213 lines
7.1 KiB
ArmAsm
213 lines
7.1 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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#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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#define LI32(reg,val) \
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addis reg,0,val@h;\
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ori reg,reg,val@l
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#define WDCR_EBC(reg,val) \
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addi r4,0,reg;\
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mtdcr ebccfga,r4;\
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addis r4,0,val@h;\
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ori r4,r4,val@l;\
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mtdcr ebccfgd,r4
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#define WDCR_SDRAM(reg,val) \
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addi r4,0,reg;\
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mtdcr memcfga,r4;\
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addis r4,0,val@h;\
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ori r4,r4,val@l;\
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mtdcr memcfgd,r4
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/******************************************************************************
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* Function: ext_bus_cntlr_init
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*
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* Description: Configures EBC Controller and a few basic chip selects.
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*
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* CS0 is setup to get the Boot Flash out of the addresss range
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* so that we may setup a stack. CS7 is setup so that we can
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* access and reset the hardware watchdog.
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*
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* 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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* Notes: Does NOT use the stack.
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*****************************************************************************/
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.section ".text"
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.align 2
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.globl ext_bus_cntlr_init
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.type ext_bus_cntlr_init, @function
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ext_bus_cntlr_init:
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mflr r0
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/********************************************************************
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* Prefetch entire ext_bus_cntrl_init function into the icache.
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* This is necessary because we are going to change the same CS we
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* are executing from. Otherwise a CPU lockup may occur.
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*******************************************************************/
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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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/* Calculate number of cache lines for this function */
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addi r4, 0, (((.Lfe0 - ..getAddr) / CFG_CACHELINE_SIZE) + 2)
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mtctr r4
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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, CFG_CACHELINE_SIZE /* move to next cache line */
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bdnz ..ebcloop /* continue for $CTR 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 /* wait 200us from 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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* SETUP CPC0_CR0
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*******************************************************************/
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LI32(r4, 0x00c01030)
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mtdcr cntrl0, r4
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/********************************************************************
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* Setup CPC0_CR1: Change PCIINT signal to PerWE
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*******************************************************************/
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mfdcr r4, cntrl1
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ori r4, r4, 0x4000
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mtdcr cntrl1, r4
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/********************************************************************
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* Setup External Bus Controller (EBC).
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*******************************************************************/
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WDCR_EBC(epcr, 0xd84c0000)
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/********************************************************************
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* Memory Bank 0 (Intel 28F640J3 Flash) initialization
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*******************************************************************/
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/*WDCR_EBC(pb0ap, 0x03055200)*/
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/*WDCR_EBC(pb0ap, 0x04055200)*/
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WDCR_EBC(pb0ap, 0x08055200)
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WDCR_EBC(pb0cr, 0xff87a000)
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/********************************************************************
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* Memory Bank 3 (Xilinx XC95144 CPLD) initialization
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*******************************************************************/
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/*WDCR_EBC(pb3ap, 0x07869200)*/
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WDCR_EBC(pb3ap, 0x04055200)
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WDCR_EBC(pb3cr, 0xf081c000)
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/********************************************************************
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* Memory Bank 1,2,4-7 (Unused) initialization
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*******************************************************************/
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WDCR_EBC(pb1ap, 0)
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WDCR_EBC(pb1cr, 0)
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WDCR_EBC(pb2ap, 0)
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WDCR_EBC(pb2cr, 0)
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WDCR_EBC(pb4ap, 0)
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WDCR_EBC(pb4cr, 0)
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WDCR_EBC(pb5ap, 0)
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WDCR_EBC(pb5cr, 0)
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WDCR_EBC(pb6ap, 0)
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WDCR_EBC(pb6cr, 0)
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WDCR_EBC(pb7ap, 0)
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WDCR_EBC(pb7cr, 0)
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/* We are all done */
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mtlr r0 /* Restore link register */
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blr /* Return to calling function */
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.Lfe0: .size ext_bus_cntlr_init,.Lfe0-ext_bus_cntlr_init
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/* end ext_bus_cntlr_init() */
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/******************************************************************************
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* Function: sdram_init
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*
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* Description: Configures SDRAM memory banks.
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*
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* Notes: Does NOT use the stack.
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*****************************************************************************/
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.section ".text"
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.align 2
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.globl sdram_init
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.type sdram_init, @function
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sdram_init:
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/*
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* Disable memory controller to allow
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* values to be changed.
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*/
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WDCR_SDRAM(mem_mcopt1, 0x00000000)
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/*
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* Configure Memory Banks
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*/
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WDCR_SDRAM(mem_mb0cf, 0x00062001)
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WDCR_SDRAM(mem_mb1cf, 0x00000000)
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WDCR_SDRAM(mem_mb2cf, 0x00000000)
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WDCR_SDRAM(mem_mb3cf, 0x00000000)
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/*
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* Set up SDTR1 (SDRAM Timing Register)
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*/
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WDCR_SDRAM(mem_sdtr1, 0x00854009)
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/*
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* Set RTR (Refresh Timing Register)
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*/
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WDCR_SDRAM(mem_rtr, 0x10000000)
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/* WDCR_SDRAM(mem_rtr, 0x05f00000) */
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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 /* Wait >200us from 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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*******************************************************************/
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WDCR_SDRAM(mem_mcopt1,0x80800000)
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..sdri_done:
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blr /* Return to calling function */
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.Lfe1: .size sdram_init,.Lfe1-sdram_init
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/* end sdram_init() */
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