tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
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 struct property_entry *properties;
46 int (*setup)(struct apd_private_data *pdata);
47};
48
49struct apd_private_data {
50 struct clk *clk;
51 struct acpi_device *adev;
52 const struct apd_device_desc *dev_desc;
53};
54
55#if defined(CONFIG_X86_AMD_PLATFORM_DEVICE) || defined(CONFIG_ARM64)
56#define APD_ADDR(desc) ((unsigned long)&desc)
57
58static 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, 0, 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
75static const struct apd_device_desc cz_i2c_desc = {
76 .setup = acpi_apd_setup,
77 .fixed_clk_rate = 133000000,
78};
79
80static const struct apd_device_desc wt_i2c_desc = {
81 .setup = acpi_apd_setup,
82 .fixed_clk_rate = 150000000,
83};
84
85static struct property_entry uart_properties[] = {
86 PROPERTY_ENTRY_U32("reg-io-width", 4),
87 PROPERTY_ENTRY_U32("reg-shift", 2),
88 PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
89 { },
90};
91
92static const struct apd_device_desc cz_uart_desc = {
93 .setup = acpi_apd_setup,
94 .fixed_clk_rate = 48000000,
95 .properties = uart_properties,
96};
97#endif
98
99#ifdef CONFIG_ARM64
100static const struct apd_device_desc xgene_i2c_desc = {
101 .setup = acpi_apd_setup,
102 .fixed_clk_rate = 100000000,
103};
104
105static const struct apd_device_desc vulcan_spi_desc = {
106 .setup = acpi_apd_setup,
107 .fixed_clk_rate = 133000000,
108};
109
110static const struct apd_device_desc hip07_i2c_desc = {
111 .setup = acpi_apd_setup,
112 .fixed_clk_rate = 200000000,
113};
114
115static const struct apd_device_desc hip08_i2c_desc = {
116 .setup = acpi_apd_setup,
117 .fixed_clk_rate = 250000000,
118};
119#endif
120
121#else
122
123#define APD_ADDR(desc) (0UL)
124
125#endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
126
127/**
128* Create platform device during acpi scan attach handle.
129* Return value > 0 on success of creating device.
130*/
131static int acpi_apd_create_device(struct acpi_device *adev,
132 const struct acpi_device_id *id)
133{
134 const struct apd_device_desc *dev_desc = (void *)id->driver_data;
135 struct apd_private_data *pdata;
136 struct platform_device *pdev;
137 int ret;
138
139 if (!dev_desc) {
140 pdev = acpi_create_platform_device(adev, NULL);
141 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
142 }
143
144 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
145 if (!pdata)
146 return -ENOMEM;
147
148 pdata->adev = adev;
149 pdata->dev_desc = dev_desc;
150
151 if (dev_desc->setup) {
152 ret = dev_desc->setup(pdata);
153 if (ret)
154 goto err_out;
155 }
156
157 adev->driver_data = pdata;
158 pdev = acpi_create_platform_device(adev, dev_desc->properties);
159 if (!IS_ERR_OR_NULL(pdev))
160 return 1;
161
162 ret = PTR_ERR(pdev);
163 adev->driver_data = NULL;
164
165 err_out:
166 kfree(pdata);
167 return ret;
168}
169
170static const struct acpi_device_id acpi_apd_device_ids[] = {
171 /* Generic apd devices */
172#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
173 { "AMD0010", APD_ADDR(cz_i2c_desc) },
174 { "AMDI0010", APD_ADDR(wt_i2c_desc) },
175 { "AMD0020", APD_ADDR(cz_uart_desc) },
176 { "AMDI0020", APD_ADDR(cz_uart_desc) },
177 { "AMD0030", },
178#endif
179#ifdef CONFIG_ARM64
180 { "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
181 { "BRCM900D", APD_ADDR(vulcan_spi_desc) },
182 { "CAV900D", APD_ADDR(vulcan_spi_desc) },
183 { "HISI0A21", APD_ADDR(hip07_i2c_desc) },
184 { "HISI0A22", APD_ADDR(hip08_i2c_desc) },
185#endif
186 { }
187};
188
189static struct acpi_scan_handler apd_handler = {
190 .ids = acpi_apd_device_ids,
191 .attach = acpi_apd_create_device,
192};
193
194void __init acpi_apd_init(void)
195{
196 acpi_scan_add_handler(&apd_handler);
197}