1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/device.h>
3 #include <linux/dma-mapping.h>
4 #include <linux/dmaengine.h>
5 #include <linux/sizes.h>
6 #include <linux/platform_device.h>
7 #include <linux/of.h>
8
9 #include "cppi_dma.h"
10 #include "musb_core.h"
11 #include "musb_trace.h"
12
13 #define RNDIS_REG(x) (0x80 + ((x - 1) * 4))
14
15 #define EP_MODE_AUTOREQ_NONE 0
16 #define EP_MODE_AUTOREQ_ALL_NEOP 1
17 #define EP_MODE_AUTOREQ_ALWAYS 3
18
19 #define EP_MODE_DMA_TRANSPARENT 0
20 #define EP_MODE_DMA_RNDIS 1
21 #define EP_MODE_DMA_GEN_RNDIS 3
22
23 #define USB_CTRL_TX_MODE 0x70
24 #define USB_CTRL_RX_MODE 0x74
25 #define USB_CTRL_AUTOREQ 0xd0
26 #define USB_TDOWN 0xd8
27
28 #define MUSB_DMA_NUM_CHANNELS 15
29
30 #define DA8XX_USB_MODE 0x10
31 #define DA8XX_USB_AUTOREQ 0x14
32 #define DA8XX_USB_TEARDOWN 0x1c
33
34 #define DA8XX_DMA_NUM_CHANNELS 4
35
36 struct cppi41_dma_controller {
37 struct dma_controller controller;
38 struct cppi41_dma_channel *rx_channel;
39 struct cppi41_dma_channel *tx_channel;
40 struct hrtimer early_tx;
41 struct list_head early_tx_list;
42 u32 rx_mode;
43 u32 tx_mode;
44 u32 auto_req;
45
46 u32 tdown_reg;
47 u32 autoreq_reg;
48
49 void (*set_dma_mode)(struct cppi41_dma_channel *cppi41_channel,
50 unsigned int mode);
51 u8 num_channels;
52 };
53
save_rx_toggle(struct cppi41_dma_channel * cppi41_channel)54 static void save_rx_toggle(struct cppi41_dma_channel *cppi41_channel)
55 {
56 u16 csr;
57 u8 toggle;
58
59 if (cppi41_channel->is_tx)
60 return;
61 if (!is_host_active(cppi41_channel->controller->controller.musb))
62 return;
63
64 csr = musb_readw(cppi41_channel->hw_ep->regs, MUSB_RXCSR);
65 toggle = csr & MUSB_RXCSR_H_DATATOGGLE ? 1 : 0;
66
67 cppi41_channel->usb_toggle = toggle;
68 }
69
update_rx_toggle(struct cppi41_dma_channel * cppi41_channel)70 static void update_rx_toggle(struct cppi41_dma_channel *cppi41_channel)
71 {
72 struct musb_hw_ep *hw_ep = cppi41_channel->hw_ep;
73 struct musb *musb = hw_ep->musb;
74 u16 csr;
75 u8 toggle;
76
77 if (cppi41_channel->is_tx)
78 return;
79 if (!is_host_active(musb))
80 return;
81
82 musb_ep_select(musb->mregs, hw_ep->epnum);
83 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
84 toggle = csr & MUSB_RXCSR_H_DATATOGGLE ? 1 : 0;
85
86 /*
87 * AM335x Advisory 1.0.13: Due to internal synchronisation error the
88 * data toggle may reset from DATA1 to DATA0 during receiving data from
89 * more than one endpoint.
