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Commit | Line | Data |
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4a161d23 ML |
1 | /* |
2 | * Au12x0/Au1550 PSC ALSA ASoC audio support. | |
3 | * | |
4 | * (c) 2007-2008 MSC Vertriebsges.m.b.H., | |
0f83d639 | 5 | * Manuel Lauss <manuel.lauss@gmail.com> |
4a161d23 ML |
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 | * NOTE: all of these drivers can only work with a SINGLE instance | |
14 | * of a PSC. Multiple independent audio devices are impossible | |
15 | * with ASoC v1. | |
16 | */ | |
17 | ||
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/dma-mapping.h> | |
24 | ||
25 | #include <sound/core.h> | |
26 | #include <sound/pcm.h> | |
27 | #include <sound/pcm_params.h> | |
28 | #include <sound/soc.h> | |
29 | ||
30 | #include <asm/mach-au1x00/au1000.h> | |
31 | #include <asm/mach-au1x00/au1xxx_dbdma.h> | |
32 | #include <asm/mach-au1x00/au1xxx_psc.h> | |
33 | ||
34 | #include "psc.h" | |
35 | ||
36 | /*#define PCM_DEBUG*/ | |
37 | ||
38 | #define MSG(x...) printk(KERN_INFO "au1xpsc_pcm: " x) | |
39 | #ifdef PCM_DEBUG | |
40 | #define DBG MSG | |
41 | #else | |
42 | #define DBG(x...) do {} while (0) | |
43 | #endif | |
44 | ||
45 | struct au1xpsc_audio_dmadata { | |
46 | /* DDMA control data */ | |
47 | unsigned int ddma_id; /* DDMA direction ID for this PSC */ | |
48 | u32 ddma_chan; /* DDMA context */ | |
49 | ||
50 | /* PCM context (for irq handlers) */ | |
51 | struct snd_pcm_substream *substream; | |
52 | unsigned long curr_period; /* current segment DDMA is working on */ | |
53 | unsigned long q_period; /* queue period(s) */ | |
963accbc ML |
54 | dma_addr_t dma_area; /* address of queued DMA area */ |
55 | dma_addr_t dma_area_s; /* start address of DMA area */ | |
4a161d23 ML |
56 | unsigned long pos; /* current byte position being played */ |
57 | unsigned long periods; /* number of SG segments in total */ | |
58 | unsigned long period_bytes; /* size in bytes of one SG segment */ | |
59 | ||
60 | /* runtime data */ | |
61 | int msbits; | |
62 | }; | |
63 | ||
64 | /* instance data. There can be only one, MacLeod!!!! */ | |
65 | static struct au1xpsc_audio_dmadata *au1xpsc_audio_pcmdma[2]; | |
66 | ||
67 | /* | |
68 | * These settings are somewhat okay, at least on my machine audio plays | |
69 | * almost skip-free. Especially the 64kB buffer seems to help a LOT. | |
70 | */ | |
71 | #define AU1XPSC_PERIOD_MIN_BYTES 1024 | |
72 | #define AU1XPSC_BUFFER_MIN_BYTES 65536 | |
73 | ||
74 | #define AU1XPSC_PCM_FMTS \ | |
75 | (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 | \ | |
76 | SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | \ | |
77 | SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE | \ | |
78 | SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE | \ | |
79 | SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_U32_BE | \ | |
80 | 0) | |
81 | ||
82 | /* PCM hardware DMA capabilities - platform specific */ | |
83 | static const struct snd_pcm_hardware au1xpsc_pcm_hardware = { | |
84 | .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | | |
2008f137 | 85 | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BATCH, |
4a161d23 ML |
86 | .formats = AU1XPSC_PCM_FMTS, |
87 | .period_bytes_min = AU1XPSC_PERIOD_MIN_BYTES, | |
88 | .period_bytes_max = 4096 * 1024 - 1, | |
89 | .periods_min = 2, | |
