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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * pxa2xx-i2s.c -- ALSA Soc Audio Layer
4 *
5 * Copyright 2005 Wolfson Microelectronics PLC.
6 * Author: Liam Girdwood
7 * lrg@slimlogic.co.uk
8 */
9
10#include <linux/init.h>
11#include <linux/module.h>
12#include <linux/device.h>
13#include <linux/delay.h>
14#include <linux/clk.h>
15#include <linux/platform_device.h>
16#include <linux/io.h>
17#include <sound/core.h>
18#include <sound/pcm.h>
19#include <sound/initval.h>
20#include <sound/soc.h>
21#include <sound/pxa2xx-lib.h>
22#include <sound/dmaengine_pcm.h>
23
24#include <linux/platform_data/asoc-pxa.h>
25
26#include "pxa2xx-i2s.h"
27
28/*
29 * I2S Controller Register and Bit Definitions
30 */
31#define SACR0 (0x0000) /* Global Control Register */
32#define SACR1 (0x0004) /* Serial Audio I 2 S/MSB-Justified Control Register */
33#define SASR0 (0x000C) /* Serial Audio I 2 S/MSB-Justified Interface and FIFO Status Register */
34#define SAIMR (0x0014) /* Serial Audio Interrupt Mask Register */
35#define SAICR (0x0018) /* Serial Audio Interrupt Clear Register */
36#define SADIV (0x0060) /* Audio Clock Divider Register. */
37#define SADR (0x0080) /* Serial Audio Data Register (TX and RX FIFO access Register). */
38
39#define SACR0_RFTH(x) ((x) << 12) /* Rx FIFO Interrupt or DMA Trigger Threshold */
40#define SACR0_TFTH(x) ((x) << 8) /* Tx FIFO Interrupt or DMA Trigger Threshold */
41#define SACR0_STRF (1 << 5) /* FIFO Select for EFWR Special Function */
42#define SACR0_EFWR (1 << 4) /* Enable EFWR Function */
43#define SACR0_RST (1 << 3) /* FIFO, i2s Register Reset */
44#define SACR0_BCKD (1 << 2) /* Bit Clock Direction */
45#define SACR0_ENB (1 << 0) /* Enable I2S Link */
46#define SACR1_ENLBF (1 << 5) /* Enable Loopback */
47#define SACR1_DRPL (1 << 4) /* Disable Replaying Function */
48#define SACR1_DREC (1 << 3) /* Disable Recording Function */
49#define SACR1_AMSL (1 << 0) /* Specify Alternate Mode */
50
51#define SASR0_I2SOFF (1 << 7) /* Controller Status */
52#define SASR0_ROR (1 << 6) /* Rx FIFO Overrun */
53#define SASR0_TUR (1 << 5) /* Tx FIFO Underrun */
54#define SASR0_RFS (1 << 4) /* Rx FIFO Service Request */
55#define SASR0_TFS (1 << 3) /* Tx FIFO Service Request */
56#define SASR0_BSY (1 << 2) /* I2S Busy */
57#define SASR0_RNE (1 << 1) /* Rx FIFO Not Empty */
58#define SASR0_TNF (1 << 0) /* Tx FIFO Not Empty */
59
60#define SAICR_ROR (1 << 6) /* Clear Rx FIFO Overrun Interrupt */
61#define SAICR_TUR (1 << 5) /* Clear Tx FIFO Underrun Interrupt */
62
63#define SAIMR_ROR (1 << 6) /* Enable Rx FIFO Overrun Condition Interrupt */
64#define SAIMR_TUR (1 << 5) /* Enable Tx FIFO Underrun Condition Interrupt */
65#define SAIMR_RFS (1 << 4) /* Enable Rx FIFO Service Interrupt */
66#define SAIMR_TFS (1 << 3) /* Enable Tx FIFO Service Interrupt */
67
68struct pxa_i2s_port {
69 u32 sadiv;
70 u32 sacr0;
71 u32 sacr1;
72 u32 saimr;
73 int master;
74 u32 fmt;
75};
76static struct pxa_i2s_port pxa_i2s;
77static struct clk *clk_i2s;
78static int clk_ena = 0;
79static void __iomem *i2s_reg_base;
80
81static struct snd_dmaengine_dai_dma_data pxa2xx_i2s_pcm_stereo_out = {
