cfi_flash_new: generate flash erase dots in common function

[barebox-mini2440.git] / drivers / nor / cfi_flash_new.c

/*
 * (C) Copyright 2002-2004
 * Brad Kemp, Seranoa Networks, Brad.Kemp@seranoa.com
 *
 * Copyright (C) 2003 Arabella Software Ltd.
 * Yuli Barcohen <yuli@arabellasw.com>
 *
 * Copyright (C) 2004
 * Ed Okerson
 *
 * Copyright (C) 2006
 * Tolunay Orkun <listmember@orkun.us>
 *
 * 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
 *
 */

/* The DEBUG define must be before common to enable debugging */
/* #define DEBUG        */

#include <common.h>
#include <asm/byteorder.h>
#include <environment.h>
#include <clock.h>
#include <init.h>
#include <malloc.h>
#include <cfi_flash_new.h>
#include <asm/io.h>
#include <errno.h>

/*
 * This file implements a Common Flash Interface (CFI) driver for barebox.
 * The width of the port and the width of the chips are determined at initialization.
 * These widths are used to calculate the address for access CFI data structures.
 *
 * References
 * JEDEC Standard JESD68 - Common Flash Interface (CFI)
 * JEDEC Standard JEP137-A Common Flash Interface (CFI) ID Codes
 * Intel Application Note 646 Common Flash Interface (CFI) and Command Sets
 * Intel 290667-008 3 Volt Intel StrataFlash Memory datasheet
 * AMD CFI Specification, Release 2.0 December 1, 2001
 * AMD/Spansion Application Note: Migration from Single-byte to Three-byte
 *   Device IDs, Publication Number 25538 Revision A, November 8, 2001
 *
 */

#define NUM_ERASE_REGIONS       4 /* max. number of erase regions */

static uint flash_offset_cfi[2]={FLASH_OFFSET_CFI,FLASH_OFFSET_CFI_ALT};

/*
 * Check if chip width is defined. If not, start detecting with 8bit.
 */
#ifndef CFG_FLASH_CFI_WIDTH
#define CFG_FLASH_CFI_WIDTH     FLASH_CFI_8BIT
#endif


/*
 * Functions
 */

static void flash_add_byte (flash_info_t * info, cfiword_t * cword, uchar c)
{
#if defined(__LITTLE_ENDIAN)
        unsigned short  w;
        unsigned int    l;
        unsigned long long ll;
#endif

        if (bankwidth_is_1(info)) {
                cword->c = c;
        } else if (bankwidth_is_2(info)) {
#if defined(__LITTLE_ENDIAN)
                w = c;
                w <<= 8;
                cword->w = (cword->w >> 8) | w;
#else
                cword->w = (cword->w << 8) | c;
#endif
        } else if (bankwidth_is_4(info)) {
#if defined(__LITTLE_ENDIAN)
                l = c;
                l <<= 24;
                cword->l = (cword->l >> 8) | l;
#else
                cword->l = (cword->l << 8) | c;
#endif
        } else if (bankwidth_is_8(info)) {
#if defined(__LITTLE_ENDIAN)
                ll = c;
                ll <<= 56;
                cword->ll = (cword->ll >> 8) | ll;
#else
                cword->ll = (cword->ll << 8) | c;
#endif
        }
}

static int flash_write_cfiword (flash_info_t * info, ulong dest,
                                cfiword_t cword)
{
        cfiptr_t ctladdr;
        cfiptr_t cptr;
        int flag;

        ctladdr.cp = flash_make_addr (info, 0, 0);
        cptr.cp = (uchar *) dest;


        /* Check if Flash is (sufficiently) erased */
        if (bankwidth_is_1(info)) {
                flag = ((cptr.cp[0] & cword.c) == cword.c);
        } else if (bankwidth_is_2(info)) {
                flag = ((cptr.wp[0] & cword.w) == cword.w);
        } else if (bankwidth_is_4(info)) {
                flag = ((cptr.lp[0] & cword.l) == cword.l);
        } else if (bankwidth_is_8(info)) {
                flag = ((cptr.llp[0] & cword.ll) == cword.ll);
        } else
                return 2;

        if (!flag)
                return 2;

