2 * gadget.c - DesignWare USB3 DRD Controller Gadget Framework Link
4 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
6 * Authors: Felipe Balbi <balbi@ti.com>,
7 * Sebastian Andrzej Siewior <bigeasy@linutronix.de>
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions, and the following disclaimer,
14 * without modification.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. The names of the above-listed copyright holders may not be used
19 * to endorse or promote products derived from this software without
20 * specific prior written permission.
22 * ALTERNATIVELY, this software may be distributed under the terms of the
23 * GNU General Public License ("GPL") version 2, as published by the Free
24 * Software Foundation.
26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
27 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
28 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
30 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
31 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
32 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
33 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
34 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
35 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
36 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 #include <linux/kernel.h>
40 #include <linux/delay.h>
41 #include <linux/slab.h>
42 #include <linux/spinlock.h>
43 #include <linux/platform_device.h>
44 #include <linux/pm_runtime.h>
45 #include <linux/interrupt.h>
47 #include <linux/list.h>
48 #include <linux/dma-mapping.h>
50 #include <linux/usb/ch9.h>
51 #include <linux/usb/gadget.h>
58 * dwc3_gadget_set_test_mode - Enables USB2 Test Modes
59 * @dwc: pointer to our context structure
60 * @mode: the mode to set (J, K SE0 NAK, Force Enable)
62 * Caller should take care of locking. This function will
63 * return 0 on success or -EINVAL if wrong Test Selector
66 int dwc3_gadget_set_test_mode(struct dwc3
*dwc
, int mode
)
70 reg
= dwc3_readl(dwc
->regs
, DWC3_DCTL
);
71 reg
&= ~DWC3_DCTL_TSTCTRL_MASK
;
85 dwc3_writel(dwc
->regs
, DWC3_DCTL
, reg
);
91 * dwc3_gadget_set_link_state - Sets USB Link to a particular State
92 * @dwc: pointer to our context structure
93 * @state: the state to put link into
95 * Caller should take care of locking. This function will
96 * return 0 on success or -ETIMEDOUT.
98 int dwc3_gadget_set_link_state(struct dwc3
*dwc
, enum dwc3_link_state state
)
104 * Wait until device controller is ready. Only applies to 1.94a and
107 if (dwc
->revision
>= DWC3_REVISION_194A
) {
109 reg
= dwc3_readl(dwc
->regs
, DWC3_DSTS
);
110 if (reg
& DWC3_DSTS_DCNRD
)
120 reg
= dwc3_readl(dwc
->regs
, DWC3_DCTL
);
121 reg
&= ~DWC3_DCTL_ULSTCHNGREQ_MASK
;
123 /* set requested state */
124 reg
|= DWC3_DCTL_ULSTCHNGREQ(state
);
125 dwc3_writel(dwc
->regs
, DWC3_DCTL
, reg
);
128 * The following code is racy when called from dwc3_gadget_wakeup,
129 * and is not needed, at least on newer versions
131 if (dwc
->revision
>= DWC3_REVISION_194A
)
134 /* wait for a change in DSTS */
137 reg
= dwc3_readl(dwc
->regs
, DWC3_DSTS
);
139 if (DWC3_DSTS_USBLNKST(reg
) == state
)
145 dev_vdbg(dwc
->dev
, "link state change request timed out\n");
151 * dwc3_gadget_resize_tx_fifos - reallocate fifo spaces for current use-case
152 * @dwc: pointer to our context structure
154 * This function will a best effort FIFO allocation in order
155 * to improve FIFO usage and throughput, while still allowing
156 * us to enable as many endpoints as possible.
158 * Keep in mind that this operation will be highly dependent
159 * on the configured size for RAM1 - which contains TxFifo -,
160 * the amount of endpoints enabled on coreConsultant tool, and
161 * the width of the Master Bus.
163 * In the ideal world, we would always be able to satisfy the
164 * following equation:
166 * ((512 + 2 * MDWIDTH-Bytes) + (Number of IN Endpoints - 1) * \
167 * (3 * (1024 + MDWIDTH-Bytes) + MDWIDTH-Bytes)) / MDWIDTH-Bytes
169 * Unfortunately, due to many variables that's not always the case.
171 int dwc3_gadget_resize_tx_fifos(struct dwc3
*dwc
)
173 int last_fifo_depth
= 0;
179 if (!dwc
->needs_fifo_resize
)
182 ram1_depth
= DWC3_RAM1_DEPTH(dwc
->hwparams
.hwparams7
);
183 mdwidth
= DWC3_MDWIDTH(dwc
->hwparams
.hwparams0
);
185 /* MDWIDTH is represented in bits, we need it in bytes */
189 * FIXME For now we will only allocate 1 wMaxPacketSize space
190 * for each enabled endpoint, later patches will come to
191 * improve this algorithm so that we better use the internal
194 for (num
= 0; num
< DWC3_ENDPOINTS_NUM
; num
++) {
195 struct dwc3_ep
*dep
= dwc
->eps
[num
];
196 int fifo_number
= dep
->number
>> 1;
200 if (!(dep
->number
& 1))
203 if (!(dep
->flags
& DWC3_EP_ENABLED
))
206 if (usb_endpoint_xfer_bulk(dep
->endpoint
.desc
)
207 || usb_endpoint_xfer_isoc(dep
->endpoint
.desc
))
211 * REVISIT: the following assumes we will always have enough
212 * space available on the FIFO RAM for all possible use cases.
213 * Make sure that's true somehow and change FIFO allocation
216 * If we have Bulk or Isochronous endpoints, we want
217 * them to be able to be very, very fast. So we're giving
218 * those endpoints a fifo_size which is enough for 3 full
221 tmp
= mult
* (dep
->endpoint
.maxpacket
+ mdwidth
);
224 fifo_size
= DIV_ROUND_UP(tmp
, mdwidth
);
226 fifo_size
|= (last_fifo_depth
<< 16);
228 dev_vdbg(dwc
->dev
, "%s: Fifo Addr %04x Size %d\n",
229 dep
->name
, last_fifo_depth
, fifo_size
& 0xffff);
231 dwc3_writel(dwc
->regs
, DWC3_GTXFIFOSIZ(fifo_number
),
234 last_fifo_depth
+= (fifo_size
& 0xffff);
240 void dwc3_gadget_giveback(struct dwc3_ep
*dep
, struct dwc3_request
*req
,
243 struct dwc3
*dwc
= dep
->dwc
;
251 * Skip LINK TRB. We can't use req->trb and check for
252 * DWC3_TRBCTL_LINK_TRB because it points the TRB we
253 * just completed (not the LINK TRB).
255 if (((dep
->busy_slot
& DWC3_TRB_MASK
) ==
257 usb_endpoint_xfer_isoc(dep
->endpoint
.desc
))
259 } while(++i
< req
->request
.num_mapped_sgs
);
262 list_del(&req
->list
);
265 if (req
->request
.status
== -EINPROGRESS
)
266 req
->request
.status
= status
;
268 if (dwc
->ep0_bounced
&& dep
->number
== 0)
269 dwc
->ep0_bounced
= false;
271 usb_gadget_unmap_request(&dwc
->gadget
, &req
->request
,
274 dev_dbg(dwc
->dev
, "request %p from %s completed %d/%d ===> %d\n",
275 req
, dep
->name
, req
->request
.actual
,
276 req
->request
.length
, status
);
278 spin_unlock(&dwc
->lock
);
279 req
->request
.complete(&dep
->endpoint
, &req
->request
);
280 spin_lock(&dwc
->lock
);
283 static const char *dwc3_gadget_ep_cmd_string(u8 cmd
)
286 case DWC3_DEPCMD_DEPSTARTCFG
:
287 return "Start New Configuration";
288 case DWC3_DEPCMD_ENDTRANSFER
:
289 return "End Transfer";
290 case DWC3_DEPCMD_UPDATETRANSFER
:
291 return "Update Transfer";
292 case DWC3_DEPCMD_STARTTRANSFER
:
293 return "Start Transfer";
294 case DWC3_DEPCMD_CLEARSTALL
:
295 return "Clear Stall";
296 case DWC3_DEPCMD_SETSTALL
:
298 case DWC3_DEPCMD_GETEPSTATE
:
299 return "Get Endpoint State";
300 case DWC3_DEPCMD_SETTRANSFRESOURCE
:
301 return "Set Endpoint Transfer Resource";
302 case DWC3_DEPCMD_SETEPCONFIG
:
303 return "Set Endpoint Configuration";
305 return "UNKNOWN command";
309 int dwc3_send_gadget_generic_command(struct dwc3
*dwc
, int cmd
, u32 param
)
314 dwc3_writel(dwc
->regs
, DWC3_DGCMDPAR
, param
);
315 dwc3_writel(dwc
->regs
, DWC3_DGCMD
, cmd
| DWC3_DGCMD_CMDACT
);
318 reg
= dwc3_readl(dwc
->regs
, DWC3_DGCMD
);
319 if (!(reg
& DWC3_DGCMD_CMDACT
)) {
320 dev_vdbg(dwc
->dev
, "Command Complete --> %d\n",
321 DWC3_DGCMD_STATUS(reg
));
326 * We can't sleep here, because it's also called from
336 int dwc3_send_gadget_ep_cmd(struct dwc3
*dwc
, unsigned ep
,
337 unsigned cmd
, struct dwc3_gadget_ep_cmd_params
*params
)
339 struct dwc3_ep
*dep
= dwc
->eps
[ep
];
343 dev_vdbg(dwc
->dev
, "%s: cmd '%s' params %08x %08x %08x\n",
345 dwc3_gadget_ep_cmd_string(cmd
), params
->param0
,
346 params
->param1
, params
->param2
);
348 dwc3_writel(dwc
->regs
, DWC3_DEPCMDPAR0(ep
), params
->param0
);
349 dwc3_writel(dwc
->regs
, DWC3_DEPCMDPAR1(ep
), params
->param1
);
350 dwc3_writel(dwc
->regs
, DWC3_DEPCMDPAR2(ep
), params
->param2
);
352 dwc3_writel(dwc
->regs
, DWC3_DEPCMD(ep
), cmd
| DWC3_DEPCMD_CMDACT
);
354 reg
= dwc3_readl(dwc
->regs
, DWC3_DEPCMD(ep
));
355 if (!(reg
& DWC3_DEPCMD_CMDACT
)) {
356 dev_vdbg(dwc
->dev
, "Command Complete --> %d\n",
357 DWC3_DEPCMD_STATUS(reg
));
362 * We can't sleep here, because it is also called from
373 static dma_addr_t
dwc3_trb_dma_offset(struct dwc3_ep
*dep
,
374 struct dwc3_trb
*trb
)
376 u32 offset
= (char *) trb
- (char *) dep
->trb_pool
;
378 return dep
->trb_pool_dma
+ offset
;
381 static int dwc3_alloc_trb_pool(struct dwc3_ep
*dep
)
383 struct dwc3
*dwc
= dep
->dwc
;
388 if (dep
->number
== 0 || dep
->number
== 1)
391 dep
->trb_pool
= dma_alloc_coherent(dwc
->dev
,
392 sizeof(struct dwc3_trb
) * DWC3_TRB_NUM
,
393 &dep
->trb_pool_dma
, GFP_KERNEL
);
394 if (!dep
->trb_pool
) {
395 dev_err(dep
->dwc
->dev
, "failed to allocate trb pool for %s\n",
403 static void dwc3_free_trb_pool(struct dwc3_ep
*dep
)
405 struct dwc3
*dwc
= dep
->dwc
;
407 dma_free_coherent(dwc
->dev
, sizeof(struct dwc3_trb
) * DWC3_TRB_NUM
,
408 dep
->trb_pool
, dep
->trb_pool_dma
);
410 dep
->trb_pool
= NULL
;
411 dep
->trb_pool_dma
= 0;
414 static int dwc3_gadget_start_config(struct dwc3
*dwc
, struct dwc3_ep
*dep
)
416 struct dwc3_gadget_ep_cmd_params params
;
419 memset(¶ms
, 0x00, sizeof(params
));
421 if (dep
->number
!= 1) {
422 cmd
= DWC3_DEPCMD_DEPSTARTCFG
;
423 /* XferRscIdx == 0 for ep0 and 2 for the remaining */
424 if (dep
->number
> 1) {
425 if (dwc
->start_config_issued
)
427 dwc
->start_config_issued
= true;
428 cmd
|= DWC3_DEPCMD_PARAM(2);
431 return dwc3_send_gadget_ep_cmd(dwc
, 0, cmd
, ¶ms
);
437 static int dwc3_gadget_set_ep_config(struct dwc3
*dwc
, struct dwc3_ep
*dep
,
438 const struct usb_endpoint_descriptor
*desc
,
439 const struct usb_ss_ep_comp_descriptor
*comp_desc
,
442 struct dwc3_gadget_ep_cmd_params params
;
444 memset(¶ms
, 0x00, sizeof(params
));
446 params
.param0
= DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc
))
447 | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc
));
449 /* Burst size is only needed in SuperSpeed mode */
450 if (dwc
->gadget
.speed
== USB_SPEED_SUPER
) {
451 u32 burst
= dep
->endpoint
.maxburst
- 1;
453 params
.param0
|= DWC3_DEPCFG_BURST_SIZE(burst
);
457 params
.param0
|= DWC3_DEPCFG_IGN_SEQ_NUM
;
459 params
.param1
= DWC3_DEPCFG_XFER_COMPLETE_EN
460 | DWC3_DEPCFG_XFER_NOT_READY_EN
;
462 if (usb_ss_max_streams(comp_desc
) && usb_endpoint_xfer_bulk(desc
)) {
463 params
.param1
|= DWC3_DEPCFG_STREAM_CAPABLE
464 | DWC3_DEPCFG_STREAM_EVENT_EN
;
465 dep
->stream_capable
= true;
468 if (usb_endpoint_xfer_isoc(desc
))
469 params
.param1
|= DWC3_DEPCFG_XFER_IN_PROGRESS_EN
;
472 * We are doing 1:1 mapping for endpoints, meaning
473 * Physical Endpoints 2 maps to Logical Endpoint 2 and
474 * so on. We consider the direction bit as part of the physical
475 * endpoint number. So USB endpoint 0x81 is 0x03.
