cpci5200.c

Uboot源码,非常通用的bootloader.适用于各种平台的Linux系统引导.

/*
 * (C) Copyright 2003
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * (C) Copyright 2004
 * Mark Jonas, Freescale Semiconductor, [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
 */

/*
 * cpci5200.c - main board support/init for the esd cpci5200.
 */

#include <common.h>
#include <mpc5xxx.h>
#include <pci.h>
#include <command.h>

#include "mt46v16m16-75.h"

void init_ata_reset(void);

static void sdram_start(int hi_addr)
{
	long hi_addr_bit = hi_addr ? 0x01000000 : 0;

	/* unlock mode register */
	*(vu_long *) MPC5XXX_SDRAM_CTRL =
	    SDRAM_CONTROL | 0x80000000 | hi_addr_bit;
	__asm__ volatile ("sync");

	/* precharge all banks */
	*(vu_long *) MPC5XXX_SDRAM_CTRL =
	    SDRAM_CONTROL | 0x80000002 | hi_addr_bit;
	__asm__ volatile ("sync");

	/* set mode register: extended mode */
	*(vu_long *) MPC5XXX_SDRAM_MODE = SDRAM_EMODE;
	__asm__ volatile ("sync");

	/* set mode register: reset DLL */
	*(vu_long *) MPC5XXX_SDRAM_MODE = SDRAM_MODE | 0x04000000;
	__asm__ volatile ("sync");

	/* precharge all banks */
	*(vu_long *) MPC5XXX_SDRAM_CTRL =
	    SDRAM_CONTROL | 0x80000002 | hi_addr_bit;
	__asm__ volatile ("sync");

	/* auto refresh */
	*(vu_long *) MPC5XXX_SDRAM_CTRL =
	    SDRAM_CONTROL | 0x80000004 | hi_addr_bit;
	__asm__ volatile ("sync");

	/* set mode register */
	*(vu_long *) MPC5XXX_SDRAM_MODE = SDRAM_MODE;
	__asm__ volatile ("sync");

	/* normal operation */
	*(vu_long *) MPC5XXX_SDRAM_CTRL = SDRAM_CONTROL | hi_addr_bit;
	__asm__ volatile ("sync");
}

/*
 * ATTENTION: Although partially referenced initdram does NOT make real use
 *            use of CFG_SDRAM_BASE. The code does not work if CFG_SDRAM_BASE
 *            is something else than 0x00000000.
 */

long int initdram(int board_type)
{
	ulong dramsize = 0;
	ulong test1, test2;

	/* setup SDRAM chip selects */
	*(vu_long *) MPC5XXX_SDRAM_CS0CFG = 0x0000001e;	/* 2G at 0x0 */
	*(vu_long *) MPC5XXX_SDRAM_CS1CFG = 0x80000000;	/* disabled */
	__asm__ volatile ("sync");

	/* setup config registers */
	*(vu_long *) MPC5XXX_SDRAM_CONFIG1 = SDRAM_CONFIG1;
	*(vu_long *) MPC5XXX_SDRAM_CONFIG2 = SDRAM_CONFIG2;
	__asm__ volatile ("sync");

	/* set tap delay */
	*(vu_long *) MPC5XXX_CDM_PORCFG = SDRAM_TAPDELAY;
	__asm__ volatile ("sync");

	/* find RAM size using SDRAM CS0 only */
	sdram_start(0);
	test1 = get_ram_size((long *) CFG_SDRAM_BASE, 0x80000000);
	sdram_start(1);
	test2 = get_ram_size((long *) CFG_SDRAM_BASE, 0x80000000);

	if (test1 > test2) {
		sdram_start(0);
		dramsize = test1;
	} else {
		dramsize = test2;
	}

	/* memory smaller than 1MB is impossible */
	if (dramsize < (1 << 20)) {
		dramsize = 0;
	}

	/* set SDRAM CS0 size according to the amount of RAM found */
	if (dramsize > 0) {
		*(vu_long *) MPC5XXX_SDRAM_CS0CFG =
		    0x13 + __builtin_ffs(dramsize >> 20) - 1;
		/* let SDRAM CS1 start right after CS0 */
		*(vu_long *) MPC5XXX_SDRAM_CS1CFG = dramsize + 0x0000001e;	/* 2G */
	} else {
#if 0
		*(vu_long *) MPC5XXX_SDRAM_CS0CFG = 0;	/* disabled */
		/* let SDRAM CS1 start right after CS0 */
		*(vu_long *) MPC5XXX_SDRAM_CS1CFG = dramsize + 0x0000001e;	/* 2G */
#else
		*(vu_long *) MPC5XXX_SDRAM_CS0CFG =
		    0x13 + __builtin_ffs(0x08000000 >> 20) - 1;
		/* let SDRAM CS1 start right after CS0 */
		*(vu_long *) MPC5XXX_SDRAM_CS1CFG = 0x08000000 + 0x0000001e;	/* 2G */
#endif
	}

#if 0
	/* find RAM size using SDRAM CS1 only */
	sdram_start(0);
	get_ram_size((ulong *) (CFG_SDRAM_BASE + dramsize), 0x80000000);
	sdram_start(1);
	get_ram_size((ulong *) (CFG_SDRAM_BASE + dramsize), 0x80000000);
	sdram_start(0);
#endif
	/* set SDRAM CS1 size according to the amount of RAM found */

