ASoC: samsung: WM8994 depends on MFD_WM8994
[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 <sound/pcm.h>
19 #include <sound/pcm_params.h>
20 #include <sound/soc.h>
21
22 #include "i2s.h"
23 #include "idma.h"
24 #include "dma.h"
25 #include "i2s-regs.h"
26
27 #define ST_RUNNING              (1<<0)
28 #define ST_OPENED               (1<<1)
29
30 static const struct snd_pcm_hardware idma_hardware = {
31         .info = SNDRV_PCM_INFO_INTERLEAVED |
32                     SNDRV_PCM_INFO_BLOCK_TRANSFER |
33                     SNDRV_PCM_INFO_MMAP |
34                     SNDRV_PCM_INFO_MMAP_VALID |
35                     SNDRV_PCM_INFO_PAUSE |
36                     SNDRV_PCM_INFO_RESUME,
37         .formats = SNDRV_PCM_FMTBIT_S16_LE |
38                     SNDRV_PCM_FMTBIT_U16_LE |
39                     SNDRV_PCM_FMTBIT_S24_LE |
40                     SNDRV_PCM_FMTBIT_U24_LE |
41                     SNDRV_PCM_FMTBIT_U8 |
42                     SNDRV_PCM_FMTBIT_S8,
43         .channels_min = 2,
44         .channels_max = 2,
45         .buffer_bytes_max = MAX_IDMA_BUFFER,
46         .period_bytes_min = 128,
47         .period_bytes_max = MAX_IDMA_PERIOD,
48         .periods_min = 1,
49         .periods_max = 2,
50 };
51
52 struct idma_ctrl {
53         spinlock_t      lock;
54         int             state;
55         dma_addr_t      start;
56         dma_addr_t      pos;
57         dma_addr_t      end;
58         dma_addr_t      period;
59         dma_addr_t      periodsz;
60         void            *token;
61         void            (*cb)(void *dt, int bytes_xfer);
62 };
63
64 static struct idma_info {
65         spinlock_t      lock;
66         void             __iomem  *regs;
67         dma_addr_t      lp_tx_addr;
68 } idma;
69
70 static void idma_getpos(dma_addr_t *src)
71 {
72         *src = idma.lp_tx_addr +
73                 (readl(idma.regs + I2STRNCNT) & 0xffffff) * 4;
74 }
75
76 static int idma_enqueue(struct snd_pcm_substream *substream)
77 {
78         struct snd_pcm_runtime *runtime = substream->runtime;
79         struct idma_ctrl *prtd = substream->runtime->private_data;
80         u32 val;
81
82         spin_lock(&prtd->lock);
83         prtd->token = (void *) substream;
84         spin_unlock(&prtd->lock);
85
86         /* Internal DMA Level0 Interrupt Address */
87         val = idma.lp_tx_addr + prtd->periodsz;
88         writel(val, idma.regs + I2SLVL0ADDR);
89
90         /* Start address0 of I2S internal DMA operation. */
91         val = idma.lp_tx_addr;
92         writel(val, idma.regs + I2SSTR0);
93
94         /*
95          * Transfer block size for I2S internal DMA.
96          * Should decide transfer size before start dma operation
97          */
98         val = readl(idma.regs + I2SSIZE);
99         val &= ~(I2SSIZE_TRNMSK << I2SSIZE_SHIFT);
100         val |= (((runtime->dma_bytes >> 2) &
101                         I2SSIZE_TRNMSK) << I2SSIZE_SHIFT);
102         writel(val, idma.regs + I2SSIZE);
103
104         val = readl(idma.regs + I2SAHB);
105         val |= AHB_INTENLVL0;
106         writel(val, idma.regs + I2SAHB);
107
108         return 0;
109 }
110
111 static void idma_setcallbk(struct snd_pcm_substream *substream,
112                                 void (*cb)(void *, int))
113 {
114         struct idma_ctrl *prtd = substream->runtime->private_data;
115
116         spin_lock(&prtd->lock);
117         prtd->cb = cb;
118         spin_unlock(&prtd->lock);
119 }
120
121 static void idma_control(int op)
122 {
123         u32 val = readl(idma.regs + I2SAHB);
124
125         spin_lock(&idma.lock);
126
127         switch (op) {
128         case LPAM_DMA_START:
129                 val |= (AHB_INTENLVL0 | AHB_DMAEN);
130                 break;
131         case LPAM_DMA_STOP:
132                 val &= ~(AHB_INTENLVL0 | AHB_DMAEN);
133                 break;
134         default:
135                 spin_unlock(&idma.lock);
136                 return;
137         }
138
139         writel(val, idma.regs + I2SAHB);
140         spin_unlock(&idma.lock);
141 }
142
143 static void idma_done(void *id, int bytes_xfer)
144 {
145         struct snd_pcm_substream *substream = id;
146         struct idma_ctrl *prtd = substream->runtime->private_data;
147
148         if (prtd && (prtd->state & ST_RUNNING))
149                 snd_pcm_period_elapsed(substream);
150 }
151
152 static int idma_hw_params(struct snd_pcm_substream *substream,
153                                 struct snd_pcm_hw_params *params)
154 {
155         struct snd_pcm_runtime *runtime = substream->runtime;
156         struct idma_ctrl *prtd = substream->runtime->private_data;
