Initial revision

1 files changed, 372 insertions, 0 deletions

diff --git a/board/oxc/flash.c b/board/oxc/flash.c
new file mode 100644
index 0000000..4f0220e
--- /dev/null
+++ b/board/oxc/flash.c
@@ -0,0 +1,372 @@
+/*
+ * (C) Copyright 2000
+ * Marius Groeger <mgroeger@sysgo.de>
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ *
+ * (C) Copyright 2000
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * Flash Routines for STM29W320DB/STM29W800D flash chips
+ *
+ *--------------------------------------------------------------------
+ * 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>
+
+flash_info_t	flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips	*/
+
+/*-----------------------------------------------------------------------
+ * Functions
+ */
+
+static ulong flash_get_size (vu_char *addr, flash_info_t *info);
+static int write_byte (flash_info_t *info, ulong dest, uchar data);
+
+/*-----------------------------------------------------------------------
+ */
+
+unsigned long flash_init (void)
+{
+    unsigned long size;
+    int i;
+
+    /* Init: no FLASHes known */
+    for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
+	flash_info[i].flash_id = FLASH_UNKNOWN;
+    }
+
+    /*
+     * We use the following trick here: since flash is cyclically
+     * mapped in the 0xFF800000-0xFFFFFFFF area, we detect the type
+     * and the size of flash using 0xFF800000 as the base address,
+     * and then call flash_get_size() again to fill flash_info.
+     */
+    size = flash_get_size((vu_char *)CFG_FLASH_PRELIMBASE, &flash_info[0]);
+    if (size)
+    {
+	flash_get_size((vu_char *)(-size), &flash_info[0]);
+    }
+
+#if (CFG_MONITOR_BASE >= CFG_FLASH_PRELIMBASE)
+    /* monitor protection ON by default */
+    flash_protect(FLAG_PROTECT_SET,
+		  CFG_MONITOR_BASE,
+		  CFG_MONITOR_BASE+CFG_MONITOR_LEN-1,
+		  &flash_info[0]);
+#endif
+
+#if (CFG_ENV_IS_IN_FLASH == 1) && defined(CFG_ENV_ADDR)
+# ifndef  CFG_ENV_SIZE
+#  define CFG_ENV_SIZE	CFG_ENV_SECT_SIZE
+# endif
+    flash_protect(FLAG_PROTECT_SET,
+		  CFG_ENV_ADDR,
+		  CFG_ENV_ADDR + CFG_ENV_SIZE - 1,
+		  &flash_info[0]);
+#endif
+
+    return (size);
+}
+
+/*-----------------------------------------------------------------------
+ */
+void flash_print_info  (flash_info_t *info)
+{
+    int i;
+
+    if (info->flash_id == FLASH_UNKNOWN) {
+	printf ("missing or unknown FLASH type\n");
+	return;
+    }
+
+    switch (info->flash_id & FLASH_VENDMASK) {
+    case FLASH_MAN_STM:
+	printf ("ST ");
+	break;
+    default:
+	printf ("Unknown Vendor ");
+	break;
+    }
+
+    switch (info->flash_id & FLASH_TYPEMASK) {
+    case FLASH_STM320DB:
+	printf ("M29W320DB (32 Mbit)\n");
+	break;
+    case FLASH_STM800DB:
+	printf ("M29W800DB (8 Mbit, bottom boot block)\n");
+	break;
+    case FLASH_STM800DT:
+	printf ("M29W800DT (8 Mbit, top boot block)\n");
+	break;
+    default:
+	printf ("Unknown Chip Type\n");
+	break;
+    }
+
+    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) {
+	if ((i % 5) == 0)
+	    printf ("\n   ");
+	printf (" %08lX%s",
+		info->start[i],
+		info->protect[i] ? " (RO)" : "     "
+		);
+    }
+    printf ("\n");
+    return;
+}
+
+/*
+ * The following code cannot be run from FLASH!
