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Linux/sound/soc/fsl/mpc5200_psc_ac97.c

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  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/module.h>
  9 #include <linux/of_device.h>
 10 #include <linux/of_platform.h>
 11 #include <linux/delay.h>
 12 #include <linux/time.h>
 13 
 14 #include <sound/pcm.h>
 15 #include <sound/pcm_params.h>
 16 #include <sound/soc.h>
 17 
 18 #include <asm/time.h>
 19 #include <asm/delay.h>
 20 #include <asm/mpc52xx.h>
 21 #include <asm/mpc52xx_psc.h>
 22 
 23 #include "mpc5200_dma.h"
 24 
 25 #define DRV_NAME "mpc5200-psc-ac97"
 26 
 27 /* ALSA only supports a single AC97 device so static is recommend here */
 28 static struct psc_dma *psc_dma;
 29 
 30 static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
 31 {
 32         int status;
 33         unsigned int val;
 34 
 35         mutex_lock(&psc_dma->mutex);
 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                 mutex_unlock(&psc_dma->mutex);
 43                 return -ENODEV;
 44         }
 45 
 46         /* Force clear the data valid bit */
 47         in_be32(&psc_dma->psc_regs->ac97_data);
 48 
 49         /* Send the read */
 50         out_be32(&psc_dma->psc_regs->ac97_cmd, (1<<31) | ((reg & 0x7f) << 24));
 51 
 52         /* Wait for the answer */
 53         status = spin_event_timeout((in_be16(&psc_dma->psc_regs->sr_csr.status) &
 54                                 MPC52xx_PSC_SR_DATA_VAL), 100, 0);
 55         if (status == 0) {
 56                 pr_err("timeout on ac97 read (val) %x\n",
 57                                 in_be16(&psc_dma->psc_regs->sr_csr.status));
 58                 mutex_unlock(&psc_dma->mutex);
 59                 return -ENODEV;
 60         }
 61         /* Get the data */
 62         val = in_be32(&psc_dma->psc_regs->ac97_data);
 63         if (((val >> 24) & 0x7f) != reg) {
 64                 pr_err("reg echo error on ac97 read\n");
 65                 mutex_unlock(&psc_dma->mutex);
 66                 return -ENODEV;
 67         }
 68         val = (val >> 8) & 0xffff;
 69 
 70         mutex_unlock(&psc_dma->mutex);
 71         return (unsigned short) val;
 72 }
 73 
 74 static void psc_ac97_write(struct snd_ac97 *ac97,
 75                                 unsigned short reg, unsigned short val)
 76 {
 77         int status;
 78 
 79         mutex_lock(&psc_dma->mutex);
 80 
 81         /* Wait for command status zero = ready */
 82         status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
 83                                 MPC52xx_PSC_SR_CMDSEND), 100, 0);
 84         if (status == 0) {
 85                 pr_err("timeout on ac97 bus (write)\n");
 86                 goto out;
 87         }
 88         /* Write data */
 89         out_be32(&psc_dma->psc_regs->ac97_cmd,
 90                         ((reg & 0x7f) << 24) | (val << 8));
 91 
 92  out:
 93         mutex_unlock(&psc_dma->mutex);
 94 }
 95 
 96 static void psc_ac97_warm_reset(struct snd_ac97 *ac97)
 97 {
 98         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 99 
100         mutex_lock(&psc_dma->mutex);
101 
102         out_be32(&regs->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_AWR);
103         udelay(3);
104         out_be32(&regs->sicr, psc_dma->sicr);
105 
106         mutex_unlock(&psc_dma->mutex);
107 }
108 
109 static void psc_ac97_cold_reset(struct snd_ac97 *ac97)
110 {
111         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
112 
113         mutex_lock(&psc_dma->mutex);
114         dev_dbg(psc_dma->dev, "cold reset\n");
115 
116         mpc5200_psc_ac97_gpio_reset(psc_dma->id);
117 
118         /* Notify the PSC that a reset has occurred */
119         out_be32(&regs->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_ACRB);
120 
121         /* Re-enable RX and TX */
122         out_8(&regs->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
123 
124         mutex_unlock(&psc_dma->mutex);
125 
126         usleep_range(1000, 2000);
127         psc_ac97_warm_reset(ac97);
128 }
129 
130 static struct snd_ac97_bus_ops psc_ac97_ops = {
131         .read           = psc_ac97_read,
132         .write          = psc_ac97_write,
133         .reset          = psc_ac97_cold_reset,
134         .warm_reset     = psc_ac97_warm_reset,
135 };
136 
137 static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream,
138                                  struct snd_pcm_hw_params *params,
139                                  struct snd_soc_dai *cpu_dai)
140 {
141         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
142         struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
143 
144         dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
145                 " periods=%i buffer_size=%i  buffer_bytes=%i channels=%i"
146                 " rate=%i format=%i\n",
147                 __func__, substream, params_period_size(params),
148                 params_period_bytes(params), params_periods(params),
149                 params_buffer_size(params), params_buffer_bytes(params),
150                 params_channels(params), params_rate(params),
151                 params_format(params));
152 
153         /* Determine the set of enable bits to turn on */
154         s->ac97_slot_bits = (params_channels(params) == 1) ? 0x100 : 0x300;
155         if (substream->pstr->stream != SNDRV_PCM_STREAM_CAPTURE)
156                 s->ac97_slot_bits <<= 16;
157         return 0;
158 }
159 
160 static int psc_ac97_hw_digital_params(struct snd_pcm_substream *substream,
161                                  struct snd_pcm_hw_params *params,
162                                  struct snd_soc_dai *cpu_dai)
163 {
164         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
165 
166         dev_dbg(psc_dma->dev, "%s(substream=%p)\n", __func__, substream);
167 
168         if (params_channels(params) == 1)
169                 out_be32(&psc_dma->psc_regs->ac97_slots, 0x01000000);
