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 <sound/core.h>
20 #include <sound/pcm.h>
21 #include <sound/pcm_params.h>
22 #include <sound/soc.h>
25 static const struct snd_pcm_hardware txx9aclc_pcm_hardware = {
27 * REVISIT: SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
28 * needs more works for noncoherent MIPS.
30 .info = SNDRV_PCM_INFO_INTERLEAVED |
31 SNDRV_PCM_INFO_BATCH |
34 .formats = SNDRV_PCM_FMTBIT_S16_BE,
36 .formats = SNDRV_PCM_FMTBIT_S16_LE,
38 .period_bytes_min = 1024,
39 .period_bytes_max = 8 * 1024,
42 .buffer_bytes_max = 32 * 1024,
45 static int txx9aclc_pcm_hw_params(struct snd_pcm_substream *substream,
46 struct snd_pcm_hw_params *params)
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;
54 ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
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,
65 "periods %d period_bytes %d stream %d\n",
66 params_periods(params), params_period_bytes(params),
69 dmadata->substream = substream;
74 static int txx9aclc_pcm_hw_free(struct snd_pcm_substream *substream)
76 return snd_pcm_lib_free_pages(substream);
79 static int txx9aclc_pcm_prepare(struct snd_pcm_substream *substream)
81 struct snd_pcm_runtime *runtime = substream->runtime;
82 struct txx9aclc_dmadata *dmadata = runtime->private_data;
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);
88 if (dmadata->buffer_bytes == dmadata->period_bytes) {
89 dmadata->frag_bytes = dmadata->period_bytes >> 1;
92 dmadata->frag_bytes = dmadata->period_bytes;
93 dmadata->frags = dmadata->buffer_bytes / dmadata->period_bytes;
95 dmadata->frag_count = 0;
100 static void txx9aclc_dma_complete(void *arg)
102 struct txx9aclc_dmadata *dmadata = arg;
105 /* dma completion handler cannot submit new operations */
106 spin_lock_irqsave(&dmadata->dma_lock, flags);
107 if (dmadata->frag_count >= 0) {
109 BUG_ON(dmadata->dmacount < 0);
110 tasklet_schedule(&dmadata->tasklet);
112 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
115 static struct dma_async_tx_descriptor *
116 txx9aclc_dma_submit(struct txx9aclc_dmadata *dmadata, dma_addr_t buf_dma_addr)
118 struct dma_chan *chan = dmadata->dma_chan;
119 struct dma_async_tx_descriptor *desc;
120 struct scatterlist sg;
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);
131 dev_err(&chan->dev->device, "cannot prepare slave dma\n");
134 desc->callback = txx9aclc_dma_complete;
135 desc->callback_param = dmadata;
136 desc->tx_submit(desc);
140 #define NR_DMA_CHAIN 2
142 static void txx9aclc_dma_tasklet(unsigned long data)
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;
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;
162 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
163 chan->device->device_terminate_all(chan);
165 for (i = 0; i < NR_DMA_CHAIN; i++) {
166 desc = txx9aclc_dma_submit(dmadata,
167 dmadata->dma_addr + i * dmadata->frag_bytes);
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);
179 BUG_ON(dmadata->dmacount >= NR_DMA_CHAIN);
180 while (dmadata->dmacount < NR_DMA_CHAIN) {
182 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
183 desc = txx9aclc_dma_submit(dmadata,
185 dmadata->frag_count * dmadata->frag_bytes);
188 chan->device->device_issue_pending(chan);
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);
199 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
202 static int txx9aclc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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;
212 u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
213 ACCTL_AUDODMA : ACCTL_AUDIDMA;
215 spin_lock_irqsave(&dmadata->dma_lock, flags);
217 case SNDRV_PCM_TRIGGER_START:
218 dmadata->frag_count = -1;
219 tasklet_schedule(&dmadata->tasklet);
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);
226 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
227 case SNDRV_PCM_TRIGGER_RESUME:
228 __raw_writel(ctlbit, base + ACCTLEN);
233 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
237 static snd_pcm_uframes_t
238 txx9aclc_pcm_pointer(struct snd_pcm_substream *substream)
240 struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
242 return bytes_to_frames(substream->runtime, dmadata->pos);
245 static int txx9aclc_pcm_open(struct snd_pcm_substream *substream)
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];
253 ret = snd_soc_set_runtime_hwparams(substream, &txx9aclc_pcm_hardware);
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);
261 substream->runtime->private_data = dmadata;
265 static int txx9aclc_pcm_close(struct snd_pcm_substream *substream)
267 struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
268 struct dma_chan *chan = dmadata->dma_chan;
270 dmadata->frag_count = -1;
271 chan->device->device_terminate_all(chan);
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,
286 static void txx9aclc_pcm_free_dma_buffers(struct snd_pcm *pcm)
288 snd_pcm_lib_preallocate_free_for_all(pcm);
291 static int txx9aclc_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
294 return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
295 card->dev, 64 * 1024, 4 * 1024 * 1024);
298 static bool filter(struct dma_chan *chan, void *param)
300 struct txx9aclc_dmadata *dmadata = param;
304 devname = kasprintf(GFP_KERNEL, "%s.%d", dmadata->dma_res->name,
305 (int)dmadata->dma_res->start);
306 if (strcmp(dev_name(chan->device->dev), devname) == 0) {
307 chan->private = &dmadata->dma_slave;
314 static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
315 struct txx9aclc_dmadata *dmadata)
317 struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
318 struct txx9dmac_slave *ds = &dmadata->dma_slave;
321 spin_lock_init(&dmadata->dma_lock);
323 ds->reg_width = sizeof(u32);
324 if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) {
325 ds->tx_reg = drvdata->physbase + ACAUDODAT;
329 ds->rx_reg = drvdata->physbase + ACAUDIDAT;
332 /* Try to grab a DMA channel */
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");
343 tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet,
344 (unsigned long)dmadata);
348 static int txx9aclc_pcm_probe(struct platform_device *pdev)
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);
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);
365 dev->dmadata[i].dma_res = r;
366 ret = txx9aclc_dma_init(dev, &dev->dmadata[i]);
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;
381 static int txx9aclc_pcm_remove(struct platform_device *pdev)
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;
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);
395 for (i = 0; i < 2; i++) {
396 struct txx9aclc_dmadata *dmadata = &dev->dmadata[i];
397 struct dma_chan *chan = dmadata->dma_chan;
399 dmadata->frag_count = -1;
400 chan->device->device_terminate_all(chan);
401 dma_release_channel(chan);
403 dev->dmadata[i].dma_chan = NULL;
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,
416 EXPORT_SYMBOL_GPL(txx9aclc_soc_platform);
418 static int __init txx9aclc_soc_platform_init(void)
420 return snd_soc_register_platform(&txx9aclc_soc_platform);
423 static void __exit txx9aclc_soc_platform_exit(void)
425 snd_soc_unregister_platform(&txx9aclc_soc_platform);
428 module_init(txx9aclc_soc_platform_init);
429 module_exit(txx9aclc_soc_platform_exit);
431 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
432 MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver");
433 MODULE_LICENSE("GPL");