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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 | ||
f0fba2ad LG |
25 | static struct txx9aclc_soc_device { |
26 | struct txx9aclc_dmadata dmadata[2]; | |
27 | } txx9aclc_soc_device; | |
28 | ||
29 | /* REVISIT: How to find txx9aclc_drvdata from snd_ac97? */ | |
30 | static struct txx9aclc_plat_drvdata *txx9aclc_drvdata; | |
31 | ||
32 | static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev, | |
33 | struct txx9aclc_dmadata *dmadata); | |
34 | ||
e24805dd AN |
35 | static const struct snd_pcm_hardware txx9aclc_pcm_hardware = { |
36 | /* | |
37 | * REVISIT: SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | |
38 | * needs more works for noncoherent MIPS. | |
39 | */ | |
40 | .info = SNDRV_PCM_INFO_INTERLEAVED | | |
41 | SNDRV_PCM_INFO_BATCH | | |
42 | SNDRV_PCM_INFO_PAUSE, | |
43 | #ifdef __BIG_ENDIAN | |
44 | .formats = SNDRV_PCM_FMTBIT_S16_BE, | |
45 | #else | |
46 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
47 | #endif | |
48 | .period_bytes_min = 1024, | |
49 | .period_bytes_max = 8 * 1024, | |
50 | .periods_min = 2, | |
51 | .periods_max = 4096, | |
52 | .buffer_bytes_max = 32 * 1024, | |
53 | }; | |
54 | ||
55 | static int txx9aclc_pcm_hw_params(struct snd_pcm_substream *substream, | |
56 | struct snd_pcm_hw_params *params) | |
57 | { | |
58 | struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream); | |
e24805dd AN |
59 | struct snd_pcm_runtime *runtime = substream->runtime; |
60 | struct txx9aclc_dmadata *dmadata = runtime->private_data; | |
61 | int ret; | |
62 | ||
63 | ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params)); | |
64 | if (ret < 0) | |
65 | return ret; | |
66 | ||
f0fba2ad | 67 | dev_dbg(rtd->platform->dev, |
e24805dd AN |
68 | "runtime->dma_area = %#lx dma_addr = %#lx dma_bytes = %zd " |
69 | "runtime->min_align %ld\n", | |
70 | (unsigned long)runtime->dma_area, | |
71 | (unsigned long)runtime->dma_addr, runtime->dma_bytes, | |
72 | runtime->min_align); | |
f0fba2ad | 73 | dev_dbg(rtd->platform->dev, |
e24805dd AN |
74 | "periods %d period_bytes %d stream %d\n", |
75 | params_periods(params), params_period_bytes(params), | |
76 | substream->stream); | |
77 | ||
78 | dmadata->substream = substream; | |
79 | dmadata->pos = 0; | |
80 | return 0; | |
81 | } | |
82 | ||
83 | static int txx9aclc_pcm_hw_free(struct snd_pcm_substream *substream) | |
84 | { | |
85 | return snd_pcm_lib_free_pages(substream); | |
86 | } | |
87 | ||
88 | static int txx9aclc_pcm_prepare(struct snd_pcm_substream *substream) | |
89 | { | |
90 | struct snd_pcm_runtime *runtime = substream->runtime; | |
91 | struct txx9aclc_dmadata *dmadata = runtime->private_data; | |
92 | ||
93 | dmadata->dma_addr = runtime->dma_addr; | |
94 | dmadata->buffer_bytes = snd_pcm_lib_buffer_bytes(substream); | |
95 | dmadata->period_bytes = snd_pcm_lib_period_bytes(substream); | |
96 | ||
97 | if (dmadata->buffer_bytes == dmadata->period_bytes) { | |
98 | dmadata->frag_bytes = dmadata->period_bytes >> 1; | |
99 | dmadata->frags = 2; | |
100 | } else { | |
