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55b407f6 VK |
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 */ | |
29 | static 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 | ||
52 | static 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 | ||
81 | static 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 | ||
92 | struct 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 | } | |
97 | EXPORT_SYMBOL_GPL(sun8i_adda_pr_regmap_init); | |
98 | ||
99 | MODULE_DESCRIPTION("Allwinner analog audio codec regmap driver"); | |
100 | MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>"); | |
101 | MODULE_LICENSE("GPL"); | |
102 | MODULE_ALIAS("platform:sunxi-adda-pr"); |