        /* Disable interrupts which might cause a timeout here */
//      flag = disable_interrupts ();

        info->cfi_cmd_set->flash_prepare_write(info);

        if (bankwidth_is_1(info)) {
                cptr.cp[0] = cword.c;
        } else if (bankwidth_is_2(info)) {
                cptr.wp[0] = cword.w;
        } else if (bankwidth_is_4(info)) {
                cptr.lp[0] = cword.l;
        } else if (bankwidth_is_8(info)) {
                cptr.llp[0] = cword.ll;
        }

        /* re-enable interrupts if necessary */
        if (flag)
                enable_interrupts ();

        return flash_status_check (info, find_sector (info, dest),
                                        info->write_tout, "write");
}

#ifdef DEBUG
/*
 * Debug support
 */
void print_longlong (char *str, unsigned long long data)
{
        int i;
        char *cp;

        cp = (unsigned char *) &data;
        for (i = 0; i < 8; i++)
                sprintf (&str[i * 2], "%2.2x", *cp++);
}

static void flash_printqry (flash_info_t * info, flash_sect_t sect)
{
        cfiptr_t cptr;
        int x, y;

        for (x = 0; x < 0x40; x += 16U / info->portwidth) {
                cptr.cp =
                        flash_make_addr (info, sect,
                                         x + FLASH_OFFSET_CFI_RESP);
                debug ("%p : ", cptr.cp);
                for (y = 0; y < 16; y++) {
                        debug ("%2.2x ", cptr.cp[y]);
                }
                debug (" ");
                for (y = 0; y < 16; y++) {
                        if (cptr.cp[y] >= 0x20 && cptr.cp[y] <= 0x7e) {
                                debug ("%c", cptr.cp[y]);
                        } else {
                                debug (".");
                        }
                }
                debug ("\n");
        }
}
#endif

/*
 * read a short word by swapping for ppc format.
 */
static ushort flash_read_ushort (flash_info_t * info, flash_sect_t sect, uint offset)
{
        uchar *addr;
        ushort retval;

#ifdef DEBUG
        int x;
#endif
        addr = flash_make_addr (info, sect, offset);

#ifdef DEBUG
        debug ("ushort addr is at %p info->portwidth = %d\n", addr,
               info->portwidth);
        for (x = 0; x < 2 * info->portwidth; x++) {
                debug ("addr[%x] = 0x%x\n", x, addr[x]);
        }
#endif
#if defined(__LITTLE_ENDIAN)
        retval = ((addr[(info->portwidth)] << 8) | addr[0]);
#else
        retval = ((addr[(2 * info->portwidth) - 1] << 8) |
                  addr[info->portwidth - 1]);
#endif

        debug ("retval = 0x%x\n", retval);
        return retval;
}

/*
 * read a long word by picking the least significant byte of each maximum
 * port size word. Swap for ppc format.
 */
static ulong flash_read_long (flash_info_t * info, flash_sect_t sect, uint offset)
{
        uchar *addr;
        ulong retval;

#ifdef DEBUG
        int x;
#endif
        addr = flash_make_addr (info, sect, offset);

#ifdef DEBUG
        debug ("long addr is at %p info->portwidth = %d\n", addr,
               info->portwidth);
        for (x = 0; x < 4 * info->portwidth; x++) {
                debug ("addr[%x] = 0x%x\n", x, addr[x]);
        }
#endif
#if defined(__LITTLE_ENDIAN)
        retval = (addr[0] << 16) | (addr[(info->portwidth)] << 24) |
                (addr[(2 * info->portwidth)]) | (addr[(3 * info->portwidth)] << 8);
#else
        retval = (addr[(2 * info->portwidth) - 1] << 24) |
                (addr[(info->portwidth) - 1] << 16) |
                (addr[(4 * info->portwidth) - 1] << 8) |
                addr[(3 * info->portwidth) - 1];
#endif
        return retval;
}

