mtd.patch

patches for linux-2.6.

+		if (chip->state != mode) {
 			/* Someone's suspended the write. Sleep */
 			DECLARE_WAITQUEUE(wait, current);
 
@@ -1331,23 +1311,22 @@
 		
 		/* OK Still waiting */
 		if (time_after(jiffies, timeo)) {
+			map_write(map, CMD(0x70), adr);
 			chip->state = FL_STATUS;
 			xip_enable(map, chip, adr);
-			printk(KERN_ERR "waiting for chip to be ready timed out in word write\n");
+			printk(KERN_ERR "%s: word write error (status timeout)\n", map->name);
 			ret = -EIO;
 			goto out;
 		}
 
 		/* Latency issues. Drop the lock, wait a while and retry */
-		spin_unlock(chip->mutex);
 		z++;
 		UDELAY(map, chip, adr, 1);
-		spin_lock(chip->mutex);
 	}
 	if (!z) {
 		chip->word_write_time--;
 		if (!chip->word_write_time)
-			chip->word_write_time++;
+			chip->word_write_time = 1;
 	}
 	if (z > 1) 
 		chip->word_write_time++;
@@ -1355,19 +1334,31 @@
 	/* Done and happy. */
 	chip->state = FL_STATUS;
 
-	/* check for lock bit */
-	if (map_word_bitsset(map, status, CMD(0x02))) {
-		/* clear status */
+	/* check for errors */
+	if (map_word_bitsset(map, status, CMD(0x1a))) {
+		unsigned long chipstatus = MERGESTATUS(status);
+
+		/* reset status */
 		map_write(map, CMD(0x50), adr);
-		/* put back into read status register mode */
 		map_write(map, CMD(0x70), adr);
-		ret = -EROFS;
+		xip_enable(map, chip, adr);
+
+		if (chipstatus & 0x02) {
+			ret = -EROFS;
+		} else if (chipstatus & 0x08) {
+			printk(KERN_ERR "%s: word write error (bad VPP)\n", map->name);
+			ret = -EIO;
+		} else {
+			printk(KERN_ERR "%s: word write error (status 0x%lx)\n", map->name, chipstatus);
+			ret = -EINVAL;
+		}
+
+		goto out;
 	}
 
 	xip_enable(map, chip, adr);
  out:	put_chip(map, chip, adr);
 	spin_unlock(chip->mutex);
-
 	return ret;
 }
 
@@ -1399,7 +1390,7 @@
 		datum = map_word_load_partial(map, datum, buf, gap, n);
 
 		ret = do_write_oneword(map, &cfi->chips[chipnum],
-					       bus_ofs, datum);
+					       bus_ofs, datum, FL_WRITING);
 		if (ret) 
 			return ret;
 
@@ -1420,7 +1411,7 @@
 		map_word datum = map_word_load(map, buf);
 
 		ret = do_write_oneword(map, &cfi->chips[chipnum],
-				ofs, datum);
+				       ofs, datum, FL_WRITING);
 		if (ret)
 			return ret;
 
@@ -1444,7 +1435,7 @@
 		datum = map_word_load_partial(map, datum, buf, 0, len);
 
 		ret = do_write_oneword(map, &cfi->chips[chipnum],
-					       ofs, datum);
+				       ofs, datum, FL_WRITING);
 		if (ret) 
 			return ret;
 		
@@ -1456,19 +1447,23 @@
 
 
 static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip, 
-				    unsigned long adr, const u_char *buf, int len)
+				    unsigned long adr, const struct kvec **pvec,
+				    unsigned long *pvec_seek, int len)
 {
 	struct cfi_private *cfi = map->fldrv_priv;
-	map_word status, status_OK;
+	map_word status, status_OK, write_cmd, datum;
 	unsigned long cmd_adr, timeo;
-	int wbufsize, z, ret=0, bytes, words;
+	int wbufsize, z, ret=0, word_gap, words;
+	const struct kvec *vec;
+	unsigned long vec_seek;
 
 	wbufsize = cfi_interleave(cfi) << cfi->cfiq->MaxBufWriteSize;
 	adr += chip->start;
 	cmd_adr = adr & ~(wbufsize-1);
-	
+
 	/* Let's determine this according to the interleave only once */
 	status_OK = CMD(0x80);
+	write_cmd = (cfi->cfiq->P_ID != 0x0200) ? CMD(0xe8) : CMD(0xe9);
 
 	spin_lock(chip->mutex);
 	ret = get_chip(map, chip, cmd_adr, FL_WRITING);
@@ -1500,15 +1495,13 @@
 
 	z = 0;
 	for (;;) {
-		map_write(map, CMD(0xe8), cmd_adr);
+		map_write(map, write_cmd, cmd_adr);
 
 		status = map_read(map, cmd_adr);
 		if (map_word_andequal(map, status, status_OK, status_OK))
 			break;
 
