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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 <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>
24#include "txx9aclc.h"
25
26static struct txx9aclc_soc_device {
27 struct txx9aclc_dmadata dmadata[2];
28} txx9aclc_soc_device;
29
30/* REVISIT: How to find txx9aclc_drvdata from snd_ac97? */
31static struct txx9aclc_plat_drvdata *txx9aclc_drvdata;
32
33static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
34 struct txx9aclc_dmadata *dmadata);
35
36static const struct snd_pcm_hardware txx9aclc_pcm_hardware = {
37 /*
38 * REVISIT: SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
39 * needs more works for noncoherent MIPS.
40 */
41 .info = SNDRV_PCM_INFO_INTERLEAVED |
42 SNDRV_PCM_INFO_BATCH |
43 SNDRV_PCM_INFO_PAUSE,
44 .period_bytes_min = 1024,
45 .period_bytes_max = 8 * 1024,
46 .periods_min = 2,
47 .periods_max = 4096,
48 .buffer_bytes_max = 32 * 1024,
49};
50
51static int txx9aclc_pcm_hw_params(struct snd_pcm_substream *substream,
52 struct snd_pcm_hw_params *params)
53{
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;
57 int ret;
58
59 ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
60 if (ret < 0)
61 return ret;
62
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,
68 runtime->min_align);
69 dev_dbg(rtd->platform->dev,
70 "periods %d period_bytes %d stream %d\n",
71 params_periods(params), params_period_bytes(params),
72 substream->stream);
73
74 dmadata->substream = substream;
75 dmadata->pos = 0;
76 return 0;
77}
78
79static int txx9aclc_pcm_hw_free(struct snd_pcm_substream *substream)
80{
81 return snd_pcm_lib_free_pages(substream);
82}
83
84static int txx9aclc_pcm_prepare(struct snd_pcm_substream *substream)
85{
86 struct snd_pcm_runtime *runtime = substream->runtime;
87 struct txx9aclc_dmadata *dmadata = runtime->private_data;
88
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);
92
93 if (dmadata->buffer_bytes == dmadata->period_bytes) {
94 dmadata->frag_bytes = dmadata->period_bytes >> 1;
95 dmadata->frags = 2;
96 } else {
97 dmadata->frag_bytes = dmadata->period_bytes;
98 dmadata->frags = dmadata->buffer_bytes / dmadata->period_bytes;
99 }
100 dmadata->frag_count = 0;
101 dmadata->pos = 0;
102 return 0;
103}
104
105static void txx9aclc_dma_complete(void *arg)
106{
107 struct txx9aclc_dmadata *dmadata = arg;
108 unsigned long flags;
109
110 /* dma completion handler cannot submit new operations */
111 spin_lock_irqsave(&dmadata->dma_lock, flags);
112 if (dmadata->frag_count >= 0) {
113 dmadata->dmacount--;
114 if (!WARN_ON(dmadata->dmacount < 0))
115 tasklet_schedule(&dmadata->tasklet);
116 }
117 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
118}
119
120static struct dma_async_tx_descriptor *
121txx9aclc_dma_submit(struct txx9aclc_dmadata *dmadata, dma_addr_t buf_dma_addr)
122{
123 struct dma_chan *chan = dmadata->dma_chan;
124 struct dma_async_tx_descriptor *desc;
125 struct scatterlist sg;
126
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);
135 if (!desc) {
136 dev_err(&chan->dev->device, "cannot prepare slave dma\n");
137 return NULL;
138 }
139 desc->callback = txx9aclc_dma_complete;
140 desc->callback_param = dmadata;
141 dmaengine_submit(desc);
142 return desc;
143}
144
145#define NR_DMA_CHAIN 2
146
147static void txx9aclc_dma_tasklet(unsigned long data)
148{
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;
155 int i;
156 unsigned long flags;
157
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;
162
163 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
164 dmaengine_terminate_all(chan);
165 /* first time */
166 for (i = 0; i < NR_DMA_CHAIN; i++) {
167 desc = txx9aclc_dma_submit(dmadata,
168 dmadata->dma_addr + i * dmadata->frag_bytes);
169 if (!desc)
170 return;
171 }
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);
178 return;
179 }
180 if (WARN_ON(dmadata->dmacount >= NR_DMA_CHAIN)) {
181 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
182 return;
183 }
184 while (dmadata->dmacount < NR_DMA_CHAIN) {
185 dmadata->dmacount++;
186 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
187 desc = txx9aclc_dma_submit(dmadata,
188 dmadata->dma_addr +
189 dmadata->frag_count * dmadata->frag_bytes);
190 if (!desc)
191 return;
192 dma_async_issue_pending(chan);
193
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);
202 }
203 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
204}
205
206static int txx9aclc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
207{
208 struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
