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mm-only debug patch...
[mmotm.git] / drivers / usb / musb / tusb6010_omap.c
blob7e073a0d7ac9b5428797d27857e883cd227d34f9
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 <mach/dma.h>
19 #include <mach/mux.h>
20
21 #include "musb_core.h"
22
23 #define to_chdat(c) ((struct tusb_omap_dma_ch *)(c)->private_data)
24
25 #define MAX_DMAREQ 5 /* REVISIT: Really 6, but req5 not OK */
26
27 struct tusb_omap_dma_ch {
28 struct musb *musb;
29 void __iomem *tbase;
30 unsigned long phys_offset;
31 int epnum;
32 u8 tx;
33 struct musb_hw_ep *hw_ep;
34
35 int ch;
36 s8 dmareq;
37 s8 sync_dev;
38
39 struct tusb_omap_dma *tusb_dma;
40
41 void __iomem *dma_addr;
42
43 u32 len;
44 u16 packet_sz;
45 u16 transfer_packet_sz;
46 u32 transfer_len;
47 u32 completed_len;
48 };
49
50 struct tusb_omap_dma {
51 struct dma_controller controller;
52 struct musb *musb;
53 void __iomem *tbase;
54
55 int ch;
56 s8 dmareq;
57 s8 sync_dev;
58 unsigned multichannel:1;
59 };
60
61 static int tusb_omap_dma_start(struct dma_controller *c)
62 {
63 struct tusb_omap_dma *tusb_dma;
64
65 tusb_dma = container_of(c, struct tusb_omap_dma, controller);
66
67 /* DBG(3, "ep%i ch: %i\n", chdat->epnum, chdat->ch); */
68
69 return 0;
70 }
71
72 static int tusb_omap_dma_stop(struct dma_controller *c)
73 {
74 struct tusb_omap_dma *tusb_dma;
75
76 tusb_dma = container_of(c, struct tusb_omap_dma, controller);
77
78 /* DBG(3, "ep%i ch: %i\n", chdat->epnum, chdat->ch); */
79
80 return 0;
81 }
82
83 /*
84 * Allocate dmareq0 to the current channel unless it's already taken
85 */
86 static inline int tusb_omap_use_shared_dmareq(struct tusb_omap_dma_ch *chdat)
87 {
88 u32 reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
89
90 if (reg != 0) {
91 DBG(3, "ep%i dmareq0 is busy for ep%i\n",
92 chdat->epnum, reg & 0xf);
93 return -EAGAIN;
94 }
95
96 if (chdat->tx)
97 reg = (1 << 4) | chdat->epnum;
98 else
99 reg = chdat->epnum;
100
101 musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg);
102
103 return 0;
104 }
105
106 static inline void tusb_omap_free_shared_dmareq(struct tusb_omap_dma_ch *chdat)
107 {
108 u32 reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
109
110 if ((reg & 0xf) != chdat->epnum) {
111 printk(KERN_ERR "ep%i trying to release dmareq0 for ep%i\n",
112 chdat->epnum, reg & 0xf);
113 return;
114 }
115 musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, 0);
116 }
117
118 /*
119 * See also musb_dma_completion in plat_uds.c and musb_g_[tx|rx]() in
120 * musb_gadget.c.
