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-rw-r--r--sound/soc/davinci/davinci-i2s.c407
1 files changed, 407 insertions, 0 deletions
diff --git a/sound/soc/davinci/davinci-i2s.c b/sound/soc/davinci/davinci-i2s.c
new file mode 100644
index 000000000000..c421774b33ee
--- /dev/null
+++ b/sound/soc/davinci/davinci-i2s.c
@@ -0,0 +1,407 @@
1/*
2 * ALSA SoC I2S (McBSP) Audio Layer for TI DAVINCI processor
3 *
4 * Author: Vladimir Barinov, <vbarinov@ru.mvista.com>
5 * Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/device.h>
15#include <linux/delay.h>
16#include <linux/io.h>
17#include <linux/clk.h>
18
19#include <sound/core.h>
20#include <sound/pcm.h>
21#include <sound/pcm_params.h>
22#include <sound/initval.h>
23#include <sound/soc.h>
24
25#include "davinci-pcm.h"
26
27#define DAVINCI_MCBSP_DRR_REG 0x00
28#define DAVINCI_MCBSP_DXR_REG 0x04
29#define DAVINCI_MCBSP_SPCR_REG 0x08
30#define DAVINCI_MCBSP_RCR_REG 0x0c
31#define DAVINCI_MCBSP_XCR_REG 0x10
32#define DAVINCI_MCBSP_SRGR_REG 0x14
33#define DAVINCI_MCBSP_PCR_REG 0x24
34
35#define DAVINCI_MCBSP_SPCR_RRST (1 << 0)
36#define DAVINCI_MCBSP_SPCR_RINTM(v) ((v) << 4)
37#define DAVINCI_MCBSP_SPCR_XRST (1 << 16)
38#define DAVINCI_MCBSP_SPCR_XINTM(v) ((v) << 20)
39#define DAVINCI_MCBSP_SPCR_GRST (1 << 22)
40#define DAVINCI_MCBSP_SPCR_FRST (1 << 23)
41#define DAVINCI_MCBSP_SPCR_FREE (1 << 25)
42
43#define DAVINCI_MCBSP_RCR_RWDLEN1(v) ((v) << 5)
44#define DAVINCI_MCBSP_RCR_RFRLEN1(v) ((v) << 8)
45#define DAVINCI_MCBSP_RCR_RDATDLY(v) ((v) << 16)
46#define DAVINCI_MCBSP_RCR_RWDLEN2(v) ((v) << 21)
47
48#define DAVINCI_MCBSP_XCR_XWDLEN1(v) ((v) << 5)
49#define DAVINCI_MCBSP_XCR_XFRLEN1(v) ((v) << 8)
50#define DAVINCI_MCBSP_XCR_XDATDLY(v) ((v) << 16)
51#define DAVINCI_MCBSP_XCR_XFIG (1 << 18)
52#define DAVINCI_MCBSP_XCR_XWDLEN2(v) ((v) << 21)
53
54#define DAVINCI_MCBSP_SRGR_FWID(v) ((v) << 8)
55#define DAVINCI_MCBSP_SRGR_FPER(v) ((v) << 16)
56#define DAVINCI_MCBSP_SRGR_FSGM (1 << 28)
57
58#define DAVINCI_MCBSP_PCR_CLKRP (1 << 0)
59#define DAVINCI_MCBSP_PCR_CLKXP (1 << 1)
60#define DAVINCI_MCBSP_PCR_FSRP (1 << 2)
61#define DAVINCI_MCBSP_PCR_FSXP (1 << 3)
62#define DAVINCI_MCBSP_PCR_CLKRM (1 << 8)
63#define DAVINCI_MCBSP_PCR_CLKXM (1 << 9)
64#define DAVINCI_MCBSP_PCR_FSRM (1 << 10)
65#define DAVINCI_MCBSP_PCR_FSXM (1 << 11)
66
67#define MOD_REG_BIT(val, mask, set) do { \
68 if (set) { \
69 val |= mask; \
70 } else { \
71 val &= ~mask; \
72 } \
73} while (0)
74
75enum {
76 DAVINCI_MCBSP_WORD_8 = 0,
77 DAVINCI_MCBSP_WORD_12,
78 DAVINCI_MCBSP_WORD_16,
79 DAVINCI_MCBSP_WORD_20,
80 DAVINCI_MCBSP_WORD_24,
81 DAVINCI_MCBSP_WORD_32,
82};
83
84static struct davinci_pcm_dma_params davinci_i2s_pcm_out = {
85 .name = "I2S PCM Stereo out",
86};
87
88static struct davinci_pcm_dma_params davinci_i2s_pcm_in = {
89 .name = "I2S PCM Stereo in",
90};
91
92struct davinci_mcbsp_dev {
93 void __iomem *base;
94 struct clk *clk;
95 struct davinci_pcm_dma_params *dma_params[2];
96};
97
98static inline void davinci_mcbsp_write_reg(struct davinci_mcbsp_dev *dev,
99 int reg, u32 val)
100{
101 __raw_writel(val, dev->base + reg);
102}
103
104static inline u32 davinci_mcbsp_read_reg(struct davinci_mcbsp_dev *dev, int reg)
105{
106 return __raw_readl(dev->base + reg);
107}
108
109static void davinci_mcbsp_start(struct snd_pcm_substream *substream)
110{
