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/*
* NAND driver for TI DaVinci based boards.
*
* Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
*
* Based on Linux DaVinci NAND driver by TI. Original copyright follows:
*/
/*
*
* linux/drivers/mtd/nand/nand_davinci.c
*
* NAND Flash Driver
*
* Copyright (C) 2006 Texas Instruments.
*
* ----------------------------------------------------------------------------
*
* 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.
* ----------------------------------------------------------------------------
*
* Overview:
* This is a device driver for the NAND flash device found on the
* DaVinci board which utilizes the Samsung k9k2g08 part.
*
Modifications:
ver. 1.0: Feb 2005, Vinod/Sudhakar
-
*
*/
#include <common.h>
#include <asm/io.h>
#include <nand.h>
#include <asm/arch/nand_defs.h>
#include <asm/arch/emif_defs.h>
static emif_registers *const emif_regs = (void *) DAVINCI_ASYNC_EMIF_CNTRL_BASE;
static void nand_davinci_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
struct nand_chip *this = mtd->priv;
u_int32_t IO_ADDR_W = (u_int32_t)this->IO_ADDR_W;
IO_ADDR_W &= ~(MASK_ALE|MASK_CLE);
if (ctrl & NAND_CTRL_CHANGE) {
if ( ctrl & NAND_CLE )
IO_ADDR_W |= MASK_CLE;
if ( ctrl & NAND_ALE )
IO_ADDR_W |= MASK_ALE;
this->IO_ADDR_W = (void __iomem *) IO_ADDR_W;
}
if (cmd != NAND_CMD_NONE)
writeb(cmd, this->IO_ADDR_W);
}
#ifdef CONFIG_SYS_NAND_HW_ECC
static void nand_davinci_enable_hwecc(struct mtd_info *mtd, int mode)
{
int dummy;
dummy = emif_regs->NANDF1ECC;
/* FIXME: only chipselect 0 is supported for now */
emif_regs->NANDFCR |= 1 << 8;
}
static u_int32_t nand_davinci_readecc(struct mtd_info *mtd, u_int32_t region)
{
u_int32_t ecc = 0;
if (region == 1)
ecc = emif_regs->NANDF1ECC;
else if (region == 2)
ecc = emif_regs->NANDF2ECC;
else if (region == 3)
ecc = emif_regs->NANDF3ECC;
else if (region == 4)
ecc = emif_regs->NANDF4ECC;
return(ecc);
}
static int nand_davinci_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code)
{
u_int32_t tmp;
const int region = 1;
tmp = nand_davinci_readecc(mtd, region);
/* Squeeze 4 bytes ECC into 3 bytes by removing RESERVED bits
* and shifting. RESERVED bits are 31 to 28 and 15 to 12. */
tmp = (tmp & 0x00000fff) | ((tmp & 0x0fff0000) >> 4);
/* Invert so that erased block ECC is correct */
tmp = ~tmp;
*ecc_code++ = tmp;
*ecc_code++ = tmp >> 8;
*ecc_code++ = tmp >> 16;
/* NOTE: the above code matches mainline Linux:
* .PQR.stu ==> ~PQRstu
*
* MontaVista/TI kernels encode those bytes differently, use
* complicated (and allegedly sometimes-wrong) correction code,
* and usually shipped with U-Boot that uses software ECC:
* .PQR.stu ==> PsQRtu
*
* If you need MV/TI compatible NAND I/O in U-Boot, it should
* be possible to (a) change the mangling above, (b) reverse
* that mangling in nand_davinci_correct_data() below.
