1 /*
2 * eti_b1_wm8731 -- SoC audio for AT91RM9200-based Endrelia ETI_B1 board.
3 *
4 * Author: Frank Mandarino <fmandarino@endrelia.com>
5 * Endrelia Technologies Inc.
6 * Created: Mar 29, 2006
7 *
8 * Based on corgi.c by:
9 *
10 * Copyright 2005 Wolfson Microelectronics PLC.
11 * Copyright 2005 Openedhand Ltd.
12 *
13 * Authors: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
14 * Richard Purdie <richard@openedhand.com>
15 *
16 * This program is free software; you can redistribute it and/or modify it
17 * under the terms of the GNU General Public License as published by the
18 * Free Software Foundation; either version 2 of the License, or (at your
19 * option) any later version.
20 *
21 */
22
23 #include <linux/module.h>
24 #include <linux/moduleparam.h>
25 #include <linux/version.h>
26 #include <linux/kernel.h>
27 #include <linux/clk.h>
28 #include <linux/timer.h>
29 #include <linux/interrupt.h>
30 #include <linux/platform_device.h>
31 #include <sound/core.h>
32 #include <sound/pcm.h>
33 #include <sound/soc.h>
34 #include <sound/soc-dapm.h>
35
36 #include <asm/arch/hardware.h>
37 #include <asm/arch/at91_pio.h>
38 #include <asm/arch/gpio.h>
39
40 #include "../codecs/wm8731.h"
41 #include "at91-pcm.h"
42 #include "at91-ssc.h"
43
44 #if 0
45 #define DBG(x...) printk(KERN_INFO "eti_b1_wm8731: " x)
46 #else
47 #define DBG(x...)
48 #endif
49
50 #define AT91_PIO_TF1 (1 << (AT91_PIN_PB6 - PIN_BASE) % 32)
51 #define AT91_PIO_TK1 (1 << (AT91_PIN_PB7 - PIN_BASE) % 32)
52 #define AT91_PIO_TD1 (1 << (AT91_PIN_PB8 - PIN_BASE) % 32)
53 #define AT91_PIO_RD1 (1 << (AT91_PIN_PB9 - PIN_BASE) % 32)
54 #define AT91_PIO_RK1 (1 << (AT91_PIN_PB10 - PIN_BASE) % 32)
55 #define AT91_PIO_RF1 (1 << (AT91_PIN_PB11 - PIN_BASE) % 32)
56
57 static struct clk *pck1_clk;
58 static struct clk *pllb_clk;
59
60
61 static int eti_b1_startup(struct snd_pcm_substream *substream)
62 {
63 struct snd_soc_pcm_runtime *rtd = substream->private_data;
64 struct snd_soc_codec_dai *codec_dai = rtd->dai->codec_dai;
65 struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
66 int ret;
67
68 /* cpu clock is the AT91 master clock sent to the SSC */
69 ret = cpu_dai->dai_ops.set_sysclk(cpu_dai, AT91_SYSCLK_MCK,
70 60000000, SND_SOC_CLOCK_IN);
71 if (ret < 0)
72 return ret;
73
74 /* codec system clock is supplied by PCK1, set to 12MHz */
75 ret = codec_dai->dai_ops.set_sysclk(codec_dai, WM8731_SYSCLK,
76 12000000, SND_SOC_CLOCK_IN);
77 if (ret < 0)
78 return ret;
79
80 /* Start PCK1 clock. */
81 clk_enable(pck1_clk);
82 DBG("pck1 started\n");
83
84 return 0;
85 }
86
87 static void eti_b1_shutdown(struct snd_pcm_substream *substream)
88 {
89 /* Stop PCK1 clock. */
90 clk_disable(pck1_clk);
91 DBG("pck1 stopped\n");
92 }
93
94 static int eti_b1_hw_params(struct snd_pcm_substream *substream,
95 struct snd_pcm_hw_params *params)
96 {
97 struct snd_soc_pcm_runtime *rtd = substream->private_data;
98 struct snd_soc_codec_dai *codec_dai = rtd->dai->codec_dai;
99 struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
100 int ret;
101
102 #ifdef CONFIG_SND_AT91_SOC_ETI_SLAVE
103 unsigned int rate;
104 int cmr_div, period;
105
106 /* set codec DAI configuration */
107 ret = codec_dai->dai_ops.set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
108 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
109 if (ret < 0)
110 return ret;
111
112 /* set cpu DAI configuration */
113 ret = cpu_dai->dai_ops.set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
114 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
115 if (ret < 0)
116 return ret;
117
118 /*
119 * The SSC clock dividers depend on the sample rate. The CMR.DIV
120 * field divides the system master clock MCK to drive the SSC TK
121 * signal which provides the codec BCLK. The TCMR.PERIOD and
122 * RCMR.PERIOD fields further divide the BCLK signal to drive
123 * the SSC TF and RF signals which provide the codec DACLRC and
124 * ADCLRC clocks.
