Initial revision

1 files changed, 513 insertions, 0 deletions

diff --git a/board/eltec/elppc/flash.c b/board/eltec/elppc/flash.c
new file mode 100644
index 0000000..5834c99
--- /dev/null
+++ b/board/eltec/elppc/flash.c
@@ -0,0 +1,513 @@
+/*
+ * (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
+ */
+
+/*
+ * 07-10-2002 Frank Gottschling: added 29F032 flash (ELPPC).
+ *        fixed monitor protection part
+ *
+ * 09-18-2001 Andreas Heppel: Reduced the code in here to the usage
+ *        of AMD's 29F040 and 29F016 flashes, since the BAB7xx does use
+ *        any other.
+ */
+
+#include <common.h>
+#include <asm/processor.h>
+#include <asm/pci_io.h>
+
+flash_info_t    flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */
+
+ulong flash_get_size (vu_long *addr, flash_info_t *info);
+static int write_word (flash_info_t *info, ulong dest, ulong data);
+
+/*flash command address offsets*/
+
+#define ADDR0           (0x555)
+#define ADDR1           (0x2AA)
+#define ADDR3           (0x001)
+
+#define FLASH_WORD_SIZE unsigned char
+
+/*----------------------------------------------------------------------------*/
+
+unsigned long flash_init (void)
+{
+    unsigned long size1, size2;
+    int i;
+
+    /* Init: no FLASHes known */
+    for (i=0; i<CFG_MAX_FLASH_BANKS; ++i)
+    {
+        flash_info[i].flash_id = FLASH_UNKNOWN;
+    }
+
+    /* initialise 1st flash */
+    size1 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
+
+    if (flash_info[0].flash_id == FLASH_UNKNOWN)
+    {
+        printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
+            size1, size1<<20);
+    }
+
+    /* initialise 2nd flash */
+    size2 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);
+
+    if (flash_info[1].flash_id == FLASH_UNKNOWN)
+    {
+        printf ("## Unknown FLASH on Bank 1 - Size = 0x%08lx = %ld MB\n",
+            size2, size2<<20);
+    }
+
+    /* monitor protection ON by default */
+    if (size1 == 512*1024)
+    {
+        (void)flash_protect(FLAG_PROTECT_SET,
+                FLASH_BASE0_PRELIM,
+                FLASH_BASE0_PRELIM+CFG_MONITOR_LEN-1,
+                &flash_info[0]);
+    }
+    if (size2 == 512*1024)
+    {
+        (void)flash_protect(FLAG_PROTECT_SET,
+                FLASH_BASE1_PRELIM,
+                FLASH_BASE1_PRELIM+CFG_MONITOR_LEN-1,
+                &flash_info[1]);
+    }
+    if (size2 == 4*1024*1024)
+    {
+        (void)flash_protect(FLAG_PROTECT_SET,
+                CFG_FLASH_BASE,
+                CFG_FLASH_BASE+CFG_MONITOR_LEN-1,
+                &flash_info[1]);
+    }
+
+    return (size1 + size2);
+}
+
+/*----------------------------------------------------------------------------*/
+
+void flash_print_info  (flash_info_t *info)
+{
+    int i;
+    int k;
+    int size;
+    int erased;
+    volatile unsigned long *flash;
+
+    if (info->flash_id == FLASH_UNKNOWN) {
+        printf ("missing or unknown FLASH type\n");
+        flash_init();
+    }
+
+    if (info->flash_id == FLASH_UNKNOWN) {
+        printf ("missing or unknown FLASH type\n");
+        return;
+    }
+
+    switch (info->flash_id & FLASH_VENDMASK) {
+    case FLASH_MAN_AMD:
+        printf ("AMD ");
+        break;
+    default:
+        printf ("Unknown Vendor ");
+        break;
+    }
+
+    switch (info->flash_id & FLASH_TYPEMASK) {
+    case AMD_ID_F040B:
+        printf ("AM29F040B (4 Mbit)\n");
+        break;
+    case AMD_ID_F016D:
+        printf ("AM29F016D (16 Mbit)\n");
+        break;
+    case AMD_ID_F032B:
+        printf ("AM29F032B (32 Mbit)\n");
+        break;
+   default:
+        printf ("Unknown Chip Type\n");
+        break;
+    }
+
+    if (info->size >= (1 << 20)) {
+        printf ("  Size: %ld MB in %d Sectors\n", info->size >> 20, info->sector_count);
+    } else {
+        printf ("  Size: %ld kB in %d Sectors\n", info->size >> 10, info->sector_count);
+    }
+
+    printf ("  Sector Start Addresses:");
+    for (i=0; i<info->sector_count; ++i) {
+        /*
+        * 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;
+            }
+        }
+
+        if ((i % 5) == 0)
+            printf ("\n   ");
+
+        printf (" %08lX%s%s",
+            info->start[i],
+            erased ? " E" : "  ",
+            info->protect[i] ? "RO " : "   ");
+    }
+    printf ("\n");
+}
+
+/*----------------------------------------------------------------------------*/
+/*
+ * The following code cannot be run from FLASH!
