/*
 * (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 <mpc8xx.h>
#include "fpga.h"

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

static long int dram_size (long int, long int *, long int);
unsigned long flash_init (void);

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

#define _NOT_USED_      0xFFFFCC25

const uint sdram_table[] = {
        /*
         * Single Read. (Offset 00h in UPMA RAM)
         */
        0x0F03CC04, 0x00ACCC24, 0x1FF74C20, _NOT_USED_,
        _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,

        /*
         * Burst Read. (Offset 08h in UPMA RAM)
         */
        0x0F03CC04, 0x00ACCC24, 0x00FFCC20, 0x00FFCC20,
        0x01FFCC20, 0x1FF74C20, _NOT_USED_, _NOT_USED_,
        _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
        _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,

        /*
         * Single Write. (Offset 18h in UPMA RAM)
         */
        0x0F03CC02, 0x00AC0C24, 0x1FF74C25, _NOT_USED_,
        _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,

        /*
         * Burst Write. (Offset 20h in UPMA RAM)
         */
        0x0F03CC00, 0x00AC0C20, 0x00FFFC20, 0x00FFFC22,
        0x01FFFC24, 0x1FF74C25, _NOT_USED_, _NOT_USED_,
        _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
        _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,

        /*
         * Refresh. (Offset 30h in UPMA RAM)
         * (Initialization code at 0x36)
         */
        0x0FF0CC24, 0xFFFFCC24, _NOT_USED_, _NOT_USED_,
        _NOT_USED_, _NOT_USED_, 0xEFFB8C34, 0x0FF74C34,
        0x0FFACCB4, 0x0FF5CC34, 0x0FFCC34, 0x0FFFCCB4,

        /*
         * Exception. (Offset 3Ch in UPMA RAM)
         */
        0x0FEA8C34, 0x1FB54C34, 0xFFFFCC34, _NOT_USED_
};

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


/*
 * Check Board Identity:
 */

int checkboard (void)
{
        char *s = getenv ("serial#");

        puts ("Board QUANTUM, Serial No: ");

        for (; s && *s; ++s) {
                if (*s == ' ')
                        break;
                putc (*s);
        }
        putc ('\n');
        return (0);             /* success */
}

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

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 size9;

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

        /* Refresh clock prescalar */
        memctl->memc_mptpr = CONFIG_SYS_MPTPR;

        memctl->memc_mar = 0x00000088;

        /* Map controller banks 1 to the SDRAM bank */
        memctl->memc_or1 = CONFIG_SYS_OR1_PRELIM;
        memctl->memc_br1 = CONFIG_SYS_BR1_PRELIM;

        memctl->memc_mamr = CONFIG_SYS_MAMR_9COL & (~(MAMR_PTAE));      /* no refresh yet */

        udelay (200);

        /* perform SDRAM initializsation sequence */

        memctl->memc_mcr = 0x80002136;  /* SDRAM bank 0 */
        udelay (1);

        memctl->memc_mamr |= MAMR_PTAE; /* enable refresh */

        udelay (1000);

        /* Check Bank 0 Memory Size,
         * 9 column mode
         */
        size9 = dram_size (CONFIG_SYS_MAMR_9COL, (long *) SDRAM_BASE_PRELIM,
                           SDRAM_MAX_SIZE);
        /*
         * Final mapping:
         */
        memctl->memc_or1 = ((-size9) & 0xFFFF0000) | CONFIG_SYS_OR_TIMING_SDRAM;
        udelay (1000);

        return (size9);
}

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

/*
 * 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 mamr_value, long int *base,
                           long int maxsize)
{
        volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
        volatile memctl8xx_t *memctl = &immap->im_memctl;
        volatile ulong *addr;
        ulong cnt, val, size;
        ulong save[32];         /* to make test non-destructive */
        unsigned char i = 0;

        memctl->memc_mamr = mamr_value;

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

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

        /* write 0 to base address */
        addr = (volatile ulong *)base;
        save[i] = *addr;
        *addr = 0;

        /* check at base address */
        if ((val = *addr) != 0) {
                /* Restore the original data before leaving the function.
                 */
                *addr = save[i];
                for (cnt = 1; cnt <= maxsize / sizeof (long); cnt <<= 1) {
                        addr = (volatile ulong *) base + cnt;
                        *addr = save[--i];
                }
                return (0);
        }

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

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

                if (val != (~cnt)) {
                        size = cnt * sizeof (long);
                        /* Restore the original data before returning
                         */
                        for (cnt <<= 1; cnt <= maxsize / sizeof (long);
                             cnt <<= 1) {
                                addr = (volatile ulong *) base + cnt;
                                *addr = save[--i];
                        }
                        return (size);
                }
        }
        return (maxsize);
}

/*
 * Miscellaneous intialization
 */
int misc_init_r (void)
{
        char *fpga_data_str = getenv ("fpgadata");
        char *fpga_size_str = getenv ("fpgasize");
        void *fpga_data;
        int fpga_size;
        int status;
        volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
        volatile memctl8xx_t *memctl = &immap->im_memctl;
        int flash_size;

        /* Remap FLASH according to real size */
        flash_size = flash_init ();
        memctl->memc_or0 = CONFIG_SYS_OR_TIMING_FLASH | (-flash_size & 0xFFFF8000);
        memctl->memc_br0 = (CONFIG_SYS_FLASH_BASE & BR_BA_MSK) | BR_MS_GPCM | BR_V;

        if (fpga_data_str && fpga_size_str) {
                fpga_data = (void *) simple_strtoul (fpga_data_str, NULL, 16);
                fpga_size = simple_strtoul (fpga_size_str, NULL, 10);

                status = fpga_boot (fpga_data, fpga_size);
                if (status != 0) {
                        printf ("\nFPGA: Booting failed ");
                        switch (status) {
                        case ERROR_FPGA_PRG_INIT_LOW:
                                printf ("(Timeout: INIT not low after asserting PROGRAM*)\n ");
                                break;
                        case ERROR_FPGA_PRG_INIT_HIGH:
                                printf ("(Timeout: INIT not high after deasserting PROGRAM*)\n ");
                                break;
                        case ERROR_FPGA_PRG_DONE:
                                printf ("(Timeout: DONE not high after programming FPGA)\n ");
                                break;
                        }
                }
        }
        return 0;
}