2 * ALSA PCM interface for the TI DAVINCI processor
4 * Author: Vladimir Barinov, <vbarinov@embeddedalley.com>
5 * Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.com>
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.
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/platform_device.h>
15 #include <linux/slab.h>
16 #include <linux/dma-mapping.h>
17 #include <linux/kernel.h>
19 #include <sound/core.h>
20 #include <sound/pcm.h>
21 #include <sound/pcm_params.h>
22 #include <sound/soc.h>
25 #include <mach/edma.h>
27 #include "davinci-pcm.h"
29 static struct snd_pcm_hardware davinci_pcm_hardware
= {
30 .info
= (SNDRV_PCM_INFO_INTERLEAVED
| SNDRV_PCM_INFO_BLOCK_TRANSFER
|
31 SNDRV_PCM_INFO_MMAP
| SNDRV_PCM_INFO_MMAP_VALID
|
32 SNDRV_PCM_INFO_PAUSE
),
33 .formats
= (SNDRV_PCM_FMTBIT_S16_LE
),
34 .rates
= (SNDRV_PCM_RATE_8000
| SNDRV_PCM_RATE_16000
|
35 SNDRV_PCM_RATE_22050
| SNDRV_PCM_RATE_32000
|
36 SNDRV_PCM_RATE_44100
| SNDRV_PCM_RATE_48000
|
37 SNDRV_PCM_RATE_88200
| SNDRV_PCM_RATE_96000
|
43 .buffer_bytes_max
= 128 * 1024,
44 .period_bytes_min
= 32,
45 .period_bytes_max
= 8 * 1024,
51 struct davinci_runtime_data
{
53 int period
; /* current DMA period */
54 int master_lch
; /* Master DMA channel */
55 int slave_lch
; /* linked parameter RAM reload slot */
56 struct davinci_pcm_dma_params
*params
; /* DMA params */
59 static void davinci_pcm_enqueue_dma(struct snd_pcm_substream
*substream
)
61 struct davinci_runtime_data
*prtd
= substream
->runtime
->private_data
;
62 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
63 int lch
= prtd
->slave_lch
;
64 unsigned int period_size
;
65 unsigned int dma_offset
;
68 unsigned short src_bidx
, dst_bidx
;
69 unsigned short src_cidx
, dst_cidx
;
70 unsigned int data_type
;
73 unsigned int fifo_level
;
75 period_size
= snd_pcm_lib_period_bytes(substream
);
76 dma_offset
= prtd
->period
* period_size
;
77 dma_pos
= runtime
->dma_addr
+ dma_offset
;
78 fifo_level
= prtd
->params
->fifo_level
;
80 pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d "
81 "dma_ptr = %x period_size=%x\n", lch
, dma_pos
, period_size
);
83 data_type
= prtd
->params
->data_type
;
84 count
= period_size
/ data_type
;
88 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
) {
90 dst
= prtd
->params
->dma_addr
;
93 src_cidx
= data_type
* fifo_level
;
96 src
= prtd
->params
->dma_addr
;
101 dst_cidx
= data_type
* fifo_level
;
104 acnt
= prtd
->params
->acnt
;
105 edma_set_src(lch
, src
, INCR
, W8BIT
);
106 edma_set_dest(lch
, dst
, INCR
, W8BIT
);
108 edma_set_src_index(lch
, src_bidx
, src_cidx
);
109 edma_set_dest_index(lch
, dst_bidx
, dst_cidx
);
112 edma_set_transfer_params(lch
, acnt
, count
, 1, 0, ASYNC
);
114 edma_set_transfer_params(lch
, acnt
, fifo_level
, count
,
118 if (unlikely(prtd
->period
>= runtime
->periods
))
122 static void davinci_pcm_dma_irq(unsigned lch
, u16 ch_status
, void *data
)
124 struct snd_pcm_substream
*substream
= data
;
125 struct davinci_runtime_data
*prtd
= substream
->runtime
->private_data
;
127 pr_debug("davinci_pcm: lch=%d, status=0x%x\n", lch
, ch_status
);
129 if (unlikely(ch_status
!= DMA_COMPLETE
))
132 if (snd_pcm_running(substream
)) {
133 snd_pcm_period_elapsed(substream
);
135 spin_lock(&prtd
->lock
);
136 davinci_pcm_enqueue_dma(substream
);
137 spin_unlock(&prtd
->lock
);
141 static int davinci_pcm_dma_request(struct snd_pcm_substream
*substream
)
143 struct davinci_runtime_data
*prtd
= substream
->runtime
->private_data
;
144 struct edmacc_param p_ram
;
147 /* Request master DMA channel */
148 ret
= edma_alloc_channel(prtd
->params
->channel
,
149 davinci_pcm_dma_irq
, substream
,
153 prtd
->master_lch
= ret
;
155 /* Request parameter RAM reload slot */
156 ret
= edma_alloc_slot(EDMA_SLOT_ANY
);
158 edma_free_channel(prtd
->master_lch
);
161 prtd
->slave_lch
= ret
;
163 /* Issue transfer completion IRQ when the channel completes a
164 * transfer, then always reload from the same slot (by a kind
165 * of loopback link). The completion IRQ handler will update
166 * the reload slot with a new buffer.
