Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / 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/usb.h>
15 #include <linux/platform_device.h>
16 #include <linux/dma-mapping.h>
17 #include <linux/slab.h>
18 #include <linux/omap-dma.h>
19
20 #include "musb_core.h"
21 #include "tusb6010.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 #define OMAP24XX_DMA_EXT_DMAREQ0        2
28 #define OMAP24XX_DMA_EXT_DMAREQ1        3
29 #define OMAP242X_DMA_EXT_DMAREQ2        14
30 #define OMAP242X_DMA_EXT_DMAREQ3        15
31 #define OMAP242X_DMA_EXT_DMAREQ4        16
32 #define OMAP242X_DMA_EXT_DMAREQ5        64
33
34 struct tusb_omap_dma_ch {
35         struct musb             *musb;
36         void __iomem            *tbase;
37         unsigned long           phys_offset;
38         int                     epnum;
39         u8                      tx;
40         struct musb_hw_ep       *hw_ep;
41
42         int                     ch;
43         s8                      dmareq;
44         s8                      sync_dev;
45
46         struct tusb_omap_dma    *tusb_dma;
47
48         dma_addr_t              dma_addr;
49
50         u32                     len;
51         u16                     packet_sz;
52         u16                     transfer_packet_sz;
53         u32                     transfer_len;
54         u32                     completed_len;
55 };
56
57 struct tusb_omap_dma {
58         struct dma_controller           controller;
59         struct musb                     *musb;
60         void __iomem                    *tbase;
61
62         int                             ch;
63         s8                              dmareq;
64         s8                              sync_dev;
65         unsigned                        multichannel:1;
66 };
67
68 /*
69  * Allocate dmareq0 to the current channel unless it's already taken
70  */
71 static inline int tusb_omap_use_shared_dmareq(struct tusb_omap_dma_ch *chdat)
72 {
73         u32             reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
74
75         if (reg != 0) {
76                 dev_dbg(chdat->musb->controller, "ep%i dmareq0 is busy for ep%i\n",
77                         chdat->epnum, reg & 0xf);
78                 return -EAGAIN;
79         }
80
81         if (chdat->tx)
82                 reg = (1 << 4) | chdat->epnum;
83         else
84                 reg = chdat->epnum;
85
86         musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg);
87
88         return 0;
89 }
90
91 static inline void tusb_omap_free_shared_dmareq(struct tusb_omap_dma_ch *chdat)
92 {
93         u32             reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
94
95         if ((reg & 0xf) != chdat->epnum) {
96                 printk(KERN_ERR "ep%i trying to release dmareq0 for ep%i\n",
97                         chdat->epnum, reg & 0xf);
98                 return;
99         }
100         musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, 0);
101 }
102
103 /*
104  * See also musb_dma_completion in plat_uds.c and musb_g_[tx|rx]() in
105  * musb_gadget.c.
106  */
107 static void tusb_omap_dma_cb(int lch, u16 ch_status, void *data)
108 {
109         struct dma_channel      *channel = (struct dma_channel *)data;
110         struct tusb_omap_dma_ch *chdat = to_chdat(channel);
111         struct tusb_omap_dma    *tusb_dma = chdat->tusb_dma;
112         struct musb             *musb = chdat->musb;
113         struct device           *dev = musb->controller;
114         struct musb_hw_ep       *hw_ep = chdat->hw_ep;
115         void __iomem            *ep_conf = hw_ep->conf;
116         void __iomem            *mbase = musb->mregs;
117         unsigned long           remaining, flags, pio;
118         int                     ch;
119
120         spin_lock_irqsave(&musb->lock, flags);
121
122         if (tusb_dma->multichannel)
123                 ch = chdat->ch;
124         else
125                 ch = tusb_dma->ch;
126
127         if (ch_status != OMAP_DMA_BLOCK_IRQ)
128                 printk(KERN_ERR "TUSB DMA error status: %i\n", ch_status);
129
130         dev_dbg(musb->controller, "ep%i %s dma callback ch: %i status: %x\n",
131                 chdat->epnum, chdat->tx ? "tx" : "rx",
132                 ch, ch_status);
133
134         if (chdat->tx)
135                 remaining = musb_readl(ep_conf, TUSB_EP_TX_OFFSET);
136         else
137                 remaining = musb_readl(ep_conf, TUSB_EP_RX_OFFSET);
138
139         remaining = TUSB_EP_CONFIG_XFR_SIZE(remaining);
140
141         /* HW issue #10: XFR_SIZE may get corrupt on DMA (both async & sync) */
