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/clk.h> 24 25#include <mach/mfp.h> 26 27#include "nuc900-audio.h" 28 29static DEFINE_MUTEX(ac97_mutex); 30struct nuc900_audio *nuc900_ac97_data; 31EXPORT_SYMBOL_GPL(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 */ 201static struct snd_ac97_bus_ops nuc900_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}; 207 208static int nuc900_ac97_trigger(struct snd_pcm_substream *substream, 209 int cmd, struct snd_soc_dai *dai) 210{ 211 struct nuc900_audio *nuc900_audio = nuc900_ac97_data; 212 int ret; 213 unsigned long val, tmp; 214 215 ret = 0; 216 217 switch (cmd) { 218 case SNDRV_PCM_TRIGGER_START: 219 case SNDRV_PCM_TRIGGER_RESUME: 220 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); 221 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 222 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0); 223 tmp |= (SLOT3_VALID | SLOT4_VALID | VALID_FRAME); 224 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp); 225 226 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR); 227 tmp |= (P_DMA_END_IRQ | P_DMA_MIDDLE_IRQ); 228 AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, tmp); 229 val |= AC_PLAY; 230 } else { 231 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR); 232 tmp |= (R_DMA_END_IRQ | R_DMA_MIDDLE_IRQ); 233 234 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, tmp); 235 val |= AC_RECORD; 236 } 237 238 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); 239 240 break; 241 case SNDRV_PCM_TRIGGER_STOP: 242 case SNDRV_PCM_TRIGGER_SUSPEND: 243 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); 244 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 245 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0); 246 tmp &= ~(SLOT3_VALID | SLOT4_VALID); 247 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp); 248 249 AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, RESET_PRSR); 250 val &= ~AC_PLAY; 251 } else { 252 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, RESET_PRSR); 253 val &= ~AC_RECORD; 254 } 255 256 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); 257 258 break; 259 default: 260 ret = -EINVAL; 261 } 262 263 return ret; 264} 265 266static int nuc900_ac97_probe(struct snd_soc_dai *dai) 267{ 268 struct nuc900_audio *nuc900_audio = nuc900_ac97_data; 269 unsigned long val; 270 271 mutex_lock(&ac97_mutex); 272 273 /* enable unit clock */ 274 clk_enable(nuc900_audio->clk); 275 276 /* enable audio controller and AC-link interface */ 277 val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON); 278 val |= (IIS_AC_PIN_SEL | ACLINK_EN); 279 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val); 280 281 mutex_unlock(&ac97_mutex); 282 283 return 0; 284} 285 286static int nuc900_ac97_remove(struct snd_soc_dai *dai) 287{ 288 struct nuc900_audio *nuc900_audio = nuc900_ac97_data; 289 290 clk_disable(nuc900_audio->clk); 291 return 0; 292} 293 294static const struct snd_soc_dai_ops nuc900_ac97_dai_ops = { 295 .trigger = nuc900_ac97_trigger, 296}; 297 298static struct snd_soc_dai_driver nuc900_ac97_dai = { 299 .probe = nuc900_ac97_probe, 300 .remove = nuc900_ac97_remove, 301 .bus_control = true, 302 .playback = { 303 .rates = SNDRV_PCM_RATE_8000_48000, 304 .formats = SNDRV_PCM_FMTBIT_S16_LE, 305 .channels_min = 1, 306 .channels_max = 2, 307 }, 308 .capture = { 309 .rates = SNDRV_PCM_RATE_8000_48000, 310 .formats = SNDRV_PCM_FMTBIT_S16_LE, 311 .channels_min = 1, 312 .channels_max = 2, 313 }, 314 .ops = &nuc900_ac97_dai_ops, 315}; 316 317static const struct snd_soc_component_driver nuc900_ac97_component = { 318 .name = "nuc900-ac97", 319}; 320 321static int 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 = devm_kzalloc(&pdev->dev, sizeof(struct nuc900_audio), 330 GFP_KERNEL); 331 if (!nuc900_audio) 332 return -ENOMEM; 333 334 spin_lock_init(&nuc900_audio->lock); 335 336 nuc900_audio->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 337 nuc900_audio->mmio = devm_ioremap_resource(&pdev->dev, 338 nuc900_audio->res); 339 if (IS_ERR(nuc900_audio->mmio)) 340 return PTR_ERR(nuc900_audio->mmio); 341 342 nuc900_audio->clk = devm_clk_get(&pdev->dev, NULL); 343 if (IS_ERR(nuc900_audio->clk)) { 344 ret = PTR_ERR(nuc900_audio->clk); 345 goto out; 346 } 347 348 nuc900_audio->irq_num = platform_get_irq(pdev, 0); 349 if (!nuc900_audio->irq_num) { 350 ret = -EBUSY; 351 goto out; 352 } 353 354 nuc900_ac97_data = nuc900_audio; 355 356 ret = snd_soc_set_ac97_ops(&nuc900_ac97_ops); 357 if (ret) 358 goto out; 359 360 ret = snd_soc_register_component(&pdev->dev, &nuc900_ac97_component, 361 &nuc900_ac97_dai, 1); 362 if (ret) 363 goto out; 364 365 /* enbale ac97 multifunction pin */ 366 mfp_set_groupg(nuc900_audio->dev, NULL); 367 368 return 0; 369 370out: 371 snd_soc_set_ac97_ops(NULL); 372 return ret; 373} 374 375static int nuc900_ac97_drvremove(struct platform_device *pdev) 376{ 377 snd_soc_unregister_component(&pdev->dev); 378 379 nuc900_ac97_data = NULL; 380 snd_soc_set_ac97_ops(NULL); 381 382 return 0; 383} 384 385static struct platform_driver nuc900_ac97_driver = { 386 .driver = { 387 .name = "nuc900-ac97", 388 }, 389 .probe = nuc900_ac97_drvprobe, 390 .remove = nuc900_ac97_drvremove, 391}; 392 393module_platform_driver(nuc900_ac97_driver); 394 395MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>"); 396MODULE_DESCRIPTION("NUC900 AC97 SoC driver!"); 397MODULE_LICENSE("GPL"); 398MODULE_ALIAS("platform:nuc900-ac97"); 399