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c695abab SN |
1 | /* |
2 | * Copyright (C) 2015 - 2016 Samsung Electronics Co., Ltd. | |
3 | * | |
4 | * Authors: Inha Song <ideal.song@samsung.com> | |
5 | * Sylwester Nawrocki <s.nawrocki@samsung.com> | |
6 | * | |
7 | * Samsung Exynos SoC series Low Power Audio Subsystem driver. | |
8 | * | |
9 | * This module provides regmap for the Top SFR region and instantiates | |
10 | * devices for IP blocks like DMAC, I2S, UART. | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 and | |
14 | * only version 2 as published by the Free Software Foundation. | |
15 | */ | |
16 | ||
8f1be5bd | 17 | #include <linux/clk.h> |
c695abab SN |
18 | #include <linux/delay.h> |
19 | #include <linux/io.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/mfd/syscon.h> | |
c695abab SN |
22 | #include <linux/of.h> |
23 | #include <linux/of_platform.h> | |
24 | #include <linux/platform_device.h> | |
90f44717 | 25 | #include <linux/pm_runtime.h> |
c695abab | 26 | #include <linux/regmap.h> |
f7f6c060 | 27 | #include <linux/soc/samsung/exynos-regs-pmu.h> |
c695abab SN |
28 | #include <linux/types.h> |
29 | ||
30 | /* LPASS Top register definitions */ | |
31 | #define SFR_LPASS_CORE_SW_RESET 0x08 | |
32 | #define LPASS_SB_SW_RESET BIT(11) | |
33 | #define LPASS_UART_SW_RESET BIT(10) | |
34 | #define LPASS_PCM_SW_RESET BIT(9) | |
35 | #define LPASS_I2S_SW_RESET BIT(8) | |
36 | #define LPASS_WDT1_SW_RESET BIT(4) | |
37 | #define LPASS_WDT0_SW_RESET BIT(3) | |
38 | #define LPASS_TIMER_SW_RESET BIT(2) | |
39 | #define LPASS_MEM_SW_RESET BIT(1) | |
40 | #define LPASS_DMA_SW_RESET BIT(0) | |
41 | ||
42 | #define SFR_LPASS_INTR_CA5_MASK 0x48 | |
43 | #define SFR_LPASS_INTR_CPU_MASK 0x58 | |
44 | #define LPASS_INTR_APM BIT(9) | |
45 | #define LPASS_INTR_MIF BIT(8) | |
46 | #define LPASS_INTR_TIMER BIT(7) | |
47 | #define LPASS_INTR_DMA BIT(6) | |
48 | #define LPASS_INTR_GPIO BIT(5) | |
49 | #define LPASS_INTR_I2S BIT(4) | |
50 | #define LPASS_INTR_PCM BIT(3) | |
51 | #define LPASS_INTR_SLIMBUS BIT(2) | |
52 | #define LPASS_INTR_UART BIT(1) | |
53 | #define LPASS_INTR_SFR BIT(0) | |
54 | ||
55 | struct exynos_lpass { | |
c695abab SN |
56 | /* pointer to the LPASS TOP regmap */ |
57 | struct regmap *top; | |
8f1be5bd | 58 | struct clk *sfr0_clk; |
c695abab SN |
59 | }; |
60 | ||
61 | static void exynos_lpass_core_sw_reset(struct exynos_lpass *lpass, int mask) | |
62 | { | |
63 | unsigned int val = 0; | |
64 | ||
65 | regmap_read(lpass->top, SFR_LPASS_CORE_SW_RESET, &val); | |
66 | ||
67 | val &= ~mask; | |
68 | regmap_write(lpass->top, SFR_LPASS_CORE_SW_RESET, val); | |
69 | ||
70 | usleep_range(100, 150); | |
71 | ||
72 | val |= mask; | |
73 | regmap_write(lpass->top, SFR_LPASS_CORE_SW_RESET, val); | |
74 | } | |
75 | ||
76 | static void exynos_lpass_enable(struct exynos_lpass *lpass) | |
77 | { | |
8f1be5bd MS |
78 | clk_prepare_enable(lpass->sfr0_clk); |
79 | ||
c695abab SN |
80 | /* Unmask SFR, DMA and I2S interrupt */ |
81 | regmap_write(lpass->top, SFR_LPASS_INTR_CA5_MASK, | |
82 | LPASS_INTR_SFR | LPASS_INTR_DMA | LPASS_INTR_I2S); | |
83 | ||
84 | regmap_write(lpass->top, SFR_LPASS_INTR_CPU_MASK, | |
85 | LPASS_INTR_SFR | LPASS_INTR_DMA | LPASS_INTR_I2S); | |
86 | ||
c695abab SN |
87 | exynos_lpass_core_sw_reset(lpass, LPASS_I2S_SW_RESET); |
88 | exynos_lpass_core_sw_reset(lpass, LPASS_DMA_SW_RESET); | |
89 | exynos_lpass_core_sw_reset(lpass, LPASS_MEM_SW_RESET); | |
90 | } | |
91 | ||
92 | static void exynos_lpass_disable(struct exynos_lpass *lpass) | |
93 | { | |
94 | /* Mask any unmasked IP interrupt sources */ | |
95 | regmap_write(lpass->top, SFR_LPASS_INTR_CPU_MASK, 0); | |
