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proc: use seq_puts()/seq_putc() where possible
[linux-2.6/next.git] / drivers / usb / musb / tusb6010_omap.c
blobc061a88f2b0f96199656f725382209ade44680f9
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
24 #define to_chdat(c) ((struct tusb_omap_dma_ch *)(c)->private_data)
25
26 #define MAX_DMAREQ 5 /* REVISIT: Really 6, but req5 not OK */
27
28 struct tusb_omap_dma_ch {
29 struct musb *musb;
30 void __iomem *tbase;
31 unsigned long phys_offset;
32 int epnum;
33 u8 tx;
34 struct musb_hw_ep *hw_ep;
35
36 int ch;
37 s8 dmareq;
38 s8 sync_dev;
39
40 struct tusb_omap_dma *tusb_dma;
41
42 dma_addr_t dma_addr;
43
44 u32 len;
45 u16 packet_sz;
46 u16 transfer_packet_sz;
47 u32 transfer_len;
48 u32 completed_len;
49 };
50
51 struct tusb_omap_dma {
52 struct dma_controller controller;
53 struct musb *musb;
54 void __iomem *tbase;
55
56 int ch;
57 s8 dmareq;
58 s8 sync_dev;
59 unsigned multichannel:1;
60 };
61
62 static int tusb_omap_dma_start(struct dma_controller *c)
63 {
64 struct tusb_omap_dma *tusb_dma;
65
66 tusb_dma = container_of(c, struct tusb_omap_dma, controller);
67
68 /* DBG(3, "ep%i ch: %i\n", chdat->epnum, chdat->ch); */
69
70 return 0;
71 }
72
73 static int tusb_omap_dma_stop(struct dma_controller *c)
74 {
75 struct tusb_omap_dma *tusb_dma;
76
77 tusb_dma = container_of(c, struct tusb_omap_dma, controller);
78
79 /* DBG(3, "ep%i ch: %i\n", chdat->epnum, chdat->ch); */
80
81 return 0;
82 }
83
84 /*
85 * Allocate dmareq0 to the current channel unless it's already taken
86 */
87 static inline int tusb_omap_use_shared_dmareq(struct tusb_omap_dma_ch *chdat)
88 {
89 u32 reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
90
91 if (reg != 0) {
92 DBG(3, "ep%i dmareq0 is busy for ep%i\n",
93 chdat->epnum, reg & 0xf);
94 return -EAGAIN;
95 }
96
97 if (chdat->tx)
98 reg = (1 << 4) | chdat->epnum;
99 else
100 reg = chdat->epnum;
101
102 musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg);
103
104 return 0;
105 }
106
107 static inline void tusb_omap_free_shared_dmareq(struct tusb_omap_dma_ch *chdat)
108 {
109 u32 reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
110
111 if ((reg & 0xf) != chdat->epnum) {
112 printk(KERN_ERR "ep%i trying to release dmareq0 for ep%i\n",
113 chdat->epnum, reg & 0xf);
114 return;
115 }
116 musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, 0);
117 }
118
119 /*
120 * See also musb_dma_completion in plat_uds.c and musb_g_[tx|rx]() in
121 * musb_gadget.c.