	*(vu_long *) MPC5XXX_SDRAM_CS1CFG = dramsize;	/* disabled */

	init_ata_reset();
	return (dramsize);
}

int checkboard(void)
{
	puts("Board: esd CPCI5200 (cpci5200)\n");
	return 0;
}

void flash_preinit(void)
{
	/*
	 * Now, when we are in RAM, enable flash write
	 * access for detection process.
	 * Note that CS_BOOT cannot be cleared when
	 * executing in flash.
	 */
	*(vu_long *) MPC5XXX_BOOTCS_CFG &= ~0x1;	/* clear RO */
}

void flash_afterinit(ulong size)
{
	if (size == 0x02000000) {
		/* adjust mapping */
		*(vu_long *) MPC5XXX_BOOTCS_START =
		    *(vu_long *) MPC5XXX_CS0_START =
		    START_REG(CFG_BOOTCS_START | size);
		*(vu_long *) MPC5XXX_BOOTCS_STOP =
		    *(vu_long *) MPC5XXX_CS0_STOP =
		    STOP_REG(CFG_BOOTCS_START | size, size);
	}
}

#ifdef	CONFIG_PCI
static struct pci_controller hose;

extern void pci_mpc5xxx_init(struct pci_controller *);

void pci_init_board(void
    ) {
	pci_mpc5xxx_init(&hose);
}
#endif

#if defined (CFG_CMD_IDE) && defined (CONFIG_IDE_RESET)

#define GPIO_PSC1_4	0x01000000UL

void init_ide_reset(void)
{
	debug("init_ide_reset\n");

	/* Configure PSC1_4 as GPIO output for ATA reset */
	*(vu_long *) MPC5XXX_WU_GPIO_ENABLE |= GPIO_PSC1_4;
	*(vu_long *) MPC5XXX_WU_GPIO_DIR |= GPIO_PSC1_4;
}

void ide_set_reset(int idereset)
{
	debug("ide_reset(%d)\n", idereset);

	if (idereset) {
		*(vu_long *) MPC5XXX_WU_GPIO_DATA &= ~GPIO_PSC1_4;
	} else {
		*(vu_long *) MPC5XXX_WU_GPIO_DATA |= GPIO_PSC1_4;
	}
}
#endif				/* defined (CFG_CMD_IDE) && defined (CONFIG_IDE_RESET) */

#define MPC5XXX_SIMPLEIO_GPIO_ENABLE       (MPC5XXX_GPIO + 0x0004)
#define MPC5XXX_SIMPLEIO_GPIO_DIR          (MPC5XXX_GPIO + 0x000C)
#define MPC5XXX_SIMPLEIO_GPIO_DATA_OUTPUT  (MPC5XXX_GPIO + 0x0010)
#define MPC5XXX_SIMPLEIO_GPIO_DATA_INPUT   (MPC5XXX_GPIO + 0x0014)

#define MPC5XXX_INTERRUPT_GPIO_ENABLE      (MPC5XXX_GPIO + 0x0020)
#define MPC5XXX_INTERRUPT_GPIO_DIR         (MPC5XXX_GPIO + 0x0028)
#define MPC5XXX_INTERRUPT_GPIO_DATA_OUTPUT (MPC5XXX_GPIO + 0x002C)
#define MPC5XXX_INTERRUPT_GPIO_STATUS      (MPC5XXX_GPIO + 0x003C)

#define GPIO_WU6	0x40000000UL
#define GPIO_USB0       0x00010000UL
#define GPIO_USB9       0x08000000UL
#define GPIO_USB9S      0x00080000UL

void init_ata_reset(void)
{
	debug("init_ata_reset\n");

	/* Configure GPIO_WU6 as GPIO output for ATA reset */
	*(vu_long *) MPC5XXX_WU_GPIO_DATA |= GPIO_WU6;
	*(vu_long *) MPC5XXX_WU_GPIO_ENABLE |= GPIO_WU6;
	*(vu_long *) MPC5XXX_WU_GPIO_DIR |= GPIO_WU6;
	__asm__ volatile ("sync");

	*(vu_long *) MPC5XXX_SIMPLEIO_GPIO_DATA_OUTPUT &= ~GPIO_USB0;
	*(vu_long *) MPC5XXX_SIMPLEIO_GPIO_ENABLE |= GPIO_USB0;
	*(vu_long *) MPC5XXX_SIMPLEIO_GPIO_DIR |= GPIO_USB0;
	__asm__ volatile ("sync");

	*(vu_long *) MPC5XXX_INTERRUPT_GPIO_DATA_OUTPUT &= ~GPIO_USB9;
	*(vu_long *) MPC5XXX_INTERRUPT_GPIO_ENABLE &= ~GPIO_USB9;
	__asm__ volatile ("sync");

	if ((*(vu_long *) MPC5XXX_INTERRUPT_GPIO_STATUS & GPIO_USB9S) == 0) {
		*(vu_long *) MPC5XXX_SIMPLEIO_GPIO_DATA_OUTPUT |= GPIO_USB0;
		__asm__ volatile ("sync");
	}
}

int do_writepci(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
	unsigned int addr;
	unsigned int size;
	int i;
	volatile unsigned long *ptr;

	addr = simple_strtol(argv[1], NULL, 16);
	size = simple_strtol(argv[2], NULL, 16);

	printf("\nWriting at addr %08x, size %08x.\n", addr, size);

	while (1) {
		ptr = (volatile unsigned long *)addr;
		for (i = 0; i < (size >> 2); i++) {
			*ptr++ = i;
		}

		/* Abort if ctrl-c was pressed */
		if (ctrlc()) {
			puts("\nAbort\n");
			return 0;
		}
		putc('.');
	}
	return 0;
}

U_BOOT_CMD(writepci, 3, 1, do_writepci,
	   "writepci- Write some data to pcibus\n",
	   "<addr> <size>\n" "        - Write some data to pcibus.\n");