477 params
.param1
|= DWC3_DEPCFG_EP_NUMBER(dep
->number
);
480 * We must use the lower 16 TX FIFOs even though
484 params
.param0
|= DWC3_DEPCFG_FIFO_NUMBER(dep
->number
>> 1);
486 if (desc
->bInterval
) {
487 params
.param1
|= DWC3_DEPCFG_BINTERVAL_M1(desc
->bInterval
- 1);
488 dep
->interval
= 1 << (desc
->bInterval
- 1);
491 return dwc3_send_gadget_ep_cmd(dwc
, dep
->number
,
492 DWC3_DEPCMD_SETEPCONFIG
, ¶ms
);
495 static int dwc3_gadget_set_xfer_resource(struct dwc3
*dwc
, struct dwc3_ep
*dep
)
497 struct dwc3_gadget_ep_cmd_params params
;
499 memset(¶ms
, 0x00, sizeof(params
));
501 params
.param0
= DWC3_DEPXFERCFG_NUM_XFER_RES(1);
503 return dwc3_send_gadget_ep_cmd(dwc
, dep
->number
,
504 DWC3_DEPCMD_SETTRANSFRESOURCE
, ¶ms
);
508 * __dwc3_gadget_ep_enable - Initializes a HW endpoint
509 * @dep: endpoint to be initialized
510 * @desc: USB Endpoint Descriptor
512 * Caller should take care of locking
514 static int __dwc3_gadget_ep_enable(struct dwc3_ep
*dep
,
515 const struct usb_endpoint_descriptor
*desc
,
516 const struct usb_ss_ep_comp_descriptor
*comp_desc
,
519 struct dwc3
*dwc
= dep
->dwc
;
523 if (!(dep
->flags
& DWC3_EP_ENABLED
)) {
524 ret
= dwc3_gadget_start_config(dwc
, dep
);
529 ret
= dwc3_gadget_set_ep_config(dwc
, dep
, desc
, comp_desc
, ignore
);
533 if (!(dep
->flags
& DWC3_EP_ENABLED
)) {
534 struct dwc3_trb
*trb_st_hw
;
535 struct dwc3_trb
*trb_link
;
537 ret
= dwc3_gadget_set_xfer_resource(dwc
, dep
);
541 dep
->endpoint
.desc
= desc
;
542 dep
->comp_desc
= comp_desc
;
543 dep
->type
= usb_endpoint_type(desc
);
544 dep
->flags
|= DWC3_EP_ENABLED
;
546 reg
= dwc3_readl(dwc
->regs
, DWC3_DALEPENA
);
547 reg
|= DWC3_DALEPENA_EP(dep
->number
);
548 dwc3_writel(dwc
->regs
, DWC3_DALEPENA
, reg
);
550 if (!usb_endpoint_xfer_isoc(desc
))
553 memset(&trb_link
, 0, sizeof(trb_link
));
555 /* Link TRB for ISOC. The HWO bit is never reset */
556 trb_st_hw
= &dep
->trb_pool
[0];
558 trb_link
= &dep
->trb_pool
[DWC3_TRB_NUM
- 1];
560 trb_link
->bpl
= lower_32_bits(dwc3_trb_dma_offset(dep
, trb_st_hw
));
561 trb_link
->bph
= upper_32_bits(dwc3_trb_dma_offset(dep
, trb_st_hw
));
562 trb_link
->ctrl
|= DWC3_TRBCTL_LINK_TRB
;
563 trb_link
->ctrl
|= DWC3_TRB_CTRL_HWO
;
569 static void dwc3_stop_active_transfer(struct dwc3
*dwc
, u32 epnum
);
570 static void dwc3_remove_requests(struct dwc3
*dwc
, struct dwc3_ep
*dep
)
572 struct dwc3_request
*req
;
574 if (!list_empty(&dep
->req_queued
)) {
575 dwc3_stop_active_transfer(dwc
, dep
->number
);
577 /* - giveback all requests to gadget driver */
578 while (!list_empty(&dep
->req_queued
)) {
579 req
= next_request(&dep
->req_queued
);
581 dwc3_gadget_giveback(dep
, req
, -ESHUTDOWN
);
585 while (!list_empty(&dep
->request_list
)) {
586 req
= next_request(&dep
->request_list
);
588 dwc3_gadget_giveback(dep
, req
, -ESHUTDOWN
);
593 * __dwc3_gadget_ep_disable - Disables a HW endpoint
594 * @dep: the endpoint to disable
596 * This function also removes requests which are currently processed ny the
597 * hardware and those which are not yet scheduled.
598 * Caller should take care of locking.
600 static int __dwc3_gadget_ep_disable(struct dwc3_ep
*dep
)
602 struct dwc3
*dwc
= dep
->dwc
;
605 dwc3_remove_requests(dwc
, dep
);
607 reg
= dwc3_readl(dwc
->regs
, DWC3_DALEPENA
);
608 reg
&= ~DWC3_DALEPENA_EP(dep
->number
);
609 dwc3_writel(dwc
->regs
, DWC3_DALEPENA
, reg
);
611 dep
->stream_capable
= false;
612 dep
->endpoint
.desc
= NULL
;
613 dep
->comp_desc
= NULL
;
620 /* -------------------------------------------------------------------------- */
622 static int dwc3_gadget_ep0_enable(struct usb_ep
*ep
,
623 const struct usb_endpoint_descriptor
*desc
)
628 static int dwc3_gadget_ep0_disable(struct usb_ep
*ep
)
633 /* -------------------------------------------------------------------------- */
635 static int dwc3_gadget_ep_enable(struct usb_ep
*ep
,
636 const struct usb_endpoint_descriptor
*desc
)
643 if (!ep
|| !desc
|| desc
->bDescriptorType
!= USB_DT_ENDPOINT
) {
644 pr_debug("dwc3: invalid parameters\n");
648 if (!desc
->wMaxPacketSize
) {
649 pr_debug("dwc3: missing wMaxPacketSize\n");
653 dep
= to_dwc3_ep(ep
);
656 if (dep
->flags
& DWC3_EP_ENABLED
) {
657 dev_WARN_ONCE(dwc
->dev
, true, "%s is already enabled\n",
662 switch (usb_endpoint_type(desc
)) {
663 case USB_ENDPOINT_XFER_CONTROL
:
664 strlcat(dep
->name
, "-control", sizeof(dep
->name
));
666 case USB_ENDPOINT_XFER_ISOC
:
667 strlcat(dep
->name
, "-isoc", sizeof(dep
->name
));
669 case USB_ENDPOINT_XFER_BULK
:
670 strlcat(dep
->name
, "-bulk", sizeof(dep
->name
));
672 case USB_ENDPOINT_XFER_INT
:
673 strlcat(dep
->name
, "-int", sizeof(dep
->name
));
676 dev_err(dwc
->dev
, "invalid endpoint transfer type\n");
679 dev_vdbg(dwc
->dev
, "Enabling %s\n", dep
->name
);
681 spin_lock_irqsave(&dwc
->lock
, flags
);
682 ret
= __dwc3_gadget_ep_enable(dep
, desc
, ep
->comp_desc
, false);
683 spin_unlock_irqrestore(&dwc
->lock
, flags
);
688 static int dwc3_gadget_ep_disable(struct usb_ep
*ep
)
696 pr_debug("dwc3: invalid parameters\n");
700 dep
= to_dwc3_ep(ep
);
703 if (!(dep
->flags
& DWC3_EP_ENABLED
)) {
704 dev_WARN_ONCE(dwc
->dev
, true, "%s is already disabled\n",
709 snprintf(dep
->name
, sizeof(dep
->name
), "ep%d%s",
711 (dep
->number
& 1) ? "in" : "out");
713 spin_lock_irqsave(&dwc
->lock
, flags
);
714 ret
= __dwc3_gadget_ep_disable(dep
);
715 spin_unlock_irqrestore(&dwc
->lock
, flags
);
720 static struct usb_request
*dwc3_gadget_ep_alloc_request(struct usb_ep
*ep
,
723 struct dwc3_request
*req
;
724 struct dwc3_ep
*dep
= to_dwc3_ep(ep
);
725 struct dwc3
*dwc
= dep
->dwc
;
727 req
= kzalloc(sizeof(*req
), gfp_flags
);
729 dev_err(dwc
->dev
, "not enough memory\n");
733 req
->epnum
= dep
->number
;
736 return &req
->request
;
739 static void dwc3_gadget_ep_free_request(struct usb_ep
*ep
,
740 struct usb_request
*request
)
742 struct dwc3_request
*req
= to_dwc3_request(request
);
748 * dwc3_prepare_one_trb - setup one TRB from one request
749 * @dep: endpoint for which this request is prepared
750 * @req: dwc3_request pointer
752 static void dwc3_prepare_one_trb(struct dwc3_ep
*dep
,
753 struct dwc3_request
*req
, dma_addr_t dma
,
754 unsigned length
, unsigned last
, unsigned chain
, unsigned node
)
756 struct dwc3
*dwc
= dep
->dwc
;
757 struct dwc3_trb
*trb
;
759 dev_vdbg(dwc
->dev
, "%s: req %p dma %08llx length %d%s%s\n",
760 dep
->name
, req
, (unsigned long long) dma
,
761 length
, last
? " last" : "",
762 chain
? " chain" : "");
764 /* Skip the LINK-TRB on ISOC */
765 if (((dep
->free_slot
& DWC3_TRB_MASK
) == DWC3_TRB_NUM
- 1) &&
766 usb_endpoint_xfer_isoc(dep
->endpoint
.desc
))
769 trb
= &dep
->trb_pool
[dep
->free_slot
& DWC3_TRB_MASK
];
772 dwc3_gadget_move_request_queued(req
);
774 req
->trb_dma
= dwc3_trb_dma_offset(dep
, trb
);
775 req
->start_slot
= dep
->free_slot
& DWC3_TRB_MASK
;
780 trb
->size
= DWC3_TRB_SIZE_LENGTH(length
);
781 trb
->bpl
= lower_32_bits(dma
);
782 trb
->bph
= upper_32_bits(dma
);
784 switch (usb_endpoint_type(dep
->endpoint
.desc
)) {
785 case USB_ENDPOINT_XFER_CONTROL
:
786 trb
->ctrl
= DWC3_TRBCTL_CONTROL_SETUP
