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 if (!clk_data->name)
87 return -ENOMEM;
88
89 strcpy(clk_data->name, obj->string.pointer);
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
111 static const struct apd_device_desc cz_i2c_desc = {
112 .setup = acpi_apd_setup,
113 .fixed_clk_rate = 133000000,
114 };
115
116 static const struct apd_device_desc wt_i2c_desc = {
117 .setup = acpi_apd_setup,
118 .fixed_clk_rate = 150000000,
119 };
120
121 static const struct apd_device_desc wt_i3c_desc = {
122 .setup = acpi_apd_setup,
123 .fixed_clk_rate = 125000000,
124 };
125
126 static 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
133 static const struct apd_device_desc cz_uart_desc = {
134 .setup = acpi_apd_setup,
135 .fixed_clk_rate = 48000000,
136 .properties = uart_properties,
137 };
138
139 static 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
145 static const struct apd_device_desc xgene_i2c_desc = {
146 .setup = acpi_apd_setup,
147 .fixed_clk_rate = 100000000,
148 };
149
150 static const struct apd_device_desc vulcan_spi_desc = {
151 .setup = acpi_apd_setup,
152 .fixed_clk_rate = 133000000,
153 };
154
155 static const struct apd_device_desc hip07_i2c_desc = {
156 .setup = acpi_apd_setup,
157 .fixed_clk_rate = 200000000,
158 };
159
160 static const struct apd_device_desc hip08_i2c_desc = {
161 .setup = acpi_apd_setup,
162 .fixed_clk_rate = 250000000,
163 };
164
165 static const struct apd_device_desc hip08_lite_i2c_desc = {
166 .setup = acpi_apd_setup,
167 .fixed_clk_rate = 125000000,
168 };
169
170 static const struct apd_device_desc thunderx2_i2c_desc = {
171 .setup = acpi_apd_setup,
172 .fixed_clk_rate = 125000000,
173 };
174
175 static const struct apd_device_desc nxp_i2c_desc = {
176 .setup = acpi_apd_setup,
177 .fixed_clk_rate = 350000000,
178 };
179
180 static 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 */
acpi_apd_create_device(struct acpi_device * adev,const struct acpi_device_id * id)192 static 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
231 static 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
259 static struct acpi_scan_handler apd_handler = {
260 .ids = acpi_apd_device_ids,
261 .attach = acpi_apd_create_device,
262 };
263
acpi_apd_init(void)264 void __init acpi_apd_init(void)
265 {
266 acpi_scan_add_handler(&apd_handler);
267 }
268