1 /* 2 * linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip. 3 * 4 * Author: Nicolas Pitre 5 * Created: Dec 02, 2004 6 * Copyright: MontaVista Software Inc. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/init.h> 14 #include <linux/module.h> 15 #include <linux/platform_device.h> 16 #include <linux/interrupt.h> 17 #include <linux/wait.h> 18 #include <linux/clk.h> 19 #include <linux/delay.h> 20 21 #include <sound/core.h> 22 #include <sound/pcm.h> 23 #include <sound/ac97_codec.h> 24 #include <sound/initval.h> 25 #include <sound/soc.h> 26 27 #include <asm/irq.h> 28 #include <linux/mutex.h> 29 #include <mach/hardware.h> 30 #include <mach/pxa-regs.h> 31 #include <mach/pxa2xx-gpio.h> 32 #include <mach/audio.h> 33 34 #include "pxa2xx-pcm.h" 35 #include "pxa2xx-ac97.h" 36 37 static DEFINE_MUTEX(car_mutex); 38 static DECLARE_WAIT_QUEUE_HEAD(gsr_wq); 39 static volatile long gsr_bits; 40 static struct clk *ac97_clk; 41 #ifdef CONFIG_PXA27x 42 static struct clk *ac97conf_clk; 43 #endif 44 45 /* 46 * Beware PXA27x bugs: 47 * 48 * o Slot 12 read from modem space will hang controller. 49 * o CDONE, SDONE interrupt fails after any slot 12 IO. 50 * 51 * We therefore have an hybrid approach for waiting on SDONE (interrupt or 52 * 1 jiffy timeout if interrupt never comes). 53 */ 54 55 static unsigned short pxa2xx_ac97_read(struct snd_ac97 *ac97, 56 unsigned short reg) 57 { 58 unsigned short val = -1; 59 volatile u32 *reg_addr; 60 61 mutex_lock(&car_mutex); 62 63 /* set up primary or secondary codec/modem space */ 64 #if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx) 65 reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE; 66 #else 67 if (reg == AC97_GPIO_STATUS) 68 reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE; 69 else 70 reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE; 71 #endif 72 reg_addr += (reg >> 1); 73 74 #ifndef CONFIG_PXA27x 75 if (reg == AC97_GPIO_STATUS) { 76 /* read from controller cache */ 77 val = *reg_addr; 78 goto out; 79 } 80 #endif 81 82 /* start read access across the ac97 link */ 83 GSR = GSR_CDONE | GSR_SDONE; 84 gsr_bits = 0; 85 val = *reg_addr; 86 87 wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1); 88 if (!((GSR | gsr_bits) & GSR_SDONE)) { 89 printk(KERN_ERR "%s: read error (ac97_reg=%x GSR=%#lx)\n", 90 __func__, reg, GSR | gsr_bits); 91 val = -1; 92 goto out; 93 } 94 95 /* valid data now */ 96 GSR = GSR_CDONE | GSR_SDONE; 97 gsr_bits = 0; 98 val = *reg_addr; 99 /* but we've just started another cycle... */ 100 wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1); 101 102 out: mutex_unlock(&car_mutex); 103 return val; 104 } 105 106 static void pxa2xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg, 107 unsigned short val) 108 { 109 volatile u32 *reg_addr; 110 111 mutex_lock(&car_mutex); 112 113 /* set up primary or secondary codec/modem space */ 114 #if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx) 115 reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE; 116 #else 117 if (reg == AC97_GPIO_STATUS) 118 reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE; 119 else 120 reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE; 121 #endif 122 reg_addr += (reg >> 1); 123 124 GSR = GSR_CDONE | GSR_SDONE; 125 gsr_bits = 0; 126 *reg_addr = val; 127 wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_CDONE, 1); 128 if (!