;
789 case USB_ENDPOINT_XFER_ISOC
:
791 trb
->ctrl
= DWC3_TRBCTL_ISOCHRONOUS_FIRST
;
793 trb
->ctrl
= DWC3_TRBCTL_ISOCHRONOUS
;
795 if (!req
->request
.no_interrupt
&& !chain
)
796 trb
->ctrl
|= DWC3_TRB_CTRL_IOC
;
799 case USB_ENDPOINT_XFER_BULK
:
800 case USB_ENDPOINT_XFER_INT
:
801 trb
->ctrl
= DWC3_TRBCTL_NORMAL
;
805 * This is only possible with faulty memory because we
806 * checked it already :)
811 if (usb_endpoint_xfer_isoc(dep
->endpoint
.desc
)) {
812 trb
->ctrl
|= DWC3_TRB_CTRL_ISP_IMI
;
813 trb
->ctrl
|= DWC3_TRB_CTRL_CSP
;
815 trb
->ctrl
|= DWC3_TRB_CTRL_LST
;
819 trb
->ctrl
|= DWC3_TRB_CTRL_CHN
;
821 if (usb_endpoint_xfer_bulk(dep
->endpoint
.desc
) && dep
->stream_capable
)
822 trb
->ctrl
|= DWC3_TRB_CTRL_SID_SOFN(req
->request
.stream_id
);
824 trb
->ctrl
|= DWC3_TRB_CTRL_HWO
;
828 * dwc3_prepare_trbs - setup TRBs from requests
829 * @dep: endpoint for which requests are being prepared
830 * @starting: true if the endpoint is idle and no requests are queued.
832 * The function goes through the requests list and sets up TRBs for the
833 * transfers. The function returns once there are no more TRBs available or
834 * it runs out of requests.
836 static void dwc3_prepare_trbs(struct dwc3_ep
*dep
, bool starting
)
838 struct dwc3_request
*req
, *n
;
841 unsigned int last_one
= 0;
843 BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM
);
845 /* the first request must not be queued */
846 trbs_left
= (dep
->busy_slot
- dep
->free_slot
) & DWC3_TRB_MASK
;
848 /* Can't wrap around on a non-isoc EP since there's no link TRB */
849 if (!usb_endpoint_xfer_isoc(dep
->endpoint
.desc
)) {
850 max
= DWC3_TRB_NUM
- (dep
->free_slot
& DWC3_TRB_MASK
);
856 * If busy & slot are equal than it is either full or empty. If we are
857 * starting to process requests then we are empty. Otherwise we are
858 * full and don't do anything
863 trbs_left
= DWC3_TRB_NUM
;
865 * In case we start from scratch, we queue the ISOC requests
866 * starting from slot 1. This is done because we use ring
867 * buffer and have no LST bit to stop us. Instead, we place
868 * IOC bit every TRB_NUM/4. We try to avoid having an interrupt
869 * after the first request so we start at slot 1 and have
870 * 7 requests proceed before we hit the first IOC.
871 * Other transfer types don't use the ring buffer and are
872 * processed from the first TRB until the last one. Since we
873 * don't wrap around we have to start at the beginning.
875 if (usb_endpoint_xfer_isoc(dep
->endpoint
.desc
)) {
884 /* The last TRB is a link TRB, not used for xfer */
885 if ((trbs_left
<= 1) && usb_endpoint_xfer_isoc(dep
->endpoint
.desc
))
888 list_for_each_entry_safe(req
, n
, &dep
->request_list
, list
) {
893 if (req
->request
.num_mapped_sgs
> 0) {
894 struct usb_request
*request
= &req
->request
;
895 struct scatterlist
*sg
= request
->sg
;
896 struct scatterlist
*s
;
899 for_each_sg(sg
, s
, request
->num_mapped_sgs
, i
) {
900 unsigned chain
= true;
902 length
= sg_dma_len(s
);
903 dma
= sg_dma_address(s
);
905 if (i
== (request
->num_mapped_sgs
- 1) ||
907 if (list_is_last(&req
->list
,
920 dwc3_prepare_one_trb(dep
, req
, dma
, length
,
927 dma
= req
->request
.dma
;
928 length
= req
->request
.length
;
934 /* Is this the last request? */
935 if (list_is_last(&req
->list
, &dep
->request_list
))
938 dwc3_prepare_one_trb(dep
, req
, dma
, length
,
947 static int __dwc3_gadget_kick_transfer(struct dwc3_ep
*dep
, u16 cmd_param
,
950 struct dwc3_gadget_ep_cmd_params params
;
951 struct dwc3_request
*req
;
952 struct dwc3
*dwc
= dep
->dwc
;
956 if (start_new
&& (dep
->flags
& DWC3_EP_BUSY
)) {
957 dev_vdbg(dwc
->dev
, "%s: endpoint busy\n", dep
->name
);
960 dep
->flags
&= ~DWC3_EP_PENDING_REQUEST
;
963 * If we are getting here after a short-out-packet we don't enqueue any
964 * new requests as we try to set the IOC bit only on the last request.
967 if (list_empty(&dep
->req_queued
))
968 dwc3_prepare_trbs(dep
, start_new
);
970 /* req points to the first request which will be sent */
971 req
= next_request(&dep
->req_queued
);
973 dwc3_prepare_trbs(dep
, start_new
);
976 * req points to the first request where HWO changed from 0 to 1
978 req
= next_request(&dep
->req_queued
);
981 dep
->flags
|= DWC3_EP_PENDING_REQUEST
;
985 memset(¶ms
, 0, sizeof(params
));
988 params
.param0
= upper_32_bits(req
->trb_dma
);
989 params
.param1
= lower_32_bits(req
->trb_dma
);
990 cmd
= DWC3_DEPCMD_STARTTRANSFER
;
992 cmd
= DWC3_DEPCMD_UPDATETRANSFER
;
995 cmd
|= DWC3_DEPCMD_PARAM(cmd_param
);
996 ret
= dwc3_send_gadget_ep_cmd(dwc
, dep
->number
, cmd
, ¶ms
);
998 dev_dbg(dwc
->dev
, "failed to send STARTTRANSFER command\n");
1001 * FIXME we need to iterate over the list of requests
1002 * here and stop, unmap, free and del each of the linked
1003 * requests instead of what we do now.
1005 usb_gadget_unmap_request(&dwc
->gadget
, &req
->request
,
1007 list_del(&req
->list
);
1011 dep
->flags
|= DWC3_EP_BUSY
;
1014 dep
->resource_index
= dwc3_gadget_ep_get_transfer_index(dwc
,
1016 WARN_ON_ONCE(!dep
->resource_index
);
1022 static void __dwc3_gadget_start_isoc(struct dwc3
*dwc
,
1023 struct dwc3_ep
*dep
, u32 cur_uf
)
1027 if (list_empty(&dep
->request_list
)) {
1028 dev_vdbg(dwc
->dev
, "ISOC ep %s run out for requests.\n",
1030 dep
->flags
|= DWC3_EP_PENDING_REQUEST
;
1034 /* 4 micro frames in the future */
1035 uf
= cur_uf
+ dep
->interval
* 4;
1037 __dwc3_gadget_kick_transfer(dep
, uf
, 1);
1040 static void dwc3_gadget_start_isoc(struct dwc3
*dwc
,
1041 struct dwc3_ep
*dep
, const struct dwc3_event_depevt
*event
)
1045 mask
= ~(dep
->interval
- 1);
1046 cur_uf
= event
->parameters
& mask
;
1048 __dwc3_gadget_start_isoc(dwc
, dep
, cur_uf
);
1051 static int __dwc3_gadget_ep_queue(struct dwc3_ep
*dep
, struct dwc3_request
*req
)
1053 struct dwc3
*dwc
= dep
->dwc
;
1056 req
->request
.actual
= 0;
1057 req
->request
.status
= -EINPROGRESS
;
1058 req
->direction
= dep
->direction
;
1059 req
->epnum
= dep
->number
;
1062 * We only add to our list of requests now and
1063 * start consuming the list once we get XferNotReady
1066 * That way, we avoid doing anything that we don't need
1067 * to do now and defer it until the point we receive a
1068 * particular token from the Host side.
1070 * This will also avoid Host cancelling URBs due to too
1073 ret
= usb_gadget_map_request(&dwc
->gadget
, &req
->request
,
1078 list_add_tail(&req
->list
, &dep
->request_list
);
1081 * There are a few special cases:
1083 * 1. XferNotReady with empty list of requests. We need to kick the
1084 * transfer here in that situation, otherwise we will be NAKing
1085 * forever. If we get XferNotReady before gadget driver has a
1086 * chance to queue a request, we will ACK the IRQ but won't be
1087 * able to receive the data until the next request is queued.
1088 * The following code is handling exactly that.
1091 if (dep
->flags
& DWC3_EP_PENDING_REQUEST
) {
1093 * If xfernotready is already elapsed and it is a case
1094 * of isoc transfer, then issue END TRANSFER, so that
1095 * you can receive xfernotready again and can have
1096 * notion of current microframe.
