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/dmaengine_pcm.h> 22 #include <sound/soc.h> 23 #include <sound/spear_dma.h> 24 #include <sound/spear_spdif.h> 25 #include "spdif_out_regs.h" 26 #include "spear_pcm.h" 27 28 struct spdif_out_params { 29 u32 rate; 30 u32 core_freq; 31 u32 mute; 32 }; 33 34 struct spdif_out_dev { 35 struct clk *clk; 36 struct spear_dma_data dma_params; 37 struct spdif_out_params saved_params; 38 u32 running; 39 void __iomem *io_base; 40 struct snd_dmaengine_dai_dma_data dma_params_tx; 41 struct snd_dmaengine_pcm_config config; 42 }; 43 44 static void spdif_out_configure(struct spdif_out_dev *host) 45 { 46 writel(SPDIF_OUT_RESET, host->io_base + SPDIF_OUT_SOFT_RST); 47 mdelay(1); 48 writel(readl(host->io_base + SPDIF_OUT_SOFT_RST) & ~SPDIF_OUT_RESET, 49 host->io_base + SPDIF_OUT_SOFT_RST); 50 51 writel(SPDIF_OUT_FDMA_TRIG_16 | SPDIF_OUT_MEMFMT_16_16 | 52 SPDIF_OUT_VALID_HW | SPDIF_OUT_USER_HW | 53 SPDIF_OUT_CHNLSTA_HW | SPDIF_OUT_PARITY_HW, 54 host->io_base + SPDIF_OUT_CFG); 55 56 writel(0x7F, host->io_base + SPDIF_OUT_INT_STA_CLR); 57 writel(0x7F, host->io_base + SPDIF_OUT_INT_EN_CLR); 58 } 59 60 static int spdif_out_startup(struct snd_pcm_substream *substream, 61 struct snd_soc_dai *cpu_dai) 62 { 63 struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai); 64 int ret; 65 66 if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) 67 return -EINVAL; 68 69 ret = clk_enable(host->clk); 70 if (ret) 71 return ret; 72 73 host->running = true; 74 spdif_out_configure(host); 75 76 return 0; 77 } 78 79 static void spdif_out_shutdown(struct snd_pcm_substream *substream, 80 struct snd_soc_dai *dai) 81 { 82 struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai); 83 84 if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) 85 return; 86 87 clk_disable(host->clk); 88 host->running = false; 89 } 90 91 static void spdif_out_clock(struct spdif_out_dev *host, u32 core_freq, 92 u32 rate) 93 { 94 u32 divider, ctrl; 95 96 clk_set_rate(host->clk, core_freq); 97 divider = DIV_ROUND_CLOSEST(clk_get_rate(host->clk), (rate * 128)); 98 99 ctrl = readl(host->io_base + SPDIF_OUT_CTRL); 100 ctrl &= ~SPDIF_DIVIDER_MASK; 101 ctrl |= (divider << SPDIF_DIVIDER_SHIFT) & SPDIF_DIVIDER_MASK; 102 writel(ctrl, host->io_base + SPDIF_OUT_CTRL); 103 } 104 105 static int spdif_out_hw_params(struct snd_pcm_substream *substream, 106 struct snd_pcm_hw_params *params, 107 struct snd_soc_dai *dai) 108 { 109 struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai); 110 u32 rate, core_freq; 111 112 if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) 113 return -EINVAL; 114 115 rate = params_rate(params); 116 117 switch (rate) { 118 case 8000: 119 case 16000: 120 case 32000: 121 case 64000: 122 /* 123 * The clock is multiplied by 10 to bring it to feasible range 124 * of frequencies for sscg 125 */ 126 core_freq = 64000 * 128 * 10; /* 81.92 MHz */ 127 break; 128 case 5512: 129 case 11025: 130 case 22050: 131 case 44100: 132 case 88200: 133 case 176400: 134 core_freq = 176400 * 128; /* 22.5792 MHz */ 135 break; 136 case 48000: 137 case 96000: 138 case 192000: 139 default: 140 core_freq = 192000 * 128; /* 24.576 