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Manuel Lauss4a161d22008-07-09 16:27:56 +02001/*
2 * Au12x0/Au1550 PSC ALSA ASoC audio support.
3 *
4 * (c) 2007-2008 MSC Vertriebsges.m.b.H.,
Manuel Lauss0f83d632009-10-31 20:15:08 +01005 * Manuel Lauss <manuel.lauss@gmail.com>
Manuel Lauss4a161d22008-07-09 16:27:56 +02006 *
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 * DMA glue for Au1x-PSC audio.
12 *
Manuel Lauss4a161d22008-07-09 16:27:56 +020013 */
14
15
16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/platform_device.h>
19#include <linux/slab.h>
20#include <linux/dma-mapping.h>
21
22#include <sound/core.h>
23#include <sound/pcm.h>
24#include <sound/pcm_params.h>
25#include <sound/soc.h>
26
27#include <asm/mach-au1x00/au1000.h>
28#include <asm/mach-au1x00/au1xxx_dbdma.h>
29#include <asm/mach-au1x00/au1xxx_psc.h>
30
31#include "psc.h"
32
33/*#define PCM_DEBUG*/
34
35#define MSG(x...) printk(KERN_INFO "au1xpsc_pcm: " x)
36#ifdef PCM_DEBUG
37#define DBG MSG
38#else
39#define DBG(x...) do {} while (0)
40#endif
41
42struct au1xpsc_audio_dmadata {
43 /* DDMA control data */
44 unsigned int ddma_id; /* DDMA direction ID for this PSC */
45 u32 ddma_chan; /* DDMA context */
46
47 /* PCM context (for irq handlers) */
48 struct snd_pcm_substream *substream;
49 unsigned long curr_period; /* current segment DDMA is working on */
50 unsigned long q_period; /* queue period(s) */
Manuel Lauss963accb2009-10-13 20:22:35 +020051 dma_addr_t dma_area; /* address of queued DMA area */
52 dma_addr_t dma_area_s; /* start address of DMA area */
Manuel Lauss4a161d22008-07-09 16:27:56 +020053 unsigned long pos; /* current byte position being played */
54 unsigned long periods; /* number of SG segments in total */
55 unsigned long period_bytes; /* size in bytes of one SG segment */
56
57 /* runtime data */
58 int msbits;
59};
60
Manuel Lauss4a161d22008-07-09 16:27:56 +020061/*
62 * These settings are somewhat okay, at least on my machine audio plays
63 * almost skip-free. Especially the 64kB buffer seems to help a LOT.
64 */
65#define AU1XPSC_PERIOD_MIN_BYTES 1024
66#define AU1XPSC_BUFFER_MIN_BYTES 65536
67
68#define AU1XPSC_PCM_FMTS \
69 (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 | \
70 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | \
71 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE | \
72 SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE | \
73 SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_U32_BE | \
74 0)
75
76/* PCM hardware DMA capabilities - platform specific */
77static const struct snd_pcm_hardware au1xpsc_pcm_hardware = {
78 .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
