Initial revision

1 files changed, 490 insertions, 0 deletions

diff --git a/board/iphase4539/flash.c b/board/iphase4539/flash.c
new file mode 100644
index 0000000..401ffbe
--- /dev/null
+++ b/board/iphase4539/flash.c
@@ -0,0 +1,490 @@
+/*
+ * (C) Copyright 2001
+ * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
+ *
+ * (C) Copyright 2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * Adapted for Interphase 4539 by Wolfgang Grandegger <wg@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 <config.h>
+#include <common.h>
+#include <flash.h>
+#include <asm/io.h>
+
+flash_info_t	flash_info[CFG_MAX_FLASH_BANKS];
+
+extern int hwc_flash_size(void);
+static ulong flash_get_size (u32 addr, flash_info_t *info);
+static int flash_get_offsets (u32 base, flash_info_t *info);
+static int write_word (flash_info_t *info, ulong dest, ulong data);
+static void flash_reset (u32 addr);
+
+#define out8(a,v) *(volatile unsigned char*)(a) = v
+#define in8(a)	  *(volatile unsigned char*)(a)
+#define in32(a)	  *(volatile unsigned long*)(a)
+#define iobarrier_rw() eieio()
+
+unsigned long flash_init (void)
+{
+	unsigned int i;
+	unsigned long flash_size = 0;
+	unsigned long bank_size;
+	unsigned int bank = 0;
+
+	/* Init: no FLASHes known */
+	for (i=0; i < CFG_MAX_FLASH_BANKS; ++i) {
+		flash_info[i].flash_id = FLASH_UNKNOWN;
+		flash_info[i].sector_count = 0;
+		flash_info[i].size = 0;
+	}
+
+	/* Initialise the BOOT Flash */
+	if (bank == CFG_MAX_FLASH_BANKS) {
+		puts ("Warning: not all Flashes are initialised !");
+		return flash_size;
+	}
+
+	bank_size = flash_get_size (CFG_FLASH_BASE, flash_info + bank);
+	if (bank_size) {
+#if CFG_MONITOR_BASE >= CFG_FLASH_BASE && \
+    CFG_MONITOR_BASE < CFG_FLASH_BASE + CFG_MAX_FLASH_SIZE
+		/* monitor protection ON by default */
+		flash_protect(FLAG_PROTECT_SET,
+			      CFG_MONITOR_BASE,
+			      CFG_MONITOR_BASE + CFG_MONITOR_LEN - 1,
+			      flash_info + bank);
+#endif
+
+#ifdef CFG_ENV_IS_IN_FLASH
+		/* ENV protection ON by default */
+		flash_protect(FLAG_PROTECT_SET,
+			      CFG_ENV_ADDR,
+			      CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1,
+			      flash_info + bank);
+#endif
+
+		/* HWC protection ON by default */
+		flash_protect(FLAG_PROTECT_SET,
+			      CFG_FLASH_BASE,
+			      CFG_FLASH_BASE + 0x10000 - 1,
+			      flash_info + bank);
+
+		flash_size += bank_size;
+		bank++;
+	} else {
+		puts ("Warning: the BOOT Flash is not initialised !");
+	}
+
+	return flash_size;
+}
+
+/*
+ * The following code cannot be run from FLASH!
+ */
+static ulong flash_get_size (u32 addr, flash_info_t *info)
+{
+	volatile uchar value;
+#if 0
+	int i;
+#endif
+
+	/* Write auto select command: read Manufacturer ID */
+	out8(addr + 0x0555, 0xAA);
+	iobarrier_rw();
+	udelay(10);
+	out8(addr + 0x02AA, 0x55);
+	iobarrier_rw();
+	udelay(10);
+	out8(addr + 0x0555, 0x90);
+	iobarrier_rw();
+	udelay(10);
+
+	value = in8(addr);
+	iobarrier_rw();
+	udelay(10);
+	switch (value | (value << 16)) {
+	case AMD_MANUFACT:
+		info->flash_id = FLASH_MAN_AMD;
+		break;
+
+	case FUJ_MANUFACT:
+		info->flash_id = FLASH_MAN_FUJ;
+		break;
+
+	default:
+		info->flash_id = FLASH_UNKNOWN;
+		flash_reset (addr);
+		return 0;
+	}
+
+	value = in8(addr + 1);			/* device ID		*/
+	iobarrier_rw();
+
+	switch (value) {
+	case AMD_ID_LV033C:
+		info->flash_id += FLASH_AM033C;
+		info->size = hwc_flash_size();
+		if (info->size > CFG_MAX_FLASH_SIZE) {
+			printf("U-Boot supports only %d MB\n",
+			       CFG_MAX_FLASH_SIZE);
+			info->size = CFG_MAX_FLASH_SIZE;
+		}
+		info->sector_count = info->size / 0x10000;
+		break;				/* => 4 MB		*/
+
+	default:
+		info->flash_id = FLASH_UNKNOWN;
+		flash_reset (addr);
+		return (0);			/* => no or unknown flash */
+
+	}
+
+	if (!flash_get_offsets (addr, info)) {
+		flash_reset (addr);
+		return 0;
+	}
+
+#if 0
+	/* check for protected sectors */
+	for (i = 0; i < info->sector_count; i++) {
+		/* read sector protection at sector address, (A7 .. A0) = 0x02 */
