tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
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/clk-provider.h>
11#include <linux/platform_data/clk-st.h>
12#include <linux/platform_device.h>
13#include <linux/pm_domain.h>
14#include <linux/clkdev.h>
15#include <linux/acpi.h>
16#include <linux/err.h>
17#include <linux/io.h>
18#include <linux/pm.h>
19
20#include "internal.h"
21
22ACPI_MODULE_NAME("acpi_apd");
23struct apd_private_data;
24
25/**
26 * ACPI_APD_SYSFS : add device attributes in sysfs
27 * ACPI_APD_PM : attach power domain to device
28 */
29#define ACPI_APD_SYSFS BIT(0)
30#define ACPI_APD_PM BIT(1)
31
32/**
33 * struct apd_device_desc - a descriptor for apd device
34 * @flags: device flags like %ACPI_APD_SYSFS, %ACPI_APD_PM
35 * @fixed_clk_rate: fixed rate input clock source for acpi device;
36 * 0 means no fixed rate input clock source
37 * @setup: a hook routine to set device resource during create platform device
38 *
39 * Device description defined as acpi_device_id.driver_data
40 */
41struct apd_device_desc {
42 unsigned int flags;
43 unsigned int fixed_clk_rate;
44 struct property_entry *properties;
45 int (*setup)(struct apd_private_data *pdata);
46};
47
48struct apd_private_data {
49 struct clk *clk;
50 struct acpi_device *adev;
51 const struct apd_device_desc *dev_desc;
52};
53
54#if defined(CONFIG_X86_AMD_PLATFORM_DEVICE) || defined(CONFIG_ARM64)
55#define APD_ADDR(desc) ((unsigned long)&desc)
56
57static int acpi_apd_setup(struct apd_private_data *pdata)
58{
59 const struct apd_device_desc *dev_desc = pdata->dev_desc;
60 struct clk *clk;
61
62 if (dev_desc->fixed_clk_rate) {
63 clk = clk_register_fixed_rate(&pdata->adev->dev,
64 dev_name(&pdata->adev->dev),
65 NULL, 0, dev_desc->fixed_clk_rate);
66 clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev));
67 pdata->clk = clk;
68 }
69
70 return 0;
71}
72
73#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
74
75static int misc_check_res(struct acpi_resource *ares, void *data)
76{
77 struct resource res;
78
79 return !acpi_dev_resource_memory(ares, &res);
80}
81
82static int st_misc_setup(struct apd_private_data *pdata)
83{
84 struct acpi_device *adev = pdata->adev;
85 struct platform_device *clkdev;
86 struct st_clk_data *clk_data;
87 struct resource_entry *rentry;
88 struct list_head resource_list;
89 int ret;
90
91 clk_data = devm_kzalloc(&adev->dev, sizeof(*clk_data), GFP_KERNEL);
92 if (!clk_data)
93 return -ENOMEM;
94
95 INIT_LIST_HEAD(&resource_list);
96 ret = acpi_dev_get_resources(adev, &resource_list, misc_check_res,
97 NULL);
98 if (ret < 0)
99 return -ENOENT;
100
101 list_for_each_entry(rentry, &resource_list, node) {
102 clk_data->base = devm_ioremap(&adev->dev, rentry->res->start,
103 resource_size(rentry->res));
104 break;
105 }
106
107 acpi_dev_free_resource_list(&resource_list);
108
109 clkdev = platform_device_register_data(&adev->dev, "clk-st",
110 PLATFORM_DEVID_NONE, clk_data,
111 sizeof(*clk_data));
112 return PTR_ERR_OR_ZERO(clkdev);
113}
114
115static const struct apd_device_desc cz_i2c_desc = {
116 .setup = acpi_apd_setup,
117 .fixed_clk_rate = 133000000,
118};
119
120static const struct apd_device_desc wt_i2c_desc = {
121 .setup = acpi_apd_setup,
122 .fixed_clk_rate = 150000000,
123};
124
125static struct property_entry uart_properties[] = {
126 PROPERTY_ENTRY_U32("reg-io-width", 4),
127 PROPERTY_ENTRY_U32("reg-shift", 2),
128 PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
