Commit | Line | Data |
---|---|---|
f9b95980 | 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> | |
f9b95980 | 21 | #include "kirkwood.h" |
22 | ||
23 | #define KIRKWOOD_RATES \ | |
24 | (SNDRV_PCM_RATE_44100 | \ | |
25 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000) | |
26 | #define KIRKWOOD_FORMATS \ | |
27 | (SNDRV_PCM_FMTBIT_S16_LE | \ | |
28 | SNDRV_PCM_FMTBIT_S24_LE | \ | |
29 | SNDRV_PCM_FMTBIT_S32_LE) | |
30 | ||
31 | struct kirkwood_dma_priv { | |
32 | struct snd_pcm_substream *play_stream; | |
33 | struct snd_pcm_substream *rec_stream; | |
34 | struct kirkwood_dma_data *data; | |
35 | }; | |
36 | ||
37 | static struct snd_pcm_hardware kirkwood_dma_snd_hw = { | |
38 | .info = (SNDRV_PCM_INFO_INTERLEAVED | | |
39 | SNDRV_PCM_INFO_MMAP | | |
40 | SNDRV_PCM_INFO_MMAP_VALID | | |
41 | SNDRV_PCM_INFO_BLOCK_TRANSFER | | |
42 | SNDRV_PCM_INFO_PAUSE), | |
43 | .formats = KIRKWOOD_FORMATS, | |
44 | .rates = KIRKWOOD_RATES, | |
45 | .rate_min = 44100, | |
46 | .rate_max = 96000, | |
47 | .channels_min = 1, | |
48 | .channels_max = 2, | |
49 | .buffer_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES * KIRKWOOD_SND_MAX_PERIODS, | |
50 | .period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES, | |
51 | .period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES, | |
52 | .periods_min = KIRKWOOD_SND_MIN_PERIODS, | |
53 | .periods_max = KIRKWOOD_SND_MAX_PERIODS, | |
54 | .fifo_size = 0, | |
55 | }; | |
56 | ||
57 | static u64 kirkwood_dma_dmamask = 0xFFFFFFFFUL; | |
58 | ||
59 | static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id) | |
60 | { | |
61 | struct kirkwood_dma_priv *prdata = dev_id; | |
62 | struct kirkwood_dma_data *priv = prdata->data; | |
63 | unsigned long mask, status, cause; | |
64 | ||
65 | mask = readl(priv->io + KIRKWOOD_INT_MASK); | |
66 | status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask; | |
67 | ||
68 | cause = readl(priv->io + KIRKWOOD_ERR_CAUSE); | |
69 | if (unlikely(cause)) { | |
70 | printk(KERN_WARNING "%s: got err interrupt 0x%lx\n", | |
71 | __func__, cause); | |
72 | writel(cause, priv->io + KIRKWOOD_ERR_CAUSE); | |
73 | return IRQ_HANDLED; | |
74 | } | |
75 | ||
76 | /* we've enabled only bytes interrupts ... */ | |
77 | if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \ | |
78 | KIRKWOOD_INT_CAUSE_REC_BYTES)) { | |
79 | printk(KERN_WARNING "%s: unexpected interrupt %lx\n", | |
80 | __func__, status); | |
81 | return IRQ_NONE; | |
82 | } | |
83 | ||
84 | /* ack int */ | |
85 | writel(status, priv->io + KIRKWOOD_INT_CAUSE); | |
86 | ||
87 | if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES) | |
88 | snd_pcm_period_elapsed(prdata->play_stream); | |
89 | ||
90 | if (status & KIRKWOOD_INT_CAUSE_REC_BYTES) | |
91 | snd_pcm_period_elapsed(prdata->rec_stream); | |
92 | ||
93 | return IRQ_HANDLED; | |
94 | } | |
95 | ||
96 | static void kirkwood_dma_conf_mbus_windows(void __iomem *base, int win, | |
97 | unsigned long dma, | |
98 | struct mbus_dram_target_info *dram) | |
99 | { | |
100 | int i; | |
101 | ||
102 | /* First disable and clear windows */ | |
103 | writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win)); | |
104 | writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win)); | |
105 | ||
106 | /* try to find matching cs for current dma address */ | |
107 | for (i = 0; i < dram->num_cs; i++) { | |
108 | struct mbus_dram_window *cs = dram->cs + i; | |
109 | if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) { | |
110 | writel(cs->base & 0xffff0000, | |
111 | base + KIRKWOOD_AUDIO_WIN_BASE_REG(win)); | |
112 | writel(((cs->size - 1) & 0xffff0000) | | |
113 | (cs->mbus_attr << 8) | | |
114 | (dram->mbus_dram_target_id << 4) | 1, | |
115 | base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win)); | |
116 | } | |
117 | } | |
118 | } | |
119 | ||
120 | static int kirkwood_dma_open(struct snd_pcm_substream *substream) | |
121 | { | |
122 | int err; | |
123 | struct snd_pcm_runtime *runtime = substream->runtime; | |
124 | struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; | |
f0fba2ad LG |
125 | struct snd_soc_platform *platform = soc_runtime->platform; |
