[alsa-devel] [PATCH v4 5/7] ASoC: atmel-i2s: add driver for the new Atmel I2S controller

From: Cyrille Pitchen cyrille.pitchen@atmel.com

This patch adds support for the Atmel I2S controller embedded into sama5d2x SoCs.

Signed-off-by: Cyrille Pitchen cyrille.pitchen@atmel.com Signed-off-by: Codrin Ciubotariu codrin.ciubotariu@microchip.com ---

Changes in v4: - treated -EPROBE_DEFER on probe; - replaced ternary operator with if; - return -EINVAL if we don't support the number of audio channels.

sound/soc/atmel/Kconfig | 9 + sound/soc/atmel/Makefile | 2 + sound/soc/atmel/atmel-i2s.c | 765 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 776 insertions(+) create mode 100644 sound/soc/atmel/atmel-i2s.c

diff --git a/sound/soc/atmel/Kconfig b/sound/soc/atmel/Kconfig index dcee145..64b784e 100644 --- a/sound/soc/atmel/Kconfig +++ b/sound/soc/atmel/Kconfig @@ -88,4 +88,13 @@ config SND_ATMEL_SOC_TSE850_PCM5142 help Say Y if you want to add support for the ASoC driver for the Axentia TSE-850 with a PCM5142 codec. + +config SND_ATMEL_SOC_I2S + tristate "Atmel ASoC driver for boards using I2S" + depends on OF && (ARCH_AT91 || COMPILE_TEST) + select SND_SOC_GENERIC_DMAENGINE_PCM + select REGMAP_MMIO + help + Say Y or M if you want to add support for Atmel ASoc driver for boards + using I2S. endif diff --git a/sound/soc/atmel/Makefile b/sound/soc/atmel/Makefile index 4440646..cd87cb4 100644 --- a/sound/soc/atmel/Makefile +++ b/sound/soc/atmel/Makefile @@ -3,10 +3,12 @@ snd-soc-atmel-pcm-pdc-objs := atmel-pcm-pdc.o snd-soc-atmel-pcm-dma-objs := atmel-pcm-dma.o snd-soc-atmel_ssc_dai-objs := atmel_ssc_dai.o +snd-soc-atmel-i2s-objs := atmel-i2s.o

obj-$(CONFIG_SND_ATMEL_SOC_PDC) += snd-soc-atmel-pcm-pdc.o obj-$(CONFIG_SND_ATMEL_SOC_DMA) += snd-soc-atmel-pcm-dma.o obj-$(CONFIG_SND_ATMEL_SOC_SSC) += snd-soc-atmel_ssc_dai.o +obj-$(CONFIG_SND_ATMEL_SOC_I2S) += snd-soc-atmel-i2s.o

# AT91 Machine Support snd-soc-sam9g20-wm8731-objs := sam9g20_wm8731.o diff --git a/sound/soc/atmel/atmel-i2s.c b/sound/soc/atmel/atmel-i2s.c new file mode 100644 index 0000000..5d3b5af --- /dev/null +++ b/sound/soc/atmel/atmel-i2s.c @@ -0,0 +1,765 @@ +/* + * Driver for Atmel I2S controller + * + * Copyright (C) 2015 Atmel Corporation + * + * Author: Cyrille Pitchen cyrille.pitchen@atmel.com + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see http://www.gnu.org/licenses/. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/clk.h> +#include <linux/mfd/syscon.h> + +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/initval.h> +#include <sound/soc.h> +#include <sound/dmaengine_pcm.h> + +#define ATMEL_I2SC_MAX_TDM_CHANNELS 8 + +/* + * ---- I2S Controller Register map ---- + */ +#define ATMEL_I2SC_CR 0x0000 /* Control Register */ +#define ATMEL_I2SC_MR 0x0004 /* Mode Register */ +#define ATMEL_I2SC_SR 0x0008 /* Status Register */ +#define ATMEL_I2SC_SCR 0x000c /* Status Clear Register */ +#define ATMEL_I2SC_SSR 0x0010 /* Status Set Register */ +#define ATMEL_I2SC_IER 0x0014 /* Interrupt Enable Register */ +#define ATMEL_I2SC_IDR 0x0018 /* Interrupt Disable Register */ +#define ATMEL_I2SC_IMR 0x001c /* Interrupt Mask Register */ +#define ATMEL_I2SC_RHR 0x0020 /* Receiver Holding Register */ +#define ATMEL_I2SC_THR 0x0024 /* Transmitter Holding Register */ +#define ATMEL_I2SC_VERSION 0x0028 /* Version Register */ + +/* + * ---- Control Register (Write-only) ---- + */ +#define ATMEL_I2SC_CR_RXEN BIT(0) /* Receiver Enable */ +#define ATMEL_I2SC_CR_RXDIS BIT(1) /* Receiver Disable */ +#define ATMEL_I2SC_CR_CKEN BIT(2) /* Clock Enable */ +#define ATMEL_I2SC_CR_CKDIS BIT(3) /* Clock Disable */ +#define ATMEL_I2SC_CR_TXEN BIT(4) /* Transmitter Enable */ +#define ATMEL_I2SC_CR_TXDIS BIT(5) /* Transmitter Disable */ +#define ATMEL_I2SC_CR_SWRST BIT(7) /* Software Reset */ + +/* + * ---- Mode Register (Read/Write) ---- + */ +#define ATMEL_I2SC_MR_MODE_MASK GENMASK(0, 0) +#define ATMEL_I2SC_MR_MODE_SLAVE (0 << 0) +#define ATMEL_I2SC_MR_MODE_MASTER (1 << 0) + +#define ATMEL_I2SC_MR_DATALENGTH_MASK GENMASK(4, 2) +#define ATMEL_I2SC_MR_DATALENGTH_32_BITS (0 << 2) +#define ATMEL_I2SC_MR_DATALENGTH_24_BITS (1 << 2) +#define ATMEL_I2SC_MR_DATALENGTH_20_BITS (2 << 2) +#define ATMEL_I2SC_MR_DATALENGTH_18_BITS (3 << 2) +#define ATMEL_I2SC_MR_DATALENGTH_16_BITS (4 << 2) +#define ATMEL_I2SC_MR_DATALENGTH_16_BITS_COMPACT (5 << 2) +#define ATMEL_I2SC_MR_DATALENGTH_8_BITS (6 << 2) +#define ATMEL_I2SC_MR_DATALENGTH_8_BITS_COMPACT (7 << 2) + +#define ATMEL_I2SC_MR_FORMAT_MASK GENMASK(7, 6) +#define ATMEL_I2SC_MR_FORMAT_I2S (0 << 6) +#define ATMEL_I2SC_MR_FORMAT_LJ (1 << 6) /* Left Justified */ +#define ATMEL_I2SC_MR_FORMAT_TDM (2 << 6) +#define ATMEL_I2SC_MR_FORMAT_TDMLJ (3 << 6) + +/* Left audio samples duplicated to right audio channel */ +#define ATMEL_I2SC_MR_RXMONO BIT(8) + +/* Receiver uses one DMA channel ... */ +#define ATMEL_I2SC_MR_RXDMA_MASK GENMASK(9, 9) +#define ATMEL_I2SC_MR_RXDMA_SINGLE (0 << 9) /* for all audio channels */ +#define ATMEL_I2SC_MR_RXDMA_MULTIPLE (1 << 9) /* per audio channel */ + +/* I2SDO output of I2SC is internally connected to I2SDI input */ +#define ATMEL_I2SC_MR_RXLOOP BIT(10) + +/* Left audio samples duplicated to right audio channel */ +#define ATMEL_I2SC_MR_TXMONO BIT(12) + +/* Transmitter uses one DMA channel ... */ +#define ATMEL_I2SC_MR_TXDMA_MASK GENMASK(13, 13) +#define ATMEL_I2SC_MR_TXDMA_SINGLE (0 << 13) /* for all audio channels */ +#define ATMEL_I2SC_MR_TXDME_MULTIPLE (1 << 13) /* per audio channel */ + +/* x sample transmitted when underrun */ +#define ATMEL_I2SC_MR_TXSAME_MASK GENMASK(14, 14) +#define ATMEL_I2SC_MR_TXSAME_ZERO (0 << 14) /* Zero sample */ +#define ATMEL_I2SC_MR_TXSAME_PREVIOUS (1 << 14) /* Previous