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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 | // SPDX-License-Identifier: GPL-2.0-only /* * Au12x0/Au1550 PSC ALSA ASoC audio support. * * (c) 2007-2008 MSC Vertriebsges.m.b.H., * Manuel Lauss <manuel.lauss@gmail.com> * * Au1xxx-PSC I2S glue. * * NOTE: so far only PSC slave mode (bit- and frameclock) is supported. */ #include <linux/init.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/suspend.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/initval.h> #include <sound/soc.h> #include <asm/mach-au1x00/au1000.h> #include <asm/mach-au1x00/au1xxx_psc.h> #include "psc.h" /* supported I2S DAI hardware formats */ #define AU1XPSC_I2S_DAIFMT \ (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_LEFT_J | \ SND_SOC_DAIFMT_NB_NF) /* supported I2S direction */ #define AU1XPSC_I2S_DIR \ (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE) #define AU1XPSC_I2S_RATES \ SNDRV_PCM_RATE_8000_192000 #define AU1XPSC_I2S_FMTS \ (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE) #define I2SSTAT_BUSY(stype) \ ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SSTAT_TB : PSC_I2SSTAT_RB) #define I2SPCR_START(stype) \ ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SPCR_TS : PSC_I2SPCR_RS) #define I2SPCR_STOP(stype) \ ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SPCR_TP : PSC_I2SPCR_RP) #define I2SPCR_CLRFIFO(stype) \ ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SPCR_TC : PSC_I2SPCR_RC) static int au1xpsc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) { struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(cpu_dai); unsigned long ct; int ret; ret = -EINVAL; ct = pscdata->cfg; ct &= ~(PSC_I2SCFG_XM | PSC_I2SCFG_MLJ); /* left-justified */ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { case SND_SOC_DAIFMT_I2S: ct |= PSC_I2SCFG_XM; /* enable I2S mode */ break; case SND_SOC_DAIFMT_MSB: break; case SND_SOC_DAIFMT_LSB: ct |= PSC_I2SCFG_MLJ; /* LSB (right-) justified */ break; default: goto out; } ct &= ~(PSC_I2SCFG_BI | PSC_I2SCFG_WI); /* IB-IF */ switch (fmt & SND_SOC_DAIFMT_INV_MASK) { case SND_SOC_DAIFMT_NB_NF: ct |= PSC_I2SCFG_BI | PSC_I2SCFG_WI; break; case SND_SOC_DAIFMT_NB_IF: ct |= PSC_I2SCFG_BI; break; case SND_SOC_DAIFMT_IB_NF: ct |= PSC_I2SCFG_WI; break; case SND_SOC_DAIFMT_IB_IF: break; default: goto out; } switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) { case SND_SOC_DAIFMT_BC_FC: /* CODEC provider */ ct |= PSC_I2SCFG_MS; /* PSC I2S consumer mode */ break; case SND_SOC_DAIFMT_BP_FP: /* CODEC consumer */ ct &= ~PSC_I2SCFG_MS; /* PSC I2S provider mode */ break; default: goto out; } pscdata->cfg = ct; ret = 0; out: return ret; } static int au1xpsc_i2s_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai); int cfgbits; unsigned long stat; /* check if the PSC is already streaming data */ stat = __raw_readl(I2S_STAT(pscdata)); if (stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB)) { /* reject parameters not currently set up in hardware */ cfgbits = __raw_readl(I2S_CFG(pscdata)); if ((PSC_I2SCFG_GET_LEN(cfgbits) != params->msbits) || (params_rate(params) != pscdata->rate)) return -EINVAL; } else { /* set sample bitdepth */ pscdata->cfg &= ~(0x1f << 4); pscdata->cfg |= PSC_I2SCFG_SET_LEN(params->msbits); /* remember current rate for other stream */ pscdata->rate = params_rate(params); } return 0; } /* Configure PSC late: on my devel systems the codec is I2S master and * supplies the i2sbitclock __AND__ i2sMclk (!) to the PSC unit. ASoC * uses aggressive PM and switches the codec off when it is not in use * which also means the PSC unit doesn't get any clocks and is therefore * dead. That's why this chunk here gets called from the trigger callback * because I can be reasonably certain the codec is driving the clocks. */ static int au1xpsc_i2s_configure(struct au1xpsc_audio_data *pscdata) { unsigned long tmo; /* bring PSC out of sleep, and configure I2S unit */ __raw_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata)); wmb(); /* drain writebuffer */ tmo = 1000000; while (!(__raw_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_SR) && tmo) tmo--; if (!tmo) goto psc_err; __raw_writel(0, I2S_CFG(pscdata)); wmb(); /* drain writebuffer */ __raw_writel(pscdata->cfg | PSC_I2SCFG_DE_ENABLE, I2S_CFG(pscdata)); wmb(); /* drain writebuffer */ /* wait for I2S controller to become ready */ tmo = 1000000; while (!(__raw_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_DR) && tmo) tmo--; if (tmo) return 0; psc_err: __raw_writel(0, I2S_CFG(pscdata)); __raw_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata)); wmb(); /* drain writebuffer */ return -ETIMEDOUT; } static int au1xpsc_i2s_start(struct au1xpsc_audio_data *pscdata, int stype) { unsigned long tmo, stat; int ret; ret = 0; /* if both TX and RX are idle, configure the PSC */ stat = __raw_readl(I2S_STAT(pscdata)); if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) { ret = au1xpsc_i2s_configure(pscdata); if (ret) goto out; } __raw_writel(I2SPCR_CLRFIFO(stype), I2S_PCR(pscdata)); wmb(); /* drain writebuffer */ __raw_writel(I2SPCR_START(stype), I2S_PCR(pscdata)); wmb(); /* drain writebuffer */ /* wait for start confirmation */ tmo = 1000000; while (!