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 1.17 2003/08/10 10:52:35 pefo Exp $ */

/*
 * Copyright (c) 2001 Opsycon AB  (www.opsycon.se)
 * 
 * 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 by Opsycon 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.
 *
 */
#if 1
#include <sys/param.h>
#include <sys/syslog.h>
#include <machine/endian.h>
#include <sys/device.h>
#include <machine/cpu.h>
#include <machine/pio.h>
#include <machine/intr.h>
#include <dev/pci/pcivar.h>
#endif
#include <sys/types.h>
#include <termio.h>
#include <string.h>
#include <time.h>
#include <stdlib.h>

#include <autoconf.h>

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

#include "pflash.h"
#include "dev/pflash_tgt.h"

#include "include/ocelot_g.h"
#include <pmon/dev/gt64240reg.h>
#include <pmon/dev/ns16550.h>
#include "include/m48t37.h"

#include <pmon.h>

#include "flash.h"
#if (NMOD_FLASH_AMD + NMOD_FLASH_INTEL) == 0
#ifdef HAVE_FLASH
#undef HAVE_FLASH
#endif
#else
#define HAVE_FLASH
#endif


#define	TOD_REG(x) (clkbase + x)

extern char _end[];

extern struct trapframe DBGREG;

extern void *memset __P((void *, int, size_t));
extern unsigned char hwethadr[6];

static int md_pipefreq = 0;
static int md_cpufreq = 0;
static int clk_invalid = 0;
static int nvram_invalid = 0;
static int cksum __P((void *p, size_t s, int set));
static void _probe_frequencies __P((void));

ConfigEntry	ConfigTable[] =
{
	{ (char *)COM1_BASE_ADDR, 0, ns16550, 256, CONS_BAUD, NS16550HZ },
	{ (char *)COM2_BASE_ADDR, 0, ns16550, 256, CONS_BAUD, NS16550HZ },
	{ 0 }
};

unsigned long _filebase;

extern char MipsException[], MipsExceptionEnd[];

void initmips __P((u_int32_t));

void
initmips(msize)
	u_int32_t msize;
{
	u_int32_t totalSize;

	totalSize = msize;

SBD_DISPLAY ("MSIZ", CHKPNT_AUTO); 

	totalmemsize = totalSize;

	/*
	 *  Set up memory address decoders to map entire memory.
	 *  But first move away bootrom map to high memory.
	 */
	GT_WRITE(BOOTCS_LOW_DECODE_ADDRESS, BOOT_BASE >> 20);
	GT_WRITE(BOOTCS_HIGH_DECODE_ADDRESS, (BOOT_BASE + BOOT_SIZE - 1) >> 20);

	if(msize == 0x20000000) {		/* 512 Mb */
		GT_WRITE(SCS_2_LOW_DECODE_ADDRESS, 0x100);
		GT_WRITE(SCS_2_HIGH_DECODE_ADDRESS, 0x1ff);
		GT_WRITE(SCS_0_HIGH_DECODE_ADDRESS, 0x0ff);
	}
	else {					/* 1Gb */
		GT_WRITE(SCS_2_LOW_DECODE_ADDRESS, 0x200);
		GT_WRITE(SCS_2_HIGH_DECODE_ADDRESS, 0x3ff);
		GT_WRITE(SCS_0_HIGH_DECODE_ADDRESS, 0x1ff);
	}

	/*
	 *  Probe clock frequencys so delays will work properly.
	 */
	tgt_cpufreq();

	/*
	 *  Init PMON and debug
	 */
	cpuinfotab[0] = &DBGREG;
	dbginit(NULL);

	/*
	 *  Set up exception vectors.
	 */
	bcopy(MipsException, (char *)TLB_MISS_EXC_VEC, MipsExceptionEnd - MipsException);
	bcopy(MipsException, (char *)GEN_EXC_VEC, MipsExceptionEnd - MipsException);

	CPU_FlushCache();
	CPU_SetSR(0, SR_BOOT_EXC_VEC);

