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@@ -0,0 +1,95 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * (C) Copyright 2019 Collabora
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+ * (C) Copyright 2019 GE
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+ */
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+
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+#include <common.h>
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+#include <bootcount.h>
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+#include <dm.h>
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+#include <i2c_eeprom.h>
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+
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+static const u8 bootcount_magic = 0xbc;
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+
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+struct bootcount_i2c_eeprom_priv {
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+ struct udevice *i2c_eeprom;
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+ u32 offset;
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+};
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+
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+static int bootcount_i2c_eeprom_set(struct udevice *dev, const u32 a)
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+{
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+ struct bootcount_i2c_eeprom_priv *priv = dev_get_priv(dev);
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+ const u16 val = bootcount_magic << 8 | (a & 0xff);
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+
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+ if (i2c_eeprom_write(priv->i2c_eeprom, priv->offset,
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+ (uint8_t *)&val, 2) < 0) {
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+ debug("%s: write failed\n", __func__);
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+ return -EIO;
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+ }
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+
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+ return 0;
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+}
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+
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+static int bootcount_i2c_eeprom_get(struct udevice *dev, u32 *a)
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+{
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+ struct bootcount_i2c_eeprom_priv *priv = dev_get_priv(dev);
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+ u16 val;
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+
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+ if (i2c_eeprom_read(priv->i2c_eeprom, priv->offset,
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+ (uint8_t *)&val, 2) < 0) {
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+ debug("%s: read failed\n", __func__);
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+ return -EIO;
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+ }
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+
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+ if (val >> 8 == bootcount_magic) {
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+ *a = val & 0xff;
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+ return 0;
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+ }
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+
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+ debug("%s: bootcount magic does not match on %04x\n", __func__, val);
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+ return -EIO;
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+}
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+
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+static int bootcount_i2c_eeprom_probe(struct udevice *dev)
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+{
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+ struct ofnode_phandle_args phandle_args;
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+ struct bootcount_i2c_eeprom_priv *priv = dev_get_priv(dev);
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+ struct udevice *i2c_eeprom;
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+
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+ if (dev_read_phandle_with_args(dev, "i2c-eeprom", NULL, 0, 0,
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+ &phandle_args)) {
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+ debug("%s: i2c-eeprom backing device not specified\n",
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+ dev->name);
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+ return -ENOENT;
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+ }
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+
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+ if (uclass_get_device_by_ofnode(UCLASS_I2C_EEPROM, phandle_args.node,
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+ &i2c_eeprom)) {
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+ debug("%s: could not get backing device\n", dev->name);
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+ return -ENODEV;
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+ }
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+
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+ priv->i2c_eeprom = i2c_eeprom;
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+ priv->offset = dev_read_u32_default(dev, "offset", 0);
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+
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+ return 0;
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+}
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+
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+static const struct bootcount_ops bootcount_i2c_eeprom_ops = {
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+ .get = bootcount_i2c_eeprom_get,
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+ .set = bootcount_i2c_eeprom_set,
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+};
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+
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+static const struct udevice_id bootcount_i2c_eeprom_ids[] = {
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+ { .compatible = "u-boot,bootcount-i2c-eeprom" },
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+ { }
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+};
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+
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+U_BOOT_DRIVER(bootcount_spi_flash) = {
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+ .name = "bootcount-i2c-eeprom",
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+ .id = UCLASS_BOOTCOUNT,
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+ .priv_auto_alloc_size = sizeof(struct bootcount_i2c_eeprom_priv),
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+ .probe = bootcount_i2c_eeprom_probe,
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+ .of_match = bootcount_i2c_eeprom_ids,
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+ .ops = &bootcount_i2c_eeprom_ops,
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+};
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