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