90 | .periods_max = 4096, /* 2 to as-much-as-you-like */ | |
91 | .buffer_bytes_max = 4096 * 1024 - 1, | |
92 | .fifo_size = 16, /* fifo entries of AC97/I2S PSC */ | |
93 | }; | |
94 | ||
95 | static void au1x_pcm_queue_tx(struct au1xpsc_audio_dmadata *cd) | |
96 | { | |
963accbc | 97 | au1xxx_dbdma_put_source(cd->ddma_chan, cd->dma_area, |
4a161d23 ML |
98 | cd->period_bytes, DDMA_FLAGS_IE); |
99 | ||
100 | /* update next-to-queue period */ | |
101 | ++cd->q_period; | |
102 | cd->dma_area += cd->period_bytes; | |
103 | if (cd->q_period >= cd->periods) { | |
104 | cd->q_period = 0; | |
105 | cd->dma_area = cd->dma_area_s; | |
106 | } | |
107 | } | |
108 | ||
109 | static void au1x_pcm_queue_rx(struct au1xpsc_audio_dmadata *cd) | |
110 | { | |
963accbc | 111 | au1xxx_dbdma_put_dest(cd->ddma_chan, cd->dma_area, |
ea071cc7 | 112 | cd->period_bytes, DDMA_FLAGS_IE); |
4a161d23 ML |
113 | |
114 | /* update next-to-queue period */ | |
115 | ++cd->q_period; | |
116 | cd->dma_area += cd->period_bytes; | |
117 | if (cd->q_period >= cd->periods) { | |
118 | cd->q_period = 0; | |
119 | cd->dma_area = cd->dma_area_s; | |
120 | } | |
121 | } | |
122 | ||
123 | static void au1x_pcm_dmatx_cb(int irq, void *dev_id) | |
124 | { | |
125 | struct au1xpsc_audio_dmadata *cd = dev_id; | |
126 | ||
127 | cd->pos += cd->period_bytes; | |
128 | if (++cd->curr_period >= cd->periods) { | |
129 | cd->pos = 0; | |
130 | cd->curr_period = 0; | |
131 | } | |
132 | snd_pcm_period_elapsed(cd->substream); | |
133 | au1x_pcm_queue_tx(cd); | |
134 | } | |
135 | ||
136 | static void au1x_pcm_dmarx_cb(int irq, void *dev_id) | |
137 | { | |
138 | struct au1xpsc_audio_dmadata *cd = dev_id; | |
139 | ||
140 | cd->pos += cd->period_bytes; | |
141 | if (++cd->curr_period >= cd->periods) { | |
142 | cd->pos = 0; | |
143 | cd->curr_period = 0; | |
144 | } | |
145 | snd_pcm_period_elapsed(cd->substream); | |
146 | au1x_pcm_queue_rx(cd); | |
147 | } | |
148 | ||
149 | static void au1x_pcm_dbdma_free(struct au1xpsc_audio_dmadata *pcd) | |
150 | { | |
151 | if (pcd->ddma_chan) { | |
152 | au1xxx_dbdma_stop(pcd->ddma_chan); | |
153 | au1xxx_dbdma_reset(pcd->ddma_chan); | |
154 | au1xxx_dbdma_chan_free(pcd->ddma_chan); | |
155 | pcd->ddma_chan = 0; | |
156 | pcd->msbits = 0; | |
157 | } | |
158 | } | |
159 | ||
160 | /* in case of missing DMA ring or changed TX-source / RX-dest bit widths, | |
161 | * allocate (or reallocate) a 2-descriptor DMA ring with bit depth according | |
162 | * to ALSA-supplied sample depth. This is due to limitations in the dbdma api | |
163 | * (cannot adjust source/dest widths of already allocated descriptor ring). | |
164 | */ | |
165 | static int au1x_pcm_dbdma_realloc(struct au1xpsc_audio_dmadata *pcd, | |
166 | int stype, int msbits) | |
167 | { | |
168 | /* DMA only in 8/16/32 bit widths */ | |
169 | if (msbits == 24) | |
170 | msbits = 32; | |
171 | ||
172 | /* check current config: correct bits and descriptors allocated? */ | |
173 | if ((pcd->ddma_chan) && (msbits == pcd->msbits)) | |
174 | goto out; /* all ok! */ | |
175 | ||
176 | au1x_pcm_dbdma_free(pcd); | |
177 | ||
178 | if (stype == PCM_RX) | |
179 | pcd->ddma_chan = au1xxx_dbdma_chan_alloc(pcd->ddma_id, | |
180 | DSCR_CMD0_ALWAYS, | |
181 | au1x_pcm_dmarx_cb, (void *)pcd); | |
182 | else | |
183 | pcd->ddma_chan = au1xxx_dbdma_chan_alloc(DSCR_CMD0_ALWAYS, | |
184 | pcd->ddma_id, | |
185 | au1x_pcm_dmatx_cb, (void *)pcd); | |
