init commit via android 4.4 uboot

1 files changed, 809 insertions, 0 deletions

diff --git a/board/sc520_spunk/flash.c b/board/sc520_spunk/flash.c
new file mode 100755
index 0000000..4942e59
--- /dev/null
+++ b/board/sc520_spunk/flash.c
@@ -0,0 +1,809 @@
+/*
+ * (C) Copyright 2002, 2003
+ * Daniel Engström, Omicron Ceti AB, daniel@omicron.se
+ *
+ * (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>
+#include <asm/io.h>
+#include <pci.h>
+#include <asm/ic/sc520.h>
+
+#define PROBE_BUFFER_SIZE 1024
+static unsigned char buffer[PROBE_BUFFER_SIZE];
+
+
+#define SC520_MAX_FLASH_BANKS  1
+#define SC520_FLASH_BANK0_BASE 0x38000000  /* BOOTCS */
+#define SC520_FLASH_BANKSIZE   0x8000000
+
+#define A29LV641DH_SIZE        0x800000
+#define A29LV641DH_SECTORS     128
+
+#define A29LV641MH_SIZE        0x800000
+#define A29LV641MH_SECTORS     128
+
+#define I28F320J3A_SIZE        0x400000
+#define I28F320J3A_SECTORS     32
+
+#define I28F640J3A_SIZE        0x800000
+#define I28F640J3A_SECTORS     64
+
+#define I28F128J3A_SIZE        0x1000000
+#define I28F128J3A_SECTORS     128
+
+flash_info_t    flash_info[SC520_MAX_FLASH_BANKS];
+
+#define READY 1
+#define ERR   2
+#define TMO   4
+
+/*-----------------------------------------------------------------------
+ */
+
+
+static u32 _probe_flash(u32 addr, u32 bw, int il)
+{
+	u32 result=0;
+
+	/* First do an unlock cycle for the benefit of
+	 * devices that need it */
+
+	switch (bw) {
+
+	case 1:
+		*(volatile u8*)(addr+0x5555) = 0xaa;
+		*(volatile u8*)(addr+0x2aaa) = 0x55;
+		*(volatile u8*)(addr+0x5555) = 0x90;
+
+		/* Read vendor */
+		result = *(volatile u8*)addr;
+		result <<= 16;
+
+		/* Read device */
+		result |= *(volatile u8*)(addr+2);
+
+		/* Return device to data mode */
+		*(volatile u8*)addr = 0xff;
+		*(volatile u8*)(addr+0x5555), 0xf0;
+		break;
+
+	case 2:
+		*(volatile u16*)(addr+0xaaaa) = 0xaaaa;
+		*(volatile u16*)(addr+0x5554) = 0x5555;
+
+		/* Issue identification command */
+		if (il == 2) {
+			*(volatile u16*)(addr+0xaaaa) = 0x9090;
+
+			/* Read vendor */
+			result = *(volatile u8*)addr;
+			result <<= 16;
+
+			/* Read device */
+			result |= *(volatile u8*)(addr+2);
+
+			/* Return device to data mode */
+			*(volatile u16*)addr =  0xffff;
+			*(volatile u16*)(addr+0xaaaa), 0xf0f0;
+
+		} else {
+			*(volatile u8*)(addr+0xaaaa) = 0x90;
+			/* Read vendor */
+			result = *(volatile u16*)addr;
+			result <<= 16;
+
+			/* Read device */
+			result |= *(volatile u16*)(addr+2);
+
+			/* Return device to data mode */
+			*(volatile u8*)addr = 0xff;
+			*(volatile u8*)(addr+0xaaaa), 0xf0;
+		}
+
+		break;
+
+	 case 4:
+		*(volatile u32*)(addr+0x5554) = 0xaaaaaaaa;
+		*(volatile u32*)(addr+0xaaa8) = 0x55555555;
+
+		switch (il) {
+		case 1:
+			/* Issue identification command */
+			*(volatile u8*)(addr+0x5554) = 0x90;
+
+			/* Read vendor */
+			result = *(volatile u16*)addr;