168 * REVISIT save p_ram here after setting up everything except
169 * the buffer and its length (ccnt) ... use it as a template
170 * so davinci_pcm_enqueue_dma() takes less time in IRQ.
172 edma_read_slot(prtd
->slave_lch
, &p_ram
);
173 p_ram
.opt
|= TCINTEN
| EDMA_TCC(prtd
->master_lch
);
174 p_ram
.link_bcntrld
= prtd
->slave_lch
<< 5;
175 edma_write_slot(prtd
->slave_lch
, &p_ram
);
180 static int davinci_pcm_trigger(struct snd_pcm_substream
*substream
, int cmd
)
182 struct davinci_runtime_data
*prtd
= substream
->runtime
->private_data
;
185 spin_lock(&prtd
->lock
);
188 case SNDRV_PCM_TRIGGER_START
:
189 case SNDRV_PCM_TRIGGER_RESUME
:
190 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE
:
191 edma_start(prtd
->master_lch
);
193 case SNDRV_PCM_TRIGGER_STOP
:
194 case SNDRV_PCM_TRIGGER_SUSPEND
:
195 case SNDRV_PCM_TRIGGER_PAUSE_PUSH
:
196 edma_stop(prtd
->master_lch
);
203 spin_unlock(&prtd
->lock
);
208 static int davinci_pcm_prepare(struct snd_pcm_substream
*substream
)
210 struct davinci_runtime_data
*prtd
= substream
->runtime
->private_data
;
211 struct edmacc_param temp
;
214 davinci_pcm_enqueue_dma(substream
);
216 /* Copy self-linked parameter RAM entry into master channel */
217 edma_read_slot(prtd
->slave_lch
, &temp
);
218 edma_write_slot(prtd
->master_lch
, &temp
);
219 davinci_pcm_enqueue_dma(substream
);
224 static snd_pcm_uframes_t
225 davinci_pcm_pointer(struct snd_pcm_substream
*substream
)
227 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
228 struct davinci_runtime_data
*prtd
= runtime
->private_data
;
233 spin_lock(&prtd
->lock
);
235 edma_get_position(prtd
->master_lch
, &src
, &dst
);
236 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
)
237 count
= src
- runtime
->dma_addr
;
239 count
= dst
- runtime
->dma_addr
;
241 spin_unlock(&prtd
->lock
);
243 offset
= bytes_to_frames(runtime
, count
);
244 if (offset
>= runtime
->buffer_size
)
250 static int davinci_pcm_open(struct snd_pcm_substream
*substream
)
252 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
253 struct davinci_runtime_data
*prtd
;
255 struct snd_soc_pcm_runtime
*rtd
= substream
->private_data
;
256 struct davinci_pcm_dma_params
*pa
= rtd
->dai
->cpu_dai
->private_data
;
257 struct davinci_pcm_dma_params
*params
= &pa
[substream
->stream
];
261 snd_soc_set_runtime_hwparams(substream
, &davinci_pcm_hardware
);
262 /* ensure that buffer size is a multiple of period size */
263 ret
= snd_pcm_hw_constraint_integer(runtime
,
264 SNDRV_PCM_HW_PARAM_PERIODS
);
268 prtd
= kzalloc(sizeof(struct davinci_runtime_data
), GFP_KERNEL
);
272 spin_lock_init(&prtd
->lock
);
273 prtd
->params
= params
;
275 runtime
->private_data
= prtd
;
277 ret
= davinci_pcm_dma_request(substream
);
279 printk(KERN_ERR
"davinci_pcm: Failed to get dma channels\n");
286 static int davinci_pcm_close(struct snd_pcm_substream
*substream
)
288 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
289 struct davinci_runtime_data
*prtd
= runtime
->private_data
;
291 edma_unlink(prtd
->slave_lch
);
293 edma_free_slot(prtd
->slave_lch
);
294 edma_free_channel(prtd
->master_lch
);