90 */
91 if (!toggle && toggle == cppi41_channel->usb_toggle) {
92 csr |= MUSB_RXCSR_H_DATATOGGLE | MUSB_RXCSR_H_WR_DATATOGGLE;
93 musb_writew(cppi41_channel->hw_ep->regs, MUSB_RXCSR, csr);
94 musb_dbg(musb, "Restoring DATA1 toggle.");
95 }
96
97 cppi41_channel->usb_toggle = toggle;
98 }
99
musb_is_tx_fifo_empty(struct musb_hw_ep * hw_ep)100 static bool musb_is_tx_fifo_empty(struct musb_hw_ep *hw_ep)
101 {
102 u8 epnum = hw_ep->epnum;
103 struct musb *musb = hw_ep->musb;
104 void __iomem *epio = musb->endpoints[epnum].regs;
105 u16 csr;
106
107 musb_ep_select(musb->mregs, hw_ep->epnum);
108 csr = musb_readw(epio, MUSB_TXCSR);
109 if (csr & MUSB_TXCSR_TXPKTRDY)
110 return false;
111 return true;
112 }
113
114 static void cppi41_dma_callback(void *private_data,
115 const struct dmaengine_result *result);
116
cppi41_trans_done(struct cppi41_dma_channel * cppi41_channel)117 static void cppi41_trans_done(struct cppi41_dma_channel *cppi41_channel)
118 {
119 struct musb_hw_ep *hw_ep = cppi41_channel->hw_ep;
120 struct musb *musb = hw_ep->musb;
121 void __iomem *epio = hw_ep->regs;
122 u16 csr;
123
124 if (!cppi41_channel->prog_len ||
125 (cppi41_channel->channel.status == MUSB_DMA_STATUS_FREE)) {
126
127 /* done, complete */
128 cppi41_channel->channel.actual_len =
129 cppi41_channel->transferred;
130 cppi41_channel->channel.status = MUSB_DMA_STATUS_FREE;
131 cppi41_channel->channel.rx_packet_done = true;
132
133 /*
134 * transmit ZLP using PIO mode for transfers which size is
135 * multiple of EP packet size.
136 */
137 if (cppi41_channel->tx_zlp && (cppi41_channel->transferred %
138 cppi41_channel->packet_sz) == 0) {
139 musb_ep_select(musb->mregs, hw_ep->epnum);
140 csr = MUSB_TXCSR_MODE | MUSB_TXCSR_TXPKTRDY;
141 musb_writew(epio, MUSB_TXCSR, csr);
142 }
143
144 trace_musb_cppi41_done(cppi41_channel);
145 musb_dma_completion(musb, hw_ep->epnum, cppi41_channel->is_tx);
146 } else {
147 /* next iteration, reload */
148 struct dma_chan *dc = cppi41_channel->dc;
149 struct dma_async_tx_descriptor *dma_desc;
150 enum dma_transfer_direction direction;
151 u32 remain_bytes;
152
153 cppi41_channel->buf_addr += cppi41_channel->packet_sz;
154
155 remain_bytes = cppi41_channel->total_len;
156 remain_bytes -= cppi41_channel->transferred;
157 remain_bytes = min(remain_bytes, cppi41_channel->packet_sz);
158 cppi41_channel->prog_len = remain_bytes;
159
160 direction = cppi41_channel->is_tx ? DMA_MEM_TO_DEV
161 : DMA_DEV_TO_MEM;
162 dma_desc = dmaengine_prep_slave_single(dc,
163 cppi41_channel->buf_addr,
164 remain_bytes,
165 direction,
166 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
167 if (WARN_ON(!dma_desc))
168 return;
169
170 dma_desc->callback_result = cppi41_dma_callback;
171 dma_desc->callback_param = &cppi41_channel->channel;
172 cppi41_channel->cookie = dma_desc->tx_submit(dma_desc);
173 trace_musb_cppi41_cont(cppi41_channel);
174 dma_async_issue_pending(dc);
175
176 if (!cppi41_channel->is_tx) {
177 musb_ep_select(musb->mregs, hw_ep->epnum);
178 csr = musb_readw(epio, MUSB_RXCSR);
179 csr |= MUSB_RXCSR_H_REQPKT;
180 musb_writew(epio, MUSB_RXCSR, csr);
181 }
182 }
183 }
184
cppi41_recheck_tx_req(struct hrtimer * timer)185 static enum hrtimer_restart cppi41_recheck_tx_req(struct hrtimer *timer)
186 {
187 struct cppi41_dma_controller *controller;