82 .addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
83 .chan_name = "tx",
84 .maxburst = 32,
85};
86
87static struct snd_dmaengine_dai_dma_data pxa2xx_i2s_pcm_stereo_in = {
88 .addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
89 .chan_name = "rx",
90 .maxburst = 32,
91};
92
93static int pxa2xx_i2s_startup(struct snd_pcm_substream *substream,
94 struct snd_soc_dai *dai)
95{
96 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
97 struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
98
99 if (IS_ERR(clk_i2s))
100 return PTR_ERR(clk_i2s);
101
102 if (!snd_soc_dai_active(cpu_dai))
103 writel(0, i2s_reg_base + SACR0);
104
105 return 0;
106}
107
108/* wait for I2S controller to be ready */
109static int pxa_i2s_wait(void)
110{
111 int i;
112
113 /* flush the Rx FIFO */
114 for (i = 0; i < 16; i++)
115 readl(i2s_reg_base + SADR);
116 return 0;
117}
118
119static int pxa2xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
120 unsigned int fmt)
121{
122 /* interface format */
123 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
124 case SND_SOC_DAIFMT_I2S:
125 pxa_i2s.fmt = 0;
126 break;
127 case SND_SOC_DAIFMT_LEFT_J:
128 pxa_i2s.fmt = SACR1_AMSL;
129 break;
130 }
131
132 switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
133 case SND_SOC_DAIFMT_BP_FP:
134 pxa_i2s.master = 1;
135 break;
136 case SND_SOC_DAIFMT_BC_FP:
137 pxa_i2s.master = 0;
138 break;
139 default:
140 break;
141 }
142 return 0;
143}
144
145static int pxa2xx_i2s_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
146 int clk_id, unsigned int freq, int dir)
147{
148 if (clk_id != PXA2XX_I2S_SYSCLK)
149 return -ENODEV;
150
151 return 0;
152}
153
154static int pxa2xx_i2s_hw_params(struct snd_pcm_substream *substream,
155 struct snd_pcm_hw_params *params,
156 struct snd_soc_dai *dai)
157{
158 struct snd_dmaengine_dai_dma_data *dma_data;
159
160 if (WARN_ON(IS_ERR(clk_i2s)))
161 return -EINVAL;
162 clk_prepare_enable(clk_i2s);
163 clk_ena = 1;
164 pxa_i2s_wait();
165
166 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
167 dma_data = &pxa2xx_i2s_pcm_stereo_out;
168 else
169 dma_data = &pxa2xx_i2s_pcm_stereo_in;
170
171 snd_soc_dai_set_dma_data(dai, substream, dma_data);
172
173 /* is port used by another stream */
174 if (!(SACR0 & SACR0_ENB)) {
175 writel(0, i2s_reg_base + SACR0);
176 if (pxa_i2s.master)
177 writel(readl(i2s_reg_base + SACR0) | (SACR0_BCKD), i2s_reg_base + SACR0);
178
179 writel(readl(i2s_reg_base + SACR0) | (SACR0_RFTH(14) | SACR0_TFTH(1)), i2s_reg_base + SACR0);
180 writel(readl(i2s_reg_base + SACR1) | (pxa_i2s.fmt), i2s_reg_base + SACR1);
181 }
182 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
183 writel(readl(i2s_reg_base + SAIMR) | (SAIMR_TFS), i2s_reg_base + SAIMR);
184 else
185 writel(readl(i2s_reg_base + SAIMR) | (SAIMR_RFS), i2s_reg_base + SAIMR);
186
187 switch (params_rate(params)) {
188 case 8000:
189 writel(0x48, i2s_reg_base + SADIV);
190 break;
191 case 11025:
192 writel(0x34, i2s_reg_base + SADIV);
193 break;
194 case 16000:
195 writel(0x24, i2s_reg_base + SADIV);
196 break;
197 case 22050:
198 writel(0x1a, i2s_reg_base + SADIV);
199 break;
200 case 44100:
