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map.h
/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org> et al. */ /* Overhauled routines for dealing with different mmap regions of flash */ #ifndef __LINUX_MTD_MAP_H__ #define __LINUX_MTD_MAP_H__ #include <linux/types.h> #include <linux/list.h> #include <linux/string.h> #include <linux/bug.h> #include <linux/kernel.h> #include <linux/io.h> #include <asm/unaligned.h> #include <asm/barrier.h> #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_WIDTH_4 case 4: #endif #ifdef CONFIG_MTD_MAP_BANK_WIDTH_8 case 8: #endif #ifdef CONFIG_MTD_MAP_BANK_WIDTH_16 case 16: #endif #ifdef CONFIG_MTD_MAP_BANK_WIDTH_32 case 32: #endif return 1; default: return 0; } } #define MAX_MAP_LONGS (((MAX_MAP_BANKWIDTH * 8) + BITS_PER_LONG - 1) / BITS_PER_LONG) typedef union { unsigned long x[MAX_MAP_LONGS]; } map_word; /* The map stuff is very simple. You fill in your struct map_info with a handful of routines for accessing the device, making sure they handle paging etc. correctly if your device needs it. Then you pass it off to a chip probe routine -- either JEDEC or CFI probe or both -- via do_map_probe(). If a chip is recognised, the probe code will invoke the appropriate chip driver (if present) and return a struct mtd_info. At which point, you fill in the mtd->module with your own module address, and register it with the MTD core code. Or you could partition it and register the partitions instead, or keep it for your own private use; whatever. The mtd->priv field will point to the struct map_info, and any further private data required by the chip driver is linked from the mtd->priv->fldrv_priv field. This allows the map driver to get at the destructor function map->fldrv_destroy() when it's tired of living. */ struct map_info { const char *name; unsigned long size; resource_size_t phys; #define NO_XIP (-1UL) void __iomem *virt; void *cached; int swap; /* this mapping's byte-swapping requirement */ int bankwidth; /* in octets. This isn't necessarily the width of actual bus cycles -- it's the repeat interval in bytes, before you are talking to the first chip again. */ #ifdef CONFIG_MTD_COMPLEX_MAPPINGS map_word (*read)(struct map_info *, unsigned long); void (*copy_from)(struct map_info *, void *, unsigned long, ssize_t); void (*write)(struct map_info *, const map_word, unsigned long); void (*copy_to)(struct map_info *, unsigned long, const void *, ssize_t); /* We can perhaps put in 'point' and 'unpoint' methods, if we really want to enable XIP for non-linear mappings. Not yet though. */ #endif /* It's possible for the map driver to use cached memory in its copy_from implementation (and _only_ with copy_from). However, when the chip driver knows some flash area has changed contents, it will signal it to the map driver through this routine to let the map driver invalidate the corresponding cache as needed. If there is no cache to care about this can be set to NULL. */ void (*inval_cache)(struct map_info *, unsigned long, ssize_t); /* This will be called with 1 as parameter when the first map user * needs VPP, and called with 0 when the last user exits. The map * core maintains a reference counter, and assumes that VPP is a * global resource applying to all mapped flash chips on the system. */ void (*set_vpp)(struct map_info *, int); unsigned long pfow_base; unsigned long map_priv_1; unsigned long map_priv_2; struct device_node *device_node; void *fldrv_priv; struct mtd_chip_driver *fldrv; }; struct mtd_chip_driver { struct mtd_info *(*probe)(struct map_info *map); void (*destroy)(struct mtd_info *); struct module *module; char *name; struct list_head list; }; void register_mtd_chip_driver(struct mtd_chip_driver *); void unregister_mtd_chip_driver(struct mtd_chip_driver *); struct mtd_info *do_map_probe(const char *name, struct map_info *map); void map_destroy(struct mtd_info *mtd); #define ENABLE_VPP(map) do { if (map->set_vpp) map->set_vpp(map, 1); } while (0) #define DISABLE_VPP(map) do { if (map->set_vpp) map->set_vpp(map, 0); } while (0) #define INVALIDATE_CACHED_RANGE(map, from, size) \ do { if (map->inval_cache) map->inval_cache(map, from, size); } while (0) #define map_word_equal(map, val1, val2) \ ({ \ int i, ret = 1; \ for (i = 0; i < map_words(map); i++) \ if ((val1).x[i] != (val2).x[i]) { \ ret = 0; \ break; \ } \ ret; \ }) #define map_word_and(map, val1, val2) \ ({ \ map_word r; \ int i; \ for (i = 0; i < map_words(map); i++) \ r.x[i] = (val1).x[i] & (val2).x[i]; \ r; \ }) #define map_word_clr(map, val1, val2) \ ({ \ map_word r; \ int i; \ for (i = 0; i < map_words(map); i++) \ r.x[i] = (val1).x[i] & ~(val2).x[i]; \ r; \ }) #define map_word_or(map, val1, val2) \ ({ \ map_word r; \ int i; \ for (i = 0; i < map_words(map); i++) \ r.x[i] = (val1).x[i] | (val2).x[i]; \ r; \ }) #define map_word_andequal(map, val1, val2, val3) \ ({ \ int i, ret = 1; \ for (i = 0; i < map_words(map); i++) { \ if (((val1).x[i] & (val2).x[i]) != (val3).x[i]) { \ ret = 0; \ break; \ } \ } \ ret; \ }) #define map_word_bitsset(map, val1, val2) \ ({ \ int i, ret = 0; \ for (i = 0; i < map_words(map); i++) { \ if ((val1).x[i] & (val2).x[i]) { \ ret = 1; \ break; \ } \ } \ ret; \ }) static inline map_word map_word_load(struct map_info *map, const void *ptr) { map_word r; if (map_bankwidth_is_1(map)) r.x[0] = *(unsigned char *)ptr; else if (map_bankwidth_is_2(map)) r.x[0] = get_unaligned((uint16_t *)ptr); else if (map_bankwidth_is_4(map)) r.x[0] = get_unaligned((uint32_t *)ptr); #if BITS_PER_LONG >= 64 else if (map_bankwidth_is_8(map)) r.x[0] = get_unaligned((uint64_t *)ptr); #endif else if (map_bankwidth_is_large(map)) memcpy(r.x, ptr, map->bankwidth); else BUG(); return r; } static inline map_word map_word_load_partial(struct map_info *map, map_word orig, const unsigned char *buf, int start, int len) { int i; if (map_bankwidth_is_large(map)) { char *dest = (char *)&orig; memcpy(dest+start, buf, len); } else { for (i = start; i < start+len; i++) { int bitpos; #ifdef __LITTLE_ENDIAN bitpos = i * 8; #else /* __BIG_ENDIAN */ bitpos = (map_bankwidth(map) - 1 - i) * 8; #endif orig.x[0] &= ~(0xff << bitpos); orig.x[0] |= (unsigned long)buf[i-start] << bitpos; } } return orig; } #if BITS_PER_LONG < 64 #define MAP_FF_LIMIT 4 #else #define MAP_FF_LIMIT 8 #endif static inline map_word map_word_ff(struct map_info *map) { map_word r; int i; if (map_bankwidth(map) < MAP_FF_LIMIT) { int bw = 8 * map_bankwidth(map); r.x[0] = (1UL << bw) - 1; } else { for (i = 0; i < map_words(map); i++) r.x[i] = ~0UL; } return r; } static inline map_word inline_map_read(struct map_info *map, unsigned long ofs) { map_word r; if (map_bankwidth_is_1(map)) r.x[0] = __raw_readb(map->virt + ofs); else if (map_bankwidth_is_2(map)) r.x[0] = __raw_readw(map->virt + ofs); else if (map_bankwidth_is_4(map)) r.x[0] = __raw_readl(map->virt + ofs); #if BITS_PER_LONG >= 64 else if (map_bankwidth_is_8(map)) r.x[0] = __raw_readq(map->virt + ofs); #endif else if (map_bankwidth_is_large(map)) memcpy_fromio(r.x, map->virt + ofs, map->bankwidth); else BUG(); return r; } static inline void inline_map_write(struct map_info *map, const map_word datum, unsigned long ofs) { if (map_bankwidth_is_1(map)) __raw_writeb(datum.x[0], map->virt + ofs); else if (map_bankwidth_is_2(map)) __raw_writew(datum.x[0], map->virt + ofs); else if (map_bankwidth_is_4(map)) __raw_writel(datum.x[0], map->virt + ofs); #if BITS_PER_LONG >= 64 else if (map_bankwidth_is_8(map)) __raw_writeq(datum.x[0], map->virt + ofs); #endif else if (map_bankwidth_is_large(map)) memcpy_toio(map->virt+ofs, datum.x, map->bankwidth); else BUG(); mb(); } static inline void inline_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) { if (map->cached) memcpy(to, (char *)map->cached + from, len); else memcpy_fromio(to, map->virt + from, len); } static inline void inline_map_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) { memcpy_toio(map->virt + to, from, len); } #ifdef CONFIG_MTD_COMPLEX_MAPPINGS #define map_read(map, ofs) (map)->read(map, ofs) #define map_copy_from(map, to, from, len) (map)->copy_from(map, to, from, len) #define map_write(map, datum, ofs) (map)->write(map, datum, ofs) #define map_copy_to(map, to, from, len) (map)->copy_to(map, to, from, len) extern void simple_map_init(struct map_info *); #define map_is_linear(map) (map->phys != NO_XIP) #else #define map_read(map, ofs) inline_map_read(map, ofs) #define map_copy_from(map, to, from, len) inline_map_copy_from(map, to, from, len) #define map_write(map, datum, ofs) inline_map_write(map, datum, ofs) #define map_copy_to(map, to, from, len) inline_map_copy_to(map, to, from, len) #define simple_map_init(map) BUG_ON(!map_bankwidth_supported((map)->bankwidth)) #define map_is_linear(map) ({ (void)(map); 1; }) #endif /* !CONFIG_MTD_COMPLEX_MAPPINGS */ #endif /* __LINUX_MTD_MAP_H__ */
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