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	if (IS_ERR(syscon_regmap))
117		return PTR_ERR(syscon_regmap);
118
119	ret = regmap_read(syscon_regmap, INTEGRATOR_HDR_ID_OFFSET,
120			  &val);
121	if (ret)
122		return -ENODEV;
123	integrator_coreid = val;
124
125	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
126	if (!soc_dev_attr)
127		return -ENOMEM;
128
129	soc_dev_attr->soc_id = "Integrator";
130	soc_dev_attr->machine = "Integrator";
131	soc_dev_attr->family = "Versatile";
132	soc_dev_attr->custom_attr_group = integrator_groups[0];
133	soc_dev = soc_device_register(soc_dev_attr);
134	if (IS_ERR(soc_dev)) {
135		kfree(soc_dev_attr);
136		return -ENODEV;
137	}
138	dev = soc_device_to_device(soc_dev);
139
140	dev_info(dev, "Detected ARM core module:\n");
141	dev_info(dev, "    Manufacturer: %02x\n", (val >> 24));
142	dev_info(dev, "    Architecture: %s\n", integrator_arch_str(val));
143	dev_info(dev, "    FPGA: %s\n", integrator_fpga_str(val));
144	dev_info(dev, "    Build: %02x\n", (val >> 4) & 0xFF);
145	dev_info(dev, "    Rev: %c\n", ('A' + (val & 0x03)));
146
147	return 0;
148}
149device_initcall(integrator_soc_init);
150