125 *
126 * The dividers were determined through trial and error, where a
127 * CMR.DIV value is chosen such that the resulting BCLK value is
128 * divisible, or almost divisible, by (2 * sample rate), and then
129 * the TCMR.PERIOD or RCMR.PERIOD is BCLK / (2 * sample rate) - 1.
130 */
131 rate = params_rate(params);
132
133 switch (rate) {
134 case 8000:
135 cmr_div = 25; /* BCLK = 60MHz/(2*25) = 1.2MHz */
136 period = 74; /* LRC = BCLK/(2*(74+1)) = 8000Hz */
137 break;
138 case 32000:
139 cmr_div = 7; /* BCLK = 60MHz/(2*7) ~= 4.28571428MHz */
140 period = 66; /* LRC = BCLK/(2*(66+1)) = 31982.942Hz */
141 break;
142 case 48000:
143 cmr_div = 13; /* BCLK = 60MHz/(2*13) ~= 2.3076923MHz */
144 period = 23; /* LRC = BCLK/(2*(23+1)) = 48076.923Hz */
145 break;
146 default:
147 printk(KERN_WARNING "unsupported rate %d on ETI-B1 board\n", rate);
148 return -EINVAL;
149 }
150
151 /* set the MCK divider for BCLK */
152 ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, AT91SSC_CMR_DIV, cmr_div);
153 if (ret < 0)
154 return ret;
155
156 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
157 /* set the BCLK divider for DACLRC */
158 ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai,
159 AT91SSC_TCMR_PERIOD, period);
160 } else {
161 /* set the BCLK divider for ADCLRC */
162 ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai,
163 AT91SSC_RCMR_PERIOD, period);
164 }
165 if (ret < 0)
166 return ret;
167
168 #else /* CONFIG_SND_AT91_SOC_ETI_SLAVE */
169 /*
170 * Codec in Master Mode.
171 */
172
173 /* set codec DAI configuration */
174 ret = codec_dai->dai_ops.set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
175 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
176 if (ret < 0)
177 return ret;
178
179 /* set cpu DAI configuration */
180 ret = cpu_dai->dai_ops.set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
181 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
182 if (ret < 0)
183 return ret;
184
185 #endif /* CONFIG_SND_AT91_SOC_ETI_SLAVE */
186
187 return 0;
188 }
189
190 static struct snd_soc_ops eti_b1_ops = {
191 .startup = eti_b1_startup,
192 .hw_params = eti_b1_hw_params,
193 .shutdown = eti_b1_shutdown,
194 };
195
196
197 static const struct snd_soc_dapm_widget eti_b1_dapm_widgets[] = {
198 SND_SOC_DAPM_MIC("Int Mic", NULL),
199 SND_SOC_DAPM_SPK("Ext Spk", NULL),
200 };
201
202 static const char *intercon[][3] = {
203
204 /* speaker connected to LHPOUT */
205 {"Ext Spk", NULL, "LHPOUT"},
206
207 /* mic is connected to Mic Jack, with WM8731 Mic Bias */
208 {"MICIN", NULL, "Mic Bias"},
209 {"Mic Bias", NULL, "Int Mic"},
210
211 /* terminator */
212 {NULL, NULL, NULL},
213 };
214
215 /*
216 * Logic for a wm8731 as connected on a Endrelia ETI-B1 board.
217 */
218 static int eti_b1_wm8731_init(struct snd_soc_codec *codec)
219 {
220 int i;
221
222 DBG("eti_b1_wm8731_init() called\n");
223
224 /* Add specific widgets */
225 for(i = 0; i < ARRAY_SIZE(eti_b1_dapm_widgets); i++) {
226 snd_soc_dapm_new_control(codec, &eti_b1_dapm_widgets[i]);
227 }
228
229 /* Set up specific audio path interconnects */
230 for(i = 0; intercon[i][0] != NULL; i++) {
231 snd_soc_dapm_connect_input(codec, intercon[i][0],
232 intercon[i][1], intercon[i][2]);
233 }
234
235 /* not connected */
236 snd_soc_dapm_set_endpoint(codec, "RLINEIN", 0);
237 snd_soc_dapm_set_endpoint(codec, "LLINEIN", 0);
238
239 /* always connected */
240 snd_soc_dapm_set_endpoint(codec, "Int Mic", 1);
241 snd_soc_dapm_set_endpoint(codec, "Ext Spk", 1);
242
243 snd_soc_dapm_sync_endpoints(codec);
244
245 return 0;
246 }
247
248 static struct snd_soc_dai_link eti_b1_dai = {
249 .name = "WM8731",
250 .stream_name = "WM8731 PCM",