1098 if (usb_endpoint_xfer_isoc(dep
->endpoint
.desc
)) {
1099 if (list_empty(&dep
->req_queued
)) {
1100 dwc3_stop_active_transfer(dwc
, dep
->number
);
1101 dep
->flags
= DWC3_EP_ENABLED
;
1106 ret
= __dwc3_gadget_kick_transfer(dep
, 0, true);
1107 if (ret
&& ret
!= -EBUSY
)
1108 dev_dbg(dwc
->dev
, "%s: failed to kick transfers\n",
1114 * 2. XferInProgress on Isoc EP with an active transfer. We need to
1115 * kick the transfer here after queuing a request, otherwise the
1116 * core may not see the modified TRB(s).
1118 if (usb_endpoint_xfer_isoc(dep
->endpoint
.desc
) &&
1119 (dep
->flags
& DWC3_EP_BUSY
) &&
1120 !(dep
->flags
& DWC3_EP_MISSED_ISOC
)) {
1121 WARN_ON_ONCE(!dep
->resource_index
);
1122 ret
= __dwc3_gadget_kick_transfer(dep
, dep
->resource_index
,
1124 if (ret
&& ret
!= -EBUSY
)
1125 dev_dbg(dwc
->dev
, "%s: failed to kick transfers\n",
1133 static int dwc3_gadget_ep_queue(struct usb_ep
*ep
, struct usb_request
*request
,
1136 struct dwc3_request
*req
= to_dwc3_request(request
);
1137 struct dwc3_ep
*dep
= to_dwc3_ep(ep
);
1138 struct dwc3
*dwc
= dep
->dwc
;
1140 unsigned long flags
;
1144 if (!dep
->endpoint
.desc
) {
1145 dev_dbg(dwc
->dev
, "trying to queue request %p to disabled %s\n",
1150 dev_vdbg(dwc
->dev
, "queing request %p to %s length %d\n",
1151 request
, ep
->name
, request
->length
);
1153 spin_lock_irqsave(&dwc
->lock
, flags
);
1154 ret
= __dwc3_gadget_ep_queue(dep
, req
);
1155 spin_unlock_irqrestore(&dwc
->lock
, flags
);
1160 static int dwc3_gadget_ep_dequeue(struct usb_ep
*ep
,
1161 struct usb_request
*request
)
1163 struct dwc3_request
*req
= to_dwc3_request(request
);
1164 struct dwc3_request
*r
= NULL
;
1166 struct dwc3_ep
*dep
= to_dwc3_ep(ep
);
1167 struct dwc3
*dwc
= dep
->dwc
;
1169 unsigned long flags
;
1172 spin_lock_irqsave(&dwc
->lock
, flags
);
1174 list_for_each_entry(r
, &dep
->request_list
, list
) {
1180 list_for_each_entry(r
, &dep
->req_queued
, list
) {
1185 /* wait until it is processed */
1186 dwc3_stop_active_transfer(dwc
, dep
->number
);
1189 dev_err(dwc
->dev
, "request %p was not queued to %s\n",
1196 /* giveback the request */
1197 dwc3_gadget_giveback(dep
, req
, -ECONNRESET
);
1200 spin_unlock_irqrestore(&dwc
->lock
, flags
);
1205 int __dwc3_gadget_ep_set_halt(struct dwc3_ep
*dep
, int value
)
1207 struct dwc3_gadget_ep_cmd_params params
;
1208 struct dwc3
*dwc
= dep
->dwc
;
1211 memset(¶ms
, 0x00, sizeof(params
));
1214 ret
= dwc3_send_gadget_ep_cmd(dwc
, dep
->number
,
1215 DWC3_DEPCMD_SETSTALL
, ¶ms
);
1217 dev_err(dwc
->dev
, "failed to %s STALL on %s\n",
1218 value
? "set" : "clear",
1221 dep
->flags
|= DWC3_EP_STALL
;
1223 if (dep
->flags
& DWC3_EP_WEDGE
)
1226 ret
= dwc3_send_gadget_ep_cmd(dwc
, dep
->number
,
1227 DWC3_DEPCMD_CLEARSTALL
, ¶ms
);
1229 dev_err(dwc
->dev
, "failed to %s STALL on %s\n",
1230 value
? "set" : "clear",
1233 dep
->flags
&= ~DWC3_EP_STALL
;
1239 static int dwc3_gadget_ep_set_halt(struct usb_ep
*ep
, int value
)
1241 struct dwc3_ep
*dep
= to_dwc3_ep(ep
);
1242 struct dwc3
*dwc
= dep
->dwc
;
1244 unsigned long flags
;
1248 spin_lock_irqsave(&dwc
->lock
, flags
);
1250 if (usb_endpoint_xfer_isoc(dep
->endpoint
.desc
)) {
1251 dev_err(dwc
->dev
, "%s is of Isochronous type\n", dep
->name
);
1256 ret
= __dwc3_gadget_ep_set_halt(dep
, value
);
1258 spin_unlock_irqrestore(&dwc
->lock
, flags
);
1263 static int dwc3_gadget_ep_set_wedge(struct usb_ep
*ep
)
1265 struct dwc3_ep
*dep
= to_dwc3_ep(ep
);
1266 struct dwc3
*dwc
= dep
->dwc
;
1267 unsigned long flags
;
1269 spin_lock_irqsave(&dwc
->lock
, flags
);
1270 dep
->flags
|= DWC3_EP_WEDGE
;
1271 spin_unlock_irqrestore(&dwc
->lock
, flags
);
1273 if (dep
->number
== 0 || dep
->number
== 1)
1274 return dwc3_gadget_ep0_set_halt(ep
, 1);
1276 return dwc3_gadget_ep_set_halt(ep
, 1);
1279 /* -------------------------------------------------------------------------- */
1281 static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc
= {
1282 .bLength
= USB_DT_ENDPOINT_SIZE
,
1283 .bDescriptorType
= USB_DT_ENDPOINT
,
1284 .bmAttributes
= USB_ENDPOINT_XFER_CONTROL
,
1287 static const struct usb_ep_ops dwc3_gadget_ep0_ops
= {
1288 .enable
= dwc3_gadget_ep0_enable
,
1289 .disable
= dwc3_gadget_ep0_disable
,
1290 .alloc_request
= dwc3_gadget_ep_alloc_request
,
1291 .free_request
= dwc3_gadget_ep_free_request
,
1292 .queue
= dwc3_gadget_ep0_queue
,
1293 .dequeue
= dwc3_gadget_ep_dequeue
,
1294 .set_halt
= dwc3_gadget_ep0_set_halt
,
1295 .set_wedge
= dwc3_gadget_ep_set_wedge
,
1298 static const struct usb_ep_ops dwc3_gadget_ep_ops
= {
1299 .enable
= dwc3_gadget_ep_enable
,
1300 .disable
= dwc3_gadget_ep_disable
,
1301 .alloc_request
= dwc3_gadget_ep_alloc_request
,
1302 .free_request
= dwc3_gadget_ep_free_request
,
1303 .queue
= dwc3_gadget_ep_queue
,
1304 .dequeue
= dwc3_gadget_ep_dequeue
,
1305 .set_halt
= dwc3_gadget_ep_set_halt
,
1306 .set_wedge
= dwc3_gadget_ep_set_wedge
,
1309 /* -------------------------------------------------------------------------- */
1311 static int dwc3_gadget_get_frame(struct usb_gadget
*g
)
1313 struct dwc3
*dwc
= gadget_to_dwc(g
);
1316 reg
= dwc3_readl(dwc
->regs
, DWC3_DSTS
);
1317 return DWC3_DSTS_SOFFN(reg
);
1320 static int dwc3_gadget_wakeup(struct usb_gadget
*g
)
1322 struct dwc3
*dwc
= gadget_to_dwc(g
);
1324 unsigned long timeout
;
1325 unsigned long flags
;
1334 spin_lock_irqsave(&dwc
->lock
, flags
);
1337 * According to the Databook Remote wakeup request should
1338 * be issued only when the device is in early suspend state.
1340 * We can check that via USB Link State bits in DSTS register.
1342 reg
= dwc3_readl(dwc
->regs
, DWC3_DSTS
);
1344 speed
= reg
& DWC3_DSTS_CONNECTSPD
;
1345 if (speed
== DWC3_DSTS_SUPERSPEED
) {
1346 dev_dbg(dwc
->dev
, "no wakeup on SuperSpeed\n");
1351 link_state
= DWC3_DSTS_USBLNKST(reg
);
1353 switch (link_state
) {
1354 case DWC3_LINK_STATE_RX_DET
: /* in HS, means Early Suspend */
1355 case DWC3_LINK_STATE_U3
: /* in HS, means SUSPEND */
1358 dev_dbg(dwc
->dev
, "can't wakeup from link state %d\n",
1364 ret
= dwc3_gadget_set_link_state(dwc
, DWC3_LINK_STATE_RECOV
);
1366 dev_err(dwc
->dev
, "failed to put link in Recovery\n");
1370 /* Recent versions do this automatically */
1371 if (dwc
->revision
< DWC3_REVISION_194A
) {
1372 /* write zeroes to Link Change Request */
1373 reg
= dwc3_readl(dwc
->regs
, DWC3_DCTL
);
1374 reg
&= ~DWC3_DCTL_ULSTCHNGREQ_MASK
;
1375 dwc3_writel(dwc
->regs
, DWC3_DCTL
, reg
);
1378 /* poll until Link State changes to ON */
1379 timeout
= jiffies
+ msecs_to_jiffies(100);
1381 while (!time_after(jiffies
, timeout
)) {
1382 reg
= dwc3_readl(dwc
->regs
, DWC3_DSTS
);
1384 /* in HS, means ON */
1385 if (DWC3_DSTS_USBLNKST(reg
) == DWC3_LINK_STATE_U0
)
1389 if (DWC3_DSTS_USBLNKST(reg
) != DWC3_LINK_STATE_U0
) {
1390 dev_err(dwc
->dev
, "failed to send remote wakeup\n");
1395 spin_unlock_irqrestore(&dwc
->lock
, flags
);
1400 static int dwc3_gadget_set_selfpowered(struct usb_gadget
*g
,
1403 struct dwc3
*dwc
= gadget_to_dwc(g
);
1404 unsigned long flags
;
1406 spin_lock_irqsave(&dwc
->lock
, flags
);
1407 dwc
->is_selfpowered
= !!is_selfpowered
;
1408 spin_unlock_irqrestore(&dwc
->lock
, flags
);
1413 static int dwc3_gadget_run_stop(struct dwc3
*dwc
, int is_on
)
1418 reg
= dwc3_readl(dwc
->regs
, DWC3_DCTL
);
1420 if (dwc
->revision
<= DWC3_REVISION_187A
) {
1421 reg
&= ~DWC3_DCTL_TRGTULST_MASK
;
1422 reg
|= DWC3_DCTL_TRGTULST_RX_DET
;
1425 if (dwc
->revision
>= DWC3_REVISION_194A
)
1426 reg
&= ~DWC3_DCTL_KEEP_CONNECT
;
1427 reg
|= DWC3_DCTL_RUN_STOP
;
1428 dwc
->pullups_connected
= true;
1430 reg
&= ~DWC3_DCTL_RUN_STOP
;
1431 dwc
->pullups_connected
= false;
1434 dwc3_writel(dwc
->regs
, DWC3_DCTL
, reg
);
1437 reg
= dwc3_readl(dwc
->regs
, DWC3_DSTS
);
1439 if (!(reg
& DWC3_DSTS_DEVCTRLHLT
))
1442 if (reg
& DWC3_DSTS_DEVCTRLHLT
)
1451 dev_vdbg(dwc
->dev
, "gadget %s data soft-%s\n",
1453 ? dwc
->gadget_driver
->function
: "no-function",
1454 is_on
? "connect" : "disconnect");
1459 static int dwc3_gadget_pullup(struct usb_gadget
*g
, int is_on
)
1461 struct dwc3
*dwc
= gadget_to_dwc(g
);
1462 unsigned long flags
;
1467 spin_lock_irqsave(&dwc
->lock
, flags
);
1468 ret
= dwc3_gadget_run_stop(dwc
, is_on
);
1469 spin_unlock_irqrestore(&dwc
->lock
, flags
);
1474 static void dwc3_gadget_enable_irq(struct dwc3
*dwc
)
1478 /* Enable all but Start and End of Frame IRQs */
1479 reg
= (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN
|
1480 DWC3_DEVTEN_EVNTOVERFLOWEN
|
1481 DWC3_DEVTEN_CMDCMPLTEN
|
1482 DWC3_DEVTEN_ERRTICERREN
|
1483 DWC3_DEVTEN_WKUPEVTEN
|
1484 DWC3_DEVTEN_ULSTCNGEN
|
1485 DWC3_DEVTEN_CONNECTDONEEN
|
1486 DWC3_DEVTEN_USBRSTEN
|
1487 DWC3_DEVTEN_DISCONNEVTEN
);
1489 dwc3_writel(dwc
->regs
, DWC3_DEVTEN
, reg
);
1492 static void dwc3_gadget_disable_irq(struct dwc3
*dwc
)
1494 /* mask all interrupts */
1495 dwc3_writel(dwc
->regs
, DWC3_DEVTEN
, 0x00);
1498 static irqreturn_t
dwc3_interrupt(int irq
, void *_dwc
);
1499 static irqreturn_t
dwc3_thread_interrupt(int irq
, void *_dwc
);
1501 static int dwc3_gadget_start(struct usb_gadget
*g
,
1502 struct usb_gadget_driver
*driver
)
1504 struct dwc3
*dwc
= gadget_to_dwc(g
);
1505 struct dwc3_ep
*dep
;
1506 unsigned long flags
;
1511 spin_lock_irqsave(&dwc
->lock
, flags
);
1513 if (dwc
->gadget_driver
) {
1514 dev_err(dwc
->dev
, "%s is already bound to %s\n",
1516 dwc
->gadget_driver
->driver
.name
);
1521 dwc
->gadget_driver
= driver
;
1523 reg
= dwc3_readl(dwc
->regs
, DWC3_DCFG
);
1524 reg
&= ~(DWC3_DCFG_SPEED_MASK
);
1527 * WORKAROUND: DWC3 revision < 2.20a have an issue
1528 * which would cause metastability state on Run/Stop
1529 * bit if we try to force the IP to USB2-only mode.
