2 * Generic TXx9 ACLC platform driver
4 * Copyright (C) 2009 Atsushi Nemoto
6 * Based on RBTX49xx patch from CELF patch archive.
7 * (C) Copyright TOSHIBA CORPORATION 2004-2006
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.
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/platform_device.h>
17 #include <linux/scatterlist.h>
18 #include <linux/slab.h>
19 #include <linux/dmaengine.h>
20 #include <sound/core.h>
21 #include <sound/pcm.h>
22 #include <sound/pcm_params.h>
23 #include <sound/soc.h>
26 static struct txx9aclc_soc_device {
27 struct txx9aclc_dmadata dmadata[2];
28 } txx9aclc_soc_device;
30 /* REVISIT: How to find txx9aclc_drvdata from snd_ac97? */
31 static struct txx9aclc_plat_drvdata *txx9aclc_drvdata;
33 static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
34 struct txx9aclc_dmadata *dmadata);
36 static const struct snd_pcm_hardware txx9aclc_pcm_hardware = {
38 * REVISIT: SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
39 * needs more works for noncoherent MIPS.
41 .info = SNDRV_PCM_INFO_INTERLEAVED |
42 SNDRV_PCM_INFO_BATCH |
44 .period_bytes_min = 1024,
45 .period_bytes_max = 8 * 1024,
48 .buffer_bytes_max = 32 * 1024,
51 static int txx9aclc_pcm_hw_params(struct snd_pcm_substream *substream,
52 struct snd_pcm_hw_params *params)
54 struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
55 struct snd_pcm_runtime *runtime = substream->runtime;
56 struct txx9aclc_dmadata *dmadata = runtime->private_data;
59 ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
63 dev_dbg(rtd->platform->dev,
64 "runtime->dma_area = %#lx dma_addr = %#lx dma_bytes = %zd "
65 "runtime->min_align %ld\n",
66 (unsigned long)runtime->dma_area,
67 (unsigned long)runtime->dma_addr, runtime->dma_bytes,
69 dev_dbg(rtd->platform->dev,
70 "periods %d period_bytes %d stream %d\n",
71 params_periods(params), params_period_bytes(params),
74 dmadata->substream = substream;
79 static int txx9aclc_pcm_hw_free(struct snd_pcm_substream *substream)
81 return snd_pcm_lib_free_pages(substream);
84 static int txx9aclc_pcm_prepare(struct snd_pcm_substream *substream)
86 struct snd_pcm_runtime *runtime = substream->runtime;
87 struct txx9aclc_dmadata *dmadata = runtime->private_data;
89 dmadata->dma_addr = runtime->dma_addr;
90 dmadata->buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
91 dmadata->period_bytes = snd_pcm_lib_period_bytes(substream);
93 if (dmadata->buffer_bytes == dmadata->period_bytes) {
94 dmadata->frag_bytes = dmadata->period_bytes >> 1;
97 dmadata->frag_bytes = dmadata->period_bytes;
98 dmadata->frags = dmadata->buffer_bytes / dmadata->period_bytes;
100 dmadata->frag_count = 0;
105 static void txx9aclc_dma_complete(void *arg)
107 struct txx9aclc_dmadata *dmadata = arg;
110 /* dma completion handler cannot submit new operations */
111 spin_lock_irqsave(&dmadata->dma_lock, flags);
112 if (dmadata->frag_count >= 0) {
114 if (!WARN_ON(dmadata->dmacount < 0))
115 tasklet_schedule(&dmadata->tasklet);
117 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
120 static struct dma_async_tx_descriptor *
121 txx9aclc_dma_submit(struct txx9aclc_dmadata *dmadata, dma_addr_t buf_dma_addr)
123 struct dma_chan *chan = dmadata->dma_chan;
124 struct dma_async_tx_descriptor *desc;
125 struct scatterlist sg;
127 sg_init_table(&sg, 1);
128 sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf_dma_addr)),
129 dmadata->frag_bytes, buf_dma_addr & (PAGE_SIZE - 1));
130 sg_dma_address(&sg) = buf_dma_addr;
131 desc = dmaengine_prep_slave_sg(chan, &sg, 1,
132 dmadata->substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
133 DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
