1
2
3
4
5
6
7
8
9#include <linux/init.h>
10#include <linux/module.h>
11#include <linux/device.h>
12#include <linux/io.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>
18#include "kirkwood.h"
19
20static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs)
21{
22 struct snd_soc_pcm_runtime *soc_runtime = subs->private_data;
23 return snd_soc_dai_get_drvdata(soc_runtime->cpu_dai);
24}
25
26static const struct snd_pcm_hardware kirkwood_dma_snd_hw = {
27 .info = SNDRV_PCM_INFO_INTERLEAVED |
28 SNDRV_PCM_INFO_MMAP |
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,
38 .fifo_size = 0,
39};
40
41static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
42{
43 struct kirkwood_dma_data *priv = dev_id;
44 unsigned long mask, status, cause;
45
46 mask = readl(priv->io + KIRKWOOD_INT_MASK);
47 status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
48
49 cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
50 if (unlikely(cause)) {
51 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
52 __func__, cause);
53 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
54 }
55
56
57 if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
58 KIRKWOOD_INT_CAUSE_REC_BYTES)) {
59 printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
60 __func__, status);
61 return IRQ_NONE;
62 }
63
64
65 writel(status, priv->io + KIRKWOOD_INT_CAUSE);
66
67 if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
68 snd_pcm_period_elapsed(priv->substream_play);
69
70 if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
71 snd_pcm_period_elapsed(priv->substream_rec);
72
73 return IRQ_HANDLED;
74}
75
76static void
77kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
78 unsigned long dma,
79 const struct mbus_dram_target_info *dram)
80{
81 int i;
82
83
84 writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
85 writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
86
87
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));
97 }
98 }
99}
100
101static int kirkwood_dma_open(struct snd_pcm_substream *substream)
102{
103 int err;
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;
107 unsigned long addr;
108
109 snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
110
111
112 err = snd_pcm_hw_constraint_minmax(runtime,
113 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
114 priv->burst * 2,
115 KIRKWOOD_AUDIO_BUF_MAX-1);
116 if (err < 0)
117 return err;
118
119 err = snd_pcm_hw_constraint_step(runtime, 0,
120 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
121 priv->burst);
122 if (err < 0)
123 return err;
124
125 err = snd_pcm_hw_constraint_step(substream->runtime, 0,
126 SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
127 priv->burst);
128 if (err < 0)
129 return err;
130
131 if (!priv->substream_play && !priv->substream_rec) {
132 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
133 "kirkwood-i2s", priv);
134 if (err)
135 return -EBUSY;
136
137
138
139
140
141 writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK);
142 }
143
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)
148 return -EBUSY;
149 priv->substream_play = substream;
150 kirkwood_dma_conf_mbus_windows(priv->io,
151 KIRKWOOD_PLAYBACK_WIN, addr, dram);
152 } else {
153 if (priv->substream_rec)
154 return -EBUSY;
155 priv->substream_rec = substream;
156 kirkwood_dma_conf_mbus_windows(priv->io,
157 KIRKWOOD_RECORD_WIN, addr, dram);
158 }
159
160 return 0;
161}
162
163static int kirkwood_dma_close(struct snd_pcm_substream *substream)
164{
165 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
166
167 if (!priv)
168 return 0;
169
170 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
171 priv->substream_play = NULL;
172 else
173 priv->substream_rec = NULL;
174
175 if (!priv->substream_play && !priv->substream_rec) {
176 writel(0, priv->io + KIRKWOOD_ERR_MASK);
177 free_irq(priv->irq, priv);
178 }
179
180 return 0;
181}
182
183static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
184 struct snd_pcm_hw_params *params)
185{
186 struct snd_pcm_runtime *runtime = substream->runtime;
187
188 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
189 runtime->dma_bytes = params_buffer_bytes(params);
190
191 return 0;
192}
193
194static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
195{
196 snd_pcm_set_runtime_buffer(substream, NULL);
197 return 0;
198}
199
200static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
201{
202 struct snd_pcm_runtime *runtime = substream->runtime;
203 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
204 unsigned long size, count;
205
206
207 size = frames_to_bytes(runtime, runtime->buffer_size);
208 size = (size>>2)-1;
209 count = snd_pcm_lib_period_bytes(substream);
210
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);
215 } else {
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);
219 }
220
221
222 return 0;
223}
224
225static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
226 *substream)
227{
228 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
229 snd_pcm_uframes_t count;
230
231 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
232 count = bytes_to_frames(substream->runtime,
233 readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
234 else
235 count = bytes_to_frames(substream->runtime,
236 readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
237
238 return count;
239}
240
241static 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,
249};
250
251static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
252 int stream)
253{
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;
257
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);
262 if (!buf->area)
263 return -ENOMEM;
264 buf->bytes = size;
265 buf->private_data = NULL;
266
267 return 0;
268}
269
270static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
271{
272 struct snd_card *card = rtd->card->snd_card;
273 struct snd_pcm *pcm = rtd->pcm;
274 int ret;
275
276 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
277 if (ret)
278 return ret;
279
280 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
281 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
282 SNDRV_PCM_STREAM_PLAYBACK);
283 if (ret)
284 return ret;
285 }
286
287 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
288 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
289 SNDRV_PCM_STREAM_CAPTURE);
290 if (ret)
291 return ret;
292 }
293
294 return 0;
295}
296
297static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
298{
299 struct snd_pcm_substream *substream;
300 struct snd_dma_buffer *buf;
301 int stream;
302
303 for (stream = 0; stream < 2; stream++) {
304 substream = pcm->streams[stream].substream;
305 if (!substream)
306 continue;
307 buf = &substream->dma_buffer;
308 if (!buf->area)
309 continue;
310
311 dma_free_coherent(pcm->card->dev, buf->bytes,
312 buf->area, buf->addr);
313 buf->area = NULL;
314 }
315}
316
317const struct snd_soc_component_driver kirkwood_soc_component = {
318 .name = DRV_NAME,
319 .ops = &kirkwood_dma_ops,
320 .pcm_new = kirkwood_dma_new,
321 .pcm_free = kirkwood_dma_free_dma_buffers,
322};
323
