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Linux/sound/soc/au1x/dbdma2.c

  1 /*
  2  * Au12x0/Au1550 PSC ALSA ASoC audio support.
  3  *
  4  * (c) 2007-2008 MSC Vertriebsges.m.b.H.,
  5  *      Manuel Lauss <manuel.lauss@gmail.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  * DMA glue for Au1x-PSC audio.
 12  *
 13  */
 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 
 42 struct 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) */
 51         dma_addr_t dma_area;            /* address of queued DMA area */
 52         dma_addr_t dma_area_s;          /* start address of DMA area */
 53         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 
 61 /*
 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 /* PCM hardware DMA capabilities - platform specific */
 69 static const struct snd_pcm_hardware au1xpsc_pcm_hardware = {
 70         .info             = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
 71                             SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BATCH,
 72         .period_bytes_min = AU1XPSC_PERIOD_MIN_BYTES,
 73         .period_bytes_max = 4096 * 1024 - 1,
 74         .periods_min      = 2,
 75         .periods_max      = 4096,       /* 2 to as-much-as-you-like */
 76         .buffer_bytes_max = 4096 * 1024 - 1,
 77         .fifo_size        = 16,         /* fifo entries of AC97/I2S PSC */
 78 };
 79 
 80 static void au1x_pcm_queue_tx(struct au1xpsc_audio_dmadata *cd)
 81 {
 82         au1xxx_dbdma_put_source(cd->ddma_chan, cd->dma_area,
 83                                 cd->period_bytes, DDMA_FLAGS_IE);
 84 
 85         /* update next-to-queue period */
 86         ++cd->q_period;
 87         cd->dma_area += cd->period_bytes;
 88         if (cd->q_period >= cd->periods) {
 89                 cd->q_period = 0;
 90                 cd->dma_area = cd->dma_area_s;
 91         }
 92 }
 93 
 94 static void au1x_pcm_queue_rx(struct au1xpsc_audio_dmadata *cd)
 95 {
 96         au1xxx_dbdma_put_dest(cd->ddma_chan, cd->dma_area,
 97                               cd->period_bytes, DDMA_FLAGS_IE);
 98 
 99         /* update next-to-queue period */
100         ++cd->q_period;
101         cd->dma_area += cd->period_bytes;
102         if (cd->q_period >= cd->periods) {
103                 cd->q_period = 0;
104                 cd->dma_area = cd->dma_area_s;
105         }
106 }
107 
108 static void au1x_pcm_dmatx_cb(int irq, void *dev_id)
109 {
110         struct au1xpsc_audio_dmadata *cd = dev_id;
111 
112         cd->pos += cd->period_bytes;
113         if (++cd->curr_period >= cd->periods) {
114                 cd->pos = 0;
115                 cd->curr_period = 0;
116         }
117         snd_pcm_period_elapsed(cd->substream);
118         au1x_pcm_queue_tx(cd);
119 }
120 
121 static void au1x_pcm_dmarx_cb(int irq, void *dev_id)
122 {
123         struct au1xpsc_audio_dmadata *cd = dev_id;
124 
125         cd->pos += cd->period_bytes;
126         if (++cd->curr_period >= cd->periods) {
127                 cd->pos = 0;
128                 cd->curr_period = 0;
129         }
130         snd_pcm_period_elapsed(cd->substream);
131         au1x_pcm_queue_rx(cd);
132 }
133 
134 static void au1x_pcm_dbdma_free(struct au1xpsc_audio_dmadata *pcd)
135 {
136         if (pcd->ddma_chan) {
137                 au1xxx_dbdma_stop(pcd->ddma_chan);
138                 au1xxx_dbdma_reset(pcd->ddma_chan);
139                 au1xxx_dbdma_chan_free(pcd->ddma_chan);
140                 pcd->ddma_chan = 0;
141                 pcd->msbits = 0;
142         }
143 }
144 
145 /* in case of missing DMA ring or changed TX-source / RX-dest bit widths,
146  * allocate (or reallocate) a 2-descriptor DMA ring with bit depth according
147  * to ALSA-supplied sample depth.  This is due to limitations in the dbdma api
148  * (cannot adjust source/dest widths of already allocated descriptor ring).