188 struct cppi41_dma_channel *cppi41_channel, *n;
189 struct musb *musb;
190 unsigned long flags;
191 enum hrtimer_restart ret = HRTIMER_NORESTART;
192
193 controller = container_of(timer, struct cppi41_dma_controller,
194 early_tx);
195 musb = controller->controller.musb;
196
197 spin_lock_irqsave(&musb->lock, flags);
198 list_for_each_entry_safe(cppi41_channel, n, &controller->early_tx_list,
199 tx_check) {
200 bool empty;
201 struct musb_hw_ep *hw_ep = cppi41_channel->hw_ep;
202
203 empty = musb_is_tx_fifo_empty(hw_ep);
204 if (empty) {
205 list_del_init(&cppi41_channel->tx_check);
206 cppi41_trans_done(cppi41_channel);
207 }
208 }
209
210 if (!list_empty(&controller->early_tx_list) &&
211 !hrtimer_is_queued(&controller->early_tx)) {
212 ret = HRTIMER_RESTART;
213 hrtimer_forward_now(&controller->early_tx, 20 * NSEC_PER_USEC);
214 }
215
216 spin_unlock_irqrestore(&musb->lock, flags);
217 return ret;
218 }
219
cppi41_dma_callback(void * private_data,const struct dmaengine_result * result)220 static void cppi41_dma_callback(void *private_data,
221 const struct dmaengine_result *result)
222 {
223 struct dma_channel *channel = private_data;
224 struct cppi41_dma_channel *cppi41_channel = channel->private_data;
225 struct musb_hw_ep *hw_ep = cppi41_channel->hw_ep;
226 struct cppi41_dma_controller *controller;
227 struct musb *musb = hw_ep->musb;
228 unsigned long flags;
229 struct dma_tx_state txstate;
230 u32 transferred;
231 int is_hs = 0;
232 bool empty;
233
234 controller = cppi41_channel->controller;
235 if (controller->controller.dma_callback)
236 controller->controller.dma_callback(&controller->controller);
237
238 if (result->result == DMA_TRANS_ABORTED)
239 return;
240
241 spin_lock_irqsave(&musb->lock, flags);
242
243 dmaengine_tx_status(cppi41_channel->dc, cppi41_channel->cookie,
244 &txstate);
245 transferred = cppi41_channel->prog_len - txstate.residue;
246 cppi41_channel->transferred += transferred;
247
248 trace_musb_cppi41_gb(cppi41_channel);
249 update_rx_toggle(cppi41_channel);
250
251 if (cppi41_channel->transferred == cppi41_channel->total_len ||
252 transferred < cppi41_channel->packet_sz)
253 cppi41_channel->prog_len = 0;
254
255 if (cppi41_channel->is_tx) {
256 u8 type;
257
258 if (is_host_active(musb))
259 type = hw_ep->out_qh->type;
260 else
261 type = hw_ep->ep_in.type;
262
263 if (type == USB_ENDPOINT_XFER_ISOC)
264 /*
265 * Don't use the early-TX-interrupt workaround below
266 * for Isoch transfter. Since Isoch are periodic
267 * transfer, by the time the next transfer is
268 * scheduled, the current one should be done already.
269 *
270 * This avoids audio playback underrun issue.
271 */
272 empty = true;
273 else
274 empty = musb_is_tx_fifo_empty(hw_ep);
275 }
276
277 if (!cppi41_channel->is_tx || empty) {
278 cppi41_trans_done(cppi41_channel);
279 goto out;
280 }
281
282 /*
283 * On AM335x it has been observed that the TX interrupt fires
284 * too early that means the TXFIFO is not yet empty but the DMA
285 * engine says that it is done with the transfer. We don't
286 * receive a FIFO empty interrupt so the only thing we can do is
287 * to poll for the bit. On HS it usually takes 2us, on FS around
288 * 110us - 150us depending on the transfer size.
289 * We spin on HS (no longer than 25us and setup a timer on
290 * FS to check for the bit and complete the transfer.
