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From:   Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
To:     paul@crapouillou.net, lgirdwood@gmail.com, broonie@kernel.org,
        perex@perex.cz, tiwai@suse.com
Cc:     linux-mips@vger.kernel.org, alsa-devel@alsa-project.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH v3 02/11] ASoC: jz4740-i2s: Convert to regmap API
Date:   Fri,  8 Jul 2022 11:42:55 +0100
Message-Id: <20220708104304.51415-3-aidanmacdonald.0x0@gmail.com>
In-Reply-To: <20220708104304.51415-1-aidanmacdonald.0x0@gmail.com>
References: <20220708104304.51415-1-aidanmacdonald.0x0@gmail.com>
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Using regmap for accessing the AIC registers makes the driver a
little easier to read, and later refactors can take advantage of
regmap APIs to further simplify the driver.

Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
---
 sound/soc/jz4740/Kconfig      |  1 +
 sound/soc/jz4740/jz4740-i2s.c | 96 +++++++++++++----------------------
 2 files changed, 37 insertions(+), 60 deletions(-)

diff --git a/sound/soc/jz4740/Kconfig b/sound/soc/jz4740/Kconfig
index e72f826062e9..dd3b4507fbe6 100644
--- a/sound/soc/jz4740/Kconfig
+++ b/sound/soc/jz4740/Kconfig
@@ -3,6 +3,7 @@ config SND_JZ4740_SOC_I2S
 	tristate "SoC Audio (I2S protocol) for Ingenic JZ4740 SoC"
 	depends on MIPS || COMPILE_TEST
 	depends on HAS_IOMEM
+	select REGMAP_MMIO
 	select SND_SOC_GENERIC_DMAENGINE_PCM
 	help
 	  Say Y if you want to use I2S protocol and I2S codec on Ingenic JZ4740
diff --git a/sound/soc/jz4740/jz4740-i2s.c b/sound/soc/jz4740/jz4740-i2s.c
index c4c1e89b47c1..69ccec0f09d9 100644
--- a/sound/soc/jz4740/jz4740-i2s.c
+++ b/sound/soc/jz4740/jz4740-i2s.c
@@ -9,6 +9,7 @@
 #include <linux/module.h>
 #include <linux/mod_devicetable.h>
 #include <linux/platform_device.h>
+#include <linux/regmap.h>
 #include <linux/slab.h>
 
 #include <linux/clk.h>
@@ -93,7 +94,7 @@ struct i2s_soc_info {
 };
 
 struct jz4740_i2s {
-	void __iomem *base;
+	struct regmap *regmap;
 
 	struct clk *clk_aic;
 	struct clk *clk_i2s;
@@ -104,40 +105,22 @@ struct jz4740_i2s {
 	const struct i2s_soc_info *soc_info;
 };
 
-static inline uint32_t jz4740_i2s_read(const struct jz4740_i2s *i2s,
-	unsigned int reg)
-{
-	return readl(i2s->base + reg);
-}
-
-static inline void jz4740_i2s_write(const struct jz4740_i2s *i2s,
-	unsigned int reg, uint32_t value)
-{
-	writel(value, i2s->base + reg);
-}
-
 static int jz4740_i2s_startup(struct snd_pcm_substream *substream,
 	struct snd_soc_dai *dai)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
-	uint32_t conf, ctrl;
 	int ret;
 
 	if (snd_soc_dai_active(dai))
 		return 0;
 
-	ctrl = jz4740_i2s_read(i2s, JZ_REG_AIC_CTRL);
-	ctrl |= JZ_AIC_CTRL_FLUSH;
-	jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl);
+	regmap_set_bits(i2s->regmap, JZ_REG_AIC_CTRL, JZ_AIC_CTRL_FLUSH);
 
 	ret = clk_prepare_enable(i2s->clk_i2s);
 	if (ret)
 		return ret;
 
