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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2019 NXP.
*/
#include <linux/init.h>
#include <linux/io.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#define REV_B1 0x21
#define IMX8MQ_SW_INFO_B1 0x40
#define IMX8MQ_SW_MAGIC_B1 0xff0055aa
struct imx8_soc_data {
char *name;
u32 (*soc_revision)(void);
};
static u32 __init imx8mq_soc_revision(void)
{
struct device_node *np;
void __iomem *ocotp_base;
u32 magic;
u32 rev = 0;
np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq-ocotp");
if (!np)
goto out;
ocotp_base = of_iomap(np, 0);
WARN_ON(!ocotp_base);
magic = readl_relaxed(ocotp_base + IMX8MQ_SW_INFO_B1);
if (magic == IMX8MQ_SW_MAGIC_B1)
rev = REV_B1;
iounmap(ocotp_base);
out:
of_node_put(np);
return rev;
}
static const struct imx8_soc_data imx8mq_soc_data = {
.name = "i.MX8MQ",
.soc_revision = imx8mq_soc_revision,
};
static const struct of_device_id imx8_soc_match[] = {
{ .compatible = "fsl,imx8mq", .data = &imx8mq_soc_data, },
{ }
};
#define imx8_revision(soc_rev) \
soc_rev ? \
kasprintf(GFP_KERNEL, "%d.%d", (soc_rev >> 4) & 0xf, soc_rev & 0xf) : \
"unknown"
static int __init imx8_soc_init(void)
{
struct soc_device_attribute *soc_dev_attr;
struct soc_device *soc_dev;
struct device_node *root;
const struct of_device_id *id;
u32 soc_rev = 0;
const struct imx8_soc_data *data;
int ret;
soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
if (!soc_dev_attr)
return -ENODEV;
soc_dev_attr->family = "Freescale i.MX";
root = of_find_node_by_path("/");
ret = of_property_read_string(root, "model", &soc_dev_attr->machine);
if (ret)
goto free_soc;
id = of_match_node(imx8_soc_match, root);
if (!id)
goto free_soc;
of_node_put(root);
data = id->data;
if (data) {
soc_dev_attr->soc_id = data->name;
if (data->soc_revision)
soc_rev = data->soc_revision();
}
soc_dev_attr->revision = imx8_revision(soc_rev);
if (!soc_dev_attr->revision)
goto free_soc;
soc_dev = soc_device_register(soc_dev_attr);
if (IS_ERR(soc_dev))
goto free_rev;
return 0;
free_rev:
kfree(soc_dev_attr->revision);
free_soc:
kfree(soc_dev_attr);
of_node_put(root);
return -ENODEV;
}
device_initcall(imx8_soc_init);
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