mediatek: add a new spi-nand driver for kernel 5.10

This patch adds a new spi-nand driver which implements the SNFI of mt7622
and mt7629.

Unlike the existing snfi driver which makes use of the spi-mem framework
and the spi-nand framework with modified ecc support, this driver is
implemented directly on the mtd framework with other components untouched,
and provides better performance, and behaves exactly the same as the nand
framework.

Signed-off-by: Weijie Gao <hackpascal@gmail.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/target/linux/mediatek/files-5.10/drivers/mtd/mtk-snand/mtk-snand-os.c b/target/linux/mediatek/files-5.10/drivers/mtd/mtk-snand/mtk-snand-os.c
new file mode 100644
index 0000000000..0c3ffec8b4
--- /dev/null
+++ b/target/linux/mediatek/files-5.10/drivers/mtd/mtk-snand/mtk-snand-os.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 MediaTek Inc. All Rights Reserved.
+ *
+ * Author: Weijie Gao <weijie.gao@mediatek.com>
+ */
+
+#include "mtk-snand-def.h"
+
+int mtk_snand_log(struct mtk_snand_plat_dev *pdev,
+		  enum mtk_snand_log_category cat, const char *fmt, ...)
+{
+	const char *catname = "";
+	va_list ap;
+	char *msg;
+
+	switch (cat) {
+	case SNAND_LOG_NFI:
+		catname = "NFI";
+		break;
+	case SNAND_LOG_SNFI:
+		catname = "SNFI";
+		break;
+	case SNAND_LOG_ECC:
+		catname = "ECC";
+		break;
+	default:
+		break;
+	}
+
+	va_start(ap, fmt);
+	msg = kvasprintf(GFP_KERNEL, fmt, ap);
+	va_end(ap);
+
+	if (!msg) {
+		dev_warn(pdev->dev, "unable to print log\n");
+		return -1;
+	}
+
+	if (*catname)
+		dev_warn(pdev->dev, "%s: %s", catname, msg);
+	else
+		dev_warn(pdev->dev, "%s", msg);
+
+	kfree(msg);
+
+	return 0;
+}