vbus_session
= at91_vbus_session
,
969 .pullup
= at91_pullup
,
972 * VBUS-powered devices may also also want to support bigger
973 * power budgets after an appropriate SET_CONFIGURATION.
975 // .vbus_power = at91_vbus_power,
978 /*-------------------------------------------------------------------------*/
980 static int handle_ep(struct at91_ep
*ep
)
982 struct at91_request
*req
;
983 u32 __iomem
*creg
= ep
->creg
;
984 u32 csr
= __raw_readl(creg
);
986 if (!list_empty(&ep
->queue
))
987 req
= list_entry(ep
->queue
.next
,
988 struct at91_request
, queue
);
993 if (csr
& (AT91_UDP_STALLSENT
| AT91_UDP_TXCOMP
)) {
995 csr
&= ~(SET_FX
| AT91_UDP_STALLSENT
| AT91_UDP_TXCOMP
);
996 __raw_writel(csr
, creg
);
999 return write_fifo(ep
, req
);
1002 if (csr
& AT91_UDP_STALLSENT
) {
1003 /* STALLSENT bit == ISOERR */
1004 if (ep
->is_iso
&& req
)
1005 req
->req
.status
= -EILSEQ
;
1007 csr
&= ~(SET_FX
| AT91_UDP_STALLSENT
);
1008 __raw_writel(csr
, creg
);
1009 csr
= __raw_readl(creg
);
1011 if (req
&& (csr
& RX_DATA_READY
))
1012 return read_fifo(ep
, req
);
1019 struct usb_ctrlrequest r
;
1022 static void handle_setup(struct at91_udc
*udc
, struct at91_ep
*ep
, u32 csr
)
1024 u32 __iomem
*creg
= ep
->creg
;
1025 u8 __iomem
*dreg
= ep
->creg
+ (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
1026 unsigned rxcount
, i
= 0;
1031 /* read and ack SETUP; hard-fail for bogus packets */
1032 rxcount
= (csr
& AT91_UDP_RXBYTECNT
) >> 16;
1033 if (likely(rxcount
== 8)) {
1035 pkt
.raw
[i
++] = __raw_readb(dreg
);
1036 if (pkt
.r
.bRequestType
& USB_DIR_IN
) {
1037 csr
|= AT91_UDP_DIR
;
1040 csr
&= ~AT91_UDP_DIR
;
1044 // REVISIT this happens sometimes under load; why??
1045 ERR("SETUP len %d, csr %08x\n", rxcount
, csr
);
1049 csr
&= ~(SET_FX
| AT91_UDP_RXSETUP
);
1050 __raw_writel(csr
, creg
);
1051 udc
->wait_for_addr_ack
= 0;
1052 udc
->wait_for_config_ack
= 0;
1054 if (unlikely(status
!= 0))
1057 #define w_index le16_to_cpu(pkt.r.wIndex)
1058 #define w_value le16_to_cpu(pkt.r.wValue)
1059 #define w_length le16_to_cpu(pkt.r.wLength)
1061 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1062 pkt
.r
.bRequestType
, pkt
.r
.bRequest
,
1063 w_value
, w_index
, w_length
);
1066 * A few standard requests get handled here, ones that touch
1067 * hardware ... notably for device and endpoint features.
1069 udc
->req_pending
= 1;
1070 csr
= __raw_readl(creg
);
1073 switch ((pkt
.r
.bRequestType
<< 8) | pkt
.r
.bRequest
) {
1075 case ((USB_TYPE_STANDARD
|USB_RECIP_DEVICE
) << 8)
1076 | USB_REQ_SET_ADDRESS
:
1077 __raw_writel(csr
| AT91_UDP_TXPKTRDY
, creg
);
1078 udc
->addr
= w_value
;
1079 udc
->wait_for_addr_ack
= 1;
1080 udc
->req_pending
= 0;
1081 /* FADDR is set later, when we ack host STATUS */
1084 case ((USB_TYPE_STANDARD
|USB_RECIP_DEVICE
) << 8)
1085 | USB_REQ_SET_CONFIGURATION
:
1086 tmp
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
) & AT91_UDP_CONFG
;
1088 udc
->wait_for_config_ack
= (tmp
== 0);
1090 udc
->wait_for_config_ack
= (tmp
!= 0);
1091 if (udc
->wait_for_config_ack
)
1092 VDBG("wait for config\n");
1093 /* CONFG is toggled later, if gadget driver succeeds */
1097 * Hosts may set or clear remote wakeup status, and
1098 * devices may report they're VBUS powered.
