1 /*
2 * AMD ACPI support for ACPI2platform device.
3 *
4 * Copyright (c) 2014,2015 AMD Corporation.
5 * Authors: Ken Xue <Ken.Xue@amd.com>
6 * Wu, Jeff <Jeff.Wu@amd.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/clk-provider.h>
14 #include <linux/platform_data/clk-st.h>
15 #include <linux/platform_device.h>
16 #include <linux/pm_domain.h>
17 #include <linux/clkdev.h>
18 #include <linux/acpi.h>
19 #include <linux/err.h>
20 #include <linux/pm.h>
21
22 #include "internal.h"
23
24 ACPI_MODULE_NAME("acpi_apd");
25 struct apd_private_data;
26
27 /**
28 * ACPI_APD_SYSFS : add device attributes in sysfs
29 * ACPI_APD_PM : attach power domain to device
30 */
31 #define ACPI_APD_SYSFS BIT(0)
32 #define ACPI_APD_PM BIT(1)
33
34 /**
35 * struct apd_device_desc - a descriptor for apd device
36 * @flags: device flags like %ACPI_APD_SYSFS, %ACPI_APD_PM
37 * @fixed_clk_rate: fixed rate input clock source for acpi device;
38 * 0 means no fixed rate input clock source
39 * @setup: a hook routine to set device resource during create platform device
40 *
41 * Device description defined as acpi_device_id.driver_data
42 */
43 struct apd_device_desc {
44 unsigned int flags;
45 unsigned int fixed_clk_rate;
46 struct property_entry *properties;
47 int (*setup)(struct apd_private_data *pdata);
48 };
49
50 struct apd_private_data {
51 struct clk *clk;
52 struct acpi_device *adev;
53 const struct apd_device_desc *dev_desc;
54 };
55
56 #if defined(CONFIG_X86_AMD_PLATFORM_DEVICE) || defined(CONFIG_ARM64)
57 #define APD_ADDR(desc) ((unsigned long)&desc)
58
acpi_apd_setup(struct apd_private_data * pdata)59 static int acpi_apd_setup(struct apd_private_data *pdata)
60 {
61 const struct apd_device_desc *dev_desc = pdata->dev_desc;
62 struct clk *clk = ERR_PTR(-ENODEV);
63
64 if (dev_desc->fixed_clk_rate) {
65 clk = clk_register_fixed_rate(&pdata->adev->dev,
66 dev_name(&pdata->adev->dev),
67 NULL, 0, dev_desc->fixed_clk_rate);
68 clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev));
69 pdata->clk = clk;
70 }
71
72 return 0;
73 }
74
75 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
76
misc_check_res(struct acpi_resource * ares,void * data)77 static int misc_check_res(struct acpi_resource *ares, void *data)
78 {
79 struct resource res;
80
81 return !acpi_dev_resource_memory(ares, &res);
82 }
83
st_misc_setup(struct apd_private_data * pdata)84 static int st_misc_setup(struct apd_private_data *pdata)
85 {
86 struct acpi_device *adev = pdata->adev;
87 struct platform_device *clkdev;
88 struct st_clk_data *clk_data;
89 struct resource_entry *rentry;
90 struct list_head resource_list;
91 int ret;
92
93 clk_data = devm_kzalloc(&adev->dev, sizeof(*clk_data), GFP_KERNEL);
94 if (!clk_data)
95 return -ENOMEM;
96
97 INIT_LIST_HEAD(&resource_list);
98 ret = acpi_dev_get_resources(adev, &resource_list, misc_check_res,
99 NULL);
100 if (ret < 0)
101 return -ENOENT;
102
103 list_for_each_entry(rentry, &resource_list, node) {
104 clk_data->base = devm_ioremap(&adev->dev, rentry->res->start,
105 resource_size(rentry->res));
106 break;
107 }
108
109 acpi_dev_free_resource_list(&resource_list);
110
111 clkdev = platform_device_register_data(&adev->dev, "clk-st",
112 PLATFORM_DEVID_NONE, clk_data,
113 sizeof(*clk_data));
114 return PTR_ERR_OR_ZERO(clkdev);
115 }
116
117 static const struct apd_device_desc cz_i2c_desc = {
118 .setup = acpi_apd_setup,
119 .fixed_clk_rate = 133000000,
120 };
121
122 static const struct apd_device_desc wt_i2c_desc = {
