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};
119static const struct apd_device_desc thunderx2_i2c_desc = {
120	.setup = acpi_apd_setup,
121	.fixed_clk_rate = 125000000,
122};
123#endif
124
125#else
126
127#define APD_ADDR(desc) (0UL)
128
129#endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
130
131/**
132* Create platform device during acpi scan attach handle.
133* Return value > 0 on success of creating device.
134*/
135static int acpi_apd_create_device(struct acpi_device *adev,
136				   const struct acpi_device_id *id)
137{
138	const struct apd_device_desc *dev_desc = (void *)id->driver_data;
139	struct apd_private_data *pdata;
140	struct platform_device *pdev;
141	int ret;
142
143	if (!dev_desc) {
144		pdev = acpi_create_platform_device(adev, NULL);
145		return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
146	}
147
148	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
149	if (!pdata)
150		return -ENOMEM;
151
152	pdata->adev = adev;
153	pdata->dev_desc = dev_desc;
154
155	if (dev_desc->setup) {
156		ret = dev_desc->setup(pdata);
157		if (ret)
158			goto err_out;
159	}
160
161	adev->driver_data = pdata;
162	pdev = acpi_create_platform_device(adev, dev_desc->properties);
163	if (!IS_ERR_OR_NULL(pdev))
164		return 1;
165
166	ret = PTR_ERR(pdev);
167	adev->driver_data = NULL;
168
169 err_out:
170	kfree(pdata);
171	return ret;
172}
173
174static const struct acpi_device_id acpi_apd_device_ids[] = {
175	/* Generic apd devices */
176#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
177	{ "AMD0010", APD_ADDR(cz_i2c_desc) },
178	{ "AMDI0010", APD_ADDR(wt_i2c_desc) },
179	{ "AMD0020", APD_ADDR(cz_uart_desc) },
180	{ "AMDI0020", APD_ADDR(cz_uart_desc) },
181	{ "AMD0030", },
182#endif
183#ifdef CONFIG_ARM64
184	{ "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
185	{ "BRCM900D", APD_ADDR(vulcan_spi_desc) },
186	{ "CAV900D",  APD_ADDR(vulcan_spi_desc) },
187	{ "CAV9007",  APD_ADDR(thunderx2_i2c_desc) },
188	{ "HISI02A1", APD_ADDR(hip07_i2c_desc) },
189	{ "HISI02A2", APD_ADDR(hip08_i2c_desc) },
190#endif
191	{ }
192};
193
194static struct acpi_scan_handler apd_handler = {
195	.ids = acpi_apd_device_ids,
196	.attach = acpi_apd_create_device,
197};
198
199void __init acpi_apd_init(void)
200{
201	acpi_scan_add_handler(&apd_handler);
202}