board/sc3/init.S - github/trini/u-boot - Gitiles

 /*
  * 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>

 /**
  * ext_bus_cntlr_init - 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 - Boot-Flash
  * Bank 1 - NAND-Flash
  * Bank 2 - ISA bus
  * Bank 3 - Second Flash
  * Bank 4 - USB controller
  */
 	.globl ext_bus_cntlr_init
 ext_bus_cntlr_init:
 /*
  * We need the current boot up configuration to set correct
  * timings into internal flash and external flash
  */
 		mfdcr r24,CPC0_PSR		/* xxxx xxxx xxxx xxx? ?xxx xxxx xxxx xxxx
 						   0 0 -> 8 bit external ROM
 						   0 1 -> 16 bit internal ROM */
 		addi r4,0,2
 		srw r24,r24,r4				/* shift right r24 two positions */
 		andi. r24,r24,0x06000
 /*
  * All calculations are based on 33MHz EBC clock.
  *
  * First, create a "very slow" timing (~250ns) with burst mode enabled
  * This is need for the external flash access
  */
 		lis r25,0x0800
 		/* 0000 1000 0xxx 0000 0000 0010 100x xxxx = 0x03800280 */
 		ori r25,r25,0x0280
 /*
  * Second, create a fast timing:
  * 90ns first cycle - 3 clock access
  * and 90ns burst cycle, plus 1 clock after the last access
  * This is used for the internal access
  */
 		lis r26,0x8900
 		/* 1000 1001 0xxx 0000 0000 0010 100x xxxx */
 		ori r26,r26,0x0280
 /*
  * We can't change settings on CS# if we currently use them.
  * -> load a few instructions into cache and run this code from cache
  */
 		mflr r4					/* save link register */
 		bl ..getAddr
 ..getAddr:
 		mflr r3					/* get address of ..getAddr */
 		mtlr r4					/* restore link register */
 		addi r4,0,14				/* set ctr to 10; used to prefetch */
 		mtctr r4				/* 10 cache lines to fit this function
 							in cache (gives us 8x10=80 instructions) */
 ..ebcloop:
 		icbt r0,r3				/* prefetch cache line for addr in r3 */
 		addi r3,r3,32				/* move to next cache line */
 		bdnz ..ebcloop				/* continue for 10 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
  */
 		lis r3,0x0
 		ori r3,r3,0xA000			/* ensure 200usec have passed since reset */
 		mtctr r3
 ..spinlp:
 		bdnz ..spinlp				/* spin loop */

 /*-----------------------------------------------------------------------
  * Memory Bank 0 (BOOT-ROM) initialization
  * 0xFFEF00000....0xFFFFFFF
  * We only have to change the timing. Mapping is ok by boot-strapping
  *----------------------------------------------------------------------- */

 		li r4,PB1AP				/* PB0AP=Peripheral Bank 0 Access Parameters */
 		mtdcr EBC0_CFGADDR,r4

 		mr r4,r26				/* assume internal fast flash is boot flash */
 		cmpwi r24,0x2000			/* assumption true? ... */
 		beq 1f					/* ...yes! */
 		mr r4,r25				/* ...no, use the slow variant */
 		mr r25,r26				/* use this for the other flash */
 1:
 		mtdcr EBC0_CFGDATA,r4			/* change timing now */

 		li r4,PB0CR				/* PB0CR=Peripheral Bank 0 Control Register */
 		mtdcr EBC0_CFGADDR,r4
 		mfdcr r4,EBC0_CFGDATA
 		lis r3,0x0001
 		ori r3,r3,0x8000			/* allow reads and writes */
 		or r4,r4,r3
 		mtdcr EBC0_CFGDATA,r4

 /*-----------------------------------------------------------------------
  * Memory Bank 3 (Second-Flash) initialization
  * 0xF0000000...0xF01FFFFF -> 2MB
  *----------------------------------------------------------------------- */

 		li r4,PB3AP				/* Peripheral Bank 1 Access Parameter */
 		mtdcr EBC0_CFGADDR,r4
 		mtdcr EBC0_CFGDATA,r2			/* change timing */

 		li r4,PB3CR				/* Peripheral Bank 1 Configuration Registers */
 		mtdcr EBC0_CFGADDR,r4

 		lis r4,0xF003
 		ori r4,r4,0x8000
 /*
  * Consider boot configuration
  */
 		xori r24,r24,0x2000			/* invert current bus width */
 		or r4,r4,r24
 		mtdcr EBC0_CFGDATA,r4

