Commit | Line | Data |
---|---|---|
550a7375 FB |
1 | /* |
2 | * MUSB OTG driver host support | |
3 | * | |
4 | * Copyright 2005 Mentor Graphics Corporation | |
5 | * Copyright (C) 2005-2006 by Texas Instruments | |
6 | * Copyright (C) 2006-2007 Nokia Corporation | |
c7bbc056 | 7 | * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com> |
550a7375 FB |
8 | * |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * version 2 as published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
21 | * 02110-1301 USA | |
22 | * | |
23 | * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED | |
24 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN | |
26 | * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, | |
27 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
28 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF | |
29 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | |
30 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
31 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
32 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
33 | * | |
34 | */ | |
35 | ||
36 | #include <linux/module.h> | |
37 | #include <linux/kernel.h> | |
38 | #include <linux/delay.h> | |
39 | #include <linux/sched.h> | |
40 | #include <linux/slab.h> | |
41 | #include <linux/errno.h> | |
550a7375 | 42 | #include <linux/list.h> |
496dda70 | 43 | #include <linux/dma-mapping.h> |
550a7375 FB |
44 | |
45 | #include "musb_core.h" | |
46 | #include "musb_host.h" | |
47 | ||
550a7375 FB |
48 | /* MUSB HOST status 22-mar-2006 |
49 | * | |
50 | * - There's still lots of partial code duplication for fault paths, so | |
51 | * they aren't handled as consistently as they need to be. | |
52 | * | |
53 | * - PIO mostly behaved when last tested. | |
54 | * + including ep0, with all usbtest cases 9, 10 | |
55 | * + usbtest 14 (ep0out) doesn't seem to run at all | |
56 | * + double buffered OUT/TX endpoints saw stalls(!) with certain usbtest | |
57 | * configurations, but otherwise double buffering passes basic tests. | |
58 | * + for 2.6.N, for N > ~10, needs API changes for hcd framework. | |
59 | * | |
60 | * - DMA (CPPI) ... partially behaves, not currently recommended | |
61 | * + about 1/15 the speed of typical EHCI implementations (PCI) | |
62 | * + RX, all too often reqpkt seems to misbehave after tx | |
63 | * + TX, no known issues (other than evident silicon issue) | |
64 | * | |
65 | * - DMA (Mentor/OMAP) ...has at least toggle update problems | |
66 | * | |
1e0320f0 AKG |
67 | * - [23-feb-2009] minimal traffic scheduling to avoid bulk RX packet |
68 | * starvation ... nothing yet for TX, interrupt, or bulk. | |
550a7375 FB |
69 | * |
70 | * - Not tested with HNP, but some SRP paths seem to behave. | |
71 | * | |
72 | * NOTE 24-August-2006: | |
73 | * | |
74 | * - Bulk traffic finally uses both sides of hardware ep1, freeing up an | |
75 | * extra endpoint for periodic use enabling hub + keybd + mouse. That | |
76 | * mostly works, except that with "usbnet" it's easy to trigger cases | |
77 | * with "ping" where RX loses. (a) ping to davinci, even "ping -f", | |
78 | * fine; but (b) ping _from_ davinci, even "ping -c 1", ICMP RX loses | |
79 | * although ARP RX wins. (That test was done with a full speed link.) | |
80 | */ | |
81 | ||
82 | ||
83 | /* | |
84 | * NOTE on endpoint usage: | |
85 | * | |
86 | * CONTROL transfers all go through ep0. BULK ones go through dedicated IN | |
87 | * and OUT endpoints ... hardware is dedicated for those "async" queue(s). | |
550a7375 | 88 | * (Yes, bulk _could_ use more of the endpoints than that, and would even |
1e0320f0 | 89 | * benefit from it.) |
550a7375 FB |
90 | * |
91 | * INTERUPPT and ISOCHRONOUS transfers are scheduled to the other endpoints. | |
92 | * So far that scheduling is both dumb and optimistic: the endpoint will be | |
93 | * "claimed" until its software queue is no longer refilled. No multiplexing | |
94 | * of transfers between endpoints, or anything clever. | |
95 | */ | |
96 | ||
74c2e936 DM |
97 | struct musb *hcd_to_musb(struct usb_hcd *hcd) |
98 | { | |
99 | return *(struct musb **) hcd->hcd_priv; | |
100 | } | |
101 | ||
550a7375 FB |
102 | |
103 | static void musb_ep_program(struct musb *musb, u8 epnum, | |
6b6e9710 SS |
104 | struct urb *urb, int is_out, |
105 | u8 *buf, u32 offset, u32 len); | |
550a7375 FB |
106 | |
107 | /* | |
108 | * Clear TX fifo. Needed to avoid BABBLE errors. | |
109 | */ | |
c767c1c6 | 110 | static void musb_h_tx_flush_fifo(struct musb_hw_ep *ep) |
550a7375 | 111 | { |
5c8a86e1 | 112 | struct musb *musb = ep->musb; |
550a7375 FB |
113 | void __iomem *epio = ep->regs; |
114 | u16 csr; | |
bb1c9ef1 | 115 | u16 lastcsr = 0; |
550a7375 FB |
116 | int retries = 1000; |
117 | ||
118 | csr = musb_readw(epio, MUSB_TXCSR); | |
119 | while (csr & MUSB_TXCSR_FIFONOTEMPTY) { | |
bb1c9ef1 | 120 | if (csr != lastcsr) |
5c8a86e1 | 121 | dev_dbg(musb->controller, "Host TX FIFONOTEMPTY csr: %02x\n", csr); |
bb1c9ef1 | 122 | lastcsr = csr; |
550a7375 FB |
123 | csr |= MUSB_TXCSR_FLUSHFIFO; |
124 | musb_writew(epio, MUSB_TXCSR, csr); | |
125 | csr = musb_readw(epio, MUSB_TXCSR); | |
bb1c9ef1 DB |
126 | if (WARN(retries-- < 1, |
127 | "Could not flush host TX%d fifo: csr: %04x\n", | |
128 | ep->epnum, csr)) | |
550a7375 | 129 | return; |
550a7375 FB |
130 | mdelay(1); |
131 | } | |
132 | } | |
133 | ||
78322c1a DB |
134 | static void musb_h_ep0_flush_fifo(struct musb_hw_ep *ep) |
135 | { | |
136 | void __iomem *epio = ep->regs; | |
137 | u16 csr; | |
138 | int retries = 5; | |
139 | ||
140 | /* scrub any data left in the fifo */ | |
141 | do { | |
142 | csr = musb_readw(epio, MUSB_TXCSR); | |
143 | if (!(csr & (MUSB_CSR0_TXPKTRDY | MUSB_CSR0_RXPKTRDY))) | |
144 | break; | |
145 | musb_writew(epio, MUSB_TXCSR, MUSB_CSR0_FLUSHFIFO); | |
146 | csr = musb_readw(epio, MUSB_TXCSR); | |
147 | udelay(10); | |
148 | } while (--retries); | |
149 | ||
150 | WARN(!retries, "Could not flush host TX%d fifo: csr: %04x\n", | |
151 | ep->epnum, csr); | |
152 | ||
153 | /* and reset for the next transfer */ | |
154 | musb_writew(epio, MUSB_TXCSR, 0); | |
155 | } | |
156 | ||
550a7375 FB |
157 | /* |
158 | * Start transmit. Caller is responsible for locking shared resources. | |
159 | * musb must be locked. | |
160 | */ | |
161 | static inline void musb_h_tx_start(struct musb_hw_ep *ep) | |
162 | { | |
163 | u16 txcsr; | |
164 | ||
165 | /* NOTE: no locks here; caller should lock and select EP */ | |
166 | if (ep->epnum) { | |
167 | txcsr = musb_readw(ep->regs, MUSB_TXCSR); | |
168 | txcsr |= MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_H_WZC_BITS; | |
169 | musb_writew(ep->regs, MUSB_TXCSR, txcsr); | |
170 | } else { | |
171 | txcsr = MUSB_CSR0_H_SETUPPKT | MUSB_CSR0_TXPKTRDY; | |
172 | musb_writew(ep->regs, MUSB_CSR0, txcsr); | |
173 | } | |
174 | ||
175 | } | |
176 | ||
c7bbc056 | 177 | static inline void musb_h_tx_dma_start(struct musb_hw_ep *ep) |
550a7375 FB |
178 | { |
179 | u16 txcsr; | |
180 | ||
181 | /* NOTE: no locks here; caller should lock and select EP */ | |
182 | txcsr = musb_readw(ep->regs, MUSB_TXCSR); | |
183 | txcsr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_H_WZC_BITS; | |
c7bbc056 SS |
184 | if (is_cppi_enabled()) |
185 | txcsr |= MUSB_TXCSR_DMAMODE; | |
550a7375 FB |
186 | musb_writew(ep->regs, MUSB_TXCSR, txcsr); |
187 | } | |
188 | ||
3e5c6dc7 SS |
189 | static void musb_ep_set_qh(struct musb_hw_ep *ep, int is_in, struct musb_qh *qh) |
190 | { | |
191 | if (is_in != 0 || ep->is_shared_fifo) | |
192 | ep->in_qh = qh; | |
193 | if (is_in == 0 || ep->is_shared_fifo) | |
194 | ep->out_qh = qh; | |
195 | } | |
196 | ||
197 | static struct musb_qh *musb_ep_get_qh(struct musb_hw_ep *ep, int is_in) | |
198 | { | |
199 | return is_in ? ep->in_qh : ep->out_qh; | |
200 | } | |
201 | ||
550a7375 FB |
202 | /* |
203 | * Start the URB at the front of an endpoint's queue | |
204 | * end must be claimed from the caller. | |
205 | * | |
206 | * Context: controller locked, irqs blocked | |
207 | */ | |
208 | static void | |
209 | musb_start_urb(struct musb *musb, int is_in, struct musb_qh *qh) | |
210 | { | |
211 | u16 frame; | |
212 | u32 len; | |
550a7375 FB |
213 | void __iomem *mbase = musb->mregs; |
214 | struct urb *urb = next_urb(qh); | |
6b6e9710 SS |
215 | void *buf = urb->transfer_buffer; |
216 | u32 offset = 0; | |
550a7375 FB |
217 | struct musb_hw_ep *hw_ep = qh->hw_ep; |
218 | unsigned pipe = urb->pipe; | |
219 | u8 address = usb_pipedevice(pipe); | |
220 | int epnum = hw_ep->epnum; | |
221 | ||
222 | /* initialize software qh state */ | |
223 | qh->offset = 0; | |
224 | qh->segsize = 0; | |
225 | ||
226 | /* gather right source of data */ | |
227 | switch (qh->type) { | |
228 | case USB_ENDPOINT_XFER_CONTROL: | |
229 | /* control transfers always start with SETUP */ | |
230 | is_in = 0; | |
550a7375 FB |
231 | musb->ep0_stage = MUSB_EP0_START; |
232 | buf = urb->setup_packet; | |
233 | len = 8; | |
234 | break; | |
235 | case USB_ENDPOINT_XFER_ISOC: | |
236 | qh->iso_idx = 0; | |
237 | qh->frame = 0; | |
6b6e9710 | 238 | offset = urb->iso_frame_desc[0].offset; |
550a7375 FB |
239 | len = urb->iso_frame_desc[0].length; |
240 | break; | |
241 | default: /* bulk, interrupt */ | |
1e0320f0 AKG |
242 | /* actual_length may be nonzero on retry paths */ |
243 | buf = urb->transfer_buffer + urb->actual_length; | |
244 | len = urb->transfer_buffer_length - urb->actual_length; | |
550a7375 FB |
245 | } |
246 | ||
5c8a86e1 | 247 | dev_dbg(musb->controller, "qh %p urb %p dev%d ep%d%s%s, hw_ep %d, %p/%d\n", |
550a7375 FB |
248 | qh, urb, address, qh->epnum, |
249 | is_in ? "in" : "out", | |
250 | ({char *s; switch (qh->type) { | |
251 | case USB_ENDPOINT_XFER_CONTROL: s = ""; break; | |
252 | case USB_ENDPOINT_XFER_BULK: s = "-bulk"; break; | |
253 | case USB_ENDPOINT_XFER_ISOC: s = "-iso"; break; | |
254 | default: s = "-intr"; break; | |
2b84f92b | 255 | } s; }), |
6b6e9710 | 256 | epnum, buf + offset, len); |
550a7375 FB |
257 | |
258 | /* Configure endpoint */ | |
3e5c6dc7 | 259 | musb_ep_set_qh(hw_ep, is_in, qh); |
6b6e9710 | 260 | musb_ep_program(musb, epnum, urb, !is_in, buf, offset, len); |
550a7375 FB |
261 | |
262 | /* transmit may have more work: start it when it is time */ | |
263 | if (is_in) | |
264 | return; | |
265 | ||
266 | /* determine if the time is right for a periodic transfer */ | |
267 | switch (qh->type) { | |
268 | case USB_ENDPOINT_XFER_ISOC: | |
269 | case USB_ENDPOINT_XFER_INT: | |
5c8a86e1 | 270 | dev_dbg(musb->controller, "check whether there's still time for periodic Tx\n"); |
550a7375 FB |
271 | frame = musb_readw(mbase, MUSB_FRAME); |
272 | /* FIXME this doesn't implement that scheduling policy ... | |
273 | * or handle framecounter wrapping | |
274 | */ | |
8a1ea51f | 275 | if (1) { /* Always assume URB_ISO_ASAP */ |
550a7375 FB |
276 | /* REVISIT the SOF irq handler shouldn't duplicate |
277 | * this code; and we don't init urb->start_frame... | |
278 | */ | |
279 | qh->frame = 0; | |
280 | goto start; | |
281 | } else { | |
282 | qh->frame = urb->start_frame; | |
283 | /* enable SOF interrupt so we can count down */ | |
5c8a86e1 | 284 | dev_dbg(musb->controller, "SOF for %d\n", epnum); |
550a7375 FB |
285 | #if 1 /* ifndef CONFIG_ARCH_DAVINCI */ |
286 | musb_writeb(mbase, MUSB_INTRUSBE, 0xff); | |
287 | #endif | |
288 | } | |
289 | break; | |
290 | default: | |
291 | start: | |
5c8a86e1 | 292 | dev_dbg(musb->controller, "Start TX%d %s\n", epnum, |
550a7375 FB |
293 | hw_ep->tx_channel ? "dma" : "pio"); |
294 | ||
295 | if (!hw_ep->tx_channel) | |
296 | musb_h_tx_start(hw_ep); | |
297 | else if (is_cppi_enabled() || tusb_dma_omap()) | |
c7bbc056 | 298 | musb_h_tx_dma_start(hw_ep); |
550a7375 FB |
299 | } |
300 | } | |
301 | ||
c9cd06b3 SS |
302 | /* Context: caller owns controller lock, IRQs are blocked */ |
303 | static void musb_giveback(struct musb *musb, struct urb *urb, int status) | |
550a7375 FB |
304 | __releases(musb->lock) |
305 | __acquires(musb->lock) | |
306 | { | |
5c8a86e1 | 307 | dev_dbg(musb->controller, |
bb1c9ef1 DB |
308 | "complete %p %pF (%d), dev%d ep%d%s, %d/%d\n", |
309 | urb, urb->complete, status, | |
550a7375 FB |
310 | usb_pipedevice(urb->pipe), |
311 | usb_pipeendpoint(urb->pipe), | |
312 | usb_pipein(urb->pipe) ? "in" : "out", | |
313 | urb->actual_length, urb->transfer_buffer_length | |
314 | ); | |
315 | ||
8b125df5 | 316 | usb_hcd_unlink_urb_from_ep(musb->hcd, urb); |
550a7375 | 317 | spin_unlock(&musb->lock); |
8b125df5 | 318 | usb_hcd_giveback_urb(musb->hcd, urb, status); |
550a7375 FB |
319 | spin_lock(&musb->lock); |
320 | } | |
321 | ||
846099a6 SS |
322 | /* For bulk/interrupt endpoints only */ |
323 | static inline void musb_save_toggle(struct musb_qh *qh, int is_in, | |
324 | struct urb *urb) | |
550a7375 | 325 | { |
846099a6 | 326 | void __iomem *epio = qh->hw_ep->regs; |
