board/v38b/v38b.c

/*
 * (C) Copyright 2003-2006
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * (C) Copyright 2004
 * Mark Jonas, Freescale Semiconductor, mark.jonas@motorola.com.
 *
 * 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 <mpc5xxx.h>
#include <asm/processor.h>


#ifndef CFG_RAMBOOT
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");

#if SDRAM_DDR
	/* 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");
#endif /* SDRAM_DDR */

	/* 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");
}
#endif /* !CFG_RAMBOOT */


long int initdram(int board_type)
{
	ulong dramsize = 0;
	ulong dramsize2 = 0;
	uint svr, pvr;

#ifndef CFG_RAMBOOT
	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");

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

	/* 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;
	else
		*(vu_long *) MPC5XXX_SDRAM_CS0CFG = 0; /* disabled */

	/* let SDRAM CS1 start right after CS0 */
	*(vu_long *) MPC5XXX_SDRAM_CS1CFG = dramsize + 0x0000001e;/* 2G */

	/* find RAM size using SDRAM CS1 only */
	if (!dramsize)
		sdram_start(0);
	test2 = test1 = get_ram_size((long *) (CFG_SDRAM_BASE + dramsize), 0x80000000);
	if (!dramsize) {
		sdram_start(1);
		test2 = get_ram_size((long *) (CFG_SDRAM_BASE + dramsize), 0x80000000);
	}
	if (test1 > test2) {
		sdram_start(0);
		dramsize2 = test1;
	} else
		dramsize2 = test2;

	/* memory smaller than 1MB is impossible */
	if (dramsize2 < (1 << 20))
		dramsize2 = 0;

	/* set SDRAM CS1 size according to the amount of RAM found */
	if (dramsize2 > 0)
		*(vu_long *) MPC5XXX_SDRAM_CS1CFG = dramsize
			| (0x13 + __builtin_ffs(dramsize2 >> 20) - 1);
	else
		*(vu_long *) MPC5XXX_SDRAM_CS1CFG = dramsize; /* disabled */

#else /* CFG_RAMBOOT */

	/* retrieve size of memory connected to SDRAM CS0 */
	dramsize = *(vu_long *) MPC5XXX_SDRAM_CS0CFG & 0xFF;
	if (dramsize >= 0x13)
		dramsize = (1 << (dramsize - 0x13)) << 20;
	else
		dramsize = 0;

	/* retrieve size of memory connected to SDRAM CS1 */
	dramsize2 = *(vu_long *) MPC5XXX_SDRAM_CS1CFG & 0xFF;
	if (dramsize2 >= 0x13)
		dramsize2 = (1 << (dramsize2 - 0x13)) << 20;
	else
		dramsize2 = 0;

#endif /* CFG_RAMBOOT */

	/*
	 * On MPC5200B we need to set the special configuration delay in the
	 * DDR controller. Please refer to Freescale's AN3221 "MPC5200B SDRAM
	 * Initialization and Configuration", 3.3.1 SDelay--MBAR + 0x0190:
	 *
	 * "The SDelay should be written to a value of 0x00000004. It is
	 * required to account for changes caused by normal wafer processing
	 * parameters."
	 */
	svr = get_svr();
	pvr = get_pvr();
	if ((SVR_MJREV(svr) >= 2) &&
		(PVR_MAJ(pvr) == 1) && (PVR_MIN(pvr) == 4)) {

		*(vu_long *) MPC5XXX_SDRAM_SDELAY = 0x04;
		__asm__ volatile ("sync");
	}

	return dramsize + dramsize2;
}


int checkboard (void)
{
	puts("Board: MarelV38B\n");
	return 0;
}


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

#ifdef CONFIG_HW_WATCHDOG
	/*
	 * Enable and configure the direction (output) of PSC3_9 - watchdog
	 * reset input. Refer to 7.3.2.2.[1,3,4] of the MPC5200B User's
	 * Manual.
	 */
	*(vu_long *) MPC5XXX_WU_GPIO_ENABLE |= GPIO_PSC3_9;
	*(vu_long *) MPC5XXX_WU_GPIO_DIR |= GPIO_PSC3_9;
#endif /* CONFIG_HW_WATCHDOG */

	/*
	 * Enable GPIO_WKUP_7 to "read the status of the actual power
	 * situation". Default direction is input, so no need to set it
	 * explicitly.
	 */
	*(vu_long *) MPC5XXX_WU_GPIO_ENABLE |= GPIO_WKUP_7;
	return 0;
}


#if defined (CFG_CMD_IDE) && defined (CONFIG_IDE_RESET)
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;
	/* Deassert reset */
	*(vu_long *) MPC5XXX_WU_GPIO_DATA_O |= GPIO_PSC1_4;
}


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

	if (idereset) {
		*(vu_long *) MPC5XXX_WU_GPIO_DATA_O &= ~GPIO_PSC1_4;
		/* Make a delay. MPC5200 spec says 25 usec min */
		udelay(500000);
	} else
		*(vu_long *) MPC5XXX_WU_GPIO_DATA_O |=  GPIO_PSC1_4;
}
#endif /* defined (CFG_CMD_IDE) && defined (CONFIG_IDE_RESET) */


#ifdef CONFIG_HW_WATCHDOG
void hw_watchdog_reset(void)
{
	/*
	 * MarelV38B has a TPS3705 watchdog. Spec says that to kick the dog
	 * we need a positive or negative transition on WDI i.e., our PSC3_9.
	 */
	*(vu_long *) MPC5XXX_WU_GPIO_DATA_O ^= GPIO_PSC3_9;
}
#endif /* CONFIG_HW_WATCHDOG */