129 { },
130};
131
132static const struct apd_device_desc cz_uart_desc = {
133 .setup = acpi_apd_setup,
134 .fixed_clk_rate = 48000000,
135 .properties = uart_properties,
136};
137
138static const struct apd_device_desc st_misc_desc = {
139 .setup = st_misc_setup,
140};
141#endif
142
143#ifdef CONFIG_ARM64
144static const struct apd_device_desc xgene_i2c_desc = {
145 .setup = acpi_apd_setup,
146 .fixed_clk_rate = 100000000,
147};
148
149static const struct apd_device_desc vulcan_spi_desc = {
150 .setup = acpi_apd_setup,
151 .fixed_clk_rate = 133000000,
152};
153
154static const struct apd_device_desc hip07_i2c_desc = {
155 .setup = acpi_apd_setup,
156 .fixed_clk_rate = 200000000,
157};
158
159static const struct apd_device_desc hip08_i2c_desc = {
160 .setup = acpi_apd_setup,
161 .fixed_clk_rate = 250000000,
162};
163
164static const struct apd_device_desc thunderx2_i2c_desc = {
165 .setup = acpi_apd_setup,
166 .fixed_clk_rate = 125000000,
167};
168
169static const struct apd_device_desc nxp_i2c_desc = {
170 .setup = acpi_apd_setup,
171 .fixed_clk_rate = 350000000,
172};
173
174static const struct apd_device_desc hip08_spi_desc = {
175 .setup = acpi_apd_setup,
176 .fixed_clk_rate = 250000000,
177};
178#endif
179
180#else
181
182#define APD_ADDR(desc) (0UL)
183
184#endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
185
186/**
187* Create platform device during acpi scan attach handle.
188* Return value > 0 on success of creating device.
189*/
190static int acpi_apd_create_device(struct acpi_device *adev,
191 const struct acpi_device_id *id)
192{
193 const struct apd_device_desc *dev_desc = (void *)id->driver_data;
194 struct apd_private_data *pdata;
195 struct platform_device *pdev;
196 int ret;
197
198 if (!dev_desc) {
199 pdev = acpi_create_platform_device(adev, NULL);
200 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
201 }
202
203 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
204 if (!pdata)
205 return -ENOMEM;
206
207 pdata->adev = adev;
208 pdata->dev_desc = dev_desc;
209
210 if (dev_desc->setup) {
211 ret = dev_desc->setup(pdata);
212 if (ret)
213 goto err_out;
214 }
215
216 adev->driver_data = pdata;
217 pdev = acpi_create_platform_device(adev, dev_desc->properties);
218 if (!IS_ERR_OR_NULL(pdev))
219 return 1;
220
221 ret = PTR_ERR(pdev);
222 adev->driver_data = NULL;
223
224 err_out:
225 kfree(pdata);
226 return ret;
227}
228
229static const struct acpi_device_id acpi_apd_device_ids[] = {
230 /* Generic apd devices */
231#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
232 { "AMD0010", APD_ADDR(cz_i2c_desc) },
233 { "AMDI0010", APD_ADDR(wt_i2c_desc) },
234 { "AMD0020", APD_ADDR(cz_uart_desc) },
235 { "AMDI0020", APD_ADDR(cz_uart_desc) },
236 { "AMD0030", },
237 { "AMD0040", APD_ADDR(st_misc_desc)},
238#endif
239#ifdef CONFIG_ARM64
240 { "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
241 { "BRCM900D", APD_ADDR(vulcan_spi_desc) },
242 { "CAV900D", APD_ADDR(vulcan_spi_desc) },
243 { "CAV9007", APD_ADDR(thunderx2_i2c_desc) },
244 { "HISI02A1", APD_ADDR(hip07_i2c_desc) },
245 { "HISI02A2", APD_ADDR(hip08_i2c_desc) },
246 { "HISI0173", APD_ADDR(hip08_spi_desc) },
247 { "NXP0001", APD_ADDR(nxp_i2c_desc) },
248#endif
249 { }
250};
251
252static struct acpi_scan_handler apd_handler = {
253 .ids = acpi_apd_device_ids,
254 .attach = acpi_apd_create_device,
255};
256
257void __init acpi_apd_init(void)
258{
259 acpi_scan_add_handler(&apd_handler);
260}