mirror of
https://github.com/AsahiLinux/u-boot
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131 lines
2.8 KiB
C
131 lines
2.8 KiB
C
/*
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* (C) Copyright 2008 Stefan Roese <sr@denx.de>, DENX Software Engineering
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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 "vct.h"
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static u32 ebi_read(u32 addr)
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{
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addr &= ~0xFC000000;
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reg_write(EBI_CPU_IO_ACCS(EBI_BASE), EXT_DEVICE_CHANNEL_2 | addr);
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ebi_wait();
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return reg_read(EBI_IO_ACCS_DATA(EBI_BASE));
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}
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static int ebi_write_u16(u32 addr, u32 data, int fetchIO)
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{
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u32 val = (data << 16);
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addr &= ~0xFC000000;
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ebi_wait();
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reg_write(EBI_IO_ACCS_DATA(EBI_BASE), val);
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reg_write(EBI_CPU_IO_ACCS(EBI_BASE),
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EXT_DEVICE_CHANNEL_2 | EBI_CPU_WRITE | addr);
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ebi_wait();
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if (fetchIO) {
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u32 counter = 0;
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while (!(reg_read(EBI_SIG_LEVEL(EBI_BASE)) & EXT_CPU_IORDY_SL)) {
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if (counter++ > 0xFFFFFF)
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return 1;
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}
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}
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return 0;
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}
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static u16 ebi_read_u16(u32 addr)
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{
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return ((ebi_read(addr) >> 16) & 0xFFFF);
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}
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static u8 ebi_read_u8(u32 addr)
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{
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u32 val = ebi_read(addr) >> 16;
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if (addr & 0x1)
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return val & 0xff;
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else
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return (val >> 8) & 0xff;
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}
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/*
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* EBI initialization for NOR FLASH access
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*/
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int ebi_init_nor_flash(void)
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{
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reg_write(EBI_DEV1_CONFIG1(EBI_BASE), 0x83000);
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reg_write(EBI_DEV2_CONFIG1(EBI_BASE), 0x400002);
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reg_write(EBI_DEV2_CONFIG2(EBI_BASE), 0x50);
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reg_write(EBI_DEV2_TIM1_RD1(EBI_BASE), 0x409113);
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reg_write(EBI_DEV2_TIM1_RD2(EBI_BASE), 0xFF01000);
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reg_write(EBI_DEV2_TIM1_WR1(EBI_BASE), 0x04003113);
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reg_write(EBI_DEV2_TIM1_WR2(EBI_BASE), 0x3FC12011);
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reg_write(EBI_DEV2_TIM_EXT(EBI_BASE), 0xFFF00000);
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return 0;
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}
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/*
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* Accessor functions replacing the "weak" functions in
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* drivers/mtd/cfi_flash.c
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*/
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void flash_write8(u8 value, void *addr)
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{
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ebi_write_u16((u32)addr, value, 0);
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}
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void flash_write16(u16 value, void *addr)
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{
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ebi_write_u16((u32)addr, value, 0);
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}
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u8 flash_read8(void *addr)
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{
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return ebi_read_u8((u32)addr);
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}
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u16 flash_read16(void *addr)
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{
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return ebi_read_u16((u32)addr);
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}
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u32 flash_read32(void *addr)
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{
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return ((u32)ebi_read_u16((u32)addr) << 16) |
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ebi_read_u16((u32)addr + 2);
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}
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void *board_flash_read_memcpy(void *dest, const void *src, size_t count)
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{
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u16 *tmp = (u16 *)dest, *s = (u16 *)src;
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int i;
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for (i = 0; i < count; i += 2)
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*tmp++ = flash_read16(s++);
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return dest;
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}
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