blob: a450e7af877c337aec3aff21f0676299b3699f73 [file] [log] [blame]
Ken Xue92082a82015-02-06 08:27:51 +08001/*
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>
Ken Xue92082a82015-02-06 08:27:51 +080019#include <linux/pm.h>
20
21#include "internal.h"
22
23ACPI_MODULE_NAME("acpi_apd");
24struct 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 */
42struct apd_device_desc {
43 unsigned int flags;
44 unsigned int fixed_clk_rate;
45 int (*setup)(struct apd_private_data *pdata);
46};
47
48struct 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
57static 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
74static struct apd_device_desc cz_i2c_desc = {
75 .setup = acpi_apd_setup,
76 .fixed_clk_rate = 133000000,
77};
78
79static 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*/
94static 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
133static 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
141static struct acpi_scan_handler apd_handler = {
142 .ids = acpi_apd_device_ids,
143 .attach = acpi_apd_create_device,
144};
145
146void __init acpi_apd_init(void)
147{
148 acpi_scan_add_handler(&apd_handler);
149}