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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> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
e24805dd AN |
19 | #include <sound/core.h> |
20 | #include <sound/pcm.h> | |
21 | #include <sound/pcm_params.h> | |
22 | #include <sound/soc.h> | |
23 | #include "txx9aclc.h" | |
24 | ||
25 | static const struct snd_pcm_hardware txx9aclc_pcm_hardware = { | |
26 | /* | |
27 | * REVISIT: SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | |
28 | * needs more works for noncoherent MIPS. | |
29 | */ | |
30 | .info = SNDRV_PCM_INFO_INTERLEAVED | | |
31 | SNDRV_PCM_INFO_BATCH | | |
32 | SNDRV_PCM_INFO_PAUSE, | |
33 | #ifdef __BIG_ENDIAN | |
34 | .formats = SNDRV_PCM_FMTBIT_S16_BE, | |
35 | #else | |
36 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
37 | #endif | |
38 | .period_bytes_min = 1024, | |
39 | .period_bytes_max = 8 * 1024, | |
40 | .periods_min = 2, | |
41 | .periods_max = 4096, | |
42 | .buffer_bytes_max = 32 * 1024, | |
43 | }; | |
44 | ||
45 | static int txx9aclc_pcm_hw_params(struct snd_pcm_substream *substream, | |
46 | struct snd_pcm_hw_params *params) | |
47 | { | |
48 | struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream); | |
49 | struct snd_soc_device *socdev = rtd->socdev; | |
50 | struct snd_pcm_runtime *runtime = substream->runtime; | |
51 | struct txx9aclc_dmadata *dmadata = runtime->private_data; | |
52 | int ret; | |
53 | ||
54 | ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params)); | |
55 | if (ret < 0) | |
56 | return ret; | |
57 | ||
58 | dev_dbg(socdev->dev, | |
59 | "runtime->dma_area = %#lx dma_addr = %#lx dma_bytes = %zd " | |
60 | "runtime->min_align %ld\n", | |
61 | (unsigned long)runtime->dma_area, | |
62 | (unsigned long)runtime->dma_addr, runtime->dma_bytes, | |
63 | runtime->min_align); | |
64 | dev_dbg(socdev->dev, | |
65 | "periods %d period_bytes %d stream %d\n", | |
66 | params_periods(params), params_period_bytes(params), | |
67 | substream->stream); | |
68 | ||
69 | dmadata->substream = substream; | |
70 | dmadata->pos = 0; | |
71 | return 0; | |
72 | } | |
73 | ||
74 | static int txx9aclc_pcm_hw_free(struct snd_pcm_substream *substream) | |
75 | { | |
76 | return snd_pcm_lib_free_pages(substream); | |
77 | } | |
78 | ||
79 | static int txx9aclc_pcm_prepare(struct snd_pcm_substream *substream) | |
80 | { | |
81 | struct snd_pcm_runtime *runtime = substream->runtime; | |
82 | struct txx9aclc_dmadata *dmadata = runtime->private_data; | |
83 | ||
84 | dmadata->dma_addr = runtime->dma_addr; | |
85 | dmadata->buffer_bytes = snd_pcm_lib_buffer_bytes(substream); | |
86 | dmadata->period_bytes = snd_pcm_lib_period_bytes(substream); | |
87 | ||
88 | if (dmadata->buffer_bytes == dmadata->period_bytes) { | |
89 | dmadata->frag_bytes = dmadata->period_bytes >> 1; | |
90 | dmadata->frags = 2; | |
91 | } else { | |
92 | dmadata->frag_bytes = dmadata->period_bytes; | |
93 | dmadata->frags = dmadata->buffer_bytes / dmadata->period_bytes; | |
94 | } | |
95 | dmadata->frag_count = 0; | |
96 | dmadata->pos = 0; | |
97 | return 0; | |
98 | } | |
99 | ||
100 | static void txx9aclc_dma_complete(void *arg) | |
101 | { | |
