diff options
Diffstat (limited to 'sound/soc/atmel/atmel-pdmic.c')
| -rw-r--r-- | sound/soc/atmel/atmel-pdmic.c | 713 |
1 files changed, 713 insertions, 0 deletions
diff --git a/sound/soc/atmel/atmel-pdmic.c b/sound/soc/atmel/atmel-pdmic.c new file mode 100644 index 000000000..049383e54 --- /dev/null +++ b/sound/soc/atmel/atmel-pdmic.c @@ -0,0 +1,713 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Atmel PDMIC driver + * + * Copyright (C) 2015 Atmel + * + * Author: Songjun Wu <songjun.wu@atmel.com> + */ + +#include <linux/of.h> +#include <linux/clk.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <sound/core.h> +#include <sound/dmaengine_pcm.h> +#include <sound/pcm_params.h> +#include <sound/tlv.h> +#include "atmel-pdmic.h" + +struct atmel_pdmic_pdata { + u32 mic_min_freq; + u32 mic_max_freq; + s32 mic_offset; + const char *card_name; +}; + +struct atmel_pdmic { + dma_addr_t phy_base; + struct regmap *regmap; + struct clk *pclk; + struct clk *gclk; + struct device *dev; + int irq; + struct snd_pcm_substream *substream; + const struct atmel_pdmic_pdata *pdata; +}; + +static const struct of_device_id atmel_pdmic_of_match[] = { + { + .compatible = "atmel,sama5d2-pdmic", + }, { + /* sentinel */ + } +}; +MODULE_DEVICE_TABLE(of, atmel_pdmic_of_match); + +#define PDMIC_OFFSET_MAX_VAL S16_MAX +#define PDMIC_OFFSET_MIN_VAL S16_MIN + +static struct atmel_pdmic_pdata *atmel_pdmic_dt_init(struct device *dev) +{ + struct device_node *np = dev->of_node; + struct atmel_pdmic_pdata *pdata; + + if (!np) { + dev_err(dev, "device node not found\n"); + return ERR_PTR(-EINVAL); + } + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return ERR_PTR(-ENOMEM); + + if (of_property_read_string(np, "atmel,model", &pdata->card_name)) + pdata->card_name = "PDMIC"; + + if (of_property_read_u32(np, "atmel,mic-min-freq", + &pdata->mic_min_freq)) { + dev_err(dev, "failed to get mic-min-freq\n"); + return ERR_PTR(-EINVAL); + } + + if (of_property_read_u32(np, "atmel,mic-max-freq", + &pdata->mic_max_freq)) { + dev_err(dev, "failed to get mic-max-freq\n"); + return ERR_PTR(-EINVAL); + } + + if (pdata->mic_max_freq < pdata->mic_min_freq) { + dev_err(dev, + "mic-max-freq should not be less than mic-min-freq\n"); + return ERR_PTR(-EINVAL); + } + + if (of_property_read_s32(np, "atmel,mic-offset", &pdata->mic_offset)) + pdata->mic_offset = 0; + + if (pdata->mic_offset > PDMIC_OFFSET_MAX_VAL) { + dev_warn(dev, + "mic-offset value %d is larger than the max value %d, the max value is specified\n", + pdata->mic_offset, PDMIC_OFFSET_MAX_VAL); + pdata->mic_offset = PDMIC_OFFSET_MAX_VAL; + } else if (pdata->mic_offset < PDMIC_OFFSET_MIN_VAL) { + dev_warn(dev, + "mic-offset value %d is less than the min value %d, the min value is specified\n", + pdata->mic_offset, PDMIC_OFFSET_MIN_VAL); + pdata->mic_offset = PDMIC_OFFSET_MIN_VAL; + } + + return pdata; +} + +/* cpu dai component */ +static int