1531 * Because of that, we cannot configure the IP to any
1532 * speed other than the SuperSpeed
1536 * STAR#9000525659: Clock Domain Crossing on DCTL in
1539 if (dwc
->revision
< DWC3_REVISION_220A
)
1540 reg
|= DWC3_DCFG_SUPERSPEED
;
1542 reg
|= dwc
->maximum_speed
;
1543 dwc3_writel(dwc
->regs
, DWC3_DCFG
, reg
);
1545 dwc
->start_config_issued
= false;
1547 /* Start with SuperSpeed Default */
1548 dwc3_gadget_ep0_desc
.wMaxPacketSize
= cpu_to_le16(512);
1551 ret
= __dwc3_gadget_ep_enable(dep
, &dwc3_gadget_ep0_desc
, NULL
, false);
1553 dev_err(dwc
->dev
, "failed to enable %s\n", dep
->name
);
1558 ret
= __dwc3_gadget_ep_enable(dep
, &dwc3_gadget_ep0_desc
, NULL
, false);
1560 dev_err(dwc
->dev
, "failed to enable %s\n", dep
->name
);
1564 /* begin to receive SETUP packets */
1565 dwc
->ep0state
= EP0_SETUP_PHASE
;
1566 dwc3_ep0_out_start(dwc
);
1568 irq
= platform_get_irq(to_platform_device(dwc
->dev
), 0);
1569 ret
= request_threaded_irq(irq
, dwc3_interrupt
, dwc3_thread_interrupt
,
1570 IRQF_SHARED
| IRQF_ONESHOT
, "dwc3", dwc
);
1572 dev_err(dwc
->dev
, "failed to request irq #%d --> %d\n",
1577 dwc3_gadget_enable_irq(dwc
);
1579 spin_unlock_irqrestore(&dwc
->lock
, flags
);
1584 __dwc3_gadget_ep_disable(dwc
->eps
[0]);
1587 spin_unlock_irqrestore(&dwc
->lock
, flags
);
1592 static int dwc3_gadget_stop(struct usb_gadget
*g
,
1593 struct usb_gadget_driver
*driver
)
1595 struct dwc3
*dwc
= gadget_to_dwc(g
);
1596 unsigned long flags
;
1599 spin_lock_irqsave(&dwc
->lock
, flags
);
1601 dwc3_gadget_disable_irq(dwc
);
1602 irq
= platform_get_irq(to_platform_device(dwc
->dev
), 0);
1605 __dwc3_gadget_ep_disable(dwc
->eps
[0]);
1606 __dwc3_gadget_ep_disable(dwc
->eps
[1]);
1608 dwc
->gadget_driver
= NULL
;
1610 spin_unlock_irqrestore(&dwc
->lock
, flags
);
1615 static const struct usb_gadget_ops dwc3_gadget_ops
= {
1616 .get_frame
= dwc3_gadget_get_frame
,
1617 .wakeup
= dwc3_gadget_wakeup
,
1618 .set_selfpowered
= dwc3_gadget_set_selfpowered
,
1619 .pullup
= dwc3_gadget_pullup
,
1620 .udc_start
= dwc3_gadget_start
,
1621 .udc_stop
= dwc3_gadget_stop
,
1624 /* -------------------------------------------------------------------------- */
1626 static int dwc3_gadget_init_hw_endpoints(struct dwc3
*dwc
,
1627 u8 num
, u32 direction
)
1629 struct dwc3_ep
*dep
;
1632 for (i
= 0; i
< num
; i
++) {
1633 u8 epnum
= (i
<< 1) | (!!direction
);
1635 dep
= kzalloc(sizeof(*dep
), GFP_KERNEL
);
1637 dev_err(dwc
->dev
, "can't allocate endpoint %d\n",
1643 dep
->number
= epnum
;
1644 dwc
->eps
[epnum
] = dep
;
1646 snprintf(dep
->name
, sizeof(dep
->name
), "ep%d%s", epnum
>> 1,
1647 (epnum
& 1) ? "in" : "out");
1649 dep
->endpoint
.name
= dep
->name
;
1650 dep
->direction
= (epnum
& 1);
1652 if (epnum
== 0 || epnum
== 1) {
1653 dep
->endpoint
.maxpacket
= 512;
1654 dep
->endpoint
.maxburst
= 1;
1655 dep
->endpoint
.ops
= &dwc3_gadget_ep0_ops
;
1657 dwc
->gadget
.ep0
= &dep
->endpoint
;
1661 dep
->endpoint
.maxpacket
= 1024;
1662 dep
->endpoint
.max_streams
= 15;
1663 dep
->endpoint
.ops
= &dwc3_gadget_ep_ops
;
1664 list_add_tail(&dep
->endpoint
.ep_list
,
1665 &dwc
->gadget
.ep_list
);
1667 ret
= dwc3_alloc_trb_pool(dep
);
1672 INIT_LIST_HEAD(&dep
->request_list
);
1673 INIT_LIST_HEAD(&dep
->req_queued
);
1679 static int dwc3_gadget_init_endpoints(struct dwc3
*dwc
)
1683 INIT_LIST_HEAD(&dwc
->gadget
.ep_list
);
1685 ret
= dwc3_gadget_init_hw_endpoints(dwc
, dwc
->num_out_eps
, 0);
1687 dev_vdbg(dwc
->dev
, "failed to allocate OUT endpoints\n");
1691 ret
= dwc3_gadget_init_hw_endpoints(dwc
, dwc
->num_in_eps
, 1);
1693 dev_vdbg(dwc
->dev
, "failed to allocate IN endpoints\n");
1700 static void dwc3_gadget_free_endpoints(struct dwc3
*dwc
)
1702 struct dwc3_ep
*dep
;
1705 for (epnum
= 0; epnum
< DWC3_ENDPOINTS_NUM
; epnum
++) {
1706 dep
= dwc
->eps
[epnum
];
1710 * Physical endpoints 0 and 1 are special; they form the
1711 * bi-directional USB endpoint 0.
1713 * For those two physical endpoints, we don't allocate a TRB
1714 * pool nor do we add them the endpoints list. Due to that, we
1715 * shouldn't do these two operations otherwise we would end up
1716 * with all sorts of bugs when removing dwc3.ko.
1718 if (epnum
!= 0 && epnum
!= 1) {
1719 dwc3_free_trb_pool(dep
);
1720 list_del(&dep
->endpoint
.ep_list
);
1727 /* -------------------------------------------------------------------------- */
1729 static int __dwc3_cleanup_done_trbs(struct dwc3
*dwc
, struct dwc3_ep
*dep
,
1730 struct dwc3_request
*req
, struct dwc3_trb
*trb
,
1731 const struct dwc3_event_depevt
*event
, int status
)
1734 unsigned int s_pkt
= 0;
1735 unsigned int trb_status
;
1737 if ((trb
->ctrl
& DWC3_TRB_CTRL_HWO
) && status
!= -ESHUTDOWN
)
1739 * We continue despite the error. There is not much we
1740 * can do. If we don't clean it up we loop forever. If
1741 * we skip the TRB then it gets overwritten after a
1742 * while since we use them in a ring buffer. A BUG()
1743 * would help. Lets hope that if this occurs, someone
1744 * fixes the root cause instead of looking away :)
1746 dev_err(dwc
->dev
, "%s's TRB (%p) still owned by HW\n",
1748 count
= trb
->size
& DWC3_TRB_SIZE_MASK
;
1750 if (dep
->direction
) {
1752 trb_status
= DWC3_TRB_SIZE_TRBSTS(trb
->size
);
1753 if (trb_status
== DWC3_TRBSTS_MISSED_ISOC
) {
1754 dev_dbg(dwc
->dev
, "incomplete IN transfer %s\n",
1757 * If missed isoc occurred and there is
1758 * no request queued then issue END
1759 * TRANSFER, so that core generates
1760 * next xfernotready and we will issue
1761 * a fresh START TRANSFER.
1762 * If there are still queued request
1763 * then wait, do not issue either END
1764 * or UPDATE TRANSFER, just attach next
1765 * request in request_list during
1766 * giveback.If any future queued request
1767 * is successfully transferred then we
1768 * will issue UPDATE TRANSFER for all
1769 * request in the request_list.
