]> Pileus Git - ~andy/linux/blob - drivers/usb/musb/tusb6010_omap.c
Merge branch 'acpi-bind'
[~andy/linux] / drivers / usb / musb / tusb6010_omap.c
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 <linux/omap-dma.h>
20
21 #include "musb_core.h"
22 #include "tusb6010.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 #define OMAP24XX_DMA_EXT_DMAREQ0        2
29 #define OMAP24XX_DMA_EXT_DMAREQ1        3
30 #define OMAP242X_DMA_EXT_DMAREQ2        14
31 #define OMAP242X_DMA_EXT_DMAREQ3        15
32 #define OMAP242X_DMA_EXT_DMAREQ4        16
33 #define OMAP242X_DMA_EXT_DMAREQ5        64
34
35 struct tusb_omap_dma_ch {
36         struct musb             *musb;
37         void __iomem            *tbase;
38         unsigned long           phys_offset;
39         int                     epnum;
40         u8                      tx;
41         struct musb_hw_ep       *hw_ep;
42
43         int                     ch;
44         s8                      dmareq;
45         s8                      sync_dev;
46
47         struct tusb_omap_dma    *tusb_dma;
48
49         dma_addr_t              dma_addr;
50
51         u32                     len;
52         u16                     packet_sz;
53         u16                     transfer_packet_sz;
54         u32                     transfer_len;
55         u32                     completed_len;
56 };
57
58 struct tusb_omap_dma {
59         struct dma_controller           controller;
60         struct musb                     *musb;
61         void __iomem                    *tbase;
62
63         int                             ch;
64         s8                              dmareq;
65         s8                              sync_dev;
66         unsigned                        multichannel:1;
67 };
68
69 /*
70  * Allocate dmareq0 to the current channel unless it's already taken
71  */
72 static inline int tusb_omap_use_shared_dmareq(struct tusb_omap_dma_ch *chdat)
73 {
74         u32             reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
75
76         if (reg != 0) {
77                 dev_dbg(chdat->musb->controller, "ep%i dmareq0 is busy for ep%i\n",
78                         chdat->epnum, reg & 0xf);
79                 return -EAGAIN;
80         }
81
82         if (chdat->tx)
83                 reg = (1 << 4) | chdat->epnum;
84         else
85                 reg = chdat->epnum;
86
87         musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg);
88
89         return 0;
90 }
91
92 static inline void tusb_omap_free_shared_dmareq(struct tusb_omap_dma_ch *chdat)
93 {
94         u32             reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
95
96         if ((reg & 0xf) != chdat->epnum) {
97                 printk(KERN_ERR "ep%i trying to release dmareq0 for ep%i\n",
98                         chdat->epnum, reg & 0xf);
99                 return;
100         }
101         musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, 0);
102 }
103
104 /*
105  * See also musb_dma_completion in plat_uds.c and musb_g_[tx|rx]() in
106  * musb_gadget.c.
