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// 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");
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