111 struct snd_soc_pcm_runtime *rtd = substream->private_data;
112 struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
113 u32 w;
114
115 /* Start the sample generator and enable transmitter/receiver */
116 w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
117 MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_GRST, 1);
118 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
119 MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_XRST, 1);
120 else
121 MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_RRST, 1);
122 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
123
124 /* Start frame sync */
125 w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
126 MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_FRST, 1);
127 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
128}
129
130static void davinci_mcbsp_stop(struct snd_pcm_substream *substream)
131{
132 struct snd_soc_pcm_runtime *rtd = substream->private_data;
133 struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
134 u32 w;
135
136 /* Reset transmitter/receiver and sample rate/frame sync generators */
137 w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
138 MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_GRST |
139 DAVINCI_MCBSP_SPCR_FRST, 0);
140 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
141 MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_XRST, 0);
142 else
143 MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_RRST, 0);
144 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
145}
146
147static int davinci_i2s_startup(struct snd_pcm_substream *substream)
148{
149 struct snd_soc_pcm_runtime *rtd = substream->private_data;
150 struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
151 struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
152
153 cpu_dai->dma_data = dev->dma_params[substream->stream];
154
155 return 0;
156}
157
158static int davinci_i2s_set_dai_fmt(struct snd_soc_cpu_dai *cpu_dai,
159 unsigned int fmt)
160{
161 struct davinci_mcbsp_dev *dev = cpu_dai->private_data;
162 u32 w;
163
164 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
165 case SND_SOC_DAIFMT_CBS_CFS:
166 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG,
167 DAVINCI_MCBSP_PCR_FSXM |
168 DAVINCI_MCBSP_PCR_FSRM |
169 DAVINCI_MCBSP_PCR_CLKXM |
170 DAVINCI_MCBSP_PCR_CLKRM);
171 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG,
172 DAVINCI_MCBSP_SRGR_FSGM);
173 break;
174 case SND_SOC_DAIFMT_CBM_CFM:
175 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, 0);
176 break;
177 default:
178 return -EINVAL;
179 }
180
181 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
182 case SND_SOC_DAIFMT_IB_NF:
183 w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_PCR_REG);
184 MOD_REG_BIT(w, DAVINCI_MCBSP_PCR_CLKXP |
185 DAVINCI_MCBSP_PCR_CLKRP, 1);
186 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, w);
187 break;
188 case SND_SOC_DAIFMT_NB_IF:
189 w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_PCR_REG);
190 MOD_REG_BIT(w, DAVINCI_MCBSP_PCR_FSXP |
191 DAVINCI_MCBSP_PCR_FSRP, 1);
192 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, w);
193 break;
194 case SND_SOC_DAIFMT_IB_IF:
195 w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_PCR_REG);
196 MOD_REG_BIT(w, DAVINCI_MCBSP_PCR_CLKXP |
197 DAVINCI_MCBSP_PCR_CLKRP |
198 DAVINCI_MCBSP_PCR_FSXP |
199 DAVINCI_MCBSP_PCR_FSRP, 1);
