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- // 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>
- #include <log.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 = sizeof(struct bootcount_i2c_eeprom_priv),
- .probe = bootcount_i2c_eeprom_probe,
- .of_match = bootcount_i2c_eeprom_ids,
- .ops = &bootcount_i2c_eeprom_ops,
- };
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