301 static int davinci_pcm_hw_params(struct snd_pcm_substream
*substream
,
302 struct snd_pcm_hw_params
*hw_params
)
304 return snd_pcm_lib_malloc_pages(substream
,
305 params_buffer_bytes(hw_params
));
308 static int davinci_pcm_hw_free(struct snd_pcm_substream
*substream
)
310 return snd_pcm_lib_free_pages(substream
);
313 static int davinci_pcm_mmap(struct snd_pcm_substream
*substream
,
314 struct vm_area_struct
*vma
)
316 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
318 return dma_mmap_writecombine(substream
->pcm
->card
->dev
, vma
,
324 static struct snd_pcm_ops davinci_pcm_ops
= {
325 .open
= davinci_pcm_open
,
326 .close
= davinci_pcm_close
,
327 .ioctl
= snd_pcm_lib_ioctl
,
328 .hw_params
= davinci_pcm_hw_params
,
329 .hw_free
= davinci_pcm_hw_free
,
330 .prepare
= davinci_pcm_prepare
,
331 .trigger
= davinci_pcm_trigger
,
332 .pointer
= davinci_pcm_pointer
,
333 .mmap
= davinci_pcm_mmap
,
336 static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm
*pcm
, int stream
)
338 struct snd_pcm_substream
*substream
= pcm
->streams
[stream
].substream
;
339 struct snd_dma_buffer
*buf
= &substream
->dma_buffer
;
340 size_t size
= davinci_pcm_hardware
.buffer_bytes_max
;
342 buf
->dev
.type
= SNDRV_DMA_TYPE_DEV
;
343 buf
->dev
.dev
= pcm
->card
->dev
;
344 buf
->private_data
= NULL
;
345 buf
->area
= dma_alloc_writecombine(pcm
->card
->dev
, size
,
346 &buf
->addr
, GFP_KERNEL
);
348 pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, "
349 "size=%d\n", (void *) buf
->area
, (void *) buf
->addr
, size
);
358 static void davinci_pcm_free(struct snd_pcm
*pcm
)
360 struct snd_pcm_substream
*substream
;
361 struct snd_dma_buffer
*buf
;
364 for (stream
= 0; stream
< 2; stream
++) {
365 substream
= pcm
->streams
[stream
].substream
;
369 buf
= &substream
->dma_buffer
;
373 dma_free_writecombine(pcm
->card
->dev
, buf
->bytes
,
374 buf
->area
, buf
->addr
);
379 static u64 davinci_pcm_dmamask
= 0xffffffff;
381 static int davinci_pcm_new(struct snd_card
*card
,
382 struct snd_soc_dai
*dai
, struct snd_pcm
*pcm
)
386 if (!card
->dev
->dma_mask
)
387 card
->dev
->dma_mask
= &davinci_pcm_dmamask
;
388 if (!card
->dev
->coherent_dma_mask
)
389 card
->dev
->coherent_dma_mask
= 0xffffffff;
391 if (dai
->playback
.channels_min
) {
392 ret
= davinci_pcm_preallocate_dma_buffer(pcm
,
393 SNDRV_PCM_STREAM_PLAYBACK
);
398 if (dai
->capture
.channels_min
) {
399 ret
= davinci_pcm_preallocate_dma_buffer(pcm
,
400 SNDRV_PCM_STREAM_CAPTURE
);
408 struct snd_soc_platform davinci_soc_platform
= {
409 .name
= "davinci-audio",
410 .pcm_ops
= &davinci_pcm_ops
,
411 .pcm_new
= davinci_pcm_new
,
412 .pcm_free
= davinci_pcm_free
,
414 EXPORT_SYMBOL_GPL(davinci_soc_platform
);
416 static int __init
davinci_soc_platform_init(void)
418 return snd_soc_register_platform(&davinci_soc_platform
);
420 module_init(davinci_soc_platform_init
);
422 static void __exit
davinci_soc_platform_exit(void)
424 snd_soc_unregister_platform(&davinci_soc_platform
);
426 module_exit(davinci_soc_platform_exit
);
428 MODULE_AUTHOR("Vladimir Barinov");
429 MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
430 MODULE_LICENSE("GPL");