viper.s

eCos操作系统源码

##=============================================================================
##
##      viper.S
##
##      VIPER board hardware setup
##
##=============================================================================
#####ECOSGPLCOPYRIGHTBEGIN####
## -------------------------------------------
## This file is part of eCos, the Embedded Configurable Operating System.
## Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
## Copyright (C) 2002 Gary Thomas
##
## eCos is free software; you can redistribute it and/or modify it under
## the terms of the GNU General Public License as published by the Free
## Software Foundation; either version 2 or (at your option) any later version.
##
## eCos is distributed in the hope that it will be useful, but WITHOUT ANY
## WARRANTY; without even the implied warranty of MERCHANTABILITY or
## FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
## for more details.
##
## You should have received a copy of the GNU General Public License along
## with eCos; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
##
## As a special exception, if other files instantiate templates or use macros
## or inline functions from this file, or you compile this file and link it
## with other works to produce a work based on this file, this file does not
## by itself cause the resulting work to be covered by the GNU General Public
## License. However the source code for this file must still be made available
## in accordance with section (3) of the GNU General Public License.
##
## This exception does not invalidate any other reasons why a work based on
## this file might be covered by the GNU General Public License.
##
## Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
## at http://sources.redhat.com/ecos/ecos-license/
## -------------------------------------------
#####ECOSGPLCOPYRIGHTEND####
##=============================================================================
#######DESCRIPTIONBEGIN####
##
## Author(s):   hmt
## Contributors:hmt, gthomas
## Date:        1999-06-08
## Purpose:     VIPER board hardware setup
## Description: This file contains any code needed to initialize the
##              hardware on a VIPER PPC860 board.
##
######DESCRIPTIONEND####
##
##=============================================================================

#include <pkgconf/hal.h>

#include <cyg/hal/arch.inc>		/* register symbols et al */
#include <cyg/hal/ppc_regs.h>		/* on-chip resource layout, special */
					/* registers, IMM layout...         */
#include <cyg/hal/quicc/ppc8xx.h>       /* more of the same */
	
#------------------------------------------------------------------------------
# this is controlled with one define for tidiness:
# (and it is undefined by default)

//#define CYGPRI_RAM_START_PROGRAMS_UPMS

#if defined(CYG_HAL_STARTUP_ROM) \
 || defined(CYG_HAL_STARTUP_ROMRAM) \
 || defined(CYGPRI_RAM_START_PROGRAMS_UPMS)
# define CYGPRI_DO_PROGRAM_UPMS
#endif

/* The intention is that we only set up the UPMs in ROM start, be it actual
 * ROM application start or Stub ROMs that we built from the same sources.
 * 
 * The alternative approach - in which we have reliability doubts - is to
 * program the UPMs with *old* timing data in StubROM start, then
 * *reprogram* them with *new* timing data in RAM start - and of course
 * program with *new* timing data in plain ROM application start.
 * (Re-programming from new to new timing data fails - hence the suspicion
 * of reprogramming _at_all_, hence this private configuration)
 * 
 * With CYGPRI_RAM_START_PROGRAMS_UPMS left undefined, the former behaviour
 * - programming the UPMs exactly once - is obtained.  Define it to get the
 * latter, untrusted behaviour.
 */
	
#------------------------------------------------------------------------------

// LED macro uses r23, r25: r4 left alone
#define LED( x ) \
	lwi	r25,0xFA100018;         \
	lwi	r23,(x);                \
	stb	r23,0(r25)
	
#------------------------------------------------------------------------------
                
FUNC_START( hal_hardware_init )

	# Throughout this routine, r4 is the base address of the control
	# registers.  r3 and r5 are scratch in general.
	
	lwi     r4,CYGARC_REG_IMM_BASE  # base address of control registers
	mtspr	CYGARC_REG_IMMR,r4
	
	LED( 0 )			# turn all LEDs off

#ifndef CYG_HAL_STARTUP_RAM
                	
#define CACHE_UNLOCKALL		0x0a00
#define CACHE_DISABLE		0x0400
#define CACHE_INVALIDATEALL	0x0c00
#define CACHE_ENABLE		0x0200
#define CACHE_ENABLEBIT		0x8000

#define CACHE_FORCEWRITETHROUGH 0x0100
#define CACHE_NOWRITETHROUGH    0x0300
#define CACHE_CLEAR_LE_SWAP     0x0700

	# DATA CACHE
	mfspr	r3,CYGARC_REG_DC_CST		/* clear error bits */
        lis     r3,CACHE_UNLOCKALL
	sync
        mtspr   CYGARC_REG_DC_CST,r3		/* unlock all lines */
	
        lis     r3,CACHE_INVALIDATEALL
	sync
        mtspr   CYGARC_REG_DC_CST,r3		/* invalidate all lines */

	lis	r3,CACHE_DISABLE
	sync
	mtspr	CYGARC_REG_DC_CST,r3            /* disable */
	
	lis	r3,CACHE_FORCEWRITETHROUGH
	sync
	mtspr	CYGARC_REG_DC_CST,r3            /* set force-writethrough mode */

	lis	r3,CACHE_CLEAR_LE_SWAP
	sync
	mtspr	CYGARC_REG_DC_CST,r3            /* clear little-endian swap mode */
	/* (dunno what this is, but it sounds like a bad thing) */
	