/*
 * detect if flash is compatible with the Common Flash Interface (CFI)
 * http://www.jedec.org/download/search/jesd68.pdf
 *
*/
static int flash_detect_cfi (flash_info_t * info)
{
        int cfi_offset;
        debug ("flash detect cfi\n");

        for (info->portwidth = CFG_FLASH_CFI_WIDTH;
             info->portwidth <= FLASH_CFI_64BIT; info->portwidth <<= 1) {
                for (info->chipwidth = FLASH_CFI_BY8;
                     info->chipwidth <= info->portwidth;
                     info->chipwidth <<= 1) {
                        flash_write_cmd (info, 0, 0, info->cmd_reset);
                        for (cfi_offset=0; cfi_offset < sizeof(flash_offset_cfi)/sizeof(uint); cfi_offset++) {
                                flash_write_cmd (info, 0, flash_offset_cfi[cfi_offset], FLASH_CMD_CFI);
                                if (flash_isequal (info, 0, FLASH_OFFSET_CFI_RESP, 'Q')
                                 && flash_isequal (info, 0, FLASH_OFFSET_CFI_RESP + 1, 'R')
                                 && flash_isequal (info, 0, FLASH_OFFSET_CFI_RESP + 2, 'Y')) {
                                        info->interface = flash_read_ushort (info, 0, FLASH_OFFSET_INTERFACE);
                                        info->cfi_offset=flash_offset_cfi[cfi_offset];
                                        debug ("device interface is %d\n",
                                                info->interface);
                                        debug ("found port %d chip %d ",
                                                info->portwidth, info->chipwidth);
                                        debug ("port %d bits chip %d bits\n",
                                                info->portwidth << CFI_FLASH_SHIFT_WIDTH,
                                                info->chipwidth << CFI_FLASH_SHIFT_WIDTH);
                                        return 1;
                                }
                        }
                }
        }
        debug ("not found\n");
        return 0;
}

/*
 * The following code cannot be run from FLASH!
 */
static ulong flash_get_size (flash_info_t *info, ulong base)
{
        int i, j;
        flash_sect_t sect_cnt;
        unsigned long sector;
        unsigned long tmp;
        int size_ratio;
        uchar num_erase_regions;
        int erase_region_size;
        int erase_region_count;
        int geometry_reversed = 0;

        info->ext_addr = 0;
        info->cfi_version = 0;
#ifdef CFG_FLASH_PROTECTION
        info->legacy_unlock = 0;
#endif

        /* first only malloc space for the first sector */
        info->start = malloc(sizeof(ulong));

        info->start[0] = base;
        info->protect = 0;

        if (flash_detect_cfi (info)) {
                info->vendor = flash_read_ushort (info, 0,
                                        FLASH_OFFSET_PRIMARY_VENDOR);
                switch (info->vendor) {
#ifdef CONFIG_DRIVER_CFI_INTEL
                case CFI_CMDSET_INTEL_EXTENDED:
                case CFI_CMDSET_INTEL_STANDARD:
                        info->cfi_cmd_set = &cfi_cmd_set_intel;
                        break;
#endif
#ifdef CONFIG_DRIVER_CFI_AMD
                case CFI_CMDSET_AMD_STANDARD:
                case CFI_CMDSET_AMD_EXTENDED:
                        info->cfi_cmd_set = &cfi_cmd_set_amd;
                        break;
#endif
                default:
                        printf("unsupported vendor\n");
                        return 0;
                }
                info->cfi_cmd_set->flash_read_jedec_ids (info);
                flash_write_cmd (info, 0, info->cfi_offset, FLASH_CMD_CFI);
                num_erase_regions = flash_read_uchar (info,
                                        FLASH_OFFSET_NUM_ERASE_REGIONS);
                info->ext_addr = flash_read_ushort (info, 0,
                                        FLASH_OFFSET_EXT_QUERY_T_P_ADDR);
                if (info->ext_addr) {
                        info->cfi_version = (ushort) flash_read_uchar (info,
                                                info->ext_addr + 3) << 8;
                        info->cfi_version |= (ushort) flash_read_uchar (info,
                                                info->ext_addr + 4);
                }
#ifdef DEBUG
                flash_printqry (info, 0);
#endif
                switch (info->vendor) {
                case CFI_CMDSET_INTEL_STANDARD:
                case CFI_CMDSET_INTEL_EXTENDED:
                default:
                        info->cmd_reset = FLASH_CMD_RESET;
#ifdef CFG_FLASH_PROTECTION
                        /* read legacy lock/unlock bit from intel flash */
                        if (info->ext_addr) {
                                info->legacy_unlock = flash_read_uchar (info,
                                                info->ext_addr + 5) & 0x08;
                        }
#endif
                        break;
                case CFI_CMDSET_AMD_STANDARD:
                case CFI_CMDSET_AMD_EXTENDED:
                        info->cmd_reset = AMD_CMD_RESET;
                        /* check if flash geometry needs reversal */
                        if (num_erase_regions <= 1)
                                break;
                        /* reverse geometry if top boot part */
                        if (info->cfi_version < 0x3131) {
                                /* CFI < 1.1, try to guess from device id */
                                if ((info->device_id & 0x80) != 0) {
                                        geometry_reversed = 1;
                                }
                                break;
                        }
                        /* CFI >= 1.1, deduct from top/bottom flag */
                        /* note: ext_addr is valid since cfi_version > 0 */
                        if (flash_read_uchar(info, info->ext_addr + 0xf) == 3) {
                                geometry_reversed = 1;
                        }
                        break;
                }

