init.S
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/*
* SPDX-License-Identifier: GPL-2.0 IBM-pibs
*/
#include <config.h>
#include <asm/ppc4xx.h>
#include <ppc_asm.tmpl>
#include <ppc_defs.h>
#include <asm/cache.h>
#include <asm/mmu.h>
#define LI32(reg,val) \
addis reg,0,val@h;\
ori reg,reg,val@l
#define WDCR_EBC(reg,val) \
addi r4,0,reg;\
mtdcr EBC0_CFGADDR,r4;\
addis r4,0,val@h;\
ori r4,r4,val@l;\
mtdcr EBC0_CFGDATA,r4
#define WDCR_SDRAM(reg,val) \
addi r4,0,reg;\
mtdcr SDRAM0_CFGADDR,r4;\
addis r4,0,val@h;\
ori r4,r4,val@l;\
mtdcr SDRAM0_CFGDATA,r4
/******************************************************************************
* Function: ext_bus_cntlr_init
*
* Description: Configures EBC Controller and a few basic chip selects.
*
* CS0 is setup to get the Boot Flash out of the addresss range
* so that we may setup a stack. CS7 is setup so that we can
* access and reset the hardware watchdog.
*
* 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.
*
* Notes: Does NOT use the stack.
*****************************************************************************/
.section ".text"
.align 2
.globl ext_bus_cntlr_init
.type ext_bus_cntlr_init, @function
ext_bus_cntlr_init:
mflr r0
/********************************************************************
* Prefetch entire ext_bus_cntrl_init function into the icache.
* This is necessary because we are going to change the same CS we
* are executing from. Otherwise a CPU lockup may occur.
*******************************************************************/
bl ..getAddr
..getAddr:
mflr r3 /* get address of ..getAddr */
/* Calculate number of cache lines for this function */
addi r4, 0, (((.Lfe0 - ..getAddr) / CONFIG_SYS_CACHELINE_SIZE) + 2)
mtctr r4
..ebcloop:
icbt r0, r3 /* prefetch cache line for addr in r3*/
addi r3, r3, CONFIG_SYS_CACHELINE_SIZE /* move to next cache line */
bdnz ..ebcloop /* continue for $CTR 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 /* wait 200us from reset */
mtctr r3
..spinlp:
bdnz ..spinlp /* spin loop */
/********************************************************************
* SETUP CPC0_CR0
*******************************************************************/
LI32(r4, 0x007000c0)
mtdcr CPC0_CR0, r4
/********************************************************************
* Setup CPC0_CR1: Change PCIINT signal to PerWE
*******************************************************************/
mfdcr r4, CPC0_CR1
ori r4, r4, 0x4000
mtdcr CPC0_CR1, r4
/********************************************************************
* Setup External Bus Controller (EBC).
*******************************************************************/
WDCR_EBC(EBC0_CFG, 0xd84c0000)
/********************************************************************
* Memory Bank 0 (Intel 28F128J3 Flash) initialization
*******************************************************************/
/*WDCR_EBC(PB1AP, 0x02869200)*/
WDCR_EBC(PB1AP, 0x07869200)
WDCR_EBC(PB0CR, 0xfe0bc000)
/********************************************************************
* Memory Bank 1 (Holtek HT6542B PS/2) initialization
*******************************************************************/
WDCR_EBC(PB1AP, 0x1f869200)
WDCR_EBC(PB1CR, 0xf0818000)
/********************************************************************
* Memory Bank 2 (Epson S1D13506) initialization
*******************************************************************/
WDCR_EBC(PB2AP, 0x05860300)
WDCR_EBC(PB2CR, 0xf045a000)
/********************************************************************
* Memory Bank 3 (Philips SJA1000 CAN Controllers) initialization
*******************************************************************/
WDCR_EBC(PB3AP, 0x0387d200)
WDCR_EBC(PB3CR, 0xf021c000)
/********************************************************************
* Memory Bank 4-7 (Unused) initialization
*******************************************************************/
WDCR_EBC(PB4AP, 0)
WDCR_EBC(PB4CR, 0)
WDCR_EBC(PB5AP, 0)
WDCR_EBC(PB5CR, 0)
WDCR_EBC(PB6AP, 0)
WDCR_EBC(PB6CR, 0)
WDCR_EBC(PB7AP, 0)
WDCR_EBC(PB7CR, 0)
/* We are all done */
mtlr r0 /* Restore link register */
blr /* Return to calling function */
.Lfe0: .size ext_bus_cntlr_init,.Lfe0-ext_bus_cntlr_init
/* end ext_bus_cntlr_init() */
/******************************************************************************
* Function: sdram_init
*
* Description: Configures SDRAM memory banks.
*
* Notes: Does NOT use the stack.
*****************************************************************************/
.section ".text"
.align 2
.globl sdram_init
.type sdram_init, @function
sdram_init:
/*
* Disable memory controller to allow
* values to be changed.
*/
WDCR_SDRAM(SDRAM0_CFG, 0x00000000)
/*
* Configure Memory Banks
*/
WDCR_SDRAM(SDRAM0_B0CR, 0x00084001)
WDCR_SDRAM(SDRAM0_B1CR, 0x00000000)
WDCR_SDRAM(SDRAM0_B2CR, 0x00000000)
WDCR_SDRAM(SDRAM0_B3CR, 0x00000000)
/*
* Set up SDTR1 (SDRAM Timing Register)
*/
WDCR_SDRAM(SDRAM0_TR, 0x00854009)
/*
* Set RTR (Refresh Timing Register)
*/
WDCR_SDRAM(SDRAM0_RTR, 0x10000000)
/* WDCR_SDRAM(SDRAM0_RTR, 0x05f00000) */
/********************************************************************
* Delay to ensure 200usec have elapsed since reset. Assume worst
* case that the core is running 200Mhz:
* 200,000,000 (cycles/sec) X .000200 (sec) = 0x9C40 cycles
*******************************************************************/
addis r3, 0, 0x0000
ori r3, r3, 0xA000 /* Wait >200us from reset */
mtctr r3
..spinlp2:
bdnz ..spinlp2 /* spin loop */
/********************************************************************
* Set memory controller options reg, MCOPT1.
*******************************************************************/
WDCR_SDRAM(SDRAM0_CFG,0x80800000)
..sdri_done:
blr /* Return to calling function */
.Lfe1: .size sdram_init,.Lfe1-sdram_init
/* end sdram_init() */