* Patch by Daniel Engström, 13 Nov 2002:

  Add support for i386 architecture and AMD SC520 board

* Patch by Pierre Aubert, 12 Nov 2002:
  Add support for DOS filesystem and booting from DOS floppy disk

1 files changed, 449 insertions, 0 deletions

diff --git a/board/sc520_cdp/flash.c b/board/sc520_cdp/flash.c
new file mode 100644
index 0000000..e434512
--- /dev/null
+++ b/board/sc520_cdp/flash.c
@@ -0,0 +1,449 @@
+/*
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.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>
+
+ulong myflush(void);
+
+
+#define FLASH_BANK_SIZE 0x400000	/* 4 MB */
+#define MAIN_SECT_SIZE  0x20000		/* 128 KB */
+
+flash_info_t    flash_info[CFG_MAX_FLASH_BANKS];
+
+
+#define CMD_READ_ARRAY		0x00F000F0
+#define CMD_UNLOCK1		0x00AA00AA
+#define CMD_UNLOCK2		0x00550055
+#define CMD_ERASE_SETUP		0x00800080
+#define CMD_ERASE_CONFIRM	0x00300030
+#define CMD_PROGRAM		0x00A000A0
+#define CMD_UNLOCK_BYPASS	0x00200020
+
+#define MEM_FLASH_ADDR1		(*(volatile u32 *)(CFG_FLASH_BASE + (0x00000555 << 2)))
+#define MEM_FLASH_ADDR2		(*(volatile u32 *)(CFG_FLASH_BASE + (0x000002AA << 2)))
+
+#define BIT_ERASE_DONE		0x00800080
+#define BIT_RDY_MASK		0x00800080
+#define BIT_PROGRAM_ERROR	0x00200020
+#define BIT_TIMEOUT		0x80000000 /* our flag */
+
+#define READY 1
+#define ERR   2
+#define TMO   4
+
+/*-----------------------------------------------------------------------
+ */
+
+ulong flash_init(void)
+{
+    int i, j;
+    ulong size = 0;
+
+    for (i = 0; i < CFG_MAX_FLASH_BANKS; i++)
+    {
+	ulong flashbase = 0;
+	flash_info[i].flash_id =
+	  (AMD_MANUFACT & FLASH_VENDMASK) |
+	  (AMD_ID_LV160B & FLASH_TYPEMASK);
+	flash_info[i].size = FLASH_BANK_SIZE;
+	flash_info[i].sector_count = CFG_MAX_FLASH_SECT;
+	memset(flash_info[i].protect, 0, CFG_MAX_FLASH_SECT);
+	if (i == 0)
+	  flashbase = PHYS_FLASH_1;
+	else
+	  panic("configured to many flash banks!\n");
+	for (j = 0; j < flash_info[i].sector_count; j++)
+	{
+
+	    if (j <= 3)
+	    {
+		/* 1st one is 32 KB */
+		if (j == 0)
+		{
+			flash_info[i].start[j] = flashbase + 0;
+		}
+
+		/* 2nd and 3rd are both 16 KB */
+		if ((j == 1) || (j == 2))
+		{
+			flash_info[i].start[j] = flashbase + 0x8000 + (j-1)*0x4000;
+		}
+
+		/* 4th 64 KB */
+		if (j == 3)
+		{
+			flash_info[i].start[j] = flashbase + 0x10000;
+		}
+	    }
+	    else
+	    {
+		flash_info[i].start[j] = flashbase + (j - 3)*MAIN_SECT_SIZE;
+	    }
+	}
+	size += flash_info[i].size;
+    }
+
+    /*
+     * Protect monitor and environment sectors
+     */
+    flash_protect(FLAG_PROTECT_SET,
+		  i386boot_start-CFG_FLASH_BASE,
+		  i386boot_end-CFG_FLASH_BASE,
+		  &flash_info[0]);
+
+    flash_protect(FLAG_PROTECT_SET,
+		  CFG_ENV_ADDR,
+		  CFG_ENV_ADDR + CFG_ENV_SIZE - 1,
+		  &flash_info[0]);
+    return size;
+}
+
+/*-----------------------------------------------------------------------
+ */
+void flash_print_info  (flash_info_t *info)
+{
+    int i;
+
+    switch (info->flash_id & FLASH_VENDMASK)
+    {
+    case (AMD_MANUFACT & FLASH_VENDMASK):
+	printf("AMD: ");
+	break;
+    default:
+	printf("Unknown Vendor ");
+	break;
+    }
+
+    switch (info->flash_id & FLASH_TYPEMASK)
+    {
+    case (AMD_ID_LV160B & FLASH_TYPEMASK):
+	printf("2x Amd29F160BB (16Mbit)\n");
+	break;
+    default:
+	printf("Unknown Chip Type\n");
+	goto Done;
+	break;
+    }
+
+    printf("  Size: %ld MB in %d Sectors\n",
+	   info->size >> 20, 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");
