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 */ 32 static struct psc_dma *psc_dma; 33 34 static 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 78 static 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 } 99 100 static 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 } 112 113 static 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 } 133 134 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 { 146 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); 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 } 164 165 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 { 169 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); 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 } 180 181 static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd, 182 struct snd_soc_dai *dai) 183 { 184 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(dai); 185 struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma); 186 187 switch (cmd) { 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; 196 197 case SNDRV_PCM_TRIGGER_STOP: 198 dev_dbg(psc_dma->dev, "AC97 STOP: stream=%i\n", 199 substream->pstr->stream); 200 201 /* Clear the slot enable bits */ 202 psc_dma->slots &= ~(s->ac97_slot_bits); 203 out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots); 204 break; 205 } 206 return 0; 207 } 208 209 static int psc_ac97_probe(struct snd_soc_dai *cpu_dai) 210 { 211 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); 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 const 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 const struct snd_soc_dai_ops psc_ac97_digital_ops = { 235 .hw_params = psc_ac97_hw_digital_params, 236 }; 237 238 static struct snd_soc_dai_driver psc_ac97_dai[] = { 239 { 240 .name = "mpc5200-psc-ac97.0", 241 .ac97_control = 1, 242 .probe = psc_ac97_probe, 243 .playback = { 244 .stream_name = "AC97 Playback", 245 .channels_min = 1, 246 .channels_max = 6, 247 .rates = SNDRV_PCM_RATE_8000_48000, 248 .formats = SNDRV_PCM_FMTBIT_S32_BE, 249 }, 250 .capture = { 251 .stream_name = "AC97 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 = "mpc5200-psc-ac97.1", 261 .ac97_control = 1, 262 .playback = { 263 .stream_name = "AC97 SPDIF", 264 .channels_min = 1, 265 .channels_max = 2, 266 .rates = SNDRV_PCM_RATE_32000 | \ 267 SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000, 268 .formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE, 269 }, 270 .ops = &psc_ac97_digital_ops, 271 } }; 272 273 static const struct snd_soc_component_driver psc_ac97_component = { 274 .name = DRV_NAME, 275 }; 276 277 278 /* --------------------------------------------------------------------- 279 * OF platform bus binding code: 280 * - Probe/remove operations 281 * - OF device match table 282 */ 283 static int psc_ac97_of_probe(struct platform_device *op) 284 { 285 int rc; 286 struct snd_ac97 ac97; 287 struct mpc52xx_psc __iomem *regs; 288 289 rc = mpc5200_audio_dma_create(op); 290 if (rc != 0) 291 return rc; 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 ac97.private_data = psc_dma; 303 304 psc_dma->imr = 0; 305 out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr); 306 307 /* Configure the serial interface mode to AC97 */ 308 psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 | MPC52xx_PSC_SICR_ENAC97; 309 out_be32(®s->sicr, psc_dma->sicr); 310 311 /* No slots active */ 312 out_be32(®s->ac97_slots, 0x00000000); 313 314 return 0; 315 } 316 317 static int psc_ac97_of_remove(struct platform_device *op) 318 { 319 mpc5200_audio_dma_destroy(op); 320 snd_soc_unregister_component(&op->dev); 321 return 0; 322 } 323 324 /* Match table for of_platform binding */ 325 static 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 .owner = THIS_MODULE, 338 .of_match_table = psc_ac97_match, 339 }, 340 }; 341 342 module_platform_driver(psc_ac97_driver); 343 344 MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>"); 345 MODULE_DESCRIPTION("mpc5200 AC97 module"); 346 MODULE_LICENSE("GPL"); 347 348