1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Generic TXx9 ACLC platform driver
4 *
5 * Copyright (C) 2009 Atsushi Nemoto
6 *
7 * Based on RBTX49xx patch from CELF patch archive.
8 * (C) Copyright TOSHIBA CORPORATION 2004-2006
9 */
10
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/platform_device.h>
14 #include <linux/scatterlist.h>
15 #include <linux/slab.h>
16 #include <linux/dmaengine.h>
17 #include <sound/core.h>
18 #include <sound/pcm.h>
19 #include <sound/pcm_params.h>
20 #include <sound/soc.h>
21 #include "txx9aclc.h"
22
23 #define DRV_NAME "txx9aclc"
24
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
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 .period_bytes_min = 1024,
44 .period_bytes_max = 8 * 1024,
45 .periods_min = 2,
46 .periods_max = 4096,
47 .buffer_bytes_max = 32 * 1024,
48 };
49
txx9aclc_pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)50 static int txx9aclc_pcm_hw_params(struct snd_pcm_substream *substream,
51 struct snd_pcm_hw_params *params)
52 {
53 struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
54 struct snd_pcm_runtime *runtime = substream->runtime;
55 struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
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(component->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(component->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
txx9aclc_pcm_hw_free(struct snd_pcm_substream * substream)79 static int txx9aclc_pcm_hw_free(struct snd_pcm_substream *substream)
80 {
81 return snd_pcm_lib_free_pages(substream);
82 }
83
txx9aclc_pcm_prepare(struct snd_pcm_substream * substream)84 static 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
txx9aclc_dma_complete(void * arg)105 static 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
120 static struct dma_async_tx_descriptor *
txx9aclc_dma_submit(struct txx9aclc_dmadata * dmadata,dma_addr_t buf_dma_addr)121 txx9aclc_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
txx9aclc_dma_tasklet(unsigned long data)147 static 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
txx9aclc_pcm_trigger(struct snd_pcm_substream * substream,int cmd)206 static 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
238 static snd_pcm_uframes_t
txx9aclc_pcm_pointer(struct snd_pcm_substream * substream)239 txx9aclc_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
txx9aclc_pcm_open(struct snd_pcm_substream * substream)246 static 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
txx9aclc_pcm_close(struct snd_pcm_substream * substream)264 static 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
274 static const 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
txx9aclc_pcm_new(struct snd_soc_pcm_runtime * rtd)285 static 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 snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
291 struct platform_device *pdev = to_platform_device(component->dev);
292 struct txx9aclc_soc_device *dev;
293 struct resource *r;
294 int i;
295 int ret;
296
297 /* at this point onwards the AC97 component has probed and this will be valid */
298 dev = snd_soc_dai_get_drvdata(dai);
299
300 dev->dmadata[0].stream = SNDRV_PCM_STREAM_PLAYBACK;
301 dev->dmadata[1].stream = SNDRV_PCM_STREAM_CAPTURE;
302 for (i = 0; i < 2; i++) {
303 r = platform_get_resource(pdev, IORESOURCE_DMA, i);
304 if (!r) {
305 ret = -EBUSY;
306 goto exit;
307 }
308 dev->dmadata[i].dma_res = r;
309 ret = txx9aclc_dma_init(dev, &dev->dmadata[i]);
310 if (ret)
311 goto exit;
312 }
313
314 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
315 card->dev, 64 * 1024, 4 * 1024 * 1024);
316 return 0;
317
318 exit:
319 for (i = 0; i < 2; i++) {
320 if (dev->dmadata[i].dma_chan)
321 dma_release_channel(dev->dmadata[i].dma_chan);
322 dev->dmadata[i].dma_chan = NULL;
323 }
324 return ret;
325 }
326
filter(struct dma_chan * chan,void * param)327 static bool filter(struct dma_chan *chan, void *param)
328 {
329 struct txx9aclc_dmadata *dmadata = param;
330 char *devname;
331 bool found = false;
332
333 devname = kasprintf(GFP_KERNEL, "%s.%d", dmadata->dma_res->name,
334 (int)dmadata->dma_res->start);
335 if (strcmp(dev_name(chan->device->dev), devname) == 0) {
336 chan->private = &dmadata->dma_slave;
337 found = true;
338 }
339 kfree(devname);
340 return found;
341 }
342
txx9aclc_dma_init(struct txx9aclc_soc_device * dev,struct txx9aclc_dmadata * dmadata)343 static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
344 struct txx9aclc_dmadata *dmadata)
345 {
346 struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
347 struct txx9dmac_slave *ds = &dmadata->dma_slave;
348 dma_cap_mask_t mask;
349
350 spin_lock_init(&dmadata->dma_lock);
351
352 ds->reg_width = sizeof(u32);
353 if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) {
354 ds->tx_reg = drvdata->physbase + ACAUDODAT;
355 ds->rx_reg = 0;
356 } else {
357 ds->tx_reg = 0;
358 ds->rx_reg = drvdata->physbase + ACAUDIDAT;
359 }
360
361 /* Try to grab a DMA channel */
362 dma_cap_zero(mask);
363 dma_cap_set(DMA_SLAVE, mask);
364 dmadata->dma_chan = dma_request_channel(mask, filter, dmadata);
365 if (!dmadata->dma_chan) {
366 printk(KERN_ERR
367 "DMA channel for %s is not available\n",
368 dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ?
369 "playback" : "capture");
370 return -EBUSY;
371 }
372 tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet,
373 (unsigned long)dmadata);
374 return 0;
375 }
376
txx9aclc_pcm_probe(struct snd_soc_component * component)377 static int txx9aclc_pcm_probe(struct snd_soc_component *component)
378 {
379 snd_soc_component_set_drvdata(component, &txx9aclc_soc_device);
380 return 0;
381 }
382
txx9aclc_pcm_remove(struct snd_soc_component * component)383 static void txx9aclc_pcm_remove(struct snd_soc_component *component)
384 {
385 struct txx9aclc_soc_device *dev = snd_soc_component_get_drvdata(component);
386 struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
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
399 if (chan) {
400 dmadata->frag_count = -1;
401 dmaengine_terminate_all(chan);
402 dma_release_channel(chan);
403 }
404 dev->dmadata[i].dma_chan = NULL;
405 }
406 }
407
408 static const struct snd_soc_component_driver txx9aclc_soc_component = {
409 .name = DRV_NAME,
410 .probe = txx9aclc_pcm_probe,
411 .remove = txx9aclc_pcm_remove,
412 .ops = &txx9aclc_pcm_ops,
413 .pcm_new = txx9aclc_pcm_new,
414 };
415
txx9aclc_soc_platform_probe(struct platform_device * pdev)416 static int txx9aclc_soc_platform_probe(struct platform_device *pdev)
417 {
418 return devm_snd_soc_register_component(&pdev->dev,
419 &txx9aclc_soc_component, NULL, 0);
420 }
421
422 static struct platform_driver txx9aclc_pcm_driver = {
423 .driver = {
424 .name = "txx9aclc-pcm-audio",
425 },
426
427 .probe = txx9aclc_soc_platform_probe,
428 };
429
430 module_platform_driver(txx9aclc_pcm_driver);
431
432 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
433 MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver");
434 MODULE_LICENSE("GPL");
435