291 */
292 if (is_host_active(musb)) {
293 if (musb->port1_status & USB_PORT_STAT_HIGH_SPEED)
294 is_hs = 1;
295 } else {
296 if (musb->g.speed == USB_SPEED_HIGH)
297 is_hs = 1;
298 }
299 if (is_hs) {
300 unsigned wait = 25;
301
302 do {
303 empty = musb_is_tx_fifo_empty(hw_ep);
304 if (empty) {
305 cppi41_trans_done(cppi41_channel);
306 goto out;
307 }
308 wait--;
309 if (!wait)
310 break;
311 cpu_relax();
312 } while (1);
313 }
314 list_add_tail(&cppi41_channel->tx_check,
315 &controller->early_tx_list);
316 if (!hrtimer_is_queued(&controller->early_tx)) {
317 unsigned long usecs = cppi41_channel->total_len / 10;
318
319 hrtimer_start_range_ns(&controller->early_tx,
320 usecs * NSEC_PER_USEC,
321 20 * NSEC_PER_USEC,
322 HRTIMER_MODE_REL);
323 }
324
325 out:
326 spin_unlock_irqrestore(&musb->lock, flags);
327 }
328
update_ep_mode(unsigned ep,unsigned mode,u32 old)329 static u32 update_ep_mode(unsigned ep, unsigned mode, u32 old)
330 {
331 unsigned shift;
332
333 shift = (ep - 1) * 2;
334 old &= ~(3 << shift);
335 old |= mode << shift;
336 return old;
337 }
338
cppi41_set_dma_mode(struct cppi41_dma_channel * cppi41_channel,unsigned mode)339 static void cppi41_set_dma_mode(struct cppi41_dma_channel *cppi41_channel,
340 unsigned mode)
341 {
342 struct cppi41_dma_controller *controller = cppi41_channel->controller;
343 struct musb *musb = controller->controller.musb;
344 u32 port;
345 u32 new_mode;
346 u32 old_mode;
347
348 if (cppi41_channel->is_tx)
349 old_mode = controller->tx_mode;
350 else
351 old_mode = controller->rx_mode;
352 port = cppi41_channel->port_num;
353 new_mode = update_ep_mode(port, mode, old_mode);
354
355 if (new_mode == old_mode)
356 return;
357 if (cppi41_channel->is_tx) {
358 controller->tx_mode = new_mode;
359 musb_writel(musb->ctrl_base, USB_CTRL_TX_MODE, new_mode);
360 } else {
361 controller->rx_mode = new_mode;
362 musb_writel(musb->ctrl_base, USB_CTRL_RX_MODE, new_mode);
363 }
364 }
365
da8xx_set_dma_mode(struct cppi41_dma_channel * cppi41_channel,unsigned int mode)366 static void da8xx_set_dma_mode(struct cppi41_dma_channel *cppi41_channel,
367 unsigned int mode)
368 {
369 struct cppi41_dma_controller *controller = cppi41_channel->controller;
370 struct musb *musb = controller->controller.musb;
371 unsigned int shift;
372 u32 port;
373 u32 new_mode;
374 u32 old_mode;
375
376 old_mode = controller->tx_mode;
377 port = cppi41_channel->port_num;
378
379 shift = (port - 1) * 4;
380 if (!cppi41_channel->is_tx)
381 shift += 16;
382 new_mode = old_mode & ~(3 << shift);
383 new_mode |= mode << shift;
384
385 if (new_mode == old_mode)
386 return;
387 controller->tx_mode = new_mode;
388 musb_writel(musb->ctrl_base, DA8XX_USB_MODE, new_mode);
389 }
390
391
cppi41_set_autoreq_mode(struct cppi41_dma_channel * cppi41_channel,unsigned mode)392 static void cppi41_set_autoreq_mode(struct cppi41_dma_channel *cppi41_channel,
393 unsigned mode)
394 {
395 struct cppi41_dma_controller *controller = cppi41_channel->controller;
396 u32 port;
397 u32 new_mode;
398 u32 old_mode;
399
400 old_mode = controller->auto_req;
401 port = cppi41_channel->port_num;
402 new_mode = update_ep_mode(port, mode, old_mode);
403
404 if (new_mode == old_mode)
405 return;
406 controller->auto_req = new_mode;
407 musb_writel(controller->controller.musb->ctrl_base,
408 controller->autoreq_reg, new_mode);
409 }
410
cppi41_configure_channel(struct dma_channel * channel,u16 packet_sz,u8 mode,dma_addr_t dma_addr,u32 len)411 static bool cppi41_configure_channel(struct dma_channel *channel,
412 u16 packet_sz, u8 mode,
413 dma_addr_t dma_addr, u32 len)
414 {
415 struct cppi41_dma_channel *cppi41_channel = channel->private_data;
416 struct cppi41_dma_controller *controller = cppi41_channel->controller;
417 struct dma_chan *dc = cppi41_channel->dc;
418 struct dma_async_tx_descriptor *dma_desc;
419 enum dma_transfer_direction direction;
420 struct musb *musb = cppi41_channel->controller->controller.musb;
421 unsigned use_gen_rndis = 0;
422
423 cppi41_channel->buf_addr = dma_addr;
424 cppi41_channel->total_len = len;
425 cppi41_channel->transferred = 0;
426 cppi41_channel->packet_sz = packet_sz;
427 cppi41_channel->tx_zlp = (cppi41_channel->is_tx && mode) ? 1 : 0;
428
429 /*
430 * Due to AM335x' Advisory 1.0.13 we are not allowed to transfer more
431 * than max packet size at a time.
