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e24805dd AN |
1 | /* |
2 | * Generic TXx9 ACLC platform driver | |
3 | * | |
4 | * Copyright (C) 2009 Atsushi Nemoto | |
5 | * | |
6 | * Based on RBTX49xx patch from CELF patch archive. | |
7 | * (C) Copyright TOSHIBA CORPORATION 2004-2006 | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/scatterlist.h> | |
18 | #include <sound/core.h> | |
19 | #include <sound/pcm.h> | |
20 | #include <sound/pcm_params.h> | |
21 | #include <sound/soc.h> | |
22 | #include "txx9aclc.h" | |
23 | ||
24 | static const struct snd_pcm_hardware txx9aclc_pcm_hardware = { | |
25 | /* | |
26 | * REVISIT: SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | |
27 | * needs more works for noncoherent MIPS. | |
28 | */ | |
29 | .info = SNDRV_PCM_INFO_INTERLEAVED | | |
30 | SNDRV_PCM_INFO_BATCH | | |
31 | SNDRV_PCM_INFO_PAUSE, | |
32 | #ifdef __BIG_ENDIAN | |
33 | .formats = SNDRV_PCM_FMTBIT_S16_BE, | |
34 | #else | |
35 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
36 | #endif | |
37 | .period_bytes_min = 1024, | |
38 | .period_bytes_max = 8 * 1024, | |
39 | .periods_min = 2, | |
40 | .periods_max = 4096, | |
41 | .buffer_bytes_max = 32 * 1024, | |
42 | }; | |
43 | ||
44 | static int txx9aclc_pcm_hw_params(struct snd_pcm_substream *substream, | |
45 | struct snd_pcm_hw_params *params) | |
46 | { | |
47 | struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream); | |
48 | struct snd_soc_device *socdev = rtd->socdev; | |
49 | struct snd_pcm_runtime *runtime = substream->runtime; | |
50 | struct txx9aclc_dmadata *dmadata = runtime->private_data; | |
51 | int ret; | |
52 | ||
53 | ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params)); | |
54 | if (ret < 0) | |
55 | return ret; | |
56 | ||
57 | dev_dbg(socdev->dev, | |
58 | "runtime->dma_area = %#lx dma_addr = %#lx dma_bytes = %zd " | |
59 | "runtime->min_align %ld\n", | |
60 | (unsigned long)runtime->dma_area, | |
61 | (unsigned long)runtime->dma_addr, runtime->dma_bytes, | |
62 | runtime->min_align); | |
63 | dev_dbg(socdev->dev, | |
64 | "periods %d period_bytes %d stream %d\n", | |
65 | params_periods(params), params_period_bytes(params), | |
66 | substream->stream); | |
67 | ||
68 | dmadata->substream = substream; | |
69 | dmadata->pos = 0; | |
70 | return 0; | |
71 | } | |
72 | ||
73 | static int txx9aclc_pcm_hw_free(struct snd_pcm_substream *substream) | |
74 | { | |
75 | return snd_pcm_lib_free_pages(substream); | |
76 | } | |
77 | ||
78 | static int txx9aclc_pcm_prepare(struct snd_pcm_substream *substream) | |
79 | { | |
80 | struct snd_pcm_runtime *runtime = substream->runtime; | |
81 | struct txx9aclc_dmadata *dmadata = runtime->private_data; | |
82 | ||
83 | dmadata->dma_addr = runtime->dma_addr; | |
84 | dmadata->buffer_bytes = snd_pcm_lib_buffer_bytes(substream); | |
85 | dmadata->period_bytes = snd_pcm_lib_period_bytes(substream); | |
86 | ||
87 | if (dmadata->buffer_bytes == dmadata->period_bytes) { | |
88 | dmadata->frag_bytes = dmadata->period_bytes >> 1; | |
89 | dmadata->frags = 2; | |
90 | } else { | |
91 | dmadata->frag_bytes = dmadata->period_bytes; | |
92 | dmadata->frags = dmadata->buffer_bytes / dmadata->period_bytes; | |
93 | } | |
