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92082a88 KX |
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/clk.h> | |
20 | #include <linux/pm.h> | |
21 | ||
22 | #include "internal.h" | |
23 | ||
24 | ACPI_MODULE_NAME("acpi_apd"); | |
25 | struct apd_private_data; | |
26 | ||
27 | /** | |
28 | * ACPI_APD_SYSFS : add device attributes in sysfs | |
29 | * ACPI_APD_PM : attach power domain to device | |
30 | */ | |
31 | #define ACPI_APD_SYSFS BIT(0) | |
32 | #define ACPI_APD_PM BIT(1) | |
33 | ||
34 | /** | |
35 | * struct apd_device_desc - a descriptor for apd device | |
36 | * @flags: device flags like %ACPI_APD_SYSFS, %ACPI_APD_PM | |
37 | * @fixed_clk_rate: fixed rate input clock source for acpi device; | |
38 | * 0 means no fixed rate input clock source | |
39 | * @setup: a hook routine to set device resource during create platform device | |
40 | * | |
41 | * Device description defined as acpi_device_id.driver_data | |
42 | */ | |
43 | struct apd_device_desc { | |
44 | unsigned int flags; | |
45 | unsigned int fixed_clk_rate; | |
46 | int (*setup)(struct apd_private_data *pdata); | |
47 | }; | |
48 | ||
49 | struct apd_private_data { | |
50 | struct clk *clk; | |
51 | struct acpi_device *adev; | |
52 | const struct apd_device_desc *dev_desc; | |
53 | }; | |
54 | ||
55 | #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE | |
56 | #define APD_ADDR(desc) ((unsigned long)&desc) | |
57 | ||
58 | static int acpi_apd_setup(struct apd_private_data *pdata) | |
59 | { | |
60 | const struct apd_device_desc *dev_desc = pdata->dev_desc; | |
61 | struct clk *clk = ERR_PTR(-ENODEV); | |
62 | ||
63 | if (dev_desc->fixed_clk_rate) { | |
64 | clk = clk_register_fixed_rate(&pdata->adev->dev, | |
65 | dev_name(&pdata->adev->dev), | |
66 | NULL, CLK_IS_ROOT, | |
67 | dev_desc->fixed_clk_rate); | |
68 | clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev)); | |
69 | pdata->clk = clk; | |
70 | } | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
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 | ||
85 | #else | |
86 | ||
87 | #define APD_ADDR(desc) (0UL) | |
88 | ||
89 | #endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */ | |
90 | ||
91 | /** | |
92 | * Create platform device during acpi scan attach handle. | |
93 | * Return value > 0 on success of creating device. | |
94 | */ | |
95 | static int acpi_apd_create_device(struct acpi_device *adev, | |
96 | const struct acpi_device_id *id) | |
97 | { | |
98 | const struct apd_device_desc *dev_desc = (void *)id->driver_data; | |
99 | struct apd_private_data *pdata; | |
100 | struct platform_device *pdev; | |
101 | int ret; | |
102 | ||
103 | if (!dev_desc) { | |
104 | pdev = acpi_create_platform_device(adev); | |
105 | return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1; | |
106 | } | |
107 | ||
108 | pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); | |
109 | if (!pdata) | |
110 | return -ENOMEM; | |
111 | ||
112 | pdata->adev = adev; | |
113 | pdata->dev_desc = dev_desc; | |
114 | ||
115 | if (dev_desc->setup) { | |
116 | ret = dev_desc->setup(pdata); | |
117 | if (ret) | |
118 | goto err_out; | |
119 | } | |
120 | ||
121 | adev->driver_data = pdata; | |
122 | pdev = acpi_create_platform_device(adev); | |
123 | if (!IS_ERR_OR_NULL(pdev)) | |
124 | return 1; | |
125 | ||
126 | ret = PTR_ERR(pdev); | |
127 | adev->driver_data = NULL; | |
128 | ||
129 | err_out: | |
130 | kfree(pdata); | |
131 | return ret; | |
132 | } | |
133 | ||
134 | static const struct acpi_device_id acpi_apd_device_ids[] = { | |
135 | /* Generic apd devices */ | |
136 | { "AMD0010", APD_ADDR(cz_i2c_desc) }, | |
137 | { "AMD0020", APD_ADDR(cz_uart_desc) }, | |
138 | { "AMD0030", }, | |
139 | { } | |
140 | }; | |
141 | ||
142 | static struct acpi_scan_handler apd_handler = { | |
143 | .ids = acpi_apd_device_ids, | |
144 | .attach = acpi_apd_create_device, | |
145 | }; | |
146 | ||
147 | void __init acpi_apd_init(void) | |
148 | { | |
149 | acpi_scan_add_handler(&apd_handler); | |
150 | } |