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drivers/mtd/cfi_mtd.c
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/* * (C) Copyright 2008 Semihalf * * Written by: Piotr Ziecik <kosmo@semihalf.com> * * SPDX-License-Identifier: GPL-2.0+ */ #include <common.h> #include <flash.h> #include <malloc.h> #include <linux/errno.h> #include <linux/mtd/mtd.h> #include <linux/mtd/concat.h> #include <mtd/cfi_flash.h> static struct mtd_info cfi_mtd_info[CFI_MAX_FLASH_BANKS]; static char cfi_mtd_names[CFI_MAX_FLASH_BANKS][16]; #ifdef CONFIG_MTD_CONCAT static char c_mtd_name[16]; #endif static int cfi_mtd_erase(struct mtd_info *mtd, struct erase_info *instr) { flash_info_t *fi = mtd->priv; size_t a_start = fi->start[0] + instr->addr; size_t a_end = a_start + instr->len; int s_first = -1; int s_last = -1; int error, sect; for (sect = 0; sect < fi->sector_count; sect++) { if (a_start == fi->start[sect]) s_first = sect; if (sect < fi->sector_count - 1) { if (a_end == fi->start[sect + 1]) { s_last = sect; break; } } else { s_last = sect; break; } } if (s_first >= 0 && s_first <= s_last) { instr->state = MTD_ERASING; flash_set_verbose(0); error = flash_erase(fi, s_first, s_last); flash_set_verbose(1); if (error) { instr->state = MTD_ERASE_FAILED; return -EIO; } instr->state = MTD_ERASE_DONE; mtd_erase_callback(instr); return 0; } return -EINVAL; } static int cfi_mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { flash_info_t *fi = mtd->priv; u_char *f = (u_char*)(fi->start[0]) + from; memcpy(buf, f, len); *retlen = len; return 0; } static int cfi_mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf) { flash_info_t *fi = mtd->priv; u_long t = fi->start[0] + to; int error; flash_set_verbose(0); error = write_buff(fi, (u_char*)buf, t, len); flash_set_verbose(1); if (!error) { *retlen = len; return 0; } return -EIO; } static void cfi_mtd_sync(struct mtd_info *mtd) { /* * This function should wait until all pending operations * finish. However this driver is fully synchronous, so * this function returns immediately */ } static int cfi_mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) { flash_info_t *fi = mtd->priv; flash_set_verbose(0); flash_protect(FLAG_PROTECT_SET, fi->start[0] + ofs, fi->start[0] + ofs + len - 1, fi); flash_set_verbose(1); return 0; } static int cfi_mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) { flash_info_t *fi = mtd->priv; flash_set_verbose(0); flash_protect(FLAG_PROTECT_CLEAR, fi->start[0] + ofs, fi->start[0] + ofs + len - 1, fi); flash_set_verbose(1); return 0; } static int cfi_mtd_set_erasesize(struct mtd_info *mtd, flash_info_t *fi) { int sect_size = 0; int sect_size_old = 0; int sect; int regions = 0; int numblocks = 0; ulong offset; ulong base_addr; /* * First detect the number of eraseregions so that we can allocate * the array of eraseregions correctly */ for (sect = 0; sect < fi->sector_count; sect++) { if (sect_size_old != flash_sector_size(fi, sect)) regions++; sect_size_old = flash_sector_size(fi, sect); } switch (regions) { case 0: return 1; case 1: /* flash has uniform erase size */ mtd->numeraseregions = 0; mtd->erasesize = sect_size_old; return 0; } mtd->numeraseregions = regions; mtd->eraseregions = malloc(sizeof(struct mtd_erase_region_info) * regions); /* * Now detect the largest sector and fill the eraseregions */ regions = 0; base_addr = offset = fi->start[0]; sect_size_old = flash_sector_size(fi, 0); for (sect = 0; sect < fi->sector_count; sect++) { if (sect_size_old != flash_sector_size(fi, sect)) { mtd->eraseregions[regions].offset = offset - base_addr; mtd->eraseregions[regions].erasesize = sect_size_old; mtd->eraseregions[regions].numblocks = numblocks; /* Now start counting the next eraseregions */ numblocks = 0; regions++; offset = fi->start[sect]; } numblocks++; /* * Select the largest sector size as erasesize (e.g. for UBI) */ if (flash_sector_size(fi, sect) > sect_size) sect_size = flash_sector_size(fi, sect); sect_size_old = flash_sector_size(fi, sect); } /* * Set the last region */ mtd->eraseregions[regions].offset = offset - base_addr; mtd->eraseregions[regions].erasesize = sect_size_old; mtd->eraseregions[regions].numblocks = numblocks; mtd->erasesize = sect_size; return 0; } int cfi_mtd_init(void) { struct mtd_info *mtd; flash_info_t *fi; int error, i; #ifdef CONFIG_MTD_CONCAT int devices_found = 0; struct mtd_info *mtd_list[CONFIG_SYS_MAX_FLASH_BANKS]; #endif for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) { fi = &flash_info[i]; mtd = &cfi_mtd_info[i]; memset(mtd, 0, sizeof(struct mtd_info)); error = cfi_mtd_set_erasesize(mtd, fi); if (error) continue; sprintf(cfi_mtd_names[i], "nor%d", i); mtd->name = cfi_mtd_names[i]; mtd->type = MTD_NORFLASH; mtd->flags = MTD_CAP_NORFLASH; mtd->size = fi->size; mtd->writesize = 1; mtd->writebufsize = mtd->writesize; mtd->_erase = cfi_mtd_erase; mtd->_read = cfi_mtd_read; mtd->_write = cfi_mtd_write; mtd->_sync = cfi_mtd_sync; mtd->_lock = cfi_mtd_lock; mtd->_unlock = cfi_mtd_unlock; mtd->priv = fi; if (add_mtd_device(mtd)) return -ENOMEM; #ifdef CONFIG_MTD_CONCAT mtd_list[devices_found++] = mtd; #endif } #ifdef CONFIG_MTD_CONCAT if (devices_found > 1) { /* * We detected multiple devices. Concatenate them together. */ sprintf(c_mtd_name, "nor%d", devices_found); mtd = mtd_concat_create(mtd_list, devices_found, c_mtd_name); if (mtd == NULL) return -ENXIO; if (add_mtd_device(mtd)) return -ENOMEM; } #endif /* CONFIG_MTD_CONCAT */ return 0; } |