94 | dmadata->frag_count = 0; | |
95 | dmadata->pos = 0; | |
96 | return 0; | |
97 | } | |
98 | ||
99 | static void txx9aclc_dma_complete(void *arg) | |
100 | { | |
101 | struct txx9aclc_dmadata *dmadata = arg; | |
102 | unsigned long flags; | |
103 | ||
104 | /* dma completion handler cannot submit new operations */ | |
105 | spin_lock_irqsave(&dmadata->dma_lock, flags); | |
106 | if (dmadata->frag_count >= 0) { | |
107 | dmadata->dmacount--; | |
108 | BUG_ON(dmadata->dmacount < 0); | |
109 | tasklet_schedule(&dmadata->tasklet); | |
110 | } | |
111 | spin_unlock_irqrestore(&dmadata->dma_lock, flags); | |
112 | } | |
113 | ||
114 | static struct dma_async_tx_descriptor * | |
115 | txx9aclc_dma_submit(struct txx9aclc_dmadata *dmadata, dma_addr_t buf_dma_addr) | |
116 | { | |
117 | struct dma_chan *chan = dmadata->dma_chan; | |
118 | struct dma_async_tx_descriptor *desc; | |
119 | struct scatterlist sg; | |
120 | ||
121 | sg_init_table(&sg, 1); | |
122 | sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf_dma_addr)), | |
123 | dmadata->frag_bytes, buf_dma_addr & (PAGE_SIZE - 1)); | |
124 | sg_dma_address(&sg) = buf_dma_addr; | |
125 | desc = chan->device->device_prep_slave_sg(chan, &sg, 1, | |
126 | dmadata->substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? | |
127 | DMA_TO_DEVICE : DMA_FROM_DEVICE, | |
128 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
129 | if (!desc) { | |
130 | dev_err(&chan->dev->device, "cannot prepare slave dma\n"); | |
131 | return NULL; | |
132 | } | |
133 | desc->callback = txx9aclc_dma_complete; | |
134 | desc->callback_param = dmadata; | |
135 | desc->tx_submit(desc); | |
136 | return desc; | |
137 | } | |
138 | ||
139 | #define NR_DMA_CHAIN 2 | |
140 | ||
141 | static void txx9aclc_dma_tasklet(unsigned long data) | |
142 | { | |
143 | struct txx9aclc_dmadata *dmadata = (struct txx9aclc_dmadata *)data; | |
144 | struct dma_chan *chan = dmadata->dma_chan; | |
145 | struct dma_async_tx_descriptor *desc; | |
146 | struct snd_pcm_substream *substream = dmadata->substream; | |
147 | u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? | |
148 | ACCTL_AUDODMA : ACCTL_AUDIDMA; | |
149 | int i; | |
150 | unsigned long flags; | |
151 | ||
152 | spin_lock_irqsave(&dmadata->dma_lock, flags); | |
153 | if (dmadata->frag_count < 0) { | |
154 | struct txx9aclc_soc_device *dev = | |
155 | container_of(dmadata, struct txx9aclc_soc_device, | |
156 | dmadata[substream->stream]); | |
157 | struct txx9aclc_plat_drvdata *drvdata = | |
158 | txx9aclc_get_plat_drvdata(dev); | |
159 | void __iomem *base = drvdata->base; | |
160 | ||
161 | spin_unlock_irqrestore(&dmadata->dma_lock, flags); | |
162 | chan->device->device_terminate_all(chan); | |
163 | /* first time */ | |
164 | for (i = 0; i < NR_DMA_CHAIN; i++) { | |
165 | desc = txx9aclc_dma_submit(dmadata, | |
166 | dmadata->dma_addr + i * dmadata->frag_bytes); | |
167 | if (!desc) | |
168 | return; | |
169 | } | |
170 | dmadata->dmacount = NR_DMA_CHAIN; | |
171 | chan->device->device_issue_pending(chan); | |
172 | spin_lock_irqsave(&dmadata->dma_lock, flags); | |
173 | __raw_writel(ctlbit, base + ACCTLEN); | |
174 | dmadata->frag_count = NR_DMA_CHAIN % dmadata->frags; | |
