mirror of
https://github.com/smaeul/u-boot.git
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03de305ec4
As part of bringing the master branch back in to next, we need to allow for all of these changes to exist here. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
125 lines
2.9 KiB
C
125 lines
2.9 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 <bootcount.h>
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#include <dm.h>
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#include <spi_flash.h>
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static const u8 bootcount_magic = 0xbc;
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struct bootcount_spi_flash_priv {
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struct udevice *spi_flash;
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u32 offset;
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};
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static int bootcount_spi_flash_update(struct udevice *dev, u32 offset, u32 len, const void *buf)
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{
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struct spi_flash *flash = dev_get_uclass_priv(dev);
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u32 sector_size = flash->sector_size;
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u32 sector_offset = offset % sector_size;
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u32 sector = offset - sector_offset;
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int err = 0;
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/* code only supports updating a single sector */
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if (sector_offset + len > sector_size)
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return -ENOSYS;
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u8 *buffer = malloc(sector_size);
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if (!buffer)
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return -ENOMEM;
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err = spi_flash_read_dm(dev, sector, sector_size, buffer);
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if (err < 0)
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goto out;
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memcpy(buffer + sector_offset, buf, len);
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err = spi_flash_erase_dm(dev, sector, sector_size);
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if (err < 0)
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goto out;
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err = spi_flash_write_dm(dev, sector, sector_size, buffer);
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if (err < 0)
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goto out;
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out:
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free(buffer);
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return err;
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}
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static int bootcount_spi_flash_set(struct udevice *dev, const u32 a)
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{
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struct bootcount_spi_flash_priv *priv = dev_get_priv(dev);
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const u16 val = bootcount_magic << 8 | (a & 0xff);
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if (bootcount_spi_flash_update(priv->spi_flash, priv->offset, 2, &val) < 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_spi_flash_get(struct udevice *dev, u32 *a)
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{
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struct bootcount_spi_flash_priv *priv = dev_get_priv(dev);
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u16 val;
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if (spi_flash_read_dm(priv->spi_flash, priv->offset, 2, &val) < 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_spi_flash_probe(struct udevice *dev)
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{
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struct ofnode_phandle_args phandle_args;
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struct bootcount_spi_flash_priv *priv = dev_get_priv(dev);
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struct udevice *spi_flash;
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if (dev_read_phandle_with_args(dev, "spi-flash", NULL, 0, 0, &phandle_args)) {
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debug("%s: spi-flash backing device not specified\n", dev->name);
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return -ENOENT;
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}
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if (uclass_get_device_by_ofnode(UCLASS_SPI_FLASH, phandle_args.node, &spi_flash)) {
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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->spi_flash = spi_flash;
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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_spi_flash_ops = {
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.get = bootcount_spi_flash_get,
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.set = bootcount_spi_flash_set,
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};
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static const struct udevice_id bootcount_spi_flash_ids[] = {
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{ .compatible = "u-boot,bootcount-spi-flash" },
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{ }
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};
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U_BOOT_DRIVER(bootcount_spi_flash) = {
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.name = "bootcount-spi-flash",
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.id = UCLASS_BOOTCOUNT,
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.priv_auto = sizeof(struct bootcount_spi_flash_priv),
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.probe = bootcount_spi_flash_probe,
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.of_match = bootcount_spi_flash_ids,
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.ops = &bootcount_spi_flash_ops,
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};
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