142         if (unlikely(remaining > chdat->transfer_len)) {
143                 dev_dbg(musb->controller, "Corrupt %s dma ch%i XFR_SIZE: 0x%08lx\n",
144                         chdat->tx ? "tx" : "rx", chdat->ch,
145                         remaining);
146                 remaining = 0;
147         }
148
149         channel->actual_len = chdat->transfer_len - remaining;
150         pio = chdat->len - channel->actual_len;
151
152         dev_dbg(musb->controller, "DMA remaining %lu/%u\n", remaining, chdat->transfer_len);
153
154         /* Transfer remaining 1 - 31 bytes */
155         if (pio > 0 && pio < 32) {
156                 u8      *buf;
157
158                 dev_dbg(musb->controller, "Using PIO for remaining %lu bytes\n", pio);
159                 buf = phys_to_virt((u32)chdat->dma_addr) + chdat->transfer_len;
160                 if (chdat->tx) {
161                         dma_unmap_single(dev, chdat->dma_addr,
162                                                 chdat->transfer_len,
163                                                 DMA_TO_DEVICE);
164                         musb_write_fifo(hw_ep, pio, buf);
165                 } else {
166                         dma_unmap_single(dev, chdat->dma_addr,
167                                                 chdat->transfer_len,
168                                                 DMA_FROM_DEVICE);
169                         musb_read_fifo(hw_ep, pio, buf);
170                 }
171                 channel->actual_len += pio;
172         }
173
174         if (!tusb_dma->multichannel)
175                 tusb_omap_free_shared_dmareq(chdat);
176
177         channel->status = MUSB_DMA_STATUS_FREE;
178
179         /* Handle only RX callbacks here. TX callbacks must be handled based
180          * on the TUSB DMA status interrupt.
181          * REVISIT: Use both TUSB DMA status interrupt and OMAP DMA callback
182          * interrupt for RX and TX.
183          */
184         if (!chdat->tx)
185                 musb_dma_completion(musb, chdat->epnum, chdat->tx);
186
187         /* We must terminate short tx transfers manually by setting TXPKTRDY.
188          * REVISIT: This same problem may occur with other MUSB dma as well.
189          * Easy to test with g_ether by pinging the MUSB board with ping -s54.
190          */
191         if ((chdat->transfer_len < chdat->packet_sz)
192                         || (chdat->transfer_len % chdat->packet_sz != 0)) {
193                 u16     csr;
194
195                 if (chdat->tx) {
196                         dev_dbg(musb->controller, "terminating short tx packet\n");
197                         musb_ep_select(mbase, chdat->epnum);
198                         csr = musb_readw(hw_ep->regs, MUSB_TXCSR);
199                         csr |= MUSB_TXCSR_MODE | MUSB_TXCSR_TXPKTRDY
200                                 | MUSB_TXCSR_P_WZC_BITS;
201                         musb_writew(hw_ep->regs, MUSB_TXCSR, csr);
202                 }
203         }
204
205         spin_unlock_irqrestore(&musb->lock, flags);
206 }
207
208 static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
209                                 u8 rndis_mode, dma_addr_t dma_addr, u32 len)
210 {
211         struct tusb_omap_dma_ch         *chdat = to_chdat(channel);
212         struct tusb_omap_dma            *tusb_dma = chdat->tusb_dma;
213         struct musb                     *musb = chdat->musb;
214         struct device                   *dev = musb->controller;
215         struct musb_hw_ep               *hw_ep = chdat->hw_ep;
216         void __iomem                    *mbase = musb->mregs;
217         void __iomem                    *ep_conf = hw_ep->conf;
218         dma_addr_t                      fifo = hw_ep->fifo_sync;
219         struct omap_dma_channel_params  dma_params;
220         u32                             dma_remaining;
221         int                             src_burst, dst_burst;
222         u16                             csr;
223         int                             ch;
224         s8                              dmareq;
225         s8                              sync_dev;
226
227         if (unlikely(dma_addr & 0x1) || (len < 32) || (len > packet_sz))
228                 return false;
229
230         /*
231          * HW issue #10: Async dma will eventually corrupt the XFR_SIZE
232          * register which will cause missed DMA interrupt. We could try to
233          * use a timer for the callback, but it is unsafe as the XFR_SIZE
234          * register is corrupt, and we won't know if the DMA worked.
