Sjoerd Simons | f874b80 | 2015-10-08 15:31:13 +0200 | [diff] [blame] | 1 | /* sound/soc/rockchip/rk_spdif.c |
| 2 | * |
| 3 | * ALSA SoC Audio Layer - Rockchip I2S Controller driver |
| 4 | * |
| 5 | * Copyright (c) 2014 Rockchip Electronics Co. Ltd. |
| 6 | * Author: Jianqun <jay.xu@rock-chips.com> |
| 7 | * Copyright (c) 2015 Collabora Ltd. |
| 8 | * Author: Sjoerd Simons <sjoerd.simons@collabora.co.uk> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/delay.h> |
| 17 | #include <linux/of_gpio.h> |
| 18 | #include <linux/clk.h> |
| 19 | #include <linux/pm_runtime.h> |
| 20 | #include <linux/mfd/syscon.h> |
| 21 | #include <linux/regmap.h> |
| 22 | #include <sound/pcm_params.h> |
| 23 | #include <sound/dmaengine_pcm.h> |
| 24 | |
| 25 | #include "rockchip_spdif.h" |
| 26 | |
| 27 | enum rk_spdif_type { |
| 28 | RK_SPDIF_RK3066, |
| 29 | RK_SPDIF_RK3188, |
| 30 | RK_SPDIF_RK3288, |
| 31 | }; |
| 32 | |
| 33 | #define RK3288_GRF_SOC_CON2 0x24c |
| 34 | |
| 35 | struct rk_spdif_dev { |
| 36 | struct device *dev; |
| 37 | |
| 38 | struct clk *mclk; |
| 39 | struct clk *hclk; |
| 40 | |
| 41 | struct snd_dmaengine_dai_dma_data playback_dma_data; |
| 42 | |
| 43 | struct regmap *regmap; |
| 44 | }; |
| 45 | |
| 46 | static const struct of_device_id rk_spdif_match[] = { |
| 47 | { .compatible = "rockchip,rk3066-spdif", |
| 48 | .data = (void *) RK_SPDIF_RK3066 }, |
| 49 | { .compatible = "rockchip,rk3188-spdif", |
| 50 | .data = (void *) RK_SPDIF_RK3188 }, |
| 51 | { .compatible = "rockchip,rk3288-spdif", |
| 52 | .data = (void *) RK_SPDIF_RK3288 }, |
| 53 | {}, |
| 54 | }; |
| 55 | MODULE_DEVICE_TABLE(of, rk_spdif_match); |
| 56 | |
| 57 | static int rk_spdif_runtime_suspend(struct device *dev) |
| 58 | { |
| 59 | struct rk_spdif_dev *spdif = dev_get_drvdata(dev); |
| 60 | |
| 61 | clk_disable_unprepare(spdif->mclk); |
| 62 | clk_disable_unprepare(spdif->hclk); |
| 63 | |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | static int rk_spdif_runtime_resume(struct device *dev) |
| 68 | { |
| 69 | struct rk_spdif_dev *spdif = dev_get_drvdata(dev); |
| 70 | int ret; |
| 71 | |
| 72 | ret = clk_prepare_enable(spdif->mclk); |
| 73 | if (ret) { |
| 74 | dev_err(spdif->dev, "mclk clock enable failed %d\n", ret); |
| 75 | return ret; |
| 76 | } |
| 77 | |
| 78 | ret = clk_prepare_enable(spdif->hclk); |
| 79 | if (ret) { |
| 80 | dev_err(spdif->dev, "hclk clock enable failed %d\n", ret); |
| 81 | return ret; |
| 82 | } |
| 83 | |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | static int rk_spdif_hw_params(struct snd_pcm_substream *substream, |
| 88 | struct snd_pcm_hw_params *params, |
| 89 | struct snd_soc_dai *dai) |
| 90 | { |
| 91 | struct rk_spdif_dev *spdif = snd_soc_dai_get_drvdata(dai); |
| 92 | unsigned int val = SPDIF_CFGR_HALFWORD_ENABLE; |
| 93 | int srate, mclk; |
| 94 | int ret; |
| 95 | |
| 96 | srate = params_rate(params); |
| 97 | switch (srate) { |
| 98 | case 32000: |
| 99 | case 48000: |
| 100 | case 96000: |
| 101 | mclk = 96000 * 128; /* 12288000 hz */ |
| 102 | break; |
| 103 | case 44100: |
| 104 | mclk = 44100 * 256; /* 11289600 hz */ |
| 105 | break; |
| 106 | case 192000: |
| 107 | mclk = 192000 * 128; /* 24576000 hz */ |
| 108 | break; |
| 109 | default: |
| 110 | return -EINVAL; |
| 111 | } |
| 112 | |
| 113 | switch (params_format(params)) { |
