1 /*
2 * TUSB6010 USB 2.0 OTG Dual Role controller OMAP DMA interface
3 *
4 * Copyright (C) 2006 Nokia Corporation
5 * Tony Lindgren <tony@atomide.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/init.h>
15 #include <linux/usb.h>
16 #include <linux/platform_device.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/slab.h>
19 #include <plat/dma.h>
20 #include <plat/mux.h>
21
22 #include "musb_core.h"
23 #include "tusb6010.h"
24
25 #define to_chdat(c) ((struct tusb_omap_dma_ch *)(c)->private_data)
26
27 #define MAX_DMAREQ 5 /* REVISIT: Really 6, but req5 not OK */
28
29 struct tusb_omap_dma_ch {
30 struct musb *musb;
31 void __iomem *tbase;
32 unsigned long phys_offset;
33 int epnum;
34 u8 tx;
35 struct musb_hw_ep *hw_ep;
36
37 int ch;
38 s8 dmareq;
39 s8 sync_dev;
40
41 struct tusb_omap_dma *tusb_dma;
42
43 dma_addr_t dma_addr;
44
45 u32 len;
46 u16 packet_sz;
47 u16 transfer_packet_sz;
48 u32 transfer_len;
49 u32 completed_len;
50 };
51
52 struct tusb_omap_dma {
53 struct dma_controller controller;
54 struct musb *musb;
55 void __iomem *tbase;
56
57 int ch;
58 s8 dmareq;
59 s8 sync_dev;
60 unsigned multichannel:1;
61 };
62
tusb_omap_dma_start(struct dma_controller * c)63 static int tusb_omap_dma_start(struct dma_controller *c)
64 {
65 struct tusb_omap_dma *tusb_dma;
66
67 tusb_dma = container_of(c, struct tusb_omap_dma, controller);
68
69 /* dev_dbg(musb->controller, "ep%i ch: %i\n", chdat->epnum, chdat->ch); */
70
71 return 0;
72 }
73
tusb_omap_dma_stop(struct dma_controller * c)74 static int tusb_omap_dma_stop(struct dma_controller *c)
75 {
76 struct tusb_omap_dma *tusb_dma;
77
78 tusb_dma = container_of(c, struct tusb_omap_dma, controller);
79
80 /* dev_dbg(musb->controller, "ep%i ch: %i\n", chdat->epnum, chdat->ch); */
81
82 return 0;
83 }
84
85 /*
86 * Allocate dmareq0 to the current channel unless it's already taken
87 */
tusb_omap_use_shared_dmareq(struct tusb_omap_dma_ch * chdat)88 static inline int tusb_omap_use_shared_dmareq(struct tusb_omap_dma_ch *chdat)
89 {
90 u32 reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
91
92 if (reg != 0) {
93 dev_dbg(chdat->musb->controller, "ep%i dmareq0 is busy for ep%i\n",
94 chdat->epnum, reg & 0xf);
95 return -EAGAIN;
96 }
97
98 if (chdat->tx)
99 reg = (1 << 4) | chdat->epnum;
100 else
101 reg = chdat->epnum;
102
103 musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg);
104
105 return 0;
106 }
107
tusb_omap_free_shared_dmareq(struct tusb_omap_dma_ch * chdat)108 static inline void tusb_omap_free_shared_dmareq(struct tusb_omap_dma_ch *chdat)
109 {
110 u32 reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
111
112 if ((reg & 0xf) != chdat->epnum) {
113 printk(KERN_ERR "ep%i trying to release dmareq0 for ep%i\n",
114 chdat->epnum, reg & 0xf);
115 return;
116 }
117 musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, 0);
118 }
119
120 /*
121 * See also musb_dma_completion in plat_uds.c and musb_g_[tx|rx]() in
122 * musb_gadget.c.
