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-rw-r--r--sound/soc/kirkwood/kirkwood-dma.c383
1 files changed, 383 insertions, 0 deletions
diff --git a/sound/soc/kirkwood/kirkwood-dma.c b/sound/soc/kirkwood/kirkwood-dma.c
new file mode 100644
index 000000000000..a30205be3e2b
--- /dev/null
+++ b/sound/soc/kirkwood/kirkwood-dma.c
@@ -0,0 +1,383 @@
1/*
2 * kirkwood-dma.c
3 *
4 * (c) 2010 Arnaud Patard <apatard@mandriva.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 */
11
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/device.h>
15#include <linux/io.h>
16#include <linux/slab.h>
17#include <linux/interrupt.h>
18#include <linux/dma-mapping.h>
19#include <linux/mbus.h>
20#include <sound/soc.h>
21#include "kirkwood-dma.h"
22#include "kirkwood.h"
23
24#define KIRKWOOD_RATES \
25 (SNDRV_PCM_RATE_44100 | \
26 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
27#define KIRKWOOD_FORMATS \
28 (SNDRV_PCM_FMTBIT_S16_LE | \
29 SNDRV_PCM_FMTBIT_S24_LE | \
30 SNDRV_PCM_FMTBIT_S32_LE)
31
32struct kirkwood_dma_priv {
33 struct snd_pcm_substream *play_stream;
34 struct snd_pcm_substream *rec_stream;
35 struct kirkwood_dma_data *data;
36};
37
38static struct snd_pcm_hardware kirkwood_dma_snd_hw = {
39 .info = (SNDRV_PCM_INFO_INTERLEAVED |
40 SNDRV_PCM_INFO_MMAP |
41 SNDRV_PCM_INFO_MMAP_VALID |
42 SNDRV_PCM_INFO_BLOCK_TRANSFER |
43 SNDRV_PCM_INFO_PAUSE),
44 .formats = KIRKWOOD_FORMATS,
45 .rates = KIRKWOOD_RATES,
46 .rate_min = 44100,
47 .rate_max = 96000,
48 .channels_min = 1,
49 .channels_max = 2,
50 .buffer_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES * KIRKWOOD_SND_MAX_PERIODS,
51 .period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES,
52 .period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES,
53 .periods_min = KIRKWOOD_SND_MIN_PERIODS,
54 .periods_max = KIRKWOOD_SND_MAX_PERIODS,
55 .fifo_size = 0,
56};
57
58static u64 kirkwood_dma_dmamask = 0xFFFFFFFFUL;
59
60static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
61{
62 struct kirkwood_dma_priv *prdata = dev_id;
63 struct kirkwood_dma_data *priv = prdata->data;
64 unsigned long mask, status, cause;
65
66 mask = readl(priv->io + KIRKWOOD_INT_MASK);
67 status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
68
69 cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
70 if (unlikely(cause)) {
71 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
72 __func__, cause);
73 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
74 return IRQ_HANDLED;
75 }
76
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",
81 __func__, status);
82 return IRQ_NONE;
83 }
84
85 /* ack int */
86 writel(status, priv->io + KIRKWOOD_INT_CAUSE);
87
88 if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
89 snd_pcm_period_elapsed(prdata->play_stream);
90
91 if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
92 snd_pcm_period_elapsed(prdata->rec_stream);
93
94 return IRQ_HANDLED;
95}
96
97static void kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
98 unsigned long dma,
99 struct mbus_dram_target_info *dram)
100{
101 int i;
102
103 /* First disable and clear windows */
104 writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
105 writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
106
107 /* try to find matching cs for current dma address */
108 for (i = 0; i < dram->num_cs; i++) {
109 struct mbus_dram_window *cs = dram->cs + i;
110 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
111 writel(cs->base & 0xffff0000,
112 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
113 writel(((cs->size - 1) & 0xffff0000) |
114 (cs->mbus_attr << 8) |
115 (dram->mbus_dram_target_id << 4) | 1,
116 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
117 }
118 }
119}
120
121static int kirkwood_dma_open(struct snd_pcm_substream *substream)
122{
123 int err;
124 struct snd_pcm_runtime *runtime = substream->runtime;
