forked from Minki/linux
55b407f646
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>
103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
// 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");
|