4 * (c) 2010 Arnaud Patard <apatard@mandriva.com>
5 * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
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.
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/device.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>
24 #define KIRKWOOD_RATES \
25 (SNDRV_PCM_RATE_8000_192000 | \
26 SNDRV_PCM_RATE_CONTINUOUS | \
29 #define KIRKWOOD_FORMATS \
30 (SNDRV_PCM_FMTBIT_S16_LE | \
31 SNDRV_PCM_FMTBIT_S24_LE | \
32 SNDRV_PCM_FMTBIT_S32_LE | \
33 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE | \
34 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE)
36 static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs)
38 struct snd_soc_pcm_runtime *soc_runtime = subs->private_data;
39 return snd_soc_dai_get_drvdata(soc_runtime->cpu_dai);
42 static struct snd_pcm_hardware kirkwood_dma_snd_hw = {
43 .info = (SNDRV_PCM_INFO_INTERLEAVED |
45 SNDRV_PCM_INFO_MMAP_VALID |
46 SNDRV_PCM_INFO_BLOCK_TRANSFER |
47 SNDRV_PCM_INFO_PAUSE),
48 .formats = KIRKWOOD_FORMATS,
49 .rates = KIRKWOOD_RATES,
54 .buffer_bytes_max = KIRKWOOD_SND_MAX_BUFFER_BYTES,
55 .period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES,
56 .period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES,
57 .periods_min = KIRKWOOD_SND_MIN_PERIODS,
58 .periods_max = KIRKWOOD_SND_MAX_PERIODS,
62 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
64 struct kirkwood_dma_data *priv = dev_id;
65 unsigned long mask, status, cause;
67 mask = readl(priv->io + KIRKWOOD_INT_MASK);
68 status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
70 cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
71 if (unlikely(cause)) {
72 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
74 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
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",
86 writel(status, priv->io + KIRKWOOD_INT_CAUSE);
88 if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
89 snd_pcm_period_elapsed(priv->substream_play);
91 if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
92 snd_pcm_period_elapsed(priv->substream_rec);
98 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
100 const struct mbus_dram_target_info *dram)
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));
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));
122 static int kirkwood_dma_open(struct snd_pcm_substream *substream)
125 struct snd_pcm_runtime *runtime = substream->runtime;
126 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
127 const struct mbus_dram_target_info *dram;
130 snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
132 /* Ensure that all constraints linked to dma burst are fulfilled */
133 err = snd_pcm_hw_constraint_minmax(runtime,
134 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
136 KIRKWOOD_AUDIO_BUF_MAX-1);
140 err = snd_pcm_hw_constraint_step(runtime, 0,
141 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
146 err = snd_pcm_hw_constraint_step(substream->runtime, 0,
147 SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
152 if (!priv->substream_play && !priv->substream_rec) {
153 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
154 "kirkwood-i2s", priv);
159 * Enable Error interrupts. We're only ack'ing them but
160 * it's useful for diagnostics
162 writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK);
165 dram = mv_mbus_dram_info();
166 addr = substream->dma_buffer.addr;
167 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
168 priv->substream_play = substream;
169 kirkwood_dma_conf_mbus_windows(priv->io,
170 KIRKWOOD_PLAYBACK_WIN, addr, dram);
172 priv->substream_rec = substream;
173 kirkwood_dma_conf_mbus_windows(priv->io,
174 KIRKWOOD_RECORD_WIN, addr, dram);
180 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
182 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
187 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
188 priv->substream_play = NULL;
190 priv->substream_rec = NULL;
192 if (!priv->substream_play && !priv->substream_rec) {
193 writel(0, priv->io + KIRKWOOD_ERR_MASK);
194 free_irq(priv->irq, priv);
200 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
201 struct snd_pcm_hw_params *params)
203 struct snd_pcm_runtime *runtime = substream->runtime;
205 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
206 runtime->dma_bytes = params_buffer_bytes(params);
211 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
213 snd_pcm_set_runtime_buffer(substream, NULL);
217 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
219 struct snd_pcm_runtime *runtime = substream->runtime;
220 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
221 unsigned long size, count;
223 /* compute buffer size in term of "words" as requested in specs */
224 size = frames_to_bytes(runtime, runtime->buffer_size);
226 count = snd_pcm_lib_period_bytes(substream);
228 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
229 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
230 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
231 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
233 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
234 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
235 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
242 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
245 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
246 snd_pcm_uframes_t count;
248 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
249 count = bytes_to_frames(substream->runtime,
250 readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
252 count = bytes_to_frames(substream->runtime,
253 readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
258 static struct snd_pcm_ops kirkwood_dma_ops = {
259 .open = kirkwood_dma_open,
260 .close = kirkwood_dma_close,
261 .ioctl = snd_pcm_lib_ioctl,
262 .hw_params = kirkwood_dma_hw_params,
263 .hw_free = kirkwood_dma_hw_free,
264 .prepare = kirkwood_dma_prepare,
265 .pointer = kirkwood_dma_pointer,
268 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
271 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
272 struct snd_dma_buffer *buf = &substream->dma_buffer;
273 size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
275 buf->dev.type = SNDRV_DMA_TYPE_DEV;
276 buf->dev.dev = pcm->card->dev;
277 buf->area = dma_alloc_coherent(pcm->card->dev, size,
278 &buf->addr, GFP_KERNEL);
282 buf->private_data = NULL;
287 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
289 struct snd_card *card = rtd->card->snd_card;
290 struct snd_pcm *pcm = rtd->pcm;
293 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
297 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
298 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
299 SNDRV_PCM_STREAM_PLAYBACK);
304 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
305 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
306 SNDRV_PCM_STREAM_CAPTURE);
314 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
316 struct snd_pcm_substream *substream;
317 struct snd_dma_buffer *buf;
320 for (stream = 0; stream < 2; stream++) {
321 substream = pcm->streams[stream].substream;
324 buf = &substream->dma_buffer;
328 dma_free_coherent(pcm->card->dev, buf->bytes,
329 buf->area, buf->addr);
334 struct snd_soc_platform_driver kirkwood_soc_platform = {
335 .ops = &kirkwood_dma_ops,
336 .pcm_new = kirkwood_dma_new,
337 .pcm_free = kirkwood_dma_free_dma_buffers,