tjh.dev
Linux kernel mirror (for testing)
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linux
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
20struct 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 */
31struct apd_device_desc {
32 unsigned int fixed_clk_rate;
33 struct property_entry *properties;
34 int (*setup)(struct apd_private_data *pdata);
35};
36
37struct 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
46static 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
63static 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
70static 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, "clk-name", ACPI_TYPE_STRING, &obj)) {
91 clk_data->name = devm_kzalloc(&adev->dev, obj->string.length,
92 GFP_KERNEL);
93
94 strcpy(clk_data->name, obj->string.pointer);
95 } else {
96 /* Set default name to mclk if entry missing in firmware */
97 clk_data->name = "mclk";
98 }
99
100 list_for_each_entry(rentry, &resource_list, node) {
101 clk_data->base = devm_ioremap(&adev->dev, rentry->res->start,
102 resource_size(rentry->res));
103 break;
104 }
105 if (!clk_data->base)
106 return -ENOMEM;
107
108 acpi_dev_free_resource_list(&resource_list);
109
110 clkdev = platform_device_register_data(&adev->dev, "clk-fch",
111 PLATFORM_DEVID_NONE, clk_data,
112 sizeof(*clk_data));
113 return PTR_ERR_OR_ZERO(clkdev);
114}
115
116static const struct apd_device_desc cz_i2c_desc = {
117 .setup = acpi_apd_setup,
118 .fixed_clk_rate = 133000000,
119};
120
121static const struct apd_device_desc wt_i2c_desc = {
122 .setup = acpi_apd_setup,
123 .fixed_clk_rate = 150000000,
124};
125
126static 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
133static const struct apd_device_desc cz_uart_desc = {
134 .setup = acpi_apd_setup,
135 .fixed_clk_rate = 48000000,
136 .properties = uart_properties,
137};
138
139static 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
145static const struct apd_device_desc xgene_i2c_desc = {
146 .setup = acpi_apd_setup,
147 .fixed_clk_rate = 100000000,
148};
149
150static const struct apd_device_desc vulcan_spi_desc = {
151 .setup = acpi_apd_setup,
152 .fixed_clk_rate = 133000000,
153};
154
155static const struct apd_device_desc hip07_i2c_desc = {
156 .setup = acpi_apd_setup,
157 .fixed_clk_rate = 200000000,
158};
159
160static const struct apd_device_desc hip08_i2c_desc = {
161 .setup = acpi_apd_setup,
162 .fixed_clk_rate = 250000000,
163};
164
165static const struct apd_device_desc hip08_lite_i2c_desc = {
166 .setup = acpi_apd_setup,
167 .fixed_clk_rate = 125000000,
168};
169
170static const struct apd_device_desc thunderx2_i2c_desc = {
171 .setup = acpi_apd_setup,
172 .fixed_clk_rate = 125000000,
173};
174
175static const struct apd_device_desc nxp_i2c_desc = {
176 .setup = acpi_apd_setup,
177 .fixed_clk_rate = 350000000,
178};
179
180static 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 */
192static 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
231static 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 { "AMDI0010", APD_ADDR(wt_i2c_desc) },
236 { "AMD0020", APD_ADDR(cz_uart_desc) },
237 { "AMDI0020", APD_ADDR(cz_uart_desc) },
238 { "AMDI0022", APD_ADDR(cz_uart_desc) },
239 { "AMD0030", },
240 { "AMD0040", APD_ADDR(fch_misc_desc)},
241 { "HYGO0010", APD_ADDR(wt_i2c_desc) },
242#endif
243#ifdef CONFIG_ARM64
244 { "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
245 { "BRCM900D", APD_ADDR(vulcan_spi_desc) },
246 { "CAV900D", APD_ADDR(vulcan_spi_desc) },
247 { "CAV9007", APD_ADDR(thunderx2_i2c_desc) },
248 { "HISI02A1", APD_ADDR(hip07_i2c_desc) },
249 { "HISI02A2", APD_ADDR(hip08_i2c_desc) },
250 { "HISI02A3", APD_ADDR(hip08_lite_i2c_desc) },
251 { "HISI0173", APD_ADDR(hip08_spi_desc) },
252 { "NXP0001", APD_ADDR(nxp_i2c_desc) },
253#endif
254 { }
255};
256
257static struct acpi_scan_handler apd_handler = {
258 .ids = acpi_apd_device_ids,
259 .attach = acpi_apd_create_device,
260};
261
262void __init acpi_apd_init(void)
263{
264 acpi_scan_add_handler(&apd_handler);
265}