                debug ("manufacturer is %d\n", info->vendor);
                debug ("manufacturer id is 0x%x\n", info->manufacturer_id);
                debug ("device id is 0x%x\n", info->device_id);
                debug ("device id2 is 0x%x\n", info->device_id2);
                debug ("cfi version is 0x%04x\n", info->cfi_version);

                size_ratio = info->portwidth / info->chipwidth;
                /* if the chip is x8/x16 reduce the ratio by half */
                if ((info->interface == FLASH_CFI_X8X16)
                    && (info->chipwidth == FLASH_CFI_BY8)) {
                        size_ratio >>= 1;
                }
                debug ("size_ratio %d port %d bits chip %d bits\n",
                       size_ratio, info->portwidth << CFI_FLASH_SHIFT_WIDTH,
                       info->chipwidth << CFI_FLASH_SHIFT_WIDTH);
                debug ("found %d erase regions\n", num_erase_regions);
                sect_cnt = 0;
                sector = base;

                for (i = 0; i < num_erase_regions; i++) {
                        if (i > NUM_ERASE_REGIONS) {
                                printf ("%d erase regions found, only %d used\n",
                                        num_erase_regions, NUM_ERASE_REGIONS);
                                break;
                        }
                        if (geometry_reversed)
                                tmp = flash_read_long (info, 0,
                                               FLASH_OFFSET_ERASE_REGIONS +
                                               (num_erase_regions - 1 - i) * 4);
                        else
                                tmp = flash_read_long (info, 0,
                                               FLASH_OFFSET_ERASE_REGIONS +
                                               i * 4);
                        erase_region_size =
                                (tmp & 0xffff) ? ((tmp & 0xffff) * 256) : 128;
                        tmp >>= 16;
                        erase_region_count = (tmp & 0xffff) + 1;
                        debug ("erase_region_count = %d erase_region_size = %d\n",
                                erase_region_count, erase_region_size);

                        /* increase the space malloced for the sector start addresses */
                        info->start = realloc(info->start, sizeof(ulong) * (erase_region_count + sect_cnt));
                        info->protect = realloc(info->protect, sizeof(uchar) * (erase_region_count + sect_cnt));

                        for (j = 0; j < erase_region_count; j++) {
                                info->start[sect_cnt] = sector;
                                sector += (erase_region_size * size_ratio);

                                /*
                                 * Only read protection status from supported devices (intel...)
                                 */
                                switch (info->vendor) {
                                case CFI_CMDSET_INTEL_EXTENDED:
                                case CFI_CMDSET_INTEL_STANDARD:
                                        info->protect[sect_cnt] =
                                                flash_isset (info, sect_cnt,
                                                             FLASH_OFFSET_PROTECT,
                                                             FLASH_STATUS_PROTECT);
                                        break;
                                default:
                                        info->protect[sect_cnt] = 0; /* default: not protected */
                                }