1100 case ((USB_DIR_IN
|USB_TYPE_STANDARD
|USB_RECIP_DEVICE
) << 8)
1101 | USB_REQ_GET_STATUS
:
1102 tmp
= (udc
->selfpowered
<< USB_DEVICE_SELF_POWERED
);
1103 if (at91_udp_read(udc
, AT91_UDP_GLB_STAT
) & AT91_UDP_ESR
)
1104 tmp
|= (1 << USB_DEVICE_REMOTE_WAKEUP
);
1105 PACKET("get device status\n");
1106 __raw_writeb(tmp
, dreg
);
1107 __raw_writeb(0, dreg
);
1109 /* then STATUS starts later, automatically */
1110 case ((USB_TYPE_STANDARD
|USB_RECIP_DEVICE
) << 8)
1111 | USB_REQ_SET_FEATURE
:
1112 if (w_value
!= USB_DEVICE_REMOTE_WAKEUP
)
1114 tmp
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
1115 tmp
|= AT91_UDP_ESR
;
1116 at91_udp_write(udc
, AT91_UDP_GLB_STAT
, tmp
);
1118 case ((USB_TYPE_STANDARD
|USB_RECIP_DEVICE
) << 8)
1119 | USB_REQ_CLEAR_FEATURE
:
1120 if (w_value
!= USB_DEVICE_REMOTE_WAKEUP
)
1122 tmp
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
1123 tmp
&= ~AT91_UDP_ESR
;
1124 at91_udp_write(udc
, AT91_UDP_GLB_STAT
, tmp
);
1128 * Interfaces have no feature settings; this is pretty useless.
1129 * we won't even insist the interface exists...
1131 case ((USB_DIR_IN
|USB_TYPE_STANDARD
|USB_RECIP_INTERFACE
) << 8)
1132 | USB_REQ_GET_STATUS
:
1133 PACKET("get interface status\n");
1134 __raw_writeb(0, dreg
);
1135 __raw_writeb(0, dreg
);
1137 /* then STATUS starts later, automatically */
1138 case ((USB_TYPE_STANDARD
|USB_RECIP_INTERFACE
) << 8)
1139 | USB_REQ_SET_FEATURE
:
1140 case ((USB_TYPE_STANDARD
|USB_RECIP_INTERFACE
) << 8)
1141 | USB_REQ_CLEAR_FEATURE
:
1145 * Hosts may clear bulk/intr endpoint halt after the gadget
1146 * driver sets it (not widely used); or set it (for testing)
1148 case ((USB_DIR_IN
|USB_TYPE_STANDARD
|USB_RECIP_ENDPOINT
) << 8)
1149 | USB_REQ_GET_STATUS
:
1150 tmp
= w_index
& USB_ENDPOINT_NUMBER_MASK
;
1152 if (tmp
>= NUM_ENDPOINTS
|| (tmp
&& !ep
->desc
))
1156 if ((w_index
& USB_DIR_IN
)) {
1159 } else if (ep
->is_in
)
1162 PACKET("get %s status\n", ep
->ep
.name
);
1163 if (__raw_readl(ep
->creg
) & AT91_UDP_FORCESTALL
)
1164 tmp
= (1 << USB_ENDPOINT_HALT
);
1167 __raw_writeb(tmp
, dreg
);
1168 __raw_writeb(0, dreg
);
1170 /* then STATUS starts later, automatically */
1171 case ((USB_TYPE_STANDARD
|USB_RECIP_ENDPOINT
) << 8)
1172 | USB_REQ_SET_FEATURE
:
1173 tmp
= w_index
& USB_ENDPOINT_NUMBER_MASK
;
1175 if (w_value
!= USB_ENDPOINT_HALT
|| tmp
>= NUM_ENDPOINTS
)
1177 if (!ep
->desc
|| ep
->is_iso
)
1179 if ((w_index
& USB_DIR_IN
)) {
1182 } else if (ep