+ */
+ulong flash_get_size (vu_long *addr, flash_info_t *info)
+{
+    short i;
+    ulong vendor, devid;
+    ulong base = (ulong)addr;
+    volatile unsigned char *caddr = (unsigned char *)addr;
+
+#ifdef DEBUG
+    printf("flash_get_size for address 0x%lx: \n", (unsigned long)caddr);
+#endif
+
+    /* Write auto select command: read Manufacturer ID */
+    caddr[0] = 0xF0;   /* reset bank */
+    udelay(10);
+
+    eieio();
+    caddr[0x555] = 0xAA;
+    udelay(10);
+    caddr[0x2AA] = 0x55;
+    udelay(10);
+    caddr[0x555] = 0x90;
+
+    udelay(10);
+
+    vendor = caddr[0];
+    devid = caddr[1];
+
+#ifdef DEBUG
+    printf("Manufacturer: 0x%lx\n", vendor);
+#endif
+
+    vendor &= 0xff;
+    devid &= 0xff;
+
+    /* We accept only two AMD types */
+    switch (vendor) {
+    case (FLASH_WORD_SIZE)AMD_MANUFACT:
+        info->flash_id = FLASH_MAN_AMD;
+        break;
+    default:
+        info->flash_id = FLASH_UNKNOWN;
+        info->sector_count = 0;
+        info->size = 0;
+        return (0);         /* no or unknown flash  */
+    }
+
+    switch (devid) {
+    case (FLASH_WORD_SIZE)AMD_ID_F040B:
+        info->flash_id |= AMD_ID_F040B;
+        info->sector_count = 8;
+        info->size = 0x00080000;
+        break;              /* => 0.5 MB      */
+
+    case (FLASH_WORD_SIZE)AMD_ID_F016D:
+        info->flash_id |= AMD_ID_F016D;
+        info->sector_count = 32;
+        info->size         = 0x00200000;
+        break;              /* => 2 MB      */
+
+    case (FLASH_WORD_SIZE)AMD_ID_F032B:
+        info->flash_id |= AMD_ID_F032B;
+        info->sector_count = 64;
+        info->size         = 0x00400000;
+        break;              /* => 4 MB      */
+
+    default:
+        info->flash_id = FLASH_UNKNOWN;
+        return (0);         /* => no or unknown flash */
+
+    }
+
+#ifdef DEBUG
+    printf("flash id 0x%lx; sector count 0x%x, size 0x%lx\n", info->flash_id, info->sector_count, info->size);
+#endif
+
+    /* check for protected sectors */
+    for (i = 0; i < info->sector_count; i++) {
+        /* sector base address */
+        info->start[i] = base + i * (info->size / info->sector_count);
+        /* read sector protection at sector address, (A7 .. A0) = 0x02 */
+        /* D0 = 1 if protected */
+        caddr = (volatile unsigned char *)(info->start[i]);
+        info->protect[i] = caddr[2] & 1;
+    }
+
+    /*
+     * Prevent writes to uninitialized FLASH.
+     */
+    if (info->flash_id != FLASH_UNKNOWN) {
+        caddr = (volatile unsigned char *)info->start[0];
+        caddr[0] = 0xF0;   /* reset bank */
+    }
+
+    return (info->size);
+}
+
+/*----------------------------------------------------------------------------*/
+
+int flash_erase (flash_info_t *info, int s_first, int s_last)
+{
+    volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);
+    int flag, prot, sect, l_sect;
+    ulong start, now, last;
+    int rc = 0;
+
+    if ((s_first < 0) || (s_first > s_last)) {
+        if (info->flash_id == FLASH_UNKNOWN) {
+            printf ("- missing\n");
+        } else {
+            printf ("- no sectors to erase\n");
+        }
+        return 1;
+    }
+
+    if ((info->flash_id == FLASH_UNKNOWN) ||
+        (info->flash_id > FLASH_AMD_COMP)) {
+        printf ("Can't erase unknown flash type - aborted\n");
+        return 1;
+    }
+
+    prot = 0;
+    for (sect=s_first; sect<=s_last; ++sect) {
+        if (info->protect[sect]) {
+            prot++;
+        }
+    }
+
+    if (prot) {
+        printf ("- Warning: %d protected sectors will not be erased!\n",
+            prot);
+    } else {
+        printf ("\n");
+    }
+
+    l_sect = -1;
+
+    /* Disable interrupts which might cause a timeout here */
+    flag = disable_interrupts();
+
+    addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
+    addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
+    addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
+    addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
+    addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
+
+    /* Start erase on unprotected sectors */
+    for (sect = s_first; sect<=s_last; sect++) {
+        if (info->protect[sect] == 0) { /* not protected */
+            addr = (FLASH_WORD_SIZE *)(info->start[sect]);
+            if (info->flash_id & FLASH_MAN_SST) {
+                addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
+                addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
+                addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
