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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 | ||
34 | static 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 | ||
44 | static 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 | ||
54 | static 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 | ||
61 | static struct device_attribute realview_manf_attr = | |
62 | __ATTR(manufacturer, S_IRUGO, realview_get_manf, NULL); | |
63 | ||
64 | static 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 | ||
71 | static struct device_attribute realview_board_attr = | |
72 | __ATTR(board, S_IRUGO, realview_get_board, NULL); | |
73 | ||
74 | static 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 | ||
81 | static struct device_attribute realview_arch_attr = | |
82 | __ATTR(fpga, S_IRUGO, realview_get_arch, NULL); | |
83 | ||
84 | static 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 | ||
91 | static struct device_attribute realview_build_attr = | |
92 | __ATTR(build, S_IRUGO, realview_get_build, NULL); | |
93 | ||
94 | static 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 | ||
138 | static 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 | }; | |
145 | module_platform_driver(realview_soc_driver); |