356 lines
12 KiB
ArmAsm
356 lines
12 KiB
ArmAsm
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/*------------------------------------------------------------------------------+ */
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/* */
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/* This source code has been made available to you by IBM on an AS-IS */
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/* basis. Anyone receiving this source is licensed under IBM */
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/* copyrights to use it in any way he or she deems fit, including */
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/* copying it, modifying it, compiling it, and redistributing it either */
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/* with or without modifications. No license under IBM patents or */
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/* patent applications is to be implied by the copyright license. */
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/* */
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/* Any user of this software should understand that IBM cannot provide */
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/* technical support for this software and will not be responsible for */
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/* any consequences resulting from the use of this software. */
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/* */
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/* Any person who transfers this source code or any derivative work */
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/* must include the IBM copyright notice, this paragraph, and the */
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/* preceding two paragraphs in the transferred software. */
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/* */
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/* COPYRIGHT I B M CORPORATION 1995 */
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/* LICENSED MATERIAL - PROGRAM PROPERTY OF I B M */
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/*------------------------------------------------------------------------------- */
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/*----------------------------------------------------------------------------- */
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/* Function: ext_bus_cntlr_init */
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/* Description: Initializes the External Bus Controller for the external */
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/* peripherals. IMPORTANT: For pass1 this code must run from */
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/* cache since you can not reliably change a peripheral banks */
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/* timing register (pbxap) while running code from that bank. */
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/* For ex., since we are running from ROM on bank 0, we can NOT */
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/* execute the code that modifies bank 0 timings from ROM, so */
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/* we run it from cache. */
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/* */
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/*----------------------------------------------------------------------------- */
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#include <config.h>
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#include <ppc4xx.h>
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#define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
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#include <ppc_asm.tmpl>
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#include <ppc_defs.h>
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#include <asm/cache.h>
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#include <asm/mmu.h>
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.globl ext_bus_cntlr_init
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ext_bus_cntlr_init:
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mflr r4 /* save link register */
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bl ..getAddr
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..getAddr:
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mflr r3 /* get address of ..getAddr */
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mtlr r4 /* restore link register */
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addi r4,0,14 /* set ctr to 10; used to prefetch */
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mtctr r4 /* 10 cache lines to fit this function */
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/* in cache (gives us 8x10=80 instrctns) */
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..ebcloop:
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icbt r0,r3 /* prefetch cache line for addr in r3 */
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addi r3,r3,32 /* move to next cache line */
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bdnz ..ebcloop /* continue for 10 cache lines */
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/*------------------------------------------------------------------- */
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/* Delay to ensure all accesses to ROM are complete before changing */
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/* bank 0 timings. 200usec should be enough. */
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/* 200,000,000 (cycles/sec) X .000200 (sec) = 0x9C40 cycles */
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/*------------------------------------------------------------------- */
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addis r3,0,0x0
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ori r3,r3,0xA000 /* ensure 200usec have passed since reset */
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mtctr r3
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..spinlp:
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bdnz ..spinlp /* spin loop */
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/*----------------------------------------------------------------------- */
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/* Memory Bank 0 (Flash) initialization (from openbios) */
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/*----------------------------------------------------------------------- */
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addi r4,0,pb0ap
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mtdcr ebccfga,r4
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addis r4,0,CS0_AP@h
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ori r4,r4,CS0_AP@l
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mtdcr ebccfgd,r4
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addi r4,0,pb0cr
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mtdcr ebccfga,r4
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addis r4,0,CS0_CR@h
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ori r4,r4,CS0_CR@l
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mtdcr ebccfgd,r4
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/*----------------------------------------------------------------------- */
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/* Memory Bank 1 (NVRAM/RTC) initialization */
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/*----------------------------------------------------------------------- */
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addi r4,0,pb1ap
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mtdcr ebccfga,r4
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addis r4,0,CS1_AP@h
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ori r4,r4,CS1_AP@l
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mtdcr ebccfgd,r4
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addi r4,0,pb1cr
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mtdcr ebccfga,r4
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addis r4,0,CS1_CR@h
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ori r4,r4,CS1_CR@l
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mtdcr ebccfgd,r4
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/*----------------------------------------------------------------------- */
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/* Memory Bank 2 (A/D converter) initialization */
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/*----------------------------------------------------------------------- */
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addi r4,0,pb2ap
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mtdcr ebccfga,r4
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addis r4,0,CS2_AP@h
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ori r4,r4,CS2_AP@l
