1 /* 2 * linux/sound/soc/pxa/mmp-sspa.c 3 * Base on pxa2xx-ssp.c 4 * 5 * Copyright (C) 2011 Marvell International Ltd. 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 as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 * 21 */ 22 #include <linux/init.h> 23 #include <linux/module.h> 24 #include <linux/platform_device.h> 25 #include <linux/delay.h> 26 #include <linux/clk.h> 27 #include <linux/slab.h> 28 #include <linux/pxa2xx_ssp.h> 29 #include <linux/io.h> 30 #include <linux/dmaengine.h> 31 32 #include <sound/core.h> 33 #include <sound/pcm.h> 34 #include <sound/initval.h> 35 #include <sound/pcm_params.h> 36 #include <sound/soc.h> 37 #include <sound/pxa2xx-lib.h> 38 #include <sound/dmaengine_pcm.h> 39 #include "mmp-sspa.h" 40 41 /* 42 * SSPA audio private data 43 */ 44 struct sspa_priv { 45 struct ssp_device *sspa; 46 struct snd_dmaengine_dai_dma_data *dma_params; 47 struct clk *audio_clk; 48 struct clk *sysclk; 49 int dai_fmt; 50 int running_cnt; 51 }; 52 53 static void mmp_sspa_write_reg(struct ssp_device *sspa, u32 reg, u32 val) 54 { 55 __raw_writel(val, sspa->mmio_base + reg); 56 } 57 58 static u32 mmp_sspa_read_reg(struct ssp_device *sspa, u32 reg) 59 { 60 return __raw_readl(sspa->mmio_base + reg); 61 } 62 63 static void mmp_sspa_tx_enable(struct ssp_device *sspa) 64 { 65 unsigned int sspa_sp; 66 67 sspa_sp = mmp_sspa_read_reg(sspa, SSPA_TXSP); 68 sspa_sp |= SSPA_SP_S_EN; 69 sspa_sp |= SSPA_SP_WEN; 70 mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp); 71 } 72 73 static void mmp_sspa_tx_disable(struct ssp_device *sspa) 74 { 75 unsigned int sspa_sp; 76 77 sspa_sp = mmp_sspa_read_reg(sspa, SSPA_TXSP); 78 sspa_sp &= ~SSPA_SP_S_EN; 79 sspa_sp |= SSPA_SP_WEN; 80 mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp); 81 } 82 83 static void mmp_sspa_rx_enable(struct ssp_device *sspa) 84 { 85 unsigned int sspa_sp; 86 87 sspa_sp = mmp_sspa_read_reg(sspa, SSPA_RXSP); 88 sspa_sp |= SSPA_SP_S_EN; 89 sspa_sp |= SSPA_SP_WEN; 90 mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp); 91 } 92 93 static void mmp_sspa_rx_disable(struct ssp_device *sspa) 94 { 95 unsigned int sspa_sp; 96 97 sspa_sp = mmp_sspa_read_reg(sspa, SSPA_RXSP); 98 sspa_sp &= ~SSPA_SP_S_EN; 99 sspa_sp |= SSPA_SP_WEN; 100 mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp); 101 } 102 103 static int mmp_sspa_startup(struct snd_pcm_substream *substream, 104 struct snd_soc_dai *dai) 105 { 106 struct sspa_priv *priv = snd_soc_dai_get_drvdata(dai); 107 108 clk_enable(priv->sysclk); 109 clk_enable(priv->sspa->clk); 110 111 return 0; 112 } 113 114 static void mmp_sspa_shutdown(struct snd_pcm_substream *substream, 115 struct snd_soc_dai *dai) 116 { 117 struct sspa_priv *priv = snd_soc_dai_get_drvdata(dai); 118 119 clk_disable(priv->sspa->clk); 120 clk_disable(priv->sysclk); 121 122 return; 123 } 124 125 /* 126 * Set the SSP ports SYSCLK. 