mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
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>
126 lines
2.9 KiB
C
126 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 <common.h>
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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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