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mtdcr ebccfgd,r4
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addi r4,0,pb2cr
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mtdcr ebccfga,r4
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addis r4,0,CS2_CR@h
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ori r4,r4,CS2_CR@l
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mtdcr ebccfgd,r4
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/*----------------------------------------------------------------------- */
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/* Memory Bank 3 (Ethernet PHY Reset) initialization */
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/*----------------------------------------------------------------------- */
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addi r4,0,pb3ap
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mtdcr ebccfga,r4
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addis r4,0,CS3_AP@h
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ori r4,r4,CS3_AP@l
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mtdcr ebccfgd,r4
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addi r4,0,pb3cr
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mtdcr ebccfga,r4
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addis r4,0,CS3_CR@h
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ori r4,r4,CS3_CR@l
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mtdcr ebccfgd,r4
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/*----------------------------------------------------------------------- */
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/* Memory Bank 4 (PC-MIP PRSNT1#) initialization */
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/*----------------------------------------------------------------------- */
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addi r4,0,pb4ap
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mtdcr ebccfga,r4
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addis r4,0,CS4_AP@h
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ori r4,r4,CS4_AP@l
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mtdcr ebccfgd,r4
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addi r4,0,pb4cr
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mtdcr ebccfga,r4
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addis r4,0,CS4_CR@h
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ori r4,r4,CS4_CR@l
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mtdcr ebccfgd,r4
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/*----------------------------------------------------------------------- */
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/* Memory Bank 5 (PC-MIP PRSNT2#) initialization */
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/*----------------------------------------------------------------------- */
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addi r4,0,pb5ap
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mtdcr ebccfga,r4
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addis r4,0,CS5_AP@h
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ori r4,r4,CS5_AP@l
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mtdcr ebccfgd,r4
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addi r4,0,pb5cr
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mtdcr ebccfga,r4
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addis r4,0,CS5_CR@h
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ori r4,r4,CS5_CR@l
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mtdcr ebccfgd,r4
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/*----------------------------------------------------------------------- */
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/* Memory Bank 6 (CPU LED0) initialization */
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/*----------------------------------------------------------------------- */
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addi r4,0,pb6ap
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mtdcr ebccfga,r4
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addis r4,0,CS6_AP@h
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ori r4,r4,CS6_AP@l
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mtdcr ebccfgd,r4
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addi r4,0,pb6cr
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mtdcr ebccfga,r4
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addis r4,0,CS6_CR@h
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ori r4,r4,CS5_CR@l
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mtdcr ebccfgd,r4
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/*----------------------------------------------------------------------- */
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/* Memory Bank 7 (CPU LED1) initialization */
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/*----------------------------------------------------------------------- */
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addi r4,0,pb7ap
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mtdcr ebccfga,r4
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addis r4,0,CS7_AP@h
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ori r4,r4,CS7_AP@l
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mtdcr ebccfgd,r4
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addi r4,0,pb7cr
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mtdcr ebccfga,r4
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addis r4,0,CS7_CR@h
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ori r4,r4,CS7_CR@l
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mtdcr ebccfgd,r4
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/* addis r4,r0,FPGA_BRDC@h */
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/* ori r4,r4,FPGA_BRDC@l */
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/* lbz r3,0(r4) /###*get FPGA board control reg */
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/* eieio */
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/* ori r3,r3,0x01 /###*set UART1 control to select CTS/RTS */
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/* stb r3,0(r4) */
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nop /* pass2 DCR errata #8 */
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blr
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/*----------------------------------------------------------------------------- */
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/* Function: sdram_init */
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/* Description: Configures SDRAM memory banks on ERIC. */
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/* We do manually init our SDRAM. */
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/* If we have two SDRAM banks, simply undef SINGLE_BANK (ROLF :-) */
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/* It is assumed that a 32MB 12x8(2) SDRAM is used. */
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/*----------------------------------------------------------------------------- */
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.globl sdram_init
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sdram_init:
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mflr r31
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#ifdef CFG_SDRAM_MANUALLY
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/*------------------------------------------------------------------- */
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/* Set MB0CF for bank 0. (0-32MB) Address Mode 4 since 12x8(2) */
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/*------------------------------------------------------------------- */
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addi r4,0,mem_mb0cf
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mtdcr memcfga,r4
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addis r4,0,MB0CF@h
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ori r4,r4,MB0CF@l
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mtdcr memcfgd,r4
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/*------------------------------------------------------------------- */
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/* Set MB1CF for bank 1. (32MB-64MB) Address Mode 4 since 12x8(2) */
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/*------------------------------------------------------------------- */
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addi r4,0,mem_mb1cf
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mtdcr memcfga,r4
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addis r4,0,MB1CF@h
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ori r4,r4,MB1CF@l
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mtdcr memcfgd,r4
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/*------------------------------------------------------------------- */
