Vipin Kumar | e584f9b | 2012-07-04 16:11:13 +0530 | [diff] [blame] | 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 | |
Kuninori Morimoto | a582d44 | 2013-03-21 03:37:00 -0700 | [diff] [blame] | 273 | static const struct snd_soc_component_driver spdif_out_component = { |
| 274 | .name = "spdif-out", |
| 275 | }; |
| 276 | |
Vipin Kumar | e584f9b | 2012-07-04 16:11:13 +0530 | [diff] [blame] | 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 | |
Kuninori Morimoto | a582d44 | 2013-03-21 03:37:00 -0700 | [diff] [blame] | 321 | ret = snd_soc_register_component(&pdev->dev, &spdif_out_component, |
| 322 | &spdif_out_dai, 1); |
Vipin Kumar | e584f9b | 2012-07-04 16:11:13 +0530 | [diff] [blame] | 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 | |
Kuninori Morimoto | a582d44 | 2013-03-21 03:37:00 -0700 | [diff] [blame] | 335 | snd_soc_unregister_component(&pdev->dev); |
Vipin Kumar | e584f9b | 2012-07-04 16:11:13 +0530 | [diff] [blame] | 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"); |