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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> | |
949ad0a7 | 23 | #include <asm/mpc52xx.h> |
20d0e152 JS |
24 | #include <asm/mpc52xx_psc.h> |
25 | ||
26 | #include "mpc5200_dma.h" | |
27 | #include "mpc5200_psc_ac97.h" | |
28 | ||
29 | #define DRV_NAME "mpc5200-psc-ac97" | |
30 | ||
31 | /* ALSA only supports a single AC97 device so static is recommend here */ | |
32 | static struct psc_dma *psc_dma; | |
33 | ||
34 | static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg) | |
35 | { | |
ea8b27ad | 36 | int status; |
20d0e152 JS |
37 | unsigned int val; |
38 | ||
0827d6ba GL |
39 | mutex_lock(&psc_dma->mutex); |
40 | ||
20d0e152 | 41 | /* Wait for command send status zero = ready */ |
ea8b27ad JS |
42 | status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) & |
43 | MPC52xx_PSC_SR_CMDSEND), 100, 0); | |
44 | if (status == 0) { | |
20d0e152 | 45 | pr_err("timeout on ac97 bus (rdy)\n"); |
0827d6ba | 46 | mutex_unlock(&psc_dma->mutex); |
20d0e152 JS |
47 | return -ENODEV; |
48 | } | |
07573534 GL |
49 | |
50 | /* Force clear the data valid bit */ | |
51 | in_be32(&psc_dma->psc_regs->ac97_data); | |
52 | ||
20d0e152 JS |
53 | /* Send the read */ |
54 | out_be32(&psc_dma->psc_regs->ac97_cmd, (1<<31) | ((reg & 0x7f) << 24)); | |
55 | ||
56 | /* Wait for the answer */ | |
ea8b27ad JS |
57 | status = spin_event_timeout((in_be16(&psc_dma->psc_regs->sr_csr.status) & |
58 | MPC52xx_PSC_SR_DATA_VAL), 100, 0); | |
59 | if (status == 0) { | |
20d0e152 JS |
60 | pr_err("timeout on ac97 read (val) %x\n", |
61 | in_be16(&psc_dma->psc_regs->sr_csr.status)); | |
0827d6ba | 62 | mutex_unlock(&psc_dma->mutex); |
20d0e152 JS |
63 | return -ENODEV; |
64 | } | |
65 | /* Get the data */ | |
66 | val = in_be32(&psc_dma->psc_regs->ac97_data); | |
67 | if (((val >> 24) & 0x7f) != reg) { | |
68 | pr_err("reg echo error on ac97 read\n"); | |
0827d6ba | 69 | mutex_unlock(&psc_dma->mutex); |
20d0e152 JS |
70 | return -ENODEV; |
71 | } | |
72 | val = (val >> 8) & 0xffff; | |
73 | ||
0827d6ba | 74 | mutex_unlock(&psc_dma->mutex); |
20d0e152 JS |
75 | return (unsigned short) val; |
76 | } | |
77 | ||
78 | static void psc_ac97_write(struct snd_ac97 *ac97, | |
79 | unsigned short reg, unsigned short val) | |
80 | { | |
ea8b27ad | 81 | int status; |
20d0e152 | 82 | |
0827d6ba GL |
83 | mutex_lock(&psc_dma->mutex); |
84 | ||
20d0e152 | 85 | /* Wait for command status zero = ready */ |
ea8b27ad JS |
86 | status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) & |
87 | MPC52xx_PSC_SR_CMDSEND), 100, 0); | |
88 | if (status == 0) { | |
20d0e152 | 89 | pr_err("timeout on ac97 bus (write)\n"); |
0827d6ba | 90 | goto out; |
20d0e152 JS |
91 | } |
92 | /* Write data */ | |
93 | out_be32(&psc_dma->psc_regs->ac97_cmd, | |
94 | ((reg & 0x7f) << 24) | (val << 8)); | |
0827d6ba GL |
95 | |
96 | out: | |
97 | mutex_unlock(&psc_dma->mutex); | |
20d0e152 JS |
98 | } |
99 | ||
100 | static void psc_ac97_warm_reset(struct snd_ac97 *ac97) | |
101 | { | |
20d0e152 JS |
102 | struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; |
103 | ||
949ad0a7 EM |
104 | mutex_lock(&psc_dma->mutex); |
105 | ||
20d0e152 | 106 | out_be32(®s->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_AWR); |
ea8b27ad | 107 | udelay(3); |
20d0e152 | 108 | out_be32(®s->sicr, psc_dma->sicr); |
949ad0a7 EM |
109 | |
110 | mutex_unlock(&psc_dma->mutex); | |
20d0e152 JS |
111 | } |
112 | ||
113 | static void psc_ac97_cold_reset(struct snd_ac97 *ac97) | |
114 | { | |
20d0e152 JS |
115 | struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; |
116 | ||
949ad0a7 EM |
117 | mutex_lock(&psc_dma->mutex); |
118 | dev_dbg(psc_dma->dev, "cold reset\n"); | |
119 | ||
120 | mpc5200_psc_ac97_gpio_reset(psc_dma->id); | |
121 | ||
122 | /* Notify the PSC that a reset has occurred */ | |
123 | out_be32(®s->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_ACRB); | |
124 | ||
125 | /* Re-enable RX and TX */ | |
126 | out_8(®s->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); | |
127 | ||
128 | mutex_unlock(&psc_dma->mutex); | |
