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)
34 static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs)
36 struct snd_soc_pcm_runtime *soc_runtime = subs->private_data;
37 return snd_soc_dai_get_drvdata(soc_runtime->cpu_dai);
40 static struct snd_pcm_hardware kirkwood_dma_snd_hw = {
41 .info = (SNDRV_PCM_INFO_INTERLEAVED |
43 SNDRV_PCM_INFO_MMAP_VALID |
44 SNDRV_PCM_INFO_BLOCK_TRANSFER |
45 SNDRV_PCM_INFO_PAUSE),
46 .formats = KIRKWOOD_FORMATS,
47 .rates = KIRKWOOD_RATES,
52 .buffer_bytes_max = KIRKWOOD_SND_MAX_BUFFER_BYTES,
53 .period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES,
54 .period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES,
55 .periods_min = KIRKWOOD_SND_MIN_PERIODS,
56 .periods_max = KIRKWOOD_SND_MAX_PERIODS,
60 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
62 struct kirkwood_dma_data *priv = dev_id;
63 unsigned long mask, status, cause;
65 mask = readl(priv->io + KIRKWOOD_INT_MASK);
66 status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
68 cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
69 if (unlikely(cause)) {
70 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
72 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
75 /* we've enabled only bytes interrupts ... */
76 if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
77 KIRKWOOD_INT_CAUSE_REC_BYTES)) {
78 printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
84 writel(status, priv->io + KIRKWOOD_INT_CAUSE);
86 if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
87 snd_pcm_period_elapsed(priv->substream_play);
89 if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
90 snd_pcm_period_elapsed(priv->substream_rec);
96 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
98 const struct mbus_dram_target_info *dram)
102 /* First disable and clear windows */
103 writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
104 writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
106 /* try to find matching cs for current dma address */
107 for (i = 0; i < dram->num_cs; i++) {
108 const struct mbus_dram_window *cs = dram->cs + i;
109 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
110 writel(cs->base & 0xffff0000,
111 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
112 writel(((cs->size - 1) & 0xffff0000) |
113 (cs->mbus_attr << 8) |
114 (dram->mbus_dram_target_id << 4) | 1,
115 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
120 static int kirkwood_dma_open(struct snd_pcm_substream *substream)
123 struct snd_pcm_runtime *runtime = substream->runtime;
124 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
125 const struct mbus_dram_target_info *dram;
128 snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
130 /* Ensure that all constraints linked to dma burst are fulfilled */
131 err = snd_pcm_hw_constraint_minmax(runtime,
132 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
134 KIRKWOOD_AUDIO_BUF_MAX-1);
138 err = snd_pcm_hw_constraint_step(runtime, 0,
139 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
144 err = snd_pcm_hw_constraint_step(substream->runtime, 0,
145 SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
150 if (!priv->substream_play && !priv->substream_rec) {
151 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
152 "kirkwood-i2s", priv);
157 * Enable Error interrupts. We're only ack'ing them but
158 * it's useful for diagnostics
160 writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK);
163 dram = mv_mbus_dram_info();
164 addr = substream->dma_buffer.addr;
165 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
166 priv->substream_play = substream;
167 kirkwood_dma_conf_mbus_windows(priv->io,
168 KIRKWOOD_PLAYBACK_WIN, addr, dram);
170 priv->substream_rec = substream;
171 kirkwood_dma_conf_mbus_windows(priv->io,
172 KIRKWOOD_RECORD_WIN, addr, dram);
178 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
180 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
185 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
186 priv->substream_play = NULL;
188 priv->substream_rec = NULL;
190 if (!priv->substream_play && !priv->substream_rec) {
191 writel(0, priv->io + KIRKWOOD_ERR_MASK);
192 free_irq(priv->irq, priv);
198 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
199 struct snd_pcm_hw_params *params)
201 struct snd_pcm_runtime *runtime = substream->runtime;
203 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
204 runtime->dma_bytes = params_buffer_bytes(params);
209 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
211 snd_pcm_set_runtime_buffer(substream, NULL);
215 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
217 struct snd_pcm_runtime *runtime = substream->runtime;
218 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
219 unsigned long size, count;
221 /* compute buffer size in term of "words" as requested in specs */
222 size = frames_to_bytes(runtime, runtime->buffer_size);
224 count = snd_pcm_lib_period_bytes(substream);
226 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
227 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
228 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
229 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
231 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
232 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
233 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
240 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
243 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
244 snd_pcm_uframes_t count;
246 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
247 count = bytes_to_frames(substream->runtime,
248 readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
250 count = bytes_to_frames(substream->runtime,
251 readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
256 static struct snd_pcm_ops kirkwood_dma_ops = {
257 .open = kirkwood_dma_open,
258 .close = kirkwood_dma_close,
259 .ioctl = snd_pcm_lib_ioctl,
260 .hw_params = kirkwood_dma_hw_params,
261 .hw_free = kirkwood_dma_hw_free,
262 .prepare = kirkwood_dma_prepare,
263 .pointer = kirkwood_dma_pointer,
266 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
269 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
270 struct snd_dma_buffer *buf = &substream->dma_buffer;
271 size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
273 buf->dev.type = SNDRV_DMA_TYPE_DEV;
274 buf->dev.dev = pcm->card->dev;
275 buf->area = dma_alloc_coherent(pcm->card->dev, size,
276 &buf->addr, GFP_KERNEL);
280 buf->private_data = NULL;
285 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
287 struct snd_card *card = rtd->card->snd_card;
288 struct snd_pcm *pcm = rtd->pcm;
291 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
295 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
296 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
297 SNDRV_PCM_STREAM_PLAYBACK);
302 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
303 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
304 SNDRV_PCM_STREAM_CAPTURE);
312 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
314 struct snd_pcm_substream *substream;
315 struct snd_dma_buffer *buf;
318 for (stream = 0; stream < 2; stream++) {
319 substream = pcm->streams[stream].substream;
322 buf = &substream->dma_buffer;
326 dma_free_coherent(pcm->card->dev, buf->bytes,
327 buf->area, buf->addr);
332 struct snd_soc_platform_driver kirkwood_soc_platform = {
333 .ops = &kirkwood_dma_ops,
334 .pcm_new = kirkwood_dma_new,
335 .pcm_free = kirkwood_dma_free_dma_buffers,