ASoC: Fix a typo in jive_wm8750
[linux-2.6.git] / sound / soc / samsung / idma.c
1 /*
2  * sound/soc/samsung/idma.c
3  *
4  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
5  *              http://www.samsung.com
6  *
7  * I2S0's Internal DMA driver
8  *
9  * This program is free software; you can redistribute  it and/or modify it
10  * under  the terms of  the GNU General  Public License as published by the
11  * Free Software Foundation;  either version 2 of the  License, or (at your
12  * option) any later version.
13  */
14 #include <linux/interrupt.h>
15 #include <linux/platform_device.h>
16 #include <linux/dma-mapping.h>
17 #include <linux/slab.h>
18 #include <linux/module.h>
19 #include <sound/pcm.h>
20 #include <sound/pcm_params.h>
21 #include <sound/soc.h>
22
23 #include "i2s.h"
24 #include "idma.h"
25 #include "dma.h"
26 #include "i2s-regs.h"
27
28 #define ST_RUNNING              (1<<0)
29 #define ST_OPENED               (1<<1)
30
31 static const struct snd_pcm_hardware idma_hardware = {
32         .info = SNDRV_PCM_INFO_INTERLEAVED |
33                     SNDRV_PCM_INFO_BLOCK_TRANSFER |
34                     SNDRV_PCM_INFO_MMAP |
35                     SNDRV_PCM_INFO_MMAP_VALID |
36                     SNDRV_PCM_INFO_PAUSE |
37                     SNDRV_PCM_INFO_RESUME,
38         .formats = SNDRV_PCM_FMTBIT_S16_LE |
39                     SNDRV_PCM_FMTBIT_U16_LE |
40                     SNDRV_PCM_FMTBIT_S24_LE |
41                     SNDRV_PCM_FMTBIT_U24_LE |
42                     SNDRV_PCM_FMTBIT_U8 |
43                     SNDRV_PCM_FMTBIT_S8,
44         .channels_min = 2,
45         .channels_max = 2,
46         .buffer_bytes_max = MAX_IDMA_BUFFER,
47         .period_bytes_min = 128,
48         .period_bytes_max = MAX_IDMA_PERIOD,
49         .periods_min = 1,
50         .periods_max = 2,
51 };
52
53 struct idma_ctrl {
54         spinlock_t      lock;
55         int             state;
56         dma_addr_t      start;
57         dma_addr_t      pos;
58         dma_addr_t      end;
59         dma_addr_t      period;
60         dma_addr_t      periodsz;
61         void            *token;
62         void            (*cb)(void *dt, int bytes_xfer);
63 };
64
65 static struct idma_info {
66         spinlock_t      lock;
67         void             __iomem  *regs;
68         dma_addr_t      lp_tx_addr;
69 } idma;
70
71 static void idma_getpos(dma_addr_t *src)
72 {
73         *src = idma.lp_tx_addr +
74                 (readl(idma.regs + I2STRNCNT) & 0xffffff) * 4;
75 }
76
77 static int idma_enqueue(struct snd_pcm_substream *substream)
78 {
79         struct snd_pcm_runtime *runtime = substream->runtime;
80         struct idma_ctrl *prtd = substream->runtime->private_data;
81         u32 val;
82
83         spin_lock(&prtd->lock);
84         prtd->token = (void *) substream;
85         spin_unlock(&prtd->lock);
86
87         /* Internal DMA Level0 Interrupt Address */
88         val = idma.lp_tx_addr + prtd->periodsz;
89         writel(val, idma.regs + I2SLVL0ADDR);
90
91         /* Start address0 of I2S internal DMA operation. */
92         val = idma.lp_tx_addr;
93         writel(val, idma.regs + I2SSTR0);
94
95         /*
96          * Transfer block size for I2S internal DMA.