102 | struct txx9aclc_dmadata *dmadata = arg; | |
103 | unsigned long flags; | |
104 | ||
105 | /* dma completion handler cannot submit new operations */ | |
106 | spin_lock_irqsave(&dmadata->dma_lock, flags); | |
107 | if (dmadata->frag_count >= 0) { | |
108 | dmadata->dmacount--; | |
109 | BUG_ON(dmadata->dmacount < 0); | |
110 | tasklet_schedule(&dmadata->tasklet); | |
111 | } | |
112 | spin_unlock_irqrestore(&dmadata->dma_lock, flags); | |
113 | } | |
114 | ||
115 | static struct dma_async_tx_descriptor * | |
116 | txx9aclc_dma_submit(struct txx9aclc_dmadata *dmadata, dma_addr_t buf_dma_addr) | |
117 | { | |
118 | struct dma_chan *chan = dmadata->dma_chan; | |
119 | struct dma_async_tx_descriptor *desc; | |
120 | struct scatterlist sg; | |
121 | ||
122 | sg_init_table(&sg, 1); | |
123 | sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf_dma_addr)), | |
124 | dmadata->frag_bytes, buf_dma_addr & (PAGE_SIZE - 1)); | |
125 | sg_dma_address(&sg) = buf_dma_addr; | |
126 | desc = chan->device->device_prep_slave_sg(chan, &sg, 1, | |
127 | dmadata->substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? | |
128 | DMA_TO_DEVICE : DMA_FROM_DEVICE, | |
129 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
130 | if (!desc) { | |
131 | dev_err(&chan->dev->device, "cannot prepare slave dma\n"); | |
132 | return NULL; | |
133 | } | |
134 | desc->callback = txx9aclc_dma_complete; | |
135 | desc->callback_param = dmadata; | |
136 | desc->tx_submit(desc); | |
137 | return desc; | |
138 | } | |
139 | ||
140 | #define NR_DMA_CHAIN 2 | |
141 | ||
142 | static void txx9aclc_dma_tasklet(unsigned long data) | |
143 | { | |
144 | struct txx9aclc_dmadata *dmadata = (struct txx9aclc_dmadata *)data; | |
145 | struct dma_chan *chan = dmadata->dma_chan; | |
146 | struct dma_async_tx_descriptor *desc; | |
147 | struct snd_pcm_substream *substream = dmadata->substream; | |
148 | u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? | |
149 | ACCTL_AUDODMA : ACCTL_AUDIDMA; | |
150 | int i; | |
151 | unsigned long flags; | |
152 | ||
153 | spin_lock_irqsave(&dmadata->dma_lock, flags); | |
154 | if (dmadata->frag_count < 0) { | |
155 | struct txx9aclc_soc_device *dev = | |
156 | container_of(dmadata, struct txx9aclc_soc_device, | |
157 | dmadata[substream->stream]); | |
158 | struct txx9aclc_plat_drvdata *drvdata = | |
159 | txx9aclc_get_plat_drvdata(dev); | |
160 | void __iomem *base = drvdata->base; | |
161 | ||
162 | spin_unlock_irqrestore(&dmadata->dma_lock, flags); | |
163 | chan->device->device_terminate_all(chan); | |
164 | /* first time */ | |
165 | for (i = 0; i < NR_DMA_CHAIN; i++) { | |
166 | desc = txx9aclc_dma_submit(dmadata, | |
167 | dmadata->dma_addr + i * dmadata->frag_bytes); | |
168 | if (!desc) | |
169 | return; | |
170 | } | |
171 | dmadata->dmacount = NR_DMA_CHAIN; | |
172 | chan->device->device_issue_pending(chan); | |
173 | spin_lock_irqsave(&dmadata->dma_lock, flags); | |
174 | __raw_writel(ctlbit, base + ACCTLEN); | |
175 | dmadata->frag_count = NR_DMA_CHAIN % dmadata->frags; | |
176 | spin_unlock_irqrestore(&dmadata->dma_lock, flags); | |
177 | return; | |
178 | } | |
179 | BUG_ON(dmadata->dmacount >= NR_DMA_CHAIN); | |