+			result <<= 16;
+
+			/* Read device */
+			result |= *(volatile u16*)(addr+4);
+
+			/* Return device to data mode */
+			*(volatile u8*)addr =  0xff;
+			*(volatile u8*)(addr+0x5554), 0xf0;
+			break;
+
+		case 2:
+			/* Issue identification command */
+			*(volatile u32*)(addr + 0x5554) = 0x00900090;
+
+			/* Read vendor */
+			result = *(volatile u16*)addr;
+			result <<= 16;
+
+			/* Read device */
+			result |= *(volatile u16*)(addr+4);
+
+			/* Return device to data mode */
+			*(volatile u32*)addr =  0x00ff00ff;
+			*(volatile u32*)(addr+0x5554), 0x00f000f0;
+			break;
+
+		case 4:
+			/* Issue identification command */
+			*(volatile u32*)(addr+0x5554) = 0x90909090;
+
+			/* Read vendor */
+			result = *(volatile u8*)addr;
+			result <<= 16;
+
+			/* Read device */
+			result |= *(volatile u8*)(addr+4);
+
+			/* Return device to data mode */
+			*(volatile u32*)addr =  0xffffffff;
+			*(volatile u32*)(addr+0x5554), 0xf0f0f0f0;
+			break;
+		}
+		break;
+	}
+
+
+	return result;
+}
+
+extern int _probe_flash_end;
+asm ("_probe_flash_end:\n"
+     ".long 0\n");
+
+static int identify_flash(unsigned address, int width)
+{
+	int is;
+	int device;
+	int vendor;
+	int size;
+	unsigned res;
+
+	u32 (*_probe_flash_ptr)(u32 a, u32 bw, int il);
+
+	size = (unsigned)&_probe_flash_end - (unsigned)_probe_flash;
+
+	if (size > PROBE_BUFFER_SIZE) {
+		printf("_probe_flash() routine too large (%d) %p - %p\n",
+		       size, &_probe_flash_end, _probe_flash);
+		return 0;
+	}
+
+	memcpy(buffer, _probe_flash, size);
+	_probe_flash_ptr = (void*)buffer;
+
+	is = disable_interrupts();
+	res = _probe_flash_ptr(address, width, 1);
+	if (is) {
+		enable_interrupts();
+	}
+
+
+	vendor = res >> 16;
+	device = res & 0xffff;
+
+
+	return res;
+}
+
+ulong flash_init(void)
+{
+	int i, j;
+	ulong size = 0;
+
+	for (i = 0; i < SC520_MAX_FLASH_BANKS; i++) {
+		unsigned id;
+		ulong flashbase = 0;
+		int sectsize = 0;
+
+		memset(flash_info[i].protect, 0, CFG_MAX_FLASH_SECT);
+		switch (i) {
+		case 0:
+			flashbase = SC520_FLASH_BANK0_BASE;
+			break;
+		default:
+			panic("configured too many flash banks!\n");
+		}
+
+		id = identify_flash(flashbase, 2);
+		switch (id) {
+		case 0x000122d7:
+			/* 29LV641DH */
+			flash_info[i].flash_id =
+				(AMD_MANUFACT & FLASH_VENDMASK) |
+				(AMD_ID_LV640U & FLASH_TYPEMASK);
+
+			flash_info[i].size = A29LV641DH_SIZE;
+			flash_info[i].sector_count = A29LV641DH_SECTORS;
+			sectsize = A29LV641DH_SIZE/A29LV641DH_SECTORS;
+			printf("Bank %d: AMD 29LV641DH\n", i);
+			break;
+
+		case 0x0001227E:
+			/* 29LV641MH */
+			flash_info[i].flash_id =
+				(AMD_MANUFACT & FLASH_VENDMASK) |
+				(AMD_ID_DL640 & FLASH_TYPEMASK);
+
+			flash_info[i].size = A29LV641MH_SIZE;
+			flash_info[i].sector_count = A29LV641MH_SECTORS;
+			sectsize = A29LV641MH_SIZE/A29LV641MH_SECTORS;
+			printf("Bank %d: AMD 29LV641MH\n", i);
+			break;
+