432 */
433 if (cppi41_channel->is_tx)
434 use_gen_rndis = 1;
435
436 if (use_gen_rndis) {
437 /* RNDIS mode */
438 if (len > packet_sz) {
439 musb_writel(musb->ctrl_base,
440 RNDIS_REG(cppi41_channel->port_num), len);
441 /* gen rndis */
442 controller->set_dma_mode(cppi41_channel,
443 EP_MODE_DMA_GEN_RNDIS);
444
445 /* auto req */
446 cppi41_set_autoreq_mode(cppi41_channel,
447 EP_MODE_AUTOREQ_ALL_NEOP);
448 } else {
449 musb_writel(musb->ctrl_base,
450 RNDIS_REG(cppi41_channel->port_num), 0);
451 controller->set_dma_mode(cppi41_channel,
452 EP_MODE_DMA_TRANSPARENT);
453 cppi41_set_autoreq_mode(cppi41_channel,
454 EP_MODE_AUTOREQ_NONE);
455 }
456 } else {
457 /* fallback mode */
458 controller->set_dma_mode(cppi41_channel,
459 EP_MODE_DMA_TRANSPARENT);
460 cppi41_set_autoreq_mode(cppi41_channel, EP_MODE_AUTOREQ_NONE);
461 len = min_t(u32, packet_sz, len);
462 }
463 cppi41_channel->prog_len = len;
464 direction = cppi41_channel->is_tx ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
465 dma_desc = dmaengine_prep_slave_single(dc, dma_addr, len, direction,
466 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
467 if (!dma_desc)
468 return false;
469
470 dma_desc->callback_result = cppi41_dma_callback;
471 dma_desc->callback_param = channel;
472 cppi41_channel->cookie = dma_desc->tx_submit(dma_desc);
473 cppi41_channel->channel.rx_packet_done = false;
474
475 trace_musb_cppi41_config(cppi41_channel);
476
477 save_rx_toggle(cppi41_channel);
478 dma_async_issue_pending(dc);
479 return true;
480 }
481
cppi41_dma_channel_allocate(struct dma_controller * c,struct musb_hw_ep * hw_ep,u8 is_tx)482 static struct dma_channel *cppi41_dma_channel_allocate(struct dma_controller *c,
483 struct musb_hw_ep *hw_ep, u8 is_tx)
484 {
485 struct cppi41_dma_controller *controller = container_of(c,
486 struct cppi41_dma_controller, controller);
487 struct cppi41_dma_channel *cppi41_channel = NULL;
488 u8 ch_num = hw_ep->epnum - 1;
489
490 if (ch_num >= controller->num_channels)
491 return NULL;
492
493 if (is_tx)
494 cppi41_channel = &controller->tx_channel[ch_num];
495 else
496 cppi41_channel = &controller->rx_channel[ch_num];
497
498 if (!cppi41_channel->dc)
499 return NULL;
500
501 if (cppi41_channel->is_allocated)
502 return NULL;
503
504 cppi41_channel->hw_ep = hw_ep;
505 cppi41_channel->is_allocated = 1;
506
507 trace_musb_cppi41_alloc(cppi41_channel);
508 return &cppi41_channel->channel;
509 }
510
cppi41_dma_channel_release(struct dma_channel * channel)511 static void cppi41_dma_channel_release(struct dma_channel *channel)
512 {
513 struct cppi41_dma_channel *cppi41_channel = channel->private_data;
514
515 trace_musb_cppi41_free(cppi41_channel);
516 if (cppi41_channel->is_allocated) {
517 cppi41_channel->is_allocated = 0;
518 channel->status = MUSB_DMA_STATUS_FREE;
519 channel->actual_len = 0;
520 }
521 }
522
cppi41_dma_channel_program(struct dma_channel * channel,u16 packet_sz,u8 mode,dma_addr_t dma_addr,u32 len)523 static int cppi41_dma_channel_program(struct dma_channel *channel,
