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 | * | |
4a161d23 ML |
13 | */ |
14 | ||
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/dma-mapping.h> | |
21 | ||
22 | #include <sound/core.h> | |
23 | #include <sound/pcm.h> | |
24 | #include <sound/pcm_params.h> | |
25 | #include <sound/soc.h> | |
26 | ||
27 | #include <asm/mach-au1x00/au1000.h> | |
28 | #include <asm/mach-au1x00/au1xxx_dbdma.h> | |
29 | #include <asm/mach-au1x00/au1xxx_psc.h> | |
30 | ||
31 | #include "psc.h" | |
32 | ||
33 | /*#define PCM_DEBUG*/ | |
34 | ||
35 | #define MSG(x...) printk(KERN_INFO "au1xpsc_pcm: " x) | |
36 | #ifdef PCM_DEBUG | |
37 | #define DBG MSG | |
38 | #else | |
39 | #define DBG(x...) do {} while (0) | |
40 | #endif | |
41 | ||
42 | struct au1xpsc_audio_dmadata { | |
43 | /* DDMA control data */ | |
44 | unsigned int ddma_id; /* DDMA direction ID for this PSC */ | |
45 | u32 ddma_chan; /* DDMA context */ | |
46 | ||
47 | /* PCM context (for irq handlers) */ | |
48 | struct snd_pcm_substream *substream; | |
49 | unsigned long curr_period; /* current segment DDMA is working on */ | |
50 | unsigned long q_period; /* queue period(s) */ | |
963accbc ML |
51 | dma_addr_t dma_area; /* address of queued DMA area */ |
52 | dma_addr_t dma_area_s; /* start address of DMA area */ | |
4a161d23 ML |
53 | unsigned long pos; /* current byte position being played */ |
54 | unsigned long periods; /* number of SG segments in total */ | |
55 | unsigned long period_bytes; /* size in bytes of one SG segment */ | |
56 | ||
57 | /* runtime data */ | |
58 | int msbits; | |
59 | }; | |
60 | ||
4a161d23 ML |
61 | /* |
62 | * These settings are somewhat okay, at least on my machine audio plays | |
63 | * almost skip-free. Especially the 64kB buffer seems to help a LOT. | |
64 | */ | |
65 | #define AU1XPSC_PERIOD_MIN_BYTES 1024 | |
66 | #define AU1XPSC_BUFFER_MIN_BYTES 65536 | |
67 | ||
4a161d23 ML |
68 | /* PCM hardware DMA capabilities - platform specific */ |
69 | static const struct snd_pcm_hardware au1xpsc_pcm_hardware = { | |
70 | .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | | |
2008f137 | 71 | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BATCH, |
4a161d23 ML |
72 | .period_bytes_min = AU1XPSC_PERIOD_MIN_BYTES, |
73 | .period_bytes_max = 4096 * 1024 - 1, | |
74 | .periods_min = 2, | |
75 | .periods_max = 4096, /* 2 to as-much-as-you-like */ | |
76 | .buffer_bytes_max = 4096 * 1024 - 1, | |
77 | .fifo_size = 16, /* fifo entries of AC97/I2S PSC */ | |
78 | }; | |
79 | ||
80 | static void au1x_pcm_queue_tx(struct au1xpsc_audio_dmadata *cd) | |
81 | { | |
963accbc | 82 | au1xxx_dbdma_put_source(cd->ddma_chan, cd->dma_area, |
4a161d23 ML |
83 | cd->period_bytes, DDMA_FLAGS_IE); |
84 | ||
85 | /* update next-to-queue period */ | |
86 | ++cd->q_period; | |
87 | cd->dma_area += cd->period_bytes; | |
88 | if (cd->q_period >= cd->periods) { | |
89 | cd->q_period = 0; | |
90 | cd->dma_area = cd->dma_area_s; | |
91 | } | |
92 | } | |
93 | ||
94 | static void au1x_pcm_queue_rx(struct au1xpsc_audio_dmadata *cd) | |
95 | { | |
963accbc | 96 | au1xxx_dbdma_put_dest(cd->ddma_chan, cd->dma_area, |
ea071cc7 | 97 | cd->period_bytes, DDMA_FLAGS_IE); |