+		case 0x00890016:
+			/* 28F320J3A */
+			flash_info[i].flash_id =
+				(INTEL_MANUFACT & FLASH_VENDMASK) |
+				(INTEL_ID_28F320J3A & FLASH_TYPEMASK);
+
+			flash_info[i].size = I28F320J3A_SIZE;
+			flash_info[i].sector_count = I28F320J3A_SECTORS;
+			sectsize = I28F320J3A_SIZE/I28F320J3A_SECTORS;
+			printf("Bank %d: Intel 28F320J3A\n", i);
+			break;
+
+		case 0x00890017:
+			/* 28F640J3A */
+			flash_info[i].flash_id =
+				(INTEL_MANUFACT & FLASH_VENDMASK) |
+				(INTEL_ID_28F640J3A & FLASH_TYPEMASK);
+
+			flash_info[i].size = I28F640J3A_SIZE;
+			flash_info[i].sector_count = I28F640J3A_SECTORS;
+			sectsize = I28F640J3A_SIZE/I28F640J3A_SECTORS;
+			printf("Bank %d: Intel 28F640J3A\n", i);
+			break;
+
+		case 0x00890018:
+			/* 28F128J3A */
+			flash_info[i].flash_id =
+				(INTEL_MANUFACT & FLASH_VENDMASK) |
+				(INTEL_ID_28F128J3A & FLASH_TYPEMASK);
+
+			flash_info[i].size = I28F128J3A_SIZE;
+			flash_info[i].sector_count = I28F128J3A_SECTORS;
+			sectsize = I28F128J3A_SIZE/I28F128J3A_SECTORS;
+			printf("Bank %d: Intel 28F128J3A\n", i);
+			break;
+
+		default:
+			printf("Bank %d have unknown flash %08x\n", i, id);
+			flash_info[i].flash_id = FLASH_UNKNOWN;
+			continue;
+		}
+
+		for (j = 0; j < flash_info[i].sector_count; j++) {
+			flash_info[i].start[j] = flashbase + j * sectsize;
+		}
+		size += flash_info[i].size;
+
+		flash_protect(FLAG_PROTECT_CLEAR,
+			      flash_info[i].start[0],
+			       flash_info[i].start[0] + flash_info[i].size - 1,
+			      &flash_info[i]);
+	}
+
+	/*
+	 * Protect monitor and environment sectors
+	 */
+	flash_protect(FLAG_PROTECT_SET,
+		      i386boot_start,
+		      i386boot_end,
+		      &flash_info[0]);
+#ifdef CFG_ENV_ADDR
+	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;
+
+	switch (info->flash_id & FLASH_VENDMASK) {
+	case (INTEL_MANUFACT & FLASH_VENDMASK):
+		printf("INTEL: ");
+		switch (info->flash_id & FLASH_TYPEMASK) {
+		case (INTEL_ID_28F320J3A & FLASH_TYPEMASK):
+			printf("1x I28F320J3A (32Mbit)\n");
+			break;
+		case (INTEL_ID_28F640J3A & FLASH_TYPEMASK):
+			printf("1x I28F640J3A (64Mbit)\n");
+			break;
+		case (INTEL_ID_28F128J3A & FLASH_TYPEMASK):
+			printf("1x I28F128J3A (128Mbit)\n");
+			break;
+		default:
+			printf("Unknown Chip Type\n");
+			goto done;
+			break;
+		}
+
+		break;
+
+	case (AMD_MANUFACT & FLASH_VENDMASK):
+		printf("AMD:   ");
+		switch (info->flash_id & FLASH_TYPEMASK) {
+		case (AMD_ID_LV640U & FLASH_TYPEMASK):
+			printf("1x AMD29LV641DH (64Mbit)\n");
+			break;
+		case (AMD_ID_DL640 & FLASH_TYPEMASK):
+			printf("1x AMD29LV641MH (64Mbit)\n");
+			break;
+		default:
+			printf("Unknown Chip Type\n");
+			goto done;
+			break;
+		}
+
+		break;
+	default:
+		printf("Unknown Vendor ");
+		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:
+}
+
+/*-----------------------------------------------------------------------
+ */
+
+
