1// SPDX-License-Identifier: GPL-2.0
2//
3// linux/sound/mpc5200-ac97.c -- AC97 support for the Freescale MPC52xx chip.
4//
5// Copyright (C) 2009 Jon Smirl, Digispeaker
6// Author: Jon Smirl <jonsmirl@gmail.com>
7
8#include <linux/mod_devicetable.h>
9#include <linux/module.h>
10#include <linux/delay.h>
11#include <linux/time.h>
12
13#include <sound/pcm.h>
14#include <sound/pcm_params.h>
15#include <sound/soc.h>
16
17#include <asm/time.h>
18#include <asm/delay.h>
19#include <asm/mpc52xx.h>
20#include <asm/mpc52xx_psc.h>
21
22#include "mpc5200_dma.h"
23
24#define DRV_NAME "mpc5200-psc-ac97"
25
26/* ALSA only supports a single AC97 device so static is recommend here */
27static struct psc_dma *psc_dma;
28
29static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
30{
31 int status;
32 unsigned int val;
33
34 mutex_lock(&psc_dma->mutex);
35
36 /* Wait for command send status zero = ready */
37 status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
38 MPC52xx_PSC_SR_CMDSEND), 100, 0);
39 if (status == 0) {
40 pr_err("timeout on ac97 bus (rdy)\n");
41 mutex_unlock(lock: &psc_dma->mutex);
42 return -ENODEV;
43 }
44
45 /* Force clear the data valid bit */
46 in_be32(&psc_dma->psc_regs->ac97_data);
47
48 /* Send the read */
49 out_be32(&psc_dma->psc_regs->ac97_cmd, (1<<31) | ((reg & 0x7f) << 24));
50
51 /* Wait for the answer */
52 status = spin_event_timeout((in_be16(&psc_dma->psc_regs->sr_csr.status) &
53 MPC52xx_PSC_SR_DATA_VAL), 100, 0);
54 if (status == 0) {
55 pr_err("timeout on ac97 read (val) %x\n",
56 in_be16(&psc_dma->psc_regs->sr_csr.status));
57 mutex_unlock(lock: &psc_dma->mutex);
58 return -ENODEV;
59 }
60 /* Get the data */
61 val = in_be32(&psc_dma->psc_regs->ac97_data);
62 if (((val >> 24) & 0x7f) != reg) {
63 pr_err("reg echo error on ac97 read\n");
64 mutex_unlock(lock: &psc_dma->mutex);
65 return -ENODEV;
66 }
67 val = (val >> 8) & 0xffff;
68
69 mutex_unlock(lock: &psc_dma->mutex);
70 return (unsigned short) val;
71}
72
73static void psc_ac97_write(struct snd_ac97 *ac97,
74 unsigned short reg, unsigned short val)
75{
76 int status;
77
78 mutex_lock(&psc_dma->mutex);
79
80 /* Wait for command status zero = ready */
81 status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
82 MPC52xx_PSC_SR_CMDSEND), 100, 0);
83 if (status == 0) {
84 pr_err("timeout on ac97 bus (write)\n");
85 goto out;
86 }
87 /* Write data */
88 out_be32(&psc_dma->psc_regs->ac97_cmd,
89 ((reg & 0x7f) << 24) | (val << 8));
90
91 out:
92 mutex_unlock(lock: &psc_dma->mutex);
93}
94
95static void psc_ac97_warm_reset(struct snd_ac97 *ac97)
96{
97 struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
98
99 mutex_lock(&psc_dma->mutex);
100
101 out_be32(&regs->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_AWR);
102 udelay(3);
103 out_be32(&regs->sicr, psc_dma->sicr);
104
105 mutex_unlock(lock: &psc_dma->mutex);
106}
107
108static void psc_ac97_cold_reset(struct snd_ac97 *ac97)
109{
110 struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
111
112 mutex_lock(&psc_dma->mutex);
113 dev_dbg(psc_dma->dev, "cold reset\n");
114
115 mpc5200_psc_ac97_gpio_reset(psc_dma->id);
116
117 /* Notify the PSC that a reset has occurred */
118 out_be32(&regs->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_ACRB);
119
120 /* Re-enable RX and TX */