                                sect_cnt++;
                        }
                }

                info->sector_count = sect_cnt;
                /* multiply the size by the number of chips */
                info->size = (1 << flash_read_uchar (info, FLASH_OFFSET_SIZE)) * size_ratio;
                info->buffer_size = (1 << flash_read_ushort (info, 0, FLASH_OFFSET_BUFFER_SIZE));
                tmp = 1 << flash_read_uchar (info, FLASH_OFFSET_ETOUT);
                info->erase_blk_tout = (tmp * (1 << flash_read_uchar (info, FLASH_OFFSET_EMAX_TOUT)));
                tmp = (1 << flash_read_uchar (info, FLASH_OFFSET_WBTOUT)) *
                        (1 << flash_read_uchar (info, FLASH_OFFSET_WBMAX_TOUT));
                info->buffer_write_tout = tmp * 1000;
                tmp = (1 << flash_read_uchar (info, FLASH_OFFSET_WTOUT)) *
                      (1 << flash_read_uchar (info, FLASH_OFFSET_WMAX_TOUT));
                info->write_tout = tmp * 1000;
                info->flash_id = FLASH_MAN_CFI;
                if ((info->interface == FLASH_CFI_X8X16) && (info->chipwidth == FLASH_CFI_BY8)) {
                        info->portwidth >>= 1;  /* XXX - Need to test on x8/x16 in parallel. */
                }
        }

        flash_write_cmd (info, 0, 0, info->cmd_reset);
        return (info->size);
}

/* loop through the sectors from the highest address
 * when the passed address is greater or equal to the sector address
 * we have a match
 */
flash_sect_t find_sector (flash_info_t * info, ulong addr)
{
        flash_sect_t sector;

        for (sector = info->sector_count - 1; sector >= 0; sector--) {
                if (addr >= info->start[sector])
                        break;
        }
        return sector;
}

static int cfi_erase(struct cdev *cdev, size_t count, unsigned long offset)
{
        flash_info_t *finfo = (flash_info_t *)cdev->priv;
        unsigned long start, end;
        int i, ret = 0;

        printf("%s: erase 0x%08x (size %d)\n", __FUNCTION__, offset, count);

        start = find_sector(finfo, cdev->dev->map_base + offset);
        end   = find_sector(finfo, cdev->dev->map_base + offset + count - 1);

        for (i = start; i <= end; i++) {
                ret = finfo->cfi_cmd_set->flash_erase_one(finfo, i);
                if (ret)
                        goto out;
                printf(".");
        }
out:
        putchar('\n');
        return ret;
}

/*
 * Copy memory to flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
static int write_buff (flash_info_t * info, const uchar * src, ulong addr, ulong cnt)
{
        ulong wp;
        ulong cp;
        int aln;
        cfiword_t cword;
        int i, rc;

#ifdef CONFIG_CFI_BUFFER_WRITE
        int buffered_size;
#endif
        /* get lower aligned address */
        /* get lower aligned address */
        wp = (addr & ~(info->portwidth - 1));

        /* handle unaligned start */
        if ((aln = addr - wp) != 0) {
                cword.l = 0;
                cp = wp;
                for (i = 0; i < aln; ++i, ++cp)
                        flash_add_byte (info, &cword, (*(uchar *) cp));

                for (; (i < info->portwidth) && (cnt > 0); i++) {
                        flash_add_byte (info, &cword, *src++);
                        cnt--;
                        cp++;
                }
                for (; (cnt == 0) && (i < info->portwidth); ++i, ++cp)
                        flash_add_byte (info, &cword, (*(uchar *) cp));
                if ((rc = flash_write_cfiword (info, wp, cword)) != 0)
                        return rc;
                wp = cp;
        }

        /* handle the aligned part */
#ifdef CONFIG_CFI_BUFFER_WRITE
        buffered_size = (info->portwidth / info->chipwidth);
        buffered_size *= info->buffer_size;
        while (cnt >= info->portwidth) {
                /* prohibit buffer write when buffer_size is 1 */
                if (info->buffer_size == 1) {
                        cword.l = 0;
                        for (i = 0; i < info->portwidth; i++)
                                flash_add_byte (info, &cword, *src++);
                        if ((rc = flash_write_cfiword (info, wp, cword)) != 0)
                                return rc;
                        wp += info->portwidth;
                        cnt -= info->portwidth;
                        continue;
                }

                /* write buffer until next buffered_size aligned boundary */
                i = buffered_size - (wp % buffered_size);
                if (i > cnt)
                        i = cnt;
                if ((rc = info->cfi_cmd_set->flash_write_cfibuffer (info, wp, src, i)) != ERR_OK)
                        return rc;
                i -= i & (info->portwidth - 1);
                wp += i;
                src += i;
                cnt -= i;
        }
#else
        while (cnt >= info->portwidth) {
                cword.l = 0;
                for (i = 0; i < info->portwidth; i++) {
                        flash_add_byte (info, &cword, *src++);
                }
                if ((rc = flash_write_cfiword (info, wp, cword)) != 0)
                        return rc;
                wp += info->portwidth;
                cnt -= info->portwidth;
        }
#endif /* CONFIG_CFI_BUFFER_WRITE */
        if (cnt == 0) {
                return (0);
        }