4a161d23 ML |
98 | |
99 | /* update next-to-queue period */ | |
100 | ++cd->q_period; | |
101 | cd->dma_area += cd->period_bytes; | |
102 | if (cd->q_period >= cd->periods) { | |
103 | cd->q_period = 0; | |
104 | cd->dma_area = cd->dma_area_s; | |
105 | } | |
106 | } | |
107 | ||
108 | static void au1x_pcm_dmatx_cb(int irq, void *dev_id) | |
109 | { | |
110 | struct au1xpsc_audio_dmadata *cd = dev_id; | |
111 | ||
112 | cd->pos += cd->period_bytes; | |
113 | if (++cd->curr_period >= cd->periods) { | |
114 | cd->pos = 0; | |
115 | cd->curr_period = 0; | |
116 | } | |
117 | snd_pcm_period_elapsed(cd->substream); | |
118 | au1x_pcm_queue_tx(cd); | |
119 | } | |
120 | ||
121 | static void au1x_pcm_dmarx_cb(int irq, void *dev_id) | |
122 | { | |
123 | struct au1xpsc_audio_dmadata *cd = dev_id; | |
124 | ||
125 | cd->pos += cd->period_bytes; | |
126 | if (++cd->curr_period >= cd->periods) { | |
127 | cd->pos = 0; | |
128 | cd->curr_period = 0; | |
129 | } | |
130 | snd_pcm_period_elapsed(cd->substream); | |
131 | au1x_pcm_queue_rx(cd); | |
132 | } | |
133 | ||
134 | static void au1x_pcm_dbdma_free(struct au1xpsc_audio_dmadata *pcd) | |
135 | { | |
136 | if (pcd->ddma_chan) { | |
137 | au1xxx_dbdma_stop(pcd->ddma_chan); | |
138 | au1xxx_dbdma_reset(pcd->ddma_chan); | |
139 | au1xxx_dbdma_chan_free(pcd->ddma_chan); | |
140 | pcd->ddma_chan = 0; | |
141 | pcd->msbits = 0; | |
142 | } | |
143 | } | |
144 | ||
145 | /* in case of missing DMA ring or changed TX-source / RX-dest bit widths, | |
146 | * allocate (or reallocate) a 2-descriptor DMA ring with bit depth according | |
147 | * to ALSA-supplied sample depth. This is due to limitations in the dbdma api | |
148 | * (cannot adjust source/dest widths of already allocated descriptor ring). | |
149 | */ | |
150 | static int au1x_pcm_dbdma_realloc(struct au1xpsc_audio_dmadata *pcd, | |
151 | int stype, int msbits) | |
152 | { | |
153 | /* DMA only in 8/16/32 bit widths */ | |
154 | if (msbits == 24) | |
155 | msbits = 32; | |
156 | ||
157 | /* check current config: correct bits and descriptors allocated? */ | |
158 | if ((pcd->ddma_chan) && (msbits == pcd->msbits)) | |
159 | goto out; /* all ok! */ | |
160 | ||
161 | au1x_pcm_dbdma_free(pcd); | |
162 | ||
25942fdc | 163 | if (stype == SNDRV_PCM_STREAM_CAPTURE) |
4a161d23 ML |
164 | pcd->ddma_chan = au1xxx_dbdma_chan_alloc(pcd->ddma_id, |
165 | DSCR_CMD0_ALWAYS, | |
166 | au1x_pcm_dmarx_cb, (void *)pcd); | |
167 | else | |
168 | pcd->ddma_chan = au1xxx_dbdma_chan_alloc(DSCR_CMD0_ALWAYS, | |
169 | pcd->ddma_id, | |
170 | au1x_pcm_dmatx_cb, (void *)pcd); | |
171 | ||
172 | if (!pcd->ddma_chan) | |
c19a28e1 | 173 | return -ENOMEM; |
4a161d23 ML |
174 | |
175 | au1xxx_dbdma_set_devwidth(pcd->ddma_chan, msbits); | |
176 | au1xxx_dbdma_ring_alloc(pcd->ddma_chan, 2); | |
177 | ||
178 | pcd->msbits = msbits; | |
179 | ||
180 | au1xxx_dbdma_stop(pcd->ddma_chan); | |
181 | au1xxx_dbdma_reset(pcd->ddma_chan); | |
182 | ||
183 | out: | |
184 | return 0; | |
185 | } | |
186 | ||
ffc4fdbb ML |
187 | static inline struct au1xpsc_audio_dmadata *to_dmadata(struct snd_pcm_substream *ss) |
188 | { | |
189 | struct snd_soc_pcm_runtime *rtd = ss->private_data; | |