122 */
123 static void tusb_omap_dma_cb(int lch, u16 ch_status, void *data)
124 {
125 struct dma_channel *channel = (struct dma_channel *)data;
126 struct tusb_omap_dma_ch *chdat = to_chdat(channel);
127 struct tusb_omap_dma *tusb_dma = chdat->tusb_dma;
128 struct musb *musb = chdat->musb;
129 struct device *dev = musb->controller;
130 struct musb_hw_ep *hw_ep = chdat->hw_ep;
131 void __iomem *ep_conf = hw_ep->conf;
132 void __iomem *mbase = musb->mregs;
133 unsigned long remaining, flags, pio;
134 int ch;
135
136 spin_lock_irqsave(&musb->lock, flags);
137
138 if (tusb_dma->multichannel)
139 ch = chdat->ch;
140 else
141 ch = tusb_dma->ch;
142
143 if (ch_status != OMAP_DMA_BLOCK_IRQ)
144 printk(KERN_ERR "TUSB DMA error status: %i\n", ch_status);
145
146 DBG(3, "ep%i %s dma callback ch: %i status: %x\n",
147 chdat->epnum, chdat->tx ? "tx" : "rx",
148 ch, ch_status);
149
150 if (chdat->tx)
151 remaining = musb_readl(ep_conf, TUSB_EP_TX_OFFSET);
152 else
153 remaining = musb_readl(ep_conf, TUSB_EP_RX_OFFSET);
154
155 remaining = TUSB_EP_CONFIG_XFR_SIZE(remaining);
156
157 /* HW issue #10: XFR_SIZE may get corrupt on DMA (both async & sync) */
158 if (unlikely(remaining > chdat->transfer_len)) {
159 DBG(2, "Corrupt %s dma ch%i XFR_SIZE: 0x%08lx\n",
160 chdat->tx ? "tx" : "rx", chdat->ch,
161 remaining);
162 remaining = 0;
163 }
164
165 channel->actual_len = chdat->transfer_len - remaining;
166 pio = chdat->len - channel->actual_len;
167
168 DBG(3, "DMA remaining %lu/%u\n", remaining, chdat->transfer_len);
169
170 /* Transfer remaining 1 - 31 bytes */
171 if (pio > 0 && pio < 32) {
172 u8 *buf;
173
174 DBG(3, "Using PIO for remaining %lu bytes\n", pio);
175 buf = phys_to_virt((u32)chdat->dma_addr) + chdat->transfer_len;
176 if (chdat->tx) {
177 dma_unmap_single(dev, chdat->dma_addr,
178 chdat->transfer_len,
179 DMA_TO_DEVICE);
180 musb_write_fifo(hw_ep, pio, buf);
181 } else {
182 dma_unmap_single(dev, chdat->dma_addr,
183 chdat->transfer_len,
184 DMA_FROM_DEVICE);
185 musb_read_fifo(hw_ep, pio, buf);
186 }
187 channel->actual_len += pio;
188 }
189
190 if (!tusb_dma->multichannel)
191 tusb_omap_free_shared_dmareq(chdat);
192
193 channel->status = MUSB_DMA_STATUS_FREE;
194
195 /* Handle only RX callbacks here. TX callbacks must be handled based
196 * on the TUSB DMA status interrupt.
197 * REVISIT: Use both TUSB DMA status interrupt and OMAP DMA callback
198 * interrupt for RX and TX.
199 */
200 if (!chdat->tx)
201 musb_dma_completion(musb, chdat->epnum, chdat->tx);
202
203 /* We must terminate short tx transfers manually by setting TXPKTRDY.
204 * REVISIT: This same problem may occur with other MUSB dma as well.
205 * Easy to test with g_ether by pinging the MUSB board with ping -s54.
206 */
207 if ((chdat->transfer_len < chdat->packet_sz)
208 || (chdat->transfer_len % chdat->packet_sz != 0)) {
209 u16 csr;
210
211 if (chdat->tx) {
212 DBG(3, "terminating short tx packet\n");
213 musb_ep_select(mbase, chdat->epnum);
214 csr = musb_readw(hw_ep->regs, MUSB_TXCSR);
215 csr |= MUSB_TXCSR_MODE | MUSB_TXCSR_TXPKTRDY
216 | MUSB_TXCSR_P_WZC_BITS;
217 musb_writew(hw_ep->regs, MUSB_TXCSR, csr);
218 }
219 }
220
221 spin_unlock_irqrestore(&musb->lock, flags);
222 }
223
224 static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
225 u8 rndis_mode, dma_addr_t dma_addr, u32 len)
226 {
227 struct tusb_omap_dma_ch *chdat = to_chdat(channel);
228 struct tusb_omap_dma *tusb_dma = chdat->tusb_dma;
229 struct musb *musb = chdat->musb;
230 struct device *dev = musb->controller;
231 struct musb_hw_ep *hw_ep = chdat->hw_ep;
232 void __iomem *mbase = musb->mregs;
233 void __iomem *ep_conf = hw_ep->conf;
234 dma_addr_t fifo = hw_ep->fifo_sync;
235 struct omap_dma_channel_params dma_params;
236 u32 dma_remaining;
237 int src_burst, dst_burst;
238 u16 csr;
239 int ch;
240 s8 dmareq;
241 s8 sync_dev;
242
243 if (unlikely(dma_addr & 0x1) || (len < 32) || (len > packet_sz))
244 return false;
245
246 /*
247 * HW issue #10: Async dma will eventually corrupt the XFR_SIZE
248 * register which will cause missed DMA interrupt. We could try to
249 * use a timer for the callback, but it is unsafe as the XFR_SIZE
250 * register is corrupt, and we won't know if the DMA worked.
