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	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#if defined(CONFIG_X86_AMD_PLATFORM_DEVICE) || defined(CONFIG_ARM64)
 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
 74#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
 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#endif
 85
 86#ifdef CONFIG_ARM64
 87static struct apd_device_desc xgene_i2c_desc = {
 88	.setup = acpi_apd_setup,
 89	.fixed_clk_rate = 100000000,
 90};
 91#endif
 92
 93#else
 94
 95#define APD_ADDR(desc) (0UL)
 96
 97#endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
 98
 99/**
100* Create platform device during acpi scan attach handle.
101* Return value > 0 on success of creating device.
102*/
103static int acpi_apd_create_device(struct acpi_device *adev,
104				   const struct acpi_device_id *id)
105{
106	const struct apd_device_desc *dev_desc = (void *)id->driver_data;
107	struct apd_private_data *pdata;
108	struct platform_device *pdev;
109	int ret;
110
111	if (!dev_desc) {
112		pdev = acpi_create_platform_device(adev);
113		return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
114	}
115
116	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
117	if (!pdata)
118		return -ENOMEM;
119
120	pdata->adev = adev;
121	pdata->dev_desc = dev_desc;
122
123	if (dev_desc->setup) {
124		ret = dev_desc->setup(pdata);
125		if (ret)
126			goto err_out;
127	}
128
129	adev->driver_data = pdata;
130	pdev = acpi_create_platform_device(adev);
131	if (!IS_ERR_OR_NULL(pdev))
132		return 1;
133
134	ret = PTR_ERR(pdev);
135	adev->driver_data = NULL;
136
137 err_out:
138	kfree(pdata);
139	return ret;
140}
141
142static const struct acpi_device_id acpi_apd_device_ids[] = {
143	/* Generic apd devices */
144#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
145	{ "AMD0010", APD_ADDR(cz_i2c_desc) },
146	{ "AMDI0010", APD_ADDR(cz_i2c_desc) },
147	{ "AMD0020", APD_ADDR(cz_uart_desc) },
148	{ "AMDI0020", APD_ADDR(cz_uart_desc) },
149	{ "AMD0030", },
150#endif
151#ifdef CONFIG_ARM64
152	{ "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
153#endif
154	{ }
155};
156
157static struct acpi_scan_handler apd_handler = {
158	.ids = acpi_apd_device_ids,
159	.attach = acpi_apd_create_device,
160};
161
162void __init acpi_apd_init(void)
163{
164	acpi_scan_add_handler(&apd_handler);
165}