forked from luck/tmp_suning_uos_patched
b9ee2a910d
[ Upstream commit 8c174d1511d235ed6c049dcb2b704777ad0df7a5 ]
These flashes have some weird BP bits mapping which aren't supported in
the current locking code. Just add a simple unlock op to unprotect the
entire flash array which is needed for legacy behavior.
Fixes: 3e0930f109 ("mtd: spi-nor: Rework the disabling of block write protection")
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20201203162959.29589-7-michael@walle.cc
Signed-off-by: Sasha Levin <sashal@kernel.org>
86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2005, Intec Automation Inc.
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* Copyright (C) 2014, Freescale Semiconductor, Inc.
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*/
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#include <linux/mtd/spi-nor.h>
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#include "core.h"
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/*
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* The Atmel AT25FS010/AT25FS040 parts have some weird configuration for the
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* block protection bits. We don't support them. But legacy behavior in linux
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* is to unlock the whole flash array on startup. Therefore, we have to support
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* exactly this operation.
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*/
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static int atmel_at25fs_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
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{
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return -EOPNOTSUPP;
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}
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static int atmel_at25fs_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
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{
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int ret;
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/* We only support unlocking the whole flash array */
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if (ofs || len != nor->params->size)
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return -EINVAL;
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/* Write 0x00 to the status register to disable write protection */
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ret = spi_nor_write_sr_and_check(nor, 0);
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if (ret)
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dev_dbg(nor->dev, "unable to clear BP bits, WP# asserted?\n");
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return ret;
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}
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static int atmel_at25fs_is_locked(struct spi_nor *nor, loff_t ofs, uint64_t len)
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{
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return -EOPNOTSUPP;
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}
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static const struct spi_nor_locking_ops atmel_at25fs_locking_ops = {
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.lock = atmel_at25fs_lock,
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.unlock = atmel_at25fs_unlock,
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.is_locked = atmel_at25fs_is_locked,
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};
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static void atmel_at25fs_default_init(struct spi_nor *nor)
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{
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nor->params->locking_ops = &atmel_at25fs_locking_ops;
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}
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static const struct spi_nor_fixups atmel_at25fs_fixups = {
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.default_init = atmel_at25fs_default_init,
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};
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static const struct flash_info atmel_parts[] = {
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/* Atmel -- some are (confusingly) marketed as "DataFlash" */
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{ "at25fs010", INFO(0x1f6601, 0, 32 * 1024, 4, SECT_4K | SPI_NOR_HAS_LOCK)
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.fixups = &atmel_at25fs_fixups },
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{ "at25fs040", INFO(0x1f6604, 0, 64 * 1024, 8, SECT_4K | SPI_NOR_HAS_LOCK)
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.fixups = &atmel_at25fs_fixups },
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{ "at25df041a", INFO(0x1f4401, 0, 64 * 1024, 8, SECT_4K | SPI_NOR_HAS_LOCK) },
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{ "at25df321", INFO(0x1f4700, 0, 64 * 1024, 64, SECT_4K | SPI_NOR_HAS_LOCK) },
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{ "at25df321a", INFO(0x1f4701, 0, 64 * 1024, 64, SECT_4K | SPI_NOR_HAS_LOCK) },
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{ "at25df641", INFO(0x1f4800, 0, 64 * 1024, 128, SECT_4K | SPI_NOR_HAS_LOCK) },
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{ "at25sl321", INFO(0x1f4216, 0, 64 * 1024, 64,
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SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
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{ "at26f004", INFO(0x1f0400, 0, 64 * 1024, 8, SECT_4K) },
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{ "at26df081a", INFO(0x1f4501, 0, 64 * 1024, 16, SECT_4K | SPI_NOR_HAS_LOCK) },
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{ "at26df161a", INFO(0x1f4601, 0, 64 * 1024, 32, SECT_4K | SPI_NOR_HAS_LOCK) },
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{ "at26df321", INFO(0x1f4700, 0, 64 * 1024, 64, SECT_4K | SPI_NOR_HAS_LOCK) },
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{ "at45db081d", INFO(0x1f2500, 0, 64 * 1024, 16, SECT_4K) },
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};
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const struct spi_nor_manufacturer spi_nor_atmel = {
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.name = "atmel",
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.parts = atmel_parts,
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.nparts = ARRAY_SIZE(atmel_parts),
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};
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