	/*
	 *  Register initial memory map.
	 */
	register_mem((void *)0, (void *)totalmemsize-1, MEM_RAM, "SDRAM");

	register_mem((void *)CACHED_TO_PHYS(memtop), kmemtop-1,
		MEM_DATA, "Kernel data");
	register_mem((void *)0, (void *)CACHED_TO_PHYS(_end)-1,
		MEM_CODE, "PMON2000");
	register_mem((void *)CACHED_TO_PHYS(_end),
		(void *)CACHED_TO_PHYS(heaptop)-1, MEM_DATA, "PMON2000 heap");

	register_mem((void *)FPGA_BASE, (void *)BOOT_BASE+BOOT_SIZE-1,
		MEM_IO, "decoded space");
	register_mem((void *)FPGA_BASE, (void *)FPGA_BASE+FPGA_SIZE-1,
		MEM_IO, "fpga control");
	register_mem((void *)RTC_BASE, (void *)RTC_BASE+RTC_SIZE-1,
		MEM_IO, "RTC and NVRAM");
	register_mem((void *)UART_BASE, (void *)UART_BASE+UART_SIZE-1,
		MEM_IO, "NS16552");
	register_mem((void *)FLASH_BASE, (void *)FLASH_BASE+FLASH_SIZE-1,
		MEM_FLASH, "DiskOnChip");
	register_mem((void *)GT_BASE_ADDR, (void *)GT_BASE_ADDR+65535,
		MEM_IO, "internal registers");
	register_mem((void *)0xffc00000, (void *)0xffc7ffff,
		MEM_FLASH, "boot flash");
	/*
	 * Launch!
	 */
	pmon_main();
}

/*
 *  Put all machine dependent initialization here. This call
 *  is done after console has been initialized so it's safe
 *  to output configuration and debug information with printf.
 */

void
tgt_devconfig()
{
	_pci_devinit(1);	/* PCI device initialization */

	/* Set the PHY addresses for the GT ethernet */
	GT_WRITE(ETH_PHY_ADDR_REG, 0x2828);
	GT_WRITE(MAIN_ROUTING_REGISTER, 0x007ffe38);
	GT_WRITE(SERIAL_PORT_MULTIPLEX, 0x00000102);

        config_init();
        configure();
}

void
tgt_devinit()
{
	/*
	 *  Gather info about and configure caches.
	 */
	if(getenv("ocache_off")) {
		CpuOnboardCacheOn = 0;
	}
	else {
		CpuOnboardCacheOn = 1;
	}
	if(getenv("ecache_off")) {
		CpuExternalCacheOn = 0;
	}
	else {
		CpuExternalCacheOn = 1;
	}
	CPU_ConfigCache();

	/* Register Discovery area where PCI lives */
	register_mem((void *)0xc0000000, (void *)0xffffffff, MEM_IO, "MV64240 I/O");

	_pci_businit(1);	/* PCI bus initialization */
}


void
tgt_reboot()
{
	void (*longreach) __P((void));
	int i;

	/* Reset reset cause */
	out8(PLD_RSTAT, in8(PLD_RSTAT));

	/* Enable watchdog one tick at 1/16th second */
	out8(M48T37_BASE+7, 0x84);
	/* Then wait... */
	for(i = 0; i < 200000000; i++);

	/* Unreliable but try this if watchdog fails... */
	printf("Watchdog reboot failed!\n");
	longreach = (void *)0xbfc00000;
	(*longreach)();
	while(1);
}


/*
 *  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(SR_COP_1_BIT|SR_FR_32|SR_EXL);
}


/*
 *  Target dependent version printout.
 *  Printout available target version information.
 */
void
tgt_cmd_vers()
{
	printf("Board revision level: %c.\n", in8(PLD_BAR) + 'A');
	printf("PLD revision levels: %d.%d and %d.%d.\n",
					in8(PLD_ID1) >> 4, in8(PLD_ID1) & 15,
					in8(PLD_ID2) >> 4, in8(PLD_ID2) & 15);
}

/*
 *  Display any target specific logo.
 */
#if defined(HAVE_LOGO)
void
tgt_logo()
{
}
#endif


static void
_probe_frequencies()
{
#ifdef HAVE_TOD
	int i, timeout, cur, sec, cnt;
        int clkbase = M48T37_BASE;
#endif
extern void tgt_setpar100mhz __P((void));

	SBD_DISPLAY ("FREQ", CHKPNT_FREQ);


	md_pipefreq = 300000000;	/* Defaults */
	md_cpufreq  = 100000000;
	clk_invalid = 1;


#ifdef HAVE_TOD
	/*
	 *  Check if clock is stopped and start it if it is.
	 */
	if(inb(TOD_REG(TOD_SECOND)) & TOD_SECOND_ST) {
		outb(TOD_REG(TOD_SECOND), inb(TOD_REG(TOD_SECOND)) & ~TOD_SECOND_ST);
	}
	else {
		clk_invalid = 0;
	}


