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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>
21
22#include "psc.h"
23
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 | \
30 0)
31
32struct pcm_period {
33 u32 start;
34 u32 relative_end;
35 struct pcm_period *next;
36};
37
38struct audio_stream {
39 struct snd_pcm_substream *substream;
40 int dma;
41 struct pcm_period *buffer;
42 unsigned int period_size;
43 unsigned int periods;
44};
45
46struct alchemy_pcm_ctx {
47 struct audio_stream stream[2];
48};
49
50static void au1000_release_dma_link(struct audio_stream *stream)
51{
52 struct pcm_period *pointer;
53 struct pcm_period *pointer_next;
54
55 stream->period_size = 0;
56 stream->periods = 0;
57 pointer = stream->buffer;
58 if (!pointer)
59 return;
60 do {
61 pointer_next = pointer->next;
62 kfree(pointer);
63 pointer = pointer_next;
64 } while (pointer != stream->buffer);
65 stream->buffer = NULL;
66}
67
68static int au1000_setup_dma_link(struct audio_stream *stream,
69 unsigned int period_bytes,
70 unsigned int periods)
71{
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;
76 int i;
77
78 dma_start = virt_to_phys(runtime->dma_area);
79
80 if (stream->period_size == period_bytes &&
81 stream->periods == periods)
82 return 0;
83
84 au1000_release_dma_link(stream);
85
86 stream->period_size = period_bytes;
87 stream->periods = periods;
88
89 stream->buffer = kmalloc(sizeof(struct pcm_period), GFP_KERNEL);
90 if (!stream->buffer)
91 return -ENOMEM;
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),
98 GFP_KERNEL);
99 if (!pointer->next) {
100 au1000_release_dma_link(stream);
101 return -ENOMEM;
102 }
103 pointer = pointer->next;
104 }
105 }
106 pointer->next = stream->buffer;
107 return 0;
108}
109
110static void au1000_dma_stop(struct audio_stream *stream)
111{
112 if (stream->buffer)
113 disable_dma(stream->dma);
114}
115
116static void au1000_dma_start(struct audio_stream *stream)
117{
118 if (!stream->buffer)
119 return;
120
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);
128 } else {
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);
134 }
135 enable_dma_buffers(stream->dma);
136 start_dma(stream->dma);
137}
138
139static irqreturn_t au1000_dma_interrupt(int irq, void *ptr)
140{
141 struct audio_stream *stream = (struct audio_stream *)ptr;
142 struct snd_pcm_substream *substream = stream->substream;
143
144 switch (get_dma_buffer_done(stream->dma)) {
145 case DMA_D0:
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);
151 break;
152 case DMA_D1:
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);
158 break;
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);
163 break;
164 case (~DMA_D0 & ~DMA_D1):
165 pr_debug("DMA %d empty irq.\n", stream->dma);
166 }
167 snd_pcm_period_elapsed(substream);
168 return IRQ_HANDLED;
169}
170
171static 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,
178 .channels_min = 2,
179 .channels_max = 2,
180 .period_bytes_min = 1024,
181 .period_bytes_max = 16 * 1024 - 1,
182 .periods_min = 4,
183 .periods_max = 255,
184 .buffer_bytes_max = 128 * 1024,
185 .fifo_size = 16,
186};
187
188static inline struct alchemy_pcm_ctx *ss_to_ctx(struct snd_pcm_substream *ss)
189{
190 struct snd_soc_pcm_runtime *rtd = ss->private_data;
191 return snd_soc_platform_get_drvdata(rtd->platform);
192}
193
194static inline struct audio_stream *ss_to_as(struct snd_pcm_substream *ss)
195{
196 struct alchemy_pcm_ctx *ctx = ss_to_ctx(ss);
197 return &(ctx->stream[ss->stream]);
198}
199
200static int alchemy_pcm_open(struct snd_pcm_substream *substream)
201{
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;
