1/* 2 * Copyright (c) 2009-2010 Nuvoton technology corporation. 3 * 4 * Wan ZongShun <mcuos.com@gmail.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation;version 2 of the License. 9 * 10 */ 11 12#include <linux/init.h> 13#include <linux/module.h> 14#include <linux/slab.h> 15#include <linux/device.h> 16#include <linux/delay.h> 17#include <linux/mutex.h> 18#include <linux/suspend.h> 19#include <sound/core.h> 20#include <sound/pcm.h> 21#include <sound/initval.h> 22#include <sound/soc.h> 23#include <linux/device.h> 24#include <linux/clk.h> 25 26#include <mach/mfp.h> 27 28#include "nuc900-audio.h" 29 30static DEFINE_MUTEX(ac97_mutex); 31struct nuc900_audio *nuc900_ac97_data; 32 33static int nuc900_checkready(void) 34{ 35 struct nuc900_audio *nuc900_audio = nuc900_ac97_data; 36 37 if (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS0) & CODEC_READY)) 38 return -EPERM; 39 40 return 0; 41} 42 43/* AC97 controller reads codec register */ 44static unsigned short nuc900_ac97_read(struct snd_ac97 *ac97, 45 unsigned short reg) 46{ 47 struct nuc900_audio *nuc900_audio = nuc900_ac97_data; 48 unsigned long timeout = 0x10000, val; 49 50 mutex_lock(&ac97_mutex); 51 52 val = nuc900_checkready(); 53 if (!!val) { 54 dev_err(nuc900_audio->dev, "AC97 codec is not ready\n"); 55 goto out; 56 } 57 58 /* set the R_WB bit and write register index */ 59 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, R_WB | reg); 60 61 /* set the valid frame bit and valid slots */ 62 val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0); 63 val |= (VALID_FRAME | SLOT1_VALID); 64 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val); 65 66 udelay(100); 67 68 /* polling the AC_R_FINISH */ 69 while (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_R_FINISH) 70 && timeout--) 71 mdelay(1); 72 73 if (!timeout) { 74 dev_err(nuc900_audio->dev, "AC97 read register time out !\n"); 75 val = -EPERM; 76 goto out; 77 } 78 79 val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0) ; 80 val &= ~SLOT1_VALID; 81 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val); 82 83 if (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS1) >> 2 != reg) { 84 dev_err(nuc900_audio->dev, 85 "R_INDEX of REG_ACTL_ACIS1 not match!\n"); 86 } 87 88 udelay(100); 89 val = (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS2) & 0xFFFF); 90 91out: 92 mutex_unlock(&ac97_mutex); 93 return val; 94} 95 96/* AC97 controller writes to codec register */ 97static void nuc900_ac97_write(struct snd_ac97 *ac97, unsigned short reg, 98 unsigned short val) 99{ 100 struct nuc900_audio *nuc900_audio = nuc900_ac97_data; 101 unsigned long tmp, timeout = 0x10000; 102 103 mutex_lock(&ac97_mutex); 104 105 tmp = nuc900_checkready(); 106 if (!!tmp) 107 dev_err(nuc900_audio->dev, "AC97 codec is not ready\n"); 108 109 /* clear the R_WB bit and write register index */ 110 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, reg); 111 112 /* write register value */ 113 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS2, val); 114 115 /* set the valid frame bit and valid slots */ 116 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0); 117 tmp |= SLOT1_VALID | SLOT2_VALID | VALID_FRAME; 118 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp); 119 120 udelay(100); 121 122 /* polling the AC_W_FINISH */ 123 while ((AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_W_FINISH) 124 && timeout--) 125 mdelay(1); 126 127 if (!timeout) 128 dev_err(nuc900_audio->dev, "AC97 write register time out !