180 | while (dmadata->dmacount < NR_DMA_CHAIN) { | |
181 | dmadata->dmacount++; | |
182 | spin_unlock_irqrestore(&dmadata->dma_lock, flags); | |
183 | desc = txx9aclc_dma_submit(dmadata, | |
184 | dmadata->dma_addr + | |
185 | dmadata->frag_count * dmadata->frag_bytes); | |
186 | if (!desc) | |
187 | return; | |
188 | chan->device->device_issue_pending(chan); | |
189 | ||
190 | spin_lock_irqsave(&dmadata->dma_lock, flags); | |
191 | dmadata->frag_count++; | |
192 | dmadata->frag_count %= dmadata->frags; | |
193 | dmadata->pos += dmadata->frag_bytes; | |
194 | dmadata->pos %= dmadata->buffer_bytes; | |
195 | if ((dmadata->frag_count * dmadata->frag_bytes) % | |
196 | dmadata->period_bytes == 0) | |
197 | snd_pcm_period_elapsed(substream); | |
198 | } | |
199 | spin_unlock_irqrestore(&dmadata->dma_lock, flags); | |
200 | } | |
201 | ||
202 | static int txx9aclc_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
203 | { | |
204 | struct txx9aclc_dmadata *dmadata = substream->runtime->private_data; | |
205 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
206 | struct txx9aclc_soc_device *dev = | |
207 | container_of(rtd->socdev, struct txx9aclc_soc_device, soc_dev); | |
208 | struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev); | |
209 | void __iomem *base = drvdata->base; | |
210 | unsigned long flags; | |
211 | int ret = 0; | |
212 | u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? | |
213 | ACCTL_AUDODMA : ACCTL_AUDIDMA; | |
214 | ||
215 | spin_lock_irqsave(&dmadata->dma_lock, flags); | |
216 | switch (cmd) { | |
217 | case SNDRV_PCM_TRIGGER_START: | |
218 | dmadata->frag_count = -1; | |
219 | tasklet_schedule(&dmadata->tasklet); | |
220 | break; | |
221 | case SNDRV_PCM_TRIGGER_STOP: | |
222 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
223 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
224 | __raw_writel(ctlbit, base + ACCTLDIS); | |
225 | break; | |
226 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
227 | case SNDRV_PCM_TRIGGER_RESUME: | |
228 | __raw_writel(ctlbit, base + ACCTLEN); | |
229 | break; | |
230 | default: | |
231 | ret = -EINVAL; | |
232 | } | |
233 | spin_unlock_irqrestore(&dmadata->dma_lock, flags); | |
234 | return ret; | |
235 | } | |
236 | ||
237 | static snd_pcm_uframes_t | |
238 | txx9aclc_pcm_pointer(struct snd_pcm_substream *substream) | |
239 | { | |
240 | struct txx9aclc_dmadata *dmadata = substream->runtime->private_data; | |
241 | ||
242 | return bytes_to_frames(substream->runtime, dmadata->pos); | |
243 | } | |
244 | ||
245 | static int txx9aclc_pcm_open(struct snd_pcm_substream *substream) | |
246 | { | |
247 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
248 | struct txx9aclc_soc_device *dev = | |
249 | container_of(rtd->socdev, struct txx9aclc_soc_device, soc_dev); | |
250 | struct txx9aclc_dmadata *dmadata = &dev->dmadata[substream->stream]; | |
251 | int ret; | |
252 | ||
253 | ret = snd_soc_set_runtime_hwparams(substream, &txx9aclc_pcm_hardware); | |
254 | if (ret) | |
255 | return ret; | |
256 | /* ensure that buffer size is a multiple of period size */ | |
257 | ret = snd_pcm_hw_constraint_integer(substream->runtime, | |
