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#include <linux/delay.h> 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.h> 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 */ 32static struct psc_dma *psc_dma; 33 34static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg) 35{ 36 int status; 37 unsigned int val; 38 39 mutex_lock(&psc_dma->mutex); 40 41 /* Wait for command send status zero = ready */ 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) { 45 pr_err("timeout on ac97 bus (rdy)\n"); 46 mutex_unlock(&psc_dma->mutex); 47 return -ENODEV; 48 } 49 50 /* Force clear the data valid bit */ 51 in_be32(&psc_dma->psc_regs->ac97_data); 52 53 /* Send the read */ 54 out_be32(&psc_dma->psc_regs->ac97_cmd, (1<<31) | ((reg & 0x7f) << 24)); 55 56 /* Wait for the answer */ 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) { 60 pr_err("timeout on ac97 read (val) %x\n", 61 in_be16(&psc_dma->psc_regs->sr_csr.status)); 62 mutex_unlock(&psc_dma->mutex); 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"); 69 mutex_unlock(&psc_dma->mutex); 70 return -ENODEV; 71 } 72 val = (val >> 8) & 0xffff; 73 74 mutex_unlock(&psc_dma->mutex); 75 return (unsigned short) val; 76} 77 78static void psc_ac97_write(struct snd_ac97 *ac97, 79 unsigned short reg, unsigned short val) 80{ 81 int status; 82 83 mutex_lock(&psc_dma->mutex); 84 85 /* Wait for command status zero = ready */ 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) { 89 pr_err("timeout on ac97 bus (write)\n"); 90 goto out; 91 } 92 /* Write data */ 93 out_be32(&psc_dma->psc_regs->ac97_cmd, 94 ((reg & 0x7f) << 24) | (val << 8)); 95 96 out: 97 mutex_unlock(&psc_dma->mutex); 98} 99 100static void psc_ac97_warm_reset(struct snd_ac97 *ac97) 101{ 102 struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; 103 104 mutex_lock(&psc_dma->mutex); 105 106 out_be32(®s->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_AWR); 107 udelay(3); 108 out_be32(®s->sicr, psc_dma->sicr); 109 110 mutex_unlock(&psc_dma->mutex); 111} 112 113static void psc_ac97_cold_reset(struct snd_ac97 *ac97) 114{ 115 struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; 116 117 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); 129 130 msleep(1); 131 psc_ac97_warm_reset(ac97); 132} 133 134struct 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}; 140EXPORT_SYMBOL_GPL(soc_ac97_ops); 141 142static 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{ 146 struct psc_dma *psc_dma = cpu_dai->private_data; 147 struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma); 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)); 157 158 /* 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; 162 return 0; 163} 164 165static 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{ 169 struct psc_dma *psc_dma = cpu_dai->private_data; 170 171 dev_dbg(psc_dma->dev, "%s(substream=%p)\n", __func__, substream); 172 173 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 181static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd, 182 struct snd_soc_dai *dai) 183{ 184 struct snd_soc_pcm_runtime *rtd = substream->private_data; 185 struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data; 186 struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma); 187 188 switch (cmd) { 189 case SNDRV_PCM_TRIGGER_START: 190 dev_dbg(psc_dma->dev, "AC97 START: stream=%i\n", 191 substream->pstr->stream); 192 193 /* Set the slot enable bits */ 194 psc_dma->slots |= s->ac97_slot_bits; 195 out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots); 196 break; 197 198 case SNDRV_PCM_TRIGGER_STOP: 199 dev_dbg(psc_dma->dev, "AC97 STOP: stream=%i\n", 200 substream->pstr->stream); 201 202 /* Clear the slot enable bits */ 203 psc_dma->slots &= ~(s->ac97_slot_bits); 204 out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots); 205 break; 206 } 207 return 0; 208} 209 210static int psc_ac97_probe(struct platform_device *pdev, 211 struct snd_soc_dai *cpu_dai) 212{ 213 struct psc_dma *psc_dma = cpu_dai->private_data; 214 struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; 215 216 /* Go */ 217 out_8(®s->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); 218 return 0; 219} 220 221/* --------------------------------------------------------------------- 222 * ALSA SoC Bindings 223 * 224 * - Digital Audio Interface (DAI) template 225 * - create/destroy dai hooks 226 */ 227 228/** 229 * psc_ac97_dai_template: template CPU Digital Audio Interface 230 */ 231static struct snd_soc_dai_ops psc_ac97_analog_ops = { 232 .hw_params = psc_ac97_hw_analog_params, 233 .trigger = psc_ac97_trigger, 234}; 235 236static struct snd_soc_dai_ops psc_ac97_digital_ops = { 237 .hw_params = psc_ac97_hw_digital_params, 238}; 239 240struct snd_soc_dai psc_ac97_dai[] = { 241{ 242 .name = "AC97", 243 .ac97_control = 1, 244 .probe = psc_ac97_probe, 245 .playback = { 246 .channels_min = 1, 247 .channels_max = 6, 248 .rates = SNDRV_PCM_RATE_8000_48000, 249 .formats = SNDRV_PCM_FMTBIT_S32_BE, 250 }, 251 .capture = { 252 .channels_min = 1, 253 .channels_max = 2, 254 .rates = SNDRV_PCM_RATE_8000_48000, 255 .formats = SNDRV_PCM_FMTBIT_S32_BE, 256 }, 257 .ops = &psc_ac97_analog_ops, 258}, 259{ 260 .name = "SPDIF", 261 .ac97_control = 1, 262 .playback = { 263 .channels_min = 1, 264 .channels_max = 2, 265 .rates = SNDRV_PCM_RATE_32000 | \ 266 SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000, 267 .formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE, 268 }, 269 .ops = &psc_ac97_digital_ops, 270} }; 271EXPORT_SYMBOL_GPL(psc_ac97_dai); 272 273 274 275/* --------------------------------------------------------------------- 276 * OF platform bus binding code: 277 * - Probe/remove operations 278 * - OF device match table 279 */ 280static int __devinit psc_ac97_of_probe(struct platform_device *op, 281 const struct of_device_id *match) 282{ 283 int rc, i; 284 struct snd_ac97 ac97; 285 struct mpc52xx_psc __iomem *regs; 286 287 rc = mpc5200_audio_dma_create(op); 288 if (rc != 0) 289 return rc; 290 291 for (i = 0; i < ARRAY_SIZE(psc_ac97_dai); i++) 292 psc_ac97_dai[i].dev = &op->dev; 293 294 rc = snd_soc_register_dais(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 ac97.private_data = psc_dma; 303 304 for (i = 0; i < ARRAY_SIZE(psc_ac97_dai); i++) 305 psc_ac97_dai[i].private_data = psc_dma; 306 307 psc_dma->imr = 0; 308 out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr); 309 310 /* Configure the serial interface mode to AC97 */ 311 psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 | MPC52xx_PSC_SICR_ENAC97; 312 out_be32(®s->sicr, psc_dma->sicr); 313 314 /* No slots active */ 315 out_be32(®s->ac97_slots, 0x00000000); 316 317 return 0; 318} 319 320static int __devexit psc_ac97_of_remove(struct platform_device *op) 321{ 322 return mpc5200_audio_dma_destroy(op); 323} 324 325/* Match table for of_platform binding */ 326static struct of_device_id psc_ac97_match[] __devinitdata = { 327 { .compatible = "fsl,mpc5200-psc-ac97", }, 328 { .compatible = "fsl,mpc5200b-psc-ac97", }, 329 {} 330}; 331MODULE_DEVICE_TABLE(of, psc_ac97_match); 332 333static struct of_platform_driver psc_ac97_driver = { 334 .probe = psc_ac97_of_probe, 335 .remove = __devexit_p(psc_ac97_of_remove), 336 .driver = { 337 .name = "mpc5200-psc-ac97", 338 .owner = THIS_MODULE, 339 .of_match_table = psc_ac97_match, 340 }, 341}; 342 343/* --------------------------------------------------------------------- 344 * Module setup and teardown; simply register the of_platform driver 345 * for the PSC in AC97 mode. 346 */ 347static int __init psc_ac97_init(void) 348{ 349 return of_register_platform_driver(&psc_ac97_driver); 350} 351module_init(psc_ac97_init); 352 353static void __exit psc_ac97_exit(void) 354{ 355 of_unregister_platform_driver(&psc_ac97_driver); 356} 357module_exit(psc_ac97_exit); 358 359MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>"); 360MODULE_DESCRIPTION("mpc5200 AC97 module"); 361MODULE_LICENSE("GPL"); 362