186 | ||
187 | if (!pcd->ddma_chan) | |
c19a28e1 | 188 | return -ENOMEM; |
4a161d23 ML |
189 | |
190 | au1xxx_dbdma_set_devwidth(pcd->ddma_chan, msbits); | |
191 | au1xxx_dbdma_ring_alloc(pcd->ddma_chan, 2); | |
192 | ||
193 | pcd->msbits = msbits; | |
194 | ||
195 | au1xxx_dbdma_stop(pcd->ddma_chan); | |
196 | au1xxx_dbdma_reset(pcd->ddma_chan); | |
197 | ||
198 | out: | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static int au1xpsc_pcm_hw_params(struct snd_pcm_substream *substream, | |
203 | struct snd_pcm_hw_params *params) | |
204 | { | |
205 | struct snd_pcm_runtime *runtime = substream->runtime; | |
206 | struct au1xpsc_audio_dmadata *pcd; | |
207 | int stype, ret; | |
208 | ||
209 | ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params)); | |
210 | if (ret < 0) | |
211 | goto out; | |
212 | ||
213 | stype = SUBSTREAM_TYPE(substream); | |
214 | pcd = au1xpsc_audio_pcmdma[stype]; | |
215 | ||
216 | DBG("runtime->dma_area = 0x%08lx dma_addr_t = 0x%08lx dma_size = %d " | |
217 | "runtime->min_align %d\n", | |
218 | (unsigned long)runtime->dma_area, | |
219 | (unsigned long)runtime->dma_addr, runtime->dma_bytes, | |
220 | runtime->min_align); | |
221 | ||
222 | DBG("bits %d frags %d frag_bytes %d is_rx %d\n", params->msbits, | |
223 | params_periods(params), params_period_bytes(params), stype); | |
224 | ||
225 | ret = au1x_pcm_dbdma_realloc(pcd, stype, params->msbits); | |
226 | if (ret) { | |
227 | MSG("DDMA channel (re)alloc failed!\n"); | |
228 | goto out; | |
229 | } | |
230 | ||
231 | pcd->substream = substream; | |
232 | pcd->period_bytes = params_period_bytes(params); | |
233 | pcd->periods = params_periods(params); | |
963accbc | 234 | pcd->dma_area_s = pcd->dma_area = runtime->dma_addr; |
4a161d23 ML |
235 | pcd->q_period = 0; |
236 | pcd->curr_period = 0; | |
237 | pcd->pos = 0; | |
238 | ||
239 | ret = 0; | |
240 | out: | |
241 | return ret; | |
242 | } | |
243 | ||
244 | static int au1xpsc_pcm_hw_free(struct snd_pcm_substream *substream) | |
245 | { | |
246 | snd_pcm_lib_free_pages(substream); | |
247 | return 0; | |
248 | } | |
249 | ||
250 | static int au1xpsc_pcm_prepare(struct snd_pcm_substream *substream) | |
251 | { | |
252 | struct au1xpsc_audio_dmadata *pcd = | |
253 | au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]; | |
254 | ||
255 | au1xxx_dbdma_reset(pcd->ddma_chan); | |
256 | ||
257 | if (SUBSTREAM_TYPE(substream) == PCM_RX) { | |
258 | au1x_pcm_queue_rx(pcd); | |
259 | au1x_pcm_queue_rx(pcd); | |
260 | } else { | |
261 | au1x_pcm_queue_tx(pcd); | |
262 | au1x_pcm_queue_tx(pcd); | |
263 | } | |
264 | ||
265 | return 0; | |
266 | } | |
267 | ||
268 | static int au1xpsc_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
269 | { | |
270 | u32 c = au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]->ddma_chan; | |
271 | ||
272 | switch (cmd) { | |
273 | case SNDRV_PCM_TRIGGER_START: | |
274 | case SNDRV_PCM_TRIGGER_RESUME: | |
275 | au1xxx_dbdma_start(c); | |
276 | break; | |
277 | case SNDRV_PCM_TRIGGER_STOP: | |
278 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
279 | au1xxx_dbdma_stop(c); | |
280 | break; | |
281 | default: | |
282 | return -EINVAL; | |
283 | } | |
284 | return 0; | |
285 | } | |
286 | ||
287 | static snd_pcm_uframes_t | |
288 | au1xpsc_pcm_pointer(struct snd_pcm_substream *substream) | |
289 | { | |
290 | return bytes_to_frames(substream->runtime, | |