258 | SNDRV_PCM_HW_PARAM_PERIODS); | |
259 | if (ret < 0) | |
260 | return ret; | |
261 | substream->runtime->private_data = dmadata; | |
262 | return 0; | |
263 | } | |
264 | ||
265 | static int txx9aclc_pcm_close(struct snd_pcm_substream *substream) | |
266 | { | |
267 | struct txx9aclc_dmadata *dmadata = substream->runtime->private_data; | |
268 | struct dma_chan *chan = dmadata->dma_chan; | |
269 | ||
270 | dmadata->frag_count = -1; | |
271 | chan->device->device_terminate_all(chan); | |
272 | return 0; | |
273 | } | |
274 | ||
275 | static struct snd_pcm_ops txx9aclc_pcm_ops = { | |
276 | .open = txx9aclc_pcm_open, | |
277 | .close = txx9aclc_pcm_close, | |
278 | .ioctl = snd_pcm_lib_ioctl, | |
279 | .hw_params = txx9aclc_pcm_hw_params, | |
280 | .hw_free = txx9aclc_pcm_hw_free, | |
281 | .prepare = txx9aclc_pcm_prepare, | |
282 | .trigger = txx9aclc_pcm_trigger, | |
283 | .pointer = txx9aclc_pcm_pointer, | |
284 | }; | |
285 | ||
286 | static void txx9aclc_pcm_free_dma_buffers(struct snd_pcm *pcm) | |
287 | { | |
288 | snd_pcm_lib_preallocate_free_for_all(pcm); | |
289 | } | |
290 | ||
291 | static int txx9aclc_pcm_new(struct snd_card *card, struct snd_soc_dai *dai, | |
292 | struct snd_pcm *pcm) | |
293 | { | |
294 | return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, | |
295 | card->dev, 64 * 1024, 4 * 1024 * 1024); | |
296 | } | |
297 | ||
298 | static bool filter(struct dma_chan *chan, void *param) | |
299 | { | |
300 | struct txx9aclc_dmadata *dmadata = param; | |
647613e9 AN |
301 | char *devname; |
302 | bool found = false; | |
e24805dd | 303 | |
647613e9 | 304 | devname = kasprintf(GFP_KERNEL, "%s.%d", dmadata->dma_res->name, |
e24805dd AN |
305 | (int)dmadata->dma_res->start); |
306 | if (strcmp(dev_name(chan->device->dev), devname) == 0) { | |
307 | chan->private = &dmadata->dma_slave; | |
647613e9 | 308 | found = true; |
e24805dd | 309 | } |
647613e9 AN |
310 | kfree(devname); |
311 | return found; | |
e24805dd AN |
312 | } |
313 | ||
314 | static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev, | |
315 | struct txx9aclc_dmadata *dmadata) | |
316 | { | |
317 | struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev); | |
318 | struct txx9dmac_slave *ds = &dmadata->dma_slave; | |
319 | dma_cap_mask_t mask; | |
320 | ||
321 | spin_lock_init(&dmadata->dma_lock); | |
322 | ||
323 | ds->reg_width = sizeof(u32); | |
324 | if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
325 | ds->tx_reg = drvdata->physbase + ACAUDODAT; | |
326 | ds->rx_reg = 0; | |
327 | } else { | |
328 | ds->tx_reg = 0; | |
329 | ds->rx_reg = drvdata->physbase + ACAUDIDAT; | |
330 | } | |
331 | ||
332 | /* Try to grab a DMA channel */ | |
333 | dma_cap_zero(mask); | |
334 | dma_cap_set(DMA_SLAVE, mask); | |
335 | dmadata->dma_chan = dma_request_channel(mask, filter, dmadata); | |
336 | if (!dmadata->dma_chan) { | |
337 | dev_err(dev->soc_dev.dev, | |
338 | "DMA channel for %s is not available\n", | |
339 | dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ? | |
340 | "playback" : "capture"); | |
341 | return -EBUSY; | |
342 | } | |
343 | tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet, | |
344 | (unsigned long)dmadata); | |