134 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
136 dev_err(&chan->dev->device, "cannot prepare slave dma\n");
139 desc->callback = txx9aclc_dma_complete;
140 desc->callback_param = dmadata;
141 dmaengine_submit(desc);
145 #define NR_DMA_CHAIN 2
147 static void txx9aclc_dma_tasklet(unsigned long data)
149 struct txx9aclc_dmadata *dmadata = (struct txx9aclc_dmadata *)data;
150 struct dma_chan *chan = dmadata->dma_chan;
151 struct dma_async_tx_descriptor *desc;
152 struct snd_pcm_substream *substream = dmadata->substream;
153 u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
154 ACCTL_AUDODMA : ACCTL_AUDIDMA;
158 spin_lock_irqsave(&dmadata->dma_lock, flags);
159 if (dmadata->frag_count < 0) {
160 struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
161 void __iomem *base = drvdata->base;
163 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
164 dmaengine_terminate_all(chan);
166 for (i = 0; i < NR_DMA_CHAIN; i++) {
167 desc = txx9aclc_dma_submit(dmadata,
168 dmadata->dma_addr + i * dmadata->frag_bytes);
172 dmadata->dmacount = NR_DMA_CHAIN;
173 dma_async_issue_pending(chan);
174 spin_lock_irqsave(&dmadata->dma_lock, flags);
175 __raw_writel(ctlbit, base + ACCTLEN);
176 dmadata->frag_count = NR_DMA_CHAIN % dmadata->frags;
177 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
180 if (WARN_ON(dmadata->dmacount >= NR_DMA_CHAIN)) {
181 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
184 while (dmadata->dmacount < NR_DMA_CHAIN) {
186 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
187 desc = txx9aclc_dma_submit(dmadata,
189 dmadata->frag_count * dmadata->frag_bytes);
192 dma_async_issue_pending(chan);
194 spin_lock_irqsave(&dmadata->dma_lock, flags);
195 dmadata->frag_count++;
196 dmadata->frag_count %= dmadata->frags;
197 dmadata->pos += dmadata->frag_bytes;
198 dmadata->pos %= dmadata->buffer_bytes;
199 if ((dmadata->frag_count * dmadata->frag_bytes) %
200 dmadata->period_bytes == 0)
201 snd_pcm_period_elapsed(substream);
203 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
206 static int txx9aclc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
208 struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
209 struct txx9aclc_plat_drvdata *drvdata =txx9aclc_drvdata;
210 void __iomem *base = drvdata->base;
213 u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
214 ACCTL_AUDODMA : ACCTL_AUDIDMA;
216 spin_lock_irqsave(&dmadata->dma_lock, flags);
218 case SNDRV_PCM_TRIGGER_START:
219 dmadata->frag_count = -1;
220 tasklet_schedule(&dmadata->tasklet);
222 case SNDRV_PCM_TRIGGER_STOP:
223 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
224 case SNDRV_PCM_TRIGGER_SUSPEND:
225 __raw_writel(ctlbit, base + ACCTLDIS);
227 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
228 case SNDRV_PCM_TRIGGER_RESUME:
229 __raw_writel(ctlbit, base + ACCTLEN);
234 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
238 static snd_pcm_uframes_t
239 txx9aclc_pcm_pointer(struct snd_pcm_substream *substream)
241 struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
243 return bytes_to_frames(substream->runtime, dmadata->pos);
246 static int txx9aclc_pcm_open(struct snd_pcm_substream *substream)
248 struct txx9aclc_soc_device *dev = &txx9aclc_soc_device;
249 struct txx9aclc_dmadata *dmadata = &dev->dmadata[substream->stream];
252 ret = snd_soc_set_runtime_hwparams(substream, &txx9aclc_pcm_hardware);
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);
260 substream->runtime->private_data = dmadata;
264 static int txx9aclc_pcm_close(struct snd_pcm_substream *substream)
266 struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
267 struct dma_chan *chan = dmadata->dma_chan;
