This source file includes following definitions.
- au1000_release_dma_link
- au1000_setup_dma_link
- au1000_dma_stop
- au1000_dma_start
- au1000_dma_interrupt
- ss_to_ctx
- ss_to_as
- alchemy_pcm_open
- alchemy_pcm_close
- alchemy_pcm_hw_params
- alchemy_pcm_hw_free
- alchemy_pcm_trigger
- alchemy_pcm_pointer
- alchemy_pcm_new
- alchemy_pcm_drvprobe
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11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/platform_device.h>
14 #include <linux/slab.h>
15 #include <linux/dma-mapping.h>
16 #include <sound/core.h>
17 #include <sound/pcm.h>
18 #include <sound/pcm_params.h>
19 #include <sound/soc.h>
20 #include <asm/mach-au1x00/au1000.h>
21 #include <asm/mach-au1x00/au1000_dma.h>
22
23 #include "psc.h"
24
25 #define DRV_NAME "au1x_dma"
26
27 struct pcm_period {
28 u32 start;
29 u32 relative_end;
30 struct pcm_period *next;
31 };
32
33 struct audio_stream {
34 struct snd_pcm_substream *substream;
35 int dma;
36 struct pcm_period *buffer;
37 unsigned int period_size;
38 unsigned int periods;
39 };
40
41 struct alchemy_pcm_ctx {
42 struct audio_stream stream[2];
43 };
44
45 static void au1000_release_dma_link(struct audio_stream *stream)
46 {
47 struct pcm_period *pointer;
48 struct pcm_period *pointer_next;
49
50 stream->period_size = 0;
51 stream->periods = 0;
52 pointer = stream->buffer;
53 if (!pointer)
54 return;
55 do {
56 pointer_next = pointer->next;
57 kfree(pointer);
58 pointer = pointer_next;
59 } while (pointer != stream->buffer);
60 stream->buffer = NULL;
61 }
62
63 static int au1000_setup_dma_link(struct audio_stream *stream,
64 unsigned int period_bytes,
65 unsigned int periods)
66 {
67 struct snd_pcm_substream *substream = stream->substream;
68 struct snd_pcm_runtime *runtime = substream->runtime;
69 struct pcm_period *pointer;
70 unsigned long dma_start;
71 int i;
72
73 dma_start = virt_to_phys(runtime->dma_area);
74
75 if (stream->period_size == period_bytes &&
76 stream->periods == periods)
77 return 0;
78
79 au1000_release_dma_link(stream);
80
81 stream->period_size = period_bytes;
82 stream->periods = periods;
83
84 stream->buffer = kmalloc(sizeof(struct pcm_period), GFP_KERNEL);
85 if (!stream->buffer)
86 return -ENOMEM;
87 pointer = stream->buffer;
88 for (i = 0; i < periods; i++) {
89 pointer->start = (u32)(dma_start + (i * period_bytes));
90 pointer->relative_end = (u32) (((i+1) * period_bytes) - 0x1);
91 if (i < periods - 1) {
92 pointer->next = kmalloc(sizeof(struct pcm_period),
93 GFP_KERNEL);
94 if (!pointer->next) {
95 au1000_release_dma_link(stream);
96 return -ENOMEM;
97 }
98 pointer = pointer->next;
99 }
100 }
101 pointer->next = stream->buffer;
102 return 0;
103 }
104
105 static void au1000_dma_stop(struct audio_stream *stream)
106 {
107 if (stream->buffer)
108 disable_dma(stream->dma);
109 }
110
111 static void au1000_dma_start(struct audio_stream *stream)
112 {
113 if (!stream->buffer)
114 return;
115
116 init_dma(stream->dma);
117 if (get_dma_active_buffer(stream->dma) == 0) {
118 clear_dma_done0(stream->dma);
119 set_dma_addr0(stream->dma, stream->buffer->start);
120 set_dma_count0(stream->dma, stream->period_size >> 1);
