From 480b9dfb1fbeb783d4c0061df7868c39af91afec Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Wed, 7 Feb 2007 13:55:19 +0200 Subject: [PATCH] [MTD] OneNAND: Invalidate bufferRAM after erase OneNAND has internal bufferRAMs. The driver keeps track of what is in the bufferRAM to save having to load from the NAND core. After an erase operation, the driver must mark bufferRAM invalid if it refers to the erased block. Signed-off-by: Adrian Hunter Signed-off-by: David Woodhouse --- drivers/mtd/onenand/onenand_base.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c index 779327b845..a764579436 100644 --- a/drivers/mtd/onenand/onenand_base.c +++ b/drivers/mtd/onenand/onenand_base.c @@ -635,6 +635,29 @@ static void onenand_update_bufferram(struct mtd_info *mtd, loff_t addr, this->bufferram[i].blockpage = -1; } +/** + * onenand_invalidate_bufferram - [GENERIC] Invalidate BufferRAM information + * @param mtd MTD data structure + * @param addr start address to invalidate + * @param len length to invalidate + * + * Invalidate BufferRAM information + */ +static void onenand_invalidate_bufferram(struct mtd_info *mtd, loff_t addr, + unsigned int len) +{ + struct onenand_chip *this = mtd->priv; + int i; + loff_t end_addr = addr + len; + + /* Invalidate BufferRAM */ + for (i = 0; i < MAX_BUFFERRAM; i++) { + loff_t buf_addr = this->bufferram[i].blockpage << this->page_shift; + if (buf_addr >= addr && buf_addr < end_addr) + this->bufferram[i].blockpage = -1; + } +} + /** * onenand_get_device - [GENERIC] Get chip for selected access * @param mtd MTD device structure @@ -1476,6 +1499,8 @@ static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr) this->command(mtd, ONENAND_CMD_ERASE, addr, block_size); + onenand_invalidate_bufferram(mtd, addr, block_size); + ret = this->wait(mtd, FL_ERASING); /* Check, if it is write protected */ if (ret) { -- 2.39.5