101 | dmadata->frag_bytes = dmadata->period_bytes; | |
102 | dmadata->frags = dmadata->buffer_bytes / dmadata->period_bytes; | |
103 | } | |
104 | dmadata->frag_count = 0; | |
105 | dmadata->pos = 0; | |
106 | return 0; | |
107 | } | |
108 | ||
109 | static void txx9aclc_dma_complete(void *arg) | |
110 | { | |
111 | struct txx9aclc_dmadata *dmadata = arg; | |
112 | unsigned long flags; | |
113 | ||
114 | /* dma completion handler cannot submit new operations */ | |
115 | spin_lock_irqsave(&dmadata->dma_lock, flags); | |
116 | if (dmadata->frag_count >= 0) { | |
117 | dmadata->dmacount--; | |
118 | BUG_ON(dmadata->dmacount < 0); | |
119 | tasklet_schedule(&dmadata->tasklet); | |
120 | } | |
121 | spin_unlock_irqrestore(&dmadata->dma_lock, flags); | |
122 | } | |
123 | ||
124 | static struct dma_async_tx_descriptor * | |
125 | txx9aclc_dma_submit(struct txx9aclc_dmadata *dmadata, dma_addr_t buf_dma_addr) | |
126 | { | |
127 | struct dma_chan *chan = dmadata->dma_chan; | |
128 | struct dma_async_tx_descriptor *desc; | |
129 | struct scatterlist sg; | |
130 | ||
131 | sg_init_table(&sg, 1); | |
132 | sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf_dma_addr)), | |
133 | dmadata->frag_bytes, buf_dma_addr & (PAGE_SIZE - 1)); | |
134 | sg_dma_address(&sg) = buf_dma_addr; | |
16052827 | 135 | desc = dmaengine_prep_slave_sg(chan, &sg, 1, |
e24805dd | 136 | dmadata->substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? |
35e16581 | 137 | DMA_MEM_TO_DEV : DMA_DEV_TO_MEM, |
e24805dd AN |
138 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
139 | if (!desc) { | |
140 | dev_err(&chan->dev->device, "cannot prepare slave dma\n"); | |
141 | return NULL; | |
142 | } | |
143 | desc->callback = txx9aclc_dma_complete; | |
144 | desc->callback_param = dmadata; | |
145 | desc->tx_submit(desc); | |
146 | return desc; | |
147 | } | |
148 | ||
149 | #define NR_DMA_CHAIN 2 | |
150 | ||
151 | static void txx9aclc_dma_tasklet(unsigned long data) | |
152 | { | |
153 | struct txx9aclc_dmadata *dmadata = (struct txx9aclc_dmadata *)data; | |
154 | struct dma_chan *chan = dmadata->dma_chan; | |
155 | struct dma_async_tx_descriptor *desc; | |
156 | struct snd_pcm_substream *substream = dmadata->substream; | |
157 | u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? | |
158 | ACCTL_AUDODMA : ACCTL_AUDIDMA; | |
159 | int i; | |
160 | unsigned long flags; | |
161 | ||
162 | spin_lock_irqsave(&dmadata->dma_lock, flags); | |
163 | if (dmadata->frag_count < 0) { | |
f0fba2ad | 164 | struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata; |
e24805dd AN |
165 | void __iomem *base = drvdata->base; |
166 | ||
167 | spin_unlock_irqrestore(&dmadata->dma_lock, flags); | |
05827630 | 168 | chan->device->device_control(chan, DMA_TERMINATE_ALL, 0); |
e24805dd AN |
169 | /* first time */ |
170 | for (i = 0; i < NR_DMA_CHAIN; i++) { | |
171 | desc = txx9aclc_dma_submit(dmadata, | |
172 | dmadata->dma_addr + i * dmadata->frag_bytes); | |
173 | if (!desc) | |
174 | return; | |
175 | } | |
176 | dmadata->dmacount = NR_DMA_CHAIN; | |