\n"); 129 130 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0); 131 tmp &= ~(SLOT1_VALID | SLOT2_VALID); 132 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp); 133 134 mutex_unlock(&ac97_mutex); 135 136} 137 138static void nuc900_ac97_warm_reset(struct snd_ac97 *ac97) 139{ 140 struct nuc900_audio *nuc900_audio = nuc900_ac97_data; 141 unsigned long val; 142 143 mutex_lock(&ac97_mutex); 144 145 /* warm reset AC 97 */ 146 val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON); 147 val |= AC_W_RES; 148 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val); 149 150 udelay(100); 151 152 val = nuc900_checkready(); 153 if (!!val) 154 dev_err(nuc900_audio->dev, "AC97 codec is not ready\n"); 155 156 mutex_unlock(&ac97_mutex); 157} 158 159static void nuc900_ac97_cold_reset(struct snd_ac97 *ac97) 160{ 161 struct nuc900_audio *nuc900_audio = nuc900_ac97_data; 162 unsigned long val; 163 164 mutex_lock(&ac97_mutex); 165 166 /* reset Audio Controller */ 167 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); 168 val |= ACTL_RESET_BIT; 169 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); 170 171 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); 172 val &= (~ACTL_RESET_BIT); 173 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); 174 175 /* reset AC-link interface */ 176 177 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); 178 val |= AC_RESET; 179 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); 180 181 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); 182 val &= ~AC_RESET; 183 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); 184 185 /* cold reset AC 97 */ 186 val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON); 187 val |= AC_C_RES; 188 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val); 189 190 val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON); 191 val &= (~AC_C_RES); 192 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val); 193 194 udelay(100); 195 196 mutex_unlock(&ac97_mutex); 197 198} 199 200/* AC97 controller operations */ 201struct snd_ac97_bus_ops soc_ac97_ops = { 202 .read = nuc900_ac97_read, 203 .write = nuc900_ac97_write, 204 .reset = nuc900_ac97_cold_reset, 205 .warm_reset = nuc900_ac97_warm_reset, 206} 207EXPORT_SYMBOL_GPL(soc_ac97_ops); 208 209static int nuc900_ac97_trigger(struct snd_pcm_substream *substream, 210 int cmd, struct snd_soc_dai *dai) 211{ 212 struct nuc900_audio *nuc900_audio = nuc900_ac97_data; 213 int ret; 214 unsigned long val, tmp; 215 216 ret = 0; 217 218 switch (cmd) { 219 case SNDRV_PCM_TRIGGER_START: 220 case SNDRV_PCM_TRIGGER_RESUME: 221 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); 222 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 223 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0); 224 tmp |= (SLOT3_VALID | SLOT4_VALID | VALID_FRAME); 225 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp); 226 227 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR); 228 tmp |= (P_DMA_END_IRQ | P_DMA_MIDDLE_IRQ); 229 AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, tmp); 230 val |= AC_PLAY; 231 } else { 232 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR); 233 tmp |= (R_DMA_END_IRQ | R_DMA_MIDDLE_IRQ); 234 235 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, tmp); 236 val |= AC_RECORD; 237 } 238 239 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); 240 241 break; 242 case SNDRV_PCM_TRIGGER_STOP: 243 case SNDRV_PCM_TRIGGER_SUSPEND: 244 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); 245 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 246 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0); 247 tmp &= ~(SLOT3_VALID | SLOT4_VALID); 248 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp); 249 250 AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, RESET_PRSR); 251 val &= ~AC_PLAY; 252 } else { 253 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, RESET_PRSR); 254 val &= ~AC_RECORD; 255 } 256 257 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); 258 259 break; 260 default: 261 ret = -EINVAL; 262 } 263 264 return ret; 265} 266 267static int nuc900_ac97_probe(struct platform_device *pdev, 268 struct snd_soc_dai *dai) 269{ 270 struct nuc900_audio *nuc900_audio = nuc900_ac97_data; 271 unsigned long val; 272 273 mutex_lock(&ac97_mutex); 