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authorKamal Dasu <kdasu.kdev@gmail.com>2014-05-02 04:51:19 +0400
committerBrian Norris <computersforpeace@gmail.com>2014-05-21 03:35:32 +0400
commit66507c7bc8895f0da6b4ad87e96d61a9f7d7a118 (patch)
treea011e33764deec5b848280f3f2ed386f60967929 /include/linux/mtd
parent6e5221558d35563dc656833a021543fba8185c41 (diff)
downloadlinux-66507c7bc8895f0da6b4ad87e96d61a9f7d7a118.tar.xz
mtd: nand: Add support to use nand_base poi databuf as bounce buffer
nand_base can be passed a kmap()'d buffers from highmem by filesystems like jffs2. This results in failure to map the physical address of the DMA buffer on various contoller driver on different platforms. This change adds a chip option to use preallocated databuf as bounce buffers used in nand_do_read_ops() and nand_do_write_ops(). This allows for specific nand controller driver to set this option as needed. Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'include/linux/mtd')
-rw-r--r--include/linux/mtd/nand.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 7a922e6c4e4b..2f0af2891f0f 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -176,6 +176,11 @@ typedef enum {
/* Chip may not exist, so silence any errors in scan */
#define NAND_SCAN_SILENT_NODEV 0x00040000
/*
+ * This option could be defined by controller drivers to protect against
+ * kmap'ed, vmalloc'ed highmem buffers being passed from upper layers
+ */
+#define NAND_USE_BOUNCE_BUFFER 0x00080000
+/*
* Autodetect nand buswidth with readid/onfi.
* This suppose the driver will configure the hardware in 8 bits mode
* when calling nand_scan_ident, and update its configuration