@@ -8,6 +8,15 @@ config SND_SUN4I_CODEC
Select Y or M to add support for the Codec embedded in the Allwinner
A10 and affiliated SoCs.
+config SND_SUN4I_I2S
+ tristate "Allwinner A10 I2S Support"
+ select SND_SOC_GENERIC_DMAENGINE_PCM
+ select REGMAP_MMIO
+ help
+ Say Y or M if you want to add support for codecs attached to
+ the Allwinner A10 I2S. You will also need to select the
+ individual machine drivers to support below.
+
config SND_SUN4I_SPDIF
tristate "Allwinner A10 SPDIF Support"
depends on OF
@@ -1,3 +1,3 @@
obj-$(CONFIG_SND_SUN4I_CODEC) += sun4i-codec.o
-
+obj-$(CONFIG_SND_SUN4I_I2S) += sun4i-i2s.o
obj-$(CONFIG_SND_SUN4I_SPDIF) += sun4i-spdif.o
new file mode 100644
@@ -0,0 +1,703 @@
+/*
+ * Copyright (C) 2015 Andrea Venturi
+ * Andrea Venturi <be17068@iperbole.bo.it>
+ *
+ * Copyright (C) 2016 Maxime Ripard
+ * Maxime Ripard <maxime.ripard@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ */
+
+#include <linux/clk.h>
+#include <linux/dmaengine.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dai.h>
+
+#define SUN4I_I2S_CTRL_REG 0x00
+#define SUN4I_I2S_CTRL_SDO_EN_MASK GENMASK(11, 8)
+#define SUN4I_I2S_CTRL_SDO_EN(sdo) BIT(8 + (sdo))
+#define SUN4I_I2S_CTRL_MODE_MASK BIT(5)
+#define SUN4I_I2S_CTRL_MODE_SLAVE (1 << 5)
+#define SUN4I_I2S_CTRL_MODE_MASTER (0 << 5)
+#define SUN4I_I2S_CTRL_TX_EN BIT(2)
+#define SUN4I_I2S_CTRL_RX_EN BIT(1)
+#define SUN4I_I2S_CTRL_GL_EN BIT(0)
+
+#define SUN4I_I2S_FMT0_REG 0x04
+#define SUN4I_I2S_FMT0_LRCLK_POLARITY_MASK BIT(7)
+#define SUN4I_I2S_FMT0_LRCLK_POLARITY_INVERTED (1 << 7)
+#define SUN4I_I2S_FMT0_LRCLK_POLARITY_NORMAL (0 << 7)
+#define SUN4I_I2S_FMT0_BCLK_POLARITY_MASK BIT(6)
+#define SUN4I_I2S_FMT0_BCLK_POLARITY_INVERTED (1 << 6)
+#define SUN4I_I2S_FMT0_BCLK_POLARITY_NORMAL (0 << 6)
+#define SUN4I_I2S_FMT0_SR_MASK GENMASK(5, 4)
+#define SUN4I_I2S_FMT0_SR(sr) ((sr) << 4)
+#define SUN4I_I2S_FMT0_WSS_MASK GENMASK(3, 2)
+#define SUN4I_I2S_FMT0_WSS(wss) ((wss) << 2)
+#define SUN4I_I2S_FMT0_FMT_MASK GENMASK(1, 0)
+#define SUN4I_I2S_FMT0_FMT_RIGHT_J (2 << 0)
+#define SUN4I_I2S_FMT0_FMT_LEFT_J (1 << 0)
+#define SUN4I_I2S_FMT0_FMT_I2S (0 << 0)
+
+#define SUN4I_I2S_FMT1_REG 0x08
+#define SUN4I_I2S_FIFO_TX_REG 0x0c
+#define SUN4I_I2S_FIFO_RX_REG 0x10
+
+#define SUN4I_I2S_FIFO_CTRL_REG 0x14
+#define SUN4I_I2S_FIFO_CTRL_FLUSH_TX BIT(25)
+#define SUN4I_I2S_FIFO_CTRL_FLUSH_RX BIT(24)
+#define SUN4I_I2S_FIFO_CTRL_TX_MODE_MASK BIT(2)
+#define SUN4I_I2S_FIFO_CTRL_TX_MODE(mode) ((mode) << 2)
+#define SUN4I_I2S_FIFO_CTRL_RX_MODE_MASK GENMASK(1, 0)
+#define SUN4I_I2S_FIFO_CTRL_RX_MODE(mode) (mode)
+
+#define SUN4I_I2S_FIFO_STA_REG 0x18
+
+#define SUN4I_I2S_DMA_INT_CTRL_REG 0x1c
+#define SUN4I_I2S_DMA_INT_CTRL_TX_DRQ_EN BIT(7)
+#define SUN4I_I2S_DMA_INT_CTRL_RX_DRQ_EN BIT(3)
+
+#define SUN4I_I2S_INT_STA_REG 0x20
+
+#define SUN4I_I2S_CLK_DIV_REG 0x24
+#define SUN4I_I2S_CLK_DIV_MCLK_EN BIT(7)
+#define SUN4I_I2S_CLK_DIV_BCLK_MASK GENMASK(6, 4)
