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20d0e152 JS |
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> | |
ed0f19b2 | 15 | #include <linux/delay.h> |
20d0e152 JS |
16 | |
17 | #include <sound/pcm.h> | |
18 | #include <sound/pcm_params.h> | |
19 | #include <sound/soc.h> | |
20 | ||
21 | #include <asm/time.h> | |
22 | #include <asm/delay.h> | |
23 | #include <asm/mpc52xx_psc.h> | |
24 | ||
25 | #include "mpc5200_dma.h" | |
26 | #include "mpc5200_psc_ac97.h" | |
27 | ||
28 | #define DRV_NAME "mpc5200-psc-ac97" | |
29 | ||
30 | /* ALSA only supports a single AC97 device so static is recommend here */ | |
31 | static struct psc_dma *psc_dma; | |
32 | ||
33 | static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg) | |
34 | { | |
ea8b27ad | 35 | int status; |
20d0e152 JS |
36 | unsigned int val; |
37 | ||
0827d6ba GL |
38 | mutex_lock(&psc_dma->mutex); |
39 | ||
20d0e152 | 40 | /* Wait for command send status zero = ready */ |
ea8b27ad JS |
41 | status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) & |
42 | MPC52xx_PSC_SR_CMDSEND), 100, 0); | |
43 | if (status == 0) { | |
20d0e152 | 44 | pr_err("timeout on ac97 bus (rdy)\n"); |
0827d6ba | 45 | mutex_unlock(&psc_dma->mutex); |
20d0e152 JS |
46 | return -ENODEV; |
47 | } | |
07573534 GL |
48 | |
49 | /* Force clear the data valid bit */ | |
50 | in_be32(&psc_dma->psc_regs->ac97_data); | |
51 | ||
20d0e152 JS |
52 | /* Send the read */ |
53 | out_be32(&psc_dma->psc_regs->ac97_cmd, (1<<31) | ((reg & 0x7f) << 24)); | |
54 | ||
55 | /* Wait for the answer */ | |
ea8b27ad JS |
56 | status = spin_event_timeout((in_be16(&psc_dma->psc_regs->sr_csr.status) & |
57 | MPC52xx_PSC_SR_DATA_VAL), 100, 0); | |
58 | if (status == 0) { | |
20d0e152 JS |
59 | pr_err("timeout on ac97 read (val) %x\n", |
60 | in_be16(&psc_dma->psc_regs->sr_csr.status)); | |
0827d6ba | 61 | mutex_unlock(&psc_dma->mutex); |
20d0e152 JS |
62 | return -ENODEV; |
63 | } | |
64 | /* Get the data */ | |
65 | val = in_be32(&psc_dma->psc_regs->ac97_data); | |
66 | if (((val >> 24) & 0x7f) != reg) { | |
67 | pr_err("reg echo error on ac97 read\n"); | |
0827d6ba | 68 | mutex_unlock(&psc_dma->mutex); |
20d0e152 JS |
69 | return -ENODEV; |
70 | } | |
71 | val = (val >> 8) & 0xffff; | |
72 | ||
0827d6ba | 73 | mutex_unlock(&psc_dma->mutex); |
20d0e152 JS |
74 | return (unsigned short) val; |
75 | } | |
76 | ||
77 | static void psc_ac97_write(struct snd_ac97 *ac97, | |
78 | unsigned short reg, unsigned short val) | |
79 | { | |
ea8b27ad | 80 | int status; |
20d0e152 | 81 | |
0827d6ba GL |
82 | mutex_lock(&psc_dma->mutex); |
83 | ||
20d0e152 | 84 | /* Wait for command status zero = ready */ |
ea8b27ad JS |
85 | status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) & |
86 | MPC52xx_PSC_SR_CMDSEND), 100, 0); | |
87 | if (status == 0) { | |
20d0e152 | 88 | pr_err("timeout on ac97 bus (write)\n"); |
0827d6ba | 89 | goto out; |
20d0e152 JS |
90 | } |
91 | /* Write data */ | |
92 | out_be32(&psc_dma->psc_regs->ac97_cmd, | |
93 | ((reg & 0x7f) << 24) | (val << 8)); | |
0827d6ba GL |
94 | |
95 | out: | |
96 | mutex_unlock(&psc_dma->mutex); | |
20d0e152 JS |
97 | } |
98 | ||
99 | static void psc_ac97_warm_reset(struct snd_ac97 *ac97) | |
100 | { | |
20d0e152 JS |
101 | struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; |
102 | ||
103 | out_be32(®s->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_AWR); | |
ea8b27ad | 104 | udelay(3); |
20d0e152 JS |
105 | out_be32(®s->sicr, psc_dma->sicr); |
106 | } | |
107 | ||
108 | static void psc_ac97_cold_reset(struct snd_ac97 *ac97) | |
109 | { | |
20d0e152 JS |
110 | struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; |
111 | ||
112 | /* Do a cold reset */ | |
113 | out_8(®s->op1, MPC52xx_PSC_OP_RES); | |
ea8b27ad | 114 | udelay(10); |
20d0e152 | 115 | out_8(®s->op0, MPC52xx_PSC_OP_RES); |
ed0f19b2 | 116 | msleep(1); |
20d0e152 JS |
117 | psc_ac97_warm_reset(ac97); |
118 | } | |
119 | ||
120 | struct snd_ac97_bus_ops soc_ac97_ops = { | |
121 | .read = psc_ac97_read, | |
122 | .write = psc_ac97_write, | |