((GSR | gsr_bits) & GSR_CDONE)) 129 printk(KERN_ERR "%s: write error (ac97_reg=%x GSR=%#lx)\n", 130 __func__, reg, GSR | gsr_bits); 131 132 mutex_unlock(&car_mutex); 133 } 134 135 static void pxa2xx_ac97_warm_reset(struct snd_ac97 *ac97) 136 { 137 #ifdef CONFIG_PXA3xx 138 int timeout = 100; 139 #endif 140 gsr_bits = 0; 141 142 #ifdef CONFIG_PXA27x 143 /* warm reset broken on Bulverde, 144 so manually keep AC97 reset high */ 145 pxa_gpio_mode(113 | GPIO_OUT | GPIO_DFLT_HIGH); 146 udelay(10); 147 GCR |= GCR_WARM_RST; 148 pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT); 149 udelay(500); 150 #elif defined(CONFIG_PXA3xx) 151 /* Can't use interrupts */ 152 GCR |= GCR_WARM_RST; 153 while (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--) 154 mdelay(1); 155 #else 156 GCR |= GCR_WARM_RST | GCR_PRIRDY_IEN | GCR_SECRDY_IEN; 157 wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1); 158 #endif 159 160 if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR))) 161 printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n", 162 __func__, gsr_bits); 163 164 GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN); 165 GCR |= GCR_SDONE_IE|GCR_CDONE_IE; 166 } 167 168 static void pxa2xx_ac97_cold_reset(struct snd_ac97 *ac97) 169 { 170 #ifdef CONFIG_PXA3xx 171 int timeout = 1000; 172 173 /* Hold CLKBPB for 100us */ 174 GCR = 0; 175 GCR = GCR_CLKBPB; 176 udelay(100); 177 GCR = 0; 178 #endif 179 180 GCR &= GCR_COLD_RST; /* clear everything but nCRST */ 181 GCR &= ~GCR_COLD_RST; /* then assert nCRST */ 182 183 gsr_bits = 0; 184 #ifdef CONFIG_PXA27x 185 /* PXA27x Developers Manual section 13.5.2.2.1 */ 186 clk_enable(ac97conf_clk); 187 udelay(5); 188 clk_disable(ac97conf_clk); 189 GCR = GCR_COLD_RST; 190 udelay(50); 191 #elif defined(CONFIG_PXA3xx) 192 /* Can't use interrupts on PXA3xx */ 193 GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN); 194 195 GCR = GCR_WARM_RST | GCR_COLD_RST; 196 while (!(GSR & (GSR_PCR | GSR_SCR)) && timeout--) 197 mdelay(10); 198 #else 199 GCR = GCR_COLD_RST; 200 GCR |= GCR_CDONE_IE|GCR_SDONE_IE; 201 wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1); 202 #endif 203 204 if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR))) 205 printk(KERN_INFO "%s: cold reset timeout (GSR=%#lx)\n", 206 __func__, gsr_bits); 207 208 GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN); 209 GCR |= GCR_SDONE_IE|GCR_CDONE_IE; 210 } 211 212 static irqreturn_t pxa2xx_ac97_irq(int irq, void *dev_id) 213 { 214 long status; 215 216 status = GSR; 217 if (status) { 218 GSR = status; 219 gsr_bits |= status; 220 wake_up(&gsr_wq); 221 222 #ifdef CONFIG_PXA27x 223 /* Although we don't use those we still need to clear them 224 since they tend to spuriously trigger when MMC is used 225 (hardware bug? go figure)... */ 226 MISR = MISR_EOC; 227 PISR = PISR_EOC; 228 MCSR = MCSR_EOC; 229 #endif 230 231 return IRQ_HANDLED; 232 } 233 234 return IRQ_NONE; 235 } 236 237 struct snd_ac97_bus_ops soc_ac97_ops = { 238 .read = pxa2xx_ac97_read, 239 .write = pxa2xx_ac97_write, 240 .warm_reset = pxa2xx_ac97_warm_reset, 241 .reset = pxa2xx_ac97_cold_reset, 242 }; 243 244 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_stereo_out = { 245 .name = "AC97 PCM Stereo