123 */
tusb_omap_dma_cb(int lch,u16 ch_status,void * data)124 static void tusb_omap_dma_cb(int lch, u16 ch_status, void *data)
125 {
126 struct dma_channel *channel = (struct dma_channel *)data;
127 struct tusb_omap_dma_ch *chdat = to_chdat(channel);
128 struct tusb_omap_dma *tusb_dma = chdat->tusb_dma;
129 struct musb *musb = chdat->musb;
130 struct device *dev = musb->controller;
131 struct musb_hw_ep *hw_ep = chdat->hw_ep;
132 void __iomem *ep_conf = hw_ep->conf;
133 void __iomem *mbase = musb->mregs;
134 unsigned long remaining, flags, pio;
135 int ch;
136
137 spin_lock_irqsave(&musb->lock, flags);
138
139 if (tusb_dma->multichannel)
140 ch = chdat->ch;
141 else
142 ch = tusb_dma->ch;
143
144 if (ch_status != OMAP_DMA_BLOCK_IRQ)
145 printk(KERN_ERR "TUSB DMA error status: %i\n", ch_status);
146
147 dev_dbg(musb->controller, "ep%i %s dma callback ch: %i status: %x\n",
148 chdat->epnum, chdat->tx ? "tx" : "rx",
149 ch, ch_status);
150
151 if (chdat->tx)
152 remaining = musb_readl(ep_conf, TUSB_EP_TX_OFFSET);
153 else
154 remaining = musb_readl(ep_conf, TUSB_EP_RX_OFFSET);
155
156 remaining = TUSB_EP_CONFIG_XFR_SIZE(remaining);
157
158 /* HW issue #10: XFR_SIZE may get corrupt on DMA (both async & sync) */
159 if (unlikely(remaining > chdat->transfer_len)) {
160 dev_dbg(musb->controller, "Corrupt %s dma ch%i XFR_SIZE: 0x%08lx\n",
161 chdat->tx ? "tx" : "rx", chdat->ch,
162 remaining);
163 remaining = 0;
164 }
165
166 channel->actual_len = chdat->transfer_len - remaining;
167 pio = chdat->len - channel->actual_len;
168
169 dev_dbg(musb->controller, "DMA remaining %lu/%u\n", remaining, chdat->transfer_len);
170
171 /* Transfer remaining 1 - 31 bytes */
172 if (pio > 0 && pio < 32) {
173 u8 *buf;
174
175 dev_dbg(musb->controller, "Using PIO for remaining %lu bytes\n", pio);
176 buf = phys_to_virt((u32)chdat->dma_addr) + chdat->transfer_len;
177 if (chdat->tx) {
178 dma_unmap_single(dev, chdat->dma_addr,
179 chdat->transfer_len,
180 DMA_TO_DEVICE);
181 musb_write_fifo(hw_ep, pio, buf);
182 } else {
183 dma_unmap_single(dev, chdat->dma_addr,
184 chdat->transfer_len,
185 DMA_FROM_DEVICE);
186 musb_read_fifo(hw_ep, pio, buf);
187 }
188 channel->actual_len += pio;
189 }
190
191 if (!tusb_dma->multichannel)
192 tusb_omap_free_shared_dmareq(chdat);
193
194 channel->status = MUSB_DMA_STATUS_FREE;
195
196 /* Handle only RX callbacks here. TX callbacks must be handled based
197 * on the TUSB DMA status interrupt.
198 * REVISIT: Use both TUSB DMA status interrupt and OMAP DMA callback
199 * interrupt for RX and TX.
200 */
201 if (!chdat->tx)
202 musb_dma_completion(musb, chdat->epnum, chdat->tx);
203
204 /* We must terminate short tx transfers manually by setting TXPKTRDY.
205 * REVISIT: This same problem may occur with other MUSB dma as well.
206 * Easy to test with g_ether by pinging the MUSB board with ping -s54.
