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https://github.com/AsahiLinux/u-boot
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cfa460adfd
A lot changed in the Linux MTD code, since it was last ported from Linux to U-Boot. This patch takes U-Boot NAND support to the level of Linux 2.6.22.1 and will enable support for very large NAND devices (4KB pages) and ease the compatibility between U-Boot and Linux filesystems. This patch is tested on two custom boards with PPC and ARM processors running YAFFS in U-Boot and Linux using gcc-4.1.2 cross compilers. MAKEALL ppc/arm has some issues: * DOC/OneNand/nand_spl is not building (I have not tried porting these parts, and since I do not have any HW and I am not familiar with this code/HW I think its best left to someone else.) Except for the issues mentioned above, I have ported all drivers necessary to run MAKEALL ppc/arm without errors and warnings. Many drivers were trivial to port, but some were not so trivial. The following drivers must be examined carefully and maybe rewritten to some degree: cpu/ppc4xx/ndfc.c cpu/arm926ejs/davinci/nand.c board/delta/nand.c board/zylonite/nand.c Signed-off-by: William Juul <william.juul@tandberg.com> Signed-off-by: Stig Olsen <stig.olsen@tandberg.com> Signed-off-by: Scott Wood <scottwood@freescale.com>
104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
/*
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* (C) Copyright 2000-2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
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* TsiChung Liew (Tsi-Chung.Liew@freescale.com)
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <config.h>
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#include <common.h>
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#include <asm/io.h>
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#include <asm/immap.h>
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DECLARE_GLOBAL_DATA_PTR;
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#if defined(CONFIG_CMD_NAND)
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#include <nand.h>
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#include <linux/mtd/mtd.h>
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#define SET_CLE 0x10
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#define CLR_CLE ~SET_CLE
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#define SET_ALE 0x08
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#define CLR_ALE ~SET_ALE
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static void nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
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{
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struct nand_chip *this = mtdinfo->priv;
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/* volatile fbcs_t *fbcs = (fbcs_t *) MMAP_FBCS; TODO: handle wp */
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u32 nand_baseaddr = (u32) this->IO_ADDR_W;
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if (ctrl & NAND_CTRL_CHANGE) {
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if ( ctrl & NAND_CLE )
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nand_baseaddr |= SET_CLE;
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else
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nand_baseaddr &= CLR_CLE;
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if ( ctrl & NAND_ALE )
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nand_baseaddr |= SET_ALE;
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else
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nand_baseaddr &= CLR_ALE;
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}
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this->IO_ADDR_W = (void __iomem *)(nand_baseaddr);
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if (cmd != NAND_CMD_NONE)
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writeb(cmd, this->IO_ADDR_W);
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}
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static void nand_write_byte(struct mtd_info *mtdinfo, u_char byte)
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{
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struct nand_chip *this = mtdinfo->priv;
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*((volatile u8 *)(this->IO_ADDR_W)) = byte;
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}
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static u8 nand_read_byte(struct mtd_info *mtdinfo)
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{
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struct nand_chip *this = mtdinfo->priv;
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return (u8) (*((volatile u8 *)this->IO_ADDR_R));
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}
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static int nand_dev_ready(struct mtd_info *mtdinfo)
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{
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return 1;
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}
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int board_nand_init(struct nand_chip *nand)
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{
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volatile gpio_t *gpio = (gpio_t *) MMAP_GPIO;
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*((volatile u16 *)CFG_LATCH_ADDR) |= 0x0004;
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/* set up pin configuration */
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gpio->par_timer &= ~GPIO_PAR_TIN3_TIN3;
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gpio->pddr_timer |= 0x08;
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gpio->ppd_timer |= 0x08;
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gpio->pclrr_timer = 0;
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gpio->podr_timer = 0;
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nand->chip_delay = 50;
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nand->ecc.mode = NAND_ECC_SOFT;
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nand->cmd_ctrl = nand_hwcontrol;
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nand->read_byte = nand_read_byte;
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nand->write_byte = nand_write_byte;
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nand->dev_ready = nand_dev_ready;
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return 0;
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}
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#endif
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