127 */ 128 static int mmp_sspa_set_dai_sysclk(struct snd_soc_dai *cpu_dai, 129 int clk_id, unsigned int freq, int dir) 130 { 131 struct sspa_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 132 int ret = 0; 133 134 switch (clk_id) { 135 case MMP_SSPA_CLK_AUDIO: 136 ret = clk_set_rate(priv->audio_clk, freq); 137 if (ret) 138 return ret; 139 break; 140 case MMP_SSPA_CLK_PLL: 141 case MMP_SSPA_CLK_VCXO: 142 /* not support yet */ 143 return -EINVAL; 144 default: 145 return -EINVAL; 146 } 147 148 return 0; 149 } 150 151 static int mmp_sspa_set_dai_pll(struct snd_soc_dai *cpu_dai, int pll_id, 152 int source, unsigned int freq_in, 153 unsigned int freq_out) 154 { 155 struct sspa_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 156 int ret = 0; 157 158 switch (pll_id) { 159 case MMP_SYSCLK: 160 ret = clk_set_rate(priv->sysclk, freq_out); 161 if (ret) 162 return ret; 163 break; 164 case MMP_SSPA_CLK: 165 ret = clk_set_rate(priv->sspa->clk, freq_out); 166 if (ret) 167 return ret; 168 break; 169 default: 170 return -ENODEV; 171 } 172 173 return 0; 174 } 175 176 /* 177 * Set up the sspa dai format. The sspa port must be inactive 178 * before calling this function as the physical 179 * interface format is changed. 180 */ 181 static int mmp_sspa_set_dai_fmt(struct snd_soc_dai *cpu_dai, 182 unsigned int fmt) 183 { 184 struct sspa_priv *sspa_priv = snd_soc_dai_get_drvdata(cpu_dai); 185 struct ssp_device *sspa = sspa_priv->sspa; 186 u32 sspa_sp, sspa_ctrl; 187 188 /* check if we need to change anything at all */ 189 if (sspa_priv->dai_fmt == fmt) 190 return 0; 191 192 /* we can only change the settings if the port is not in use */ 193 if ((mmp_sspa_read_reg(sspa, SSPA_TXSP) & SSPA_SP_S_EN) || 194 (mmp_sspa_read_reg(sspa, SSPA_RXSP) & SSPA_SP_S_EN)) { 195 dev_err(&sspa->pdev->dev, 196 "can't change hardware dai format: stream is in use\n"); 197 return -EINVAL; 198 } 199 200 /* reset port settings */ 201 sspa_sp = SSPA_SP_WEN | SSPA_SP_S_RST | SSPA_SP_FFLUSH; 202 sspa_ctrl = 0; 203 204 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 205 case SND_SOC_DAIFMT_CBS_CFS: 206 sspa_sp |= SSPA_SP_MSL; 207 break; 208 case SND_SOC_DAIFMT_CBM_CFM: 209 break; 210 default: 211 return -EINVAL; 212 } 213 214 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 215 case SND_SOC_DAIFMT_NB_NF: 216 sspa_sp |= SSPA_SP_FSP; 217 break; 218 default: 219 return -EINVAL; 220 } 221 222 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 223 case SND_SOC_DAIFMT_I2S: 224 sspa_sp |= SSPA_TXSP_FPER(63); 225 sspa_sp |= SSPA_SP_FWID(31); 226 sspa_ctrl |= SSPA_CTL_XDATDLY(1); 227 break; 228 default: 229 return -EINVAL; 230 } 231 232 mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp); 233 mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp); 234 235 sspa_sp &= ~(SSPA_SP_S_RST | SSPA_SP_FFLUSH); 236 mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp); 237 mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp); 238 239 /* 240 * FIXME: hw issue, for the tx serial port, 241 * can not config the master/slave mode; 242 * so must clean this bit. 243 * The master/slave mode has been set in the 244 * rx port. 245 */ 246 sspa_sp &= ~SSPA_SP_MSL; 247 mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp); 248 249 mmp_sspa_write_reg(sspa, SSPA_TXCTL, sspa_ctrl); 250 mmp_sspa_write_reg(sspa, SSPA_RXCTL, sspa_ctrl); 251 252 /* Since we are configuring the timings for the format by hand 253 * we have to defer some things until hw_params() where we 254 * know parameters like the sample size. 255 */ 256 sspa_priv->dai_fmt = fmt; 257 return 0; 258 } 259 260 /* 261 * Set the SSPA audio DMA parameters and sample size. 262 * Can be called multiple times by oss emulation. 