+#define SUN4I_I2S_CLK_DIV_BCLK(bclk) ((bclk) << 4)
+#define SUN4I_I2S_CLK_DIV_MCLK_MASK GENMASK(3, 0)
+#define SUN4I_I2S_CLK_DIV_MCLK(mclk) ((mclk) << 0)
+
+#define SUN4I_I2S_RX_CNT_REG 0x28
+#define SUN4I_I2S_TX_CNT_REG 0x2c
+
+#define SUN4I_I2S_TX_CHAN_SEL_REG 0x30
+#define SUN4I_I2S_TX_CHAN_SEL(num_chan) (((num_chan) - 1) << 0)
+
+#define SUN4I_I2S_TX_CHAN_MAP_REG 0x34
+#define SUN4I_I2S_TX_CHAN_MAP(chan, sample) ((sample) << (chan << 2))
+
+#define SUN4I_I2S_RX_CHAN_SEL_REG 0x38
+#define SUN4I_I2S_RX_CHAN_MAP_REG 0x3c
+
+struct sun4i_i2s {
+ struct clk *bus_clk;
+ struct clk *mod_clk;
+ struct regmap *regmap;
+
+ struct snd_dmaengine_dai_dma_data playback_dma_data;
+};
+
+struct sun4i_i2s_clk_div {
+ u8 div;
+ u8 val;
+};
+
+static const struct sun4i_i2s_clk_div sun4i_i2s_bclk_div[] = {
+ { .div = 2, .val = 0 },
+ { .div = 4, .val = 1 },
+ { .div = 6, .val = 2 },
+ { .div = 8, .val = 3 },
+ { .div = 12, .val = 4 },
+ { .div = 16, .val = 5 },
+};
+
+static const struct sun4i_i2s_clk_div sun4i_i2s_mclk_div[] = {
+ { .div = 1, .val = 0 },
+ { .div = 2, .val = 1 },
+ { .div = 4, .val = 2 },
+ { .div = 6, .val = 3 },
+ { .div = 8, .val = 4 },
+ { .div = 12, .val = 5 },
+ { .div = 16, .val = 6 },
+ { .div = 24, .val = 7 },
+};
+
+static int sun4i_i2s_get_bclk_div(struct sun4i_i2s *i2s,
+ unsigned int oversample_rate,
+ unsigned int word_size)
+{
+ int div = oversample_rate / word_size / 2;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(sun4i_i2s_bclk_div); i++) {
+ const struct sun4i_i2s_clk_div *bdiv = &sun4i_i2s_bclk_div[i];
+
+ if (bdiv->div == div)
+ return bdiv->val;
+ }
+
+ return -EINVAL;
+}
+
+static int sun4i_i2s_get_mclk_div(struct sun4i_i2s *i2s,
+ unsigned int oversample_rate,
+ unsigned int module_rate,
+ unsigned int sampling_rate)
+{
+ int div = module_rate / sampling_rate / oversample_rate;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(sun4i_i2s_mclk_div); i++) {
+ const struct sun4i_i2s_clk_div *mdiv = &sun4i_i2s_mclk_div[i];
+
+ if (mdiv->div == div)
+ return mdiv->val;
+ }
+
+ return -EINVAL;
+}
+
+static int sun4i_i2s_oversample_rates[] = { 128, 192, 256, 384, 512, 768 };
+
+static int sun4i_i2s_set_clk_rate(struct sun4i_i2s *i2s,
+ unsigned int rate,
+ unsigned int word_size)
+{
+ unsigned int clk_rate;
+ int bclk_div, mclk_div;
+ int ret, i;
+
+ switch (rate) {
+ case 176400:
+ case 88200:
+ case 44100:
+ case 22050:
+ case 11025:
+ clk_rate = 22579200;
+ break;
+
+ case 192000:
+ case 128000:
+ case 96000:
+ case 64000:
+ case 48000:
+ case 32000:
+ case 24000:
+ case 16000:
+ case 12000:
+ case 8000:
+ clk_rate = 24576000;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ ret = clk_set_rate(i2s->mod_clk, clk_rate);
+ if (ret)
+ return ret;
+
+ /* Always favor the highest oversampling rate */
+ for (i = (ARRAY_SIZE(sun4i_i2s_oversample_rates) - 1); i >= 0; i--) {
+ unsigned int oversample_rate = sun4i_i2s_oversample_rates[i];
+
+ bclk_div = sun4i_i2s_get_bclk_div(i2s, oversample_rate,