251 */
252 if (dma_addr & 0x2)
253 return false;
254
255 /*
256 * Because of HW issue #10, it seems like mixing sync DMA and async
257 * PIO access can confuse the DMA. Make sure XFR_SIZE is reset before
258 * using the channel for DMA.
259 */
260 if (chdat->tx)
261 dma_remaining = musb_readl(ep_conf, TUSB_EP_TX_OFFSET);
262 else
263 dma_remaining = musb_readl(ep_conf, TUSB_EP_RX_OFFSET);
264
265 dma_remaining = TUSB_EP_CONFIG_XFR_SIZE(dma_remaining);
266 if (dma_remaining) {
267 DBG(2, "Busy %s dma ch%i, not using: %08x\n",
268 chdat->tx ? "tx" : "rx", chdat->ch,
269 dma_remaining);
270 return false;
271 }
272
273 chdat->transfer_len = len & ~0x1f;
274
275 if (len < packet_sz)
276 chdat->transfer_packet_sz = chdat->transfer_len;
277 else
278 chdat->transfer_packet_sz = packet_sz;
279
280 if (tusb_dma->multichannel) {
281 ch = chdat->ch;
282 dmareq = chdat->dmareq;
283 sync_dev = chdat->sync_dev;
284 } else {
285 if (tusb_omap_use_shared_dmareq(chdat) != 0) {
286 DBG(3, "could not get dma for ep%i\n", chdat->epnum);
287 return false;
288 }
289 if (tusb_dma->ch < 0) {
290 /* REVISIT: This should get blocked earlier, happens
291 * with MSC ErrorRecoveryTest
292 */
293 WARN_ON(1);
294 return false;
295 }
296
297 ch = tusb_dma->ch;
298 dmareq = tusb_dma->dmareq;
299 sync_dev = tusb_dma->sync_dev;
300 omap_set_dma_callback(ch, tusb_omap_dma_cb, channel);
301 }
302
303 chdat->packet_sz = packet_sz;
304 chdat->len = len;
305 channel->actual_len = 0;
306 chdat->dma_addr = dma_addr;
307 channel->status = MUSB_DMA_STATUS_BUSY;
308
309 /* Since we're recycling dma areas, we need to clean or invalidate */
310 if (chdat->tx)
311 dma_map_single(dev, phys_to_virt(dma_addr), len,
312 DMA_TO_DEVICE);
313 else
314 dma_map_single(dev, phys_to_virt(dma_addr), len,
315 DMA_FROM_DEVICE);
316
317 /* Use 16-bit transfer if dma_addr is not 32-bit aligned */
318 if ((dma_addr & 0x3) == 0) {
319 dma_params.data_type = OMAP_DMA_DATA_TYPE_S32;
320 dma_params.elem_count = 8; /* Elements in frame */
321 } else {
322 dma_params.data_type = OMAP_DMA_DATA_TYPE_S16;
323 dma_params.elem_count = 16; /* Elements in frame */
324 fifo = hw_ep->fifo_async;
325 }
326
327 dma_params.frame_count = chdat->transfer_len / 32; /* Burst sz frame */
328
329 DBG(3, "ep%i %s dma ch%i dma: %08x len: %u(%u) packet_sz: %i(%i)\n",
330 chdat->epnum, chdat->tx ? "tx" : "rx",
331 ch, dma_addr, chdat->transfer_len, len,
332 chdat->transfer_packet_sz, packet_sz);
333
334 /*
335 * Prepare omap DMA for transfer
336 */
337 if (chdat->tx) {
338 dma_params.src_amode = OMAP_DMA_AMODE_POST_INC;
339 dma_params.src_start = (unsigned long)dma_addr;
340 dma_params.src_ei = 0;
341 dma_params.src_fi = 0;