sample */ + +/* Audio Clock to I2SC Master Clock ratio */ +#define ATMEL_I2SC_MR_IMCKDIV_MASK GENMASK(21, 16) +#define ATMEL_I2SC_MR_IMCKDIV(div) \ + (((div) << 16) & ATMEL_I2SC_MR_IMCKDIV_MASK) + +/* Master Clock to fs ratio */ +#define ATMEL_I2SC_MR_IMCKFS_MASK GENMASK(29, 24) +#define ATMEL_I2SC_MR_IMCKFS(fs) \ + (((fs) << 24) & ATMEL_I2SC_MR_IMCKFS_MASK) + +/* Master Clock mode */ +#define ATMEL_I2SC_MR_IMCKMODE_MASK GENMASK(30, 30) +/* 0: No master clock generated (selected clock drives I2SCK pin) */ +#define ATMEL_I2SC_MR_IMCKMODE_I2SCK (0 << 30) +/* 1: master clock generated (internally generated clock drives I2SMCK pin) */ +#define ATMEL_I2SC_MR_IMCKMODE_I2SMCK (1 << 30) + +/* Slot Width */ +/* 0: slot is 32 bits wide for DATALENGTH = 18/20/24 bits. */ +/* 1: slot is 24 bits wide for DATALENGTH = 18/20/24 bits. */ +#define ATMEL_I2SC_MR_IWS BIT(31) + +/* + * ---- Status Registers ---- + */ +#define ATMEL_I2SC_SR_RXEN BIT(0) /* Receiver Enabled */ +#define ATMEL_I2SC_SR_RXRDY BIT(1) /* Receive Ready */ +#define ATMEL_I2SC_SR_RXOR BIT(2) /* Receive Overrun */ + +#define ATMEL_I2SC_SR_TXEN BIT(4) /* Transmitter Enabled */ +#define ATMEL_I2SC_SR_TXRDY BIT(5) /* Transmit Ready */ +#define ATMEL_I2SC_SR_TXUR BIT(6) /* Transmit Underrun */ + +/* Receive Overrun Channel */ +#define ATMEL_I2SC_SR_RXORCH_MASK GENMASK(15, 8) +#define ATMEL_I2SC_SR_RXORCH(ch) (1 << (((ch) & 0x7) + 8)) + +/* Transmit Underrun Channel */ +#define ATMEL_I2SC_SR_TXURCH_MASK GENMASK(27, 20) +#define ATMEL_I2SC_SR_TXURCH(ch) (1 << (((ch) & 0x7) + 20)) + +/* + * ---- Interrupt Enable/Disable/Mask Registers ---- + */ +#define ATMEL_I2SC_INT_RXRDY ATMEL_I2SC_SR_RXRDY +#define ATMEL_I2SC_INT_RXOR ATMEL_I2SC_SR_RXOR +#define ATMEL_I2SC_INT_TXRDY ATMEL_I2SC_SR_TXRDY +#define ATMEL_I2SC_INT_TXUR ATMEL_I2SC_SR_TXUR + +static const struct regmap_config atmel_i2s_regmap_config = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + .max_register = ATMEL_I2SC_VERSION, +}; + +struct atmel_i2s_gck_param { + int fs; + unsigned long mck; + int imckdiv; + int imckfs; +}; + +#define I2S_MCK_12M288 12288000UL +#define I2S_MCK_11M2896 11289600UL + +/* mck = (32 * (imckfs+1) / (imckdiv+1)) * fs */ +static const struct atmel_i2s_gck_param gck_params[] = { + /* mck = 12.288MHz */ + { 8000, I2S_MCK_12M288, 0, 47}, /* mck = 1536 fs */ + { 16000, I2S_MCK_12M288, 1, 47}, /* mck = 768 fs */ + { 24000, I2S_MCK_12M288, 3, 63}, /* mck = 512 fs */ + { 32000, I2S_MCK_12M288, 3, 47}, /* mck = 384 fs */ + { 48000, I2S_MCK_12M288, 7, 63}, /* mck = 256 fs */ + { 64000, I2S_MCK_12M288, 7, 47}, /* mck = 192 fs */ + { 96000, I2S_MCK_12M288, 7, 31}, /* mck = 128 fs */ + {192000, I2S_MCK_12M288, 7, 15}, /* mck = 64 fs */ + + /* mck = 11.2896MHz */ + { 11025, I2S_MCK_11M2896, 1, 63}, /* mck = 1024 fs */ + { 22050, I2S_MCK_11M2896, 3, 63}, /* mck = 512 fs */ + { 