1771 dep
->flags
|= DWC3_EP_MISSED_ISOC
;
1773 dev_err(dwc
->dev
, "incomplete IN transfer %s\n",
1775 status
= -ECONNRESET
;
1778 dep
->flags
&= ~DWC3_EP_MISSED_ISOC
;
1781 if (count
&& (event
->status
& DEPEVT_STATUS_SHORT
))
1786 * We assume here we will always receive the entire data block
1787 * which we should receive. Meaning, if we program RX to
1788 * receive 4K but we receive only 2K, we assume that's all we
1789 * should receive and we simply bounce the request back to the
1790 * gadget driver for further processing.
1792 req
->request
.actual
+= req
->request
.length
- count
;
1795 if ((event
->status
& DEPEVT_STATUS_LST
) &&
1796 (trb
->ctrl
& (DWC3_TRB_CTRL_LST
|
1797 DWC3_TRB_CTRL_HWO
)))
1799 if ((event
->status
& DEPEVT_STATUS_IOC
) &&
1800 (trb
->ctrl
& DWC3_TRB_CTRL_IOC
))
1805 static int dwc3_cleanup_done_reqs(struct dwc3
*dwc
, struct dwc3_ep
*dep
,
1806 const struct dwc3_event_depevt
*event
, int status
)
1808 struct dwc3_request
*req
;
1809 struct dwc3_trb
*trb
;
1815 req
= next_request(&dep
->req_queued
);
1822 slot
= req
->start_slot
+ i
;
1823 if ((slot
== DWC3_TRB_NUM
- 1) &&
1824 usb_endpoint_xfer_isoc(dep
->endpoint
.desc
))
1826 slot
%= DWC3_TRB_NUM
;
1827 trb
= &dep
->trb_pool
[slot
];
1829 ret
= __dwc3_cleanup_done_trbs(dwc
, dep
, req
, trb
,
1833 }while (++i
< req
->request
.num_mapped_sgs
);
1835 dwc3_gadget_giveback(dep
, req
, status
);
1841 if (usb_endpoint_xfer_isoc(dep
->endpoint
.desc
) &&
1842 list_empty(&dep
->req_queued
)) {
1843 if (list_empty(&dep
->request_list
)) {
1845 * If there is no entry in request list then do
1846 * not issue END TRANSFER now. Just set PENDING
1847 * flag, so that END TRANSFER is issued when an
1848 * entry is added into request list.
1850 dep
->flags
= DWC3_EP_PENDING_REQUEST
;
1852 dwc3_stop_active_transfer(dwc
, dep
->number
);
1853 dep
->flags
= DWC3_EP_ENABLED
;
1858 if ((event
->status
& DEPEVT_STATUS_IOC
) &&
1859 (trb
->ctrl
& DWC3_TRB_CTRL_IOC
))
1864 static void dwc3_endpoint_transfer_complete(struct dwc3
*dwc
,
1865 struct dwc3_ep
*dep
, const struct dwc3_event_depevt
*event
,
1868 unsigned status
= 0;
1871 if (event
->status
& DEPEVT_STATUS_BUSERR
)
1872 status
= -ECONNRESET
;
1874 clean_busy
= dwc3_cleanup_done_reqs(dwc
, dep
, event
, status
);
1876 dep
->flags
&= ~DWC3_EP_BUSY
;
1879 * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
1880 * See dwc3_gadget_linksts_change_interrupt() for 1st half.
1882 if (dwc
->revision
< DWC3_REVISION_183A
) {
1886 for (i
= 0; i
< DWC3_ENDPOINTS_NUM
; i
++) {
1889 if (!(dep
->flags
& DWC3_EP_ENABLED
))
1892 if (!list_empty(&dep
->req_queued
))
1896 reg
= dwc3_readl(dwc
->regs
, DWC3_DCTL
);
1898 dwc3_writel(dwc
->regs
, DWC3_DCTL
, reg
);
1904 static void dwc3_endpoint_interrupt(struct dwc3
*dwc
,
1905 const struct dwc3_event_depevt
*event
)
1907 struct dwc3_ep
*dep
;
1908 u8 epnum
= event
->endpoint_number
;
1910 dep
= dwc
->eps
[epnum
];
1912 if (!(dep
->flags
& DWC3_EP_ENABLED
))
1915 dev_vdbg(dwc
->dev
, "%s: %s\n", dep
->name
,
1916 dwc3_ep_event_string(event
->endpoint_event
));
1918 if (epnum
== 0 || epnum
== 1) {
1919 dwc3_ep0_interrupt(dwc
, event
);
1923 switch (event
->endpoint_event
) {
1924 case DWC3_DEPEVT_XFERCOMPLETE
:
1925 dep
->resource_index
= 0;
1927 if (usb_endpoint_xfer_isoc(dep
->endpoint
.desc
)) {
1928 dev_dbg(dwc
->dev
, "%s is an Isochronous endpoint\n",
1933 dwc3_endpoint_transfer_complete(dwc
, dep
, event
, 1);
1935 case DWC3_DEPEVT_XFERINPROGRESS
:
1936 if (!usb_endpoint_xfer_isoc(dep
->endpoint
.desc
)) {
1937 dev_dbg(dwc
->dev
, "%s is not an Isochronous endpoint\n",
1942 dwc3_endpoint_transfer_complete(dwc
, dep
, event
, 0);
1944 case DWC3_DEPEVT_XFERNOTREADY
:
1945 if (usb_endpoint_xfer_isoc(dep
->endpoint
.desc
)) {
1946 dwc3_gadget_start_isoc(dwc
, dep
, event
);
1950 dev_vdbg(dwc
->dev
, "%s: reason %s\n",
1951 dep
->name
, event
->status
&
1952 DEPEVT_STATUS_TRANSFER_ACTIVE
1954 : "Transfer Not Active");
1956 ret
= __dwc3_gadget_kick_transfer(dep
, 0, 1);
1957 if (!ret
|| ret
== -EBUSY
)
1960 dev_dbg(dwc
->dev
, "%s: failed to kick transfers\n",
1965 case DWC3_DEPEVT_STREAMEVT
:
1966 if (!usb_endpoint_xfer_bulk(dep
->endpoint
.desc
)) {
1967 dev_err(dwc
->dev
, "Stream event for non-Bulk %s\n",
1972 switch (event
->status
) {
1973 case DEPEVT_STREAMEVT_FOUND
:
1974 dev_vdbg(dwc
->dev
, "Stream %d found and started\n",
1978 case DEPEVT_STREAMEVT_NOTFOUND
:
1981 dev_dbg(dwc
->dev
, "Couldn't find suitable stream\n");
1984 case DWC3_DEPEVT_RXTXFIFOEVT
:
1985 dev_dbg(dwc
->dev
, "%s FIFO Overrun\n", dep
->name
);
1987 case DWC3_DEPEVT_EPCMDCMPLT
:
1988 dev_vdbg(dwc
->dev
, "Endpoint Command Complete\n");
1993 static void dwc3_disconnect_gadget(struct dwc3
*dwc
)
1995 if (dwc
->gadget_driver
&& dwc
->gadget_driver
->disconnect
) {
1996 spin_unlock(&dwc
->lock
);
1997 dwc
->gadget_driver
->disconnect(&dwc
->gadget
);
1998 spin_lock(&dwc
->lock
);
2002 static void dwc3_stop_active_transfer(struct dwc3
*dwc
, u32 epnum
)
2004 struct dwc3_ep
*dep
;
2005 struct dwc3_gadget_ep_cmd_params params
;
2009 dep
= dwc
->eps
[epnum
];
2011 if (!dep
->resource_index
)
2015 * NOTICE: We are violating what the Databook says about the
2016 * EndTransfer command. Ideally we would _always_ wait for the
2017 * EndTransfer Command Completion IRQ, but that's causing too
2018 * much trouble synchronizing between us and gadget driver.
2020 * We have discussed this with the IP Provider and it was
2021 * suggested to giveback all requests here, but give HW some
2022 * extra time to synchronize with the interconnect. We're using
2023 * an arbitraty 100us delay for that.
2025 * Note also that a similar handling was tested by Synopsys
2026 * (thanks a lot Paul) and nothing bad has come out of it.
2027 * In short, what we're doing is:
2029 * - Issue EndTransfer WITH CMDIOC bit set
2033 cmd
= DWC3_DEPCMD_ENDTRANSFER
;
2034 cmd
|= DWC3_DEPCMD_HIPRI_FORCERM
| DWC3_DEPCMD_CMDIOC
;
2035 cmd
|= DWC3_DEPCMD_PARAM(dep
->resource_index
);
2036 memset(¶ms
, 0, sizeof(params
));
2037 ret
= dwc3_send_gadget_ep_cmd(dwc
, dep
->number
, cmd
, ¶ms
);
2039 dep
->resource_index
= 0;
2040 dep
->flags
&= ~DWC3_EP_BUSY
;
2044 static void dwc3_stop_active_transfers(struct dwc3
*dwc
)
2048 for (epnum
= 2; epnum
< DWC3_ENDPOINTS_NUM
; epnum
++) {
2049 struct dwc3_ep
*dep
;
2051 dep
= dwc
->eps
[epnum
];
2055 if (!(dep
->flags
& DWC3_EP_ENABLED
))
2058 dwc3_remove_requests(dwc
, dep
);
2062 static void dwc3_clear_stall_all_ep(struct dwc3
*dwc
)
2066 for (epnum
= 1; epnum
< DWC3_ENDPOINTS_NUM
; epnum
++) {
2067 struct dwc3_ep
*dep
;
2068 struct dwc3_gadget_ep_cmd_params params
;
2071 dep
= dwc
->eps
[epnum
];
2075 if (!(dep
->flags
& DWC3_EP_STALL
))
2078 dep
->flags
&= ~DWC3_EP_STALL
;
2080 memset(¶ms
, 0, sizeof(params
));
2081 ret
= dwc3_send_gadget_ep_cmd(dwc
, dep
->number
,
2082 DWC3_DEPCMD_CLEARSTALL
, ¶ms
);
2087 static void dwc3_gadget_disconnect_interrupt(struct dwc3
*dwc
)
2091 dev_vdbg(dwc
->dev
, "%s\n", __func__
);
2093 reg
= dwc3_readl(dwc
->regs
, DWC3_DCTL
);
2094 reg
&= ~DWC3_DCTL_INITU1ENA
;
2095 dwc3_writel(dwc
->regs
, DWC3_DCTL
, reg
);
2097 reg
&= ~DWC3_DCTL_INITU2ENA
;
2098 dwc3_writel(dwc
->regs
, DWC3_DCTL
, reg
);
2100 dwc3_disconnect_gadget(dwc
);
2101 dwc
->start_config_issued
= false;
2103 dwc
->gadget
.speed
= USB_SPEED_UNKNOWN
;
2104 dwc
->setup_packet_pending
= false;
2107 static void dwc3_gadget_usb3_phy_suspend(struct dwc3
*dwc
, int suspend
)
2111 reg
= dwc3_readl(dwc
->regs
, DWC3_GUSB3PIPECTL(0));
2114 reg
|= DWC3_GUSB3PIPECTL_SUSPHY
;
2116 reg
&= ~DWC3_GUSB3PIPECTL_SUSPHY
;
2118 dwc3_writel(dwc
->regs
, DWC3_GUSB3PIPECTL(0), reg
);
2121 static void dwc3_gadget_usb2_phy_suspend(struct dwc3
*dwc
, int suspend
)
2125 reg
= dwc3_readl(dwc
->regs
, DWC3_GUSB2PHYCFG(0));
2128 reg
|= DWC3_GUSB2PHYCFG_SUSPHY
;
2130 reg
&= ~DWC3_GUSB2PHYCFG_SUSPHY
;
2132 dwc3_writel(dwc
->regs
, DWC3_GUSB2PHYCFG(0), reg
);
2135 static void dwc3_gadget_reset_interrupt(struct dwc3
*dwc
)
2139 dev_vdbg(dwc
->dev
, "%s\n", __func__
);
2142 * WORKAROUND: DWC3 revisions <1.88a have an issue which
2143 * would cause a missing Disconnect Event if there's a
2144 * pending Setup Packet in the FIFO.
