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3e7cc3d3 LG |
1 | /* |
2 | * pxa2xx-i2s.c -- ALSA Soc Audio Layer | |
3 | * | |
4 | * Copyright 2005 Wolfson Microelectronics PLC. | |
5 | * Author: Liam Girdwood | |
d331124d | 6 | * lrg@slimlogic.co.uk |
3e7cc3d3 LG |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
3e7cc3d3 LG |
12 | */ |
13 | ||
14 | #include <linux/init.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/delay.h> | |
5a2cc50f | 18 | #include <linux/clk.h> |
6e5ea701 | 19 | #include <linux/platform_device.h> |
3e7cc3d3 LG |
20 | #include <sound/core.h> |
21 | #include <sound/pcm.h> | |
22 | #include <sound/initval.h> | |
23 | #include <sound/soc.h> | |
a6d77317 | 24 | #include <sound/pxa2xx-lib.h> |
3e7cc3d3 | 25 | |
a09e64fb | 26 | #include <mach/hardware.h> |
7ebc8d56 | 27 | #include <mach/dma.h> |
a09e64fb | 28 | #include <mach/audio.h> |
3e7cc3d3 LG |
29 | |
30 | #include "pxa2xx-pcm.h" | |
eaff2ae7 | 31 | #include "pxa2xx-i2s.h" |
3e7cc3d3 | 32 | |
52358ba3 EM |
33 | /* |
34 | * I2S Controller Register and Bit Definitions | |
35 | */ | |
36 | #define SACR0 __REG(0x40400000) /* Global Control Register */ | |
37 | #define SACR1 __REG(0x40400004) /* Serial Audio I 2 S/MSB-Justified Control Register */ | |
38 | #define SASR0 __REG(0x4040000C) /* Serial Audio I 2 S/MSB-Justified Interface and FIFO Status Register */ | |
39 | #define SAIMR __REG(0x40400014) /* Serial Audio Interrupt Mask Register */ | |
40 | #define SAICR __REG(0x40400018) /* Serial Audio Interrupt Clear Register */ | |
41 | #define SADIV __REG(0x40400060) /* Audio Clock Divider Register. */ | |
42 | #define SADR __REG(0x40400080) /* Serial Audio Data Register (TX and RX FIFO access Register). */ | |
43 | ||
44 | #define SACR0_RFTH(x) ((x) << 12) /* Rx FIFO Interrupt or DMA Trigger Threshold */ | |
45 | #define SACR0_TFTH(x) ((x) << 8) /* Tx FIFO Interrupt or DMA Trigger Threshold */ | |
46 | #define SACR0_STRF (1 << 5) /* FIFO Select for EFWR Special Function */ | |
47 | #define SACR0_EFWR (1 << 4) /* Enable EFWR Function */ | |
48 | #define SACR0_RST (1 << 3) /* FIFO, i2s Register Reset */ | |
49 | #define SACR0_BCKD (1 << 2) /* Bit Clock Direction */ | |
50 | #define SACR0_ENB (1 << 0) /* Enable I2S Link */ | |
51 | #define SACR1_ENLBF (1 << 5) /* Enable Loopback */ | |
52 | #define SACR1_DRPL (1 << 4) /* Disable Replaying Function */ | |
53 | #define SACR1_DREC (1 << 3) /* Disable Recording Function */ | |
54 | #define SACR1_AMSL (1 << 0) /* Specify Alternate Mode */ | |
55 | ||
56 | #define SASR0_I2SOFF (1 << 7) /* Controller Status */ | |
57 | #define SASR0_ROR (1 << 6) /* Rx FIFO Overrun */ | |
58 | #define SASR0_TUR (1 << 5) /* Tx FIFO Underrun */ | |
59 | #define SASR0_RFS (1 << 4) /* Rx FIFO Service Request */ | |
60 | #define SASR0_TFS (1 << 3) /* Tx FIFO Service Request */ | |
61 | #define SASR0_BSY (1 << 2) /* I2S Busy */ | |
