board.c

u-boot-1.1.6 源码包

/*
 * (C) Copyright 2003
 * Josef Baumgartner <[e-mail]>
 *
 * (C) Copyright 2000-2002
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program 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 of
 * the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <watchdog.h>
#include <command.h>
#include <malloc.h>
#include <devices.h>

#ifdef	CONFIG_M5272
#include <asm/immap_5272.h>
#endif

#if (CONFIG_COMMANDS & CFG_CMD_IDE)
#include <ide.h>
#endif
#if (CONFIG_COMMANDS & CFG_CMD_SCSI)
#include <scsi.h>
#endif
#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
#include <kgdb.h>
#endif
#ifdef CONFIG_STATUS_LED
#include <status_led.h>
#endif
#include <net.h>
#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
#include <cmd_bedbug.h>
#endif
#ifdef CFG_ALLOC_DPRAM
#include <commproc.h>
#endif
#include <version.h>

#if defined(CONFIG_HARD_I2C) || \
    defined(CONFIG_SOFT_I2C)
#include <i2c.h>
#endif

DECLARE_GLOBAL_DATA_PTR;

static char *failed = "*** failed ***\n";

#ifdef	CONFIG_PCU_E
extern flash_info_t flash_info[];
#endif

#include <environment.h>

#if ( ((CFG_ENV_ADDR+CFG_ENV_SIZE) < CFG_MONITOR_BASE) || \
      (CFG_ENV_ADDR >= (CFG_MONITOR_BASE + CFG_MONITOR_LEN)) ) || \
    defined(CFG_ENV_IS_IN_NVRAM)
#define	TOTAL_MALLOC_LEN	(CFG_MALLOC_LEN + CFG_ENV_SIZE)
#else
#define	TOTAL_MALLOC_LEN	CFG_MALLOC_LEN
#endif

extern ulong __init_end;
extern ulong _end;

extern	void timer_init(void);

#if defined(CONFIG_WATCHDOG)
# define INIT_FUNC_WATCHDOG_INIT	watchdog_init,
# define WATCHDOG_DISABLE		watchdog_disable

extern int watchdog_init(void);
extern int watchdog_disable(void);
#else
# define INIT_FUNC_WATCHDOG_INIT	/* undef */
# define WATCHDOG_DISABLE		/* undef */
#endif /* CONFIG_WATCHDOG */

ulong monitor_flash_len;

/*
 * Begin and End of memory area for malloc(), and current "brk"
 */
static	ulong	mem_malloc_start = 0;
static	ulong	mem_malloc_end	 = 0;
static	ulong	mem_malloc_brk	 = 0;

/************************************************************************
 * Utilities								*
 ************************************************************************
 */

/*
 * The Malloc area is immediately below the monitor copy in DRAM
 */
static void mem_malloc_init (void)
{
	ulong dest_addr = CFG_MONITOR_BASE + gd->reloc_off;

	mem_malloc_end = dest_addr;
	mem_malloc_start = dest_addr - TOTAL_MALLOC_LEN;
	mem_malloc_brk = mem_malloc_start;

	memset ((void *) mem_malloc_start,
		0,
		mem_malloc_end - mem_malloc_start);
}

void *sbrk (ptrdiff_t increment)
{
	ulong old = mem_malloc_brk;
	ulong new = old + increment;

	if ((new < mem_malloc_start) ||
	    (new > mem_malloc_end) ) {
		return (NULL);
	}
	mem_malloc_brk = new;
	return ((void *)old);
}

char *strmhz(char *buf, long hz)
{
    long l, n;
    long m;

    n = hz / 1000000L;

    l = sprintf (buf, "%ld", n);

    m = (hz % 1000000L) / 1000L;

    if (m != 0)
	sprintf (buf+l, ".%03ld", m);

    return (buf);
}

/*
 * All attempts to come up with a "common" initialization sequence
 * that works for all boards and architectures failed: some of the
 * requirements are just _too_ different. To get rid of the resulting
 * mess of board dependend #ifdef'ed code we now make the whole
 * initialization sequence configurable to the user.
 *
 * The requirements for any new initalization function is simple: it
 * receives a pointer to the "global data" structure as it's only
 * argument, and returns an integer return code, where 0 means
 * "continue" and != 0 means "fatal error, hang the system".
 */
typedef int (init_fnc_t) (void);

/************************************************************************
 * Init Utilities							*
 ************************************************************************
 * Some of this code should be moved into the core functions,
 * but let's get it working (again) first...
 */

static int init_baudrate (void)
{
	uchar tmp[64];	/* long enough for environment variables */
	int i = getenv_r ("baudrate", tmp, sizeof (tmp));

	gd->baudrate = (i > 0)
			? (int) simple_strtoul (tmp, NULL, 10)
			: CONFIG_BAUDRATE;
	return (0);
}

/***********************************************************************/

static int init_func_ram (void)
{
	int board_type = 0;	/* use dummy arg */
	puts ("DRAM:  ");

	if ((gd->ram_size = initdram (board_type)) > 0) {
		print_size (gd->ram_size, "\n");
		return (0);
	}
	puts (failed);
	return (1);
}