201 writel(0xd, i2s_reg_base + SADIV);
202 break;
203 case 48000:
204 writel(0xc, i2s_reg_base + SADIV);
205 break;
206 case 96000: /* not in manual and possibly slightly inaccurate */
207 writel(0x6, i2s_reg_base + SADIV);
208 break;
209 }
210
211 return 0;
212}
213
214static int pxa2xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
215 struct snd_soc_dai *dai)
216{
217 int ret = 0;
218
219 switch (cmd) {
220 case SNDRV_PCM_TRIGGER_START:
221 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
222 writel(readl(i2s_reg_base + SACR1) & (~SACR1_DRPL), i2s_reg_base + SACR1);
223 else
224 writel(readl(i2s_reg_base + SACR1) & (~SACR1_DREC), i2s_reg_base + SACR1);
225 writel(readl(i2s_reg_base + SACR0) | (SACR0_ENB), i2s_reg_base + SACR0);
226 break;
227 case SNDRV_PCM_TRIGGER_RESUME:
228 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
229 case SNDRV_PCM_TRIGGER_STOP:
230 case SNDRV_PCM_TRIGGER_SUSPEND:
231 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
232 break;
233 default:
234 ret = -EINVAL;
235 }
236
237 return ret;
238}
239
240static void pxa2xx_i2s_shutdown(struct snd_pcm_substream *substream,
241 struct snd_soc_dai *dai)
242{
243 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
244 writel(readl(i2s_reg_base + SACR1) | (SACR1_DRPL), i2s_reg_base + SACR1);
245 writel(readl(i2s_reg_base + SAIMR) & (~SAIMR_TFS), i2s_reg_base + SAIMR);
246 } else {
247 writel(readl(i2s_reg_base + SACR1) | (SACR1_DREC), i2s_reg_base + SACR1);
248 writel(readl(i2s_reg_base + SAIMR) & (~SAIMR_RFS), i2s_reg_base + SAIMR);
249 }
250
251 if ((readl(i2s_reg_base + SACR1) & (SACR1_DREC | SACR1_DRPL)) == (SACR1_DREC | SACR1_DRPL)) {
252 writel(readl(i2s_reg_base + SACR0) & (~SACR0_ENB), i2s_reg_base + SACR0);
253 pxa_i2s_wait();
254 if (clk_ena) {
255 clk_disable_unprepare(clk_i2s);
256 clk_ena = 0;
257 }
258 }
259}
260
261#ifdef CONFIG_PM
262static int pxa2xx_soc_pcm_suspend(struct snd_soc_component *component)
263{
264 /* store registers */
265 pxa_i2s.sacr0 = readl(i2s_reg_base + SACR0);
266 pxa_i2s.sacr1 = readl(i2s_reg_base + SACR1);
267 pxa_i2s.saimr = readl(i2s_reg_base + SAIMR);
268 pxa_i2s.sadiv = readl(i2s_reg_base + SADIV);
269
270 /* deactivate link */
271 writel(readl(i2s_reg_base + SACR0) & (~SACR0_ENB), i2s_reg_base + SACR0);
272 pxa_i2s_wait();
273 return 0;
274}
275
276static int pxa2xx_soc_pcm_resume(struct snd_soc_component *component)
277{
278 pxa_i2s_wait();
279
280 writel(pxa_i2s.sacr0 & ~SACR0_ENB, i2s_reg_base + SACR0);
281 writel(pxa_i2s.sacr1, i2s_reg_base + SACR1);
282 writel(pxa_i2s.saimr, i2s_reg_base + SAIMR);
283 writel(pxa_i2s.sadiv, i2s_reg_base + SADIV);
284
285 writel(pxa_i2s.sacr0, i2s_reg_base + SACR0);
286
287 return 0;
288}
289
290#else
291#define pxa2xx_soc_pcm_suspend NULL
292#define pxa2xx_soc_pcm_resume NULL
293#endif
294
295static int pxa2xx_i2s_probe(struct snd_soc_dai *dai)
296{
297 clk_i2s = clk_get(dai->dev, "I2SCLK");
298 if (IS_ERR(clk_i2s))
299 return PTR_ERR(clk_i2s);
300
301 /*
302 * PXA Developer's Manual:
303 * If SACR0[ENB] is toggled in the middle of a normal operation,
304 * the SACR0[RST] bit must also be set and cleared to reset all
305 * I2S controller registers.