 /*-----------------------------------------------------------------------
  * Memory Bank 1 (NAND-Flash) initialization
  * 0x77D00000...0x77DFFFFF -> 1MB
  * - the write/read pulse to the NAND can be as short as 25ns, bus the cycle time is always 50ns
  * - the setup time is 0ns
  * - the hold time is 15ns
  * ->
  *   - TWT = 0
  *   - CSN = 0
  *   - OEN = 0
  *   - WBN = 0
  *   - WBF = 0
  *   - TH  = 1
  * ----> 2 clocks per cycle = 60ns cycle (30ns active, 30ns hold)
  *----------------------------------------------------------------------- */

 		li r4,PB1AP				/* Peripheral Bank 1 Access Parameter */
 		mtdcr EBC0_CFGADDR,r4

 		lis r4,0x0000
 		ori r4,r4,0x0200
 		mtdcr EBC0_CFGDATA,r4

 		li r4,PB1CR				/* Peripheral Bank 1 Configuration Registers */
 		mtdcr EBC0_CFGADDR,r4

 		lis r4,0x77D1
 		ori r4,r4,0x8000
 		mtdcr EBC0_CFGDATA,r4


 /* USB init (without acceleration) */
 #ifndef CONFIG_ISP1161_PRESENT
 		li r4,PB4AP				/* PB4AP=Peripheral Bank 4 Access Parameters */
 		mtdcr EBC0_CFGADDR,r4
 		lis r4,0x0180
 		ori r4,r4,0x5940
 		mtdcr EBC0_CFGDATA,r4
 #endif

 /*-----------------------------------------------------------------------
  * Memory Bank 2 (ISA Access) initialization (plus memory bank 6 and 7)
  * 0x78000000...0x7BFFFFFF -> 64 MB
  * Wir arbeiten bei 33 MHz -> 30ns
  *-----------------------------------------------------------------------

  A7 (ppc notation) or A24 (standard notation) decides about
  the type of access:
  A7/A24=0 -> memory cycle
  A7/ /A24=1 -> I/O cycle
 */
 		li r4,PB2AP				/* PB2AP=Peripheral Bank 2 Access Parameters */
 		mtdcr EBC0_CFGADDR,r4
 /*
  We emulate an ISA access

  1. Address active
  2. wait 0 EBC clocks -> CSN=0
  3. set CS#
  4. wait 0 EBC clock -> OEN/WBN=0
  5. set OE#/WE#
  6. wait 4 clocks (ca. 90ns) and for Ready signal
  7. hold for 4 clocks -> TH=4
 */

 #if 1
 /* faster access to isa-bus */
 		lis r4,0x0180
 		ori r4,r4,0x5940
 #else
 		lis r4,0x0100
 		ori r4,r4,0x0340
 #endif
 		mtdcr EBC0_CFGDATA,r4

 #ifdef IDE_USES_ISA_EMULATION
 		li r25,PB5AP				/* PB5AP=Peripheral Bank 5 Access Parameters */
 		mtdcr EBC0_CFGADDR,r25
 		mtdcr EBC0_CFGDATA,r4
 #endif

 		li r25,PB6AP				/* PB6AP=Peripheral Bank 6 Access Parameters */
 		mtdcr EBC0_CFGADDR,r25
 		mtdcr EBC0_CFGDATA,r4
 		li r25,PB7AP				/* PB7AP=Peripheral Bank 7 Access Parameters */
 		mtdcr EBC0_CFGADDR,r25
 		mtdcr EBC0_CFGDATA,r4

 		li r25,PB2CR				/* PB2CR=Peripheral Bank 2 Configuration Register */
 		mtdcr EBC0_CFGADDR,r25

 		lis r4,0x780B
 		ori r4,r4,0xA000
 		mtdcr EBC0_CFGDATA,r4
 /*
  * the other areas are only 1MiB in size
  */
 		lis r4,0x7401
 		ori r4,r4,0xA000

 		li r25,PB6CR				/* PB6CR=Peripheral Bank 6 Configuration Register */
 		mtdcr EBC0_CFGADDR,r25
 		lis r4,0x7401
 		ori r4,r4,0xA000
 		mtdcr EBC0_CFGDATA,r4

 		li r25,PB7CR				/* PB7CR=Peripheral Bank 7 Configuration Register */
 		mtdcr EBC0_CFGADDR,r25
 		lis r4,0x7411
 		ori r4,r4,0xA000
 		mtdcr EBC0_CFGDATA,r4

