Merge branch 'topic/asoc' into for-linus
[linux-2.6] / sound / soc / fsl / mpc5200_psc_ac97.c
1 /*
2  * linux/sound/mpc5200-ac97.c -- AC97 support for the Freescale MPC52xx chip.
3  *
4  * Copyright (C) 2009 Jon Smirl, Digispeaker
5  * Author: Jon Smirl <jonsmirl@gmail.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/module.h>
13 #include <linux/of_device.h>
14 #include <linux/of_platform.h>
15
16 #include <sound/pcm.h>
17 #include <sound/pcm_params.h>
18 #include <sound/soc.h>
19
20 #include <asm/time.h>
21 #include <asm/delay.h>
22 #include <asm/mpc52xx_psc.h>
23
24 #include "mpc5200_dma.h"
25 #include "mpc5200_psc_ac97.h"
26
27 #define DRV_NAME "mpc5200-psc-ac97"
28
29 /* ALSA only supports a single AC97 device so static is recommend here */
30 static struct psc_dma *psc_dma;
31
32 static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
33 {
34         int status;
35         unsigned int val;
36
37         /* Wait for command send status zero = ready */
38         status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
39                                 MPC52xx_PSC_SR_CMDSEND), 100, 0);
40         if (status == 0) {
41                 pr_err("timeout on ac97 bus (rdy)\n");
42                 return -ENODEV;
43         }
44         /* Send the read */
45         out_be32(&psc_dma->psc_regs->ac97_cmd, (1<<31) | ((reg & 0x7f) << 24));
46
47         /* Wait for the answer */
48         status = spin_event_timeout((in_be16(&psc_dma->psc_regs->sr_csr.status) &
49                                 MPC52xx_PSC_SR_DATA_VAL), 100, 0);
50         if (status == 0) {
51                 pr_err("timeout on ac97 read (val) %x\n",
52                                 in_be16(&psc_dma->psc_regs->sr_csr.status));
53                 return -ENODEV;
54         }
55         /* Get the data */
56         val = in_be32(&psc_dma->psc_regs->ac97_data);
57         if (((val >> 24) & 0x7f) != reg) {
58                 pr_err("reg echo error on ac97 read\n");
59                 return -ENODEV;
60         }
61         val = (val >> 8) & 0xffff;
62
63         return (unsigned short) val;
64 }
65
66 static void psc_ac97_write(struct snd_ac97 *ac97,
67                                 unsigned short reg, unsigned short val)
68 {
69         int status;
70
71         /* Wait for command status zero = ready */
72         status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
73                                 MPC52xx_PSC_SR_CMDSEND), 100, 0);
74         if (status == 0) {
75                 pr_err("timeout on ac97 bus (write)\n");
76                 return;
77         }
78         /* Write data */
79         out_be32(&psc_dma->psc_regs->ac97_cmd,
80                         ((reg & 0x7f) << 24) | (val << 8));
81 }
82
83 static void psc_ac97_warm_reset(struct snd_ac97 *ac97)
84 {
85         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
86
87         out_be32(&regs->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_AWR);
88         udelay(3);
89         out_be32(&regs->sicr, psc_dma->sicr);
90 }
91
92 static void psc_ac97_cold_reset(struct snd_ac97 *ac97)
93 {
94         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
95
96         /* Do a cold reset */
97         out_8(&regs->op1, MPC52xx_PSC_OP_RES);
98         udelay(10);
99         out_8(&regs->op0, MPC52xx_PSC_OP_RES);
100         udelay(50);
101         psc_ac97_warm_reset(ac97);
102 }
103
104 struct snd_ac97_bus_ops soc_ac97_ops = {
105         .read           = psc_ac97_read,
106         .write          = psc_ac97_write,
107         .reset          = psc_ac97_cold_reset,
108         .warm_reset     = psc_ac97_warm_reset,
109 };
110 EXPORT_SYMBOL_GPL(soc_ac97_ops);
111
112 static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream,
113                                  struct snd_pcm_hw_params *params,
114                                  struct snd_soc_dai *cpu_dai)
115 {
116         struct psc_dma *psc_dma = cpu_dai->private_data;
117
118         dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
119                 " periods=%i buffer_size=%i  buffer_bytes=%i channels=%i"
120                 " rate=%i format=%i\n",
121                 __func__, substream, params_period_size(params),
122                 params_period_bytes(params), params_periods(params),
123                 params_buffer_size(params), params_buffer_bytes(params),
124                 params_channels(params), params_rate(params),
125                 params_format(params));
126
127
128         if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
129                 if (params_channels(params) == 1)
130                         psc_dma->slots |= 0x00000100;
131                 else
132                         psc_dma->slots |= 0x00000300;
133         } else {
134                 if (params_channels(params) == 1)
135                         psc_dma->slots |= 0x01000000;
136                 else
137                         psc_dma->slots |= 0x03000000;
138         }
139         out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
140
141         return 0;
142 }
143
144 static int psc_ac97_hw_digital_params(struct snd_pcm_substream *substream,
145                                  struct snd_pcm_hw_params *params,
146                                  struct snd_soc_dai *cpu_dai)
147 {
148         struct psc_dma *psc_dma = cpu_dai->private_data;
149
150         if (params_channels(params) == 1)
151                 out_be32(&psc_dma->psc_regs->ac97_slots, 0x01000000);
152         else
153                 out_be32(&psc_dma->psc_regs->ac97_slots, 0x03000000);
154
155         return 0;
156 }
157
158 static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
159                                                         struct snd_soc_dai *dai)
