powerpc/axonram: Enable partitioning of the Axons DDR2 DIMMs

DDR2 memory DIMMs on the Axon could be accessed only as one partition
when using file system drivers which are using the direct_access() method.
This patch enables for such file system drivers to access Axon's DDR2 memory
even if it is splitted in several partitions.

Signed-off-by: Maxim Shchetynin <maxim@de.ibm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/arch/powerpc/sysdev/axonram.c b/arch/powerpc/sysdev/axonram.c
index 9b639ede06da..9e105cbc5e5f 100644
--- a/arch/powerpc/sysdev/axonram.c
+++ b/arch/powerpc/sysdev/axonram.c
@@ -150,7 +150,10 @@ axon_ram_direct_access(struct block_device *device, sector_t sector,
         struct axon_ram_bank *bank = device->bd_disk->private_data;
         loff_t offset;
 
-        offset = sector << AXON_RAM_SECTOR_SHIFT;
+        offset = sector;
+        if (device->bd_part != NULL)
+                offset += device->bd_part->start_sect;
+        offset <<= AXON_RAM_SECTOR_SHIFT;
         if (offset >= bank->size) {
                 dev_err(&bank->device->dev, "Access outside of address space\n");
                 return -ERANGE;