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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
// 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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#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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#include <log.h>
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static const u8 bootcount_magic = 0xbc;
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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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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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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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return 0;
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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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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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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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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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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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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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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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priv->i2c_eeprom = i2c_eeprom;
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priv->offset = dev_read_u32_default(dev, "offset", 0);
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return 0;
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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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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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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 = 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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