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