177 | chan->device->device_issue_pending(chan); | |
178 | spin_lock_irqsave(&dmadata->dma_lock, flags); | |
179 | __raw_writel(ctlbit, base + ACCTLEN); | |
180 | dmadata->frag_count = NR_DMA_CHAIN % dmadata->frags; | |
181 | spin_unlock_irqrestore(&dmadata->dma_lock, flags); | |
182 | return; | |
183 | } | |
184 | BUG_ON(dmadata->dmacount >= NR_DMA_CHAIN); | |
185 | while (dmadata->dmacount < NR_DMA_CHAIN) { | |
186 | dmadata->dmacount++; | |
187 | spin_unlock_irqrestore(&dmadata->dma_lock, flags); | |
188 | desc = txx9aclc_dma_submit(dmadata, | |
189 | dmadata->dma_addr + | |
190 | dmadata->frag_count * dmadata->frag_bytes); | |
191 | if (!desc) | |
192 | return; | |
193 | chan->device->device_issue_pending(chan); | |
194 | ||
195 | spin_lock_irqsave(&dmadata->dma_lock, flags); | |
196 | dmadata->frag_count++; | |
197 | dmadata->frag_count %= dmadata->frags; | |
198 | dmadata->pos += dmadata->frag_bytes; | |
199 | dmadata->pos %= dmadata->buffer_bytes; | |
200 | if ((dmadata->frag_count * dmadata->frag_bytes) % | |
201 | dmadata->period_bytes == 0) | |
202 | snd_pcm_period_elapsed(substream); | |
203 | } | |
204 | spin_unlock_irqrestore(&dmadata->dma_lock, flags); | |
205 | } | |
206 | ||
207 | static int txx9aclc_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
208 | { | |
209 | struct txx9aclc_dmadata *dmadata = substream->runtime->private_data; | |
f0fba2ad | 210 | struct txx9aclc_plat_drvdata *drvdata =txx9aclc_drvdata; |
e24805dd AN |
211 | void __iomem *base = drvdata->base; |
212 | unsigned long flags; | |
213 | int ret = 0; | |
214 | u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? | |
215 | ACCTL_AUDODMA : ACCTL_AUDIDMA; | |
216 | ||
217 | spin_lock_irqsave(&dmadata->dma_lock, flags); | |
218 | switch (cmd) { | |
219 | case SNDRV_PCM_TRIGGER_START: | |
220 | dmadata->frag_count = -1; | |
221 | tasklet_schedule(&dmadata->tasklet); | |
222 | break; | |
223 | case SNDRV_PCM_TRIGGER_STOP: | |
224 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
225 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
226 | __raw_writel(ctlbit, base + ACCTLDIS); | |
227 | break; | |
228 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
229 | case SNDRV_PCM_TRIGGER_RESUME: | |
230 | __raw_writel(ctlbit, base + ACCTLEN); | |
231 | break; | |
232 | default: | |
233 | ret = -EINVAL; | |
234 | } | |
235 | spin_unlock_irqrestore(&dmadata->dma_lock, flags); | |
236 | return ret; | |
237 | } | |
238 | ||
239 | static snd_pcm_uframes_t | |
240 | txx9aclc_pcm_pointer(struct snd_pcm_substream *substream) | |
241 | { | |
242 | struct txx9aclc_dmadata *dmadata = substream->runtime->private_data; | |
243 | ||
244 | return bytes_to_frames(substream->runtime, dmadata->pos); | |
245 | } | |
246 | ||
247 | static int txx9aclc_pcm_open(struct snd_pcm_substream *substream) | |
248 | { | |
f0fba2ad | 249 | struct txx9aclc_soc_device *dev = &txx9aclc_soc_device; |
e24805dd AN |
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; | |
05827630 | 271 | chan->device->device_control(chan, DMA_TERMINATE_ALL, 0); |
e24805dd AN |