235          */
236         if (dma_addr & 0x2)
237                 return false;
238
239         /*
240          * Because of HW issue #10, it seems like mixing sync DMA and async
241          * PIO access can confuse the DMA. Make sure XFR_SIZE is reset before
242          * using the channel for DMA.
243          */
244         if (chdat->tx)
245                 dma_remaining = musb_readl(ep_conf, TUSB_EP_TX_OFFSET);
246         else
247                 dma_remaining = musb_readl(ep_conf, TUSB_EP_RX_OFFSET);
248
249         dma_remaining = TUSB_EP_CONFIG_XFR_SIZE(dma_remaining);
250         if (dma_remaining) {
251                 dev_dbg(musb->controller, "Busy %s dma ch%i, not using: %08x\n",
252                         chdat->tx ? "tx" : "rx", chdat->ch,
253                         dma_remaining);
254                 return false;
255         }
256
257         chdat->transfer_len = len & ~0x1f;
258
259         if (len < packet_sz)
260                 chdat->transfer_packet_sz = chdat->transfer_len;
261         else
262                 chdat->transfer_packet_sz = packet_sz;
263
264         if (tusb_dma->multichannel) {
265                 ch = chdat->ch;
266                 dmareq = chdat->dmareq;
267                 sync_dev = chdat->sync_dev;
268         } else {
269                 if (tusb_omap_use_shared_dmareq(chdat) != 0) {
270                         dev_dbg(musb->controller, "could not get dma for ep%i\n", chdat->epnum);
271                         return false;
272                 }
273                 if (tusb_dma->ch < 0) {
274                         /* REVISIT: This should get blocked earlier, happens
275                          * with MSC ErrorRecoveryTest
276                          */
277                         WARN_ON(1);
278                         return false;
279                 }
280
281                 ch = tusb_dma->ch;
282                 dmareq = tusb_dma->dmareq;
283                 sync_dev = tusb_dma->sync_dev;
284                 omap_set_dma_callback(ch, tusb_omap_dma_cb, channel);
285         }
286
287         chdat->packet_sz = packet_sz;
288         chdat->len = len;
289         channel->actual_len = 0;
290         chdat->dma_addr = dma_addr;
291         channel->status = MUSB_DMA_STATUS_BUSY;
292
293         /* Since we're recycling dma areas, we need to clean or invalidate */
294         if (chdat->tx)
295                 dma_map_single(dev, phys_to_virt(dma_addr), len,
296                                 DMA_TO_DEVICE);
297         else
298                 dma_map_single(dev, phys_to_virt(dma_addr), len,
299                                 DMA_FROM_DEVICE);
300
301         /* Use 16-bit transfer if dma_addr is not 32-bit aligned */
302         if ((dma_addr & 0x3) == 0) {
303                 dma_params.data_type = OMAP_DMA_DATA_TYPE_S32;
304                 dma_params.elem_count = 8;              /* Elements in frame */
305         } else {
306                 dma_params.data_type = OMAP_DMA_DATA_TYPE_S16;
307                 dma_params.elem_count = 16;             /* Elements in frame */
308                 fifo = hw_ep->fifo_async;
309         }
310
311         dma_params.frame_count  = chdat->transfer_len / 32; /* Burst sz frame */
312
313         dev_dbg(musb->controller, "ep%i %s dma ch%i dma: %08x len: %u(%u) packet_sz: %i(%i)\n",
314                 chdat->epnum, chdat->tx ? "tx" : "rx",
315                 ch, dma_addr, chdat->transfer_len, len,
316                 chdat->transfer_packet_sz, packet_sz);
317
318         /*
319          * Prepare omap DMA for transfer
320          */
321         if (chdat->tx) {
322                 dma_params.src_amode    = OMAP_DMA_AMODE_POST_INC;