->is_in
)
1185 tmp
= __raw_readl(ep
->creg
);
1187 tmp
|= CLR_FX
| AT91_UDP_FORCESTALL
;
1188 __raw_writel(tmp
, ep
->creg
);
1190 case ((USB_TYPE_STANDARD
|USB_RECIP_ENDPOINT
) << 8)
1191 | USB_REQ_CLEAR_FEATURE
:
1192 tmp
= w_index
& USB_ENDPOINT_NUMBER_MASK
;
1194 if (w_value
!= USB_ENDPOINT_HALT
|| tmp
>= NUM_ENDPOINTS
)
1198 if (!ep
->desc
|| ep
->is_iso
)
1200 if ((w_index
& USB_DIR_IN
)) {
1203 } else if (ep
->is_in
)
1206 at91_udp_write(udc
, AT91_UDP_RST_EP
, ep
->int_mask
);
1207 at91_udp_write(udc
, AT91_UDP_RST_EP
, 0);
1208 tmp
= __raw_readl(ep
->creg
);
1210 tmp
&= ~(SET_FX
| AT91_UDP_FORCESTALL
);
1211 __raw_writel(tmp
, ep
->creg
);
1212 if (!list_empty(&ep
->queue
))
1221 /* pass request up to the gadget driver */
1223 status
= udc
->driver
->setup(&udc
->gadget
, &pkt
.r
);
1228 VDBG("req %02x.%02x protocol STALL; stat %d\n",
1229 pkt
.r
.bRequestType
, pkt
.r
.bRequest
, status
);
1230 csr
|= AT91_UDP_FORCESTALL
;
1231 __raw_writel(csr
, creg
);
1232 udc
->req_pending
= 0;
1237 /* immediate successful (IN) STATUS after zero length DATA */
1238 PACKET("ep0 in/status\n");
1240 csr
|= AT91_UDP_TXPKTRDY
;
1241 __raw_writel(csr
, creg
);
1242 udc
->req_pending
= 0;
1246 static void handle_ep0(struct at91_udc
*udc
)
1248 struct at91_ep
*ep0
= &udc
->ep
[0];
1249 u32 __iomem
*creg
= ep0
->creg
;
1250 u32 csr
= __raw_readl(creg
);
1251 struct at91_request
*req
;
1253 if (unlikely(csr
& AT91_UDP_STALLSENT
)) {
1255 udc
->req_pending
= 0;
1257 csr
&= ~(SET_FX
| AT91_UDP_STALLSENT
| AT91_UDP_FORCESTALL
);
1258 __raw_writel(csr
, creg
);
1259 VDBG("ep0 stalled\n");
1260 csr
= __raw_readl(creg
);
1262 if (csr
& AT91_UDP_RXSETUP
) {
1264 udc
->req_pending
= 0;
1265 handle_setup(udc
, ep0
, csr
);
1269 if (list_empty(&ep0
->queue
))
1272 req
= list_entry(ep0
->queue
.next
, struct at91_request
, queue
);
1274 /* host ACKed an IN packet that we sent */
1275 if (csr
& AT91_UDP_TXCOMP
) {
1277 csr
&= ~(SET_FX
| AT91_UDP_TXCOMP
);
1279 /* write more IN DATA? */
1280 if (req
&& ep0
->is_in
) {
1282 udc
->req_pending
= 0;
1286 * - last IN DATA packet (including GET_STATUS)
1287 * - IN/STATUS for OUT DATA
1288 * - IN/STATUS for any zero-length DATA stage
1289 * except for the IN DATA case, the host should send
1290 * an OUT status later, which we'll ack.
1293 udc
->req_pending
= 0;
1294 __raw_writel(csr
, creg
);
1297 * SET_ADDRESS takes effect only after the STATUS
1298 * (to the original address) gets acked.
