ASoC: sun8i-codec-analog: split regmap code into separate driver

It will be reused by sun50i-codec-analog later.

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 102 insertions, 0 deletions

diff --git a/sound/soc/sunxi/sun8i-adda-pr-regmap.c b/sound/soc/sunxi/sun8i-adda-pr-regmap.c
new file mode 100644
index 000000000000..e68ce9d2884d
--- /dev/null
+++ b/sound/soc/sunxi/sun8i-adda-pr-regmap.c
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * This driver provides regmap to access to analog part of audio codec
+ * found on Allwinner A23, A31s, A33, H3 and A64 Socs
+ *
+ * Copyright 2016 Chen-Yu Tsai <wens@csie.org>
+ * Copyright (C) 2018 Vasily Khoruzhick <anarsoul@gmail.com>
+ */
+
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#include "sun8i-adda-pr-regmap.h"
+
+/* Analog control register access bits */
+#define ADDA_PR			0x0		/* PRCM base + 0x1c0 */
+#define ADDA_PR_RESET			BIT(28)
+#define ADDA_PR_WRITE			BIT(24)
+#define ADDA_PR_ADDR_SHIFT		16
+#define ADDA_PR_ADDR_MASK		GENMASK(4, 0)
+#define ADDA_PR_DATA_IN_SHIFT		8
+#define ADDA_PR_DATA_IN_MASK		GENMASK(7, 0)
+#define ADDA_PR_DATA_OUT_SHIFT		0
+#define ADDA_PR_DATA_OUT_MASK		GENMASK(7, 0)
+
+/* regmap access bits */
+static int adda_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+	void __iomem *base = (void __iomem *)context;
+	u32 tmp;
+
+	/* De-assert reset */
+	writel(readl(base) | ADDA_PR_RESET, base);
+
+	/* Clear write bit */
+	writel(readl(base) & ~ADDA_PR_WRITE, base);
+
+	/* Set register address */
+	tmp = readl(base);
+	tmp &= ~(ADDA_PR_ADDR_MASK << ADDA_PR_ADDR_SHIFT);
+	tmp |= (reg & ADDA_PR_ADDR_MASK) << ADDA_PR_ADDR_SHIFT;
+	writel(tmp, base);
+
+	/* Read back value */
+	*val = readl(base) & ADDA_PR_DATA_OUT_MASK;
+
+	return 0;
+}
+
+static int adda_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+	void __iomem *base = (void __iomem *)context;
+	u32 tmp;
+
+	/* De-assert reset */
+	writel(readl(base) | ADDA_PR_RESET, base);
+
+	/* Set register address */
+	tmp = readl(base);
+	tmp &= ~(ADDA_PR_ADDR_MASK << ADDA_PR_ADDR_SHIFT);
+	tmp |= (reg & ADDA_PR_ADDR_MASK) << ADDA_PR_ADDR_SHIFT;
+	writel(tmp, base);
+
+	/* Set data to write */
+	tmp = readl(base);
+	tmp &= ~(ADDA_PR_DATA_IN_MASK << ADDA_PR_DATA_IN_SHIFT);
+	tmp |= (val & ADDA_PR_DATA_IN_MASK) << ADDA_PR_DATA_IN_SHIFT;
+	writel(tmp, base);
+
+	/* Set write bit to signal a write */
+	writel(readl(base) | ADDA_PR_WRITE, base);
+
+	/* Clear write bit */
+	writel(readl(base) & ~ADDA_PR_WRITE, base);
+
+	return 0;
+}
+
+static const struct regmap_config adda_pr_regmap_cfg = {
+	.name		= "adda-pr",
+	.reg_bits	= 5,
+	.reg_stride	= 1,
+	.val_bits	= 8,
+	.reg_read	= adda_reg_read,
+	.reg_write	= adda_reg_write,
+	.fast_io	= true,
+	.max_register	= 31,
+};
+
+struct regmap *sun8i_adda_pr_regmap_init(struct device *dev,
+					 void __iomem *base)
+{
+	return devm_regmap_init(dev, NULL, base, &adda_pr_regmap_cfg);
+}
+EXPORT_SYMBOL_GPL(sun8i_adda_pr_regmap_init);
+
+MODULE_DESCRIPTION("Allwinner analog audio codec regmap driver");
+MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:sunxi-adda-pr");