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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
Loc Hob790eb22015-12-10 14:19:16 -070054#if defined(CONFIG_X86_AMD_PLATFORM_DEVICE) || defined(CONFIG_ARM64)
Ken Xue92082a82015-02-06 08:27:51 +080055#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),
Stephen Boydcdd9a6b2016-04-19 18:27:46 -070065 NULL, 0, dev_desc->fixed_clk_rate);
Ken Xue92082a82015-02-06 08:27:51 +080066 clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev));
67 pdata->clk = clk;
68 }
69
70 return 0;
71}
72
Loc Hob790eb22015-12-10 14:19:16 -070073#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
Ken Xue92082a82015-02-06 08:27:51 +080074static 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};
Loc Hob790eb22015-12-10 14:19:16 -070083#endif
84
85#ifdef CONFIG_ARM64
86static struct apd_device_desc xgene_i2c_desc = {
87 .setup = acpi_apd_setup,
88 .fixed_clk_rate = 100000000,
89};
90#endif
Ken Xue92082a82015-02-06 08:27:51 +080091
92#else
93
94#define APD_ADDR(desc) (0UL)
95
96#endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
97
98/**
99* Create platform device during acpi scan attach handle.
100* Return value > 0 on success of creating device.
101*/
102static int acpi_apd_create_device(struct acpi_device *adev,
103 const struct acpi_device_id *id)
104{
105 const struct apd_device_desc *dev_desc = (void *)id->driver_data;
106 struct apd_private_data *pdata;
107 struct platform_device *pdev;
108 int ret;
109
110 if (!dev_desc) {
111 pdev = acpi_create_platform_device(adev);
112 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
113 }
114
115 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
116 if (!pdata)
117 return -ENOMEM;
118
119 pdata->adev = adev;
120 pdata->dev_desc = dev_desc;
121
122 if (dev_desc->setup) {
123 ret = dev_desc->setup(pdata);
124 if (ret)
125 goto err_out;
126 }
127
128 adev->driver_data = pdata;
129 pdev = acpi_create_platform_device(adev);
130 if (!IS_ERR_OR_NULL(pdev))
131 return 1;
132
133 ret = PTR_ERR(pdev);
134 adev->driver_data = NULL;
135
136 err_out:
137 kfree(pdata);
138 return ret;
139}
140
141static const struct acpi_device_id acpi_apd_device_ids[] = {
142 /* Generic apd devices */
Loc Hob790eb22015-12-10 14:19:16 -0700143#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
Ken Xue92082a82015-02-06 08:27:51 +0800144 { "AMD0010", APD_ADDR(cz_i2c_desc) },
Xiangliang Yue4e666b2016-03-10 19:34:52 +0800145 { "AMDI0010", APD_ADDR(cz_i2c_desc) },
Ken Xue92082a82015-02-06 08:27:51 +0800146 { "AMD0020", APD_ADDR(cz_uart_desc) },
Wang Hongchengf5eda992016-03-11 17:28:23 +0800147 { "AMDI0020", APD_ADDR(cz_uart_desc) },
Ken Xue92082a82015-02-06 08:27:51 +0800148 { "AMD0030", },
Loc Hob790eb22015-12-10 14:19:16 -0700149#endif
150#ifdef CONFIG_ARM64
151 { "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
152#endif
Ken Xue92082a82015-02-06 08:27:51 +0800153 { }
154};
155
156static struct acpi_scan_handler apd_handler = {
157 .ids = acpi_apd_device_ids,
158 .attach = acpi_apd_create_device,
159};
160
161void __init acpi_apd_init(void)
162{
163 acpi_scan_add_handler(&apd_handler);
164}