GNU Linux-libre 4.4.289-gnu1
[releases.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 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
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 static struct apd_device_desc cz_i2c_desc = {
75         .setup = acpi_apd_setup,
76         .fixed_clk_rate = 133000000,
77 };
78
79 static struct apd_device_desc cz_uart_desc = {
80         .setup = acpi_apd_setup,
81         .fixed_clk_rate = 48000000,
82 };
83
84 #else
85
86 #define APD_ADDR(desc) (0UL)
87
88 #endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
89
90 /**
91 * Create platform device during acpi scan attach handle.
92 * Return value > 0 on success of creating device.
93 */
94 static int acpi_apd_create_device(struct acpi_device *adev,
95                                    const struct acpi_device_id *id)
96 {
97         const struct apd_device_desc *dev_desc = (void *)id->driver_data;
98         struct apd_private_data *pdata;
99         struct platform_device *pdev;
100         int ret;
101
102         if (!dev_desc) {
103                 pdev = acpi_create_platform_device(adev);
104                 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
105         }
106
107         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
108         if (!pdata)
109                 return -ENOMEM;
110
111         pdata->adev = adev;
112         pdata->dev_desc = dev_desc;
113
114         if (dev_desc->setup) {
115                 ret = dev_desc->setup(pdata);
116                 if (ret)
117                         goto err_out;
118         }
119
120         adev->driver_data = pdata;
121         pdev = acpi_create_platform_device(adev);
122         if (!IS_ERR_OR_NULL(pdev))
123                 return 1;
124
125         ret = PTR_ERR(pdev);
126         adev->driver_data = NULL;
127
128  err_out:
129         kfree(pdata);
130         return ret;
131 }
132
133 static const struct acpi_device_id acpi_apd_device_ids[] = {
134         /* Generic apd devices */
135         { "AMD0010", APD_ADDR(cz_i2c_desc) },
136         { "AMD0020", APD_ADDR(cz_uart_desc) },
137         { "AMD0030", },
138         { }
139 };
140
141 static struct acpi_scan_handler apd_handler = {
142         .ids = acpi_apd_device_ids,
143         .attach = acpi_apd_create_device,
144 };
145
146 void __init acpi_apd_init(void)
147 {
148         acpi_scan_add_handler(&apd_handler);
149 }