NAND: davinci_nand driver
Subsystems (5)
PATCH 10/15 NAND: davinci_nand driver
From: David Brownell <[email protected]>
This is a device driver for the NAND flash controller found on the various DaVinci family chips. It handles up to four SoC chipselects, and some flavors of secondary chipselect (e.g. based on upper bits of the address bus) as used with some multichip packages. (Including the 2 GByte chips used on some TI devel boards.)
The 1-bit ECC hardware is supported (3 bytes ECC per 512 bytes data); but not yet the newer 4-bit ECC (10 bytes ECC per 512 bytes data), as available on chips like the DM355 or OMAP-L137 and needed with the more error-prone MLC NAND chips.
This is a cleaned-up version of code that's been in use for several years now; sanity checked with the new drivers/mtd/tests.
Signed-off-by David Brownell <[email protected]>
Cc David Woodhouse <[email protected]>
Signed-off-by Sudhakar Rajashekhara <[email protected]>
Signed-off-by Andrew Morton <[email protected]>
---
arch/arm/mach-davinci/include/mach/nand.h | 80 ++ drivers/mtd/nand/Kconfig | 7 drivers/mtd/nand/Makefile | 1 drivers/mtd/nand/davinci_nand.c | 584 ++++++++++++++++++++ 4 files changed, 672 insertions(+)
arch/arm/mach-davinci/include/mach/nand.h new file +80 -0
@@ -0,0 +1,80 @@ +/* +* mach-davinci/nand.h +* +* Copyright (C) 2006 Texas Instruments. +* +* Ported to 2.6.23 Copyright (C) 2008 by +* Sander Huijsen <[email protected]> +* Troy Kisky <[email protected]> +* Dirk Behme <[email protected]> +* +* -------------------------------------------------------------------------- +* +* This program is free software; you can redistribute it and/or modify +* it under the terms of the GNU General Public License as published by +* the Free Software Foundation; either version 2 of the License, or +* (at your option) any later version. +* +* This program is distributed in the hope that it will be useful, +* but WITHOUT ANY WARRANTY; without even the implied warranty of +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +* GNU General Public License for more details. +* +* You should have received a copy of the GNU General Public License +* along with this program; if not, write to the Free Software +* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#ifndef __ARCH_ARM_DAVINCI_NAND_H +#define __ARCH_ARM_DAVINCI_NAND_H + +#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 + +/* 4-bit ECC syndrome registers */ +#define NAND_4BIT_ECC_LOAD_OFFSET 0xbc +#define NAND_4BIT_ECC1_OFFSET 0xc0 +#define NAND_4BIT_ECC2_OFFSET 0xc4 +#define NAND_4BIT_ECC3_OFFSET 0xc8 +#define NAND_4BIT_ECC4_OFFSET 0xcc +#define NAND_ERR_ADD1_OFFSET 0xd0 +#define NAND_ERR_ADD2_OFFSET 0xd4 +#define NAND_ERR_ERRVAL1_OFFSET 0xd8 +#define NAND_ERR_ERRVAL2_OFFSET 0xdc + +/* NOTE: boards don't need to use these address bits +* for ALE/CLE unless they support booting from NAND. +* They're used unless platform data overrides them. +*/ +#define MASK_ALE 0x08 +#define MASK_CLE 0x10 + +struct davinci_nand_pdata {/* platform_data */ +u32 mask_ale; +u32 mask_cle; + +/* for packages using two chipselects */ +u32 mask_chipsel; + +/* board's default static partition info */ +struct mtd_partition *parts; +unsigned nr_parts; + +/* none == NAND_ECC_NONE (strongly *not* advised!!) +* soft == NAND_ECC_SOFT +* 1-bit == NAND_ECC_HW +* 4-bit == NAND_ECC_HW_SYNDROME (not on all chips) +*/ +nand_ecc_modes_t ecc_mode; + +/* e.g. NAND_BUSWIDTH_16 or NAND_USE_FLASH_BBT */ +unsigned options; +}; + +#endif /* __ARCH_ARM_DAVINCI_NAND_H */
drivers/mtd/nand/Kconfig renamed from drivers/mtd/nand/Kconfig~nand-davinci_nand-driver +7 -0
@@ -433,4 +433,11 @@ config MTD_NAND_TXX9NDFMC help This enables the NAND flash controller on the TXx9 SoCs. +config MTD_NAND_DAVINCI + tristate "Support NAND on DaVinci SoC" + depends on ARCH_DAVINCI + help + Enable the driver for NAND flash chips on Texas Instruments + DaVinci processors. + endif # MTD_NAND
drivers/mtd/nand/Makefile renamed from drivers/mtd/nand/Makefile~nand-davinci_nand-driver +1 -0
@@ -14,6 +14,7 @@ obj-$(CONFIG_MTD_NAND_AU1550) += au1550 obj-$(CONFIG_MTD_NAND_BF5XX) += bf5xx_nand.o obj-$(CONFIG_MTD_NAND_PPCHAMELEONEVB) += ppchameleonevb.o obj-$(CONFIG_MTD_NAND_S3C2410) += s3c2410.o +obj-$(CONFIG_MTD_NAND_DAVINCI) += davinci_nand.o obj-$(CONFIG_MTD_NAND_DISKONCHIP) += diskonchip.o obj-$(CONFIG_MTD_NAND_H1900) += h1910.o obj-$(CONFIG_MTD_NAND_RTC_FROM4) += rtc_from4.o
drivers/mtd/nand/davinci_nand.c new file +584 -0
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