1300 if (udc
->wait_for_addr_ack
) {
1303 at91_udp_write(udc
, AT91_UDP_FADDR
,
1304 AT91_UDP_FEN
| udc
->addr
);
1305 tmp
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
1306 tmp
&= ~AT91_UDP_FADDEN
;
1308 tmp
|= AT91_UDP_FADDEN
;
1309 at91_udp_write(udc
, AT91_UDP_GLB_STAT
, tmp
);
1311 udc
->wait_for_addr_ack
= 0;
1312 VDBG("address %d\n", udc
->addr
);
1317 /* OUT packet arrived ... */
1318 else if (csr
& AT91_UDP_RX_DATA_BK0
) {
1320 csr
&= ~(SET_FX
| AT91_UDP_RX_DATA_BK0
);
1322 /* OUT DATA stage */
1325 if (handle_ep(ep0
)) {
1326 /* send IN/STATUS */
1327 PACKET("ep0 in/status\n");
1328 csr
= __raw_readl(creg
);
1330 csr
|= CLR_FX
| AT91_UDP_TXPKTRDY
;
1331 __raw_writel(csr
, creg
);
1332 udc
->req_pending
= 0;
1334 } else if (udc
->req_pending
) {
1336 * AT91 hardware has a hard time with this
1337 * "deferred response" mode for control-OUT
1338 * transfers. (For control-IN it's fine.)
1340 * The normal solution leaves OUT data in the
1341 * fifo until the gadget driver is ready.
1342 * We couldn't do that here without disabling
1343 * the IRQ that tells about SETUP packets,
1344 * e.g. when the host gets impatient...
1346 * Working around it by copying into a buffer
1347 * would almost be a non-deferred response,
1348 * except that it wouldn't permit reliable
1349 * stalling of the request. Instead, demand
1350 * that gadget drivers not use this mode.
1352 DBG("no control-OUT deferred responses!\n");
1353 __raw_writel(csr
| AT91_UDP_FORCESTALL
, creg
);
1354 udc
->req_pending
= 0;
1357 /* STATUS stage for control-IN; ack. */
1359 PACKET("ep0 out/status ACK\n");
1360 __raw_writel(csr
, creg
);
1362 /* "early" status stage */
1369 static irqreturn_t
at91_udc_irq (int irq
, void *_udc
)
1371 struct at91_udc
*udc
= _udc
;
1377 status
= at91_udp_read(udc
, AT91_UDP_ISR
)
1378 & at91_udp_read(udc
, AT91_UDP_IMR
);
1382 /* USB reset irq: not maskable */
1383 if (status
& AT91_UDP_ENDBUSRES
) {
1384 at91_udp_write(udc
, AT91_UDP_IDR
, ~MINIMUS_INTERRUPTUS
);
1385 at91_udp_write(udc
, AT91_UDP_IER
, MINIMUS_INTERRUPTUS
);
1386 /* Atmel code clears this irq twice */
1387 at91_udp_write(udc
, AT91_UDP_ICR
, AT91_UDP_ENDBUSRES
);
1388 at91_udp_write(udc
, AT91_UDP_ICR
, AT91_UDP_ENDBUSRES
);
1389 VDBG("end bus reset\n");
1394 at91_udp_write(udc
, AT91_UDP_CSR(0),
1395 AT91_UDP_EPEDS
| AT91_UDP_EPTYPE_CTRL
);
1396 udc
->gadget
.speed
= USB_SPEED_FULL
;
1398 at91_udp_write(udc
, AT91_UDP_IER
, AT91_UDP_EP(0));
1401 * NOTE: this driver keeps clocks off unless the
1402 * USB host is present. That saves power, but for
1403 * boards that don't support VBUS detection, both
1404 * clocks need to be active most of the time.
1407 /* host initiated suspend (3+ms bus idle) */
1408 } else if (status
& AT91_UDP_RXSUSP
) {
1409 at91_udp_write(udc
, AT91_UDP_IDR
, AT91_UDP_RXSUSP
);
1410 at91_udp_write(udc
, AT91_UDP_IER
, AT91_UDP_RXRSM
);
1411 at91_udp_write(udc
, AT91_UDP_ICR
, AT91_UDP_RXSUSP
);
1412 // VDBG("bus suspend\n");
1418 * NOTE: when suspending a VBUS-powered device, the
1419 * gadget driver should switch into slow clock mode
1420 * and then into standby to avoid drawing more than
1421 * 500uA power (2500uA for some high-power configs).