121 out_8(&regs->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
122
123 mutex_unlock(lock: &psc_dma->mutex);
124
125 usleep_range(min: 1000, max: 2000);
126 psc_ac97_warm_reset(ac97);
127}
128
129static struct snd_ac97_bus_ops psc_ac97_ops = {
130 .read = psc_ac97_read,
131 .write = psc_ac97_write,
132 .reset = psc_ac97_cold_reset,
133 .warm_reset = psc_ac97_warm_reset,
134};
135
136static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream,
137 struct snd_pcm_hw_params *params,
138 struct snd_soc_dai *cpu_dai)
139{
140 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(dai: cpu_dai);
141 struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
142
143 dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
144 " periods=%i buffer_size=%i buffer_bytes=%i channels=%i"
145 " rate=%i format=%i\n",
146 __func__, substream, params_period_size(params),
147 params_period_bytes(params), params_periods(params),
148 params_buffer_size(params), params_buffer_bytes(params),
149 params_channels(params), params_rate(params),
150 params_format(params));
151
152 /* Determine the set of enable bits to turn on */
153 s->ac97_slot_bits = (params_channels(p: params) == 1) ? 0x100 : 0x300;
154 if (substream->pstr->stream != SNDRV_PCM_STREAM_CAPTURE)
155 s->ac97_slot_bits <<= 16;
156 return 0;
157}
158
159static int psc_ac97_hw_digital_params(struct snd_pcm_substream *substream,
160 struct snd_pcm_hw_params *params,
161 struct snd_soc_dai *cpu_dai)
162{
163 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(dai: cpu_dai);
164
165 dev_dbg(psc_dma->dev, "%s(substream=%p)\n", __func__, substream);
166
167 if (params_channels(p: params) == 1)
168 out_be32(&psc_dma->psc_regs->ac97_slots, 0x01000000);
169 else
170 out_be32(&psc_dma->psc_regs->ac97_slots, 0x03000000);
171
172 return 0;
173}
174
175static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
176 struct snd_soc_dai *dai)
177{
178 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(dai);
179 struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
180
181 switch (cmd) {
182 case SNDRV_PCM_TRIGGER_START:
183 dev_dbg(psc_dma->dev, "AC97 START: stream=%i\n",
184 substream->pstr->stream);
185
186 /* Set the slot enable bits */
187 psc_dma->slots |= s->ac97_slot_bits;
188 out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
189 break;
190
191 case SNDRV_PCM_TRIGGER_STOP:
192 dev_dbg(psc_dma->dev, "AC97 STOP: stream=%i\n",
193 substream->pstr->stream);
194
195 /* Clear the slot enable bits */
196 psc_dma->slots &= ~(s->ac97_slot_bits);
197 out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
198 break;
199 }
200 return 0;
201}
202
203static int psc_ac97_probe(struct snd_soc_dai *cpu_dai)
204{
205 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(dai: cpu_dai);
206 struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
207
208 /* Go */
209 out_8(&regs->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
210 return 0;
211}
212
213/* ---------------------------------------------------------------------
214 * ALSA SoC Bindings
215 *
216 * - Digital Audio Interface (DAI) template
217 * - create/destroy dai hooks
218 */
219
220/**
221 * psc_ac97_dai_template: template CPU Digital Audio Interface
222 */
223static const struct snd_soc_dai_ops psc_ac97_analog_ops = {
224 .probe = psc_ac97_probe,
