Initial revision

1 files changed, 473 insertions, 0 deletions

diff --git a/board/lart/flash.c b/board/lart/flash.c
new file mode 100644
index 0000000..7b19524
--- /dev/null
+++ b/board/lart/flash.c
@@ -0,0 +1,473 @@
+/*
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@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 0x800000
+#define MAIN_SECT_SIZE  0x20000
+#define PARAM_SECT_SIZE 0x4000
+
+/* puzzle magic for lart
+ * data_*_flash are def'd in flashasm.S
+ */
+
+extern u32 data_from_flash(u32);
+extern u32 data_to_flash(u32);
+
+#define PUZZLE_FROM_FLASH(x)	data_from_flash((x))
+#define PUZZLE_TO_FLASH(x)	data_to_flash((x))
+
+flash_info_t    flash_info[CFG_MAX_FLASH_BANKS];
+
+
+#define CMD_READ_ARRAY		0x00FF00FF
+#define CMD_IDENTIFY		0x00900090
+#define CMD_ERASE_SETUP		0x00200020
+#define CMD_ERASE_CONFIRM	0x00D000D0
+#define CMD_PROGRAM		0x00400040
+#define CMD_RESUME		0x00D000D0
+#define CMD_SUSPEND		0x00B000B0
+#define CMD_STATUS_READ		0x00700070
+#define CMD_STATUS_RESET	0x00500050
+
+#define BIT_BUSY		0x00800080
+#define BIT_ERASE_SUSPEND	0x00400040
+#define BIT_ERASE_ERROR		0x00200020
+#define BIT_PROGRAM_ERROR	0x00100010
+#define BIT_VPP_RANGE_ERROR	0x00080008
+#define BIT_PROGRAM_SUSPEND	0x00040004
+#define BIT_PROTECT_ERROR	0x00020002
+#define BIT_UNDEFINED		0x00010001
+
+#define BIT_SEQUENCE_ERROR	0x00300030
+#define BIT_TIMEOUT		0x80000000
+
+/*-----------------------------------------------------------------------
+ */
+
+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 =
+	  (INTEL_MANUFACT & FLASH_VENDMASK) |
+	  (INTEL_ID_28F160F3B & 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 <= 7)
+	    {
+		flash_info[i].start[j] = flashbase + j * PARAM_SECT_SIZE;
+	    }
+	    else
+	    {
+		flash_info[i].start[j] = flashbase + (j - 7)*MAIN_SECT_SIZE;
+	    }
+	}
+	size += flash_info[i].size;
+    }
+
+    /* Protect monitor and environment sectors
+     */
+    flash_protect(FLAG_PROTECT_SET,
+		  CFG_FLASH_BASE,
+		  CFG_FLASH_BASE + _armboot_end_data - _armboot_start,
+		  &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 (INTEL_MANUFACT & FLASH_VENDMASK):
+	printf("Intel: ");
+	break;
+    default:
+	printf("Unknown Vendor ");
+	break;
+    }
+
+    switch (info->flash_id & FLASH_TYPEMASK)
+    {
+    case (INTEL_ID_28F160F3B & FLASH_TYPEMASK):
+	printf("2x 28F160F3B (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_error (ulong code)
+{
+	/* Check bit patterns */
+	/* SR.7=0 is busy, SR.7=1 is ready */
+	/* all other flags indicate error on 1 */
+	/* SR.0 is undefined */
+	/* Timeout is our faked flag */
+
+	/* sequence is described in Intel 290644-005 document */
+
+	/* check Timeout */
+	if (code & BIT_TIMEOUT)
+	{
+		printf ("Timeout\n");
+		return ERR_TIMOUT;
+	}
+
+	/* check Busy, SR.7 */
+	if (~code & BIT_BUSY)
+	{
+		printf ("Busy\n");
+		return ERR_PROG_ERROR;
+	}
+
+	/* check Vpp low, SR.3 */
+	if (code & BIT_VPP_RANGE_ERROR)
+	{
+		printf ("Vpp range error\n");
+		return ERR_PROG_ERROR;
+	}
+
+	/* check Device Protect Error, SR.1 */
+	if (code & BIT_PROTECT_ERROR)
+	{
+		printf ("Device protect error\n");