1423 if (udc
->driver
&& udc
->driver
->suspend
)
1424 udc
->driver
->suspend(&udc
->gadget
);
1426 /* host initiated resume */
1427 } else if (status
& AT91_UDP_RXRSM
) {
1428 at91_udp_write(udc
, AT91_UDP_IDR
, AT91_UDP_RXRSM
);
1429 at91_udp_write(udc
, AT91_UDP_IER
, AT91_UDP_RXSUSP
);
1430 at91_udp_write(udc
, AT91_UDP_ICR
, AT91_UDP_RXRSM
);
1431 // VDBG("bus resume\n");
1432 if (!udc
->suspended
)
1437 * NOTE: for a VBUS-powered device, the gadget driver
1438 * would normally want to switch out of slow clock
1439 * mode into normal mode.
1441 if (udc
->driver
&& udc
->driver
->resume
)
1442 udc
->driver
->resume(&udc
->gadget
);
1444 /* endpoint IRQs are cleared by handling them */
1448 struct at91_ep
*ep
= &udc
->ep
[1];
1452 for (i
= 1; i
< NUM_ENDPOINTS
; i
++) {
1464 /*-------------------------------------------------------------------------*/
1466 static void nop_release(struct device
*dev
)
1468 /* nothing to free */
1471 static struct at91_udc controller
= {
1473 .ops
= &at91_udc_ops
,
1474 .ep0
= &controller
.ep
[0].ep
,
1475 .name
= driver_name
,
1477 .init_name
= "gadget",
1478 .release
= nop_release
,
1484 .ops
= &at91_ep_ops
,
1493 .ops
= &at91_ep_ops
,
1503 .ops
= &at91_ep_ops
,
1512 /* could actually do bulk too */
1514 .ops
= &at91_ep_ops
,
1523 .ops
= &at91_ep_ops
,
1533 .ops
= &at91_ep_ops
,
1540 /* ep6 and ep7 are also reserved (custom silicon might use them) */
1543 static irqreturn_t
at91_vbus_irq(int irq
, void *_udc
)
1545 struct at91_udc
*udc
= _udc
;
1548 /* vbus needs at least brief debouncing */
1550 value
= gpio_get_value(udc
->board
.vbus_pin
);
1551 if (value
!= udc
->vbus
)
1552 at91_vbus_session(&udc
->gadget
, value
);
1557 int usb_gadget_register_driver (struct usb_gadget_driver
*driver
)
1559 struct at91_udc
*udc
= &controller
;
1563 || driver
->speed
< USB_SPEED_FULL
1565 || !driver
->setup
) {
1566 DBG("bad parameter.\n");
1571 DBG("UDC already has a gadget driver\n");
1575 udc
->driver
= driver
;
1576 udc
->gadget
.dev
.driver
= &driver
->driver
;
1577 dev_set_drvdata(&udc
->gadget
.dev
, &driver
->driver
);
1579 udc
->selfpowered
= 1;
1581 retval
= driver
->bind(&udc
->gadget
);
1583 DBG("driver->bind() returned %d\n", retval
);
1585 udc
->gadget
.dev
.driver
= NULL
;
1586 dev_set_drvdata(&udc
->gadget
.dev
, NULL
);
1588 udc
->selfpowered
= 0;
1592 local_irq_disable();
1596 DBG("bound to %s\n", driver
->driver
.name
);
1599 EXPORT_SYMBOL (usb_gadget_register_driver
);
1601 int usb_gadget_unregister_driver (struct usb_gadget_driver
*driver
)
1603 struct at91_udc
*udc
= &controller
;
1605 if (!driver
|| driver
!= udc
->driver
|| !driver
->unbind
)
1608 local_irq_disable();
1610 at91_udp_write(udc
, AT91_UDP_IDR
, ~0);
1614 driver
->unbind(&udc
->gadget
);
1615 udc
->gadget
.dev
.driver
= NULL
;
1616 dev_set_drvdata(&udc
->gadget
.dev
, NULL
);
1619 DBG("unbound from %s\n", driver
->driver
.name
);
1622 EXPORT_SYMBOL (usb_gadget_unregister_driver
);
1624 /*-------------------------------------------------------------------------*/
1626 static void at91udc_shutdown(struct platform_device