+ word_size);
+ mclk_div = sun4i_i2s_get_mclk_div(i2s, oversample_rate,
+ clk_rate,
+ rate);
+
+ if ((bclk_div >= 0) && (mclk_div >= 0))
+ break;
+ }
+
+ if ((bclk_div < 0) || (mclk_div < 0))
+ return -EINVAL;
+
+ regmap_write(i2s->regmap, SUN4I_I2S_CLK_DIV_REG,
+ SUN4I_I2S_CLK_DIV_BCLK(bclk_div) |
+ SUN4I_I2S_CLK_DIV_MCLK(mclk_div) |
+ SUN4I_I2S_CLK_DIV_MCLK_EN);
+
+ return 0;
+}
+
+static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+ int sr, wss;
+ u32 width;
+
+ if (params_channels(params) != 2)
+ return -EINVAL;
+
+ switch (params_physical_width(params)) {
+ case 16:
+ width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ break;
+ default:
+ return -EINVAL;
+ }
+ i2s->playback_dma_data.addr_width = width;
+
+ switch (params_width(params)) {
+ case 16:
+ sr = 0;
+ wss = 0;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ regmap_update_bits(i2s->regmap, SUN4I_I2S_FMT0_REG,
+ SUN4I_I2S_FMT0_WSS_MASK | SUN4I_I2S_FMT0_SR_MASK,
+ SUN4I_I2S_FMT0_WSS(wss) | SUN4I_I2S_FMT0_SR(sr));
+
+ return sun4i_i2s_set_clk_rate(i2s, params_rate(params),
+ params_width(params));
+}
+
+static int sun4i_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+ struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+ u32 val;
+
+ /* DAI Mode */
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_I2S:
+ val = SUN4I_I2S_FMT0_FMT_I2S;
+ break;
+ case SND_SOC_DAIFMT_LEFT_J:
+ val = SUN4I_I2S_FMT0_FMT_LEFT_J;
+ break;
+ case SND_SOC_DAIFMT_RIGHT_J:
+ val = SUN4I_I2S_FMT0_FMT_RIGHT_J;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ regmap_update_bits(i2s->regmap, SUN4I_I2S_FMT0_REG,
+ SUN4I_I2S_FMT0_FMT_MASK,
+ val);
+
+ /* DAI clock polarity */
+ switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+ case SND_SOC_DAIFMT_IB_IF:
+ /* Invert both clocks */
+ val = SUN4I_I2S_FMT0_BCLK_POLARITY_INVERTED |
+ SUN4I_I2S_FMT0_LRCLK_POLARITY_INVERTED;
+ break;
+ case SND_SOC_DAIFMT_IB_NF:
+ /* Invert bit clock */
+ val = SUN4I_I2S_FMT0_BCLK_POLARITY_INVERTED |
+ SUN4I_I2S_FMT0_LRCLK_POLARITY_NORMAL;
+ break;
+ case SND_SOC_DAIFMT_NB_IF:
+ /* Invert frame clock */
+ val = SUN4I_I2S_FMT0_LRCLK_POLARITY_INVERTED |
+ SUN4I_I2S_FMT0_BCLK_POLARITY_NORMAL;
+ break;
+ case SND_SOC_DAIFMT_NB_NF:
+ /* Nothing to do for both normal cases */
+ val = SUN4I_I2S_FMT0_BCLK_POLARITY_NORMAL |
+ SUN4I_I2S_FMT0_LRCLK_POLARITY_NORMAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ regmap_update_bits(i2s->regmap, SUN4I_I2S_FMT0_REG,
+ SUN4I_I2S_FMT0_BCLK_POLARITY_MASK |
+ SUN4I_I2S_FMT0_LRCLK_POLARITY_MASK,
+ val);
+
+ /* DAI clock master masks */
+ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBS_CFS:
+ /* BCLK and LRCLK master */
+ val = SUN4I_I2S_CTRL_MODE_MASTER;
+ break;
+ case SND_SOC_DAIFMT_CBM_CFM:
+ /* BCLK and LRCLK slave */
+ val = SUN4I_I2S_CTRL_MODE_SLAVE;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG,
+ SUN4I_I2S_CTRL_MODE_MASK,
+ val);
+
+ /* Set significant bits in our FIFOs */