550a7375 | 327 | u16 csr; |
550a7375 | 328 | |
846099a6 SS |
329 | /* |
330 | * FIXME: the current Mentor DMA code seems to have | |
550a7375 FB |
331 | * problems getting toggle correct. |
332 | */ | |
333 | ||
846099a6 SS |
334 | if (is_in) |
335 | csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE; | |
550a7375 | 336 | else |
846099a6 | 337 | csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE; |
550a7375 | 338 | |
846099a6 | 339 | usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0); |
550a7375 FB |
340 | } |
341 | ||
c9cd06b3 SS |
342 | /* |
343 | * Advance this hardware endpoint's queue, completing the specified URB and | |
344 | * advancing to either the next URB queued to that qh, or else invalidating | |
345 | * that qh and advancing to the next qh scheduled after the current one. | |
346 | * | |
347 | * Context: caller owns controller lock, IRQs are blocked | |
348 | */ | |
349 | static void musb_advance_schedule(struct musb *musb, struct urb *urb, | |
350 | struct musb_hw_ep *hw_ep, int is_in) | |
550a7375 | 351 | { |
c9cd06b3 | 352 | struct musb_qh *qh = musb_ep_get_qh(hw_ep, is_in); |
550a7375 | 353 | struct musb_hw_ep *ep = qh->hw_ep; |
550a7375 | 354 | int ready = qh->is_ready; |
c9cd06b3 SS |
355 | int status; |
356 | ||
357 | status = (urb->status == -EINPROGRESS) ? 0 : urb->status; | |
550a7375 | 358 | |
550a7375 FB |
359 | /* save toggle eagerly, for paranoia */ |
360 | switch (qh->type) { | |
361 | case USB_ENDPOINT_XFER_BULK: | |
362 | case USB_ENDPOINT_XFER_INT: | |
846099a6 | 363 | musb_save_toggle(qh, is_in, urb); |
550a7375 FB |
364 | break; |
365 | case USB_ENDPOINT_XFER_ISOC: | |
1fe975f9 | 366 | if (status == 0 && urb->error_count) |
550a7375 FB |
367 | status = -EXDEV; |
368 | break; | |
369 | } | |
370 | ||
550a7375 | 371 | qh->is_ready = 0; |
c9cd06b3 | 372 | musb_giveback(musb, urb, status); |
550a7375 FB |
373 | qh->is_ready = ready; |
374 | ||
375 | /* reclaim resources (and bandwidth) ASAP; deschedule it, and | |
376 | * invalidate qh as soon as list_empty(&hep->urb_list) | |
377 | */ | |
378 | if (list_empty(&qh->hep->urb_list)) { | |
379 | struct list_head *head; | |
8c778db9 | 380 | struct dma_controller *dma = musb->dma_controller; |
550a7375 | 381 | |
8c778db9 | 382 | if (is_in) { |
550a7375 | 383 | ep->rx_reinit = 1; |
8c778db9 AKG |
384 | if (ep->rx_channel) { |
385 | dma->channel_release(ep->rx_channel); | |
386 | ep->rx_channel = NULL; | |
387 | } | |
388 | } else { | |
550a7375 | 389 | ep->tx_reinit = 1; |
8c778db9 AKG |
390 | if (ep->tx_channel) { |
391 | dma->channel_release(ep->tx_channel); | |
392 | ep->tx_channel = NULL; | |
393 | } | |
394 | } | |
550a7375 | 395 | |
3e5c6dc7 SS |
396 | /* Clobber old pointers to this qh */ |
397 | musb_ep_set_qh(ep, is_in, NULL); | |
550a7375 FB |
398 | qh->hep->hcpriv = NULL; |
399 | ||
400 | switch (qh->type) { | |
401 | ||
23d15e07 AKG |
402 | case USB_ENDPOINT_XFER_CONTROL: |
403 | case USB_ENDPOINT_XFER_BULK: | |
404 | /* fifo policy for these lists, except that NAKing | |
405 | * should rotate a qh to the end (for fairness). | |
406 | */ | |
407 | if (qh->mux == 1) { | |
408 | head = qh->ring.prev; | |
409 | list_del(&qh->ring); | |
410 | kfree(qh); | |
411 | qh = first_qh(head); | |
412 | break; | |
413 | } | |
414 | ||
550a7375 FB |
415 | case USB_ENDPOINT_XFER_ISOC: |
416 | case USB_ENDPOINT_XFER_INT: | |
417 | /* this is where periodic bandwidth should be | |
418 | * de-allocated if it's tracked and allocated; | |
419 | * and where we'd update the schedule tree... | |
420 | */ | |
550a7375 FB |
421 | kfree(qh); |
422 | qh = NULL; | |
423 | break; | |
550a7375 FB |
424 | } |
425 | } | |
550a7375 | 426 | |
a2fd814e | 427 | if (qh != NULL && qh->is_ready) { |
5c8a86e1 | 428 | dev_dbg(musb->controller, "... next ep%d %cX urb %p\n", |
c9cd06b3 | 429 | hw_ep->epnum, is_in ? 'R' : 'T', next_urb(qh)); |
550a7375 FB |
430 | musb_start_urb(musb, is_in, qh); |
431 | } | |
432 | } | |
433 | ||
c767c1c6 | 434 | static u16 musb_h_flush_rxfifo(struct musb_hw_ep *hw_ep, u16 csr) |
550a7375 FB |
435 | { |
436 | /* we don't want fifo to fill itself again; | |
437 | * ignore dma (various models), | |
438 | * leave toggle alone (may not have been saved yet) | |
439 | */ | |
440 | csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_RXPKTRDY; | |
441 | csr &= ~(MUSB_RXCSR_H_REQPKT | |
442 | | MUSB_RXCSR_H_AUTOREQ | |
443 | | MUSB_RXCSR_AUTOCLEAR); | |
444 | ||
445 | /* write 2x to allow double buffering */ | |
446 | musb_writew(hw_ep->regs, MUSB_RXCSR, csr); | |
447 | musb_writew(hw_ep->regs, MUSB_RXCSR, csr); | |
448 | ||
449 | /* flush writebuffer */ | |
450 | return musb_readw(hw_ep->regs, MUSB_RXCSR); | |
451 | } | |
452 | ||
453 | /* | |
454 | * PIO RX for a packet (or part of it). | |
455 | */ | |
456 | static bool | |
457 | musb_host_packet_rx(struct musb *musb, struct urb *urb, u8 epnum, u8 iso_err) | |
458 | { | |
459 | u16 rx_count; | |
460 | u8 *buf; | |
461 | u16 csr; | |
462 | bool done = false; | |
463 | u32 length; | |
464 | int do_flush = 0; | |
465 | struct musb_hw_ep *hw_ep = musb->endpoints + epnum; | |
466 | void __iomem *epio = hw_ep->regs; | |
467 | struct musb_qh *qh = hw_ep->in_qh; | |
468 | int pipe = urb->pipe; | |
469 | void *buffer = urb->transfer_buffer; | |
470 | ||
471 | /* musb_ep_select(mbase, epnum); */ | |
472 | rx_count = musb_readw(epio, MUSB_RXCOUNT); | |
5c8a86e1 | 473 | dev_dbg(musb->controller, "RX%d count %d, buffer %p len %d/%d\n", epnum, rx_count, |
550a7375 FB |
474 | urb->transfer_buffer, qh->offset, |
475 | urb->transfer_buffer_length); | |
476 | ||
477 | /* unload FIFO */ | |
478 | if (usb_pipeisoc(pipe)) { | |
479 | int status = 0; | |
480 | struct usb_iso_packet_descriptor *d; | |
481 | ||
482 | if (iso_err) { | |
483 | status = -EILSEQ; | |
484 | urb->error_count++; | |
485 | } | |
486 | ||
487 | d = urb->iso_frame_desc + qh->iso_idx; | |
488 | buf = buffer + d->offset; | |
489 | length = d->length; | |
490 | if (rx_count > length) { | |
491 | if (status == 0) { | |
492 | status = -EOVERFLOW; | |
493 | urb->error_count++; | |
494 | } | |
5c8a86e1 | 495 | dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length); |
550a7375 FB |
496 | do_flush = 1; |
497 | } else | |
498 | length = rx_count; | |
499 | urb->actual_length += length; | |
500 | d->actual_length = length; | |
501 | ||
502 | d->status = status; | |
503 | ||
504 | /* see if we are done */ | |
505 | done = (++qh->iso_idx >= urb->number_of_packets); | |
506 | } else { | |
507 | /* non-isoch */ | |
508 | buf = buffer + qh->offset; | |
509 | length = urb->transfer_buffer_length - qh->offset; | |
510 | if (rx_count > length) { | |
511 | if (urb->status == -EINPROGRESS) | |
512 | urb->status = -EOVERFLOW; | |
5c8a86e1 | 513 | dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length); |
550a7375 FB |
514 | do_flush = 1; |
515 | } else | |
516 | length = rx_count; | |
517 | urb->actual_length += length; | |
518 | qh->offset += length; | |
519 | ||
520 | /* see if we are done */ | |
521 | done = (urb->actual_length == urb->transfer_buffer_length) | |
522 | || (rx_count < qh->maxpacket) | |
523 | || (urb->status != -EINPROGRESS); | |
524 | if (done | |
525 | && (urb->status == -EINPROGRESS) | |
526 | && (urb->transfer_flags & URB_SHORT_NOT_OK) | |
527 | && (urb->actual_length | |
528 | < urb->transfer_buffer_length)) | |
529 | urb->status = -EREMOTEIO; | |
530 | } | |
531 | ||
532 | musb_read_fifo(hw_ep, length, buf); | |
533 | ||
534 | csr = musb_readw(epio, MUSB_RXCSR); | |
535 | csr |= MUSB_RXCSR_H_WZC_BITS; | |
536 | if (unlikely(do_flush)) | |
537 | musb_h_flush_rxfifo(hw_ep, csr); | |
538 | else { | |
539 | /* REVISIT this assumes AUTOCLEAR is never set */ | |
540 | csr &= ~(MUSB_RXCSR_RXPKTRDY | MUSB_RXCSR_H_REQPKT); | |
541 | if (!done) | |
542 | csr |= MUSB_RXCSR_H_REQPKT; | |
543 | musb_writew(epio, MUSB_RXCSR, csr); | |
544 | } | |
545 | ||
546 | return done; | |
547 | } | |
548 | ||
549 | /* we don't always need to reinit a given side of an endpoint... | |
550 | * when we do, use tx/rx reinit routine and then construct a new CSR | |
551 | * to address data toggle, NYET, and DMA or PIO. | |
552 | * | |
553 | * it's possible that driver bugs (especially for DMA) or aborting a | |
554 | * transfer might have left the endpoint busier than it should be. | |
555 | * the busy/not-empty tests are basically paranoia. | |
556 | */ | |
557 | static void | |
558 | musb_rx_reinit(struct musb *musb, struct musb_qh *qh, struct musb_hw_ep *ep) | |
559 | { | |
560 | u16 csr; | |
561 | ||
562 | /* NOTE: we know the "rx" fifo reinit never triggers for ep0. | |
563 | * That always uses tx_reinit since ep0 repurposes TX register | |
564 | * offsets; the initial SETUP packet is also a kind of OUT. | |
565 | */ | |
566 | ||
567 | /* if programmed for Tx, put it in RX mode */ | |
568 | if (ep->is_shared_fifo) { | |
569 | csr = musb_readw(ep->regs, MUSB_TXCSR); | |
570 | if (csr & MUSB_TXCSR_MODE) { | |
571 | musb_h_tx_flush_fifo(ep); | |
b6e434a5 | 572 | csr = musb_readw(ep->regs, MUSB_TXCSR); |
550a7375 | 573 | musb_writew(ep->regs, MUSB_TXCSR, |
b6e434a5 | 574 | csr | MUSB_TXCSR_FRCDATATOG); |
550a7375 | 575 | } |
b6e434a5 SS |
576 | |
577 | /* | |
578 | * Clear the MODE bit (and everything else) to enable Rx. | |
579 | * NOTE: we mustn't clear the DMAMODE bit before DMAENAB. | |
580 | */ | |
581 | if (csr & MUSB_TXCSR_DMAMODE) | |
582 | musb_writew(ep->regs, MUSB_TXCSR, MUSB_TXCSR_DMAMODE); | |
550a7375 FB |
583 | musb_writew(ep->regs, MUSB_TXCSR, 0); |
584 | ||
585 | /* scrub all previous state, clearing toggle */ | |
586 | } else { | |
587 | csr = musb_readw(ep->regs, MUSB_RXCSR); | |
588 | if (csr & MUSB_RXCSR_RXPKTRDY) | |
589 | WARNING("rx%d, packet/%d ready?\n", ep->epnum, | |
590 | musb_readw(ep->regs, MUSB_RXCOUNT)); | |
591 | ||
592 | musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG); | |
593 | } | |
594 | ||
595 | /* target addr and (for multipoint) hub addr/port */ | |
596 | if (musb->is_multipoint) { | |
c6cf8b00 BW |
597 | musb_write_rxfunaddr(ep->target_regs, qh->addr_reg); |
598 | musb_write_rxhubaddr(ep->target_regs, qh->h_addr_reg); | |
599 | musb_write_rxhubport(ep->target_regs, qh->h_port_reg); | |
600 | ||
550a7375 FB |
601 | } else |
602 | musb_writeb(musb->mregs, MUSB_FADDR, qh->addr_reg); | |
603 | ||
604 | /* protocol/endpoint, interval/NAKlimit, i/o size */ | |
605 | musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg); | |
606 | musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg); | |
607 | /* NOTE: bulk combining rewrites high bits of maxpacket */ | |
9f445cb2 CC |
608 | /* Set RXMAXP with the FIFO size of the endpoint |
609 | * to disable double buffer mode. | |
610 | */ | |
06624818 | 611 | if (musb->double_buffer_not_ok) |
9f445cb2 CC |
612 | musb_writew(ep->regs, MUSB_RXMAXP, ep->max_packet_sz_rx); |
613 | else | |
614 | musb_writew(ep->regs, MUSB_RXMAXP, | |
615 | qh->maxpacket | ((qh->hb_mult - 1) << 11)); | |
550a7375 FB |
616 | |
617 | ep->rx_reinit = 0; | |
618 | } | |
619 | ||
6b6e9710 SS |
620 | static bool musb_tx_dma_program(struct dma_controller *dma, |
621 | struct musb_hw_ep *hw_ep, struct musb_qh *qh, | |
622 | struct urb *urb, u32 offset, u32 length) | |
623 | { | |
624 | struct dma_channel *channel = hw_ep->tx_channel; | |
625 | void __iomem *epio = hw_ep->regs; | |
626 | u16 pkt_size = qh->maxpacket; | |
627 | u16 csr; | |
628 | u8 mode; | |
629 | ||
aee5500f | 630 | #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA) |
6b6e9710 SS |
631 | if (length > channel->max_len) |
632 | length = channel->max_len; | |
633 | ||
634 | csr = musb_readw(epio, MUSB_TXCSR); | |
635 | if (length > pkt_size) { | |
636 | mode = 1; | |
a483d706 AKG |
637 | csr |= MUSB_TXCSR_DMAMODE | MUSB_TXCSR_DMAENAB; |
638 | /* autoset shouldn't be set in high bandwidth */ | |
f2786281 | 639 | /* |
640 | * Enable Autoset according to table | |
641 | * below | |
642 | * bulk_split hb_mult Autoset_Enable | |
643 | * 0 1 Yes(Normal) | |
644 | * 0 >1 No(High BW ISO) | |
645 | * 1 1 Yes(HS bulk) | |
646 | * 1 >1 Yes(FS bulk) | |
647 | */ | |
648 | if (qh->hb_mult == 1 || (qh->hb_mult > 1 && | |
649 | can_bulk_split(hw_ep->musb, qh->type))) | |
a483d706 | 650 | csr |= MUSB_TXCSR_AUTOSET; |
6b6e9710 SS |
651 | } else { |
652 | mode = 0; | |
653 | csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE); | |
654 | csr |= MUSB_TXCSR_DMAENAB; /* against programmer's guide */ | |
655 | } | |
656 | channel->desired_mode = mode; | |
657 | musb_writew(epio, MUSB_TXCSR, csr); | |
658 | #else | |
659 | if (!is_cppi_enabled() && !tusb_dma_omap()) | |
660 | return false; | |
661 | ||
662 | channel->actual_len = 0; | |
663 | ||
664 | /* | |
665 | * TX uses "RNDIS" mode automatically but needs help | |
666 | * to identify the zero-length-final-packet case. | |
667 | */ | |
668 | mode = (urb->transfer_flags & URB_ZERO_PACKET) ? 1 : 0; | |