+static u32 _amd_erase_flash(u32 addr, u32 sector)
+{
+	unsigned elapsed;
+
+	/* Issue erase */
+	*(volatile u16*)(addr + 0xaaaa) = 0x00AA;
+	*(volatile u16*)(addr + 0x5554) = 0x0055;
+	*(volatile u16*)(addr + 0xaaaa) = 0x0080;
+	/* And one unlock */
+	*(volatile u16*)(addr + 0xaaaa) = 0x00AA;
+	*(volatile u16*)(addr + 0x5554) = 0x0055;
+	/* Sector erase command comes last */
+	*(volatile u16*)(addr + sector) = 0x0030;
+
+	elapsed = *(volatile u16*)(0xfffef000+SC520_SWTMRMILLI); /* dummy read */
+	elapsed = 0;
+	while (((*(volatile u16*)(addr + sector)) & 0x0080) != 0x0080) {
+
+		elapsed += *(volatile u16*)(0xfffef000+SC520_SWTMRMILLI);
+		if (elapsed > ((CFG_FLASH_ERASE_TOUT/CFG_HZ) * 1000)) {
+			*(volatile u16*)(addr) = 0x00f0;
+			return 1;
+		}
+	}
+
+	*(volatile u16*)(addr) = 0x00f0;
+
+	return 0;
+}
+
+extern int _amd_erase_flash_end;
+asm ("_amd_erase_flash_end:\n"
+     ".long 0\n");
+
+/* this needs to be inlined, the SWTMRMMILLI register is reset by each read */
+#define __udelay(delay) \
+{	\
+	unsigned micro; \
+	unsigned milli=0; \
+	\
+	micro = *(volatile u16*)(0xfffef000+SC520_SWTMRMILLI); \
+	 \
+	for (;;) { \
+		\
+		milli += *(volatile u16*)(0xfffef000+SC520_SWTMRMILLI); \
+		micro = *(volatile u16*)(0xfffef000+SC520_SWTMRMICRO); \
+		\
+		if ((delay) <= (micro + (milli * 1000))) { \
+			break; \
+		} \
+	} \
+} while (0)
+
+static u32 _intel_erase_flash(u32 addr, u32 sector)
+{
+	unsigned elapsed;
+
+	*(volatile u16*)(addr + sector) = 0x0050;   /* clear status register */
+	*(volatile u16*)(addr + sector) = 0x0020;   /* erase setup */
+	*(volatile u16*)(addr + sector) = 0x00D0;   /* erase confirm */
+
+
+	/* Wait at least 80us - let's wait 1 ms */
+	__udelay(1000);
+
+	elapsed = 0;
+	while (((*(volatile u16*)(addr + sector)) & 0x0080) != 0x0080) {
+		elapsed += *(volatile u16*)(0xfffef000+SC520_SWTMRMILLI);
+		if (elapsed > ((CFG_FLASH_ERASE_TOUT/CFG_HZ) * 1000)) {
+			*(volatile u16*)(addr + sector) = 0x00B0;  /* suspend erase      */
+			*(volatile u16*)(addr + sector) = 0x00FF;  /* reset to read mode */
+			return 1;
+		}
+	}
+
+	*(volatile u16*)(addr + sector) = 0x00FF;  /* reset to read mode */
+
+	return 0;
+}
+
+
+extern int _intel_erase_flash_end;
+asm ("_intel_erase_flash_end:\n"
+     ".long 0\n");
+
+int flash_erase(flash_info_t *info, int s_first, int s_last)
+{
+	u32 (*_erase_flash_ptr)(u32 a, u32 so);
+	int prot;
+	int sect;
+	unsigned size;
+
+	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_VENDMASK) == (AMD_MANUFACT & FLASH_VENDMASK)) {
+		size = (unsigned)&_amd_erase_flash_end - (unsigned)_amd_erase_flash;
+
+		if (size > PROBE_BUFFER_SIZE) {
+			printf("_amd_erase_flash() routine too large (%d) %p - %p\n",
+			       size, &_amd_erase_flash_end, _amd_erase_flash);
+			return 0;
+		}
+
+		memcpy(buffer, _amd_erase_flash, size);
+		_erase_flash_ptr = (void*)buffer;
+
+	} else if ((info->flash_id & FLASH_VENDMASK) == (INTEL_MANUFACT & FLASH_VENDMASK)) {