209 struct txx9aclc_plat_drvdata *drvdata =txx9aclc_drvdata;
210 void __iomem *base = drvdata->base;
211 unsigned long flags;
212 int ret = 0;
213 u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
214 ACCTL_AUDODMA : ACCTL_AUDIDMA;
215
216 spin_lock_irqsave(&dmadata->dma_lock, flags);
217 switch (cmd) {
218 case SNDRV_PCM_TRIGGER_START:
219 dmadata->frag_count = -1;
220 tasklet_schedule(&dmadata->tasklet);
221 break;
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);
226 break;
227 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
228 case SNDRV_PCM_TRIGGER_RESUME:
229 __raw_writel(ctlbit, base + ACCTLEN);
230 break;
231 default:
232 ret = -EINVAL;
233 }
234 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
235 return ret;
236}
237
238static snd_pcm_uframes_t
239txx9aclc_pcm_pointer(struct snd_pcm_substream *substream)
240{
241 struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
242
243 return bytes_to_frames(substream->runtime, dmadata->pos);
244}
245
246static int txx9aclc_pcm_open(struct snd_pcm_substream *substream)
247{
248 struct txx9aclc_soc_device *dev = &txx9aclc_soc_device;
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
264static 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 dmaengine_terminate_all(chan);
271 return 0;
272}
273
274static 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
285static int txx9aclc_pcm_new(struct snd_soc_pcm_runtime *rtd)
286{
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;
292 struct resource *r;
293 int i;
294 int ret;
295
296 /* at this point onwards the AC97 component has probed and this will be valid */
297 dev = snd_soc_dai_get_drvdata(dai);
298
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);
303 if (!r) {
304 ret = -EBUSY;
305 goto exit;
306 }
307 dev->dmadata[i].dma_res = r;
308 ret = txx9aclc_dma_init(dev, &dev->dmadata[i]);
309 if (ret)
310 goto exit;
311 }
312 return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
313 card->dev, 64 * 1024, 4 * 1024 * 1024);
314
315exit:
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;
320 }
321 return ret;
322}
323
324static bool filter(struct dma_chan *chan, void *param)
325{
326 struct txx9aclc_dmadata *dmadata = param;
327 char *devname;
328 bool found = false;
329
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;
334 found = true;
335 }
336 kfree(devname);
337 return found;
338}
339
340static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
341 struct txx9aclc_dmadata *dmadata)
342{
343 struct txx9aclc_plat_drvdata *drvdata =txx9aclc_drvdata;
344 struct txx9dmac_slave *ds = &dmadata->dma_slave;
345 dma_cap_mask_t mask;
346
347 spin_lock_init(&dmadata->dma_lock);
348
349 ds->reg_width = sizeof(u32);
350 if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) {
351 ds->tx_reg = drvdata->physbase + ACAUDODAT;
352 ds->rx_reg = 0;
353 } else {
354 ds->tx_reg = 0;
355 ds->rx_reg = drvdata->physbase + ACAUDIDAT;
356 }
357
358 /* Try to grab a DMA channel */
359 dma_cap_zero(mask);
360 dma_cap_set(DMA_SLAVE, mask);
361 dmadata->dma_chan = dma_request_channel(mask, filter, dmadata);
362 if (!dmadata->dma_chan) {
363 printk(KERN_ERR
364 "DMA channel for %s is not available\n",
365 dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ?
366 "playback" : "capture");
367 return -EBUSY;
368 }
369 tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet,
370 (unsigned long)dmadata);
371 return 0;
372}
373
374static int txx9aclc_pcm_probe(struct snd_soc_platform *platform)
375{
376 snd_soc_platform_set_drvdata(platform, &txx9aclc_soc_device);
377 return 0;
378}
379
380static int txx9aclc_pcm_remove(struct snd_soc_platform *platform)
381{
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;
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 dmaengine_terminate_all(chan);
398 dma_release_channel(chan);
399 }
400 dev->dmadata[i].dma_chan = NULL;
401 }
402 return 0;
403}
404
405static 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,
410};
411
412static int txx9aclc_soc_platform_probe(struct platform_device *pdev)
413{
414 return devm_snd_soc_register_platform(&pdev->dev,
415 &txx9aclc_soc_platform);
416}
417
418static struct platform_driver txx9aclc_pcm_driver = {
419 .driver = {
420 .name = "txx9aclc-pcm-audio",
421 },
422
423 .probe = txx9aclc_soc_platform_probe,
424};
425
426module_platform_driver(txx9aclc_pcm_driver);
427
428MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
429MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver");
430MODULE_LICENSE("GPL");