1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (C) 2014 Linaro Ltd. |
4 | * |
5 | * Author: Linus Walleij <linus.walleij@linaro.org> |
6 | */ |
7 | #include <linux/init.h> |
8 | #include <linux/io.h> |
9 | #include <linux/slab.h> |
10 | #include <linux/sys_soc.h> |
11 | #include <linux/platform_device.h> |
12 | #include <linux/mfd/syscon.h> |
13 | #include <linux/regmap.h> |
14 | #include <linux/of.h> |
15 | |
16 | /* System ID in syscon */ |
17 | #define REALVIEW_SYS_ID_OFFSET 0x00 |
18 | |
19 | static const struct of_device_id realview_soc_of_match[] = { |
20 | { .compatible = "arm,realview-eb-soc" , }, |
21 | { .compatible = "arm,realview-pb1176-soc" , }, |
22 | { .compatible = "arm,realview-pb11mp-soc" , }, |
23 | { .compatible = "arm,realview-pba8-soc" , }, |
24 | { .compatible = "arm,realview-pbx-soc" , }, |
25 | { } |
26 | }; |
27 | |
28 | static u32 realview_coreid; |
29 | |
30 | static const char *realview_arch_str(u32 id) |
31 | { |
32 | switch ((id >> 8) & 0xf) { |
33 | case 0x04: |
34 | return "AHB" ; |
35 | case 0x05: |
36 | return "Multi-layer AXI" ; |
37 | default: |
38 | return "Unknown" ; |
39 | } |
40 | } |
41 | |
42 | static ssize_t |
43 | manufacturer_show(struct device *dev, struct device_attribute *attr, char *buf) |
44 | { |
45 | return sprintf(buf, fmt: "%02x\n" , realview_coreid >> 24); |
46 | } |
47 | |
48 | static DEVICE_ATTR_RO(manufacturer); |
49 | |
50 | static ssize_t |
51 | board_show(struct device *dev, struct device_attribute *attr, char *buf) |
52 | { |
53 | return sprintf(buf, fmt: "HBI-%03x\n" , ((realview_coreid >> 16) & 0xfff)); |
54 | } |
55 | |
56 | static DEVICE_ATTR_RO(board); |
57 | |
58 | static ssize_t |
59 | fpga_show(struct device *dev, struct device_attribute *attr, char *buf) |
60 | { |
61 | return sprintf(buf, fmt: "%s\n" , realview_arch_str(id: realview_coreid)); |
62 | } |
63 | |
64 | static DEVICE_ATTR_RO(fpga); |
65 | |
66 | static ssize_t |
67 | build_show(struct device *dev, struct device_attribute *attr, char *buf) |
68 | { |
69 | return sprintf(buf, fmt: "%02x\n" , (realview_coreid & 0xFF)); |
70 | } |
71 | |
72 | static DEVICE_ATTR_RO(build); |
73 | |
74 | static struct attribute *realview_attrs[] = { |
75 | &dev_attr_manufacturer.attr, |
76 | &dev_attr_board.attr, |
77 | &dev_attr_fpga.attr, |
78 | &dev_attr_build.attr, |
79 | NULL |
80 | }; |
81 | |
82 | ATTRIBUTE_GROUPS(realview); |
83 | |
84 | static int realview_soc_probe(struct platform_device *pdev) |
85 | { |
86 | struct regmap *syscon_regmap; |
87 | struct soc_device *soc_dev; |
88 | struct soc_device_attribute *soc_dev_attr; |
89 | struct device_node *np = pdev->dev.of_node; |
90 | int ret; |
91 | |
92 | syscon_regmap = syscon_regmap_lookup_by_phandle(np, property: "regmap" ); |
93 | if (IS_ERR(ptr: syscon_regmap)) |
94 | return PTR_ERR(ptr: syscon_regmap); |
95 | |
96 | soc_dev_attr = kzalloc(size: sizeof(*soc_dev_attr), GFP_KERNEL); |
97 | if (!soc_dev_attr) |
98 | return -ENOMEM; |
99 | |
100 | ret = of_property_read_string(np, propname: "compatible" , |
101 | out_string: &soc_dev_attr->soc_id); |
102 | if (ret) |
103 | return -EINVAL; |
104 | |
105 | soc_dev_attr->machine = "RealView" ; |
106 | soc_dev_attr->family = "Versatile" ; |
107 | soc_dev_attr->custom_attr_group = realview_groups[0]; |
108 | soc_dev = soc_device_register(soc_plat_dev_attr: soc_dev_attr); |
109 | if (IS_ERR(ptr: soc_dev)) { |
110 | kfree(objp: soc_dev_attr); |
111 | return -ENODEV; |
112 | } |
113 | ret = regmap_read(map: syscon_regmap, REALVIEW_SYS_ID_OFFSET, |
114 | val: &realview_coreid); |
115 | if (ret) |
116 | return -ENODEV; |
117 | |
118 | dev_info(&pdev->dev, "RealView Syscon Core ID: 0x%08x, HBI-%03x\n" , |
119 | realview_coreid, |
120 | ((realview_coreid >> 16) & 0xfff)); |
121 | /* FIXME: add attributes for SoC to sysfs */ |
122 | return 0; |
123 | } |
124 | |
125 | static struct platform_driver realview_soc_driver = { |
126 | .probe = realview_soc_probe, |
127 | .driver = { |
128 | .name = "realview-soc" , |
129 | .of_match_table = realview_soc_of_match, |
130 | }, |
131 | }; |
132 | builtin_platform_driver(realview_soc_driver); |
133 | |