306 */
307 writel(SACR0_RST, i2s_reg_base + SACR0);
308 writel(0, i2s_reg_base + SACR0);
309 /* Make sure RPL and REC are disabled */
310 writel(SACR1_DRPL | SACR1_DREC, i2s_reg_base + SACR1);
311 /* Along with FIFO servicing */
312 writel(readl(i2s_reg_base + SAIMR) & (~(SAIMR_RFS | SAIMR_TFS)), i2s_reg_base + SAIMR);
313
314 snd_soc_dai_init_dma_data(dai, &pxa2xx_i2s_pcm_stereo_out,
315 &pxa2xx_i2s_pcm_stereo_in);
316
317 return 0;
318}
319
320static int pxa2xx_i2s_remove(struct snd_soc_dai *dai)
321{
322 clk_put(clk_i2s);
323 clk_i2s = ERR_PTR(-ENOENT);
324 return 0;
325}
326
327#define PXA2XX_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
328 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \
329 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
330
331static const struct snd_soc_dai_ops pxa_i2s_dai_ops = {
332 .probe = pxa2xx_i2s_probe,
333 .remove = pxa2xx_i2s_remove,
334 .startup = pxa2xx_i2s_startup,
335 .shutdown = pxa2xx_i2s_shutdown,
336 .trigger = pxa2xx_i2s_trigger,
337 .hw_params = pxa2xx_i2s_hw_params,
338 .set_fmt = pxa2xx_i2s_set_dai_fmt,
339 .set_sysclk = pxa2xx_i2s_set_dai_sysclk,
340};
341
342static struct snd_soc_dai_driver pxa_i2s_dai = {
343 .playback = {
344 .channels_min = 2,
345 .channels_max = 2,
346 .rates = PXA2XX_I2S_RATES,
347 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
348 .capture = {
349 .channels_min = 2,
350 .channels_max = 2,
351 .rates = PXA2XX_I2S_RATES,
352 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
353 .ops = &pxa_i2s_dai_ops,
354 .symmetric_rate = 1,
355};
356
357static const struct snd_soc_component_driver pxa_i2s_component = {
358 .name = "pxa-i2s",
359 .pcm_construct = pxa2xx_soc_pcm_new,
360 .open = pxa2xx_soc_pcm_open,
361 .close = pxa2xx_soc_pcm_close,
362 .hw_params = pxa2xx_soc_pcm_hw_params,
363 .prepare = pxa2xx_soc_pcm_prepare,
364 .trigger = pxa2xx_soc_pcm_trigger,
365 .pointer = pxa2xx_soc_pcm_pointer,
366 .suspend = pxa2xx_soc_pcm_suspend,
367 .resume = pxa2xx_soc_pcm_resume,
368 .legacy_dai_naming = 1,
369};
370
371static int pxa2xx_i2s_drv_probe(struct platform_device *pdev)
372{
373 struct resource *res;
374
375 i2s_reg_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
376 if (IS_ERR(i2s_reg_base))
377 return PTR_ERR(i2s_reg_base);
378
379 pxa2xx_i2s_pcm_stereo_out.addr = res->start + SADR;
380 pxa2xx_i2s_pcm_stereo_in.addr = res->start + SADR;
381
382 return devm_snd_soc_register_component(&pdev->dev, &pxa_i2s_component,
383 &pxa_i2s_dai, 1);
384}
385
386static struct platform_driver pxa2xx_i2s_driver = {
387 .probe = pxa2xx_i2s_drv_probe,
388
389 .driver = {
390 .name = "pxa2xx-i2s",
391 },
392};
393
394static int __init pxa2xx_i2s_init(void)
395{
396 clk_i2s = ERR_PTR(-ENOENT);
397 return platform_driver_register(&pxa2xx_i2s_driver);
398}
399
400static void __exit pxa2xx_i2s_exit(void)
401{
402 platform_driver_unregister(&pxa2xx_i2s_driver);
403}
404
405module_init(pxa2xx_i2s_init);
406module_exit(pxa2xx_i2s_exit);
407
408/* Module information */
409MODULE_AUTHOR("Liam Girdwood, lrg@slimlogic.co.uk");
410MODULE_DESCRIPTION("pxa2xx I2S SoC Interface");
411MODULE_LICENSE("GPL");
412MODULE_ALIAS("platform:pxa2xx-i2s");
1/*
2 * pxa2xx-i2s.c -- ALSA Soc Audio Layer
3 *
4 * Copyright 2005 Wolfson Microelectronics PLC.
