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firmware: meson_sm: Add serial number sysfs entry 

The Amlogic Meson SoC Secure Monitor implements a call to retrieve an unique
SoC ID starting from the GX Family and all new families.

The serial number is simply exposed as a sysfs entry under the firmware
sysfs directory.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
hifive-unleashed-5.1
Neil Armstrong 2018-07-26 15:59:16 +02:00 committed by Kevin Hilman
parent 5b394b2ddf
commit 0789724f86
2 changed files with 57 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
drivers/firmware/meson/meson_sm.c
View File

@ -24,6 +24,7 @@
#include <linux/printk.h>
#include <linux/types.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/firmware/meson/meson_sm.h>
@ -48,6 +49,7 @@ struct meson_sm_chip gxbb_chip = {
CMD(SM_EFUSE_READ, 0x82000030),
CMD(SM_EFUSE_WRITE, 0x82000031),
CMD(SM_EFUSE_USER_MAX, 0x82000033),
CMD(SM_GET_CHIP_ID, 0x82000044),
{ /* sentinel */ },
},
};
@ -214,6 +216,57 @@ int meson_sm_call_write(void *buffer, unsigned int size, unsigned int cmd_index,
}
EXPORT_SYMBOL(meson_sm_call_write);
#define SM_CHIP_ID_LENGTH 119
#define SM_CHIP_ID_OFFSET 4
#define SM_CHIP_ID_SIZE 12
static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
uint8_t *id_buf;
int ret;
id_buf = kmalloc(SM_CHIP_ID_LENGTH, GFP_KERNEL);
if (!id_buf)
return -ENOMEM;
ret = meson_sm_call_read(id_buf, SM_CHIP_ID_LENGTH, SM_GET_CHIP_ID,
0, 0, 0, 0, 0);
if (ret < 0) {
kfree(id_buf);
return ret;
}
ret = sprintf(buf, "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n",
id_buf[SM_CHIP_ID_OFFSET + 0],
id_buf[SM_CHIP_ID_OFFSET + 1],
id_buf[SM_CHIP_ID_OFFSET + 2],
id_buf[SM_CHIP_ID_OFFSET + 3],
id_buf[SM_CHIP_ID_OFFSET + 4],
id_buf[SM_CHIP_ID_OFFSET + 5],
id_buf[SM_CHIP_ID_OFFSET + 6],
id_buf[SM_CHIP_ID_OFFSET + 7],
id_buf[SM_CHIP_ID_OFFSET + 8],
id_buf[SM_CHIP_ID_OFFSET + 9],
id_buf[SM_CHIP_ID_OFFSET + 10],
id_buf[SM_CHIP_ID_OFFSET + 11]);
kfree(id_buf);
return ret;
}
static DEVICE_ATTR_RO(serial);
static struct attribute *meson_sm_sysfs_attributes[] = {
&dev_attr_serial.attr,
NULL,
};
static const struct attribute_group meson_sm_sysfs_attr_group = {
.attrs = meson_sm_sysfs_attributes,
};
static const struct of_device_id meson_sm_ids[] = {
{ .compatible = "amlogic,meson-gxbb-sm", .data = &gxbb_chip },
{ /* sentinel */ },
@ -242,6 +295,9 @@ static int __init meson_sm_probe(struct platform_device *pdev)
fw.chip = chip;
pr_info("secure-monitor enabled\n");
if (sysfs_create_group(&pdev->dev.kobj, &meson_sm_sysfs_attr_group))
goto out_in_base;
return 0;
out_in_base:

1
include/linux/firmware/meson/meson_sm.h
View File

@ -17,6 +17,7 @@ enum {
SM_EFUSE_READ,
SM_EFUSE_WRITE,
SM_EFUSE_USER_MAX,
SM_GET_CHIP_ID,
};
struct meson_sm_firmware;