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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
24static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs)
25{
26 struct snd_soc_pcm_runtime *soc_runtime = subs->private_data;
27 return snd_soc_dai_get_drvdata(soc_runtime->cpu_dai);
28}
29
30static const struct snd_pcm_hardware kirkwood_dma_snd_hw = {
31 .info = SNDRV_PCM_INFO_INTERLEAVED |
32 SNDRV_PCM_INFO_MMAP |
33 SNDRV_PCM_INFO_MMAP_VALID |
34 SNDRV_PCM_INFO_BLOCK_TRANSFER |
35 SNDRV_PCM_INFO_PAUSE |
36 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
37 .buffer_bytes_max = KIRKWOOD_SND_MAX_BUFFER_BYTES,
38 .period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES,
39 .period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES,
40 .periods_min = KIRKWOOD_SND_MIN_PERIODS,
41 .periods_max = KIRKWOOD_SND_MAX_PERIODS,
42 .fifo_size = 0,
43};
44
45static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
46{
47 struct kirkwood_dma_data *priv = dev_id;
48 unsigned long mask, status, cause;
49
50 mask = readl(priv->io + KIRKWOOD_INT_MASK);
51 status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
52
53 cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
54 if (unlikely(cause)) {
55 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
56 __func__, cause);
57 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
58 }
59
60
61 if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
62 KIRKWOOD_INT_CAUSE_REC_BYTES)) {
63 printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
64 __func__, status);
65 return IRQ_NONE;
66 }
67
68
69 writel(status, priv->io + KIRKWOOD_INT_CAUSE);
70
71 if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
72 snd_pcm_period_elapsed(priv->substream_play);
73
74 if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
75 snd_pcm_period_elapsed(priv->substream_rec);
76
77 return IRQ_HANDLED;
78}
79
80static void
81kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
82 unsigned long dma,
83 const struct mbus_dram_target_info *dram)
84{
85 int i;
86
87
88 writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
89 writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
90
91
92 for (i = 0; i < dram->num_cs; i++) {
93 const struct mbus_dram_window *cs = dram->cs + i;
94 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
95 writel(cs->base & 0xffff0000,
96 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
97 writel(((cs->size - 1) & 0xffff0000) |
98 (cs->mbus_attr << 8) |
99 (dram->mbus_dram_target_id << 4) | 1,
100 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
101 }
102 }
103}
104
105static int kirkwood_dma_open(struct snd_pcm_substream *substream)
106{
107 int err;
108 struct snd_pcm_runtime *runtime = substream->runtime;
109 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
110 const struct mbus_dram_target_info *dram;
111 unsigned long addr;
112
113 snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
114
115
116 err = snd_pcm_hw_constraint_minmax(runtime,
117 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
118 priv->burst * 2,
119 KIRKWOOD_AUDIO_BUF_MAX-1);
120 if (err < 0)
121 return err;
122
123 err = snd_pcm_hw_constraint_step(runtime, 0,
124 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
125 priv->burst);
126 if (err < 0)
127 return err;
128
129 err = snd_pcm_hw_constraint_step(substream->runtime, 0,
130 SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
131 priv->burst);
132 if (err < 0)
133 return err;
134
135 if (!priv->substream_play && !priv->substream_rec) {
136 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
137 "kirkwood-i2s", priv);
138 if (err)
139 return -EBUSY;
140
141
142
143
144
145 writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK);
146 }
147
148 dram = mv_mbus_dram_info();
149 addr = substream->dma_buffer.addr;
150 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
151 if (priv->substream_play)
152 return -EBUSY;
153 priv->substream_play = substream;
154 kirkwood_dma_conf_mbus_windows(priv->io,
155 KIRKWOOD_PLAYBACK_WIN, addr, dram);
156 } else {
157 if (priv->substream_rec)
158 return -EBUSY;
159 priv->substream_rec = substream;
160 kirkwood_dma_conf_mbus_windows(priv->io,
161 KIRKWOOD_RECORD_WIN, addr, dram);
162 }
163
164 return 0;
165}
166
167static int kirkwood_dma_close(struct snd_pcm_substream *substream)
168{