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 | ||
552d1ef6 | 291 | static int txx9aclc_pcm_new(struct snd_soc_pcm_runtime *rtd) |
e24805dd | 292 | { |
06132fdf | 293 | struct snd_card *card = rtd->card->snd_card; |
552d1ef6 LG |
294 | struct snd_soc_dai *dai = rtd->cpu_dai; |
295 | struct snd_pcm *pcm = rtd->pcm; | |
f0fba2ad LG |
296 | struct platform_device *pdev = to_platform_device(dai->platform->dev); |
297 | struct txx9aclc_soc_device *dev; | |
298 | struct resource *r; | |
299 | int i; | |
300 | int ret; | |
301 | ||
302 | /* at this point onwards the AC97 component has probed and this will be valid */ | |
303 | dev = snd_soc_dai_get_drvdata(dai); | |
304 | ||
305 | dev->dmadata[0].stream = SNDRV_PCM_STREAM_PLAYBACK; | |
306 | dev->dmadata[1].stream = SNDRV_PCM_STREAM_CAPTURE; | |
307 | for (i = 0; i < 2; i++) { | |
308 | r = platform_get_resource(pdev, IORESOURCE_DMA, i); | |
309 | if (!r) { | |
310 | ret = -EBUSY; | |
311 | goto exit; | |
312 | } | |
313 | dev->dmadata[i].dma_res = r; | |
314 | ret = txx9aclc_dma_init(dev, &dev->dmadata[i]); | |
315 | if (ret) | |
316 | goto exit; | |
317 | } | |
e24805dd AN |
318 | return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, |
319 | card->dev, 64 * 1024, 4 * 1024 * 1024); | |
f0fba2ad LG |
320 | |
321 | exit: | |
322 | for (i = 0; i < 2; i++) { | |
323 | if (dev->dmadata[i].dma_chan) | |
324 | dma_release_channel(dev->dmadata[i].dma_chan); | |
325 | dev->dmadata[i].dma_chan = NULL; | |
326 | } | |
327 | return ret; | |
e24805dd AN |
328 | } |
329 | ||
330 | static bool filter(struct dma_chan *chan, void *param) | |
331 | { | |
332 | struct txx9aclc_dmadata *dmadata = param; | |
647613e9 AN |
333 | char *devname; |
334 | bool found = false; | |
e24805dd | 335 | |
647613e9 | 336 | devname = kasprintf(GFP_KERNEL, "%s.%d", dmadata->dma_res->name, |
e24805dd AN |
337 | (int)dmadata->dma_res->start); |
338 | if (strcmp(dev_name(chan->device->dev), devname) == 0) { | |
339 | chan->private = &dmadata->dma_slave; | |
647613e9 | 340 | found = true; |
e24805dd | 341 | } |
647613e9 AN |
342 | kfree(devname); |
343 | return found; | |
e24805dd AN |
344 | } |
345 | ||
346 | static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev, | |
347 | struct txx9aclc_dmadata *dmadata) | |
348 | { | |
f0fba2ad | 349 | struct txx9aclc_plat_drvdata *drvdata =txx9aclc_drvdata; |
e24805dd AN |
350 | struct txx9dmac_slave *ds = &dmadata->dma_slave; |
351 | dma_cap_mask_t mask; | |
352 | ||
353 | spin_lock_init(&dmadata->dma_lock); | |
354 | ||
355 | ds->reg_width = sizeof(u32); | |
356 | if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
357 | ds->tx_reg = drvdata->physbase + ACAUDODAT; | |
358 | ds->rx_reg = 0; | |
359 | } else { | |
360 | ds->tx_reg = 0; | |
361 | ds->rx_reg = drvdata->physbase + ACAUDIDAT; | |
362 | } | |
363 | ||
364 | /* Try to grab a DMA channel */ | |
365 | dma_cap_zero(mask); | |
366 | dma_cap_set(DMA_SLAVE, mask); | |
367 | dmadata->dma_chan = dma_request_channel(mask, filter, dmadata); | |
368 | if (!dmadata->dma_chan) { | |
f0fba2ad | 369 | printk(KERN_ERR |
