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1/*2 * ALSA SoC SPDIF Out Audio Layer for spear processors3 *4 * Copyright (C) 2012 ST Microelectronics5 * Vipin Kumar <vipin.kumar@st.com>6 *7 * This file is licensed under the terms of the GNU General Public8 * License version 2. This program is licensed "as is" without any9 * 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 28struct spdif_out_params {29 u32 rate;30 u32 core_freq;31 u32 mute;32};33 34struct 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 44static 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 60static 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 79static 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 91static 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 105static 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 range124 * of frequencies for sscg125 */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 151static 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 else171 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 191static 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 else206 val |= SPDIF_OPMODE_OFF;207 }208 209 writel(val, host->io_base + SPDIF_OUT_CTRL);210 return 0;211}212 213static 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 223static 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}237static 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 242static 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 254static 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 263static 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 276static const struct snd_soc_component_driver spdif_out_component = {277 .name = "spdif-out",278 .legacy_dai_naming = 1,279};280 281static 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_PM319static 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 330static 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 344static 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#else350#define SPDIF_OUT_DEV_PM_OPS NULL351 352#endif353 354static 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 362module_platform_driver(spdif_out_driver);363 364MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");365MODULE_DESCRIPTION("SPEAr SPDIF OUT SoC Interface");366MODULE_LICENSE("GPL");367MODULE_ALIAS("platform:spdif_out");368