/***********************************************************************/

#if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
static int init_func_i2c (void)
{
	puts ("I2C:   ");
	i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE);
	puts ("ready\n");
	return (0);
}
#endif

/***********************************************************************/

/************************************************************************
 * Initialization sequence						*
 ************************************************************************
 */

init_fnc_t *init_sequence[] = {
	env_init,
	init_baudrate,
	serial_init,
	console_init_f,
	display_options,
	checkcpu,
	checkboard,
#if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
	init_func_i2c,
#endif
	init_func_ram,
#if defined(CFG_DRAM_TEST)
	testdram,
#endif /* CFG_DRAM_TEST */
	INIT_FUNC_WATCHDOG_INIT
	NULL,			/* Terminate this list */
};


/************************************************************************
 *
 * This is the first part of the initialization sequence that is
 * implemented in C, but still running from ROM.
 *
 * The main purpose is to provide a (serial) console interface as
 * soon as possible (so we can see any error messages), and to
 * initialize the RAM so that we can relocate the monitor code to
 * RAM.
 *
 * Be aware of the restrictions: global data is read-only, BSS is not
 * initialized, and stack space is limited to a few kB.
 *
 ************************************************************************
 */

void
board_init_f (ulong bootflag)
{
	bd_t *bd;
	ulong len, addr, addr_sp;
	ulong *paddr;
	gd_t *id;
	init_fnc_t **init_fnc_ptr;
#ifdef CONFIG_PRAM
	int i;
	ulong reg;
	uchar tmp[64];		/* long enough for environment variables */
#endif

	/* Pointer is writable since we allocated a register for it */
	gd = (gd_t *) (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET);
	/* compiler optimization barrier needed for GCC >= 3.4 */
	__asm__ __volatile__("": : :"memory");

	/* Clear initial global data */
	memset ((void *) gd, 0, sizeof (gd_t));

	for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
		if ((*init_fnc_ptr)() != 0) {
			hang ();
		}
	}

	/*
	 * Now that we have DRAM mapped and working, we can
	 * relocate the code and continue running from DRAM.
	 *
	 * Reserve memory at end of RAM for (top down in that order):
	 *	- protected RAM
	 *	- LCD framebuffer
	 *	- monitor code
	 *	- board info struct
	 */
	len = (ulong)&_end - CFG_MONITOR_BASE;

	addr = CFG_SDRAM_BASE + gd->ram_size;

#ifdef CONFIG_LOGBUFFER
	/* reserve kernel log buffer */
	addr -= (LOGBUFF_RESERVE);
	debug ("Reserving %dk for kernel logbuffer at %08lx\n", LOGBUFF_LEN, addr);
#endif

#ifdef CONFIG_PRAM
	/*
	 * reserve protected RAM
	 */
	i = getenv_r ("pram", tmp, sizeof (tmp));
	reg = (i > 0) ? simple_strtoul (tmp, NULL, 10) : CONFIG_PRAM;
	addr -= (reg << 10);		/* size is in kB */
	debug ("Reserving %ldk for protected RAM at %08lx\n", reg, addr);
#endif /* CONFIG_PRAM */

	/*
	 * reserve memory for U-Boot code, data & bss
	 * round down to next 4 kB limit
	 */
	addr -= len;
	addr &= ~(4096 - 1);

	debug ("Reserving %ldk for U-Boot at: %08lx\n", len >> 10, addr);

	/*
	 * reserve memory for malloc() arena
	 */
	addr_sp = addr - TOTAL_MALLOC_LEN;
	debug ("Reserving %dk for malloc() at: %08lx\n",
			TOTAL_MALLOC_LEN >> 10, addr_sp);

	/*
	 * (permanently) allocate a Board Info struct
	 * and a permanent copy of the "global" data
	 */
	addr_sp -= sizeof (bd_t);
	bd = (bd_t *) addr_sp;
	gd->bd = bd;
	debug ("Reserving %d Bytes for Board Info at: %08lx\n",
			sizeof (bd_t), addr_sp);
	addr_sp -= sizeof (gd_t);
	id = (gd_t *) addr_sp;
	debug ("Reserving %d Bytes for Global Data at: %08lx\n",
			sizeof (gd_t), addr_sp);

 	/* Reserve memory for boot params. */
	addr_sp -= CFG_BOOTPARAMS_LEN;
	bd->bi_boot_params = addr_sp;
	debug ("Reserving %dk for boot parameters at: %08lx\n",
			CFG_BOOTPARAMS_LEN >> 10, addr_sp);

	/*
	 * Finally, we set up a new (bigger) stack.
	 *
	 * Leave some safety gap for SP, force alignment on 16 byte boundary
	 * Clear initial stack frame
	 */
	addr_sp -= 16;
	addr_sp &= ~0xF;

	paddr = (ulong *)addr_sp;
	*paddr-- = 0;
	*paddr-- = 0;
	addr_sp = (ulong)paddr;