soc-integrator.c
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/*
* Copyright (C) 2014 Linaro Ltd.
*
* Author: Linus Walleij <linus.walleij@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2, as
* published by the Free Software Foundation.
*
*/
#include <linux/init.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
#include <linux/platform_device.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <linux/of.h>
#define INTEGRATOR_HDR_ID_OFFSET 0x00
static u32 integrator_coreid;
static const struct of_device_id integrator_cm_match[] = {
{ .compatible = "arm,core-module-integrator", },
{ }
};
static const char *integrator_arch_str(u32 id)
{
switch ((id >> 16) & 0xff) {
case 0x00:
return "ASB little-endian";
case 0x01:
return "AHB little-endian";
case 0x03:
return "AHB-Lite system bus, bi-endian";
case 0x04:
return "AHB";
case 0x08:
return "AHB system bus, ASB processor bus";
default:
return "Unknown";
}
}
static const char *integrator_fpga_str(u32 id)
{
switch ((id >> 12) & 0xf) {
case 0x01:
return "XC4062";
case 0x02:
return "XC4085";
case 0x03:
return "XVC600";
case 0x04:
return "EPM7256AE (Altera PLD)";
default:
return "Unknown";
}
}
static ssize_t integrator_get_manf(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%02x\n", integrator_coreid >> 24);
}
static struct device_attribute integrator_manf_attr =
__ATTR(manufacturer, S_IRUGO, integrator_get_manf, NULL);
static ssize_t integrator_get_arch(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%s\n", integrator_arch_str(integrator_coreid));
}
static struct device_attribute integrator_arch_attr =
__ATTR(arch, S_IRUGO, integrator_get_arch, NULL);
static ssize_t integrator_get_fpga(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%s\n", integrator_fpga_str(integrator_coreid));
}
static struct device_attribute integrator_fpga_attr =
__ATTR(fpga, S_IRUGO, integrator_get_fpga, NULL);
static ssize_t integrator_get_build(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%02x\n", (integrator_coreid >> 4) & 0xFF);
}
static struct device_attribute integrator_build_attr =
__ATTR(build, S_IRUGO, integrator_get_build, NULL);
static int __init integrator_soc_init(void)
{
static struct regmap *syscon_regmap;
struct soc_device *soc_dev;
struct soc_device_attribute *soc_dev_attr;
struct device_node *np;
struct device *dev;
u32 val;
int ret;
np = of_find_matching_node(NULL, integrator_cm_match);
if (!np)
return -ENODEV;
syscon_regmap = syscon_node_to_regmap(np);
if (IS_ERR(syscon_regmap))
return PTR_ERR(syscon_regmap);
ret = regmap_read(syscon_regmap, INTEGRATOR_HDR_ID_OFFSET,
&val);
if (ret)
return -ENODEV;
integrator_coreid = val;
soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
if (!soc_dev_attr)
return -ENOMEM;
soc_dev_attr->soc_id = "Integrator";
soc_dev_attr->machine = "Integrator";
soc_dev_attr->family = "Versatile";
soc_dev = soc_device_register(soc_dev_attr);
if (IS_ERR(soc_dev)) {
kfree(soc_dev_attr);
return -ENODEV;
}
dev = soc_device_to_device(soc_dev);
device_create_file(dev, &integrator_manf_attr);
device_create_file(dev, &integrator_arch_attr);
device_create_file(dev, &integrator_fpga_attr);
device_create_file(dev, &integrator_build_attr);
dev_info(dev, "Detected ARM core module:\n");
dev_info(dev, " Manufacturer: %02x\n", (val >> 24));
dev_info(dev, " Architecture: %s\n", integrator_arch_str(val));
dev_info(dev, " FPGA: %s\n", integrator_fpga_str(val));
dev_info(dev, " Build: %02x\n", (val >> 4) & 0xFF);
dev_info(dev, " Rev: %c\n", ('A' + (val & 0x03)));
return 0;
}
device_initcall(integrator_soc_init);