157         u32 mod = readl(idma.regs + I2SMOD);
158         u32 ahb = readl(idma.regs + I2SAHB);
159
160         ahb |= (AHB_DMARLD | AHB_INTMASK);
161         mod |= MOD_TXS_IDMA;
162         writel(ahb, idma.regs + I2SAHB);
163         writel(mod, idma.regs + I2SMOD);
164
165         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
166         runtime->dma_bytes = params_buffer_bytes(params);
167
168         prtd->start = prtd->pos = runtime->dma_addr;
169         prtd->period = params_periods(params);
170         prtd->periodsz = params_period_bytes(params);
171         prtd->end = runtime->dma_addr + runtime->dma_bytes;
172
173         idma_setcallbk(substream, idma_done);
174
175         return 0;
176 }
177
178 static int idma_hw_free(struct snd_pcm_substream *substream)
179 {
180         snd_pcm_set_runtime_buffer(substream, NULL);
181
182         return 0;
183 }
184
185 static int idma_prepare(struct snd_pcm_substream *substream)
186 {
187         struct idma_ctrl *prtd = substream->runtime->private_data;
188
189         prtd->pos = prtd->start;
190
191         /* flush the DMA channel */
192         idma_control(LPAM_DMA_STOP);
193         idma_enqueue(substream);
194
195         return 0;
196 }
197
198 static int idma_trigger(struct snd_pcm_substream *substream, int cmd)
199 {
200         struct idma_ctrl *prtd = substream->runtime->private_data;
201         int ret = 0;
202
203         spin_lock(&prtd->lock);
204
205         switch (cmd) {
206         case SNDRV_PCM_TRIGGER_RESUME:
207         case SNDRV_PCM_TRIGGER_START:
208         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
209                 prtd->state |= ST_RUNNING;
210                 idma_control(LPAM_DMA_START);
211                 break;
212
213         case SNDRV_PCM_TRIGGER_SUSPEND:
214         case SNDRV_PCM_TRIGGER_STOP:
215         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
216                 prtd->state &= ~ST_RUNNING;
217                 idma_control(LPAM_DMA_STOP);
218                 break;
219
220         default:
221                 ret = -EINVAL;
222                 break;
223         }
224
225         spin_unlock(&prtd->lock);
226
227         return ret;
228 }
229
230 static snd_pcm_uframes_t
231         idma_pointer(struct snd_pcm_substream *substream)
232 {
233         struct snd_pcm_runtime *runtime = substream->runtime;
234         struct idma_ctrl *prtd = runtime->private_data;
235         dma_addr_t src;
236         unsigned long res;
237
238         spin_lock(&prtd->lock);
239
240         idma_getpos(&src);
241         res = src - prtd->start;
242
243         spin_unlock(&prtd->lock);
244
245         return bytes_to_frames(substream->runtime, res);
246 }
247
248 static int idma_mmap(struct snd_pcm_substream *substream,
249         struct vm_area_struct *vma)
250 {
251         struct snd_pcm_runtime *runtime = substream->runtime;
252         unsigned long size, offset;
253         int ret;
254
255         /* From snd_pcm_lib_mmap_iomem */
256         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
257         vma->vm_flags |= VM_IO;
258         size = vma->vm_end - vma->vm_start;
259         offset = vma->vm_pgoff << PAGE_SHIFT;
260         ret = io_remap_pfn_range(vma, vma->vm_start,
261                         (runtime->dma_addr + offset) >> PAGE_SHIFT,
262                         size, vma->vm_page_prot);
263
264         return ret;
265 }
266
267 static irqreturn_t iis_irq(int irqno, void *dev_id)
268 {
269         struct idma_ctrl *prtd = (struct idma_ctrl *)dev_id;
270         u32 iiscon, iisahb, val, addr;
271
272         iisahb  = readl(idma.regs + I2SAHB);
273         iiscon  = readl(idma.regs + I2SCON);
274
275         val = (iisahb & AHB_LVL0INT) ? AHB_CLRLVL0INT : 0;
276
277         if (val) {
278                 iisahb |= val;
279                 writel(iisahb, idma.regs + I2SAHB);
280
281                 addr = readl(idma.regs + I2SLVL0ADDR) - idma.lp_tx_addr;
282                 addr += prtd->periodsz;
283                 addr %= (prtd->end - prtd->start);
284                 addr += idma.lp_tx_addr;
285
286                 writel(addr, idma.regs + I2SLVL0ADDR);
287
288                 if (prtd->cb)
289                         prtd->cb(prtd->token, prtd->period);
290         }
291
292         return IRQ_HANDLED;
293 }
294
295 static int idma_open(struct snd_pcm_substream *substream)
296 {
297         struct snd_pcm_runtime *runtime = substream->runtime;
298         struct idma_ctrl *prtd;
299         int ret;
300
301         snd_soc_set_runtime_hwparams(substream, &idma_hardware);
