Patch by Greg Ungerer, 19 May 2005:

add support for the OpenGear CM4008 board

1 files changed, 409 insertions, 0 deletions

diff --git a/board/cm4008/flash.c b/board/cm4008/flash.c
new file mode 100644
index 0000000..86c8e2a
--- /dev/null
+++ b/board/cm4008/flash.c
@@ -0,0 +1,409 @@
+/*
+ * (C) Copyright 2005
+ * Greg Ungerer, OpenGear Inc, greg.ungerer@opengear.com
+ *
+ * (C) Copyright 2001
+ * Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
+ *
+ * (C) Copyright 2001
+ * 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
+ */
+
+#include <common.h>
+#include <linux/byteorder/swab.h>
+
+
+flash_info_t flash_info[CFG_MAX_FLASH_BANKS];	/* info for FLASH chips */
+
+#define mb() __asm__ __volatile__ ("" : : : "memory")
+
+/*-----------------------------------------------------------------------
+ * Functions
+ */
+static ulong flash_get_size (unsigned char * addr, flash_info_t * info);
+static int write_data (flash_info_t * info, ulong dest, unsigned char data);
+static void flash_get_offsets (ulong base, flash_info_t * info);
+void inline spin_wheel (void);
+
+/*-----------------------------------------------------------------------
+ */
+
+unsigned long flash_init (void)
+{
+	int i;
+	ulong size = 0;
+
+	for (i = 0; i < CFG_MAX_FLASH_BANKS; i++) {
+		switch (i) {
+		case 0:
+			flash_get_size ((unsigned char *) PHYS_FLASH_1, &flash_info[i]);
+			flash_get_offsets (PHYS_FLASH_1, &flash_info[i]);
+			break;
+		case 1:
+			/* ignore for now */
+			flash_info[i].flash_id = FLASH_UNKNOWN;
+			break;
+		default:
+			panic ("configured too many flash banks!\n");
+			break;
+		}
+		size += flash_info[i].size;
+	}
+
+	/* Protect monitor and environment sectors
+	 */
+	flash_protect (FLAG_PROTECT_SET,
+		       CFG_FLASH_BASE,
+		       CFG_FLASH_BASE + _bss_start - _armboot_start,
+		       &flash_info[0]);
+
+	return size;
+}
+
+/*-----------------------------------------------------------------------
+ */
+static void flash_get_offsets (ulong base, flash_info_t * info)
+{
+	int i;
+
+	if (info->flash_id == FLASH_UNKNOWN)
+		return;
+
+	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) {
+		for (i = 0; i < info->sector_count; i++) {
+			info->start[i] = base + (i * PHYS_FLASH_SECT_SIZE);
+			info->protect[i] = 0;
+		}
+	}
+}
+
+/*-----------------------------------------------------------------------
+ */
+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_INTEL:
+		printf ("INTEL ");
+		break;
+	default:
+		printf ("Unknown Vendor ");
+		break;
+	}
+
+	switch (info->flash_id & FLASH_TYPEMASK) {
+	case FLASH_28F128J3A:
+		printf ("28F128J3A\n");
+		break;
+	default:
+		printf ("Unknown Chip Type\n");
+		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");
+	return;
+}
+
+/*
+ * The following code cannot be run from FLASH!
+ */
+static ulong flash_get_size (unsigned char * addr, flash_info_t * info)
+{
+	volatile unsigned char value;
+
+	/* Write auto select command: read Manufacturer ID */
+	addr[0x5555] = 0xAA;
+	addr[0x2AAA] = 0x55;
+	addr[0x5555] = 0x90;
+
+	mb ();
+	value = addr[0];
+
+	switch (value) {
+
+	case (unsigned char)INTEL_MANUFACT:
+		info->flash_id = FLASH_MAN_INTEL;
+		break;
+
+	default:
+		info->flash_id = FLASH_UNKNOWN;
+		info->sector_count = 0;
+		info->size = 0;
+		addr[0] = 0xFF;	/* restore read mode */
+		return (0);	/* no or unknown flash  */
+	}
+
+	mb ();
+	value = addr[2];	/* device ID            */
+
+	switch (value) {
+
+	case (unsigned char)INTEL_ID_28F640J3A:
+		info->flash_id += FLASH_28F640J3A;
+		info->sector_count = 64;
+		info->size = 0x00800000;
+		break;		/* => 8 MB     */
+
+	case (unsigned char)INTEL_ID_28F128J3A:
+		info->flash_id += FLASH_28F128J3A;
+		info->sector_count = 128;
+		info->size = 0x01000000;
+		break;		/* => 16 MB     */
+
+	default:
+		info->flash_id = FLASH_UNKNOWN;
+		break;
+	}
+
+	if (info->sector_count > CFG_MAX_FLASH_SECT) {
+		printf ("** ERROR: sector count %d > max (%d) **\n",
+			info->sector_count, CFG_MAX_FLASH_SECT);
+		info->sector_count = CFG_MAX_FLASH_SECT;
+	}
+
+	addr[0] = 0xFF;	/* restore read mode */
+
+	return (info->size);
+}
+
+