        /*
         * handle unaligned tail bytes
         */
        cword.l = 0;
        for (i = 0, cp = wp; (i < info->portwidth) && (cnt > 0); ++i, ++cp) {
                flash_add_byte (info, &cword, *src++);
                --cnt;
        }
        for (; i < info->portwidth; ++i, ++cp) {
                flash_add_byte (info, &cword, (*(uchar *) cp));
        }

        return flash_write_cfiword (info, wp, cword);
}

static int flash_real_protect (flash_info_t * info, long sector, int prot)
{
        int retcode = 0;

        flash_write_cmd (info, sector, 0, FLASH_CMD_CLEAR_STATUS);
        flash_write_cmd (info, sector, 0, FLASH_CMD_PROTECT);
        if (prot)
                flash_write_cmd (info, sector, 0, FLASH_CMD_PROTECT_SET);
        else
                flash_write_cmd (info, sector, 0, FLASH_CMD_PROTECT_CLEAR);

        if ((retcode =
             flash_status_check (info, sector, info->erase_blk_tout,
                                      prot ? "protect" : "unprotect")) == 0) {

                info->protect[sector] = prot;

                /*
                 * On some of Intel's flash chips (marked via legacy_unlock)
                 * unprotect unprotects all locking.
                 */
                if ((prot == 0) && (info->legacy_unlock)) {
                        flash_sect_t i;

                        for (i = 0; i < info->sector_count; i++) {
                                if (info->protect[i])
                                        flash_real_protect (info, i, 1);
                        }
                }
        }
        return retcode;
}

static int cfi_protect(struct cdev *cdev, size_t count, unsigned long offset, int prot)
{
        flash_info_t *finfo = (flash_info_t *)cdev->priv;
        unsigned long start, end;
        int i, ret = 0;
        const char *action = (prot? "protect" : "unprotect");

        printf("%s: %s 0x%08x (size %d)\n", __FUNCTION__,
                action, cdev->dev->map_base + offset, count);

        start = find_sector(finfo, cdev->dev->map_base + offset);
        end   = find_sector(finfo, cdev->dev->map_base + offset + count - 1);

        for (i = start; i <= end; i++) {
                ret = flash_real_protect (finfo, i, prot);
                if (ret)
                        goto out;
        }
out:
        putchar('\n');
        return ret;
}

static ssize_t cfi_write(struct cdev *cdev, const void *buf, size_t count, unsigned long offset, ulong flags)
{
        flash_info_t *finfo = (flash_info_t *)cdev->priv;
        int ret;

        debug("cfi_write: buf=0x%08x addr=0x%08x count=0x%08x\n",buf, cdev->dev->map_base + offset, count);

        ret = write_buff (finfo, buf, cdev->dev->map_base + offset, count);
        return ret == 0 ? count : -1;
}

static void cfi_info (struct device_d* dev)
{
        flash_info_t *info = (flash_info_t *)dev->priv;
        int i;

        if (info->flash_id != FLASH_MAN_CFI) {
                puts ("missing or unknown FLASH type\n");
                return;
        }

        printf ("CFI conformant FLASH (%d x %d)",
                (info->portwidth << 3), (info->chipwidth << 3));
        printf ("  Size: %ld MB in %d Sectors\n",
                info->size >> 20, info->sector_count);
        printf ("  ");
        switch (info->vendor) {
                case CFI_CMDSET_INTEL_STANDARD:
                        printf ("Intel Standard");
                        break;
                case CFI_CMDSET_INTEL_EXTENDED:
                        printf ("Intel Extended");
                        break;
                case CFI_CMDSET_AMD_STANDARD:
                        printf ("AMD Standard");
                        break;
                case CFI_CMDSET_AMD_EXTENDED:
                        printf ("AMD Extended");
                        break;
                default:
                        printf ("Unknown (%d)", info->vendor);
                        break;
        }
        printf (" command set, Manufacturer ID: 0x%02X, Device ID: 0x%02X",
                info->manufacturer_id, info->device_id);
        if (info->device_id == 0x7E) {
                printf("%04X", info->device_id2);
        }
        printf ("\n  Erase timeout: %ld ms, write timeout: %ld ms\n",
                info->erase_blk_tout,
                info->write_tout);
        if (info->buffer_size > 1) {
                printf ("  Buffer write timeout: %ld ms, buffer size: %d bytes\n",
                info->buffer_write_tout,
                info->buffer_size);
        }

