mtd: parsers: ofpart: support Linksys Northstar partitions

This allows extending ofpart parser with support for Linksys Northstar
devices. That support uses recently added quirks mechanism.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20210312134919.7767-2-zajec5@gmail.com

1 files changed, 50 insertions, 0 deletions

diff --git a/drivers/mtd/parsers/ofpart_linksys_ns.c b/drivers/mtd/parsers/ofpart_linksys_ns.c
new file mode 100644
index 000000000000..318c42d0256b
--- /dev/null
+++ b/drivers/mtd/parsers/ofpart_linksys_ns.c
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>
+ */
+
+#include <linux/bcm47xx_nvram.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+
+#include "ofpart_linksys_ns.h"
+
+#define NVRAM_BOOT_PART		"bootpartition"
+
+static int ofpart_linksys_ns_bootpartition(void)
+{
+	char buf[4];
+	int bootpartition;
+
+	/* Check CFE environment variable */
+	if (bcm47xx_nvram_getenv(NVRAM_BOOT_PART, buf, sizeof(buf)) > 0) {
+		if (!kstrtoint(buf, 0, &bootpartition))
+			return bootpartition;
+		pr_warn("Failed to parse %s value \"%s\"\n", NVRAM_BOOT_PART,
+			buf);
+	} else {
+		pr_warn("Failed to get NVRAM \"%s\"\n", NVRAM_BOOT_PART);
+	}
+
+	return 0;
+}
+
+int linksys_ns_partitions_post_parse(struct mtd_info *mtd,
+				     struct mtd_partition *parts,
+				     int nr_parts)
+{
+	int bootpartition = ofpart_linksys_ns_bootpartition();
+	int trx_idx = 0;
+	int i;
+
+	for (i = 0; i < nr_parts; i++) {
+		if (of_device_is_compatible(parts[i].of_node, "linksys,ns-firmware")) {
+			if (trx_idx++ == bootpartition)
+				parts[i].name = "firmware";
+			else
+				parts[i].name = "backup";
+		}
+	}
+
+	return 0;
+}