291 | au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]->pos); | |
292 | } | |
293 | ||
294 | static int au1xpsc_pcm_open(struct snd_pcm_substream *substream) | |
295 | { | |
296 | snd_soc_set_runtime_hwparams(substream, &au1xpsc_pcm_hardware); | |
297 | return 0; | |
298 | } | |
299 | ||
300 | static int au1xpsc_pcm_close(struct snd_pcm_substream *substream) | |
301 | { | |
302 | au1x_pcm_dbdma_free(au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]); | |
303 | return 0; | |
304 | } | |
305 | ||
b2a19d02 | 306 | static struct snd_pcm_ops au1xpsc_pcm_ops = { |
4a161d23 ML |
307 | .open = au1xpsc_pcm_open, |
308 | .close = au1xpsc_pcm_close, | |
309 | .ioctl = snd_pcm_lib_ioctl, | |
310 | .hw_params = au1xpsc_pcm_hw_params, | |
311 | .hw_free = au1xpsc_pcm_hw_free, | |
312 | .prepare = au1xpsc_pcm_prepare, | |
313 | .trigger = au1xpsc_pcm_trigger, | |
314 | .pointer = au1xpsc_pcm_pointer, | |
315 | }; | |
316 | ||
317 | static void au1xpsc_pcm_free_dma_buffers(struct snd_pcm *pcm) | |
318 | { | |
319 | snd_pcm_lib_preallocate_free_for_all(pcm); | |
320 | } | |
321 | ||
322 | static int au1xpsc_pcm_new(struct snd_card *card, | |
323 | struct snd_soc_dai *dai, | |
324 | struct snd_pcm *pcm) | |
325 | { | |
326 | snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, | |
327 | card->dev, AU1XPSC_BUFFER_MIN_BYTES, (4096 * 1024) - 1); | |
328 | ||
329 | return 0; | |
330 | } | |
331 | ||
f0fba2ad | 332 | static int au1xpsc_pcm_probe(struct snd_soc_platform *platform) |
0f83d639 ML |
333 | { |
334 | if (!au1xpsc_audio_pcmdma[PCM_TX] || !au1xpsc_audio_pcmdma[PCM_RX]) | |
335 | return -ENODEV; | |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
0f83d639 | 340 | /* au1xpsc audio platform */ |
f0fba2ad | 341 | struct snd_soc_platform_driver au1xpsc_soc_platform = { |
0f83d639 | 342 | .probe = au1xpsc_pcm_probe, |
f0fba2ad | 343 | .ops = &au1xpsc_pcm_ops, |
0f83d639 ML |
344 | .pcm_new = au1xpsc_pcm_new, |
345 | .pcm_free = au1xpsc_pcm_free_dma_buffers, | |
346 | }; | |
347 | EXPORT_SYMBOL_GPL(au1xpsc_soc_platform); | |
348 | ||
349 | static int __devinit au1xpsc_pcm_drvprobe(struct platform_device *pdev) | |
4a161d23 ML |
350 | { |
351 | struct resource *r; | |
352 | int ret; | |
353 | ||
354 | if (au1xpsc_audio_pcmdma[PCM_TX] || au1xpsc_audio_pcmdma[PCM_RX]) | |
355 | return -EBUSY; | |
356 | ||
357 | /* TX DMA */ | |
358 | au1xpsc_audio_pcmdma[PCM_TX] | |
359 | = kzalloc(sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL); | |
360 | if (!au1xpsc_audio_pcmdma[PCM_TX]) | |
361 | return -ENOMEM; | |
362 | ||
363 | r = platform_get_resource(pdev, IORESOURCE_DMA, 0); | |
364 | if (!r) { | |
365 | ret = -ENODEV; | |
366 | goto out1; | |
367 | } | |
368 | (au1xpsc_audio_pcmdma[PCM_TX])->ddma_id = r->start; | |
369 | ||
370 | /* RX DMA */ | |
371 | au1xpsc_audio_pcmdma[PCM_RX] | |
372 | = kzalloc(sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL); | |
373 | if (!au1xpsc_audio_pcmdma[PCM_RX]) | |
374 | return -ENOMEM; | |
375 | ||
376 | r = platform_get_resource(pdev, IORESOURCE_DMA, 1); | |
377 | if (!r) { | |
378 | ret = -ENODEV; | |
379 | goto out2; | |
380 | } | |
381 | (au1xpsc_audio_pcmdma[PCM_RX])->ddma_id = r->start; | |
382 | ||
f0fba2ad | 383 | ret = snd_soc_register_platform(&pdev->dev, &au1xpsc_soc_platform); |
0f83d639 ML |
384 | if (!ret) |
385 | return ret; | |
4a161d23 ML |
386 | |