62 | #define SASR0_RNE (1 << 1) /* Rx FIFO Not Empty */ | |
63 | #define SASR0_TNF (1 << 0) /* Tx FIFO Not Empty */ | |
64 | ||
65 | #define SAICR_ROR (1 << 6) /* Clear Rx FIFO Overrun Interrupt */ | |
66 | #define SAICR_TUR (1 << 5) /* Clear Tx FIFO Underrun Interrupt */ | |
67 | ||
68 | #define SAIMR_ROR (1 << 6) /* Enable Rx FIFO Overrun Condition Interrupt */ | |
69 | #define SAIMR_TUR (1 << 5) /* Enable Tx FIFO Underrun Condition Interrupt */ | |
70 | #define SAIMR_RFS (1 << 4) /* Enable Rx FIFO Service Interrupt */ | |
71 | #define SAIMR_TFS (1 << 3) /* Enable Tx FIFO Service Interrupt */ | |
a6d77317 | 72 | |
3e7cc3d3 LG |
73 | struct pxa_i2s_port { |
74 | u32 sadiv; | |
75 | u32 sacr0; | |
76 | u32 sacr1; | |
77 | u32 saimr; | |
78 | int master; | |
eaff2ae7 | 79 | u32 fmt; |
3e7cc3d3 LG |
80 | }; |
81 | static struct pxa_i2s_port pxa_i2s; | |
5a2cc50f | 82 | static struct clk *clk_i2s; |
f0fba2ad | 83 | static int clk_ena = 0; |
3e7cc3d3 | 84 | |
3e7cc3d3 LG |
85 | static struct pxa2xx_pcm_dma_params pxa2xx_i2s_pcm_stereo_out = { |
86 | .name = "I2S PCM Stereo out", | |
87 | .dev_addr = __PREG(SADR), | |
87f3dd77 | 88 | .drcmr = &DRCMR(3), |
3e7cc3d3 LG |
89 | .dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG | |
90 | DCMD_BURST32 | DCMD_WIDTH4, | |
91 | }; | |
92 | ||
93 | static struct pxa2xx_pcm_dma_params pxa2xx_i2s_pcm_stereo_in = { | |
94 | .name = "I2S PCM Stereo in", | |
95 | .dev_addr = __PREG(SADR), | |
87f3dd77 | 96 | .drcmr = &DRCMR(2), |
3e7cc3d3 LG |
97 | .dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC | |
98 | DCMD_BURST32 | DCMD_WIDTH4, | |
99 | }; | |
100 | ||
dee89c4d MB |
101 | static int pxa2xx_i2s_startup(struct snd_pcm_substream *substream, |
102 | struct snd_soc_dai *dai) | |
3e7cc3d3 LG |
103 | { |
104 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
f0fba2ad | 105 | struct snd_soc_dai *cpu_dai = rtd->cpu_dai; |
3e7cc3d3 | 106 | |
5a2cc50f | 107 | if (IS_ERR(clk_i2s)) |
108 | return PTR_ERR(clk_i2s); | |
109 | ||
b243b77c | 110 | if (!cpu_dai->active) |
3e7cc3d3 | 111 | SACR0 = 0; |
3e7cc3d3 LG |
112 | |
113 | return 0; | |
114 | } | |
115 | ||
116 | /* wait for I2S controller to be ready */ | |
117 | static int pxa_i2s_wait(void) | |
118 | { | |
119 | int i; | |
120 | ||
121 | /* flush the Rx FIFO */ | |
122 | for(i = 0; i < 16; i++) | |
123 | SADR; | |
124 | return 0; | |
125 | } | |
126 | ||
917f93ac | 127 | static int pxa2xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai, |
eaff2ae7 | 128 | unsigned int fmt) |
3e7cc3d3 | 129 | { |
eaff2ae7 PZ |
130 | /* interface format */ |
131 | switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { | |
132 | case SND_SOC_DAIFMT_I2S: | |
133 | pxa_i2s.fmt = 0; | |
134 | break; | |
135 | case SND_SOC_DAIFMT_LEFT_J: | |
136 | pxa_i2s.fmt = SACR1_AMSL; | |
137 | break; | |
138 | } | |
3e7cc3d3 | 139 | |
eaff2ae7 PZ |
