1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2014 Linaro Ltd.
5 * Author: Linus Walleij <linus.walleij@linaro.org>
7 #include <linux/init.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>
16 #define INTEGRATOR_HDR_ID_OFFSET 0x00
18 static u32 integrator_coreid;
20 static const struct of_device_id integrator_cm_match[] = {
21 { .compatible = "arm,core-module-integrator", },
25 static const char *integrator_arch_str(u32 id)
27 switch ((id >> 16) & 0xff) {
29 return "ASB little-endian";
31 return "AHB little-endian";
33 return "AHB-Lite system bus, bi-endian";
37 return "AHB system bus, ASB processor bus";
43 static const char *integrator_fpga_str(u32 id)
45 switch ((id >> 12) & 0xf) {
53 return "EPM7256AE (Altera PLD)";
60 manufacturer_show(struct device *dev, struct device_attribute *attr, char *buf)
62 return sprintf(buf, "%02x\n", integrator_coreid >> 24);
65 static DEVICE_ATTR_RO(manufacturer);
68 arch_show(struct device *dev, struct device_attribute *attr, char *buf)
70 return sprintf(buf, "%s\n", integrator_arch_str(integrator_coreid));
73 static DEVICE_ATTR_RO(arch);
76 fpga_show(struct device *dev, struct device_attribute *attr, char *buf)
78 return sprintf(buf, "%s\n", integrator_fpga_str(integrator_coreid));
81 static DEVICE_ATTR_RO(fpga);
84 build_show(struct device *dev, struct device_attribute *attr, char *buf)
86 return sprintf(buf, "%02x\n", (integrator_coreid >> 4) & 0xFF);
89 static DEVICE_ATTR_RO(build);
91 static struct attribute *integrator_attrs[] = {
92 &dev_attr_manufacturer.attr,
99 ATTRIBUTE_GROUPS(integrator);
101 static int __init integrator_soc_init(void)
103 struct regmap *syscon_regmap;
104 struct soc_device *soc_dev;
105 struct soc_device_attribute *soc_dev_attr;
106 struct device_node *np;
111 np = of_find_matching_node(NULL, integrator_cm_match);
115 syscon_regmap = syscon_node_to_regmap(np);
116 if (IS_ERR(syscon_regmap))
117 return PTR_ERR(syscon_regmap);
119 ret = regmap_read(syscon_regmap, INTEGRATOR_HDR_ID_OFFSET,
123 integrator_coreid = val;
125 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
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)) {
138 dev = soc_device_to_device(soc_dev);
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)));
149 device_initcall(integrator_soc_init);