251 .cpu_dai = &at91_ssc_dai[1],
252 .codec_dai = &wm8731_dai,
253 .init = eti_b1_wm8731_init,
254 .ops = &eti_b1_ops,
255 };
256
257 static struct snd_soc_machine snd_soc_machine_eti_b1 = {
258 .name = "ETI_B1_WM8731",
259 .dai_link = &eti_b1_dai,
260 .num_links = 1,
261 };
262
263 static struct wm8731_setup_data eti_b1_wm8731_setup = {
264 .i2c_address = 0x1a,
265 };
266
267 static struct snd_soc_device eti_b1_snd_devdata = {
268 .machine = &snd_soc_machine_eti_b1,
269 .platform = &at91_soc_platform,
270 .codec_dev = &soc_codec_dev_wm8731,
271 .codec_data = &eti_b1_wm8731_setup,
272 };
273
274 static struct platform_device *eti_b1_snd_device;
275
276 static int __init eti_b1_init(void)
277 {
278 int ret;
279 u32 ssc_pio_lines;
280 struct at91_ssc_periph *ssc = eti_b1_dai.cpu_dai->private_data;
281
282 if (!request_mem_region(AT91RM9200_BASE_SSC1, SZ_16K, "soc-audio")) {
283 DBG("SSC1 memory region is busy\n");
284 return -EBUSY;
285 }
286
287 ssc->base = ioremap(AT91RM9200_BASE_SSC1, SZ_16K);
288 if (!ssc->base) {
289 DBG("SSC1 memory ioremap failed\n");
290 ret = -ENOMEM;
291 goto fail_release_mem;
292 }
293
294 ssc->pid = AT91RM9200_ID_SSC1;
295
296 eti_b1_snd_device = platform_device_alloc("soc-audio", -1);
297 if (!eti_b1_snd_device) {
298 DBG("platform device allocation failed\n");
299 ret = -ENOMEM;
300 goto fail_io_unmap;
301 }
302
303 platform_set_drvdata(eti_b1_snd_device, &eti_b1_snd_devdata);
304 eti_b1_snd_devdata.dev = &eti_b1_snd_device->dev;
305
306 ret = platform_device_add(eti_b1_snd_device);
307 if (ret) {
308 DBG("platform device add failed\n");
309 platform_device_put(eti_b1_snd_device);
310 goto fail_io_unmap;
311 }
312
313 ssc_pio_lines = AT91_PIO_TF1 | AT91_PIO_TK1 | AT91_PIO_TD1
314 | AT91_PIO_RD1 /* | AT91_PIO_RK1 */ | AT91_PIO_RF1;
315
316 /* Reset all PIO registers and assign lines to peripheral A */
317 at91_sys_write(AT91_PIOB + PIO_PDR, ssc_pio_lines);
318 at91_sys_write(AT91_PIOB + PIO_ODR, ssc_pio_lines);
319 at91_sys_write(AT91_PIOB + PIO_IFDR, ssc_pio_lines);
320 at91_sys_write(AT91_PIOB + PIO_CODR, ssc_pio_lines);
321 at91_sys_write(AT91_PIOB + PIO_IDR, ssc_pio_lines);
322 at91_sys_write(AT91_PIOB + PIO_MDDR, ssc_pio_lines);
323 at91_sys_write(AT91_PIOB + PIO_PUDR, ssc_pio_lines);
324 at91_sys_write(AT91_PIOB + PIO_ASR, ssc_pio_lines);
325 at91_sys_write(AT91_PIOB + PIO_OWDR, ssc_pio_lines);
326
327 /*
328 * Set PCK1 parent to PLLB and its rate to 12 Mhz.
329 */
330 pllb_clk = clk_get(NULL, "pllb");
331 pck1_clk = clk_get(NULL, "pck1");
332
333 clk_set_parent(pck1_clk, pllb_clk);
334 clk_set_rate(pck1_clk, 12000000);
335
336 DBG("MCLK rate %luHz\n", clk_get_rate(pck1_clk));
337
338 /* assign the GPIO pin to PCK1 */
339 at91_set_B_periph(AT91_PIN_PA24, 0);
340
341 #ifdef CONFIG_SND_AT91_SOC_ETI_SLAVE
342 printk(KERN_INFO "eti_b1_wm8731: Codec in Slave Mode\n");
343 #else
344 printk(KERN_INFO "eti_b1_wm8731: Codec in Master Mode\n");
345 #endif
346 return ret;
347
348 fail_io_unmap:
349 iounmap(ssc->base);
350 fail_release_mem:
351 release_mem_region(AT91RM9200_BASE_SSC1, SZ_16K);
352 return ret;
353 }
354
355 static void __exit eti_b1_exit(void)
356 {
357 struct at91_ssc_periph *ssc = eti_b1_dai.cpu_dai->private_data;
358
359 clk_put(pck1_clk);
360 clk_put(pllb_clk);
361
362 platform_device_unregister(eti_b1_snd_device);
363
364 iounmap(ssc->base);
365 release_mem_region(AT91RM9200_BASE_SSC1, SZ_16K);
366 }
367
368 module_init(eti_b1_init);
369 module_exit(eti_b1_exit);
370
371 /* Module information */
372 MODULE_AUTHOR("Frank Mandarino <fmandarino@endrelia.com>");
373 MODULE_DESCRIPTION("ALSA SoC ETI-B1-WM8731");
374 MODULE_LICENSE("GPL");
375
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