-	conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
-	conf |= JZ_AIC_CONF_ENABLE;
-	jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
-
+	regmap_set_bits(i2s->regmap, JZ_REG_AIC_CONF, JZ_AIC_CONF_ENABLE);
 	return 0;
 }
 
@@ -145,14 +128,11 @@ static void jz4740_i2s_shutdown(struct snd_pcm_substream *substream,
 	struct snd_soc_dai *dai)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
-	uint32_t conf;
 
 	if (snd_soc_dai_active(dai))
 		return;
 
-	conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
-	conf &= ~JZ_AIC_CONF_ENABLE;
-	jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
+	regmap_clear_bits(i2s->regmap, JZ_REG_AIC_CONF, JZ_AIC_CONF_ENABLE);
 
 	clk_disable_unprepare(i2s->clk_i2s);
 }
@@ -161,8 +141,6 @@ static int jz4740_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 	struct snd_soc_dai *dai)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
-
-	uint32_t ctrl;
 	uint32_t mask;
 
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
@@ -170,38 +148,30 @@ static int jz4740_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 	else
 		mask = JZ_AIC_CTRL_ENABLE_CAPTURE | JZ_AIC_CTRL_ENABLE_RX_DMA;
 
-	ctrl = jz4740_i2s_read(i2s, JZ_REG_AIC_CTRL);
-
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
-		ctrl |= mask;
+		regmap_set_bits(i2s->regmap, JZ_REG_AIC_CTRL, mask);
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
-		ctrl &= ~mask;
+		regmap_clear_bits(i2s->regmap, JZ_REG_AIC_CTRL, mask);
 		break;
 	default:
 		return -EINVAL;
 	}
 
-	jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl);
-
 	return 0;
 }
 
 static int jz4740_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
-
-	uint32_t format = 0;
-	uint32_t conf;
-
-	conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
-
-	conf &= ~(JZ_AIC_CONF_BIT_CLK_MASTER | JZ_AIC_CONF_SYNC_CLK_MASTER);
+	const unsigned int conf_mask = JZ_AIC_CONF_BIT_CLK_MASTER |
+				       JZ_AIC_CONF_SYNC_CLK_MASTER;
+	unsigned int conf = 0, format = 0;
 
 	switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
 	case SND_SOC_DAIFMT_BP_FP:
@@ -237,8 +207,8 @@ static int jz4740_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 		return -EINVAL;
 	}
 
-	jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
-	jz4740_i2s_write(i2s, JZ_REG_AIC_I2S_FMT, format);
+	regmap_update_bits(i2s->regmap, JZ_REG_AIC_CONF, conf_mask, conf);
+	regmap_write(i2s->regmap, JZ_REG_AIC_I2S_FMT, format);
 
 	return 0;
 }
@@ -251,9 +221,9 @@ static int jz4740_i2s_hw_params(struct snd_pcm_substream *substream,
 	uint32_t ctrl, div_reg;
 	int div;
 
-	ctrl = jz4740_i2s_read(i2s, JZ_REG_AIC_CTRL);
+	regmap_read(i2s->regmap, JZ_REG_AIC_CTRL, &ctrl);
+	regmap_read(i2s->regmap, JZ_REG_AIC_CLK_DIV, &div_reg);
 
-	div_reg = jz4740_i2s_read(i2s, JZ_REG_AIC_CLK_DIV);
 	div = clk_get_rate(i2s->clk_i2s) / (64 * params_rate(params));
 
 	switch (params_format(params)) {
@@ -290,8 +260,8 @@ static int jz4740_i2s_hw_params(struct snd_pcm_substream *substream,
 		}
 	}
 
