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 * 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#define INTEGRATOR_HDR_ID_OFFSET 0x00
17
18static u32 integrator_coreid;
19
20static const struct of_device_id integrator_cm_match[] = {
21 { .compatible = "arm,core-module-integrator", },
22 { }
23};
24
25static const char *integrator_arch_str(u32 id)
26{
27 switch ((id >> 16) & 0xff) {
28 case 0x00:
29 return "ASB little-endian";
30 case 0x01:
31 return "AHB little-endian";
32 case 0x03:
33 return "AHB-Lite system bus, bi-endian";
34 case 0x04:
35 return "AHB";
36 case 0x08:
37 return "AHB system bus, ASB processor bus";
38 default:
39 return "Unknown";
40 }
41}
42
43static const char *integrator_fpga_str(u32 id)
44{
45 switch ((id >> 12) & 0xf) {
46 case 0x01:
47 return "XC4062";
48 case 0x02:
49 return "XC4085";
50 case 0x03:
51 return "XVC600";
52 case 0x04:
53 return "EPM7256AE (Altera PLD)";
54 default:
55 return "Unknown";
56 }
57}
58
59static ssize_t
60manufacturer_show(struct device *dev, struct device_attribute *attr, char *buf)
61{
62 return sprintf(buf, "%02x\n", integrator_coreid >> 24);
63}
64
65static DEVICE_ATTR_RO(manufacturer);
66
67static ssize_t
68arch_show(struct device *dev, struct device_attribute *attr, char *buf)
69{
70 return sprintf(buf, "%s\n", integrator_arch_str(integrator_coreid));
71}
72
73static DEVICE_ATTR_RO(arch);
74
75static ssize_t
76fpga_show(struct device *dev, struct device_attribute *attr, char *buf)
77{
78 return sprintf(buf, "%s\n", integrator_fpga_str(integrator_coreid));
79}
80
81static DEVICE_ATTR_RO(fpga);
82
83static ssize_t
84build_show(struct device *dev, struct device_attribute *attr, char *buf)
85{
86 return sprintf(buf, "%02x\n", (integrator_coreid >> 4) & 0xFF);
87}
88
89static DEVICE_ATTR_RO(build);
90
91static struct attribute *integrator_attrs[] = {
92 &dev_attr_manufacturer.attr,
93 &dev_attr_arch.attr,
94 &dev_attr_fpga.attr,
95 &dev_attr_build.attr,
96 NULL
97};
98
99ATTRIBUTE_GROUPS(integrator);
100
101static int __init integrator_soc_init(void)
102{
103 struct regmap *syscon_regmap;
104 struct soc_device *soc_dev;
105 struct soc_device_attribute *soc_dev_attr;
106 struct device_node *np;
107 struct device *dev;
108 u32 val;
109 int ret;
110
111 np = of_find_matching_node(NULL, integrator_cm_match);
112 if (!np)
113 return -ENODEV;
114
115 syscon_regmap = syscon_node_to_regmap(np);
116 of_node_put(np);
117 if (IS_ERR(syscon_regmap))
118 return PTR_ERR(syscon_regmap);
119
120 ret = regmap_read(syscon_regmap, INTEGRATOR_HDR_ID_OFFSET,
121 &val);
122 if (ret)
123 return -ENODEV;
124 integrator_coreid = val;
125
126 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
127 if (!soc_dev_attr)
128 return -ENOMEM;
129
130 soc_dev_attr->soc_id = "Integrator";
131 soc_dev_attr->machine = "Integrator";
132 soc_dev_attr->family = "Versatile";
133 soc_dev_attr->custom_attr_group = integrator_groups[0];
134 soc_dev = soc_device_register(soc_dev_attr);
135 if (IS_ERR(soc_dev)) {
136 kfree(soc_dev_attr);
137 return -ENODEV;
138 }
139 dev = soc_device_to_device(soc_dev);
140
141 dev_info(dev, "Detected ARM core module:\n");
142 dev_info(dev, " Manufacturer: %02x\n", (val >> 24));
143 dev_info(dev, " Architecture: %s\n", integrator_arch_str(val));
144 dev_info(dev, " FPGA: %s\n", integrator_fpga_str(val));
145 dev_info(dev, " Build: %02x\n", (val >> 4) & 0xFF);
146 dev_info(dev, " Rev: %c\n", ('A' + (val & 0x03)));
147
148 return 0;
149}
150device_initcall(integrator_soc_init);