Takashi Iwai2008f132009-04-28 12:25:59 +020079 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BATCH,
Manuel Lauss4a161d22008-07-09 16:27:56 +020080 .formats = AU1XPSC_PCM_FMTS,
81 .period_bytes_min = AU1XPSC_PERIOD_MIN_BYTES,
82 .period_bytes_max = 4096 * 1024 - 1,
83 .periods_min = 2,
84 .periods_max = 4096, /* 2 to as-much-as-you-like */
85 .buffer_bytes_max = 4096 * 1024 - 1,
86 .fifo_size = 16, /* fifo entries of AC97/I2S PSC */
87};
88
89static void au1x_pcm_queue_tx(struct au1xpsc_audio_dmadata *cd)
90{
Manuel Lauss963accb2009-10-13 20:22:35 +020091 au1xxx_dbdma_put_source(cd->ddma_chan, cd->dma_area,
Manuel Lauss4a161d22008-07-09 16:27:56 +020092 cd->period_bytes, DDMA_FLAGS_IE);
93
94 /* update next-to-queue period */
95 ++cd->q_period;
96 cd->dma_area += cd->period_bytes;
97 if (cd->q_period >= cd->periods) {
98 cd->q_period = 0;
99 cd->dma_area = cd->dma_area_s;
100 }
101}
102
103static void au1x_pcm_queue_rx(struct au1xpsc_audio_dmadata *cd)
104{
Manuel Lauss963accb2009-10-13 20:22:35 +0200105 au1xxx_dbdma_put_dest(cd->ddma_chan, cd->dma_area,
Manuel Laussea071cc2009-10-13 20:22:34 +0200106 cd->period_bytes, DDMA_FLAGS_IE);
Manuel Lauss4a161d22008-07-09 16:27:56 +0200107
108 /* update next-to-queue period */
109 ++cd->q_period;
110 cd->dma_area += cd->period_bytes;
111 if (cd->q_period >= cd->periods) {
112 cd->q_period = 0;
113 cd->dma_area = cd->dma_area_s;
114 }
115}
116
117static void au1x_pcm_dmatx_cb(int irq, void *dev_id)
118{
119 struct au1xpsc_audio_dmadata *cd = dev_id;
120
121 cd->pos += cd->period_bytes;
122 if (++cd->curr_period >= cd->periods) {
123 cd->pos = 0;
124 cd->curr_period = 0;
125 }
126 snd_pcm_period_elapsed(cd->substream);
127 au1x_pcm_queue_tx(cd);
128}
129
130static void au1x_pcm_dmarx_cb(int irq, void *dev_id)
131{
132 struct au1xpsc_audio_dmadata *cd = dev_id;
133
134 cd->pos += cd->period_bytes;
135 if (++cd->curr_period >= cd->periods) {
136 cd->pos = 0;
137 cd->curr_period = 0;
138 }
139 snd_pcm_period_elapsed(cd->substream);
140 au1x_pcm_queue_rx(cd);
141}
142
143static void au1x_pcm_dbdma_free(struct au1xpsc_audio_dmadata *pcd)
144{
145 if (pcd->ddma_chan) {
146 au1xxx_dbdma_stop(pcd->ddma_chan);
147 au1xxx_dbdma_reset(pcd->ddma_chan);
148 au1xxx_dbdma_chan_free(pcd->ddma_chan);
149 pcd->ddma_chan = 0;
150 pcd->msbits = 0;
151 }
152}
153
154/* in case of missing DMA ring or changed TX-source / RX-dest bit widths,
155 * allocate (or reallocate) a 2-descriptor DMA ring with bit depth according
156 * to ALSA-supplied sample depth. This is due to limitations in the dbdma api
157 * (cannot adjust source/dest widths of already allocated descriptor ring).
