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Diffstat (limited to 'board/mpl/mip405/init.S')
| -rw-r--r-- | board/mpl/mip405/init.S | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/board/mpl/mip405/init.S b/board/mpl/mip405/init.S new file mode 100644 index 0000000..f0a500a --- /dev/null +++ b/board/mpl/mip405/init.S @@ -0,0 +1,202 @@ +/*------------------------------------------------------------------------------+ + * + * This source code has been made available to you by IBM on an AS-IS + * basis. Anyone receiving this source is licensed under IBM + * copyrights to use it in any way he or she deems fit, including + * copying it, modifying it, compiling it, and redistributing it either + * with or without modifications. No license under IBM patents or + * patent applications is to be implied by the copyright license. + * + * Any user of this software should understand that IBM cannot provide + * technical support for this software and will not be responsible for + * any consequences resulting from the use of this software. + * + * Any person who transfers this source code or any derivative work + * must include the IBM copyright notice, this paragraph, and the + * preceding two paragraphs in the transferred software. + * + * COPYRIGHT I B M CORPORATION 1995 + * LICENSED MATERIAL - PROGRAM PROPERTY OF I B M + *-------------------------------------------------------------------------------*/ + +/*----------------------------------------------------------------------------- + * Function: ext_bus_cntlr_init + * Description: Initializes the External Bus Controller for the external + * peripherals. IMPORTANT: For pass1 this code must run from + * cache since you can not reliably change a peripheral banks + * timing register (pbxap) while running code from that bank. + * For ex., since we are running from ROM on bank 0, we can NOT + * execute the code that modifies bank 0 timings from ROM, so + * we run it from cache. + * Bank 0 - Flash or Multi Purpose Socket + * Bank 1 - Multi Purpose Socket or Flash (set in C-Code) + * Bank 2 - UART 1 (set in C-Code) + * Bank 3 - UART 2 (set in C-Code) + * Bank 4 - not used + * Bank 5 - not used + * Bank 6 - not used + * Bank 7 - PLD Register + *-----------------------------------------------------------------------------*/ +#include <ppc4xx.h> + +#define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */ + +#include <configs/MIP405.h> +#include <ppc_asm.tmpl> +#include <ppc_defs.h> + +#include <asm/cache.h> +#include <asm/mmu.h> +#include "mip405.h" + + + .globl ext_bus_cntlr_init +ext_bus_cntlr_init: + mflr r4 /* save link register */ + bl ..getAddr +..getAddr: + mflr r3 /* get address of ..getAddr */ + mtlr r4 /* restore link register */ + addi r4,0,14 /* set ctr to 14; used to prefetch */ + mtctr r4 /* 14 cache lines to fit this function */ + /* in cache (gives us 8x14=112 instrctns) */ +..ebcloop: + icbt r0,r3 /* prefetch cache line for addr in r3 */ + addi r3,r3,32 /* move to next cache line */ + bdnz ..ebcloop /* continue for 14 cache lines */ + + /*------------------------------------------------------------------- + * Delay to ensure all accesses to ROM are complete before changing + * bank 0 timings. + *------------------------------------------------------------------- */ + addis r3,0,0x0 + ori r3,r3,0xA000 + mtctr r3 +..spinlp: + bdnz ..spinlp /* spin loop */ + + /*----------------------------------------------------------------------- + * decide boot up mode + *----------------------------------------------------------------------- */ + addi r4,0,pb0cr + mtdcr ebccfga,r4 + mfdcr r4,ebccfgd + + andi. r0, r4, 0x2000 /* mask out irrelevant bits */ + beq 0f /* jump if 8 bit bus width */ + + /* setup 16 bit things (Flash Boot) + *----------------------------------------------------------------------- + * Memory Bank 0 (16 Bit Flash) initialization + *---------------------------------------------------------------------- */ + + addi r4,0,pb0ap + mtdcr ebccfga,r4 +/* addis r4,0,0xFF8F */ +/* ori r4,r4,0xFE80 */ +/* addis r4,0,0x9B01 */ +/* ori r4,r4,0x5480 */ + addis r4,0,(FLASH_AP_B)@h + ori r4,r4,(FLASH_AP_B)@l + mtdcr ebccfgd,r4 + + addi r4,0,pb0cr + mtdcr ebccfga,r4 + /* BS=0x010(4MB),BU=0x3(R/W), */ +/* addis r4,0,((FLASH_BASE0_PRELIM & 0xFFF00000) | 0x00050000)@h */ +/* ori r4,r4,0xA000 / * BW=0x01(16 bits) */ + addis r4,0,(FLASH_CR_B)@h + ori r4,r4,(FLASH_CR_B)@l + mtdcr ebccfgd,r4 + b 1f + +0: + + /* 8Bit boot mode: */ + /*----------------------------------------------------------------------- + * Memory Bank 0 Multi Purpose Socket initialization + *----------------------------------------------------------------------- */ + /* 0x7F8FFE80 slowest boot */ + addi r4,0,pb0ap + mtdcr ebccfga,r4 +#if 0 + addis r4,0,0x9B01 + ori r4,r4,0x5480 +#else + addis r4,0,(MPS_AP_B)@h + ori r4,r4,(MPS_AP_B)@l +#endif + mtdcr ebccfgd,r4 + + addi r4,0,pb0cr + mtdcr ebccfga,r4 + /* BS=0x010(4MB),BU=0x3(R/W), */ +/* addis r4,0,((FLASH_BASE0_PRELIM & 0xFFF00000) | 0x00050000)@h */ +/* ori r4,r4,0x8000 / * BW=0x0( 8 bits) */ + + addis r4,0,(MPS_CR_B)@h + ori r4,r4,(MPS_CR_B)@l + + mtdcr ebccfgd,r4 + + +1: + /*----------------------------------------------------------------------- + * Memory Bank 2-3-4-5-6 (not used) initialization + *-----------------------------------------------------------------------*/ + addi r4,0,pb1cr + mtdcr ebccfga,r4 + addis r4,0,0x0000 + ori r4,r4,0x0000 + mtdcr ebccfgd,r4 + + addi r4,0,pb2cr + mtdcr ebccfga,r4 + addis r4,0,0x0000 + ori r4,r4,0x0000 + mtdcr ebccfgd,r4 + + addi r4,0,pb3cr + mtdcr ebccfga,r4 + addis r4,0,0x0000 + ori r4,r4,0x0000 + mtdcr ebccfgd,r4 + + addi r4,0,pb4cr + mtdcr ebccfga,r4 + addis r4,0,0x0000 + ori r4,r4,0x0000 + mtdcr ebccfgd,r4 + + addi r4,0,pb5cr + mtdcr ebccfga,r4 + addis r4,0,0x0000 + ori r4,r4,0x0000 + mtdcr ebccfgd,r4 + + addi r4,0,pb6cr + mtdcr ebccfga,r4 + addis r4,0,0x0000 + ori r4,r4,0x0000 + mtdcr ebccfgd,r4 + + addi r4,0,pb7cr + mtdcr ebccfga,r4 + addis r4,0,0x0000 + ori r4,r4,0x0000 + mtdcr ebccfgd,r4 + nop /* pass2 DCR errata #8 */ + blr + +/*----------------------------------------------------------------------------- + * Function: sdram_init + * Description: Configures the internal SRAM memory. and setup the + * Stackpointer in it. + *----------------------------------------------------------------------------- */ + .globl sdram_init + +sdram_init: + + + blr + |