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");
103