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Linux/sound/soc/kirkwood/kirkwood-dma.c

  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 static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs)
 25 {
 26         struct snd_soc_pcm_runtime *soc_runtime = subs->private_data;
 27         return snd_soc_dai_get_drvdata(soc_runtime->cpu_dai);
 28 }
 29 
 30 static struct snd_pcm_hardware kirkwood_dma_snd_hw = {
 31         .info = (SNDRV_PCM_INFO_INTERLEAVED |
 32                  SNDRV_PCM_INFO_MMAP |
 33                  SNDRV_PCM_INFO_MMAP_VALID |
 34                  SNDRV_PCM_INFO_BLOCK_TRANSFER |
 35                  SNDRV_PCM_INFO_PAUSE),
 36         .buffer_bytes_max       = KIRKWOOD_SND_MAX_BUFFER_BYTES,
 37         .period_bytes_min       = KIRKWOOD_SND_MIN_PERIOD_BYTES,
 38         .period_bytes_max       = KIRKWOOD_SND_MAX_PERIOD_BYTES,
 39         .periods_min            = KIRKWOOD_SND_MIN_PERIODS,
 40         .periods_max            = KIRKWOOD_SND_MAX_PERIODS,
 41         .fifo_size              = 0,
 42 };
 43 
 44 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
 45 {
 46         struct kirkwood_dma_data *priv = dev_id;
 47         unsigned long mask, status, cause;
 48 
 49         mask = readl(priv->io + KIRKWOOD_INT_MASK);
 50         status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
 51 
 52         cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
 53         if (unlikely(cause)) {
 54                 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
 55                                 __func__, cause);
 56                 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
 57         }
 58 
 59         /* we've enabled only bytes interrupts ... */
 60         if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
 61                         KIRKWOOD_INT_CAUSE_REC_BYTES)) {
 62                 printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
 63                         __func__, status);
 64                 return IRQ_NONE;
 65         }
 66 
 67         /* ack int */
 68         writel(status, priv->io + KIRKWOOD_INT_CAUSE);
 69 
 70         if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
 71                 snd_pcm_period_elapsed(priv->substream_play);
 72 
 73         if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
 74                 snd_pcm_period_elapsed(priv->substream_rec);
 75 
 76         return IRQ_HANDLED;
 77 }
 78 
 79 static void
 80 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
 81                                unsigned long dma,
 82                                const struct mbus_dram_target_info *dram)
 83 {
 84         int i;
 85 
 86         /* First disable and clear windows */
 87         writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
 88         writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
 89 
 90         /* try to find matching cs for current dma address */
 91         for (i = 0; i < dram->num_cs; i++) {
 92                 const struct mbus_dram_window *cs = dram->cs + i;
 93                 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
 94                         writel(cs->base & 0xffff0000,
 95                                 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
 96                         writel(((cs->size - 1) & 0xffff0000) |
 97                                 (cs->mbus_attr << 8) |
 98                                 (dram->mbus_dram_target_id << 4) | 1,
 99                                 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
100                 }
101         }
102 }
103 
104 static int kirkwood_dma_open(struct snd_pcm_substream *substream)
105 {
106         int err;
107         struct snd_pcm_runtime *runtime = substream->runtime;
108         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
109         const struct mbus_dram_target_info *dram;
110         unsigned long addr;
111 
112         snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
113 
114         /* Ensure that all constraints linked to dma burst are fulfilled */
115         err = snd_pcm_hw_constraint_minmax(runtime,
116                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
117                         priv->burst * 2,
118                         KIRKWOOD_AUDIO_BUF_MAX-1);
119         if (err < 0)
120                 return err;
121 
122         err = snd_pcm_hw_constraint_step(runtime, 0,
123                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
124                         priv->burst);
125         if (err < 0)
126                 return err;
127 
128         err = snd_pcm_hw_constraint_step(substream->runtime, 0,
129                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
130                          priv->burst);
131         if (err < 0)
132                 return err;
133 
134         if (!priv->substream_play && !priv->substream_rec) {
135                 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
136                                   "kirkwood-i2s", priv);
137                 if (err)
138                         return -EBUSY;
139 
140                 /*
141                  * Enable Error interrupts. We're only ack'ing them but
142                  * it's useful for diagnostics
143                  */
144                 writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK);
145         }
146 
147         dram = mv_mbus_dram_info();
148         addr = substream->dma_buffer.addr;
149         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
150                 priv->substream_play = substream;
151                 kirkwood_dma_conf_mbus_windows(priv->io,
152                         KIRKWOOD_PLAYBACK_WIN, addr, dram);
153         } else {
154                 priv->substream_rec = substream;
155                 kirkwood_dma_conf_mbus_windows(priv->io,
156                         KIRKWOOD_RECORD_WIN, addr, dram);
