source: SVN/rincon/u-boot/board/amcc/bamboo/flash.c @ 55

/*
 * (C) Copyright 2004-2005
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * (C) Copyright 2002 Jun Gu <jung@artesyncp.com>
 * Add support for Am29F016D and dynamic switch setting.
 *
 * 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
 */

/*
 * Modified 4/5/2001
 * Wait for completion of each sector erase command issued
 * 4/5/2001
 * Chris Hallinan - DS4.COM, Inc. - clh@net1plus.com
 */

#include <common.h>
#include <ppc4xx.h>
#include <asm/processor.h>
#include <ppc440.h>
#include "bamboo.h"

#undef DEBUG

#ifdef DEBUG
#define DEBUGF(x...) printf(x)
#else
#define DEBUGF(x...)
#endif                          /* DEBUG */

flash_info_t flash_info[CFG_MAX_FLASH_BANKS];   /* info for FLASH chips        */

/*
 * Mark big flash bank (16 bit instead of 8 bit access) in address with bit 0
 */
static unsigned long flash_addr_table[][CFG_MAX_FLASH_BANKS] = {
        {0x87800001, 0xFFF00000, 0xFFF80000}, /* 0:boot from small flash */
        {0x00000000, 0x00000000, 0x00000000}, /* 1:boot from pci 66      */
        {0x87800001, 0x00000000, 0x00000000}, /* 0:boot from nand flash  */
        {0x87F00000, 0x87F80000, 0xFFC00001}, /* 3:boot from big flash 33*/
        {0x87F00000, 0x87F80000, 0xFFC00001}, /* 4:boot from big flash 66*/
        {0x00000000, 0x00000000, 0x00000000}, /* 5:boot from             */
        {0x00000000, 0x00000000, 0x00000000}, /* 6:boot from pci 66      */
        {0x00000000, 0x00000000, 0x00000000}, /* 7:boot from             */
        {0x87C00001, 0xFFF00000, 0xFFF80000}, /* 0:boot from small flash */
};

/*
 * include common flash code (for amcc boards)
 */
#include "../common/flash.c"

/*-----------------------------------------------------------------------
 * Functions
 */
static ulong flash_get_size(vu_long * addr, flash_info_t * info);
static int write_word(flash_info_t * info, ulong dest, ulong data);

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

unsigned long flash_init(void)
{
        unsigned long total_b = 0;
        unsigned long size_b[CFG_MAX_FLASH_BANKS];
        unsigned short index = 0;
        int i;
        unsigned long val;
        unsigned long ebc_boot_size;
        unsigned long boot_selection;

        mfsdr(sdr_pstrp0, val);
        index = (val & SDR0_PSTRP0_BOOTSTRAP_MASK) >> 29;

        if ((index == 5) || (index == 7)) {
                /*
                 * Boot Settings in IIC EEprom address 0xA8 or 0xA4
                 * Read Serial Device Strap Register1 in PPC440EP
                 */
                mfsdr(sdr_sdstp1, val);
                boot_selection  = val & SDR0_SDSTP1_BOOT_SEL_MASK;
                ebc_boot_size   = val & SDR0_SDSTP1_EBC_ROM_BS_MASK;

                switch(boot_selection) {
                case SDR0_SDSTP1_BOOT_SEL_EBC:
                        switch(ebc_boot_size) {
                        case SDR0_SDSTP1_EBC_ROM_BS_16BIT:
                                index = 3;
                                break;
                        case SDR0_SDSTP1_EBC_ROM_BS_8BIT:
                                index = 0;
                                break;
                        }
                        break;

                case SDR0_SDSTP1_BOOT_SEL_PCI:
                        index = 1;
                        break;

                case SDR0_SDSTP1_BOOT_SEL_NDFC:
                        index = 2;
                        break;
                }
        } else if (index == 0) {
                if (in8(FPGA_SETTING_REG) & FPGA_SET_REG_OP_CODE_FLASH_ABOVE) {
                        index = 8; /* sram below op code flash -> new index 8 */
                }
        }

        DEBUGF("\n");
        DEBUGF("FLASH: Index: %d\n", index);

        /* Init: no FLASHes known */
        for (i = 0; i < CFG_MAX_FLASH_BANKS; ++i) {
                flash_info[i].flash_id = FLASH_UNKNOWN;
                flash_info[i].sector_count = -1;
                flash_info[i].size = 0;

                /* check whether the address is 0 */
                if (flash_addr_table[index][i] == 0)
                        continue;

                DEBUGF("Detection bank %d...\n", i);
                /* call flash_get_size() to initialize sector address */
                size_b[i] = flash_get_size((vu_long *) flash_addr_table[index][i],
                                   &flash_info[i]);
                flash_info[i].size = size_b[i];
                if (flash_info[i].flash_id == FLASH_UNKNOWN) {
                        printf("## Unknown FLASH on Bank %d - Size = 0x%08lx = %ld MB\n",
                               i, size_b[i], size_b[i] << 20);
                        flash_info[i].sector_count = -1;
                        flash_info[i].size = 0;
                }

                /* Monitor protection ON by default */
                (void)flash_protect(FLAG_PROTECT_SET, CFG_MONITOR_BASE,
                                    CFG_MONITOR_BASE + CFG_MONITOR_LEN - 1,
                                    &flash_info[i]);
#if defined(CONFIG_ENV_IS_IN_FLASH)
                (void)flash_protect(FLAG_PROTECT_SET, CONFIG_ENV_ADDR,
                                    CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1,
                                    &flash_info[i]);
#if defined(CONFIG_ENV_IS_IN_FLASH) && defined(CONFIG_ENV_ADDR_REDUND)
                (void)flash_protect(FLAG_PROTECT_SET, CONFIG_ENV_ADDR_REDUND,
                                    CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1,
                                    &flash_info[i]);
#endif
#endif

                total_b += flash_info[i].size;
        }

        return total_b;
}