 #ifndef CONFIG_ISP1161_PRESENT
 		li r25,PB4CR				/* PB4CR=Peripheral Bank 4 Configuration Register */
 		mtdcr EBC0_CFGADDR,r25
 		lis r4,0x7421
 		ori r4,r4,0xA000
 		mtdcr EBC0_CFGDATA,r4
 #endif
 #ifdef IDE_USES_ISA_EMULATION
 		li r25,PB5CR				/* PB5CR=Peripheral Bank 5 Configuration Register */
 		mtdcr EBC0_CFGADDR,r25
 		lis r4,0x0000
 		ori r4,r4,0x0000
 		mtdcr EBC0_CFGDATA,r4
 #endif

 /*-----------------------------------------------------------------------
  * Memory bank 4: USB controller Philips ISP6111
  * 0x77C00000 ... 0x77CFFFFF
  *
  * The chip is connected to:
  * - CPU CS#4
  * - CPU IRQ#2
  * - CPU DMA 3
  *
  * Timing:
  * - command to first data: 300ns. Software must ensure this timing!
  * - Write pulse: 26ns
  * - Read pulse: 33ns
  * - read cycle time: 150ns
  * - write cycle time: 140ns
  *
  * Note: All calculations are based on 33MHz EBC clock. One '#' or '_' is 30ns
  *
  *			  |- 300ns --|
  *		  |---- 420ns ---|---- 420ns ---| cycle
  * CS ############:###____#######:###____#######
  * OE ############:####___#######:####___#######
  * WE ############:####__########:####__########
  *
  * ----> 2 clocks RD/WR pulses: 60ns
  * ----> CSN: 3 clock, 90ns
  * ----> OEN: 1 clocks (read cycle)
  * ----> WBN: 1 clocks (write cycle)
  * ----> WBE: 2 clocks
  * ----> TH: 7 clock, 210ns
  * ----> TWT: 7 clocks
  *----------------------------------------------------------------------- */

 #ifdef CONFIG_ISP1161_PRESENT

 		li r4,PB4AP				/* PB4AP=Peripheral Bank 4 Access Parameters */
 		mtdcr EBC0_CFGADDR,r4

 		lis r4,0x030D
 		ori r4,r4,0x5E80
 		mtdcr EBC0_CFGDATA,r4

 		li r4,PB4CR				/* PB2CR=Peripheral Bank 4 Configuration Register */
 		mtdcr EBC0_CFGADDR,r4

 		lis r4,0x77C1
 		ori r4,r4,0xA000
 		mtdcr EBC0_CFGDATA,r4

 #endif

 #ifndef IDE_USES_ISA_EMULATION

 /*-----------------------------------------------------------------------
  * Memory Bank 5 used for IDE access
  *
  * Timings for IDE Interface
  *
  * SETUP / LENGTH / HOLD - cycles valid for 33.3 MHz clk -> 30ns cycle time
  *  70		165		30		PIO-Mode 0, [ns]
  *   3		  6		 1		[Cycles] ----> AP=0x040C0200
  *  50		125		20	   PIO-Mode 1, [ns]
  *   2		  5		 1		[Cycles] ----> AP=0x03080200
  *  30		100		15	   PIO-Mode 2, [ns]
  *   1		  4		 1		[Cycles] ----> AP=0x02040200
  *  30		 80		10	   PIO-Mode 3, [ns]
  *   1		  3		 1		[Cycles] ----> AP=0x01840200
  *  25		 70		10	   PIO-Mode 4, [ns]
  *   1		  3		 1		[Cycles] ----> AP=0x01840200
  *
  *----------------------------------------------------------------------- */

 		li r4,PB5AP
 		mtdcr EBC0_CFGADDR,r4
 		lis r4,0x040C
 		ori r4,r4,0x0200
 		mtdcr EBC0_CFGDATA,r4

 		li r4,PB5CR			/* PB2CR=Peripheral Bank 2 Configuration Register */
 		mtdcr EBC0_CFGADDR,r4

 		lis r4,0x7A01
 		ori r4,r4,0xA000
 		mtdcr EBC0_CFGDATA,r4
 #endif
 /*
  * External Peripheral Control Register
  */
 		li r4,EBC0_CFG
 		mtdcr EBC0_CFGADDR,r4

 		lis r4,0xB84E
 		ori r4,r4,0xF000
 		mtdcr EBC0_CFGDATA,r4
 /*
  * drive POST code
  */
 		lis r4,0x7900
 		ori r4,r4,0x0080
 		li r3,0x0001
 		stb r3,0(r4)			/* 01 -> external bus controller is initialized */
 		nop				/* pass2 DCR errata #8 */
 		blr
	/*
	* 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>