158 */
159static int au1x_pcm_dbdma_realloc(struct au1xpsc_audio_dmadata *pcd,
160 int stype, int msbits)
161{
162 /* DMA only in 8/16/32 bit widths */
163 if (msbits == 24)
164 msbits = 32;
165
166 /* check current config: correct bits and descriptors allocated? */
167 if ((pcd->ddma_chan) && (msbits == pcd->msbits))
168 goto out; /* all ok! */
169
170 au1x_pcm_dbdma_free(pcd);
171
Manuel Lauss25942fd2011-07-25 13:45:04 +0200172 if (stype == SNDRV_PCM_STREAM_CAPTURE)
Manuel Lauss4a161d22008-07-09 16:27:56 +0200173 pcd->ddma_chan = au1xxx_dbdma_chan_alloc(pcd->ddma_id,
174 DSCR_CMD0_ALWAYS,
175 au1x_pcm_dmarx_cb, (void *)pcd);
176 else
177 pcd->ddma_chan = au1xxx_dbdma_chan_alloc(DSCR_CMD0_ALWAYS,
178 pcd->ddma_id,
179 au1x_pcm_dmatx_cb, (void *)pcd);
180
181 if (!pcd->ddma_chan)
Fernando Carrijoc19a28e2009-01-07 18:09:08 -0800182 return -ENOMEM;
Manuel Lauss4a161d22008-07-09 16:27:56 +0200183
184 au1xxx_dbdma_set_devwidth(pcd->ddma_chan, msbits);
185 au1xxx_dbdma_ring_alloc(pcd->ddma_chan, 2);
186
187 pcd->msbits = msbits;
188
189 au1xxx_dbdma_stop(pcd->ddma_chan);
190 au1xxx_dbdma_reset(pcd->ddma_chan);
191
192out:
193 return 0;
194}
195
Manuel Laussffc4fdb2010-08-26 14:53:51 +0200196static inline struct au1xpsc_audio_dmadata *to_dmadata(struct snd_pcm_substream *ss)
197{
198 struct snd_soc_pcm_runtime *rtd = ss->private_data;
199 struct au1xpsc_audio_dmadata *pcd =
200 snd_soc_platform_get_drvdata(rtd->platform);
Manuel Lauss25942fd2011-07-25 13:45:04 +0200201 return &pcd[ss->stream];
Manuel Laussffc4fdb2010-08-26 14:53:51 +0200202}
203
Manuel Lauss4a161d22008-07-09 16:27:56 +0200204static int au1xpsc_pcm_hw_params(struct snd_pcm_substream *substream,
205 struct snd_pcm_hw_params *params)
206{
207 struct snd_pcm_runtime *runtime = substream->runtime;
208 struct au1xpsc_audio_dmadata *pcd;
209 int stype, ret;
210
211 ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
212 if (ret < 0)
213 goto out;
214
Manuel Lauss25942fd2011-07-25 13:45:04 +0200215 stype = substream->stream;
Manuel Laussffc4fdb2010-08-26 14:53:51 +0200216 pcd = to_dmadata(substream);
Manuel Lauss4a161d22008-07-09 16:27:56 +0200217
218 DBG("runtime->dma_area = 0x%08lx dma_addr_t = 0x%08lx dma_size = %d "
219 "runtime->min_align %d\n",
220 (unsigned long)runtime->dma_area,
221 (unsigned long)runtime->dma_addr, runtime->dma_bytes,
222 runtime->min_align);
223
224 DBG("bits %d frags %d frag_bytes %d is_rx %d\n", params->msbits,
225 params_periods(params), params_period_bytes(params), stype);
226
227 ret = au1x_pcm_dbdma_realloc(pcd, stype, params->msbits);
228 if (ret) {
229 MSG("DDMA channel (re)alloc failed!\n");
230 goto out;
231 }
232
233 pcd->substream = substream;
234 pcd->period_bytes = params_period_bytes(params);
235 pcd->periods = params_periods(params);
Manuel Lauss963accb2009-10-13 20:22:35 +0200236 pcd->dma_area_s = pcd->dma_area = runtime->dma_addr;
Manuel Lauss4a161d22008-07-09 16:27:56 +0200237 pcd->q_period = 0;
238 pcd->curr_period = 0;
239 pcd->pos = 0;
