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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                 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
 37         .buffer_bytes_max       = KIRKWOOD_SND_MAX_BUFFER_BYTES,
 38         .period_bytes_min       = KIRKWOOD_SND_MIN_PERIOD_BYTES,
 39         .period_bytes_max       = KIRKWOOD_SND_MAX_PERIOD_BYTES,
 40         .periods_min            = KIRKWOOD_SND_MIN_PERIODS,
 41         .periods_max            = KIRKWOOD_SND_MAX_PERIODS,
 42         .fifo_size              = 0,
 43 };
 44 
 45 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
 46 {
 47         struct kirkwood_dma_data *priv = dev_id;
 48         unsigned long mask, status, cause;
 49 
 50         mask = readl(priv->io + KIRKWOOD_INT_MASK);
 51         status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
 52 
 53         cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
 54         if (unlikely(cause)) {
 55                 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
 56                                 __func__, cause);
 57                 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
 58         }
 59 
 60         /* we've enabled only bytes interrupts ... */
 61         if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
 62                         KIRKWOOD_INT_CAUSE_REC_BYTES)) {
 63                 printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
 64                         __func__, status);
 65                 return IRQ_NONE;
 66         }
 67 
 68         /* ack int */
 69         writel(status, priv->io + KIRKWOOD_INT_CAUSE);
 70 
 71         if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
 72                 snd_pcm_period_elapsed(priv->substream_play);
 73 
 74         if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
 75                 snd_pcm_period_elapsed(priv->substream_rec);
 76 
 77         return IRQ_HANDLED;
 78 }
 79 
 80 static void
 81 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
 82                                unsigned long dma,
 83                                const struct mbus_dram_target_info *dram)
 84 {
 85         int i;
 86 
 87         /* First disable and clear windows */
 88         writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
 89         writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
 90 
 91         /* try to find matching cs for current dma address */
 92         for (i = 0; i < dram->num_cs; i++) {
 93                 const struct mbus_dram_window *cs = dram->cs + i;
 94                 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
 95                         writel(cs->base & 0xffff0000,
 96                                 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
 97                         writel(((cs->size - 1) & 0xffff0000) |
 98                                 (cs->mbus_attr << 8) |
 99                                 (dram->mbus_dram_target_id << 4) | 1,
100                                 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
101                 }
102         }
103 }
104 
105 static int kirkwood_dma_open(struct snd_pcm_substream *substream)
106 {
107         int err;
108         struct snd_pcm_runtime *runtime = substream->runtime;
109         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
110         const struct mbus_dram_target_info *dram;
111         unsigned long addr;
112 
113         snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
114 
115         /* Ensure that all constraints linked to dma burst are fulfilled */
116         err = snd_pcm_hw_constraint_minmax(runtime,
117                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
118                         priv->burst * 2,
119                         KIRKWOOD_AUDIO_BUF_MAX-1);
120         if (err < 0)
121                 return err;
122 
123         err = snd_pcm_hw_constraint_step(runtime, 0,
124                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
125                         priv->burst);
126         if (err < 0)
127                 return err;
128 
129         err = snd_pcm_hw_constraint_step(substream->runtime, 0,
130                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
131                          priv->burst);
132         if (err < 0)
133                 return err;
134 
135         if (!priv->substream_play && !priv->substream_rec) {
136                 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
137                                   "kirkwood-i2s", priv);
138                 if (err)
139                         return -EBUSY;
140 
141                 /*
142                  * Enable Error interrupts. We're only ack'ing them but
143                  * it's useful for diagnostics
144                  */
145                 writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK);
146         }
147 
148         dram = mv_mbus_dram_info();
149         addr = substream->dma_buffer.addr;
150         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
151                 if (priv->substream_play)
152                         return -EBUSY;
153                 priv->substream_play = substream;
154                 kirkwood_dma_conf_mbus_windows(priv->io,
155                         KIRKWOOD_PLAYBACK_WIN, addr, dram);
156         } else {
157                 if (priv->substream_rec)
158                         return -EBUSY;
159                 priv->substream_rec = substream;
160                 kirkwood_dma_conf_mbus_windows(priv->io,
161                         KIRKWOOD_RECORD_WIN, addr, dram);
162         }
163 
164         return 0;
165 }
166 
167 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
168 {
