1 /* 2 * Au12x0/Au1550 PSC ALSA ASoC audio support. 3 * 4 * (c) 2007-2008 MSC Vertriebsges.m.b.H., 5 * Manuel Lauss <manuel.lauss@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 * Au1xxx-PSC I2S glue. 12 * 13 * NOTE: so far only PSC slave mode (bit- and frameclock) is supported. 14 */ 15 16 #include <linux/init.h> 17 #include <linux/module.h> 18 #include <linux/slab.h> 19 #include <linux/suspend.h> 20 #include <sound/core.h> 21 #include <sound/pcm.h> 22 #include <sound/initval.h> 23 #include <sound/soc.h> 24 #include <asm/mach-au1x00/au1000.h> 25 #include <asm/mach-au1x00/au1xxx_psc.h> 26 27 #include "psc.h" 28 29 /* supported I2S DAI hardware formats */ 30 #define AU1XPSC_I2S_DAIFMT \ 31 (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_LEFT_J | \ 32 SND_SOC_DAIFMT_NB_NF) 33 34 /* supported I2S direction */ 35 #define AU1XPSC_I2S_DIR \ 36 (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE) 37 38 #define AU1XPSC_I2S_RATES \ 39 SNDRV_PCM_RATE_8000_192000 40 41 #define AU1XPSC_I2S_FMTS \ 42 (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE) 43 44 #define I2SSTAT_BUSY(stype) \ 45 ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SSTAT_TB : PSC_I2SSTAT_RB) 46 #define I2SPCR_START(stype) \ 47 ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SPCR_TS : PSC_I2SPCR_RS) 48 #define I2SPCR_STOP(stype) \ 49 ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SPCR_TP : PSC_I2SPCR_RP) 50 #define I2SPCR_CLRFIFO(stype) \ 51 ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SPCR_TC : PSC_I2SPCR_RC) 52 53 54 static int au1xpsc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, 55 unsigned int fmt) 56 { 57 struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(cpu_dai); 58 unsigned long ct; 59 int ret; 60 61 ret = -EINVAL; 62 63 ct = pscdata->cfg; 64 65 ct &= ~(PSC_I2SCFG_XM | PSC_I2SCFG_MLJ); /* left-justified */ 66 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 67 case SND_SOC_DAIFMT_I2S: 68 ct |= PSC_I2SCFG_XM; /* enable I2S mode */ 69 break; 70 case SND_SOC_DAIFMT_MSB: 71 break; 72 case SND_SOC_DAIFMT_LSB: 73 ct |= PSC_I2SCFG_MLJ; /* LSB (right-) justified */ 74 break; 75 default: 76 goto out; 77 } 78 79 ct &= ~(PSC_I2SCFG_BI | PSC_I2SCFG_WI); /* IB-IF */ 80 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 81 case SND_SOC_DAIFMT_NB_NF: 82 ct |= PSC_I2SCFG_BI | PSC_I2SCFG_WI; 83 break; 84 case SND_SOC_DAIFMT_NB_IF: 85 ct |= PSC_I2SCFG_BI; 86 break; 87 case SND_SOC_DAIFMT_IB_NF: 88 ct |= PSC_I2SCFG_WI; 89 break; 90 case SND_SOC_DAIFMT_IB_IF: 91 break; 92 default: 93 goto out; 94 } 95 96 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 97 case SND_SOC_DAIFMT_CBM_CFM: /* CODEC master */ 98 ct |= PSC_I2SCFG_MS; /* PSC I2S slave mode */ 99 break; 100 case SND_SOC_DAIFMT_CBS_CFS: /* CODEC slave */ 101 ct &= ~PSC_I2SCFG_MS; /* PSC I2S Master mode */ 102 break; 103 default: 104 goto out; 105 } 106 107 pscdata->cfg = ct; 108 ret = 0; 109 out: 110 return ret; 111 } 112 113 static int au1xpsc_i2s_hw_params(struct snd_pcm_substream *substream, 114 struct snd_pcm_hw_params *params, 115 struct snd_soc_dai *dai) 116 { 117 struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai); 118 119 int cfgbits; 120 unsigned long stat; 121 122 /* check if the PSC is already streaming data */ 123 stat = __raw_readl(I2S_STAT(pscdata)); 124 if (stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB)) { 125 /* reject parameters not currently set up in hardware */ 126 cfgbits = __raw_readl(I2S_CFG(pscdata)); 127 if ((PSC_I2SCFG_GET_LEN(cfgbits) != params->msbits) || 128 (params_rate(params) != pscdata->rate)) 129 return -EINVAL; 130 } else { 131 /* set sample bitdepth */ 132 pscdata->cfg &= ~(0x1f << 4); 133 pscdata->cfg |= PSC_I2SCFG_SET_LEN(params->msbits); 134 /* remember current rate for other stream */ 135 pscdata->rate = params_rate(params); 136 } 137 return 0; 138 } 139 140 /* Configure PSC late: on my devel systems the codec is I2S master and 141 * supplies the i2sbitclock __AND__ i2sMclk (!) to the PSC unit. ASoC 142 * uses aggressive PM and switches the codec off when it is not in use 143 * which also means the PSC unit doesn't get any clocks and is therefore 144 * dead. That's why this chunk here gets called from the trigger callback 145 * because I can be reasonably certain the codec is driving the clocks. 