The BF537-STAMP Blackfin board had a driver for working with NAND devices that are simply memory mapped. Since there is nothing Blackfin specific about this, generalize the driver a bit so that everyone can leverage it. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Scott Wood <scottwood@freescale.com>master
Mike Frysinger
15 years ago
committed by
Scott Wood
parent
d27bc728cf
commit
cd84423a09
@ -1,100 +0,0 @@ |
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/*
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* Copyright (c) 2006-2007 Analog Devices Inc. |
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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 <common.h> |
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#include <asm/io.h> |
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#include <nand.h> |
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#define CONCAT(a,b,c,d) a ## b ## c ## d |
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#define PORT(a,b) CONCAT(pPORT,a,b,) |
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#ifndef CONFIG_NAND_GPIO_PORT |
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#define CONFIG_NAND_GPIO_PORT F |
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#endif |
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/*
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* hardware specific access to control-lines |
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*/ |
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static void bfin_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl) |
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{ |
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register struct nand_chip *this = mtd->priv; |
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u32 IO_ADDR_W = (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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IO_ADDR_W = CONFIG_SYS_NAND_BASE + BFIN_NAND_CLE; |
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else |
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IO_ADDR_W = CONFIG_SYS_NAND_BASE; |
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if (ctrl & NAND_ALE) |
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IO_ADDR_W = CONFIG_SYS_NAND_BASE + BFIN_NAND_ALE; |
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else |
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IO_ADDR_W = CONFIG_SYS_NAND_BASE; |
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this->IO_ADDR_W = (void __iomem *) IO_ADDR_W; |
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} |
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this->IO_ADDR_R = this->IO_ADDR_W; |
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/* Drain the writebuffer */ |
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SSYNC(); |
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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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int bfin_device_ready(struct mtd_info *mtd) |
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{ |
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int ret = (*PORT(CONFIG_NAND_GPIO_PORT, IO) & BFIN_NAND_READY) ? 1 : 0; |
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SSYNC(); |
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return ret; |
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} |
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/*
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* Board-specific NAND initialization. The following members of the |
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* argument are board-specific (per include/linux/mtd/nand.h): |
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* - IO_ADDR_R?: address to read the 8 I/O lines of the flash device |
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* - IO_ADDR_W?: address to write the 8 I/O lines of the flash device |
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* - cmd_ctrl: hardwarespecific function for accesing control-lines |
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* - dev_ready: hardwarespecific function for accesing device ready/busy line |
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* - enable_hwecc?: function to enable (reset) hardware ecc generator. Must |
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* only be provided if a hardware ECC is available |
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* - ecc.mode: mode of ecc, see defines |
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* - chip_delay: chip dependent delay for transfering data from array to |
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* read regs (tR) |
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* - options: various chip options. They can partly be set to inform |
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* nand_scan about special functionality. See the defines for further |
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* explanation |
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* Members with a "?" were not set in the merged testing-NAND branch, |
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* so they are not set here either. |
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*/ |
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int board_nand_init(struct nand_chip *nand) |
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{ |
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*PORT(CONFIG_NAND_GPIO_PORT, _FER) &= ~BFIN_NAND_READY; |
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*PORT(CONFIG_NAND_GPIO_PORT, IO_DIR) &= ~BFIN_NAND_READY; |
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*PORT(CONFIG_NAND_GPIO_PORT, IO_INEN) |= BFIN_NAND_READY; |
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nand->cmd_ctrl = bfin_hwcontrol; |
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nand->ecc.mode = NAND_ECC_SOFT; |
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nand->dev_ready = bfin_device_ready; |
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nand->chip_delay = 30; |
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return 0; |
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} |
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@ -0,0 +1,53 @@ |
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/*
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* Genericish driver for memory mapped NAND devices |
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* |
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* Copyright (c) 2006-2009 Analog Devices Inc. |
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* Licensed under the GPL-2 or later. |
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*/ |
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/* Your board must implement the following macros:
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* NAND_PLAT_WRITE_CMD(chip, cmd) |
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* NAND_PLAT_WRITE_ADR(chip, cmd) |
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* NAND_PLAT_INIT() |
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* |
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* It may also implement the following: |
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* NAND_PLAT_DEV_READY(chip) |
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*/ |
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#include <common.h> |
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#include <asm/io.h> |
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#include <nand.h> |
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static void plat_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) |
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{ |
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struct nand_chip *this = mtd->priv; |
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if (cmd == NAND_CMD_NONE) |
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return; |
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if (ctrl & NAND_CLE) |
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NAND_PLAT_WRITE_CMD(this, cmd); |
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else |
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NAND_PLAT_WRITE_ADR(this, cmd); |
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} |
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#ifdef NAND_PLAT_DEV_READY |
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static int plat_dev_ready(struct mtd_info *mtd) |
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{ |
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return NAND_PLAT_DEV_READY((struct nand_chip *)mtd->priv); |
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} |
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#else |
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# define plat_dev_ready NULL |
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#endif |
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int board_nand_init(struct nand_chip *nand) |
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{ |
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NAND_PLAT_INIT(); |
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nand->cmd_ctrl = plat_cmd_ctrl; |
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nand->dev_ready = plat_dev_ready; |
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nand->ecc.mode = NAND_ECC_SOFT; |
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return 0; |
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} |
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