169 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
170
171 if (!priv)
172 return 0;
173
174 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
175 priv->substream_play = NULL;
176 else
177 priv->substream_rec = NULL;
178
179 if (!priv->substream_play && !priv->substream_rec) {
180 writel(0, priv->io + KIRKWOOD_ERR_MASK);
181 free_irq(priv->irq, priv);
182 }
183
184 return 0;
185}
186
187static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
188 struct snd_pcm_hw_params *params)
189{
190 struct snd_pcm_runtime *runtime = substream->runtime;
191
192 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
193 runtime->dma_bytes = params_buffer_bytes(params);
194
195 return 0;
196}
197
198static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
199{
200 snd_pcm_set_runtime_buffer(substream, NULL);
201 return 0;
202}
203
204static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
205{
206 struct snd_pcm_runtime *runtime = substream->runtime;
207 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
208 unsigned long size, count;
209
210
211 size = frames_to_bytes(runtime, runtime->buffer_size);
212 size = (size>>2)-1;
213 count = snd_pcm_lib_period_bytes(substream);
214
215 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
216 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
217 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
218 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
219 } else {
220 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
221 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
222 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
223 }
224
225
226 return 0;
227}
228
229static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
230 *substream)
231{
232 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
233 snd_pcm_uframes_t count;
234
235 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
236 count = bytes_to_frames(substream->runtime,
237 readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
238 else
239 count = bytes_to_frames(substream->runtime,
240 readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
241
242 return count;
243}
244
245static const struct snd_pcm_ops kirkwood_dma_ops = {
246 .open = kirkwood_dma_open,
247 .close = kirkwood_dma_close,
248 .ioctl = snd_pcm_lib_ioctl,
249 .hw_params = kirkwood_dma_hw_params,
250 .hw_free = kirkwood_dma_hw_free,
251 .prepare = kirkwood_dma_prepare,
252 .pointer = kirkwood_dma_pointer,
253};
254
255static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
256 int stream)
257{
258 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
259 struct snd_dma_buffer *buf = &substream->dma_buffer;
260 size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
261
262 buf->dev.type = SNDRV_DMA_TYPE_DEV;
263 buf->dev.dev = pcm->card->dev;
264 buf->area = dma_alloc_coherent(pcm->card->dev, size,
265 &buf->addr, GFP_KERNEL);
266 if (!buf->area)
267 return -ENOMEM;
268 buf->bytes = size;
269 buf->private_data = NULL;
270
271 return 0;
272}
273
274static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
275{
276 struct snd_card *card = rtd->card->snd_card;
277 struct snd_pcm *pcm = rtd->pcm;
278 int ret;
279
280 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
281 if (ret)
282 return ret;
283
284 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
285 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
286 SNDRV_PCM_STREAM_PLAYBACK);
287 if (ret)
288 return ret;
289 }
290
291 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
292 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
293 SNDRV_PCM_STREAM_CAPTURE);
294 if (ret)
295 return ret;
296 }
297
298 return 0;
299}
300
301static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
302{
303 struct snd_pcm_substream *substream;
304 struct snd_dma_buffer *buf;
305 int stream;
306
307 for (stream = 0; stream < 2; stream++) {
308 substream = pcm->streams[stream].substream;
309 if (!substream)
310 continue;
311 buf = &substream->dma_buffer;
312 if (!buf->area)
313 continue;
314
315 dma_free_coherent(pcm->card->dev, buf->bytes,
316 buf->area, buf->addr);
317 buf->area = NULL;
318 }
319}
320
321const struct snd_soc_component_driver kirkwood_soc_component = {
322 .name = DRV_NAME,
323 .ops = &kirkwood_dma_ops,
324 .pcm_new = kirkwood_dma_new,
325 .pcm_free = kirkwood_dma_free_dma_buffers,
326};
327