5 * Author: Liam Girdwood
6 * lrg@slimlogic.co.uk
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.
12 */
13
14#include <linux/init.h>
15#include <linux/module.h>
16#include <linux/device.h>
17#include <linux/delay.h>
18#include <linux/clk.h>
19#include <linux/platform_device.h>
20#include <linux/io.h>
21#include <sound/core.h>
22#include <sound/pcm.h>
23#include <sound/initval.h>
24#include <sound/soc.h>
25#include <sound/pxa2xx-lib.h>
26
27#include <mach/hardware.h>
28#include <mach/dma.h>
29#include <mach/audio.h>
30
31#include "pxa2xx-i2s.h"
32
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 */
72
73struct pxa_i2s_port {
74 u32 sadiv;
75 u32 sacr0;
76 u32 sacr1;
77 u32 saimr;
78 int master;
79 u32 fmt;
80};
81static struct pxa_i2s_port pxa_i2s;
82static struct clk *clk_i2s;
83static int clk_ena = 0;
84
85static struct pxa2xx_pcm_dma_params pxa2xx_i2s_pcm_stereo_out = {
86 .name = "I2S PCM Stereo out",
87 .dev_addr = __PREG(SADR),
88 .drcmr = &DRCMR(3),
89 .dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG |
90 DCMD_BURST32 | DCMD_WIDTH4,
91};
92
93static struct pxa2xx_pcm_dma_params pxa2xx_i2s_pcm_stereo_in = {
94 .name = "I2S PCM Stereo in",
95 .dev_addr = __PREG(SADR),
96 .drcmr = &DRCMR(2),
97 .dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC |
98 DCMD_BURST32 | DCMD_WIDTH4,
99};
100
101static int pxa2xx_i2s_startup(struct snd_pcm_substream *substream,
102 struct snd_soc_dai *dai)
103{
104 struct snd_soc_pcm_runtime *rtd = substream->private_data;
105 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
106
107 if (IS_ERR(clk_i2s))
108 return PTR_ERR(clk_i2s);
109
110 if (!cpu_dai->active)
111 SACR0 = 0;
112
113 return 0;
114}
115
116/* wait for I2S controller to be ready */
117static 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
127static int pxa2xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
128 unsigned int fmt)
129{
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 }
139
140 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
141 case SND_SOC_DAIFMT_CBS_CFS:
142 pxa_i2s.master = 1;
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}
152
153static int pxa2xx_i2s_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
154 int clk_id, unsigned int freq, int dir)
155{
156 if (clk_id != PXA2XX_I2S_SYSCLK)
157 return -ENODEV;
158
159 return 0;
160}
161
162static int pxa2xx_i2s_hw_params(struct snd_pcm_substream *substream,
163 struct snd_pcm_hw_params *params,
164 struct snd_soc_dai *dai)
165{
166 struct pxa2xx_pcm_dma_params *dma_data;
167
168 BUG_ON(IS_ERR(clk_i2s));
169 clk_prepare_enable(clk_i2s);
170 clk_ena = 1;
171 pxa_i2s_wait();
172
173 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
174 dma_data = &pxa2xx_i2s_pcm_stereo_out;
175 else
176 dma_data = &pxa2xx_i2s_pcm_stereo_in;
177
178 snd_soc_dai_set_dma_data(dai, substream, dma_data);
179
180 /* is port used by another stream */
181 if (!(SACR0 & SACR0_ENB)) {
182 SACR0 = 0;
183 if (pxa_i2s.master)
184 SACR0 |= SACR0_BCKD;
185
186 SACR0 |= SACR0_RFTH(14) | SACR0_TFTH(1);
187 SACR1 |= pxa_i2s.fmt;
188 }
189 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
190 SAIMR |= SAIMR_TFS;
191 else
