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#endif
110
111#else
112
113#define APD_ADDR(desc) (0UL)
114
115#endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
116
117/**
118* Create platform device during acpi scan attach handle.
119* Return value > 0 on success of creating device.
120*/
121static int acpi_apd_create_device(struct acpi_device *adev,
122				   const struct acpi_device_id *id)
123{
124	const struct apd_device_desc *dev_desc = (void *)id->driver_data;
125	struct apd_private_data *pdata;
126	struct platform_device *pdev;
127	int ret;
128
129	if (!dev_desc) {
130		pdev = acpi_create_platform_device(adev, NULL);
131		return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
132	}
133
134	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
135	if (!pdata)
136		return -ENOMEM;
137
138	pdata->adev = adev;
139	pdata->dev_desc = dev_desc;
140
141	if (dev_desc->setup) {
142		ret = dev_desc->setup(pdata);
143		if (ret)
144			goto err_out;
145	}
146
147	adev->driver_data = pdata;
148	pdev = acpi_create_platform_device(adev, dev_desc->properties);
149	if (!IS_ERR_OR_NULL(pdev))
150		return 1;
151
152	ret = PTR_ERR(pdev);
153	adev->driver_data = NULL;
154
155 err_out:
156	kfree(pdata);
157	return ret;
158}
159
160static const struct acpi_device_id acpi_apd_device_ids[] = {
161	/* Generic apd devices */
162#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
163	{ "AMD0010", APD_ADDR(cz_i2c_desc) },
164	{ "AMDI0010", APD_ADDR(wt_i2c_desc) },
165	{ "AMD0020", APD_ADDR(cz_uart_desc) },
166	{ "AMDI0020", APD_ADDR(cz_uart_desc) },
167	{ "AMD0030", },
168#endif
169#ifdef CONFIG_ARM64
170	{ "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
171	{ "BRCM900D", APD_ADDR(vulcan_spi_desc) },
172#endif
173	{ }
174};
175
176static struct acpi_scan_handler apd_handler = {
177	.ids = acpi_apd_device_ids,
178	.attach = acpi_apd_create_device,
179};
180
181void __init acpi_apd_init(void)
182{
183	acpi_scan_add_handler(&apd_handler);
184}