drm/exynos: Use VIDEO_SAMSUNG_S5P_G2D=n as G2D Kconfig dependency
[deliverable/linux.git] / drivers / acpi / acpi_apd.c
1 /*
2 * AMD ACPI support for ACPI2platform device.
3 *
4 * Copyright (c) 2014,2015 AMD Corporation.
5 * Authors: Ken Xue <Ken.Xue@amd.com>
6 * Wu, Jeff <Jeff.Wu@amd.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/clk-provider.h>
14 #include <linux/platform_device.h>
15 #include <linux/pm_domain.h>
16 #include <linux/clkdev.h>
17 #include <linux/acpi.h>
18 #include <linux/err.h>
19 #include <linux/pm.h>
20
21 #include "internal.h"
22
23 ACPI_MODULE_NAME("acpi_apd");
24 struct apd_private_data;
25
26 /**
27 * ACPI_APD_SYSFS : add device attributes in sysfs
28 * ACPI_APD_PM : attach power domain to device
29 */
30 #define ACPI_APD_SYSFS BIT(0)
31 #define ACPI_APD_PM BIT(1)
32
33 /**
34 * struct apd_device_desc - a descriptor for apd device
35 * @flags: device flags like %ACPI_APD_SYSFS, %ACPI_APD_PM
36 * @fixed_clk_rate: fixed rate input clock source for acpi device;
37 * 0 means no fixed rate input clock source
38 * @setup: a hook routine to set device resource during create platform device
39 *
40 * Device description defined as acpi_device_id.driver_data
41 */
42 struct apd_device_desc {
43 unsigned int flags;
44 unsigned int fixed_clk_rate;
45 int (*setup)(struct apd_private_data *pdata);
46 };
47
48 struct apd_private_data {
49 struct clk *clk;
50 struct acpi_device *adev;
51 const struct apd_device_desc *dev_desc;
52 };
53
54 #if defined(CONFIG_X86_AMD_PLATFORM_DEVICE) || defined(CONFIG_ARM64)
55 #define APD_ADDR(desc) ((unsigned long)&desc)
56
57 static int acpi_apd_setup(struct apd_private_data *pdata)
58 {
59 const struct apd_device_desc *dev_desc = pdata->dev_desc;
60 struct clk *clk = ERR_PTR(-ENODEV);
61
62 if (dev_desc->fixed_clk_rate) {
63 clk = clk_register_fixed_rate(&pdata->adev->dev,
64 dev_name(&pdata->adev->dev),
65 NULL, CLK_IS_ROOT,
66 dev_desc->fixed_clk_rate);
67 clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev));
68 pdata->clk = clk;
69 }
70
71 return 0;
72 }
73
74 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
75 static struct apd_device_desc cz_i2c_desc = {
76 .setup = acpi_apd_setup,
77 .fixed_clk_rate = 133000000,
78 };
79
80 static struct apd_device_desc cz_uart_desc = {
81 .setup = acpi_apd_setup,
82 .fixed_clk_rate = 48000000,
83 };
84 #endif
85
86 #ifdef CONFIG_ARM64
87 static struct apd_device_desc xgene_i2c_desc = {
88 .setup = acpi_apd_setup,
89 .fixed_clk_rate = 100000000,
90 };
91 #endif
92
93 #else
94
95 #define APD_ADDR(desc) (0UL)
96
97 #endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
98
99 /**
100 * Create platform device during acpi scan attach handle.
101 * Return value > 0 on success of creating device.
102 */
103 static int acpi_apd_create_device(struct acpi_device *adev,
104 const struct acpi_device_id *id)
105 {
106 const struct apd_device_desc *dev_desc = (void *)id->driver_data;
107 struct apd_private_data *pdata;
108 struct platform_device *pdev;
109 int ret;
110
111 if (!dev_desc) {
112 pdev = acpi_create_platform_device(adev);
113 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
114 }
115
116 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
117 if (!pdata)
118 return -ENOMEM;
119
120 pdata->adev = adev;
121 pdata->dev_desc = dev_desc;
122
123 if (dev_desc->setup) {
124 ret = dev_desc->setup(pdata);
125 if (ret)
126 goto err_out;
127 }
128
129 adev->driver_data = pdata;
130 pdev = acpi_create_platform_device(adev);
131 if (!IS_ERR_OR_NULL(pdev))
132 return 1;
133
134 ret = PTR_ERR(pdev);
135 adev->driver_data = NULL;
136
137 err_out:
138 kfree(pdata);
139 return ret;
140 }
141
142 static const struct acpi_device_id acpi_apd_device_ids[] = {
143 /* Generic apd devices */
144 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
145 { "AMD0010", APD_ADDR(cz_i2c_desc) },
146 { "AMDI0010", APD_ADDR(cz_i2c_desc) },
147 { "AMD0020", APD_ADDR(cz_uart_desc) },
148 { "AMDI0020", APD_ADDR(cz_uart_desc) },
149 { "AMD0030", },
150 #endif
151 #ifdef CONFIG_ARM64
152 { "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
153 #endif
154 { }
155 };
156
157 static struct acpi_scan_handler apd_handler = {
158 .ids = acpi_apd_device_ids,
159 .attach = acpi_apd_create_device,
160 };
161
162 void __init acpi_apd_init(void)
163 {
164 acpi_scan_add_handler(&apd_handler);
165 }
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