121 */
122 static void tusb_omap_dma_cb(int lch, u16 ch_status, void *data)
123 {
124 struct dma_channel *channel = (struct dma_channel *)data;
125 struct tusb_omap_dma_ch *chdat = to_chdat(channel);
126 struct tusb_omap_dma *tusb_dma = chdat->tusb_dma;
127 struct musb *musb = chdat->musb;
128 struct musb_hw_ep *hw_ep = chdat->hw_ep;
129 void __iomem *ep_conf = hw_ep->conf;
130 void __iomem *mbase = musb->mregs;
131 unsigned long remaining, flags, pio;
132 int ch;
133
134 spin_lock_irqsave(&musb->lock, flags);
135
136 if (tusb_dma->multichannel)
137 ch = chdat->ch;
138 else
139 ch = tusb_dma->ch;
140
141 if (ch_status != OMAP_DMA_BLOCK_IRQ)
142 printk(KERN_ERR "TUSB DMA error status: %i\n", ch_status);
143
144 DBG(3, "ep%i %s dma callback ch: %i status: %x\n",
145 chdat->epnum, chdat->tx ? "tx" : "rx",
146 ch, ch_status);
147
148 if (chdat->tx)
149 remaining = musb_readl(ep_conf, TUSB_EP_TX_OFFSET);
150 else
151 remaining = musb_readl(ep_conf, TUSB_EP_RX_OFFSET);
152
153 remaining = TUSB_EP_CONFIG_XFR_SIZE(remaining);
154
155 /* HW issue #10: XFR_SIZE may get corrupt on DMA (both async & sync) */
156 if (unlikely(remaining > chdat->transfer_len)) {
157 DBG(2, "Corrupt %s dma ch%i XFR_SIZE: 0x%08lx\n",
158 chdat->tx ? "tx" : "rx", chdat->ch,
159 remaining);
160 remaining = 0;
161 }
162
163 channel->actual_len = chdat->transfer_len - remaining;
164 pio = chdat->len - channel->actual_len;
165
166 DBG(3, "DMA remaining %lu/%u\n", remaining, chdat->transfer_len);
167
168 /* Transfer remaining 1 - 31 bytes */
169 if (pio > 0 && pio < 32) {
170 u8 *buf;
171
172 DBG(3, "Using PIO for remaining %lu bytes\n", pio);
173 buf = phys_to_virt((u32)chdat->dma_addr) + chdat->transfer_len;
174 if (chdat->tx) {
175 dma_cache_maint(phys_to_virt((u32)chdat->dma_addr),
176 chdat->transfer_len, DMA_TO_DEVICE);
177 musb_write_fifo(hw_ep, pio, buf);
178 } else {
179 musb_read_fifo(hw_ep, pio, buf);
180 dma_cache_maint(phys_to_virt((u32)chdat->dma_addr),
181 chdat->transfer_len, DMA_FROM_DEVICE);
182 }
183 channel->actual_len += pio;
184 }
185
186 if (!tusb_dma->multichannel)
187 tusb_omap_free_shared_dmareq(chdat);
188
189 channel->status = MUSB_DMA_STATUS_FREE;
190
191 /* Handle only RX callbacks here. TX callbacks must be handled based
192 * on the TUSB DMA status interrupt.
193 * REVISIT: Use both TUSB DMA status interrupt and OMAP DMA callback
194 * interrupt for RX and TX.
195 */
196 if (!chdat->tx)
197 musb_dma_completion(musb, chdat->epnum, chdat->tx);
198
199 /* We must terminate short tx transfers manually by setting TXPKTRDY.
200 * REVISIT: This same problem may occur with other MUSB dma as well.
201 * Easy to test with g_ether by pinging the MUSB board with ping -s54.
202 */
203 if ((chdat->transfer_len < chdat->packet_sz)
204 || (chdat->transfer_len % chdat->packet_sz != 0)) {
205 u16 csr;
206
207 if (chdat->tx) {
208 DBG(3, "terminating short tx packet\n");
209 musb_ep_select(mbase, chdat->epnum);
210 csr = musb_readw(hw_ep->regs, MUSB_TXCSR);
211 csr |= MUSB_TXCSR_MODE | MUSB_TXCSR_TXPKTRDY
212 | MUSB_TXCSR_P_WZC_BITS;
213 musb_writew(hw_ep->regs, MUSB_TXCSR, csr);
214 }
215 }
216
217 spin_unlock_irqrestore(&musb->lock, flags);
218 }
219
220 static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
221 u8 rndis_mode, dma_addr_t dma_addr, u32 len)
222 {
223 struct tusb_omap_dma_ch *chdat = to_chdat(channel);
224 struct tusb_omap_dma *tusb_dma = chdat->tusb_dma;
225 struct musb *musb = chdat->musb;
226 struct musb_hw_ep *hw_ep = chdat->hw_ep;
227 void __iomem *mbase = musb->mregs;
228 void __iomem *ep_conf = hw_ep->conf;
229 dma_addr_t fifo = hw_ep->fifo_sync;
230 struct omap_dma_channel_params dma_params;
231 u32 dma_remaining;
232 int src_burst, dst_burst;
233 u16 csr;
234 int ch;
235 s8 dmareq;
236 s8 sync_dev;
237
238 if (unlikely(dma_addr & 0x1) || (len < 32) || (len > packet_sz))
239 return false;
240
241 /*
242 * HW issue #10: Async dma will eventually corrupt the XFR_SIZE
243 * register which will cause missed DMA interrupt. We could try to
244 * use a timer for the callback, but it is unsafe as the XFR_SIZE
245 * register is corrupt, and we won't know if the DMA worked.