96 | regmap_write(lpass->top, SFR_LPASS_INTR_CA5_MASK, 0); | |
8f1be5bd MS |
97 | |
98 | clk_disable_unprepare(lpass->sfr0_clk); | |
c695abab SN |
99 | } |
100 | ||
101 | static const struct regmap_config exynos_lpass_reg_conf = { | |
102 | .reg_bits = 32, | |
103 | .reg_stride = 4, | |
104 | .val_bits = 32, | |
105 | .max_register = 0xfc, | |
106 | .fast_io = true, | |
107 | }; | |
108 | ||
109 | static int exynos_lpass_probe(struct platform_device *pdev) | |
110 | { | |
111 | struct device *dev = &pdev->dev; | |
112 | struct exynos_lpass *lpass; | |
113 | void __iomem *base_top; | |
114 | struct resource *res; | |
115 | ||
116 | lpass = devm_kzalloc(dev, sizeof(*lpass), GFP_KERNEL); | |
117 | if (!lpass) | |
118 | return -ENOMEM; | |
119 | ||
120 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
121 | base_top = devm_ioremap_resource(dev, res); | |
122 | if (IS_ERR(base_top)) | |
123 | return PTR_ERR(base_top); | |
124 | ||
8f1be5bd MS |
125 | lpass->sfr0_clk = devm_clk_get(dev, "sfr0_ctrl"); |
126 | if (IS_ERR(lpass->sfr0_clk)) | |
127 | return PTR_ERR(lpass->sfr0_clk); | |
128 | ||
c695abab SN |
129 | lpass->top = regmap_init_mmio(dev, base_top, |
130 | &exynos_lpass_reg_conf); | |
131 | if (IS_ERR(lpass->top)) { | |
132 | dev_err(dev, "LPASS top regmap initialization failed\n"); | |
133 | return PTR_ERR(lpass->top); | |
134 | } | |
135 | ||
c695abab | 136 | platform_set_drvdata(pdev, lpass); |
90f44717 MS |
137 | pm_runtime_set_active(dev); |
138 | pm_runtime_enable(dev); | |
c695abab SN |
139 | exynos_lpass_enable(lpass); |
140 | ||
141 | return of_platform_populate(dev->of_node, NULL, NULL, dev); | |
142 | } | |
143 | ||
c414df12 MS |
144 | static int exynos_lpass_remove(struct platform_device *pdev) |
145 | { | |
146 | struct exynos_lpass *lpass = platform_get_drvdata(pdev); | |
147 | ||
148 | exynos_lpass_disable(lpass); | |
90f44717 MS |
149 | pm_runtime_disable(&pdev->dev); |
150 | if (!pm_runtime_status_suspended(&pdev->dev)) | |
151 | exynos_lpass_disable(lpass); | |
c414df12 MS |
152 | regmap_exit(lpass->top); |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
22a96b85 | 157 | static int __maybe_unused exynos_lpass_suspend(struct device *dev) |
c695abab SN |
158 | { |
159 | struct exynos_lpass *lpass = dev_get_drvdata(dev); | |
160 | ||
161 | exynos_lpass_disable(lpass); | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
22a96b85 | 166 | static int __maybe_unused exynos_lpass_resume(struct device *dev) |
c695abab SN |
167 | { |
168 | struct exynos_lpass *lpass = dev_get_drvdata(dev); | |
169 | ||
170 | exynos_lpass_enable(lpass); | |
171 | ||
172 | return 0; | |
173 | } | |
c695abab | 174 | |
90f44717 MS |
175 | static const struct dev_pm_ops lpass_pm_ops = { |
176 | SET_RUNTIME_PM_OPS(exynos_lpass_suspend, exynos_lpass_resume, NULL) | |
177 | SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, | |
178 | pm_runtime_force_resume) | |
179 | }; | |
c695abab SN |
180 | |
181 | static const struct of_device_id exynos_lpass_of_match[] = { | |
182 | { .compatible = "samsung,exynos5433-lpass" }, | |
183 | { }, | |
184 | }; | |
185 | MODULE_DEVICE_TABLE(of, exynos_lpass_of_match); | |
186 | ||
187 | static struct platform_driver exynos_lpass_driver = { | |
188 | .driver = { | |
189 | .name = "exynos-lpass", | |
190 | .pm = &lpass_pm_ops, | |
191 | .of_match_table = exynos_lpass_of_match, | |
192 | }, | |
193 | .probe = exynos_lpass_probe, | |
c414df12 | 194 | .remove = exynos_lpass_remove, |
c695abab SN |
195 | }; |
196 | module_platform_driver(exynos_lpass_driver); | |
197 | ||
198 | MODULE_DESCRIPTION("Samsung Low Power Audio Subsystem driver"); | |
199 | MODULE_LICENSE("GPL v2"); |