+		/* D0 = 1 if protected */
+		value = in8(info->start[i] + 2);
+		iobarrier_rw();
+		info->protect[i] = (value & 1) != 0;
+	}
+#endif
+
+	/*
+	 * Reset bank to read mode
+	 */
+	flash_reset (addr);
+
+	return (info->size);
+}
+
+static int flash_get_offsets (u32 base, flash_info_t *info)
+{
+	unsigned int i, size;
+
+	switch (info->flash_id & FLASH_TYPEMASK) {
+	case FLASH_AM033C:
+		/* set sector offsets for uniform sector type	*/
+		size = info->size / info->sector_count;
+		for (i = 0; i < info->sector_count; i++) {
+			info->start[i] = base + i * size;
+		}
+		break;
+	default:
+		return 0;
+	}
+
+	return 1;
+}
+
+int flash_erase (flash_info_t *info, int s_first, int s_last)
+{
+	volatile u32 addr = 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;
+	}
+
+	if (info->flash_id == FLASH_UNKNOWN ||
+	    info->flash_id > FLASH_AMD_COMP) {
+		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");
+	}
+
+	l_sect = -1;
+
+	/* Disable interrupts which might cause a timeout here */
+	flag = disable_interrupts();
+
+	out8(addr + 0x555, 0xAA);
+	iobarrier_rw();
+	out8(addr + 0x2AA, 0x55);
+	iobarrier_rw();
+	out8(addr + 0x555, 0x80);
+	iobarrier_rw();
+	out8(addr + 0x555, 0xAA);
+	iobarrier_rw();
+	out8(addr + 0x2AA, 0x55);
+	iobarrier_rw();
+
+	/* Start erase on unprotected sectors */
+	for (sect = s_first; sect<=s_last; sect++) {
+		if (info->protect[sect] == 0) {	/* not protected */
+			addr = info->start[sect];
+			out8(addr, 0x30);
+			iobarrier_rw();
+			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 = info->start[l_sect];
+	while ((in8(addr) & 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 */
+			putc ('.');
+			last = now;
+		}
+		iobarrier_rw();
+	}
+
+DONE:
+	/* reset to read mode */
+	flash_reset (info->start[0]);
+
+	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)
+{
+	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 u32 addr = info->start[0];
+	ulong start;
+	int flag, i;
+
+	/* Check if Flash is (sufficiently) erased */
+	if ((in32(dest) & data) != data) {
+		return (2);
+	}
+	/* Disable interrupts which might cause a timeout here */
+	flag = disable_interrupts();
+
+	/* first, perform an unlock bypass command to speed up flash writes */
+	out8(addr + 0x555, 0xAA);
+	iobarrier_rw();
+	out8(addr + 0x2AA, 0x55);
+	iobarrier_rw();
+	out8(addr + 0x555, 0x20);
+	iobarrier_rw();
+
+	/* write each byte out */
+	for (i = 0; i < 4; i++) {
+		char *data_ch = (char *)&data;
+		out8(addr, 0xA0);
+		iobarrier_rw();
+		out8(dest+i, data_ch[i]);
+		iobarrier_rw();
+		udelay(10); /* XXX */
+	}
+
+	/* we're done, now do an unlock bypass reset */
+	out8(addr, 0x90);
+	iobarrier_rw();
+	out8(addr, 0x00);
+	iobarrier_rw();
+
+	/* re-enable interrupts if necessary */
+	if (flag)
+		enable_interrupts();
+
+	/* data polling for D7 */
+	start = get_timer (0);
+	while ((in32(dest) & 0x80808080) != (data & 0x80808080)) {
+		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
+			return (1);
+		}
+		iobarrier_rw();
+	}
+
+	flash_reset (addr);
+
+	return (0);
+}
+
+/*
+ * Reset bank to read mode
+ */
+static void flash_reset (u32 addr)
+{
+	out8(addr, 0xF0);	/* reset bank */
+	iobarrier_rw();
+}
+
+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_AMD:	printf ("AMD ");		break;
+	case FLASH_MAN_FUJ:	printf ("FUJITSU ");		break;
+	case FLASH_MAN_BM:	printf ("BRIGHT MICRO ");	break;
+	default:		printf ("Unknown Vendor ");	break;
+	}
+
+	switch (info->flash_id & FLASH_TYPEMASK) {
+	case FLASH_AM033C:	printf ("AM29LV033C (32 Mbit, uniform sectors)\n");
+				break;
+	default:		printf ("Unknown Chip Type\n");
+				break;
+	}
+
+	if (info->size % 0x100000 == 0) {
+		printf ("  Size: %ld MB in %d Sectors\n",
+			info->size / 0x100000, info->sector_count);
+	}
+	else if (info->size % 0x400 == 0) {
+		printf ("  Size: %ld KB in %d Sectors\n",
+			info->size / 0x400, info->sector_count);
+	}
+	else {
+		printf ("  Size: %ld B in %d Sectors\n",
+			info->size, 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");
+}