From 50752790bc9285c0c1c5235e88f3a4ef2eec1e72 Mon Sep 17 00:00:00 2001 From: Stefan Roese Date: Wed, 21 Jan 2009 17:24:39 +0100 Subject: MIPS: Add VCT board series support (Part 1/3) Signed-off-by: Stefan Roese --- board/micronas/vct/ebi_nor_flash.c | 131 +++++++++++++++++++++++++++++++++++++ 1 file changed, 131 insertions(+) create mode 100644 board/micronas/vct/ebi_nor_flash.c (limited to 'board/micronas/vct/ebi_nor_flash.c') diff --git a/board/micronas/vct/ebi_nor_flash.c b/board/micronas/vct/ebi_nor_flash.c new file mode 100644 index 0000000..ae87643 --- /dev/null +++ b/board/micronas/vct/ebi_nor_flash.c @@ -0,0 +1,131 @@ +/* + * (C) Copyright 2008 Stefan Roese , DENX Software Engineering + * + * 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., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include +#include +#include "vct.h" + +static u32 ebi_read(u32 addr) +{ + addr &= ~0xFC000000; + + reg_write(EBI_CPU_IO_ACCS(EBI_BASE), EXT_DEVICE_CHANNEL_2 | addr); + ebi_wait(); + + return reg_read(EBI_IO_ACCS_DATA(EBI_BASE)); +} + +static int ebi_write_u16(u32 addr, u32 data, int fetchIO) +{ + u32 val = (data << 16); + + addr &= ~0xFC000000; + + ebi_wait(); + + reg_write(EBI_IO_ACCS_DATA(EBI_BASE), val); + reg_write(EBI_CPU_IO_ACCS(EBI_BASE), + EXT_DEVICE_CHANNEL_2 | EBI_CPU_WRITE | addr); + ebi_wait(); + + if (fetchIO) { + u32 counter = 0; + while (!(reg_read(EBI_SIG_LEVEL(EBI_BASE)) & EXT_CPU_IORDY_SL)) { + if (counter++ > 0xFFFFFF) + return 1; + } + } + + return 0; +} + +static u16 ebi_read_u16(u32 addr) +{ + return ((ebi_read(addr) >> 16) & 0xFFFF); +} + +static u8 ebi_read_u8(u32 addr) +{ + u32 val = ebi_read(addr) >> 16; + + if (addr & 0x1) + return val & 0xff; + else + return (val >> 8) & 0xff; +} + +/* + * EBI initialization for NOR FLASH access + */ +int ebi_init_nor_flash(void) +{ + reg_write(EBI_DEV1_CONFIG1(EBI_BASE), 0x83000); + + reg_write(EBI_DEV2_CONFIG1(EBI_BASE), 0x400002); + reg_write(EBI_DEV2_CONFIG2(EBI_BASE), 0x50); + + reg_write(EBI_DEV2_TIM1_RD1(EBI_BASE), 0x409113); + reg_write(EBI_DEV2_TIM1_RD2(EBI_BASE), 0xFF01000); + reg_write(EBI_DEV2_TIM1_WR1(EBI_BASE), 0x04003113); + reg_write(EBI_DEV2_TIM1_WR2(EBI_BASE), 0x3FC12011); + reg_write(EBI_DEV2_TIM_EXT(EBI_BASE), 0xFFF00000); + + return 0; +} + +/* + * Accessor functions replacing the "weak" functions in + * drivers/mtd/cfi_flash.c + */ +void flash_write8(u8 value, void *addr) +{ + ebi_write_u16((u32)addr, value, 0); +} + +void flash_write16(u16 value, void *addr) +{ + ebi_write_u16((u32)addr, value, 0); +} + +u8 flash_read8(void *addr) +{ + return ebi_read_u8((u32)addr); +} + +u16 flash_read16(void *addr) +{ + return ebi_read_u16((u32)addr); +} + +u32 flash_read32(void *addr) +{ + return ((u32)ebi_read_u16((u32)addr) << 16) | + ebi_read_u16((u32)addr + 2); +} + +void *board_flash_read_memcpy(void *dest, const void *src, size_t count) +{ + u16 *tmp = (u16 *)dest, *s = (u16 *)src; + int i; + + for (i = 0; i < count; i += 2) + *tmp++ = flash_read16(s++); + + return dest; +} -- cgit v1.1