323                 dma_params.src_start    = (unsigned long)dma_addr;
324                 dma_params.src_ei       = 0;
325                 dma_params.src_fi       = 0;
326
327                 dma_params.dst_amode    = OMAP_DMA_AMODE_DOUBLE_IDX;
328                 dma_params.dst_start    = (unsigned long)fifo;
329                 dma_params.dst_ei       = 1;
330                 dma_params.dst_fi       = -31;  /* Loop 32 byte window */
331
332                 dma_params.trigger      = sync_dev;
333                 dma_params.sync_mode    = OMAP_DMA_SYNC_FRAME;
334                 dma_params.src_or_dst_synch     = 0;    /* Dest sync */
335
336                 src_burst = OMAP_DMA_DATA_BURST_16;     /* 16x32 read */
337                 dst_burst = OMAP_DMA_DATA_BURST_8;      /* 8x32 write */
338         } else {
339                 dma_params.src_amode    = OMAP_DMA_AMODE_DOUBLE_IDX;
340                 dma_params.src_start    = (unsigned long)fifo;
341                 dma_params.src_ei       = 1;
342                 dma_params.src_fi       = -31;  /* Loop 32 byte window */
343
344                 dma_params.dst_amode    = OMAP_DMA_AMODE_POST_INC;
345                 dma_params.dst_start    = (unsigned long)dma_addr;
346                 dma_params.dst_ei       = 0;
347                 dma_params.dst_fi       = 0;
348
349                 dma_params.trigger      = sync_dev;
350                 dma_params.sync_mode    = OMAP_DMA_SYNC_FRAME;
351                 dma_params.src_or_dst_synch     = 1;    /* Source sync */
352
353                 src_burst = OMAP_DMA_DATA_BURST_8;      /* 8x32 read */
354                 dst_burst = OMAP_DMA_DATA_BURST_16;     /* 16x32 write */
355         }
356
357         dev_dbg(musb->controller, "ep%i %s using %i-bit %s dma from 0x%08lx to 0x%08lx\n",
358                 chdat->epnum, chdat->tx ? "tx" : "rx",
359                 (dma_params.data_type == OMAP_DMA_DATA_TYPE_S32) ? 32 : 16,
360                 ((dma_addr & 0x3) == 0) ? "sync" : "async",
361                 dma_params.src_start, dma_params.dst_start);
362
363         omap_set_dma_params(ch, &dma_params);
364         omap_set_dma_src_burst_mode(ch, src_burst);
365         omap_set_dma_dest_burst_mode(ch, dst_burst);
366         omap_set_dma_write_mode(ch, OMAP_DMA_WRITE_LAST_NON_POSTED);
367
368         /*
369          * Prepare MUSB for DMA transfer
370          */
371         if (chdat->tx) {
372                 musb_ep_select(mbase, chdat->epnum);
373                 csr = musb_readw(hw_ep->regs, MUSB_TXCSR);
374                 csr |= (MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB
375                         | MUSB_TXCSR_DMAMODE | MUSB_TXCSR_MODE);
376                 csr &= ~MUSB_TXCSR_P_UNDERRUN;
377                 musb_writew(hw_ep->regs, MUSB_TXCSR, csr);
378         } else {
379                 musb_ep_select(mbase, chdat->epnum);
380                 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
381                 csr |= MUSB_RXCSR_DMAENAB;
382                 csr &= ~(MUSB_RXCSR_AUTOCLEAR | MUSB_RXCSR_DMAMODE);
383                 musb_writew(hw_ep->regs, MUSB_RXCSR,
384                         csr | MUSB_RXCSR_P_WZC_BITS);
385         }
386
387         /*
388          * Start DMA transfer
389          */
390         omap_start_dma(ch);
391
392         if (chdat->tx) {
393                 /* Send transfer_packet_sz packets at a time */
394                 musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET,
395                         chdat->transfer_packet_sz);
396
397                 musb_writel(ep_conf, TUSB_EP_TX_OFFSET,
