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 
20 struct 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  */
31 struct apd_device_desc {
32 	unsigned int fixed_clk_rate;
33 	struct property_entry *properties;
34 	int (*setup)(struct apd_private_data *pdata);
35 };
36 
37 struct 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 
acpi_apd_setup(struct apd_private_data * pdata)46 static 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
misc_check_res(struct acpi_resource * ares,void * data)63 static 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 
fch_misc_setup(struct apd_private_data * pdata)70 static 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 
107 static const struct apd_device_desc cz_i2c_desc = {
108 	.setup = acpi_apd_setup,
109 	.fixed_clk_rate = 133000000,
110 };
111 
112 static const struct apd_device_desc wt_i2c_desc = {
113 	.setup = acpi_apd_setup,
114 	.fixed_clk_rate = 150000000,
115 };
116 
117 static 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 
124 static const struct apd_device_desc cz_uart_desc = {
125 	.setup = acpi_apd_setup,
126 	.fixed_clk_rate = 48000000,
127 	.properties = uart_properties,
128 };
129 
130 static 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
136 static const struct apd_device_desc xgene_i2c_desc = {
137 	.setup = acpi_apd_setup,
138 	.fixed_clk_rate = 100000000,
139 };
140 
141 static const struct apd_device_desc vulcan_spi_desc = {
142 	.setup = acpi_apd_setup,
143 	.fixed_clk_rate = 133000000,
144 };
145 
146 static const struct apd_device_desc hip07_i2c_desc = {
147 	.setup = acpi_apd_setup,
148 	.fixed_clk_rate = 200000000,
149 };
150 
151 static const struct apd_device_desc hip08_i2c_desc = {
152 	.setup = acpi_apd_setup,
153 	.fixed_clk_rate = 250000000,
154 };
155 
156 static const struct apd_device_desc hip08_lite_i2c_desc = {
157 	.setup = acpi_apd_setup,
158 	.fixed_clk_rate = 125000000,
159 };
160 
161 static const struct apd_device_desc thunderx2_i2c_desc = {
162 	.setup = acpi_apd_setup,
163 	.fixed_clk_rate = 125000000,
164 };
165 
166 static const struct apd_device_desc nxp_i2c_desc = {
167 	.setup = acpi_apd_setup,
168 	.fixed_clk_rate = 350000000,
169 };
170 
171 static 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  */
acpi_apd_create_device(struct acpi_device * adev,const struct acpi_device_id * id)183 static 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 
222 static 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 
248 static struct acpi_scan_handler apd_handler = {
249 	.ids = acpi_apd_device_ids,
250 	.attach = acpi_apd_create_device,
251 };
252 
acpi_apd_init(void)253 void __init acpi_apd_init(void)
254 {
255 	acpi_scan_add_handler(&apd_handler);
256 }
257