atmel_pdmic_cpu_dai_startup(struct snd_pcm_substream *substream, + struct snd_soc_dai *cpu_dai) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card); + int ret; + + ret = clk_prepare_enable(dd->gclk); + if (ret) + return ret; + + ret = clk_prepare_enable(dd->pclk); + if (ret) { + clk_disable_unprepare(dd->gclk); + return ret; + } + + /* Clear all bits in the Control Register(PDMIC_CR) */ + regmap_write(dd->regmap, PDMIC_CR, 0); + + dd->substream = substream; + + /* Enable the overrun error interrupt */ + regmap_write(dd->regmap, PDMIC_IER, PDMIC_IER_OVRE); + + return 0; +} + +static void atmel_pdmic_cpu_dai_shutdown(struct snd_pcm_substream *substream, + struct snd_soc_dai *cpu_dai) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card); + + /* Disable the overrun error interrupt */ + regmap_write(dd->regmap, PDMIC_IDR, PDMIC_IDR_OVRE); + + clk_disable_unprepare(dd->gclk); + clk_disable_unprepare(dd->pclk); +} + +static int atmel_pdmic_cpu_dai_prepare(struct snd_pcm_substream *substream, + struct snd_soc_dai *cpu_dai) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card); + struct snd_soc_component *component = cpu_dai->component; + u32 val; + int ret; + + /* Clean the PDMIC Converted Data Register */ + ret = regmap_read(dd->regmap, PDMIC_CDR, &val); + if (ret < 0) + return 0; + + ret = snd_soc_component_update_bits(component, PDMIC_CR, + PDMIC_CR_ENPDM_MASK, + PDMIC_CR_ENPDM_DIS << + PDMIC_CR_ENPDM_SHIFT); + if (ret < 0) + return ret; + + return 0; +} + +#define ATMEL_PDMIC_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE) + +/* platform */ +#define ATMEL_PDMIC_MAX_BUF_SIZE (64 * 1024) +#define ATMEL_PDMIC_PREALLOC_BUF_SIZE ATMEL_PDMIC_MAX_BUF_SIZE + +static const struct snd_pcm_hardware atmel_pdmic_hw = { + .info = SNDRV_PCM_INFO_MMAP + | SNDRV_PCM_INFO_MMAP_VALID + | SNDRV_PCM_INFO_INTERLEAVED + | SNDRV_PCM_INFO_RESUME + | SNDRV_PCM_INFO_PAUSE, + .formats = ATMEL_PDMIC_FORMATS, + .buffer_bytes_max = ATMEL_PDMIC_MAX_BUF_SIZE, + .period_bytes_min = 256, + .period_bytes_max = 32 * 1024, + .periods_min = 2, + .periods_max = 256, +}; + +static int +atmel_pdmic_platform_configure_dma(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct dma_slave_config *slave_config) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card); + int ret; + + ret = snd_hwparams_to_dma_slave_config(substream, params, + slave_config); + if (ret) { + dev_err(dd->dev, + "hw params to dma slave configure failed\n"); + return ret; + } + + slave_config->src_addr = dd->phy_base + PDMIC_CDR; + slave_config->src_maxburst = 1; + slave_config->dst_maxburst = 1; + + return 0; +} + +static const struct snd_dmaengine_pcm_config +atmel_pdmic_dmaengine_pcm_config = { + .prepare_slave_config = atmel_pdmic_platform_configure_dma, + .pcm_hardware = &atmel_pdmic_hw, + .prealloc_buffer_size = ATMEL_PDMIC_PREALLOC_BUF_SIZE, +}; + +/* codec */ +/* Mic Gain = dgain * 2^(-scale) */ +struct mic_gain { + unsigned int dgain; + unsigned int scale; +}; + +/* range from -90 dB to 90 dB */ +static const struct mic_gain mic_gain_table[] = { +{ 1, 15}, { 1, 14}, /* -90, -84 dB */ +{ 3, 15}, { 1, 13}, { 3, 14}, { 1, 12}, /* -81, -78, -75, -72 dB */ +{ 5, 14}, { 13, 15}, /* -70, -68 dB */ +{ 9, 14}, { 21, 15}, { 23, 15}, { 13, 14}, /* -65 ~ -62 dB */ +{ 29, 15}, { 33, 15}, { 37, 15}, { 41, 15}, /* -61 ~ -58 dB */ +{ 23, 14}, { 13, 13}, { 58, 15}, { 65, 15}, /* -57 ~ -54 dB */ +{ 73, 15}, { 41, 14}, { 23, 13}, { 13, 12}, /* -53 ~ -50 dB */ +{ 29, 13}, { 65, 14}, { 73, 14}, { 41, 13}, /* -49 ~ -46 dB */ +{ 23, 12}, { 207, 15}, { 29, 12}, { 65, 13}, /* -45 ~ -42 dB */ +{ 73, 13}, { 41, 12}, { 23, 11}, { 413, 15}, /* -41 ~ -38 dB */ +{ 463, 15}, { 519, 15}, { 583, 15}, { 327, 14}, /* -37 ~ -34 dB */ +{ 367, 14}, { 823, 15}, { 231, 13}, { 1036, 15}, /* -33 ~ -30 dB */ +{ 1163, 15}, { 1305, 15}, { 183, 12}, { 1642, 15}, /* -29 ~ -26 dB */ +{ 1843, 15}, { 2068, 15}, { 145, 11}, { 2603, 15}, /* -25 ~ -22 dB */ +{ 365, 12}, { 3277, 15}, { 3677, 15}, { 4125, 15}, /* -21 ~ -18 dB */ +{ 4629, 15}, { 5193, 15}, { 5827, 15}, { 3269, 14}, /* -17 ~ -14 dB */ +{ 917, 12}, { 8231, 15}, { 9235, 15}, { 5181, 14}, /* -13 ~ -10 dB */ +{11627, 15}, {13045, 15}, {14637, 15}, {16423, 15}, /* -9 ~ -6 dB */ +{18427, 15}, {20675, 15}, { 5799, 13}, {26029, 15}, /* -5 ~ -2 dB */ +{ 7301, 13}, { 1, 0}, {18383, 14}, {10313, 13}, /* -1 ~ 2 dB */ +{23143, 14}, {25967, 14}, {29135, 14}, {16345, 13}, /* 3 ~ 6 dB */ +{ 4585, 11}, {20577, 13}, { 1443, 9}, {25905, 13}, /* 7 ~ 10 dB */ +{14533, 12}, { 8153, 11}, { 2287, 9}, {20529, 12}, /* 11 ~ 14 dB */ +{11517, 11}, { 6461, 10}, {28997, 12}, { 4067, 9}, /* 15 ~ 18 dB */ +{18253, 11}, { 10, 0}, {22979, 11}, {25783, 11}, /* 19 ~ 22 dB */ +{28929, 11}, {32459, 11}, { 9105, 9}, {20431, 10}, /* 23 ~ 26 dB */ +{22925, 10}, {12861, 9}, { 7215, 8}, {16191, 9}, /* 27 ~ 30 dB */ +{ 9083, 8}, {20383, 9}, {11435, 8}, { 6145, 7}, /* 31 ~ 34 dB */ +{ 3599, 6}, {32305, 9}, {18123, 8}, {20335, 8}, /* 35 ~ 38 dB */ +{ 713, 3}, { 100, 0}, { 7181, 6}, { 8057, 6}, /* 39 ~ 42 dB */ +{ 565, 2}, {20287, 7}, {11381, 6}, {25539, 7}, /* 43 ~ 46 dB */ +{ 1791, 3}, { 4019, 4}, { 9019, 5}, {20239, 6}, /* 47 ~ 50 dB */ +{ 5677, 4}, {25479, 6}, { 7147, 4}, { 8019, 4}, /* 51 ~ 54 dB */ +{17995, 5}, {20191, 5}, {11327, 4}, {12709, 4}, /* 55 ~ 58 dB */ +{ 3565, 2}, { 1000, 0}, { 1122, 0}, { 1259, 0}, /* 59 ~ 62 dB */ +{ 2825, 1}, {12679, 3}, { 7113, 2}, { 7981, 2}, /* 63 ~ 66 dB */ +{ 8955, 2}, {20095, 3}, {22547, 3}, {12649, 2}, /* 67 ~ 70 dB */ +{28385, 3}, { 3981, 0}, {17867, 2}, {20047, 2}, /* 71 ~ 74 dB */ +{11247, 1}, {12619, 1}, {14159, 1}, {31773, 2}, /* 75 ~ 78 dB */ +{17825, 1}, {10000, 0}, {11220, 0}, {12589, 0}, /* 79 ~ 82 dB */ +{28251, 1}, {15849, 0}, {17783, 0}, {19953, 0}, /* 83 ~ 86 dB */ +{22387, 0}, {25119, 0}, {28184, 0}, {31623, 0}, /* 87 ~ 90 dB */ +}; + +static const