398                         TUSB_EP_CONFIG_XFR_SIZE(chdat->transfer_len));
399         } else {
400                 /* Receive transfer_packet_sz packets at a time */
401                 musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET,
402                         chdat->transfer_packet_sz << 16);
403
404                 musb_writel(ep_conf, TUSB_EP_RX_OFFSET,
405                         TUSB_EP_CONFIG_XFR_SIZE(chdat->transfer_len));
406         }
407
408         return true;
409 }
410
411 static int tusb_omap_dma_abort(struct dma_channel *channel)
412 {
413         struct tusb_omap_dma_ch *chdat = to_chdat(channel);
414         struct tusb_omap_dma    *tusb_dma = chdat->tusb_dma;
415
416         if (!tusb_dma->multichannel) {
417                 if (tusb_dma->ch >= 0) {
418                         omap_stop_dma(tusb_dma->ch);
419                         omap_free_dma(tusb_dma->ch);
420                         tusb_dma->ch = -1;
421                 }
422
423                 tusb_dma->dmareq = -1;
424                 tusb_dma->sync_dev = -1;
425         }
426
427         channel->status = MUSB_DMA_STATUS_FREE;
428
429         return 0;
430 }
431
432 static inline int tusb_omap_dma_allocate_dmareq(struct tusb_omap_dma_ch *chdat)
433 {
434         u32             reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
435         int             i, dmareq_nr = -1;
436
437         const int sync_dev[6] = {
438                 OMAP24XX_DMA_EXT_DMAREQ0,
439                 OMAP24XX_DMA_EXT_DMAREQ1,
440                 OMAP242X_DMA_EXT_DMAREQ2,
441                 OMAP242X_DMA_EXT_DMAREQ3,
442                 OMAP242X_DMA_EXT_DMAREQ4,
443                 OMAP242X_DMA_EXT_DMAREQ5,
444         };
445
446         for (i = 0; i < MAX_DMAREQ; i++) {
447                 int cur = (reg & (0xf << (i * 5))) >> (i * 5);
448                 if (cur == 0) {
449                         dmareq_nr = i;
450                         break;
451                 }
452         }
453
454         if (dmareq_nr == -1)
455                 return -EAGAIN;
456
457         reg |= (chdat->epnum << (dmareq_nr * 5));
458         if (chdat->tx)
459                 reg |= ((1 << 4) << (dmareq_nr * 5));
460         musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg);
461
462         chdat->dmareq = dmareq_nr;
463         chdat->sync_dev = sync_dev[chdat->dmareq];
464
465         return 0;
466 }
467
468 static inline void tusb_omap_dma_free_dmareq(struct tusb_omap_dma_ch *chdat)
469 {
470         u32 reg;
471
472         if (!chdat || chdat->dmareq < 0)
473                 return;
474
475         reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
476         reg &= ~(0x1f << (chdat->dmareq * 5));
477         musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg);
478
479         chdat->dmareq = -1;
480         chdat->sync_dev = -1;
481 }
482
483 static struct dma_channel *dma_channel_pool[MAX_DMAREQ];
484
485 static struct dma_channel *
486 tusb_omap_dma_allocate(struct dma_controller *c,
487                 struct musb_hw_ep *hw_ep,
488                 u8 tx)
489 {
490         int ret, i;
491         const char              *dev_name;
492         struct tusb_omap_dma    *tusb_dma;
493         struct musb             *musb;
494         void __iomem            *tbase;
495         struct dma_channel      *channel = NULL;
496         struct tusb_omap_dma_ch *chdat = NULL;
497         u32                     reg;
498
499         tusb_dma = container_of(c, struct tusb_omap_dma, controller);
500         musb = tusb_dma->musb;
501         tbase = musb->ctrl_base;
502
503         reg = musb_readl(tbase, TUSB_DMA_INT_MASK);
504         if (tx)
505                 reg &= ~(1 << hw_ep->epnum);
