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., | |
5 | * Manuel Lauss <mano@roarinelk.homelinux.net> | |
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) */ | |
54 | unsigned long dma_area; /* address of queued DMA area */ | |
55 | unsigned long dma_area_s; /* start address of DMA area */ | |
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 | | |
85 | SNDRV_PCM_INFO_INTERLEAVED, | |
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 | { | |
97 | au1xxx_dbdma_put_source_flags(cd->ddma_chan, | |
98 | (void *)phys_to_virt(cd->dma_area), | |
99 | cd->period_bytes, DDMA_FLAGS_IE); | |
100 | ||
101 | /* update next-to-queue period */ | |
102 | ++cd->q_period; | |
103 | cd->dma_area += cd->period_bytes; | |
104 | if (cd->q_period >= cd->periods) { | |
105 | cd->q_period = 0; | |
106 | cd->dma_area = cd->dma_area_s; | |
107 | } | |
108 | } | |
109 | ||
110 | static void au1x_pcm_queue_rx(struct au1xpsc_audio_dmadata *cd) | |
111 | { | |
112 | au1xxx_dbdma_put_dest_flags(cd->ddma_chan, | |
113 | (void *)phys_to_virt(cd->dma_area), | |
114 | cd->period_bytes, DDMA_FLAGS_IE); | |
115 | ||
116 | /* update next-to-queue period */ | |
117 | ++cd->q_period; | |
118 | cd->dma_area += cd->period_bytes; | |
119 | if (cd->q_period >= cd->periods) { | |
120 | cd->q_period = 0; | |
121 | cd->dma_area = cd->dma_area_s; | |
122 | } | |
123 | } | |
124 | ||
125 | static void au1x_pcm_dmatx_cb(int irq, void *dev_id) | |
126 | { | |
127 | struct au1xpsc_audio_dmadata *cd = dev_id; | |
128 | ||
129 | cd->pos += cd->period_bytes; | |
130 | if (++cd->curr_period >= cd->periods) { | |
131 | cd->pos = 0; | |
132 | cd->curr_period = 0; | |
133 | } | |
134 | snd_pcm_period_elapsed(cd->substream); | |
135 | au1x_pcm_queue_tx(cd); | |
136 | } | |
137 | ||
138 | static void au1x_pcm_dmarx_cb(int irq, void *dev_id) | |
139 | { | |
140 | struct au1xpsc_audio_dmadata *cd = dev_id; | |
141 | ||
142 | cd->pos += cd->period_bytes; | |
143 | if (++cd->curr_period >= cd->periods) { | |
144 | cd->pos = 0; | |
145 | cd->curr_period = 0; | |
146 | } | |
147 | snd_pcm_period_elapsed(cd->substream); | |
148 | au1x_pcm_queue_rx(cd); | |
149 | } | |
150 | ||
151 | static void au1x_pcm_dbdma_free(struct au1xpsc_audio_dmadata *pcd) | |
152 | { | |
153 | if (pcd->ddma_chan) { | |
154 | au1xxx_dbdma_stop(pcd->ddma_chan); | |
155 | au1xxx_dbdma_reset(pcd->ddma_chan); | |
156 | au1xxx_dbdma_chan_free(pcd->ddma_chan); | |
157 | pcd->ddma_chan = 0; | |
158 | pcd->msbits = 0; | |
159 | } | |
160 | } | |
161 | ||
162 | /* in case of missing DMA ring or changed TX-source / RX-dest bit widths, | |
163 | * allocate (or reallocate) a 2-descriptor DMA ring with bit depth according | |
164 | * to ALSA-supplied sample depth. This is due to limitations in the dbdma api | |
165 | * (cannot adjust source/dest widths of already allocated descriptor ring). | |
166 | */ | |
167 | static int au1x_pcm_dbdma_realloc(struct au1xpsc_audio_dmadata *pcd, | |
168 | int stype, int msbits) | |
169 | { | |
170 | /* DMA only in 8/16/32 bit widths */ | |
171 | if (msbits == 24) | |
172 | msbits = 32; | |
173 | ||
174 | /* check current config: correct bits and descriptors allocated? */ | |
175 | if ((pcd->ddma_chan) && (msbits == pcd->msbits)) | |
176 | goto out; /* all ok! */ | |
177 | ||
178 | au1x_pcm_dbdma_free(pcd); | |
179 | ||
180 | if (stype == PCM_RX) | |
181 | pcd->ddma_chan = au1xxx_dbdma_chan_alloc(pcd->ddma_id, | |
182 | DSCR_CMD0_ALWAYS, | |
183 | au1x_pcm_dmarx_cb, (void *)pcd); | |
184 | else | |
185 | pcd->ddma_chan = au1xxx_dbdma_chan_alloc(DSCR_CMD0_ALWAYS, | |
186 | pcd->ddma_id, | |
187 | au1x_pcm_dmatx_cb, (void *)pcd); | |
188 | ||
189 | if (!pcd->ddma_chan) | |
c19a28e1 | 190 | return -ENOMEM; |
4a161d23 ML |
191 | |
192 | au1xxx_dbdma_set_devwidth(pcd->ddma_chan, msbits); | |