	/**
	* ext_bus_cntlr_init - 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 - Boot-Flash
	* Bank 1 - NAND-Flash
	* Bank 2 - ISA bus
	* Bank 3 - Second Flash
	* Bank 4 - USB controller
	*/
	.globl ext_bus_cntlr_init
	ext_bus_cntlr_init:
	/*
	* We need the current boot up configuration to set correct
	* timings into internal flash and external flash
	*/
	mfdcr r24,CPC0_PSR /* xxxx xxxx xxxx xxx? ?xxx xxxx xxxx xxxx
	0 0 -> 8 bit external ROM
	0 1 -> 16 bit internal ROM */
	addi r4,0,2
	srw r24,r24,r4 /* shift right r24 two positions */
	andi. r24,r24,0x06000
	/*
	* All calculations are based on 33MHz EBC clock.
	*
	* First, create a "very slow" timing (~250ns) with burst mode enabled
	* This is need for the external flash access
	*/
	lis r25,0x0800
	/* 0000 1000 0xxx 0000 0000 0010 100x xxxx = 0x03800280 */
	ori r25,r25,0x0280
	/*
	* Second, create a fast timing:
	* 90ns first cycle - 3 clock access
	* and 90ns burst cycle, plus 1 clock after the last access
	* This is used for the internal access
	*/
	lis r26,0x8900
	/* 1000 1001 0xxx 0000 0000 0010 100x xxxx */
	ori r26,r26,0x0280
	/*
	* We can't change settings on CS# if we currently use them.
	* -> load a few instructions into cache and run this code from cache
	*/
	mflr r4 /* save link register */
	bl ..getAddr
	..getAddr:
	mflr r3 /* get address of ..getAddr */
	mtlr r4 /* restore link register */
	addi r4,0,14 /* set ctr to 10; used to prefetch */
	mtctr r4 /* 10 cache lines to fit this function
	in cache (gives us 8x10=80 instructions) */
	..ebcloop:
	icbt r0,r3 /* prefetch cache line for addr in r3 */
	addi r3,r3,32 /* move to next cache line */
	bdnz ..ebcloop /* continue for 10 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
	*/
	lis r3,0x0
	ori r3,r3,0xA000 /* ensure 200usec have passed since reset */
	mtctr r3
	..spinlp:
	bdnz ..spinlp /* spin loop */

	/*-----------------------------------------------------------------------
	* Memory Bank 0 (BOOT-ROM) initialization
	* 0xFFEF00000....0xFFFFFFF
	* We only have to change the timing. Mapping is ok by boot-strapping
	----------------------------------------------------------------------- /

	li r4,PB1AP /* PB0AP=Peripheral Bank 0 Access Parameters */
	mtdcr EBC0_CFGADDR,r4

	mr r4,r26 /* assume internal fast flash is boot flash */
	cmpwi r24,0x2000 /* assumption true? ... */
	beq 1f /* ...yes! */
	mr r4,r25 /* ...no, use the slow variant */
	mr r25,r26 /* use this for the other flash */
	1:
	mtdcr EBC0_CFGDATA,r4 /* change timing now */

	li r4,PB0CR /* PB0CR=Peripheral Bank 0 Control Register */
	mtdcr EBC0_CFGADDR,r4
	mfdcr r4,EBC0_CFGDATA
	lis r3,0x0001
	ori r3,r3,0x8000 /* allow reads and writes */
	or r4,r4,r3
	mtdcr EBC0_CFGDATA,r4

	/*-----------------------------------------------------------------------
	* Memory Bank 3 (Second-Flash) initialization
	* 0xF0000000...0xF01FFFFF -> 2MB
	----------------------------------------------------------------------- /

	li r4,PB3AP /* Peripheral Bank 1 Access Parameter */
	mtdcr EBC0_CFGADDR,r4
	mtdcr EBC0_CFGDATA,r2 /* change timing */

	li r4,PB3CR /* Peripheral Bank 1 Configuration Registers */
	mtdcr EBC0_CFGADDR,r4

	lis r4,0xF003
	ori r4,r4,0x8000
	/*
	* Consider boot configuration
	*/
	xori r24,r24,0x2000 /* invert current bus width */
	or r4,r4,r24
	mtdcr EBC0_CFGDATA,r4

