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Diffstat (limited to 'board/hidden_dragon/early_init.S')
| -rw-r--r-- | board/hidden_dragon/early_init.S | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/board/hidden_dragon/early_init.S b/board/hidden_dragon/early_init.S new file mode 100644 index 0000000..07dafb7 --- /dev/null +++ b/board/hidden_dragon/early_init.S @@ -0,0 +1,152 @@ +/* + * (C) Copyright 2001 + * Thomas Koeller, tkoeller@gmx.net + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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 + */ + +#ifndef __ASSEMBLY__ +#define __ASSEMBLY__ 1 +#endif + +#include <config.h> +#include <asm/processor.h> +#include <mpc824x.h> +#include <ppc_asm.tmpl> + +#if defined(USE_DINK32) + /* We are running from RAM, so do not clear the MCCR1_MEMGO bit! */ + #define MCCR1VAL ((CFG_ROMNAL << MCCR1_ROMNAL_SHIFT) | (CFG_ROMFAL << MCCR1_ROMFAL_SHIFT) | MCCR1_MEMGO) +#else + #define MCCR1VAL (CFG_ROMNAL << MCCR1_ROMNAL_SHIFT) | (CFG_ROMFAL << MCCR1_ROMFAL_SHIFT) +#endif + + .text + + /* Values to program into memory controller registers */ +tbl: .long MCCR1, MCCR1VAL + .long MCCR2, CFG_REFINT << MCCR2_REFINT_SHIFT + .long MCCR3 + .long (((CFG_BSTOPRE & 0x000000f0) >> 4) << MCCR3_BSTOPRE2TO5_SHIFT) | \ + (CFG_REFREC << MCCR3_REFREC_SHIFT) | \ + (CFG_RDLAT << MCCR3_RDLAT_SHIFT) + .long MCCR4 + .long (CFG_PRETOACT << MCCR4_PRETOACT_SHIFT) | (CFG_ACTTOPRE << MCCR4_ACTTOPRE_SHIFT) | \ + (CFG_REGISTERD_TYPE_BUFFER << 20) | \ + (((CFG_BSTOPRE & 0x00000300) >> 8) << MCCR4_BSTOPRE0TO1_SHIFT ) | \ + ((CFG_SDMODE_CAS_LAT << 4) | (CFG_SDMODE_WRAP << 3) | \ + (CFG_SDMODE_BURSTLEN) << MCCR4_SDMODE_SHIFT) | \ + (CFG_ACTTORW << MCCR4_ACTTORW_SHIFT) | \ + ((CFG_BSTOPRE & 0x0000000f) << MCCR4_BSTOPRE6TO9_SHIFT ) + .long MSAR1 + .long (((CFG_BANK0_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 0) | \ + (((CFG_BANK1_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 8) | \ + (((CFG_BANK2_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 16) | \ + (((CFG_BANK3_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 24) + .long EMSAR1 + .long (((CFG_BANK0_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 0) | \ + (((CFG_BANK1_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 8) | \ + (((CFG_BANK2_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 16) | \ + (((CFG_BANK3_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 24) + .long MSAR2 + .long (((CFG_BANK4_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 0) | \ + (((CFG_BANK5_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 8) | \ + (((CFG_BANK6_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 16) | \ + (((CFG_BANK7_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 24) + .long EMSAR2 + .long (((CFG_BANK4_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 0) | \ + (((CFG_BANK5_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 8) | \ + (((CFG_BANK6_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 16) | \ + (((CFG_BANK7_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 24) + .long MEAR1 + .long (((CFG_BANK0_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 0) | \ + (((CFG_BANK1_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 8) | \ + (((CFG_BANK2_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 16) | \ + (((CFG_BANK3_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 24) + .long EMEAR1 + .long (((CFG_BANK0_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 0) | \ + (((CFG_BANK1_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 8) | \ + (((CFG_BANK2_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 16) | \ + (((CFG_BANK3_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 24) + .long MEAR2 + .long (((CFG_BANK4_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 0) | \ + (((CFG_BANK5_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 8) | \ + (((CFG_BANK6_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 16) | \ + (((CFG_BANK7_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 24) + .long EMEAR2 + .long (((CFG_BANK4_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 0) | \ + (((CFG_BANK5_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 8) | \ + (((CFG_BANK6_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 16) | \ + (((CFG_BANK7_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 24) + .long 0 + + + /* + * Early CPU initialization. Set up memory controller, so we can access any RAM at all. This + * must be done in assembly, since we have no stack at this point. + */ + .global early_init_f +early_init_f: + mflr r10 + + /* basic memory controller configuration */ + lis r3, CONFIG_ADDR_HIGH + lis r4, CONFIG_DATA_HIGH + bl lab +lab: mflr r5 + lwzu r0, tbl - lab(r5) +loop: lwz r1, 4(r5) + stwbrx r0, 0, r3 + eieio + stwbrx r1, 0, r4 + eieio + lwzu r0, 8(r5) + cmpli cr0, 0, r0, 0 + bne cr0, loop + + /* set bank enable bits */ + lis r0, MBER@h + ori r0, 0, MBER@l + li r1, CFG_BANK_ENABLE + stwbrx r0, 0, r3 + eieio + stb r1, 0(r4) + eieio + + /* delay loop */ + lis r0, 0x0003 + mtctr r0 +delay: bdnz delay + + /* enable memory controller */ + lis r0, MCCR1@h + ori r0, 0, MCCR1@l + stwbrx r0, 0, r3 + eieio + lwbrx r0, 0, r4 + oris r0, 0, MCCR1_MEMGO@h + stwbrx r0, 0, r4 + eieio + + /* set up stack pointer */ + lis r1, CFG_INIT_SP_OFFSET@h + ori r1, r1, CFG_INIT_SP_OFFSET@l + + mtlr r10 + blr |