| 114 | case SNDRV_PCM_FORMAT_S16_LE: |
| 115 | val |= SPDIF_CFGR_VDW_16; |
| 116 | break; |
| 117 | case SNDRV_PCM_FORMAT_S20_3LE: |
| 118 | val |= SPDIF_CFGR_VDW_20; |
| 119 | break; |
| 120 | case SNDRV_PCM_FORMAT_S24_LE: |
| 121 | val |= SPDIF_CFGR_VDW_24; |
| 122 | break; |
| 123 | default: |
| 124 | return -EINVAL; |
| 125 | } |
| 126 | |
| 127 | /* Set clock and calculate divider */ |
| 128 | ret = clk_set_rate(spdif->mclk, mclk); |
| 129 | if (ret != 0) { |
| 130 | dev_err(spdif->dev, "Failed to set module clock rate: %d\n", |
| 131 | ret); |
| 132 | return ret; |
| 133 | } |
| 134 | |
| 135 | val |= SPDIF_CFGR_CLK_DIV(mclk/(srate * 256)); |
| 136 | ret = regmap_update_bits(spdif->regmap, SPDIF_CFGR, |
| 137 | SPDIF_CFGR_CLK_DIV_MASK | SPDIF_CFGR_HALFWORD_ENABLE | |
| 138 | SDPIF_CFGR_VDW_MASK, |
| 139 | val); |
| 140 | |
| 141 | return ret; |
| 142 | } |
| 143 | |
| 144 | static int rk_spdif_trigger(struct snd_pcm_substream *substream, |
| 145 | int cmd, struct snd_soc_dai *dai) |
| 146 | { |
| 147 | struct rk_spdif_dev *spdif = snd_soc_dai_get_drvdata(dai); |
| 148 | int ret; |
| 149 | |
| 150 | switch (cmd) { |
| 151 | case SNDRV_PCM_TRIGGER_START: |
| 152 | case SNDRV_PCM_TRIGGER_RESUME: |
| 153 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| 154 | ret = regmap_update_bits(spdif->regmap, SPDIF_DMACR, |
| 155 | SPDIF_DMACR_TDE_ENABLE, |
| 156 | SPDIF_DMACR_TDE_ENABLE); |
| 157 | |
| 158 | if (ret != 0) |
| 159 | return ret; |
| 160 | |
| 161 | ret = regmap_update_bits(spdif->regmap, SPDIF_XFER, |
| 162 | SPDIF_XFER_TXS_START, |
| 163 | SPDIF_XFER_TXS_START); |
| 164 | break; |
| 165 | case SNDRV_PCM_TRIGGER_SUSPEND: |
| 166 | case SNDRV_PCM_TRIGGER_STOP: |
| 167 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| 168 | ret = regmap_update_bits(spdif->regmap, SPDIF_DMACR, |
| 169 | SPDIF_DMACR_TDE_ENABLE, |
| 170 | SPDIF_DMACR_TDE_DISABLE); |
| 171 | |
| 172 | if (ret != 0) |
| 173 | return ret; |
| 174 | |
| 175 | ret = regmap_update_bits(spdif->regmap, SPDIF_XFER, |
| 176 | SPDIF_XFER_TXS_START, |
| 177 | SPDIF_XFER_TXS_STOP); |
| 178 | break; |
| 179 | default: |
| 180 | ret = -EINVAL; |
| 181 | break; |
| 182 | } |
| 183 | |
| 184 | return ret; |
| 185 | } |
| 186 | |
| 187 | static int rk_spdif_dai_probe(struct snd_soc_dai *dai) |
| 188 | { |
| 189 | struct rk_spdif_dev *spdif = snd_soc_dai_get_drvdata(dai); |
| 190 | |
| 191 | dai->playback_dma_data = &spdif->playback_dma_data; |
| 192 | |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | static const struct snd_soc_dai_ops rk_spdif_dai_ops = { |
| 197 | .hw_params = rk_spdif_hw_params, |
| 198 | .trigger = rk_spdif_trigger, |
| 199 | }; |
| 200 | |
| 201 | static struct snd_soc_dai_driver rk_spdif_dai = { |
| 202 | .probe = rk_spdif_dai_probe, |
| 203 | .playback = { |
| 204 | .stream_name = "Playback", |
| 205 | .channels_min = 2, |
| 206 | .channels_max = 2, |
| 207 | .rates = (SNDRV_PCM_RATE_32000 | |
| 208 | SNDRV_PCM_RATE_44100 | |
| 209 | SNDRV_PCM_RATE_48000 | |
| 210 | SNDRV_PCM_RATE_96000 | |
| 211 | SNDRV_PCM_RATE_192000), |
| 212 | .formats = (SNDRV_PCM_FMTBIT_S16_LE | |
| 213 | SNDRV_PCM_FMTBIT_S20_3LE | |
| 214 | SNDRV_PCM_FMTBIT_S24_LE), |
| 215 | }, |
| 216 | .ops = &rk_spdif_dai_ops, |
| 217 | }; |
| 218 | |