+		size = (unsigned)&_intel_erase_flash_end - (unsigned)_intel_erase_flash;
+
+		if (size > PROBE_BUFFER_SIZE) {
+			printf("_intel_erase_flash() routine too large (%d) %p - %p\n",
+			       size, &_intel_erase_flash_end, _intel_erase_flash);
+			return 0;
+		}
+
+		memcpy(buffer, _intel_erase_flash, size);
+		_erase_flash_ptr = (void*)buffer;
+	} else {
+		printf ("Can't erase unknown flash type - aborted\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");
+	}
+
+
+	/* Start erase on unprotected sectors */
+	for (sect = s_first; sect<=s_last; sect++) {
+
+		if (info->protect[sect] == 0) { /* not protected */
+			int res;
+			int flag;
+
+			/* Disable interrupts which might cause a timeout here */
+			flag = disable_interrupts();
+
+			res = _erase_flash_ptr(info->start[0], info->start[sect]-info->start[0]);
+
+			/* re-enable interrupts if necessary */
+			if (flag) {
+				enable_interrupts();
+			}
+
+
+			if (res) {
+				printf("Erase timed out, sector %d\n", sect);
+				return res;
+			}
+
+			putc('.');
+		}
+	}
+
+
+	return 0;
+}
+
+/*-----------------------------------------------------------------------
+ * Write a word to Flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+static int _amd_write_word(unsigned start, unsigned dest, unsigned data)
+{
+	volatile u16 *addr2 = (u16*)start;
+	volatile u16 *dest2 = (u16*)dest;
+	volatile u16 *data2 = (u16*)&data;
+	int i;
+	unsigned elapsed;
+
+	/* Check if Flash is (sufficiently) erased */
+	if ((*((volatile u16*)dest) & (u16)data) != (u16)data) {
+		return 2;
+	}
+
+	for (i = 0; i < 2; i++) {
+
+
+		addr2[0x5555] = 0x00AA;
+		addr2[0x2aaa] = 0x0055;
+		addr2[0x5555] = 0x00A0;
+
+		dest2[i] = (data >> (i*16)) & 0xffff;
+
+		elapsed = *(volatile u16*)(0xfffef000+SC520_SWTMRMILLI); /* dummy read */
+		elapsed = 0;
+
+		/* data polling for D7 */
+		while ((dest2[i] & 0x0080) != (data2[i] & 0x0080)) {
+			elapsed += *(volatile u16*)(0xfffef000+SC520_SWTMRMILLI);
+			if (elapsed > ((CFG_FLASH_WRITE_TOUT/CFG_HZ) * 1000)) {
+				addr2[i] = 0x00f0;
+				return 1;
+			}
+		}
+	}
+
+	addr2[i] = 0x00f0;
+
+	return 0;
+}
+
+extern int _amd_write_word_end;
+asm ("_amd_write_word_end:\n"
+     ".long 0\n");
+
+
+static int _intel_write_word(unsigned start, unsigned dest, unsigned data)
+{
+	int i;
+	unsigned elapsed;
+
+	/* Check if Flash is (sufficiently) erased */
+	if ((*((volatile u16*)dest) & (u16)data) != (u16)data) {
+		return 2;
+	}
+
+	for (i = 0; i < 2; i++) {
+
+		*(volatile u16*)(dest+2*i) = 0x0040; /* write setup */
+		*(volatile u16*)(dest+2*i) = (data >> (i*16)) & 0xffff;
+
+		elapsed = *(volatile u16*)(0xfffef000+SC520_SWTMRMILLI); /* dummy read */
+		elapsed = 0;
+
+		/* data polling for D7 */
+		while ((*(volatile u16*)dest & 0x0080) != 0x0080) {
+			elapsed += *(volatile u16*)(0xfffef000+SC520_SWTMRMILLI);
+			if (elapsed > ((CFG_FLASH_WRITE_TOUT/CFG_HZ) * 1000)) {