129 | ||
ed0f19b2 | 130 | msleep(1); |
20d0e152 JS |
131 | psc_ac97_warm_reset(ac97); |
132 | } | |
133 | ||
134 | struct snd_ac97_bus_ops soc_ac97_ops = { | |
135 | .read = psc_ac97_read, | |
136 | .write = psc_ac97_write, | |
137 | .reset = psc_ac97_cold_reset, | |
138 | .warm_reset = psc_ac97_warm_reset, | |
139 | }; | |
140 | EXPORT_SYMBOL_GPL(soc_ac97_ops); | |
141 | ||
142 | static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream, | |
143 | struct snd_pcm_hw_params *params, | |
144 | struct snd_soc_dai *cpu_dai) | |
145 | { | |
f0fba2ad | 146 | struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); |
c939e5c8 | 147 | struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma); |
20d0e152 JS |
148 | |
149 | dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i" | |
150 | " periods=%i buffer_size=%i buffer_bytes=%i channels=%i" | |
151 | " rate=%i format=%i\n", | |
152 | __func__, substream, params_period_size(params), | |
153 | params_period_bytes(params), params_periods(params), | |
154 | params_buffer_size(params), params_buffer_bytes(params), | |
155 | params_channels(params), params_rate(params), | |
156 | params_format(params)); | |
157 | ||
c939e5c8 GL |
158 | /* Determine the set of enable bits to turn on */ |
159 | s->ac97_slot_bits = (params_channels(params) == 1) ? 0x100 : 0x300; | |
160 | if (substream->pstr->stream != SNDRV_PCM_STREAM_CAPTURE) | |
161 | s->ac97_slot_bits <<= 16; | |
20d0e152 JS |
162 | return 0; |
163 | } | |
164 | ||
165 | static int psc_ac97_hw_digital_params(struct snd_pcm_substream *substream, | |
166 | struct snd_pcm_hw_params *params, | |
167 | struct snd_soc_dai *cpu_dai) | |
168 | { | |
f0fba2ad | 169 | struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); |
20d0e152 | 170 | |
c939e5c8 GL |
171 | dev_dbg(psc_dma->dev, "%s(substream=%p)\n", __func__, substream); |
172 | ||
20d0e152 JS |
173 | if (params_channels(params) == 1) |
174 | out_be32(&psc_dma->psc_regs->ac97_slots, 0x01000000); | |
175 | else | |
176 | out_be32(&psc_dma->psc_regs->ac97_slots, 0x03000000); | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd, | |
182 | struct snd_soc_dai *dai) | |
183 | { | |
f0fba2ad | 184 | struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(dai); |
c939e5c8 | 185 | struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma); |
20d0e152 JS |
186 | |
187 | switch (cmd) { | |
c939e5c8 GL |
188 | case SNDRV_PCM_TRIGGER_START: |
189 | dev_dbg(psc_dma->dev, "AC97 START: stream=%i\n", | |
190 | substream->pstr->stream); | |
191 | ||
192 | /* Set the slot enable bits */ | |
193 | psc_dma->slots |= s->ac97_slot_bits; | |
194 | out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots); | |
195 | break; | |
196 | ||
20d0e152 | 197 | case SNDRV_PCM_TRIGGER_STOP: |
c939e5c8 GL |
198 | dev_dbg(psc_dma->dev, "AC97 STOP: stream=%i\n", |
199 | substream->pstr->stream); | |
20d0e152 | 200 | |
c939e5c8 GL |
201 | /* Clear the slot enable bits */ |
202 | psc_dma->slots &= ~(s->ac97_slot_bits); | |
20d0e152 JS |
203 | out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots); |
204 | break; | |
205 | } | |
206 | return 0; | |
207 | } | |
208 | ||
f0fba2ad | 209 | static int psc_ac97_probe(struct snd_soc_dai *cpu_dai) |
20d0e152 | 210 | { |
f0fba2ad | 211 | struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); |
20d0e152 JS |
212 | struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; |
213 | ||
214 | /* Go */ | |
215 | out_8(®s->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); | |
216 | return 0; | |
217 | } | |
218 | ||
219 | /* --------------------------------------------------------------------- | |
220 | * ALSA SoC Bindings | |
221 | * | |
222 | * - Digital Audio Interface (DAI) template | |
223 | * - create/destroy dai hooks | |
224 | */ | |
225 | ||
226 | /** | |
227 | * psc_ac97_dai_template: template CPU Digital Audio Interface | |
228 | */ | |
229 | static struct snd_soc_dai_ops psc_ac97_analog_ops = { | |
230 | .hw_params = psc_ac97_hw_analog_params, | |
231 | .trigger = psc_ac97_trigger, | |
232 | }; | |
233 | ||