-		spin_unlock(chip->mutex);
 		UDELAY(map, chip, cmd_adr, 1);
-		spin_lock(chip->mutex);
 
 		if (++z > 20) {
 			/* Argh. Not ready for write to buffer */
@@ -1520,44 +1513,68 @@
 			map_write(map, CMD(0x50), cmd_adr);
 			map_write(map, CMD(0x70), cmd_adr);
 			xip_enable(map, chip, cmd_adr);
-			printk(KERN_ERR "Chip not ready for buffer write. status = %lx, Xstatus = %lx\n",
-			       status.x[0], Xstatus.x[0]);
+			printk(KERN_ERR "%s: Chip not ready for buffer write. status = %lx, Xstatus = %lx\n",
+			       map->name, status.x[0], Xstatus.x[0]);
 			ret = -EIO;
 			goto out;
 		}
 	}
 
+	/* Figure out the number of words to write */
+	word_gap = (-adr & (map_bankwidth(map)-1));
+	words = (len - word_gap + map_bankwidth(map) - 1) / map_bankwidth(map);
+	if (!word_gap) {
+		words--;
+	} else {
+		word_gap = map_bankwidth(map) - word_gap;
+		adr -= word_gap;
+		datum = map_word_ff(map);
+	}
+
 	/* Write length of data to come */
-	bytes = len & (map_bankwidth(map)-1);
-	words = len / map_bankwidth(map);
-	map_write(map, CMD(words - !bytes), cmd_adr );
+	map_write(map, CMD(words), cmd_adr );
 
 	/* Write data */
-	z = 0;
-	while(z < words * map_bankwidth(map)) {
-		map_word datum = map_word_load(map, buf);
-		map_write(map, datum, adr+z);
+	vec = *pvec;
+	vec_seek = *pvec_seek;
+	do {
+		int n = map_bankwidth(map) - word_gap;
+		if (n > vec->iov_len - vec_seek)
+			n = vec->iov_len - vec_seek;
+		if (n > len)
+			n = len;
 
-		z += map_bankwidth(map);
-		buf += map_bankwidth(map);
-	}
+		if (!word_gap && len < map_bankwidth(map))
+			datum = map_word_ff(map);
+			
+		datum = map_word_load_partial(map, datum,
+					      vec->iov_base + vec_seek, 
+					      word_gap, n);
 
-	if (bytes) {
-		map_word datum;
+		len -= n;
+		word_gap += n;
+		if (!len || word_gap == map_bankwidth(map)) {
+			map_write(map, datum, adr);
+			adr += map_bankwidth(map);
+			word_gap = 0;
+		}
 
-		datum = map_word_ff(map);
-		datum = map_word_load_partial(map, datum, buf, 0, bytes);
-		map_write(map, datum, adr+z);
-	}
+		vec_seek += n;
+		if (vec_seek == vec->iov_len) {
+			vec++;
+			vec_seek = 0;
+		}
+	} while (len);
+	*pvec = vec;
+	*pvec_seek = vec_seek;
 
 	/* GO GO GO */
 	map_write(map, CMD(0xd0), cmd_adr);
 	chip->state = FL_WRITING;
 
-	spin_unlock(chip->mutex);
-	INVALIDATE_CACHED_RANGE(map, adr, len);
-	UDELAY(map, chip, cmd_adr, chip->buffer_write_time);
-	spin_lock(chip->mutex);
+	INVALIDATE_CACHE_UDELAY(map, chip, 
+				cmd_adr, len,
+				chip->buffer_write_time);
 
 	timeo = jiffies + (HZ/2);
 	z = 0;
@@ -1581,23 +1598,22 @@
 
 		/* OK Still waiting */
 		if (time_after(jiffies, timeo)) {
+			map_write(map, CMD(0x70), cmd_adr);
 			chip->state = FL_STATUS;
 			xip_enable(map, chip, cmd_adr);
-			printk(KERN_ERR "waiting for chip to be ready timed out in bufwrite\n");
+			printk(KERN_ERR "%s: buffer write error (status timeout)\n", map->name);
 			ret = -EIO;
 			goto out;
 		}
 		
 		/* Latency issues. Drop the lock, wait a while and retry */
-		spin_unlock(chip->mutex);
-		UDELAY(map, chip, cmd_adr, 1);
 		z++;
-		spin_lock(chip->mutex);
+		UDELAY(map, chip, cmd_adr, 1);
 	}
 	if (!z) {
 		chip->buffer_write_time--;
 		if (!chip->buffer_write_time)
-			chip->buffer_write_time++;
+			chip->buffer_write_time = 1;
 	}
 	if (z > 1) 
 		chip->buffer_write_time++;
@@ -1605,13 +1621,26 @@
 	/* Done and happy. */
  	chip->state = FL_STATUS;
 