246 */
247 if (dma_addr & 0x2)
248 return false;
249
250 /*
251 * Because of HW issue #10, it seems like mixing sync DMA and async
252 * PIO access can confuse the DMA. Make sure XFR_SIZE is reset before
253 * using the channel for DMA.
254 */
255 if (chdat->tx)
256 dma_remaining = musb_readl(ep_conf, TUSB_EP_TX_OFFSET);
257 else
258 dma_remaining = musb_readl(ep_conf, TUSB_EP_RX_OFFSET);
259
260 dma_remaining = TUSB_EP_CONFIG_XFR_SIZE(dma_remaining);
261 if (dma_remaining) {
262 DBG(2, "Busy %s dma ch%i, not using: %08x\n",
263 chdat->tx ? "tx" : "rx", chdat->ch,
264 dma_remaining);
265 return false;
266 }
267
268 chdat->transfer_len = len & ~0x1f;
269
270 if (len < packet_sz)
271 chdat->transfer_packet_sz = chdat->transfer_len;
272 else
273 chdat->transfer_packet_sz = packet_sz;
274
275 if (tusb_dma->multichannel) {
276 ch = chdat->ch;
277 dmareq = chdat->dmareq;
278 sync_dev = chdat->sync_dev;
279 } else {
280 if (tusb_omap_use_shared_dmareq(chdat) != 0) {
281 DBG(3, "could not get dma for ep%i\n", chdat->epnum);
282 return false;
283 }
284 if (tusb_dma->ch < 0) {
285 /* REVISIT: This should get blocked earlier, happens
286 * with MSC ErrorRecoveryTest
287 */
288 WARN_ON(1);
289 return false;
290 }
291
292 ch = tusb_dma->ch;
293 dmareq = tusb_dma->dmareq;
294 sync_dev = tusb_dma->sync_dev;
295 omap_set_dma_callback(ch, tusb_omap_dma_cb, channel);
296 }
297
298 chdat->packet_sz = packet_sz;
299 chdat->len = len;
300 channel->actual_len = 0;
301 chdat->dma_addr = (void __iomem *)dma_addr;
302 channel->status = MUSB_DMA_STATUS_BUSY;
303
304 /* Since we're recycling dma areas, we need to clean or invalidate */
305 if (chdat->tx)
306 dma_cache_maint(phys_to_virt(dma_addr), len, DMA_TO_DEVICE);
307 else
308 dma_cache_maint(phys_to_virt(dma_addr), len, DMA_FROM_DEVICE);
309
310 /* Use 16-bit transfer if dma_addr is not 32-bit aligned */
311 if ((dma_addr & 0x3) == 0) {
312 dma_params.data_type = OMAP_DMA_DATA_TYPE_S32;
313 dma_params.elem_count = 8; /* Elements in frame */
314 } else {
315 dma_params.data_type = OMAP_DMA_DATA_TYPE_S16;
316 dma_params.elem_count = 16; /* Elements in frame */
317 fifo = hw_ep->fifo_async;
318 }
319
320 dma_params.frame_count = chdat->transfer_len / 32; /* Burst sz frame */
321
322 DBG(3, "ep%i %s dma ch%i dma: %08x len: %u(%u) packet_sz: %i(%i)\n",
323 chdat->epnum, chdat->tx ? "tx" : "rx",
324 ch, dma_addr, chdat->transfer_len, len,
325 chdat->transfer_packet_sz, packet_sz);
326
327 /*
328 * Prepare omap DMA for transfer
329 */
330 if (chdat->tx) {
331 dma_params.src_amode = OMAP_DMA_AMODE_POST_INC;
332 dma_params.src_start = (unsigned long)dma_addr;
333 dma_params.src_ei = 0;
334 dma_params.src_fi = 0;