140 | switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { |
141 | case SND_SOC_DAIFMT_CBS_CFS: | |
3e7cc3d3 | 142 | pxa_i2s.master = 1; |
eaff2ae7 PZ |
143 | break; |
144 | case SND_SOC_DAIFMT_CBM_CFS: | |
145 | pxa_i2s.master = 0; | |
146 | break; | |
147 | default: | |
148 | break; | |
149 | } | |
150 | return 0; | |
151 | } | |
3e7cc3d3 | 152 | |
917f93ac | 153 | static int pxa2xx_i2s_set_dai_sysclk(struct snd_soc_dai *cpu_dai, |
eaff2ae7 PZ |
154 | int clk_id, unsigned int freq, int dir) |
155 | { | |
156 | if (clk_id != PXA2XX_I2S_SYSCLK) | |
157 | return -ENODEV; | |
158 | ||
eaff2ae7 PZ |
159 | return 0; |
160 | } | |
161 | ||
162 | static int pxa2xx_i2s_hw_params(struct snd_pcm_substream *substream, | |
dee89c4d MB |
163 | struct snd_pcm_hw_params *params, |
164 | struct snd_soc_dai *dai) | |
eaff2ae7 | 165 | { |
5f712b2b | 166 | struct pxa2xx_pcm_dma_params *dma_data; |
eaff2ae7 | 167 | |
6e5ea701 | 168 | BUG_ON(IS_ERR(clk_i2s)); |
5a2cc50f | 169 | clk_enable(clk_i2s); |
f0fba2ad | 170 | clk_ena = 1; |
3e7cc3d3 LG |
171 | pxa_i2s_wait(); |
172 | ||
173 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
5f712b2b | 174 | dma_data = &pxa2xx_i2s_pcm_stereo_out; |
3e7cc3d3 | 175 | else |
5f712b2b DM |
176 | dma_data = &pxa2xx_i2s_pcm_stereo_in; |
177 | ||
f0fba2ad | 178 | snd_soc_dai_set_dma_data(dai, substream, dma_data); |
3e7cc3d3 LG |
179 | |
180 | /* is port used by another stream */ | |
181 | if (!(SACR0 & SACR0_ENB)) { | |
3e7cc3d3 | 182 | SACR0 = 0; |
3e7cc3d3 LG |
183 | if (pxa_i2s.master) |
184 | SACR0 |= SACR0_BCKD; | |
185 | ||
186 | SACR0 |= SACR0_RFTH(14) | SACR0_TFTH(1); | |
eaff2ae7 | 187 | SACR1 |= pxa_i2s.fmt; |
3e7cc3d3 LG |
188 | } |
189 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
190 | SAIMR |= SAIMR_TFS; | |
191 | else | |
192 | SAIMR |= SAIMR_RFS; | |
193 | ||
eaff2ae7 PZ |
194 | switch (params_rate(params)) { |
195 | case 8000: | |
196 | SADIV = 0x48; | |
197 | break; | |
198 | case 11025: | |
199 | SADIV = 0x34; | |
200 | break; | |
201 | case 16000: | |
202 | SADIV = 0x24; | |
203 | break; | |
204 | case 22050: | |
205 | SADIV = 0x1a; | |
206 | break; | |
207 | case 44100: | |
208 | SADIV = 0xd; | |
209 | break; | |
210 | case 48000: | |
211 | SADIV = 0xc; | |
212 | break; | |
213 | case 96000: /* not in manual and possibly slightly inaccurate */ | |
214 | SADIV = 0x6; | |
215 | break; | |
216 | } | |
217 | ||
3e7cc3d3 LG |
218 | return 0; |
219 | } | |
220 | ||
dee89c4d MB |
221 | static int pxa2xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd, |
222 | struct snd_soc_dai *dai) | |
3e7cc3d3 LG |
223 | { |
224 | int ret = 0; | |
225 | ||
226 | switch (cmd) { | |
227 | case SNDRV_PCM_TRIGGER_START: | |
34555c10 KB |
228 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
229 | SACR1 &= ~SACR1_DRPL; | |
230 | else | |
231 | SACR1 &= ~SACR1_DREC; | |
3e7cc3d3 LG |
