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1 /*
2  * kirkwood-dma.c
3  *
4  * (c) 2010 Arnaud Patard <apatard@mandriva.com>
5  * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
6  *
7  *  This program is free software; you can redistribute  it and/or modify it
8  *  under  the terms of  the GNU General  Public License as published by the
9  *  Free Software Foundation;  either version 2 of the  License, or (at your
10  *  option) any later version.
11  */
12
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/device.h>
16 #include <linux/io.h>
17 #include <linux/slab.h>
18 #include <linux/interrupt.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/mbus.h>
21 #include <sound/soc.h>
22 #include "kirkwood.h"
23
24 #define KIRKWOOD_RATES \
25         (SNDRV_PCM_RATE_44100 | \
26          SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
27 #define KIRKWOOD_FORMATS \
28         (SNDRV_PCM_FMTBIT_S16_LE | \
29          SNDRV_PCM_FMTBIT_S24_LE | \
30          SNDRV_PCM_FMTBIT_S32_LE)
31
32 struct kirkwood_dma_priv {
33         struct snd_pcm_substream *play_stream;
34         struct snd_pcm_substream *rec_stream;
35         struct kirkwood_dma_data *data;
36 };
37
38 static struct snd_pcm_hardware kirkwood_dma_snd_hw = {
39         .info = (SNDRV_PCM_INFO_INTERLEAVED |
40                  SNDRV_PCM_INFO_MMAP |
41                  SNDRV_PCM_INFO_MMAP_VALID |
42                  SNDRV_PCM_INFO_BLOCK_TRANSFER |
43                  SNDRV_PCM_INFO_PAUSE),
44         .formats                = KIRKWOOD_FORMATS,
45         .rates                  = KIRKWOOD_RATES,
46         .rate_min               = 44100,
47         .rate_max               = 96000,
48         .channels_min           = 1,
49         .channels_max           = 2,
50         .buffer_bytes_max       = KIRKWOOD_SND_MAX_PERIOD_BYTES * KIRKWOOD_SND_MAX_PERIODS,
51         .period_bytes_min       = KIRKWOOD_SND_MIN_PERIOD_BYTES,
52         .period_bytes_max       = KIRKWOOD_SND_MAX_PERIOD_BYTES,
53         .periods_min            = KIRKWOOD_SND_MIN_PERIODS,
54         .periods_max            = KIRKWOOD_SND_MAX_PERIODS,
55         .fifo_size              = 0,
56 };
57
58 static u64 kirkwood_dma_dmamask = DMA_BIT_MASK(32);
59
60 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
61 {
62         struct kirkwood_dma_priv *prdata = dev_id;
63         struct kirkwood_dma_data *priv = prdata->data;
64         unsigned long mask, status, cause;
65
66         mask = readl(priv->io + KIRKWOOD_INT_MASK);
67         status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
68
69         cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
70         if (unlikely(cause)) {
71                 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
72                                 __func__, cause);
73                 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
74                 return IRQ_HANDLED;
75         }
76
77         /* we've enabled only bytes interrupts ... */
78         if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
79                         KIRKWOOD_INT_CAUSE_REC_BYTES)) {
80                 printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
81                         __func__, status);
82                 return IRQ_NONE;
83         }
84
85         /* ack int */
86         writel(status, priv->io + KIRKWOOD_INT_CAUSE);
87
88         if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
89                 snd_pcm_period_elapsed(prdata->play_stream);
90
91         if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
92                 snd_pcm_period_elapsed(prdata->rec_stream);
93
94         return IRQ_HANDLED;
95 }
96
97 static void
98 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
99                                unsigned long dma,
100                                const struct mbus_dram_target_info *dram)
101 {
102         int i;
103
104         /* First disable and clear windows */
105         writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
106         writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
107
108         /* try to find matching cs for current dma address */
109         for (i = 0; i < dram->num_cs; i++) {
110                 const struct mbus_dram_window *cs = dram->cs + i;
111                 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
112                         writel(cs->base & 0xffff0000,
113                                 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
114                         writel(((cs->size - 1) & 0xffff0000) |
115                                 (cs->mbus_attr << 8) |
116                                 (dram->mbus_dram_target_id << 4) | 1,
117                                 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
118                 }
119         }
120 }
121
122 static int kirkwood_dma_open(struct snd_pcm_substream *substream)
123 {
124         int err;
125         struct snd_pcm_runtime *runtime = substream->runtime;
126         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
127         struct snd_soc_platform *platform = soc_runtime->platform;
