1 /* 2 * ALSA SoC SPDIF Out Audio Layer for spear processors 3 * 4 * Copyright (C) 2012 ST Microelectronics 5 * Vipin Kumar <vipin.kumar@st.com> 6 * 7 * This file is licensed under the terms of the GNU General Public 8 * License version 2. This program is licensed "as is" without any 9 * warranty of any kind, whether express or implied. 10 */ 11 12 #include <linux/clk.h> 13 #include <linux/delay.h> 14 #include <linux/device.h> 15 #include <linux/kernel.h> 16 #include <linux/init.h> 17 #include <linux/io.h> 18 #include <linux/ioport.h> 19 #include <linux/module.h> 20 #include <linux/platform_device.h> 21 #include <sound/soc.h> 22 #include <sound/spear_dma.h> 23 #include <sound/spear_spdif.h> 24 #include "spdif_out_regs.h" 25 26 struct spdif_out_params { 27 u32 rate; 28 u32 core_freq; 29 u32 mute; 30 }; 31 32 struct spdif_out_dev { 33 struct clk *clk; 34 struct spear_dma_data dma_params; 35 struct spdif_out_params saved_params; 36 u32 running; 37 void __iomem *io_base; 38 }; 39 40 static void spdif_out_configure(struct spdif_out_dev *host) 41 { 42 writel(SPDIF_OUT_RESET, host->io_base + SPDIF_OUT_SOFT_RST); 43 mdelay(1); 44 writel(readl(host->io_base + SPDIF_OUT_SOFT_RST) & ~SPDIF_OUT_RESET, 45 host->io_base + SPDIF_OUT_SOFT_RST); 46 47 writel(SPDIF_OUT_FDMA_TRIG_16 | SPDIF_OUT_MEMFMT_16_16 | 48 SPDIF_OUT_VALID_HW | SPDIF_OUT_USER_HW | 49 SPDIF_OUT_CHNLSTA_HW | SPDIF_OUT_PARITY_HW, 50 host->io_base + SPDIF_OUT_CFG); 51 52 writel(0x7F, host->io_base + SPDIF_OUT_INT_STA_CLR); 53 writel(0x7F, host->io_base + SPDIF_OUT_INT_EN_CLR); 54 } 55 56 static int spdif_out_startup(struct snd_pcm_substream *substream, 57 struct snd_soc_dai *cpu_dai) 58 { 59 struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai); 60 int ret; 61 62 if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) 63 return -EINVAL; 64 65 snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)&host->dma_params); 66 67 ret = clk_enable(host->clk); 68 if (ret) 69 return ret; 70 71 host->running = true; 72 spdif_out_configure(host); 73 74 return 0; 75 } 76 77 static void spdif_out_shutdown(struct snd_pcm_substream *substream, 78 struct snd_soc_dai *dai) 79 { 80 struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai); 81 82 if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) 83 return; 84 85 clk_disable(host->clk); 86 host->running = false; 87 snd_soc_dai_set_dma_data(dai, substream, NULL); 88 } 89 90 static void spdif_out_clock(struct spdif_out_dev *host, u32 core_freq, 91 u32 rate) 92 { 93 u32 divider, ctrl; 94 95 clk_set_rate(host->clk, core_freq); 96 divider = DIV_ROUND_CLOSEST(clk_get_rate(host->clk), (rate * 128)); 97 98 ctrl = readl(host->io_base + SPDIF_OUT_CTRL); 99 ctrl &= ~SPDIF_DIVIDER_MASK; 100 ctrl |= (divider << SPDIF_DIVIDER_SHIFT) & SPDIF_DIVIDER_MASK; 101 writel(ctrl, host->io_base + SPDIF_OUT_CTRL); 102 } 103 104 static int spdif_out_hw_params(struct snd_pcm_substream *substream, 105 struct snd_pcm_hw_params *params, 106 struct snd_soc_dai *dai) 107 { 108 struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai); 109 u32 rate, core_freq; 110 111 if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) 112 return -EINVAL; 113 114 rate = params_rate(params); 115 116 switch (rate) { 117 case 8000: 118 case 16000: 119 case 32000: 120 case 64000: 121 /* 122 * The clock is multiplied by 10 to bring it to feasible range 123 * of frequencies for sscg 124 */ 125 core_freq = 64000 * 128 * 10; /* 81.92 MHz */ 126 break; 127 case 5512: 128 case 11025: 129 case 22050: 130 case 44100: 131 case 88200: 132 case 176400: 133 core_freq = 176400 * 128; /* 22.5792 