[PATCH 1/3] clean up the legacy interfaces in nandwrite.c

["Stanley.Miao" <stanley.miao@windriver.com>]

The "struct nand_oobinfo" is able to record only 32 ECC code positions,which
is not enough for many big NAND chips. Therefore, this structure is replaced
by "struct nand_ecclayout" in linux kernel from the version 2.6.17.
Consequently, the ioctl command changed from MEMGETOOBSEL to ECCGETLAYOUT.

Now update nandwrite to use the new ioctl command ECCGETLAYOUT. In order to
keep compatible with the old linux kernel, a linux version detection function
is added.

YAFFS and JFFS2 has updated and we don't need the arguments "forcelegacy",
"forcejffs2", "forceyaffs" anymore. Now clean them up.

Signed-off-by: Stanley.Miao <stanley.miao@windriver.com>
---
 nandwrite.c |  215 +++++++++++++---------------------------------------------
 1 files changed, 48 insertions(+), 167 deletions(-)

diff --git a/nandwrite.c b/nandwrite.c
index e691ebd..a0a843b 100644
--- a/nandwrite.c
+++ b/nandwrite.c
@@ -45,26 +45,21 @@
 #define MAX_PAGE_SIZE	4096
 #define MAX_OOB_SIZE	128
 
-// oob layouts to pass into the kernel as default
-static struct nand_oobinfo none_oobinfo = {
-	.useecc = MTD_NANDECC_OFF,
-};
-
-static struct nand_oobinfo jffs2_oobinfo = {
-	.useecc = MTD_NANDECC_PLACE,
-	.eccbytes = 6,
-	.eccpos = { 0, 1, 2, 3, 6, 7 }
-};
-
-static struct nand_oobinfo yaffs_oobinfo = {
-	.useecc = MTD_NANDECC_PLACE,
-	.eccbytes = 6,
-	.eccpos = { 8, 9, 10, 13, 14, 15}
-};
-
-static struct nand_oobinfo autoplace_oobinfo = {
-	.useecc = MTD_NANDECC_AUTOPLACE
-};
+#define LINUX_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
+
+static int get_linux_version(void)
+{
+	FILE *fd;
+	int a = 0, b = 0, c = 0;
+	
+	fd = fopen("/proc/version", "r");
+	if (fd) {
+		fscanf(fd, "Linux version %d.%d.%d", &a, &b, &c);
+		fclose(fd);
+	}
+
+	return LINUX_VERSION(a, b, c);
+}
 
 static void display_help (void)
 {
@@ -72,13 +67,7 @@ static void display_help (void)
 "Usage: nandwrite [OPTION] MTD_DEVICE [INPUTFILE|-]\n"
 "Writes to the specified MTD device.\n"
 "\n"
-"  -a, --autoplace         Use auto oob layout\n"
-"  -j, --jffs2             Force jffs2 oob layout (legacy support)\n"
-"  -y, --yaffs             Force yaffs oob layout (legacy support)\n"
-"  -f, --forcelegacy       Force legacy support on autoplacement-enabled mtd\n"
-"                          device\n"
 "  -m, --markbad           Mark blocks bad if write fails\n"
-"  -n, --noecc             Write without ecc\n"
 "  -o, --oob               Image contains oob data\n"
 "  -r, --raw               Image contains the raw oob data dumped by nanddump\n"
 "  -s addr, --start=addr   Set start address (default is 0)\n"
@@ -112,12 +101,7 @@ static int		mtdoffset = 0;
 static bool		quiet = false;
 static bool		writeoob = false;
 static bool		rawoob = false;
-static bool		autoplace = false;
 static bool		markbad = false;
-static bool		forcejffs2 = false;
-static bool		forceyaffs = false;
-static bool		forcelegacy = false;
-static bool		noecc = false;
 static bool		pad = false;
 static int		blockalign = 1; /*default to using 16K block size */
 