207 */
208 if ((chdat->transfer_len < chdat->packet_sz)
209 || (chdat->transfer_len % chdat->packet_sz != 0)) {
210 u16 csr;
211
212 if (chdat->tx) {
213 dev_dbg(musb->controller, "terminating short tx packet\n");
214 musb_ep_select(mbase, chdat->epnum);
215 csr = musb_readw(hw_ep->regs, MUSB_TXCSR);
216 csr |= MUSB_TXCSR_MODE | MUSB_TXCSR_TXPKTRDY
217 | MUSB_TXCSR_P_WZC_BITS;
218 musb_writew(hw_ep->regs, MUSB_TXCSR, csr);
219 }
220 }
221
222 spin_unlock_irqrestore(&musb->lock, flags);
223 }
224
tusb_omap_dma_program(struct dma_channel * channel,u16 packet_sz,u8 rndis_mode,dma_addr_t dma_addr,u32 len)225 static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
226 u8 rndis_mode, dma_addr_t dma_addr, u32 len)
227 {
228 struct tusb_omap_dma_ch *chdat = to_chdat(channel);
229 struct tusb_omap_dma *tusb_dma = chdat->tusb_dma;
230 struct musb *musb = chdat->musb;
231 struct device *dev = musb->controller;
232 struct musb_hw_ep *hw_ep = chdat->hw_ep;
233 void __iomem *mbase = musb->mregs;
234 void __iomem *ep_conf = hw_ep->conf;
235 dma_addr_t fifo = hw_ep->fifo_sync;
236 struct omap_dma_channel_params dma_params;
237 u32 dma_remaining;
238 int src_burst, dst_burst;
239 u16 csr;
240 int ch;
241 s8 dmareq;
242 s8 sync_dev;
243
244 if (unlikely(dma_addr & 0x1) || (len < 32) || (len > packet_sz))
245 return false;
246
247 /*
248 * HW issue #10: Async dma will eventually corrupt the XFR_SIZE
249 * register which will cause missed DMA interrupt. We could try to
250 * use a timer for the callback, but it is unsafe as the XFR_SIZE
251 * register is corrupt, and we won't know if the DMA worked.
252 */
253 if (dma_addr & 0x2)
254 return false;
255
256 /*
257 * Because of HW issue #10, it seems like mixing sync DMA and async
258 * PIO access can confuse the DMA. Make sure XFR_SIZE is reset before
259 * using the channel for DMA.
260 */
261 if (chdat->tx)
262 dma_remaining = musb_readl(ep_conf, TUSB_EP_TX_OFFSET);
263 else
264 dma_remaining = musb_readl(ep_conf, TUSB_EP_RX_OFFSET);
265
266 dma_remaining = TUSB_EP_CONFIG_XFR_SIZE(dma_remaining);
267 if (dma_remaining) {
268 dev_dbg(musb->controller, "Busy %s dma ch%i, not using: %08x\n",
269 chdat->tx ? "tx" : "rx", chdat->ch,
270 dma_remaining);
271 return false;
272 }
273
274 chdat->transfer_len = len & ~0x1f;
275
276 if (len < packet_sz)
277 chdat->transfer_packet_sz = chdat->transfer_len;
278 else
279 chdat->transfer_packet_sz = packet_sz;
280
281 if (tusb_dma->multichannel) {
282 ch = chdat->ch;
283 dmareq = chdat->dmareq;
284 sync_dev = chdat->sync_dev;
285 } else {
286 if (tusb_omap_use_shared_dmareq(chdat) != 0) {
287 dev_dbg(musb->controller, "could not get dma for ep%i\n", chdat->epnum);
288 return false;
289 }
290 if (tusb_dma->ch < 0) {
291 /* REVISIT: This should get blocked earlier, happens
292 * with MSC ErrorRecoveryTest
293 */
294 WARN_ON(1);
295 return false;
296 }
297
298 ch = tusb_dma->ch;
299 dmareq = tusb_dma->dmareq;
300 sync_dev = tusb_dma->sync_dev;
301 omap_set_dma_callback(ch, tusb_omap_dma_cb, channel);
302 }
303
304 chdat->packet_sz = packet_sz;
305 chdat->len = len;
306 channel->actual_len = 0;