+
+Done:
+}
+
+/*-----------------------------------------------------------------------
+ */
+
+int	flash_erase (flash_info_t *info, int s_first, int s_last)
+{
+    ulong result;
+    int iflag, cflag, prot, sect;
+    int rc = ERR_OK;
+    int chip1, chip2;
+
+    /* first look for protection bits */
+
+    if (info->flash_id == FLASH_UNKNOWN)
+	return ERR_UNKNOWN_FLASH_TYPE;
+
+    if ((s_first < 0) || (s_first > s_last)) {
+	return ERR_INVAL;
+    }
+
+    if ((info->flash_id & FLASH_VENDMASK) !=
+	(AMD_MANUFACT & FLASH_VENDMASK)) {
+	return ERR_UNKNOWN_FLASH_VENDOR;
+    }
+
+    prot = 0;
+    for (sect=s_first; sect<=s_last; ++sect) {
+	if (info->protect[sect]) {
+	    prot++;
+	}
+    }
+    if (prot)
+	return ERR_PROTECTED;
+
+    /*
+     * Disable interrupts which might cause a timeout
+     * here. Remember that our exception vectors are
+     * at address 0 in the flash, and we don't want a
+     * (ticker) exception to happen while the flash
+     * chip is in programming mode.
+     */
+    iflag = disable_interrupts();
+
+    /* Start erase on unprotected sectors */
+    for (sect = s_first; sect<=s_last && !ctrlc(); sect++)
+    {
+	printf("Erasing sector %2d ... ", sect);
+
+	/* arm simple, non interrupt dependent timer */
+	reset_timer();
+
+	if (info->protect[sect] == 0)
+	{	/* not protected */
+	    vu_long *addr = (vu_long *)(info->start[sect]);
+
+	    MEM_FLASH_ADDR1 = CMD_UNLOCK1;
+	    MEM_FLASH_ADDR2 = CMD_UNLOCK2;
+	    MEM_FLASH_ADDR1 = CMD_ERASE_SETUP;
+
+	    MEM_FLASH_ADDR1 = CMD_UNLOCK1;
+	    MEM_FLASH_ADDR2 = CMD_UNLOCK2;
+	    *addr = CMD_ERASE_CONFIRM;
+
+	    /* wait until flash is ready */
+	    chip1 = chip2 = 0;
+
+	    do
+	    {
+		result = *addr;
+
+		/* check timeout */
+		if (get_timer(0) > CFG_FLASH_ERASE_TOUT)
+		{
+		    MEM_FLASH_ADDR1 = CMD_READ_ARRAY;
+		    chip1 = TMO;
+		    break;
+		}
+
+		if (!chip1 && (result & 0xFFFF) & BIT_ERASE_DONE)
+			chip1 = READY;
+
+		if (!chip1 && (result & 0xFFFF) & BIT_PROGRAM_ERROR)
+			chip1 = ERR;
+
+		if (!chip2 && (result >> 16) & BIT_ERASE_DONE)
+			chip2 = READY;
+
+		if (!chip2 && (result >> 16) & BIT_PROGRAM_ERROR)
+			chip2 = ERR;
+
+	    }  while (!chip1 || !chip2);
+
+	    MEM_FLASH_ADDR1 = CMD_READ_ARRAY;
+
+	    if (chip1 == ERR || chip2 == ERR)
+	    {
+		rc = ERR_PROG_ERROR;
+		goto outahere;
+	    }
+	    if (chip1 == TMO)
+	    {
+		rc = ERR_TIMOUT;
+		goto outahere;
+	    }
+
+	    printf("ok.\n");
+	}
+	else /* it was protected */
+	{
+	    printf("protected!\n");
+	}
+    }
+
+    if (ctrlc())
+      printf("User Interrupt!\n");
+
+outahere:
+    /* allow flash to settle - wait 10 ms */
+    udelay(10000);
+
+    if (iflag)
+      enable_interrupts();
+
+
+    return rc;
+}
+
+/*-----------------------------------------------------------------------
+ * Copy memory to flash
+ */
+
+volatile static int write_word (flash_info_t *info, ulong dest, ulong data)
+{
+    vu_long *addr = (vu_long *)dest;
+    ulong result;
+    int rc = ERR_OK;
+    int iflag;
+    int chip1, chip2;
+
+    /*
+     * Check if Flash is (sufficiently) erased
+     */
+    result = *addr;
+    if ((result & data) != data)
+        return ERR_NOT_ERASED;
+
+
+    /*
+     * Disable interrupts which might cause a timeout
+     * here. Remember that our exception vectors are
+     * at address 0 in the flash, and we don't want a
+     * (ticker) exception to happen while the flash
+     * chip is in programming mode.