+ regmap_update_bits(i2s->regmap, SUN4I_I2S_FIFO_CTRL_REG,
+ SUN4I_I2S_FIFO_CTRL_TX_MODE_MASK |
+ SUN4I_I2S_FIFO_CTRL_RX_MODE_MASK,
+ SUN4I_I2S_FIFO_CTRL_TX_MODE(1) |
+ SUN4I_I2S_FIFO_CTRL_RX_MODE(1));
+ return 0;
+}
+
+static void sun4i_i2s_start_playback(struct sun4i_i2s *i2s)
+{
+ /* Flush TX FIFO */
+ regmap_update_bits(i2s->regmap, SUN4I_I2S_FIFO_CTRL_REG,
+ SUN4I_I2S_FIFO_CTRL_FLUSH_TX,
+ SUN4I_I2S_FIFO_CTRL_FLUSH_TX);
+
+ /* Clear TX counter */
+ regmap_write(i2s->regmap, SUN4I_I2S_TX_CNT_REG, 0);
+
+ /* Enable TX Block */
+ regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG,
+ SUN4I_I2S_CTRL_TX_EN,
+ SUN4I_I2S_CTRL_TX_EN);
+
+ /* Enable TX DRQ */
+ regmap_update_bits(i2s->regmap, SUN4I_I2S_DMA_INT_CTRL_REG,
+ SUN4I_I2S_DMA_INT_CTRL_TX_DRQ_EN,
+ SUN4I_I2S_DMA_INT_CTRL_TX_DRQ_EN);
+}
+
+
+static void sun4i_i2s_stop_playback(struct sun4i_i2s *i2s)
+{
+ /* Disable TX Block */
+ regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG,
+ SUN4I_I2S_CTRL_TX_EN,
+ 0);
+
+ /* Disable TX DRQ */
+ regmap_update_bits(i2s->regmap, SUN4I_I2S_DMA_INT_CTRL_REG,
+ SUN4I_I2S_DMA_INT_CTRL_TX_DRQ_EN,
+ 0);
+}
+
+static int sun4i_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ sun4i_i2s_start_playback(i2s);
+ else
+ return -EINVAL;
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ sun4i_i2s_stop_playback(i2s);
+ else
+ return -EINVAL;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int sun4i_i2s_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+ /* Enable the whole hardware block */
+ regmap_write(i2s->regmap, SUN4I_I2S_CTRL_REG,
+ SUN4I_I2S_CTRL_GL_EN);
+
+ /* Enable the first output line */
+ regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG,
+ SUN4I_I2S_CTRL_SDO_EN_MASK,
+ SUN4I_I2S_CTRL_SDO_EN(0));
+
+ /* Enable the first two channels */
+ regmap_write(i2s->regmap, SUN4I_I2S_TX_CHAN_SEL_REG,
+ SUN4I_I2S_TX_CHAN_SEL(2));
+
+ /* Map them to the two first samples coming in */
+ regmap_write(i2s->regmap, SUN4I_I2S_TX_CHAN_MAP_REG,
+ SUN4I_I2S_TX_CHAN_MAP(0, 0) | SUN4I_I2S_TX_CHAN_MAP(1, 1));
+
+ return clk_prepare_enable(i2s->mod_clk);
+}
+
+static void sun4i_i2s_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+ clk_disable_unprepare(i2s->mod_clk);
+
+ /* Disable our output lines */
+ regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG,
+ SUN4I_I2S_CTRL_SDO_EN_MASK, 0);
+
+ /* Disable the whole hardware block */
+ regmap_write(i2s->regmap, SUN4I_I2S_CTRL_REG, 0);
+}
+
+static const struct snd_soc_dai_ops sun4i_i2s_dai_ops = {
+ .hw_params = sun4i_i2s_hw_params,
+ .set_fmt = sun4i_i2s_set_fmt,
+ .shutdown = sun4i_i2s_shutdown,
+ .startup = sun4i_i2s_startup,
+ .trigger = sun4i_i2s_trigger,
+};
+
+static int sun4i_i2s_dai_probe(struct snd_soc_dai *dai)
+{
+ struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+ snd_soc_dai_init_dma_data(dai, &i2s->playback_dma_data, NULL);
+
+ snd_soc_dai_set_drvdata(dai, i2s);
+
+ return 0;
+}
+
+static struct snd_soc_dai_driver sun4i_i2s_dai = {