506         else
507                 reg &= ~(1 << (hw_ep->epnum + 15));
508         musb_writel(tbase, TUSB_DMA_INT_MASK, reg);
509
510         /* REVISIT: Why does dmareq5 not work? */
511         if (hw_ep->epnum == 0) {
512                 dev_dbg(musb->controller, "Not allowing DMA for ep0 %s\n", tx ? "tx" : "rx");
513                 return NULL;
514         }
515
516         for (i = 0; i < MAX_DMAREQ; i++) {
517                 struct dma_channel *ch = dma_channel_pool[i];
518                 if (ch->status == MUSB_DMA_STATUS_UNKNOWN) {
519                         ch->status = MUSB_DMA_STATUS_FREE;
520                         channel = ch;
521                         chdat = ch->private_data;
522                         break;
523                 }
524         }
525
526         if (!channel)
527                 return NULL;
528
529         if (tx) {
530                 chdat->tx = 1;
531                 dev_name = "TUSB transmit";
532         } else {
533                 chdat->tx = 0;
534                 dev_name = "TUSB receive";
535         }
536
537         chdat->musb = tusb_dma->musb;
538         chdat->tbase = tusb_dma->tbase;
539         chdat->hw_ep = hw_ep;
540         chdat->epnum = hw_ep->epnum;
541         chdat->dmareq = -1;
542         chdat->completed_len = 0;
543         chdat->tusb_dma = tusb_dma;
544
545         channel->max_len = 0x7fffffff;
546         channel->desired_mode = 0;
547         channel->actual_len = 0;
548
549         if (tusb_dma->multichannel) {
550                 ret = tusb_omap_dma_allocate_dmareq(chdat);
551                 if (ret != 0)
552                         goto free_dmareq;
553
554                 ret = omap_request_dma(chdat->sync_dev, dev_name,
555                                 tusb_omap_dma_cb, channel, &chdat->ch);
556                 if (ret != 0)
557                         goto free_dmareq;
558         } else if (tusb_dma->ch == -1) {
559                 tusb_dma->dmareq = 0;
560                 tusb_dma->sync_dev = OMAP24XX_DMA_EXT_DMAREQ0;
561
562                 /* Callback data gets set later in the shared dmareq case */
563                 ret = omap_request_dma(tusb_dma->sync_dev, "TUSB shared",
564                                 tusb_omap_dma_cb, NULL, &tusb_dma->ch);
565                 if (ret != 0)
566                         goto free_dmareq;
567
568                 chdat->dmareq = -1;
569                 chdat->ch = -1;
570         }
571
572         dev_dbg(musb->controller, "ep%i %s dma: %s dma%i dmareq%i sync%i\n",
573                 chdat->epnum,
574                 chdat->tx ? "tx" : "rx",
575                 chdat->ch >= 0 ? "dedicated" : "shared",
576                 chdat->ch >= 0 ? chdat->ch : tusb_dma->ch,
577                 chdat->dmareq >= 0 ? chdat->dmareq : tusb_dma->dmareq,
578                 chdat->sync_dev >= 0 ? chdat->sync_dev : tusb_dma->sync_dev);
579
580         return channel;
581
582 free_dmareq:
583         tusb_omap_dma_free_dmareq(chdat);
584
585         dev_dbg(musb->controller, "ep%i: Could not get a DMA channel\n", chdat->epnum);
586         channel->status = MUSB_DMA_STATUS_UNKNOWN;
587
588         return NULL;
589 }
590
591 static void tusb_omap_dma_release(struct dma_channel *channel)
592 {
593         struct tusb_omap_dma_ch *chdat = to_chdat(channel);
594         struct musb             *musb = chdat->musb;
595         void __iomem            *tbase = musb->ctrl_base;
596         u32                     reg;
597
598         dev_dbg(musb->controller, "ep%i ch%i\n", chdat->epnum, chdat->ch);
599
600         reg = musb_readl(tbase, TUSB_DMA_INT_MASK);
601         if (chdat->tx)
