Reorganize gpmc-onenand initialization so that changes
required for gpmc driver migration can be made smooth.

Ensuring sync read/write are disabled in onenand cannot
be expected to work properly unless GPMC is setup, this
has been removed.

Refactor set_async_mode & set_sync_mode functions to
separate out timing calculation & actual configuration
(GPMC & OneNAND side).

Thanks to Jon for his suggestions.

Signed-off-by: Afzal Mohammed <redacted>
---

v4:
Reorganize set_sync/async functions in a better way
v3:
Refactor set_sync/async functions to separate out timing and
 configurations
v2:
Move ensuring that async mode in OneNAND has been setup from
 set_sync to setup function, improve commit message

 arch/arm/mach-omap2/gpmc-onenand.c |  153 +++++++++++++++++++-----------------
 1 file changed, 83 insertions(+), 70 deletions(-)

diff --git a/arch/arm/mach-omap2/gpmc-onenand.c b/arch/arm/mach-omap2/gpmc-onenand.c
index 8863e0a..878182b 100644
--- a/arch/arm/mach-omap2/gpmc-onenand.c
+++ b/arch/arm/mach-omap2/gpmc-onenand.c

@@ -15,6 +15,7 @@
 #include <linux/platform_device.h>
 #include <linux/mtd/onenand_regs.h>
 #include <linux/io.h>
+#include <linux/err.h>
 
 #include <asm/mach/flash.h>
 

@@ -25,6 +26,7 @@
 
 #define	ONENAND_IO_SIZE	SZ_128K
 
+static int hf, vhf, sync_read, sync_write, latency;