302
303         prtd = kzalloc(sizeof(struct idma_ctrl), GFP_KERNEL);
304         if (prtd == NULL)
305                 return -ENOMEM;
306
307         ret = request_irq(IRQ_I2S0, iis_irq, 0, "i2s", prtd);
308         if (ret < 0) {
309                 pr_err("fail to claim i2s irq , ret = %d\n", ret);
310                 kfree(prtd);
311                 return ret;
312         }
313
314         spin_lock_init(&prtd->lock);
315
316         runtime->private_data = prtd;
317
318         return 0;
319 }
320
321 static int idma_close(struct snd_pcm_substream *substream)
322 {
323         struct snd_pcm_runtime *runtime = substream->runtime;
324         struct idma_ctrl *prtd = runtime->private_data;
325
326         free_irq(IRQ_I2S0, prtd);
327
328         if (!prtd)
329                 pr_err("idma_close called with prtd == NULL\n");
330
331         kfree(prtd);
332
333         return 0;
334 }
335
336 static struct snd_pcm_ops idma_ops = {
337         .open           = idma_open,
338         .close          = idma_close,
339         .ioctl          = snd_pcm_lib_ioctl,
340         .trigger        = idma_trigger,
341         .pointer        = idma_pointer,
342         .mmap           = idma_mmap,
343         .hw_params      = idma_hw_params,
344         .hw_free        = idma_hw_free,
345         .prepare        = idma_prepare,
346 };
347
348 static void idma_free(struct snd_pcm *pcm)
349 {
350         struct snd_pcm_substream *substream;
351         struct snd_dma_buffer *buf;
352
353         substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
354         if (!substream)
355                 return;
356
357         buf = &substream->dma_buffer;
358         if (!buf->area)
359                 return;
360
361         iounmap(buf->area);
362
363         buf->area = NULL;
364         buf->addr = 0;
365 }
366
367 static int preallocate_idma_buffer(struct snd_pcm *pcm, int stream)
368 {
369         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
370         struct snd_dma_buffer *buf = &substream->dma_buffer;
371
372         buf->dev.dev = pcm->card->dev;
373         buf->private_data = NULL;
374
375         /* Assign PCM buffer pointers */
376         buf->dev.type = SNDRV_DMA_TYPE_CONTINUOUS;
377         buf->addr = idma.lp_tx_addr;
378         buf->bytes = idma_hardware.buffer_bytes_max;
379         buf->area = (unsigned char *)ioremap(buf->addr, buf->bytes);
380
381         return 0;
382 }
383
384 static u64 idma_mask = DMA_BIT_MASK(32);
385
386 static int idma_new(struct snd_soc_pcm_runtime *rtd)
387 {
388         struct snd_card *card = rtd->card->snd_card;
389         struct snd_soc_dai *dai = rtd->cpu_dai;
390         struct snd_pcm *pcm = rtd->pcm;
391         int ret = 0;
392
393         if (!card->dev->dma_mask)
394                 card->dev->dma_mask = &idma_mask;
395         if (!card->dev->coherent_dma_mask)
396                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
397
398         if (dai->driver->playback.channels_min)
399                 ret = preallocate_idma_buffer(pcm,
400                                 SNDRV_PCM_STREAM_PLAYBACK);
401
402         return ret;
403 }
404
405 void idma_reg_addr_init(void *regs, dma_addr_t addr)
406 {
407         spin_lock_init(&idma.lock);
408         idma.regs = regs;
409         idma.lp_tx_addr = addr;
410 }
411
412 struct snd_soc_platform_driver asoc_idma_platform = {
413         .ops = &idma_ops,
414         .pcm_new = idma_new,
415         .pcm_free = idma_free,
416 };
417
418 static int __devinit asoc_idma_platform_probe(struct platform_device *pdev)
419 {
420         return snd_soc_register_platform(&pdev->dev, &asoc_idma_platform);
421 }
422
423 static int __devexit asoc_idma_platform_remove(struct platform_device *pdev)
424 {
425         snd_soc_unregister_platform(&pdev->dev);
426         return 0;
427 }
428
429 static struct platform_driver asoc_idma_driver = {
430         .driver = {
431                 .name = "samsung-idma",
432                 .owner = THIS_MODULE,
433         },
434
435         .probe = asoc_idma_platform_probe,
436         .remove = __devexit_p(asoc_idma_platform_remove),
437 };
438
439 static int __init asoc_idma_init(void)
440 {
441         return platform_driver_register(&asoc_idma_driver);
442 }
443 module_init(asoc_idma_init);
444
445 static void __exit asoc_idma_exit(void)
446 {
447         platform_driver_unregister(&asoc_idma_driver);
448 }
449 module_exit(asoc_idma_exit);
450
451 MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
452 MODULE_DESCRIPTION("Samsung ASoC IDMA Driver");
453 MODULE_LICENSE("GPL");