+                addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
+                addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
+                addr[0] = (FLASH_WORD_SIZE)0x00500050;  /* block erase */
+                udelay(30000);  /* wait 30 ms */
+            }
+            else
+                addr[0] = (FLASH_WORD_SIZE)0x00300030;  /* sector erase */
+            l_sect = sect;
+        }
+    }
+
+    /* re-enable interrupts if necessary */
+    if (flag)
+        enable_interrupts();
+
+    /* wait at least 80us - let's wait 1 ms */
+    udelay (1000);
+
+    /*
+     * We wait for the last triggered sector
+     */
+    if (l_sect < 0)
+        goto DONE;
+
+    start = get_timer (0);
+    last  = start;
+    addr = (FLASH_WORD_SIZE *)(info->start[l_sect]);
+    while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
+        if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
+            printf ("Timeout\n");
+            return 1;
+        }
+        /* show that we're waiting */
+        if ((now - last) > 1000) {  /* every second */
+            serial_putc ('.');
+            last = now;
+        }
+    }
+
+DONE:
+    /* reset to read mode */
+    addr = (FLASH_WORD_SIZE *)info->start[0];
+    addr[0] = (FLASH_WORD_SIZE)0x00F000F0;  /* reset bank */
+
+    printf (" done\n");
+    return rc;
+}
+
+/*----------------------------------------------------------------------------*/
+/*
+ * Copy memory to flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
+{
+    ulong cp, wp, data;
+    int i, l, rc;
+
+    wp = (addr & ~3);   /* get lower word aligned address */
+
+    /*
+     * handle unaligned start bytes
+     */
+    if ((l = addr - wp) != 0) {
+        data = 0;
+        for (i=0, cp=wp; i<l; ++i, ++cp) {
+            data = (data << 8) | (*(uchar *)cp);
+        }
+        for (; i<4 && cnt>0; ++i) {
+            data = (data << 8) | *src++;
+            --cnt;
+            ++cp;
+        }
+        for (; cnt==0 && i<4; ++i, ++cp) {
+            data = (data << 8) | (*(uchar *)cp);
+        }
+
+        if ((rc = write_word(info, wp, data)) != 0) {
+            return (rc);
+        }
+        wp += 4;
+    }
+
+    /*
+     * handle word aligned part
+     */
+    while (cnt >= 4) {
+        data = 0;
+        for (i=0; i<4; ++i) {
+            data = (data << 8) | *src++;
+        }
+        if ((rc = write_word(info, wp, data)) != 0) {
+            return (rc);
+        }
+        wp  += 4;
+        cnt -= 4;
+    }
+
+    if (cnt == 0) {
+        return (0);
+    }
+
+    /*
+     * handle unaligned tail bytes
+     */
+    data = 0;
+    for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
+        data = (data << 8) | *src++;
+        --cnt;
+    }
+    for (; i<4; ++i, ++cp) {
+        data = (data << 8) | (*(uchar *)cp);
+    }
+
+    return (write_word(info, wp, data));
+}
+
+/*----------------------------------------------------------------------------*/
+/* Write a word to Flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+static int write_word (flash_info_t *info, ulong dest, ulong data)
+{
+        volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)(info->start[0]);
+        volatile FLASH_WORD_SIZE *dest2 = (FLASH_WORD_SIZE *)dest;
+        volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *)&data;
+    ulong start;
+    int flag;
+        int i;
+
+    /* Check if Flash is (sufficiently) erased */
+    if ((*((volatile FLASH_WORD_SIZE *)dest) &
+             (FLASH_WORD_SIZE)data) != (FLASH_WORD_SIZE)data) {
+        return (2);
+    }
+    /* Disable interrupts which might cause a timeout here */
+    flag = disable_interrupts();
+
+        for (i=0; i<4/sizeof(FLASH_WORD_SIZE); i++)
+          {
+            addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
+            addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
+            addr2[ADDR0] = (FLASH_WORD_SIZE)0x00A000A0;
+
+            dest2[i] = data2[i];
+
+            /* re-enable interrupts if necessary */
+            if (flag)
+              enable_interrupts();
+
+            /* data polling for D7 */
+            start = get_timer (0);
+            while ((dest2[i] & (FLASH_WORD_SIZE)0x00800080) !=
+                   (data2[i] & (FLASH_WORD_SIZE)0x00800080)) {
+              if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
+                return (1);
+              }
+            }
+          }
+
+    return (0);
+}
+
+/*----------------------------------------------------------------------------*/
+