/*
 * (C) Copyright 2003
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * 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 <pci.h>

#ifndef CFG_RAMBOOT
static long int dram_size(long int *base, long int maxsize)
{
	volatile long int *addr;
	ulong cnt, val;
	ulong save[32];			/* to make test non-destructive */
	unsigned char i = 0;

	for (cnt = (maxsize / sizeof (long)) >> 1; cnt > 0; cnt >>= 1) {
		addr = base + cnt;		/* pointer arith! */

		save[i++] = *addr;
		*addr = ~cnt;
	}

	/* write 0 to base address */
	addr = base;
	save[i] = *addr;
	*addr = 0;

	/* check at base address */
	if ((val = *addr) != 0) {
		*addr = save[i];
		return (0);
	}

	for (cnt = 1; cnt < maxsize / sizeof (long); cnt <<= 1) {
		addr = base + cnt;		/* pointer arith! */

		val = *addr;
		*addr = save[--i];

		if (val != (~cnt)) {
			return (cnt * sizeof (long));
		}
	}
	return (maxsize);
}

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

	/* unlock mode register */
	*(vu_long *)MPC5XXX_SDRAM_CTRL = 0xd04f0000 | hi_addr_bit;
	/* precharge all banks */
	*(vu_long *)MPC5XXX_SDRAM_CTRL = 0xd04f0002 | hi_addr_bit;
	/* set mode register */
#if defined(CONFIG_MPC5200)
	*(vu_long *)MPC5XXX_SDRAM_MODE = 0x408d0000;
#elif defined(CONFIG_MGT5100)
	*(vu_long *)MPC5XXX_SDRAM_MODE = 0x008d0000;
#endif
	/* precharge all banks */
	*(vu_long *)MPC5XXX_SDRAM_CTRL = 0xd04f0002 | hi_addr_bit;
	/* auto refresh */
	*(vu_long *)MPC5XXX_SDRAM_CTRL = 0xd04f0004 | hi_addr_bit;
	/* set mode register */
	*(vu_long *)MPC5XXX_SDRAM_MODE = 0x008d0000;
	/* normal operation */
	*(vu_long *)MPC5XXX_SDRAM_CTRL = 0x504f0000 | hi_addr_bit;
}
#endif

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

	/* configure SDRAM start/end */
#if defined(CONFIG_MPC5200)
	*(vu_long *)MPC5XXX_SDRAM_CS0CFG = 0x0000001e;/* 2G at 0x0 */
	*(vu_long *)MPC5XXX_SDRAM_CS1CFG = 0x80000000;/* disabled */

	/* setup config registers */
	*(vu_long *)MPC5XXX_SDRAM_CONFIG1 = 0xc2233a00;
	*(vu_long *)MPC5XXX_SDRAM_CONFIG2 = 0x88b70004;

#elif defined(CONFIG_MGT5100)
	*(vu_long *)MPC5XXX_SDRAM_START = 0x00000000;
	*(vu_long *)MPC5XXX_SDRAM_STOP = 0x0000ffff;/* 2G */
	*(vu_long *)MPC5XXX_ADDECR |= (1 << 22); /* Enable SDRAM */

	/* setup config registers */
	*(vu_long *)MPC5XXX_SDRAM_CONFIG1 = 0xc2222600;
	*(vu_long *)MPC5XXX_SDRAM_CONFIG2 = 0x88b70004;

	/* address select register */
	*(vu_long *)MPC5XXX_SDRAM_XLBSEL = 0x03000000;
#endif
	sdram_start(0);
	test1 = dram_size((ulong *)CFG_SDRAM_BASE, 0x80000000);
	sdram_start(1);
	test2 = dram_size((ulong *)CFG_SDRAM_BASE, 0x80000000);
	if (test1 > test2) {
		sdram_start(0);
		dramsize = test1;
	} else {
		dramsize = test2;
	}
#if defined(CONFIG_MPC5200)
	*(vu_long *)MPC5XXX_SDRAM_CS0CFG =
		(0x13 + __builtin_ffs(dramsize >> 20) - 1);
	*(vu_long *)MPC5XXX_SDRAM_CS1CFG = dramsize; /* disabled */
#elif defined(CONFIG_MGT5100)
	*(vu_long *)MPC5XXX_SDRAM_STOP = ((dramsize - 1) >> 15);
#endif

#else
#ifdef CONFIG_MGT5100
	*(vu_long *)MPC5XXX_ADDECR |= (1 << 22); /* Enable SDRAM */
	dramsize = ((*(vu_long *)MPC5XXX_SDRAM_STOP + 1) << 15);
#else
	dramsize = ((1 << (*(vu_long *)MPC5XXX_SDRAM_CS0CFG - 0x13)) << 20);
#endif
#endif /* CFG_RAMBOOT */
	/* return total ram size */
	return dramsize;
}

int checkboard (void)
{
#if defined(CONFIG_MPC5200)
	puts ("Board: Motorola MPC5200 (IceCube)\n");
#elif defined(CONFIG_MGT5100)
	puts ("Board: Motorola MGT5100 (IceCube)\n");
#endif
	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.
	 */
#if defined(CONFIG_MGT5100)
	*(vu_long *)MPC5XXX_ADDECR &= ~(1 << 25); /* disable CS_BOOT */
	*(vu_long *)MPC5XXX_ADDECR |= (1 << 16); /* enable CS0 */
#endif
	*(vu_long *)MPC5XXX_BOOTCS_CFG &= ~0x1; /* clear RO */
}

#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