/*
 * (C) Copyright 2003
 * MuLogic B.V.
 *
 * (C) Copyright 2002
 * Simple Network Magic Corporation, dnevil@snmc.com
 *
 * (C) Copyright 2000
 * 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 <asm/u-boot.h>
#include <commproc.h>
#include "mpc8xx.h"

/* ------------------------------------------------------------------------- */

static long  int dram_size (long int, long int *, long int);

/* ------------------------------------------------------------------------- */

const uint sdram_table[] =
{
        /*
         * Single Read. (Offset 0 in UPMA RAM)
         */
        0x1F07FC04, 0xEEAEFC04, 0x11ADFC04, 0xEFBBBC00,
        0x1FF77C47, 0x1FF77C35, 0xEFEABC34, 0x1FB57C35,
        /*
         * Burst Read. (Offset 8 in UPMA RAM)
         */
        0x1F07FC04, 0xEEAEFC04, 0x10ADFC04, 0xF0AFFC00,
        0xF0AFFC00, 0xF1AFFC00, 0xEFBBBC00, 0x1FF77C47,
        0xFFFFEC04, 0xFFFFEC04, 0xFFFFEC04, 0xFFFFEC04,
        0xFFFFEC04, 0xFFFFEC04, 0xFFFFEC04, 0xFFFFEC04,
        /*
         * Single Write. (Offset 18 in UPMA RAM)
         */
        0x1F27FC04, 0xEEAEBC00, 0x01B93C04, 0x1FF77C47,
        0xFFFFEC04, 0xFFFFEC04, 0xFFFFEC04, 0xFFFFEC04,
        /*
         * Burst Write. (Offset 20 in UPMA RAM)
         */
        0x1F07FC04, 0xEEAEBC00, 0x10AD7C00, 0xF0AFFC00,
        0xF0AFFC00, 0xE1BBBC04, 0x1FF77C47, 0xFFFFEC04,
        0xFFFFEC04, 0xFFFFEC04, 0xFFFFEC04, 0xFFFFEC04,
        0xFFFFEC04, 0xFFFFEC04, 0xFFFFEC04, 0xFFFFEC04,
        /*
         * Refresh  (Offset 30 in UPMA RAM)
         */
        0x1FF5FC84, 0xFFFFFC04, 0xFFFFFC04, 0xFFFFFC04,
        0xFFFFFC84, 0xFFFFFC07, 0xFFFFEC04, 0xFFFFEC04,
        0xFFFFEC04, 0xFFFFEC04, 0xFFFFEC04, 0xFFFFEC04,
        /*
         * Exception. (Offset 3c in UPMA RAM)
         */
        0x7FFFFC07, 0xFFFFEC04, 0xFFFFEC04, 0xFFFFEC04
};

/* ------------------------------------------------------------------------- */


/*
 * Check Board Identity:
 *
 * Test ID string (QS860T...)
 *
 * Always return 1
 */

int checkboard (void)
{
        char *s, *e;
        char buf[64];
        int i;

        i = getenv_f("serial#", buf, sizeof(buf));
        s = (i>0) ? buf : NULL;

        if (!s || strncmp(s, "QS860T", 6)) {
                puts ("### No HW ID - assuming QS860T");
        } else {
                for (e=s; *e; ++e) {
                        if (*e == ' ')
                        break;
                }

                for ( ; s<e; ++s) {
                        putc (*s);
                }
        }
        putc ('\n');

        return (0);
}

/* ------------------------------------------------------------------------- */

phys_size_t initdram (int board_type)
{
        volatile immap_t     *immap  = (immap_t *)CONFIG_SYS_IMMR;
        volatile memctl8xx_t *memctl = &immap->im_memctl;
        long int size;

        upmconfig(UPMB, (uint *)sdram_table, sizeof(sdram_table)/sizeof(uint));

        /*
        * Prescaler for refresh
        */
        memctl->memc_mptpr = 0x0400;

        /*
        * Map controller bank 2 to the SDRAM address
        */
        memctl->memc_or2 = CONFIG_SYS_OR2;
        memctl->memc_br2 = CONFIG_SYS_BR2;
        udelay(200);

        /* perform SDRAM initialization sequence */
        memctl->memc_mbmr = CONFIG_SYS_16M_MBMR;
        udelay(100);

        memctl->memc_mar  = 0x00000088;
        memctl->memc_mcr  = 0x80804105; /* run precharge pattern */
        udelay(1);

        /* Run two refresh cycles on SDRAM */
        memctl->memc_mbmr = 0x18802118;
        memctl->memc_mcr  = 0x80804130;
        memctl->memc_mbmr = 0x18802114;
        memctl->memc_mcr  = 0x80804106;

        udelay (1000);

#if 0
        /*
        * Check for 64M SDRAM Memory Size
        */
        size = dram_size (CONFIG_SYS_64M_MBMR, (ulong *)SDRAM_BASE, SDRAM_64M_MAX_SIZE);
        udelay (1000);

        /*
        * Check for 16M SDRAM Memory Size
        */
        if (size != SDRAM_64M_MAX_SIZE) {
#endif
        size = dram_size (CONFIG_SYS_16M_MBMR, (long *)SDRAM_BASE, SDRAM_16M_MAX_SIZE);
        udelay (1000);
#if 0
        }

        memctl->memc_or2 = ((-size) & 0xFFFF0000) | SDRAM_TIMING;
#endif


        udelay(10000);


#if 0

        /*
        * Also, map other memory to correct position
        */

        /*
        * Map the 8M Intel Flash device to chip select 1
        */
        memctl->memc_or1 = CONFIG_SYS_OR1;
        memctl->memc_br1 = CONFIG_SYS_BR1;


        /*
        * Map 64K NVRAM, Sipex Device, NAND Ctl Reg, and LED Ctl Reg
        * to chip select 3
        */
        memctl->memc_or3 = CONFIG_SYS_OR3;
        memctl->memc_br3 = CONFIG_SYS_BR3;

        /*
        * Map chip selects 4, 5, 6, & 7 for external expansion connector
        */
        memctl->memc_or4 = CONFIG_SYS_OR4;
        memctl->memc_br4 = CONFIG_SYS_BR4;

        memctl->memc_or5 = CONFIG_SYS_OR5;
        memctl->memc_br5 = CONFIG_SYS_BR5;

        memctl->memc_or6 = CONFIG_SYS_OR6;
        memctl->memc_br6 = CONFIG_SYS_BR6;

        memctl->memc_or7 = CONFIG_SYS_OR7;
        memctl->memc_br7 = CONFIG_SYS_BR7;

#endif

        return (size);
}

/* ------------------------------------------------------------------------- */

/*
 * Check memory range for valid RAM. A simple memory test determines
 * the actually available RAM size between addresses `base' and
 * `base + maxsize'. Some (not all) hardware errors are detected:
 * - short between address lines
 * - short between data lines
 */

static long int dram_size (long int mbmr_value, long int *base, long int maxsize)
{
        volatile immap_t *immap  = (immap_t *)CONFIG_SYS_IMMR;
        volatile memctl8xx_t *memctl = &immap->im_memctl;

        memctl->memc_mbmr = mbmr_value;

        return (get_ram_size(base, maxsize));
}