123 | .reset = psc_ac97_cold_reset, | |
124 | .warm_reset = psc_ac97_warm_reset, | |
125 | }; | |
126 | EXPORT_SYMBOL_GPL(soc_ac97_ops); | |
127 | ||
128 | static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream, | |
129 | struct snd_pcm_hw_params *params, | |
130 | struct snd_soc_dai *cpu_dai) | |
131 | { | |
132 | struct psc_dma *psc_dma = cpu_dai->private_data; | |
c939e5c8 | 133 | struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma); |
20d0e152 JS |
134 | |
135 | dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i" | |
136 | " periods=%i buffer_size=%i buffer_bytes=%i channels=%i" | |
137 | " rate=%i format=%i\n", | |
138 | __func__, substream, params_period_size(params), | |
139 | params_period_bytes(params), params_periods(params), | |
140 | params_buffer_size(params), params_buffer_bytes(params), | |
141 | params_channels(params), params_rate(params), | |
142 | params_format(params)); | |
143 | ||
c939e5c8 GL |
144 | /* Determine the set of enable bits to turn on */ |
145 | s->ac97_slot_bits = (params_channels(params) == 1) ? 0x100 : 0x300; | |
146 | if (substream->pstr->stream != SNDRV_PCM_STREAM_CAPTURE) | |
147 | s->ac97_slot_bits <<= 16; | |
20d0e152 JS |
148 | return 0; |
149 | } | |
150 | ||
151 | static int psc_ac97_hw_digital_params(struct snd_pcm_substream *substream, | |
152 | struct snd_pcm_hw_params *params, | |
153 | struct snd_soc_dai *cpu_dai) | |
154 | { | |
155 | struct psc_dma *psc_dma = cpu_dai->private_data; | |
156 | ||
c939e5c8 GL |
157 | dev_dbg(psc_dma->dev, "%s(substream=%p)\n", __func__, substream); |
158 | ||
20d0e152 JS |
159 | if (params_channels(params) == 1) |
160 | out_be32(&psc_dma->psc_regs->ac97_slots, 0x01000000); | |
161 | else | |
162 | out_be32(&psc_dma->psc_regs->ac97_slots, 0x03000000); | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd, | |
168 | struct snd_soc_dai *dai) | |
169 | { | |
170 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
171 | struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data; | |
c939e5c8 | 172 | struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma); |
20d0e152 JS |
173 | |
174 | switch (cmd) { | |
c939e5c8 GL |
175 | case SNDRV_PCM_TRIGGER_START: |
176 | dev_dbg(psc_dma->dev, "AC97 START: stream=%i\n", | |
177 | substream->pstr->stream); | |
178 | ||
179 | /* Set the slot enable bits */ | |
180 | psc_dma->slots |= s->ac97_slot_bits; | |
181 | out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots); | |
182 | break; | |
183 | ||
20d0e152 | 184 | case SNDRV_PCM_TRIGGER_STOP: |
c939e5c8 GL |
185 | dev_dbg(psc_dma->dev, "AC97 STOP: stream=%i\n", |
186 | substream->pstr->stream); | |
20d0e152 | 187 | |
c939e5c8 GL |
188 | /* Clear the slot enable bits */ |
189 | psc_dma->slots &= ~(s->ac97_slot_bits); | |
20d0e152 JS |
190 | out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots); |
191 | break; | |
192 | } | |
193 | return 0; | |
194 | } | |
195 | ||
196 | static int psc_ac97_probe(struct platform_device *pdev, | |
197 | struct snd_soc_dai *cpu_dai) | |
198 | { | |
199 | struct psc_dma *psc_dma = cpu_dai->private_data; | |
200 | struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; | |
201 | ||
202 | /* Go */ | |
203 | out_8(®s->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); | |
204 | return 0; | |
205 | } | |
206 | ||
207 | /* --------------------------------------------------------------------- | |
208 | * ALSA SoC Bindings | |
209 | * | |
210 | * - Digital Audio Interface (DAI) template | |
211 | * - create/destroy dai hooks | |
212 | */ | |
213 | ||
214 | /** | |
215 | * psc_ac97_dai_template: template CPU Digital Audio Interface | |
216 | */ | |
217 | static struct snd_soc_dai_ops psc_ac97_analog_ops = { | |
218 | .hw_params = psc_ac97_hw_analog_params, | |
219 | .trigger = psc_ac97_trigger, | |
220 | }; | |
221 | ||
222 | static struct snd_soc_dai_ops psc_ac97_digital_ops = { | |
223 | .hw_params = psc_ac97_hw_digital_params, | |
224 | }; | |
225 | ||
226 | struct snd_soc_dai psc_ac97_dai[] = { | |
227 | { | |
228 | .name = "AC97", | |
