/* * Copyright (C) STMicroelectronics SA 2015 * Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com> * for STMicroelectronics. * License terms: GNU General Public License (GPL), version 2 */ #include <linux/io.h> #include <linux/module.h> #include <linux/regmap.h> #include <linux/reset.h> #include <linux/mfd/syscon.h> #include <sound/soc.h> #include <sound/soc-dapm.h> /* DAC definitions */ /* stih407 DAC registers */ /* sysconf 5041: Audio-Gue-Control */ #define STIH407_AUDIO_GLUE_CTRL 0x000000A4 /* sysconf 5042: Audio-DAC-Control */ #define STIH407_AUDIO_DAC_CTRL 0x000000A8 /* DAC definitions */ #define STIH407_DAC_SOFTMUTE 0x0 #define STIH407_DAC_STANDBY_ANA 0x1 #define STIH407_DAC_STANDBY 0x2 #define STIH407_DAC_SOFTMUTE_MASK BIT(STIH407_DAC_SOFTMUTE) #define STIH407_DAC_STANDBY_ANA_MASK BIT(STIH407_DAC_STANDBY_ANA) #define STIH407_DAC_STANDBY_MASK BIT(STIH407_DAC_STANDBY) /* SPDIF definitions */ #define SPDIF_BIPHASE_ENABLE 0x6 #define SPDIF_BIPHASE_IDLE 0x7 #define SPDIF_BIPHASE_ENABLE_MASK BIT(SPDIF_BIPHASE_ENABLE) #define SPDIF_BIPHASE_IDLE_MASK BIT(SPDIF_BIPHASE_IDLE) enum { STI_SAS_DAI_SPDIF_OUT, STI_SAS_DAI_ANALOG_OUT, }; static const struct reg_default stih407_sas_reg_defaults[] = { { STIH407_AUDIO_DAC_CTRL, 0x000000000 }, { STIH407_AUDIO_GLUE_CTRL, 0x00000040 }, }; struct sti_dac_audio { struct regmap *regmap; struct regmap *virt_regmap; struct regmap_field **field; struct reset_control *rst; int mclk; }; struct sti_spdif_audio { struct regmap *regmap; struct regmap_field **field; int mclk; }; /* device data structure */ struct sti_sas_dev_data { const struct regmap_config *regmap; const struct snd_soc_dai_ops *dac_ops; /* DAC function callbacks */ const struct snd_soc_dapm_widget *dapm_widgets; /* dapms declaration */ const int num_dapm_widgets; /* dapms declaration */ const struct snd_soc_dapm_route *dapm_routes; /* route declaration */ const int num_dapm_routes; /* route declaration */ }; /* driver data structure */ struct sti_sas_data { struct device *dev; const struct sti_sas_dev_data *dev_data; struct sti_dac_audio dac; struct sti_spdif_audio spdif; }; /* Read a register from the sysconf reg bank */ static int sti_sas_read_reg(void *context, unsigned int reg, unsigned int *value) { struct sti_sas_data *drvdata = context; int status; u32 val; status = regmap_read(drvdata->dac.regmap, reg, &val); *value = (unsigned int)val; return status; } /* Read a register from the sysconf reg bank */ static int sti_sas_write_reg(void *context, unsigned int reg, unsigned int value) { struct sti_sas_data *drvdata = context; int status; status = regmap_write(drvdata->dac.regmap, reg, value); return status; } static int sti_sas_init_sas_registers(struct snd_soc_codec *codec, struct sti_sas_data *data) { int ret; /* * DAC and SPDIF are activated by default * put them in IDLE to save power */ /* Initialise bi-phase formatter to disabled */ ret = snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL, SPDIF_BIPHASE_ENABLE_MASK, 0); if (!ret) /* Initialise bi-phase formatter idle value to 0 */ ret = snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL, SPDIF_BIPHASE_IDLE_MASK, 0); if (ret < 0) { dev_err(codec->dev, "Failed to update SPDIF registers\n"); return ret; } /* Init DAC configuration */ /* init configuration */ ret = snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL, STIH407_DAC_STANDBY_MASK, STIH407_DAC_STANDBY_MASK); if (!ret) ret = snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL, STIH407_DAC_STANDBY_ANA_MASK, STIH407_DAC_STANDBY_ANA_MASK); if (!ret) ret = snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL, STIH407_DAC_SOFTMUTE_MASK, STIH407_DAC_SOFTMUTE_MASK); if (ret < 0) { dev_err(codec->dev, "Failed to update DAC registers\n"); return ret; } return ret; } /* * DAC */ static int sti_sas_dac_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) { /* Sanity check only */ if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) { dev_err(dai->codec->dev, "%s: ERROR: Unsupporter master mask 0x%x\n", __func__, fmt & SND_SOC_DAIFMT_MASTER_MASK); return -EINVAL; } return 0; } static const struct snd_soc_dapm_widget stih407_sas_dapm_widgets[] = { SND_SOC_DAPM_OUT_DRV("DAC standby ana", STIH407_AUDIO_DAC_CTRL, STIH407_DAC_STANDBY_ANA, 1, NULL, 0), SND_SOC_DAPM_DAC("DAC standby", "dac_p", STIH407_AUDIO_DAC_CTRL, STIH407_DAC_STANDBY, 1), SND_SOC_DAPM_OUTPUT("DAC Output"), }; static const struct snd_soc_dapm_route stih407_sas_route[] = { {"DAC Output", NULL, "DAC standby ana"}, {"DAC standby ana", NULL, "DAC standby"}, }; static int stih407_sas_dac_mute(struct snd_soc_dai *dai, int mute, int stream) { struct snd_soc_codec *codec = dai->codec; if (mute) { return snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL, STIH407_DAC_SOFTMUTE_MASK, STIH407_DAC_SOFTMUTE_MASK); } else { return snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL, STIH407_DAC_SOFTMUTE_MASK, 0); } } /* * SPDIF */ static int sti_sas_spdif_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) { if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) { dev_err(dai->codec->dev, "%s: ERROR: Unsupporter master mask 0x%x\n", __func__, fmt & SND_SOC_DAIFMT_MASTER_MASK); return -EINVAL; } return 0; } /* * sti_sas_spdif_trigger: * Trigger function is used to ensure that BiPhase Formater is disabled * before CPU dai is stopped. * This is mandatory to avoid that BPF is stalled */ static int sti_sas_spdif_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { struct snd_soc_codec *codec = dai->codec; switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: return snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL, SPDIF_BIPHASE_ENABLE_MASK, SPDIF_BIPHASE_ENABLE_MASK); case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: return snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL, SPDIF_BIPHASE_ENABLE_MASK, 0); default: return -EINVAL; } } static bool sti_sas_volatile_register(struct device *dev, unsigned int reg) { if (reg == STIH407_AUDIO_GLUE_CTRL) return true; return false; } /* * CODEC DAIS */ /* * sti_sas_set_sysclk: * get MCLK input frequency to check that MCLK-FS ratio is coherent */ static int sti_sas_set_sysclk(struct snd_soc_dai *dai, int clk_id, unsigned int freq, int dir) { struct snd_soc_codec *codec = dai->codec; struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev); if (dir == SND_SOC_CLOCK_OUT) return 0; if (clk_id != 0) return -EINVAL; switch (dai->id) { case STI_SAS_DAI_SPDIF_OUT: drvdata->spdif.mclk = freq; break; case STI_SAS_DAI_ANALOG_OUT: drvdata->dac.mclk = freq; break; } return 0; } static int sti_sas_prepare(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct snd_soc_codec *codec = dai->codec; struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev); struct snd_pcm_runtime *runtime = substream->runtime; switch (dai->id) { case STI_SAS_DAI_SPDIF_OUT: if ((drvdata->spdif.mclk / runtime->rate) != 128) { dev_err(codec->dev, "unexpected mclk-fs ratio\n"); return -EINVAL; } break; case STI_SAS_DAI_ANALOG_OUT: if ((drvdata->dac.mclk / runtime->rate) != 256) { dev_err(codec->dev, "unexpected mclk-fs ratio\n"); return -EINVAL; } break; } return 0; } static const struct snd_soc_dai_ops stih407_dac_ops = { .set_fmt = sti_sas_dac_set_fmt, .mute_stream = stih407_sas_dac_mute, .prepare = sti_sas_prepare, .set_sysclk = sti_sas_set_sysclk, }; static const struct regmap_config stih407_sas_regmap = { .reg_bits = 32, .val_bits = 32, .fast_io = true, .max_register = STIH407_AUDIO_DAC_CTRL, .reg_defaults = stih407_sas_reg_defaults, .num_reg_defaults = ARRAY_SIZE(stih407_sas_reg_defaults), .volatile_reg = sti_sas_volatile_register, .cache_type = REGCACHE_RBTREE, .reg_read = sti_sas_read_reg, .reg_write = sti_sas_write_reg, }; static const struct sti_sas_dev_data stih407_data = { .regmap = &stih407_sas_regmap, .dac_ops = &stih407_dac_ops, .dapm_widgets = stih407_sas_dapm_widgets, .num_dapm_widgets = ARRAY_SIZE(stih407_sas_dapm_widgets), .dapm_routes = stih407_sas_route, .num_dapm_routes = ARRAY_SIZE(stih407_sas_route), }; static struct snd_soc_dai_driver sti_sas_dai[] = { { .name = "sas-dai-spdif-out", .id = STI_SAS_DAI_SPDIF_OUT, .playback = { .stream_name = "spdif_p", .channels_min = 2, .channels_max = 2, .rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_64000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_192000, .