tgt_machdep.c

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

/*	$Id: tgt_machdep.c,v 1.3 2001/12/11 18:01:13 pefo Exp $ */

/*
 * Copyright (c) 2000 Opsycon AB  (www.opsycon.se)
 * Copyright (c) 2000 Rtmx, Inc   (www.rtmx.com)
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed for Rtmx, Inc by
 *	Opsycon Open System Consulting AB, Sweden.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */
#include <sys/types.h>
#include <stdio.h>
#include <setjmp.h>
#include <termio.h>
#include <string.h>
#include <time.h>

#include <machine/cpu.h>
#include <machine/pio.h>

#include <include/palomarii.h>
#include <pmon/dev/cpc700.h>
#include <pmon/dev/cpc700_iic.h>
#include <pmon.h>

extern int ns16550 __P((int, char *, int, int));
extern char hwethadr[6];

int md_pipefreq = 0;
int md_cpufreq = 0;

ConfigEntry	ConfigTable[] =
{
	{ (char *)REAR_COM_BASE_ADDR, 0, ns16550, 256, B9600 },
	{ (char *)CPC700_UART0RBR, 0, ns16550, 256, B9600 },
	{ (char *)FRONT_COM_BASE_ADDR, 0, ns16550, 256, B9600 },
	{ 0 }
};

unsigned long _filebase;

static void _probe_frequencies __P((void));
void tgt_rtinit(void);

/*
 *  This function makes inital HW setup for debugger and
 *  returns the apropriate setting for the status register.
 */
register_t
tgt_enable(int machtype)
{
	/* XXX Do any HW specific setup */
	return(PSL_IR|PSL_DR|PSL_FP|PSL_RI|PSL_ME|PSL_FE_DFLT);
}


/*
 *  Print out any target specific logo
 */
void
tgt_logo()
{
    printf("\n");
    printf("[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[\n");
    printf("[[[            [[[[   [[[[[[[[[[   [[[[            [[[[   [[[[[[[  [[\n");
    printf("[[   [[[[[[[[   [[[    [[[[[[[[    [[[   [[[[[[[[   [[[    [[[[[[  [[\n");
    printf("[[  [[[[[[[[[[  [[[  [  [[[[[[  [  [[[  [[[[[[[[[[  [[[  [  [[[[[  [[\n");
    printf("[[  [[[[[[[[[[  [[[  [[  [[[[  [[  [[[  [[[[[[[[[[  [[[  [[  [[[[  [[\n");
    printf("[[   [[[[[[[[   [[[  [[[  [[  [[[  [[[  [[[[[[[[[[  [[[  [[[  [[[  [[\n");
    printf("[[             [[[[  [[[[    [[[[  [[[  [[[[[[[[[[  [[[  [[[[  [[  [[\n");
    printf("[[  [[[[[[[[[[[[[[[  [[[[[  [[[[[  [[[  [[[[[[[[[[  [[[  [[[[[  [  [[\n");
    printf("[[  [[[[[[[[[[[[[[[  [[[[[[[[[[[[  [[[  [[[[[[[[[[  [[[  [[[[[[    [[\n");
    printf("[[  [[[[[[[[[[[[[[[  [[[[[[[[[[[[  [[[   [[[[[[[[   [[[  [[[[[[[   [[\n");
    printf("[[  [[[[[[[[[[[[[[[  [[[[[[[[[[[[  [[[[            [[[[  [[[[[[[[  [[\n");
    printf("[[[[[[[2000][[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[\n");
}

/*
 *  Target dependent version printout.
 *  Printout available target version information.
 */
void
tgt_cmd_vers()
{
    /*	printf("Board revision level: %c.\n", in8(PLD_BAR) + 'A'); */
}

static void
_probe_frequencies()
{
extern void loopforameg __P((void));
#if 0
	int i, timeout, sec, cur, cnt;
#endif

	SBD_DISPLAY ("FREQ", CHKPNT_FREQ);