342
343 dma_params.dst_amode = OMAP_DMA_AMODE_DOUBLE_IDX;
344 dma_params.dst_start = (unsigned long)fifo;
345 dma_params.dst_ei = 1;
346 dma_params.dst_fi = -31; /* Loop 32 byte window */
347
348 dma_params.trigger = sync_dev;
349 dma_params.sync_mode = OMAP_DMA_SYNC_FRAME;
350 dma_params.src_or_dst_synch = 0; /* Dest sync */
351
352 src_burst = OMAP_DMA_DATA_BURST_16; /* 16x32 read */
353 dst_burst = OMAP_DMA_DATA_BURST_8; /* 8x32 write */
354 } else {
355 dma_params.src_amode = OMAP_DMA_AMODE_DOUBLE_IDX;
356 dma_params.src_start = (unsigned long)fifo;
357 dma_params.src_ei = 1;
358 dma_params.src_fi = -31; /* Loop 32 byte window */
359
360 dma_params.dst_amode = OMAP_DMA_AMODE_POST_INC;
361 dma_params.dst_start = (unsigned long)dma_addr;
362 dma_params.dst_ei = 0;
363 dma_params.dst_fi = 0;
364
365 dma_params.trigger = sync_dev;
366 dma_params.sync_mode = OMAP_DMA_SYNC_FRAME;
367 dma_params.src_or_dst_synch = 1; /* Source sync */
368
369 src_burst = OMAP_DMA_DATA_BURST_8; /* 8x32 read */
370 dst_burst = OMAP_DMA_DATA_BURST_16; /* 16x32 write */
371 }
372
373 DBG(3, "ep%i %s using %i-bit %s dma from 0x%08lx to 0x%08lx\n",
374 chdat->epnum, chdat->tx ? "tx" : "rx",
375 (dma_params.data_type == OMAP_DMA_DATA_TYPE_S32) ? 32 : 16,
376 ((dma_addr & 0x3) == 0) ? "sync" : "async",
377 dma_params.src_start, dma_params.dst_start);
378
379 omap_set_dma_params(ch, &dma_params);
380 omap_set_dma_src_burst_mode(ch, src_burst);
381 omap_set_dma_dest_burst_mode(ch, dst_burst);
382 omap_set_dma_write_mode(ch, OMAP_DMA_WRITE_LAST_NON_POSTED);
383
384 /*
385 * Prepare MUSB for DMA transfer
386 */
387 if (chdat->tx) {
388 musb_ep_select(mbase, chdat->epnum);
389 csr = musb_readw(hw_ep->regs, MUSB_TXCSR);
390 csr |= (MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB
391 | MUSB_TXCSR_DMAMODE | MUSB_TXCSR_MODE);
392 csr &= ~MUSB_TXCSR_P_UNDERRUN;
393 musb_writew(hw_ep->regs, MUSB_TXCSR, csr);
394 } else {
395 musb_ep_select(mbase, chdat->epnum);
396 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
397 csr |= MUSB_RXCSR_DMAENAB;
398 csr &= ~(MUSB_RXCSR_AUTOCLEAR | MUSB_RXCSR_DMAMODE);
399 musb_writew(hw_ep->regs, MUSB_RXCSR,
400 csr | MUSB_RXCSR_P_WZC_BITS);
401 }
402
403 /*
404 * Start DMA transfer
405 */
406 omap_start_dma(ch);
407
408 if (chdat->tx) {
409 /* Send transfer_packet_sz packets at a time */
410 musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET,
411 chdat->transfer_packet_sz);
412
413 musb_writel(ep_conf, TUSB_EP_TX_OFFSET,
414 TUSB_EP_CONFIG_XFR_SIZE(chdat->transfer_len));
415 } else {
416 /* Receive transfer_packet_sz packets at a time */
417 musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET,
