mtd: cfi: Add early fixup for S70GL02GS

S70GL02GS flash reports a single 256 MiB chip, but is really made up
of two 128 MiB chips with 1024 sectors each.

Without early fixups (top half of device cannot be written or erased):
ff0000000.nor-boot: Found 1 x16 devices at 0x0 in 16-bit bank. <snip>
Amd/Fujitsu Extended Query Table at 0x0040
Amd/Fujitsu Extended Query version 1.5.
number of CFI chips: 1

With early fixups (entire device can be written and erased):
Bad S70GL02GS CFI data; adjust to detect 2 chips
ff0000000.nor-boot: Found 1 x16 devices at 0x0 in 16-bit bank. <snip>
ff0000000.nor-boot: Found 1 x16 devices at 0x8000000 in 16-bit bank
Amd/Fujitsu Extended Query Table at 0x0040
Amd/Fujitsu Extended Query version 1.5.
number of CFI chips: 2

Signed-off-by: Aaron Sierra <[e-mail]>
Signed-off-by: Boris Brezillon <[e-mail]>

drivers/mtd/chips/cfi_probe.c

···
 	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 },
 	{ },
 };