97          * Should decide transfer size before start dma operation
98          */
99         val = readl(idma.regs + I2SSIZE);
100         val &= ~(I2SSIZE_TRNMSK << I2SSIZE_SHIFT);
101         val |= (((runtime->dma_bytes >> 2) &
102                         I2SSIZE_TRNMSK) << I2SSIZE_SHIFT);
103         writel(val, idma.regs + I2SSIZE);
104
105         val = readl(idma.regs + I2SAHB);
106         val |= AHB_INTENLVL0;
107         writel(val, idma.regs + I2SAHB);
108
109         return 0;
110 }
111
112 static void idma_setcallbk(struct snd_pcm_substream *substream,
113                                 void (*cb)(void *, int))
114 {
115         struct idma_ctrl *prtd = substream->runtime->private_data;
116
117         spin_lock(&prtd->lock);
118         prtd->cb = cb;
119         spin_unlock(&prtd->lock);
120 }
121
122 static void idma_control(int op)
123 {
124         u32 val = readl(idma.regs + I2SAHB);
125
126         spin_lock(&idma.lock);
127
128         switch (op) {
129         case LPAM_DMA_START:
130                 val |= (AHB_INTENLVL0 | AHB_DMAEN);
131                 break;
132         case LPAM_DMA_STOP:
133                 val &= ~(AHB_INTENLVL0 | AHB_DMAEN);
134                 break;
135         default:
136                 spin_unlock(&idma.lock);
137                 return;
138         }
139
140         writel(val, idma.regs + I2SAHB);
141         spin_unlock(&idma.lock);
142 }
143
144 static void idma_done(void *id, int bytes_xfer)
145 {
146         struct snd_pcm_substream *substream = id;
147         struct idma_ctrl *prtd = substream->runtime->private_data;
148
149         if (prtd && (prtd->state & ST_RUNNING))
150                 snd_pcm_period_elapsed(substream);
151 }
152
153 static int idma_hw_params(struct snd_pcm_substream *substream,
154                                 struct snd_pcm_hw_params *params)
155 {
156         struct snd_pcm_runtime *runtime = substream->runtime;
157         struct idma_ctrl *prtd = substream->runtime->private_data;
158         u32 mod = readl(idma.regs + I2SMOD);
159         u32 ahb = readl(idma.regs + I2SAHB);
160
161         ahb |= (AHB_DMARLD | AHB_INTMASK);
162         mod |= MOD_TXS_IDMA;
163         writel(ahb, idma.regs + I2SAHB);
164         writel(mod, idma.regs + I2SMOD);
165
166         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
167         runtime->dma_bytes = params_buffer_bytes(params);
168
169         prtd->start = prtd->pos = runtime->dma_addr;
170         prtd->period = params_periods(params);
171         prtd->periodsz = params_period_bytes(params);
172         prtd->end = runtime->dma_addr + runtime->dma_bytes;
173
174         idma_setcallbk(substream, idma_done);
175
176         return 0;
177 }
178
179 static int idma_hw_free(struct snd_pcm_substream *substream)
180 {
181         snd_pcm_set_runtime_buffer(substream, NULL);
182
183         return 0;
184 }
185
186 static int idma_prepare(struct snd_pcm_substream *substream)
187 {
188         struct idma_ctrl *prtd = substream->runtime->private_data;
189
190         prtd->pos = prtd->start;
191
192         /* flush the DMA channel */
193         idma_control(LPAM_DMA_STOP);
194         idma_enqueue(substream);
195
196         return 0;
197 }
198
199 static int idma_trigger(struct snd_pcm_substream *substream, int cmd)
200 {
201         struct idma_ctrl *prtd = substream->runtime->private_data;
202         int ret = 0;
203
204         spin_lock(&prtd->lock);
205
206         switch (cmd) {
207         case SNDRV_PCM_TRIGGER_RESUME:
208         case SNDRV_PCM_TRIGGER_START:
209         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
210                 prtd->state |= ST_RUNNING;
211                 idma_control(LPAM_DMA_START);