(__raw_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo) tmo--; if (!tmo) { __raw_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata)); wmb(); /* drain writebuffer */ ret = -ETIMEDOUT; } out: return ret; } static int au1xpsc_i2s_stop(struct au1xpsc_audio_data *pscdata, int stype) { unsigned long tmo, stat; __raw_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata)); wmb(); /* drain writebuffer */ /* wait for stop confirmation */ tmo = 1000000; while ((__raw_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo) tmo--; /* if both TX and RX are idle, disable PSC */ stat = __raw_readl(I2S_STAT(pscdata)); if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) { __raw_writel(0, I2S_CFG(pscdata)); wmb(); /* drain writebuffer */ __raw_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata)); wmb(); /* drain writebuffer */ } return 0; } static int au1xpsc_i2s_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai); int ret, stype = substream->stream; switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: ret = au1xpsc_i2s_start(pscdata, stype); break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: ret = au1xpsc_i2s_stop(pscdata, stype); break; default: ret = -EINVAL; } return ret; } static int au1xpsc_i2s_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai); snd_soc_dai_set_dma_data(dai, substream, &pscdata->dmaids[0]); return 0; } static const struct snd_soc_dai_ops au1xpsc_i2s_dai_ops = { .startup = au1xpsc_i2s_startup, .trigger = au1xpsc_i2s_trigger, .hw_params = au1xpsc_i2s_hw_params, .set_fmt = au1xpsc_i2s_set_fmt, }; static const struct snd_soc_dai_driver au1xpsc_i2s_dai_template = { .playback = { .rates = AU1XPSC_I2S_RATES, .formats = AU1XPSC_I2S_FMTS, .channels_min = 2, .channels_max = 8, /* 2 without external help */ }, .capture = { .rates = AU1XPSC_I2S_RATES, .formats = AU1XPSC_I2S_FMTS, .channels_min = 2, .channels_max = 8, /* 2 without external help */ }, .ops = &au1xpsc_i2s_dai_ops, }; static const struct snd_soc_component_driver au1xpsc_i2s_component = { .name = "au1xpsc-i2s", .legacy_dai_naming = 1, }; static int au1xpsc_i2s_drvprobe(struct platform_device *pdev) { struct resource *dmares; unsigned long sel; struct au1xpsc_audio_data *wd; wd = devm_kzalloc(&pdev->dev, sizeof(struct au1xpsc_audio_data), GFP_KERNEL); if (!wd) return -ENOMEM; wd->mmio = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(wd->mmio)) return PTR_ERR(wd->mmio); dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0); if (!dmares) return -EBUSY; wd->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start; dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1); if (!dmares) return -EBUSY; wd->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start; /* preserve PSC clock source set up by platform (dev.platform_data * is already occupied by soc layer) */ sel = __raw_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK; __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); wmb(); /* drain writebuffer */ __raw_writel(PSC_SEL_PS_I2SMODE | sel, PSC_SEL(wd)); __raw_writel(0, I2S_CFG(wd)); wmb(); /* drain writebuffer */ /* preconfigure: set max rx/tx fifo depths */ wd->cfg |= PSC_I2SCFG_RT_FIFO8 | PSC_I2SCFG_TT_FIFO8; /* don't wait for I2S core to become ready now; clocks may not * be running yet; depending on clock input for PSC a wait might * time out. */ /* name the DAI like this device instance ("au1xpsc-i2s.PSCINDEX") */ memcpy(&wd->dai_drv, &au1xpsc_i2s_dai_template, sizeof(struct snd_soc_dai_driver)); wd->dai_drv.name = dev_name(&pdev->dev); platform_set_drvdata(pdev, wd); return devm_snd_soc_register_component(&pdev->dev, &au1xpsc_i2s_component, &wd->dai_drv, 1); } static int au1xpsc_i2s_drvremove(struct platform_device *pdev) { struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev); __raw_writel(0, I2S_CFG(wd)); wmb(); /* drain writebuffer */ __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); wmb(); /* drain writebuffer */ return 0; } #ifdef CONFIG_PM static int au1xpsc_i2s_drvsuspend(struct device *dev) { struct au1xpsc_audio_data *wd = dev_get_drvdata(dev); /* save interesting register and disable PSC */ wd->pm[0] = __raw_readl(PSC_SEL(wd)); __raw_writel(0, I2S_CFG(wd)); wmb(); /* drain writebuffer */ __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); wmb(); /* drain writebuffer */ return 0; } static int au1xpsc_i2s_drvresume(struct device *dev) { struct au1xpsc_audio_data *wd = dev_get_drvdata(dev); /* select I2S mode and PSC clock */ __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); wmb(); /* drain writebuffer */ __raw_writel(0, PSC_SEL(wd)); wmb(); /* drain writebuffer */ __raw_writel(wd->pm[0], PSC_SEL(wd)); wmb(); /* drain writebuffer */ return 0; } static const struct dev_pm_ops au1xpsci2s_pmops = { .suspend = au1xpsc_i2s_drvsuspend, .resume = au1xpsc_i2s_drvresume, }; #define AU1XPSCI2S_PMOPS &au1xpsci2s_pmops #else #define AU1XPSCI2S_PMOPS NULL #endif static struct platform_driver au1xpsc_i2s_driver = { .driver = { .name = "au1xpsc_i2s", .pm = AU1XPSCI2S_PMOPS, }, .probe = au1xpsc_i2s_drvprobe, .remove = au1xpsc_i2s_drvremove, }; module_platform_driver(au1xpsc_i2s_driver); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Au12x0/Au1550 PSC I2S ALSA ASoC audio driver"); MODULE_AUTHOR("Manuel Lauss"); |