190 | struct au1xpsc_audio_dmadata *pcd = | |
191 | snd_soc_platform_get_drvdata(rtd->platform); | |
25942fdc | 192 | return &pcd[ss->stream]; |
ffc4fdbb ML |
193 | } |
194 | ||
4a161d23 ML |
195 | static int au1xpsc_pcm_hw_params(struct snd_pcm_substream *substream, |
196 | struct snd_pcm_hw_params *params) | |
197 | { | |
198 | struct snd_pcm_runtime *runtime = substream->runtime; | |
199 | struct au1xpsc_audio_dmadata *pcd; | |
200 | int stype, ret; | |
201 | ||
202 | ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params)); | |
203 | if (ret < 0) | |
204 | goto out; | |
205 | ||
25942fdc | 206 | stype = substream->stream; |
ffc4fdbb | 207 | pcd = to_dmadata(substream); |
4a161d23 | 208 | |
896491b3 HS |
209 | DBG("runtime->dma_area = 0x%08lx dma_addr_t = 0x%08lx dma_size = %zu " |
210 | "runtime->min_align %lu\n", | |
4a161d23 ML |
211 | (unsigned long)runtime->dma_area, |
212 | (unsigned long)runtime->dma_addr, runtime->dma_bytes, | |
213 | runtime->min_align); | |
214 | ||
215 | DBG("bits %d frags %d frag_bytes %d is_rx %d\n", params->msbits, | |
216 | params_periods(params), params_period_bytes(params), stype); | |
217 | ||
218 | ret = au1x_pcm_dbdma_realloc(pcd, stype, params->msbits); | |
219 | if (ret) { | |
220 | MSG("DDMA channel (re)alloc failed!\n"); | |
221 | goto out; | |
222 | } | |
223 | ||
224 | pcd->substream = substream; | |
225 | pcd->period_bytes = params_period_bytes(params); | |
226 | pcd->periods = params_periods(params); | |
963accbc | 227 | pcd->dma_area_s = pcd->dma_area = runtime->dma_addr; |
4a161d23 ML |
228 | pcd->q_period = 0; |
229 | pcd->curr_period = 0; | |
230 | pcd->pos = 0; | |
231 | ||
232 | ret = 0; | |
233 | out: | |
234 | return ret; | |
235 | } | |
236 | ||
237 | static int au1xpsc_pcm_hw_free(struct snd_pcm_substream *substream) | |
238 | { | |
239 | snd_pcm_lib_free_pages(substream); | |
240 | return 0; | |
241 | } | |
242 | ||
243 | static int au1xpsc_pcm_prepare(struct snd_pcm_substream *substream) | |
244 | { | |
ffc4fdbb | 245 | struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream); |
4a161d23 ML |
246 | |
247 | au1xxx_dbdma_reset(pcd->ddma_chan); | |
248 | ||
25942fdc | 249 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { |
4a161d23 ML |
250 | au1x_pcm_queue_rx(pcd); |
251 | au1x_pcm_queue_rx(pcd); | |
252 | } else { | |
253 | au1x_pcm_queue_tx(pcd); | |
254 | au1x_pcm_queue_tx(pcd); | |
255 | } | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
260 | static int au1xpsc_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
261 | { | |
ffc4fdbb | 262 | u32 c = to_dmadata(substream)->ddma_chan; |
4a161d23 ML |
263 | |
264 | switch (cmd) { | |
265 | case SNDRV_PCM_TRIGGER_START: | |
266 | case SNDRV_PCM_TRIGGER_RESUME: | |
267 | au1xxx_dbdma_start(c); | |
268 | break; | |
269 | case SNDRV_PCM_TRIGGER_STOP: | |
270 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
271 | au1xxx_dbdma_stop(c); | |
272 | break; | |
273 | default: | |
274 | return -EINVAL; | |
275 | } | |
276 | return 0; | |
277 | } | |
278 | ||
279 | static snd_pcm_uframes_t | |
280 | au1xpsc_pcm_pointer(struct snd_pcm_substream *substream) | |
281 | { | |