212                 break;
213
214         case SNDRV_PCM_TRIGGER_SUSPEND:
215         case SNDRV_PCM_TRIGGER_STOP:
216         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
217                 prtd->state &= ~ST_RUNNING;
218                 idma_control(LPAM_DMA_STOP);
219                 break;
220
221         default:
222                 ret = -EINVAL;
223                 break;
224         }
225
226         spin_unlock(&prtd->lock);
227
228         return ret;
229 }
230
231 static snd_pcm_uframes_t
232         idma_pointer(struct snd_pcm_substream *substream)
233 {
234         struct snd_pcm_runtime *runtime = substream->runtime;
235         struct idma_ctrl *prtd = runtime->private_data;
236         dma_addr_t src;
237         unsigned long res;
238
239         spin_lock(&prtd->lock);
240
241         idma_getpos(&src);
242         res = src - prtd->start;
243
244         spin_unlock(&prtd->lock);
245
246         return bytes_to_frames(substream->runtime, res);
247 }
248
249 static int idma_mmap(struct snd_pcm_substream *substream,
250         struct vm_area_struct *vma)
251 {
252         struct snd_pcm_runtime *runtime = substream->runtime;
253         unsigned long size, offset;
254         int ret;
255
256         /* From snd_pcm_lib_mmap_iomem */
257         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
258         vma->vm_flags |= VM_IO;
259         size = vma->vm_end - vma->vm_start;
260         offset = vma->vm_pgoff << PAGE_SHIFT;
261         ret = io_remap_pfn_range(vma, vma->vm_start,
262                         (runtime->dma_addr + offset) >> PAGE_SHIFT,
263                         size, vma->vm_page_prot);
264
265         return ret;
266 }
267
268 static irqreturn_t iis_irq(int irqno, void *dev_id)
269 {
270         struct idma_ctrl *prtd = (struct idma_ctrl *)dev_id;
271         u32 iiscon, iisahb, val, addr;
272
273         iisahb  = readl(idma.regs + I2SAHB);
274         iiscon  = readl(idma.regs + I2SCON);
275
276         val = (iisahb & AHB_LVL0INT) ? AHB_CLRLVL0INT : 0;
277
278         if (val) {
279                 iisahb |= val;
280                 writel(iisahb, idma.regs + I2SAHB);
281
282                 addr = readl(idma.regs + I2SLVL0ADDR) - idma.lp_tx_addr;
283                 addr += prtd->periodsz;
284                 addr %= (prtd->end - prtd->start);
285                 addr += idma.lp_tx_addr;
286
287                 writel(addr, idma.regs + I2SLVL0ADDR);
288
289                 if (prtd->cb)
290                         prtd->cb(prtd->token, prtd->period);
291         }
292
293         return IRQ_HANDLED;
294 }
295
296 static int idma_open(struct snd_pcm_substream *substream)
297 {
298         struct snd_pcm_runtime *runtime = substream->runtime;
299         struct idma_ctrl *prtd;
300         int ret;
301
302         snd_soc_set_runtime_hwparams(substream, &idma_hardware);
303
304         prtd = kzalloc(sizeof(struct idma_ctrl), GFP_KERNEL);
305         if (prtd == NULL)
306                 return -ENOMEM;
307
308         ret = request_irq(IRQ_I2S0, iis_irq, 0, "i2s", prtd);
309         if (ret < 0) {
310                 pr_err("fail to claim i2s irq , ret = %d\n", ret);
311                 kfree(prtd);
312                 return ret;
313         }
314
315         spin_lock_init(&prtd->lock);
316
317         runtime->private_data = prtd;
318
319         return 0;
320 }
321
322 static int idma_close(struct snd_pcm_substream *substream)
323 {
324         struct snd_pcm_runtime *runtime = substream->runtime;
325         struct idma_ctrl *prtd = runtime->private_data;
326
327         free_irq(IRQ_I2S0, prtd);
328
329         if (!prtd)
330                 pr_err("idma_close called with prtd == NULL\n");
331
332         kfree(prtd);
