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
63
fch_misc_setup(struct apd_private_data * pdata)64 static 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
109 static const struct apd_device_desc cz_i2c_desc = {
110 .setup = acpi_apd_setup,
111 .fixed_clk_rate = 133000000,
112 };
113
114 static const struct apd_device_desc wt_i2c_desc = {
115 .setup = acpi_apd_setup,
116 .fixed_clk_rate = 150000000,
117 };
118
119 static 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
126 static const struct apd_device_desc cz_uart_desc = {
127 .setup = acpi_apd_setup,
128 .fixed_clk_rate = 48000000,
129 .properties = uart_properties,
130 };
131
132 static 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
138 static const struct apd_device_desc xgene_i2c_desc = {
139 .setup = acpi_apd_setup,
140 .fixed_clk_rate = 100000000,
141 };
142
143 static const struct apd_device_desc vulcan_spi_desc = {
144 .setup = acpi_apd_setup,
145 .fixed_clk_rate = 133000000,
146 };
147
148 static const struct apd_device_desc hip07_i2c_desc = {
149 .setup = acpi_apd_setup,
150 .fixed_clk_rate = 200000000,
151 };
152
153 static const struct apd_device_desc hip08_i2c_desc = {
154 .setup = acpi_apd_setup,
155 .fixed_clk_rate = 250000000,
156 };
157
158 static const struct apd_device_desc hip08_lite_i2c_desc = {
159 .setup = acpi_apd_setup,
160 .fixed_clk_rate = 125000000,
161 };
162
163 static const struct apd_device_desc thunderx2_i2c_desc = {
164 .setup = acpi_apd_setup,
165 .fixed_clk_rate = 125000000,
166 };
167
168 static const struct apd_device_desc nxp_i2c_desc = {
169 .setup = acpi_apd_setup,
170 .fixed_clk_rate = 350000000,
171 };
172
173 static 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 */
acpi_apd_create_device(struct acpi_device * adev,const struct acpi_device_id * id)185 static 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
224 static 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
251 static struct acpi_scan_handler apd_handler = {
252 .ids = acpi_apd_device_ids,
253 .attach = acpi_apd_create_device,
254 };
255
acpi_apd_init(void)256 void __init acpi_apd_init(void)
257 {
258 acpi_scan_add_handler(&apd_handler);
259 }
260