307 chdat->dma_addr = dma_addr;
308 channel->status = MUSB_DMA_STATUS_BUSY;
309
310 /* Since we're recycling dma areas, we need to clean or invalidate */
311 if (chdat->tx)
312 dma_map_single(dev, phys_to_virt(dma_addr), len,
313 DMA_TO_DEVICE);
314 else
315 dma_map_single(dev, phys_to_virt(dma_addr), len,
316 DMA_FROM_DEVICE);
317
318 /* Use 16-bit transfer if dma_addr is not 32-bit aligned */
319 if ((dma_addr & 0x3) == 0) {
320 dma_params.data_type = OMAP_DMA_DATA_TYPE_S32;
321 dma_params.elem_count = 8; /* Elements in frame */
322 } else {
323 dma_params.data_type = OMAP_DMA_DATA_TYPE_S16;
324 dma_params.elem_count = 16; /* Elements in frame */
325 fifo = hw_ep->fifo_async;
326 }
327
328 dma_params.frame_count = chdat->transfer_len / 32; /* Burst sz frame */
329
330 dev_dbg(musb->controller, "ep%i %s dma ch%i dma: %08x len: %u(%u) packet_sz: %i(%i)\n",
331 chdat->epnum, chdat->tx ? "tx" : "rx",
332 ch, dma_addr, chdat->transfer_len, len,
333 chdat->transfer_packet_sz, packet_sz);
334
335 /*
336 * Prepare omap DMA for transfer
337 */
338 if (chdat->tx) {
339 dma_params.src_amode = OMAP_DMA_AMODE_POST_INC;
340 dma_params.src_start = (unsigned long)dma_addr;
341 dma_params.src_ei = 0;
342 dma_params.src_fi = 0;
343
344 dma_params.dst_amode = OMAP_DMA_AMODE_DOUBLE_IDX;
345 dma_params.dst_start = (unsigned long)fifo;
346 dma_params.dst_ei = 1;
347 dma_params.dst_fi = -31; /* Loop 32 byte window */
348
349 dma_params.trigger = sync_dev;
350 dma_params.sync_mode = OMAP_DMA_SYNC_FRAME;
351 dma_params.src_or_dst_synch = 0; /* Dest sync */
352
353 src_burst = OMAP_DMA_DATA_BURST_16; /* 16x32 read */
354 dst_burst = OMAP_DMA_DATA_BURST_8; /* 8x32 write */
355 } else {
356 dma_params.src_amode = OMAP_DMA_AMODE_DOUBLE_IDX;
357 dma_params.src_start = (unsigned long)fifo;
358 dma_params.src_ei = 1;
359 dma_params.src_fi = -31; /* Loop 32 byte window */
360
361 dma_params.dst_amode = OMAP_DMA_AMODE_POST_INC;
362 dma_params.dst_start = (unsigned long)dma_addr;
363 dma_params.dst_ei = 0;
364 dma_params.dst_fi = 0;
365
366 dma_params.trigger = sync_dev;
367 dma_params.sync_mode = OMAP_DMA_SYNC_FRAME;
368 dma_params.src_or_dst_synch = 1; /* Source sync */
369
370 src_burst = OMAP_DMA_DATA_BURST_8; /* 8x32 read */
371 dst_burst = OMAP_DMA_DATA_BURST_16; /* 16x32 write */
372 }
373
374 dev_dbg(musb->controller, "ep%i %s using %i-bit %s dma from 0x%08lx to 0x%08lx\n",
375 chdat->epnum, chdat->tx ? "tx" : "rx",
376 (dma_params.data_type == OMAP_DMA_DATA_TYPE_S32) ? 32 : 16,
377 ((dma_addr & 0x3) == 0) ? "sync" : "async",
378 dma_params.src_start, dma_params.dst_start);
379
380 omap_set_dma_params(ch, &dma_params);
381 omap_set_dma_src_burst_mode(ch, src_burst);
382 omap_set_dma_dest_burst_mode(ch, dst_burst);
383 omap_set_dma_write_mode(ch, OMAP_DMA_WRITE_LAST_NON_POSTED);
384
385 /*
386 * Prepare MUSB for DMA transfer
387 */
388 if (chdat->tx) {
389 musb_ep_select(mbase, chdat->epnum);
390 csr = musb_readw(hw_ep->regs, MUSB_TXCSR);
391 csr |= (MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB
392 | MUSB_TXCSR_DMAMODE | MUSB_TXCSR_MODE);
393 csr &= ~MUSB_TXCSR_P_UNDERRUN;
