1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * AMD ACPI support for ACPI2platform device.
  4 *
  5 * Copyright (c) 2014,2015 AMD Corporation.
  6 * Authors: Ken Xue <Ken.Xue@amd.com>
  7 *	Wu, Jeff <Jeff.Wu@amd.com>
  8 */
  9
 10#include <linux/acpi.h>
 11#include <linux/clkdev.h>
 12#include <linux/clk-provider.h>
 13#include <linux/err.h>
 14#include <linux/io.h>
 15#include <linux/platform_data/clk-fch.h>
 16#include <linux/platform_device.h>
 17
 18#include "internal.h"
 19
 20struct apd_private_data;
 21
 22/**
 23 * struct apd_device_desc - a descriptor for apd device
 24 * @fixed_clk_rate: fixed rate input clock source for acpi device;
 25 *			0 means no fixed rate input clock source
 26 * @properties: build-in properties of the device such as UART
 27 * @setup: a hook routine to set device resource during create platform device
 28 *
 29 * Device description defined as acpi_device_id.driver_data
 30 */
 31struct apd_device_desc {
 32	unsigned int fixed_clk_rate;
 33	struct property_entry *properties;
 34	int (*setup)(struct apd_private_data *pdata);
 35};
 36
 37struct apd_private_data {
 38	struct clk *clk;
 39	struct acpi_device *adev;
 40	const struct apd_device_desc *dev_desc;
 41};
 42
 43#if defined(CONFIG_X86_AMD_PLATFORM_DEVICE) || defined(CONFIG_ARM64)
 44#define APD_ADDR(desc)	((unsigned long)&desc)
 45
 46static int acpi_apd_setup(struct apd_private_data *pdata)
 47{
 48	const struct apd_device_desc *dev_desc = pdata->dev_desc;
 49	struct clk *clk;
 50
 51	if (dev_desc->fixed_clk_rate) {
 52		clk = clk_register_fixed_rate(&pdata->adev->dev,
 53					dev_name(&pdata->adev->dev),
 54					NULL, 0, dev_desc->fixed_clk_rate);
 55		clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev));
 56		pdata->clk = clk;
 57	}
 58
 59	return 0;
 60}
 61
 62#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
 63static int misc_check_res(struct acpi_resource *ares, void *data)
 64{
 65	struct resource res;
 66
 67	return !acpi_dev_resource_memory(ares, &res);
 68}
 69
 70static int fch_misc_setup(struct apd_private_data *pdata)
 71{
 72	struct acpi_device *adev = pdata->adev;
 73	const union acpi_object *obj;
 74	struct platform_device *clkdev;
 75	struct fch_clk_data *clk_data;
 76	struct resource_entry *rentry;
 77	struct list_head resource_list;
 78	int ret;
 79
 80	clk_data = devm_kzalloc(&adev->dev, sizeof(*clk_data), GFP_KERNEL);
 81	if (!clk_data)
 82		return -ENOMEM;
 83
 84	INIT_LIST_HEAD(&resource_list);
 85	ret = acpi_dev_get_resources(adev, &resource_list, misc_check_res,
 86				     NULL);
 87	if (ret < 0)
 88		return -ENOENT;
 89
 90	if (!acpi_dev_get_property(adev, "is-rv", ACPI_TYPE_INTEGER, &obj))
 91		clk_data->is_rv = obj->integer.value;
 92
 93	list_for_each_entry(rentry, &resource_list, node) {
 94		clk_data->base = devm_ioremap(&adev->dev, rentry->res->start,
 95					      resource_size(rentry->res));
 96		break;
 97	}
 98
 99	acpi_dev_free_resource_list(&resource_list);
100
101	clkdev = platform_device_register_data(&adev->dev, "clk-fch",
102					       PLATFORM_DEVID_NONE, clk_data,
103					       sizeof(*clk_data));
104	return PTR_ERR_OR_ZERO(clkdev);
105}
106
107static const struct apd_device_desc cz_i2c_desc = {
108	.setup = acpi_apd_setup,
109	.fixed_clk_rate = 133000000,
110};
111
112static const struct apd_device_desc wt_i2c_desc = {
113	.setup = acpi_apd_setup,
114	.fixed_clk_rate = 150000000,
115};
116
117static struct property_entry uart_properties[] = {
118	PROPERTY_ENTRY_U32("reg-io-width", 4),
119	PROPERTY_ENTRY_U32("reg-shift", 2),
120	PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
121	{ },
122};
123
124static const struct apd_device_desc cz_uart_desc = {
