Merge git://git.infradead.org/mtd-2.6

* git://git.infradead.org/mtd-2.6: (69 commits)
  Revert "[MTD] m25p80.c code cleanup"
  [MTD] [NAND] GPIO driver depends on ARM... for now.
  [MTD] [NAND] sh_flctl: fix compile error
  [MTD] [NOR] AT49BV6416 has swapped erase regions
  [MTD] [NAND] GPIO NAND flash driver
  [MTD] cmdlineparts documentation change - explain where mtd-id comes from
  [MTD] cfi_cmdset_0002.c: Add Macronix CFI V1.0 TopBottom detection
  [MTD] [NAND] Fix compilation warnings in drivers/mtd/nand/cs553x_nand.c
  [JFFS2] Write buffer offset adjustment for NOR-ECC (Sibley) flash
  [MTD] mtdoops: Fix a bug where block may not be erased
  [MTD] mtdoops: Add a magic number to logged kernel oops
  [MTD] mtdoops: Fix an off by one error
  [JFFS2] Correct parameter names of jffs2_compress() in comments
  [MTD] [NAND] sh_flctl: add support for Renesas SuperH FLCTL
  [MTD] [NAND] Bug on atmel_nand HW ECC : OOB info not correctly written
  [MTD] [MAPS] Remove unused variable after ROM API cleanup.
  [MTD] m25p80.c extended jedec support (v2)
  [MTD] remove unused mtd parameter in of_mtd_parse_partitions()
  [MTD] [NAND] remove dead Kconfig associated with !CONFIG_PPC_MERGE
  [MTD] [NAND] driver extension to support NAND on TQM85xx modules
  ...

1 files changed, 62 insertions, 4 deletions

diff --git a/drivers/mtd/chips/cfi_util.c b/drivers/mtd/chips/cfi_util.c
index 0ee45701801..34d40e25d31 100644
--- a/drivers/mtd/chips/cfi_util.c
+++ b/drivers/mtd/chips/cfi_util.c
@@ -24,6 +24,66 @@
 #include <linux/mtd/cfi.h>
 #include <linux/mtd/compatmac.h>
 
+int __xipram cfi_qry_present(struct map_info *map, __u32 base,
+			     struct cfi_private *cfi)
+{
+	int osf = cfi->interleave * cfi->device_type;	/* scale factor */
+	map_word val[3];
+	map_word qry[3];
+
+	qry[0] = cfi_build_cmd('Q', map, cfi);
+	qry[1] = cfi_build_cmd('R', map, cfi);
+	qry[2] = cfi_build_cmd('Y', map, cfi);
+
+	val[0] = map_read(map, base + osf*0x10);
+	val[1] = map_read(map, base + osf*0x11);
+	val[2] = map_read(map, base + osf*0x12);
+
+	if (!map_word_equal(map, qry[0], val[0]))
+		return 0;
+
+	if (!map_word_equal(map, qry[1], val[1]))
+		return 0;
+
+	if (!map_word_equal(map, qry[2], val[2]))
+		return 0;
+
+	return 1; 	/* "QRY" found */
+}
+EXPORT_SYMBOL_GPL(cfi_qry_present);
+
+int __xipram cfi_qry_mode_on(uint32_t base, struct map_info *map,
+			     struct cfi_private *cfi)
+{
+	cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
+	cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
+	if (cfi_qry_present(map, base, cfi))
+		return 1;
+	/* QRY not found probably we deal with some odd CFI chips */
+	/* Some revisions of some old Intel chips? */
+	cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
+	cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
+	cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
+	if (cfi_qry_present(map, base, cfi))
+		return 1;
+	/* ST M29DW chips */
+	cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
+	cfi_send_gen_cmd(0x98, 0x555, base, map, cfi, cfi->device_type, NULL);
+	if (cfi_qry_present(map, base, cfi))
+		return 1;
+	/* QRY not found */
+	return 0;
+}
+EXPORT_SYMBOL_GPL(cfi_qry_mode_on);
+
+void __xipram cfi_qry_mode_off(uint32_t base, struct map_info *map,
+			       struct cfi_private *cfi)
+{
+	cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
+	cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
+}
+EXPORT_SYMBOL_GPL(cfi_qry_mode_off);
+
 struct cfi_extquery *
 __xipram cfi_read_pri(struct map_info *map, __u16 adr, __u16 size, const char* name)
 {
@@ -48,8 +108,7 @@ __xipram cfi_read_pri(struct map_info *map, __u16 adr, __u16 size, const char* n
 #endif
 
 	/* Switch it into Query Mode */
-	cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
-
+	cfi_qry_mode_on(base, map, cfi);
 	/* Read in the Extended Query Table */
 	for (i=0; i<size; i++) {
 		((unsigned char *)extp)[i] =
@@ -57,8 +116,7 @@ __xipram cfi_read_pri(struct map_info *map, __u16 adr, __u16 size, const char* n
 	}
 
 	/* Make sure it returns to read mode */
-	cfi_send_gen_cmd(0xf0, 0, base, map, cfi, cfi->device_type, NULL);
-	cfi_send_gen_cmd(0xff, 0, base, map, cfi, cfi->device_type, NULL);
+	cfi_qry_mode_off(base, map, cfi);
 
 #ifdef CONFIG_MTD_XIP
 	(void) map_read(map, base);