123 .setup = acpi_apd_setup,
124 .fixed_clk_rate = 150000000,
125 };
126
127 static struct property_entry uart_properties[] = {
128 PROPERTY_ENTRY_U32("reg-io-width", 4),
129 PROPERTY_ENTRY_U32("reg-shift", 2),
130 PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
131 { },
132 };
133
134 static const struct apd_device_desc cz_uart_desc = {
135 .setup = acpi_apd_setup,
136 .fixed_clk_rate = 48000000,
137 .properties = uart_properties,
138 };
139
140 static const struct apd_device_desc st_misc_desc = {
141 .setup = st_misc_setup,
142 };
143 #endif
144
145 #ifdef CONFIG_ARM64
146 static const struct apd_device_desc xgene_i2c_desc = {
147 .setup = acpi_apd_setup,
148 .fixed_clk_rate = 100000000,
149 };
150
151 static const struct apd_device_desc vulcan_spi_desc = {
152 .setup = acpi_apd_setup,
153 .fixed_clk_rate = 133000000,
154 };
155
156 static const struct apd_device_desc hip07_i2c_desc = {
157 .setup = acpi_apd_setup,
158 .fixed_clk_rate = 200000000,
159 };
160
161 static const struct apd_device_desc hip08_i2c_desc = {
162 .setup = acpi_apd_setup,
163 .fixed_clk_rate = 250000000,
164 };
165 static const struct apd_device_desc thunderx2_i2c_desc = {
166 .setup = acpi_apd_setup,
167 .fixed_clk_rate = 125000000,
168 };
169 #endif
170
171 #else
172
173 #define APD_ADDR(desc) (0UL)
174
175 #endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
176
177 /**
178 * Create platform device during acpi scan attach handle.
179 * Return value > 0 on success of creating device.
180 */
acpi_apd_create_device(struct acpi_device * adev,const struct acpi_device_id * id)181 static int acpi_apd_create_device(struct acpi_device *adev,
182 const struct acpi_device_id *id)
183 {
184 const struct apd_device_desc *dev_desc = (void *)id->driver_data;
185 struct apd_private_data *pdata;
186 struct platform_device *pdev;
187 int ret;
188
189 if (!dev_desc) {
190 pdev = acpi_create_platform_device(adev, NULL);
191 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
192 }
193
194 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
195 if (!pdata)
196 return -ENOMEM;
197
198 pdata->adev = adev;
199 pdata->dev_desc = dev_desc;
200
201 if (dev_desc->setup) {
202 ret = dev_desc->setup(pdata);
203 if (ret)
204 goto err_out;
205 }
206
207 adev->driver_data = pdata;
208 pdev = acpi_create_platform_device(adev, dev_desc->properties);
209 if (!IS_ERR_OR_NULL(pdev))
210 return 1;
211
212 ret = PTR_ERR(pdev);
213 adev->driver_data = NULL;
214
215 err_out:
216 kfree(pdata);
217 return ret;
218 }
219
220 static const struct acpi_device_id acpi_apd_device_ids[] = {
221 /* Generic apd devices */
222 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
223 { "AMD0010", APD_ADDR(cz_i2c_desc) },
224 { "AMDI0010", APD_ADDR(wt_i2c_desc) },
225 { "AMD0020", APD_ADDR(cz_uart_desc) },
226 { "AMDI0020", APD_ADDR(cz_uart_desc) },
227 { "AMD0030", },
228 { "AMD0040", APD_ADDR(st_misc_desc)},
229 #endif
230 #ifdef CONFIG_ARM64
231 { "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
232 { "BRCM900D", APD_ADDR(vulcan_spi_desc) },
233 { "CAV900D", APD_ADDR(vulcan_spi_desc) },
234 { "CAV9007", APD_ADDR(thunderx2_i2c_desc) },
235 { "HISI02A1", APD_ADDR(hip07_i2c_desc) },
236 { "HISI02A2", APD_ADDR(hip08_i2c_desc) },
237 #endif
238 { }
239 };
240
241 static struct acpi_scan_handler apd_handler = {
242 .ids = acpi_apd_device_ids,
243 .attach = acpi_apd_create_device,
244 };
245
acpi_apd_init(void)246 void __init acpi_apd_init(void)
247 {
248 acpi_scan_add_handler(&apd_handler);
249 }
250