192 SAIMR |= SAIMR_RFS;
193
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
218 return 0;
219}
220
221static int pxa2xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
222 struct snd_soc_dai *dai)
223{
224 int ret = 0;
225
226 switch (cmd) {
227 case SNDRV_PCM_TRIGGER_START:
228 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
229 SACR1 &= ~SACR1_DRPL;
230 else
231 SACR1 &= ~SACR1_DREC;
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
247static void pxa2xx_i2s_shutdown(struct snd_pcm_substream *substream,
248 struct snd_soc_dai *dai)
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
258 if ((SACR1 & (SACR1_DREC | SACR1_DRPL)) == (SACR1_DREC | SACR1_DRPL)) {
259 SACR0 &= ~SACR0_ENB;
260 pxa_i2s_wait();
261 if (clk_ena) {
262 clk_disable_unprepare(clk_i2s);
263 clk_ena = 0;
264 }
265 }
266}
267
268#ifdef CONFIG_PM
269static int pxa2xx_i2s_suspend(struct snd_soc_dai *dai)
270{
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
283static int pxa2xx_i2s_resume(struct snd_soc_dai *dai)
284{
285 pxa_i2s_wait();
286
287 SACR0 = pxa_i2s.sacr0 & ~SACR0_ENB;
288 SACR1 = pxa_i2s.sacr1;
289 SAIMR = pxa_i2s.saimr;
290 SADIV = pxa_i2s.sadiv;
291
292 SACR0 = pxa_i2s.sacr0;
293
294 return 0;
295}
296
297#else
298#define pxa2xx_i2s_suspend NULL
299#define pxa2xx_i2s_resume NULL
300#endif
301
302static 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
324static 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
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)
334
335static const 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
344static struct snd_soc_dai_driver pxa_i2s_dai = {
345 .probe = pxa2xx_i2s_probe,
346 .remove = pxa2xx_i2s_remove,
347 .suspend = pxa2xx_i2s_suspend,
348 .resume = pxa2xx_i2s_resume,
349 .playback = {
350 .channels_min = 2,
351 .channels_max = 2,
352 .rates = PXA2XX_I2S_RATES,
353 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
354 .capture = {
355 .channels_min = 2,
356 .channels_max = 2,
357 .rates = PXA2XX_I2S_RATES,
358 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
359 .ops = &pxa_i2s_dai_ops,
360 .symmetric_rates = 1,
361};
362
363static int pxa2xx_i2s_drv_probe(struct platform_device *pdev)
364{
365 return snd_soc_register_dai(&pdev->dev, &pxa_i2s_dai);
366}
367
368static int __devexit pxa2xx_i2s_drv_remove(struct platform_device *pdev)
369{
370 snd_soc_unregister_dai(&pdev->dev);
371 return 0;
372}
373
374static struct platform_driver pxa2xx_i2s_driver = {
375 .probe = pxa2xx_i2s_drv_probe,
376 .remove = __devexit_p(pxa2xx_i2s_drv_remove),
377
378 .driver = {
379 .name = "pxa2xx-i2s",
380 .owner = THIS_MODULE,
381 },
382};
383
384static int __init pxa2xx_i2s_init(void)
385{
386 clk_i2s = ERR_PTR(-ENOENT);
387 return platform_driver_register(&pxa2xx_i2s_driver);
388}
389
390static void __exit pxa2xx_i2s_exit(void)
391{
392 platform_driver_unregister(&pxa2xx_i2s_driver);
393}
394
395module_init(pxa2xx_i2s_init);
396module_exit(pxa2xx_i2s_exit);
397
398/* Module information */
399MODULE_AUTHOR("Liam Girdwood, lrg@slimlogic.co.uk");
400MODULE_DESCRIPTION("pxa2xx I2S SoC Interface");
401MODULE_LICENSE("GPL");
402MODULE_ALIAS("platform:pxa2xx-i2s");