149  */
150 static int au1x_pcm_dbdma_realloc(struct au1xpsc_audio_dmadata *pcd,
151                                  int stype, int msbits)
152 {
153         /* DMA only in 8/16/32 bit widths */
154         if (msbits == 24)
155                 msbits = 32;
156 
157         /* check current config: correct bits and descriptors allocated? */
158         if ((pcd->ddma_chan) && (msbits == pcd->msbits))
159                 goto out;       /* all ok! */
160 
161         au1x_pcm_dbdma_free(pcd);
162 
163         if (stype == SNDRV_PCM_STREAM_CAPTURE)
164                 pcd->ddma_chan = au1xxx_dbdma_chan_alloc(pcd->ddma_id,
165                                         DSCR_CMD0_ALWAYS,
166                                         au1x_pcm_dmarx_cb, (void *)pcd);
167         else
168                 pcd->ddma_chan = au1xxx_dbdma_chan_alloc(DSCR_CMD0_ALWAYS,
169                                         pcd->ddma_id,
170                                         au1x_pcm_dmatx_cb, (void *)pcd);
171 
172         if (!pcd->ddma_chan)
173                 return -ENOMEM;
174 
175         au1xxx_dbdma_set_devwidth(pcd->ddma_chan, msbits);
176         au1xxx_dbdma_ring_alloc(pcd->ddma_chan, 2);
177 
178         pcd->msbits = msbits;
179 
180         au1xxx_dbdma_stop(pcd->ddma_chan);
181         au1xxx_dbdma_reset(pcd->ddma_chan);
182 
183 out:
184         return 0;
185 }
186 
187 static inline struct au1xpsc_audio_dmadata *to_dmadata(struct snd_pcm_substream *ss)
188 {
189         struct snd_soc_pcm_runtime *rtd = ss->private_data;
190         struct au1xpsc_audio_dmadata *pcd =
191                                 snd_soc_platform_get_drvdata(rtd->platform);
192         return &pcd[ss->stream];
193 }
194 
195 static int au1xpsc_pcm_hw_params(struct snd_pcm_substream *substream,
196                                  struct snd_pcm_hw_params *params)
197 {
198         struct snd_pcm_runtime *runtime = substream->runtime;
199         struct au1xpsc_audio_dmadata *pcd;
200         int stype, ret;
201 
202         ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
203         if (ret < 0)
204                 goto out;
205 
206         stype = substream->stream;
207         pcd = to_dmadata(substream);
208 
209         DBG("runtime->dma_area = 0x%08lx dma_addr_t = 0x%08lx dma_size = %d "
210             "runtime->min_align %d\n",
211                 (unsigned long)runtime->dma_area,
212                 (unsigned long)runtime->dma_addr, runtime->dma_bytes,
213                 runtime->min_align);
214 
215         DBG("bits %d  frags %d  frag_bytes %d  is_rx %d\n", params->msbits,
216                 params_periods(params), params_period_bytes(params), stype);
217 
218         ret = au1x_pcm_dbdma_realloc(pcd, stype, params->msbits);
219         if (ret) {
220                 MSG("DDMA channel (re)alloc failed!\n");
221                 goto out;
222         }
223 
224         pcd->substream = substream;
225         pcd->period_bytes = params_period_bytes(params);
226         pcd->periods = params_periods(params);
227         pcd->dma_area_s = pcd->dma_area = runtime->dma_addr;
228         pcd->q_period = 0;
229         pcd->curr_period = 0;
230         pcd->pos = 0;
231 
232         ret = 0;
233 out:
234         return ret;
235 }
236 
237 static int au1xpsc_pcm_hw_free(struct snd_pcm_substream *substream)
238 {
239         snd_pcm_lib_free_pages(substream);
240         return 0;
241 }
242 
243 static int au1xpsc_pcm_prepare(struct snd_pcm_substream *substream)
244 {
245         struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream);
246 
247         au1xxx_dbdma_reset(pcd->ddma_chan);
248 
249         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
250                 au1x_pcm_queue_rx(pcd);
251                 au1x_pcm_queue_rx(pcd);
252         } else {
253                 au1x_pcm_queue_tx(pcd);
254                 au1x_pcm_queue_tx(pcd);
255         }
256 
257         return 0;
258 }
259 