232 | SACR0 |= SACR0_ENB; |
233 | break; | |
234 | case SNDRV_PCM_TRIGGER_RESUME: | |
235 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
236 | case SNDRV_PCM_TRIGGER_STOP: | |
237 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
238 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
239 | break; | |
240 | default: | |
241 | ret = -EINVAL; | |
242 | } | |
243 | ||
244 | return ret; | |
245 | } | |
246 | ||
dee89c4d MB |
247 | static void pxa2xx_i2s_shutdown(struct snd_pcm_substream *substream, |
248 | struct snd_soc_dai *dai) | |
3e7cc3d3 LG |
249 | { |
250 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
251 | SACR1 |= SACR1_DRPL; | |
252 | SAIMR &= ~SAIMR_TFS; | |
253 | } else { | |
254 | SACR1 |= SACR1_DREC; | |
255 | SAIMR &= ~SAIMR_RFS; | |
256 | } | |
257 | ||
34555c10 | 258 | if ((SACR1 & (SACR1_DREC | SACR1_DRPL)) == (SACR1_DREC | SACR1_DRPL)) { |
3e7cc3d3 LG |
259 | SACR0 &= ~SACR0_ENB; |
260 | pxa_i2s_wait(); | |
f0fba2ad | 261 | if (clk_ena) { |
da9ff1f7 | 262 | clk_disable(clk_i2s); |
f0fba2ad | 263 | clk_ena = 0; |
da9ff1f7 | 264 | } |
3e7cc3d3 LG |
265 | } |
266 | } | |
267 | ||
268 | #ifdef CONFIG_PM | |
dc7d7b83 | 269 | static int pxa2xx_i2s_suspend(struct snd_soc_dai *dai) |
3e7cc3d3 | 270 | { |
3e7cc3d3 LG |
271 | /* store registers */ |
272 | pxa_i2s.sacr0 = SACR0; | |
273 | pxa_i2s.sacr1 = SACR1; | |
274 | pxa_i2s.saimr = SAIMR; | |
275 | pxa_i2s.sadiv = SADIV; | |
276 | ||
277 | /* deactivate link */ | |
278 | SACR0 &= ~SACR0_ENB; | |
279 | pxa_i2s_wait(); | |
280 | return 0; | |
281 | } | |
282 | ||
dc7d7b83 | 283 | static int pxa2xx_i2s_resume(struct snd_soc_dai *dai) |
3e7cc3d3 | 284 | { |
3e7cc3d3 LG |
285 | pxa_i2s_wait(); |
286 | ||
916465a8 | 287 | SACR0 = pxa_i2s.sacr0 & ~SACR0_ENB; |
3e7cc3d3 LG |
288 | SACR1 = pxa_i2s.sacr1; |
289 | SAIMR = pxa_i2s.saimr; | |
290 | SADIV = pxa_i2s.sadiv; | |
916465a8 KB |
291 | |
292 | SACR0 = pxa_i2s.sacr0; | |
3e7cc3d3 LG |
293 | |
294 | return 0; | |
295 | } | |
296 | ||
297 | #else | |
298 | #define pxa2xx_i2s_suspend NULL | |
299 | #define pxa2xx_i2s_resume NULL | |
300 | #endif | |
301 | ||
f0fba2ad LG |
302 | static int pxa2xx_i2s_probe(struct snd_soc_dai *dai) |
303 | { | |
304 | clk_i2s = clk_get(dai->dev, "I2SCLK"); | |
305 | if (IS_ERR(clk_i2s)) | |
306 | return PTR_ERR(clk_i2s); | |
307 | ||
308 | /* | |
309 | * PXA Developer's Manual: | |
310 | * If SACR0[ENB] is toggled in the middle of a normal operation, | |
311 | * the SACR0[RST] bit must also be set and cleared to reset all | |
312 | * I2S controller registers. | |
313 | */ | |
314 | SACR0 = SACR0_RST; | |
315 | SACR0 = 0; | |
316 | /* Make sure RPL and REC are disabled */ | |
317 | SACR1 = SACR1_DRPL | SACR1_DREC; | |
318 | /* Along with FIFO servicing */ | |
319 | SAIMR &= ~(SAIMR_RFS | SAIMR_TFS); | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | static int pxa2xx_i2s_remove(struct snd_soc_dai *dai) | |