263 */ 264 static int mmp_sspa_hw_params(struct snd_pcm_substream *substream, 265 struct snd_pcm_hw_params *params, 266 struct snd_soc_dai *dai) 267 { 268 struct snd_soc_pcm_runtime *rtd = substream->private_data; 269 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 270 struct sspa_priv *sspa_priv = snd_soc_dai_get_drvdata(dai); 271 struct ssp_device *sspa = sspa_priv->sspa; 272 struct snd_dmaengine_dai_dma_data *dma_params; 273 u32 sspa_ctrl; 274 275 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 276 sspa_ctrl = mmp_sspa_read_reg(sspa, SSPA_TXCTL); 277 else 278 sspa_ctrl = mmp_sspa_read_reg(sspa, SSPA_RXCTL); 279 280 sspa_ctrl &= ~SSPA_CTL_XFRLEN1_MASK; 281 sspa_ctrl |= SSPA_CTL_XFRLEN1(params_channels(params) - 1); 282 sspa_ctrl &= ~SSPA_CTL_XWDLEN1_MASK; 283 sspa_ctrl |= SSPA_CTL_XWDLEN1(SSPA_CTL_32_BITS); 284 sspa_ctrl &= ~SSPA_CTL_XSSZ1_MASK; 285 286 switch (params_format(params)) { 287 case SNDRV_PCM_FORMAT_S8: 288 sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_8_BITS); 289 break; 290 case SNDRV_PCM_FORMAT_S16_LE: 291 sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_16_BITS); 292 break; 293 case SNDRV_PCM_FORMAT_S20_3LE: 294 sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_20_BITS); 295 break; 296 case SNDRV_PCM_FORMAT_S24_3LE: 297 sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_24_BITS); 298 break; 299 case SNDRV_PCM_FORMAT_S32_LE: 300 sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_32_BITS); 301 break; 302 default: 303 return -EINVAL; 304 } 305 306 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 307 mmp_sspa_write_reg(sspa, SSPA_TXCTL, sspa_ctrl); 308 mmp_sspa_write_reg(sspa, SSPA_TXFIFO_LL, 0x1); 309 } else { 310 mmp_sspa_write_reg(sspa, SSPA_RXCTL, sspa_ctrl); 311 mmp_sspa_write_reg(sspa, SSPA_RXFIFO_UL, 0x0); 312 } 313 314 dma_params = &sspa_priv->dma_params[substream->stream]; 315 dma_params->addr = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 316 (sspa->phys_base + SSPA_TXD) : 317 (sspa->phys_base + SSPA_RXD); 318 snd_soc_dai_set_dma_data(cpu_dai, substream, dma_params); 319 return 0; 320 } 321 322 static int mmp_sspa_trigger(struct snd_pcm_substream *substream, int cmd, 323 struct snd_soc_dai *dai) 324 { 325 struct sspa_priv *sspa_priv = snd_soc_dai_get_drvdata(dai); 326 struct ssp_device *sspa = sspa_priv->sspa; 327 int ret = 0; 328 329 switch (cmd) { 330 case SNDRV_PCM_TRIGGER_START: 331 case SNDRV_PCM_TRIGGER_RESUME: 332 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 333 /* 334 * whatever playback or capture, must enable rx. 335 * this is a hw issue, so need check if rx has been 336 * enabled or not; if has been enabled by another 337 * stream, do not enable again. 338 */ 339 if (!sspa_priv->running_cnt) 340 mmp_sspa_rx_enable(sspa); 341 342 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 343 mmp_sspa_tx_enable(sspa); 344 345 sspa_priv->running_cnt++; 346 break; 347 348 case SNDRV_PCM_TRIGGER_STOP: 349 case SNDRV_PCM_TRIGGER_SUSPEND: 350 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 351 sspa_priv->running_cnt--; 352 353 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 354 mmp_sspa_tx_disable(sspa); 355 356 /* have no capture stream, disable rx port */ 357 if (!sspa_priv->running_cnt) 358 mmp_sspa_rx_disable(sspa); 359 break; 360 361 default: 362 ret = -EINVAL; 363 } 364 365 return ret; 366 } 367 368 static