+ .probe = sun4i_i2s_dai_probe,
+ .playback = {
+ .stream_name = "Playback",
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_192000,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ },
+ .ops = &sun4i_i2s_dai_ops,
+ .symmetric_rates = 1,
+};
+
+static const struct snd_soc_component_driver sun4i_i2s_component = {
+ .name = "sun4i-dai",
+};
+
+static bool sun4i_i2s_rd_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case SUN4I_I2S_FIFO_TX_REG:
+ return false;
+
+ default:
+ return true;
+ }
+}
+
+static bool sun4i_i2s_wr_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case SUN4I_I2S_FIFO_RX_REG:
+ case SUN4I_I2S_FIFO_STA_REG:
+ return false;
+
+ default:
+ return true;
+ }
+}
+
+static bool sun4i_i2s_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case SUN4I_I2S_FIFO_RX_REG:
+ case SUN4I_I2S_INT_STA_REG:
+ case SUN4I_I2S_RX_CNT_REG:
+ case SUN4I_I2S_TX_CNT_REG:
+ return true;
+
+ default:
+ return false;
+ }
+}
+
+static const struct reg_default sun4i_i2s_reg_defaults[] = {
+ { SUN4I_I2S_CTRL_REG, 0x00000000 },
+ { SUN4I_I2S_FMT0_REG, 0x0000000c },
+ { SUN4I_I2S_FMT1_REG, 0x00004020 },
+ { SUN4I_I2S_FIFO_CTRL_REG, 0x000400f0 },
+ { SUN4I_I2S_DMA_INT_CTRL_REG, 0x00000000 },
+ { SUN4I_I2S_CLK_DIV_REG, 0x00000000 },
+ { SUN4I_I2S_TX_CHAN_SEL_REG, 0x00000001 },
+ { SUN4I_I2S_TX_CHAN_MAP_REG, 0x76543210 },
+ { SUN4I_I2S_RX_CHAN_SEL_REG, 0x00000001 },
+ { SUN4I_I2S_RX_CHAN_MAP_REG, 0x00003210 },
+};
+
+static const struct regmap_config sun4i_i2s_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = SUN4I_I2S_RX_CHAN_MAP_REG,
+
+ .cache_type = REGCACHE_FLAT,
+ .reg_defaults = sun4i_i2s_reg_defaults,
+ .num_reg_defaults = ARRAY_SIZE(sun4i_i2s_reg_defaults),
+ .writeable_reg = sun4i_i2s_wr_reg,
+ .readable_reg = sun4i_i2s_rd_reg,
+ .volatile_reg = sun4i_i2s_volatile_reg,
+};
+
+static int sun4i_i2s_runtime_resume(struct device *dev)
+{
+ struct sun4i_i2s *i2s = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_prepare_enable(i2s->bus_clk);
+ if (ret) {
+ dev_err(dev, "Failed to enable bus clock\n");
+ return ret;
+ }
+
+ regcache_cache_only(i2s->regmap, false);
+ regcache_mark_dirty(i2s->regmap);
+
+ ret = regcache_sync(i2s->regmap);
+ if (ret) {
+ dev_err(dev, "Failed to sync regmap cache\n");
+ goto err_disable_clk;
+ }
+
+ return 0;
+
+err_disable_clk:
+ clk_disable_unprepare(i2s->bus_clk);
+ return ret;
+}
+
+static int sun4i_i2s_runtime_suspend(struct device *dev)
+{
+ struct sun4i_i2s *i2s = dev_get_drvdata(dev);
+
+ regcache_cache_only(i2s->regmap, true);
+
+ clk_disable_unprepare(i2s->bus_clk);
+
+ return 0;
+}
+
+static int sun4i_i2s_probe(struct platform_device *pdev)
+{
+ struct sun4i_i2s *i2s;
+ struct resource *res;
+ void __iomem *regs;
+ int irq, ret;
+
+ i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL);
+ if (!i2s)
+ return -ENOMEM;
+ platform_set_drvdata(pdev, i2s);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(regs)) {
+ dev_err(&pdev->dev, "Can't request IO region\n");