125 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
126 struct snd_soc_dai *cpu_dai = soc_runtime->dai->cpu_dai;
127 struct kirkwood_dma_data *priv;
128 struct kirkwood_dma_priv *prdata = cpu_dai->private_data;
129 unsigned long addr;
130
131 priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
132 snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
133
134 /* Ensure that all constraints linked to dma burst are fullfilled */
135 err = snd_pcm_hw_constraint_minmax(runtime,
136 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
137 priv->burst * 2,
138 KIRKWOOD_AUDIO_BUF_MAX-1);
139 if (err < 0)
140 return err;
141
142 err = snd_pcm_hw_constraint_step(runtime, 0,
143 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
144 priv->burst);
145 if (err < 0)
146 return err;
147
148 err = snd_pcm_hw_constraint_step(substream->runtime, 0,
149 SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
150 priv->burst);
151 if (err < 0)
152 return err;
153
154 if (soc_runtime->dai->cpu_dai->private_data == NULL) {
155 prdata = kzalloc(sizeof(struct kirkwood_dma_priv), GFP_KERNEL);
156 if (prdata == NULL)
157 return -ENOMEM;
158
159 prdata->data = priv;
160
161 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
162 "kirkwood-i2s", prdata);
163 if (err) {
164 kfree(prdata);
165 return -EBUSY;
166 }
167
168 soc_runtime->dai->cpu_dai->private_data = prdata;
169
170 /*
171 * Enable Error interrupts. We're only ack'ing them but
172 * it's usefull for diagnostics
173 */
174 writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK);
175 }
176
177 addr = virt_to_phys(substream->dma_buffer.area);
178 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
179 prdata->play_stream = substream;
180 kirkwood_dma_conf_mbus_windows(priv->io,
181 KIRKWOOD_PLAYBACK_WIN, addr, priv->dram);
182 } else {
183 prdata->rec_stream = substream;
184 kirkwood_dma_conf_mbus_windows(priv->io,
185 KIRKWOOD_RECORD_WIN, addr, priv->dram);
186 }
187
188 return 0;
189}
190
191static int kirkwood_dma_close(struct snd_pcm_substream *substream)
192{
193 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
194 struct snd_soc_dai *cpu_dai = soc_runtime->dai->cpu_dai;
195 struct kirkwood_dma_priv *prdata = cpu_dai->private_data;
196 struct kirkwood_dma_data *priv;
197
198 priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
199
200 if (!prdata || !priv)
201 return 0;
202
203 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
204 prdata->play_stream = NULL;
205 else
206 prdata->rec_stream = NULL;
207
208 if (!prdata->play_stream && !prdata->rec_stream) {
209 writel(0, priv->io + KIRKWOOD_ERR_MASK);
210 free_irq(priv->irq, prdata);
211 kfree(prdata);
212 soc_runtime->dai->cpu_dai->private_data = NULL;
213 }
214
215 return 0;
216}
217
218static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
219 struct snd_pcm_hw_params *params)
220{
221 struct snd_pcm_runtime *runtime = substream->runtime;
222
223 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
224 runtime->dma_bytes = params_buffer_bytes(params);
225
226 return 0;
227}
228
229static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
230{
231 snd_pcm_set_runtime_buffer(substream, NULL);
232 return 0;
233}
234
235static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
236{
237 struct snd_pcm_runtime *runtime = substream->runtime;
238 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
239 struct snd_soc_dai *cpu_dai = soc_runtime->dai->cpu_dai;
240 struct kirkwood_dma_data *priv;
241 unsigned long size, count;
242
243 priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
244
245 /* compute buffer size in term of "words" as requested in specs */
246 size = frames_to_bytes(runtime, runtime->buffer_size);
247 size = (size>>2)-1;
248 count = snd_pcm_lib_period_bytes(substream);
249
250 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
