18 $ a4()P@ /F2/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright © 2000-2010 David Woodhouse et al. */ /* Overhauled routines for dealing with different mmap regions of flash */ #ifndef __LINUX_MTD_MAP_H__ #define __LINUX_MTD_MAP_H__ #include #include #include #include #include #include #include #include #ifdef CONFIG_MTD_MAP_BANK_WIDTH_1 #define map_bankwidth(map) 1 #define map_bankwidth_is_1(map) (map_bankwidth(map) == 1) #define map_bankwidth_is_large(map) (0) #define map_words(map) (1) #define MAX_MAP_BANKWIDTH 1 #else #define map_bankwidth_is_1(map) (0) #endif #ifdef CONFIG_MTD_MAP_BANK_WIDTH_2 # ifdef map_bankwidth # undef map_bankwidth # define map_bankwidth(map) ((map)->bankwidth) # else # define map_bankwidth(map) 2 # define map_bankwidth_is_large(map) (0) # define map_words(map) (1) # endif #define map_bankwidth_is_2(map) (map_bankwidth(map) == 2) #undef MAX_MAP_BANKWIDTH #define MAX_MAP_BANKWIDTH 2 #else #define map_bankwidth_is_2(map) (0) #endif #ifdef CONFIG_MTD_MAP_BANK_WIDTH_4 # ifdef map_bankwidth # undef map_bankwidth # define map_bankwidth(map) ((map)->bankwidth) # else # define map_bankwidth(map) 4 # define map_bankwidth_is_large(map) (0) # define map_words(map) (1) # endif #define map_bankwidth_is_4(map) (map_bankwidth(map) == 4) #undef MAX_MAP_BANKWIDTH #define MAX_MAP_BANKWIDTH 4 #else #define map_bankwidth_is_4(map) (0) #endif /* ensure we never evaluate anything shorted than an unsigned long * to zero, and ensure we'll never miss the end of an comparison (bjd) */ #define map_calc_words(map) ((map_bankwidth(map) + (sizeof(unsigned long)-1)) / sizeof(unsigned long)) #ifdef CONFIG_MTD_MAP_BANK_WIDTH_8 # ifdef map_bankwidth # undef map_bankwidth # define map_bankwidth(map) ((map)->bankwidth) # if BITS_PER_LONG < 64 # undef map_bankwidth_is_large # define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8) # undef map_words # define map_words(map) map_calc_words(map) # endif # else # define map_bankwidth(map) 8 # define map_bankwidth_is_large(map) (BITS_PER_LONG < 64) # define map_words(map) map_calc_words(map) # endif #define map_bankwidth_is_8(map) (map_bankwidth(map) == 8) #undef MAX_MAP_BANKWIDTH #define MAX_MAP_BANKWIDTH 8 #else #define map_bankwidth_is_8(map) (0) #endif #ifdef CONFIG_MTD_MAP_BANK_WIDTH_16 # ifdef map_bankwidth # undef map_bankwidth # define map_bankwidth(map) ((map)->bankwidth) # undef map_bankwidth_is_large # define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8) # undef map_words # define map_words(map) map_calc_words(map) # else # define map_bankwidth(map) 16 # define map_bankwidth_is_large(map) (1) # define map_words(map) map_calc_words(map) # endif #define map_bankwidth_is_16(map) (map_bankwidth(map) == 16) #undef MAX_MAP_BANKWIDTH #define MAX_MAP_BANKWIDTH 16 #else #define map_bankwidth_is_16(map) (0) #endif #ifdef CONFIG_MTD_MAP_BANK_WIDTH_32 /* always use indirect access for 256-bit to preserve kernel stack */ # undef map_bankwidth # define map_bankwidth(map) ((map)->bankwidth) # undef map_bankwidth_is_large # define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8) # undef map_words # define map_words(map) map_calc_words(map) #define map_bankwidth_is_32(map) (map_bankwidth(map) == 32) #undef MAX_MAP_BANKWIDTH #define MAX_MAP_BANKWIDTH 32 #else #define map_bankwidth_is_32(map) (0) #endif #ifndef map_bankwidth #ifdef CONFIG_MTD #warning "No CONFIG_MTD_MAP_BANK_WIDTH_xx selected. No NOR chip support can work" #endif static inline int map_bankwidth(void *map) { BUG(); return 0; } #define map_bankwidth_is_large(map) (0) #define map_words(map) (0) #define MAX_MAP_BANKWIDTH 1 #endif static inline int map_bankwidth_supported(int w) { switch (w) { #ifdef CONFIG_MTD_MAP_BANK_WIDTH_1 case 1: #endif #ifdef CONFIG_MTD_MAP_BANK_WIDTH_2 case 2: #endif #ifdef CONFIG_MTD_MAP_BANK_WI