107  */
108 static void tusb_omap_dma_cb(int lch, u16 ch_status, void *data)
109 {
110         struct dma_channel      *channel = (struct dma_channel *)data;
111         struct tusb_omap_dma_ch *chdat = to_chdat(channel);
112         struct tusb_omap_dma    *tusb_dma = chdat->tusb_dma;
113         struct musb             *musb = chdat->musb;
114         struct device           *dev = musb->controller;
115         struct musb_hw_ep       *hw_ep = chdat->hw_ep;
116         void __iomem            *ep_conf = hw_ep->conf;
117         void __iomem            *mbase = musb->mregs;
118         unsigned long           remaining, flags, pio;
119         int                     ch;
120
121         spin_lock_irqsave(&musb->lock, flags);
122
123         if (tusb_dma->multichannel)
124                 ch = chdat->ch;
125         else
126                 ch = tusb_dma->ch;
127
128         if (ch_status != OMAP_DMA_BLOCK_IRQ)
129                 printk(KERN_ERR "TUSB DMA error status: %i\n", ch_status);
130
131         dev_dbg(musb->controller, "ep%i %s dma callback ch: %i status: %x\n",
132                 chdat->epnum, chdat->tx ? "tx" : "rx",
133                 ch, ch_status);
134
135         if (chdat->tx)
136                 remaining = musb_readl(ep_conf, TUSB_EP_TX_OFFSET);
137         else
138                 remaining = musb_readl(ep_conf, TUSB_EP_RX_OFFSET);
139
140         remaining = TUSB_EP_CONFIG_XFR_SIZE(remaining);
141
142         /* HW issue #10: XFR_SIZE may get corrupt on DMA (both async & sync) */
143         if (unlikely(remaining > chdat->transfer_len)) {
144                 dev_dbg(musb->controller, "Corrupt %s dma ch%i XFR_SIZE: 0x%08lx\n",
145                         chdat->tx ? "tx" : "rx", chdat->ch,
146                         remaining);
147                 remaining = 0;
148         }
149
150         channel->actual_len = chdat->transfer_len - remaining;
151         pio = chdat->len - channel->actual_len;
152
153         dev_dbg(musb->controller, "DMA remaining %lu/%u\n", remaining, chdat->transfer_len);
154
155         /* Transfer remaining 1 - 31 bytes */
156         if (pio > 0 && pio < 32) {
157                 u8      *buf;
158
159                 dev_dbg(musb->controller, "Using PIO for remaining %lu bytes\n", pio);
160                 buf = phys_to_virt((u32)chdat->dma_addr) + chdat->transfer_len;
161                 if (chdat->tx) {
162                         dma_unmap_single(dev, chdat->dma_addr,
163                                                 chdat->transfer_len,
164                                                 DMA_TO_DEVICE);
165                         musb_write_fifo(hw_ep, pio, buf);
166                 } else {
167                         dma_unmap_single(dev, chdat->dma_addr,
168                                                 chdat->transfer_len,
169                                                 DMA_FROM_DEVICE);
170                         musb_read_fifo(hw_ep, pio, buf);
171                 }
172                 channel->actual_len += pio;
173         }
174
175         if (!tusb_dma->multichannel)
176                 tusb_omap_free_shared_dmareq(chdat);
177
178         channel->status = MUSB_DMA_STATUS_FREE;
179
180         /* Handle only RX callbacks here. TX callbacks must be handled based
181          * on the TUSB DMA status interrupt.
182          * REVISIT: Use both TUSB DMA status interrupt and OMAP DMA callback
183          * interrupt for RX and TX.
184          */
185         if (!chdat->tx)
186                 musb_dma_completion(musb, chdat->epnum, chdat->tx);
187
188         /* We must terminate short tx transfers manually by setting TXPKTRDY.
189          * REVISIT: This same problem may occur with other MUSB dma as well.
190          * Easy to test with g_ether by pinging the MUSB board with ping -s54.
191          */
192         if ((chdat->transfer_len < chdat->packet_sz)
193                         || (chdat->transfer_len % chdat->packet_sz != 0)) {
194                 u16     csr;
195
196                 if (chdat->tx) {
197                         dev_dbg(musb->controller, "terminating short tx packet\n");
198                         musb_ep_select(mbase, chdat->epnum);
199                         csr = musb_readw(hw_ep->regs, MUSB_TXCSR);
200                         csr |= MUSB_TXCSR_MODE | MUSB_TXCSR_TXPKTRDY
201                                 | MUSB_TXCSR_P_WZC_BITS;
202                         musb_writew(hw_ep->regs, MUSB_TXCSR, csr);
203                 }
204         }
205
206         spin_unlock_irqrestore(&musb->lock, flags);
207 }
208
209 static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
210                                 u8 rndis_mode, dma_addr_t dma_addr, u32 len)
211 {
212         struct tusb_omap_dma_ch         *chdat = to_chdat(channel);
213         struct tusb_omap_dma            *tusb_dma = chdat->tusb_dma;
214         struct musb                     *musb = chdat->musb;
215         struct device                   *dev = musb->controller;
216         struct musb_hw_ep               *hw_ep = chdat->hw_ep;
217         void __iomem                    *mbase = musb->mregs;
218         void __iomem                    *ep_conf = hw_ep->conf;
219         dma_addr_t                      fifo = hw_ep->fifo_sync;
220         struct omap_dma_channel_params  dma_params;
221         u32                             dma_remaining;
222         int                             src_burst, dst_burst;
223         u16                             csr;
224         int                             ch;
225         s8                              dmareq;
226         s8                              sync_dev;
227
228         if (unlikely(dma_addr & 0x1) || (len < 32) || (len > packet_sz))
229                 return false;
230
231         /*
232          * HW issue #10: Async dma will eventually corrupt the XFR_SIZE
233          * register which will cause missed DMA interrupt. We could try to
234          * use a timer for the callback, but it is unsafe as the XFR_SIZE
235          * register is corrupt, and we won't know if the DMA worked.