ffc4fdbb | 282 | return bytes_to_frames(substream->runtime, to_dmadata(substream)->pos); |
4a161d23 ML |
283 | } |
284 | ||
285 | static int au1xpsc_pcm_open(struct snd_pcm_substream *substream) | |
286 | { | |
5b0912be ML |
287 | struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream); |
288 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
25942fdc | 289 | int stype = substream->stream, *dmaids; |
5b0912be ML |
290 | |
291 | dmaids = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); | |
292 | if (!dmaids) | |
293 | return -ENODEV; /* whoa, has ordering changed? */ | |
294 | ||
295 | pcd->ddma_id = dmaids[stype]; | |
296 | ||
4a161d23 ML |
297 | snd_soc_set_runtime_hwparams(substream, &au1xpsc_pcm_hardware); |
298 | return 0; | |
299 | } | |
300 | ||
301 | static int au1xpsc_pcm_close(struct snd_pcm_substream *substream) | |
302 | { | |
ffc4fdbb | 303 | au1x_pcm_dbdma_free(to_dmadata(substream)); |
4a161d23 ML |
304 | return 0; |
305 | } | |
306 | ||
b2a19d02 | 307 | static struct snd_pcm_ops au1xpsc_pcm_ops = { |
4a161d23 ML |
308 | .open = au1xpsc_pcm_open, |
309 | .close = au1xpsc_pcm_close, | |
310 | .ioctl = snd_pcm_lib_ioctl, | |
311 | .hw_params = au1xpsc_pcm_hw_params, | |
312 | .hw_free = au1xpsc_pcm_hw_free, | |
313 | .prepare = au1xpsc_pcm_prepare, | |
314 | .trigger = au1xpsc_pcm_trigger, | |
315 | .pointer = au1xpsc_pcm_pointer, | |
316 | }; | |
317 | ||
552d1ef6 | 318 | static int au1xpsc_pcm_new(struct snd_soc_pcm_runtime *rtd) |
4a161d23 | 319 | { |
552d1ef6 LG |
320 | struct snd_card *card = rtd->card->snd_card; |
321 | struct snd_pcm *pcm = rtd->pcm; | |
322 | ||
4a161d23 ML |
323 | snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, |
324 | card->dev, AU1XPSC_BUFFER_MIN_BYTES, (4096 * 1024) - 1); | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
0f83d639 | 329 | /* au1xpsc audio platform */ |
bba59f33 | 330 | static struct snd_soc_platform_driver au1xpsc_soc_platform = { |
f0fba2ad | 331 | .ops = &au1xpsc_pcm_ops, |
0f83d639 | 332 | .pcm_new = au1xpsc_pcm_new, |
0f83d639 | 333 | }; |
0f83d639 | 334 | |
5c658be0 | 335 | static int au1xpsc_pcm_drvprobe(struct platform_device *pdev) |
4a161d23 | 336 | { |
ffc4fdbb | 337 | struct au1xpsc_audio_dmadata *dmadata; |
4a161d23 | 338 | |
be547dd1 JL |
339 | dmadata = devm_kzalloc(&pdev->dev, |
340 | 2 * sizeof(struct au1xpsc_audio_dmadata), | |
341 | GFP_KERNEL); | |
ffc4fdbb | 342 | if (!dmadata) |
4a161d23 ML |
343 | return -ENOMEM; |
344 | ||
ffc4fdbb | 345 | platform_set_drvdata(pdev, dmadata); |
4a161d23 | 346 | |
edd98a1a AL |
347 | return devm_snd_soc_register_platform(&pdev->dev, |
348 | &au1xpsc_soc_platform); | |
4a161d23 ML |
349 | } |
350 | ||
0f83d639 ML |
351 | static struct platform_driver au1xpsc_pcm_driver = { |
352 | .driver = { | |
ffc4fdbb | 353 | .name = "au1xpsc-pcm", |
0f83d639 ML |
354 | }, |
355 | .probe = au1xpsc_pcm_drvprobe, | |
4a161d23 | 356 | }; |
4a161d23 | 357 | |
8a124f9c | 358 | module_platform_driver(au1xpsc_pcm_driver); |
0f83d639 | 359 | |
4a161d23 ML |
360 | MODULE_LICENSE("GPL"); |
361 | MODULE_DESCRIPTION("Au12x0/Au1550 PSC Audio DMA driver"); | |
0f83d639 | 362 | MODULE_AUTHOR("Manuel Lauss"); |