524 u16 packet_sz, u8 mode,
525 dma_addr_t dma_addr, u32 len)
526 {
527 int ret;
528 struct cppi41_dma_channel *cppi41_channel = channel->private_data;
529 int hb_mult = 0;
530
531 BUG_ON(channel->status == MUSB_DMA_STATUS_UNKNOWN ||
532 channel->status == MUSB_DMA_STATUS_BUSY);
533
534 if (is_host_active(cppi41_channel->controller->controller.musb)) {
535 if (cppi41_channel->is_tx)
536 hb_mult = cppi41_channel->hw_ep->out_qh->hb_mult;
537 else
538 hb_mult = cppi41_channel->hw_ep->in_qh->hb_mult;
539 }
540
541 channel->status = MUSB_DMA_STATUS_BUSY;
542 channel->actual_len = 0;
543
544 if (hb_mult)
545 packet_sz = hb_mult * (packet_sz & 0x7FF);
546
547 ret = cppi41_configure_channel(channel, packet_sz, mode, dma_addr, len);
548 if (!ret)
549 channel->status = MUSB_DMA_STATUS_FREE;
550
551 return ret;
552 }
553
cppi41_is_compatible(struct dma_channel * channel,u16 maxpacket,void * buf,u32 length)554 static int cppi41_is_compatible(struct dma_channel *channel, u16 maxpacket,
555 void *buf, u32 length)
556 {
557 struct cppi41_dma_channel *cppi41_channel = channel->private_data;
558 struct cppi41_dma_controller *controller = cppi41_channel->controller;
559 struct musb *musb = controller->controller.musb;
560
561 if (is_host_active(musb)) {
562 WARN_ON(1);
563 return 1;
564 }
565 if (cppi41_channel->hw_ep->ep_in.type != USB_ENDPOINT_XFER_BULK)
566 return 0;
567 if (cppi41_channel->is_tx)
568 return 1;
569 /* AM335x Advisory 1.0.13. No workaround for device RX mode */
570 return 0;
571 }
572
cppi41_dma_channel_abort(struct dma_channel * channel)573 static int cppi41_dma_channel_abort(struct dma_channel *channel)
574 {
575 struct cppi41_dma_channel *cppi41_channel = channel->private_data;
576 struct cppi41_dma_controller *controller = cppi41_channel->controller;
577 struct musb *musb = controller->controller.musb;
578 void __iomem *epio = cppi41_channel->hw_ep->regs;
579 int tdbit;
580 int ret;
581 unsigned is_tx;
582 u16 csr;
583
584 is_tx = cppi41_channel->is_tx;
585 trace_musb_cppi41_abort(cppi41_channel);
586
587 if (cppi41_channel->channel.status == MUSB_DMA_STATUS_FREE)
588 return 0;
589
590 list_del_init(&cppi41_channel->tx_check);
591 if (is_tx) {
592 csr = musb_readw(epio, MUSB_TXCSR);
593 csr &= ~MUSB_TXCSR_DMAENAB;
594 musb_writew(epio, MUSB_TXCSR, csr);
595 } else {
596 cppi41_set_autoreq_mode(cppi41_channel, EP_MODE_AUTOREQ_NONE);
597
598 /* delay to drain to cppi dma pipeline for isoch */
599 udelay(250);
600
601 csr = musb_readw(epio, MUSB_RXCSR);
602 csr &= ~(MUSB_RXCSR_H_REQPKT | MUSB_RXCSR_DMAENAB);
603 musb_writew(epio, MUSB_RXCSR, csr);
604
605 /* wait to drain cppi dma pipe line */
606 udelay(50);
607
608 csr = musb_readw(epio, MUSB_RXCSR);
609 if (csr & MUSB_RXCSR_RXPKTRDY) {
610 csr |= MUSB_RXCSR_FLUSHFIFO;
611 musb_writew(epio, MUSB_RXCSR, csr);
612 musb_writew(epio, MUSB_RXCSR, csr);
613 }
614 }
615
616 /* DA8xx Advisory 2.3.27: wait 250 ms before to start the teardown */
