1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * This driver provides regmap to access to analog part of audio codec
  4 * found on Allwinner A23, A31s, A33, H3 and A64 Socs
  5 *
  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		16
 22#define ADDA_PR_ADDR_MASK		GENMASK(4, 0)
 23#define ADDA_PR_DATA_IN_SHIFT		8
 24#define ADDA_PR_DATA_IN_MASK		GENMASK(7, 0)
 25#define ADDA_PR_DATA_OUT_SHIFT		0
 26#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");