669 | #endif | |
670 | ||
671 | qh->segsize = length; | |
672 | ||
4c647338 SS |
673 | /* |
674 | * Ensure the data reaches to main memory before starting | |
675 | * DMA transfer | |
676 | */ | |
677 | wmb(); | |
678 | ||
6b6e9710 SS |
679 | if (!dma->channel_program(channel, pkt_size, mode, |
680 | urb->transfer_dma + offset, length)) { | |
681 | dma->channel_release(channel); | |
682 | hw_ep->tx_channel = NULL; | |
683 | ||
684 | csr = musb_readw(epio, MUSB_TXCSR); | |
685 | csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB); | |
686 | musb_writew(epio, MUSB_TXCSR, csr | MUSB_TXCSR_H_WZC_BITS); | |
687 | return false; | |
688 | } | |
689 | return true; | |
690 | } | |
550a7375 FB |
691 | |
692 | /* | |
693 | * Program an HDRC endpoint as per the given URB | |
694 | * Context: irqs blocked, controller lock held | |
695 | */ | |
696 | static void musb_ep_program(struct musb *musb, u8 epnum, | |
6b6e9710 SS |
697 | struct urb *urb, int is_out, |
698 | u8 *buf, u32 offset, u32 len) | |
550a7375 FB |
699 | { |
700 | struct dma_controller *dma_controller; | |
701 | struct dma_channel *dma_channel; | |
702 | u8 dma_ok; | |
703 | void __iomem *mbase = musb->mregs; | |
704 | struct musb_hw_ep *hw_ep = musb->endpoints + epnum; | |
705 | void __iomem *epio = hw_ep->regs; | |
3e5c6dc7 SS |
706 | struct musb_qh *qh = musb_ep_get_qh(hw_ep, !is_out); |
707 | u16 packet_sz = qh->maxpacket; | |
3132122c AKG |
708 | u8 use_dma = 1; |
709 | u16 csr; | |
550a7375 | 710 | |
5c8a86e1 | 711 | dev_dbg(musb->controller, "%s hw%d urb %p spd%d dev%d ep%d%s " |
550a7375 FB |
712 | "h_addr%02x h_port%02x bytes %d\n", |
713 | is_out ? "-->" : "<--", | |
714 | epnum, urb, urb->dev->speed, | |
715 | qh->addr_reg, qh->epnum, is_out ? "out" : "in", | |
716 | qh->h_addr_reg, qh->h_port_reg, | |
717 | len); | |
718 | ||
719 | musb_ep_select(mbase, epnum); | |
720 | ||
3132122c AKG |
721 | if (is_out && !len) { |
722 | use_dma = 0; | |
723 | csr = musb_readw(epio, MUSB_TXCSR); | |
724 | csr &= ~MUSB_TXCSR_DMAENAB; | |
725 | musb_writew(epio, MUSB_TXCSR, csr); | |
726 | hw_ep->tx_channel = NULL; | |
727 | } | |
728 | ||
550a7375 FB |
729 | /* candidate for DMA? */ |
730 | dma_controller = musb->dma_controller; | |
3132122c | 731 | if (use_dma && is_dma_capable() && epnum && dma_controller) { |
550a7375 FB |
732 | dma_channel = is_out ? hw_ep->tx_channel : hw_ep->rx_channel; |
733 | if (!dma_channel) { | |
734 | dma_channel = dma_controller->channel_alloc( | |
735 | dma_controller, hw_ep, is_out); | |
736 | if (is_out) | |
737 | hw_ep->tx_channel = dma_channel; | |
738 | else | |
739 | hw_ep->rx_channel = dma_channel; | |
740 | } | |
741 | } else | |
742 | dma_channel = NULL; | |
743 | ||
744 | /* make sure we clear DMAEnab, autoSet bits from previous run */ | |
745 | ||
746 | /* OUT/transmit/EP0 or IN/receive? */ | |
747 | if (is_out) { | |
748 | u16 csr; | |
749 | u16 int_txe; | |
750 | u16 load_count; | |
751 | ||
752 | csr = musb_readw(epio, MUSB_TXCSR); | |
753 | ||
754 | /* disable interrupt in case we flush */ | |
b18d26f6 | 755 | int_txe = musb->intrtxe; |
550a7375 FB |
756 | musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum)); |
757 | ||
758 | /* general endpoint setup */ | |
759 | if (epnum) { | |
550a7375 | 760 | /* flush all old state, set default */ |
a70b8442 | 761 | /* |
762 | * We could be flushing valid | |
763 | * packets in double buffering | |
764 | * case | |
765 | */ | |
766 | if (!hw_ep->tx_double_buffered) | |
767 | musb_h_tx_flush_fifo(hw_ep); | |
b6e434a5 SS |
768 | |
769 | /* | |
770 | * We must not clear the DMAMODE bit before or in | |
771 | * the same cycle with the DMAENAB bit, so we clear | |
772 | * the latter first... | |
773 | */ | |
550a7375 | 774 | csr &= ~(MUSB_TXCSR_H_NAKTIMEOUT |
b6e434a5 SS |
775 | | MUSB_TXCSR_AUTOSET |
776 | | MUSB_TXCSR_DMAENAB | |
550a7375 FB |
777 | | MUSB_TXCSR_FRCDATATOG |
778 | | MUSB_TXCSR_H_RXSTALL | |
779 | | MUSB_TXCSR_H_ERROR | |
780 | | MUSB_TXCSR_TXPKTRDY | |
781 | ); | |
782 | csr |= MUSB_TXCSR_MODE; | |
783 | ||
a70b8442 | 784 | if (!hw_ep->tx_double_buffered) { |
785 | if (usb_gettoggle(urb->dev, qh->epnum, 1)) | |
786 | csr |= MUSB_TXCSR_H_WR_DATATOGGLE | |
787 | | MUSB_TXCSR_H_DATATOGGLE; | |
788 | else | |
789 | csr |= MUSB_TXCSR_CLRDATATOG; | |
790 | } | |
550a7375 | 791 | |
550a7375 FB |
792 | musb_writew(epio, MUSB_TXCSR, csr); |
793 | /* REVISIT may need to clear FLUSHFIFO ... */ | |
b6e434a5 | 794 | csr &= ~MUSB_TXCSR_DMAMODE; |
550a7375 FB |
795 | musb_writew(epio, MUSB_TXCSR, csr); |
796 | csr = musb_readw(epio, MUSB_TXCSR); | |
797 | } else { | |
798 | /* endpoint 0: just flush */ | |
78322c1a | 799 | musb_h_ep0_flush_fifo(hw_ep); |
550a7375 FB |
800 | } |
801 | ||
802 | /* target addr and (for multipoint) hub addr/port */ | |
803 | if (musb->is_multipoint) { | |
c6cf8b00 BW |
804 | musb_write_txfunaddr(mbase, epnum, qh->addr_reg); |
805 | musb_write_txhubaddr(mbase, epnum, qh->h_addr_reg); | |
806 | musb_write_txhubport(mbase, epnum, qh->h_port_reg); | |
550a7375 FB |
807 | /* FIXME if !epnum, do the same for RX ... */ |
808 | } else | |
809 | musb_writeb(mbase, MUSB_FADDR, qh->addr_reg); | |
810 | ||
811 | /* protocol/endpoint/interval/NAKlimit */ | |
812 | if (epnum) { | |
813 | musb_writeb(epio, MUSB_TXTYPE, qh->type_reg); | |
f2786281 | 814 | if (musb->double_buffer_not_ok) { |
550a7375 | 815 | musb_writew(epio, MUSB_TXMAXP, |
06624818 | 816 | hw_ep->max_packet_sz_tx); |
f2786281 | 817 | } else if (can_bulk_split(musb, qh->type)) { |
818 | qh->hb_mult = hw_ep->max_packet_sz_tx | |
819 | / packet_sz; | |
ccc080c7 | 820 | musb_writew(epio, MUSB_TXMAXP, packet_sz |
f2786281 | 821 | | ((qh->hb_mult) - 1) << 11); |
822 | } else { | |
550a7375 | 823 | musb_writew(epio, MUSB_TXMAXP, |
06624818 FB |
824 | qh->maxpacket | |
825 | ((qh->hb_mult - 1) << 11)); | |
f2786281 | 826 | } |
550a7375 FB |
827 | musb_writeb(epio, MUSB_TXINTERVAL, qh->intv_reg); |
828 | } else { | |
829 | musb_writeb(epio, MUSB_NAKLIMIT0, qh->intv_reg); | |
830 | if (musb->is_multipoint) | |
831 | musb_writeb(epio, MUSB_TYPE0, | |
832 | qh->type_reg); | |
833 | } | |
834 | ||
835 | if (can_bulk_split(musb, qh->type)) | |
836 | load_count = min((u32) hw_ep->max_packet_sz_tx, | |
837 | len); | |
838 | else | |
839 | load_count = min((u32) packet_sz, len); | |
840 | ||
6b6e9710 SS |
841 | if (dma_channel && musb_tx_dma_program(dma_controller, |
842 | hw_ep, qh, urb, offset, len)) | |
843 | load_count = 0; | |
550a7375 FB |
844 | |
845 | if (load_count) { | |
550a7375 FB |
846 | /* PIO to load FIFO */ |
847 | qh->segsize = load_count; | |
8e8a5516 VS |
848 | if (!buf) { |
849 | sg_miter_start(&qh->sg_miter, urb->sg, 1, | |
850 | SG_MITER_ATOMIC | |
851 | | SG_MITER_FROM_SG); | |
852 | if (!sg_miter_next(&qh->sg_miter)) { | |
853 | dev_err(musb->controller, | |
854 | "error: sg" | |
855 | "list empty\n"); | |
856 | sg_miter_stop(&qh->sg_miter); | |
857 | goto finish; | |
858 | } | |
859 | buf = qh->sg_miter.addr + urb->sg->offset + | |
860 | urb->actual_length; | |
861 | load_count = min_t(u32, load_count, | |
862 | qh->sg_miter.length); | |
863 | musb_write_fifo(hw_ep, load_count, buf); | |
864 | qh->sg_miter.consumed = load_count; | |
865 | sg_miter_stop(&qh->sg_miter); | |
866 | } else | |
867 | musb_write_fifo(hw_ep, load_count, buf); | |
550a7375 | 868 | } |
8e8a5516 | 869 | finish: |
550a7375 FB |
870 | /* re-enable interrupt */ |
871 | musb_writew(mbase, MUSB_INTRTXE, int_txe); | |
872 | ||
873 | /* IN/receive */ | |
874 | } else { | |
875 | u16 csr; | |
876 | ||
877 | if (hw_ep->rx_reinit) { | |
878 | musb_rx_reinit(musb, qh, hw_ep); | |
879 | ||
880 | /* init new state: toggle and NYET, maybe DMA later */ | |
881 | if (usb_gettoggle(urb->dev, qh->epnum, 0)) | |
882 | csr = MUSB_RXCSR_H_WR_DATATOGGLE | |
883 | | MUSB_RXCSR_H_DATATOGGLE; | |
884 | else | |
885 | csr = 0; | |
886 | if (qh->type == USB_ENDPOINT_XFER_INT) | |
887 | csr |= MUSB_RXCSR_DISNYET; | |
888 | ||
889 | } else { | |
890 | csr = musb_readw(hw_ep->regs, MUSB_RXCSR); | |
891 | ||
892 | if (csr & (MUSB_RXCSR_RXPKTRDY | |
893 | | MUSB_RXCSR_DMAENAB | |
894 | | MUSB_RXCSR_H_REQPKT)) | |
895 | ERR("broken !rx_reinit, ep%d csr %04x\n", | |
896 | hw_ep->epnum, csr); | |
897 | ||
898 | /* scrub any stale state, leaving toggle alone */ | |
899 | csr &= MUSB_RXCSR_DISNYET; | |
900 | } | |
901 | ||
902 | /* kick things off */ | |
903 | ||
904 | if ((is_cppi_enabled() || tusb_dma_omap()) && dma_channel) { | |
c51e36dc SS |
905 | /* Candidate for DMA */ |
906 | dma_channel->actual_len = 0L; | |
907 | qh->segsize = len; | |
908 | ||
909 | /* AUTOREQ is in a DMA register */ | |
910 | musb_writew(hw_ep->regs, MUSB_RXCSR, csr); | |
911 | csr = musb_readw(hw_ep->regs, MUSB_RXCSR); | |
912 | ||
913 | /* | |
914 | * Unless caller treats short RX transfers as | |
915 | * errors, we dare not queue multiple transfers. | |
916 | */ | |
917 | dma_ok = dma_controller->channel_program(dma_channel, | |
918 | packet_sz, !(urb->transfer_flags & | |
919 | URB_SHORT_NOT_OK), | |
920 | urb->transfer_dma + offset, | |
921 | qh->segsize); | |
922 | if (!dma_ok) { | |
923 | dma_controller->channel_release(dma_channel); | |
924 | hw_ep->rx_channel = dma_channel = NULL; | |
925 | } else | |
926 | csr |= MUSB_RXCSR_DMAENAB; | |
550a7375 FB |
927 | } |
928 | ||
929 | csr |= MUSB_RXCSR_H_REQPKT; | |
5c8a86e1 | 930 | dev_dbg(musb->controller, "RXCSR%d := %04x\n", epnum, csr); |
550a7375 FB |
931 | musb_writew(hw_ep->regs, MUSB_RXCSR, csr); |
932 | csr = musb_readw(hw_ep->regs, MUSB_RXCSR); | |
933 | } | |
934 | } | |
935 | ||
f283862f AKG |
936 | /* Schedule next QH from musb->in_bulk/out_bulk and move the current qh to |
937 | * the end; avoids starvation for other endpoints. | |
938 | */ | |
939 | static void musb_bulk_nak_timeout(struct musb *musb, struct musb_hw_ep *ep, | |
940 | int is_in) | |
941 | { | |
942 | struct dma_channel *dma; | |
943 | struct urb *urb; | |
944 | void __iomem *mbase = musb->mregs; | |
945 | void __iomem *epio = ep->regs; | |
946 | struct musb_qh *cur_qh, *next_qh; | |
947 | u16 rx_csr, tx_csr; | |
948 | ||
949 | musb_ep_select(mbase, ep->epnum); | |
950 | if (is_in) { | |
951 | dma = is_dma_capable() ? ep->rx_channel : NULL; | |
952 | ||
953 | /* clear nak timeout bit */ | |
954 | rx_csr = musb_readw(epio, MUSB_RXCSR); | |
955 | rx_csr |= MUSB_RXCSR_H_WZC_BITS; | |
956 | rx_csr &= ~MUSB_RXCSR_DATAERROR; | |
957 | musb_writew(epio, MUSB_RXCSR, rx_csr); | |
958 | ||
959 | cur_qh = first_qh(&musb->in_bulk); | |
960 | } else { | |
961 | dma = is_dma_capable() ? ep->tx_channel : NULL; | |
962 | ||
963 | /* clear nak timeout bit */ | |
964 | tx_csr = musb_readw(epio, MUSB_TXCSR); | |
965 | tx_csr |= MUSB_TXCSR_H_WZC_BITS; | |
966 | tx_csr &= ~MUSB_TXCSR_H_NAKTIMEOUT; | |
967 | musb_writew(epio, MUSB_TXCSR, tx_csr); | |
968 | ||
969 | cur_qh = first_qh(&musb->out_bulk); | |
970 | } | |
971 | if (cur_qh) { | |
972 | urb = next_urb(cur_qh); | |
973 | if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { | |
974 | dma->status = MUSB_DMA_STATUS_CORE_ABORT; | |
975 | musb->dma_controller->channel_abort(dma); | |
976 | urb->actual_length += dma->actual_len; | |
977 | dma->actual_len = 0L; | |
978 | } | |
979 | musb_save_toggle(cur_qh, is_in, urb); | |
980 | ||
981 | if (is_in) { | |
982 | /* move cur_qh to end of queue */ | |
983 | list_move_tail(&cur_qh->ring, &musb->in_bulk); | |
984 | ||
985 | /* get the next qh from musb->in_bulk */ | |
986 | next_qh = first_qh(&musb->in_bulk); | |
987 | ||
988 | /* set rx_reinit and schedule the next qh */ | |
989 | ep->rx_reinit = 1; | |
990 | } else { | |
991 | /* move cur_qh to end of queue */ | |
992 | list_move_tail(&cur_qh->ring, &musb->out_bulk); | |
993 | ||
994 | /* get the next qh from musb->out_bulk */ | |
995 | next_qh = first_qh(&musb->out_bulk); | |
996 | ||
997 | /* set tx_reinit and schedule the next qh */ | |
998 | ep->tx_reinit = 1; | |
999 | } | |
1000 | musb_start_urb(musb, is_in, next_qh); | |
1001 | } | |
1002 | } | |
550a7375 FB |
1003 | |
1004 | /* | |
1005 | * Service the default endpoint (ep0) as host. | |
1006 | * Return true until it's time to start the status stage. | |
1007 | */ | |
1008 | static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb) | |
1009 | { | |
1010 | bool more = false; | |
1011 | u8 *fifo_dest = NULL; | |
1012 | u16 fifo_count = 0; | |
1013 | struct musb_hw_ep *hw_ep = musb->control_ep; | |
1014 | struct musb_qh *qh = hw_ep->in_qh; | |
1015 | struct usb_ctrlrequest *request; | |
1016 | ||
1017 | switch (musb->ep0_stage) { | |
1018 | case MUSB_EP0_IN: | |
1019 | fifo_dest = urb->transfer_buffer + urb->actual_length; | |
3ecdb9ac SS |
1020 | fifo_count = min_t(size_t, len, urb->transfer_buffer_length - |
1021 | urb->actual_length); | |
550a7375 FB |
1022 | if (fifo_count < len) |
1023 | urb->status = -EOVERFLOW; | |
1024 | ||
1025 | musb_read_fifo(hw_ep, fifo_count, fifo_dest); | |