205 char *name;
206
207 dmaids = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
208 if (!dmaids)
209 return -ENODEV;
210
211
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,
215 &ctx->stream[s]);
216 set_dma_mode(ctx->stream[s].dma,
217 get_dma_mode(ctx->stream[s].dma) & ~DMA_NC);
218
219 ctx->stream[s].substream = substream;
220 ctx->stream[s].buffer = NULL;
221 snd_soc_set_runtime_hwparams(substream, &alchemy_pcm_hardware);
222
223 return 0;
224}
225
226static int alchemy_pcm_close(struct snd_pcm_substream *substream)
227{
228 struct alchemy_pcm_ctx *ctx = ss_to_ctx(substream);
229 int stype = substream->stream;
230
231 ctx->stream[stype].substream = NULL;
232 free_au1000_dma(ctx->stream[stype].dma);
233
234 return 0;
235}
236
237static int alchemy_pcm_hw_params(struct snd_pcm_substream *substream,
238 struct snd_pcm_hw_params *hw_params)
239{
240 struct audio_stream *stream = ss_to_as(substream);
241 int err;
242
243 err = snd_pcm_lib_malloc_pages(substream,
244 params_buffer_bytes(hw_params));
245 if (err < 0)
246 return err;
247 err = au1000_setup_dma_link(stream,
248 params_period_bytes(hw_params),
249 params_periods(hw_params));
250 if (err)
251 snd_pcm_lib_free_pages(substream);
252
253 return err;
254}
255
256static int alchemy_pcm_hw_free(struct snd_pcm_substream *substream)
257{
258 struct audio_stream *stream = ss_to_as(substream);
259 au1000_release_dma_link(stream);
260 return snd_pcm_lib_free_pages(substream);
261}
262
263static int alchemy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
264{
265 struct audio_stream *stream = ss_to_as(substream);
266 int err = 0;
267
268 switch (cmd) {
269 case SNDRV_PCM_TRIGGER_START:
270 au1000_dma_start(stream);
271 break;
272 case SNDRV_PCM_TRIGGER_STOP:
273 au1000_dma_stop(stream);
274 break;
275 default:
276 err = -EINVAL;
277 break;
278 }
279 return err;
280}
281
282static snd_pcm_uframes_t alchemy_pcm_pointer(struct snd_pcm_substream *ss)
283{
284 struct audio_stream *stream = ss_to_as(ss);
285 long location;
286
287 location = get_dma_residue(stream->dma);
288 location = stream->buffer->relative_end - location;
289 if (location == -1)
290 location = 0;
291 return bytes_to_frames(ss->runtime, location);
292}
293
294static 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,
302};
303
304static void alchemy_pcm_free_dma_buffers(struct snd_pcm *pcm)
305{
306 snd_pcm_lib_preallocate_free_for_all(pcm);
307}
308
309static int alchemy_pcm_new(struct snd_soc_pcm_runtime *rtd)
310{
311 struct snd_pcm *pcm = rtd->pcm;
312
313 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
314 snd_dma_continuous_data(GFP_KERNEL), 65536, (4096 * 1024) - 1);
315
316 return 0;
317}
318
319static 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,
323};
324
325static int alchemy_pcm_drvprobe(struct platform_device *pdev)
326{
327 struct alchemy_pcm_ctx *ctx;
328
329 ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
330 if (!ctx)
331 return -ENOMEM;
332
333 platform_set_drvdata(pdev, ctx);
334
335 return snd_soc_register_platform(&pdev->dev, &alchemy_pcm_soc_platform);
336}
337
338static int alchemy_pcm_drvremove(struct platform_device *pdev)
339{
340 snd_soc_unregister_platform(&pdev->dev);
341
342 return 0;
343}
344
345static struct platform_driver alchemy_pcmdma_driver = {
346 .driver = {
347 .name = "alchemy-pcm-dma",
348 .owner = THIS_MODULE,
349 },
350 .probe = alchemy_pcm_drvprobe,
351 .remove = alchemy_pcm_drvremove,
352};
353
354module_platform_driver(alchemy_pcmdma_driver);
355
356MODULE_LICENSE("GPL");
357MODULE_DESCRIPTION("Au1000/Au1500/Au1100 Audio DMA driver");
358MODULE_AUTHOR("Manuel Lauss");
359