157         }
158 
159         return 0;
160 }
161 
162 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
163 {
164         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
165 
166         if (!priv)
167                 return 0;
168 
169         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
170                 priv->substream_play = NULL;
171         else
172                 priv->substream_rec = NULL;
173 
174         if (!priv->substream_play && !priv->substream_rec) {
175                 writel(0, priv->io + KIRKWOOD_ERR_MASK);
176                 free_irq(priv->irq, priv);
177         }
178 
179         return 0;
180 }
181 
182 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
183                                 struct snd_pcm_hw_params *params)
184 {
185         struct snd_pcm_runtime *runtime = substream->runtime;
186 
187         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
188         runtime->dma_bytes = params_buffer_bytes(params);
189 
190         return 0;
191 }
192 
193 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
194 {
195         snd_pcm_set_runtime_buffer(substream, NULL);
196         return 0;
197 }
198 
199 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
200 {
201         struct snd_pcm_runtime *runtime = substream->runtime;
202         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
203         unsigned long size, count;
204 
205         /* compute buffer size in term of "words" as requested in specs */
206         size = frames_to_bytes(runtime, runtime->buffer_size);
207         size = (size>>2)-1;
208         count = snd_pcm_lib_period_bytes(substream);
209 
210         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
211                 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
212                 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
213                 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
214         } else {
215                 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
216                 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
217                 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
218         }
219 
220 
221         return 0;
222 }
223 
224 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
225                                                 *substream)
226 {
227         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
228         snd_pcm_uframes_t count;
229 
230         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
231                 count = bytes_to_frames(substream->runtime,
232                         readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
233         else
234                 count = bytes_to_frames(substream->runtime,
235                         readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
236 
237         return count;
238 }
239 
240 static struct snd_pcm_ops kirkwood_dma_ops = {
241         .open =         kirkwood_dma_open,
242         .close =        kirkwood_dma_close,
243         .ioctl =        snd_pcm_lib_ioctl,
244         .hw_params =    kirkwood_dma_hw_params,
245         .hw_free =      kirkwood_dma_hw_free,
246         .prepare =      kirkwood_dma_prepare,
247         .pointer =      kirkwood_dma_pointer,
248 };
249 
250 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
251                 int stream)
252 {
253         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
254         struct snd_dma_buffer *buf = &substream->dma_buffer;
255         size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
256 
257         buf->dev.type = SNDRV_DMA_TYPE_DEV;
258         buf->dev.dev = pcm->card->dev;
259         buf->area = dma_alloc_coherent(pcm->card->dev, size,
260                         &buf->addr, GFP_KERNEL);
261         if (!buf->area)
262                 return -ENOMEM;
263         buf->bytes = size;
264         buf->private_data = NULL;
265 
266         return 0;
267 }
268 
269 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
270 {
271         struct snd_card *card = rtd->card->snd_card;
272         struct snd_pcm *pcm = rtd->pcm;
273         int ret;
274 
275         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
276         if (ret)
277                 return ret;
278 
279         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
280                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
281                                 SNDRV_PCM_STREAM_PLAYBACK);
282                 if (ret)
283                         return ret;
284         }
285 
286         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
287                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
288                                 SNDRV_PCM_STREAM_CAPTURE);
289                 if (ret)
290                         return ret;
291         }
292 
293         return 0;
294 }
295 
296 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
297 {
298         struct snd_pcm_substream *substream;
299         struct snd_dma_buffer *buf;
300         int stream;
301 
302         for (stream = 0; stream < 2; stream++) {
303                 substream = pcm->streams[stream].substream;
304                 if (!substream)
305                         continue;
306                 buf = &substream->dma_buffer;
307                 if (!buf->area)
308                         continue;
309 
310                 dma_free_coherent(pcm->card->dev, buf->bytes,
311                                 buf->area, buf->addr);
312                 buf->area = NULL;
313         }
314 }
315 
316 struct snd_soc_platform_driver kirkwood_soc_platform = {
317         .ops            = &kirkwood_dma_ops,
318         .pcm_new        = kirkwood_dma_new,
319         .pcm_free       = kirkwood_dma_free_dma_buffers,
320 };
321 

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