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/* Set MB2CF for bank 2. off */
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/*------------------------------------------------------------------- */
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addi r4,0,mem_mb2cf
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mtdcr memcfga,r4
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addis r4,0,MB2CF@h
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ori r4,r4,MB2CF@l
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mtdcr memcfgd,r4
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/*------------------------------------------------------------------- */
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/* Set MB3CF for bank 3. off */
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/*------------------------------------------------------------------- */
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addi r4,0,mem_mb3cf
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mtdcr memcfga,r4
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addis r4,0,MB3CF@h
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ori r4,r4,MB3CF@l
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mtdcr memcfgd,r4
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/*------------------------------------------------------------------- */
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/* Set the SDRAM Timing reg, SDTR1 and the refresh timer reg, RTR. */
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/* To set the appropriate timings, we need to know the SDRAM speed. */
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/* We can use the PLB speed since the SDRAM speed is the same as */
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/* the PLB speed. The PLB speed is the FBK divider times the */
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/* 405GP reference clock, which on the Walnut board is 33Mhz. */
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/* Thus, if FBK div is 2, SDRAM is 66Mhz; if FBK div is 3, SDRAM is */
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/* 100Mhz; if FBK is 3, SDRAM is 133Mhz. */
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/* NOTE: The Walnut board supports SDRAM speeds of 66Mhz, 100Mhz, and */
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/* maybe 133Mhz. */
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/*------------------------------------------------------------------- */
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mfdcr r5,strap /* determine FBK divider */
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/* via STRAP reg to calc PLB speed. */
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/* SDRAM speed is the same as the PLB */
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/* speed. */
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rlwinm r4,r5,4,0x3 /* get FBK divide bits */
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..chk_66:
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cmpi %cr0,0,r4,0x1
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bne ..chk_100
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addis r6,0,SDTR_66@h /* SDTR1 value for 66Mhz */
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ori r6,r6,SDTR_66@l
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addis r7,0,RTR_66 /* RTR value for 66Mhz */
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b ..sdram_ok
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..chk_100:
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cmpi %cr0,0,r4,0x2
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bne ..chk_133
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addis r6,0,SDTR_100@h /* SDTR1 value for 100Mhz */
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ori r6,r6,SDTR_100@l
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addis r7,0,RTR_100 /* RTR value for 100Mhz */
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b ..sdram_ok
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..chk_133:
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addis r6,0,0x0107 /* SDTR1 value for 133Mhz */
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ori r6,r6,0x4015
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addis r7,0,0x07F0 /* RTR value for 133Mhz */
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..sdram_ok:
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/*------------------------------------------------------------------- */
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/* Set SDTR1 */
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/*------------------------------------------------------------------- */
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addi r4,0,mem_sdtr1
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mtdcr memcfga,r4
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mtdcr memcfgd,r6
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/*------------------------------------------------------------------- */
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/* Set RTR */
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/*------------------------------------------------------------------- */
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addi r4,0,mem_rtr
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mtdcr memcfga,r4
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mtdcr memcfgd,r7
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/*------------------------------------------------------------------- */
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/* Delay to ensure 200usec have elapsed since reset. Assume worst */
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/* case that the core is running 200Mhz: */
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/* 200,000,000 (cycles/sec) X .000200 (sec) = 0x9C40 cycles */
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/*------------------------------------------------------------------- */
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addis r3,0,0x0000
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ori r3,r3,0xA000 /* ensure 200usec have passed since reset */
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mtctr r3
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..spinlp2:
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bdnz ..spinlp2 /* spin loop */
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/*------------------------------------------------------------------- */
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/* Set memory controller options reg, MCOPT1. */
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/* Set DC_EN to '1' and BRD_PRF to '01' for 16 byte PLB Burst */
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/* read/prefetch. */
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/*------------------------------------------------------------------- */
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addi r4,0,mem_mcopt1
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mtdcr memcfga,r4
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addis r4,0,0x8080 /* set DC_EN=1 */
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ori r4,r4,0x0000
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mtdcr memcfgd,r4
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/*------------------------------------------------------------------- */
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/* Delay to ensure 10msec have elapsed since reset. This is */
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/* required for the MPC952 to stabalize. Assume worst */
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/* case that the core is running 200Mhz: */
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/* 200,000,000 (cycles/sec) X .010 (sec) = 0x1E8480 cycles */
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/* This delay should occur before accessing SDRAM. */
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/*------------------------------------------------------------------- */
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addis r3,0,0x001E
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ori r3,r3,0x8480 /* ensure 10msec have passed since reset */
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mtctr r3
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..spinlp3:
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bdnz ..spinlp3 /* spin loop */
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#else
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/*fixme: do SDRAM Autoconfig from EEPROM here */
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#endif
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mtlr r31 /* restore lr */
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blr
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