617 if (musb->ops->quirks & MUSB_DA8XX)
618 mdelay(250);
619
620 tdbit = 1 << cppi41_channel->port_num;
621 if (is_tx)
622 tdbit <<= 16;
623
624 do {
625 if (is_tx)
626 musb_writel(musb->ctrl_base, controller->tdown_reg,
627 tdbit);
628 ret = dmaengine_terminate_all(cppi41_channel->dc);
629 } while (ret == -EAGAIN);
630
631 if (is_tx) {
632 musb_writel(musb->ctrl_base, controller->tdown_reg, tdbit);
633
634 csr = musb_readw(epio, MUSB_TXCSR);
635 if (csr & MUSB_TXCSR_TXPKTRDY) {
636 csr |= MUSB_TXCSR_FLUSHFIFO;
637 musb_writew(epio, MUSB_TXCSR, csr);
638 }
639 }
640
641 cppi41_channel->channel.status = MUSB_DMA_STATUS_FREE;
642 return 0;
643 }
644
cppi41_release_all_dma_chans(struct cppi41_dma_controller * ctrl)645 static void cppi41_release_all_dma_chans(struct cppi41_dma_controller *ctrl)
646 {
647 struct dma_chan *dc;
648 int i;
649
650 for (i = 0; i < ctrl->num_channels; i++) {
651 dc = ctrl->tx_channel[i].dc;
652 if (dc)
653 dma_release_channel(dc);
654 dc = ctrl->rx_channel[i].dc;
655 if (dc)
656 dma_release_channel(dc);
657 }
658 }
659
cppi41_dma_controller_stop(struct cppi41_dma_controller * controller)660 static void cppi41_dma_controller_stop(struct cppi41_dma_controller *controller)
661 {
662 cppi41_release_all_dma_chans(controller);
663 }
664
cppi41_dma_controller_start(struct cppi41_dma_controller * controller)665 static int cppi41_dma_controller_start(struct cppi41_dma_controller *controller)
666 {
667 struct musb *musb = controller->controller.musb;
668 struct device *dev = musb->controller;
669 struct device_node *np = dev->parent->of_node;
670 struct cppi41_dma_channel *cppi41_channel;
671 int count;
672 int i;
673 int ret;
674
675 count = of_property_count_strings(np, "dma-names");
676 if (count < 0)
677 return count;
678
679 for (i = 0; i < count; i++) {
680 struct dma_chan *dc;
681 struct dma_channel *musb_dma;
682 const char *str;
683 unsigned is_tx;
684 unsigned int port;
685
686 ret = of_property_read_string_index(np, "dma-names", i, &str);
687 if (ret)
688 goto err;
689 if (strstarts(str, "tx"))
690 is_tx = 1;
691 else if (strstarts(str, "rx"))
692 is_tx = 0;
693 else {
694 dev_err(dev, "Wrong dmatype %s\n", str);
695 goto err;
696 }
697 ret = kstrtouint(str + 2, 0, &port);
698 if (ret)
699 goto err;
700
701 ret = -EINVAL;
702 if (port > controller->num_channels || !port)
703 goto err;
704 if (is_tx)
705 cppi41_channel = &controller->tx_channel[port - 1];
706 else
707 cppi41_channel = &controller->rx_channel[port - 1];
708
709 cppi41_channel->controller = controller;
710 cppi41_channel->port_num = port;
711 cppi41_channel->is_tx = is_tx;
712 INIT_LIST_HEAD(&cppi41_channel->tx_check);
713
714 musb_dma = &cppi41_channel->channel;
715 musb_dma->private_data = cppi41_channel;
716 musb_dma->status = MUSB_DMA_STATUS_FREE;
717 musb_dma->max_len = SZ_4M;
718
719 dc = dma_request_chan(dev->parent, str);
720 if (IS_ERR(dc)) {
721 ret = dev_err_probe(dev, PTR_ERR(dc),
722 "Failed to request %s.\n", str);
723 goto err;