175 | spin_unlock_irqrestore(&dmadata->dma_lock, flags); | |
176 | return; | |
177 | } | |
178 | BUG_ON(dmadata->dmacount >= NR_DMA_CHAIN); | |
179 | while (dmadata->dmacount < NR_DMA_CHAIN) { | |
180 | dmadata->dmacount++; | |
181 | spin_unlock_irqrestore(&dmadata->dma_lock, flags); | |
182 | desc = txx9aclc_dma_submit(dmadata, | |
183 | dmadata->dma_addr + | |
184 | dmadata->frag_count * dmadata->frag_bytes); | |
185 | if (!desc) | |
186 | return; | |
187 | chan->device->device_issue_pending(chan); | |
188 | ||
189 | spin_lock_irqsave(&dmadata->dma_lock, flags); | |
190 | dmadata->frag_count++; | |
191 | dmadata->frag_count %= dmadata->frags; | |
192 | dmadata->pos += dmadata->frag_bytes; | |
193 | dmadata->pos %= dmadata->buffer_bytes; | |
194 | if ((dmadata->frag_count * dmadata->frag_bytes) % | |
195 | dmadata->period_bytes == 0) | |
196 | snd_pcm_period_elapsed(substream); | |
197 | } | |
198 | spin_unlock_irqrestore(&dmadata->dma_lock, flags); | |
199 | } | |
200 | ||
201 | static int txx9aclc_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
202 | { | |
203 | struct txx9aclc_dmadata *dmadata = substream->runtime->private_data; | |
204 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
205 | struct txx9aclc_soc_device *dev = | |
206 | container_of(rtd->socdev, struct txx9aclc_soc_device, soc_dev); | |
207 | struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev); | |
208 | void __iomem *base = drvdata->base; | |
209 | unsigned long flags; | |
210 | int ret = 0; | |
211 | u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? | |
212 | ACCTL_AUDODMA : ACCTL_AUDIDMA; | |
213 | ||
214 | spin_lock_irqsave(&dmadata->dma_lock, flags); | |
215 | switch (cmd) { | |
216 | case SNDRV_PCM_TRIGGER_START: | |
217 | dmadata->frag_count = -1; | |
218 | tasklet_schedule(&dmadata->tasklet); | |
219 | break; | |
220 | case SNDRV_PCM_TRIGGER_STOP: | |
221 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
222 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
223 | __raw_writel(ctlbit, base + ACCTLDIS); | |
224 | break; | |
225 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
226 | case SNDRV_PCM_TRIGGER_RESUME: | |
227 | __raw_writel(ctlbit, base + ACCTLEN); | |
228 | break; | |
229 | default: | |
230 | ret = -EINVAL; | |
231 | } | |
232 | spin_unlock_irqrestore(&dmadata->dma_lock, flags); | |
233 | return ret; | |
234 | } | |
235 | ||
236 | static snd_pcm_uframes_t | |
237 | txx9aclc_pcm_pointer(struct snd_pcm_substream *substream) | |
238 | { | |
239 | struct txx9aclc_dmadata *dmadata = substream->runtime->private_data; | |
240 | ||
241 | return bytes_to_frames(substream->runtime, dmadata->pos); | |
242 | } | |
243 | ||
244 | static int txx9aclc_pcm_open(struct snd_pcm_substream *substream) | |
245 | { | |
246 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
247 | struct txx9aclc_soc_device *dev = | |
248 | container_of(rtd->socdev, struct txx9aclc_soc_device, soc_dev); | |
249 | struct txx9aclc_dmadata *dmadata = &dev->dmadata[substream->stream]; | |
250 | int ret; | |
251 | ||
252 | ret = snd_soc_set_runtime_hwparams(substream, &txx9aclc_pcm_hardware); | |
253 | if (ret) | |
254 | return ret; | |