+				*(volatile u16*)dest = 0x00ff;
+				return 1;
+			}
+		}
+	}
+
+	*(volatile u16*)dest = 0x00ff;
+
+
+	return 0;
+
+}
+
+extern int _intel_write_word_end;
+asm ("_intel_write_word_end:\n"
+     ".long 0\n");
+
+
+/*-----------------------------------------------------------------------
+ * Copy memory to flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ * 3 - Unsupported flash type
+ */
+
+int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
+{
+	ulong cp, wp, data;
+	int i, l, rc;
+	int flag;
+	u32 (*_write_word_ptr)(unsigned start, unsigned dest, unsigned data);
+	unsigned size;
+
+	if ((info->flash_id & FLASH_VENDMASK) == (AMD_MANUFACT & FLASH_VENDMASK)) {
+		size = (unsigned)&_amd_write_word_end - (unsigned)_amd_write_word;
+
+		if (size > PROBE_BUFFER_SIZE) {
+			printf("_amd_write_word() routine too large (%d) %p - %p\n",
+			       size, &_amd_write_word_end, _amd_write_word);
+			return 0;
+		}
+
+		memcpy(buffer, _amd_write_word, size);
+		_write_word_ptr = (void*)buffer;
+
+	} else if ((info->flash_id & FLASH_VENDMASK) == (INTEL_MANUFACT & FLASH_VENDMASK)) {
+		size = (unsigned)&_intel_write_word_end - (unsigned)_intel_write_word;
+
+		if (size > PROBE_BUFFER_SIZE) {
+			printf("_intel_write_word() routine too large (%d) %p - %p\n",
+			       size, &_intel_write_word_end, _intel_write_word);
+			return 0;
+		}
+
+		memcpy(buffer, _intel_write_word, size);
+		_write_word_ptr = (void*)buffer;
+	} else {
+		printf ("Can't program unknown flash type - aborted\n");
+		return 3;
+	}
+
+
+	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 |= (*(uchar *)cp) << (8*i);
+		}
+		for (; i<4 && cnt>0; ++i) {
+			data |= *src++ << (8*i);
+			--cnt;
+			++cp;
+		}
+		for (; cnt==0 && i<4; ++i, ++cp) {
+			data |= (*(uchar *)cp)  << (8*i);
+		}
+
+		/* Disable interrupts which might cause a timeout here */
+		flag = disable_interrupts();
+
+		rc = _write_word_ptr(info->start[0], wp, data);
+
+		/* re-enable interrupts if necessary */
+		if (flag) {
+			enable_interrupts();
+		}
+		if (rc != 0) {
+			return rc;
+		}
+		wp += 4;
+	}
+
+	/*
+	 * handle word aligned part
+	 */
+	while (cnt >= 4) {
+		data = 0;
+
+		for (i=0; i<4; ++i) {
+			data |= *src++ << (8*i);
+		}
+
+		/* Disable interrupts which might cause a timeout here */
+		flag = disable_interrupts();
+
+		rc = _write_word_ptr(info->start[0], wp, data);
+
+		/* re-enable interrupts if necessary */
+		if (flag) {
+			enable_interrupts();
+		}
+		if (rc != 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 |= *src++ << (8*i);
+		--cnt;
+	}
+
+	for (; i<4; ++i, ++cp) {
+		data |= (*(uchar *)cp) << (8*i);
+	}
+
+	/* Disable interrupts which might cause a timeout here */
+	flag = disable_interrupts();
+
+	rc = _write_word_ptr(info->start[0], wp, data);
+
+	/* re-enable interrupts if necessary */
+	if (flag) {
+		enable_interrupts();
+	}
+
+	return rc;
+
+}