1026 | ||
1027 | urb->actual_length += fifo_count; | |
1028 | if (len < qh->maxpacket) { | |
1029 | /* always terminate on short read; it's | |
1030 | * rarely reported as an error. | |
1031 | */ | |
1032 | } else if (urb->actual_length < | |
1033 | urb->transfer_buffer_length) | |
1034 | more = true; | |
1035 | break; | |
1036 | case MUSB_EP0_START: | |
1037 | request = (struct usb_ctrlrequest *) urb->setup_packet; | |
1038 | ||
1039 | if (!request->wLength) { | |
5c8a86e1 | 1040 | dev_dbg(musb->controller, "start no-DATA\n"); |
550a7375 FB |
1041 | break; |
1042 | } else if (request->bRequestType & USB_DIR_IN) { | |
5c8a86e1 | 1043 | dev_dbg(musb->controller, "start IN-DATA\n"); |
550a7375 FB |
1044 | musb->ep0_stage = MUSB_EP0_IN; |
1045 | more = true; | |
1046 | break; | |
1047 | } else { | |
5c8a86e1 | 1048 | dev_dbg(musb->controller, "start OUT-DATA\n"); |
550a7375 FB |
1049 | musb->ep0_stage = MUSB_EP0_OUT; |
1050 | more = true; | |
1051 | } | |
1052 | /* FALLTHROUGH */ | |
1053 | case MUSB_EP0_OUT: | |
3ecdb9ac SS |
1054 | fifo_count = min_t(size_t, qh->maxpacket, |
1055 | urb->transfer_buffer_length - | |
1056 | urb->actual_length); | |
550a7375 FB |
1057 | if (fifo_count) { |
1058 | fifo_dest = (u8 *) (urb->transfer_buffer | |
1059 | + urb->actual_length); | |
5c8a86e1 | 1060 | dev_dbg(musb->controller, "Sending %d byte%s to ep0 fifo %p\n", |
bb1c9ef1 DB |
1061 | fifo_count, |
1062 | (fifo_count == 1) ? "" : "s", | |
1063 | fifo_dest); | |
550a7375 FB |
1064 | musb_write_fifo(hw_ep, fifo_count, fifo_dest); |
1065 | ||
1066 | urb->actual_length += fifo_count; | |
1067 | more = true; | |
1068 | } | |
1069 | break; | |
1070 | default: | |
1071 | ERR("bogus ep0 stage %d\n", musb->ep0_stage); | |
1072 | break; | |
1073 | } | |
1074 | ||
1075 | return more; | |
1076 | } | |
1077 | ||
1078 | /* | |
1079 | * Handle default endpoint interrupt as host. Only called in IRQ time | |
c767c1c6 | 1080 | * from musb_interrupt(). |
550a7375 FB |
1081 | * |
1082 | * called with controller irqlocked | |
1083 | */ | |
1084 | irqreturn_t musb_h_ep0_irq(struct musb *musb) | |
1085 | { | |
1086 | struct urb *urb; | |
1087 | u16 csr, len; | |
1088 | int status = 0; | |
1089 | void __iomem *mbase = musb->mregs; | |
1090 | struct musb_hw_ep *hw_ep = musb->control_ep; | |
1091 | void __iomem *epio = hw_ep->regs; | |
1092 | struct musb_qh *qh = hw_ep->in_qh; | |
1093 | bool complete = false; | |
1094 | irqreturn_t retval = IRQ_NONE; | |
1095 | ||
1096 | /* ep0 only has one queue, "in" */ | |
1097 | urb = next_urb(qh); | |
1098 | ||
1099 | musb_ep_select(mbase, 0); | |
1100 | csr = musb_readw(epio, MUSB_CSR0); | |
1101 | len = (csr & MUSB_CSR0_RXPKTRDY) | |
1102 | ? musb_readb(epio, MUSB_COUNT0) | |
1103 | : 0; | |
1104 | ||
5c8a86e1 | 1105 | dev_dbg(musb->controller, "<== csr0 %04x, qh %p, count %d, urb %p, stage %d\n", |
550a7375 FB |
1106 | csr, qh, len, urb, musb->ep0_stage); |
1107 | ||
1108 | /* if we just did status stage, we are done */ | |
1109 | if (MUSB_EP0_STATUS == musb->ep0_stage) { | |
1110 | retval = IRQ_HANDLED; | |
1111 | complete = true; | |
1112 | } | |
1113 | ||
1114 | /* prepare status */ | |
1115 | if (csr & MUSB_CSR0_H_RXSTALL) { | |
5c8a86e1 | 1116 | dev_dbg(musb->controller, "STALLING ENDPOINT\n"); |
550a7375 FB |
1117 | status = -EPIPE; |
1118 | ||
1119 | } else if (csr & MUSB_CSR0_H_ERROR) { | |
5c8a86e1 | 1120 | dev_dbg(musb->controller, "no response, csr0 %04x\n", csr); |
550a7375 FB |
1121 | status = -EPROTO; |
1122 | ||
1123 | } else if (csr & MUSB_CSR0_H_NAKTIMEOUT) { | |
5c8a86e1 | 1124 | dev_dbg(musb->controller, "control NAK timeout\n"); |
550a7375 FB |
1125 | |
1126 | /* NOTE: this code path would be a good place to PAUSE a | |
1127 | * control transfer, if another one is queued, so that | |
1e0320f0 AKG |
1128 | * ep0 is more likely to stay busy. That's already done |
1129 | * for bulk RX transfers. | |
550a7375 FB |
1130 | * |
1131 | * if (qh->ring.next != &musb->control), then | |
1132 | * we have a candidate... NAKing is *NOT* an error | |
1133 | */ | |
1134 | musb_writew(epio, MUSB_CSR0, 0); | |
1135 | retval = IRQ_HANDLED; | |
1136 | } | |
1137 | ||
1138 | if (status) { | |
5c8a86e1 | 1139 | dev_dbg(musb->controller, "aborting\n"); |
550a7375 FB |
1140 | retval = IRQ_HANDLED; |
1141 | if (urb) | |
1142 | urb->status = status; | |
1143 | complete = true; | |
1144 | ||
1145 | /* use the proper sequence to abort the transfer */ | |
1146 | if (csr & MUSB_CSR0_H_REQPKT) { | |
1147 | csr &= ~MUSB_CSR0_H_REQPKT; | |
1148 | musb_writew(epio, MUSB_CSR0, csr); | |
1149 | csr &= ~MUSB_CSR0_H_NAKTIMEOUT; | |
1150 | musb_writew(epio, MUSB_CSR0, csr); | |
1151 | } else { | |
78322c1a | 1152 | musb_h_ep0_flush_fifo(hw_ep); |
550a7375 FB |
1153 | } |
1154 | ||
1155 | musb_writeb(epio, MUSB_NAKLIMIT0, 0); | |
1156 | ||
1157 | /* clear it */ | |
1158 | musb_writew(epio, MUSB_CSR0, 0); | |
1159 | } | |
1160 | ||
1161 | if (unlikely(!urb)) { | |
1162 | /* stop endpoint since we have no place for its data, this | |
1163 | * SHOULD NEVER HAPPEN! */ | |
1164 | ERR("no URB for end 0\n"); | |
1165 | ||
78322c1a | 1166 | musb_h_ep0_flush_fifo(hw_ep); |
550a7375 FB |
1167 | goto done; |
1168 | } | |
1169 | ||
1170 | if (!complete) { | |
1171 | /* call common logic and prepare response */ | |
1172 | if (musb_h_ep0_continue(musb, len, urb)) { | |
1173 | /* more packets required */ | |
1174 | csr = (MUSB_EP0_IN == musb->ep0_stage) | |
1175 | ? MUSB_CSR0_H_REQPKT : MUSB_CSR0_TXPKTRDY; | |
1176 | } else { | |
1177 | /* data transfer complete; perform status phase */ | |
1178 | if (usb_pipeout(urb->pipe) | |
1179 | || !urb->transfer_buffer_length) | |
1180 | csr = MUSB_CSR0_H_STATUSPKT | |
1181 | | MUSB_CSR0_H_REQPKT; | |
1182 | else | |
1183 | csr = MUSB_CSR0_H_STATUSPKT | |
1184 | | MUSB_CSR0_TXPKTRDY; | |
1185 | ||
3c4653c1 AKG |
1186 | /* disable ping token in status phase */ |
1187 | csr |= MUSB_CSR0_H_DIS_PING; | |
1188 | ||
550a7375 FB |
1189 | /* flag status stage */ |
1190 | musb->ep0_stage = MUSB_EP0_STATUS; | |
1191 | ||
5c8a86e1 | 1192 | dev_dbg(musb->controller, "ep0 STATUS, csr %04x\n", csr); |
550a7375 FB |
1193 | |
1194 | } | |
1195 | musb_writew(epio, MUSB_CSR0, csr); | |
1196 | retval = IRQ_HANDLED; | |
1197 | } else | |
1198 | musb->ep0_stage = MUSB_EP0_IDLE; | |
1199 | ||
1200 | /* call completion handler if done */ | |
1201 | if (complete) | |
1202 | musb_advance_schedule(musb, urb, hw_ep, 1); | |
1203 | done: | |
1204 | return retval; | |
1205 | } | |
1206 | ||
1207 | ||
1208 | #ifdef CONFIG_USB_INVENTRA_DMA | |
1209 | ||
1210 | /* Host side TX (OUT) using Mentor DMA works as follows: | |
1211 | submit_urb -> | |
1212 | - if queue was empty, Program Endpoint | |
1213 | - ... which starts DMA to fifo in mode 1 or 0 | |
1214 | ||
1215 | DMA Isr (transfer complete) -> TxAvail() | |
1216 | - Stop DMA (~DmaEnab) (<--- Alert ... currently happens | |
1217 | only in musb_cleanup_urb) | |
1218 | - TxPktRdy has to be set in mode 0 or for | |
1219 | short packets in mode 1. | |
1220 | */ | |
1221 | ||
1222 | #endif | |
1223 | ||
1224 | /* Service a Tx-Available or dma completion irq for the endpoint */ | |
1225 | void musb_host_tx(struct musb *musb, u8 epnum) | |
1226 | { | |
1227 | int pipe; | |
1228 | bool done = false; | |
1229 | u16 tx_csr; | |
6b6e9710 SS |
1230 | size_t length = 0; |
1231 | size_t offset = 0; | |
550a7375 FB |
1232 | struct musb_hw_ep *hw_ep = musb->endpoints + epnum; |
1233 | void __iomem *epio = hw_ep->regs; | |
3e5c6dc7 SS |
1234 | struct musb_qh *qh = hw_ep->out_qh; |
1235 | struct urb *urb = next_urb(qh); | |
550a7375 FB |
1236 | u32 status = 0; |
1237 | void __iomem *mbase = musb->mregs; | |
1238 | struct dma_channel *dma; | |
f8afbf7f | 1239 | bool transfer_pending = false; |
550a7375 | 1240 | |
550a7375 FB |
1241 | musb_ep_select(mbase, epnum); |
1242 | tx_csr = musb_readw(epio, MUSB_TXCSR); | |
1243 | ||
1244 | /* with CPPI, DMA sometimes triggers "extra" irqs */ | |
1245 | if (!urb) { | |
5c8a86e1 | 1246 | dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr); |
6b6e9710 | 1247 | return; |
550a7375 FB |
1248 | } |
1249 | ||
1250 | pipe = urb->pipe; | |
1251 | dma = is_dma_capable() ? hw_ep->tx_channel : NULL; | |
5c8a86e1 | 1252 | dev_dbg(musb->controller, "OUT/TX%d end, csr %04x%s\n", epnum, tx_csr, |
550a7375 FB |
1253 | dma ? ", dma" : ""); |
1254 | ||
1255 | /* check for errors */ | |
1256 | if (tx_csr & MUSB_TXCSR_H_RXSTALL) { | |
1257 | /* dma was disabled, fifo flushed */ | |
5c8a86e1 | 1258 | dev_dbg(musb->controller, "TX end %d stall\n", epnum); |
550a7375 FB |
1259 | |
1260 | /* stall; record URB status */ | |
1261 | status = -EPIPE; | |
1262 | ||
1263 | } else if (tx_csr & MUSB_TXCSR_H_ERROR) { | |
1264 | /* (NON-ISO) dma was disabled, fifo flushed */ | |
5c8a86e1 | 1265 | dev_dbg(musb->controller, "TX 3strikes on ep=%d\n", epnum); |
550a7375 FB |
1266 | |
1267 | status = -ETIMEDOUT; | |
1268 | ||
1269 | } else if (tx_csr & MUSB_TXCSR_H_NAKTIMEOUT) { | |
f283862f AKG |
1270 | if (USB_ENDPOINT_XFER_BULK == qh->type && qh->mux == 1 |
1271 | && !list_is_singular(&musb->out_bulk)) { | |
1272 | dev_dbg(musb->controller, | |
1273 | "NAK timeout on TX%d ep\n", epnum); | |
1274 | musb_bulk_nak_timeout(musb, hw_ep, 0); | |
1275 | } else { | |
1276 | dev_dbg(musb->controller, | |
1277 | "TX end=%d device not responding\n", epnum); | |
1278 | /* NOTE: this code path would be a good place to PAUSE a | |
1279 | * transfer, if there's some other (nonperiodic) tx urb | |
1280 | * that could use this fifo. (dma complicates it...) | |
1281 | * That's already done for bulk RX transfers. | |
1282 | * | |
1283 | * if (bulk && qh->ring.next != &musb->out_bulk), then | |
1284 | * we have a candidate... NAKing is *NOT* an error | |
1285 | */ | |
1286 | musb_ep_select(mbase, epnum); | |
1287 | musb_writew(epio, MUSB_TXCSR, | |
1288 | MUSB_TXCSR_H_WZC_BITS | |
1289 | | MUSB_TXCSR_TXPKTRDY); | |
1290 | } | |
1291 | return; | |
550a7375 FB |
1292 | } |
1293 | ||
8e8a5516 | 1294 | done: |
550a7375 FB |
1295 | if (status) { |
1296 | if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { | |
1297 | dma->status = MUSB_DMA_STATUS_CORE_ABORT; | |
1298 | (void) musb->dma_controller->channel_abort(dma); | |
1299 | } | |
1300 | ||
1301 | /* do the proper sequence to abort the transfer in the | |
1302 | * usb core; the dma engine should already be stopped. | |
1303 | */ | |
1304 | musb_h_tx_flush_fifo(hw_ep); | |
1305 | tx_csr &= ~(MUSB_TXCSR_AUTOSET | |
1306 | | MUSB_TXCSR_DMAENAB | |
1307 | | MUSB_TXCSR_H_ERROR | |
1308 | | MUSB_TXCSR_H_RXSTALL | |
1309 | | MUSB_TXCSR_H_NAKTIMEOUT | |
1310 | ); | |
1311 | ||
1312 | musb_ep_select(mbase, epnum); | |
1313 | musb_writew(epio, MUSB_TXCSR, tx_csr); | |
1314 | /* REVISIT may need to clear FLUSHFIFO ... */ | |
1315 | musb_writew(epio, MUSB_TXCSR, tx_csr); | |
1316 | musb_writeb(epio, MUSB_TXINTERVAL, 0); | |
1317 | ||
1318 | done = true; | |
1319 | } | |
1320 | ||
1321 | /* second cppi case */ | |
1322 | if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { | |
5c8a86e1 | 1323 | dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr); |
6b6e9710 | 1324 | return; |
550a7375 FB |
1325 | } |
1326 | ||
c7bbc056 SS |
1327 | if (is_dma_capable() && dma && !status) { |
1328 | /* | |
1329 | * DMA has completed. But if we're using DMA mode 1 (multi | |
1330 | * packet DMA), we need a terminal TXPKTRDY interrupt before | |
1331 | * we can consider this transfer completed, lest we trash | |
1332 | * its last packet when writing the next URB's data. So we | |
1333 | * switch back to mode 0 to get that interrupt; we'll come | |
1334 | * back here once it happens. | |
1335 | */ | |
1336 | if (tx_csr & MUSB_TXCSR_DMAMODE) { | |
1337 | /* | |
1338 | * We shouldn't clear DMAMODE with DMAENAB set; so | |
1339 | * clear them in a safe order. That should be OK | |
1340 | * once TXPKTRDY has been set (and I've never seen | |
1341 | * it being 0 at this moment -- DMA interrupt latency | |
1342 | * is significant) but if it hasn't been then we have | |
1343 | * no choice but to stop being polite and ignore the | |
1344 | * programmer's guide... :-) | |
1345 | * | |
1346 | * Note that we must write TXCSR with TXPKTRDY cleared | |
1347 | * in order not to re-trigger the packet send (this bit | |
1348 | * can't be cleared by CPU), and there's another caveat: | |
1349 | * TXPKTRDY may be set shortly and then cleared in the | |
1350 | * double-buffered FIFO mode, so we do an extra TXCSR | |
1351 | * read for debouncing... | |
1352 | */ | |
1353 | tx_csr &= musb_readw(epio, MUSB_TXCSR); | |
1354 | if (tx_csr & MUSB_TXCSR_TXPKTRDY) { | |
1355 | tx_csr &= ~(MUSB_TXCSR_DMAENAB | | |
1356 | MUSB_TXCSR_TXPKTRDY); | |
1357 | musb_writew(epio, MUSB_TXCSR, | |
1358 | tx_csr | MUSB_TXCSR_H_WZC_BITS); | |
1359 | } | |
1360 | tx_csr &= ~(MUSB_TXCSR_DMAMODE | | |
1361 | MUSB_TXCSR_TXPKTRDY); | |
