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a2974c9c LW |
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 | ||
23 | static 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", }, | |
157a1b17 | 29 | { } |
a2974c9c LW |
30 | }; |
31 | ||
32 | static u32 realview_coreid; | |
33 | ||
a2974c9c LW |
34 | static const char *realview_arch_str(u32 id) |
35 | { | |
36 | switch ((id >> 8) & 0xf) { | |
5d87f7a3 LW |
37 | case 0x04: |
38 | return "AHB"; | |
a2974c9c LW |
39 | case 0x05: |
40 | return "Multi-layer AXI"; | |
41 | default: | |
42 | return "Unknown"; | |
43 | } | |
44 | } | |
45 | ||
46 | static ssize_t realview_get_manf(struct device *dev, | |
47 | struct device_attribute *attr, | |
48 | char *buf) | |
49 | { | |
50 | return sprintf(buf, "%02x\n", realview_coreid >> 24); | |
51 | } | |
52 | ||
53 | static struct device_attribute realview_manf_attr = | |
54 | __ATTR(manufacturer, S_IRUGO, realview_get_manf, NULL); | |
55 | ||
56 | static ssize_t realview_get_board(struct device *dev, | |
57 | struct device_attribute *attr, | |
58 | char *buf) | |
59 | { | |
fccc2b36 | 60 | return sprintf(buf, "HBI-%03x\n", ((realview_coreid >> 16) & 0xfff)); |
a2974c9c LW |
61 | } |
62 | ||
63 | static struct device_attribute realview_board_attr = | |
64 | __ATTR(board, S_IRUGO, realview_get_board, NULL); | |
65 | ||
66 | static ssize_t realview_get_arch(struct device *dev, | |
67 | struct device_attribute *attr, | |
68 | char *buf) | |
69 | { | |
70 | return sprintf(buf, "%s\n", realview_arch_str(realview_coreid)); | |
71 | } | |
72 | ||
73 | static struct device_attribute realview_arch_attr = | |
74 | __ATTR(fpga, S_IRUGO, realview_get_arch, NULL); | |
75 | ||
76 | static ssize_t realview_get_build(struct device *dev, | |
77 | struct device_attribute *attr, | |
78 | char *buf) | |
79 | { | |
80 | return sprintf(buf, "%02x\n", (realview_coreid & 0xFF)); | |
81 | } | |
82 | ||
83 | static struct device_attribute realview_build_attr = | |
84 | __ATTR(build, S_IRUGO, realview_get_build, NULL); | |
85 | ||
86 | static int realview_soc_probe(struct platform_device *pdev) | |
87 | { | |
db86ab06 | 88 | struct regmap *syscon_regmap; |
a2974c9c LW |
89 | struct soc_device *soc_dev; |
90 | struct soc_device_attribute *soc_dev_attr; | |
91 | struct device_node *np = pdev->dev.of_node; | |
92 | int ret; | |
93 | ||
94 | syscon_regmap = syscon_regmap_lookup_by_phandle(np, "regmap"); | |
95 | if (IS_ERR(syscon_regmap)) | |
96 | return PTR_ERR(syscon_regmap); | |
97 | ||
98 | soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); | |
99 | if (!soc_dev_attr) | |
100 | return -ENOMEM; | |
101 | ||
102 | ret = of_property_read_string(np, "compatible", | |
103 | &soc_dev_attr->soc_id); | |
104 | if (ret) | |
105 | return -EINVAL; | |
106 | ||
107 | soc_dev_attr->machine = "RealView"; | |
108 | soc_dev_attr->family = "Versatile"; | |
109 | soc_dev = soc_device_register(soc_dev_attr); | |
110 | if (IS_ERR(soc_dev)) { | |
111 | kfree(soc_dev_attr); | |
112 | return -ENODEV; | |
113 | } | |
114 | ret = regmap_read(syscon_regmap, REALVIEW_SYS_ID_OFFSET, | |
115 | &realview_coreid); | |
116 | if (ret) | |
117 | return -ENODEV; | |
118 | ||
119 | device_create_file(soc_device_to_device(soc_dev), &realview_manf_attr); | |
120 | device_create_file(soc_device_to_device(soc_dev), &realview_board_attr); | |
121 | device_create_file(soc_device_to_device(soc_dev), &realview_arch_attr); | |
122 | device_create_file(soc_device_to_device(soc_dev), &realview_build_attr); | |
123 | ||
fccc2b36 LW |
124 | dev_info(&pdev->dev, "RealView Syscon Core ID: 0x%08x, HBI-%03x\n", |
125 | realview_coreid, | |
126 | ((realview_coreid >> 16) & 0xfff)); | |
a2974c9c LW |
127 | /* FIXME: add attributes for SoC to sysfs */ |
128 | return 0; | |
129 | } | |
130 | ||
131 | static struct platform_driver realview_soc_driver = { | |
132 | .probe = realview_soc_probe, | |
133 | .driver = { | |
134 | .name = "realview-soc", | |
135 | .of_match_table = realview_soc_of_match, | |
136 | }, | |
137 | }; | |
0159ae95 | 138 | builtin_platform_driver(realview_soc_driver); |