MHz */ 141 break; 142 } 143 144 spdif_out_clock(host, core_freq, rate); 145 host->saved_params.core_freq = core_freq; 146 host->saved_params.rate = rate; 147 148 return 0; 149 } 150 151 static int spdif_out_trigger(struct snd_pcm_substream *substream, int cmd, 152 struct snd_soc_dai *dai) 153 { 154 struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai); 155 u32 ctrl; 156 int ret = 0; 157 158 if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) 159 return -EINVAL; 160 161 switch (cmd) { 162 case SNDRV_PCM_TRIGGER_START: 163 case SNDRV_PCM_TRIGGER_RESUME: 164 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 165 ctrl = readl(host->io_base + SPDIF_OUT_CTRL); 166 ctrl &= ~SPDIF_OPMODE_MASK; 167 if (!host->saved_params.mute) 168 ctrl |= SPDIF_OPMODE_AUD_DATA | 169 SPDIF_STATE_NORMAL; 170 else 171 ctrl |= SPDIF_OPMODE_MUTE_PCM; 172 writel(ctrl, host->io_base + SPDIF_OUT_CTRL); 173 break; 174 175 case SNDRV_PCM_TRIGGER_STOP: 176 case SNDRV_PCM_TRIGGER_SUSPEND: 177 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 178 ctrl = readl(host->io_base + SPDIF_OUT_CTRL); 179 ctrl &= ~SPDIF_OPMODE_MASK; 180 ctrl |= SPDIF_OPMODE_OFF; 181 writel(ctrl, host->io_base + SPDIF_OUT_CTRL); 182 break; 183 184 default: 185 ret = -EINVAL; 186 break; 187 } 188 return ret; 189 } 190 191 static int spdif_mute(struct snd_soc_dai *dai, int mute, int direction) 192 { 193 struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai); 194 u32 val; 195 196 host->saved_params.mute = mute; 197 val = readl(host->io_base + SPDIF_OUT_CTRL); 198 val &= ~SPDIF_OPMODE_MASK; 199 200 if (mute) 201 val |= SPDIF_OPMODE_MUTE_PCM; 202 else { 203 if (host->running) 204 val |= SPDIF_OPMODE_AUD_DATA | SPDIF_STATE_NORMAL; 205 else 206 val |= SPDIF_OPMODE_OFF; 207 } 208 209 writel(val, host->io_base + SPDIF_OUT_CTRL); 210 return 0; 211 } 212 213 static int spdif_mute_get(struct snd_kcontrol *kcontrol, 214 struct snd_ctl_elem_value *ucontrol) 215 { 216 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol); 217 struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai); 218 219 ucontrol->value.integer.value[0] = host->saved_params.mute; 220 return 0; 221 } 222 223 static int spdif_mute_put(struct snd_kcontrol *kcontrol, 224 struct snd_ctl_elem_value *ucontrol) 225 { 226 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol); 227 struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai); 228 229 if (host->saved_params.mute == ucontrol->value.integer.value[0]) 230 return 0; 231 232 spdif_mute(cpu_dai, ucontrol->value.integer.value[0], 233 SNDRV_PCM_STREAM_PLAYBACK); 234 235 return 1; 236 } 237 static const struct snd_kcontrol_new spdif_out_controls[] = { 238 SOC_SINGLE_BOOL_EXT("IEC958 Playback Switch", 0, 239 spdif_mute_get, spdif_mute_put), 240 }; 241 242 static int spdif_soc_dai_probe(struct snd_soc_dai *dai) 243 { 244 struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai); 245 246 host->dma_params_tx.filter_data = &host->dma_params; 247 248 snd_soc_dai_dma_data_set_playback(dai, &host->dma_params_tx); 249 250 return snd_soc_add_dai_controls(dai, spdif_out_controls, 251 ARRAY_SIZE(spdif_out_controls)); 252 } 253 254 static const struct