-	/* check for lock bit */
-	if (map_word_bitsset(map, status, CMD(0x02))) {
-		/* clear status */
+	/* check for errors */
+	if (map_word_bitsset(map, status, CMD(0x1a))) {
+		unsigned long chipstatus = MERGESTATUS(status);
+
+		/* reset status */
 		map_write(map, CMD(0x50), cmd_adr);
-		/* put back into read status register mode */
-		map_write(map, CMD(0x70), adr);
-		ret = -EROFS;
+		map_write(map, CMD(0x70), cmd_adr);
+		xip_enable(map, chip, cmd_adr);
+
+		if (chipstatus & 0x02) {
+			ret = -EROFS;
+		} else if (chipstatus & 0x08) {
+			printk(KERN_ERR "%s: buffer write error (bad VPP)\n", map->name);
+			ret = -EIO;
+		} else {
+			printk(KERN_ERR "%s: buffer write error (status 0x%lx)\n", map->name, chipstatus);
+			ret = -EINVAL;
+		}
+
+		goto out;
 	}
 
 	xip_enable(map, chip, cmd_adr);
@@ -1620,57 +1649,40 @@
 	return ret;
 }
 
-static int cfi_intelext_write_buffers (struct mtd_info *mtd, loff_t to, 
-				       size_t len, size_t *retlen, const u_char *buf)
+static int cfi_intelext_writev (struct mtd_info *mtd, const struct kvec *vecs,
+				unsigned long count, loff_t to, size_t *retlen)
 {
 	struct map_info *map = mtd->priv;
 	struct cfi_private *cfi = map->fldrv_priv;
 	int wbufsize = cfi_interleave(cfi) << cfi->cfiq->MaxBufWriteSize;
 	int ret = 0;
 	int chipnum;
-	unsigned long ofs;
+	unsigned long ofs, vec_seek, i;
+	size_t len = 0;
+
+	for (i = 0; i < count; i++)
+		len += vecs[i].iov_len;
 
 	*retlen = 0;
 	if (!len)
 		return 0;
 
 	chipnum = to >> cfi->chipshift;
-	ofs = to  - (chipnum << cfi->chipshift);
-
-	/* If it's not bus-aligned, do the first word write */
-	if (ofs & (map_bankwidth(map)-1)) {
-		size_t local_len = (-ofs)&(map_bankwidth(map)-1);
-		if (local_len > len)
-			local_len = len;
-		ret = cfi_intelext_write_words(mtd, to, local_len,
-					       retlen, buf);
-		if (ret)
-			return ret;
-		ofs += local_len;
-		buf += local_len;
-		len -= local_len;
+	ofs = to - (chipnum << cfi->chipshift);
+	vec_seek = 0;
 
-		if (ofs >> cfi->chipshift) {
-			chipnum ++;
-			ofs = 0;
-			if (chipnum == cfi->numchips)
-				return 0;
-		}
-	}
-
-	while(len) {
+	do {
 		/* We must not cross write block boundaries */
 		int size = wbufsize - (ofs & (wbufsize-1));
 
 		if (size > len)
 			size = len;
 		ret = do_write_buffer(map, &cfi->chips[chipnum], 
-				      ofs, buf, size);
+				      ofs, &vecs, &vec_seek, size);
 		if (ret)
 			return ret;
 
 		ofs += size;
-		buf += size;
 		(*retlen) += size;
 		len -= size;
 
@@ -1680,10 +1692,22 @@
 			if (chipnum == cfi->numchips)
 				return 0;
 		}
-	}
+	} while (len);
+
 	return 0;
 }
 
+static int cfi_intelext_write_buffers (struct mtd_info *mtd, loff_t to,
+				       size_t len, size_t *retlen, const u_char *buf)
+{
+	struct kvec vec;
+
+	vec.iov_base = (void *) buf;
+	vec.iov_len = len;
+
+	return cfi_intelext_writev(mtd, &vec, 1, to, retlen);
+}
+
 static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip,
 				      unsigned long adr, int len, void *thunk)
 {
@@ -1720,10 +1744,9 @@
 	chip->state = FL_ERASING;
 	chip->erase_suspended = 0;
 
-	spin_unlock(chip->mutex);
-	INVALIDATE_CACHED_RANGE(map, adr, len);
-	UDELAY(map, chip, adr, chip->erase_time*1000/2);
-	spin_lock(chip->mutex);
+	INVALIDATE_CACHE_UDELAY(map, chip,
+				adr, len,
+				chip->erase_time*1000/2);
 
 	/* FIXME. Use a timer to check this, and return immediately. */
 	/* Once the state machine's known to be working I'll do that */
@@ -1753,24 +1776,16 @@
 		
 		/* OK Still waiting */
 		if (time_after(jiffies, timeo)) {
-			map_word Xstatus;
 			map_write(map, CMD(0x70), adr);
 			chip->state = FL_STATUS;
-			Xstatus = map_read(map, adr);
-			/* Clear status bits */
-			map_write(map, CMD(0x50), adr);
-			map_write(map, CMD(0x70), adr);
 			xip_enable(map, chip, adr);
-			printk(KERN_ERR "waiting for erase at %08lx to complete timed out. status = %lx, Xstatus = %lx.\n",
-			       adr, status.x[0], Xstatus.x[0]);
+			printk(KERN_ERR "%s: block erase error: (status timeout)\n", map->name);
 			ret = -EIO;
 			goto out;
 		}