170         else
171                 out_be32(&psc_dma->psc_regs->ac97_slots, 0x03000000);
172 
173         return 0;
174 }
175 
176 static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
177                                                         struct snd_soc_dai *dai)
178 {
179         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(dai);
180         struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
181 
182         switch (cmd) {
183         case SNDRV_PCM_TRIGGER_START:
184                 dev_dbg(psc_dma->dev, "AC97 START: stream=%i\n",
185                         substream->pstr->stream);
186 
187                 /* Set the slot enable bits */
188                 psc_dma->slots |= s->ac97_slot_bits;
189                 out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
190                 break;
191 
192         case SNDRV_PCM_TRIGGER_STOP:
193                 dev_dbg(psc_dma->dev, "AC97 STOP: stream=%i\n",
194                         substream->pstr->stream);
195 
196                 /* Clear the slot enable bits */
197                 psc_dma->slots &= ~(s->ac97_slot_bits);
198                 out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
199                 break;
200         }
201         return 0;
202 }
203 
204 static int psc_ac97_probe(struct snd_soc_dai *cpu_dai)
205 {
206         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
207         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
208 
209         /* Go */
210         out_8(&regs->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
211         return 0;
212 }
213 
214 /* ---------------------------------------------------------------------
215  * ALSA SoC Bindings
216  *
217  * - Digital Audio Interface (DAI) template
218  * - create/destroy dai hooks
219  */
220 
221 /**
222  * psc_ac97_dai_template: template CPU Digital Audio Interface
223  */
224 static const struct snd_soc_dai_ops psc_ac97_analog_ops = {
225         .hw_params      = psc_ac97_hw_analog_params,
226         .trigger        = psc_ac97_trigger,
227 };
228 
229 static const struct snd_soc_dai_ops psc_ac97_digital_ops = {
230         .hw_params      = psc_ac97_hw_digital_params,
231 };
232 
233 static struct snd_soc_dai_driver psc_ac97_dai[] = {
234 {
235         .name = "mpc5200-psc-ac97.0",
236         .bus_control = true,
237         .probe  = psc_ac97_probe,
238         .playback = {
239                 .stream_name    = "AC97 Playback",
240                 .channels_min   = 1,
241                 .channels_max   = 6,
242                 .rates          = SNDRV_PCM_RATE_8000_48000,
243                 .formats = SNDRV_PCM_FMTBIT_S32_BE,
244         },
245         .capture = {
246                 .stream_name    = "AC97 Capture",
247                 .channels_min   = 1,
248                 .channels_max   = 2,
249                 .rates          = SNDRV_PCM_RATE_8000_48000,
250                 .formats = SNDRV_PCM_FMTBIT_S32_BE,
251         },
252         .ops = &psc_ac97_analog_ops,
253 },
254 {
255         .name = "mpc5200-psc-ac97.1",
256         .bus_control = true,
257         .playback = {
258                 .stream_name    = "AC97 SPDIF",
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 } };
267 
268 static const struct snd_soc_component_driver psc_ac97_component = {
269         .name           = DRV_NAME,
270 };
271 
272 
273 /* ---------------------------------------------------------------------
274  * OF platform bus binding code:
275  * - Probe/remove operations
276  * - OF device match table
277  */
278 static int psc_ac97_of_probe(struct platform_device *op)
279 {
280         int rc;
281         struct mpc52xx_psc __iomem *regs;
282 
283         rc = mpc5200_audio_dma_create(op);
284         if (rc != 0)
285                 return rc;
286 
287         rc = snd_soc_set_ac97_ops(&psc_ac97_ops);
288         if (rc != 0) {
289                 dev_err(&op->dev, "Failed to set AC'97 ops: %d\n", rc);
290                 return rc;
291         }
292 
293         rc = snd_soc_register_component(&op->dev, &psc_ac97_component,
294                                         psc_ac97_dai, ARRAY_SIZE(psc_ac97_dai));
295         if (rc != 0) {
296                 dev_err(&op->dev, "Failed to register DAI\n");
297                 return rc;
298         }
299 
300         psc_dma = dev_get_drvdata(&op->dev);
301         regs = psc_dma->psc_regs;
302 
303         psc_dma->imr = 0;
304         out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
305 
306         /* Configure the serial interface mode to AC97 */
307         psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 | MPC52xx_PSC_SICR_ENAC97;
308         out_be32(&regs->sicr, psc_dma->sicr);
309 
310         /* No slots active */
311         out_be32(&regs->ac97_slots, 0x00000000);
312 
313         return 0;
314 }
315 
316 static int psc_ac97_of_remove(struct platform_device *op)
317 {
318         mpc5200_audio_dma_destroy(op);
319         snd_soc_unregister_component(&op->dev);
320         snd_soc_set_ac97_ops(NULL);
321         return 0;
322 }
323 
324 /* Match table for of_platform binding */
325 static const struct of_device_id psc_ac97_match[] = {
326         { .compatible = "fsl,mpc5200-psc-ac97", },
327         { .compatible = "fsl,mpc5200b-psc-ac97", },
328         {}
329 };
330 MODULE_DEVICE_TABLE(of, psc_ac97_match);
331 
332 static struct platform_driver psc_ac97_driver = {
333         .probe = psc_ac97_of_probe,
334         .remove = psc_ac97_of_remove,
335         .driver = {
336                 .name = "mpc5200-psc-ac97",
337                 .of_match_table = psc_ac97_match,
338         },
339 };
340 
341 module_platform_driver(psc_ac97_driver);
342 
343 MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>");
344 MODULE_DESCRIPTION("mpc5200 AC97 module");
345 MODULE_LICENSE("GPL");
346 
347 

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