mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-25 04:23:46 +00:00
ae3d38f318
This driver allows the use of i2c eeprom device or partition as backing store for boot counter values with DM enabled. Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (C) Copyright 2019 Collabora
|
|
* (C) Copyright 2019 GE
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <bootcount.h>
|
|
#include <dm.h>
|
|
#include <i2c_eeprom.h>
|
|
|
|
static const u8 bootcount_magic = 0xbc;
|
|
|
|
struct bootcount_i2c_eeprom_priv {
|
|
struct udevice *i2c_eeprom;
|
|
u32 offset;
|
|
};
|
|
|
|
static int bootcount_i2c_eeprom_set(struct udevice *dev, const u32 a)
|
|
{
|
|
struct bootcount_i2c_eeprom_priv *priv = dev_get_priv(dev);
|
|
const u16 val = bootcount_magic << 8 | (a & 0xff);
|
|
|
|
if (i2c_eeprom_write(priv->i2c_eeprom, priv->offset,
|
|
(uint8_t *)&val, 2) < 0) {
|
|
debug("%s: write failed\n", __func__);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bootcount_i2c_eeprom_get(struct udevice *dev, u32 *a)
|
|
{
|
|
struct bootcount_i2c_eeprom_priv *priv = dev_get_priv(dev);
|
|
u16 val;
|
|
|
|
if (i2c_eeprom_read(priv->i2c_eeprom, priv->offset,
|
|
(uint8_t *)&val, 2) < 0) {
|
|
debug("%s: read failed\n", __func__);
|
|
return -EIO;
|
|
}
|
|
|
|
if (val >> 8 == bootcount_magic) {
|
|
*a = val & 0xff;
|
|
return 0;
|
|
}
|
|
|
|
debug("%s: bootcount magic does not match on %04x\n", __func__, val);
|
|
return -EIO;
|
|
}
|
|
|
|
static int bootcount_i2c_eeprom_probe(struct udevice *dev)
|
|
{
|
|
struct ofnode_phandle_args phandle_args;
|
|
struct bootcount_i2c_eeprom_priv *priv = dev_get_priv(dev);
|
|
struct udevice *i2c_eeprom;
|
|
|
|
if (dev_read_phandle_with_args(dev, "i2c-eeprom", NULL, 0, 0,
|
|
&phandle_args)) {
|
|
debug("%s: i2c-eeprom backing device not specified\n",
|
|
dev->name);
|
|
return -ENOENT;
|
|
}
|
|
|
|
if (uclass_get_device_by_ofnode(UCLASS_I2C_EEPROM, phandle_args.node,
|
|
&i2c_eeprom)) {
|
|
debug("%s: could not get backing device\n", dev->name);
|
|
return -ENODEV;
|
|
}
|
|
|
|
priv->i2c_eeprom = i2c_eeprom;
|
|
priv->offset = dev_read_u32_default(dev, "offset", 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct bootcount_ops bootcount_i2c_eeprom_ops = {
|
|
.get = bootcount_i2c_eeprom_get,
|
|
.set = bootcount_i2c_eeprom_set,
|
|
};
|
|
|
|
static const struct udevice_id bootcount_i2c_eeprom_ids[] = {
|
|
{ .compatible = "u-boot,bootcount-i2c-eeprom" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(bootcount_spi_flash) = {
|
|
.name = "bootcount-i2c-eeprom",
|
|
.id = UCLASS_BOOTCOUNT,
|
|
.priv_auto_alloc_size = sizeof(struct bootcount_i2c_eeprom_priv),
|
|
.probe = bootcount_i2c_eeprom_probe,
|
|
.of_match = bootcount_i2c_eeprom_ids,
|
|
.ops = &bootcount_i2c_eeprom_ops,
|
|
};
|