126 | struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai; | |
f9b95980 | 127 | struct kirkwood_dma_data *priv; |
f0fba2ad | 128 | struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform); |
f9b95980 | 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 | ||
f0fba2ad | 154 | if (prdata == NULL) { |
f9b95980 | 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 | ||
f0fba2ad | 168 | snd_soc_platform_set_drvdata(platform, prdata); |
f9b95980 | 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 | ||
191 | static int kirkwood_dma_close(struct snd_pcm_substream *substream) | |
192 | { | |
193 | struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; | |
f0fba2ad LG |
194 | struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai; |
195 | struct snd_soc_platform *platform = soc_runtime->platform; | |
196 | struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform); | |
f9b95980 | 197 | struct kirkwood_dma_data *priv; |
198 | ||
199 | priv = snd_soc_dai_get_dma_data(cpu_dai, substream); | |
200 | ||
201 | if (!prdata || !priv) | |
202 | return 0; | |
203 | ||
204 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
205 | prdata->play_stream = NULL; | |
206 | else | |
207 | prdata->rec_stream = NULL; | |
208 | ||
209 | if (!prdata->play_stream && !prdata->rec_stream) { | |
210 | writel(0, priv->io + KIRKWOOD_ERR_MASK); | |
211 | free_irq(priv->irq, prdata); | |
212 | kfree(prdata); | |
f0fba2ad | 213 | snd_soc_platform_set_drvdata(platform, NULL); |
f9b95980 | 214 | } |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
219 | static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream, | |
220 | struct snd_pcm_hw_params *params) | |
221 | { | |
222 | struct snd_pcm_runtime *runtime = substream->runtime; | |
223 | ||
224 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); | |
225 | runtime->dma_bytes = params_buffer_bytes(params); | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
230 | static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream) | |
231 | { | |
232 | snd_pcm_set_runtime_buffer(substream, NULL); | |
233 | return 0; | |
234 | } | |
235 | ||
236 | static int kirkwood_dma_prepare(struct snd_pcm_substream *substream) | |
237 | { | |
238 | struct snd_pcm_runtime *runtime = substream->runtime; | |
239 | struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; | |
f0fba2ad | 240 | struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai; |
f9b95980 | 241 | struct kirkwood_dma_data *priv; |
242 | unsigned long size, count; | |
243 | ||
244 | priv = snd_soc_dai_get_dma_data(cpu_dai, substream); | |
245 | ||
246 | /* compute buffer size in term of "words" as requested in specs */ | |
247 | size = frames_to_bytes(runtime, runtime->buffer_size); | |
248 | size = (size>>2)-1; | |
249 | count = snd_pcm_lib_period_bytes(substream); | |
250 | ||
251 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
252 | writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT); | |
253 | writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR); | |
254 | writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE); | |
255 | } else { | |
256 | writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT); | |
257 | writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR); | |
258 | writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE); | |
259 | } | |
260 | ||
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
265 | static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream | |
266 | *substream) | |
267 | { | |
268 | struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; | |
f0fba2ad | 269 | struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai; |
f9b95980 | 270 | struct kirkwood_dma_data *priv; |
271 | snd_pcm_uframes_t count; | |
272 | ||
273 | priv = snd_soc_dai_get_dma_data(cpu_dai, substream); | |
274 | ||
275 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
276 | count = bytes_to_frames(substream->runtime, | |
277 | readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT)); | |
278 | else | |
279 | count = bytes_to_frames(substream->runtime, | |
280 | readl(priv->io + KIRKWOOD_REC_BYTE_COUNT)); | |