169         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
170 
171         if (!priv)
172                 return 0;
173 
174         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
175                 priv->substream_play = NULL;
176         else
177                 priv->substream_rec = NULL;
178 
179         if (!priv->substream_play && !priv->substream_rec) {
180                 writel(0, priv->io + KIRKWOOD_ERR_MASK);
181                 free_irq(priv->irq, priv);
182         }
183 
184         return 0;
185 }
186 
187 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
188                                 struct snd_pcm_hw_params *params)
189 {
190         struct snd_pcm_runtime *runtime = substream->runtime;
191 
192         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
193         runtime->dma_bytes = params_buffer_bytes(params);
194 
195         return 0;
196 }
197 
198 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
199 {
200         snd_pcm_set_runtime_buffer(substream, NULL);
201         return 0;
202 }
203 
204 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
205 {
206         struct snd_pcm_runtime *runtime = substream->runtime;
207         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
208         unsigned long size, count;
209 
210         /* compute buffer size in term of "words" as requested in specs */
211         size = frames_to_bytes(runtime, runtime->buffer_size);
212         size = (size>>2)-1;
213         count = snd_pcm_lib_period_bytes(substream);
214 
215         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
216                 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
217                 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
218                 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
219         } else {
220                 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
221                 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
222                 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
223         }
224 
225 
226         return 0;
227 }
228 
229 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
230                                                 *substream)
231 {
232         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
233         snd_pcm_uframes_t count;
234 
235         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
236                 count = bytes_to_frames(substream->runtime,
237                         readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
238         else
239                 count = bytes_to_frames(substream->runtime,
240                         readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
241 
242         return count;
243 }
244 
245 static struct snd_pcm_ops kirkwood_dma_ops = {
246         .open =         kirkwood_dma_open,
247         .close =        kirkwood_dma_close,
248         .ioctl =        snd_pcm_lib_ioctl,
249         .hw_params =    kirkwood_dma_hw_params,
250         .hw_free =      kirkwood_dma_hw_free,
251         .prepare =      kirkwood_dma_prepare,
252         .pointer =      kirkwood_dma_pointer,
253 };
254 
255 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
256                 int stream)
257 {
258         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
259         struct snd_dma_buffer *buf = &substream->dma_buffer;
260         size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
261 
262         buf->dev.type = SNDRV_DMA_TYPE_DEV;
263         buf->dev.dev = pcm->card->dev;
264         buf->area = dma_alloc_coherent(pcm->card->dev, size,
265                         &buf->addr, GFP_KERNEL);
266         if (!buf->area)
267                 return -ENOMEM;
268         buf->bytes = size;
269         buf->private_data = NULL;
270 
271         return 0;
272 }
273 
274 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
275 {
276         struct snd_card *card = rtd->card->snd_card;
277         struct snd_pcm *pcm = rtd->pcm;
278         int ret;
279 
280         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
281         if (ret)
282                 return ret;
283 
284         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
285                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
286                                 SNDRV_PCM_STREAM_PLAYBACK);
287                 if (ret)
288                         return ret;
289         }
290 
291         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
292                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
293                                 SNDRV_PCM_STREAM_CAPTURE);
294                 if (ret)
295                         return ret;
296         }
297 
298         return 0;
299 }
300 
301 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
302 {
303         struct snd_pcm_substream *substream;
304         struct snd_dma_buffer *buf;
305         int stream;
306 
307         for (stream = 0; stream < 2; stream++) {
308                 substream = pcm->streams[stream].substream;
309                 if (!substream)
310                         continue;
311                 buf = &substream->dma_buffer;
312                 if (!buf->area)
313                         continue;
314 
315                 dma_free_coherent(pcm->card->dev, buf->bytes,
316                                 buf->area, buf->addr);
317                 buf->area = NULL;
318         }
319 }
320 
321 struct snd_soc_platform_driver kirkwood_soc_platform = {
322         .ops            = &kirkwood_dma_ops,
323         .pcm_new        = kirkwood_dma_new,
324         .pcm_free       = kirkwood_dma_free_dma_buffers,
325 };
326 

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