out", 246 .dev_addr = __PREG(PCDR), 247 .drcmr = &DRCMRTXPCDR, 248 .dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG | 249 DCMD_BURST32 | DCMD_WIDTH4, 250 }; 251 252 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_stereo_in = { 253 .name = "AC97 PCM Stereo in", 254 .dev_addr = __PREG(PCDR), 255 .drcmr = &DRCMRRXPCDR, 256 .dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC | 257 DCMD_BURST32 | DCMD_WIDTH4, 258 }; 259 260 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_aux_mono_out = { 261 .name = "AC97 Aux PCM (Slot 5) Mono out", 262 .dev_addr = __PREG(MODR), 263 .drcmr = &DRCMRTXMODR, 264 .dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG | 265 DCMD_BURST16 | DCMD_WIDTH2, 266 }; 267 268 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_aux_mono_in = { 269 .name = "AC97 Aux PCM (Slot 5) Mono in", 270 .dev_addr = __PREG(MODR), 271 .drcmr = &DRCMRRXMODR, 272 .dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC | 273 DCMD_BURST16 | DCMD_WIDTH2, 274 }; 275 276 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_mic_mono_in = { 277 .name = "AC97 Mic PCM (Slot 6) Mono in", 278 .dev_addr = __PREG(MCDR), 279 .drcmr = &DRCMRRXMCDR, 280 .dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC | 281 DCMD_BURST16 | DCMD_WIDTH2, 282 }; 283 284 #ifdef CONFIG_PM 285 static int pxa2xx_ac97_suspend(struct platform_device *pdev, 286 struct snd_soc_dai *dai) 287 { 288 GCR |= GCR_ACLINK_OFF; 289 clk_disable(ac97_clk); 290 return 0; 291 } 292 293 static int pxa2xx_ac97_resume(struct platform_device *pdev, 294 struct snd_soc_dai *dai) 295 { 296 clk_enable(ac97_clk); 297 return 0; 298 } 299 300 #else 301 #define pxa2xx_ac97_suspend NULL 302 #define pxa2xx_ac97_resume NULL 303 #endif 304 305 static int pxa2xx_ac97_probe(struct platform_device *pdev, 306 struct snd_soc_dai *dai) 307 { 308 int ret; 309 310 ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, IRQF_DISABLED, "AC97", NULL); 311 if (ret < 0) 312 goto err; 313 314 pxa_gpio_mode(GPIO31_SYNC_AC97_MD); 315 pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD); 316 pxa_gpio_mode(GPIO28_BITCLK_AC97_MD); 317 pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD); 318 #ifdef CONFIG_PXA27x 319 /* Use GPIO 113 as AC97 Reset on Bulverde */ 320 pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT); 321 322 ac97conf_clk = clk_get(&pdev->dev, "AC97CONFCLK"); 323 if (IS_ERR(ac97conf_clk)) { 324 ret = PTR_ERR(ac97conf_clk); 325 ac97conf_clk = NULL; 326 goto err_irq; 327 } 328 #endif 329 ac97_clk = clk_get(&pdev->dev, "AC97CLK"); 330 if (IS_ERR(ac97_clk)) { 331 ret = PTR_ERR(ac97_clk); 332 ac97_clk = NULL; 333 goto err_irq; 334 } 335 clk_enable(ac97_clk); 336 return 0; 337 338 err_irq: 339 GCR |= GCR_ACLINK_OFF; 340 #ifdef CONFIG_PXA27x 341 if (ac97conf_clk) { 342 clk_put(ac97conf_clk); 343 ac97conf_clk = NULL; 344 } 345 #endif 346 free_irq(IRQ_AC97, NULL); 347 err: 348 return ret; 349 } 350 351 static void pxa2xx_ac97_remove(struct platform_device *pdev, 352 struct snd_soc_dai *dai) 353 { 354 GCR |= GCR_ACLINK_OFF; 355 free_irq(IRQ_AC97, NULL); 356 #ifdef CONFIG_PXA27x 357 clk_put(ac97conf_clk); 358 ac97conf_clk = NULL; 359 #endif 360 clk_disable(ac97_clk); 361 clk_put(ac97_clk); 362 ac97_clk = NULL; 363 } 364 365 static int pxa2xx_ac97_hw_params(struct