        puts ("\n  Sector Start Addresses:");
        for (i = 0; i < info->sector_count; ++i) {
                if ((i % 5) == 0)
                        printf ("\n");
#ifdef CFG_FLASH_EMPTY_INFO
        {
                int k;
                int size;
                int erased;
                volatile unsigned long *flash;

                /*
                 * Check if whole sector is erased
                 */
                if (i != (info->sector_count - 1))
                        size = info->start[i + 1] - info->start[i];
                else
                        size = info->start[0] + info->size - info->start[i];
                erased = 1;
                flash = (volatile unsigned long *) info->start[i];
                size = size >> 2;       /* divide by 4 for longword access */
                for (k = 0; k < size; k++) {
                        if (*flash++ != 0xffffffff) {
                                erased = 0;
                                break;
                        }
                }

                /* print empty and read-only info */
                printf ("  %08lX %c %s ",
                        info->start[i],
                        erased ? 'E' : ' ',
                        info->protect[i] ? "RO" : "  ");
        }
#else   /* ! CFG_FLASH_EMPTY_INFO */
                printf ("  %08lX   %s ",
                        info->start[i],
                        info->protect[i] ? "RO" : "  ");
#endif
        }
        putchar('\n');
        return;
}

#if 0
/*
 * flash_read_user_serial - read the OneTimeProgramming cells
 */
static void flash_read_user_serial (flash_info_t * info, void *buffer, int offset,
                             int len)
{
        uchar *src;
        uchar *dst;

        dst = buffer;
        src = flash_make_addr (info, 0, FLASH_OFFSET_USER_PROTECTION);
        flash_write_cmd (info, 0, 0, FLASH_CMD_READ_ID);
        memcpy (dst, src + offset, len);
        flash_write_cmd (info, 0, 0, info->cmd_reset);
}

/*
 * flash_read_factory_serial - read the device Id from the protection area
 */
static void flash_read_factory_serial (flash_info_t * info, void *buffer, int offset,
                                int len)
{
        uchar *src;

        src = flash_make_addr (info, 0, FLASH_OFFSET_INTEL_PROTECTION);
        flash_write_cmd (info, 0, 0, FLASH_CMD_READ_ID);
        memcpy (buffer, src + offset, len);
        flash_write_cmd (info, 0, 0, info->cmd_reset);
}

#endif 

int flash_status_check (flash_info_t * info, flash_sect_t sector,
                               uint64_t tout, char *prompt)
{
        return info->cfi_cmd_set->flash_status_check(info, sector, tout, prompt);
}

/*
 *  wait for XSR.7 to be set. Time out with an error if it does not.
 *  This routine does not set the flash to read-array mode.
 */
int flash_generic_status_check (flash_info_t * info, flash_sect_t sector,
                               uint64_t tout, char *prompt)
{
        uint64_t start;

        tout *= 1000000;

        /* Wait for command completion */
        start = get_time_ns();
        while (info->cfi_cmd_set->flash_is_busy (info, sector)) {
                if (is_timeout(start, tout)) {
                        printf ("Flash %s timeout at address %lx data %lx\n",
                                prompt, info->start[sector],
                                flash_read_long (info, sector, 0));
                        flash_write_cmd (info, sector, 0, info->cmd_reset);
                        return ERR_TIMOUT;
                }
                udelay (1);             /* also triggers watchdog */
        }
        return ERR_OK;
}

/*
 * make a proper sized command based on the port and chip widths
 */
void flash_make_cmd (flash_info_t * info, uchar cmd, void *cmdbuf)
{
        int i;
        uchar *cp = (uchar *) cmdbuf;

#if defined(__LITTLE_ENDIAN)
        for (i = info->portwidth; i > 0; i--)
#else
        for (i = 1; i <= info->portwidth; i++)
#endif
                *cp++ = (i & (info->chipwidth - 1)) ? '\0' : cmd;
}
                