418 chdat->transfer_packet_sz << 16);
419
420 musb_writel(ep_conf, TUSB_EP_RX_OFFSET,
421 TUSB_EP_CONFIG_XFR_SIZE(chdat->transfer_len));
422 }
423
424 return true;
425 }
426
427 static int tusb_omap_dma_abort(struct dma_channel *channel)
428 {
429 struct tusb_omap_dma_ch *chdat = to_chdat(channel);
430 struct tusb_omap_dma *tusb_dma = chdat->tusb_dma;
431
432 if (!tusb_dma->multichannel) {
433 if (tusb_dma->ch >= 0) {
434 omap_stop_dma(tusb_dma->ch);
435 omap_free_dma(tusb_dma->ch);
436 tusb_dma->ch = -1;
437 }
438
439 tusb_dma->dmareq = -1;
440 tusb_dma->sync_dev = -1;
441 }
442
443 channel->status = MUSB_DMA_STATUS_FREE;
444
445 return 0;
446 }
447
448 static inline int tusb_omap_dma_allocate_dmareq(struct tusb_omap_dma_ch *chdat)
449 {
450 u32 reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
451 int i, dmareq_nr = -1;
452
453 const int sync_dev[6] = {
454 OMAP24XX_DMA_EXT_DMAREQ0,
455 OMAP24XX_DMA_EXT_DMAREQ1,
456 OMAP242X_DMA_EXT_DMAREQ2,
457 OMAP242X_DMA_EXT_DMAREQ3,
458 OMAP242X_DMA_EXT_DMAREQ4,
459 OMAP242X_DMA_EXT_DMAREQ5,
460 };
461
462 for (i = 0; i < MAX_DMAREQ; i++) {
463 int cur = (reg & (0xf << (i * 5))) >> (i * 5);
464 if (cur == 0) {
465 dmareq_nr = i;
466 break;
467 }
468 }
469
470 if (dmareq_nr == -1)
471 return -EAGAIN;
472
473 reg |= (chdat->epnum << (dmareq_nr * 5));
474 if (chdat->tx)
475 reg |= ((1 << 4) << (dmareq_nr * 5));
476 musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg);
477
478 chdat->dmareq = dmareq_nr;
479 chdat->sync_dev = sync_dev[chdat->dmareq];
480
481 return 0;
482 }
483
484 static inline void tusb_omap_dma_free_dmareq(struct tusb_omap_dma_ch *chdat)
485 {
486 u32 reg;
487
488 if (!chdat || chdat->dmareq < 0)
489 return;
490
491 reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
492 reg &= ~(0x1f << (chdat->dmareq * 5));
493 musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg);
494
495 chdat->dmareq = -1;
496 chdat->sync_dev = -1;
497 }
498
499 static struct dma_channel *dma_channel_pool[MAX_DMAREQ];
500
501 static struct dma_channel *
502 tusb_omap_dma_allocate(struct dma_controller *c,
503 struct musb_hw_ep *hw_ep,
504 u8 tx)
505 {
506 int ret, i;
507 const char *dev_name;
508 struct tusb_omap_dma *tusb_dma;
509 struct musb *musb;
510 void __iomem *tbase;
511 struct dma_channel *channel = NULL;
512 struct tusb_omap_dma_ch *chdat = NULL;
513 u32 reg;
514
515 tusb_dma = container_of(c, struct tusb_omap_dma, controller);
516 musb = tusb_dma->musb;
517 tbase = musb->ctrl_base;
518
519 reg = musb_readl(tbase, TUSB_DMA_INT_MASK);
520 if (tx)
521 reg &= ~(1 << hw_ep->epnum);
522 else
523 reg &= ~(1 << (hw_ep->epnum + 15));
524 musb_writel(tbase, TUSB_DMA_INT_MASK, reg);
525