| 219 | static const struct snd_soc_component_driver rk_spdif_component = { |
| 220 | .name = "rockchip-spdif", |
| 221 | }; |
| 222 | |
| 223 | static bool rk_spdif_wr_reg(struct device *dev, unsigned int reg) |
| 224 | { |
| 225 | switch (reg) { |
| 226 | case SPDIF_CFGR: |
| 227 | case SPDIF_DMACR: |
| 228 | case SPDIF_INTCR: |
| 229 | case SPDIF_XFER: |
| 230 | case SPDIF_SMPDR: |
| 231 | return true; |
| 232 | default: |
| 233 | return false; |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | static bool rk_spdif_rd_reg(struct device *dev, unsigned int reg) |
| 238 | { |
| 239 | switch (reg) { |
| 240 | case SPDIF_CFGR: |
| 241 | case SPDIF_SDBLR: |
| 242 | case SPDIF_INTCR: |
| 243 | case SPDIF_INTSR: |
| 244 | case SPDIF_XFER: |
| 245 | return true; |
| 246 | default: |
| 247 | return false; |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | static bool rk_spdif_volatile_reg(struct device *dev, unsigned int reg) |
| 252 | { |
| 253 | switch (reg) { |
| 254 | case SPDIF_INTSR: |
| 255 | case SPDIF_SDBLR: |
| 256 | return true; |
| 257 | default: |
| 258 | return false; |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | static const struct regmap_config rk_spdif_regmap_config = { |
| 263 | .reg_bits = 32, |
| 264 | .reg_stride = 4, |
| 265 | .val_bits = 32, |
| 266 | .max_register = SPDIF_SMPDR, |
| 267 | .writeable_reg = rk_spdif_wr_reg, |
| 268 | .readable_reg = rk_spdif_rd_reg, |
| 269 | .volatile_reg = rk_spdif_volatile_reg, |
| 270 | .cache_type = REGCACHE_FLAT, |
| 271 | }; |
| 272 | |
| 273 | static int rk_spdif_probe(struct platform_device *pdev) |
| 274 | { |
| 275 | struct device_node *np = pdev->dev.of_node; |
| 276 | struct rk_spdif_dev *spdif; |
| 277 | const struct of_device_id *match; |
| 278 | struct resource *res; |
| 279 | void __iomem *regs; |
| 280 | int ret; |
| 281 | |
| 282 | match = of_match_node(rk_spdif_match, np); |
Arnd Bergmann | 0e18d45 | 2015-11-13 18:15:56 +0100 | [diff] [blame] | 283 | if (match->data == (void *)RK_SPDIF_RK3288) { |
Sjoerd Simons | f874b80 | 2015-10-08 15:31:13 +0200 | [diff] [blame] | 284 | struct regmap *grf; |
| 285 | |
| 286 | grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf"); |
| 287 | if (IS_ERR(grf)) { |
| 288 | dev_err(&pdev->dev, |
| 289 | "rockchip_spdif missing 'rockchip,grf' \n"); |
| 290 | return PTR_ERR(grf); |
| 291 | } |
| 292 | |
| 293 | /* Select the 8 channel SPDIF solution on RK3288 as |
| 294 | * the 2 channel one does not appear to work |
| 295 | */ |
| 296 | regmap_write(grf, RK3288_GRF_SOC_CON2, BIT(1) << 16); |
| 297 | } |
| 298 | |
| 299 | spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL); |
| 300 | if (!spdif) |
| 301 | return -ENOMEM; |
| 302 | |
| 303 | spdif->hclk = devm_clk_get(&pdev->dev, "hclk"); |
| 304 | if (IS_ERR(spdif->hclk)) { |
| 305 | dev_err(&pdev->dev, "Can't retrieve rk_spdif bus clock\n"); |
| 306 | return PTR_ERR(spdif->hclk); |
| 307 | } |
| 308 | ret = clk_prepare_enable(spdif->hclk); |
| 309 | if (ret) { |
| 310 | dev_err(spdif->dev, "hclock enable failed %d\n", ret); |
| 311 | return ret; |
| 312 | } |
| 313 | |
| 314 | spdif->mclk = devm_clk_get(&pdev->dev, "mclk"); |
| 315 | if (IS_ERR(spdif->mclk)) { |
| 316 | dev_err(&pdev->dev, "Can't retrieve rk_spdif master clock\n"); |
| 317 | return PTR_ERR(spdif->mclk); |
| 318 | } |
| 319 | |
| 320 | ret = clk_prepare_enable(spdif->mclk); |