1362 | musb_writew(epio, MUSB_TXCSR, | |
1363 | tx_csr | MUSB_TXCSR_H_WZC_BITS); | |
1364 | ||
1365 | /* | |
1366 | * There is no guarantee that we'll get an interrupt | |
1367 | * after clearing DMAMODE as we might have done this | |
1368 | * too late (after TXPKTRDY was cleared by controller). | |
1369 | * Re-read TXCSR as we have spoiled its previous value. | |
1370 | */ | |
1371 | tx_csr = musb_readw(epio, MUSB_TXCSR); | |
1372 | } | |
1373 | ||
1374 | /* | |
1375 | * We may get here from a DMA completion or TXPKTRDY interrupt. | |
1376 | * In any case, we must check the FIFO status here and bail out | |
1377 | * only if the FIFO still has data -- that should prevent the | |
1378 | * "missed" TXPKTRDY interrupts and deal with double-buffered | |
1379 | * FIFO mode too... | |
1380 | */ | |
1381 | if (tx_csr & (MUSB_TXCSR_FIFONOTEMPTY | MUSB_TXCSR_TXPKTRDY)) { | |
5c8a86e1 | 1382 | dev_dbg(musb->controller, "DMA complete but packet still in FIFO, " |
c7bbc056 SS |
1383 | "CSR %04x\n", tx_csr); |
1384 | return; | |
1385 | } | |
1386 | } | |
1387 | ||
550a7375 FB |
1388 | if (!status || dma || usb_pipeisoc(pipe)) { |
1389 | if (dma) | |
6b6e9710 | 1390 | length = dma->actual_len; |
550a7375 | 1391 | else |
6b6e9710 SS |
1392 | length = qh->segsize; |
1393 | qh->offset += length; | |
550a7375 FB |
1394 | |
1395 | if (usb_pipeisoc(pipe)) { | |
1396 | struct usb_iso_packet_descriptor *d; | |
1397 | ||
1398 | d = urb->iso_frame_desc + qh->iso_idx; | |
6b6e9710 SS |
1399 | d->actual_length = length; |
1400 | d->status = status; | |
550a7375 FB |
1401 | if (++qh->iso_idx >= urb->number_of_packets) { |
1402 | done = true; | |
1403 | } else { | |
1404 | d++; | |
6b6e9710 SS |
1405 | offset = d->offset; |
1406 | length = d->length; | |
550a7375 | 1407 | } |
f8afbf7f | 1408 | } else if (dma && urb->transfer_buffer_length == qh->offset) { |
550a7375 FB |
1409 | done = true; |
1410 | } else { | |
1411 | /* see if we need to send more data, or ZLP */ | |
1412 | if (qh->segsize < qh->maxpacket) | |
1413 | done = true; | |
1414 | else if (qh->offset == urb->transfer_buffer_length | |
1415 | && !(urb->transfer_flags | |
1416 | & URB_ZERO_PACKET)) | |
1417 | done = true; | |
1418 | if (!done) { | |
6b6e9710 SS |
1419 | offset = qh->offset; |
1420 | length = urb->transfer_buffer_length - offset; | |
f8afbf7f | 1421 | transfer_pending = true; |
550a7375 FB |
1422 | } |
1423 | } | |
1424 | } | |
1425 | ||
1426 | /* urb->status != -EINPROGRESS means request has been faulted, | |
1427 | * so we must abort this transfer after cleanup | |
1428 | */ | |
1429 | if (urb->status != -EINPROGRESS) { | |
1430 | done = true; | |
1431 | if (status == 0) | |
1432 | status = urb->status; | |
1433 | } | |
1434 | ||
1435 | if (done) { | |
1436 | /* set status */ | |
1437 | urb->status = status; | |
1438 | urb->actual_length = qh->offset; | |
1439 | musb_advance_schedule(musb, urb, hw_ep, USB_DIR_OUT); | |
6b6e9710 | 1440 | return; |
f8afbf7f | 1441 | } else if ((usb_pipeisoc(pipe) || transfer_pending) && dma) { |
6b6e9710 | 1442 | if (musb_tx_dma_program(musb->dma_controller, hw_ep, qh, urb, |
dfeffa53 AKG |
1443 | offset, length)) { |
1444 | if (is_cppi_enabled() || tusb_dma_omap()) | |
1445 | musb_h_tx_dma_start(hw_ep); | |
6b6e9710 | 1446 | return; |
dfeffa53 | 1447 | } |
6b6e9710 | 1448 | } else if (tx_csr & MUSB_TXCSR_DMAENAB) { |
5c8a86e1 | 1449 | dev_dbg(musb->controller, "not complete, but DMA enabled?\n"); |
6b6e9710 SS |
1450 | return; |
1451 | } | |
550a7375 | 1452 | |
6b6e9710 SS |
1453 | /* |
1454 | * PIO: start next packet in this URB. | |
1455 | * | |
1456 | * REVISIT: some docs say that when hw_ep->tx_double_buffered, | |
1457 | * (and presumably, FIFO is not half-full) we should write *two* | |
1458 | * packets before updating TXCSR; other docs disagree... | |
1459 | */ | |
1460 | if (length > qh->maxpacket) | |
1461 | length = qh->maxpacket; | |
496dda70 | 1462 | /* Unmap the buffer so that CPU can use it */ |
8b125df5 | 1463 | usb_hcd_unmap_urb_for_dma(musb->hcd, urb); |
8e8a5516 VS |
1464 | |
1465 | /* | |
1466 | * We need to map sg if the transfer_buffer is | |
1467 | * NULL. | |
1468 | */ | |
1469 | if (!urb->transfer_buffer) | |
ed74df12 | 1470 | qh->use_sg = true; |
8e8a5516 | 1471 | |
ed74df12 | 1472 | if (qh->use_sg) { |
8e8a5516 VS |
1473 | /* sg_miter_start is already done in musb_ep_program */ |
1474 | if (!sg_miter_next(&qh->sg_miter)) { | |
1475 | dev_err(musb->controller, "error: sg list empty\n"); | |
1476 | sg_miter_stop(&qh->sg_miter); | |
1477 | status = -EINVAL; | |
1478 | goto done; | |
1479 | } | |
1480 | urb->transfer_buffer = qh->sg_miter.addr; | |
1481 | length = min_t(u32, length, qh->sg_miter.length); | |
1482 | musb_write_fifo(hw_ep, length, urb->transfer_buffer); | |
1483 | qh->sg_miter.consumed = length; | |
1484 | sg_miter_stop(&qh->sg_miter); | |
1485 | } else { | |
1486 | musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset); | |
1487 | } | |
1488 | ||
6b6e9710 | 1489 | qh->segsize = length; |
550a7375 | 1490 | |
ed74df12 | 1491 | if (qh->use_sg) { |
8e8a5516 | 1492 | if (offset + length >= urb->transfer_buffer_length) |
ed74df12 | 1493 | qh->use_sg = false; |
8e8a5516 VS |
1494 | } |
1495 | ||
6b6e9710 SS |
1496 | musb_ep_select(mbase, epnum); |
1497 | musb_writew(epio, MUSB_TXCSR, | |
1498 | MUSB_TXCSR_H_WZC_BITS | MUSB_TXCSR_TXPKTRDY); | |
550a7375 FB |
1499 | } |
1500 | ||
1501 | ||
1502 | #ifdef CONFIG_USB_INVENTRA_DMA | |
1503 | ||
1504 | /* Host side RX (IN) using Mentor DMA works as follows: | |
1505 | submit_urb -> | |
1506 | - if queue was empty, ProgramEndpoint | |
1507 | - first IN token is sent out (by setting ReqPkt) | |
1508 | LinuxIsr -> RxReady() | |
1509 | /\ => first packet is received | |
1510 | | - Set in mode 0 (DmaEnab, ~ReqPkt) | |
1511 | | -> DMA Isr (transfer complete) -> RxReady() | |
1512 | | - Ack receive (~RxPktRdy), turn off DMA (~DmaEnab) | |
1513 | | - if urb not complete, send next IN token (ReqPkt) | |
1514 | | | else complete urb. | |
1515 | | | | |
1516 | --------------------------- | |
1517 | * | |
1518 | * Nuances of mode 1: | |
1519 | * For short packets, no ack (+RxPktRdy) is sent automatically | |
1520 | * (even if AutoClear is ON) | |
1521 | * For full packets, ack (~RxPktRdy) and next IN token (+ReqPkt) is sent | |
1522 | * automatically => major problem, as collecting the next packet becomes | |
1523 | * difficult. Hence mode 1 is not used. | |
1524 | * | |
1525 | * REVISIT | |
1526 | * All we care about at this driver level is that | |
1527 | * (a) all URBs terminate with REQPKT cleared and fifo(s) empty; | |
1528 | * (b) termination conditions are: short RX, or buffer full; | |
1529 | * (c) fault modes include | |
1530 | * - iff URB_SHORT_NOT_OK, short RX status is -EREMOTEIO. | |
1531 | * (and that endpoint's dma queue stops immediately) | |
1532 | * - overflow (full, PLUS more bytes in the terminal packet) | |
1533 | * | |
1534 | * So for example, usb-storage sets URB_SHORT_NOT_OK, and would | |
1535 | * thus be a great candidate for using mode 1 ... for all but the | |
1536 | * last packet of one URB's transfer. | |
1537 | */ | |
1538 | ||
1539 | #endif | |
1540 | ||
1541 | /* | |
1542 | * Service an RX interrupt for the given IN endpoint; docs cover bulk, iso, | |
1543 | * and high-bandwidth IN transfer cases. | |
1544 | */ | |
1545 | void musb_host_rx(struct musb *musb, u8 epnum) | |
1546 | { | |
1547 | struct urb *urb; | |
1548 | struct musb_hw_ep *hw_ep = musb->endpoints + epnum; | |
1549 | void __iomem *epio = hw_ep->regs; | |
1550 | struct musb_qh *qh = hw_ep->in_qh; | |
1551 | size_t xfer_len; | |
1552 | void __iomem *mbase = musb->mregs; | |
1553 | int pipe; | |
1554 | u16 rx_csr, val; | |
1555 | bool iso_err = false; | |
1556 | bool done = false; | |
1557 | u32 status; | |
1558 | struct dma_channel *dma; | |
8e8a5516 | 1559 | unsigned int sg_flags = SG_MITER_ATOMIC | SG_MITER_TO_SG; |
550a7375 FB |
1560 | |
1561 | musb_ep_select(mbase, epnum); | |
1562 | ||
1563 | urb = next_urb(qh); | |
1564 | dma = is_dma_capable() ? hw_ep->rx_channel : NULL; | |
1565 | status = 0; | |
1566 | xfer_len = 0; | |
1567 | ||
1568 | rx_csr = musb_readw(epio, MUSB_RXCSR); | |
1569 | val = rx_csr; | |
1570 | ||
1571 | if (unlikely(!urb)) { | |
1572 | /* REVISIT -- THIS SHOULD NEVER HAPPEN ... but, at least | |
1573 | * usbtest #11 (unlinks) triggers it regularly, sometimes | |
1574 | * with fifo full. (Only with DMA??) | |
1575 | */ | |
5c8a86e1 | 1576 | dev_dbg(musb->controller, "BOGUS RX%d ready, csr %04x, count %d\n", epnum, val, |
550a7375 FB |
1577 | musb_readw(epio, MUSB_RXCOUNT)); |
1578 | musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG); | |
1579 | return; | |
1580 | } | |
1581 | ||
1582 | pipe = urb->pipe; | |
1583 | ||
5c8a86e1 | 1584 | dev_dbg(musb->controller, "<== hw %d rxcsr %04x, urb actual %d (+dma %zu)\n", |
550a7375 FB |
1585 | epnum, rx_csr, urb->actual_length, |
1586 | dma ? dma->actual_len : 0); | |
1587 | ||
1588 | /* check for errors, concurrent stall & unlink is not really | |
1589 | * handled yet! */ | |
1590 | if (rx_csr & MUSB_RXCSR_H_RXSTALL) { | |
5c8a86e1 | 1591 | dev_dbg(musb->controller, "RX end %d STALL\n", epnum); |
550a7375 FB |
1592 | |
1593 | /* stall; record URB status */ | |
1594 | status = -EPIPE; | |
1595 | ||
1596 | } else if (rx_csr & MUSB_RXCSR_H_ERROR) { | |
5c8a86e1 | 1597 | dev_dbg(musb->controller, "end %d RX proto error\n", epnum); |
550a7375 FB |
1598 | |
1599 | status = -EPROTO; | |
1600 | musb_writeb(epio, MUSB_RXINTERVAL, 0); | |
1601 | ||
1602 | } else if (rx_csr & MUSB_RXCSR_DATAERROR) { | |
1603 | ||
1604 | if (USB_ENDPOINT_XFER_ISOC != qh->type) { | |
5c8a86e1 | 1605 | dev_dbg(musb->controller, "RX end %d NAK timeout\n", epnum); |
1e0320f0 AKG |
1606 | |
1607 | /* NOTE: NAKing is *NOT* an error, so we want to | |
1608 | * continue. Except ... if there's a request for | |
1609 | * another QH, use that instead of starving it. | |
550a7375 | 1610 | * |
1e0320f0 AKG |
1611 | * Devices like Ethernet and serial adapters keep |
1612 | * reads posted at all times, which will starve | |
1613 | * other devices without this logic. | |
550a7375 | 1614 | */ |
1e0320f0 AKG |
1615 | if (usb_pipebulk(urb->pipe) |
1616 | && qh->mux == 1 | |
1617 | && !list_is_singular(&musb->in_bulk)) { | |
f283862f | 1618 | musb_bulk_nak_timeout(musb, hw_ep, 1); |
1e0320f0 AKG |
1619 | return; |
1620 | } | |
550a7375 | 1621 | musb_ep_select(mbase, epnum); |
1e0320f0 AKG |
1622 | rx_csr |= MUSB_RXCSR_H_WZC_BITS; |
1623 | rx_csr &= ~MUSB_RXCSR_DATAERROR; | |
1624 | musb_writew(epio, MUSB_RXCSR, rx_csr); | |
550a7375 FB |
1625 | |
1626 | goto finish; | |
1627 | } else { | |
5c8a86e1 | 1628 | dev_dbg(musb->controller, "RX end %d ISO data error\n", epnum); |
550a7375 FB |
1629 | /* packet error reported later */ |
1630 | iso_err = true; | |
1631 | } | |
a483d706 | 1632 | } else if (rx_csr & MUSB_RXCSR_INCOMPRX) { |
5c8a86e1 | 1633 | dev_dbg(musb->controller, "end %d high bandwidth incomplete ISO packet RX\n", |
a483d706 AKG |
1634 | epnum); |
1635 | status = -EPROTO; | |
550a7375 FB |
1636 | } |
1637 | ||
1638 | /* faults abort the transfer */ | |
1639 | if (status) { | |
1640 | /* clean up dma and collect transfer count */ | |
1641 | if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { | |
1642 | dma->status = MUSB_DMA_STATUS_CORE_ABORT; | |
1643 | (void) musb->dma_controller->channel_abort(dma); | |
1644 | xfer_len = dma->actual_len; | |
1645 | } | |
1646 | musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG); | |
1647 | musb_writeb(epio, MUSB_RXINTERVAL, 0); | |
1648 | done = true; | |
1649 | goto finish; | |
1650 | } | |
1651 | ||
1652 | if (unlikely(dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY)) { | |
1653 | /* SHOULD NEVER HAPPEN ... but at least DaVinci has done it */ | |
1654 | ERR("RX%d dma busy, csr %04x\n", epnum, rx_csr); | |
1655 | goto finish; | |
1656 | } | |
1657 | ||
1658 | /* thorough shutdown for now ... given more precise fault handling | |
1659 | * and better queueing support, we might keep a DMA pipeline going | |
1660 | * while processing this irq for earlier completions. | |
1661 | */ | |
1662 | ||
1663 | /* FIXME this is _way_ too much in-line logic for Mentor DMA */ | |
1664 | ||
aee5500f | 1665 | #if !defined(CONFIG_USB_INVENTRA_DMA) && !defined(CONFIG_USB_UX500_DMA) |
550a7375 FB |
1666 | if (rx_csr & MUSB_RXCSR_H_REQPKT) { |
1667 | /* REVISIT this happened for a while on some short reads... | |
1668 | * the cleanup still needs investigation... looks bad... | |
1669 | * and also duplicates dma cleanup code above ... plus, | |
1670 | * shouldn't this be the "half full" double buffer case? | |
1671 | */ | |
1672 | if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { | |
1673 | dma->status = MUSB_DMA_STATUS_CORE_ABORT; | |
1674 | (void) musb->dma_controller->channel_abort(dma); | |
1675 | xfer_len = dma->actual_len; | |