234 | static struct snd_soc_dai_ops psc_ac97_digital_ops = { | |
235 | .hw_params = psc_ac97_hw_digital_params, | |
236 | }; | |
237 | ||
f0fba2ad | 238 | static struct snd_soc_dai_driver psc_ac97_dai[] = { |
20d0e152 | 239 | { |
20d0e152 JS |
240 | .ac97_control = 1, |
241 | .probe = psc_ac97_probe, | |
242 | .playback = { | |
243 | .channels_min = 1, | |
244 | .channels_max = 6, | |
245 | .rates = SNDRV_PCM_RATE_8000_48000, | |
246 | .formats = SNDRV_PCM_FMTBIT_S32_BE, | |
247 | }, | |
248 | .capture = { | |
249 | .channels_min = 1, | |
250 | .channels_max = 2, | |
251 | .rates = SNDRV_PCM_RATE_8000_48000, | |
252 | .formats = SNDRV_PCM_FMTBIT_S32_BE, | |
253 | }, | |
254 | .ops = &psc_ac97_analog_ops, | |
255 | }, | |
256 | { | |
20d0e152 JS |
257 | .ac97_control = 1, |
258 | .playback = { | |
259 | .channels_min = 1, | |
260 | .channels_max = 2, | |
261 | .rates = SNDRV_PCM_RATE_32000 | \ | |
262 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000, | |
263 | .formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE, | |
264 | }, | |
265 | .ops = &psc_ac97_digital_ops, | |
266 | } }; | |
20d0e152 JS |
267 | |
268 | ||
269 | ||
270 | /* --------------------------------------------------------------------- | |
271 | * OF platform bus binding code: | |
272 | * - Probe/remove operations | |
273 | * - OF device match table | |
274 | */ | |
f07eb223 | 275 | static int __devinit psc_ac97_of_probe(struct platform_device *op) |
20d0e152 | 276 | { |
f0fba2ad | 277 | int rc; |
20d0e152 JS |
278 | struct snd_ac97 ac97; |
279 | struct mpc52xx_psc __iomem *regs; | |
280 | ||
f0fba2ad | 281 | rc = snd_soc_register_dais(&op->dev, psc_ac97_dai, ARRAY_SIZE(psc_ac97_dai)); |
20d0e152 JS |
282 | if (rc != 0) { |
283 | dev_err(&op->dev, "Failed to register DAI\n"); | |
284 | return rc; | |
285 | } | |
286 | ||
287 | psc_dma = dev_get_drvdata(&op->dev); | |
288 | regs = psc_dma->psc_regs; | |
289 | ac97.private_data = psc_dma; | |
290 | ||
20d0e152 JS |
291 | psc_dma->imr = 0; |
292 | out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr); | |
293 | ||
294 | /* Configure the serial interface mode to AC97 */ | |
295 | psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 | MPC52xx_PSC_SICR_ENAC97; | |
296 | out_be32(®s->sicr, psc_dma->sicr); | |
297 | ||
298 | /* No slots active */ | |
299 | out_be32(®s->ac97_slots, 0x00000000); | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
2dc11581 | 304 | static int __devexit psc_ac97_of_remove(struct platform_device *op) |
20d0e152 | 305 | { |
f0fba2ad LG |
306 | snd_soc_unregister_dais(&op->dev, ARRAY_SIZE(psc_ac97_dai)); |
307 | return 0; | |
20d0e152 JS |
308 | } |
309 | ||
310 | /* Match table for of_platform binding */ | |
311 | static struct of_device_id psc_ac97_match[] __devinitdata = { | |
312 | { .compatible = "fsl,mpc5200-psc-ac97", }, | |
313 | { .compatible = "fsl,mpc5200b-psc-ac97", }, | |
314 | {} | |
315 | }; | |
316 | MODULE_DEVICE_TABLE(of, psc_ac97_match); | |
317 | ||
f07eb223 | 318 | static struct platform_driver psc_ac97_driver = { |
20d0e152 JS |
319 | .probe = psc_ac97_of_probe, |
320 | .remove = __devexit_p(psc_ac97_of_remove), | |
321 | .driver = { | |
322 | .name = "mpc5200-psc-ac97", | |
323 | .owner = THIS_MODULE, | |
4018294b | 324 | .of_match_table = psc_ac97_match, |
20d0e152 JS |
325 | }, |
326 | }; | |
327 | ||
328 | /* --------------------------------------------------------------------- | |
329 | * Module setup and teardown; simply register the of_platform driver | |
330 | * for the PSC in AC97 mode. | |
331 | */ | |
332 | static int __init psc_ac97_init(void) | |
333 | { | |
f07eb223 | 334 | return platform_driver_register(&psc_ac97_driver); |
20d0e152 JS |
335 | } |
336 | module_init(psc_ac97_init); | |
337 | ||
338 | static void __exit psc_ac97_exit(void) | |
339 | { | |
f07eb223 | 340 | platform_driver_unregister(&psc_ac97_driver); |
20d0e152 JS |
341 | } |
342 | module_exit(psc_ac97_exit); | |
343 | ||
344 | MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>"); | |
345 | MODULE_DESCRIPTION("mpc5200 AC97 module"); | |
346 | MODULE_LICENSE("GPL"); | |
347 |