335
336 dma_params.dst_amode = OMAP_DMA_AMODE_DOUBLE_IDX;
337 dma_params.dst_start = (unsigned long)fifo;
338 dma_params.dst_ei = 1;
339 dma_params.dst_fi = -31; /* Loop 32 byte window */
340
341 dma_params.trigger = sync_dev;
342 dma_params.sync_mode = OMAP_DMA_SYNC_FRAME;
343 dma_params.src_or_dst_synch = 0; /* Dest sync */
344
345 src_burst = OMAP_DMA_DATA_BURST_16; /* 16x32 read */
346 dst_burst = OMAP_DMA_DATA_BURST_8; /* 8x32 write */
347 } else {
348 dma_params.src_amode = OMAP_DMA_AMODE_DOUBLE_IDX;
349 dma_params.src_start = (unsigned long)fifo;
350 dma_params.src_ei = 1;
351 dma_params.src_fi = -31; /* Loop 32 byte window */
352
353 dma_params.dst_amode = OMAP_DMA_AMODE_POST_INC;
354 dma_params.dst_start = (unsigned long)dma_addr;
355 dma_params.dst_ei = 0;
356 dma_params.dst_fi = 0;
357
358 dma_params.trigger = sync_dev;
359 dma_params.sync_mode = OMAP_DMA_SYNC_FRAME;
360 dma_params.src_or_dst_synch = 1; /* Source sync */
361
362 src_burst = OMAP_DMA_DATA_BURST_8; /* 8x32 read */
363 dst_burst = OMAP_DMA_DATA_BURST_16; /* 16x32 write */
364 }
365
366 DBG(3, "ep%i %s using %i-bit %s dma from 0x%08lx to 0x%08lx\n",
367 chdat->epnum, chdat->tx ? "tx" : "rx",
368 (dma_params.data_type == OMAP_DMA_DATA_TYPE_S32) ? 32 : 16,
369 ((dma_addr & 0x3) == 0) ? "sync" : "async",
370 dma_params.src_start, dma_params.dst_start);
371
372 omap_set_dma_params(ch, &dma_params);
373 omap_set_dma_src_burst_mode(ch, src_burst);
374 omap_set_dma_dest_burst_mode(ch, dst_burst);
375 omap_set_dma_write_mode(ch, OMAP_DMA_WRITE_LAST_NON_POSTED);
376
377 /*
378 * Prepare MUSB for DMA transfer
379 */
380 if (chdat->tx) {
381 musb_ep_select(mbase, chdat->epnum);
382 csr = musb_readw(hw_ep->regs, MUSB_TXCSR);
383 csr |= (MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB
384 | MUSB_TXCSR_DMAMODE | MUSB_TXCSR_MODE);
385 csr &= ~MUSB_TXCSR_P_UNDERRUN;
386 musb_writew(hw_ep->regs, MUSB_TXCSR, csr);
387 } else {
388 musb_ep_select(mbase, chdat->epnum);
389 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
390 csr |= MUSB_RXCSR_DMAENAB;
391 csr &= ~(MUSB_RXCSR_AUTOCLEAR | MUSB_RXCSR_DMAMODE);
392 musb_writew(hw_ep->regs, MUSB_RXCSR,
393 csr | MUSB_RXCSR_P_WZC_BITS);
394 }
395
396 /*
397 * Start DMA transfer
398 */
399 omap_start_dma(ch);
400
401 if (chdat->tx) {
402 /* Send transfer_packet_sz packets at a time */
403 musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET,
404 chdat->transfer_packet_sz);
405
406 musb_writel(ep_conf, TUSB_EP_TX_OFFSET,
407 TUSB_EP_CONFIG_XFR_SIZE(chdat->transfer_len));
408 } else {
409 /* Receive transfer_packet_sz packets at a time */
410 musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET,