200 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, w);
201 break;
202 case SND_SOC_DAIFMT_NB_NF:
203 break;
204 default:
205 return -EINVAL;
206 }
207
208 return 0;
209}
210
211static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
212 struct snd_pcm_hw_params *params)
213{
214 struct snd_soc_pcm_runtime *rtd = substream->private_data;
215 struct davinci_pcm_dma_params *dma_params = rtd->dai->cpu_dai->dma_data;
216 struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
217 struct snd_interval *i = NULL;
218 int mcbsp_word_length;
219 u32 w;
220
221 /* general line settings */
222 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG,
223 DAVINCI_MCBSP_SPCR_RINTM(3) |
224 DAVINCI_MCBSP_SPCR_XINTM(3) |
225 DAVINCI_MCBSP_SPCR_FREE);
226 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_RCR_REG,
227 DAVINCI_MCBSP_RCR_RFRLEN1(1) |
228 DAVINCI_MCBSP_RCR_RDATDLY(1));
229 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_XCR_REG,
230 DAVINCI_MCBSP_XCR_XFRLEN1(1) |
231 DAVINCI_MCBSP_XCR_XDATDLY(1) |
232 DAVINCI_MCBSP_XCR_XFIG);
233
234 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
235 w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SRGR_REG);
236 MOD_REG_BIT(w, DAVINCI_MCBSP_SRGR_FWID(snd_interval_value(i) - 1), 1);
237 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, w);
238
239 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_FRAME_BITS);
240 w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SRGR_REG);
241 MOD_REG_BIT(w, DAVINCI_MCBSP_SRGR_FPER(snd_interval_value(i) - 1), 1);
242 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, w);
243
244 /* Determine xfer data type */
245 switch (params_format(params)) {
246 case SNDRV_PCM_FORMAT_S8:
247 dma_params->data_type = 1;
248 mcbsp_word_length = DAVINCI_MCBSP_WORD_8;
249 break;
250 case SNDRV_PCM_FORMAT_S16_LE:
251 dma_params->data_type = 2;
252 mcbsp_word_length = DAVINCI_MCBSP_WORD_16;
253 break;
254 case SNDRV_PCM_FORMAT_S32_LE:
255 dma_params->data_type = 4;
256 mcbsp_word_length = DAVINCI_MCBSP_WORD_32;
257 break;
258 default:
259 printk(KERN_WARNING "davinci-i2s: unsupported PCM format");
260 return -EINVAL;
261 }
262
263 w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_RCR_REG);
264 MOD_REG_BIT(w, DAVINCI_MCBSP_RCR_RWDLEN1(mcbsp_word_length) |
265 DAVINCI_MCBSP_RCR_RWDLEN2(mcbsp_word_length), 1);
266 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_RCR_REG, w);
267
268 w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_XCR_REG);
269 MOD_REG_BIT(w, DAVINCI_MCBSP_XCR_XWDLEN1(mcbsp_word_length) |
270 DAVINCI_MCBSP_XCR_XWDLEN2(mcbsp_word_length), 1);
271 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_XCR_REG, w);
272
273 return 0;
274}
275
276static int davinci_i2s_trigger(struct snd_pcm_substream *substream, int cmd)
277{
278 int ret = 0;
279
280 switch (cmd) {
281 case SNDRV_PCM_TRIGGER_START:
282 case SNDRV_PCM_TRIGGER_RESUME:
283 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
284 davinci_mcbsp_start(substream);
285 break;
286 case SNDRV_PCM_TRIGGER_STOP:
287 case SNDRV_PCM_TRIGGER_SUSPEND:
288 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
289 davinci_mcbsp_stop(substream);
290 break;
291 default:
292 ret = -EINVAL;
293 }
294
295 return ret;
296}
297
298static int davinci_i2s_probe(struct platform_device *pdev)
299{
