target/linux/lantiq/patches-4.4/0017-MTD-xway-fix-nand-locking.patch

   1 From aa705c1b0860da91f2ed1a4c0b57337e6de689e1 Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Thu, 7 Aug 2014 18:55:31 +0200
   4 Subject: [PATCH 17/36] MTD: xway: fix nand locking
   5
   6 Signed-off-by: John Crispin <blogic@openwrt.org>
   7 ---
   8  drivers/mtd/nand/xway_nand.c |   15 +++------------
   9  1 file changed, 3 insertions(+), 12 deletions(-)
  10
  11 --- a/drivers/mtd/nand/xway_nand.c
  12 +++ b/drivers/mtd/nand/xway_nand.c
  13 @@ -80,13 +80,16 @@ static void xway_reset_chip(struct nand_
  14
  15  static void xway_select_chip(struct mtd_info *mtd, int chip)
  16  {
  17 +       static unsigned long csflags;
  18
  19         switch (chip) {
  20         case -1:
  21                 ltq_ebu_w32_mask(NAND_CON_CE, 0, EBU_NAND_CON);
  22                 ltq_ebu_w32_mask(NAND_CON_NANDM, 0, EBU_NAND_CON);
  23 +               spin_unlock_irqrestore(&ebu_lock, csflags);
  24                 break;
  25         case 0:
  26 +               spin_lock_irqsave(&ebu_lock, csflags);
  27                 ltq_ebu_w32_mask(0, NAND_CON_NANDM, EBU_NAND_CON);
  28                 ltq_ebu_w32_mask(0, NAND_CON_CE, EBU_NAND_CON);
  29                 break;
  30 @@ -99,7 +102,6 @@ static void xway_cmd_ctrl(struct mtd_inf
  31  {
  32         struct nand_chip *this = mtd->priv;
  33         unsigned long nandaddr = (unsigned long) this->IO_ADDR_W;
  34 -       unsigned long flags;
  35
  36         if (ctrl & NAND_CTRL_CHANGE) {
  37                 if (ctrl & NAND_CLE)
  38 @@ -109,11 +111,9 @@ static void xway_cmd_ctrl(struct mtd_inf
  39         }
  40
  41         if (cmd != NAND_CMD_NONE) {
  42 -               spin_lock_irqsave(&ebu_lock, flags);
  43                 writeb(cmd, (void __iomem *) (nandaddr | xway_latchcmd));
  44                 while ((ltq_ebu_r32(EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0)
  45                         ;
  46 -               spin_unlock_irqrestore(&ebu_lock, flags);
  47         }
  48  }
  49
  50 @@ -126,12 +126,9 @@ static unsigned char xway_read_byte(stru
  51  {
  52         struct nand_chip *this = mtd->priv;
  53         unsigned long nandaddr = (unsigned long) this->IO_ADDR_R;
  54 -       unsigned long flags;
  55         int ret;
  56
  57 -       spin_lock_irqsave(&ebu_lock, flags);
  58         ret = ltq_r8((void __iomem *)(nandaddr | NAND_READ_DATA));
  59 -       spin_unlock_irqrestore(&ebu_lock, flags);
  60
  61         return ret;
  62  }
  63 @@ -140,26 +137,20 @@ static void xway_read_buf(struct mtd_inf
  64  {
  65         struct nand_chip *this = mtd->priv;
  66         unsigned long nandaddr = (unsigned long) this->IO_ADDR_R;
  67 -       unsigned long flags;
  68         int i;
  69
  70 -       spin_lock_irqsave(&ebu_lock, flags);
  71         for (i = 0; i < len; i++)
  72                 buf[i] = ltq_r8((void __iomem *)(nandaddr | NAND_READ_DATA));
  73 -       spin_unlock_irqrestore(&ebu_lock, flags);
  74  }
  75
  76  static void xway_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
  77  {
  78         struct nand_chip *this = mtd->priv;
  79         unsigned long nandaddr = (unsigned long) this->IO_ADDR_W;
  80 -       unsigned long flags;
  81         int i;
  82
  83 -       spin_lock_irqsave(&ebu_lock, flags);
  84         for (i = 0; i < len; i++)
  85                 ltq_w8(buf[i], (void __iomem *)(nandaddr | NAND_WRITE_DATA));
  86 -       spin_unlock_irqrestore(&ebu_lock, flags);
  87  }
  88
  89  static int xway_nand_probe(struct platform_device *pdev)