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1// SPDX-License-Identifier: GPL-2.0+2/*3 * This driver provides regmap to access to analog part of audio codec4 * found on Allwinner A23, A31s, A33, H3 and A64 Socs5 *6 * Copyright 2016 Chen-Yu Tsai <wens@csie.org>7 * Copyright (C) 2018 Vasily Khoruzhick <anarsoul@gmail.com>8 */9 10#include <linux/io.h>11#include <linux/kernel.h>12#include <linux/module.h>13#include <linux/regmap.h>14 15#include "sun8i-adda-pr-regmap.h"16 17/* Analog control register access bits */18#define ADDA_PR 0x0 /* PRCM base + 0x1c0 */19#define ADDA_PR_RESET BIT(28)20#define ADDA_PR_WRITE BIT(24)21#define ADDA_PR_ADDR_SHIFT 1622#define ADDA_PR_ADDR_MASK GENMASK(4, 0)23#define ADDA_PR_DATA_IN_SHIFT 824#define ADDA_PR_DATA_IN_MASK GENMASK(7, 0)25#define ADDA_PR_DATA_OUT_SHIFT 026#define ADDA_PR_DATA_OUT_MASK GENMASK(7, 0)27 28/* regmap access bits */29static int adda_reg_read(void *context, unsigned int reg, unsigned int *val)30{31 void __iomem *base = (void __iomem *)context;32 u32 tmp;33 34 /* De-assert reset */35 writel(readl(base) | ADDA_PR_RESET, base);36 37 /* Clear write bit */38 writel(readl(base) & ~ADDA_PR_WRITE, base);39 40 /* Set register address */41 tmp = readl(base);42 tmp &= ~(ADDA_PR_ADDR_MASK << ADDA_PR_ADDR_SHIFT);43 tmp |= (reg & ADDA_PR_ADDR_MASK) << ADDA_PR_ADDR_SHIFT;44 writel(tmp, base);45 46 /* Read back value */47 *val = readl(base) & ADDA_PR_DATA_OUT_MASK;48 49 return 0;50}51 52static int adda_reg_write(void *context, unsigned int reg, unsigned int val)53{54 void __iomem *base = (void __iomem *)context;55 u32 tmp;56 57 /* De-assert reset */58 writel(readl(base) | ADDA_PR_RESET, base);59 60 /* Set register address */61 tmp = readl(base);62 tmp &= ~(ADDA_PR_ADDR_MASK << ADDA_PR_ADDR_SHIFT);63 tmp |= (reg & ADDA_PR_ADDR_MASK) << ADDA_PR_ADDR_SHIFT;64 writel(tmp, base);65 66 /* Set data to write */67 tmp = readl(base);68 tmp &= ~(ADDA_PR_DATA_IN_MASK << ADDA_PR_DATA_IN_SHIFT);69 tmp |= (val & ADDA_PR_DATA_IN_MASK) << ADDA_PR_DATA_IN_SHIFT;70 writel(tmp, base);71 72 /* Set write bit to signal a write */73 writel(readl(base) | ADDA_PR_WRITE, base);74 75 /* Clear write bit */76 writel(readl(base) & ~ADDA_PR_WRITE, base);77 78 return 0;79}80 81static const struct regmap_config adda_pr_regmap_cfg = {82 .name = "adda-pr",83 .reg_bits = 5,84 .reg_stride = 1,85 .val_bits = 8,86 .reg_read = adda_reg_read,87 .reg_write = adda_reg_write,88 .fast_io = true,89 .max_register = 31,90};91 92struct regmap *sun8i_adda_pr_regmap_init(struct device *dev,93 void __iomem *base)94{95 return devm_regmap_init(dev, NULL, base, &adda_pr_regmap_cfg);96}97EXPORT_SYMBOL_GPL(sun8i_adda_pr_regmap_init);98 99MODULE_DESCRIPTION("Allwinner analog audio codec regmap driver");100MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");101MODULE_LICENSE("GPL");102MODULE_ALIAS("platform:sunxi-adda-pr");103