* Vimal Singh <vimal.newwork@xxxxxxxxx> [091206 22:39]:
> On Sat, Dec 5, 2009 at 3:47 AM, Tony Lindgren <tony@xxxxxxxxxxx> wrote:
> > Hi,
> >
> > * Vimal Singh <vimal.newwork@xxxxxxxxx> [091203 06:09]:
> >> From 13d52884956a26f93826c443e2b8bd78615f74d6 Mon Sep 17 00:00:00 2001
> >> From: Vimal Singh <vimalsingh@xxxxxx>
> >> Date: Thu, 26 Nov 2009 16:10:24 +0530
> >> Subject: [PATCH] OMAP: SDP: Introducing 'board-sdp-flash.c' for flash init
> >>
> >> This patch adds 'board-sdp-flash.c', which could be utilized
> >> by boards similar to 3430SDP. (For ex: 2430sdp, 36030sdp).
> >>
> >> This file does initialization for all three flash devices present
> >> in SDP boards (NOR, NAND, OneNAND), by finding there 'cs' number
> >> dynamically using switch setting information (S8: 1-4).
> >> This also expects partition information from core board files (for
> >> ex: board-3430sdp.c). Which allows to choose different default
> >> partitions for different boards.
> >>
> >> A new structure is created for this purpose: 'flash_partitions'
> >> in 'mach/board-sdp.h'. This has two members:
> >> 1. struct mtd_partition *parts
> >> 2. int nr_parts
> >>
> >> A board file is expected to fill this structure and pass it to
> >> 'sdp-flsash-init'. Partition information should be passed in
> >> structure array of 'flash_partitions'. Partition information should
> >> be passed in below sequence in array:
> >> NOR
> >> OneNAND
> >> NAND
> >>
> >> Signed-off-by: Vimal Singh <vimalsingh@xxxxxx>
> >> ---
> >> arch/arm/mach-omap2/board-sdp-flash.c | 246 ++++++++++++++++++++++++++
> >> arch/arm/mach-omap2/include/mach/board-sdp.h | 22 +++
> >> arch/arm/plat-omap/include/plat/gpmc.h | 2 +
> >> 3 files changed, 270 insertions(+), 0 deletions(-)
> >> create mode 100644 arch/arm/mach-omap2/board-sdp-flash.c
> >> create mode 100644 arch/arm/mach-omap2/include/mach/board-sdp.h
> >>
> >> diff --git a/arch/arm/mach-omap2/board-sdp-flash.c
> >> b/arch/arm/mach-omap2/board-sdp-flash.c
> >> new file mode 100644
> >> index 0000000..fbbcd0e
> >> --- /dev/null
> >> +++ b/arch/arm/mach-omap2/board-sdp-flash.c
> >
> > <snip>
> >
> >> +__init board_nand_init(struct flash_partitions sdp_nand_parts, u8 cs)
> >> +{
> >> + sdp_nand_data.cs = cs;
> >> + sdp_nand_data.parts = sdp_nand_parts.parts;
> >> + sdp_nand_data.nr_parts = sdp_nand_parts.nr_parts;
> >> +
> >> + sdp_nand_data.gpmc_cs_baseaddr = (void *)(OMAP34XX_GPMC_VIRT +
> >> + GPMC_CS0_BASE +
> >> + cs * GPMC_CS_SIZE);
> >> + sdp_nand_data.gpmc_baseaddr = (void *) (OMAP34XX_GPMC_VIRT);
> >> +
> >> + gpmc_nand_init(&sdp_nand_data);
> >> +}
> >
> > This does not look right. You're supposed to use gpmc_cs_request()
> > for allocating the GPMC area based on the chip select and size.
>
> I guess you are getting confuse a bit here:
> gpmc_baseaddr: is the virtual address for GPMC_REVISION (which is also
> base address for GPMC).
> gpmc_cs_baseaddr : This is offset from above to 'GPMC_CONFIG(cs)' for
> specified cs number.
>
> These are needed by nand driver.
Right.. Looks like drivers/mtd/nand/omap2.c needs to be fixed so we
can get rid of this.
And looks like we already are doing it all over the place anyways :(
> While 'gpmc_cs_request' gives physical address to the device resource.
> And this is done in 'nand/omap2.c'. This is done in driver itself so
> that we don't allocate a resource even before driver gets loaded.
Yuk.. The nand driver should be generic.
> >> --- a/arch/arm/plat-omap/include/plat/gpmc.h
> >> +++ b/arch/arm/plat-omap/include/plat/gpmc.h
> >> @@ -27,6 +27,8 @@
> >>
> >> #define GPMC_CONFIG 0x50
> >> #define GPMC_STATUS 0x54
> >> +#define GPMC_CS0_BASE 0x60
> >> +#define GPMC_CS_SIZE 0x30
> >
> > The GPMC_CS0_BASE and GPMC_CS_SIZE seem to be values specic to
> > your board, not for the GPMC hardware.
>
> These are offsets and very much specific to GPMC hardware.
>
> GPMC_CS0_BASE: is offset from GPMC base to first cs GPMC_CONFIG1 register.
> GPMC_CS_SIZE : is offset (gap) between next cs config registers, e.i.
> size for cs config registers.
Let's keep it local until drivers/mtd/nand/omap2.c is fixed.
Care to take a look at using some generic nand driver instead
if we merge this for now?
Regards,
Tony
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