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authorLan Chunhe-B25806 <b25806@freescale.com>2010-10-18 11:22:32 +0400
committerDavid Woodhouse <David.Woodhouse@intel.com>2010-10-25 18:41:04 +0400
commit0b824d2b10eacd496c608a7c41a046862d48563b (patch)
tree7322d0b478f1ece6312980b77a5313639cf73d13 /arch/powerpc/sysdev/fsl_lbc.c
parent3ab8f2a2e7011c5e83363b42950757e46ef06824 (diff)
downloadlinux-0b824d2b10eacd496c608a7c41a046862d48563b.tar.xz
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@freescale.com> Signed-off-by: Roy Zang <tie-fei.zang@freescale.com> Reviewed-by: Anton Vorontsov <cbouatmailru@gmail.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'arch/powerpc/sysdev/fsl_lbc.c')
-rw-r--r--arch/powerpc/sysdev/fsl_lbc.c23
1 files changed, 22 insertions, 1 deletions
diff --git a/arch/powerpc/sysdev/fsl_lbc.c b/arch/powerpc/sysdev/fsl_lbc.c
index 91c9c53b1845..4fcb5a4e60dd 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;
}