mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-24 20:54:10 +08:00
9f467393e2
There is no need to have the 'struct regmap *syscon_regmap' variable static since new value always be assigned before use it. Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: YueHaibing <yuehaibing@huawei.com> Link: https://lore.kernel.org/r/20200715024701.28356-1-yuehaibing@huawei.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
150 lines
3.4 KiB
C
150 lines
3.4 KiB
C
// 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>
|
|
|
|
#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
|
|
manufacturer_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "%02x\n", integrator_coreid >> 24);
|
|
}
|
|
|
|
static DEVICE_ATTR_RO(manufacturer);
|
|
|
|
static ssize_t
|
|
arch_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "%s\n", integrator_arch_str(integrator_coreid));
|
|
}
|
|
|
|
static DEVICE_ATTR_RO(arch);
|
|
|
|
static ssize_t
|
|
fpga_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "%s\n", integrator_fpga_str(integrator_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", (integrator_coreid >> 4) & 0xFF);
|
|
}
|
|
|
|
static DEVICE_ATTR_RO(build);
|
|
|
|
static struct attribute *integrator_attrs[] = {
|
|
&dev_attr_manufacturer.attr,
|
|
&dev_attr_arch.attr,
|
|
&dev_attr_fpga.attr,
|
|
&dev_attr_build.attr,
|
|
NULL
|
|
};
|
|
|
|
ATTRIBUTE_GROUPS(integrator);
|
|
|
|
static int __init integrator_soc_init(void)
|
|
{
|
|
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_attr->custom_attr_group = integrator_groups[0];
|
|
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);
|
|
|
|
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);
|