	/*
	 * 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 = CPU_GetCOUNT();
		timeout = 100000000;

		outb(TOD_REG(TOD_CTRL), inb(TOD_REG(TOD_CTRL)) | TOD_CTRL_R);	/* stop update */
		sec = inb(TOD_REG(TOD_SECOND)) & 0x0f; 
		outb(TOD_REG(TOD_CTRL), inb(TOD_REG(TOD_CTRL)) & ~TOD_CTRL_R);	/* start update */

		do {
			timeout--;
			outb(TOD_REG(TOD_CTRL), inb(TOD_REG(TOD_CTRL)) | TOD_CTRL_R);
			cur = inb(TOD_REG(TOD_SECOND)) & 0x0f; 
			outb(TOD_REG(TOD_CTRL), inb(TOD_REG(TOD_CTRL)) & ~TOD_CTRL_R);
		} while(timeout != 0 && cur == sec);

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

	/*
	 *  Calculate the external bus clock frequency.
	 */
	md_pipefreq = (cnt  + 5999)/ 10000;
	md_pipefreq *= 20000;

	/*
	 *  Calculate the external frequency.
	 */
	i =  2 - ((CPU_GetCONFIG() >> 16) & 1);		/* Halfclock bit */
	md_cpufreq = md_pipefreq * 2;
	md_cpufreq /= (((CPU_GetCONFIG() >> 28) & 7) + 2) * i;

	/*
	 * Hack to change timing of GT64240 if not 125Mhz FSB.
	 */

	if(md_cpufreq < 110000000) {
		tgt_setpar100mhz();
	}
#endif /* HAVE_TOD */
}


/*
 *   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);
}

#ifdef HAVE_TOD
/*
 *  Returns the current time if a TOD clock is present or 0
 *  This code is defunct after 2088... (out of bits)
 */
#define FROMBCD(x)      (((x) >> 4) * 10 + ((x) & 0xf))
#define TOBCD(x)        (((x) / 10 * 16) + ((x) % 10)) 
#define YEARDAYS(year)  ((((year) % 4) == 0 && \
                         ((year % 100) != 0 || (year % 400) == 0)) ? 366 : 365)
#define SECMIN  (60)            /* seconds per minute */
#define SECHOUR (60*SECMIN)     /* seconds per hour */
#define SECDAY  (24*SECHOUR)    /* seconds per day */
#define SECYR   (365*SECDAY)    /* seconds per common year */

static const short dayyr[12] =
    { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };

time_t
tgt_gettime()
{
	struct tm tm;
        int clkbase = M48T37_BASE;
	int century;
	time_t t;

	if(clk_invalid) {
		tm.tm_sec = 0;
		tm.tm_min = 0;
		tm.tm_hour = 0;
		tm.tm_wday = 0;
		tm.tm_mday = 1;
		tm.tm_mon = 1;
		tm.tm_year = 0;
	}
	else {
		outb(TOD_REG(TOD_CTRL), inb(TOD_REG(TOD_CTRL)) | TOD_CTRL_R);
		tm.tm_sec = FROMBCD(inb(TOD_REG(TOD_SECOND)));
		tm.tm_min = FROMBCD(inb(TOD_REG(TOD_MINUTE)));
		tm.tm_hour = FROMBCD(inb(TOD_REG(TOD_HOUR)));
		tm.tm_wday = FROMBCD(inb(TOD_REG(TOD_DAY)));
		tm.tm_mday = FROMBCD(inb(TOD_REG(TOD_DATE)));
		tm.tm_mon = FROMBCD(inb(TOD_REG(TOD_MONTH))) - 1;
		tm.tm_year = FROMBCD(inb(TOD_REG(TOD_YEAR)));
		century = FROMBCD(inb(TOD_REG(TOD_CENTURY)));
		outb(TOD_REG(TOD_CTRL), inb(TOD_REG(TOD_CTRL)) & ~TOD_CTRL_R);
	}

	/* Since tm_year is defined to be years since 1900 we compute */
	/* the correct value here                                     */
	tm.tm_year = century*100 + tm.tm_year - 1900;
	tm.tm_isdst = tm.tm_gmtoff = 0;
	t = gmmktime(&tm);
	if(clk_invalid) {
		tgt_settime(t);
	}
        return(t);
}

/*
 *  Set the current time if a TOD clock is present
 */
void
tgt_settime(time_t t)
{
	struct tm *tm;
        int clkbase = M48T37_BASE;
	int century;

	tm = gmtime(&t);

	/* Enable register writing */
	outb(TOD_REG(TOD_CTRL), inb(TOD_REG(TOD_CTRL)) | TOD_CTRL_W);

	century = (tm->tm_year + 1900)/100;
        outb(TOD_REG(TOD_CENTURY), TOBCD(century));
        outb(TOD_REG(TOD_YEAR), TOBCD((tm->tm_year + 1900) % 100));
        outb(TOD_REG(TOD_MONTH), TOBCD(tm->tm_mon + 1));