	# INSTRUCTION CACHE (no writeback modes)
	mfspr	r3,CYGARC_REG_IC_CST		/* clear error bits */
        lis     r3,CACHE_UNLOCKALL
        mtspr   CYGARC_REG_IC_CST,r3		/* unlock all lines */
	isync
        lis     r3,CACHE_INVALIDATEALL
        mtspr   CYGARC_REG_IC_CST,r3		/* invalidate all lines */
        isync
	lis	r3,CACHE_DISABLE
	mtspr	CYGARC_REG_IC_CST,r3            /* disable */
	isync
	
	sync
#endif // ! CYG_HAL_STARTUP_RAM
        	
	LED( 0x01 )
	
	/*
	 * SIU Initialization.
	 */
	lwi	r3,0x00610400
        stw	r3,SIUMCR(r4)
	
#ifdef CYG_HAL_STARTUP_ROMRAM
// Need to set the PC into the FLASH (ROM) before the address map changes
	lwi	r3,10f
        lwi     r5,0xFE000000
	or	r3,r3,r5
	mtctr	r3
	bctr
10:	
#endif	

	/*
	 * Enable bus monitor. Disable Watchdog timer.
	 */
	lwi	r3,0xffffff88
	stw	r3,SYPCR(r4)

	/*
	 * Clear REFA & REFB. Enable but freeze timebase.
	 */
	lwi	r3,0x0000            // FIXME:   should this be 0x0000 or 0x00C2
	sth	r3,TBSCR(r4)

	/*
	 * Unlock some RTC registers (see section 5.11.2)
	 */
	lwi	r3,0x55ccaa33
	stw	r3,RTCSCK(r4)
	stw	r3,RTCK(r4)
	stw	r3,RTSECK(r4)
	stw	r3,RTCALK(r4)

	/*
	 * Clear SERC & ALR. RTC runs on freeze. Enable RTC.
	 */
	li	r3,0x0000            // FIXME:   should this be 0x0000 or 0x00C3
	sth	r3,RTCSC(r4)

	/*
	 * Clear periodic timer interrupt status.
	 * Enable periodic timer and stop it on freeze.
	 */
        li	r3,0x0001            // FIXME:   should this be 0x0001 or 0x0083
        sth	r3,PISCR(r4)

	LED( 0x02 )
#ifdef CYGPRI_DO_PROGRAM_UPMS
	/*
	 * Perform UPM programming by writing to its 64 RAM locations.
	 * Note that UPM initialization must be done before the Bank Register
	 * initialization. Otherwise, system may hang when writing to Bank
	 * Registers in certain cases.
	 */
	lis	r5,__upmtbl_start@h
	ori	r5,r5,__upmtbl_start@l
	lis	r6,__upmtbl_end@h
	ori	r6,r6,__upmtbl_end@l
	sub	r7,r6,r5      /* size of table */ 
	srawi	r7,r7,2       /* in words */
        
        li	r6,0x00000000     /* Command - OP=Write, UPMA, MAD=0 */
    1:
        lwz	r3,0(r5)      /* get data from table */
        stw	r3,MDR(r4)    /* store the data to MD register */
        stw	r6,MCR(r4)    /* issue command to MCR register */
        addi	r5,r5,4       /* next entry in the table */
        addi	r6,r6,1       /* next MAD address */
        cmpw	r6,r7         /* done yet ? */
        blt	1b
#endif // CYGPRI_DO_PROGRAM_UPMS
	LED( 0x12 )

	/*
	 * Set refresh timer prescaler to divide by 32 or 64
	 */
#ifdef CYGHWR_HAL_POWERPC_MPC8XX_866T
        li      r3,PTP_DIV64 //use 64 divide as we have run out of bits in the PTA at 133Mhz core
        sth    r3,MPTPR(r4)
#else   
        li     r3,PTP_DIV32
        sth    r3,MPTPR(r4)
#endif

        /*
	 * See Table 15-16 MPC860 User's Manual.
	 *
// Set the value of Machine A Mode Register (MAMR) to $5E802114.
// 	Field PTA (bits 0-7) = 94
// 	Field PTAE (bit 8) = 1
// 	Field AMA (bits 9-11) = 0
// 	Field Reserved (bit 12) = 0
// 	Field DSA (bits 13-14) = 0
// 	Field Reserved (bit 15) = 0
// 	Field G0CLA (bits 16-18) = 1
// 	Field GPL_A4DIS (bit 19) = 0
// 	Field RLFA (bits 20-23) = 1
// 	Field WLFA (bits 24-27) = 1
// 	Field TLFA (bits 28-31) = 4
	 */

//        
// PTA field is (System Clock in MHz * Refresh rate in us) / Prescale
// e.g.  ((14*3.6864)*62.5)/32 => 100.8 => 101        
//
#ifdef CYGHWR_HAL_POWERPC_MPC8XX_866T
#define PLPRCR_PTX 0x1a8d4000 // (133MHz core 10meg input
#define MAMR_PTA 129          // use 133Mhz core as reference
#else        
#if (CYGHWR_HAL_POWERPC_BOARD_SPEED == 47)
#define PLPRCR_PTX 0x00C04000 // (47MHz/3.6864MHz)-1
#define MAMR_PTA 94        
#endif        
#if (CYGHWR_HAL_POWERPC_BOARD_SPEED == 51)
#define PLPRCR_PTX 0x00D04000 // (51.6MHz/3.6864MHz)-1
#define MAMR_PTA 101
#endif        
#if (CYGHWR_HAL_POWERPC_BOARD_SPEED == 55)
#define PLPRCR_PTX 0x00E04000 // (55.3MHz/3.6864MHz)-1
#define MAMR_PTA 108
#endif        
#if (CYGHWR_HAL_POWERPC_BOARD_SPEED == 59)
#define PLPRCR_PTX 0x00F04000 // (58.9MHz/3.6864MHz)-1