121 set_dma_addr1(stream->dma, stream->buffer->next->start);
122 set_dma_count1(stream->dma, stream->period_size >> 1);
123 } else {
124 clear_dma_done1(stream->dma);
125 set_dma_addr1(stream->dma, stream->buffer->start);
126 set_dma_count1(stream->dma, stream->period_size >> 1);
127 set_dma_addr0(stream->dma, stream->buffer->next->start);
128 set_dma_count0(stream->dma, stream->period_size >> 1);
129 }
130 enable_dma_buffers(stream->dma);
131 start_dma(stream->dma);
132 }
133
134 static irqreturn_t au1000_dma_interrupt(int irq, void *ptr)
135 {
136 struct audio_stream *stream = (struct audio_stream *)ptr;
137 struct snd_pcm_substream *substream = stream->substream;
138
139 switch (get_dma_buffer_done(stream->dma)) {
140 case DMA_D0:
141 stream->buffer = stream->buffer->next;
142 clear_dma_done0(stream->dma);
143 set_dma_addr0(stream->dma, stream->buffer->next->start);
144 set_dma_count0(stream->dma, stream->period_size >> 1);
145 enable_dma_buffer0(stream->dma);
146 break;
147 case DMA_D1:
148 stream->buffer = stream->buffer->next;
149 clear_dma_done1(stream->dma);
150 set_dma_addr1(stream->dma, stream->buffer->next->start);
151 set_dma_count1(stream->dma, stream->period_size >> 1);
152 enable_dma_buffer1(stream->dma);
153 break;
154 case (DMA_D0 | DMA_D1):
155 pr_debug("DMA %d missed interrupt.\n", stream->dma);
156 au1000_dma_stop(stream);
157 au1000_dma_start(stream);
158 break;
159 case (~DMA_D0 & ~DMA_D1):
160 pr_debug("DMA %d empty irq.\n", stream->dma);
161 }
162 snd_pcm_period_elapsed(substream);
163 return IRQ_HANDLED;
164 }
165
166 static const struct snd_pcm_hardware alchemy_pcm_hardware = {
167 .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
168 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BATCH,
169 .period_bytes_min = 1024,
170 .period_bytes_max = 16 * 1024 - 1,
171 .periods_min = 4,
172 .periods_max = 255,
173 .buffer_bytes_max = 128 * 1024,
174 .fifo_size = 16,
175 };
176
177 static inline struct alchemy_pcm_ctx *ss_to_ctx(struct snd_pcm_substream *ss)
178 {
179 struct snd_soc_pcm_runtime *rtd = ss->private_data;
180 struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
181 return snd_soc_component_get_drvdata(component);
182 }
183
184 static inline struct audio_stream *ss_to_as(struct snd_pcm_substream *ss)
185 {
186 struct alchemy_pcm_ctx *ctx = ss_to_ctx(ss);
187 return &(ctx->stream[ss->stream]);
188 }
189
190 static int alchemy_pcm_open(struct snd_pcm_substream *substream)
191 {
192 struct alchemy_pcm_ctx *ctx = ss_to_ctx(substream);
193 struct snd_soc_pcm_runtime *rtd = substream->private_data;
194 int *dmaids, s = substream->stream;
195 char *name;
196
197 dmaids = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
198 if (!dmaids)
199 return -ENODEV;
200
201
202 name = (s == SNDRV_PCM_STREAM_PLAYBACK) ? "audio-tx" : "audio-rx";
203 ctx->stream[s].dma = request_au1000_dma(dmaids[s], name,
204 au1000_dma_interrupt, 0,
205 &ctx->stream[s]);
206 set_dma_mode(ctx->stream[s].dma,
207 get_dma_mode(ctx->stream[s].dma) & ~DMA_NC);
208
209 ctx->stream[s].substream = substream;
210 ctx->stream[s].buffer = NULL;
211 snd_soc_set_runtime_hwparams(substream, &alchemy_pcm_hardware);
212
213 return 0;
214 }
215
