From bbaf5aaf4b430f2139e5f561b6372008d26766a2 Mon Sep 17 00:00:00 2001 From: John Crispin Date: Thu, 7 Aug 2014 18:55:31 +0200 Subject: [PATCH 17/31] MTD: xway: fix nand locking Signed-off-by: John Crispin --- drivers/mtd/nand/xway_nand.c | 15 +++------------ 1 file changed, 3 insertions(+), 12 deletions(-) diff --git a/drivers/mtd/nand/xway_nand.c b/drivers/mtd/nand/xway_nand.c index f813a55..e430f2d 100644 --- a/drivers/mtd/nand/xway_nand.c +++ b/drivers/mtd/nand/xway_nand.c @@ -80,13 +80,16 @@ static void xway_reset_chip(struct nand_chip *chip) static void xway_select_chip(struct mtd_info *mtd, int chip) { + static unsigned long csflags; switch (chip) { case -1: ltq_ebu_w32_mask(NAND_CON_CE, 0, EBU_NAND_CON); ltq_ebu_w32_mask(NAND_CON_NANDM, 0, EBU_NAND_CON); + spin_unlock_irqrestore(&ebu_lock, csflags); break; case 0: + spin_lock_irqsave(&ebu_lock, csflags); ltq_ebu_w32_mask(0, NAND_CON_NANDM, EBU_NAND_CON); ltq_ebu_w32_mask(0, NAND_CON_CE, EBU_NAND_CON); break; @@ -99,7 +102,6 @@ static void xway_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) { struct nand_chip *this = mtd->priv; unsigned long nandaddr = (unsigned long) this->IO_ADDR_W; - unsigned long flags; if (ctrl & NAND_CTRL_CHANGE) { if (ctrl & NAND_CLE) @@ -109,11 +111,9 @@ static void xway_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) } if (cmd != NAND_CMD_NONE) { - spin_lock_irqsave(&ebu_lock, flags); writeb(cmd, (void __iomem *) (nandaddr | xway_latchcmd)); while ((ltq_ebu_r32(EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0) ; - spin_unlock_irqrestore(&ebu_lock, flags); } } @@ -126,12 +126,9 @@ static unsigned char xway_read_byte(struct mtd_info *mtd) { struct nand_chip *this = mtd->priv; unsigned long nandaddr = (unsigned long) this->IO_ADDR_R; - unsigned long flags; int ret; - spin_lock_irqsave(&ebu_lock, flags); ret = ltq_r8((void __iomem *)(nandaddr | NAND_READ_DATA)); - spin_unlock_irqrestore(&ebu_lock, flags); return ret; } @@ -140,26 +137,20 @@ static void xway_read_buf(struct mtd_info *mtd, u_char *buf, int len) { struct nand_chip *this = mtd->priv; unsigned long nandaddr = (unsigned long) this->IO_ADDR_R; - unsigned long flags; int i; - spin_lock_irqsave(&ebu_lock, flags); for (i = 0; i < len; i++) buf[i] = ltq_r8((void __iomem *)(nandaddr | NAND_READ_DATA)); - spin_unlock_irqrestore(&ebu_lock, flags); } static void xway_write_buf(struct mtd_info *mtd, const u_char *buf, int len) { struct nand_chip *this = mtd->priv; unsigned long nandaddr = (unsigned long) this->IO_ADDR_W; - unsigned long flags; int i; - spin_lock_irqsave(&ebu_lock, flags); for (i = 0; i < len; i++) ltq_w8(buf[i], (void __iomem *)nandaddr); - spin_unlock_irqrestore(&ebu_lock, flags); } static int xway_nand_probe(struct platform_device *pdev) -- 1.7.10.4