/*
 * Write a proper sized command to the correct address
 */
void flash_write_cmd (flash_info_t * info, flash_sect_t sect, uint offset, uchar cmd)
{

        uchar *addr;
        cfiword_t cword;

        addr = flash_make_addr (info, sect, offset);
        flash_make_cmd (info, cmd, &cword);
        flash_write_word(info, cword, addr);
}

int flash_isequal (flash_info_t * info, flash_sect_t sect, uint offset, uchar cmd)
{
        cfiptr_t cptr;
        cfiword_t cword;
        int retval;

        cptr.cp = flash_make_addr (info, sect, offset);
        flash_make_cmd (info, cmd, &cword);

        debug ("is= cmd %x(%c) addr %p ", cmd, cmd, cptr.cp);
        if (bankwidth_is_1(info)) {
                debug ("is= %x %x\n", cptr.cp[0], cword.c);
                retval = (cptr.cp[0] == cword.c);
        } else if (bankwidth_is_2(info)) {
                debug ("is= %4.4x %4.4x\n", cptr.wp[0], cword.w);
                retval = (cptr.wp[0] == cword.w);
        } else if (bankwidth_is_4(info)) {
                debug ("is= %8.8lx %8.8lx\n", cptr.lp[0], cword.l);
                retval = (cptr.lp[0] == cword.l);
        } else if (bankwidth_is_8(info)) {
#ifdef DEBUG
                {
                        char str1[20];
                        char str2[20];

                        print_longlong (str1, cptr.llp[0]);
                        print_longlong (str2, cword.ll);
                        debug ("is= %s %s\n", str1, str2);
                }
#endif
                retval = (cptr.llp[0] == cword.ll);
        } else
                retval = 0;

        return retval;
}

int flash_isset (flash_info_t * info, flash_sect_t sect, uint offset, uchar cmd)
{
        cfiptr_t cptr;
        cfiword_t cword;
        int retval;

        cptr.cp = flash_make_addr (info, sect, offset);
        flash_make_cmd (info, cmd, &cword);
        if (bankwidth_is_1(info)) {
                retval = ((cptr.cp[0] & cword.c) == cword.c);
        } else if (bankwidth_is_2(info)) {
                retval = ((cptr.wp[0] & cword.w) == cword.w);
        } else if (bankwidth_is_4(info)) {
                retval = ((cptr.lp[0] & cword.l) == cword.l);
        } else if (bankwidth_is_8(info)) {
                retval = ((cptr.llp[0] & cword.ll) == cword.ll);
        } else
                retval = 0;

        return retval;
}

struct file_operations cfi_ops = {
        .read    = mem_read,
        .write   = cfi_write,
        .lseek  = dev_lseek_default,
        .erase   = cfi_erase,
        .protect = cfi_protect,
        .memmap  = generic_memmap_ro,
};

static int cfi_probe (struct device_d *dev)
{
        unsigned long size = 0;
        flash_info_t *info = xzalloc(sizeof(flash_info_t));

        dev->priv = (void *)info;

        printf("cfi_probe: %s base: 0x%08x size: 0x%08x\n", dev->name, dev->map_base, dev->size);

        /* Init: no FLASHes known */
        info->flash_id = FLASH_UNKNOWN;
        size += info->size = flash_get_size(info, dev->map_base);

        if (dev->size == 0) {
                printf("cfi_probe: size : 0x%08x\n", info->size);
                dev->size = info->size;
        }

        if (info->flash_id == FLASH_UNKNOWN) {
                printf ("## Unknown FLASH on Bank at 0x%08x - Size = 0x%08lx = %ld MB\n",
                        dev->map_base, info->size, info->size << 20);
                return -ENODEV;
        }

        info->cdev.name = asprintf("nor%d", dev->id);
        info->cdev.size = info->size;
        info->cdev.dev = dev;
        info->cdev.ops = &cfi_ops;
        info->cdev.priv = info;
        devfs_create(&info->cdev);

        return 0;
}

static struct driver_d cfi_driver = {
        .name    = "cfi_flash",
        .probe   = cfi_probe,
        .info    = cfi_info,
};

static int cfi_init(void)
{
        return register_driver(&cfi_driver);
}

device_initcall(cfi_init);