P4080/mtd: Fix the freescale lbc issue with 36bit mode

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Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=0b824d2b10eacd496c608a7c41a046862d48563b
Commit:     0b824d2b10eacd496c608a7c41a046862d48563b
Parent:     3ab8f2a2e7011c5e83363b42950757e46ef06824
Author:     Lan Chunhe-B25806 <b25806 at freescale.com>
AuthorDate: Mon Oct 18 15:22:32 2010 +0800
Committer:  David Woodhouse <David.Woodhouse at intel.com>
CommitDate: Mon Oct 25 15:41:04 2010 +0100

    P4080/mtd: Fix the freescale lbc issue with 36bit mode
    
    When system uses 36bit physical address, res.start is 36bit
    physical address. But the function of in_be32 returns 32bit
    physical address. Then both of them compared each other is
    wrong. So by converting the address of res.start into
    the right format fixes this issue.
    
    Signed-off-by: Lan Chunhe-B25806 <b25806 at freescale.com>
    Signed-off-by: Roy Zang <tie-fei.zang at freescale.com>
    Reviewed-by: Anton Vorontsov <cbouatmailru at gmail.com>
    Signed-off-by: David Woodhouse <David.Woodhouse at intel.com>
---
 arch/powerpc/include/asm/fsl_lbc.h |    1 +
 arch/powerpc/sysdev/fsl_lbc.c      |   23 ++++++++++++++++++++++-
 drivers/mtd/nand/fsl_elbc_nand.c   |    2 +-
 3 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/fsl_lbc.h b/arch/powerpc/include/asm/fsl_lbc.h
index 06a1112..5c1bf34 100644
--- a/arch/powerpc/include/asm/fsl_lbc.h
+++ b/arch/powerpc/include/asm/fsl_lbc.h
@@ -248,6 +248,7 @@ struct fsl_upm {
 	int width;
 };
 
+extern u32 fsl_lbc_addr(phys_addr_t addr_base);
 extern int fsl_lbc_find(phys_addr_t addr_base);
 extern int fsl_upm_find(phys_addr_t addr_base, struct fsl_upm *upm);
 
diff --git a/arch/powerpc/sysdev/fsl_lbc.c b/arch/powerpc/sysdev/fsl_lbc.c
index 91c9c53..4fcb5a4 100644
--- a/arch/powerpc/sysdev/fsl_lbc.c
+++ b/arch/powerpc/sysdev/fsl_lbc.c
@@ -34,6 +34,27 @@ struct fsl_lbc_ctrl *fsl_lbc_ctrl_dev;
 EXPORT_SYMBOL(fsl_lbc_ctrl_dev);
 
 /**
+ * fsl_lbc_addr - convert the base address
+ * @addr_base:	base address of the memory bank
+ *
+ * This function converts a base address of lbc into the right format for the
+ * BR register. If the SOC has eLBC then it returns 32bit physical address
+ * else it convers a 34bit local bus physical address to correct format of
+ * 32bit address for BR register (Example: MPC8641).
+ */
+u32 fsl_lbc_addr(phys_addr_t addr_base)
+{
+	struct device_node *np = fsl_lbc_ctrl_dev->dev->of_node;
+	u32 addr = addr_base & 0xffff8000;
+
+	if (of_device_is_compatible(np, "fsl,elbc"))
+		return addr;
+
+	return addr | ((addr_base & 0x300000000ull) >> 19);
+}
+EXPORT_SYMBOL(fsl_lbc_addr);
+
+/**
  * fsl_lbc_find - find Localbus bank
  * @addr_base:	base address of the memory bank
  *
@@ -55,7 +76,7 @@ int fsl_lbc_find(phys_addr_t addr_base)
 		__be32 br = in_be32(&lbc->bank[i].br);
 		__be32 or = in_be32(&lbc->bank[i].or);
 
-		if (br & BR_V && (br & or & BR_BA) == addr_base)
+		if (br & BR_V && (br & or & BR_BA) == fsl_lbc_addr(addr_base))
 			return i;
 	}
 
diff --git a/drivers/mtd/nand/fsl_elbc_nand.c b/drivers/mtd/nand/fsl_elbc_nand.c
index cd8de29..c141b07 100644
--- a/drivers/mtd/nand/fsl_elbc_nand.c
+++ b/drivers/mtd/nand/fsl_elbc_nand.c
@@ -868,7 +868,7 @@ static int __devinit fsl_elbc_nand_probe(struct platform_device *pdev)
 		    (in_be32(&lbc->bank[bank].br) & BR_MSEL) == BR_MS_FCM &&
 		    (in_be32(&lbc->bank[bank].br) &
 		     in_be32(&lbc->bank[bank].or) & BR_BA)
-		     == res.start)
+		     == fsl_lbc_addr(res.start))
 			break;
 
 	if (bank >= MAX_BANKS) {