1676 | done = true; | |
1677 | } | |
1678 | ||
5c8a86e1 | 1679 | dev_dbg(musb->controller, "RXCSR%d %04x, reqpkt, len %zu%s\n", epnum, rx_csr, |
550a7375 FB |
1680 | xfer_len, dma ? ", dma" : ""); |
1681 | rx_csr &= ~MUSB_RXCSR_H_REQPKT; | |
1682 | ||
1683 | musb_ep_select(mbase, epnum); | |
1684 | musb_writew(epio, MUSB_RXCSR, | |
1685 | MUSB_RXCSR_H_WZC_BITS | rx_csr); | |
1686 | } | |
1687 | #endif | |
1688 | if (dma && (rx_csr & MUSB_RXCSR_DMAENAB)) { | |
1689 | xfer_len = dma->actual_len; | |
1690 | ||
1691 | val &= ~(MUSB_RXCSR_DMAENAB | |
1692 | | MUSB_RXCSR_H_AUTOREQ | |
1693 | | MUSB_RXCSR_AUTOCLEAR | |
1694 | | MUSB_RXCSR_RXPKTRDY); | |
1695 | musb_writew(hw_ep->regs, MUSB_RXCSR, val); | |
1696 | ||
c57c41d2 GC |
1697 | #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA) || \ |
1698 | defined(CONFIG_USB_TI_CPPI41_DMA) | |
f82a689f AKG |
1699 | if (usb_pipeisoc(pipe)) { |
1700 | struct usb_iso_packet_descriptor *d; | |
1701 | ||
1702 | d = urb->iso_frame_desc + qh->iso_idx; | |
1703 | d->actual_length = xfer_len; | |
1704 | ||
1705 | /* even if there was an error, we did the dma | |
1706 | * for iso_frame_desc->length | |
1707 | */ | |
72887c86 | 1708 | if (d->status != -EILSEQ && d->status != -EOVERFLOW) |
f82a689f AKG |
1709 | d->status = 0; |
1710 | ||
c57c41d2 | 1711 | if (++qh->iso_idx >= urb->number_of_packets) { |
f82a689f | 1712 | done = true; |
c57c41d2 GC |
1713 | } else { |
1714 | #if defined(CONFIG_USB_TI_CPPI41_DMA) | |
1715 | struct dma_controller *c; | |
1716 | dma_addr_t *buf; | |
1717 | u32 length, ret; | |
1718 | ||
1719 | c = musb->dma_controller; | |
1720 | buf = (void *) | |
1721 | urb->iso_frame_desc[qh->iso_idx].offset | |
1722 | + (u32)urb->transfer_dma; | |
1723 | ||
1724 | length = | |
1725 | urb->iso_frame_desc[qh->iso_idx].length; | |
1726 | ||
1727 | val |= MUSB_RXCSR_DMAENAB; | |
1728 | musb_writew(hw_ep->regs, MUSB_RXCSR, val); | |
1729 | ||
1730 | ret = c->channel_program(dma, qh->maxpacket, | |
1731 | 0, (u32) buf, length); | |
1732 | #endif | |
f82a689f | 1733 | done = false; |
c57c41d2 | 1734 | } |
f82a689f AKG |
1735 | |
1736 | } else { | |
550a7375 FB |
1737 | /* done if urb buffer is full or short packet is recd */ |
1738 | done = (urb->actual_length + xfer_len >= | |
1739 | urb->transfer_buffer_length | |
1740 | || dma->actual_len < qh->maxpacket); | |
f82a689f | 1741 | } |
550a7375 FB |
1742 | |
1743 | /* send IN token for next packet, without AUTOREQ */ | |
1744 | if (!done) { | |
1745 | val |= MUSB_RXCSR_H_REQPKT; | |
1746 | musb_writew(epio, MUSB_RXCSR, | |
1747 | MUSB_RXCSR_H_WZC_BITS | val); | |
1748 | } | |
1749 | ||
5c8a86e1 | 1750 | dev_dbg(musb->controller, "ep %d dma %s, rxcsr %04x, rxcount %d\n", epnum, |
550a7375 FB |
1751 | done ? "off" : "reset", |
1752 | musb_readw(epio, MUSB_RXCSR), | |
1753 | musb_readw(epio, MUSB_RXCOUNT)); | |
1754 | #else | |
1755 | done = true; | |
1756 | #endif | |
1757 | } else if (urb->status == -EINPROGRESS) { | |
1758 | /* if no errors, be sure a packet is ready for unloading */ | |
1759 | if (unlikely(!(rx_csr & MUSB_RXCSR_RXPKTRDY))) { | |
1760 | status = -EPROTO; | |
1761 | ERR("Rx interrupt with no errors or packet!\n"); | |
1762 | ||
1763 | /* FIXME this is another "SHOULD NEVER HAPPEN" */ | |
1764 | ||
1765 | /* SCRUB (RX) */ | |
1766 | /* do the proper sequence to abort the transfer */ | |
1767 | musb_ep_select(mbase, epnum); | |
1768 | val &= ~MUSB_RXCSR_H_REQPKT; | |
1769 | musb_writew(epio, MUSB_RXCSR, val); | |
1770 | goto finish; | |
1771 | } | |
1772 | ||
1773 | /* we are expecting IN packets */ | |
c57c41d2 GC |
1774 | #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA) || \ |
1775 | defined(CONFIG_USB_TI_CPPI41_DMA) | |
550a7375 FB |
1776 | if (dma) { |
1777 | struct dma_controller *c; | |
1778 | u16 rx_count; | |
f82a689f AKG |
1779 | int ret, length; |
1780 | dma_addr_t buf; | |
550a7375 FB |
1781 | |
1782 | rx_count = musb_readw(epio, MUSB_RXCOUNT); | |
1783 | ||
91e3af64 | 1784 | dev_dbg(musb->controller, "RX%d count %d, buffer 0x%llx len %d/%d\n", |
550a7375 | 1785 | epnum, rx_count, |
91e3af64 FB |
1786 | (unsigned long long) urb->transfer_dma |
1787 | + urb->actual_length, | |
550a7375 FB |
1788 | qh->offset, |
1789 | urb->transfer_buffer_length); | |
1790 | ||
1791 | c = musb->dma_controller; | |
1792 | ||
f82a689f | 1793 | if (usb_pipeisoc(pipe)) { |
8b4959d6 | 1794 | int d_status = 0; |
f82a689f AKG |
1795 | struct usb_iso_packet_descriptor *d; |
1796 | ||
1797 | d = urb->iso_frame_desc + qh->iso_idx; | |
1798 | ||
1799 | if (iso_err) { | |
8b4959d6 | 1800 | d_status = -EILSEQ; |
f82a689f AKG |
1801 | urb->error_count++; |
1802 | } | |
1803 | if (rx_count > d->length) { | |
8b4959d6 FB |
1804 | if (d_status == 0) { |
1805 | d_status = -EOVERFLOW; | |
f82a689f AKG |
1806 | urb->error_count++; |
1807 | } | |
5c8a86e1 | 1808 | dev_dbg(musb->controller, "** OVERFLOW %d into %d\n",\ |
f82a689f AKG |
1809 | rx_count, d->length); |
1810 | ||
1811 | length = d->length; | |
1812 | } else | |
1813 | length = rx_count; | |
8b4959d6 | 1814 | d->status = d_status; |
f82a689f AKG |
1815 | buf = urb->transfer_dma + d->offset; |
1816 | } else { | |
1817 | length = rx_count; | |
1818 | buf = urb->transfer_dma + | |
1819 | urb->actual_length; | |
1820 | } | |
1821 | ||
550a7375 FB |
1822 | dma->desired_mode = 0; |
1823 | #ifdef USE_MODE1 | |
1824 | /* because of the issue below, mode 1 will | |
1825 | * only rarely behave with correct semantics. | |
1826 | */ | |
1827 | if ((urb->transfer_flags & | |
1828 | URB_SHORT_NOT_OK) | |
1829 | && (urb->transfer_buffer_length - | |
1830 | urb->actual_length) | |
1831 | > qh->maxpacket) | |
1832 | dma->desired_mode = 1; | |
f82a689f AKG |
1833 | if (rx_count < hw_ep->max_packet_sz_rx) { |
1834 | length = rx_count; | |
ae926976 | 1835 | dma->desired_mode = 0; |
f82a689f AKG |
1836 | } else { |
1837 | length = urb->transfer_buffer_length; | |
1838 | } | |
550a7375 FB |
1839 | #endif |
1840 | ||
1841 | /* Disadvantage of using mode 1: | |
1842 | * It's basically usable only for mass storage class; essentially all | |
1843 | * other protocols also terminate transfers on short packets. | |
1844 | * | |
1845 | * Details: | |
1846 | * An extra IN token is sent at the end of the transfer (due to AUTOREQ) | |
1847 | * If you try to use mode 1 for (transfer_buffer_length - 512), and try | |
1848 | * to use the extra IN token to grab the last packet using mode 0, then | |
1849 | * the problem is that you cannot be sure when the device will send the | |
1850 | * last packet and RxPktRdy set. Sometimes the packet is recd too soon | |
1851 | * such that it gets lost when RxCSR is re-set at the end of the mode 1 | |
1852 | * transfer, while sometimes it is recd just a little late so that if you | |
1853 | * try to configure for mode 0 soon after the mode 1 transfer is | |
1854 | * completed, you will find rxcount 0. Okay, so you might think why not | |
1855 | * wait for an interrupt when the pkt is recd. Well, you won't get any! | |
1856 | */ | |
1857 | ||
1858 | val = musb_readw(epio, MUSB_RXCSR); | |
1859 | val &= ~MUSB_RXCSR_H_REQPKT; | |
1860 | ||
1861 | if (dma->desired_mode == 0) | |
1862 | val &= ~MUSB_RXCSR_H_AUTOREQ; | |
1863 | else | |
1864 | val |= MUSB_RXCSR_H_AUTOREQ; | |
a483d706 AKG |
1865 | val |= MUSB_RXCSR_DMAENAB; |
1866 | ||
1867 | /* autoclear shouldn't be set in high bandwidth */ | |
1868 | if (qh->hb_mult == 1) | |
1869 | val |= MUSB_RXCSR_AUTOCLEAR; | |
550a7375 FB |
1870 | |
1871 | musb_writew(epio, MUSB_RXCSR, | |
1872 | MUSB_RXCSR_H_WZC_BITS | val); | |
1873 | ||
1874 | /* REVISIT if when actual_length != 0, | |
1875 | * transfer_buffer_length needs to be | |
1876 | * adjusted first... | |
1877 | */ | |
1878 | ret = c->channel_program( | |
1879 | dma, qh->maxpacket, | |
f82a689f | 1880 | dma->desired_mode, buf, length); |
550a7375 FB |
1881 | |
1882 | if (!ret) { | |
1883 | c->channel_release(dma); | |
1884 | hw_ep->rx_channel = NULL; | |
1885 | dma = NULL; | |
2ed9127c MS |
1886 | val = musb_readw(epio, MUSB_RXCSR); |
1887 | val &= ~(MUSB_RXCSR_DMAENAB | |
1888 | | MUSB_RXCSR_H_AUTOREQ | |
1889 | | MUSB_RXCSR_AUTOCLEAR); | |
1890 | musb_writew(epio, MUSB_RXCSR, val); | |
550a7375 FB |
1891 | } |
1892 | } | |
1893 | #endif /* Mentor DMA */ | |
1894 | ||
1895 | if (!dma) { | |
8e8a5516 VS |
1896 | unsigned int received_len; |
1897 | ||
496dda70 | 1898 | /* Unmap the buffer so that CPU can use it */ |
8b125df5 | 1899 | usb_hcd_unmap_urb_for_dma(musb->hcd, urb); |
8e8a5516 VS |
1900 | |
1901 | /* | |
1902 | * We need to map sg if the transfer_buffer is | |
1903 | * NULL. | |
1904 | */ | |
1905 | if (!urb->transfer_buffer) { | |
ed74df12 | 1906 | qh->use_sg = true; |
8e8a5516 VS |
1907 | sg_miter_start(&qh->sg_miter, urb->sg, 1, |
1908 | sg_flags); | |
1909 | } | |
1910 | ||
ed74df12 | 1911 | if (qh->use_sg) { |
8e8a5516 VS |
1912 | if (!sg_miter_next(&qh->sg_miter)) { |
1913 | dev_err(musb->controller, "error: sg list empty\n"); | |
1914 | sg_miter_stop(&qh->sg_miter); | |
1915 | status = -EINVAL; | |
1916 | done = true; | |
1917 | goto finish; | |
1918 | } | |
1919 | urb->transfer_buffer = qh->sg_miter.addr; | |
1920 | received_len = urb->actual_length; | |
1921 | qh->offset = 0x0; | |
1922 | done = musb_host_packet_rx(musb, urb, epnum, | |
1923 | iso_err); | |
1924 | /* Calculate the number of bytes received */ | |
1925 | received_len = urb->actual_length - | |
1926 | received_len; | |
1927 | qh->sg_miter.consumed = received_len; | |
1928 | sg_miter_stop(&qh->sg_miter); | |
1929 | } else { | |
1930 | done = musb_host_packet_rx(musb, urb, | |
1931 | epnum, iso_err); | |
1932 | } | |
5c8a86e1 | 1933 | dev_dbg(musb->controller, "read %spacket\n", done ? "last " : ""); |
550a7375 FB |
1934 | } |
1935 | } | |
1936 | ||
550a7375 FB |
1937 | finish: |
1938 | urb->actual_length += xfer_len; | |
1939 | qh->offset += xfer_len; | |
1940 | if (done) { | |
ed74df12 VS |
1941 | if (qh->use_sg) |
1942 | qh->use_sg = false; | |
8e8a5516 | 1943 | |
550a7375 FB |
1944 | if (urb->status == -EINPROGRESS) |
1945 | urb->status = status; | |
1946 | musb_advance_schedule(musb, urb, hw_ep, USB_DIR_IN); | |
1947 | } | |
1948 | } | |
1949 | ||
1950 | /* schedule nodes correspond to peripheral endpoints, like an OHCI QH. | |
1951 | * the software schedule associates multiple such nodes with a given | |
1952 | * host side hardware endpoint + direction; scheduling may activate | |
1953 | * that hardware endpoint. | |
1954 | */ | |
1955 | static int musb_schedule( | |
1956 | struct musb *musb, | |
1957 | struct musb_qh *qh, | |
1958 | int is_in) | |
1959 | { | |
1960 | int idle; | |
1961 | int best_diff; | |
1962 | int best_end, epnum; | |
1963 | struct musb_hw_ep *hw_ep = NULL; | |
1964 | struct list_head *head = NULL; | |
5274dab6 S |
1965 | u8 toggle; |
1966 | u8 txtype; | |
1967 | struct urb *urb = next_urb(qh); | |
550a7375 FB |
1968 | |
1969 | /* use fixed hardware for control and bulk */ | |
23d15e07 | 1970 | if (qh->type == USB_ENDPOINT_XFER_CONTROL) { |
550a7375 FB |
1971 | head = &musb->control; |
1972 | hw_ep = musb->control_ep; | |
550a7375 FB |
1973 | goto success; |
1974 | } | |
1975 | ||
1976 | /* else, periodic transfers get muxed to other endpoints */ | |
1977 | ||
5d67a851 SS |
1978 | /* |
1979 | * We know this qh hasn't been scheduled, so all we need to do | |
550a7375 FB |
1980 | * is choose which hardware endpoint to put it on ... |
1981 | * | |
1982 | * REVISIT what we really want here is a regular schedule tree | |
5d67a851 | 1983 | * like e.g. OHCI uses. |
550a7375 FB |
1984 | */ |
1985 | best_diff = 4096; | |
1986 | best_end = -1; | |
1987 | ||
5d67a851 SS |
1988 | for (epnum = 1, hw_ep = musb->endpoints + 1; |
1989 | epnum < musb->nr_endpoints; | |
1990 | epnum++, hw_ep++) { | |
550a7375 FB |
1991 | int diff; |
1992 | ||
3e5c6dc7 | 1993 | if (musb_ep_get_qh(hw_ep, is_in) != NULL) |
550a7375 | 1994 | continue; |
5d67a851 | 1995 | |
550a7375 FB |
1996 | if (hw_ep == musb->bulk_ep) |
1997 | continue; | |
1998 | ||
1999 | if (is_in) | |
a483d706 | 2000 | diff = hw_ep->max_packet_sz_rx; |
550a7375 | 2001 | else |
a483d706 AKG |
2002 | diff = hw_ep->max_packet_sz_tx; |
2003 | diff -= (qh->maxpacket * qh->hb_mult); | |
550a7375 | 2004 | |
23d15e07 | 2005 | if (diff >= 0 && best_diff > diff) { |
5274dab6 S |
2006 | |
2007 | /* | |
2008 | * Mentor controller has a bug in that if we schedule | |
2009 | * a BULK Tx transfer on an endpoint that had earlier | |
2010 | * handled ISOC then the BULK transfer has to start on | |
2011 | * a zero toggle. If the BULK transfer starts on a 1 | |
2012 | * toggle then this transfer will fail as the mentor | |
2013 | * controller starts the Bulk transfer on a 0 toggle | |
2014 | * irrespective of the programming of the toggle bits | |
2015 | * in the TXCSR register. Check for this condition | |
2016 | * while allocating the EP for a Tx Bulk transfer. If | |