325 | { | |
326 | clk_put(clk_i2s); | |
327 | clk_i2s = ERR_PTR(-ENOENT); | |
328 | return 0; | |
329 | } | |
330 | ||
eaff2ae7 PZ |
331 | #define PXA2XX_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\ |
332 | SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \ | |
333 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000) | |
3e7cc3d3 | 334 | |
6335d055 EM |
335 | static struct snd_soc_dai_ops pxa_i2s_dai_ops = { |
336 | .startup = pxa2xx_i2s_startup, | |
337 | .shutdown = pxa2xx_i2s_shutdown, | |
338 | .trigger = pxa2xx_i2s_trigger, | |
339 | .hw_params = pxa2xx_i2s_hw_params, | |
340 | .set_fmt = pxa2xx_i2s_set_dai_fmt, | |
341 | .set_sysclk = pxa2xx_i2s_set_dai_sysclk, | |
342 | }; | |
343 | ||
f0fba2ad LG |
344 | static struct snd_soc_dai_driver pxa_i2s_dai = { |
345 | .probe = pxa2xx_i2s_probe, | |
346 | .remove = pxa2xx_i2s_remove, | |
3e7cc3d3 LG |
347 | .suspend = pxa2xx_i2s_suspend, |
348 | .resume = pxa2xx_i2s_resume, | |
3e7cc3d3 LG |
349 | .playback = { |
350 | .channels_min = 2, | |
eaff2ae7 PZ |
351 | .channels_max = 2, |
352 | .rates = PXA2XX_I2S_RATES, | |
353 | .formats = SNDRV_PCM_FMTBIT_S16_LE,}, | |
3e7cc3d3 LG |
354 | .capture = { |
355 | .channels_min = 2, | |
eaff2ae7 PZ |
356 | .channels_max = 2, |
357 | .rates = PXA2XX_I2S_RATES, | |
358 | .formats = SNDRV_PCM_FMTBIT_S16_LE,}, | |
6335d055 | 359 | .ops = &pxa_i2s_dai_ops, |
7de0a0ae | 360 | .symmetric_rates = 1, |
3e7cc3d3 LG |
361 | }; |
362 | ||
f0fba2ad | 363 | static int pxa2xx_i2s_drv_probe(struct platform_device *pdev) |
6e5ea701 | 364 | { |
f0fba2ad | 365 | return snd_soc_register_dai(&pdev->dev, &pxa_i2s_dai); |
6e5ea701 DES |
366 | } |
367 | ||
f0fba2ad | 368 | static int __devexit pxa2xx_i2s_drv_remove(struct platform_device *pdev) |
6e5ea701 | 369 | { |
f0fba2ad | 370 | snd_soc_unregister_dai(&pdev->dev); |
6e5ea701 DES |
371 | return 0; |
372 | } | |
373 | ||
374 | static struct platform_driver pxa2xx_i2s_driver = { | |
f0fba2ad LG |
375 | .probe = pxa2xx_i2s_drv_probe, |
376 | .remove = __devexit_p(pxa2xx_i2s_drv_remove), | |
6e5ea701 DES |
377 | |
378 | .driver = { | |
379 | .name = "pxa2xx-i2s", | |
380 | .owner = THIS_MODULE, | |
381 | }, | |
382 | }; | |
383 | ||
384 | static int __init pxa2xx_i2s_init(void) | |
385 | { | |
386 | clk_i2s = ERR_PTR(-ENOENT); | |
387 | return platform_driver_register(&pxa2xx_i2s_driver); | |
388 | } | |
389 | ||
390 | static void __exit pxa2xx_i2s_exit(void) | |
391 | { | |
392 | platform_driver_unregister(&pxa2xx_i2s_driver); | |
393 | } | |
394 | ||
395 | module_init(pxa2xx_i2s_init); | |
396 | module_exit(pxa2xx_i2s_exit); | |
397 | ||
3e7cc3d3 | 398 | /* Module information */ |
d331124d | 399 | MODULE_AUTHOR("Liam Girdwood, lrg@slimlogic.co.uk"); |
3e7cc3d3 LG |
400 | MODULE_DESCRIPTION("pxa2xx I2S SoC Interface"); |
401 | MODULE_LICENSE("GPL"); |