240
241 ret = 0;
242out:
243 return ret;
244}
245
246static int au1xpsc_pcm_hw_free(struct snd_pcm_substream *substream)
247{
248 snd_pcm_lib_free_pages(substream);
249 return 0;
250}
251
252static int au1xpsc_pcm_prepare(struct snd_pcm_substream *substream)
253{
Manuel Laussffc4fdb2010-08-26 14:53:51 +0200254 struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream);
Manuel Lauss4a161d22008-07-09 16:27:56 +0200255
256 au1xxx_dbdma_reset(pcd->ddma_chan);
257
Manuel Lauss25942fd2011-07-25 13:45:04 +0200258 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
Manuel Lauss4a161d22008-07-09 16:27:56 +0200259 au1x_pcm_queue_rx(pcd);
260 au1x_pcm_queue_rx(pcd);
261 } else {
262 au1x_pcm_queue_tx(pcd);
263 au1x_pcm_queue_tx(pcd);
264 }
265
266 return 0;
267}
268
269static int au1xpsc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
270{
Manuel Laussffc4fdb2010-08-26 14:53:51 +0200271 u32 c = to_dmadata(substream)->ddma_chan;
Manuel Lauss4a161d22008-07-09 16:27:56 +0200272
273 switch (cmd) {
274 case SNDRV_PCM_TRIGGER_START:
275 case SNDRV_PCM_TRIGGER_RESUME:
276 au1xxx_dbdma_start(c);
277 break;
278 case SNDRV_PCM_TRIGGER_STOP:
279 case SNDRV_PCM_TRIGGER_SUSPEND:
280 au1xxx_dbdma_stop(c);
281 break;
282 default:
283 return -EINVAL;
284 }
285 return 0;
286}
287
288static snd_pcm_uframes_t
289au1xpsc_pcm_pointer(struct snd_pcm_substream *substream)
290{
Manuel Laussffc4fdb2010-08-26 14:53:51 +0200291 return bytes_to_frames(substream->runtime, to_dmadata(substream)->pos);
Manuel Lauss4a161d22008-07-09 16:27:56 +0200292}
293
294static int au1xpsc_pcm_open(struct snd_pcm_substream *substream)
295{
Manuel Lauss5b0912b2011-07-25 13:45:02 +0200296 struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream);
297 struct snd_soc_pcm_runtime *rtd = substream->private_data;
Manuel Lauss25942fd2011-07-25 13:45:04 +0200298 int stype = substream->stream, *dmaids;
Manuel Lauss5b0912b2011-07-25 13:45:02 +0200299
300 dmaids = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
301 if (!dmaids)
302 return -ENODEV; /* whoa, has ordering changed? */
303
304 pcd->ddma_id = dmaids[stype];
305
Manuel Lauss4a161d22008-07-09 16:27:56 +0200306 snd_soc_set_runtime_hwparams(substream, &au1xpsc_pcm_hardware);
307 return 0;
308}
309
310static int au1xpsc_pcm_close(struct snd_pcm_substream *substream)
311{
Manuel Laussffc4fdb2010-08-26 14:53:51 +0200312 au1x_pcm_dbdma_free(to_dmadata(substream));
Manuel Lauss4a161d22008-07-09 16:27:56 +0200313 return 0;
314}
315
Mark Brownb2a19d02009-01-17 19:14:26 +0000316static struct snd_pcm_ops au1xpsc_pcm_ops = {
Manuel Lauss4a161d22008-07-09 16:27:56 +0200317 .open = au1xpsc_pcm_open,
318 .close = au1xpsc_pcm_close,
319 .ioctl = snd_pcm_lib_ioctl,
320 .hw_params = au1xpsc_pcm_hw_params,
321 .hw_free = au1xpsc_pcm_hw_free,
322 .prepare = au1xpsc_pcm_prepare,
323 .trigger = au1xpsc_pcm_trigger,
324 .pointer = au1xpsc_pcm_pointer,
325};
326
327static void au1xpsc_pcm_free_dma_buffers(struct snd_pcm *pcm)
328{