236          */
237         if (dma_addr & 0x2)
238                 return false;
239
240         /*
241          * Because of HW issue #10, it seems like mixing sync DMA and async
242          * PIO access can confuse the DMA. Make sure XFR_SIZE is reset before
243          * using the channel for DMA.
244          */
245         if (chdat->tx)
246                 dma_remaining = musb_readl(ep_conf, TUSB_EP_TX_OFFSET);
247         else
248                 dma_remaining = musb_readl(ep_conf, TUSB_EP_RX_OFFSET);
249
250         dma_remaining = TUSB_EP_CONFIG_XFR_SIZE(dma_remaining);
251         if (dma_remaining) {
252                 dev_dbg(musb->controller, "Busy %s dma ch%i, not using: %08x\n",
253                         chdat->tx ? "tx" : "rx", chdat->ch,
254                         dma_remaining);
255                 return false;
256         }
257
258         chdat->transfer_len = len & ~0x1f;
259
260         if (len < packet_sz)
261                 chdat->transfer_packet_sz = chdat->transfer_len;
262         else
263                 chdat->transfer_packet_sz = packet_sz;
264
265         if (tusb_dma->multichannel) {
266                 ch = chdat->ch;
267                 dmareq = chdat->dmareq;
268                 sync_dev = chdat->sync_dev;
269         } else {
270                 if (tusb_omap_use_shared_dmareq(chdat) != 0) {
271                         dev_dbg(musb->controller, "could not get dma for ep%i\n", chdat->epnum);
272                         return false;
273                 }
274                 if (tusb_dma->ch < 0) {
275                         /* REVISIT: This should get blocked earlier, happens
276                          * with MSC ErrorRecoveryTest
277                          */
278                         WARN_ON(1);
279                         return false;
280                 }
281
282                 ch = tusb_dma->ch;
283                 dmareq = tusb_dma->dmareq;
284                 sync_dev = tusb_dma->sync_dev;
285                 omap_set_dma_callback(ch, tusb_omap_dma_cb, channel);
286         }
287
288         chdat->packet_sz = packet_sz;
289         chdat->len = len;
290         channel->actual_len = 0;
291         chdat->dma_addr = dma_addr;
292         channel->status = MUSB_DMA_STATUS_BUSY;
293
294         /* Since we're recycling dma areas, we need to clean or invalidate */
295         if (chdat->tx)
296                 dma_map_single(dev, phys_to_virt(dma_addr), len,
297                                 DMA_TO_DEVICE);
298         else
299                 dma_map_single(dev, phys_to_virt(dma_addr), len,
300                                 DMA_FROM_DEVICE);
301
302         /* Use 16-bit transfer if dma_addr is not 32-bit aligned */
303         if ((dma_addr & 0x3) == 0) {
304                 dma_params.data_type = OMAP_DMA_DATA_TYPE_S32;
305                 dma_params.elem_count = 8;              /* Elements in frame */
306         } else {
307                 dma_params.data_type = OMAP_DMA_DATA_TYPE_S16;
308                 dma_params.elem_count = 16;             /* Elements in frame */
309                 fifo = hw_ep->fifo_async;
310         }
311
312         dma_params.frame_count  = chdat->transfer_len / 32; /* Burst sz frame */
313
314         dev_dbg(musb->controller, "ep%i %s dma ch%i dma: %08x len: %u(%u) packet_sz: %i(%i)\n",
315                 chdat->epnum, chdat->tx ? "tx" : "rx",
316                 ch, dma_addr, chdat->transfer_len, len,
317                 chdat->transfer_packet_sz, packet_sz);
318
319         /*
320          * Prepare omap DMA for transfer
321          */
322         if (chdat->tx) {
323                 dma_params.src_amode    = OMAP_DMA_AMODE_POST_INC;