394 musb_writew(hw_ep->regs, MUSB_TXCSR, csr);
395 } else {
396 musb_ep_select(mbase, chdat->epnum);
397 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
398 csr |= MUSB_RXCSR_DMAENAB;
399 csr &= ~(MUSB_RXCSR_AUTOCLEAR | MUSB_RXCSR_DMAMODE);
400 musb_writew(hw_ep->regs, MUSB_RXCSR,
401 csr | MUSB_RXCSR_P_WZC_BITS);
402 }
403
404 /*
405 * Start DMA transfer
406 */
407 omap_start_dma(ch);
408
409 if (chdat->tx) {
410 /* Send transfer_packet_sz packets at a time */
411 musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET,
412 chdat->transfer_packet_sz);
413
414 musb_writel(ep_conf, TUSB_EP_TX_OFFSET,
415 TUSB_EP_CONFIG_XFR_SIZE(chdat->transfer_len));
416 } else {
417 /* Receive transfer_packet_sz packets at a time */
418 musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET,
419 chdat->transfer_packet_sz << 16);
420
421 musb_writel(ep_conf, TUSB_EP_RX_OFFSET,
422 TUSB_EP_CONFIG_XFR_SIZE(chdat->transfer_len));
423 }
424
425 return true;
426 }
427
tusb_omap_dma_abort(struct dma_channel * channel)428 static int tusb_omap_dma_abort(struct dma_channel *channel)
429 {
430 struct tusb_omap_dma_ch *chdat = to_chdat(channel);
431 struct tusb_omap_dma *tusb_dma = chdat->tusb_dma;
432
433 if (!tusb_dma->multichannel) {
434 if (tusb_dma->ch >= 0) {
435 omap_stop_dma(tusb_dma->ch);
436 omap_free_dma(tusb_dma->ch);
437 tusb_dma->ch = -1;
438 }
439
440 tusb_dma->dmareq = -1;
441 tusb_dma->sync_dev = -1;
442 }
443
444 channel->status = MUSB_DMA_STATUS_FREE;
445
446 return 0;
447 }
448
tusb_omap_dma_allocate_dmareq(struct tusb_omap_dma_ch * chdat)449 static inline int tusb_omap_dma_allocate_dmareq(struct tusb_omap_dma_ch *chdat)
450 {
451 u32 reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
452 int i, dmareq_nr = -1;
453
454 const int sync_dev[6] = {
455 OMAP24XX_DMA_EXT_DMAREQ0,
456 OMAP24XX_DMA_EXT_DMAREQ1,
457 OMAP242X_DMA_EXT_DMAREQ2,
458 OMAP242X_DMA_EXT_DMAREQ3,
459 OMAP242X_DMA_EXT_DMAREQ4,
460 OMAP242X_DMA_EXT_DMAREQ5,
461 };
462
463 for (i = 0; i < MAX_DMAREQ; i++) {
464 int cur = (reg & (0xf << (i * 5))) >> (i * 5);
465 if (cur == 0) {
466 dmareq_nr = i;
467 break;
468 }
469 }
470
471 if (dmareq_nr == -1)
472 return -EAGAIN;
473
474 reg |= (chdat->epnum << (dmareq_nr * 5));
475 if (chdat->tx)
476 reg |= ((1 << 4) << (dmareq_nr * 5));
477 musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg);
478
479 chdat->dmareq = dmareq_nr;
480 chdat->sync_dev = sync_dev[chdat->dmareq];
481
482 return 0;
483 }
484
tusb_omap_dma_free_dmareq(struct tusb_omap_dma_ch * chdat)485 static inline void tusb_omap_dma_free_dmareq(struct tusb_omap_dma_ch *chdat)
486 {
487 u32 reg;
488
489 if (!chdat || chdat->dmareq < 0)
490 return;
491
492 reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
493 reg &= ~(0x1f << (chdat->dmareq * 5));
494 musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg);
495
496 chdat->dmareq = -1;
497 chdat->sync_dev = -1;
498 }
499
500 static struct dma_channel *dma_channel_pool[MAX_DMAREQ];
501
502 static struct dma_channel *
tusb_omap_dma_allocate(struct dma_controller * c,struct musb_hw_ep * hw_ep,u8 tx)503 tusb_omap_dma_allocate(struct dma_controller *c,