	/*-----------------------------------------------------------------------
	* Memory Bank 1 (NAND-Flash) initialization
	* 0x77D00000...0x77DFFFFF -> 1MB
	* - the write/read pulse to the NAND can be as short as 25ns, bus the cycle time is always 50ns
	* - the setup time is 0ns
	* - the hold time is 15ns
	* ->
	* - TWT = 0
	* - CSN = 0
	* - OEN = 0
	* - WBN = 0
	* - WBF = 0
	* - TH = 1
	* ----> 2 clocks per cycle = 60ns cycle (30ns active, 30ns hold)
	----------------------------------------------------------------------- /

	li r4,PB1AP /* Peripheral Bank 1 Access Parameter */
	mtdcr EBC0_CFGADDR,r4

	lis r4,0x0000
	ori r4,r4,0x0200
	mtdcr EBC0_CFGDATA,r4

	li r4,PB1CR /* Peripheral Bank 1 Configuration Registers */
	mtdcr EBC0_CFGADDR,r4

	lis r4,0x77D1
	ori r4,r4,0x8000
	mtdcr EBC0_CFGDATA,r4


	/* USB init (without acceleration) */
	#ifndef CONFIG_ISP1161_PRESENT
	li r4,PB4AP /* PB4AP=Peripheral Bank 4 Access Parameters */
	mtdcr EBC0_CFGADDR,r4
	lis r4,0x0180
	ori r4,r4,0x5940
	mtdcr EBC0_CFGDATA,r4
	#endif

	/*-----------------------------------------------------------------------
	* Memory Bank 2 (ISA Access) initialization (plus memory bank 6 and 7)
	* 0x78000000...0x7BFFFFFF -> 64 MB
	* Wir arbeiten bei 33 MHz -> 30ns
	*-----------------------------------------------------------------------

	A7 (ppc notation) or A24 (standard notation) decides about
	the type of access:
	A7/A24=0 -> memory cycle
	A7/ /A24=1 -> I/O cycle
	*/
	li r4,PB2AP /* PB2AP=Peripheral Bank 2 Access Parameters */
	mtdcr EBC0_CFGADDR,r4
	/*
	We emulate an ISA access

	1. Address active
	2. wait 0 EBC clocks -> CSN=0
	3. set CS#
	4. wait 0 EBC clock -> OEN/WBN=0
	5. set OE#/WE#
	6. wait 4 clocks (ca. 90ns) and for Ready signal
	7. hold for 4 clocks -> TH=4
	*/

	#if 1
	/* faster access to isa-bus */
	lis r4,0x0180
	ori r4,r4,0x5940
	#else
	lis r4,0x0100
	ori r4,r4,0x0340
	#endif
	mtdcr EBC0_CFGDATA,r4

	#ifdef IDE_USES_ISA_EMULATION
	li r25,PB5AP /* PB5AP=Peripheral Bank 5 Access Parameters */
	mtdcr EBC0_CFGADDR,r25
	mtdcr EBC0_CFGDATA,r4
	#endif

	li r25,PB6AP /* PB6AP=Peripheral Bank 6 Access Parameters */
	mtdcr EBC0_CFGADDR,r25
	mtdcr EBC0_CFGDATA,r4
	li r25,PB7AP /* PB7AP=Peripheral Bank 7 Access Parameters */
	mtdcr EBC0_CFGADDR,r25
	mtdcr EBC0_CFGDATA,r4

	li r25,PB2CR /* PB2CR=Peripheral Bank 2 Configuration Register */
	mtdcr EBC0_CFGADDR,r25

	lis r4,0x780B
	ori r4,r4,0xA000
	mtdcr EBC0_CFGDATA,r4
	/*
	* the other areas are only 1MiB in size
	*/
	lis r4,0x7401
	ori r4,r4,0xA000

	li r25,PB6CR /* PB6CR=Peripheral Bank 6 Configuration Register */
	mtdcr EBC0_CFGADDR,r25
	lis r4,0x7401
	ori r4,r4,0xA000
	mtdcr EBC0_CFGDATA,r4

	li r25,PB7CR /* PB7CR=Peripheral Bank 7 Configuration Register */
	mtdcr EBC0_CFGADDR,r25
	lis r4,0x7411
	ori r4,r4,0xA000
	mtdcr EBC0_CFGDATA,r4