411 chdat->transfer_packet_sz << 16);
412
413 musb_writel(ep_conf, TUSB_EP_RX_OFFSET,
414 TUSB_EP_CONFIG_XFR_SIZE(chdat->transfer_len));
415 }
416
417 return true;
418 }
419
420 static int tusb_omap_dma_abort(struct dma_channel *channel)
421 {
422 struct tusb_omap_dma_ch *chdat = to_chdat(channel);
423 struct tusb_omap_dma *tusb_dma = chdat->tusb_dma;
424
425 if (!tusb_dma->multichannel) {
426 if (tusb_dma->ch >= 0) {
427 omap_stop_dma(tusb_dma->ch);
428 omap_free_dma(tusb_dma->ch);
429 tusb_dma->ch = -1;
430 }
431
432 tusb_dma->dmareq = -1;
433 tusb_dma->sync_dev = -1;
434 }
435
436 channel->status = MUSB_DMA_STATUS_FREE;
437
438 return 0;
439 }
440
441 static inline int tusb_omap_dma_allocate_dmareq(struct tusb_omap_dma_ch *chdat)
442 {
443 u32 reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
444 int i, dmareq_nr = -1;
445
446 const int sync_dev[6] = {
447 OMAP24XX_DMA_EXT_DMAREQ0,
448 OMAP24XX_DMA_EXT_DMAREQ1,
449 OMAP242X_DMA_EXT_DMAREQ2,
450 OMAP242X_DMA_EXT_DMAREQ3,
451 OMAP242X_DMA_EXT_DMAREQ4,
452 OMAP242X_DMA_EXT_DMAREQ5,
453 };
454
455 for (i = 0; i < MAX_DMAREQ; i++) {
456 int cur = (reg & (0xf << (i * 5))) >> (i * 5);
457 if (cur == 0) {
458 dmareq_nr = i;
459 break;
460 }
461 }
462
463 if (dmareq_nr == -1)
464 return -EAGAIN;
465
466 reg |= (chdat->epnum << (dmareq_nr * 5));
467 if (chdat->tx)
468 reg |= ((1 << 4) << (dmareq_nr * 5));
469 musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg);
470
471 chdat->dmareq = dmareq_nr;
472 chdat->sync_dev = sync_dev[chdat->dmareq];
473
474 return 0;
475 }
476
477 static inline void tusb_omap_dma_free_dmareq(struct tusb_omap_dma_ch *chdat)
478 {
479 u32 reg;
480
481 if (!chdat || chdat->dmareq < 0)
482 return;
483
484 reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
485 reg &= ~(0x1f << (chdat->dmareq * 5));
486 musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg);
487
488 chdat->dmareq = -1;
489 chdat->sync_dev = -1;
490 }
491
492 static struct dma_channel *dma_channel_pool[MAX_DMAREQ];
493
494 static struct dma_channel *
495 tusb_omap_dma_allocate(struct dma_controller *c,
496 struct musb_hw_ep *hw_ep,
497 u8 tx)
498 {
499 int ret, i;
500 const char *dev_name;
501 struct tusb_omap_dma *tusb_dma;
502 struct musb *musb;
503 void __iomem *tbase;
504 struct dma_channel *channel = NULL;
505 struct tusb_omap_dma_ch *chdat = NULL;
506 u32 reg;
507
508 tusb_dma = container_of(c, struct tusb_omap_dma, controller);
509 musb = tusb_dma->musb;
510 tbase = musb->ctrl_base;
511
512 reg = musb_readl(tbase, TUSB_DMA_INT_MASK);
513 if (tx)
514 reg &= ~(1 << hw_ep->epnum);
515 else
516 reg &= ~(1 << (hw_ep->epnum + 15));
517 musb_writel(tbase, TUSB_DMA_INT_MASK, reg);
518