333
334         return 0;
335 }
336
337 static struct snd_pcm_ops idma_ops = {
338         .open           = idma_open,
339         .close          = idma_close,
340         .ioctl          = snd_pcm_lib_ioctl,
341         .trigger        = idma_trigger,
342         .pointer        = idma_pointer,
343         .mmap           = idma_mmap,
344         .hw_params      = idma_hw_params,
345         .hw_free        = idma_hw_free,
346         .prepare        = idma_prepare,
347 };
348
349 static void idma_free(struct snd_pcm *pcm)
350 {
351         struct snd_pcm_substream *substream;
352         struct snd_dma_buffer *buf;
353
354         substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
355         if (!substream)
356                 return;
357
358         buf = &substream->dma_buffer;
359         if (!buf->area)
360                 return;
361
362         iounmap(buf->area);
363
364         buf->area = NULL;
365         buf->addr = 0;
366 }
367
368 static int preallocate_idma_buffer(struct snd_pcm *pcm, int stream)
369 {
370         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
371         struct snd_dma_buffer *buf = &substream->dma_buffer;
372
373         buf->dev.dev = pcm->card->dev;
374         buf->private_data = NULL;
375
376         /* Assign PCM buffer pointers */
377         buf->dev.type = SNDRV_DMA_TYPE_CONTINUOUS;
378         buf->addr = idma.lp_tx_addr;
379         buf->bytes = idma_hardware.buffer_bytes_max;
380         buf->area = (unsigned char *)ioremap(buf->addr, buf->bytes);
381
382         return 0;
383 }
384
385 static u64 idma_mask = DMA_BIT_MASK(32);
386
387 static int idma_new(struct snd_soc_pcm_runtime *rtd)
388 {
389         struct snd_card *card = rtd->card->snd_card;
390         struct snd_soc_dai *dai = rtd->cpu_dai;
391         struct snd_pcm *pcm = rtd->pcm;
392         int ret = 0;
393
394         if (!card->dev->dma_mask)
395                 card->dev->dma_mask = &idma_mask;
396         if (!card->dev->coherent_dma_mask)
397                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
398
399         if (dai->driver->playback.channels_min)
400                 ret = preallocate_idma_buffer(pcm,
401                                 SNDRV_PCM_STREAM_PLAYBACK);
402
403         return ret;
404 }
405
406 void idma_reg_addr_init(void *regs, dma_addr_t addr)
407 {
408         spin_lock_init(&idma.lock);
409         idma.regs = regs;
410         idma.lp_tx_addr = addr;
411 }
412
413 struct snd_soc_platform_driver asoc_idma_platform = {
414         .ops = &idma_ops,
415         .pcm_new = idma_new,
416         .pcm_free = idma_free,
417 };
418
419 static int __devinit asoc_idma_platform_probe(struct platform_device *pdev)
420 {
421         return snd_soc_register_platform(&pdev->dev, &asoc_idma_platform);
422 }
423
424 static int __devexit asoc_idma_platform_remove(struct platform_device *pdev)
425 {
426         snd_soc_unregister_platform(&pdev->dev);
427         return 0;
428 }
429
430 static struct platform_driver asoc_idma_driver = {
431         .driver = {
432                 .name = "samsung-idma",
433                 .owner = THIS_MODULE,
434         },
435
436         .probe = asoc_idma_platform_probe,
437         .remove = __devexit_p(asoc_idma_platform_remove),
438 };
439
440 static int __init asoc_idma_init(void)
441 {
442         return platform_driver_register(&asoc_idma_driver);
443 }
444 module_init(asoc_idma_init);
445
446 static void __exit asoc_idma_exit(void)
447 {
448         platform_driver_unregister(&asoc_idma_driver);
449 }
450 module_exit(asoc_idma_exit);
451
452 MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
453 MODULE_DESCRIPTION("Samsung ASoC IDMA Driver");
454 MODULE_LICENSE("GPL");