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102 lines
2.6 KiB
102 lines
2.6 KiB
// 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 <[email protected]> |
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* Copyright (C) 2018 Vasily Khoruzhick <[email protected]> |
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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 <[email protected]>"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:sunxi-adda-pr");
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