2017 | * so skip this EP. | |
2018 | */ | |
2019 | hw_ep = musb->endpoints + epnum; | |
2020 | toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in); | |
2021 | txtype = (musb_readb(hw_ep->regs, MUSB_TXTYPE) | |
2022 | >> 4) & 0x3; | |
2023 | if (!is_in && (qh->type == USB_ENDPOINT_XFER_BULK) && | |
2024 | toggle && (txtype == USB_ENDPOINT_XFER_ISOC)) | |
2025 | continue; | |
2026 | ||
550a7375 FB |
2027 | best_diff = diff; |
2028 | best_end = epnum; | |
2029 | } | |
2030 | } | |
23d15e07 | 2031 | /* use bulk reserved ep1 if no other ep is free */ |
aa5cbbec | 2032 | if (best_end < 0 && qh->type == USB_ENDPOINT_XFER_BULK) { |
23d15e07 AKG |
2033 | hw_ep = musb->bulk_ep; |
2034 | if (is_in) | |
2035 | head = &musb->in_bulk; | |
2036 | else | |
2037 | head = &musb->out_bulk; | |
1e0320f0 | 2038 | |
f283862f | 2039 | /* Enable bulk RX/TX NAK timeout scheme when bulk requests are |
5ae477b0 | 2040 | * multiplexed. This scheme does not work in high speed to full |
1e0320f0 AKG |
2041 | * speed scenario as NAK interrupts are not coming from a |
2042 | * full speed device connected to a high speed device. | |
2043 | * NAK timeout interval is 8 (128 uframe or 16ms) for HS and | |
2044 | * 4 (8 frame or 8ms) for FS device. | |
2045 | */ | |
f283862f | 2046 | if (qh->dev) |
1e0320f0 AKG |
2047 | qh->intv_reg = |
2048 | (USB_SPEED_HIGH == qh->dev->speed) ? 8 : 4; | |
23d15e07 AKG |
2049 | goto success; |
2050 | } else if (best_end < 0) { | |
550a7375 | 2051 | return -ENOSPC; |
23d15e07 | 2052 | } |
550a7375 FB |
2053 | |
2054 | idle = 1; | |
23d15e07 | 2055 | qh->mux = 0; |
550a7375 | 2056 | hw_ep = musb->endpoints + best_end; |
5c8a86e1 | 2057 | dev_dbg(musb->controller, "qh %p periodic slot %d\n", qh, best_end); |
550a7375 | 2058 | success: |
23d15e07 AKG |
2059 | if (head) { |
2060 | idle = list_empty(head); | |
2061 | list_add_tail(&qh->ring, head); | |
2062 | qh->mux = 1; | |
2063 | } | |
550a7375 FB |
2064 | qh->hw_ep = hw_ep; |
2065 | qh->hep->hcpriv = qh; | |
2066 | if (idle) | |
2067 | musb_start_urb(musb, is_in, qh); | |
2068 | return 0; | |
2069 | } | |
2070 | ||
2071 | static int musb_urb_enqueue( | |
2072 | struct usb_hcd *hcd, | |
2073 | struct urb *urb, | |
2074 | gfp_t mem_flags) | |
2075 | { | |
2076 | unsigned long flags; | |
2077 | struct musb *musb = hcd_to_musb(hcd); | |
2078 | struct usb_host_endpoint *hep = urb->ep; | |
74bb3508 | 2079 | struct musb_qh *qh; |
550a7375 FB |
2080 | struct usb_endpoint_descriptor *epd = &hep->desc; |
2081 | int ret; | |
2082 | unsigned type_reg; | |
2083 | unsigned interval; | |
2084 | ||
2085 | /* host role must be active */ | |
2086 | if (!is_host_active(musb) || !musb->is_active) | |
2087 | return -ENODEV; | |
2088 | ||
2089 | spin_lock_irqsave(&musb->lock, flags); | |
2090 | ret = usb_hcd_link_urb_to_ep(hcd, urb); | |
74bb3508 DB |
2091 | qh = ret ? NULL : hep->hcpriv; |
2092 | if (qh) | |
2093 | urb->hcpriv = qh; | |
550a7375 | 2094 | spin_unlock_irqrestore(&musb->lock, flags); |
550a7375 FB |
2095 | |
2096 | /* DMA mapping was already done, if needed, and this urb is on | |
74bb3508 DB |
2097 | * hep->urb_list now ... so we're done, unless hep wasn't yet |
2098 | * scheduled onto a live qh. | |
550a7375 FB |
2099 | * |
2100 | * REVISIT best to keep hep->hcpriv valid until the endpoint gets | |
2101 | * disabled, testing for empty qh->ring and avoiding qh setup costs | |
2102 | * except for the first urb queued after a config change. | |
2103 | */ | |
74bb3508 DB |
2104 | if (qh || ret) |
2105 | return ret; | |
550a7375 FB |
2106 | |
2107 | /* Allocate and initialize qh, minimizing the work done each time | |
2108 | * hw_ep gets reprogrammed, or with irqs blocked. Then schedule it. | |
2109 | * | |
2110 | * REVISIT consider a dedicated qh kmem_cache, so it's harder | |
2111 | * for bugs in other kernel code to break this driver... | |
2112 | */ | |
2113 | qh = kzalloc(sizeof *qh, mem_flags); | |
2114 | if (!qh) { | |
2492e674 | 2115 | spin_lock_irqsave(&musb->lock, flags); |
550a7375 | 2116 | usb_hcd_unlink_urb_from_ep(hcd, urb); |
2492e674 | 2117 | spin_unlock_irqrestore(&musb->lock, flags); |
550a7375 FB |
2118 | return -ENOMEM; |
2119 | } | |
2120 | ||
2121 | qh->hep = hep; | |
2122 | qh->dev = urb->dev; | |
2123 | INIT_LIST_HEAD(&qh->ring); | |
2124 | qh->is_ready = 1; | |
2125 | ||
29cc8897 | 2126 | qh->maxpacket = usb_endpoint_maxp(epd); |
a483d706 | 2127 | qh->type = usb_endpoint_type(epd); |
550a7375 | 2128 | |
a483d706 AKG |
2129 | /* Bits 11 & 12 of wMaxPacketSize encode high bandwidth multiplier. |
2130 | * Some musb cores don't support high bandwidth ISO transfers; and | |
2131 | * we don't (yet!) support high bandwidth interrupt transfers. | |
2132 | */ | |
2133 | qh->hb_mult = 1 + ((qh->maxpacket >> 11) & 0x03); | |
2134 | if (qh->hb_mult > 1) { | |
2135 | int ok = (qh->type == USB_ENDPOINT_XFER_ISOC); | |
2136 | ||
2137 | if (ok) | |
2138 | ok = (usb_pipein(urb->pipe) && musb->hb_iso_rx) | |
2139 | || (usb_pipeout(urb->pipe) && musb->hb_iso_tx); | |
2140 | if (!ok) { | |
2141 | ret = -EMSGSIZE; | |
2142 | goto done; | |
2143 | } | |
2144 | qh->maxpacket &= 0x7ff; | |
550a7375 FB |
2145 | } |
2146 | ||
96bcd090 | 2147 | qh->epnum = usb_endpoint_num(epd); |
550a7375 FB |
2148 | |
2149 | /* NOTE: urb->dev->devnum is wrong during SET_ADDRESS */ | |
2150 | qh->addr_reg = (u8) usb_pipedevice(urb->pipe); | |
2151 | ||
2152 | /* precompute rxtype/txtype/type0 register */ | |
2153 | type_reg = (qh->type << 4) | qh->epnum; | |
2154 | switch (urb->dev->speed) { | |
2155 | case USB_SPEED_LOW: | |
2156 | type_reg |= 0xc0; | |
2157 | break; | |
2158 | case USB_SPEED_FULL: | |
2159 | type_reg |= 0x80; | |
2160 | break; | |
2161 | default: | |
2162 | type_reg |= 0x40; | |
2163 | } | |
2164 | qh->type_reg = type_reg; | |
2165 | ||
136733d6 | 2166 | /* Precompute RXINTERVAL/TXINTERVAL register */ |
550a7375 FB |
2167 | switch (qh->type) { |
2168 | case USB_ENDPOINT_XFER_INT: | |
136733d6 SS |
2169 | /* |
2170 | * Full/low speeds use the linear encoding, | |
2171 | * high speed uses the logarithmic encoding. | |
2172 | */ | |
2173 | if (urb->dev->speed <= USB_SPEED_FULL) { | |
2174 | interval = max_t(u8, epd->bInterval, 1); | |
2175 | break; | |
550a7375 FB |
2176 | } |
2177 | /* FALLTHROUGH */ | |
2178 | case USB_ENDPOINT_XFER_ISOC: | |
136733d6 SS |
2179 | /* ISO always uses logarithmic encoding */ |
2180 | interval = min_t(u8, epd->bInterval, 16); | |
550a7375 FB |
2181 | break; |
2182 | default: | |
2183 | /* REVISIT we actually want to use NAK limits, hinting to the | |
2184 | * transfer scheduling logic to try some other qh, e.g. try | |
2185 | * for 2 msec first: | |
2186 | * | |
2187 | * interval = (USB_SPEED_HIGH == urb->dev->speed) ? 16 : 2; | |
2188 | * | |
2189 | * The downside of disabling this is that transfer scheduling | |
2190 | * gets VERY unfair for nonperiodic transfers; a misbehaving | |
1e0320f0 AKG |
2191 | * peripheral could make that hurt. That's perfectly normal |
2192 | * for reads from network or serial adapters ... so we have | |
2193 | * partial NAKlimit support for bulk RX. | |
550a7375 | 2194 | * |
1e0320f0 | 2195 | * The upside of disabling it is simpler transfer scheduling. |
550a7375 FB |
2196 | */ |
2197 | interval = 0; | |
2198 | } | |
2199 | qh->intv_reg = interval; | |
2200 | ||
2201 | /* precompute addressing for external hub/tt ports */ | |
2202 | if (musb->is_multipoint) { | |
2203 | struct usb_device *parent = urb->dev->parent; | |
2204 | ||
2205 | if (parent != hcd->self.root_hub) { | |
2206 | qh->h_addr_reg = (u8) parent->devnum; | |
2207 | ||
2208 | /* set up tt info if needed */ | |
2209 | if (urb->dev->tt) { | |
2210 | qh->h_port_reg = (u8) urb->dev->ttport; | |
ae5ad296 AKG |
2211 | if (urb->dev->tt->hub) |
2212 | qh->h_addr_reg = | |
2213 | (u8) urb->dev->tt->hub->devnum; | |
2214 | if (urb->dev->tt->multi) | |
2215 | qh->h_addr_reg |= 0x80; | |
550a7375 FB |
2216 | } |
2217 | } | |
2218 | } | |
2219 | ||
2220 | /* invariant: hep->hcpriv is null OR the qh that's already scheduled. | |
2221 | * until we get real dma queues (with an entry for each urb/buffer), | |
2222 | * we only have work to do in the former case. | |
2223 | */ | |
2224 | spin_lock_irqsave(&musb->lock, flags); | |
3067779b | 2225 | if (hep->hcpriv || !next_urb(qh)) { |
550a7375 FB |
2226 | /* some concurrent activity submitted another urb to hep... |
2227 | * odd, rare, error prone, but legal. | |
2228 | */ | |
2229 | kfree(qh); | |
714bc5ef | 2230 | qh = NULL; |
550a7375 FB |
2231 | ret = 0; |
2232 | } else | |
2233 | ret = musb_schedule(musb, qh, | |
2234 | epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK); | |
2235 | ||
2236 | if (ret == 0) { | |
2237 | urb->hcpriv = qh; | |
2238 | /* FIXME set urb->start_frame for iso/intr, it's tested in | |
2239 | * musb_start_urb(), but otherwise only konicawc cares ... | |
2240 | */ | |
2241 | } | |
2242 | spin_unlock_irqrestore(&musb->lock, flags); | |
2243 | ||
2244 | done: | |
2245 | if (ret != 0) { | |
2492e674 | 2246 | spin_lock_irqsave(&musb->lock, flags); |
550a7375 | 2247 | usb_hcd_unlink_urb_from_ep(hcd, urb); |
2492e674 | 2248 | spin_unlock_irqrestore(&musb->lock, flags); |
550a7375 FB |
2249 | kfree(qh); |
2250 | } | |
2251 | return ret; | |
2252 | } | |
2253 | ||
2254 | ||
2255 | /* | |
2256 | * abort a transfer that's at the head of a hardware queue. | |
2257 | * called with controller locked, irqs blocked | |
2258 | * that hardware queue advances to the next transfer, unless prevented | |
2259 | */ | |
81ec4e4a | 2260 | static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh) |
550a7375 FB |
2261 | { |
2262 | struct musb_hw_ep *ep = qh->hw_ep; | |
5c8a86e1 | 2263 | struct musb *musb = ep->musb; |
550a7375 FB |
2264 | void __iomem *epio = ep->regs; |
2265 | unsigned hw_end = ep->epnum; | |
2266 | void __iomem *regs = ep->musb->mregs; | |
81ec4e4a | 2267 | int is_in = usb_pipein(urb->pipe); |
550a7375 | 2268 | int status = 0; |
81ec4e4a | 2269 | u16 csr; |
550a7375 FB |
2270 | |
2271 | musb_ep_select(regs, hw_end); | |
2272 | ||
2273 | if (is_dma_capable()) { | |
2274 | struct dma_channel *dma; | |
2275 | ||
2276 | dma = is_in ? ep->rx_channel : ep->tx_channel; | |
2277 | if (dma) { | |
2278 | status = ep->musb->dma_controller->channel_abort(dma); | |
5c8a86e1 | 2279 | dev_dbg(musb->controller, |
550a7375 FB |
2280 | "abort %cX%d DMA for urb %p --> %d\n", |
2281 | is_in ? 'R' : 'T', ep->epnum, | |
2282 | urb, status); | |
2283 | urb->actual_length += dma->actual_len; | |
2284 | } | |
2285 | } | |
2286 | ||
2287 | /* turn off DMA requests, discard state, stop polling ... */ | |
692933b2 | 2288 | if (ep->epnum && is_in) { |
550a7375 FB |
2289 | /* giveback saves bulk toggle */ |
2290 | csr = musb_h_flush_rxfifo(ep, 0); | |
2291 | ||
2292 | /* REVISIT we still get an irq; should likely clear the | |
2293 | * endpoint's irq status here to avoid bogus irqs. | |
2294 | * clearing that status is platform-specific... | |
2295 | */ | |
78322c1a | 2296 | } else if (ep->epnum) { |
550a7375 FB |
2297 | musb_h_tx_flush_fifo(ep); |
2298 | csr = musb_readw(epio, MUSB_TXCSR); | |
2299 | csr &= ~(MUSB_TXCSR_AUTOSET | |
2300 | | MUSB_TXCSR_DMAENAB | |
2301 | | MUSB_TXCSR_H_RXSTALL | |
2302 | | MUSB_TXCSR_H_NAKTIMEOUT | |
2303 | | MUSB_TXCSR_H_ERROR | |
2304 | | MUSB_TXCSR_TXPKTRDY); | |
2305 | musb_writew(epio, MUSB_TXCSR, csr); | |
2306 | /* REVISIT may need to clear FLUSHFIFO ... */ | |
2307 | musb_writew(epio, MUSB_TXCSR, csr); | |
2308 | /* flush cpu writebuffer */ | |
2309 | csr = musb_readw(epio, MUSB_TXCSR); | |
78322c1a DB |
2310 | } else { |
2311 | musb_h_ep0_flush_fifo(ep); | |
550a7375 FB |
2312 | } |
2313 | if (status == 0) | |
2314 | musb_advance_schedule(ep->musb, urb, ep, is_in); | |
2315 | return status; | |
2316 | } | |
2317 | ||
2318 | static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) | |
2319 | { | |
2320 | struct musb *musb = hcd_to_musb(hcd); | |
2321 | struct musb_qh *qh; | |
550a7375 | 2322 | unsigned long flags; |
22a0d6f1 | 2323 | int is_in = usb_pipein(urb->pipe); |
550a7375 FB |
2324 | int ret; |
2325 | ||
5c8a86e1 | 2326 | dev_dbg(musb->controller, "urb=%p, dev%d ep%d%s\n", urb, |
550a7375 FB |
2327 | usb_pipedevice(urb->pipe), |
2328 | usb_pipeendpoint(urb->pipe), | |
22a0d6f1 | 2329 | is_in ? "in" : "out"); |
550a7375 FB |
2330 | |
2331 | spin_lock_irqsave(&musb->lock, flags); | |
2332 | ret = usb_hcd_check_unlink_urb(hcd, urb, status); | |
2333 | if (ret) | |
2334 | goto done; | |
2335 | ||
2336 | qh = urb->hcpriv; | |
2337 | if (!qh) | |
2338 | goto done; | |
2339 | ||
22a0d6f1 SS |
2340 | /* |
2341 | * Any URB not actively programmed into endpoint hardware can be | |
a2fd814e | 2342 | * immediately given back; that's any URB not at the head of an |
550a7375 | 2343 | * endpoint queue, unless someday we get real DMA queues. And even |
a2fd814e | 2344 | * if it's at the head, it might not be known to the hardware... |