274 275 /* enable unit clock */ 276 clk_enable(nuc900_audio->clk); 277 278 /* enable audio controller and AC-link interface */ 279 val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON); 280 val |= (IIS_AC_PIN_SEL | ACLINK_EN); 281 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val); 282 283 mutex_unlock(&ac97_mutex); 284 285 return 0; 286} 287 288static void nuc900_ac97_remove(struct platform_device *pdev, 289 struct snd_soc_dai *dai) 290{ 291 struct nuc900_audio *nuc900_audio = nuc900_ac97_data; 292 293 clk_disable(nuc900_audio->clk); 294} 295 296static struct snd_soc_dai_ops nuc900_ac97_dai_ops = { 297 .trigger = nuc900_ac97_trigger, 298}; 299 300struct snd_soc_dai nuc900_ac97_dai = { 301 .name = "nuc900-ac97", 302 .probe = nuc900_ac97_probe, 303 .remove = nuc900_ac97_remove, 304 .ac97_control = 1, 305 .playback = { 306 .rates = SNDRV_PCM_RATE_8000_48000, 307 .formats = SNDRV_PCM_FMTBIT_S16_LE, 308 .channels_min = 1, 309 .channels_max = 2, 310 }, 311 .capture = { 312 .rates = SNDRV_PCM_RATE_8000_48000, 313 .formats = SNDRV_PCM_FMTBIT_S16_LE, 314 .channels_min = 1, 315 .channels_max = 2, 316 }, 317 .ops = &nuc900_ac97_dai_ops, 318} 319EXPORT_SYMBOL_GPL(nuc900_ac97_dai); 320 321static int __devinit nuc900_ac97_drvprobe(struct platform_device *pdev) 322{ 323 struct nuc900_audio *nuc900_audio; 324 int ret; 325 326 if (nuc900_ac97_data) 327 return -EBUSY; 328 329 nuc900_audio = kzalloc(sizeof(struct nuc900_audio), GFP_KERNEL); 330 if (!nuc900_audio) 331 return -ENOMEM; 332 333 spin_lock_init(&nuc900_audio->lock); 334 335 nuc900_audio->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 336 if (!nuc900_audio->res) { 337 ret = -ENODEV; 338 goto out0; 339 } 340 341 if (!request_mem_region(nuc900_audio->res->start, 342 resource_size(nuc900_audio->res), pdev->name)) { 343 ret = -EBUSY; 344 goto out0; 345 } 346 347 nuc900_audio->mmio = ioremap(nuc900_audio->res->start, 348 resource_size(nuc900_audio->res)); 349 if (!nuc900_audio->mmio) { 350 ret = -ENOMEM; 351 goto out1; 352 } 353 354 nuc900_audio->clk = clk_get(&pdev->dev, NULL); 355 if (IS_ERR(nuc900_audio->clk)) { 356 ret = PTR_ERR(nuc900_audio->clk); 357 goto out2; 358 } 359 360 nuc900_audio->irq_num = platform_get_irq(pdev, 0); 361 if (!nuc900_audio->irq_num) { 362 ret = -EBUSY; 363 goto out2; 364 } 365 366 nuc900_ac97_data = nuc900_audio; 367 368 nuc900_audio->dev = nuc900_ac97_dai.dev = &pdev->dev; 369 370 ret = snd_soc_register_dai(&nuc900_ac97_dai); 371 if (ret) 372 goto out3; 373 374 mfp_set_groupg(nuc900_audio->dev); /* enbale ac97 multifunction pin*/ 375 376 return 0; 377 378out3: 379 clk_put(nuc900_audio->clk); 380out2: 381 iounmap(nuc900_audio->mmio); 382out1: 383 release_mem_region(nuc900_audio->res->start, 384 resource_size(nuc900_audio->res)); 385out0: 386 kfree(nuc900_audio); 387 return ret; 388} 389 390static int __devexit nuc900_ac97_drvremove(struct platform_device *pdev) 391{ 392 393 snd_soc_unregister_dai(&nuc900_ac97_dai); 394 395 clk_put(nuc900_ac97_data->clk); 396 iounmap(nuc900_ac97_data->mmio); 397 release_mem_region(nuc900_ac97_data->res->start, 398 resource_size(nuc900_ac97_data->res)); 399 400 nuc900_ac97_data = NULL; 401 402 return 0; 403} 404 405static struct platform_driver nuc900_ac97_driver = { 406 .driver = { 407 .name = "nuc900-audio", 408 .owner = THIS_MODULE, 409 }, 410 .probe = nuc900_ac97_drvprobe, 411 .remove = __devexit_p(nuc900_ac97_drvremove), 412}; 413 414static int __init nuc900_ac97_init(void) 415{ 416 return platform_driver_register(&nuc900_ac97_driver); 417} 418 419static void __exit nuc900_ac97_exit(void) 420{ 421 platform_driver_unregister(&nuc900_ac97_driver); 422} 423 424module_init(nuc900_ac97_init); 425module_exit(nuc900_ac97_exit); 426 427MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>"); 428MODULE_DESCRIPTION("NUC900 AC97 SoC driver!"); 429MODULE_LICENSE("GPL"); 430MODULE_ALIAS("platform:nuc900-ac97"); 431