251 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
252 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
253 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
254 } else {
255 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
256 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
257 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
258 }
259
260
261 return 0;
262}
263
264static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
265 *substream)
266{
267 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
268 struct snd_soc_dai *cpu_dai = soc_runtime->dai->cpu_dai;
269 struct kirkwood_dma_data *priv;
270 snd_pcm_uframes_t count;
271
272 priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
273
274 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
275 count = bytes_to_frames(substream->runtime,
276 readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
277 else
278 count = bytes_to_frames(substream->runtime,
279 readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
280
281 return count;
282}
283
284struct snd_pcm_ops kirkwood_dma_ops = {
285 .open = kirkwood_dma_open,
286 .close = kirkwood_dma_close,
287 .ioctl = snd_pcm_lib_ioctl,
288 .hw_params = kirkwood_dma_hw_params,
289 .hw_free = kirkwood_dma_hw_free,
290 .prepare = kirkwood_dma_prepare,
291 .pointer = kirkwood_dma_pointer,
292};
293
294static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
295 int stream)
296{
297 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
298 struct snd_dma_buffer *buf = &substream->dma_buffer;
299 size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
300
301 buf->dev.type = SNDRV_DMA_TYPE_DEV;
302 buf->dev.dev = pcm->card->dev;
303 buf->area = dma_alloc_coherent(pcm->card->dev, size,
304 &buf->addr, GFP_KERNEL);
305 if (!buf->area)
306 return -ENOMEM;
307 buf->bytes = size;
308 buf->private_data = NULL;
309
310 return 0;
311}
312
313static int kirkwood_dma_new(struct snd_card *card,
314 struct snd_soc_dai *dai, struct snd_pcm *pcm)
315{
316 int ret;
317
318 if (!card->dev->dma_mask)
319 card->dev->dma_mask = &kirkwood_dma_dmamask;
320 if (!card->dev->coherent_dma_mask)
321 card->dev->coherent_dma_mask = 0xffffffff;
322
323 if (dai->playback.channels_min) {
324 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
325 SNDRV_PCM_STREAM_PLAYBACK);
326 if (ret)
327 return ret;
328 }
329
330 if (dai->capture.channels_min) {
331 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
332 SNDRV_PCM_STREAM_CAPTURE);
333 if (ret)
334 return ret;
335 }
336
337 return 0;
338}
339
340static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
341{
342 struct snd_pcm_substream *substream;
343 struct snd_dma_buffer *buf;
344 int stream;
345
346 for (stream = 0; stream < 2; stream++) {
347 substream = pcm->streams[stream].substream;
348 if (!substream)
349 continue;
350 buf = &substream->dma_buffer;
351 if (!buf->area)
352 continue;
353
354 dma_free_coherent(pcm->card->dev, buf->bytes,
355 buf->area, buf->addr);
356 buf->area = NULL;
357 }
358}
359
360struct snd_soc_platform kirkwood_soc_platform = {
361 .name = "kirkwood-dma",
362 .pcm_ops = &kirkwood_dma_ops,
363 .pcm_new = kirkwood_dma_new,
364 .pcm_free = kirkwood_dma_free_dma_buffers,
365};
366EXPORT_SYMBOL_GPL(kirkwood_soc_platform);
367
368static int __init kirkwood_soc_platform_init(void)
369{
370 return snd_soc_register_platform(&kirkwood_soc_platform);
371}
372module_init(kirkwood_soc_platform_init);
373
374static void __exit kirkwood_soc_platform_exit(void)
375{
376 snd_soc_unregister_platform(&kirkwood_soc_platform);
377}
378module_exit(kirkwood_soc_platform_exit);
379
380MODULE_AUTHOR("Arnaud Patard <apatard@mandriva.com>");
381MODULE_DESCRIPTION("Marvell Kirkwood Audio DMA module");
382MODULE_LICENSE("GPL");
383
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-11 22:05:59 -0500