mirror of
https://github.com/AsahiLinux/u-boot
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
96 lines
2.2 KiB
C
96 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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