	#ifndef CONFIG_ISP1161_PRESENT
	li r25,PB4CR /* PB4CR=Peripheral Bank 4 Configuration Register */
	mtdcr EBC0_CFGADDR,r25
	lis r4,0x7421
	ori r4,r4,0xA000
	mtdcr EBC0_CFGDATA,r4
	#endif
	#ifdef IDE_USES_ISA_EMULATION
	li r25,PB5CR /* PB5CR=Peripheral Bank 5 Configuration Register */
	mtdcr EBC0_CFGADDR,r25
	lis r4,0x0000
	ori r4,r4,0x0000
	mtdcr EBC0_CFGDATA,r4
	#endif

	/*-----------------------------------------------------------------------
	* Memory bank 4: USB controller Philips ISP6111
	* 0x77C00000 ... 0x77CFFFFF
	*
	* The chip is connected to:
	* - CPU CS#4
	* - CPU IRQ#2
	* - CPU DMA 3
	*
	* Timing:
	* - command to first data: 300ns. Software must ensure this timing!
	* - Write pulse: 26ns
	* - Read pulse: 33ns
	* - read cycle time: 150ns
	* - write cycle time: 140ns
	*
	* Note: All calculations are based on 33MHz EBC clock. One '#' or '_' is 30ns
	*
	* \|- 300ns --\|
	* \|---- 420ns ---\|---- 420ns ---\| cycle
	* CS ############:###____#######:###____#######
	* OE ############:####___#######:####___#######
	* WE ############:####__########:####__########
	*
	* ----> 2 clocks RD/WR pulses: 60ns
	* ----> CSN: 3 clock, 90ns
	* ----> OEN: 1 clocks (read cycle)
	* ----> WBN: 1 clocks (write cycle)
	* ----> WBE: 2 clocks
	* ----> TH: 7 clock, 210ns
	* ----> TWT: 7 clocks
	----------------------------------------------------------------------- /

	#ifdef CONFIG_ISP1161_PRESENT

	li r4,PB4AP /* PB4AP=Peripheral Bank 4 Access Parameters */
	mtdcr EBC0_CFGADDR,r4

	lis r4,0x030D
	ori r4,r4,0x5E80
	mtdcr EBC0_CFGDATA,r4

	li r4,PB4CR /* PB2CR=Peripheral Bank 4 Configuration Register */
	mtdcr EBC0_CFGADDR,r4

	lis r4,0x77C1
	ori r4,r4,0xA000
	mtdcr EBC0_CFGDATA,r4

	#endif

	#ifndef IDE_USES_ISA_EMULATION

	/*-----------------------------------------------------------------------
	* Memory Bank 5 used for IDE access
	*
	* Timings for IDE Interface
	*
	* SETUP / LENGTH / HOLD - cycles valid for 33.3 MHz clk -> 30ns cycle time
	* 70 165 30 PIO-Mode 0, [ns]
	* 3 6 1 [Cycles] ----> AP=0x040C0200
	* 50 125 20 PIO-Mode 1, [ns]
	* 2 5 1 [Cycles] ----> AP=0x03080200
	* 30 100 15 PIO-Mode 2, [ns]
	* 1 4 1 [Cycles] ----> AP=0x02040200
	* 30 80 10 PIO-Mode 3, [ns]
	* 1 3 1 [Cycles] ----> AP=0x01840200
	* 25 70 10 PIO-Mode 4, [ns]
	* 1 3 1 [Cycles] ----> AP=0x01840200
	*
	----------------------------------------------------------------------- /

	li r4,PB5AP
	mtdcr EBC0_CFGADDR,r4
	lis r4,0x040C
	ori r4,r4,0x0200
	mtdcr EBC0_CFGDATA,r4

	li r4,PB5CR /* PB2CR=Peripheral Bank 2 Configuration Register */
	mtdcr EBC0_CFGADDR,r4

	lis r4,0x7A01
	ori r4,r4,0xA000
	mtdcr EBC0_CFGDATA,r4
	#endif
	/*
	* External Peripheral Control Register
	*/
	li r4,EBC0_CFG
	mtdcr EBC0_CFGADDR,r4

	lis r4,0xB84E
	ori r4,r4,0xF000
	mtdcr EBC0_CFGDATA,r4
	/*
	* drive POST code
	*/
	lis r4,0x7900
	ori r4,r4,0x0080
	li r3,0x0001
	stb r3,0(r4) /* 01 -> external bus controller is initialized */
	nop /* pass2 DCR errata #8 */
	blr