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// SPDX-License-Identifier: GPL-2.0+
/*
* HPE GXP EEPROM driver
*
* Copyright (C) 2026 9elements GmbH
*/
#include <dm.h>
#include <misc.h>
#include <asm/io.h>
#include <dm/device_compat.h>
#define GXP_EEPROM_BLOCK_SIZE 128
struct gxp_eeprom_priv {
void __iomem *base;
size_t size;
};
static bool gxp_eeprom_validate_checksum(void __iomem *block)
{
u8 version;
u16 sum = 0;
int i;
version = readb(block);
if (version != 2 && version != 3)
return false;
for (i = 0; i < GXP_EEPROM_BLOCK_SIZE / sizeof(u16); i++)
sum += readw(block + i * sizeof(u16));
return sum == 0;
}
static int gxp_eeprom_read(struct udevice *dev, int offset, void *buf,
int size)
{
struct gxp_eeprom_priv *priv = dev_get_priv(dev);
u8 *dst = buf;
int i;
if (offset < 0 || size <= 0 || offset + size > priv->size)
return -EINVAL;
for (i = 0; i < size; i++)
dst[i] = readb(priv->base + offset + i);
return size;
}
static int gxp_eeprom_probe(struct udevice *dev)
{
struct gxp_eeprom_priv *priv = dev_get_priv(dev);
fdt_addr_t addr;
fdt_size_t size;
int i, num_blocks;
addr = dev_read_addr_size(dev, &size);
if (addr == FDT_ADDR_T_NONE) {
dev_err(dev, "failed to get address\n");
return -EINVAL;
}
if (size == 0 || size % GXP_EEPROM_BLOCK_SIZE != 0) {
dev_err(dev, "size must be a multiple of %d bytes\n",
GXP_EEPROM_BLOCK_SIZE);
return -EINVAL;
}
priv->base = map_physmem(addr, size, MAP_NOCACHE);
if (!priv->base) {
dev_err(dev, "failed to map memory\n");
return -ENOMEM;
}
priv->size = size;
num_blocks = size / GXP_EEPROM_BLOCK_SIZE;
for (i = 0; i < num_blocks; i++) {
if (!gxp_eeprom_validate_checksum(priv->base +
i * GXP_EEPROM_BLOCK_SIZE)) {
dev_err(dev, "checksum failed for block %d\n", i);
return -EBADMSG;
}
}
return 0;
}
static const struct misc_ops gxp_eeprom_ops = {
.read = gxp_eeprom_read,
};
static const struct udevice_id gxp_eeprom_ids[] = {
{ .compatible = "hpe,gxp-eeprom" },
{ }
};
U_BOOT_DRIVER(gxp_eeprom) = {
.name = "gxp_eeprom",
.id = UCLASS_MISC,
.of_match = gxp_eeprom_ids,
.probe = gxp_eeprom_probe,
.ops = &gxp_eeprom_ops,
.priv_auto = sizeof(struct gxp_eeprom_priv),
.flags = DM_FLAG_PRE_RELOC,
};
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