146 */ 147 static int au1xpsc_i2s_configure(struct au1xpsc_audio_data *pscdata) 148 { 149 unsigned long tmo; 150 151 /* bring PSC out of sleep, and configure I2S unit */ 152 __raw_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata)); 153 wmb(); /* drain writebuffer */ 154 155 tmo = 1000000; 156 while (!(__raw_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_SR) && tmo) 157 tmo--; 158 159 if (!tmo) 160 goto psc_err; 161 162 __raw_writel(0, I2S_CFG(pscdata)); 163 wmb(); /* drain writebuffer */ 164 __raw_writel(pscdata->cfg | PSC_I2SCFG_DE_ENABLE, I2S_CFG(pscdata)); 165 wmb(); /* drain writebuffer */ 166 167 /* wait for I2S controller to become ready */ 168 tmo = 1000000; 169 while (!(__raw_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_DR) && tmo) 170 tmo--; 171 172 if (tmo) 173 return 0; 174 175 psc_err: 176 __raw_writel(0, I2S_CFG(pscdata)); 177 __raw_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata)); 178 wmb(); /* drain writebuffer */ 179 return -ETIMEDOUT; 180 } 181 182 static int au1xpsc_i2s_start(struct au1xpsc_audio_data *pscdata, int stype) 183 { 184 unsigned long tmo, stat; 185 int ret; 186 187 ret = 0; 188 189 /* if both TX and RX are idle, configure the PSC */ 190 stat = __raw_readl(I2S_STAT(pscdata)); 191 if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) { 192 ret = au1xpsc_i2s_configure(pscdata); 193 if (ret) 194 goto out; 195 } 196 197 __raw_writel(I2SPCR_CLRFIFO(stype), I2S_PCR(pscdata)); 198 wmb(); /* drain writebuffer */ 199 __raw_writel(I2SPCR_START(stype), I2S_PCR(pscdata)); 200 wmb(); /* drain writebuffer */ 201 202 /* wait for start confirmation */ 203 tmo = 1000000; 204 while (!(__raw_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo) 205 tmo--; 206 207 if (!tmo) { 208 __raw_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata)); 209 wmb(); /* drain writebuffer */ 210 ret = -ETIMEDOUT; 211 } 212 out: 213 return ret; 214 } 215 216 static int au1xpsc_i2s_stop(struct au1xpsc_audio_data *pscdata, int stype) 217 { 218 unsigned long tmo, stat; 219 220 __raw_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata)); 221 wmb(); /* drain writebuffer */ 222 223 /* wait for stop confirmation */ 224 tmo = 1000000; 225 while ((__raw_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo) 226 tmo--; 227 228 /* if both TX and RX are idle, disable PSC */ 229 stat = __raw_readl(I2S_STAT(pscdata)); 230 if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) { 231 __raw_writel(0, I2S_CFG(pscdata)); 232 wmb(); /* drain writebuffer */ 233 __raw_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata)); 234 wmb(); /* drain writebuffer */ 235 } 236 return 0; 237 } 238 239 static int au1xpsc_i2s_trigger(struct snd_pcm_substream *substream, int cmd, 240 struct snd_soc_dai *dai) 241 { 242 struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai); 243 int ret, stype = substream->stream; 244 245 switch (cmd) { 246 case SNDRV_PCM_TRIGGER_START: 247 case SNDRV_PCM_TRIGGER_RESUME: 248 ret = au1xpsc_i2s_start(pscdata, stype); 249 break; 250 case SNDRV_PCM_TRIGGER_STOP: 251 case SNDRV_PCM_TRIGGER_SUSPEND: 252 ret = au1xpsc_i2s_stop(pscdata, stype); 253 break; 254 default: 255 ret = -EINVAL; 256 } 257 return ret; 258 } 259 260 static int au1xpsc_i2s_startup(struct snd_pcm_substream *substream, 261 struct snd_soc_dai *dai) 262 { 263 struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai); 264 snd_soc_dai_set_dma_data(dai, substream, &pscdata->dmaids[0]); 265 return 0; 266 } 267 268 static const struct snd_soc_dai_ops au1xpsc_i2s_dai_ops = { 269 .startup = au1xpsc_i2s_startup, 270 .trigger = au1xpsc_i2s_trigger, 271 .hw_params = au1xpsc_i2s_hw_params, 272 .set_fmt = au1xpsc_i2s_set_fmt, 273 }; 274 275 static const struct snd_soc_dai_driver au1xpsc_i2s_dai_template = { 276 .playback = { 277 .rates = AU1XPSC_I2S_RATES, 278 .formats = AU1XPSC_I2S_FMTS, 279 .channels_min = 2, 280 .channels_max = 8, /* 2 without external help */ 281 }, 282 .capture = { 283 .rates = AU1XPSC_I2S_RATES, 284 .formats = AU1XPSC_I2S_FMTS, 285 .channels_min = 2, 286 .channels_max = 8, /* 2 without external help */ 287 }, 288 .ops = &au1xpsc_i2s_dai_ops, 289 }; 290 291 static const struct snd_soc_component_driver au1xpsc_i2s_component = { 292 .name = "au1xpsc-i2s", 293 }; 294 295 static int au1xpsc_i2s_drvprobe(struct platform_device *pdev) 296 { 297 struct resource *iores, *dmares; 298 unsigned long sel; 299 int ret; 300 struct au1xpsc_audio_data *wd; 301 302 wd = devm_kzalloc(&pdev->dev, sizeof(struct au1xpsc_audio_data), 303 GFP_KERNEL); 304 if (!wd) 305 return -ENOMEM; 306 307 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); 308 if (!iores) 309 return -ENODEV; 310 311 ret = -EBUSY; 312 if (!devm_request_mem_region(&pdev->dev, iores->start, 313 resource_size(iores), 314 pdev->name)) 315 return -EBUSY; 316 317 wd->mmio = devm_ioremap(&pdev->dev, iores->start, 318 resource_size(iores)); 319 if (!wd->mmio) 320 return -EBUSY; 321 322 dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0); 323 if (!dmares) 324 return -EBUSY; 325 wd->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start; 326 327 dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1); 328 if (!dmares) 329 return -EBUSY; 330 wd->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start; 331 332 /* preserve PSC clock source set up by platform (dev.platform_data 333 * is already occupied by soc layer) 334 */ 335 sel = __raw_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK; 336 __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); 337 wmb(); /* drain writebuffer */ 338 __raw_writel(PSC_SEL_PS_I2SMODE | sel, PSC_SEL(wd)); 339 __raw_writel(0, I2S_CFG(wd)); 340 wmb(); /* drain writebuffer */ 341 342 /* preconfigure: set max rx/tx fifo depths */ 343 wd->cfg |= PSC_I2SCFG_RT_FIFO8 | PSC_I2SCFG_TT_FIFO8; 344 345 /* don't wait for I2S core to become ready now; clocks may not 346 * be running yet; depending on clock input for PSC a wait might 347 * time out. 348 */ 349 350 /* name the DAI like this device instance ("au1xpsc-i2s.PSCINDEX") */ 351 memcpy(&wd->dai_drv, &au1xpsc_i2s_dai_template, 352 sizeof(struct snd_soc_dai_driver)); 353 wd->dai_drv.name = dev_name(&pdev->dev); 354 355 platform_set_drvdata(pdev, wd); 356 357 return snd_soc_register_component(&pdev->dev, &au1xpsc_i2s_component, 358 &wd->dai_drv, 1); 359 } 360 361 static int au1xpsc_i2s_drvremove(struct platform_device *pdev) 362 { 363 struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev); 364 365 snd_soc_unregister_component(&pdev->dev); 366 367 __raw_writel(0, I2S_CFG(wd)); 368 wmb(); /* drain writebuffer */ 369 __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); 370 wmb(); /* drain writebuffer */ 371 372 return 0; 373 } 374 375 #ifdef CONFIG_PM 376 static int au1xpsc_i2s_drvsuspend(struct device *dev) 377 { 378 struct au1xpsc_audio_data *wd = dev_get_drvdata(dev); 379 380 /* save interesting register and disable PSC */ 381 wd->pm[0] = __raw_readl(PSC_SEL(wd)); 382 383 __raw_writel(0, I2S_CFG(wd)); 384 wmb(); /* drain writebuffer */ 385 __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); 386 wmb(); /* drain writebuffer */ 387 388 return 0; 389 } 390 391 static int au1xpsc_i2s_drvresume(struct device *dev) 392 { 393 struct au1xpsc_audio_data *wd = dev_get_drvdata(dev); 394 395 /* select I2S mode and PSC clock */ 396 __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); 397 wmb(); /* drain writebuffer */ 398 __raw_writel(0, PSC_SEL(wd)); 399 wmb(); /* drain writebuffer */ 400 __raw_writel(wd->pm[0], PSC_SEL(wd)); 401 wmb(); /* drain writebuffer */ 402 403 return 0; 404 } 405 406 static struct dev_pm_ops au1xpsci2s_pmops = { 407 .suspend = au1xpsc_i2s_drvsuspend, 408 .resume = au1xpsc_i2s_drvresume, 409 }; 410 411 #define AU1XPSCI2S_PMOPS &au1xpsci2s_pmops 412 413 #else 414 415 #define AU1XPSCI2S_PMOPS NULL 416 417 #endif 418 419 static struct platform_driver au1xpsc_i2s_driver = { 420 .driver = { 421 .name = "au1xpsc_i2s", 422 .pm = AU1XPSCI2S_PMOPS, 423 }, 424 .probe = au1xpsc_i2s_drvprobe, 425 .remove = au1xpsc_i2s_drvremove, 426 }; 427 428 module_platform_driver(au1xpsc_i2s_driver); 429 430 MODULE_LICENSE("GPL"); 431 MODULE_DESCRIPTION("Au12x0/Au1550 PSC I2S ALSA ASoC audio driver"); 432 MODULE_AUTHOR("Manuel Lauss"); 433