// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2005, Intec Automation Inc. * Copyright (C) 2014, Freescale Semiconductor, Inc. */ #include #include "core.h" #define ATMEL_SR_GLOBAL_PROTECT_MASK GENMASK(5, 2) /* * The Atmel AT25FS010/AT25FS040 parts have some weird configuration for the * block protection bits. We don't support them. But legacy behavior in linux * is to unlock the whole flash array on startup. Therefore, we have to support * exactly this operation. */ static int atmel_at25fs_lock(struct spi_nor *nor, loff_t ofs, uint64_t len) { return -EOPNOTSUPP; } static int atmel_at25fs_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len) { int ret; /* We only support unlocking the whole flash array */ if (ofs || len != nor->params->size) return -EINVAL; /* Write 0x00 to the status register to disable write protection */ ret = spi_nor_write_sr_and_check(nor, 0); if (ret) dev_dbg(nor->dev, "unable to clear BP bits, WP# asserted?\n"); return ret; } static int atmel_at25fs_is_locked(struct spi_nor *nor, loff_t ofs, uint64_t len) { return -EOPNOTSUPP; } static const struct spi_nor_locking_ops atmel_at25fs_locking_ops = { .lock = atmel_at25fs_lock, .unlock = atmel_at25fs_unlock, .is_locked = atmel_at25fs_is_locked, }; static void atmel_at25fs_default_init(struct spi_nor *nor) { nor->params->locking_ops = &atmel_at25fs_locking_ops; } static const struct spi_nor_fixups atmel_at25fs_fixups = { .default_init = atmel_at25fs_default_init, }; /** * atmel_set_global_protection - Do a Global Protect or Unprotect command * @nor: pointer to 'struct spi_nor' * @ofs: offset in bytes * @len: len in bytes * @is_protect: if true do a Global Protect otherwise it is a Global Unprotect * * Return: 0 on success, -error otherwise. */ static int atmel_set_global_protection(struct spi_nor *nor, loff_t ofs, uint64_t len, bool is_protect) { int ret; u8 sr; /* We only support locking the whole flash array */ if (ofs || len != nor->params->size) return -EINVAL; ret = spi_nor_read_sr(nor, nor->bouncebuf); if (ret) return ret; sr = nor->bouncebuf[0]; /* SRWD bit needs to be cleared, otherwise the protection doesn't change */ if (sr & SR_SRWD) { sr &= ~SR_SRWD; ret = spi_nor_write_sr_and_check(nor, sr); if (ret) { dev_dbg(nor->dev, "unable to clear SRWD bit, WP# asserted?\n"); return ret; } } if (is_protect) { sr |= ATMEL_SR_GLOBAL_PROTECT_MASK; /* * Set the SRWD bit again as soon as we are protecting * anything. This will ensure that the WP# pin is working * correctly. By doing this we also behave the same as * spi_nor_sr_lock(), which sets SRWD if any block protection * is active. */ sr |= SR_SRWD; } else { sr &= ~ATMEL_SR_GLOBAL_PROTECT_MASK; } nor->bouncebuf[0] = sr; /* * We cannot use the spi_nor_write_sr_and_check() because this command * isn't really setting any bits, instead it is an pseudo command for * "Global Unprotect" or "Global Protect" */ return spi_nor_write_sr(nor, nor->bouncebuf, 1); } static int atmel_global_protect(struct spi_nor *nor, loff_t ofs, uint64_t len) { return atmel_set_global_protection(nor, ofs, len, true); } static int atmel_global_unprotect(struct spi_nor *nor, loff_t ofs, uint64_t len) { return atmel_set_global_protection(nor, ofs, len, false); } static int atmel_is_global_protected(struct spi_nor *nor, loff_t ofs, uint64_t len) { int ret; if (ofs >= nor->params->size || (ofs + len) > nor->params->size) return -EINVAL; ret = spi_nor_read_sr(nor, nor->bouncebuf); if (ret) return ret; return ((nor->bouncebuf[0] & ATMEL_SR_GLOBAL_PROTECT_MASK) == ATMEL_SR_GLOBAL_PROTECT_MASK); } static const struct spi_nor_locking_ops atmel_global_protection_ops = { .lock = atmel_global_protect, .unlock = atmel_global_unprotect, .is_locked = atmel_is_global_protected, }; static void atmel_global_protection_default_init(struct spi_nor *nor) { nor->params->locking_ops = &atmel_global_protection_ops; } static const struct spi_nor_fixups atmel_global_protection_fixups = { .default_init = atmel_global_protection_default_init, }; static const struct flash_info atmel_parts[] = { /* Atmel -- some are (confusingly) marketed as "DataFlash" */ { "at25fs010", INFO(0x1f6601, 0, 32 * 1024, 4, SECT_4K | SPI_NOR_HAS_LOCK) .fixups = &atmel_at25fs_fixups }, { "at25fs040", INFO(0x1f6604, 0, 64 * 1024, 8, SECT_4K | SPI_NOR_HAS_LOCK) .fixups = &atmel_at25fs_fixups }, { "at25df041a", INFO(0x1f4401, 0, 64 * 1024, 8, SECT_4K | SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE) .fixups = &atmel_global_protection_fixups }, { "at25df321", INFO(0x1f4700, 0, 64 * 1024, 64, SECT_4K | SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE) .fixups = &atmel_global_protection_fixups }, { "at25df321a", INFO(0x1f4701, 0, 64 * 1024, 64, SECT_4K | SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE) .fixups = &atmel_global_protection_fixups }, { "at25df641", INFO(0x1f4800, 0, 64 * 1024, 128, SECT_4K | SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE) .fixups = &atmel_global_protection_fixups }, { "at25sl321", INFO(0x1f4216, 0, 64 * 1024, 64, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) }, { "at26f004", INFO(0x1f0400, 0, 64 * 1024, 8, SECT_4K) }, { "at26df081a", INFO(0x1f4501, 0, 64 * 1024, 16, SECT_4K | SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE) .fixups = &atmel_global_protection_fixups }, { "at26df161a", INFO(0x1f4601, 0, 64 * 1024, 32, SECT_4K | SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE) .fixups = &atmel_global_protection_fixups }, { "at26df321", INFO(0x1f4700, 0, 64 * 1024, 64, SECT_4K | SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE) .fixups = &atmel_global_protection_fixups }, { "at45db081d", INFO(0x1f2500, 0, 64 * 1024, 16, SECT_4K) }, }; const struct spi_nor_manufacturer spi_nor_atmel = { .name = "atmel", .parts = atmel_parts, .nparts = ARRAY_SIZE(atmel_parts), };