550a7375 | 2345 | * |
22a0d6f1 | 2346 | * Otherwise abort current transfer, pending DMA, etc.; urb->status |
550a7375 FB |
2347 | * has already been updated. This is a synchronous abort; it'd be |
2348 | * OK to hold off until after some IRQ, though. | |
22a0d6f1 SS |
2349 | * |
2350 | * NOTE: qh is invalid unless !list_empty(&hep->urb_list) | |
550a7375 | 2351 | */ |
22a0d6f1 SS |
2352 | if (!qh->is_ready |
2353 | || urb->urb_list.prev != &qh->hep->urb_list | |
2354 | || musb_ep_get_qh(qh->hw_ep, is_in) != qh) { | |
550a7375 FB |
2355 | int ready = qh->is_ready; |
2356 | ||
550a7375 | 2357 | qh->is_ready = 0; |
c9cd06b3 | 2358 | musb_giveback(musb, urb, 0); |
550a7375 | 2359 | qh->is_ready = ready; |
a2fd814e SS |
2360 | |
2361 | /* If nothing else (usually musb_giveback) is using it | |
2362 | * and its URB list has emptied, recycle this qh. | |
2363 | */ | |
2364 | if (ready && list_empty(&qh->hep->urb_list)) { | |
2365 | qh->hep->hcpriv = NULL; | |
2366 | list_del(&qh->ring); | |
2367 | kfree(qh); | |
2368 | } | |
550a7375 | 2369 | } else |
81ec4e4a | 2370 | ret = musb_cleanup_urb(urb, qh); |
550a7375 FB |
2371 | done: |
2372 | spin_unlock_irqrestore(&musb->lock, flags); | |
2373 | return ret; | |
2374 | } | |
2375 | ||
2376 | /* disable an endpoint */ | |
2377 | static void | |
2378 | musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep) | |
2379 | { | |
22a0d6f1 | 2380 | u8 is_in = hep->desc.bEndpointAddress & USB_DIR_IN; |
550a7375 FB |
2381 | unsigned long flags; |
2382 | struct musb *musb = hcd_to_musb(hcd); | |
dc61d238 SS |
2383 | struct musb_qh *qh; |
2384 | struct urb *urb; | |
550a7375 | 2385 | |
550a7375 FB |
2386 | spin_lock_irqsave(&musb->lock, flags); |
2387 | ||
dc61d238 SS |
2388 | qh = hep->hcpriv; |
2389 | if (qh == NULL) | |
2390 | goto exit; | |
2391 | ||
22a0d6f1 | 2392 | /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */ |
550a7375 | 2393 | |
22a0d6f1 | 2394 | /* Kick the first URB off the hardware, if needed */ |
550a7375 | 2395 | qh->is_ready = 0; |
22a0d6f1 | 2396 | if (musb_ep_get_qh(qh->hw_ep, is_in) == qh) { |
550a7375 FB |
2397 | urb = next_urb(qh); |
2398 | ||
2399 | /* make software (then hardware) stop ASAP */ | |
2400 | if (!urb->unlinked) | |
2401 | urb->status = -ESHUTDOWN; | |
2402 | ||
2403 | /* cleanup */ | |
81ec4e4a | 2404 | musb_cleanup_urb(urb, qh); |
550a7375 | 2405 | |
dc61d238 SS |
2406 | /* Then nuke all the others ... and advance the |
2407 | * queue on hw_ep (e.g. bulk ring) when we're done. | |
2408 | */ | |
2409 | while (!list_empty(&hep->urb_list)) { | |
2410 | urb = next_urb(qh); | |
2411 | urb->status = -ESHUTDOWN; | |
2412 | musb_advance_schedule(musb, urb, qh->hw_ep, is_in); | |
2413 | } | |
2414 | } else { | |
2415 | /* Just empty the queue; the hardware is busy with | |
2416 | * other transfers, and since !qh->is_ready nothing | |
2417 | * will activate any of these as it advances. | |
2418 | */ | |
2419 | while (!list_empty(&hep->urb_list)) | |
c9cd06b3 | 2420 | musb_giveback(musb, next_urb(qh), -ESHUTDOWN); |
550a7375 | 2421 | |
dc61d238 SS |
2422 | hep->hcpriv = NULL; |
2423 | list_del(&qh->ring); | |
2424 | kfree(qh); | |
2425 | } | |
2426 | exit: | |
550a7375 FB |
2427 | spin_unlock_irqrestore(&musb->lock, flags); |
2428 | } | |
2429 | ||
2430 | static int musb_h_get_frame_number(struct usb_hcd *hcd) | |
2431 | { | |
2432 | struct musb *musb = hcd_to_musb(hcd); | |
2433 | ||
2434 | return musb_readw(musb->mregs, MUSB_FRAME); | |
2435 | } | |
2436 | ||
2437 | static int musb_h_start(struct usb_hcd *hcd) | |
2438 | { | |
2439 | struct musb *musb = hcd_to_musb(hcd); | |
2440 | ||
2441 | /* NOTE: musb_start() is called when the hub driver turns | |
2442 | * on port power, or when (OTG) peripheral starts. | |
2443 | */ | |
2444 | hcd->state = HC_STATE_RUNNING; | |
2445 | musb->port1_status = 0; | |
2446 | return 0; | |
2447 | } | |
2448 | ||
2449 | static void musb_h_stop(struct usb_hcd *hcd) | |
2450 | { | |
2451 | musb_stop(hcd_to_musb(hcd)); | |
2452 | hcd->state = HC_STATE_HALT; | |
2453 | } | |
2454 | ||
2455 | static int musb_bus_suspend(struct usb_hcd *hcd) | |
2456 | { | |
2457 | struct musb *musb = hcd_to_musb(hcd); | |
89368d3d | 2458 | u8 devctl; |
550a7375 | 2459 | |
94f72136 DM |
2460 | musb_port_suspend(musb, true); |
2461 | ||
89368d3d | 2462 | if (!is_host_active(musb)) |
550a7375 FB |
2463 | return 0; |
2464 | ||
89368d3d DB |
2465 | switch (musb->xceiv->state) { |
2466 | case OTG_STATE_A_SUSPEND: | |
2467 | return 0; | |
2468 | case OTG_STATE_A_WAIT_VRISE: | |
2469 | /* ID could be grounded even if there's no device | |
2470 | * on the other end of the cable. NOTE that the | |
2471 | * A_WAIT_VRISE timers are messy with MUSB... | |
2472 | */ | |
2473 | devctl = musb_readb(musb->mregs, MUSB_DEVCTL); | |
2474 | if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) | |
2475 | musb->xceiv->state = OTG_STATE_A_WAIT_BCON; | |
2476 | break; | |
2477 | default: | |
2478 | break; | |
2479 | } | |
2480 | ||
2481 | if (musb->is_active) { | |
2482 | WARNING("trying to suspend as %s while active\n", | |
42c0bf1c | 2483 | usb_otg_state_string(musb->xceiv->state)); |
550a7375 FB |
2484 | return -EBUSY; |
2485 | } else | |
2486 | return 0; | |
2487 | } | |
2488 | ||
2489 | static int musb_bus_resume(struct usb_hcd *hcd) | |
2490 | { | |
869c5978 DM |
2491 | struct musb *musb = hcd_to_musb(hcd); |
2492 | ||
2493 | if (musb->config && | |
2494 | musb->config->host_port_deassert_reset_at_resume) | |
2495 | musb_port_reset(musb, false); | |
2496 | ||
550a7375 FB |
2497 | return 0; |
2498 | } | |
2499 | ||
8408fd1d RB |
2500 | #ifndef CONFIG_MUSB_PIO_ONLY |
2501 | ||
2502 | #define MUSB_USB_DMA_ALIGN 4 | |
2503 | ||
2504 | struct musb_temp_buffer { | |
2505 | void *kmalloc_ptr; | |
2506 | void *old_xfer_buffer; | |
2507 | u8 data[0]; | |
2508 | }; | |
2509 | ||
2510 | static void musb_free_temp_buffer(struct urb *urb) | |
2511 | { | |
2512 | enum dma_data_direction dir; | |
2513 | struct musb_temp_buffer *temp; | |
2514 | ||
2515 | if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER)) | |
2516 | return; | |
2517 | ||
2518 | dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; | |
2519 | ||
2520 | temp = container_of(urb->transfer_buffer, struct musb_temp_buffer, | |
2521 | data); | |
2522 | ||
2523 | if (dir == DMA_FROM_DEVICE) { | |
2524 | memcpy(temp->old_xfer_buffer, temp->data, | |
2525 | urb->transfer_buffer_length); | |
2526 | } | |
2527 | urb->transfer_buffer = temp->old_xfer_buffer; | |
2528 | kfree(temp->kmalloc_ptr); | |
2529 | ||
2530 | urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER; | |
2531 | } | |
2532 | ||
2533 | static int musb_alloc_temp_buffer(struct urb *urb, gfp_t mem_flags) | |
2534 | { | |
2535 | enum dma_data_direction dir; | |
2536 | struct musb_temp_buffer *temp; | |
2537 | void *kmalloc_ptr; | |
2538 | size_t kmalloc_size; | |
2539 | ||
2540 | if (urb->num_sgs || urb->sg || | |
2541 | urb->transfer_buffer_length == 0 || | |
2542 | !((uintptr_t)urb->transfer_buffer & (MUSB_USB_DMA_ALIGN - 1))) | |
2543 | return 0; | |
2544 | ||
2545 | dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; | |
2546 | ||
2547 | /* Allocate a buffer with enough padding for alignment */ | |
2548 | kmalloc_size = urb->transfer_buffer_length + | |
2549 | sizeof(struct musb_temp_buffer) + MUSB_USB_DMA_ALIGN - 1; | |
2550 | ||
2551 | kmalloc_ptr = kmalloc(kmalloc_size, mem_flags); | |
2552 | if (!kmalloc_ptr) | |
2553 | return -ENOMEM; | |
2554 | ||
2555 | /* Position our struct temp_buffer such that data is aligned */ | |
2556 | temp = PTR_ALIGN(kmalloc_ptr, MUSB_USB_DMA_ALIGN); | |
2557 | ||
2558 | ||
2559 | temp->kmalloc_ptr = kmalloc_ptr; | |
2560 | temp->old_xfer_buffer = urb->transfer_buffer; | |
2561 | if (dir == DMA_TO_DEVICE) | |
2562 | memcpy(temp->data, urb->transfer_buffer, | |
2563 | urb->transfer_buffer_length); | |
2564 | urb->transfer_buffer = temp->data; | |
2565 | ||
2566 | urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER; | |
2567 | ||
2568 | return 0; | |
2569 | } | |
2570 | ||
2571 | static int musb_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb, | |
2572 | gfp_t mem_flags) | |
2573 | { | |
2574 | struct musb *musb = hcd_to_musb(hcd); | |
2575 | int ret; | |
2576 | ||
2577 | /* | |
2578 | * The DMA engine in RTL1.8 and above cannot handle | |
2579 | * DMA addresses that are not aligned to a 4 byte boundary. | |
2580 | * For such engine implemented (un)map_urb_for_dma hooks. | |
2581 | * Do not use these hooks for RTL<1.8 | |
2582 | */ | |
2583 | if (musb->hwvers < MUSB_HWVERS_1800) | |
2584 | return usb_hcd_map_urb_for_dma(hcd, urb, mem_flags); | |
2585 | ||
2586 | ret = musb_alloc_temp_buffer(urb, mem_flags); | |
2587 | if (ret) | |
2588 | return ret; | |
2589 | ||
2590 | ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags); | |
2591 | if (ret) | |
2592 | musb_free_temp_buffer(urb); | |
2593 | ||
2594 | return ret; | |
2595 | } | |
2596 | ||
2597 | static void musb_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb) | |
2598 | { | |
2599 | struct musb *musb = hcd_to_musb(hcd); | |
2600 | ||
2601 | usb_hcd_unmap_urb_for_dma(hcd, urb); | |
2602 | ||
2603 | /* Do not use this hook for RTL<1.8 (see description above) */ | |
2604 | if (musb->hwvers < MUSB_HWVERS_1800) | |
2605 | return; | |
2606 | ||
2607 | musb_free_temp_buffer(urb); | |
2608 | } | |
2609 | #endif /* !CONFIG_MUSB_PIO_ONLY */ | |
2610 | ||
74c2e936 | 2611 | static const struct hc_driver musb_hc_driver = { |
550a7375 FB |
2612 | .description = "musb-hcd", |
2613 | .product_desc = "MUSB HDRC host driver", | |
74c2e936 | 2614 | .hcd_priv_size = sizeof(struct musb *), |
550a7375 FB |
2615 | .flags = HCD_USB2 | HCD_MEMORY, |
2616 | ||
2617 | /* not using irq handler or reset hooks from usbcore, since | |
2618 | * those must be shared with peripheral code for OTG configs | |
2619 | */ | |
2620 | ||
2621 | .start = musb_h_start, | |
2622 | .stop = musb_h_stop, | |
2623 | ||
2624 | .get_frame_number = musb_h_get_frame_number, | |
2625 | ||
2626 | .urb_enqueue = musb_urb_enqueue, | |
2627 | .urb_dequeue = musb_urb_dequeue, | |
2628 | .endpoint_disable = musb_h_disable, | |
2629 | ||
8408fd1d RB |
2630 | #ifndef CONFIG_MUSB_PIO_ONLY |
2631 | .map_urb_for_dma = musb_map_urb_for_dma, | |
2632 | .unmap_urb_for_dma = musb_unmap_urb_for_dma, | |
2633 | #endif | |
2634 | ||
550a7375 FB |
2635 | .hub_status_data = musb_hub_status_data, |
2636 | .hub_control = musb_hub_control, | |
2637 | .bus_suspend = musb_bus_suspend, | |
2638 | .bus_resume = musb_bus_resume, | |
2639 | /* .start_port_reset = NULL, */ | |
2640 | /* .hub_irq_enable = NULL, */ | |
2641 | }; | |
0b3eba44 | 2642 | |
74c2e936 DM |
2643 | int musb_host_alloc(struct musb *musb) |
2644 | { | |
2645 | struct device *dev = musb->controller; | |
2646 | ||
2647 | /* usbcore sets dev->driver_data to hcd, and sometimes uses that... */ | |
2648 | musb->hcd = usb_create_hcd(&musb_hc_driver, dev, dev_name(dev)); | |
2649 | if (!musb->hcd) | |
2650 | return -EINVAL; | |
2651 | ||
2652 | *musb->hcd->hcd_priv = (unsigned long) musb; | |
2653 | musb->hcd->self.uses_pio_for_control = 1; | |
2654 | musb->hcd->uses_new_polling = 1; | |
2655 | musb->hcd->has_tt = 1; | |
2656 | ||
2657 | return 0; | |
2658 | } | |
2659 | ||
2660 | void musb_host_cleanup(struct musb *musb) | |
2661 | { | |
90474288 SAS |
2662 | if (musb->port_mode == MUSB_PORT_MODE_GADGET) |
2663 | return; | |
74c2e936 DM |
2664 | usb_remove_hcd(musb->hcd); |
2665 | musb->hcd = NULL; | |
2666 | } | |
2667 | ||
2668 | void musb_host_free(struct musb *musb) | |
2669 | { | |
2670 | usb_put_hcd(musb->hcd); | |
2671 | } | |
2672 | ||
2cc65fea DM |
2673 | int musb_host_setup(struct musb *musb, int power_budget) |
2674 | { | |
2675 | int ret; | |
2676 | struct usb_hcd *hcd = musb->hcd; | |
2677 | ||
2678 | MUSB_HST_MODE(musb); | |
2679 | musb->xceiv->otg->default_a = 1; | |
2680 | musb->xceiv->state = OTG_STATE_A_IDLE; | |
2681 | ||
2682 | otg_set_host(musb->xceiv->otg, &hcd->self); | |
2683 | hcd->self.otg_port = 1; | |
2684 | musb->xceiv->otg->host = &hcd->self; | |
2685 | hcd->power_budget = 2 * (power_budget ? : 250); | |
2686 | ||
2687 | ret = usb_add_hcd(hcd, 0, 0); | |
2688 | if (ret < 0) | |
2689 | return ret; | |
2690 | ||
3c9740a1 | 2691 | device_wakeup_enable(hcd->self.controller); |
2cc65fea DM |
2692 | return 0; |
2693 | } | |
2694 | ||
0b3eba44 DM |
2695 | void musb_host_resume_root_hub(struct musb *musb) |
2696 | { | |
74c2e936 | 2697 | usb_hcd_resume_root_hub(musb->hcd); |
0b3eba44 DM |
2698 | } |
2699 | ||
2700 | void musb_host_poke_root_hub(struct musb *musb) | |
2701 | { | |
2702 | MUSB_HST_MODE(musb); | |
74c2e936 DM |
2703 | if (musb->hcd->status_urb) |
2704 | usb_hcd_poll_rh_status(musb->hcd); | |
0b3eba44 | 2705 | else |
74c2e936 | 2706 | usb_hcd_resume_root_hub(musb->hcd); |
0b3eba44 | 2707 | } |