diff options
| author | Sekhar Nori <nsekhar@ti.com> | 2010-08-09 15:46:35 +0530 |
|---|---|---|
| committer | Kevin Hilman <khilman@deeprootsystems.com> | 2010-09-24 07:40:26 -0700 |
| commit | 8060ef4da9e73f461adf2ba1922ea5400a61cf98 (patch) | |
| tree | c2b32a3ba886a40803aba15dd6f52852e912b846 /arch/arm/mach-davinci/include | |
| parent | 13d36a923da6a1e0584e07d91320373c790c01c3 (diff) | |
davinci: add support for aemif timing configuration
This patch adds support to configure the AEMIF interface
with supplied timing values.
Since this capability is useful both from NOR and NAND
flashes, it is provided as a new interface and in a file
of its own.
AEMIF timing configuration is required in cases:
1) Where the AEMIF clock rate can change at runtime (a side
affect of cpu frequency change).
2) Where U-Boot does not support NAND/NOR but supports other
media like SPI Flash or MMC/SD and thus does not care about
setting up the AEMIF timing for kernel to use.
3) Where U-Boot just hasn't configured the timing values and
cannot be upgraded because the box is already in the field.
Since there is now a header file for AEMIF interface, the
common (non-NAND specific) defines for AEMIF registers have
been moved from nand.h into the newly created aemif.h
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Acked-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Diffstat (limited to 'arch/arm/mach-davinci/include')
| -rw-r--r-- | arch/arm/mach-davinci/include/mach/aemif.h | 36 | ||||
| -rw-r--r-- | arch/arm/mach-davinci/include/mach/nand.h | 3 |
2 files changed, 36 insertions, 3 deletions
diff --git a/arch/arm/mach-davinci/include/mach/aemif.h b/arch/arm/mach-davinci/include/mach/aemif.h new file mode 100644 index 000000000000..05b293443097 --- /dev/null +++ b/arch/arm/mach-davinci/include/mach/aemif.h @@ -0,0 +1,36 @@ +/* + * TI DaVinci AEMIF support + * + * Copyright 2010 (C) Texas Instruments, Inc. http://www.ti.com/ + * + * This file is licensed under the terms of the GNU General Public License + * version 2. This program is licensed "as is" without any warranty of any + * kind, whether express or implied. + */ +#ifndef _MACH_DAVINCI_AEMIF_H +#define _MACH_DAVINCI_AEMIF_H + +#define NRCSR_OFFSET 0x00 +#define AWCCR_OFFSET 0x04 +#define A1CR_OFFSET 0x10 + +#define ACR_ASIZE_MASK 0x3 +#define ACR_EW_MASK BIT(30) +#define ACR_SS_MASK BIT(31) + +/* All timings in nanoseconds */ +struct davinci_aemif_timing { + u8 wsetup; + u8 wstrobe; + u8 whold; + + u8 rsetup; + u8 rstrobe; + u8 rhold; + + u8 ta; +}; + +int davinci_aemif_setup_timing(struct davinci_aemif_timing *t, + void __iomem *base, unsigned cs); +#endif diff --git a/arch/arm/mach-davinci/include/mach/nand.h b/arch/arm/mach-davinci/include/mach/nand.h index b2ad8090bd10..b5893f035fea 100644 --- a/arch/arm/mach-davinci/include/mach/nand.h +++ b/arch/arm/mach-davinci/include/mach/nand.h @@ -30,9 +30,6 @@ #include <linux/mtd/nand.h> -#define NRCSR_OFFSET 0x00 -#define AWCCR_OFFSET 0x04 -#define A1CR_OFFSET 0x10 #define NANDFCR_OFFSET 0x60 #define NANDFSR_OFFSET 0x64 #define NANDF1ECC_OFFSET 0x70 |