#if 0
	md_pipefreq = 200000000;	/* Defaults */
#else
        /* Set default to 400MHz */
	md_pipefreq = 400000000;	/* Defaults */
#endif
        
	md_cpufreq = 66000000;
#if 0
	/*
	 * Select correct clock frequency source and 24Hr mode.
	 */
	clkwrite(MC_REGA, (clkread(MC_REGA) & 0x80) | MC_BASE_32_KHz | MC_RATE_2);

	/*
	 * Do the next twice for two reasons. First make sure we run from
	 * cache. Second make sure synched on second update. (Pun intended!)
	 */
	for(i = 2;  i != 0; i--) {
		cnt = get_count();
		timeout = 10000000;

		sec = clkread(MC_SEC); 

		do {
			timeout--;
			cur = clkread(MC_SEC);
		} while(timeout != 0 && cur == sec);

		cnt = get_count() - cnt;
		if(timeout == 0) {
			clk_invalid = 1;
			return;		/* Get out if clock is not running */
		}
	}

	/*
	 *  Calculate the external bus clock frequency.
	 */
	md_cpufreq = (cnt + 100000) / 100000;
	md_cpufreq *= 400000;

	/*
	 *  Calculate the cpu pipeline frequency.
	 */
	for(i = 2;  i != 0; i--) {
		cnt = get_count();
		loopforameg();
		cnt = get_count() - cnt;
	}
	md_pipefreq = (md_cpufreq / cnt + 1) / 4;
	md_pipefreq *= 1000000;
#endif	
}


/*
 *   Returns the CPU pipelie clock frequency
 */
int
tgt_pipefreq()
{
	if(md_pipefreq == 0) {
		_probe_frequencies();
	}
	return(md_pipefreq);
}

/*
 *   Returns the external clock frequency, usually the bus clock
 */
int
tgt_cpufreq()
{
	if(md_cpufreq == 0) {
		_probe_frequencies();
	}
	return(md_cpufreq);
}


/*
 *  Print out any target specific memory information
 */
void
tgt_memprint()
{

	if(tgt_gettime() == -1) {
		printf("\nWARN! Date invalid, use 'date' to set time!\n");
	}
}

void
tgt_machprint()
{
	printf("BSP Copyright 2001, IP Unplugged Inc.\n");
#if 0
	printf("CPU PowerPC %s @", md_cpuname());
#else
        printf("CPU PowerPC 750 @");
#endif        
} 

/*
 *  Return a suitable address for the client stack.
 *  Usually top of RAM memory.
 */

register_t
tgt_clienttos()
{
	return((memorysize & ~7) - 64);
}


/*
 *  Network stuff.
 */
void
tgt_netinit()
{
}

int
tgt_ethaddr(char *p)
{
	bcopy((void *)&hwethadr, p, 6);
	return(0);
}

void
tgt_netreset()
{
}


/*
 *  Simple display function to display a 4 char string or code.
 *  Called during startup to display progress on any feasible
 *  display before any serial port have been initialized.
 */
void
tgt_display(char *msg, int x)
{
	/* Have simple serial port driver */
	tgt_putchar(msg[0]);
	tgt_putchar(msg[1]);
	tgt_putchar(msg[2]);
	tgt_putchar(msg[3]);
	tgt_putchar('\r');
	tgt_putchar('\n');
}

void
tgt_poll()
{
	/* No target devices to poll */
}

void
clrhndlrs()
{
}

int
tgt_getmachtype()
{
	return(md_cputype());
}

/*
 *  Create stubs if network is not compiled in
 */
#ifdef INET
void
tgt_netpoll()
{
	splx(splhigh());
}

#else
gsignal(jmp_buf jb, int	sig)
{
	if(jb != NULL) {
		longjmp(jb, 1);
	}
}

netopen()	{ return -1;}
netread()	{ return -1;}
netwrite()	{ return -1;}
netclose()	{ return -1;}
netlseek()	{ return -1;}
netioctl()	{ return -1;}
void netpoll()	{}

unsigned long
__time()
{
	return(tgt_gettime));
}
#endif /*INET*/