cpu_init.c

linux下的BOOT程序原码,有需要的可以来下,保证好用

/*
 * (C) Copyright 2000-2003
 * 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 <mpc8220.h>

/*
 * Breath some life into the CPU...
 *
 * Set up the memory map,
 * initialize a bunch of registers.
 */
void cpu_init_f (void)
{
	DECLARE_GLOBAL_DATA_PTR;

	volatile flexbus8220_t *flexbus = (volatile flexbus8220_t *) MMAP_FB;
	volatile pcfg8220_t *portcfg = (volatile pcfg8220_t *) MMAP_PCFG;
	volatile xlbarb8220_t *xlbarb = (volatile xlbarb8220_t *) MMAP_XLBARB;

	/* Pointer is writable since we allocated a register for it */
	gd = (gd_t *) (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET);

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

	/* Clear all port configuration */
	portcfg->pcfg0 = 0;
	portcfg->pcfg1 = 0;
	portcfg->pcfg2 = 0;
	portcfg->pcfg3 = 0;
	portcfg->pcfg2 = CFG_GP1_PORT2_CONFIG;
	portcfg->pcfg3 = CFG_PCI_PORT3_CONFIG | CFG_GP2_PORT3_CONFIG;

	/*
	 * Flexbus Controller: configure chip selects and enable them
	 */
#if defined (CFG_CS0_BASE)
	flexbus->csar0 = CFG_CS0_BASE;

/* Sorcery-C can hang-up after CTRL reg initialization */
#if defined (CFG_CS0_CTRL)
	flexbus->cscr0 = CFG_CS0_CTRL;
#endif
	flexbus->csmr0 = ((CFG_CS0_MASK - 1) & 0xffff0000) | 1;
	__asm__ volatile ("sync");
#endif
#if defined (CFG_CS1_BASE)
	flexbus->csar1 = CFG_CS1_BASE;
	flexbus->cscr1 = CFG_CS1_CTRL;
	flexbus->csmr1 = ((CFG_CS1_MASK - 1) & 0xffff0000) | 1;
	__asm__ volatile ("sync");
#endif
#if defined (CFG_CS2_BASE)
	flexbus->csar2 = CFG_CS2_BASE;
	flexbus->cscr2 = CFG_CS2_CTRL;
	flexbus->csmr2 = ((CFG_CS2_MASK - 1) & 0xffff0000) | 1;
	portcfg->pcfg3 |= CFG_CS2_PORT3_CONFIG;
	__asm__ volatile ("sync");
#endif
#if defined (CFG_CS3_BASE)
	flexbus->csar3 = CFG_CS3_BASE;
	flexbus->cscr3 = CFG_CS3_CTRL;
	flexbus->csmr3 = ((CFG_CS3_MASK - 1) & 0xffff0000) | 1;
	portcfg->pcfg3 |= CFG_CS3_PORT3_CONFIG;
	__asm__ volatile ("sync");
#endif
#if defined (CFG_CS4_BASE)
	flexbus->csar4 = CFG_CS4_BASE;
	flexbus->cscr4 = CFG_CS4_CTRL;
	flexbus->csmr4 = ((CFG_CS4_MASK - 1) & 0xffff0000) | 1;
	portcfg->pcfg3 |= CFG_CS4_PORT3_CONFIG;
	__asm__ volatile ("sync");
#endif
#if defined (CFG_CS5_BASE)
	flexbus->csar5 = CFG_CS5_BASE;
	flexbus->cscr5 = CFG_CS5_CTRL;
	flexbus->csmr5 = ((CFG_CS5_MASK - 1) & 0xffff0000) | 1;
	portcfg->pcfg3 |= CFG_CS5_PORT3_CONFIG;
	__asm__ volatile ("sync");
#endif

	/* This section of the code cannot place in cpu_init_r(),
	   it will cause the system to hang */
	/* enable timebase */
	xlbarb->addrTenTimeOut = 0x1000;
	xlbarb->dataTenTimeOut = 0x1000;
	xlbarb->busActTimeOut = 0x2000;

	xlbarb->config = 0x00002000;

	/* Master Priority Enable */
	xlbarb->mastPriority = 0;
	xlbarb->mastPriEn = 0xff;
}

/*
 * initialize higher level parts of CPU like time base and timers
 */
int cpu_init_r (void)
{
	/* this may belongs to disable interrupt section */
	/* mask all interrupts */
	*(vu_long *) 0xf0000700 = 0xfffffc00;
	*(vu_long *) 0xf0000714 |= 0x0001ffff;
	*(vu_long *) 0xf0000710 &= ~0x00000f00;

	/* route critical ints to normal ints */
	*(vu_long *) 0xf0000710 |= 0x00000001;

#if (CONFIG_COMMANDS & CFG_CMD_NET) && defined(CONFIG_MPC8220_FEC)
	/* load FEC microcode */
	loadtask (0, 2);
#endif
	return (0);
}