324                 dma_params.src_start    = (unsigned long)dma_addr;
325                 dma_params.src_ei       = 0;
326                 dma_params.src_fi       = 0;
327
328                 dma_params.dst_amode    = OMAP_DMA_AMODE_DOUBLE_IDX;
329                 dma_params.dst_start    = (unsigned long)fifo;
330                 dma_params.dst_ei       = 1;
331                 dma_params.dst_fi       = -31;  /* Loop 32 byte window */
332
333                 dma_params.trigger      = sync_dev;
334                 dma_params.sync_mode    = OMAP_DMA_SYNC_FRAME;
335                 dma_params.src_or_dst_synch     = 0;    /* Dest sync */
336
337                 src_burst = OMAP_DMA_DATA_BURST_16;     /* 16x32 read */
338                 dst_burst = OMAP_DMA_DATA_BURST_8;      /* 8x32 write */
339         } else {
340                 dma_params.src_amode    = OMAP_DMA_AMODE_DOUBLE_IDX;
341                 dma_params.src_start    = (unsigned long)fifo;
342                 dma_params.src_ei       = 1;
343                 dma_params.src_fi       = -31;  /* Loop 32 byte window */
344
345                 dma_params.dst_amode    = OMAP_DMA_AMODE_POST_INC;
346                 dma_params.dst_start    = (unsigned long)dma_addr;
347                 dma_params.dst_ei       = 0;
348                 dma_params.dst_fi       = 0;
349
350                 dma_params.trigger      = sync_dev;
351                 dma_params.sync_mode    = OMAP_DMA_SYNC_FRAME;
352                 dma_params.src_or_dst_synch     = 1;    /* Source sync */
353
354                 src_burst = OMAP_DMA_DATA_BURST_8;      /* 8x32 read */
355                 dst_burst = OMAP_DMA_DATA_BURST_16;     /* 16x32 write */
356         }
357
358         dev_dbg(musb->controller, "ep%i %s using %i-bit %s dma from 0x%08lx to 0x%08lx\n",
359                 chdat->epnum, chdat->tx ? "tx" : "rx",
360                 (dma_params.data_type == OMAP_DMA_DATA_TYPE_S32) ? 32 : 16,
361                 ((dma_addr & 0x3) == 0) ? "sync" : "async",
362                 dma_params.src_start, dma_params.dst_start);
363
364         omap_set_dma_params(ch, &dma_params);
365         omap_set_dma_src_burst_mode(ch, src_burst);
366         omap_set_dma_dest_burst_mode(ch, dst_burst);
367         omap_set_dma_write_mode(ch, OMAP_DMA_WRITE_LAST_NON_POSTED);
368
369         /*
370          * Prepare MUSB for DMA transfer
371          */
372         if (chdat->tx) {
373                 musb_ep_select(mbase, chdat->epnum);
374                 csr = musb_readw(hw_ep->regs, MUSB_TXCSR);
375                 csr |= (MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB
376                         | MUSB_TXCSR_DMAMODE | MUSB_TXCSR_MODE);
377                 csr &= ~MUSB_TXCSR_P_UNDERRUN;
378                 musb_writew(hw_ep->regs, MUSB_TXCSR, csr);
379         } else {
380                 musb_ep_select(mbase, chdat->epnum);
381                 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
382                 csr |= MUSB_RXCSR_DMAENAB;
383                 csr &= ~(MUSB_RXCSR_AUTOCLEAR | MUSB_RXCSR_DMAMODE);
384                 musb_writew(hw_ep->regs, MUSB_RXCSR,
385                         csr | MUSB_RXCSR_P_WZC_BITS);
386         }
387
388         /*
389          * Start DMA transfer
390          */
391         omap_start_dma(ch);
392
393         if (chdat->tx) {
394                 /* Send transfer_packet_sz packets at a time */
395                 musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET,
396                         chdat->transfer_packet_sz);
397
398                 musb_writel(ep_conf, TUSB_EP_TX_OFFSET,
399                         TUSB_EP_CONFIG_XFR_SIZE(chdat->transfer_len));