+/*-----------------------------------------------------------------------
+ */
+
+int flash_erase (flash_info_t * info, int s_first, int s_last)
+{
+	int flag, prot, sect;
+	ulong type;
+	int rcode = 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;
+	}
+
+	type = (info->flash_id & FLASH_VENDMASK);
+	if ((type != FLASH_MAN_INTEL)) {
+		printf ("Can't erase unknown flash type %08lx - aborted\n",
+			info->flash_id);
+		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");
+
+	/* Disable interrupts which might cause a timeout here */
+	flag = disable_interrupts ();
+
+	/* Start erase on unprotected sectors */
+	for (sect = s_first; sect <= s_last; sect++) {
+		if (info->protect[sect] == 0) {	/* not protected */
+			volatile unsigned char *addr;
+			unsigned char status;
+
+			printf ("Erasing sector %2d ... ", sect);
+
+			/* arm simple, non interrupt dependent timer */
+			reset_timer_masked ();
+
+			addr = (volatile unsigned char *) (info->start[sect]);
+			*addr = 0x50;	/* clear status register */
+			*addr = 0x20;	/* erase setup */
+			*addr = 0xD0;	/* erase confirm */
+
+			while (((status = *addr) & 0x80) != 0x80) {
+				if (get_timer_masked () >
+				    CFG_FLASH_ERASE_TOUT) {
+					printf ("Timeout\n");
+					*addr = 0xB0;	/* suspend erase */
+					*addr = 0xFF;	/* reset to read mode */
+					rcode = 1;
+					break;
+				}
+			}
+
+			*addr = 0x50;	/* clear status register cmd */
+			*addr = 0xFF;	/* resest to read mode */
+
+			printf (" done\n");
+		}
+	}
+	return rcode;
+}
+
+/*-----------------------------------------------------------------------
+ * Copy memory to flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ * 4 - Flash not identified
+ */
+
+int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
+{
+	ulong cp, wp;
+	unsigned char data;
+	int count, i, l, rc, port_width;
+
+	if (info->flash_id == FLASH_UNKNOWN)
+		return 4;
+
+	wp = addr;
+	port_width = 1;
+
+	/*
+	 * 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 < port_width && cnt > 0; ++i) {
+			data = (data << 8) | *src++;
+			--cnt;
+			++cp;
+		}
+		for (; cnt == 0 && i < port_width; ++i, ++cp) {
+			data = (data << 8) | (*(uchar *) cp);
+		}
+
+		if ((rc = write_data (info, wp, data)) != 0) {
+			return (rc);
+		}
+		wp += port_width;
+	}
+
+	/*
+	 * handle word aligned part
+	 */
+	count = 0;
+	while (cnt >= port_width) {
+		data = 0;
+		for (i = 0; i < port_width; ++i) {
+			data = (data << 8) | *src++;
+		}
+		if ((rc = write_data (info, wp, data)) != 0) {
+			return (rc);
+		}
+		wp += port_width;
+		cnt -= port_width;
+		if (count++ > 0x800) {
+			spin_wheel ();
+			count = 0;
+		}
+	}
+
+	if (cnt == 0) {
+		return (0);
+	}
+
+	/*
+	 * handle unaligned tail bytes
+	 */
+	data = 0;
+	for (i = 0, cp = wp; i < port_width && cnt > 0; ++i, ++cp) {
+		data = (data << 8) | *src++;
+		--cnt;
+	}
+	for (; i < port_width; ++i, ++cp) {
+		data = (data << 8) | (*(uchar *) cp);
+	}
+
+	return (write_data (info, wp, data));
+}
+
+/*-----------------------------------------------------------------------
+ * Write a word or halfword to Flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+static int write_data (flash_info_t * info, ulong dest, unsigned char data)
+{
+	volatile unsigned char *addr = (volatile unsigned char *) dest;
+	ulong status;
+	int flag;
+
+	/* Check if Flash is (sufficiently) erased */
+	if ((*addr & data) != data) {
+		printf ("not erased at %08lx (%lx)\n", (ulong) addr,
+			(ulong) * addr);
+		return (2);
+	}
+	/* Disable interrupts which might cause a timeout here */
+	flag = disable_interrupts ();
+
+	*addr = 0x40;	/* write setup */
+	*addr = data;
+
+	/* arm simple, non interrupt dependent timer */
+	reset_timer_masked ();
+
+	/* wait while polling the status register */
+	while (((status = *addr) & 0x80) != 0x80) {
+		if (get_timer_masked () > CFG_FLASH_WRITE_TOUT) {
+			*addr = 0xFF;	/* restore read mode */
+			return (1);
+		}
+	}
+
+	*addr = 0xFF;	/* restore read mode */
+
+	return (0);
+}
+
+void inline spin_wheel (void)
+{
+	static int p = 0;
+	static char w[] = "\\/-";
+
+	printf ("\010%c", w[p]);
+	(++p == 3) ? (p = 0) : 0;
+}