| 321 | if (ret) { |
| 322 | dev_err(spdif->dev, "clock enable failed %d\n", ret); |
| 323 | return ret; |
| 324 | } |
| 325 | |
| 326 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 327 | regs = devm_ioremap_resource(&pdev->dev, res); |
| 328 | if (IS_ERR(regs)) |
| 329 | return PTR_ERR(regs); |
| 330 | |
| 331 | spdif->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "hclk", regs, |
| 332 | &rk_spdif_regmap_config); |
| 333 | if (IS_ERR(spdif->regmap)) { |
| 334 | dev_err(&pdev->dev, |
| 335 | "Failed to initialise managed register map\n"); |
| 336 | return PTR_ERR(spdif->regmap); |
| 337 | } |
| 338 | |
| 339 | spdif->playback_dma_data.addr = res->start + SPDIF_SMPDR; |
| 340 | spdif->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; |
| 341 | spdif->playback_dma_data.maxburst = 4; |
| 342 | |
| 343 | spdif->dev = &pdev->dev; |
| 344 | dev_set_drvdata(&pdev->dev, spdif); |
| 345 | |
| 346 | pm_runtime_set_active(&pdev->dev); |
| 347 | pm_runtime_enable(&pdev->dev); |
| 348 | pm_request_idle(&pdev->dev); |
| 349 | |
| 350 | ret = devm_snd_soc_register_component(&pdev->dev, |
| 351 | &rk_spdif_component, |
| 352 | &rk_spdif_dai, 1); |
| 353 | if (ret) { |
| 354 | dev_err(&pdev->dev, "Could not register DAI\n"); |
| 355 | goto err_pm_runtime; |
| 356 | } |
| 357 | |
Axel Lin | 2057020 | 2015-10-13 10:37:10 +0800 | [diff] [blame] | 358 | ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0); |
Sjoerd Simons | f874b80 | 2015-10-08 15:31:13 +0200 | [diff] [blame] | 359 | if (ret) { |
| 360 | dev_err(&pdev->dev, "Could not register PCM\n"); |
Axel Lin | 2057020 | 2015-10-13 10:37:10 +0800 | [diff] [blame] | 361 | goto err_pm_runtime; |
Sjoerd Simons | f874b80 | 2015-10-08 15:31:13 +0200 | [diff] [blame] | 362 | } |
| 363 | |
| 364 | return 0; |
| 365 | |
Sjoerd Simons | f874b80 | 2015-10-08 15:31:13 +0200 | [diff] [blame] | 366 | err_pm_runtime: |
| 367 | pm_runtime_disable(&pdev->dev); |
| 368 | |
| 369 | return ret; |
| 370 | } |
| 371 | |
| 372 | static int rk_spdif_remove(struct platform_device *pdev) |
| 373 | { |
| 374 | struct rk_spdif_dev *spdif = dev_get_drvdata(&pdev->dev); |
| 375 | |
| 376 | pm_runtime_disable(&pdev->dev); |
| 377 | if (!pm_runtime_status_suspended(&pdev->dev)) |
| 378 | rk_spdif_runtime_suspend(&pdev->dev); |
| 379 | |
| 380 | clk_disable_unprepare(spdif->mclk); |
| 381 | clk_disable_unprepare(spdif->hclk); |
Sjoerd Simons | f874b80 | 2015-10-08 15:31:13 +0200 | [diff] [blame] | 382 | |
| 383 | return 0; |
| 384 | } |
| 385 | |
| 386 | static const struct dev_pm_ops rk_spdif_pm_ops = { |
| 387 | SET_RUNTIME_PM_OPS(rk_spdif_runtime_suspend, rk_spdif_runtime_resume, |
| 388 | NULL) |
| 389 | }; |
| 390 | |
| 391 | static struct platform_driver rk_spdif_driver = { |
| 392 | .probe = rk_spdif_probe, |
| 393 | .remove = rk_spdif_remove, |
| 394 | .driver = { |
| 395 | .name = "rockchip-spdif", |
| 396 | .of_match_table = of_match_ptr(rk_spdif_match), |
| 397 | .pm = &rk_spdif_pm_ops, |
| 398 | }, |
| 399 | }; |
| 400 | module_platform_driver(rk_spdif_driver); |
| 401 | |
| 402 | MODULE_ALIAS("platform:rockchip-spdif"); |
| 403 | MODULE_DESCRIPTION("ROCKCHIP SPDIF transceiver Interface"); |
| 404 | MODULE_AUTHOR("Sjoerd Simons <sjoerd.simons@collabora.co.uk>"); |
| 405 | MODULE_LICENSE("GPL v2"); |