345 | return 0; | |
346 | } | |
347 | ||
348 | static int txx9aclc_pcm_probe(struct platform_device *pdev) | |
349 | { | |
350 | struct snd_soc_device *socdev = platform_get_drvdata(pdev); | |
351 | struct txx9aclc_soc_device *dev = | |
352 | container_of(socdev, struct txx9aclc_soc_device, soc_dev); | |
353 | struct resource *r; | |
354 | int i; | |
355 | int ret; | |
356 | ||
357 | dev->dmadata[0].stream = SNDRV_PCM_STREAM_PLAYBACK; | |
358 | dev->dmadata[1].stream = SNDRV_PCM_STREAM_CAPTURE; | |
359 | for (i = 0; i < 2; i++) { | |
360 | r = platform_get_resource(dev->aclc_pdev, IORESOURCE_DMA, i); | |
361 | if (!r) { | |
362 | ret = -EBUSY; | |
363 | goto exit; | |
364 | } | |
365 | dev->dmadata[i].dma_res = r; | |
366 | ret = txx9aclc_dma_init(dev, &dev->dmadata[i]); | |
367 | if (ret) | |
368 | goto exit; | |
369 | } | |
370 | return 0; | |
371 | ||
372 | exit: | |
373 | for (i = 0; i < 2; i++) { | |
374 | if (dev->dmadata[i].dma_chan) | |
375 | dma_release_channel(dev->dmadata[i].dma_chan); | |
376 | dev->dmadata[i].dma_chan = NULL; | |
377 | } | |
378 | return ret; | |
379 | } | |
380 | ||
381 | static int txx9aclc_pcm_remove(struct platform_device *pdev) | |
382 | { | |
383 | struct snd_soc_device *socdev = platform_get_drvdata(pdev); | |
384 | struct txx9aclc_soc_device *dev = | |
385 | container_of(socdev, struct txx9aclc_soc_device, soc_dev); | |
386 | struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev); | |
387 | void __iomem *base = drvdata->base; | |
388 | int i; | |
389 | ||
390 | /* disable all FIFO DMAs */ | |
391 | __raw_writel(ACCTL_AUDODMA | ACCTL_AUDIDMA, base + ACCTLDIS); | |
392 | /* dummy R/W to clear pending DMAREQ if any */ | |
393 | __raw_writel(__raw_readl(base + ACAUDIDAT), base + ACAUDODAT); | |
394 | ||
395 | for (i = 0; i < 2; i++) { | |
396 | struct txx9aclc_dmadata *dmadata = &dev->dmadata[i]; | |
397 | struct dma_chan *chan = dmadata->dma_chan; | |
398 | if (chan) { | |
399 | dmadata->frag_count = -1; | |
400 | chan->device->device_terminate_all(chan); | |
401 | dma_release_channel(chan); | |
402 | } | |
403 | dev->dmadata[i].dma_chan = NULL; | |
404 | } | |
405 | return 0; | |
406 | } | |
407 | ||
408 | struct snd_soc_platform txx9aclc_soc_platform = { | |
409 | .name = "txx9aclc-audio", | |
410 | .probe = txx9aclc_pcm_probe, | |
411 | .remove = txx9aclc_pcm_remove, | |
412 | .pcm_ops = &txx9aclc_pcm_ops, | |
413 | .pcm_new = txx9aclc_pcm_new, | |
414 | .pcm_free = txx9aclc_pcm_free_dma_buffers, | |
415 | }; | |
416 | EXPORT_SYMBOL_GPL(txx9aclc_soc_platform); | |
417 | ||
418 | static int __init txx9aclc_soc_platform_init(void) | |
419 | { | |
420 | return snd_soc_register_platform(&txx9aclc_soc_platform); | |
421 | } | |
422 | ||
423 | static void __exit txx9aclc_soc_platform_exit(void) | |
424 | { | |
425 | snd_soc_unregister_platform(&txx9aclc_soc_platform); | |
426 | } | |
427 | ||
428 | module_init(txx9aclc_soc_platform_init); | |
429 | module_exit(txx9aclc_soc_platform_exit); | |
430 | ||
431 | MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>"); | |
432 | MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver"); | |
433 | MODULE_LICENSE("GPL"); |