504 struct musb_hw_ep *hw_ep,
505 u8 tx)
506 {
507 int ret, i;
508 const char *dev_name;
509 struct tusb_omap_dma *tusb_dma;
510 struct musb *musb;
511 void __iomem *tbase;
512 struct dma_channel *channel = NULL;
513 struct tusb_omap_dma_ch *chdat = NULL;
514 u32 reg;
515
516 tusb_dma = container_of(c, struct tusb_omap_dma, controller);
517 musb = tusb_dma->musb;
518 tbase = musb->ctrl_base;
519
520 reg = musb_readl(tbase, TUSB_DMA_INT_MASK);
521 if (tx)
522 reg &= ~(1 << hw_ep->epnum);
523 else
524 reg &= ~(1 << (hw_ep->epnum + 15));
525 musb_writel(tbase, TUSB_DMA_INT_MASK, reg);
526
527 /* REVISIT: Why does dmareq5 not work? */
528 if (hw_ep->epnum == 0) {
529 dev_dbg(musb->controller, "Not allowing DMA for ep0 %s\n", tx ? "tx" : "rx");
530 return NULL;
531 }
532
533 for (i = 0; i < MAX_DMAREQ; i++) {
534 struct dma_channel *ch = dma_channel_pool[i];
535 if (ch->status == MUSB_DMA_STATUS_UNKNOWN) {
536 ch->status = MUSB_DMA_STATUS_FREE;
537 channel = ch;
538 chdat = ch->private_data;
539 break;
540 }
541 }
542
543 if (!channel)
544 return NULL;
545
546 if (tx) {
547 chdat->tx = 1;
548 dev_name = "TUSB transmit";
549 } else {
550 chdat->tx = 0;
551 dev_name = "TUSB receive";
552 }
553
554 chdat->musb = tusb_dma->musb;
555 chdat->tbase = tusb_dma->tbase;
556 chdat->hw_ep = hw_ep;
557 chdat->epnum = hw_ep->epnum;
558 chdat->dmareq = -1;
559 chdat->completed_len = 0;
560 chdat->tusb_dma = tusb_dma;
561
562 channel->max_len = 0x7fffffff;
563 channel->desired_mode = 0;
564 channel->actual_len = 0;
565
566 if (tusb_dma->multichannel) {
567 ret = tusb_omap_dma_allocate_dmareq(chdat);
568 if (ret != 0)
569 goto free_dmareq;
570
571 ret = omap_request_dma(chdat->sync_dev, dev_name,
572 tusb_omap_dma_cb, channel, &chdat->ch);
573 if (ret != 0)
574 goto free_dmareq;
575 } else if (tusb_dma->ch == -1) {
576 tusb_dma->dmareq = 0;
577 tusb_dma->sync_dev = OMAP24XX_DMA_EXT_DMAREQ0;
578
579 /* Callback data gets set later in the shared dmareq case */
580 ret = omap_request_dma(tusb_dma->sync_dev, "TUSB shared",
581 tusb_omap_dma_cb, NULL, &tusb_dma->ch);
582 if (ret != 0)
583 goto free_dmareq;
584
585 chdat->dmareq = -1;
586 chdat->ch = -1;
587 }
588
589 dev_dbg(musb->controller, "ep%i %s dma: %s dma%i dmareq%i sync%i\n",
590 chdat->epnum,
591 chdat->tx ? "tx" : "rx",
592 chdat->ch >= 0 ? "dedicated" : "shared",
593 chdat->ch >= 0 ? chdat->ch : tusb_dma->ch,
594 chdat->dmareq >= 0 ? chdat->dmareq : tusb_dma->dmareq,
595 chdat->sync_dev >= 0 ? chdat->sync_dev : tusb_dma->sync_dev);
596
597 return channel;
598
599 free_dmareq:
600 tusb_omap_dma_free_dmareq(chdat);
601
602 dev_dbg(musb->controller, "ep%i: Could not get a DMA channel\n", chdat->epnum);
603 channel->status = MUSB_DMA_STATUS_UNKNOWN;
604
605 return NULL;
606 }
607
tusb_omap_dma_release(struct dma_channel * channel)608 static void tusb_omap_dma_release(struct dma_channel *channel)
609 {
610 struct tusb_omap_dma_ch *chdat = to_chdat(channel);
611 struct musb *musb = chdat->musb;
612 void __iomem *tbase = musb->ctrl_base;
613 u32 reg;
614