400         } else {
401                 /* Receive transfer_packet_sz packets at a time */
402                 musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET,
403                         chdat->transfer_packet_sz << 16);
404
405                 musb_writel(ep_conf, TUSB_EP_RX_OFFSET,
406                         TUSB_EP_CONFIG_XFR_SIZE(chdat->transfer_len));
407         }
408
409         return true;
410 }
411
412 static int tusb_omap_dma_abort(struct dma_channel *channel)
413 {
414         struct tusb_omap_dma_ch *chdat = to_chdat(channel);
415         struct tusb_omap_dma    *tusb_dma = chdat->tusb_dma;
416
417         if (!tusb_dma->multichannel) {
418                 if (tusb_dma->ch >= 0) {
419                         omap_stop_dma(tusb_dma->ch);
420                         omap_free_dma(tusb_dma->ch);
421                         tusb_dma->ch = -1;
422                 }
423
424                 tusb_dma->dmareq = -1;
425                 tusb_dma->sync_dev = -1;
426         }
427
428         channel->status = MUSB_DMA_STATUS_FREE;
429
430         return 0;
431 }
432
433 static inline int tusb_omap_dma_allocate_dmareq(struct tusb_omap_dma_ch *chdat)
434 {
435         u32             reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
436         int             i, dmareq_nr = -1;
437
438         const int sync_dev[6] = {
439                 OMAP24XX_DMA_EXT_DMAREQ0,
440                 OMAP24XX_DMA_EXT_DMAREQ1,
441                 OMAP242X_DMA_EXT_DMAREQ2,
442                 OMAP242X_DMA_EXT_DMAREQ3,
443                 OMAP242X_DMA_EXT_DMAREQ4,
444                 OMAP242X_DMA_EXT_DMAREQ5,
445         };
446
447         for (i = 0; i < MAX_DMAREQ; i++) {
448                 int cur = (reg & (0xf << (i * 5))) >> (i * 5);
449                 if (cur == 0) {
450                         dmareq_nr = i;
451                         break;
452                 }
453         }
454
455         if (dmareq_nr == -1)
456                 return -EAGAIN;
457
458         reg |= (chdat->epnum << (dmareq_nr * 5));
459         if (chdat->tx)
460                 reg |= ((1 << 4) << (dmareq_nr * 5));
461         musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg);
462
463         chdat->dmareq = dmareq_nr;
464         chdat->sync_dev = sync_dev[chdat->dmareq];
465
466         return 0;
467 }
468
469 static inline void tusb_omap_dma_free_dmareq(struct tusb_omap_dma_ch *chdat)
470 {
471         u32 reg;
472
473         if (!chdat || chdat->dmareq < 0)
474                 return;
475
476         reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
477         reg &= ~(0x1f << (chdat->dmareq * 5));
478         musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg);
479
480         chdat->dmareq = -1;
481         chdat->sync_dev = -1;
482 }
483
484 static struct dma_channel *dma_channel_pool[MAX_DMAREQ];
485
486 static struct dma_channel *
487 tusb_omap_dma_allocate(struct dma_controller *c,
488                 struct musb_hw_ep *hw_ep,
489                 u8 tx)
490 {
491         int ret, i;
492         const char              *dev_name;
493         struct tusb_omap_dma    *tusb_dma;
494         struct musb             *musb;
495         void __iomem            *tbase;
496         struct dma_channel      *channel = NULL;
497         struct tusb_omap_dma_ch *chdat = NULL;
498         u32                     reg;
499
500         tusb_dma = container_of(c, struct tusb_omap_dma, controller);
501         musb = tusb_dma->musb;
502         tbase = musb->ctrl_base;
503
504         reg = musb_readl(tbase, TUSB_DMA_INT_MASK);
505         if (tx)
506                 reg &= ~(1 << hw_ep->epnum);