255 | /* ensure that buffer size is a multiple of period size */ | |
256 | ret = snd_pcm_hw_constraint_integer(substream->runtime, | |
257 | SNDRV_PCM_HW_PARAM_PERIODS); | |
258 | if (ret < 0) | |
259 | return ret; | |
260 | substream->runtime->private_data = dmadata; | |
261 | return 0; | |
262 | } | |
263 | ||
264 | static int txx9aclc_pcm_close(struct snd_pcm_substream *substream) | |
265 | { | |
266 | struct txx9aclc_dmadata *dmadata = substream->runtime->private_data; | |
267 | struct dma_chan *chan = dmadata->dma_chan; | |
268 | ||
269 | dmadata->frag_count = -1; | |
270 | chan->device->device_terminate_all(chan); | |
271 | return 0; | |
272 | } | |
273 | ||
274 | static struct snd_pcm_ops txx9aclc_pcm_ops = { | |
275 | .open = txx9aclc_pcm_open, | |
276 | .close = txx9aclc_pcm_close, | |
277 | .ioctl = snd_pcm_lib_ioctl, | |
278 | .hw_params = txx9aclc_pcm_hw_params, | |
279 | .hw_free = txx9aclc_pcm_hw_free, | |
280 | .prepare = txx9aclc_pcm_prepare, | |
281 | .trigger = txx9aclc_pcm_trigger, | |
282 | .pointer = txx9aclc_pcm_pointer, | |
283 | }; | |
284 | ||
285 | static void txx9aclc_pcm_free_dma_buffers(struct snd_pcm *pcm) | |
286 | { | |
287 | snd_pcm_lib_preallocate_free_for_all(pcm); | |
288 | } | |
289 | ||
290 | static int txx9aclc_pcm_new(struct snd_card *card, struct snd_soc_dai *dai, | |
291 | struct snd_pcm *pcm) | |
292 | { | |
293 | return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, | |
294 | card->dev, 64 * 1024, 4 * 1024 * 1024); | |
295 | } | |
296 | ||
297 | static bool filter(struct dma_chan *chan, void *param) | |
298 | { | |
299 | struct txx9aclc_dmadata *dmadata = param; | |
ef394126 | 300 | char devname[20 + 2]; /* FIXME: old BUS_ID_SIZE + 2 */ |
e24805dd | 301 | |
ef394126 | 302 | snprintf(devname, sizeof(devname), "%s.%d", dmadata->dma_res->name, |
e24805dd AN |
303 | (int)dmadata->dma_res->start); |
304 | if (strcmp(dev_name(chan->device->dev), devname) == 0) { | |
305 | chan->private = &dmadata->dma_slave; | |
306 | return true; | |
307 | } | |
308 | return false; | |
309 | } | |
310 | ||
311 | static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev, | |
312 | struct txx9aclc_dmadata *dmadata) | |
313 | { | |
314 | struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev); | |
315 | struct txx9dmac_slave *ds = &dmadata->dma_slave; | |
316 | dma_cap_mask_t mask; | |
317 | ||
318 | spin_lock_init(&dmadata->dma_lock); | |
319 | ||
320 | ds->reg_width = sizeof(u32); | |
321 | if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
322 | ds->tx_reg = drvdata->physbase + ACAUDODAT; | |
323 | ds->rx_reg = 0; | |
324 | } else { | |
325 | ds->tx_reg = 0; | |
326 | ds->rx_reg = drvdata->physbase + ACAUDIDAT; | |
327 | } | |
328 | ||
329 | /* Try to grab a DMA channel */ | |
330 | dma_cap_zero(mask); | |
331 | dma_cap_set(DMA_SLAVE, mask); | |
332 | dmadata->dma_chan = dma_request_channel(mask, filter, dmadata); | |
333 | if (!dmadata->dma_chan) { | |
334 | dev_err(dev->soc_dev.dev, | |
335 | "DMA channel for %s is not available\n", | |
336 | dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ? | |
337 | "playback" : "capture"); | |
338 | return -EBUSY; | |
339 | } | |
340 | tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet, | |