225 .hw_params = psc_ac97_hw_analog_params,
226 .trigger = psc_ac97_trigger,
227};
228
229static const struct snd_soc_dai_ops psc_ac97_digital_ops = {
230 .hw_params = psc_ac97_hw_digital_params,
231};
232
233static struct snd_soc_dai_driver psc_ac97_dai[] = {
234{
235 .name = "mpc5200-psc-ac97.0",
236 .playback = {
237 .stream_name = "AC97 Playback",
238 .channels_min = 1,
239 .channels_max = 6,
240 .rates = SNDRV_PCM_RATE_8000_48000,
241 .formats = SNDRV_PCM_FMTBIT_S32_BE,
242 },
243 .capture = {
244 .stream_name = "AC97 Capture",
245 .channels_min = 1,
246 .channels_max = 2,
247 .rates = SNDRV_PCM_RATE_8000_48000,
248 .formats = SNDRV_PCM_FMTBIT_S32_BE,
249 },
250 .ops = &psc_ac97_analog_ops,
251},
252{
253 .name = "mpc5200-psc-ac97.1",
254 .playback = {
255 .stream_name = "AC97 SPDIF",
256 .channels_min = 1,
257 .channels_max = 2,
258 .rates = SNDRV_PCM_RATE_32000 | \
259 SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
260 .formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE,
261 },
262 .ops = &psc_ac97_digital_ops,
263} };
264
265static const struct snd_soc_component_driver psc_ac97_component = {
266 .name = DRV_NAME,
267};
268
269
270/* ---------------------------------------------------------------------
271 * OF platform bus binding code:
272 * - Probe/remove operations
273 * - OF device match table
274 */
275static int psc_ac97_of_probe(struct platform_device *op)
276{
277 int rc;
278 struct mpc52xx_psc __iomem *regs;
279
280 rc = mpc5200_audio_dma_create(op);
281 if (rc != 0)
282 return rc;
283
284 rc = snd_soc_set_ac97_ops(ops: &psc_ac97_ops);
285 if (rc != 0) {
286 dev_err(&op->dev, "Failed to set AC'97 ops: %d\n", rc);
287 return rc;
288 }
289
290 rc = snd_soc_register_component(dev: &op->dev, component_driver: &psc_ac97_component,
291 dai_drv: psc_ac97_dai, ARRAY_SIZE(psc_ac97_dai));
292 if (rc != 0) {
293 dev_err(&op->dev, "Failed to register DAI\n");
294 return rc;
295 }
296
297 psc_dma = dev_get_drvdata(dev: &op->dev);
298 regs = psc_dma->psc_regs;
299
300 psc_dma->imr = 0;
301 out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
302
303 /* Configure the serial interface mode to AC97 */
304 psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 | MPC52xx_PSC_SICR_ENAC97;
305 out_be32(&regs->sicr, psc_dma->sicr);
306
307 /* No slots active */
308 out_be32(&regs->ac97_slots, 0x00000000);
309
310 return 0;
311}
312
313static void psc_ac97_of_remove(struct platform_device *op)
314{
315 mpc5200_audio_dma_destroy(op);
316 snd_soc_unregister_component(dev: &op->dev);
317 snd_soc_set_ac97_ops(NULL);
318}
319
320/* Match table for of_platform binding */
321static const struct of_device_id psc_ac97_match[] = {
322 { .compatible = "fsl,mpc5200-psc-ac97", },
323 { .compatible = "fsl,mpc5200b-psc-ac97", },
324 {}
325};
326MODULE_DEVICE_TABLE(of, psc_ac97_match);
327
328static struct platform_driver psc_ac97_driver = {
329 .probe = psc_ac97_of_probe,
330 .remove_new = psc_ac97_of_remove,
331 .driver = {
332 .name = "mpc5200-psc-ac97",
333 .of_match_table = psc_ac97_match,
334 },
335};
336
337module_platform_driver(psc_ac97_driver);
338
339MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>");
340MODULE_DESCRIPTION("mpc5200 AC97 module");
341MODULE_LICENSE("GPL");
342
343

source code of linux/sound/soc/fsl/mpc5200_psc_ac97.c