| /*------------------------------------------------------------------------------+ */ |
| /* */ |
| /* 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 and SRAM */ |
| /* Bank 1 - NVRAM/RTC */ |
| /* Bank 2 - Keyboard/Mouse controller */ |
| /* Bank 3 - IR controller */ |
| /* Bank 4 - not used */ |
| /* Bank 5 - not used */ |
| /* Bank 6 - not used */ |
| /* Bank 7 - FPGA registers */ |
| /*----------------------------------------------------------------------------- */ |
| #include <ppc4xx.h> |
| |
| #include <ppc_asm.tmpl> |
| #include <ppc_defs.h> |
| |
| #include <asm/cache.h> |
| #include <asm/mmu.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 10; used to prefetch */ |
| mtctr r4 /* 10 cache lines to fit this function */ |
| /* in cache (gives us 8x10=80 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 10 cache lines */ |
| |
| /*------------------------------------------------------------------- */ |
| /* Delay to ensure all accesses to ROM are complete before changing */ |
| /* bank 0 timings. 200usec should be enough. */ |
| /* 200,000,000 (cycles/sec) X .000200 (sec) = 0x9C40 cycles */ |
| /*------------------------------------------------------------------- */ |
| addis r3,0,0x0 |
| ori r3,r3,0xA000 /* ensure 200usec have passed since reset */ |
| mtctr r3 |
| ..spinlp: |
| bdnz ..spinlp /* spin loop */ |
| |
| /*----------------------------------------------------------------------- */ |
| /* Memory Bank 0 (Flash and SRAM) initialization */ |
| /*----------------------------------------------------------------------- */ |
| addi r4,0,pb0ap |
| mtdcr ebccfga,r4 |
| addis r4,0,0x9B01 |
| ori r4,r4,0x5480 |
| mtdcr ebccfgd,r4 |
| |
| addi r4,0,pb0cr |
| mtdcr ebccfga,r4 |
| addis r4,0,0xFFF1 /* BAS=0xFFF,BS=0x0(1MB),BU=0x3(R/W), */ |
| ori r4,r4,0x8000 /* BW=0x0( 8 bits) */ |
| mtdcr ebccfgd,r4 |
| |
| blr |
| |
| |
| /*----------------------------------------------------------------------------- */ |
| /* Function: sdram_init */ |
| /* Description: Dummy implementation here - done in C later */ |
| /*----------------------------------------------------------------------------- */ |
| .globl sdram_init |
| sdram_init: |
| blr |