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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#define KIRKWOOD_RATES \
25 (SNDRV_PCM_RATE_8000_192000 | \
26 SNDRV_PCM_RATE_CONTINUOUS | \
27 SNDRV_PCM_RATE_KNOT)
28
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)
35
36static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs)
37{
38 struct snd_soc_pcm_runtime *soc_runtime = subs->private_data;
39 return snd_soc_dai_get_drvdata(soc_runtime->cpu_dai);
40}
41
42static struct snd_pcm_hardware kirkwood_dma_snd_hw = {
43 .info = (SNDRV_PCM_INFO_INTERLEAVED |
44 SNDRV_PCM_INFO_MMAP |
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,
50 .rate_min = 8000,
51 .rate_max = 384000,
52 .channels_min = 1,
53 .channels_max = 8,
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,
59 .fifo_size = 0,
60};
61
62static u64 kirkwood_dma_dmamask = DMA_BIT_MASK(32);
63
64static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
65{
66 struct kirkwood_dma_data *priv = dev_id;
67 unsigned long mask, status, cause;
68
69 mask = readl(priv->io + KIRKWOOD_INT_MASK);
70 status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
71
72 cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
73 if (unlikely(cause)) {
74 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
75 __func__, cause);
76 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
77 }
78
79
80 if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
81 KIRKWOOD_INT_CAUSE_REC_BYTES)) {
82 printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
83 __func__, status);
84 return IRQ_NONE;
85 }
86
87
88 writel(status, priv->io + KIRKWOOD_INT_CAUSE);
89
90 if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
91 snd_pcm_period_elapsed(priv->substream_play);
92
93 if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
94 snd_pcm_period_elapsed(priv->substream_rec);
95
96 return IRQ_HANDLED;
97}
98
99static void
100kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
101 unsigned long dma,
102 const struct mbus_dram_target_info *dram)
103{
104 int i;
105
106
107 writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
108 writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
109
110
111 for (i = 0; i < dram->num_cs; i++) {
112 const struct mbus_dram_window *cs = dram->cs + i;
113 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
114 writel(cs->base & 0xffff0000,
115 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
116 writel(((cs->size - 1) & 0xffff0000) |
117 (cs->mbus_attr << 8) |
118 (dram->mbus_dram_target_id << 4) | 1,
119 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
120 }
121 }
122}
123
124static int kirkwood_dma_open(struct snd_pcm_substream *substream)
125{
126 int err;
127 struct snd_pcm_runtime *runtime = substream->runtime;
128 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
129 const struct mbus_dram_target_info *dram;
130 unsigned long addr;
131
132 snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
133
134
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 (!priv->substream_play && !priv->substream_rec) {
155 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
156 "kirkwood-i2s", priv);
157 if (err)
158 return -EBUSY;
159
160
161
162
163
164 writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK);
165 }
166
167 dram = mv_mbus_dram_info();
168 addr = substream->dma_buffer.addr;
169 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
170 priv->substream_play = substream;
171 kirkwood_dma_conf_mbus_windows(priv->io,
172 KIRKWOOD_PLAYBACK_WIN, addr, dram);
173 } else {
174 priv->substream_rec = substream;
175 kirkwood_dma_conf_mbus_windows(priv->io,
176 KIRKWOOD_RECORD_WIN, addr, dram);
177 }
178
179 return 0;
180}
181
182static int kirkwood_dma_close(struct snd_pcm_substream *substream)
183{
184 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
185
186 if (!priv)
187 return 0;
188
189 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
190 priv->substream_play = NULL;
191 else
192 priv->substream_rec = NULL;
193
194 if (!priv->substream_play && !priv->substream_rec) {
195 writel(0, priv->io + KIRKWOOD_ERR_MASK);
196 free_irq(priv->irq, priv);
197 }
198
199 return 0;
200}
201
202static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
203 struct snd_pcm_hw_params *params)
204{
205 struct snd_pcm_runtime *runtime = substream->runtime;
206
207 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
208 runtime->dma_bytes = params_buffer_bytes(params);
209
210 return 0;
211}
212
213static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
214{
215 snd_pcm_set_runtime_buffer(substream, NULL);
216 return 0;
217}
218
219static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
220{
221 struct snd_pcm_runtime *runtime = substream->runtime;
222 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
223 unsigned long size, count;
224
225
226 size = frames_to_bytes(runtime, runtime->buffer_size);
227 size = (size>>2)-1;
228 count = snd_pcm_lib_period_bytes(substream);
229
230 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
231 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
232 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
233 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
234 } else {
235 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
236 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
237 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
238 }
239
240
241 return 0;
242}
243
244static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
245 *substream)
246{
247 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
248 snd_pcm_uframes_t count;
249
250 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
251 count = bytes_to_frames(substream->runtime,
252 readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
253 else
254 count = bytes_to_frames(substream->runtime,
255 readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
256
257 return count;
258}
259
260static struct snd_pcm_ops kirkwood_dma_ops = {
261 .open = kirkwood_dma_open,
262 .close = kirkwood_dma_close,
263 .ioctl = snd_pcm_lib_ioctl,
264 .hw_params = kirkwood_dma_hw_params,
265 .hw_free = kirkwood_dma_hw_free,
266 .prepare = kirkwood_dma_prepare,
267 .pointer = kirkwood_dma_pointer,
268};
269
270static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
271 int stream)
272{
273 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
274 struct snd_dma_buffer *buf = &substream->dma_buffer;
275 size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
276
277 buf->dev.type = SNDRV_DMA_TYPE_DEV;
278 buf->dev.dev = pcm->card->dev;
279 buf->area = dma_alloc_coherent(pcm->card->dev, size,
280 &buf->addr, GFP_KERNEL);
281 if (!buf->area)
282 return -ENOMEM;
283 buf->bytes = size;
284 buf->private_data = NULL;
285
286 return 0;
287}
288
289static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
290{
291 struct snd_card *card = rtd->card->snd_card;
292 struct snd_pcm *pcm = rtd->pcm;
293 int ret;
294
295 if (!card->dev->dma_mask)
296 card->dev->dma_mask = &kirkwood_dma_dmamask;
297 if (!card->dev->coherent_dma_mask)
298 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
299
300 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
301 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
302 SNDRV_PCM_STREAM_PLAYBACK);
303 if (ret)
304 return ret;
305 }
306
307 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
308 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
309 SNDRV_PCM_STREAM_CAPTURE);
310 if (ret)
311 return ret;
312 }
313
314 return 0;
315}
316
317static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
318{
319 struct snd_pcm_substream *substream;
320 struct snd_dma_buffer *buf;
321 int stream;
322
323 for (stream = 0; stream < 2; stream++) {
324 substream = pcm->streams[stream].substream;
325 if (!substream)
326 continue;
327 buf = &substream->dma_buffer;
328 if (!buf->area)
329 continue;
330
331 dma_free_coherent(pcm->card->dev, buf->bytes,
332 buf->area, buf->addr);
333 buf->area = NULL;
334 }
335}
336
337struct snd_soc_platform_driver kirkwood_soc_platform = {
338 .ops = &kirkwood_dma_ops,
339 .pcm_new = kirkwood_dma_new,
340 .pcm_free = kirkwood_dma_free_dma_buffers,
341};
342