+		return ERR_PROG_ERROR;
+	}
+
+	/* check Command Seq Error, SR.4 & SR.5 */
+	if (code & BIT_SEQUENCE_ERROR)
+	{
+		printf ("Command seqence error\n");
+		return ERR_PROG_ERROR;
+	}
+
+	/* check Block Erase Error, SR.5 */
+	if (code & BIT_ERASE_ERROR)
+	{
+		printf ("Block erase error\n");
+		return ERR_PROG_ERROR;
+	}
+
+	/* check Program Error, SR.4 */
+	if (code & BIT_PROGRAM_ERROR)
+	{
+		printf ("Program error\n");
+		return ERR_PROG_ERROR;
+	}
+
+	/* check Block Erase Suspended, SR.6 */
+	if (code & BIT_ERASE_SUSPEND)
+	{
+		printf ("Block erase suspended\n");
+		return ERR_PROG_ERROR;
+	}
+
+	/* check Program Suspended, SR.2 */
+	if (code & BIT_PROGRAM_SUSPEND)
+	{
+		printf ("Program suspended\n");
+		return ERR_PROG_ERROR;
+	}
+
+	/* OK, no error */
+	return ERR_OK;
+}
+
+/*-----------------------------------------------------------------------
+ */
+
+int	flash_erase (flash_info_t *info, int s_first, int s_last)
+{
+    ulong result;
+    int iflag, cflag, prot, sect;
+    int rc = ERR_OK;
+
+    /* 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) !=
+	(INTEL_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.
+     */
+    cflag = icache_status();
+    icache_disable();
+    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_masked();
+
+	if (info->protect[sect] == 0)
+	{	/* not protected */
+	    vu_long *addr = (vu_long *)(info->start[sect]);
+
+	    *addr = PUZZLE_TO_FLASH(CMD_STATUS_RESET);
+	    *addr = PUZZLE_TO_FLASH(CMD_ERASE_SETUP);
+	    *addr = PUZZLE_TO_FLASH(CMD_ERASE_CONFIRM);
+
+	    /* wait until flash is ready */
+	    do
+	    {
+		/* check timeout */
+		if (get_timer_masked() > CFG_FLASH_ERASE_TOUT)
+		{
+		    *addr = PUZZLE_TO_FLASH(CMD_SUSPEND);
+		    result = BIT_TIMEOUT;
+		    break;
+		}
+
+		result = PUZZLE_FROM_FLASH(*addr);
+	    }  while (~result & BIT_BUSY);
+
+	    *addr = PUZZLE_TO_FLASH(CMD_READ_ARRAY);
+
+	    if ((rc = flash_error(result)) != ERR_OK)
+	    	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_masked(10000);
+
+    if (iflag)
+      enable_interrupts();
+
+    if (cflag)
+      icache_enable();
+
+    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 cflag, iflag;
+
+    /* Check if Flash is (sufficiently) erased
+     */
+    result = PUZZLE_FROM_FLASH(*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.
+     */
+    cflag = icache_status();
+    icache_disable();
+    iflag = disable_interrupts();
+
+    *addr = PUZZLE_TO_FLASH(CMD_STATUS_RESET);
+    *addr = PUZZLE_TO_FLASH(CMD_PROGRAM);
+    *addr = data;
+
+    /* arm simple, non interrupt dependent timer */
+    reset_timer_masked();
+
+    /* wait until flash is ready */
+    do
+    {
+	/* check timeout */
+	if (get_timer_masked() > CFG_FLASH_ERASE_TOUT)
+	{
+	    *addr = PUZZLE_TO_FLASH(CMD_SUSPEND);
+	    result = BIT_TIMEOUT;
+	    break;
+	}
+
+	result = PUZZLE_FROM_FLASH(*addr);
+    }  while (~result & BIT_BUSY);
+
+    *addr = PUZZLE_TO_FLASH(CMD_READ_ARRAY);
+
+    rc = flash_error(result);
+
+    if (iflag)
+      enable_interrupts();
+
+    if (cflag)
+      icache_enable();
+
+    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);
+}