2 * Au1000/Au1500/Au1100 Audio DMA support.
4 * (c) 2011 Manuel Lauss <manuel.lauss@googlemail.com>
6 * copied almost verbatim from the old ALSA driver, written by
7 * Charles Eidsness <charles@cooper-street.com>
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/platform_device.h>
13 #include <linux/slab.h>
14 #include <linux/dma-mapping.h>
15 #include <sound/core.h>
16 #include <sound/pcm.h>
17 #include <sound/pcm_params.h>
18 #include <sound/soc.h>
19 #include <asm/mach-au1x00/au1000.h>
20 #include <asm/mach-au1x00/au1000_dma.h>
24 #define ALCHEMY_PCM_FMTS \
25 (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 | \
26 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | \
27 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE | \
28 SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE | \
29 SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_U32_BE | \
34 u32 relative_end; /* relative to start of buffer */
35 struct pcm_period *next;
39 struct snd_pcm_substream *substream;
41 struct pcm_period *buffer;
42 unsigned int period_size;
46 struct alchemy_pcm_ctx {
47 struct audio_stream stream[2]; /* playback & capture */
50 static void au1000_release_dma_link(struct audio_stream *stream)
52 struct pcm_period *pointer;
53 struct pcm_period *pointer_next;
55 stream->period_size = 0;
57 pointer = stream->buffer;
61 pointer_next = pointer->next;
63 pointer = pointer_next;
64 } while (pointer != stream->buffer);
65 stream->buffer = NULL;
68 static int au1000_setup_dma_link(struct audio_stream *stream,
69 unsigned int period_bytes,
72 struct snd_pcm_substream *substream = stream->substream;
73 struct snd_pcm_runtime *runtime = substream->runtime;
74 struct pcm_period *pointer;
75 unsigned long dma_start;
78 dma_start = virt_to_phys(runtime->dma_area);
80 if (stream->period_size == period_bytes &&
81 stream->periods == periods)
82 return 0; /* not changed */
84 au1000_release_dma_link(stream);
86 stream->period_size = period_bytes;
87 stream->periods = periods;
89 stream->buffer = kmalloc(sizeof(struct pcm_period), GFP_KERNEL);
92 pointer = stream->buffer;
93 for (i = 0; i < periods; i++) {
94 pointer->start = (u32)(dma_start + (i * period_bytes));
95 pointer->relative_end = (u32) (((i+1) * period_bytes) - 0x1);
96 if (i < periods - 1) {
97 pointer->next = kmalloc(sizeof(struct pcm_period),
100 au1000_release_dma_link(stream);
103 pointer = pointer->next;
106 pointer->next = stream->buffer;
110 static void au1000_dma_stop(struct audio_stream *stream)
113 disable_dma(stream->dma);
116 static void au1000_dma_start(struct audio_stream *stream)
121 init_dma(stream->dma);
122 if (get_dma_active_buffer(stream->dma) == 0) {
123 clear_dma_done0(stream->dma);
124 set_dma_addr0(stream->dma, stream->buffer->start);
125 set_dma_count0(stream->dma, stream->period_size >> 1);
126 set_dma_addr1(stream->dma, stream->buffer->next->start);
127 set_dma_count1(stream->dma, stream->period_size >> 1);
129 clear_dma_done1(stream->dma);
130 set_dma_addr1(stream->dma, stream->buffer->start);
131 set_dma_count1(stream->dma, stream->period_size >> 1);
132 set_dma_addr0(stream->dma, stream->buffer->next->start);
133 set_dma_count0(stream->dma, stream->period_size >> 1);
135 enable_dma_buffers(stream->dma);
136 start_dma(stream->dma);
139 static irqreturn_t au1000_dma_interrupt(int irq, void *ptr)
141 struct audio_stream *stream = (struct audio_stream *)ptr;
142 struct snd_pcm_substream *substream = stream->substream;
144 switch (get_dma_buffer_done(stream->dma)) {
146 stream->buffer = stream->buffer->next;
147 clear_dma_done0(stream->dma);
148 set_dma_addr0(stream->dma, stream->buffer->next->start);
149 set_dma_count0(stream->dma, stream->period_size >> 1);
150 enable_dma_buffer0(stream->dma);
153 stream->buffer = stream->buffer->next;
154 clear_dma_done1(stream->dma);
155 set_dma_addr1(stream->dma, stream->buffer->next->start);
156 set_dma_count1(stream->dma, stream->period_size >> 1);
157 enable_dma_buffer1(stream->dma);
159 case (DMA_D0 | DMA_D1):
160 pr_debug("DMA %d missed interrupt.\n", stream->dma);
161 au1000_dma_stop(stream);
162 au1000_dma_start(stream);
164 case (~DMA_D0 & ~DMA_D1):
165 pr_debug("DMA %d empty irq.\n", stream->dma);
167 snd_pcm_period_elapsed(substream);
171 static const struct snd_pcm_hardware alchemy_pcm_hardware = {
172 .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
173 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BATCH,
174 .formats = ALCHEMY_PCM_FMTS,
175 .rates = SNDRV_PCM_RATE_8000_192000,
176 .rate_min = SNDRV_PCM_RATE_8000,
