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-rw-r--r--target/linux/lantiq/patches-3.8/0033-MTD-lantiq-xway-make-nand-actually-work.patch122
1 files changed, 122 insertions, 0 deletions
diff --git a/target/linux/lantiq/patches-3.8/0033-MTD-lantiq-xway-make-nand-actually-work.patch b/target/linux/lantiq/patches-3.8/0033-MTD-lantiq-xway-make-nand-actually-work.patch
new file mode 100644
index 0000000000..89044d5770
--- /dev/null
+++ b/target/linux/lantiq/patches-3.8/0033-MTD-lantiq-xway-make-nand-actually-work.patch
@@ -0,0 +1,122 @@
+From cc77f36d2ea812027dc2a8a94c788c4c145f82dc Mon Sep 17 00:00:00 2001
+From: John Crispin <blogic@openwrt.org>
+Date: Mon, 22 Oct 2012 10:25:39 +0200
+Subject: [PATCH 33/40] MTD: lantiq: xway: make nand actually work
+
+http://lists.infradead.org/pipermail/linux-mtd/2012-September/044240.html
+
+Signed-off-by: John Crispin <blogic@openwrt.org>
+---
+ drivers/mtd/nand/xway_nand.c | 54 +++++++++++++++++++++++++++++++++++-------
+ 1 file changed, 45 insertions(+), 9 deletions(-)
+
+diff --git a/drivers/mtd/nand/xway_nand.c b/drivers/mtd/nand/xway_nand.c
+index 3f81dc8..49b2e47 100644
+--- a/drivers/mtd/nand/xway_nand.c
++++ b/drivers/mtd/nand/xway_nand.c
+@@ -54,19 +54,29 @@
+ #define NAND_CON_CSMUX (1 << 1)
+ #define NAND_CON_NANDM 1
+
++static u32 xway_latchcmd;
++
+ static void xway_reset_chip(struct nand_chip *chip)
+ {
+ unsigned long nandaddr = (unsigned long) chip->IO_ADDR_W;
+ unsigned long flags;
++ unsigned long timeout;
+
+ nandaddr &= ~NAND_WRITE_ADDR;
+ nandaddr |= NAND_WRITE_CMD;
+
+ /* finish with a reset */
++ timeout = jiffies + msecs_to_jiffies(200);
++
+ spin_lock_irqsave(&ebu_lock, flags);
++
+ writeb(NAND_WRITE_CMD_RESET, (void __iomem *) nandaddr);
+- while ((ltq_ebu_r32(EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0)
+- ;
++ do {
++ if ((ltq_ebu_r32(EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0)
++ break;
++ cond_resched();
++ } while (!time_after_eq(jiffies, timeout));
++
+ spin_unlock_irqrestore(&ebu_lock, flags);
+ }
+
+@@ -94,17 +104,15 @@ static void xway_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+ 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;
++ xway_latchcmd = NAND_WRITE_CMD;
++ else if (ctrl & NAND_ALE)
++ xway_latchcmd = NAND_WRITE_ADDR;
+ }
+
+ if (cmd != NAND_CMD_NONE) {
+ spin_lock_irqsave(&ebu_lock, flags);
+- writeb(cmd, this->IO_ADDR_W);
++ 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);
+@@ -124,12 +132,38 @@ static unsigned char xway_read_byte(struct mtd_info *mtd)
+ int ret;
+
+ spin_lock_irqsave(&ebu_lock, flags);
+- ret = ltq_r8((void __iomem *)(nandaddr + NAND_READ_DATA));
++ ret = ltq_r8((void __iomem *)(nandaddr | NAND_READ_DATA));
+ spin_unlock_irqrestore(&ebu_lock, flags);
+
+ return ret;
+ }
+
++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)
+ {
+ struct nand_chip *this = platform_get_drvdata(pdev);
+@@ -175,6 +209,8 @@ static struct platform_nand_data xway_nand_data = {
+ .dev_ready = xway_dev_ready,
+ .select_chip = xway_select_chip,
+ .read_byte = xway_read_byte,
++ .read_buf = xway_read_buf,
++ .write_buf = xway_write_buf,
+ }
+ };
+
+--
+1.7.10.4
+