MHz */ 134 break; 135 case 48000: 136 case 96000: 137 case 192000: 138 default: 139 core_freq = 192000 * 128; /* 24.576 MHz */ 140 break; 141 } 142 143 spdif_out_clock(host, core_freq, rate); 144 host->saved_params.core_freq = core_freq; 145 host->saved_params.rate = rate; 146 147 return 0; 148 } 149 150 static int spdif_out_trigger(struct snd_pcm_substream *substream, int cmd, 151 struct snd_soc_dai *dai) 152 { 153 struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai); 154 u32 ctrl; 155 int ret = 0; 156 157 if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) 158 return -EINVAL; 159 160 switch (cmd) { 161 case SNDRV_PCM_TRIGGER_START: 162 case SNDRV_PCM_TRIGGER_RESUME: 163 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 164 ctrl = readl(host->io_base + SPDIF_OUT_CTRL); 165 ctrl &= ~SPDIF_OPMODE_MASK; 166 if (!host->saved_params.mute) 167 ctrl |= SPDIF_OPMODE_AUD_DATA | 168 SPDIF_STATE_NORMAL; 169 else 170 ctrl |= SPDIF_OPMODE_MUTE_PCM; 171 writel(ctrl, host->io_base + SPDIF_OUT_CTRL); 172 break; 173 174 case SNDRV_PCM_TRIGGER_STOP: 175 case SNDRV_PCM_TRIGGER_SUSPEND: 176 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 177 ctrl = readl(host->io_base + SPDIF_OUT_CTRL); 178 ctrl &= ~SPDIF_OPMODE_MASK; 179 ctrl |= SPDIF_OPMODE_OFF; 180 writel(ctrl, host->io_base + SPDIF_OUT_CTRL); 181 break; 182 183 default: 184 ret = -EINVAL; 185 break; 186 } 187 return ret; 188 } 189 190 static int spdif_digital_mute(struct snd_soc_dai *dai, int mute) 191 { 192 struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai); 193 u32 val; 194 195 host->saved_params.mute = mute; 196 val = readl(host->io_base + SPDIF_OUT_CTRL); 197 val &= ~SPDIF_OPMODE_MASK; 198 199 if (mute) 200 val |= SPDIF_OPMODE_MUTE_PCM; 201 else { 202 if (host->running) 203 val |= SPDIF_OPMODE_AUD_DATA | SPDIF_STATE_NORMAL; 204 else 205 val |= SPDIF_OPMODE_OFF; 206 } 207 208 writel(val, host->io_base + SPDIF_OUT_CTRL); 209 return 0; 210 } 211 212 static int spdif_mute_get(struct snd_kcontrol *kcontrol, 213 struct snd_ctl_elem_value *ucontrol) 214 { 215 struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol); 216 struct snd_soc_card *card = codec->card; 217 struct snd_soc_pcm_runtime *rtd = card->rtd; 218 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 219 struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai); 220 221 ucontrol->value.integer.value[0] = host->saved_params.mute; 222 return 0; 223 } 224 225 static int spdif_mute_put(struct snd_kcontrol *kcontrol, 226 struct snd_ctl_elem_value *ucontrol) 227 { 228 struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol); 229 struct snd_soc_card *card = codec->card; 230 struct snd_soc_pcm_runtime *rtd = card->rtd; 231 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 232 struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai); 233 234 if (host->saved_params.mute == ucontrol->value.integer.value[0]) 235 return 0; 236 237 spdif_digital_mute(cpu_dai, ucontrol->value.integer.value[0]); 238 239 return 1; 240 } 241 static const struct snd_kcontrol_new spdif_out_controls[] = { 242 SOC_SINGLE_BOOL_EXT("IEC958 Playback Switch", 0, 243 spdif_mute_get, spdif_mute_put), 244 }; 245 246 int spdif_soc_dai_probe(struct snd_soc_dai *dai) 247 { 248 return snd_soc_add_dai_controls(dai, spdif_out_controls, 249 ARRAY_SIZE(spdif_out_controls)); 250 } 251 252 static const struct snd_soc_dai_ops spdif_out_dai_ops = { 253 .digital_mute = spdif_digital_mute, 254 .startup = spdif_out_startup, 255 .shutdown = spdif_out_shutdown, 256 .trigger = spdif_out_trigger, 257 .hw_params = spdif_out_hw_params, 258 }; 259 260 