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/*------------------------------------------------------------------------------+
*
* 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 */
mfdcr r3,strap /* get strapping reg */
andi. r0, r3, PSR_ROM_LOC /* mask out irrelevant bits */
bnelr /* jump back if PCI boot */
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
*-----------------------------------------------------------------------
* Memory Bank 0 (16 Bit Flash) initialization
*---------------------------------------------------------------------- */
addi r4,0,pb0ap
mtdcr ebccfga,r4
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_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
addis r4,0,(MPS_AP_B)@h
ori r4,r4,(MPS_AP_B)@l
mtdcr ebccfgd,r4
addi r4,0,pb0cr
mtdcr ebccfga,r4
/* BS=0x010(4MB),BU=0x3(R/W), */
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
#if defined(CONFIG_BOOT_PCI)
.section .bootpg,"ax"
.globl _start_pci
/*******************************************
*/
_start_pci:
/* first handle errata #68 / PCI_18 */
iccci r0, r0 /* invalidate I-cache */
lis r31, 0
mticcr r31 /* ICCR = 0 (all uncachable) */
isync
mfccr0 r28 /* set CCR0[24] = 1 */
ori r28, r28, 0x0080
mtccr0 r28
/* setup PMM0MA (0xEF400004) and PMM0PCIHA (0xEF40000C) */
lis r28, 0xEF40
addi r28, r28, 0x0004
stw r31, 0x0C(r28) /* clear PMM0PCIHA */
lis r29, 0xFFF8 /* open 512 kByte */
addi r29, r29, 0x0001/* and enable this region */
stwbrx r29, r0, r28 /* write PMM0MA */
lis r28, 0xEEC0 /* address of PCIC0_CFGADDR */
addi r29, r28, 4 /* add 4 to r29 -> PCIC0_CFGDATA */
lis r31, 0x8000 /* set en bit bus 0 */
ori r31, r31, 0x304C/* device 6 func 0 reg 4C (XBCS register) */
stwbrx r31, r0, r28 /* write it */
lwbrx r31, r0, r29 /* load XBCS register */
oris r31, r31, 0x02C4/* clear BIOSCS WPE, set lower, extended and 1M extended BIOS enable */
stwbrx r31, r0, r29 /* write back XBCS register */
nop
nop
b _start /* normal start */
#endif
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