216 static int alchemy_pcm_close(struct snd_pcm_substream *substream)
217 {
218 struct alchemy_pcm_ctx *ctx = ss_to_ctx(substream);
219 int stype = substream->stream;
220
221 ctx->stream[stype].substream = NULL;
222 free_au1000_dma(ctx->stream[stype].dma);
223
224 return 0;
225 }
226
227 static int alchemy_pcm_hw_params(struct snd_pcm_substream *substream,
228 struct snd_pcm_hw_params *hw_params)
229 {
230 struct audio_stream *stream = ss_to_as(substream);
231 int err;
232
233 err = snd_pcm_lib_malloc_pages(substream,
234 params_buffer_bytes(hw_params));
235 if (err < 0)
236 return err;
237 err = au1000_setup_dma_link(stream,
238 params_period_bytes(hw_params),
239 params_periods(hw_params));
240 if (err)
241 snd_pcm_lib_free_pages(substream);
242
243 return err;
244 }
245
246 static int alchemy_pcm_hw_free(struct snd_pcm_substream *substream)
247 {
248 struct audio_stream *stream = ss_to_as(substream);
249 au1000_release_dma_link(stream);
250 return snd_pcm_lib_free_pages(substream);
251 }
252
253 static int alchemy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
254 {
255 struct audio_stream *stream = ss_to_as(substream);
256 int err = 0;
257
258 switch (cmd) {
259 case SNDRV_PCM_TRIGGER_START:
260 au1000_dma_start(stream);
261 break;
262 case SNDRV_PCM_TRIGGER_STOP:
263 au1000_dma_stop(stream);
264 break;
265 default:
266 err = -EINVAL;
267 break;
268 }
269 return err;
270 }
271
272 static snd_pcm_uframes_t alchemy_pcm_pointer(struct snd_pcm_substream *ss)
273 {
274 struct audio_stream *stream = ss_to_as(ss);
275 long location;
276
277 location = get_dma_residue(stream->dma);
278 location = stream->buffer->relative_end - location;
279 if (location == -1)
280 location = 0;
281 return bytes_to_frames(ss->runtime, location);
282 }
283
284 static const struct snd_pcm_ops alchemy_pcm_ops = {
285 .open = alchemy_pcm_open,
286 .close = alchemy_pcm_close,
287 .ioctl = snd_pcm_lib_ioctl,
288 .hw_params = alchemy_pcm_hw_params,
289 .hw_free = alchemy_pcm_hw_free,
290 .trigger = alchemy_pcm_trigger,
291 .pointer = alchemy_pcm_pointer,
292 };
293
294 static int alchemy_pcm_new(struct snd_soc_pcm_runtime *rtd)
295 {
296 struct snd_pcm *pcm = rtd->pcm;
297
298 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
299 snd_dma_continuous_data(GFP_KERNEL), 65536, (4096 * 1024) - 1);
300
301 return 0;
302 }
303
304 static struct snd_soc_component_driver alchemy_pcm_soc_component = {
305 .name = DRV_NAME,
306 .ops = &alchemy_pcm_ops,
307 .pcm_new = alchemy_pcm_new,
308 };
309
310 static int alchemy_pcm_drvprobe(struct platform_device *pdev)
311 {
312 struct alchemy_pcm_ctx *ctx;
313
314 ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
315 if (!ctx)
316 return -ENOMEM;
317
318 platform_set_drvdata(pdev, ctx);
319
320 return devm_snd_soc_register_component(&pdev->dev,
321 &alchemy_pcm_soc_component, NULL, 0);
322 }
323
324 static struct platform_driver alchemy_pcmdma_driver = {
325 .driver = {
326 .name = "alchemy-pcm-dma",
327 },
328 .probe = alchemy_pcm_drvprobe,
329 };
330
331 module_platform_driver(alchemy_pcmdma_driver);
332
333 MODULE_LICENSE("GPL");
334 MODULE_DESCRIPTION("Au1000/Au1500/Au1100 Audio DMA driver");
335 MODULE_AUTHOR("Manuel Lauss");