e24805dd AN |
370 | "DMA channel for %s is not available\n", |
371 | dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ? | |
372 | "playback" : "capture"); | |
373 | return -EBUSY; | |
374 | } | |
375 | tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet, | |
376 | (unsigned long)dmadata); | |
377 | return 0; | |
378 | } | |
379 | ||
f0fba2ad | 380 | static int txx9aclc_pcm_probe(struct snd_soc_platform *platform) |
e24805dd | 381 | { |
f0fba2ad | 382 | snd_soc_platform_set_drvdata(platform, &txx9aclc_soc_device); |
e24805dd | 383 | return 0; |
e24805dd AN |
384 | } |
385 | ||
f0fba2ad | 386 | static int txx9aclc_pcm_remove(struct snd_soc_platform *platform) |
e24805dd | 387 | { |
f0fba2ad LG |
388 | struct txx9aclc_soc_device *dev = snd_soc_platform_get_drvdata(platform); |
389 | struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata; | |
e24805dd AN |
390 | void __iomem *base = drvdata->base; |
391 | int i; | |
392 | ||
393 | /* disable all FIFO DMAs */ | |
394 | __raw_writel(ACCTL_AUDODMA | ACCTL_AUDIDMA, base + ACCTLDIS); | |
395 | /* dummy R/W to clear pending DMAREQ if any */ | |
396 | __raw_writel(__raw_readl(base + ACAUDIDAT), base + ACAUDODAT); | |
397 | ||
398 | for (i = 0; i < 2; i++) { | |
399 | struct txx9aclc_dmadata *dmadata = &dev->dmadata[i]; | |
400 | struct dma_chan *chan = dmadata->dma_chan; | |
401 | if (chan) { | |
402 | dmadata->frag_count = -1; | |
05827630 LW |
403 | chan->device->device_control(chan, |
404 | DMA_TERMINATE_ALL, 0); | |
e24805dd AN |
405 | dma_release_channel(chan); |
406 | } | |
407 | dev->dmadata[i].dma_chan = NULL; | |
408 | } | |
409 | return 0; | |
410 | } | |
411 | ||
f0fba2ad | 412 | static struct snd_soc_platform_driver txx9aclc_soc_platform = { |
e24805dd AN |
413 | .probe = txx9aclc_pcm_probe, |
414 | .remove = txx9aclc_pcm_remove, | |
f0fba2ad | 415 | .ops = &txx9aclc_pcm_ops, |
e24805dd AN |
416 | .pcm_new = txx9aclc_pcm_new, |
417 | .pcm_free = txx9aclc_pcm_free_dma_buffers, | |
418 | }; | |
e24805dd | 419 | |
f0fba2ad | 420 | static int __devinit txx9aclc_soc_platform_probe(struct platform_device *pdev) |
e24805dd | 421 | { |
f0fba2ad | 422 | return snd_soc_register_platform(&pdev->dev, &txx9aclc_soc_platform); |
e24805dd AN |
423 | } |
424 | ||
f0fba2ad | 425 | static int __devexit txx9aclc_soc_platform_remove(struct platform_device *pdev) |
e24805dd | 426 | { |
f0fba2ad LG |
427 | snd_soc_unregister_platform(&pdev->dev); |
428 | return 0; | |
e24805dd AN |
429 | } |
430 | ||
f0fba2ad LG |
431 | static struct platform_driver txx9aclc_pcm_driver = { |
432 | .driver = { | |
433 | .name = "txx9aclc-pcm-audio", | |
434 | .owner = THIS_MODULE, | |
435 | }, | |
436 | ||
437 | .probe = txx9aclc_soc_platform_probe, | |
438 | .remove = __devexit_p(txx9aclc_soc_platform_remove), | |
439 | }; | |
440 | ||
33d316cd | 441 | module_platform_driver(txx9aclc_pcm_driver); |
e24805dd AN |
442 | |
443 | MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>"); | |
444 | MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver"); | |
445 | MODULE_LICENSE("GPL"); |