+     */
+    iflag = disable_interrupts();
+
+    MEM_FLASH_ADDR1 = CMD_UNLOCK1;
+    MEM_FLASH_ADDR2 = CMD_UNLOCK2;
+    MEM_FLASH_ADDR1 = CMD_UNLOCK_BYPASS;
+    *addr = CMD_PROGRAM;
+    *addr = data;
+
+    /* arm simple, non interrupt dependent timer */
+    reset_timer();
+
+    /* wait until flash is ready */
+    chip1 = chip2 = 0;
+    do
+    {
+	result = *addr;
+
+	/* check timeout */
+	if (get_timer(0) > CFG_FLASH_ERASE_TOUT)
+	{
+	    chip1 = ERR | TMO;
+	    break;
+	}
+	if (!chip1 && ((result & 0x80) == (data & 0x80)))
+		chip1 = READY;
+
+	if (!chip1 && ((result & 0xFFFF) & BIT_PROGRAM_ERROR))
+	{
+		result = *addr;
+
+		if ((result & 0x80) == (data & 0x80))
+			chip1 = READY;
+		else
+			chip1 = ERR;
+	}
+
+	if (!chip2 && ((result & (0x80 << 16)) == (data & (0x80 << 16))))
+		chip2 = READY;
+
+	if (!chip2 && ((result >> 16) & BIT_PROGRAM_ERROR))
+	{
+		result = *addr;
+
+		if ((result & (0x80 << 16)) == (data & (0x80 << 16)))
+			chip2 = READY;
+		else
+			chip2 = ERR;
+	}
+
+    }  while (!chip1 || !chip2);
+
+    *addr = CMD_READ_ARRAY;
+
+    if (chip1 == ERR || chip2 == ERR || *addr != data)
+        rc = ERR_PROG_ERROR;
+
+    if (iflag)
+      enable_interrupts();
+
+
+    return rc;
+}
+
+/*-----------------------------------------------------------------------
+ * Copy memory to flash.
+ */
+
+int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
+{
+    ulong cp, wp, data;
+    int l;
+    int i, 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 << 24);
+	}
+	for (; i<4 && cnt>0; ++i) {
+	    data = (data >> 8) | (*src++ << 24);
+	    --cnt;
+	    ++cp;
+	}
+	for (; cnt==0 && i<4; ++i, ++cp) {
+	    data = (data >> 8) | (*(uchar *)cp << 24);
+	}
+
+	if ((rc = write_word(info, wp, data)) != 0) {
+	    return (rc);
+	}
+	wp += 4;
+    }
+
+    /*
+     * handle word aligned part
+     */
+    while (cnt >= 4) {
+	data = *((vu_long*)src);
+	if ((rc = write_word(info, wp, data)) != 0) {
+	    return (rc);
+	}
+	src += 4;
+	wp  += 4;
+	cnt -= 4;
+    }
+
+    if (cnt == 0) {
+	return ERR_OK;
+    }
+
+    /*
+     * handle unaligned tail bytes
+     */
+    data = 0;
+    for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
+	data = (data >> 8) | (*src++ << 24);
+	--cnt;
+    }
+    for (; i<4; ++i, ++cp) {
+	data = (data >> 8) | (*(uchar *)cp << 24);
+    }
+
+    return write_word(info, wp, data);
+}