diff options
| author | John Crispin <john@phrozen.org> | 2016-06-20 23:32:09 +0200 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@free-electrons.com> | 2016-07-11 08:40:15 +0200 |
| commit | f45eb7b522359260606852d79a8899e5db37d8f3 (patch) | |
| tree | 5e11a4959ee19d1c4f52c10a93f574b3867a2fd4 /drivers/mtd | |
| parent | mtd: nand: xway: convert to normal platform driver (diff) | |
| download | linux-f45eb7b522359260606852d79a8899e5db37d8f3.tar.xz linux-f45eb7b522359260606852d79a8899e5db37d8f3.zip | |
mtd: nand: xway: Avoid messing up with IO_ADDR_W in ->cmd_ctrl()
The ->cmd_ctrl() function is adjusting the ->IO_ADDR_W value depending
on the command type each time NAND_CTRL_CHANGE is passed. This is not
only useless but can lead to an ->IO_ADDR_W corruption.
Get rid of this logic and rely on the NAND_CLE and NAND_ALE flags to
deduce the iomem address to write the cmd argument to.
Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/xway_nand.c | 26 |
1 files changed, 11 insertions, 15 deletions
diff --git a/drivers/mtd/nand/xway_nand.c b/drivers/mtd/nand/xway_nand.c index ec189e5b4459..6028edbad644 100644 --- a/drivers/mtd/nand/xway_nand.c +++ b/drivers/mtd/nand/xway_nand.c @@ -107,22 +107,18 @@ static void xway_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) unsigned long nandaddr = (unsigned long) this->IO_ADDR_W; unsigned long flags; - if (ctrl & NAND_CTRL_CHANGE) { - nandaddr &= ~(NAND_WRITE_CMD | NAND_WRITE_ADDR); - if (ctrl & NAND_CLE) - nandaddr |= NAND_WRITE_CMD; - else - nandaddr |= NAND_WRITE_ADDR; - this->IO_ADDR_W = (void __iomem *) nandaddr; - } + if (cmd == NAND_CMD_NONE) + return; - if (cmd != NAND_CMD_NONE) { - spin_lock_irqsave(&ebu_lock, flags); - writeb(cmd, this->IO_ADDR_W); - while ((ltq_ebu_r32(EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0) - ; - spin_unlock_irqrestore(&ebu_lock, flags); - } + spin_lock_irqsave(&ebu_lock, flags); + if (ctrl & NAND_CLE) + writeb(cmd, (void __iomem *) (nandaddr | NAND_WRITE_CMD)); + else if (ctrl & NAND_ALE) + writeb(cmd, (void __iomem *) (nandaddr | NAND_WRITE_ADDR)); + + while ((ltq_ebu_r32(EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0) + ; + spin_unlock_irqrestore(&ebu_lock, flags); } static int xway_dev_ready(struct mtd_info *mtd) |