507         else
508                 reg &= ~(1 << (hw_ep->epnum + 15));
509         musb_writel(tbase, TUSB_DMA_INT_MASK, reg);
510
511         /* REVISIT: Why does dmareq5 not work? */
512         if (hw_ep->epnum == 0) {
513                 dev_dbg(musb->controller, "Not allowing DMA for ep0 %s\n", tx ? "tx" : "rx");
514                 return NULL;
515         }
516
517         for (i = 0; i < MAX_DMAREQ; i++) {
518                 struct dma_channel *ch = dma_channel_pool[i];
519                 if (ch->status == MUSB_DMA_STATUS_UNKNOWN) {
520                         ch->status = MUSB_DMA_STATUS_FREE;
521                         channel = ch;
522                         chdat = ch->private_data;
523                         break;
524                 }
525         }
526
527         if (!channel)
528                 return NULL;
529
530         if (tx) {
531                 chdat->tx = 1;
532                 dev_name = "TUSB transmit";
533         } else {
534                 chdat->tx = 0;
535                 dev_name = "TUSB receive";
536         }
537
538         chdat->musb = tusb_dma->musb;
539         chdat->tbase = tusb_dma->tbase;
540         chdat->hw_ep = hw_ep;
541         chdat->epnum = hw_ep->epnum;
542         chdat->dmareq = -1;
543         chdat->completed_len = 0;
544         chdat->tusb_dma = tusb_dma;
545
546         channel->max_len = 0x7fffffff;
547         channel->desired_mode = 0;
548         channel->actual_len = 0;
549
550         if (tusb_dma->multichannel) {
551                 ret = tusb_omap_dma_allocate_dmareq(chdat);
552                 if (ret != 0)
553                         goto free_dmareq;
554
555                 ret = omap_request_dma(chdat->sync_dev, dev_name,
556                                 tusb_omap_dma_cb, channel, &chdat->ch);
557                 if (ret != 0)
558                         goto free_dmareq;
559         } else if (tusb_dma->ch == -1) {
560                 tusb_dma->dmareq = 0;
561                 tusb_dma->sync_dev = OMAP24XX_DMA_EXT_DMAREQ0;
562
563                 /* Callback data gets set later in the shared dmareq case */
564                 ret = omap_request_dma(tusb_dma->sync_dev, "TUSB shared",
565                                 tusb_omap_dma_cb, NULL, &tusb_dma->ch);
566                 if (ret != 0)
567                         goto free_dmareq;
568
569                 chdat->dmareq = -1;
570                 chdat->ch = -1;
571         }
572
573         dev_dbg(musb->controller, "ep%i %s dma: %s dma%i dmareq%i sync%i\n",
574                 chdat->epnum,
575                 chdat->tx ? "tx" : "rx",
576                 chdat->ch >= 0 ? "dedicated" : "shared",
577                 chdat->ch >= 0 ? chdat->ch : tusb_dma->ch,
578                 chdat->dmareq >= 0 ? chdat->dmareq : tusb_dma->dmareq,
579                 chdat->sync_dev >= 0 ? chdat->sync_dev : tusb_dma->sync_dev);
580
581         return channel;
582
583 free_dmareq:
584         tusb_omap_dma_free_dmareq(chdat);
585
586         dev_dbg(musb->controller, "ep%i: Could not get a DMA channel\n", chdat->epnum);
587         channel->status = MUSB_DMA_STATUS_UNKNOWN;
588
589         return NULL;
590 }
591
592 static void tusb_omap_dma_release(struct dma_channel *channel)
593 {
594         struct tusb_omap_dma_ch *chdat = to_chdat(channel);
595         struct musb             *musb = chdat->musb;
596         void __iomem            *tbase = musb->ctrl_base;
597         u32                     reg;
598
599         dev_dbg(musb->controller, "ep%i ch%i\n", chdat->epnum, chdat->ch);
600
601         reg = musb_readl(tbase, TUSB_DMA_INT_MASK);
602         if (chdat->tx)