125	.setup = acpi_apd_setup,
126	.fixed_clk_rate = 48000000,
127	.properties = uart_properties,
128};
129
130static const struct apd_device_desc fch_misc_desc = {
131	.setup = fch_misc_setup,
132};
133#endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
134
135#ifdef CONFIG_ARM64
136static const struct apd_device_desc xgene_i2c_desc = {
137	.setup = acpi_apd_setup,
138	.fixed_clk_rate = 100000000,
139};
140
141static const struct apd_device_desc vulcan_spi_desc = {
142	.setup = acpi_apd_setup,
143	.fixed_clk_rate = 133000000,
144};
145
146static const struct apd_device_desc hip07_i2c_desc = {
147	.setup = acpi_apd_setup,
148	.fixed_clk_rate = 200000000,
149};
150
151static const struct apd_device_desc hip08_i2c_desc = {
152	.setup = acpi_apd_setup,
153	.fixed_clk_rate = 250000000,
154};
155
156static const struct apd_device_desc hip08_lite_i2c_desc = {
157	.setup = acpi_apd_setup,
158	.fixed_clk_rate = 125000000,
159};
160
161static const struct apd_device_desc thunderx2_i2c_desc = {
162	.setup = acpi_apd_setup,
163	.fixed_clk_rate = 125000000,
164};
165
166static const struct apd_device_desc nxp_i2c_desc = {
167	.setup = acpi_apd_setup,
168	.fixed_clk_rate = 350000000,
169};
170
171static const struct apd_device_desc hip08_spi_desc = {
172	.setup = acpi_apd_setup,
173	.fixed_clk_rate = 250000000,
174};
175#endif /* CONFIG_ARM64 */
176
177#endif
178
179/*
180 * Create platform device during acpi scan attach handle.
181 * Return value > 0 on success of creating device.
182 */
183static int acpi_apd_create_device(struct acpi_device *adev,
184				   const struct acpi_device_id *id)
185{
186	const struct apd_device_desc *dev_desc = (void *)id->driver_data;
187	struct apd_private_data *pdata;
188	struct platform_device *pdev;
189	int ret;
190
191	if (!dev_desc) {
192		pdev = acpi_create_platform_device(adev, NULL);
193		return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
194	}
195
196	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
197	if (!pdata)
198		return -ENOMEM;
199
200	pdata->adev = adev;
201	pdata->dev_desc = dev_desc;
202
203	if (dev_desc->setup) {
204		ret = dev_desc->setup(pdata);
205		if (ret)
206			goto err_out;
207	}
208
209	adev->driver_data = pdata;
210	pdev = acpi_create_platform_device(adev, dev_desc->properties);
211	if (!IS_ERR_OR_NULL(pdev))
212		return 1;
213
214	ret = PTR_ERR(pdev);
215	adev->driver_data = NULL;
216
217 err_out:
218	kfree(pdata);
219	return ret;
220}
221
222static const struct acpi_device_id acpi_apd_device_ids[] = {
223	/* Generic apd devices */
224#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
225	{ "AMD0010", APD_ADDR(cz_i2c_desc) },
226	{ "AMDI0010", APD_ADDR(wt_i2c_desc) },
227	{ "AMD0020", APD_ADDR(cz_uart_desc) },
228	{ "AMDI0020", APD_ADDR(cz_uart_desc) },
229	{ "AMDI0022", APD_ADDR(cz_uart_desc) },
230	{ "AMD0030", },
231	{ "AMD0040", APD_ADDR(fch_misc_desc)},
232	{ "HYGO0010", APD_ADDR(wt_i2c_desc) },
233#endif
234#ifdef CONFIG_ARM64
235	{ "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
236	{ "BRCM900D", APD_ADDR(vulcan_spi_desc) },
237	{ "CAV900D",  APD_ADDR(vulcan_spi_desc) },
238	{ "CAV9007",  APD_ADDR(thunderx2_i2c_desc) },
239	{ "HISI02A1", APD_ADDR(hip07_i2c_desc) },
240	{ "HISI02A2", APD_ADDR(hip08_i2c_desc) },
241	{ "HISI02A3", APD_ADDR(hip08_lite_i2c_desc) },
242	{ "HISI0173", APD_ADDR(hip08_spi_desc) },
243	{ "NXP0001", APD_ADDR(nxp_i2c_desc) },
244#endif
245	{ }
246};
247
248static struct acpi_scan_handler apd_handler = {
249	.ids = acpi_apd_device_ids,
250	.attach = acpi_apd_create_device,
251};
252
253void __init acpi_apd_init(void)
254{
255	acpi_scan_add_handler(&apd_handler);
256}