160 {
161         struct snd_soc_pcm_runtime *rtd = substream->private_data;
162         struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
163
164         switch (cmd) {
165         case SNDRV_PCM_TRIGGER_STOP:
166                 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
167                         psc_dma->slots &= 0xFFFF0000;
168                 else
169                         psc_dma->slots &= 0x0000FFFF;
170
171                 out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
172                 break;
173         }
174         return 0;
175 }
176
177 static int psc_ac97_probe(struct platform_device *pdev,
178                                         struct snd_soc_dai *cpu_dai)
179 {
180         struct psc_dma *psc_dma = cpu_dai->private_data;
181         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
182
183         /* Go */
184         out_8(&regs->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
185         return 0;
186 }
187
188 /* ---------------------------------------------------------------------
189  * ALSA SoC Bindings
190  *
191  * - Digital Audio Interface (DAI) template
192  * - create/destroy dai hooks
193  */
194
195 /**
196  * psc_ac97_dai_template: template CPU Digital Audio Interface
197  */
198 static struct snd_soc_dai_ops psc_ac97_analog_ops = {
199         .hw_params      = psc_ac97_hw_analog_params,
200         .trigger        = psc_ac97_trigger,
201 };
202
203 static struct snd_soc_dai_ops psc_ac97_digital_ops = {
204         .hw_params      = psc_ac97_hw_digital_params,
205 };
206
207 struct snd_soc_dai psc_ac97_dai[] = {
208 {
209         .name   = "AC97",
210         .ac97_control = 1,
211         .probe  = psc_ac97_probe,
212         .playback = {
213                 .channels_min   = 1,
214                 .channels_max   = 6,
215                 .rates          = SNDRV_PCM_RATE_8000_48000,
216                 .formats = SNDRV_PCM_FMTBIT_S32_BE,
217         },
218         .capture = {
219                 .channels_min   = 1,
220                 .channels_max   = 2,
221                 .rates          = SNDRV_PCM_RATE_8000_48000,
222                 .formats = SNDRV_PCM_FMTBIT_S32_BE,
223         },
224         .ops = &psc_ac97_analog_ops,
225 },
226 {
227         .name   = "SPDIF",
228         .ac97_control = 1,
229         .playback = {
230                 .channels_min   = 1,
231                 .channels_max   = 2,
232                 .rates          = SNDRV_PCM_RATE_32000 | \
233                         SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
234                 .formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE,
235         },
236         .ops = &psc_ac97_digital_ops,
237 } };
238 EXPORT_SYMBOL_GPL(psc_ac97_dai);
239
240
241
242 /* ---------------------------------------------------------------------
243  * OF platform bus binding code:
244  * - Probe/remove operations
245  * - OF device match table
246  */
247 static int __devinit psc_ac97_of_probe(struct of_device *op,
248                                       const struct of_device_id *match)
249 {
250         int rc, i;
251         struct snd_ac97 ac97;
252         struct mpc52xx_psc __iomem *regs;
253
254         rc = mpc5200_audio_dma_create(op);
255         if (rc != 0)
256                 return rc;
257
258         for (i = 0; i < ARRAY_SIZE(psc_ac97_dai); i++)
259                 psc_ac97_dai[i].dev = &op->dev;
260
261         rc = snd_soc_register_dais(psc_ac97_dai, ARRAY_SIZE(psc_ac97_dai));
262         if (rc != 0) {
263                 dev_err(&op->dev, "Failed to register DAI\n");
264                 return rc;
265         }
266
267         psc_dma = dev_get_drvdata(&op->dev);
268         regs = psc_dma->psc_regs;
269         ac97.private_data = psc_dma;
270
271         for (i = 0; i < ARRAY_SIZE(psc_ac97_dai); i++)
272                 psc_ac97_dai[i].private_data = psc_dma;
273
274         psc_dma->imr = 0;
275         out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
276
277         /* Configure the serial interface mode to AC97 */
278         psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 | MPC52xx_PSC_SICR_ENAC97;
279         out_be32(&regs->sicr, psc_dma->sicr);
280
281         /* No slots active */
282         out_be32(&regs->ac97_slots, 0x00000000);
283
284         return 0;
285 }
286
287 static int __devexit psc_ac97_of_remove(struct of_device *op)
288 {
289         return mpc5200_audio_dma_destroy(op);
290 }
291
292 /* Match table for of_platform binding */
293 static struct of_device_id psc_ac97_match[] __devinitdata = {
294         { .compatible = "fsl,mpc5200-psc-ac97", },
295         { .compatible = "fsl,mpc5200b-psc-ac97", },
296         {}
297 };
298 MODULE_DEVICE_TABLE(of, psc_ac97_match);
299
300 static struct of_platform_driver psc_ac97_driver = {
301         .match_table = psc_ac97_match,
302         .probe = psc_ac97_of_probe,
303         .remove = __devexit_p(psc_ac97_of_remove),
304         .driver = {
305                 .name = "mpc5200-psc-ac97",
306                 .owner = THIS_MODULE,
307         },
308 };
309
310 /* ---------------------------------------------------------------------
311  * Module setup and teardown; simply register the of_platform driver
312  * for the PSC in AC97 mode.
313  */
314 static int __init psc_ac97_init(void)
315 {
316         return of_register_platform_driver(&psc_ac97_driver);
317 }
318 module_init(psc_ac97_init);
319
320 static void __exit psc_ac97_exit(void)
321 {
322         of_unregister_platform_driver(&psc_ac97_driver);
323 }
324 module_exit(psc_ac97_exit);
325
326 MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>");
327 MODULE_DESCRIPTION("mpc5200 AC97 module");
328 MODULE_LICENSE("GPL");
329