44100, I2S_MCK_11M2896, 7, 63}, /* mck = 256 fs */ + { 88200, I2S_MCK_11M2896, 7, 31}, /* mck = 128 fs */ + {176400, I2S_MCK_11M2896, 7, 15}, /* mck = 64 fs */ +}; + +struct atmel_i2s_dev; + +struct atmel_i2s_caps { + int (*mck_init)(struct atmel_i2s_dev *, struct device_node *np); +}; + +struct atmel_i2s_dev { + struct device *dev; + struct regmap *regmap; + struct clk *pclk; + struct clk *gclk; + struct clk *aclk; + struct snd_dmaengine_dai_dma_data playback; + struct snd_dmaengine_dai_dma_data capture; + unsigned int fmt; + const struct atmel_i2s_gck_param *gck_param; + const struct atmel_i2s_caps *caps; +}; + +static irqreturn_t atmel_i2s_interrupt(int irq, void *dev_id) +{ + struct atmel_i2s_dev *dev = dev_id; + unsigned int sr, imr, pending, ch, mask; + irqreturn_t ret = IRQ_NONE; + + regmap_read(dev->regmap, ATMEL_I2SC_SR, &sr); + regmap_read(dev->regmap, ATMEL_I2SC_IMR, &imr); + pending = sr & imr; + + if (!pending) + return IRQ_NONE; + + if (pending & ATMEL_I2SC_INT_RXOR) { + mask = ATMEL_I2SC_SR_RXOR; + + for (ch = 0; ch < ATMEL_I2SC_MAX_TDM_CHANNELS; ++ch) { + if (sr & ATMEL_I2SC_SR_RXORCH(ch)) { + mask |= ATMEL_I2SC_SR_RXORCH(ch); + dev_err(dev->dev, + "RX overrun on channel %d\n", ch); + } + } + regmap_write(dev->regmap, ATMEL_I2SC_SCR, mask); + ret = IRQ_HANDLED; + } + + if (pending & ATMEL_I2SC_INT_TXUR) { + mask = ATMEL_I2SC_SR_TXUR; + + for (ch = 0; ch < ATMEL_I2SC_MAX_TDM_CHANNELS; ++ch) { + if (sr & ATMEL_I2SC_SR_TXURCH(ch)) { + mask |= ATMEL_I2SC_SR_TXURCH(ch); + dev_err(dev->dev, + "TX underrun on channel %d\n", ch); + } + } + regmap_write(dev->regmap, ATMEL_I2SC_SCR, mask); + ret = IRQ_HANDLED; + } + + return ret; +} + +#define ATMEL_I2S_RATES SNDRV_PCM_RATE_8000_192000 + +#define ATMEL_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | \ + SNDRV_PCM_FMTBIT_S16_LE | \ + SNDRV_PCM_FMTBIT_S18_3LE | \ + SNDRV_PCM_FMTBIT_S20_3LE | \ + SNDRV_PCM_FMTBIT_S24_3LE | \ + SNDRV_PCM_FMTBIT_S24_LE | \ + SNDRV_PCM_FMTBIT_S32_LE) + +static int atmel_i2s_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt) +{ + struct atmel_i2s_dev *dev = snd_soc_dai_get_drvdata(dai); + + dev->fmt = fmt; + return 0; +} + +static int atmel_i2s_prepare(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct atmel_i2s_dev *dev = snd_soc_dai_get_drvdata(dai); + bool is_playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK); + unsigned int rhr, sr = 0; + + if (is_playback) { + regmap_read(dev->regmap, ATMEL_I2SC_SR, &sr); + if (sr & ATMEL_I2SC_SR_RXRDY) { + /* + * The RX Ready flag should not be set. However if here, + * we flush (read) the Receive Holding Register to start + * from a clean state. + */ + dev_dbg(dev->dev, "RXRDY is set\n"); + regmap_read(dev->regmap, ATMEL_I2SC_RHR, &rhr); + } + } + + return 0; +} + +static int atmel_i2s_get_gck_param(struct atmel_i2s_dev *dev, int fs) +{ + int i, best; + + if (!dev->gclk || !dev->aclk) { + dev_err(dev->dev, "cannot generate the I2S Master Clock\n"); + return -EINVAL; + } + + /* + * Find the best possible settings to generate the I2S Master Clock + * from the PLL Audio. + */ + dev->gck_param = NULL; + best = INT_MAX; + for (i = 0; i < ARRAY_SIZE(gck_params); ++i) { + const struct atmel_i2s_gck_param *gck_param = &gck_params[i]; + int val = abs(fs - gck_param->fs); + + if (val < best) { + best = val; + dev->gck_param = gck_param; + } + } + + return 0; +} + +static int atmel_i2s_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *dai) +{ + struct atmel_i2s_dev *dev = snd_soc_dai_get_drvdata(dai); + bool is_playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK); + unsigned int mr = 0; + int ret; + + switch (dev->fmt & SND_SOC_DAIFMT_FORMAT_MASK) { + case SND_SOC_DAIFMT_I2S: + mr |= ATMEL_I2SC_MR_FORMAT_I2S; + break; + + default: + dev_err(dev->dev, "unsupported bus format\n"); + return -EINVAL; + } + + switch (dev->fmt & SND_SOC_DAIFMT_MASTER_MASK) { + case SND_SOC_DAIFMT_CBS_CFS: + /* codec is slave, so cpu is master */ + mr |= ATMEL_I2SC_MR_MODE_MASTER; + ret = atmel_i2s_get_gck_param(dev, params_rate(params)); + if (ret) + return ret; + break; + + case SND_SOC_DAIFMT_CBM_CFM: + /* codec is master, so cpu is slave */ + mr |= ATMEL_I2SC_MR_MODE_SLAVE; + dev->gck_param = NULL; + break; + + default: + dev_err(dev->dev, "unsupported master/slave mode\n"); + return -EINVAL; + } + + switch (params_channels(params)) { + case 1: + if (is_playback) + mr |= ATMEL_I2SC_MR_TXMONO; + else + mr |= ATMEL_I2SC_MR_RXMONO; + break; + case 2: + break; + default: + dev_err(dev->dev, "unsupported number of audio channels\n"); + return -EINVAL; + } + + switch (params_format(params)) { + case SNDRV_PCM_FORMAT_S8: + mr |= ATMEL_I2SC_MR_DATALENGTH_8_BITS; + break; + + case SNDRV_PCM_FORMAT_S16_LE: + mr |= ATMEL_I2SC_MR_DATALENGTH_16_BITS; + break; + + case SNDRV_PCM_FORMAT_S18_3LE: + mr |= ATMEL_I2SC_MR_DATALENGTH_18_BITS | ATMEL_I2SC_MR_IWS; + break; + + case SNDRV_PCM_FORMAT_S20_3LE: + mr |= ATMEL_I2SC_MR_DATALENGTH_20_BITS | ATMEL_I2SC_MR_IWS; + break; + + case SNDRV_PCM_FORMAT_S24_3LE: + mr |= ATMEL_I2SC_MR_DATALENGTH_24_BITS | ATMEL_I2SC_MR_IWS; + break; + + case SNDRV_PCM_FORMAT_S24_LE: + mr |= ATMEL_I2SC_MR_DATALENGTH_24_BITS; + break; + + case SNDRV_PCM_FORMAT_S32_LE: + mr |= ATMEL_I2SC_MR_DATALENGTH_32_BITS; + break; + + default: + dev_err(dev->dev, "unsupported size/endianness for audio samples\n"); + return -EINVAL; + } + + return regmap_write(dev->regmap, ATMEL_I2SC_MR, mr); +} + +static int atmel_i2s_switch_mck_generator(struct atmel_i2s_dev *dev, + bool enabled) +{ + unsigned int mr, mr_mask; + unsigned long aclk_rate; + int ret; + + mr = 0; + mr_mask = (ATMEL_I2SC_MR_IMCKDIV_MASK | + ATMEL_I2SC_MR_IMCKFS_MASK | + ATMEL_I2SC_MR_IMCKMODE_MASK); + + if (!enabled) { + /* Disable the I2S Master Clock generator. */ + ret = regmap_write(dev->regmap, ATMEL_I2SC_CR, + ATMEL_I2SC_CR_CKDIS); + if (ret) + return ret; + + /* Reset the I2S Master Clock generator settings. */ + ret = regmap_update_bits(dev->regmap, ATMEL_I2SC_MR, + mr_mask, mr); + if (ret) + return ret; + + /* Disable/unprepare the PMC generated clock. */ + clk_disable_unprepare(dev->gclk); + + /* Disable/unprepare the PLL audio clock. */ + clk_disable_unprepare(dev->aclk); + return 0; + } + + if (!dev->gck_param) + return -EINVAL; + + aclk_rate = dev->gck_param->mck * (dev->gck_param->imckdiv + 1); + + /* Fist change the PLL audio clock frequency ... */ + ret = clk_set_rate(dev->aclk, aclk_rate); + if (ret) + return ret; + + /* + * ... then set the PMC generated clock rate to the very same frequency + * to set the gclk parent to aclk. + */ + ret = clk_set_rate(dev->gclk, aclk_rate); + if (ret) + return ret; + + /* Prepare and enable the PLL audio clock first ... */ + ret = clk_prepare_enable(dev->aclk); + if (ret) + return ret; + + /* ... then prepare and enable the PMC generated clock. */ + ret = clk_prepare_enable(dev->gclk); + if (ret) + return ret; + + /* Update the Mode Register to generate the I2S Master Clock. */ + mr |= ATMEL_I2SC_MR_IMCKDIV(dev->gck_param->imckdiv); + mr |= ATMEL_I2SC_MR_IMCKFS(dev->gck_param->imckfs); + mr |= ATMEL_I2SC_MR_IMCKMODE_I2SMCK; + ret = regmap_update_bits(dev->regmap, ATMEL_I2SC_MR, mr_mask, mr); + if (ret) + return ret; + + /* Finally enable the I2S Master Clock generator. */ + return regmap_write(dev->regmap, ATMEL_I2SC_CR, + ATMEL_I2SC_CR_CKEN); +} + +static int atmel_i2s_trigger(struct snd_pcm_substream *substream, int cmd, + struct snd_soc_dai *dai) +{ + struct atmel_i2s_dev *dev = snd_soc_dai_get_drvdata(dai); + bool is_playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK); + bool is_master, mck_enabled; + unsigned int cr, mr; + int err; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + cr = is_playback ? ATMEL_I2SC_CR_TXEN : ATMEL_I2SC_CR_RXEN; + mck_enabled = true; + break; + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + cr = is_playback ? ATMEL_I2SC_CR_TXDIS : ATMEL_I2SC_CR_RXDIS; + mck_enabled = false; + break; + default: + return -EINVAL; + } + + /* Read the Mode Register to retrieve the master/slave state. */ + err = regmap_read(dev->regmap, ATMEL_I2SC_MR, &mr); + if (err) + return err; + is_master = (mr & ATMEL_I2SC_MR_MODE_MASK) == ATMEL_I2SC_MR_MODE_MASTER; + + /* If master starts, enable the audio clock. */ + if (is_master && mck_enabled) + err = atmel_i2s_switch_mck_generator(dev, true); + if (err) + return err; + + err = regmap_write(dev->regmap, ATMEL_I2SC_CR, cr); + if (err) + return err; + + /* If master stops, disable the audio clock. */ + if (is_master && !mck_enabled) + err = atmel_i2s_switch_mck_generator(dev, false); + + return