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/*
* SPDX-License-Identifier: GPL-2.0 IBM-pibs
*/
/*-----------------------------------------------------------------------------
* 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
* Bank 2 - not used
* Bank 3 - not used
* Bank 4 - not used
* Bank 5 - not used
* Bank 6 - used to switch on the 12V for the Multipurpose socket
* Bank 7 - Config Register
*-----------------------------------------------------------------------------*/
#include <configs/PIP405.h>
#include <ppc_asm.tmpl>
#include <ppc_defs.h>
#include <asm/cache.h>
#include <asm/mmu.h>
#include <asm/ppc4xx.h>
#include "pip405.h"
.globl ext_bus_cntlr_init
ext_bus_cntlr_init:
mflr r4 /* save link register */
mfdcr r3,CPC0_PSR /* 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 EBC0_CFGADDR,r4
mfdcr r4,EBC0_CFGDATA
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,PB1AP
mtdcr EBC0_CFGADDR,r4
addis r4,0,(FLASH_AP_B)@h
ori r4,r4,(FLASH_AP_B)@l
mtdcr EBC0_CFGDATA,r4
addi r4,0,PB0CR
mtdcr EBC0_CFGADDR,r4
/* BS=0x010(4MB),BU=0x3(R/W), */
addis r4,0,(FLASH_CR_B)@h
ori r4,r4,(FLASH_CR_B)@l
mtdcr EBC0_CFGDATA,r4
b 1f
0:
/* 8Bit boot mode: */
/*-----------------------------------------------------------------------
* Memory Bank 0 Multi Purpose Socket initialization
*----------------------------------------------------------------------- */
/* 0x7F8FFE80 slowest boot */
addi r4,0,PB1AP
mtdcr EBC0_CFGADDR,r4
addis r4,0,(MPS_AP_B)@h
ori r4,r4,(MPS_AP_B)@l
mtdcr EBC0_CFGDATA,r4
addi r4,0,PB0CR
mtdcr EBC0_CFGADDR,r4
/* BS=0x010(4MB),BU=0x3(R/W), */
addis r4,0,(MPS_CR_B)@h
ori r4,r4,(MPS_CR_B)@l
mtdcr EBC0_CFGDATA,r4
1:
/*-----------------------------------------------------------------------
* Memory Bank 2-3-4-5-6 (not used) initialization
*-----------------------------------------------------------------------*/
addi r4,0,PB1CR
mtdcr EBC0_CFGADDR,r4
addis r4,0,0x0000
ori r4,r4,0x0000
mtdcr EBC0_CFGDATA,r4
addi r4,0,PB2CR
mtdcr EBC0_CFGADDR,r4
addis r4,0,0x0000
ori r4,r4,0x0000
mtdcr EBC0_CFGDATA,r4
addi r4,0,PB3CR
mtdcr EBC0_CFGADDR,r4
addis r4,0,0x0000
ori r4,r4,0x0000
mtdcr EBC0_CFGDATA,r4
addi r4,0,PB4CR
mtdcr EBC0_CFGADDR,r4
addis r4,0,0x0000
ori r4,r4,0x0000
mtdcr EBC0_CFGDATA,r4
addi r4,0,PB5CR
mtdcr EBC0_CFGADDR,r4
addis r4,0,0x0000
ori r4,r4,0x0000
mtdcr EBC0_CFGDATA,r4
addi r4,0,PB6CR
mtdcr EBC0_CFGADDR,r4
addis r4,0,0x0000
ori r4,r4,0x0000
mtdcr EBC0_CFGDATA,r4
addi r4,0,PB7CR
mtdcr EBC0_CFGADDR,r4
addis r4,0,0x0000
ori r4,r4,0x0000
mtdcr EBC0_CFGDATA,r4
nop /* pass2 DCR errata #8 */
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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