*/
return 0;
}
static int nand_davinci_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc, u_char *calc_ecc)
{
struct nand_chip *this = mtd->priv;
u_int32_t ecc_nand = read_ecc[0] | (read_ecc[1] << 8) |
(read_ecc[2] << 16);
u_int32_t ecc_calc = calc_ecc[0] | (calc_ecc[1] << 8) |
(calc_ecc[2] << 16);
u_int32_t diff = ecc_calc ^ ecc_nand;
if (diff) {
if ((((diff >> 12) ^ diff) & 0xfff) == 0xfff) {
/* Correctable error */
if ((diff >> (12 + 3)) < this->ecc.size) {
uint8_t find_bit = 1 << ((diff >> 12) & 7);
uint32_t find_byte = diff >> (12 + 3);
dat[find_byte] ^= find_bit;
MTDDEBUG(MTD_DEBUG_LEVEL0, "Correcting single "
"bit ECC error at offset: %d, bit: "
"%d\n", find_byte, find_bit);
return 1;
} else {
return -1;
}
} else if (!(diff & (diff - 1))) {
/* Single bit ECC error in the ECC itself,
nothing to fix */
MTDDEBUG(MTD_DEBUG_LEVEL0, "Single bit ECC error in "
"ECC.\n");
return 1;
} else {
/* Uncorrectable error */
MTDDEBUG(MTD_DEBUG_LEVEL0, "ECC UNCORRECTED_ERROR 1\n");
return -1;
}
}
return(0);
}
#endif /* CONFIG_SYS_NAND_HW_ECC */
static int nand_davinci_dev_ready(struct mtd_info *mtd)
{
return emif_regs->NANDFSR & 0x1;
}
static void nand_flash_init(void)
{
/* This is for DM6446 EVM and *very* similar. DO NOT GROW THIS!
* Instead, have your board_init() set EMIF timings, based on its
* knowledge of the clocks and what devices are hooked up ... and
* don't even do that unless no UBL handled it.
*/
#ifdef CONFIG_SOC_DM644X
u_int32_t acfg1 = 0x3ffffffc;
/*------------------------------------------------------------------*
* NAND FLASH CHIP TIMEOUT @ 459 MHz *
* *
* AEMIF.CLK freq = PLL1/6 = 459/6 = 76.5 MHz *
* AEMIF.CLK period = 1/76.5 MHz = 13.1 ns *
* *
*------------------------------------------------------------------*/
acfg1 = 0
| (0 << 31 ) /* selectStrobe */
| (0 << 30 ) /* extWait */
| (1 << 26 ) /* writeSetup 10 ns */
| (3 << 20 ) /* writeStrobe 40 ns */
| (1 << 17 ) /* writeHold 10 ns */
| (1 << 13 ) /* readSetup 10 ns */
| (5 << 7 ) /* readStrobe 60 ns */
| (1 << 4 ) /* readHold 10 ns */
| (3 << 2 ) /* turnAround ?? ns */
| (0 << 0 ) /* asyncSize 8-bit bus */
;
emif_regs->AB1CR = acfg1; /* CS2 */
emif_regs->NANDFCR = 0x00000101; /* NAND flash on CS2 */
#endif
}
void davinci_nand_init(struct nand_chip *nand)
{
nand->chip_delay = 0;
#ifdef CONFIG_SYS_NAND_USE_FLASH_BBT
nand->options = NAND_USE_FLASH_BBT;
#endif
#ifdef CONFIG_SYS_NAND_HW_ECC
nand->ecc.mode = NAND_ECC_HW;
nand->ecc.size = 512;
nand->ecc.bytes = 3;
nand->ecc.calculate = nand_davinci_calculate_ecc;
nand->ecc.correct = nand_davinci_correct_data;
nand->ecc.hwctl = nand_davinci_enable_hwecc;
#else
nand->ecc.mode = NAND_ECC_SOFT;
#endif /* CONFIG_SYS_NAND_HW_ECC */
/* Set address of hardware control function */
nand->cmd_ctrl = nand_davinci_hwcontrol;
nand->dev_ready = nand_davinci_dev_ready;
nand_flash_init();
}
int board_nand_init(struct nand_chip *chip) __attribute__((weak));
int board_nand_init(struct nand_chip *chip)
{
davinci_nand_init(chip);
return 0;
}
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