@@ -127,22 +111,17 @@ static void process_options (int argc, char * const argv[])
 
 	for (;;) {
 		int option_index = 0;
-		static const char *short_options = "ab:fjmnopqrs:y";
+		static const char *short_options = "b:mopqrs:";
 		static const struct option long_options[] = {
 			{"help", no_argument, 0, 0},
 			{"version", no_argument, 0, 0},
-			{"autoplace", no_argument, 0, 'a'},
 			{"blockalign", required_argument, 0, 'b'},
-			{"forcelegacy", no_argument, 0, 'f'},
-			{"jffs2", no_argument, 0, 'j'},
 			{"markbad", no_argument, 0, 'm'},
-			{"noecc", no_argument, 0, 'n'},
 			{"oob", no_argument, 0, 'o'},
 			{"pad", no_argument, 0, 'p'},
 			{"quiet", no_argument, 0, 'q'},
 			{"raw", no_argument, 0, 'r'},
 			{"start", required_argument, 0, 's'},
-			{"yaffs", no_argument, 0, 'y'},
 			{0, 0, 0, 0},
 		};
 
@@ -166,21 +145,6 @@ static void process_options (int argc, char * const argv[])
 			case 'q':
 				quiet = true;
 				break;
-			case 'a':
-				autoplace = true;
-				break;
-			case 'j':
-				forcejffs2 = true;
-				break;
-			case 'y':
-				forceyaffs = true;
-				break;
-			case 'f':
-				forcelegacy = true;
-				break;
-			case 'n':
-				noecc = true;
-				break;
 			case 'm':
 				markbad = true;
 				break;
@@ -258,8 +222,7 @@ int main(int argc, char * const argv[])
 	struct mtd_oob_buf oob;
 	loff_t offs;
 	int ret;
-	int oobinfochanged = 0;
-	struct nand_oobinfo old_oobinfo;
+	struct nand_ecclayout ecclayout;
 	bool failed = true;
 	// contains all the data read from the file so far for the current eraseblock
 	unsigned char *filebuf = NULL;
@@ -315,86 +278,30 @@ int main(int argc, char * const argv[])
 		exit(EXIT_FAILURE);
 	}
 
-	if (autoplace) {
-		/* Read the current oob info */
-		if (ioctl (fd, MEMGETOOBSEL, &old_oobinfo) != 0) {
-			perror ("MEMGETOOBSEL");
-			close (fd);
-			exit (EXIT_FAILURE);
-		}
-
-		// autoplace ECC ?
-		if (autoplace && (old_oobinfo.useecc != MTD_NANDECC_AUTOPLACE)) {
-
-			if (ioctl (fd, MEMSETOOBSEL, &autoplace_oobinfo) != 0) {
-				perror ("MEMSETOOBSEL");
-				close (fd);
-				exit (EXIT_FAILURE);
-			}
-			oobinfochanged = 1;
-		}
-	}
 
-	if (noecc)  {
-		ret = ioctl(fd, MTDFILEMODE, (void *) MTD_MODE_RAW);
-		if (ret == 0) {
-			oobinfochanged = 2;
-		} else {
-			switch (errno) {
-			case ENOTTY:
-				if (ioctl (fd, MEMGETOOBSEL, &old_oobinfo) != 0) {
-					perror ("MEMGETOOBSEL");
-					close (fd);
-					exit (EXIT_FAILURE);
-				}
-				if (ioctl (fd, MEMSETOOBSEL, &none_oobinfo) != 0) {
-					perror ("MEMSETOOBSEL");
-					close (fd);
-					exit (EXIT_FAILURE);
-				}
-				oobinfochanged = 1;
-				break;
-			default:
-				perror ("MTDFILEMODE");
-				close (fd);
-				exit (EXIT_FAILURE);
-			}
-		}
-	}
-
-	/*
-	 * force oob layout for jffs2 or yaffs ?
-	 * Legacy support
-	 */
-	if (forcejffs2 || forceyaffs) {
-		struct nand_oobinfo *oobsel = forcejffs2 ? &jffs2_oobinfo : &yaffs_oobinfo;
-
-		if (autoplace) {
-			fprintf(stderr, "Autoplacement is not possible for legacy -j/-y options\n");
-			goto restoreoob;
-		}
-		if ((old_oobinfo.useecc == MTD_NANDECC_AUTOPLACE) && !forcelegacy) {
-			fprintf(stderr, "Use -f option to enforce legacy placement on autoplacement enabled mtd device\n");
-			goto restoreoob;
-		}
-		if (meminfo.oobsize == 8) {
-			if (forceyaffs) {
-				fprintf (stderr, "YAFSS cannot operate on 256 Byte page size");
-				goto restoreoob;
-			}
-			/* Adjust number of ecc bytes */
-			jffs2_oobinfo.eccbytes = 3;
+	oob.length = meminfo.oobsize;
+	oob.ptr =  oobbuf;
+
+	memset(&ecclayout, 0, sizeof(ecclayout));
+	if (get_linux_version() > LINUX_VERSION(2, 6, 17)) {
+		if (ioctl(fd, ECCGETLAYOUT, &ecclayout) != 0) {
+			perror("ECCGETLAYOUT");
+			close(fd);
+			exit(EXIT_FAILURE);
 		}
+	} else {
+		struct nand_oobinfo oi;
 
