soc-realview.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2014 Linaro Ltd.
*
* Author: Linus Walleij <linus.walleij@linaro.org>
*/
#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>
/* System ID in syscon */
#define REALVIEW_SYS_ID_OFFSET 0x00
static const struct of_device_id realview_soc_of_match[] = {
{ .compatible = "arm,realview-eb-soc", },
{ .compatible = "arm,realview-pb1176-soc", },
{ .compatible = "arm,realview-pb11mp-soc", },
{ .compatible = "arm,realview-pba8-soc", },
{ .compatible = "arm,realview-pbx-soc", },
{ }
};
static u32 realview_coreid;
static const char *realview_arch_str(u32 id)
{
switch ((id >> 8) & 0xf) {
case 0x04:
return "AHB";
case 0x05:
return "Multi-layer AXI";
default:
return "Unknown";
}
}
static ssize_t
manufacturer_show(struct device *dev, struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%02x\n", realview_coreid >> 24);
}
static DEVICE_ATTR_RO(manufacturer);
static ssize_t
board_show(struct device *dev, struct device_attribute *attr, char *buf)
{
return sprintf(buf, "HBI-%03x\n", ((realview_coreid >> 16) & 0xfff));
}
static DEVICE_ATTR_RO(board);
static ssize_t
fpga_show(struct device *dev, struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%s\n", realview_arch_str(realview_coreid));
}
static DEVICE_ATTR_RO(fpga);
static ssize_t
build_show(struct device *dev, struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%02x\n", (realview_coreid & 0xFF));
}
static DEVICE_ATTR_RO(build);
static struct attribute *realview_attrs[] = {
&dev_attr_manufacturer.attr,
&dev_attr_board.attr,
&dev_attr_fpga.attr,
&dev_attr_build.attr,
NULL
};
ATTRIBUTE_GROUPS(realview);
static int realview_soc_probe(struct platform_device *pdev)
{
struct regmap *syscon_regmap;
struct soc_device *soc_dev;
struct soc_device_attribute *soc_dev_attr;
struct device_node *np = pdev->dev.of_node;
int ret;
syscon_regmap = syscon_regmap_lookup_by_phandle(np, "regmap");
if (IS_ERR(syscon_regmap))
return PTR_ERR(syscon_regmap);
soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
if (!soc_dev_attr)
return -ENOMEM;
ret = of_property_read_string(np, "compatible",
&soc_dev_attr->soc_id);
if (ret)
return -EINVAL;
soc_dev_attr->machine = "RealView";
soc_dev_attr->family = "Versatile";
soc_dev_attr->custom_attr_group = realview_groups[0];
soc_dev = soc_device_register(soc_dev_attr);
if (IS_ERR(soc_dev)) {
kfree(soc_dev_attr);
return -ENODEV;
}
ret = regmap_read(syscon_regmap, REALVIEW_SYS_ID_OFFSET,
&realview_coreid);
if (ret)
return -ENODEV;
dev_info(&pdev->dev, "RealView Syscon Core ID: 0x%08x, HBI-%03x\n",
realview_coreid,
((realview_coreid >> 16) & 0xfff));
/* FIXME: add attributes for SoC to sysfs */
return 0;
}
static struct platform_driver realview_soc_driver = {
.probe = realview_soc_probe,
.driver = {
.name = "realview-soc",
.of_match_table = realview_soc_of_match,
},
};
builtin_platform_driver(realview_soc_driver);