519 /* REVISIT: Why does dmareq5 not work? */
520 if (hw_ep->epnum == 0) {
521 DBG(3, "Not allowing DMA for ep0 %s\n", tx ? "tx" : "rx");
522 return NULL;
523 }
524
525 for (i = 0; i < MAX_DMAREQ; i++) {
526 struct dma_channel *ch = dma_channel_pool[i];
527 if (ch->status == MUSB_DMA_STATUS_UNKNOWN) {
528 ch->status = MUSB_DMA_STATUS_FREE;
529 channel = ch;
530 chdat = ch->private_data;
531 break;
532 }
533 }
534
535 if (!channel)
536 return NULL;
537
538 if (tx) {
539 chdat->tx = 1;
540 dev_name = "TUSB transmit";
541 } else {
542 chdat->tx = 0;
543 dev_name = "TUSB receive";
544 }
545
546 chdat->musb = tusb_dma->musb;
547 chdat->tbase = tusb_dma->tbase;
548 chdat->hw_ep = hw_ep;
549 chdat->epnum = hw_ep->epnum;
550 chdat->dmareq = -1;
551 chdat->completed_len = 0;
552 chdat->tusb_dma = tusb_dma;
553
554 channel->max_len = 0x7fffffff;
555 channel->desired_mode = 0;
556 channel->actual_len = 0;
557
558 if (tusb_dma->multichannel) {
559 ret = tusb_omap_dma_allocate_dmareq(chdat);
560 if (ret != 0)
561 goto free_dmareq;
562
563 ret = omap_request_dma(chdat->sync_dev, dev_name,
564 tusb_omap_dma_cb, channel, &chdat->ch);
565 if (ret != 0)
566 goto free_dmareq;
567 } else if (tusb_dma->ch == -1) {
568 tusb_dma->dmareq = 0;
569 tusb_dma->sync_dev = OMAP24XX_DMA_EXT_DMAREQ0;
570
571 /* Callback data gets set later in the shared dmareq case */
572 ret = omap_request_dma(tusb_dma->sync_dev, "TUSB shared",
573 tusb_omap_dma_cb, NULL, &tusb_dma->ch);
574 if (ret != 0)
575 goto free_dmareq;
576
577 chdat->dmareq = -1;
578 chdat->ch = -1;
579 }
580
581 DBG(3, "ep%i %s dma: %s dma%i dmareq%i sync%i\n",
582 chdat->epnum,
583 chdat->tx ? "tx" : "rx",
584 chdat->ch >= 0 ? "dedicated" : "shared",
585 chdat->ch >= 0 ? chdat->ch : tusb_dma->ch,
586 chdat->dmareq >= 0 ? chdat->dmareq : tusb_dma->dmareq,
587 chdat->sync_dev >= 0 ? chdat->sync_dev : tusb_dma->sync_dev);
588
589 return channel;
590
591 free_dmareq:
592 tusb_omap_dma_free_dmareq(chdat);
593
594 DBG(3, "ep%i: Could not get a DMA channel\n", chdat->epnum);
595 channel->status = MUSB_DMA_STATUS_UNKNOWN;
596
597 return NULL;
598 }
599
600 static void tusb_omap_dma_release(struct dma_channel *channel)
601 {
602 struct tusb_omap_dma_ch *chdat = to_chdat(channel);
603 struct musb *musb = chdat->musb;
604 void __iomem *tbase = musb->ctrl_base;
605 u32 reg;
606
607 DBG(3, "ep%i ch%i\n", chdat->epnum, chdat->ch);
608
609 reg = musb_readl(tbase, TUSB_DMA_INT_MASK);
610 if (chdat->tx)
611 reg |= (1 << chdat->epnum);
612 else
613 reg |= (1 << (chdat->epnum + 15));
614 musb_writel(tbase, TUSB_DMA_INT_MASK, reg);
615
616 reg = musb_readl(tbase, TUSB_DMA_INT_CLEAR);
617 if (chdat->tx)
618 reg |= (1 << chdat->epnum);