+ */
+
+static ulong flash_get_size (vu_char *addr, flash_info_t *info)
+{
+    short i;
+    uchar vendor, devid;
+    ulong base = (ulong)addr;
+
+    /* Write auto select command: read Manufacturer ID */
+    addr[0x0AAA] = 0xAA;
+    addr[0x0555] = 0x55;
+    addr[0x0AAA] = 0x90;
+
+    udelay(1000);
+
+    vendor = addr[0];
+    devid = addr[2];
+
+    /* only support STM */
+    if ((vendor << 16) != FLASH_MAN_STM) {
+	return 0;
+    }
+
+    if (devid == FLASH_STM320DB) {
+    	/* MPC8240 can address maximum 2Mb of flash, that is why the MSB
+	 * lead is grounded and we can access only 2 first Mb */
+	info->flash_id     = vendor << 16 | devid;
+	info->sector_count = 32;
+	info->size         = info->sector_count * 0x10000;
+	for (i = 0; i < info->sector_count; i++) {
+	    info->start[i] = base + i * 0x10000;
+	}
+    }
+    else if (devid == FLASH_STM800DB) {
+	info->flash_id     = vendor << 16 | devid;
+	info->sector_count = 19;
+	info->size         = 0x100000;
+	info->start[0]     = 0x0000;
+	info->start[1]     = 0x4000;
+	info->start[2]     = 0x6000;
+	info->start[3]     = 0x8000;
+	for (i = 4; i < info->sector_count; i++) {
+	    info->start[i] = base + (i-3) * 0x10000;
+	}
+    }
+    else if (devid == FLASH_STM800DT) {
+	info->flash_id     = vendor << 16 | devid;
+	info->sector_count = 19;
+	info->size         = 0x100000;
+	for (i = 0; i < info->sector_count-4; i++) {
+	    info->start[i] = base + i * 0x10000;
+	}
+	info->start[i]     = base + i * 0x10000;
+	info->start[i+1]   = base + i * 0x10000 + 0x8000;
+	info->start[i+2]   = base + i * 0x10000 + 0xa000;
+	info->start[i+3]   = base + i * 0x10000 + 0xc000;
+    }
+    else {
+	return 0;
+    }
+
+    /* mark all sectors as unprotected */
+    for (i = 0; i < info->sector_count; i++) {
+	info->protect[i] = 0;
+    }
+
+    /* Issue the reset command */
+    if (info->flash_id != FLASH_UNKNOWN) {
+	addr[0] = 0xF0;	/* reset bank */
+    }
+
+    return (info->size);
+}
+
+
+/*-----------------------------------------------------------------------
+ */
+
+int	flash_erase (flash_info_t *info, int s_first, int s_last)
+{
+    vu_char *addr = (vu_char *)(info->start[0]);
+    int flag, prot, sect, l_sect;
+    ulong start, now, last;
+
+    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;
+    }
+
+    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[0x0AAA] = 0xAA;
+    addr[0x0555] = 0x55;
+    addr[0x0AAA] = 0x80;
+    addr[0x0AAA] = 0xAA;
+    addr[0x0555] = 0x55;
+
+    /* wait at least 80us - let's wait 1 ms */
+    udelay (1000);
+
+    /* Start erase on unprotected sectors */
+    for (sect = s_first; sect<=s_last; sect++) {
+	if (info->protect[sect] == 0) {	/* not protected */
+	    addr = (vu_char *)(info->start[sect]);
+	    addr[0] = 0x30;
+	    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 = (vu_char *)(info->start[l_sect]);
+    while ((addr[0] & 0x80) != 0x80) {
+	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 = (volatile unsigned char *)info->start[0];
+    addr[0] = 0xF0;	/* reset bank */
+
+    printf (" done\n");
+    return 0;
+}
+
+/*-----------------------------------------------------------------------
+ * 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)
+{
+    int rc;
+
+    while (cnt > 0) {
+	if ((rc = write_byte(info, addr, *src)) != 0) {
+	    return (rc);
+	}
+	addr++;
+	src++;
+	cnt--;
+    }
+
+    return (0);
+}
+
+/*-----------------------------------------------------------------------
+ * Write a byte to Flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+static int write_byte (flash_info_t *info, ulong dest, uchar data)
+{
+    vu_char *addr = (vu_char *)(info->start[0]);
+    ulong start;
+    int flag;
+
+    /* Check if Flash is (sufficiently) erased */
+    if ((*((vu_char *)dest) & data) != data) {
+	return (2);
+    }
+    /* Disable interrupts which might cause a timeout here */
+    flag = disable_interrupts();
+
+    addr[0x0AAA] = 0xAA;
+    addr[0x0555] = 0x55;
+    addr[0x0AAA] = 0xA0;
+
+    *((vu_char *)dest) = data;
+
+    /* re-enable interrupts if necessary */
+    if (flag)
+      enable_interrupts();
+
+    /* data polling for D7 */
+    start = get_timer (0);
+    while ((*((vu_char *)dest) & 0x80) != (data & 0x80)) {
+	if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
+	    return (1);
+	}
+    }
+    return (0);
+}
+
+/*-----------------------------------------------------------------------
+ */