2146 * There's no suggested workaround on the official Bug
2147 * report, which states that "unless the driver/application
2148 * is doing any special handling of a disconnect event,
2149 * there is no functional issue".
2151 * Unfortunately, it turns out that we _do_ some special
2152 * handling of a disconnect event, namely complete all
2153 * pending transfers, notify gadget driver of the
2154 * disconnection, and so on.
2156 * Our suggested workaround is to follow the Disconnect
2157 * Event steps here, instead, based on a setup_packet_pending
2158 * flag. Such flag gets set whenever we have a XferNotReady
2159 * event on EP0 and gets cleared on XferComplete for the
2164 * STAR#9000466709: RTL: Device : Disconnect event not
2165 * generated if setup packet pending in FIFO
2167 if (dwc
->revision
< DWC3_REVISION_188A
) {
2168 if (dwc
->setup_packet_pending
)
2169 dwc3_gadget_disconnect_interrupt(dwc
);
2172 /* after reset -> Default State */
2173 usb_gadget_set_state(&dwc
->gadget
, USB_STATE_DEFAULT
);
2175 /* Recent versions support automatic phy suspend and don't need this */
2176 if (dwc
->revision
< DWC3_REVISION_194A
) {
2178 dwc3_gadget_usb2_phy_suspend(dwc
, false);
2179 dwc3_gadget_usb3_phy_suspend(dwc
, false);
2182 if (dwc
->gadget
.speed
!= USB_SPEED_UNKNOWN
)
2183 dwc3_disconnect_gadget(dwc
);
2185 reg
= dwc3_readl(dwc
->regs
, DWC3_DCTL
);
2186 reg
&= ~DWC3_DCTL_TSTCTRL_MASK
;
2187 dwc3_writel(dwc
->regs
, DWC3_DCTL
, reg
);
2188 dwc
->test_mode
= false;
2190 dwc3_stop_active_transfers(dwc
);
2191 dwc3_clear_stall_all_ep(dwc
);
2192 dwc
->start_config_issued
= false;
2194 /* Reset device address to zero */
2195 reg
= dwc3_readl(dwc
->regs
, DWC3_DCFG
);
2196 reg
&= ~(DWC3_DCFG_DEVADDR_MASK
);
2197 dwc3_writel(dwc
->regs
, DWC3_DCFG
, reg
);
2200 static void dwc3_update_ram_clk_sel(struct dwc3
*dwc
, u32 speed
)
2203 u32 usb30_clock
= DWC3_GCTL_CLK_BUS
;
2206 * We change the clock only at SS but I dunno why I would want to do
2207 * this. Maybe it becomes part of the power saving plan.
2210 if (speed
!= DWC3_DSTS_SUPERSPEED
)
2214 * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
2215 * each time on Connect Done.
2220 reg
= dwc3_readl(dwc
->regs
, DWC3_GCTL
);
2221 reg
|= DWC3_GCTL_RAMCLKSEL(usb30_clock
);
2222 dwc3_writel(dwc
->regs
, DWC3_GCTL
, reg
);
2225 static void dwc3_gadget_phy_suspend(struct dwc3
*dwc
, u8 speed
)
2228 case USB_SPEED_SUPER
:
2229 dwc3_gadget_usb2_phy_suspend(dwc
, true);
2231 case USB_SPEED_HIGH
:
2232 case USB_SPEED_FULL
:
2234 dwc3_gadget_usb3_phy_suspend(dwc
, true);
2239 static void dwc3_gadget_conndone_interrupt(struct dwc3
*dwc
)
2241 struct dwc3_ep
*dep
;
2246 dev_vdbg(dwc
->dev
, "%s\n", __func__
);
2248 reg
= dwc3_readl(dwc
->regs
, DWC3_DSTS
);
2249 speed
= reg
& DWC3_DSTS_CONNECTSPD
;
2252 dwc3_update_ram_clk_sel(dwc
, speed
);
2255 case DWC3_DCFG_SUPERSPEED
:
2257 * WORKAROUND: DWC3 revisions <1.90a have an issue which
2258 * would cause a missing USB3 Reset event.
2260 * In such situations, we should force a USB3 Reset
2261 * event by calling our dwc3_gadget_reset_interrupt()
2266 * STAR#9000483510: RTL: SS : USB3 reset event may
2267 * not be generated always when the link enters poll
2269 if (dwc
->revision
< DWC3_REVISION_190A
)
2270 dwc3_gadget_reset_interrupt(dwc
);
2272 dwc3_gadget_ep0_desc
.wMaxPacketSize
= cpu_to_le16(512);
2273 dwc
->gadget
.ep0
->maxpacket
= 512;
2274 dwc
->gadget
.speed
= USB_SPEED_SUPER
;
2276 case DWC3_DCFG_HIGHSPEED
:
2277 dwc3_gadget_ep0_desc
.wMaxPacketSize
= cpu_to_le16(64);
2278 dwc
->gadget
.ep0
->maxpacket
= 64;
2279 dwc
->gadget
.speed
= USB_SPEED_HIGH
;
2281 case DWC3_DCFG_FULLSPEED2
:
2282 case DWC3_DCFG_FULLSPEED1
:
2283 dwc3_gadget_ep0_desc
.wMaxPacketSize
= cpu_to_le16(64);
2284 dwc
->gadget
.ep0
->maxpacket
= 64;
2285 dwc
->gadget
.speed
= USB_SPEED_FULL
;
2287 case DWC3_DCFG_LOWSPEED
:
2288 dwc3_gadget_ep0_desc
.wMaxPacketSize
= cpu_to_le16(8);
2289 dwc
->gadget
.ep0
->maxpacket
= 8;
2290 dwc
->gadget
.speed
= USB_SPEED_LOW
;
2294 /* Enable USB2 LPM Capability */
2296 if ((dwc
->revision
> DWC3_REVISION_194A
)
2297 && (speed
!= DWC3_DCFG_SUPERSPEED
)) {
2298 reg
= dwc3_readl(dwc
->regs
, DWC3_DCFG
);
2299 reg
|= DWC3_DCFG_LPM_CAP
;
2300 dwc3_writel(dwc
->regs
, DWC3_DCFG
, reg
);
2302 reg
= dwc3_readl(dwc
->regs
, DWC3_DCTL
);
2303 reg
&= ~(DWC3_DCTL_HIRD_THRES_MASK
| DWC3_DCTL_L1_HIBER_EN
);
2306 * TODO: This should be configurable. For now using
2307 * maximum allowed HIRD threshold value of 0b1100
2309 reg
|= DWC3_DCTL_HIRD_THRES(12);
2311 dwc3_writel(dwc
->regs
, DWC3_DCTL
, reg
);
2314 /* Recent versions support automatic phy suspend and don't need this */
2315 if (dwc
->revision
< DWC3_REVISION_194A
) {
2316 /* Suspend unneeded PHY */
2317 dwc3_gadget_phy_suspend(dwc
, dwc
->gadget
.speed
);
2321 ret
= __dwc3_gadget_ep_enable(dep
, &dwc3_gadget_ep0_desc
, NULL
, true);
2323 dev_err(dwc
->dev
, "failed to enable %s\n", dep
->name
);
2328 ret
= __dwc3_gadget_ep_enable(dep
, &dwc3_gadget_ep0_desc
, NULL
, true);
2330 dev_err(dwc
->dev
, "failed to enable %s\n", dep
->name
);
2335 * Configure PHY via GUSB3PIPECTLn if required.
2337 * Update GTXFIFOSIZn
2339 * In both cases reset values should be sufficient.
2343 static void dwc3_gadget_wakeup_interrupt(struct dwc3
*dwc
)
2345 dev_vdbg(dwc
->dev
, "%s\n", __func__
);
2348 * TODO take core out of low power mode when that's
2352 dwc
->gadget_driver
->resume(&dwc
->gadget
);
2355 static void dwc3_gadget_linksts_change_interrupt(struct dwc3
*dwc
,
2356 unsigned int evtinfo
)
2358 enum dwc3_link_state next
= evtinfo
& DWC3_LINK_STATE_MASK
;
2359 unsigned int pwropt
;
2362 * WORKAROUND: DWC3 < 2.50a have an issue when configured without
2363 * Hibernation mode enabled which would show up when device detects
2364 * host-initiated U3 exit.
2366 * In that case, device will generate a Link State Change Interrupt
2367 * from U3 to RESUME which is only necessary if Hibernation is
2370 * There are no functional changes due to such spurious event and we
2371 * just need to ignore it.
2375 * STAR#9000570034 RTL: SS Resume event generated in non-Hibernation
2378 pwropt
= DWC3_GHWPARAMS1_EN_PWROPT(dwc
->hwparams
.hwparams1
);
2379 if ((dwc
->revision
< DWC3_REVISION_250A
) &&
2380 (pwropt
!= DWC3_GHWPARAMS1_EN_PWROPT_HIB
)) {
2381 if ((dwc
->link_state
== DWC3_LINK_STATE_U3
) &&
2382 (next
== DWC3_LINK_STATE_RESUME
)) {
2383 dev_vdbg(dwc
->dev
, "ignoring transition U3 -> Resume\n");
2389 * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
2390 * on the link partner, the USB session might do multiple entry/exit
2391 * of low power states before a transfer takes place.
2393 * Due to this problem, we might experience lower throughput. The
2394 * suggested workaround is to disable DCTL[12:9] bits if we're
2395 * transitioning from U1/U2 to U0 and enable those bits again
2396 * after a transfer completes and there are no pending transfers
2397 * on any of the enabled endpoints.
2399 * This is the first half of that workaround.