*dev
)
1628 /* force disconnect on reboot */
1629 pullup(platform_get_drvdata(dev
), 0);
1632 static int __init
at91udc_probe(struct platform_device
*pdev
)
1634 struct device
*dev
= &pdev
->dev
;
1635 struct at91_udc
*udc
;
1637 struct resource
*res
;
1639 if (!dev
->platform_data
) {
1640 /* small (so we copy it) but critical! */
1641 DBG("missing platform_data\n");
1645 if (pdev
->num_resources
!= 2) {
1646 DBG("invalid num_resources\n");
1649 if ((pdev
->resource
[0].flags
!= IORESOURCE_MEM
)
1650 || (pdev
->resource
[1].flags
!= IORESOURCE_IRQ
)) {
1651 DBG("invalid resource type\n");
1655 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
1659 if (!request_mem_region(res
->start
,
1660 res
->end
- res
->start
+ 1,
1662 DBG("someone's using UDC memory\n");
1666 /* init software state */
1668 udc
->gadget
.dev
.parent
= dev
;
1669 udc
->board
= *(struct at91_udc_data
*) dev
->platform_data
;
1673 /* rm9200 needs manual D+ pullup; off by default */
1674 if (cpu_is_at91rm9200()) {
1675 if (udc
->board
.pullup_pin
<= 0) {
1676 DBG("no D+ pullup?\n");
1680 retval
= gpio_request(udc
->board
.pullup_pin
, "udc_pullup");
1682 DBG("D+ pullup is busy\n");
1685 gpio_direction_output(udc
->board
.pullup_pin
,
1686 udc
->board
.pullup_active_low
);
1689 /* newer chips have more FIFO memory than rm9200 */
1690 if (cpu_is_at91sam9260()) {
1691 udc
->ep
[0].maxpacket
= 64;
1692 udc
->ep
[3].maxpacket
= 64;
1693 udc
->ep
[4].maxpacket
= 512;
1694 udc
->ep
[5].maxpacket
= 512;
1695 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
1696 udc
->ep
[3].maxpacket
= 64;
1697 } else if (cpu_is_at91sam9263()) {
1698 udc
->ep
[0].maxpacket
= 64;
1699 udc
->ep
[3].maxpacket
= 64;
1702 udc
->udp_baseaddr
= ioremap(res
->start
, res
->end
- res
->start
+ 1);
1703 if (!udc
->udp_baseaddr
) {
1710 /* get interface and function clocks */
1711 udc
->iclk
= clk_get(dev
, "udc_clk");
1712 udc
->fclk
= clk_get(dev
, "udpck");
1713 if (IS_ERR(udc
->iclk
) || IS_ERR(udc
->fclk
)) {
1714 DBG("clocks missing\n");
1716 /* NOTE: we "know" here that refcounts on these are NOPs */
1720 retval
= device_register(&udc
->gadget
.dev
);
1724 /* don't do anything until we have both gadget driver and VBUS */
1725 clk_enable(udc
->iclk
);
1726 at91_udp_write(udc
, AT91_UDP_TXVC
, AT91_UDP_TXVC_TXVDIS
);
1727 at91_udp_write(udc
, AT91_UDP_IDR
, 0xffffffff);
1728 /* Clear all pending interrupts - UDP may be used by bootloader. */
1729 at91_udp_write(udc
, AT91_UDP_ICR
, 0xffffffff);
1730 clk_disable(udc
->iclk
);
1732 /* request UDC and maybe VBUS irqs */
1733 udc
->udp_irq
= platform_get_irq(pdev
, 0);
1734 retval
= request_irq(udc
->udp_irq
, at91_udc_irq
,
1735 IRQF_DISABLED
, driver_name
, udc
);
1737 DBG("request irq %d failed\n", udc
->udp_irq
);
1740 if (udc
->board
.vbus_pin
> 0) {
1741 retval
= gpio_request(udc
->board
.vbus_pin
, "udc_vbus");
1743 DBG("request vbus pin failed\n");
1746 gpio_direction_input(udc
->board
.vbus_pin
);
1749 * Get the initial state of VBUS - we cannot expect
1750 * a pending interrupt.
