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https://github.com/AsahiLinux/u-boot
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152 lines
5.2 KiB
ArmAsm
152 lines
5.2 KiB
ArmAsm
/*
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* (C) Copyright 2001
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* Thomas Koeller, tkoeller@gmx.net
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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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#ifndef __ASSEMBLY__
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#define __ASSEMBLY__ 1
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#endif
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#include <config.h>
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#include <asm/processor.h>
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#include <mpc824x.h>
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#include <ppc_asm.tmpl>
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#if defined(USE_DINK32)
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/* We are running from RAM, so do not clear the MCCR1_MEMGO bit! */
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#define MCCR1VAL ((CFG_ROMNAL << MCCR1_ROMNAL_SHIFT) | (CFG_ROMFAL << MCCR1_ROMFAL_SHIFT) | MCCR1_MEMGO)
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#else
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#define MCCR1VAL (CFG_ROMNAL << MCCR1_ROMNAL_SHIFT) | (CFG_ROMFAL << MCCR1_ROMFAL_SHIFT)
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#endif
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.text
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/* Values to program into memory controller registers */
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tbl: .long MCCR1, MCCR1VAL
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.long MCCR2, CFG_REFINT << MCCR2_REFINT_SHIFT
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.long MCCR3
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.long (((CFG_BSTOPRE & 0x000000f0) >> 4) << MCCR3_BSTOPRE2TO5_SHIFT) | \
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(CFG_REFREC << MCCR3_REFREC_SHIFT) | \
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(CFG_RDLAT << MCCR3_RDLAT_SHIFT)
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.long MCCR4
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.long (CFG_PRETOACT << MCCR4_PRETOACT_SHIFT) | (CFG_ACTTOPRE << MCCR4_ACTTOPRE_SHIFT) | \
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(CFG_REGISTERD_TYPE_BUFFER << 20) | \
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(((CFG_BSTOPRE & 0x00000300) >> 8) << MCCR4_BSTOPRE0TO1_SHIFT ) | \
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((CFG_SDMODE_CAS_LAT << 4) | (CFG_SDMODE_WRAP << 3) | \
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(CFG_SDMODE_BURSTLEN) << MCCR4_SDMODE_SHIFT) | \
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(CFG_ACTTORW << MCCR4_ACTTORW_SHIFT) | \
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((CFG_BSTOPRE & 0x0000000f) << MCCR4_BSTOPRE6TO9_SHIFT )
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.long MSAR1
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.long (((CFG_BANK0_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 0) | \
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(((CFG_BANK1_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 8) | \
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(((CFG_BANK2_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 16) | \
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(((CFG_BANK3_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 24)
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.long EMSAR1
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.long (((CFG_BANK0_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 0) | \
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(((CFG_BANK1_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 8) | \
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(((CFG_BANK2_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 16) | \
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(((CFG_BANK3_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 24)
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.long MSAR2
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.long (((CFG_BANK4_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 0) | \
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(((CFG_BANK5_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 8) | \
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(((CFG_BANK6_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 16) | \
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(((CFG_BANK7_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 24)
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.long EMSAR2
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.long (((CFG_BANK4_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 0) | \
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(((CFG_BANK5_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 8) | \
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(((CFG_BANK6_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 16) | \
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(((CFG_BANK7_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 24)
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.long MEAR1
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.long (((CFG_BANK0_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 0) | \
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(((CFG_BANK1_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 8) | \
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(((CFG_BANK2_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 16) | \
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(((CFG_BANK3_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 24)
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.long EMEAR1
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.long (((CFG_BANK0_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 0) | \
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(((CFG_BANK1_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 8) | \
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(((CFG_BANK2_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 16) | \
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(((CFG_BANK3_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 24)
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.long MEAR2
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.long (((CFG_BANK4_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 0) | \
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(((CFG_BANK5_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 8) | \
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(((CFG_BANK6_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 16) | \
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(((CFG_BANK7_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 24)
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.long EMEAR2
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.long (((CFG_BANK4_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 0) | \
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(((CFG_BANK5_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 8) | \
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(((CFG_BANK6_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 16) | \
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(((CFG_BANK7_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 24)
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.long 0
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/*
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* Early CPU initialization. Set up memory controller, so we can access any RAM at all. This
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* must be done in assembly, since we have no stack at this point.
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*/
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.global early_init_f
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early_init_f:
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mflr r10
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/* basic memory controller configuration */
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lis r3, CONFIG_ADDR_HIGH
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lis r4, CONFIG_DATA_HIGH
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bl lab
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lab: mflr r5
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lwzu r0, tbl - lab(r5)
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loop: lwz r1, 4(r5)
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stwbrx r0, 0, r3
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eieio
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stwbrx r1, 0, r4
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eieio
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lwzu r0, 8(r5)
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cmpli cr0, 0, r0, 0
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bne cr0, loop
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/* set bank enable bits */
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lis r0, MBER@h
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ori r0, 0, MBER@l
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li r1, CFG_BANK_ENABLE
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stwbrx r0, 0, r3
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eieio
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stb r1, 0(r4)
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eieio
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/* delay loop */
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lis r0, 0x0003
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mtctr r0
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delay: bdnz delay
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/* enable memory controller */
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lis r0, MCCR1@h
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ori r0, 0, MCCR1@l
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stwbrx r0, 0, r3
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eieio
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lwbrx r0, 0, r4
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oris r0, 0, MCCR1_MEMGO@h
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stwbrx r0, 0, r4
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eieio
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/* set up stack pointer */
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lis r1, CFG_INIT_SP_OFFSET@h
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ori r1, r1, CFG_INIT_SP_OFFSET@l
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mtlr r10
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blr
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