341 | (unsigned long)dmadata); | |
342 | return 0; | |
343 | } | |
344 | ||
345 | static int txx9aclc_pcm_probe(struct platform_device *pdev) | |
346 | { | |
347 | struct snd_soc_device *socdev = platform_get_drvdata(pdev); | |
348 | struct txx9aclc_soc_device *dev = | |
349 | container_of(socdev, struct txx9aclc_soc_device, soc_dev); | |
350 | struct resource *r; | |
351 | int i; | |
352 | int ret; | |
353 | ||
354 | dev->dmadata[0].stream = SNDRV_PCM_STREAM_PLAYBACK; | |
355 | dev->dmadata[1].stream = SNDRV_PCM_STREAM_CAPTURE; | |
356 | for (i = 0; i < 2; i++) { | |
357 | r = platform_get_resource(dev->aclc_pdev, IORESOURCE_DMA, i); | |
358 | if (!r) { | |
359 | ret = -EBUSY; | |
360 | goto exit; | |
361 | } | |
362 | dev->dmadata[i].dma_res = r; | |
363 | ret = txx9aclc_dma_init(dev, &dev->dmadata[i]); | |
364 | if (ret) | |
365 | goto exit; | |
366 | } | |
367 | return 0; | |
368 | ||
369 | exit: | |
370 | for (i = 0; i < 2; i++) { | |
371 | if (dev->dmadata[i].dma_chan) | |
372 | dma_release_channel(dev->dmadata[i].dma_chan); | |
373 | dev->dmadata[i].dma_chan = NULL; | |
374 | } | |
375 | return ret; | |
376 | } | |
377 | ||
378 | static int txx9aclc_pcm_remove(struct platform_device *pdev) | |
379 | { | |
380 | struct snd_soc_device *socdev = platform_get_drvdata(pdev); | |
381 | struct txx9aclc_soc_device *dev = | |
382 | container_of(socdev, struct txx9aclc_soc_device, soc_dev); | |
383 | struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev); | |
384 | void __iomem *base = drvdata->base; | |
385 | int i; | |
386 | ||
387 | /* disable all FIFO DMAs */ | |
388 | __raw_writel(ACCTL_AUDODMA | ACCTL_AUDIDMA, base + ACCTLDIS); | |
389 | /* dummy R/W to clear pending DMAREQ if any */ | |
390 | __raw_writel(__raw_readl(base + ACAUDIDAT), base + ACAUDODAT); | |
391 | ||
392 | for (i = 0; i < 2; i++) { | |
393 | struct txx9aclc_dmadata *dmadata = &dev->dmadata[i]; | |
394 | struct dma_chan *chan = dmadata->dma_chan; | |
395 | if (chan) { | |
396 | dmadata->frag_count = -1; | |
397 | chan->device->device_terminate_all(chan); | |
398 | dma_release_channel(chan); | |
399 | } | |
400 | dev->dmadata[i].dma_chan = NULL; | |
401 | } | |
402 | return 0; | |
403 | } | |
404 | ||
405 | struct snd_soc_platform txx9aclc_soc_platform = { | |
406 | .name = "txx9aclc-audio", | |
407 | .probe = txx9aclc_pcm_probe, | |
408 | .remove = txx9aclc_pcm_remove, | |
409 | .pcm_ops = &txx9aclc_pcm_ops, | |
410 | .pcm_new = txx9aclc_pcm_new, | |
411 | .pcm_free = txx9aclc_pcm_free_dma_buffers, | |
412 | }; | |
413 | EXPORT_SYMBOL_GPL(txx9aclc_soc_platform); | |
414 | ||
415 | static int __init txx9aclc_soc_platform_init(void) | |
416 | { | |
417 | return snd_soc_register_platform(&txx9aclc_soc_platform); | |
418 | } | |
419 | ||
420 | static void __exit txx9aclc_soc_platform_exit(void) | |
421 | { | |
422 | snd_soc_unregister_platform(&txx9aclc_soc_platform); | |
423 | } | |
424 | ||
425 | module_init(txx9aclc_soc_platform_init); | |
426 | module_exit(txx9aclc_soc_platform_exit); | |
427 | ||
428 | MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>"); | |
429 | MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver"); | |
430 | MODULE_LICENSE("GPL"); |