1752 udc
->vbus
= gpio_get_value(udc
->board
.vbus_pin
);
1753 if (request_irq(udc
->board
.vbus_pin
, at91_vbus_irq
,
1754 IRQF_DISABLED
, driver_name
, udc
)) {
1755 DBG("request vbus irq %d failed\n",
1756 udc
->board
.vbus_pin
);
1761 DBG("no VBUS detection, assuming always-on\n");
1764 dev_set_drvdata(dev
, udc
);
1765 device_init_wakeup(dev
, 1);
1766 create_debug_file(udc
);
1768 INFO("%s version %s\n", driver_name
, DRIVER_VERSION
);
1772 if (udc
->board
.vbus_pin
> 0)
1773 gpio_free(udc
->board
.vbus_pin
);
1775 free_irq(udc
->udp_irq
, udc
);
1777 device_unregister(&udc
->gadget
.dev
);
1779 iounmap(udc
->udp_baseaddr
);
1781 if (cpu_is_at91rm9200())
1782 gpio_free(udc
->board
.pullup_pin
);
1784 release_mem_region(res
->start
, res
->end
- res
->start
+ 1);
1785 DBG("%s probe failed, %d\n", driver_name
, retval
);
1789 static int __exit
at91udc_remove(struct platform_device
*pdev
)
1791 struct at91_udc
*udc
= platform_get_drvdata(pdev
);
1792 struct resource
*res
;
1801 device_init_wakeup(&pdev
->dev
, 0);
1802 remove_debug_file(udc
);
1803 if (udc
->board
.vbus_pin
> 0) {
1804 free_irq(udc
->board
.vbus_pin
, udc
);
1805 gpio_free(udc
->board
.vbus_pin
);
1807 free_irq(udc
->udp_irq
, udc
);
1808 device_unregister(&udc
->gadget
.dev
);
1810 iounmap(udc
->udp_baseaddr
);
1812 if (cpu_is_at91rm9200())
1813 gpio_free(udc
->board
.pullup_pin
);
1815 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
1816 release_mem_region(res
->start
, res
->end
- res
->start
+ 1);
1825 static int at91udc_suspend(struct platform_device
*pdev
, pm_message_t mesg
)
1827 struct at91_udc
*udc
= platform_get_drvdata(pdev
);
1828 int wake
= udc
->driver
&& device_may_wakeup(&pdev
->dev
);
1830 /* Unless we can act normally to the host (letting it wake us up
1831 * whenever it has work for us) force disconnect. Wakeup requires
1832 * PLLB for USB events (signaling for reset, wakeup, or incoming
1833 * tokens) and VBUS irqs (on systems which support them).
1835 if ((!udc
->suspended
&& udc
->addr
)
1837 || at91_suspend_entering_slow_clock()) {
1841 enable_irq_wake(udc
->udp_irq
);
1843 udc
->active_suspend
= wake
;
1844 if (udc
->board
.vbus_pin
> 0 && wake
)
1845 enable_irq_wake(udc
->board
.vbus_pin
);
1849 static int at91udc_resume(struct platform_device
*pdev
)
1851 struct at91_udc
*udc
= platform_get_drvdata(pdev
);
1853 if (udc
->board
.vbus_pin
> 0 && udc
->active_suspend
)
1854 disable_irq_wake(udc
->board
.vbus_pin
);
1856 /* maybe reconnect to host; if so, clocks on */
1857 if (udc
->active_suspend
)
1858 disable_irq_wake(udc
->udp_irq
);
1864 #define at91udc_suspend NULL
1865 #define at91udc_resume NULL
1868 static struct platform_driver at91_udc_driver
= {
1869 .remove
= __exit_p(at91udc_remove
),
1870 .shutdown
= at91udc_shutdown
,
1871 .suspend
= at91udc_suspend
,
1872 .resume
= at91udc_resume
,
1874 .name
= (char *) driver_name
,
1875 .owner
= THIS_MODULE
,
1879 static int __init
udc_init_module(void)
1881 return platform_driver_probe(&at91_udc_driver
, at91udc_probe
);
1883 module_init(udc_init_module
);
1885 static void __exit
udc_exit_module(void)
1887 platform_driver_unregister(&at91_udc_driver
);
1889 module_exit(udc_exit_module
);
1891 MODULE_DESCRIPTION("AT91 udc driver");
1892 MODULE_AUTHOR("Thomas Rathbone, David Brownell");
1893 MODULE_LICENSE("GPL");
1894 MODULE_ALIAS("platform:at91_udc");