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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_BCM963XX_NVRAM_H__
#define __LINUX_BCM963XX_NVRAM_H__
#include <linux/crc32.h>
#include <linux/if_ether.h>
#include <linux/sizes.h>
#include <linux/types.h>
/*
* Broadcom BCM963xx SoC board nvram data structure.
*
* The nvram structure varies in size depending on the SoC board version. Use
* the appropriate minimum BCM963XX_NVRAM_*_SIZE define for the information
* you need instead of sizeof(struct bcm963xx_nvram) as this may change.
*/
#define BCM963XX_NVRAM_V4_SIZE 300
#define BCM963XX_NVRAM_V5_SIZE (1 * SZ_1K)
#define BCM963XX_DEFAULT_PSI_SIZE 64
enum bcm963xx_nvram_nand_part {
BCM963XX_NVRAM_NAND_PART_BOOT = 0,
BCM963XX_NVRAM_NAND_PART_ROOTFS_1,
BCM963XX_NVRAM_NAND_PART_ROOTFS_2,
BCM963XX_NVRAM_NAND_PART_DATA,
BCM963XX_NVRAM_NAND_PART_BBT,
__BCM963XX_NVRAM_NAND_NR_PARTS
};
struct bcm963xx_nvram {
u32 version;
char bootline[256];
char name[16];
u32 main_tp_number;
u32 psi_size;
u32 mac_addr_count;
u8 mac_addr_base[ETH_ALEN];
u8 __reserved1[2];
u32 checksum_v4;
u8 __reserved2[292];
u32 nand_part_offset[__BCM963XX_NVRAM_NAND_NR_PARTS];
u32 nand_part_size[__BCM963XX_NVRAM_NAND_NR_PARTS];
u8 __reserved3[388];
u32 checksum_v5;
};
#define BCM963XX_NVRAM_NAND_PART_OFFSET(nvram, part) \
bcm963xx_nvram_nand_part_offset(nvram, BCM963XX_NVRAM_NAND_PART_ ##part)
static inline u64 __pure bcm963xx_nvram_nand_part_offset(
const struct bcm963xx_nvram *nvram,
enum bcm963xx_nvram_nand_part part)
{
return nvram->nand_part_offset[part] * SZ_1K;
}
#define BCM963XX_NVRAM_NAND_PART_SIZE(nvram, part) \
bcm963xx_nvram_nand_part_size(nvram, BCM963XX_NVRAM_NAND_PART_ ##part)
static inline u64 __pure bcm963xx_nvram_nand_part_size(
const struct bcm963xx_nvram *nvram,
enum bcm963xx_nvram_nand_part part)
{
return nvram->nand_part_size[part] * SZ_1K;
}
/*
* bcm963xx_nvram_checksum - Verify nvram checksum
*
* @nvram: pointer to full size nvram data structure
* @expected_out: optional pointer to store expected checksum value
* @actual_out: optional pointer to store actual checksum value
*
* Return: 0 if the checksum is valid, otherwise -EINVAL
*/
static int __maybe_unused bcm963xx_nvram_checksum(
const struct bcm963xx_nvram *nvram,
u32 *expected_out, u32 *actual_out)
{
u32 expected, actual;
size_t len;
if (nvram->version <= 4) {
expected = nvram->checksum_v4;
len = BCM963XX_NVRAM_V4_SIZE - sizeof(u32);
} else {
expected = nvram->checksum_v5;
len = BCM963XX_NVRAM_V5_SIZE - sizeof(u32);
}
/*
* Calculate the CRC32 value for the nvram with a checksum value
* of 0 without modifying or copying the nvram by combining:
* - The CRC32 of the nvram without the checksum value
* - The CRC32 of a zero checksum value (which is also 0)
*/
actual = crc32_le_combine(
crc32_le(~0, (u8 *)nvram, len), 0, sizeof(u32));
if (expected_out)
*expected_out = expected;
if (actual_out)
*actual_out = actual;
return expected == actual ? 0 : -EINVAL;
};
#endif /* __LINUX_BCM963XX_NVRAM_H__ */
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