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