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 
18 static u32 integrator_coreid;
19 
20 static const struct of_device_id integrator_cm_match[] = {
21 	{ .compatible = "arm,core-module-integrator", },
22 	{ }
23 };
24 
25 static 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 
43 static 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 
59 static ssize_t integrator_get_manf(struct device *dev,
60 			      struct device_attribute *attr,
61 			      char *buf)
62 {
63 	return sprintf(buf, "%02x\n", integrator_coreid >> 24);
64 }
65 
66 static struct device_attribute integrator_manf_attr =
67 	__ATTR(manufacturer,  S_IRUGO, integrator_get_manf,  NULL);
68 
69 static ssize_t integrator_get_arch(struct device *dev,
70 			      struct device_attribute *attr,
71 			      char *buf)
72 {
73 	return sprintf(buf, "%s\n", integrator_arch_str(integrator_coreid));
74 }
75 
76 static struct device_attribute integrator_arch_attr =
77 	__ATTR(arch,  S_IRUGO, integrator_get_arch,  NULL);
78 
79 static ssize_t integrator_get_fpga(struct device *dev,
80 			      struct device_attribute *attr,
81 			      char *buf)
82 {
83 	return sprintf(buf, "%s\n", integrator_fpga_str(integrator_coreid));
84 }
85 
86 static struct device_attribute integrator_fpga_attr =
87 	__ATTR(fpga,  S_IRUGO, integrator_get_fpga,  NULL);
88 
89 static ssize_t integrator_get_build(struct device *dev,
90 			       struct device_attribute *attr,
91 			       char *buf)
92 {
93 	return sprintf(buf, "%02x\n", (integrator_coreid >> 4) & 0xFF);
94 }
95 
96 static struct device_attribute integrator_build_attr =
97 	__ATTR(build,  S_IRUGO, integrator_get_build,  NULL);
98 
99 static int __init integrator_soc_init(void)
100 {
101 	static struct regmap *syscon_regmap;
102 	struct soc_device *soc_dev;
103 	struct soc_device_attribute *soc_dev_attr;
104 	struct device_node *np;
105 	struct device *dev;
106 	u32 val;
107 	int ret;
108 
109 	np = of_find_matching_node(NULL, integrator_cm_match);
110 	if (!np)
111 		return -ENODEV;
112 
113 	syscon_regmap = syscon_node_to_regmap(np);
114 	if (IS_ERR(syscon_regmap))
115 		return PTR_ERR(syscon_regmap);
116 
117 	ret = regmap_read(syscon_regmap, INTEGRATOR_HDR_ID_OFFSET,
118 			  &val);
119 	if (ret)
120 		return -ENODEV;
121 	integrator_coreid = val;
122 
123 	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
124 	if (!soc_dev_attr)
125 		return -ENOMEM;
126 
127 	soc_dev_attr->soc_id = "Integrator";
128 	soc_dev_attr->machine = "Integrator";
129 	soc_dev_attr->family = "Versatile";
130 	soc_dev = soc_device_register(soc_dev_attr);
131 	if (IS_ERR(soc_dev)) {
132 		kfree(soc_dev_attr);
133 		return -ENODEV;
134 	}
135 	dev = soc_device_to_device(soc_dev);
136 
137 	device_create_file(dev, &integrator_manf_attr);
138 	device_create_file(dev, &integrator_arch_attr);
139 	device_create_file(dev, &integrator_fpga_attr);
140 	device_create_file(dev, &integrator_build_attr);
141 
142 	dev_info(dev, "Detected ARM core module:\n");
143 	dev_info(dev, "    Manufacturer: %02x\n", (val >> 24));
144 	dev_info(dev, "    Architecture: %s\n", integrator_arch_str(val));
145 	dev_info(dev, "    FPGA: %s\n", integrator_fpga_str(val));
146 	dev_info(dev, "    Build: %02x\n", (val >> 4) & 0xFF);
147 	dev_info(dev, "    Rev: %c\n", ('A' + (val & 0x03)));
148 
149 	return 0;
150 }
151 device_initcall(integrator_soc_init);
152