static struct snd_soc_dai_driver spdif_out_dai = { 261 .playback = { 262 .channels_min = 2, 263 .channels_max = 2, 264 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ 265 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \ 266 SNDRV_PCM_RATE_192000), 267 .formats = SNDRV_PCM_FMTBIT_S16_LE, 268 }, 269 .probe = spdif_soc_dai_probe, 270 .ops = &spdif_out_dai_ops, 271 }; 272 273 static const struct snd_soc_component_driver spdif_out_component = { 274 .name = "spdif-out", 275 }; 276 277 static int spdif_out_probe(struct platform_device *pdev) 278 { 279 struct spdif_out_dev *host; 280 struct spear_spdif_platform_data *pdata; 281 struct resource *res; 282 int ret; 283 284 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 285 if (!res) 286 return -EINVAL; 287 288 if (!devm_request_mem_region(&pdev->dev, res->start, 289 resource_size(res), pdev->name)) { 290 dev_warn(&pdev->dev, "Failed to get memory resourse\n"); 291 return -ENOENT; 292 } 293 294 host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL); 295 if (!host) { 296 dev_warn(&pdev->dev, "kzalloc fail\n"); 297 return -ENOMEM; 298 } 299 300 host->io_base = devm_ioremap(&pdev->dev, res->start, 301 resource_size(res)); 302 if (!host->io_base) { 303 dev_warn(&pdev->dev, "ioremap failed\n"); 304 return -ENOMEM; 305 } 306 307 host->clk = clk_get(&pdev->dev, NULL); 308 if (IS_ERR(host->clk)) 309 return PTR_ERR(host->clk); 310 311 pdata = dev_get_platdata(&pdev->dev); 312 313 host->dma_params.data = pdata->dma_params; 314 host->dma_params.addr = res->start + SPDIF_OUT_FIFO_DATA; 315 host->dma_params.max_burst = 16; 316 host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 317 host->dma_params.filter = pdata->filter; 318 319 dev_set_drvdata(&pdev->dev, host); 320 321 ret = snd_soc_register_component(&pdev->dev, &spdif_out_component, 322 &spdif_out_dai, 1); 323 if (ret != 0) { 324 clk_put(host->clk); 325 return ret; 326 } 327 328 return 0; 329 } 330 331 static int spdif_out_remove(struct platform_device *pdev) 332 { 333 struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev); 334 335 snd_soc_unregister_component(&pdev->dev); 336 dev_set_drvdata(&pdev->dev, NULL); 337 338 clk_put(host->clk); 339 340 return 0; 341 } 342 343 #ifdef CONFIG_PM 344 static int spdif_out_suspend(struct device *dev) 345 { 346 struct platform_device *pdev = to_platform_device(dev); 347 struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev); 348 349 if (host->running) 350 clk_disable(host->clk); 351 352 return 0; 353 } 354 355 static int spdif_out_resume(struct device *dev) 356 { 357 struct platform_device *pdev = to_platform_device(dev); 358 struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev); 359 360 if (host->running) { 361 clk_enable(host->clk); 362 spdif_out_configure(host); 363 spdif_out_clock(host, host->saved_params.core_freq, 364 host->saved_params.rate); 365 } 366 return 0; 367 } 368 369 static SIMPLE_DEV_PM_OPS(spdif_out_dev_pm_ops, spdif_out_suspend, \ 370 spdif_out_resume); 371 372 #define SPDIF_OUT_DEV_PM_OPS (&spdif_out_dev_pm_ops) 373 374 #else 375 #define SPDIF_OUT_DEV_PM_OPS NULL 376 377 #endif 378 379 static struct platform_driver spdif_out_driver = { 380 .probe = spdif_out_probe, 381 .remove = spdif_out_remove, 382 .driver = { 383 .name = "spdif-out", 384 .owner = THIS_MODULE, 385 .pm = SPDIF_OUT_DEV_PM_OPS, 386 }, 387 }; 388 389 module_platform_driver(spdif_out_driver); 390 391 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>"); 392 MODULE_DESCRIPTION("SPEAr SPDIF OUT SoC Interface"); 393 MODULE_LICENSE("GPL"); 394 MODULE_ALIAS("platform:spdif_out"); 395