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);