177 .rate_max = SNDRV_PCM_RATE_192000,
180 .period_bytes_min = 1024,
181 .period_bytes_max = 16 * 1024 - 1,
184 .buffer_bytes_max = 128 * 1024,
188 static inline struct alchemy_pcm_ctx *ss_to_ctx(struct snd_pcm_substream *ss)
190 struct snd_soc_pcm_runtime *rtd = ss->private_data;
191 return snd_soc_platform_get_drvdata(rtd->platform);
194 static inline struct audio_stream *ss_to_as(struct snd_pcm_substream *ss)
196 struct alchemy_pcm_ctx *ctx = ss_to_ctx(ss);
197 return &(ctx->stream[ss->stream]);
200 static int alchemy_pcm_open(struct snd_pcm_substream *substream)
202 struct alchemy_pcm_ctx *ctx = ss_to_ctx(substream);
203 struct snd_soc_pcm_runtime *rtd = substream->private_data;
204 int *dmaids, s = substream->stream;
207 dmaids = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
209 return -ENODEV; /* whoa, has ordering changed? */
212 name = (s == SNDRV_PCM_STREAM_PLAYBACK) ? "audio-tx" : "audio-rx";
213 ctx->stream[s].dma = request_au1000_dma(dmaids[s], name,
214 au1000_dma_interrupt, 0,
216 set_dma_mode(ctx->stream[s].dma,
217 get_dma_mode(ctx->stream[s].dma) & ~DMA_NC);
219 ctx->stream[s].substream = substream;
220 ctx->stream[s].buffer = NULL;
221 snd_soc_set_runtime_hwparams(substream, &alchemy_pcm_hardware);
226 static int alchemy_pcm_close(struct snd_pcm_substream *substream)
228 struct alchemy_pcm_ctx *ctx = ss_to_ctx(substream);
229 int stype = substream->stream;
231 ctx->stream[stype].substream = NULL;
232 free_au1000_dma(ctx->stream[stype].dma);
237 static int alchemy_pcm_hw_params(struct snd_pcm_substream *substream,
238 struct snd_pcm_hw_params *hw_params)
240 struct audio_stream *stream = ss_to_as(substream);
243 err = snd_pcm_lib_malloc_pages(substream,
244 params_buffer_bytes(hw_params));
247 err = au1000_setup_dma_link(stream,
248 params_period_bytes(hw_params),
249 params_periods(hw_params));
251 snd_pcm_lib_free_pages(substream);
256 static int alchemy_pcm_hw_free(struct snd_pcm_substream *substream)
258 struct audio_stream *stream = ss_to_as(substream);
259 au1000_release_dma_link(stream);
260 return snd_pcm_lib_free_pages(substream);
263 static int alchemy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
265 struct audio_stream *stream = ss_to_as(substream);
269 case SNDRV_PCM_TRIGGER_START:
270 au1000_dma_start(stream);
272 case SNDRV_PCM_TRIGGER_STOP:
273 au1000_dma_stop(stream);
282 static snd_pcm_uframes_t alchemy_pcm_pointer(struct snd_pcm_substream *ss)
284 struct audio_stream *stream = ss_to_as(ss);
287 location = get_dma_residue(stream->dma);
288 location = stream->buffer->relative_end - location;
291 return bytes_to_frames(ss->runtime, location);
294 static struct snd_pcm_ops alchemy_pcm_ops = {
295 .open = alchemy_pcm_open,
296 .close = alchemy_pcm_close,
297 .ioctl = snd_pcm_lib_ioctl,
298 .hw_params = alchemy_pcm_hw_params,
299 .hw_free = alchemy_pcm_hw_free,
300 .trigger = alchemy_pcm_trigger,
301 .pointer = alchemy_pcm_pointer,
304 static void alchemy_pcm_free_dma_buffers(struct snd_pcm *pcm)
306 snd_pcm_lib_preallocate_free_for_all(pcm);
309 static int alchemy_pcm_new(struct snd_soc_pcm_runtime *rtd)
311 struct snd_pcm *pcm = rtd->pcm;
313 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
314 snd_dma_continuous_data(GFP_KERNEL), 65536, (4096 * 1024) - 1);
319 struct snd_soc_platform_driver alchemy_pcm_soc_platform = {
320 .ops = &alchemy_pcm_ops,
321 .pcm_new = alchemy_pcm_new,
322 .pcm_free = alchemy_pcm_free_dma_buffers,
325 static int __devinit alchemy_pcm_drvprobe(struct platform_device *pdev)
327 struct alchemy_pcm_ctx *ctx;
330 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
334 platform_set_drvdata(pdev, ctx);
336 ret = snd_soc_register_platform(&pdev->dev, &alchemy_pcm_soc_platform);
343 static int __devexit alchemy_pcm_drvremove(struct platform_device *pdev)
345 struct alchemy_pcm_ctx *ctx = platform_get_drvdata(pdev);
347 snd_soc_unregister_platform(&pdev->dev);
353 static struct platform_driver alchemy_pcmdma_driver = {
355 .name = "alchemy-pcm-dma",
356 .owner = THIS_MODULE,
358 .probe = alchemy_pcm_drvprobe,
359 .remove = __devexit_p(alchemy_pcm_drvremove),
362 static int __init alchemy_pcmdma_load(void)
364 return platform_driver_register(&alchemy_pcmdma_driver);
367 static void __exit alchemy_pcmdma_unload(void)
369 platform_driver_unregister(&alchemy_pcmdma_driver);
372 module_init(alchemy_pcmdma_load);
373 module_exit(alchemy_pcmdma_unload);
375 MODULE_LICENSE("GPL");
376 MODULE_DESCRIPTION("Au1000/Au1500/Au1100 Audio DMA driver");
377 MODULE_AUTHOR("Manuel Lauss");