526 /* REVISIT: Why does dmareq5 not work? */
527 if (hw_ep->epnum == 0) {
528 DBG(3, "Not allowing DMA for ep0 %s\n", tx ? "tx" : "rx");
529 return NULL;
530 }
531
532 for (i = 0; i < MAX_DMAREQ; i++) {
533 struct dma_channel *ch = dma_channel_pool[i];
534 if (ch->status == MUSB_DMA_STATUS_UNKNOWN) {
535 ch->status = MUSB_DMA_STATUS_FREE;
536 channel = ch;
537 chdat = ch->private_data;
538 break;
539 }
540 }
541
542 if (!channel)
543 return NULL;
544
545 if (tx) {
546 chdat->tx = 1;
547 dev_name = "TUSB transmit";
548 } else {
549 chdat->tx = 0;
550 dev_name = "TUSB receive";
551 }
552
553 chdat->musb = tusb_dma->musb;
554 chdat->tbase = tusb_dma->tbase;
555 chdat->hw_ep = hw_ep;
556 chdat->epnum = hw_ep->epnum;
557 chdat->dmareq = -1;
558 chdat->completed_len = 0;
559 chdat->tusb_dma = tusb_dma;
560
561 channel->max_len = 0x7fffffff;
562 channel->desired_mode = 0;
563 channel->actual_len = 0;
564
565 if (tusb_dma->multichannel) {
566 ret = tusb_omap_dma_allocate_dmareq(chdat);
567 if (ret != 0)
568 goto free_dmareq;
569
570 ret = omap_request_dma(chdat->sync_dev, dev_name,
571 tusb_omap_dma_cb, channel, &chdat->ch);
572 if (ret != 0)
573 goto free_dmareq;
574 } else if (tusb_dma->ch == -1) {
575 tusb_dma->dmareq = 0;
576 tusb_dma->sync_dev = OMAP24XX_DMA_EXT_DMAREQ0;
577
578 /* Callback data gets set later in the shared dmareq case */
579 ret = omap_request_dma(tusb_dma->sync_dev, "TUSB shared",
580 tusb_omap_dma_cb, NULL, &tusb_dma->ch);
581 if (ret != 0)
582 goto free_dmareq;
583
584 chdat->dmareq = -1;
585 chdat->ch = -1;
586 }
587
588 DBG(3, "ep%i %s dma: %s dma%i dmareq%i sync%i\n",
589 chdat->epnum,
590 chdat->tx ? "tx" : "rx",
591 chdat->ch >= 0 ? "dedicated" : "shared",
592 chdat->ch >= 0 ? chdat->ch : tusb_dma->ch,
593 chdat->dmareq >= 0 ? chdat->dmareq : tusb_dma->dmareq,
594 chdat->sync_dev >= 0 ? chdat->sync_dev : tusb_dma->sync_dev);
595
596 return channel;
597
598 free_dmareq:
599 tusb_omap_dma_free_dmareq(chdat);
600
601 DBG(3, "ep%i: Could not get a DMA channel\n", chdat->epnum);
602 channel->status = MUSB_DMA_STATUS_UNKNOWN;
603
604 return NULL;
605 }
606
607 static void tusb_omap_dma_release(struct dma_channel *channel)
608 {
609 struct tusb_omap_dma_ch *chdat = to_chdat(channel);
610 struct musb *musb = chdat->musb;
611 void __iomem *tbase = musb->ctrl_base;
612 u32 reg;
613
614 DBG(3, "ep%i ch%i\n", chdat->epnum, chdat->ch);
615
616 reg = musb_readl(tbase, TUSB_DMA_INT_MASK);
617 if (chdat->tx)
618 reg |= (1 << chdat->epnum);
619 else
620 reg |= (1 << (chdat->epnum + 15));
621 musb_writel(tbase, TUSB_DMA_INT_MASK, reg);
622
623 reg = musb_readl(tbase, TUSB_DMA_INT_CLEAR);
624 if (chdat->tx)
625 reg |= (1 << chdat->epnum);
