// 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");