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
24ACPI_MODULE_NAME("acpi_apd");
25struct 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 */
43struct apd_device_desc {
44	unsigned int flags;
45	unsigned int fixed_clk_rate;
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#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
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, 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
75static struct apd_device_desc cz_i2c_desc = {
76	.setup = acpi_apd_setup,
77	.fixed_clk_rate = 133000000,
78};
79
80static 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*/
95static 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
134static 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
142static struct acpi_scan_handler apd_handler = {
143	.ids = acpi_apd_device_ids,
144	.attach = acpi_apd_create_device,
145};
146
147void __init acpi_apd_init(void)
148{
149	acpi_scan_add_handler(&apd_handler);
150}
151