-	jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl);
-	jz4740_i2s_write(i2s, JZ_REG_AIC_CLK_DIV, div_reg);
+	regmap_write(i2s->regmap, JZ_REG_AIC_CTRL, ctrl);
+	regmap_write(i2s->regmap, JZ_REG_AIC_CLK_DIV, div_reg);
 
 	return 0;
 }
@@ -328,13 +298,9 @@ static int jz4740_i2s_set_sysclk(struct snd_soc_dai *dai, int clk_id,
 static int jz4740_i2s_suspend(struct snd_soc_component *component)
 {
 	struct jz4740_i2s *i2s = snd_soc_component_get_drvdata(component);
-	uint32_t conf;
 
 	if (snd_soc_component_active(component)) {
-		conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
-		conf &= ~JZ_AIC_CONF_ENABLE;
-		jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
-
+		regmap_clear_bits(i2s->regmap, JZ_REG_AIC_CONF, JZ_AIC_CONF_ENABLE);
 		clk_disable_unprepare(i2s->clk_i2s);
 	}
 
@@ -346,7 +312,6 @@ static int jz4740_i2s_suspend(struct snd_soc_component *component)
 static int jz4740_i2s_resume(struct snd_soc_component *component)
 {
 	struct jz4740_i2s *i2s = snd_soc_component_get_drvdata(component);
-	uint32_t conf;
 	int ret;
 
 	ret = clk_prepare_enable(i2s->clk_aic);
@@ -360,9 +325,7 @@ static int jz4740_i2s_resume(struct snd_soc_component *component)
 			return ret;
 		}
 
-		conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
-		conf |= JZ_AIC_CONF_ENABLE;
-		jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
+		regmap_set_bits(i2s->regmap, JZ_REG_AIC_CONF, JZ_AIC_CONF_ENABLE);
 	}
 
 	return 0;
@@ -395,8 +358,8 @@ static int jz4740_i2s_dai_probe(struct snd_soc_dai *dai)
 			JZ_AIC_CONF_INTERNAL_CODEC;
 	}
 
-	jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, JZ_AIC_CONF_RESET);
-	jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
+	regmap_write(i2s->regmap, JZ_REG_AIC_CONF, JZ_AIC_CONF_RESET);
+	regmap_write(i2s->regmap, JZ_REG_AIC_CONF, conf);
 
 	return 0;
 }
@@ -494,11 +457,19 @@ static const struct of_device_id jz4740_of_matches[] = {
 };
 MODULE_DEVICE_TABLE(of, jz4740_of_matches);
 
+static const struct regmap_config jz4740_i2s_regmap_config = {
+	.reg_bits	= 32,
+	.reg_stride	= 4,
+	.val_bits	= 32,
+	.max_register	= JZ_REG_AIC_FIFO,
+};
+
 static int jz4740_i2s_dev_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct jz4740_i2s *i2s;
 	struct resource *mem;
+	void __iomem *regs;
 	int ret;
 
 	i2s = devm_kzalloc(dev, sizeof(*i2s), GFP_KERNEL);
@@ -507,9 +478,9 @@ static int jz4740_i2s_dev_probe(struct platform_device *pdev)
 
 	i2s->soc_info = device_get_match_data(dev);
 
-	i2s->base = devm_platform_get_and_ioremap_resource(pdev, 0, &mem);
-	if (IS_ERR(i2s->base))
-		return PTR_ERR(i2s->base);
+	regs = devm_platform_get_and_ioremap_resource(pdev, 0, &mem);
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
 
 	i2s->playback_dma_data.maxburst = 16;
 	i2s->playback_dma_data.addr = mem->start + JZ_REG_AIC_FIFO;
@@ -525,6 +496,11 @@ static int jz4740_i2s_dev_probe(struct platform_device *pdev)
 	if (IS_ERR(i2s->clk_i2s))
 		return PTR_ERR(i2s->clk_i2s);
 
+	i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
+					    &jz4740_i2s_regmap_config);
+	if (IS_ERR(i2s->regmap))
+		return PTR_ERR(i2s->regmap);
+
 	platform_set_drvdata(pdev, i2s);
 
 	ret = devm_snd_soc_register_component(dev, &jz4740_i2s_component,
-- 
2.35.1