193 | au1xxx_dbdma_ring_alloc(pcd->ddma_chan, 2); | |
194 | ||
195 | pcd->msbits = msbits; | |
196 | ||
197 | au1xxx_dbdma_stop(pcd->ddma_chan); | |
198 | au1xxx_dbdma_reset(pcd->ddma_chan); | |
199 | ||
200 | out: | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static int au1xpsc_pcm_hw_params(struct snd_pcm_substream *substream, | |
205 | struct snd_pcm_hw_params *params) | |
206 | { | |
207 | struct snd_pcm_runtime *runtime = substream->runtime; | |
208 | struct au1xpsc_audio_dmadata *pcd; | |
209 | int stype, ret; | |
210 | ||
211 | ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params)); | |
212 | if (ret < 0) | |
213 | goto out; | |
214 | ||
215 | stype = SUBSTREAM_TYPE(substream); | |
216 | pcd = au1xpsc_audio_pcmdma[stype]; | |
217 | ||
218 | DBG("runtime->dma_area = 0x%08lx dma_addr_t = 0x%08lx dma_size = %d " | |
219 | "runtime->min_align %d\n", | |
220 | (unsigned long)runtime->dma_area, | |
221 | (unsigned long)runtime->dma_addr, runtime->dma_bytes, | |
222 | runtime->min_align); | |
223 | ||
224 | DBG("bits %d frags %d frag_bytes %d is_rx %d\n", params->msbits, | |
225 | params_periods(params), params_period_bytes(params), stype); | |
226 | ||
227 | ret = au1x_pcm_dbdma_realloc(pcd, stype, params->msbits); | |
228 | if (ret) { | |
229 | MSG("DDMA channel (re)alloc failed!\n"); | |
230 | goto out; | |
231 | } | |
232 | ||
233 | pcd->substream = substream; | |
234 | pcd->period_bytes = params_period_bytes(params); | |
235 | pcd->periods = params_periods(params); | |
236 | pcd->dma_area_s = pcd->dma_area = (unsigned long)runtime->dma_addr; | |
237 | pcd->q_period = 0; | |
238 | pcd->curr_period = 0; | |
239 | pcd->pos = 0; | |
240 | ||
241 | ret = 0; | |
242 | out: | |
243 | return ret; | |
244 | } | |
245 | ||
246 | static int au1xpsc_pcm_hw_free(struct snd_pcm_substream *substream) | |
247 | { | |
248 | snd_pcm_lib_free_pages(substream); | |
249 | return 0; | |
250 | } | |
251 | ||
252 | static int au1xpsc_pcm_prepare(struct snd_pcm_substream *substream) | |
253 | { | |
254 | struct au1xpsc_audio_dmadata *pcd = | |
255 | au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]; | |
256 | ||
257 | au1xxx_dbdma_reset(pcd->ddma_chan); | |
258 | ||
259 | if (SUBSTREAM_TYPE(substream) == PCM_RX) { | |
260 | au1x_pcm_queue_rx(pcd); | |
261 | au1x_pcm_queue_rx(pcd); | |
262 | } else { | |
263 | au1x_pcm_queue_tx(pcd); | |
264 | au1x_pcm_queue_tx(pcd); | |
265 | } | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | static int au1xpsc_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
271 | { | |
272 | u32 c = au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]->ddma_chan; | |
273 | ||
274 | switch (cmd) { | |
275 | case SNDRV_PCM_TRIGGER_START: | |
276 | case SNDRV_PCM_TRIGGER_RESUME: | |
277 | au1xxx_dbdma_start(c); | |
278 | break; | |
279 | case SNDRV_PCM_TRIGGER_STOP: | |
280 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
281 | au1xxx_dbdma_stop(c); | |
282 | break; | |
283 | default: | |
284 | return -EINVAL; | |
285 | } | |
286 | return 0; | |
287 | } | |
288 | ||
289 | static snd_pcm_uframes_t | |
290 | au1xpsc_pcm_pointer(struct snd_pcm_substream *substream) | |
291 | { | |
292 | return bytes_to_frames(substream->runtime, | |
293 | au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]->pos); | |
294 | } | |
295 | ||
296 | static int au1xpsc_pcm_open(struct snd_pcm_substream *substream) | |
297 | { | |
298 | snd_soc_set_runtime_hwparams(substream, &au1xpsc_pcm_hardware); | |
299 | return 0; | |
300 | } | |
301 | ||
302 | static int au1xpsc_pcm_close(struct snd_pcm_substream *substream) | |
303 | { | |
304 | au1x_pcm_dbdma_free(au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]); | |
305 | return 0; | |
306 | } | |
307 | ||
b2a19d02 | 308 | static struct snd_pcm_ops au1xpsc_pcm_ops = { |