229 | .ac97_control = 1, | |
230 | .probe = psc_ac97_probe, | |
231 | .playback = { | |
232 | .channels_min = 1, | |
233 | .channels_max = 6, | |
234 | .rates = SNDRV_PCM_RATE_8000_48000, | |
235 | .formats = SNDRV_PCM_FMTBIT_S32_BE, | |
236 | }, | |
237 | .capture = { | |
238 | .channels_min = 1, | |
239 | .channels_max = 2, | |
240 | .rates = SNDRV_PCM_RATE_8000_48000, | |
241 | .formats = SNDRV_PCM_FMTBIT_S32_BE, | |
242 | }, | |
243 | .ops = &psc_ac97_analog_ops, | |
244 | }, | |
245 | { | |
246 | .name = "SPDIF", | |
247 | .ac97_control = 1, | |
248 | .playback = { | |
249 | .channels_min = 1, | |
250 | .channels_max = 2, | |
251 | .rates = SNDRV_PCM_RATE_32000 | \ | |
252 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000, | |
253 | .formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE, | |
254 | }, | |
255 | .ops = &psc_ac97_digital_ops, | |
256 | } }; | |
257 | EXPORT_SYMBOL_GPL(psc_ac97_dai); | |
258 | ||
259 | ||
260 | ||
261 | /* --------------------------------------------------------------------- | |
262 | * OF platform bus binding code: | |
263 | * - Probe/remove operations | |
264 | * - OF device match table | |
265 | */ | |
266 | static int __devinit psc_ac97_of_probe(struct of_device *op, | |
267 | const struct of_device_id *match) | |
268 | { | |
269 | int rc, i; | |
270 | struct snd_ac97 ac97; | |
271 | struct mpc52xx_psc __iomem *regs; | |
272 | ||
273 | rc = mpc5200_audio_dma_create(op); | |
274 | if (rc != 0) | |
275 | return rc; | |
276 | ||
277 | for (i = 0; i < ARRAY_SIZE(psc_ac97_dai); i++) | |
278 | psc_ac97_dai[i].dev = &op->dev; | |
279 | ||
280 | rc = snd_soc_register_dais(psc_ac97_dai, ARRAY_SIZE(psc_ac97_dai)); | |
281 | if (rc != 0) { | |
282 | dev_err(&op->dev, "Failed to register DAI\n"); | |
283 | return rc; | |
284 | } | |
285 | ||
286 | psc_dma = dev_get_drvdata(&op->dev); | |
287 | regs = psc_dma->psc_regs; | |
288 | ac97.private_data = psc_dma; | |
289 | ||
290 | for (i = 0; i < ARRAY_SIZE(psc_ac97_dai); i++) | |
291 | psc_ac97_dai[i].private_data = psc_dma; | |
292 | ||
293 | psc_dma->imr = 0; | |
294 | out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr); | |
295 | ||
296 | /* Configure the serial interface mode to AC97 */ | |
297 | psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 | MPC52xx_PSC_SICR_ENAC97; | |
298 | out_be32(®s->sicr, psc_dma->sicr); | |
299 | ||
300 | /* No slots active */ | |
301 | out_be32(®s->ac97_slots, 0x00000000); | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | static int __devexit psc_ac97_of_remove(struct of_device *op) | |
307 | { | |
308 | return mpc5200_audio_dma_destroy(op); | |
309 | } | |
310 | ||
311 | /* Match table for of_platform binding */ | |
312 | static struct of_device_id psc_ac97_match[] __devinitdata = { | |
313 | { .compatible = "fsl,mpc5200-psc-ac97", }, | |
314 | { .compatible = "fsl,mpc5200b-psc-ac97", }, | |
315 | {} | |
316 | }; | |
317 | MODULE_DEVICE_TABLE(of, psc_ac97_match); | |
318 | ||
319 | static struct of_platform_driver psc_ac97_driver = { | |
20d0e152 JS |
320 | .probe = psc_ac97_of_probe, |
321 | .remove = __devexit_p(psc_ac97_of_remove), | |
322 | .driver = { | |
323 | .name = "mpc5200-psc-ac97", | |
324 | .owner = THIS_MODULE, | |
4018294b | 325 | .of_match_table = psc_ac97_match, |
20d0e152 JS |
326 | }, |
327 | }; | |
328 | ||
329 | /* --------------------------------------------------------------------- | |
330 | * Module setup and teardown; simply register the of_platform driver | |
331 | * for the PSC in AC97 mode. | |
332 | */ | |
333 | static int __init psc_ac97_init(void) | |
334 | { | |
335 | return of_register_platform_driver(&psc_ac97_driver); | |
336 | } | |
337 | module_init(psc_ac97_init); | |
338 | ||
339 | static void __exit psc_ac97_exit(void) | |
340 | { | |
341 | of_unregister_platform_driver(&psc_ac97_driver); | |
342 | } | |
343 | module_exit(psc_ac97_exit); | |
344 | ||
345 | MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>"); | |
346 | MODULE_DESCRIPTION("mpc5200 AC97 module"); | |
347 | MODULE_LICENSE("GPL"); | |
348 |