269 dmadata->frag_count = -1;
270 dmaengine_terminate_all(chan);
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,
285 static int txx9aclc_pcm_new(struct snd_soc_pcm_runtime *rtd)
287 struct snd_card *card = rtd->card->snd_card;
288 struct snd_soc_dai *dai = rtd->cpu_dai;
289 struct snd_pcm *pcm = rtd->pcm;
290 struct platform_device *pdev = to_platform_device(rtd->platform->dev);
291 struct txx9aclc_soc_device *dev;
296 /* at this point onwards the AC97 component has probed and this will be valid */
297 dev = snd_soc_dai_get_drvdata(dai);
299 dev->dmadata[0].stream = SNDRV_PCM_STREAM_PLAYBACK;
300 dev->dmadata[1].stream = SNDRV_PCM_STREAM_CAPTURE;
301 for (i = 0; i < 2; i++) {
302 r = platform_get_resource(pdev, IORESOURCE_DMA, i);
307 dev->dmadata[i].dma_res = r;
308 ret = txx9aclc_dma_init(dev, &dev->dmadata[i]);
312 return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
313 card->dev, 64 * 1024, 4 * 1024 * 1024);
316 for (i = 0; i < 2; i++) {
317 if (dev->dmadata[i].dma_chan)
318 dma_release_channel(dev->dmadata[i].dma_chan);
319 dev->dmadata[i].dma_chan = NULL;
324 static bool filter(struct dma_chan *chan, void *param)
326 struct txx9aclc_dmadata *dmadata = param;
330 devname = kasprintf(GFP_KERNEL, "%s.%d", dmadata->dma_res->name,
331 (int)dmadata->dma_res->start);
332 if (strcmp(dev_name(chan->device->dev), devname) == 0) {
333 chan->private = &dmadata->dma_slave;
340 static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
341 struct txx9aclc_dmadata *dmadata)
343 struct txx9aclc_plat_drvdata *drvdata =txx9aclc_drvdata;
344 struct txx9dmac_slave *ds = &dmadata->dma_slave;
347 spin_lock_init(&dmadata->dma_lock);
349 ds->reg_width = sizeof(u32);
350 if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) {
351 ds->tx_reg = drvdata->physbase + ACAUDODAT;
355 ds->rx_reg = drvdata->physbase + ACAUDIDAT;
358 /* Try to grab a DMA channel */
360 dma_cap_set(DMA_SLAVE, mask);
361 dmadata->dma_chan = dma_request_channel(mask, filter, dmadata);
362 if (!dmadata->dma_chan) {
364 "DMA channel for %s is not available\n",
365 dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ?
366 "playback" : "capture");
369 tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet,
370 (unsigned long)dmadata);
374 static int txx9aclc_pcm_probe(struct snd_soc_platform *platform)
376 snd_soc_platform_set_drvdata(platform, &txx9aclc_soc_device);
380 static int txx9aclc_pcm_remove(struct snd_soc_platform *platform)
382 struct txx9aclc_soc_device *dev = snd_soc_platform_get_drvdata(platform);
383 struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
384 void __iomem *base = drvdata->base;
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);
392 for (i = 0; i < 2; i++) {
393 struct txx9aclc_dmadata *dmadata = &dev->dmadata[i];
394 struct dma_chan *chan = dmadata->dma_chan;
396 dmadata->frag_count = -1;
397 dmaengine_terminate_all(chan);
398 dma_release_channel(chan);
400 dev->dmadata[i].dma_chan = NULL;
405 static struct snd_soc_platform_driver txx9aclc_soc_platform = {
406 .probe = txx9aclc_pcm_probe,
407 .remove = txx9aclc_pcm_remove,
408 .ops = &txx9aclc_pcm_ops,
409 .pcm_new = txx9aclc_pcm_new,
412 static int txx9aclc_soc_platform_probe(struct platform_device *pdev)
414 return devm_snd_soc_register_platform(&pdev->dev,
415 &txx9aclc_soc_platform);
418 static struct platform_driver txx9aclc_pcm_driver = {
420 .name = "txx9aclc-pcm-audio",
423 .probe = txx9aclc_soc_platform_probe,
426 module_platform_driver(txx9aclc_pcm_driver);
428 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
429 MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver");
430 MODULE_LICENSE("GPL");