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gerrit.nordix.org / codeaurora / cp-linux / 7d38e033b98fd00da3a0b3a506c27c772f7167bf / . / drivers / soc / versatile / soc-realview.c
blob: e642c4540dda123a39b9ff42437f34f64f3bad06 [file] [log] [blame]
Kyle Swenson8d8f6542021-03-15 11:02:55 -0600[diff] [blame]1/*
2 * Copyright (C) 2014 Linaro Ltd.
3 *
4 * Author: Linus Walleij <linus.walleij@linaro.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2, as
8 * published by the Free Software Foundation.
9 *
10 */
11#include <linux/init.h>
12#include <linux/io.h>
13#include <linux/slab.h>
14#include <linux/sys_soc.h>
15#include <linux/platform_device.h>
16#include <linux/mfd/syscon.h>
17#include <linux/regmap.h>
18#include <linux/of.h>
19
20/* System ID in syscon */
21#define REALVIEW_SYS_ID_OFFSET 0x00
22
23static const struct of_device_id realview_soc_of_match[] = {
24 { .compatible = "arm,realview-eb-soc", },
25 { .compatible = "arm,realview-pb1176-soc", },
26 { .compatible = "arm,realview-pb11mp-soc", },
27 { .compatible = "arm,realview-pba8-soc", },
28 { .compatible = "arm,realview-pbx-soc", },
29 { }
30};
31
32static u32 realview_coreid;
33
34static const char *realview_board_str(u32 id)
35{
36 switch ((id >> 16) & 0xfff) {
37 case 0x0147:
38 return "HBI-0147";
39 default:
40 return "Unknown";
41 }
42}
43
44static const char *realview_arch_str(u32 id)
45{
46 switch ((id >> 8) & 0xf) {
47 case 0x05:
48 return "Multi-layer AXI";
49 default:
50 return "Unknown";
51 }
52}
53
54static ssize_t realview_get_manf(struct device *dev,
55 struct device_attribute *attr,
56 char *buf)
57{
58 return sprintf(buf, "%02x\n", realview_coreid >> 24);
59}
60
61static struct device_attribute realview_manf_attr =
62 __ATTR(manufacturer, S_IRUGO, realview_get_manf, NULL);
63
64static ssize_t realview_get_board(struct device *dev,
65 struct device_attribute *attr,
66 char *buf)
67{
68 return sprintf(buf, "%s\n", realview_board_str(realview_coreid));
69}
70
71static struct device_attribute realview_board_attr =
72 __ATTR(board, S_IRUGO, realview_get_board, NULL);
73
74static ssize_t realview_get_arch(struct device *dev,
75 struct device_attribute *attr,
76 char *buf)
77{
78 return sprintf(buf, "%s\n", realview_arch_str(realview_coreid));
79}
80
81static struct device_attribute realview_arch_attr =
82 __ATTR(fpga, S_IRUGO, realview_get_arch, NULL);
83
84static ssize_t realview_get_build(struct device *dev,
85 struct device_attribute *attr,
86 char *buf)
87{
88 return sprintf(buf, "%02x\n", (realview_coreid & 0xFF));
89}
90
91static struct device_attribute realview_build_attr =
92 __ATTR(build, S_IRUGO, realview_get_build, NULL);
93
94static int realview_soc_probe(struct platform_device *pdev)
95{
96 static struct regmap *syscon_regmap;
97 struct soc_device *soc_dev;
98 struct soc_device_attribute *soc_dev_attr;
99 struct device_node *np = pdev->dev.of_node;
100 int ret;
101
102 syscon_regmap = syscon_regmap_lookup_by_phandle(np, "regmap");
103 if (IS_ERR(syscon_regmap))
104 return PTR_ERR(syscon_regmap);
105
106 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
107 if (!soc_dev_attr)
108 return -ENOMEM;
109
110 ret = of_property_read_string(np, "compatible",
111 &soc_dev_attr->soc_id);
112 if (ret)
113 return -EINVAL;
114
115 soc_dev_attr->machine = "RealView";
116 soc_dev_attr->family = "Versatile";
117 soc_dev = soc_device_register(soc_dev_attr);
118 if (IS_ERR(soc_dev)) {
119 kfree(soc_dev_attr);
120 return -ENODEV;
121 }
122 ret = regmap_read(syscon_regmap, REALVIEW_SYS_ID_OFFSET,
123 &realview_coreid);
124 if (ret)
125 return -ENODEV;
126
127 device_create_file(soc_device_to_device(soc_dev), &realview_manf_attr);
128 device_create_file(soc_device_to_device(soc_dev), &realview_board_attr);
129 device_create_file(soc_device_to_device(soc_dev), &realview_arch_attr);
130 device_create_file(soc_device_to_device(soc_dev), &realview_build_attr);
131
132 dev_info(&pdev->dev, "RealView Syscon Core ID: 0x%08x\n",
133 realview_coreid);
134 /* FIXME: add attributes for SoC to sysfs */
135 return 0;
136}
137
138static struct platform_driver realview_soc_driver = {
139 .probe = realview_soc_probe,
140 .driver = {
141 .name = "realview-soc",
142 .of_match_table = realview_soc_of_match,
143 },
144};
145builtin_platform_driver(realview_soc_driver);