+ return PTR_ERR(regs);
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(&pdev->dev, "Can't retrieve our interrupt\n");
+ return irq;
+ }
+
+ i2s->bus_clk = devm_clk_get(&pdev->dev, "apb");
+ if (IS_ERR(i2s->bus_clk)) {
+ dev_err(&pdev->dev, "Can't get our bus clock\n");
+ return PTR_ERR(i2s->bus_clk);
+ }
+
+ i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
+ &sun4i_i2s_regmap_config);
+ if (IS_ERR(i2s->regmap)) {
+ dev_err(&pdev->dev, "Regmap initialisation failed\n");
+ return PTR_ERR(i2s->regmap);
+ };
+
+ i2s->mod_clk = devm_clk_get(&pdev->dev, "mod");
+ if (IS_ERR(i2s->mod_clk)) {
+ dev_err(&pdev->dev, "Can't get our mod clock\n");
+ return PTR_ERR(i2s->mod_clk);
+ }
+
+ i2s->playback_dma_data.addr = res->start + SUN4I_I2S_FIFO_TX_REG;
+ i2s->playback_dma_data.maxburst = 4;
+
+ pm_runtime_enable(&pdev->dev);
+ if (!pm_runtime_enabled(&pdev->dev)) {
+ ret = sun4i_i2s_runtime_resume(&pdev->dev);
+ if (ret)
+ goto err_pm_disable;
+ }
+
+ ret = devm_snd_soc_register_component(&pdev->dev,
+ &sun4i_i2s_component,
+ &sun4i_i2s_dai, 1);
+ if (ret) {
+ dev_err(&pdev->dev, "Could not register DAI\n");
+ goto err_suspend;
+ }
+
+ ret = snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+ if (ret) {
+ dev_err(&pdev->dev, "Could not register PCM\n");
+ goto err_suspend;
+ }
+
+ return 0;
+
+err_suspend:
+ if (!pm_runtime_status_suspended(&pdev->dev))
+ sun4i_i2s_runtime_suspend(&pdev->dev);
+err_pm_disable:
+ pm_runtime_disable(&pdev->dev);
+
+ return ret;
+}
+
+static int sun4i_i2s_remove(struct platform_device *pdev)
+{
+ snd_dmaengine_pcm_unregister(&pdev->dev);
+
+ pm_runtime_disable(&pdev->dev);
+ if (!pm_runtime_status_suspended(&pdev->dev))
+ sun4i_i2s_runtime_suspend(&pdev->dev);
+
+ return 0;
+}
+
+static const struct of_device_id sun4i_i2s_match[] = {
+ { .compatible = "allwinner,sun4i-a10-i2s", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, sun4i_i2s_match);
+
+static const struct dev_pm_ops sun4i_i2s_pm_ops = {
+ .runtime_resume = sun4i_i2s_runtime_resume,
+ .runtime_suspend = sun4i_i2s_runtime_suspend,
+};
+
+static struct platform_driver sun4i_i2s_driver = {
+ .probe = sun4i_i2s_probe,
+ .remove = sun4i_i2s_remove,
+ .driver = {
+ .name = "sun4i-i2s",
+ .of_match_table = sun4i_i2s_match,
+ .pm = &sun4i_i2s_pm_ops,
+ },
+};
+module_platform_driver(sun4i_i2s_driver);
+
+MODULE_AUTHOR("Andrea Venturi <be17068@iperbole.bo.it>");
+MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
+MODULE_DESCRIPTION("Allwinner A10 I2S driver");
+MODULE_LICENSE("GPL");
The Allwinner A10 and later come with a hardware block that used for the PCM and I2S interfaces. Add a driver for it in ASoC. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> --- sound/soc/sunxi/Kconfig | 9 + sound/soc/sunxi/Makefile | 2 +- sound/soc/sunxi/sun4i-i2s.c | 703 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 713 insertions(+), 1 deletion(-) create mode 100644 sound/soc/sunxi/sun4i-i2s.c