128         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
129         struct kirkwood_dma_data *priv;
130         struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
131         const struct mbus_dram_target_info *dram;
132         unsigned long addr;
133
134         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
135         snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
136
137         /* Ensure that all constraints linked to dma burst are fulfilled */
138         err = snd_pcm_hw_constraint_minmax(runtime,
139                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
140                         priv->burst * 2,
141                         KIRKWOOD_AUDIO_BUF_MAX-1);
142         if (err < 0)
143                 return err;
144
145         err = snd_pcm_hw_constraint_step(runtime, 0,
146                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
147                         priv->burst);
148         if (err < 0)
149                 return err;
150
151         err = snd_pcm_hw_constraint_step(substream->runtime, 0,
152                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
153                          priv->burst);
154         if (err < 0)
155                 return err;
156
157         if (prdata == NULL) {
158                 prdata = kzalloc(sizeof(struct kirkwood_dma_priv), GFP_KERNEL);
159                 if (prdata == NULL)
160                         return -ENOMEM;
161
162                 prdata->data = priv;
163
164                 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
165                                   "kirkwood-i2s", prdata);
166                 if (err) {
167                         kfree(prdata);
168                         return -EBUSY;
169                 }
170
171                 snd_soc_platform_set_drvdata(platform, prdata);
172
173                 /*
174                  * Enable Error interrupts. We're only ack'ing them but
175                  * it's useful for diagnostics
176                  */
177                 writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK);
178         }
179
180         dram = mv_mbus_dram_info();
181         addr = virt_to_phys(substream->dma_buffer.area);
182         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
183                 prdata->play_stream = substream;
184                 kirkwood_dma_conf_mbus_windows(priv->io,
185                         KIRKWOOD_PLAYBACK_WIN, addr, dram);
186         } else {
187                 prdata->rec_stream = substream;
188                 kirkwood_dma_conf_mbus_windows(priv->io,
189                         KIRKWOOD_RECORD_WIN, addr, dram);
190         }
191
192         return 0;
193 }
194
195 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
196 {
197         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
198         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
199         struct snd_soc_platform *platform = soc_runtime->platform;
200         struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
201         struct kirkwood_dma_data *priv;
202
203         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
204
205         if (!prdata || !priv)
206                 return 0;
207
208         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
209                 prdata->play_stream = NULL;
210         else
211                 prdata->rec_stream = NULL;
212
213         if (!prdata->play_stream && !prdata->rec_stream) {
214                 writel(0, priv->io + KIRKWOOD_ERR_MASK);
215                 free_irq(priv->irq, prdata);
216                 kfree(prdata);
217                 snd_soc_platform_set_drvdata(platform, NULL);
218         }
219
220         return 0;
221 }
222
223 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
224                                 struct snd_pcm_hw_params *params)
225 {
226         struct snd_pcm_runtime *runtime = substream->runtime;
227
228         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
229         runtime->dma_bytes = params_buffer_bytes(params);
230
231         return 0;
232 }
233
234 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
235 {
236         snd_pcm_set_runtime_buffer(substream, NULL);
237         return 0;
238 }
239
240 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
241 {
242         struct snd_pcm_runtime *runtime = substream->runtime;
243         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
244         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
245         struct kirkwood_dma_data *priv;
246         unsigned long size, count;
247
248         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
249
250         /* compute buffer size in term of "words" as requested in specs */
251         size = frames_to_bytes(runtime, runtime->buffer_size);
252         size = (size>>2)-1;
253         count = snd_pcm_lib_period_bytes(substream);
254
255         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
256                 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
257                 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