int mmp_sspa_probe(struct snd_soc_dai *dai) 369 { 370 struct sspa_priv *priv = dev_get_drvdata(dai->dev); 371 372 snd_soc_dai_set_drvdata(dai, priv); 373 return 0; 374 375 } 376 377 #define MMP_SSPA_RATES SNDRV_PCM_RATE_8000_192000 378 #define MMP_SSPA_FORMATS (SNDRV_PCM_FMTBIT_S8 | \ 379 SNDRV_PCM_FMTBIT_S16_LE | \ 380 SNDRV_PCM_FMTBIT_S24_LE | \ 381 SNDRV_PCM_FMTBIT_S24_LE | \ 382 SNDRV_PCM_FMTBIT_S32_LE) 383 384 static struct snd_soc_dai_ops mmp_sspa_dai_ops = { 385 .startup = mmp_sspa_startup, 386 .shutdown = mmp_sspa_shutdown, 387 .trigger = mmp_sspa_trigger, 388 .hw_params = mmp_sspa_hw_params, 389 .set_sysclk = mmp_sspa_set_dai_sysclk, 390 .set_pll = mmp_sspa_set_dai_pll, 391 .set_fmt = mmp_sspa_set_dai_fmt, 392 }; 393 394 static struct snd_soc_dai_driver mmp_sspa_dai = { 395 .probe = mmp_sspa_probe, 396 .playback = { 397 .channels_min = 1, 398 .channels_max = 128, 399 .rates = MMP_SSPA_RATES, 400 .formats = MMP_SSPA_FORMATS, 401 }, 402 .capture = { 403 .channels_min = 1, 404 .channels_max = 2, 405 .rates = MMP_SSPA_RATES, 406 .formats = MMP_SSPA_FORMATS, 407 }, 408 .ops = &mmp_sspa_dai_ops, 409 }; 410 411 static const struct snd_soc_component_driver mmp_sspa_component = { 412 .name = "mmp-sspa", 413 }; 414 415 static int asoc_mmp_sspa_probe(struct platform_device *pdev) 416 { 417 struct sspa_priv *priv; 418 struct resource *res; 419 420 priv = devm_kzalloc(&pdev->dev, 421 sizeof(struct sspa_priv), GFP_KERNEL); 422 if (!priv) 423 return -ENOMEM; 424 425 priv->sspa = devm_kzalloc(&pdev->dev, 426 sizeof(struct ssp_device), GFP_KERNEL); 427 if (priv->sspa == NULL) 428 return -ENOMEM; 429 430 priv->dma_params = devm_kzalloc(&pdev->dev, 431 2 * sizeof(struct snd_dmaengine_dai_dma_data), 432 GFP_KERNEL); 433 if (priv->dma_params == NULL) 434 return -ENOMEM; 435 436 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 437 priv->sspa->mmio_base = devm_ioremap_resource(&pdev->dev, res); 438 if (IS_ERR(priv->sspa->mmio_base)) 439 return PTR_ERR(priv->sspa->mmio_base); 440 441 priv->sspa->clk = devm_clk_get(&pdev->dev, NULL); 442 if (IS_ERR(priv->sspa->clk)) 443 return PTR_ERR(priv->sspa->clk); 444 445 priv->audio_clk = clk_get(NULL, "mmp-audio"); 446 if (IS_ERR(priv->audio_clk)) 447 return PTR_ERR(priv->audio_clk); 448 449 priv->sysclk = clk_get(NULL, "mmp-sysclk"); 450 if (IS_ERR(priv->sysclk)) { 451 clk_put(priv->audio_clk); 452 return PTR_ERR(priv->sysclk); 453 } 454 clk_enable(priv->audio_clk); 455 priv->dai_fmt = (unsigned int) -1; 456 platform_set_drvdata(pdev, priv); 457 458 return devm_snd_soc_register_component(&pdev->dev, &mmp_sspa_component, 459 &mmp_sspa_dai, 1); 460 } 461 462 static int asoc_mmp_sspa_remove(struct platform_device *pdev) 463 { 464 struct sspa_priv *priv = platform_get_drvdata(pdev); 465 466 clk_disable(priv->audio_clk); 467 clk_put(priv->audio_clk); 468 clk_put(priv->sysclk); 469 return 0; 470 } 471 472 static struct platform_driver asoc_mmp_sspa_driver = { 473 .driver = { 474 .name = "mmp-sspa-dai", 475 }, 476 .probe = asoc_mmp_sspa_probe, 477 .remove = asoc_mmp_sspa_remove, 478 }; 479 480 module_platform_driver(asoc_mmp_sspa_driver); 481 482 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>"); 483 MODULE_DESCRIPTION("MMP SSPA SoC Interface"); 484 MODULE_LICENSE("GPL"); 485 MODULE_ALIAS("platform:mmp-sspa-dai"); 486