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 { "AMD0030", },
230 { "AMD0040", APD_ADDR(fch_misc_desc)},
231 { "HYGO0010", APD_ADDR(wt_i2c_desc) },
232 #endif
233 #ifdef CONFIG_ARM64
234 { "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
235 { "BRCM900D", APD_ADDR(vulcan_spi_desc) },
236 { "CAV900D", APD_ADDR(vulcan_spi_desc) },
237 { "CAV9007", APD_ADDR(thunderx2_i2c_desc) },
238 { "HISI02A1", APD_ADDR(hip07_i2c_desc) },
239 { "HISI02A2", APD_ADDR(hip08_i2c_desc) },
240 { "HISI02A3", APD_ADDR(hip08_lite_i2c_desc) },
241 { "HISI0173", APD_ADDR(hip08_spi_desc) },
242 { "NXP0001", APD_ADDR(nxp_i2c_desc) },
243 #endif
244 { }
245 };
246
247 static struct acpi_scan_handler apd_handler = {
248 .ids = acpi_apd_device_ids,
249 .attach = acpi_apd_create_device,
250 };
251
acpi_apd_init(void)252 void __init acpi_apd_init(void)
253 {
254 acpi_scan_add_handler(&apd_handler);
255 }
256