329 snd_pcm_lib_preallocate_free_for_all(pcm);
330}
331
Liam Girdwood552d1ef2011-06-07 16:08:33 +0100332static int au1xpsc_pcm_new(struct snd_soc_pcm_runtime *rtd)
Manuel Lauss4a161d22008-07-09 16:27:56 +0200333{
Liam Girdwood552d1ef2011-06-07 16:08:33 +0100334 struct snd_card *card = rtd->card->snd_card;
335 struct snd_pcm *pcm = rtd->pcm;
336
Manuel Lauss4a161d22008-07-09 16:27:56 +0200337 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
338 card->dev, AU1XPSC_BUFFER_MIN_BYTES, (4096 * 1024) - 1);
339
340 return 0;
341}
342
Manuel Lauss0f83d632009-10-31 20:15:08 +0100343/* au1xpsc audio platform */
Axel Linbba59f32011-12-13 10:14:30 +0800344static struct snd_soc_platform_driver au1xpsc_soc_platform = {
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000345 .ops = &au1xpsc_pcm_ops,
Manuel Lauss0f83d632009-10-31 20:15:08 +0100346 .pcm_new = au1xpsc_pcm_new,
347 .pcm_free = au1xpsc_pcm_free_dma_buffers,
348};
Manuel Lauss0f83d632009-10-31 20:15:08 +0100349
Bill Pemberton5c658be2012-12-07 09:26:22 -0500350static int au1xpsc_pcm_drvprobe(struct platform_device *pdev)
Manuel Lauss0f83d632009-10-31 20:15:08 +0100351{
Manuel Laussffc4fdb2010-08-26 14:53:51 +0200352 struct au1xpsc_audio_dmadata *dmadata;
Manuel Lauss4a161d22008-07-09 16:27:56 +0200353
Julia Lawallbe547dd2011-12-29 17:51:28 +0100354 dmadata = devm_kzalloc(&pdev->dev,
355 2 * sizeof(struct au1xpsc_audio_dmadata),
356 GFP_KERNEL);
Manuel Laussffc4fdb2010-08-26 14:53:51 +0200357 if (!dmadata)
Manuel Lauss4a161d22008-07-09 16:27:56 +0200358 return -ENOMEM;
359
Manuel Laussffc4fdb2010-08-26 14:53:51 +0200360 platform_set_drvdata(pdev, dmadata);
Manuel Lauss4a161d22008-07-09 16:27:56 +0200361
Julia Lawallbe547dd2011-12-29 17:51:28 +0100362 return snd_soc_register_platform(&pdev->dev, &au1xpsc_soc_platform);
Manuel Lauss4a161d22008-07-09 16:27:56 +0200363}
364
Bill Pemberton5c658be2012-12-07 09:26:22 -0500365static int au1xpsc_pcm_drvremove(struct platform_device *pdev)
Manuel Lauss4a161d22008-07-09 16:27:56 +0200366{
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000367 snd_soc_unregister_platform(&pdev->dev);
Manuel Lauss4a161d22008-07-09 16:27:56 +0200368
369 return 0;
370}
371
Manuel Lauss0f83d632009-10-31 20:15:08 +0100372static struct platform_driver au1xpsc_pcm_driver = {
373 .driver = {
Manuel Laussffc4fdb2010-08-26 14:53:51 +0200374 .name = "au1xpsc-pcm",
Manuel Lauss0f83d632009-10-31 20:15:08 +0100375 .owner = THIS_MODULE,
376 },
377 .probe = au1xpsc_pcm_drvprobe,
Bill Pemberton5c658be2012-12-07 09:26:22 -0500378 .remove = au1xpsc_pcm_drvremove,
Manuel Lauss4a161d22008-07-09 16:27:56 +0200379};
Manuel Lauss4a161d22008-07-09 16:27:56 +0200380
Axel Lin8a124f92011-11-25 10:06:59 +0800381module_platform_driver(au1xpsc_pcm_driver);
Manuel Lauss0f83d632009-10-31 20:15:08 +0100382
Manuel Lauss4a161d22008-07-09 16:27:56 +0200383MODULE_LICENSE("GPL");
384MODULE_DESCRIPTION("Au12x0/Au1550 PSC Audio DMA driver");
Manuel Lauss0f83d632009-10-31 20:15:08 +0100385MODULE_AUTHOR("Manuel Lauss");