2403 * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
2404 * core send LGO_Ux entering U0
2406 if (dwc
->revision
< DWC3_REVISION_183A
) {
2407 if (next
== DWC3_LINK_STATE_U0
) {
2411 switch (dwc
->link_state
) {
2412 case DWC3_LINK_STATE_U1
:
2413 case DWC3_LINK_STATE_U2
:
2414 reg
= dwc3_readl(dwc
->regs
, DWC3_DCTL
);
2415 u1u2
= reg
& (DWC3_DCTL_INITU2ENA
2416 | DWC3_DCTL_ACCEPTU2ENA
2417 | DWC3_DCTL_INITU1ENA
2418 | DWC3_DCTL_ACCEPTU1ENA
);
2421 dwc
->u1u2
= reg
& u1u2
;
2425 dwc3_writel(dwc
->regs
, DWC3_DCTL
, reg
);
2434 dwc
->link_state
= next
;
2436 dev_vdbg(dwc
->dev
, "%s link %d\n", __func__
, dwc
->link_state
);
2439 static void dwc3_gadget_interrupt(struct dwc3
*dwc
,
2440 const struct dwc3_event_devt
*event
)
2442 switch (event
->type
) {
2443 case DWC3_DEVICE_EVENT_DISCONNECT
:
2444 dwc3_gadget_disconnect_interrupt(dwc
);
2446 case DWC3_DEVICE_EVENT_RESET
:
2447 dwc3_gadget_reset_interrupt(dwc
);
2449 case DWC3_DEVICE_EVENT_CONNECT_DONE
:
2450 dwc3_gadget_conndone_interrupt(dwc
);
2452 case DWC3_DEVICE_EVENT_WAKEUP
:
2453 dwc3_gadget_wakeup_interrupt(dwc
);
2455 case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE
:
2456 dwc3_gadget_linksts_change_interrupt(dwc
, event
->event_info
);
2458 case DWC3_DEVICE_EVENT_EOPF
:
2459 dev_vdbg(dwc
->dev
, "End of Periodic Frame\n");
2461 case DWC3_DEVICE_EVENT_SOF
:
2462 dev_vdbg(dwc
->dev
, "Start of Periodic Frame\n");
2464 case DWC3_DEVICE_EVENT_ERRATIC_ERROR
:
2465 dev_vdbg(dwc
->dev
, "Erratic Error\n");
2467 case DWC3_DEVICE_EVENT_CMD_CMPL
:
2468 dev_vdbg(dwc
->dev
, "Command Complete\n");
2470 case DWC3_DEVICE_EVENT_OVERFLOW
:
2471 dev_vdbg(dwc
->dev
, "Overflow\n");
2474 dev_dbg(dwc
->dev
, "UNKNOWN IRQ %d\n", event
->type
);
2478 static void dwc3_process_event_entry(struct dwc3
*dwc
,
2479 const union dwc3_event
*event
)
2481 /* Endpoint IRQ, handle it and return early */
2482 if (event
->type
.is_devspec
== 0) {
2484 return dwc3_endpoint_interrupt(dwc
, &event
->depevt
);
2487 switch (event
->type
.type
) {
2488 case DWC3_EVENT_TYPE_DEV
:
2489 dwc3_gadget_interrupt(dwc
, &event
->devt
);
2491 /* REVISIT what to do with Carkit and I2C events ? */
2493 dev_err(dwc
->dev
, "UNKNOWN IRQ type %d\n", event
->raw
);
2497 static irqreturn_t
dwc3_thread_interrupt(int irq
, void *_dwc
)
2499 struct dwc3
*dwc
= _dwc
;
2500 unsigned long flags
;
2501 irqreturn_t ret
= IRQ_NONE
;
2504 spin_lock_irqsave(&dwc
->lock
, flags
);
2506 for (i
= 0; i
< dwc
->num_event_buffers
; i
++) {
2507 struct dwc3_event_buffer
*evt
;
2510 evt
= dwc
->ev_buffs
[i
];
2513 if (!(evt
->flags
& DWC3_EVENT_PENDING
))
2517 union dwc3_event event
;
2519 event
.raw
= *(u32
*) (evt
->buf
+ evt
->lpos
);
2521 dwc3_process_event_entry(dwc
, &event
);
2524 * FIXME we wrap around correctly to the next entry as
2525 * almost all entries are 4 bytes in size. There is one
2526 * entry which has 12 bytes which is a regular entry
2527 * followed by 8 bytes data. ATM I don't know how
2528 * things are organized if we get next to the a
2529 * boundary so I worry about that once we try to handle
2532 evt
->lpos
= (evt
->lpos
+ 4) % DWC3_EVENT_BUFFERS_SIZE
;
2535 dwc3_writel(dwc
->regs
, DWC3_GEVNTCOUNT(i
), 4);
2539 evt
->flags
&= ~DWC3_EVENT_PENDING
;
2543 spin_unlock_irqrestore(&dwc
->lock
, flags
);
2548 static irqreturn_t
dwc3_process_event_buf(struct dwc3
*dwc
, u32 buf
)
2550 struct dwc3_event_buffer
*evt
;
2553 evt
= dwc
->ev_buffs
[buf
];
2555 count
= dwc3_readl(dwc
->regs
, DWC3_GEVNTCOUNT(buf
));
2556 count
&= DWC3_GEVNTCOUNT_MASK
;
2561 evt
->flags
|= DWC3_EVENT_PENDING
;
2563 return IRQ_WAKE_THREAD
;
2566 static irqreturn_t
dwc3_interrupt(int irq
, void *_dwc
)
2568 struct dwc3
*dwc
= _dwc
;
2570 irqreturn_t ret
= IRQ_NONE
;
2572 spin_lock(&dwc
->lock
);
2574 for (i
= 0; i
< dwc
->num_event_buffers
; i
++) {
2577 status
= dwc3_process_event_buf(dwc
, i
);
2578 if (status
== IRQ_WAKE_THREAD
)
2582 spin_unlock(&dwc
->lock
);
2588 * dwc3_gadget_init - Initializes gadget related registers
2589 * @dwc: pointer to our controller context structure
2591 * Returns 0 on success otherwise negative errno.
2593 int dwc3_gadget_init(struct dwc3
*dwc
)
2598 dwc
->ctrl_req
= dma_alloc_coherent(dwc
->dev
, sizeof(*dwc
->ctrl_req
),
2599 &dwc
->ctrl_req_addr
, GFP_KERNEL
);
2600 if (!dwc
->ctrl_req
) {
2601 dev_err(dwc
->dev
, "failed to allocate ctrl request\n");
2606 dwc
->ep0_trb
= dma_alloc_coherent(dwc
->dev
, sizeof(*dwc
->ep0_trb
),
2607 &dwc
->ep0_trb_addr
, GFP_KERNEL
);
2608 if (!dwc
->ep0_trb
) {
2609 dev_err(dwc
->dev
, "failed to allocate ep0 trb\n");
2614 dwc
->setup_buf
= kzalloc(DWC3_EP0_BOUNCE_SIZE
, GFP_KERNEL
);
2615 if (!dwc
->setup_buf
) {
2616 dev_err(dwc
->dev
, "failed to allocate setup buffer\n");
2621 dwc
->ep0_bounce
= dma_alloc_coherent(dwc
->dev
,
2622 DWC3_EP0_BOUNCE_SIZE
, &dwc
->ep0_bounce_addr
,
2624 if (!dwc
->ep0_bounce
) {
2625 dev_err(dwc
->dev
, "failed to allocate ep0 bounce buffer\n");
2630 dwc
->gadget
.ops
= &dwc3_gadget_ops
;
2631 dwc
->gadget
.max_speed
= USB_SPEED_SUPER
;
2632 dwc
->gadget
.speed
= USB_SPEED_UNKNOWN
;
2633 dwc
->gadget
.sg_supported
= true;
2634 dwc
->gadget
.name
= "dwc3-gadget";
2637 * REVISIT: Here we should clear all pending IRQs to be
2638 * sure we're starting from a well known location.
2641 ret
= dwc3_gadget_init_endpoints(dwc
);
2645 reg
= dwc3_readl(dwc
->regs
, DWC3_DCFG
);
2646 reg
|= DWC3_DCFG_LPM_CAP
;
2647 dwc3_writel(dwc
->regs
, DWC3_DCFG
, reg
);
2649 /* Enable USB2 LPM and automatic phy suspend only on recent versions */
2650 if (dwc
->revision
>= DWC3_REVISION_194A
) {
2651 dwc3_gadget_usb2_phy_suspend(dwc
, false);
2652 dwc3_gadget_usb3_phy_suspend(dwc
, false);
2655 ret
= usb_add_gadget_udc(dwc
->dev
, &dwc
->gadget
);
2657 dev_err(dwc
->dev
, "failed to register udc\n");
2664 dwc3_gadget_free_endpoints(dwc
);
2667 dma_free_coherent(dwc
->dev
, DWC3_EP0_BOUNCE_SIZE
,
2668 dwc
->ep0_bounce
, dwc
->ep0_bounce_addr
);
2671 kfree(dwc
->setup_buf
);
2674 dma_free_coherent(dwc
->dev
, sizeof(*dwc
->ep0_trb
),
2675 dwc
->ep0_trb
, dwc
->ep0_trb_addr
);
2678 dma_free_coherent(dwc
->dev
, sizeof(*dwc
->ctrl_req
),
2679 dwc
->ctrl_req
, dwc
->ctrl_req_addr
);
2685 /* -------------------------------------------------------------------------- */
2687 void dwc3_gadget_exit(struct dwc3
*dwc
)
2689 usb_del_gadget_udc(&dwc
->gadget
);
2691 dwc3_gadget_free_endpoints(dwc
);
2693 dma_free_coherent(dwc
->dev
, DWC3_EP0_BOUNCE_SIZE
,
2694 dwc
->ep0_bounce
, dwc
->ep0_bounce_addr
);
2696 kfree(dwc
->setup_buf
);
2698 dma_free_coherent(dwc
->dev
, sizeof(*dwc
->ep0_trb
),
2699 dwc
->ep0_trb
, dwc
->ep0_trb_addr
);
2701 dma_free_coherent(dwc
->dev
, sizeof(*dwc
->ctrl_req
),
2702 dwc
->ctrl_req
, dwc
->ctrl_req_addr
);
2705 int dwc3_gadget_prepare(struct dwc3
*dwc
)
2707 if (dwc
->pullups_connected
)
2708 dwc3_gadget_disable_irq(dwc
);
2713 void dwc3_gadget_complete(struct dwc3
*dwc
)
2715 if (dwc
->pullups_connected
) {
2716 dwc3_gadget_enable_irq(dwc
);
2717 dwc3_gadget_run_stop(dwc
, true);
2721 int dwc3_gadget_suspend(struct dwc3
*dwc
)
2723 __dwc3_gadget_ep_disable(dwc
->eps
[0]);
2724 __dwc3_gadget_ep_disable(dwc
->eps
[1]);
2726 dwc
->dcfg
= dwc3_readl(dwc
->regs
, DWC3_DCFG
);
2731 int dwc3_gadget_resume(struct dwc3
*dwc
)
2733 struct dwc3_ep
*dep
;
2736 /* Start with SuperSpeed Default */
2737 dwc3_gadget_ep0_desc
.wMaxPacketSize
= cpu_to_le16(512);
2740 ret
= __dwc3_gadget_ep_enable(dep
, &dwc3_gadget_ep0_desc
, NULL
, false);
2745 ret
= __dwc3_gadget_ep_enable(dep
, &dwc3_gadget_ep0_desc
, NULL
, false);
2749 /* begin to receive SETUP packets */
2750 dwc
->ep0state
= EP0_SETUP_PHASE
;
2751 dwc3_ep0_out_start(dwc
);
2753 dwc3_writel(dwc
->regs
, DWC3_DCFG
, dwc
->dcfg
);
2758 __dwc3_gadget_ep_disable(dwc
->eps
[0]);