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