err; +} + +static const struct snd_soc_dai_ops atmel_i2s_dai_ops = { + .prepare = atmel_i2s_prepare, + .trigger = atmel_i2s_trigger, + .hw_params = atmel_i2s_hw_params, + .set_fmt = atmel_i2s_set_dai_fmt, +}; + +static int atmel_i2s_dai_probe(struct snd_soc_dai *dai) +{ + struct atmel_i2s_dev *dev = snd_soc_dai_get_drvdata(dai); + + snd_soc_dai_init_dma_data(dai, &dev->playback, &dev->capture); + return 0; +} + +static struct snd_soc_dai_driver atmel_i2s_dai = { + .probe = atmel_i2s_dai_probe, + .playback = { + .channels_min = 1, + .channels_max = 2, + .rates = ATMEL_I2S_RATES, + .formats = ATMEL_I2S_FORMATS, + }, + .capture = { + .channels_min = 1, + .channels_max = 2, + .rates = ATMEL_I2S_RATES, + .formats = ATMEL_I2S_FORMATS, + }, + .ops = &atmel_i2s_dai_ops, + .symmetric_rates = 1, +}; + +static const struct snd_soc_component_driver atmel_i2s_component = { + .name = "atmel-i2s", +}; + +static int atmel_i2s_sama5d2_mck_init(struct atmel_i2s_dev *dev, + struct device_node *np) +{ + struct clk *muxclk; + int err; + + if (!dev->gclk) + return 0; + + /* muxclk is optional, so we return error for probe defer only */ + muxclk = devm_clk_get(dev->dev, "muxclk"); + if (IS_ERR(muxclk)) { + err = PTR_ERR(muxclk); + if (err == -EPROBE_DEFER) + return -EPROBE_DEFER; + dev_warn(dev->dev, + "failed to get the I2S clock control: %d\n", err); + return 0; + } + + return clk_set_parent(muxclk, dev->gclk); +} + +static const struct atmel_i2s_caps atmel_i2s_sama5d2_caps = { + .mck_init = atmel_i2s_sama5d2_mck_init, +}; + +static const struct of_device_id atmel_i2s_dt_ids[] = { + { + .compatible = "atmel,sama5d2-i2s", + .data = (void *)&atmel_i2s_sama5d2_caps, + }, + + { /* sentinel */ } +}; + +MODULE_DEVICE_TABLE(of, atmel_i2s_dt_ids); + +static int atmel_i2s_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + const struct of_device_id *match; + struct atmel_i2s_dev *dev; + struct resource *mem; + struct regmap *regmap; + void __iomem *base; + int irq; + int err = -ENXIO; + unsigned int pcm_flags = 0; + unsigned int version; + + /* Get memory for driver data. */ + dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); + if (!dev) + return -ENOMEM; + + /* Get hardware capabilities. */ + match = of_match_node(atmel_i2s_dt_ids, np); + if (match) + dev->caps = match->data; + + /* Map I/O registers. */ + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(&pdev->dev, mem); + if (IS_ERR(base)) + return PTR_ERR(base); + + regmap = devm_regmap_init_mmio(&pdev->dev, base, + &atmel_i2s_regmap_config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + /* Request IRQ. */ + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + err = devm_request_irq(&pdev->dev, irq, atmel_i2s_interrupt, 0, + dev_name(&pdev->dev), dev); + if (err) + return err; + + /* Get the peripheral clock. */ + dev->pclk = devm_clk_get(&pdev->dev, "pclk"); + if (IS_ERR(dev->pclk)) { + err = PTR_ERR(dev->pclk); + dev_err(&pdev->dev, + "failed to get the peripheral clock: %d\n", err); + return err; + } + + /* Get audio clocks to generate the I2S Master Clock (I2S_MCK) */ + dev->aclk = devm_clk_get(&pdev->dev, "aclk"); + dev->gclk = devm_clk_get(&pdev->dev, "gclk"); + if (IS_ERR(dev->aclk) && IS_ERR(dev->gclk)) { + if (PTR_ERR(dev->aclk) == -EPROBE_DEFER || + PTR_ERR(dev->gclk) == -EPROBE_DEFER) + return -EPROBE_DEFER; + /* Master Mode not supported */ + dev->aclk = NULL; + dev->gclk = NULL; + } else if (IS_ERR(dev->gclk)) { + err = PTR_ERR(dev->gclk); + dev_err(&pdev->dev, + "failed to get the PMC generated clock: %d\n", err); + return err; + } else if (IS_ERR(dev->aclk)) { + err = PTR_ERR(dev->aclk); + dev_err(&pdev->dev, + "failed to get the PLL audio clock: %d\n", err); + return err; + } + + dev->dev = &pdev->dev; + dev->regmap = regmap; + platform_set_drvdata(pdev, dev); + + /* Do hardware specific settings to initialize I2S_MCK generator */ + if (dev->caps && dev->caps->mck_init) { + err = dev->caps->mck_init(dev, np); + if (err) + return err; + } + + /* Enable the peripheral clock. */ + err = clk_prepare_enable(dev->pclk); + if (err) + return err; + + /* Get IP version. */ + regmap_read(dev->regmap, ATMEL_I2SC_VERSION, &version); + dev_info(&pdev->dev, "hw version: %#x\n", version); + + /* Enable error interrupts. */ + regmap_write(dev->regmap, ATMEL_I2SC_IER, + ATMEL_I2SC_INT_RXOR | ATMEL_I2SC_INT_TXUR); + + err = devm_snd_soc_register_component(&pdev->dev, + &atmel_i2s_component, + &atmel_i2s_dai, 1); + if (err) { + dev_err(&pdev->dev, "failed to register DAI: %d\n", err); + clk_disable_unprepare(dev->pclk); + return err; + } + + /* Prepare DMA config. */ + dev->playback.addr = (dma_addr_t)mem->start + ATMEL_I2SC_THR; + dev->playback.maxburst = 1; + dev->capture.addr = (dma_addr_t)mem->start + ATMEL_I2SC_RHR; + dev->capture.maxburst = 1; + + if (of_property_match_string(np, "dma-names", "rx-tx") == 0) + pcm_flags |= SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX; + err = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, pcm_flags); + if (err) { + dev_err(&pdev->dev, "failed to register PCM: %d\n", err); + clk_disable_unprepare(dev->pclk); + return err; + } + + return 0; +} + +static int atmel_i2s_remove(struct platform_device *pdev) +{ + struct atmel_i2s_dev *dev = platform_get_drvdata(pdev); + + clk_disable_unprepare(dev->pclk); + + return 0; +} + +static struct platform_driver atmel_i2s_driver = { + .driver = { + .name = "atmel_i2s", + .of_match_table = of_match_ptr(atmel_i2s_dt_ids), + }, + .probe = atmel_i2s_probe, + .remove = atmel_i2s_remove, +}; +module_platform_driver(atmel_i2s_driver); + +MODULE_DESCRIPTION("Atmel I2S Controller driver"); +MODULE_AUTHOR("Cyrille Pitchen cyrille.pitchen@atmel.com"); +MODULE_LICENSE("GPL v2");