626 else
627 reg |= (1 << (chdat->epnum + 15));
628 musb_writel(tbase, TUSB_DMA_INT_CLEAR, reg);
629
630 channel->status = MUSB_DMA_STATUS_UNKNOWN;
631
632 if (chdat->ch >= 0) {
633 omap_stop_dma(chdat->ch);
634 omap_free_dma(chdat->ch);
635 chdat->ch = -1;
636 }
637
638 if (chdat->dmareq >= 0)
639 tusb_omap_dma_free_dmareq(chdat);
640
641 channel = NULL;
642 }
643
644 void dma_controller_destroy(struct dma_controller *c)
645 {
646 struct tusb_omap_dma *tusb_dma;
647 int i;
648
649 tusb_dma = container_of(c, struct tusb_omap_dma, controller);
650 for (i = 0; i < MAX_DMAREQ; i++) {
651 struct dma_channel *ch = dma_channel_pool[i];
652 if (ch) {
653 kfree(ch->private_data);
654 kfree(ch);
655 }
656 }
657
658 if (tusb_dma && !tusb_dma->multichannel && tusb_dma->ch >= 0)
659 omap_free_dma(tusb_dma->ch);
660
661 kfree(tusb_dma);
662 }
663
664 struct dma_controller *__init
665 dma_controller_create(struct musb *musb, void __iomem *base)
666 {
667 void __iomem *tbase = musb->ctrl_base;
668 struct tusb_omap_dma *tusb_dma;
669 int i;
670
671 /* REVISIT: Get dmareq lines used from board-*.c */
672
673 musb_writel(musb->ctrl_base, TUSB_DMA_INT_MASK, 0x7fffffff);
674 musb_writel(musb->ctrl_base, TUSB_DMA_EP_MAP, 0);
675
676 musb_writel(tbase, TUSB_DMA_REQ_CONF,
677 TUSB_DMA_REQ_CONF_BURST_SIZE(2)
678 | TUSB_DMA_REQ_CONF_DMA_REQ_EN(0x3f)
679 | TUSB_DMA_REQ_CONF_DMA_REQ_ASSER(2));
680
681 tusb_dma = kzalloc(sizeof(struct tusb_omap_dma), GFP_KERNEL);
682 if (!tusb_dma)
683 goto cleanup;
684
685 tusb_dma->musb = musb;
686 tusb_dma->tbase = musb->ctrl_base;
687
688 tusb_dma->ch = -1;
689 tusb_dma->dmareq = -1;
690 tusb_dma->sync_dev = -1;
691
692 tusb_dma->controller.start = tusb_omap_dma_start;
693 tusb_dma->controller.stop = tusb_omap_dma_stop;
694 tusb_dma->controller.channel_alloc = tusb_omap_dma_allocate;
695 tusb_dma->controller.channel_release = tusb_omap_dma_release;
696 tusb_dma->controller.channel_program = tusb_omap_dma_program;
697 tusb_dma->controller.channel_abort = tusb_omap_dma_abort;
698
699 if (tusb_get_revision(musb) >= TUSB_REV_30)
700 tusb_dma->multichannel = 1;
701
702 for (i = 0; i < MAX_DMAREQ; i++) {
703 struct dma_channel *ch;
704 struct tusb_omap_dma_ch *chdat;
705
706 ch = kzalloc(sizeof(struct dma_channel), GFP_KERNEL);
707 if (!ch)
708 goto cleanup;
709
710 dma_channel_pool[i] = ch;
711
712 chdat = kzalloc(sizeof(struct tusb_omap_dma_ch), GFP_KERNEL);
713 if (!chdat)
714 goto cleanup;
715
716 ch->status = MUSB_DMA_STATUS_UNKNOWN;
717 ch->private_data = chdat;
718 }
719
720 return &tusb_dma->controller;
721
722 cleanup:
723 dma_controller_destroy(&tusb_dma->controller);
724
725 return NULL;
726 }
linux-next