615 dev_dbg(musb->controller, "ep%i ch%i\n", chdat->epnum, chdat->ch);
616
617 reg = musb_readl(tbase, TUSB_DMA_INT_MASK);
618 if (chdat->tx)
619 reg |= (1 << chdat->epnum);
620 else
621 reg |= (1 << (chdat->epnum + 15));
622 musb_writel(tbase, TUSB_DMA_INT_MASK, reg);
623
624 reg = musb_readl(tbase, TUSB_DMA_INT_CLEAR);
625 if (chdat->tx)
626 reg |= (1 << chdat->epnum);
627 else
628 reg |= (1 << (chdat->epnum + 15));
629 musb_writel(tbase, TUSB_DMA_INT_CLEAR, reg);
630
631 channel->status = MUSB_DMA_STATUS_UNKNOWN;
632
633 if (chdat->ch >= 0) {
634 omap_stop_dma(chdat->ch);
635 omap_free_dma(chdat->ch);
636 chdat->ch = -1;
637 }
638
639 if (chdat->dmareq >= 0)
640 tusb_omap_dma_free_dmareq(chdat);
641
642 channel = NULL;
643 }
644
dma_controller_destroy(struct dma_controller * c)645 void dma_controller_destroy(struct dma_controller *c)
646 {
647 struct tusb_omap_dma *tusb_dma;
648 int i;
649
650 tusb_dma = container_of(c, struct tusb_omap_dma, controller);
651 for (i = 0; i < MAX_DMAREQ; i++) {
652 struct dma_channel *ch = dma_channel_pool[i];
653 if (ch) {
654 kfree(ch->private_data);
655 kfree(ch);
656 }
657 }
658
659 if (tusb_dma && !tusb_dma->multichannel && tusb_dma->ch >= 0)
660 omap_free_dma(tusb_dma->ch);
661
662 kfree(tusb_dma);
663 }
664
665 struct dma_controller *__init
dma_controller_create(struct musb * musb,void __iomem * base)666 dma_controller_create(struct musb *musb, void __iomem *base)
667 {
668 void __iomem *tbase = musb->ctrl_base;
669 struct tusb_omap_dma *tusb_dma;
670 int i;
671
672 /* REVISIT: Get dmareq lines used from board-*.c */
673
674 musb_writel(musb->ctrl_base, TUSB_DMA_INT_MASK, 0x7fffffff);
675 musb_writel(musb->ctrl_base, TUSB_DMA_EP_MAP, 0);
676
677 musb_writel(tbase, TUSB_DMA_REQ_CONF,
678 TUSB_DMA_REQ_CONF_BURST_SIZE(2)
679 | TUSB_DMA_REQ_CONF_DMA_REQ_EN(0x3f)
680 | TUSB_DMA_REQ_CONF_DMA_REQ_ASSER(2));
681
682 tusb_dma = kzalloc(sizeof(struct tusb_omap_dma), GFP_KERNEL);
683 if (!tusb_dma)
684 goto out;
685
686 tusb_dma->musb = musb;
687 tusb_dma->tbase = musb->ctrl_base;
688
689 tusb_dma->ch = -1;
690 tusb_dma->dmareq = -1;
691 tusb_dma->sync_dev = -1;
692
693 tusb_dma->controller.start = tusb_omap_dma_start;
694 tusb_dma->controller.stop = tusb_omap_dma_stop;
695 tusb_dma->controller.channel_alloc = tusb_omap_dma_allocate;
696 tusb_dma->controller.channel_release = tusb_omap_dma_release;
697 tusb_dma->controller.channel_program = tusb_omap_dma_program;
698 tusb_dma->controller.channel_abort = tusb_omap_dma_abort;
699
700 if (tusb_get_revision(musb) >= TUSB_REV_30)
701 tusb_dma->multichannel = 1;
702
703 for (i = 0; i < MAX_DMAREQ; i++) {
704 struct dma_channel *ch;
705 struct tusb_omap_dma_ch *chdat;
706
707 ch = kzalloc(sizeof(struct dma_channel), GFP_KERNEL);
708 if (!ch)
709 goto cleanup;
710
711 dma_channel_pool[i] = ch;
712
713 chdat = kzalloc(sizeof(struct tusb_omap_dma_ch), GFP_KERNEL);
714 if (!chdat)
715 goto cleanup;
716
717 ch->status = MUSB_DMA_STATUS_UNKNOWN;
718 ch->private_data = chdat;
719 }
720
721 return &tusb_dma->controller;
722
723 cleanup:
724 dma_controller_destroy(&tusb_dma->controller);
725 out:
726 return NULL;
727 }
728