4a161d23 ML |
309 | .open = au1xpsc_pcm_open, |
310 | .close = au1xpsc_pcm_close, | |
311 | .ioctl = snd_pcm_lib_ioctl, | |
312 | .hw_params = au1xpsc_pcm_hw_params, | |
313 | .hw_free = au1xpsc_pcm_hw_free, | |
314 | .prepare = au1xpsc_pcm_prepare, | |
315 | .trigger = au1xpsc_pcm_trigger, | |
316 | .pointer = au1xpsc_pcm_pointer, | |
317 | }; | |
318 | ||
319 | static void au1xpsc_pcm_free_dma_buffers(struct snd_pcm *pcm) | |
320 | { | |
321 | snd_pcm_lib_preallocate_free_for_all(pcm); | |
322 | } | |
323 | ||
324 | static int au1xpsc_pcm_new(struct snd_card *card, | |
325 | struct snd_soc_dai *dai, | |
326 | struct snd_pcm *pcm) | |
327 | { | |
328 | snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, | |
329 | card->dev, AU1XPSC_BUFFER_MIN_BYTES, (4096 * 1024) - 1); | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | static int au1xpsc_pcm_probe(struct platform_device *pdev) | |
335 | { | |
336 | struct resource *r; | |
337 | int ret; | |
338 | ||
339 | if (au1xpsc_audio_pcmdma[PCM_TX] || au1xpsc_audio_pcmdma[PCM_RX]) | |
340 | return -EBUSY; | |
341 | ||
342 | /* TX DMA */ | |
343 | au1xpsc_audio_pcmdma[PCM_TX] | |
344 | = kzalloc(sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL); | |
345 | if (!au1xpsc_audio_pcmdma[PCM_TX]) | |
346 | return -ENOMEM; | |
347 | ||
348 | r = platform_get_resource(pdev, IORESOURCE_DMA, 0); | |
349 | if (!r) { | |
350 | ret = -ENODEV; | |
351 | goto out1; | |
352 | } | |
353 | (au1xpsc_audio_pcmdma[PCM_TX])->ddma_id = r->start; | |
354 | ||
355 | /* RX DMA */ | |
356 | au1xpsc_audio_pcmdma[PCM_RX] | |
357 | = kzalloc(sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL); | |
358 | if (!au1xpsc_audio_pcmdma[PCM_RX]) | |
359 | return -ENOMEM; | |
360 | ||
361 | r = platform_get_resource(pdev, IORESOURCE_DMA, 1); | |
362 | if (!r) { | |
363 | ret = -ENODEV; | |
364 | goto out2; | |
365 | } | |
366 | (au1xpsc_audio_pcmdma[PCM_RX])->ddma_id = r->start; | |
367 | ||
368 | return 0; | |
369 | ||
370 | out2: | |
371 | kfree(au1xpsc_audio_pcmdma[PCM_RX]); | |
372 | au1xpsc_audio_pcmdma[PCM_RX] = NULL; | |
373 | out1: | |
374 | kfree(au1xpsc_audio_pcmdma[PCM_TX]); | |
375 | au1xpsc_audio_pcmdma[PCM_TX] = NULL; | |
376 | return ret; | |
377 | } | |
378 | ||
379 | static int au1xpsc_pcm_remove(struct platform_device *pdev) | |
380 | { | |
381 | int i; | |
382 | ||
383 | for (i = 0; i < 2; i++) { | |
384 | if (au1xpsc_audio_pcmdma[i]) { | |
385 | au1x_pcm_dbdma_free(au1xpsc_audio_pcmdma[i]); | |
386 | kfree(au1xpsc_audio_pcmdma[i]); | |
387 | au1xpsc_audio_pcmdma[i] = NULL; | |
388 | } | |
389 | } | |
390 | ||
391 | return 0; | |
392 | } | |
393 | ||
394 | /* au1xpsc audio platform */ | |
395 | struct snd_soc_platform au1xpsc_soc_platform = { | |
396 | .name = "au1xpsc-pcm-dbdma", | |
397 | .probe = au1xpsc_pcm_probe, | |
398 | .remove = au1xpsc_pcm_remove, | |
399 | .pcm_ops = &au1xpsc_pcm_ops, | |
400 | .pcm_new = au1xpsc_pcm_new, | |
401 | .pcm_free = au1xpsc_pcm_free_dma_buffers, | |
402 | }; | |
403 | EXPORT_SYMBOL_GPL(au1xpsc_soc_platform); | |
404 | ||
405 | static int __init au1xpsc_audio_dbdma_init(void) | |
406 | { | |
407 | au1xpsc_audio_pcmdma[PCM_TX] = NULL; | |
408 | au1xpsc_audio_pcmdma[PCM_RX] = NULL; | |
958e792c | 409 | return snd_soc_register_platform(&au1xpsc_soc_platform); |
4a161d23 ML |
410 | } |
411 | ||
412 | static void __exit au1xpsc_audio_dbdma_exit(void) | |
413 | { | |
958e792c | 414 | snd_soc_unregister_platform(&au1xpsc_soc_platform); |
4a161d23 ML |
415 | } |
416 | ||
417 | module_init(au1xpsc_audio_dbdma_init); | |
418 | module_exit(au1xpsc_audio_dbdma_exit); | |
419 | ||
420 | MODULE_LICENSE("GPL"); | |
421 | MODULE_DESCRIPTION("Au12x0/Au1550 PSC Audio DMA driver"); | |
422 | MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>"); |