603                 reg |= (1 << chdat->epnum);
604         else
605                 reg |= (1 << (chdat->epnum + 15));
606         musb_writel(tbase, TUSB_DMA_INT_MASK, reg);
607
608         reg = musb_readl(tbase, TUSB_DMA_INT_CLEAR);
609         if (chdat->tx)
610                 reg |= (1 << chdat->epnum);
611         else
612                 reg |= (1 << (chdat->epnum + 15));
613         musb_writel(tbase, TUSB_DMA_INT_CLEAR, reg);
614
615         channel->status = MUSB_DMA_STATUS_UNKNOWN;
616
617         if (chdat->ch >= 0) {
618                 omap_stop_dma(chdat->ch);
619                 omap_free_dma(chdat->ch);
620                 chdat->ch = -1;
621         }
622
623         if (chdat->dmareq >= 0)
624                 tusb_omap_dma_free_dmareq(chdat);
625
626         channel = NULL;
627 }
628
629 void dma_controller_destroy(struct dma_controller *c)
630 {
631         struct tusb_omap_dma    *tusb_dma;
632         int                     i;
633
634         tusb_dma = container_of(c, struct tusb_omap_dma, controller);
635         for (i = 0; i < MAX_DMAREQ; i++) {
636                 struct dma_channel *ch = dma_channel_pool[i];
637                 if (ch) {
638                         kfree(ch->private_data);
639                         kfree(ch);
640                 }
641         }
642
643         if (tusb_dma && !tusb_dma->multichannel && tusb_dma->ch >= 0)
644                 omap_free_dma(tusb_dma->ch);
645
646         kfree(tusb_dma);
647 }
648
649 struct dma_controller *dma_controller_create(struct musb *musb, void __iomem *base)
650 {
651         void __iomem            *tbase = musb->ctrl_base;
652         struct tusb_omap_dma    *tusb_dma;
653         int                     i;
654
655         /* REVISIT: Get dmareq lines used from board-*.c */
656
657         musb_writel(musb->ctrl_base, TUSB_DMA_INT_MASK, 0x7fffffff);
658         musb_writel(musb->ctrl_base, TUSB_DMA_EP_MAP, 0);
659
660         musb_writel(tbase, TUSB_DMA_REQ_CONF,
661                 TUSB_DMA_REQ_CONF_BURST_SIZE(2)
662                 | TUSB_DMA_REQ_CONF_DMA_REQ_EN(0x3f)
663                 | TUSB_DMA_REQ_CONF_DMA_REQ_ASSER(2));
664
665         tusb_dma = kzalloc(sizeof(struct tusb_omap_dma), GFP_KERNEL);
666         if (!tusb_dma)
667                 goto out;
668
669         tusb_dma->musb = musb;
670         tusb_dma->tbase = musb->ctrl_base;
671
672         tusb_dma->ch = -1;
673         tusb_dma->dmareq = -1;
674         tusb_dma->sync_dev = -1;
675
676         tusb_dma->controller.channel_alloc = tusb_omap_dma_allocate;
677         tusb_dma->controller.channel_release = tusb_omap_dma_release;
678         tusb_dma->controller.channel_program = tusb_omap_dma_program;
679         tusb_dma->controller.channel_abort = tusb_omap_dma_abort;
680
681         if (tusb_get_revision(musb) >= TUSB_REV_30)
682                 tusb_dma->multichannel = 1;
683
684         for (i = 0; i < MAX_DMAREQ; i++) {
685                 struct dma_channel      *ch;
686                 struct tusb_omap_dma_ch *chdat;
687
688                 ch = kzalloc(sizeof(struct dma_channel), GFP_KERNEL);
689                 if (!ch)
690                         goto cleanup;
691
692                 dma_channel_pool[i] = ch;
693
694                 chdat = kzalloc(sizeof(struct tusb_omap_dma_ch), GFP_KERNEL);
695                 if (!chdat)
696                         goto cleanup;
697
698                 ch->status = MUSB_DMA_STATUS_UNKNOWN;
699                 ch->private_data = chdat;
700         }
701
702         return &tusb_dma->controller;
703
704 cleanup:
705         dma_controller_destroy(&tusb_dma->controller);
706 out:
707         return NULL;
708 }