1 // SPDX-License-Identifier: GPL-2.0-or-later
5 * (c) 2010 Arnaud Patard <apatard@mandriva.com>
6 * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
9 #include <linux/init.h>
10 #include <linux/module.h>
11 #include <linux/device.h>
13 #include <linux/slab.h>
14 #include <linux/interrupt.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/mbus.h>
17 #include <sound/soc.h>
20 static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs)
22 struct snd_soc_pcm_runtime *soc_runtime = subs->private_data;
23 return snd_soc_dai_get_drvdata(soc_runtime->cpu_dai);
26 static const struct snd_pcm_hardware kirkwood_dma_snd_hw = {
27 .info = SNDRV_PCM_INFO_INTERLEAVED |
29 SNDRV_PCM_INFO_MMAP_VALID |
30 SNDRV_PCM_INFO_BLOCK_TRANSFER |
31 SNDRV_PCM_INFO_PAUSE |
32 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
33 .buffer_bytes_max = KIRKWOOD_SND_MAX_BUFFER_BYTES,
34 .period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES,
35 .period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES,
36 .periods_min = KIRKWOOD_SND_MIN_PERIODS,
37 .periods_max = KIRKWOOD_SND_MAX_PERIODS,
41 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
43 struct kirkwood_dma_data *priv = dev_id;
44 unsigned long mask, status, cause;
46 mask = readl(priv->io + KIRKWOOD_INT_MASK);
47 status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
49 cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
50 if (unlikely(cause)) {
51 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
53 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
56 /* we've enabled only bytes interrupts ... */
57 if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
58 KIRKWOOD_INT_CAUSE_REC_BYTES)) {
59 printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
65 writel(status, priv->io + KIRKWOOD_INT_CAUSE);
67 if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
68 snd_pcm_period_elapsed(priv->substream_play);
70 if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
71 snd_pcm_period_elapsed(priv->substream_rec);
77 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
79 const struct mbus_dram_target_info *dram)
83 /* First disable and clear windows */
84 writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
85 writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
87 /* try to find matching cs for current dma address */
88 for (i = 0; i < dram->num_cs; i++) {
89 const struct mbus_dram_window *cs = dram->cs + i;
90 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
91 writel(cs->base & 0xffff0000,
92 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
93 writel(((cs->size - 1) & 0xffff0000) |
94 (cs->mbus_attr << 8) |
95 (dram->mbus_dram_target_id << 4) | 1,
96 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
101 static int kirkwood_dma_open(struct snd_pcm_substream *substream)
104 struct snd_pcm_runtime *runtime = substream->runtime;
105 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
106 const struct mbus_dram_target_info *dram;
109 snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
111 /* Ensure that all constraints linked to dma burst are fulfilled */
112 err = snd_pcm_hw_constraint_minmax(runtime,
113 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
115 KIRKWOOD_AUDIO_BUF_MAX-1);
119 err = snd_pcm_hw_constraint_step(runtime, 0,
120 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
125 err = snd_pcm_hw_constraint_step(substream->runtime, 0,
126 SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
131 if (!priv->substream_play && !priv->substream_rec) {
132 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
133 "kirkwood-i2s", priv);
138 * Enable Error interrupts. We're only ack'ing them but
139 * it's useful for diagnostics
141 writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK);
144 dram = mv_mbus_dram_info();
145 addr = substream->dma_buffer.addr;
146 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
147 if (priv->substream_play)
149 priv->substream_play = substream;
150 kirkwood_dma_conf_mbus_windows(priv->io,
151 KIRKWOOD_PLAYBACK_WIN, addr, dram);
153 if (priv->substream_rec)
155 priv->substream_rec = substream;
156 kirkwood_dma_conf_mbus_windows(priv->io,
157 KIRKWOOD_RECORD_WIN, addr, dram);
163 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
165 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
170 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
171 priv->substream_play = NULL;
173 priv->substream_rec = NULL;
175 if (!priv->substream_play && !priv->substream_rec) {
176 writel(0, priv->io + KIRKWOOD_ERR_MASK);
177 free_irq(priv->irq, priv);
183 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
184 struct snd_pcm_hw_params *params)
186 struct snd_pcm_runtime *runtime = substream->runtime;
188 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
189 runtime->dma_bytes = params_buffer_bytes(params);
194 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
196 snd_pcm_set_runtime_buffer(substream, NULL);
200 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
202 struct snd_pcm_runtime *runtime = substream->runtime;
203 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
204 unsigned long size, count;
206 /* compute buffer size in term of "words" as requested in specs */
207 size = frames_to_bytes(runtime, runtime->buffer_size);
209 count = snd_pcm_lib_period_bytes(substream);
211 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
212 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
213 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
214 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
216 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
217 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
218 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
225 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
228 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
229 snd_pcm_uframes_t count;
231 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
232 count = bytes_to_frames(substream->runtime,
233 readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
235 count = bytes_to_frames(substream->runtime,
236 readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
241 static const struct snd_pcm_ops kirkwood_dma_ops = {
242 .open = kirkwood_dma_open,
243 .close = kirkwood_dma_close,
244 .ioctl = snd_pcm_lib_ioctl,
245 .hw_params = kirkwood_dma_hw_params,
246 .hw_free = kirkwood_dma_hw_free,
247 .prepare = kirkwood_dma_prepare,
248 .pointer = kirkwood_dma_pointer,
251 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
254 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
255 struct snd_dma_buffer *buf = &substream->dma_buffer;
256 size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
258 buf->dev.type = SNDRV_DMA_TYPE_DEV;
259 buf->dev.dev = pcm->card->dev;
260 buf->area = dma_alloc_coherent(pcm->card->dev, size,
261 &buf->addr, GFP_KERNEL);
265 buf->private_data = NULL;
270 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
272 struct snd_card *card = rtd->card->snd_card;
273 struct snd_pcm *pcm = rtd->pcm;
276 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
280 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
281 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
282 SNDRV_PCM_STREAM_PLAYBACK);
287 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
288 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
289 SNDRV_PCM_STREAM_CAPTURE);
297 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
299 struct snd_pcm_substream *substream;
300 struct snd_dma_buffer *buf;
303 for (stream = 0; stream < 2; stream++) {
304 substream = pcm->streams[stream].substream;
307 buf = &substream->dma_buffer;
311 dma_free_coherent(pcm->card->dev, buf->bytes,
312 buf->area, buf->addr);
317 const struct snd_soc_component_driver kirkwood_soc_component = {
319 .ops = &kirkwood_dma_ops,
320 .pcm_new = kirkwood_dma_new,
321 .pcm_free = kirkwood_dma_free_dma_buffers,