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
 63
 64static int fch_misc_setup(struct apd_private_data *pdata)
 65{
 66	struct acpi_device *adev = pdata->adev;
 67	const union acpi_object *obj;
 68	struct platform_device *clkdev;
 69	struct fch_clk_data *clk_data;
 70	struct resource_entry *rentry;
 71	struct list_head resource_list;
 72	int ret;
 73
 74	clk_data = devm_kzalloc(&adev->dev, sizeof(*clk_data), GFP_KERNEL);
 75	if (!clk_data)
 76		return -ENOMEM;
 77
 78	INIT_LIST_HEAD(&resource_list);
 79	ret = acpi_dev_get_memory_resources(adev, &resource_list);
 80	if (ret < 0)
 81		return -ENOENT;
 82
 83	if (!acpi_dev_get_property(adev, "clk-name", ACPI_TYPE_STRING, &obj)) {
 84		clk_data->name = devm_kzalloc(&adev->dev, obj->string.length,
 85					      GFP_KERNEL);
 86		if (!clk_data->name)
 87			return -ENOMEM;
 88
 89		strscpy(clk_data->name, obj->string.pointer, obj->string.length);
 90	} else {
 91		/* Set default name to mclk if entry missing in firmware */
 92		clk_data->name = "mclk";
 93	}
 94
 95	list_for_each_entry(rentry, &resource_list, node) {
 96		clk_data->base = devm_ioremap(&adev->dev, rentry->res->start,
 97					      resource_size(rentry->res));
 98		break;
 99	}
100	if (!clk_data->base)
101		return -ENOMEM;
102
103	acpi_dev_free_resource_list(&resource_list);
104
105	clkdev = platform_device_register_data(&adev->dev, "clk-fch",
106					       PLATFORM_DEVID_NONE, clk_data,
107					       sizeof(*clk_data));
108	return PTR_ERR_OR_ZERO(clkdev);
109}
110
111static const struct apd_device_desc cz_i2c_desc = {
112	.setup = acpi_apd_setup,
113	.fixed_clk_rate = 133000000,
114};
115
116static const struct apd_device_desc wt_i2c_desc = {
117	.setup = acpi_apd_setup,
118	.fixed_clk_rate = 150000000,
119};
120
121static const struct apd_device_desc wt_i3c_desc = {
122	.setup = acpi_apd_setup,
123	.fixed_clk_rate = 125000000,
124};
125
126static struct property_entry uart_properties[] = {
127	PROPERTY_ENTRY_U32("reg-io-width", 4),
128	PROPERTY_ENTRY_U32("reg-shift", 2),
129	PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
130	{ },
131};
132
133static const struct apd_device_desc cz_uart_desc = {
134	.setup = acpi_apd_setup,
135	.fixed_clk_rate = 48000000,
136	.properties = uart_properties,
137};
138
139static const struct apd_device_desc fch_misc_desc = {
140	.setup = fch_misc_setup,
141};
142#endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
143
144#ifdef CONFIG_ARM64
145static const struct apd_device_desc xgene_i2c_desc = {
146	.setup = acpi_apd_setup,
147	.fixed_clk_rate = 100000000,
148};
149
150static const struct apd_device_desc vulcan_spi_desc = {
151	.setup = acpi_apd_setup,
152	.fixed_clk_rate = 133000000,
153};
154
155static const struct apd_device_desc hip07_i2c_desc = {
156	.setup = acpi_apd_setup,
157	.fixed_clk_rate = 200000000,
158};
159
160static const struct apd_device_desc hip08_i2c_desc = {
161	.setup = acpi_apd_setup,
162	.fixed_clk_rate = 250000000,
163};
164
165static const struct apd_device_desc hip08_lite_i2c_desc = {
166	.setup = acpi_apd_setup,
167	.fixed_clk_rate = 125000000,
168};
169
170static const struct apd_device_desc thunderx2_i2c_desc = {
171	.setup = acpi_apd_setup,
172	.fixed_clk_rate = 125000000,
173};
174
175static const struct apd_device_desc nxp_i2c_desc = {
176	.setup = acpi_apd_setup,
177	.fixed_clk_rate = 350000000,
178};
179
180static const struct apd_device_desc hip08_spi_desc = {
181	.setup = acpi_apd_setup,
182	.fixed_clk_rate = 250000000,
183};
184#endif /* CONFIG_ARM64 */
185
186#endif
187
188/*
189 * Create platform device during acpi scan attach handle.
190 * Return value > 0 on success of creating device.
191 */
192static int acpi_apd_create_device(struct acpi_device *adev,
193				   const struct acpi_device_id *id)
194{
195	const struct apd_device_desc *dev_desc = (void *)id->driver_data;
196	struct apd_private_data *pdata;
197	struct platform_device *pdev;
198	int ret;
199
200	if (!dev_desc) {
201		pdev = acpi_create_platform_device(adev, NULL);
202		return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
203	}
204
205	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
206	if (!pdata)
207		return -ENOMEM;
208
209	pdata->adev = adev;
210	pdata->dev_desc = dev_desc;
211
212	if (dev_desc->setup) {
213		ret = dev_desc->setup(pdata);
214		if (ret)
215			goto err_out;
216	}
217
218	adev->driver_data = pdata;
219	pdev = acpi_create_platform_device(adev, dev_desc->properties);
220	if (!IS_ERR_OR_NULL(pdev))
221		return 1;
222
223	ret = PTR_ERR(pdev);
224	adev->driver_data = NULL;
225
226 err_out:
227	kfree(pdata);
228	return ret;
229}
230
231static const struct acpi_device_id acpi_apd_device_ids[] = {
232	/* Generic apd devices */
233#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
234	{ "AMD0010", APD_ADDR(cz_i2c_desc) },
235	{ "AMD0020", APD_ADDR(cz_uart_desc) },
236	{ "AMD0030", },
237	{ "AMD0040", APD_ADDR(fch_misc_desc)},
238	{ "AMDI0010", APD_ADDR(wt_i2c_desc) },
239	{ "AMDI0015", APD_ADDR(wt_i3c_desc) },
240	{ "AMDI0019", APD_ADDR(wt_i2c_desc) },
241	{ "AMDI0020", APD_ADDR(cz_uart_desc) },
242	{ "AMDI0022", APD_ADDR(cz_uart_desc) },
243	{ "HYGO0010", APD_ADDR(wt_i2c_desc) },
244#endif
245#ifdef CONFIG_ARM64
246	{ "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
247	{ "BRCM900D", APD_ADDR(vulcan_spi_desc) },
248	{ "CAV900D",  APD_ADDR(vulcan_spi_desc) },
249	{ "CAV9007",  APD_ADDR(thunderx2_i2c_desc) },
250	{ "HISI02A1", APD_ADDR(hip07_i2c_desc) },
251	{ "HISI02A2", APD_ADDR(hip08_i2c_desc) },
252	{ "HISI02A3", APD_ADDR(hip08_lite_i2c_desc) },
253	{ "HISI0173", APD_ADDR(hip08_spi_desc) },
254	{ "NXP0001", APD_ADDR(nxp_i2c_desc) },
255#endif
256	{ }
257};
258
259static struct acpi_scan_handler apd_handler = {
260	.ids = acpi_apd_device_ids,
261	.attach = acpi_apd_create_device,
262};
263
264void __init acpi_apd_init(void)
265{
266	acpi_scan_add_handler(&apd_handler);
267}