602                 reg |= (1 << chdat->epnum);
603         else
604                 reg |= (1 << (chdat->epnum + 15));
605         musb_writel(tbase, TUSB_DMA_INT_MASK, reg);
606
607         reg = musb_readl(tbase, TUSB_DMA_INT_CLEAR);
608         if (chdat->tx)
609                 reg |= (1 << chdat->epnum);
610         else
611                 reg |= (1 << (chdat->epnum + 15));
612         musb_writel(tbase, TUSB_DMA_INT_CLEAR, reg);
613
614         channel->status = MUSB_DMA_STATUS_UNKNOWN;
615
616         if (chdat->ch >= 0) {
617                 omap_stop_dma(chdat->ch);
618                 omap_free_dma(chdat->ch);
619                 chdat->ch = -1;
620         }
621
622         if (chdat->dmareq >= 0)
623                 tusb_omap_dma_free_dmareq(chdat);
624
625         channel = NULL;
626 }
627
628 void dma_controller_destroy(struct dma_controller *c)
629 {
630         struct tusb_omap_dma    *tusb_dma;
631         int                     i;
632
633         tusb_dma = container_of(c, struct tusb_omap_dma, controller);
634         for (i = 0; i < MAX_DMAREQ; i++) {
635                 struct dma_channel *ch = dma_channel_pool[i];
636                 if (ch) {
637                         kfree(ch->private_data);
638                         kfree(ch);
639                 }
640         }
641
642         if (tusb_dma && !tusb_dma->multichannel && tusb_dma->ch >= 0)
643                 omap_free_dma(tusb_dma->ch);
644
645         kfree(tusb_dma);
646 }
647
648 struct dma_controller *dma_controller_create(struct musb *musb, void __iomem *base)
649 {
650         void __iomem            *tbase = musb->ctrl_base;
651         struct tusb_omap_dma    *tusb_dma;
652         int                     i;
653
654         /* REVISIT: Get dmareq lines used from board-*.c */
655
656         musb_writel(musb->ctrl_base, TUSB_DMA_INT_MASK, 0x7fffffff);
657         musb_writel(musb->ctrl_base, TUSB_DMA_EP_MAP, 0);
658
659         musb_writel(tbase, TUSB_DMA_REQ_CONF,
660                 TUSB_DMA_REQ_CONF_BURST_SIZE(2)
661                 | TUSB_DMA_REQ_CONF_DMA_REQ_EN(0x3f)
662                 | TUSB_DMA_REQ_CONF_DMA_REQ_ASSER(2));
663
664         tusb_dma = kzalloc(sizeof(struct tusb_omap_dma), GFP_KERNEL);
665         if (!tusb_dma)
666                 goto out;
667
668         tusb_dma->musb = musb;
669         tusb_dma->tbase = musb->ctrl_base;
670
671         tusb_dma->ch = -1;
672         tusb_dma->dmareq = -1;
673         tusb_dma->sync_dev = -1;
674
675         tusb_dma->controller.channel_alloc = tusb_omap_dma_allocate;
676         tusb_dma->controller.channel_release = tusb_omap_dma_release;
677         tusb_dma->controller.channel_program = tusb_omap_dma_program;
678         tusb_dma->controller.channel_abort = tusb_omap_dma_abort;
679
680         if (musb->tusb_revision >= TUSB_REV_30)
681                 tusb_dma->multichannel = 1;
682
683         for (i = 0; i < MAX_DMAREQ; i++) {
684                 struct dma_channel      *ch;
685                 struct tusb_omap_dma_ch *chdat;
686
687                 ch = kzalloc(sizeof(struct dma_channel), GFP_KERNEL);
688                 if (!ch)
689                         goto cleanup;
690
691                 dma_channel_pool[i] = ch;
692
693                 chdat = kzalloc(sizeof(struct tusb_omap_dma_ch), GFP_KERNEL);
694                 if (!chdat)
695                         goto cleanup;
696
697                 ch->status = MUSB_DMA_STATUS_UNKNOWN;
698                 ch->private_data = chdat;
699         }
700
701         return &tusb_dma->controller;
702
703 cleanup:
704         dma_controller_destroy(&tusb_dma->controller);
705 out:
706         return NULL;
707 }