snd_soc_dai_ops spdif_out_dai_ops = { 255 .mute_stream = spdif_mute, 256 .startup = spdif_out_startup, 257 .shutdown = spdif_out_shutdown, 258 .trigger = spdif_out_trigger, 259 .hw_params = spdif_out_hw_params, 260 .no_capture_mute = 1, 261 }; 262 263 static struct snd_soc_dai_driver spdif_out_dai = { 264 .playback = { 265 .channels_min = 2, 266 .channels_max = 2, 267 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ 268 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \ 269 SNDRV_PCM_RATE_192000), 270 .formats = SNDRV_PCM_FMTBIT_S16_LE, 271 }, 272 .probe = spdif_soc_dai_probe, 273 .ops = &spdif_out_dai_ops, 274 }; 275 276 static const struct snd_soc_component_driver spdif_out_component = { 277 .name = "spdif-out", 278 .legacy_dai_naming = 1, 279 }; 280 281 static int spdif_out_probe(struct platform_device *pdev) 282 { 283 struct spdif_out_dev *host; 284 struct spear_spdif_platform_data *pdata; 285 struct resource *res; 286 int ret; 287 288 host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL); 289 if (!host) 290 return -ENOMEM; 291 292 host->io_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res); 293 if (IS_ERR(host->io_base)) 294 return PTR_ERR(host->io_base); 295 296 host->clk = devm_clk_get(&pdev->dev, NULL); 297 if (IS_ERR(host->clk)) 298 return PTR_ERR(host->clk); 299 300 pdata = dev_get_platdata(&pdev->dev); 301 302 host->dma_params.data = pdata->dma_params; 303 host->dma_params.addr = res->start + SPDIF_OUT_FIFO_DATA; 304 host->dma_params.max_burst = 16; 305 host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 306 307 dev_set_drvdata(&pdev->dev, host); 308 309 ret = devm_snd_soc_register_component(&pdev->dev, &spdif_out_component, 310 &spdif_out_dai, 1); 311 if (ret) 312 return ret; 313 314 return devm_spear_pcm_platform_register(&pdev->dev, &host->config, 315 pdata->filter); 316 } 317 318 #ifdef CONFIG_PM 319 static int spdif_out_suspend(struct device *dev) 320 { 321 struct platform_device *pdev = to_platform_device(dev); 322 struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev); 323 324 if (host->running) 325 clk_disable(host->clk); 326 327 return 0; 328 } 329 330 static int spdif_out_resume(struct device *dev) 331 { 332 struct platform_device *pdev = to_platform_device(dev); 333 struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev); 334 335 if (host->running) { 336 clk_enable(host->clk); 337 spdif_out_configure(host); 338 spdif_out_clock(host, host->saved_params.core_freq, 339 host->saved_params.rate); 340 } 341 return 0; 342 } 343 344 static SIMPLE_DEV_PM_OPS(spdif_out_dev_pm_ops, spdif_out_suspend, \ 345 spdif_out_resume); 346 347 #define SPDIF_OUT_DEV_PM_OPS (&spdif_out_dev_pm_ops) 348 349 #else 350 #define SPDIF_OUT_DEV_PM_OPS NULL 351 352 #endif 353 354 static struct platform_driver spdif_out_driver = { 355 .probe = spdif_out_probe, 356 .driver = { 357 .name = "spdif-out", 358 .pm = SPDIF_OUT_DEV_PM_OPS, 359 }, 360 }; 361 362 module_platform_driver(spdif_out_driver); 363 364 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>"); 365 MODULE_DESCRIPTION("SPEAr SPDIF OUT SoC Interface"); 366 MODULE_LICENSE("GPL"); 367 MODULE_ALIAS("platform:spdif_out"); 368