619 else
620 reg |= (1 << (chdat->epnum + 15));
621 musb_writel(tbase, TUSB_DMA_INT_CLEAR, reg);
622
623 channel->status = MUSB_DMA_STATUS_UNKNOWN;
624
625 if (chdat->ch >= 0) {
626 omap_stop_dma(chdat->ch);
627 omap_free_dma(chdat->ch);
628 chdat->ch = -1;
629 }
630
631 if (chdat->dmareq >= 0)
632 tusb_omap_dma_free_dmareq(chdat);
633
634 channel = NULL;
635 }
636
637 void dma_controller_destroy(struct dma_controller *c)
638 {
639 struct tusb_omap_dma *tusb_dma;
640 int i;
641
642 tusb_dma = container_of(c, struct tusb_omap_dma, controller);
643 for (i = 0; i < MAX_DMAREQ; i++) {
644 struct dma_channel *ch = dma_channel_pool[i];
645 if (ch) {
646 kfree(ch->private_data);
647 kfree(ch);
648 }
649 }
650
651 if (!tusb_dma->multichannel && tusb_dma && tusb_dma->ch >= 0)
652 omap_free_dma(tusb_dma->ch);
653
654 kfree(tusb_dma);
655 }
656
657 struct dma_controller *__init
658 dma_controller_create(struct musb *musb, void __iomem *base)
659 {
660 void __iomem *tbase = musb->ctrl_base;
661 struct tusb_omap_dma *tusb_dma;
662 int i;
663
664 /* REVISIT: Get dmareq lines used from board-*.c */
665
666 musb_writel(musb->ctrl_base, TUSB_DMA_INT_MASK, 0x7fffffff);
667 musb_writel(musb->ctrl_base, TUSB_DMA_EP_MAP, 0);
668
669 musb_writel(tbase, TUSB_DMA_REQ_CONF,
670 TUSB_DMA_REQ_CONF_BURST_SIZE(2)
671 | TUSB_DMA_REQ_CONF_DMA_REQ_EN(0x3f)
672 | TUSB_DMA_REQ_CONF_DMA_REQ_ASSER(2));
673
674 tusb_dma = kzalloc(sizeof(struct tusb_omap_dma), GFP_KERNEL);
675 if (!tusb_dma)
676 goto cleanup;
677
678 tusb_dma->musb = musb;
679 tusb_dma->tbase = musb->ctrl_base;
680
681 tusb_dma->ch = -1;
682 tusb_dma->dmareq = -1;
683 tusb_dma->sync_dev = -1;
684
685 tusb_dma->controller.start = tusb_omap_dma_start;
686 tusb_dma->controller.stop = tusb_omap_dma_stop;
687 tusb_dma->controller.channel_alloc = tusb_omap_dma_allocate;
688 tusb_dma->controller.channel_release = tusb_omap_dma_release;
689 tusb_dma->controller.channel_program = tusb_omap_dma_program;
690 tusb_dma->controller.channel_abort = tusb_omap_dma_abort;
691
692 if (tusb_get_revision(musb) >= TUSB_REV_30)
693 tusb_dma->multichannel = 1;
694
695 for (i = 0; i < MAX_DMAREQ; i++) {
696 struct dma_channel *ch;
697 struct tusb_omap_dma_ch *chdat;
698
699 ch = kzalloc(sizeof(struct dma_channel), GFP_KERNEL);
700 if (!ch)
701 goto cleanup;
702
703 dma_channel_pool[i] = ch;
704
705 chdat = kzalloc(sizeof(struct tusb_omap_dma_ch), GFP_KERNEL);
706 if (!chdat)
707 goto cleanup;
708
709 ch->status = MUSB_DMA_STATUS_UNKNOWN;
710 ch->private_data = chdat;
711 }
712
713 return &tusb_dma->controller;
714
715 cleanup:
716 dma_controller_destroy(&tusb_dma->controller);
717
718 return NULL;
719 }
mm of the moment repository