387 | out2: | |
388 | kfree(au1xpsc_audio_pcmdma[PCM_RX]); | |
389 | au1xpsc_audio_pcmdma[PCM_RX] = NULL; | |
390 | out1: | |
391 | kfree(au1xpsc_audio_pcmdma[PCM_TX]); | |
392 | au1xpsc_audio_pcmdma[PCM_TX] = NULL; | |
393 | return ret; | |
394 | } | |
395 | ||
0f83d639 | 396 | static int __devexit au1xpsc_pcm_drvremove(struct platform_device *pdev) |
4a161d23 ML |
397 | { |
398 | int i; | |
399 | ||
f0fba2ad | 400 | snd_soc_unregister_platform(&pdev->dev); |
0f83d639 | 401 | |
4a161d23 ML |
402 | for (i = 0; i < 2; i++) { |
403 | if (au1xpsc_audio_pcmdma[i]) { | |
404 | au1x_pcm_dbdma_free(au1xpsc_audio_pcmdma[i]); | |
405 | kfree(au1xpsc_audio_pcmdma[i]); | |
406 | au1xpsc_audio_pcmdma[i] = NULL; | |
407 | } | |
408 | } | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
0f83d639 ML |
413 | static struct platform_driver au1xpsc_pcm_driver = { |
414 | .driver = { | |
f0fba2ad | 415 | .name = "au1xpsc-pcm-audio", |
0f83d639 ML |
416 | .owner = THIS_MODULE, |
417 | }, | |
418 | .probe = au1xpsc_pcm_drvprobe, | |
419 | .remove = __devexit_p(au1xpsc_pcm_drvremove), | |
4a161d23 | 420 | }; |
4a161d23 | 421 | |
0f83d639 | 422 | static int __init au1xpsc_audio_dbdma_load(void) |
4a161d23 ML |
423 | { |
424 | au1xpsc_audio_pcmdma[PCM_TX] = NULL; | |
425 | au1xpsc_audio_pcmdma[PCM_RX] = NULL; | |
0f83d639 | 426 | return platform_driver_register(&au1xpsc_pcm_driver); |
4a161d23 ML |
427 | } |
428 | ||
0f83d639 | 429 | static void __exit au1xpsc_audio_dbdma_unload(void) |
4a161d23 | 430 | { |
0f83d639 ML |
431 | platform_driver_unregister(&au1xpsc_pcm_driver); |
432 | } | |
433 | ||
434 | module_init(au1xpsc_audio_dbdma_load); | |
435 | module_exit(au1xpsc_audio_dbdma_unload); | |
436 | ||
437 | ||
438 | struct platform_device *au1xpsc_pcm_add(struct platform_device *pdev) | |
439 | { | |
440 | struct resource *res, *r; | |
441 | struct platform_device *pd; | |
442 | int id[2]; | |
443 | int ret; | |
444 | ||
445 | r = platform_get_resource(pdev, IORESOURCE_DMA, 0); | |
446 | if (!r) | |
447 | return NULL; | |
448 | id[0] = r->start; | |
449 | ||
450 | r = platform_get_resource(pdev, IORESOURCE_DMA, 1); | |
451 | if (!r) | |
452 | return NULL; | |
453 | id[1] = r->start; | |
454 | ||
455 | res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL); | |
456 | if (!res) | |
457 | return NULL; | |
458 | ||
459 | res[0].start = res[0].end = id[0]; | |
460 | res[1].start = res[1].end = id[1]; | |
461 | res[0].flags = res[1].flags = IORESOURCE_DMA; | |
462 | ||
463 | pd = platform_device_alloc("au1xpsc-pcm", -1); | |
464 | if (!pd) | |
465 | goto out; | |
466 | ||
467 | pd->resource = res; | |
468 | pd->num_resources = 2; | |
469 | ||
470 | ret = platform_device_add(pd); | |
471 | if (!ret) | |
472 | return pd; | |
473 | ||
efd9eb96 | 474 | platform_device_put(pd); |
0f83d639 ML |
475 | out: |
476 | kfree(res); | |
477 | return NULL; | |
4a161d23 | 478 | } |
0f83d639 | 479 | EXPORT_SYMBOL_GPL(au1xpsc_pcm_add); |
4a161d23 | 480 | |
0f83d639 ML |
481 | void au1xpsc_pcm_destroy(struct platform_device *dmapd) |
482 | { | |
1bc80798 | 483 | if (dmapd) |
0f83d639 | 484 | platform_device_unregister(dmapd); |
0f83d639 ML |
485 | } |
486 | EXPORT_SYMBOL_GPL(au1xpsc_pcm_destroy); | |
4a161d23 ML |
487 | |
488 | MODULE_LICENSE("GPL"); | |
489 | MODULE_DESCRIPTION("Au12x0/Au1550 PSC Audio DMA driver"); | |
0f83d639 | 490 | MODULE_AUTHOR("Manuel Lauss"); |