1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/mtd/chips/cfi_probe.c b/drivers/mtd/chips/cfi_probe.c
index e8d0164498b0..cf426956454c 100644
--- a/drivers/mtd/chips/cfi_probe.c
+++ b/drivers/mtd/chips/cfi_probe.c
@@ -63,6 +63,30 @@ do { \
 
 #endif
 
+/*
+ * This fixup occurs immediately after reading the CFI structure and can affect
+ * the number of chips detected, unlike cfi_fixup, which occurs after an
+ * mtd_info structure has been created for the chip.
+ */
+struct cfi_early_fixup {
+	uint16_t mfr;
+	uint16_t id;
+	void (*fixup)(struct cfi_private *cfi);
+};
+
+static void cfi_early_fixup(struct cfi_private *cfi,
+			    const struct cfi_early_fixup *fixups)
+{
+	const struct cfi_early_fixup *f;
+
+	for (f = fixups; f->fixup; f++) {
+		if (((f->mfr == CFI_MFR_ANY) || (f->mfr == cfi->mfr)) &&
+		    ((f->id == CFI_ID_ANY) || (f->id == cfi->id))) {
+			f->fixup(cfi);
+		}
+	}
+}
+
 /* check for QRY.
    in: interleave,type,mode
    ret: table index, <0 for error
@@ -151,6 +175,22 @@ static int __xipram cfi_probe_chip(struct map_info *map, __u32 base,
 	return 1;
 }
 
+static void fixup_s70gl02gs_chips(struct cfi_private *cfi)
+{
+	/*
+	 * S70GL02GS flash reports a single 256 MiB chip, but is really made up
+	 * of two 128 MiB chips with 1024 sectors each.
+	 */
+	cfi->cfiq->DevSize = 27;
+	cfi->cfiq->EraseRegionInfo[0] = 0x20003ff;
+	pr_warn("Bad S70GL02GS CFI data; adjust to detect 2 chips\n");
+}
+
+static const struct cfi_early_fixup cfi_early_fixup_table[] = {
+	{ CFI_MFR_AMD, 0x4801, fixup_s70gl02gs_chips },
+	{ },
+};
+
 static int __xipram cfi_chip_setup(struct map_info *map,
 				   struct cfi_private *cfi)
 {
@@ -235,6 +275,8 @@ static int __xipram cfi_chip_setup(struct map_info *map,
 	cfi_qry_mode_off(base, map, cfi);
 	xip_allowed(base, map);
 
+	cfi_early_fixup(cfi, cfi_early_fixup_table);
+
 	printk(KERN_INFO "%s: Found %d x%d devices at 0x%x in %d-bit bank. Manufacturer ID %#08x Chip ID %#08x\n",
 	       map->name, cfi->interleave, cfi->device_type*8, base,
 	       map->bankwidth*8, cfi->mfr, cfi->id);