-		if (ioctl (fd, MEMSETOOBSEL, oobsel) != 0) {
-			perror ("MEMSETOOBSEL");
-			goto restoreoob;
+		if (ioctl (fd, MEMGETOOBSEL, &oi) != 0) {
+			perror ("MEMGETOOBSEL");
+			close (fd);
+			exit (EXIT_FAILURE);
 		}
+		memcpy(&ecclayout.eccpos, &oi.eccpos, sizeof(oi.eccpos));
+		memcpy(&ecclayout.oobfree, &oi.oobfree, sizeof(oi.oobfree));
+		ecclayout.eccbytes = oi.eccbytes;
 	}
 
-	oob.length = meminfo.oobsize;
-	oob.ptr = noecc ? oobreadbuf : oobbuf;
-
 	/* Determine if we are reading from standard input or from a file. */
 	if (strcmp(img, standard_input) == 0) {
 		ifd = STDIN_FILENO;
@@ -558,6 +465,8 @@ int main(int argc, char * const argv[])
 		}
 
 		if (writeoob) {
+			int i, start, len;
+			int tags_pos = 0;
 			oobreadbuf = writebuf + meminfo.writesize;
 
 			// Read more data for the OOB from the input if there isn't enough in the buffer
@@ -594,40 +503,19 @@ int main(int argc, char * const argv[])
 				}
 			}
 
-			if (noecc) {
-				oob.ptr = oobreadbuf;
-			} else {
-				int i, start, len;
-				int tags_pos = 0;
-				/*
-				 *  We use autoplacement and have the oobinfo with the autoplacement
-				 * information from the kernel available
-				 *
-				 * Modified to support out of order oobfree segments,
-				 * such as the layout used by diskonchip.c
-				 */
-				if (!oobinfochanged && (old_oobinfo.useecc == MTD_NANDECC_AUTOPLACE)) {
-					for (i = 0;old_oobinfo.oobfree[i][1]; i++) {
-						/* Set the reserved bytes to 0xff */
-						start = old_oobinfo.oobfree[i][0];
-						len = old_oobinfo.oobfree[i][1];
-						if (rawoob)
-							memcpy(oobbuf + start,
-									oobreadbuf + start, len);
-						else
-							memcpy(oobbuf + start,
-									oobreadbuf + tags_pos, len);
-						tags_pos += len;
-					}
-				} else {
-					/* Set at least the ecc byte positions to 0xff */
-					start = old_oobinfo.eccbytes;
-					len = meminfo.oobsize - start;
+			for (i = 0; ecclayout.oobfree[i].length; i++) {
+				/* Set the reserved bytes to 0xff */
+				start = ecclayout.oobfree[i].offset;
+				len = ecclayout.oobfree[i].length;
+				if (rawoob)
 					memcpy(oobbuf + start,
-							oobreadbuf + start,
-							len);
-				}
+							oobreadbuf + start, len);
+				else
+					memcpy(oobbuf + start,
+							oobreadbuf + tags_pos, len);
+				tags_pos += len;
 			}
+
 			/* Write OOB data first, as ecc will be placed in there*/
 			oob.start = mtdoffset;
 			if (ioctl(fd, MEMWRITEOOB, &oob) != 0) {
@@ -686,13 +574,6 @@ closeall:
 	close(ifd);
 
 restoreoob:
-	if (oobinfochanged == 1) {
-		if (ioctl (fd, MEMSETOOBSEL, &old_oobinfo) != 0) {
-			perror ("MEMSETOOBSEL");
-			close (fd);
-			exit (EXIT_FAILURE);
-		}
-	}
 
 	close(fd);
 
-- 
1.5.4.3