281 | ||
282 | return count; | |
283 | } | |
284 | ||
285 | struct snd_pcm_ops kirkwood_dma_ops = { | |
286 | .open = kirkwood_dma_open, | |
287 | .close = kirkwood_dma_close, | |
288 | .ioctl = snd_pcm_lib_ioctl, | |
289 | .hw_params = kirkwood_dma_hw_params, | |
290 | .hw_free = kirkwood_dma_hw_free, | |
291 | .prepare = kirkwood_dma_prepare, | |
292 | .pointer = kirkwood_dma_pointer, | |
293 | }; | |
294 | ||
295 | static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm, | |
296 | int stream) | |
297 | { | |
298 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
299 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
300 | size_t size = kirkwood_dma_snd_hw.buffer_bytes_max; | |
301 | ||
302 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
303 | buf->dev.dev = pcm->card->dev; | |
304 | buf->area = dma_alloc_coherent(pcm->card->dev, size, | |
305 | &buf->addr, GFP_KERNEL); | |
306 | if (!buf->area) | |
307 | return -ENOMEM; | |
308 | buf->bytes = size; | |
309 | buf->private_data = NULL; | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
314 | static int kirkwood_dma_new(struct snd_card *card, | |
315 | struct snd_soc_dai *dai, struct snd_pcm *pcm) | |
316 | { | |
317 | int ret; | |
318 | ||
319 | if (!card->dev->dma_mask) | |
320 | card->dev->dma_mask = &kirkwood_dma_dmamask; | |
321 | if (!card->dev->coherent_dma_mask) | |
322 | card->dev->coherent_dma_mask = 0xffffffff; | |
323 | ||
f0fba2ad | 324 | if (dai->driver->playback.channels_min) { |
f9b95980 | 325 | ret = kirkwood_dma_preallocate_dma_buffer(pcm, |
326 | SNDRV_PCM_STREAM_PLAYBACK); | |
327 | if (ret) | |
328 | return ret; | |
329 | } | |
330 | ||
f0fba2ad | 331 | if (dai->driver->capture.channels_min) { |
f9b95980 | 332 | ret = kirkwood_dma_preallocate_dma_buffer(pcm, |
333 | SNDRV_PCM_STREAM_CAPTURE); | |
334 | if (ret) | |
335 | return ret; | |
336 | } | |
337 | ||
338 | return 0; | |
339 | } | |
340 | ||
341 | static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm) | |
342 | { | |
343 | struct snd_pcm_substream *substream; | |
344 | struct snd_dma_buffer *buf; | |
345 | int stream; | |
346 | ||
347 | for (stream = 0; stream < 2; stream++) { | |
348 | substream = pcm->streams[stream].substream; | |
349 | if (!substream) | |
350 | continue; | |
351 | buf = &substream->dma_buffer; | |
352 | if (!buf->area) | |
353 | continue; | |
354 | ||
355 | dma_free_coherent(pcm->card->dev, buf->bytes, | |
356 | buf->area, buf->addr); | |
357 | buf->area = NULL; | |
358 | } | |
359 | } | |
360 | ||
f0fba2ad LG |
361 | static struct snd_soc_platform_driver kirkwood_soc_platform = { |
362 | .ops = &kirkwood_dma_ops, | |
f9b95980 | 363 | .pcm_new = kirkwood_dma_new, |
364 | .pcm_free = kirkwood_dma_free_dma_buffers, | |
365 | }; | |
f9b95980 | 366 | |
f0fba2ad | 367 | static int __devinit kirkwood_soc_platform_probe(struct platform_device *pdev) |
f9b95980 | 368 | { |
f0fba2ad | 369 | return snd_soc_register_platform(&pdev->dev, &kirkwood_soc_platform); |
f9b95980 | 370 | } |
f9b95980 | 371 | |
f0fba2ad | 372 | static int __devexit kirkwood_soc_platform_remove(struct platform_device *pdev) |
f9b95980 | 373 | { |
f0fba2ad LG |
374 | snd_soc_unregister_platform(&pdev->dev); |
375 | return 0; | |
376 | } | |
377 | ||
378 | static struct platform_driver kirkwood_pcm_driver = { | |
379 | .driver = { | |
380 | .name = "kirkwood-pcm-audio", | |
381 | .owner = THIS_MODULE, | |
382 | }, | |
383 | ||
384 | .probe = kirkwood_soc_platform_probe, | |
385 | .remove = __devexit_p(kirkwood_soc_platform_remove), | |
386 | }; | |
387 | ||
388 | static int __init kirkwood_pcm_init(void) | |
389 | { | |
390 | return platform_driver_register(&kirkwood_pcm_driver); | |
391 | } | |
392 | module_init(kirkwood_pcm_init); | |
393 | ||
394 | static void __exit kirkwood_pcm_exit(void) | |
395 | { | |
396 | platform_driver_unregister(&kirkwood_pcm_driver); | |
f9b95980 | 397 | } |
f0fba2ad | 398 | module_exit(kirkwood_pcm_exit); |
f9b95980 | 399 | |
400 | MODULE_AUTHOR("Arnaud Patard <apatard@mandriva.com>"); | |
401 | MODULE_DESCRIPTION("Marvell Kirkwood Audio DMA module"); | |
402 | MODULE_LICENSE("GPL"); | |
403 |