258                 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
259         } else {
260                 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
261                 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
262                 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
263         }
264
265
266         return 0;
267 }
268
269 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
270                                                 *substream)
271 {
272         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
273         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
274         struct kirkwood_dma_data *priv;
275         snd_pcm_uframes_t count;
276
277         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
278
279         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
280                 count = bytes_to_frames(substream->runtime,
281                         readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
282         else
283                 count = bytes_to_frames(substream->runtime,
284                         readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
285
286         return count;
287 }
288
289 struct snd_pcm_ops kirkwood_dma_ops = {
290         .open =         kirkwood_dma_open,
291         .close =        kirkwood_dma_close,
292         .ioctl =        snd_pcm_lib_ioctl,
293         .hw_params =    kirkwood_dma_hw_params,
294         .hw_free =      kirkwood_dma_hw_free,
295         .prepare =      kirkwood_dma_prepare,
296         .pointer =      kirkwood_dma_pointer,
297 };
298
299 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
300                 int stream)
301 {
302         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
303         struct snd_dma_buffer *buf = &substream->dma_buffer;
304         size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
305
306         buf->dev.type = SNDRV_DMA_TYPE_DEV;
307         buf->dev.dev = pcm->card->dev;
308         buf->area = dma_alloc_coherent(pcm->card->dev, size,
309                         &buf->addr, GFP_KERNEL);
310         if (!buf->area)
311                 return -ENOMEM;
312         buf->bytes = size;
313         buf->private_data = NULL;
314
315         return 0;
316 }
317
318 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
319 {
320         struct snd_card *card = rtd->card->snd_card;
321         struct snd_pcm *pcm = rtd->pcm;
322         int ret;
323
324         if (!card->dev->dma_mask)
325                 card->dev->dma_mask = &kirkwood_dma_dmamask;
326         if (!card->dev->coherent_dma_mask)
327                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
328
329         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
330                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
331                                 SNDRV_PCM_STREAM_PLAYBACK);
332                 if (ret)
333                         return ret;
334         }
335
336         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
337                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
338                                 SNDRV_PCM_STREAM_CAPTURE);
339                 if (ret)
340                         return ret;
341         }
342
343         return 0;
344 }
345
346 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
347 {
348         struct snd_pcm_substream *substream;
349         struct snd_dma_buffer *buf;
350         int stream;
351
352         for (stream = 0; stream < 2; stream++) {
353                 substream = pcm->streams[stream].substream;
354                 if (!substream)
355                         continue;
356                 buf = &substream->dma_buffer;
357                 if (!buf->area)
358                         continue;
359
360                 dma_free_coherent(pcm->card->dev, buf->bytes,
361                                 buf->area, buf->addr);
362                 buf->area = NULL;
363         }
364 }
365
366 static struct snd_soc_platform_driver kirkwood_soc_platform = {
367         .ops            = &kirkwood_dma_ops,
368         .pcm_new        = kirkwood_dma_new,
369         .pcm_free       = kirkwood_dma_free_dma_buffers,
370 };
371
372 static int __devinit kirkwood_soc_platform_probe(struct platform_device *pdev)
373 {
374         return snd_soc_register_platform(&pdev->dev, &kirkwood_soc_platform);
375 }
376
377 static int __devexit kirkwood_soc_platform_remove(struct platform_device *pdev)
378 {
379         snd_soc_unregister_platform(&pdev->dev);
380         return 0;
381 }
382
383 static struct platform_driver kirkwood_pcm_driver = {
384         .driver = {
385                         .name = "kirkwood-pcm-audio",
386                         .owner = THIS_MODULE,
387         },
388
389         .probe = kirkwood_soc_platform_probe,
390         .remove = __devexit_p(kirkwood_soc_platform_remove),
391 };
392
393 module_platform_driver(kirkwood_pcm_driver);
394
395 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
396 MODULE_DESCRIPTION("Marvell Kirkwood Audio DMA module");
397 MODULE_LICENSE("GPL");
398 MODULE_ALIAS("platform:kirkwood-pcm-audio");