/* * NAND driver for TI DaVinci based boards. * * Copyright (C) 2007 Sergey Kubushyn * * 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 #include #include #include #include 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; }