snd_pcm_substream *substream, 366 struct snd_pcm_hw_params *params) 367 { 368 struct snd_soc_pcm_runtime *rtd = substream->private_data; 369 struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai; 370 371 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 372 cpu_dai->dma_data = &pxa2xx_ac97_pcm_stereo_out; 373 else 374 cpu_dai->dma_data = &pxa2xx_ac97_pcm_stereo_in; 375 376 return 0; 377 } 378 379 static int pxa2xx_ac97_hw_aux_params(struct snd_pcm_substream *substream, 380 struct snd_pcm_hw_params *params) 381 { 382 struct snd_soc_pcm_runtime *rtd = substream->private_data; 383 struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai; 384 385 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 386 cpu_dai->dma_data = &pxa2xx_ac97_pcm_aux_mono_out; 387 else 388 cpu_dai->dma_data = &pxa2xx_ac97_pcm_aux_mono_in; 389 390 return 0; 391 } 392 393 static int pxa2xx_ac97_hw_mic_params(struct snd_pcm_substream *substream, 394 struct snd_pcm_hw_params *params) 395 { 396 struct snd_soc_pcm_runtime *rtd = substream->private_data; 397 struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai; 398 399 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 400 return -ENODEV; 401 else 402 cpu_dai->dma_data = &pxa2xx_ac97_pcm_mic_mono_in; 403 404 return 0; 405 } 406 407 #define PXA2XX_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\ 408 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \ 409 SNDRV_PCM_RATE_48000) 410 411 /* 412 * There is only 1 physical AC97 interface for pxa2xx, but it 413 * has extra fifo's that can be used for aux DACs and ADCs. 414 */ 415 struct snd_soc_dai pxa_ac97_dai[] = { 416 { 417 .name = "pxa2xx-ac97", 418 .id = 0, 419 .type = SND_SOC_DAI_AC97, 420 .probe = pxa2xx_ac97_probe, 421 .remove = pxa2xx_ac97_remove, 422 .suspend = pxa2xx_ac97_suspend, 423 .resume = pxa2xx_ac97_resume, 424 .playback = { 425 .stream_name = "AC97 Playback", 426 .channels_min = 2, 427 .channels_max = 2, 428 .rates = PXA2XX_AC97_RATES, 429 .formats = SNDRV_PCM_FMTBIT_S16_LE,}, 430 .capture = { 431 .stream_name = "AC97 Capture", 432 .channels_min = 2, 433 .channels_max = 2, 434 .rates = PXA2XX_AC97_RATES, 435 .formats = SNDRV_PCM_FMTBIT_S16_LE,}, 436 .ops = { 437 .hw_params = pxa2xx_ac97_hw_params,}, 438 }, 439 { 440 .name = "pxa2xx-ac97-aux", 441 .id = 1, 442 .type = SND_SOC_DAI_AC97, 443 .playback = { 444 .stream_name = "AC97 Aux Playback", 445 .channels_min = 1, 446 .channels_max = 1, 447 .rates = PXA2XX_AC97_RATES, 448 .formats = SNDRV_PCM_FMTBIT_S16_LE,}, 449 .capture = { 450 .stream_name = "AC97 Aux Capture", 451 .channels_min = 1, 452 .channels_max = 1, 453 .rates = PXA2XX_AC97_RATES, 454 .formats = SNDRV_PCM_FMTBIT_S16_LE,}, 455 .ops = { 456 .hw_params = pxa2xx_ac97_hw_aux_params,}, 457 }, 458 { 459 .name = "pxa2xx-ac97-mic", 460 .id = 2, 461 .type = SND_SOC_DAI_AC97, 462 .capture = { 463 .stream_name = "AC97 Mic Capture", 464 .channels_min = 1, 465 .channels_max = 1, 466 .rates = PXA2XX_AC97_RATES, 467 .formats = SNDRV_PCM_FMTBIT_S16_LE,}, 468 .ops = { 469 .hw_params = pxa2xx_ac97_hw_mic_params,}, 470 }, 471 }; 472 473 EXPORT_SYMBOL_GPL(pxa_ac97_dai); 474 EXPORT_SYMBOL_GPL(soc_ac97_ops); 475 476 MODULE_AUTHOR("Nicolas Pitre"); 477 MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip"); 478 MODULE_LICENSE("GPL"); 479