724 }
725
726 cppi41_channel->dc = dc;
727 }
728 return 0;
729 err:
730 cppi41_release_all_dma_chans(controller);
731 return ret;
732 }
733
cppi41_dma_controller_destroy(struct dma_controller * c)734 void cppi41_dma_controller_destroy(struct dma_controller *c)
735 {
736 struct cppi41_dma_controller *controller = container_of(c,
737 struct cppi41_dma_controller, controller);
738
739 hrtimer_cancel(&controller->early_tx);
740 cppi41_dma_controller_stop(controller);
741 kfree(controller->rx_channel);
742 kfree(controller->tx_channel);
743 kfree(controller);
744 }
745 EXPORT_SYMBOL_GPL(cppi41_dma_controller_destroy);
746
747 struct dma_controller *
cppi41_dma_controller_create(struct musb * musb,void __iomem * base)748 cppi41_dma_controller_create(struct musb *musb, void __iomem *base)
749 {
750 struct cppi41_dma_controller *controller;
751 int channel_size;
752 int ret = 0;
753
754 if (!musb->controller->parent->of_node) {
755 dev_err(musb->controller, "Need DT for the DMA engine.\n");
756 return NULL;
757 }
758
759 controller = kzalloc(sizeof(*controller), GFP_KERNEL);
760 if (!controller)
761 goto kzalloc_fail;
762
763 hrtimer_init(&controller->early_tx, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
764 controller->early_tx.function = cppi41_recheck_tx_req;
765 INIT_LIST_HEAD(&controller->early_tx_list);
766
767 controller->controller.channel_alloc = cppi41_dma_channel_allocate;
768 controller->controller.channel_release = cppi41_dma_channel_release;
769 controller->controller.channel_program = cppi41_dma_channel_program;
770 controller->controller.channel_abort = cppi41_dma_channel_abort;
771 controller->controller.is_compatible = cppi41_is_compatible;
772 controller->controller.musb = musb;
773
774 if (musb->ops->quirks & MUSB_DA8XX) {
775 controller->tdown_reg = DA8XX_USB_TEARDOWN;
776 controller->autoreq_reg = DA8XX_USB_AUTOREQ;
777 controller->set_dma_mode = da8xx_set_dma_mode;
778 controller->num_channels = DA8XX_DMA_NUM_CHANNELS;
779 } else {
780 controller->tdown_reg = USB_TDOWN;
781 controller->autoreq_reg = USB_CTRL_AUTOREQ;
782 controller->set_dma_mode = cppi41_set_dma_mode;
783 controller->num_channels = MUSB_DMA_NUM_CHANNELS;
784 }
785
786 channel_size = controller->num_channels *
787 sizeof(struct cppi41_dma_channel);
788 controller->rx_channel = kzalloc(channel_size, GFP_KERNEL);
789 if (!controller->rx_channel)
790 goto rx_channel_alloc_fail;
791 controller->tx_channel = kzalloc(channel_size, GFP_KERNEL);
792 if (!controller->tx_channel)
793 goto tx_channel_alloc_fail;
794
795 ret = cppi41_dma_controller_start(controller);
796 if (ret)
797 goto plat_get_fail;
798 return &controller->controller;
799
800 plat_get_fail:
801 kfree(controller->tx_channel);
802 tx_channel_alloc_fail:
803 kfree(controller->rx_channel);
804 rx_channel_alloc_fail:
805 kfree(controller);
806 kzalloc_fail:
807 if (ret == -EPROBE_DEFER)
808 return ERR_PTR(ret);
809 return NULL;
810 }
811 EXPORT_SYMBOL_GPL(cppi41_dma_controller_create);
812