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE, }, .ops = (struct snd_soc_dai_ops[]) { { .set_fmt = sti_sas_spdif_set_fmt, .trigger = sti_sas_spdif_trigger, .set_sysclk = sti_sas_set_sysclk, .prepare = sti_sas_prepare, } }, }, { .name = "sas-dai-dac", .id = STI_SAS_DAI_ANALOG_OUT, .playback = { .stream_name = "dac_p", .channels_min = 2, .channels_max = 2, .rates = SNDRV_PCM_RATE_8000_48000, .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE, }, }, }; #ifdef CONFIG_PM_SLEEP static int sti_sas_resume(struct snd_soc_codec *codec) { struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev); return sti_sas_init_sas_registers(codec, drvdata); } #else #define sti_sas_resume NULL #endif static int sti_sas_codec_probe(struct snd_soc_codec *codec) { struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev); int ret; ret = sti_sas_init_sas_registers(codec, drvdata); return ret; } static struct snd_soc_codec_driver sti_sas_driver = { .probe = sti_sas_codec_probe, .resume = sti_sas_resume, }; static const struct of_device_id sti_sas_dev_match[] = { { .compatible = "st,stih407-sas-codec", .data = &stih407_data, }, {}, }; static int sti_sas_driver_probe(struct platform_device *pdev) { struct device_node *pnode = pdev->dev.of_node; struct sti_sas_data *drvdata; const struct of_device_id *of_id; /* Allocate device structure */ drvdata = devm_kzalloc(&pdev->dev, sizeof(struct sti_sas_data), GFP_KERNEL); if (!drvdata) return -ENOMEM; /* Populate data structure depending on compatibility */ of_id = of_match_node(sti_sas_dev_match, pnode); if (!of_id->data) { dev_err(&pdev->dev, "data associated to device is missing\n"); return -EINVAL; } drvdata->dev_data = (struct sti_sas_dev_data *)of_id->data; /* Initialise device structure */ drvdata->dev = &pdev->dev; /* Request the DAC & SPDIF registers memory region */ drvdata->dac.virt_regmap = devm_regmap_init(&pdev->dev, NULL, drvdata, drvdata->dev_data->regmap); if (IS_ERR(drvdata->dac.virt_regmap)) { dev_err(&pdev->dev, "audio registers not enabled\n"); return PTR_ERR(drvdata->dac.virt_regmap); } /* Request the syscon region */ drvdata->dac.regmap = syscon_regmap_lookup_by_phandle(pnode, "st,syscfg"); if (IS_ERR(drvdata->dac.regmap)) { dev_err(&pdev->dev, "syscon registers not available\n"); return PTR_ERR(drvdata->dac.regmap); } drvdata->spdif.regmap = drvdata->dac.regmap; sti_sas_dai[STI_SAS_DAI_ANALOG_OUT].ops = drvdata->dev_data->dac_ops; /* Set dapms*/ sti_sas_driver.component_driver.dapm_widgets = drvdata->dev_data->dapm_widgets; sti_sas_driver.component_driver.num_dapm_widgets = drvdata->dev_data->num_dapm_widgets; sti_sas_driver.component_driver.dapm_routes = drvdata->dev_data->dapm_routes; sti_sas_driver.component_driver.num_dapm_routes = drvdata->dev_data->num_dapm_routes; /* Store context */ dev_set_drvdata(&pdev->dev, drvdata); return snd_soc_register_codec(&pdev->dev, &sti_sas_driver, sti_sas_dai, ARRAY_SIZE(sti_sas_dai)); } static int sti_sas_driver_remove(struct platform_device *pdev) { snd_soc_unregister_codec(&pdev->dev); return 0; } static struct platform_driver sti_sas_platform_driver = { .driver = { .name = "sti-sas-codec", .of_match_table = sti_sas_dev_match, }, .probe = sti_sas_driver_probe, .remove = sti_sas_driver_remove, }; module_platform_driver(sti_sas_platform_driver); MODULE_DESCRIPTION("audio codec for STMicroelectronics sti platforms"); MODULE_AUTHOR("Arnaud.pouliquen@st.com"); MODULE_LICENSE("GPL v2");