300 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
301 struct snd_soc_machine *machine = socdev->machine;
302 struct snd_soc_cpu_dai *cpu_dai = machine->dai_link[pdev->id].cpu_dai;
303 struct davinci_mcbsp_dev *dev;
304 struct resource *mem, *ioarea;
305 struct evm_snd_platform_data *pdata;
306 int ret;
307
308 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
309 if (!mem) {
310 dev_err(&pdev->dev, "no mem resource?\n");
311 return -ENODEV;
312 }
313
314 ioarea = request_mem_region(mem->start, (mem->end - mem->start) + 1,
315 pdev->name);
316 if (!ioarea) {
317 dev_err(&pdev->dev, "McBSP region already claimed\n");
318 return -EBUSY;
319 }
320
321 dev = kzalloc(sizeof(struct davinci_mcbsp_dev), GFP_KERNEL);
322 if (!dev) {
323 ret = -ENOMEM;
324 goto err_release_region;
325 }
326
327 cpu_dai->private_data = dev;
328
329 dev->clk = clk_get(&pdev->dev, "McBSPCLK");
330 if (IS_ERR(dev->clk)) {
331 ret = -ENODEV;
332 goto err_free_mem;
333 }
334 clk_enable(dev->clk);
335
336 dev->base = (void __iomem *)IO_ADDRESS(mem->start);
337 pdata = pdev->dev.platform_data;
338
339 dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK] = &davinci_i2s_pcm_out;
340 dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK]->channel = pdata->tx_dma_ch;
341 dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK]->dma_addr =
342 (dma_addr_t)(io_v2p(dev->base) + DAVINCI_MCBSP_DXR_REG);
343
344 dev->dma_params[SNDRV_PCM_STREAM_CAPTURE] = &davinci_i2s_pcm_in;
345 dev->dma_params[SNDRV_PCM_STREAM_CAPTURE]->channel = pdata->rx_dma_ch;
346 dev->dma_params[SNDRV_PCM_STREAM_CAPTURE]->dma_addr =
347 (dma_addr_t)(io_v2p(dev->base) + DAVINCI_MCBSP_DRR_REG);
348
349 return 0;
350
351err_free_mem:
352 kfree(dev);
353err_release_region:
354 release_mem_region(mem->start, (mem->end - mem->start) + 1);
355
356 return ret;
357}
358
359static void davinci_i2s_remove(struct platform_device *pdev)
360{
361 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
362 struct snd_soc_machine *machine = socdev->machine;
363 struct snd_soc_cpu_dai *cpu_dai = machine->dai_link[pdev->id].cpu_dai;
364 struct davinci_mcbsp_dev *dev = cpu_dai->private_data;
365 struct resource *mem;
366
367 clk_disable(dev->clk);
368 clk_put(dev->clk);
369 dev->clk = NULL;
370
371 kfree(dev);
372
373 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
374 release_mem_region(mem->start, (mem->end - mem->start) + 1);
375}
376
377#define DAVINCI_I2S_RATES SNDRV_PCM_RATE_8000_96000
378
379struct snd_soc_cpu_dai davinci_i2s_dai = {
380 .name = "davinci-i2s",
381 .id = 0,
382 .type = SND_SOC_DAI_I2S,
383 .probe = davinci_i2s_probe,
384 .remove = davinci_i2s_remove,
385 .playback = {
386 .channels_min = 2,
387 .channels_max = 2,
388 .rates = DAVINCI_I2S_RATES,
389 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
390 .capture = {
391 .channels_min = 2,
392 .channels_max = 2,
393 .rates = DAVINCI_I2S_RATES,
394 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
395 .ops = {
396 .startup = davinci_i2s_startup,
397 .trigger = davinci_i2s_trigger,
398 .hw_params = davinci_i2s_hw_params,},
399 .dai_ops = {
400 .set_fmt = davinci_i2s_set_dai_fmt,
401 },
402};
403EXPORT_SYMBOL_GPL(davinci_i2s_dai);
404
405MODULE_AUTHOR("Vladimir Barinov");
406MODULE_DESCRIPTION("TI DAVINCI I2S (McBSP) SoC Interface");
407MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-03 14:50:44 -0500