name : bcm963xx_nvram.h /* 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__ */