DECLARE_TLV_DB_RANGE(mic_gain_tlv, + 0, 1, TLV_DB_SCALE_ITEM(-9000, 600, 0), + 2, 5, TLV_DB_SCALE_ITEM(-8100, 300, 0), + 6, 7, TLV_DB_SCALE_ITEM(-7000, 200, 0), + 8, ARRAY_SIZE(mic_gain_table)-1, TLV_DB_SCALE_ITEM(-6500, 100, 0), +); + +static int pdmic_get_mic_volsw(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol); + unsigned int dgain_val, scale_val; + int i; + + dgain_val = (snd_soc_component_read(component, PDMIC_DSPR1) & PDMIC_DSPR1_DGAIN_MASK) + >> PDMIC_DSPR1_DGAIN_SHIFT; + + scale_val = (snd_soc_component_read(component, PDMIC_DSPR0) & PDMIC_DSPR0_SCALE_MASK) + >> PDMIC_DSPR0_SCALE_SHIFT; + + for (i = 0; i < ARRAY_SIZE(mic_gain_table); i++) { + if ((mic_gain_table[i].dgain == dgain_val) && + (mic_gain_table[i].scale == scale_val)) + ucontrol->value.integer.value[0] = i; + } + + return 0; +} + +static int pdmic_put_mic_volsw(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct soc_mixer_control *mc = + (struct soc_mixer_control *)kcontrol->private_value; + struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol); + int max = mc->max; + unsigned int val; + int ret; + + val = ucontrol->value.integer.value[0]; + + if (val > max) + return -EINVAL; + + ret = snd_soc_component_update_bits(component, PDMIC_DSPR1, PDMIC_DSPR1_DGAIN_MASK, + mic_gain_table[val].dgain << PDMIC_DSPR1_DGAIN_SHIFT); + if (ret < 0) + return ret; + + ret = snd_soc_component_update_bits(component, PDMIC_DSPR0, PDMIC_DSPR0_SCALE_MASK, + mic_gain_table[val].scale << PDMIC_DSPR0_SCALE_SHIFT); + if (ret < 0) + return ret; + + return 0; +} + +static const struct snd_kcontrol_new atmel_pdmic_snd_controls[] = { +SOC_SINGLE_EXT_TLV("Mic Capture Volume", PDMIC_DSPR1, PDMIC_DSPR1_DGAIN_SHIFT, + ARRAY_SIZE(mic_gain_table)-1, 0, + pdmic_get_mic_volsw, pdmic_put_mic_volsw, mic_gain_tlv), + +SOC_SINGLE("High Pass Filter Switch", PDMIC_DSPR0, + PDMIC_DSPR0_HPFBYP_SHIFT, 1, 1), + +SOC_SINGLE("SINCC Filter Switch", PDMIC_DSPR0, PDMIC_DSPR0_SINBYP_SHIFT, 1, 1), +}; + +static int atmel_pdmic_component_probe(struct snd_soc_component *component) +{ + struct snd_soc_card *card = snd_soc_component_get_drvdata(component); + struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card); + + snd_soc_component_update_bits(component, PDMIC_DSPR1, PDMIC_DSPR1_OFFSET_MASK, + (u32)(dd->pdata->mic_offset << PDMIC_DSPR1_OFFSET_SHIFT)); + + return 0; +} + +#define PDMIC_MR_PRESCAL_MAX_VAL 127 + +static int +atmel_pdmic_cpu_dai_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *cpu_dai) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card); + struct snd_soc_component *component = cpu_dai->component; + unsigned int rate_min = substream->runtime->hw.rate_min; + unsigned int rate_max = substream->runtime->hw.rate_max; + int fs = params_rate(params); + int bits = params_width(params); + unsigned long pclk_rate, gclk_rate; + unsigned int f_pdmic; + u32 mr_val, dspr0_val, pclk_prescal, gclk_prescal; + + if (params_channels(params) != 1) { + dev_err(component->dev, + "only supports one channel\n"); + return -EINVAL; + } + + if ((fs < rate_min) || (fs > rate_max)) { + dev_err(component->dev, + "sample rate is %dHz, min rate is %dHz, max rate is %dHz\n", + fs, rate_min, rate_max); + + return -EINVAL; + } + + switch (bits) { + case 16: + dspr0_val = (PDMIC_DSPR0_SIZE_16_BITS + << PDMIC_DSPR0_SIZE_SHIFT); + break; + case 32: + dspr0_val = (PDMIC_DSPR0_SIZE_32_BITS + << PDMIC_DSPR0_SIZE_SHIFT); + break; + default: + return -EINVAL; + } + + if ((fs << 7) > (rate_max << 6)) { + f_pdmic = fs << 6; + dspr0_val |= PDMIC_DSPR0_OSR_64 << PDMIC_DSPR0_OSR_SHIFT; + } else { + f_pdmic = fs << 7; + dspr0_val |= PDMIC_DSPR0_OSR_128 << PDMIC_DSPR0_OSR_SHIFT; + } + + pclk_rate = clk_get_rate(dd->pclk); + gclk_rate = clk_get_rate(dd->gclk); + + /* PRESCAL = SELCK/(2*f_pdmic) - 1*/ + pclk_prescal = (u32)(pclk_rate/(f_pdmic << 1)) - 1; + gclk_prescal = (u32)(gclk_rate/(f_pdmic << 1)) - 1; + + if ((pclk_prescal > PDMIC_MR_PRESCAL_MAX_VAL) || + (gclk_rate/((gclk_prescal + 1) << 1) < + pclk_rate/((pclk_prescal + 1) << 1))) { + mr_val = gclk_prescal << PDMIC_MR_PRESCAL_SHIFT; + mr_val |= PDMIC_MR_CLKS_GCK << PDMIC_MR_CLKS_SHIFT; + } else { + mr_val = pclk_prescal << PDMIC_MR_PRESCAL_SHIFT; + mr_val |= PDMIC_MR_CLKS_PCK << PDMIC_MR_CLKS_SHIFT; + } + + snd_soc_component_update_bits(component, PDMIC_MR, + PDMIC_MR_PRESCAL_MASK | PDMIC_MR_CLKS_MASK, mr_val); + + snd_soc_component_update_bits(component, PDMIC_DSPR0, + PDMIC_DSPR0_OSR_MASK | PDMIC_DSPR0_SIZE_MASK, dspr0_val); + + return 0; +} + +static int atmel_pdmic_cpu_dai_trigger(struct snd_pcm_substream *substream, + int cmd, struct snd_soc_dai *cpu_dai) +{ + struct snd_soc_component *component = cpu_dai->component; + u32 val; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + val = PDMIC_CR_ENPDM_EN << PDMIC_CR_ENPDM_SHIFT; + break; + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + val = PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT; + break; + default: + return -EINVAL; + } + + snd_soc_component_update_bits(component, PDMIC_CR, PDMIC_CR_ENPDM_MASK, val); + + return 0; +} + +static const struct snd_soc_dai_ops atmel_pdmic_cpu_dai_ops = { + .startup = atmel_pdmic_cpu_dai_startup, + .shutdown = atmel_pdmic_cpu_dai_shutdown, + .prepare = atmel_pdmic_cpu_dai_prepare, + .hw_params = atmel_pdmic_cpu_dai_hw_params, + .trigger = atmel_pdmic_cpu_dai_trigger, +}; + + +static struct snd_soc_dai_driver atmel_pdmic_cpu_dai = { + .capture = { + .stream_name = "Capture", + .channels_min = 1, + .channels_max = 1, + .rates = SNDRV_PCM_RATE_KNOT, + .formats = ATMEL_PDMIC_FORMATS, + }, + .ops = &atmel_pdmic_cpu_dai_ops, +}; + +static const struct snd_soc_component_driver atmel_pdmic_cpu_dai_component = { + .name = "atmel-pdmic", + .probe = atmel_pdmic_component_probe, + .controls = atmel_pdmic_snd_controls, + .num_controls = ARRAY_SIZE(atmel_pdmic_snd_controls), + .idle_bias_on = 1, + .use_pmdown_time = 1, +}; + +/* ASoC sound card */ +static int atmel_pdmic_asoc_card_init(struct device *dev, + struct snd_soc_card *card) +{ + struct snd_soc_dai_link *dai_link; + struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card); + struct snd_soc_dai_link_component *comp; + + dai_link = devm_kzalloc(dev, sizeof(*dai_link), GFP_KERNEL); + if (!dai_link) + return -ENOMEM; + + comp = devm_kzalloc(dev, 3 * sizeof(*comp), GFP_KERNEL); + if (!comp) + return -ENOMEM; + + dai_link->cpus = &comp[0]; + dai_link->codecs = &comp[1]; + dai_link->platforms = &comp[2]; + + dai_link->num_cpus = 1; + dai_link->num_codecs = 1; + dai_link->num_platforms = 1; + + dai_link->name = "PDMIC"; + dai_link->stream_name = "PDMIC PCM"; + dai_link->codecs->dai_name = "snd-soc-dummy-dai"; + dai_link->cpus->dai_name = dev_name(dev); + dai_link->codecs->name = "snd-soc-dummy"; + dai_link->platforms->name = dev_name(dev); + + card->dai_link = dai_link; + card->num_links = 1; + card->name = dd->pdata->card_name; + card->dev = dev; + + return 0; +} + +static void atmel_pdmic_get_sample_rate(struct atmel_pdmic *dd, + unsigned int *rate_min, unsigned int *rate_max) +{ + u32 mic_min_freq = dd->pdata->mic_min_freq; + u32 mic_max_freq = dd->pdata->mic_max_freq; + u32 clk_max_rate = (u32)(clk_get_rate(dd->pclk) >> 1); + u32 clk_min_rate = (u32)(clk_get_rate(dd->gclk) >> 8); + + if (mic_max_freq > clk_max_rate) + mic_max_freq = clk_max_rate; + + if (mic_min_freq < clk_min_rate) + mic_min_freq = clk_min_rate; + + *rate_min = DIV_ROUND_CLOSEST(mic_min_freq, 128); + *rate_max = mic_max_freq >> 6; +} + +/* PDMIC interrupt handler */ +static irqreturn_t atmel_pdmic_interrupt(int irq, void *dev_id) +{ + struct atmel_pdmic *dd = (struct atmel_pdmic *)dev_id; + u32 pdmic_isr; + irqreturn_t ret = IRQ_NONE; + + regmap_read(dd->regmap, PDMIC_ISR, &pdmic_isr); + + if (pdmic_isr & PDMIC_ISR_OVRE) { + regmap_update_bits(dd->regmap, PDMIC_CR, PDMIC_CR_ENPDM_MASK, + PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT); + + snd_pcm_stop_xrun(dd->substream); + + ret = IRQ_HANDLED; + } + + return ret; +} + +/* regmap configuration */ +#define ATMEL_PDMIC_REG_MAX 0x124 +static const struct regmap_config atmel_pdmic_regmap_config = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + .max_register = ATMEL_PDMIC_REG_MAX, +}; + +static int atmel_pdmic_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct atmel_pdmic *dd; + struct resource *res; + void __iomem *io_base; + const struct atmel_pdmic_pdata *pdata; + struct snd_soc_card *card; + unsigned int rate_min, rate_max; + int ret; + + pdata = atmel_pdmic_dt_init(dev); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + + dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL); + if (!dd) + return -ENOMEM; + + dd->pdata = pdata; + dd->dev = dev; + + dd->irq = platform_get_irq(pdev, 0); + if (dd->irq < 0) + return dd->irq; + + dd->pclk = devm_clk_get(dev, "pclk"); + if (IS_ERR(dd->pclk)) { + ret = PTR_ERR(dd->pclk); + dev_err(dev, "failed to get peripheral clock: %d\n", ret); + return ret; + } + + dd->gclk = devm_clk_get(dev, "gclk"); + if (IS_ERR(dd->gclk)) { + ret = PTR_ERR(dd->gclk); + dev_err(dev, "failed to get GCK: %d\n", ret); + return ret; + } + + /* The gclk clock frequency must always be three times + * lower than the pclk clock frequency + */ + ret = clk_set_rate(dd->gclk, clk_get_rate(dd->pclk)/3); + if (ret) { + dev_err(dev, "failed to set GCK clock rate: %d\n", ret); + return ret; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + io_base = devm_ioremap_resource(dev, res); + if (IS_ERR(io_base)) + return PTR_ERR(io_base); + + dd->phy_base = res->start; + + dd->regmap = devm_regmap_init_mmio(dev, io_base, + &atmel_pdmic_regmap_config); + if (IS_ERR(dd->regmap)) { + ret = PTR_ERR(dd->regmap); + dev_err(dev, "failed to init register map: %d\n", ret); + return ret; + } + + ret = devm_request_irq(dev, dd->irq, atmel_pdmic_interrupt, 0, + "PDMIC", (void *)dd); + if (ret < 0) { + dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n", + dd->irq, ret); + return ret; + } + + /* Get the minimal and maximal sample rate that the microphone supports */ + atmel_pdmic_get_sample_rate(dd, &rate_min, &rate_max); + + /* register cpu dai */ + atmel_pdmic_cpu_dai.capture.rate_min = rate_min; + atmel_pdmic_cpu_dai.capture.rate_max = rate_max; + ret = devm_snd_soc_register_component(dev, + &atmel_pdmic_cpu_dai_component, + &atmel_pdmic_cpu_dai, 1); + if (ret) { + dev_err(dev, "could not register CPU DAI: %d\n", ret); + return ret; + } + + /* register platform */ + ret = devm_snd_dmaengine_pcm_register(dev, + &atmel_pdmic_dmaengine_pcm_config, + 0); + if (ret) { + dev_err(dev, "could not register platform: %d\n", ret); + return ret; + } + + /* register sound card */ + card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL); + if (!card) { + ret = -ENOMEM; + goto unregister_codec; + } + + snd_soc_card_set_drvdata(card, dd); + + ret = atmel_pdmic_asoc_card_init(dev, card); + if (ret) { + dev_err(dev, "failed to init sound card: %d\n", ret); + goto unregister_codec; + } + + ret = devm_snd_soc_register_card(dev, card); + if (ret) { + dev_err(dev, "failed to register sound card: %d\n", ret); + goto unregister_codec; + } + + return 0; + +unregister_codec: + return ret; +} + +static int atmel_pdmic_remove(struct platform_device *pdev) +{ + return 0; +} + +static struct platform_driver atmel_pdmic_driver = { + .driver = { + .name = "atmel-pdmic", + .of_match_table = of_match_ptr(atmel_pdmic_of_match), + .pm = &snd_soc_pm_ops, + }, + .probe = atmel_pdmic_probe, + .remove = atmel_pdmic_remove, +}; +module_platform_driver(atmel_pdmic_driver); + +MODULE_DESCRIPTION("Atmel PDMIC driver under ALSA SoC architecture"); +MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>"); +MODULE_LICENSE("GPL v2"); |