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Diffstat (limited to 'drivers/mtd/nand/raw/nand_esmt.c')
-rw-r--r--drivers/mtd/nand/raw/nand_esmt.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/drivers/mtd/nand/raw/nand_esmt.c b/drivers/mtd/nand/raw/nand_esmt.c
new file mode 100644
index 000000000..4412c407a
--- /dev/null
+++ b/drivers/mtd/nand/raw/nand_esmt.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Toradex AG
+ *
+ * Author: Marcel Ziswiler <marcel.ziswiler@toradex.com>
+ */
+
+#include <linux/mtd/rawnand.h>
+#include "internals.h"
+
+static void esmt_nand_decode_id(struct nand_chip *chip)
+{
+ struct nand_device *base = &chip->base;
+ struct nand_ecc_props requirements = {};
+
+ nand_decode_ext_id(chip);
+
+ /* Extract ECC requirements from 5th id byte. */
+ if (chip->id.len >= 5 && nand_is_slc(chip)) {
+ requirements.step_size = 512;
+ switch (chip->id.data[4] & 0x3) {
+ case 0x0:
+ requirements.strength = 4;
+ break;
+ case 0x1:
+ requirements.strength = 2;
+ break;
+ case 0x2:
+ requirements.strength = 1;
+ break;
+ default:
+ WARN(1, "Could not get ECC info");
+ requirements.step_size = 0;
+ break;
+ }
+ }
+
+ nanddev_set_ecc_requirements(base, &requirements);
+}
+
+static int esmt_nand_init(struct nand_chip *chip)
+{
+ if (nand_is_slc(chip))
+ /*
+ * It is known that some ESMT SLC NANDs have been shipped
+ * with the factory bad block markers in the first or last page
+ * of the block, instead of the first or second page. To be on
+ * the safe side, let's check all three locations.
+ */
+ chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE |
+ NAND_BBM_LASTPAGE;
+
+ return 0;
+}
+
+const struct nand_manufacturer_ops esmt_nand_manuf_ops = {
+ .detect = esmt_nand_decode_id,
+ .init = esmt_nand_init,
+};