260 static int au1xpsc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
261 {
262         u32 c = to_dmadata(substream)->ddma_chan;
263 
264         switch (cmd) {
265         case SNDRV_PCM_TRIGGER_START:
266         case SNDRV_PCM_TRIGGER_RESUME:
267                 au1xxx_dbdma_start(c);
268                 break;
269         case SNDRV_PCM_TRIGGER_STOP:
270         case SNDRV_PCM_TRIGGER_SUSPEND:
271                 au1xxx_dbdma_stop(c);
272                 break;
273         default:
274                 return -EINVAL;
275         }
276         return 0;
277 }
278 
279 static snd_pcm_uframes_t
280 au1xpsc_pcm_pointer(struct snd_pcm_substream *substream)
281 {
282         return bytes_to_frames(substream->runtime, to_dmadata(substream)->pos);
283 }
284 
285 static int au1xpsc_pcm_open(struct snd_pcm_substream *substream)
286 {
287         struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream);
288         struct snd_soc_pcm_runtime *rtd = substream->private_data;
289         int stype = substream->stream, *dmaids;
290 
291         dmaids = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
292         if (!dmaids)
293                 return -ENODEV; /* whoa, has ordering changed? */
294 
295         pcd->ddma_id = dmaids[stype];
296 
297         snd_soc_set_runtime_hwparams(substream, &au1xpsc_pcm_hardware);
298         return 0;
299 }
300 
301 static int au1xpsc_pcm_close(struct snd_pcm_substream *substream)
302 {
303         au1x_pcm_dbdma_free(to_dmadata(substream));
304         return 0;
305 }
306 
307 static struct snd_pcm_ops au1xpsc_pcm_ops = {
308         .open           = au1xpsc_pcm_open,
309         .close          = au1xpsc_pcm_close,
310         .ioctl          = snd_pcm_lib_ioctl,
311         .hw_params      = au1xpsc_pcm_hw_params,
312         .hw_free        = au1xpsc_pcm_hw_free,
313         .prepare        = au1xpsc_pcm_prepare,
314         .trigger        = au1xpsc_pcm_trigger,
315         .pointer        = au1xpsc_pcm_pointer,
316 };
317 
318 static void au1xpsc_pcm_free_dma_buffers(struct snd_pcm *pcm)
319 {
320         snd_pcm_lib_preallocate_free_for_all(pcm);
321 }
322 
323 static int au1xpsc_pcm_new(struct snd_soc_pcm_runtime *rtd)
324 {
325         struct snd_card *card = rtd->card->snd_card;
326         struct snd_pcm *pcm = rtd->pcm;
327 
328         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
329                 card->dev, AU1XPSC_BUFFER_MIN_BYTES, (4096 * 1024) - 1);
330 
331         return 0;
332 }
333 
334 /* au1xpsc audio platform */
335 static struct snd_soc_platform_driver au1xpsc_soc_platform = {
336         .ops            = &au1xpsc_pcm_ops,
337         .pcm_new        = au1xpsc_pcm_new,
338         .pcm_free       = au1xpsc_pcm_free_dma_buffers,
339 };
340 
341 static int au1xpsc_pcm_drvprobe(struct platform_device *pdev)
342 {
343         struct au1xpsc_audio_dmadata *dmadata;
344 
345         dmadata = devm_kzalloc(&pdev->dev,
346                                2 * sizeof(struct au1xpsc_audio_dmadata),
347                                GFP_KERNEL);
348         if (!dmadata)
349                 return -ENOMEM;
350 
351         platform_set_drvdata(pdev, dmadata);
352 
353         return snd_soc_register_platform(&pdev->dev, &au1xpsc_soc_platform);
354 }
355 
356 static int au1xpsc_pcm_drvremove(struct platform_device *pdev)
357 {
358         snd_soc_unregister_platform(&pdev->dev);
359 
360         return 0;
361 }
362 
363 static struct platform_driver au1xpsc_pcm_driver = {
364         .driver = {
365                 .name   = "au1xpsc-pcm",
366                 .owner  = THIS_MODULE,
367         },
368         .probe          = au1xpsc_pcm_drvprobe,
369         .remove         = au1xpsc_pcm_drvremove,
370 };
371 
372 module_platform_driver(au1xpsc_pcm_driver);
373 
374 MODULE_LICENSE("GPL");
375 MODULE_DESCRIPTION("Au12x0/Au1550 PSC Audio DMA driver");
376 MODULE_AUTHOR("Manuel Lauss");
377 

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