@@ -72,6 +72,16 @@ config MTD_OF_PARTS
flash memory node, as described in
Documentation/devicetree/bindings/mtd/mtd.yaml.
+config MTD_OF_PARTS_AIROHA
+ bool "Airoha EN7815 partitioning support"
+ depends on MTD_OF_PARTS && (ARCH_AIROHA || COMPILE_TEST)
+ default ARCH_AIROHA
+ help
+ This provides partitions parser for Airoha EN7815 family devices
+ that can have dynamic "ART" partition at the end of the flash.
+ It takes care of finding the correct offset and update property
+ with it.
+
config MTD_OF_PARTS_BCM4908
bool "BCM4908 partitioning support"
depends on MTD_OF_PARTS && (ARCH_BCMBCA || COMPILE_TEST)
@@ -5,6 +5,7 @@ obj-$(CONFIG_MTD_BRCM_U_BOOT) += brcm_u-boot.o
obj-$(CONFIG_MTD_CMDLINE_PARTS) += cmdlinepart.o
obj-$(CONFIG_MTD_OF_PARTS) += ofpart.o
ofpart-y += ofpart_core.o
+ofpart-$(CONFIG_MTD_OF_PARTS_AIROHA) += ofpart_airoha.o
ofpart-$(CONFIG_MTD_OF_PARTS_BCM4908) += ofpart_bcm4908.o
ofpart-$(CONFIG_MTD_OF_PARTS_LINKSYS_NS)+= ofpart_linksys_ns.o
obj-$(CONFIG_MTD_PARSER_IMAGETAG) += parser_imagetag.o
new file mode 100644
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2024 Christian Marangi <ansuelsmth@gmail.com>
+ */
+
+#include <linux/mtd/mtd.h>
+#include <linux/slab.h>
+#include <linux/mtd/partitions.h>
+
+#include "ofpart_airoha.h"
+
+int airoha_partitions_post_parse(struct mtd_info *mtd,
+ struct mtd_partition *parts,
+ int nr_parts)
+{
+ struct mtd_partition *part;
+ int len, a_cells, s_cells;
+ struct device_node *pp;
+ struct property *prop;
+ const __be32 *reg;
+ __be32 *new_reg;
+
+ part = &parts[nr_parts - 1];
+ pp = part->of_node;
+
+ /* Skip if ART partition have a valid offset instead of a dynamic one */
+ if (!of_device_is_compatible(pp, "airoha,dynamic-art"))
+ return 0;
+
+ /* ART partition is set at the end of flash - size */
+ part->offset = mtd->size - part->size;
+
+ /* Update the offset with the new calculate value in DT */
+ prop = kzalloc(sizeof(*prop), GFP_KERNEL);
+ if (!prop)
+ return -ENOMEM;
+
+ /* Reg already validated by fixed-partition parser */
+ reg = of_get_property(pp, "reg", &len);
+
+ /* Fixed partition */
+ a_cells = of_n_addr_cells(pp);
+ s_cells = of_n_size_cells(pp);
+
+ prop->name = "reg";
+ prop->length = (a_cells + s_cells) * sizeof(__be32);
+ prop->value = kmemdup(reg, (a_cells + s_cells) * sizeof(__be32),
+ GFP_KERNEL);
+ new_reg = prop->value;
+ memset(new_reg, 0, a_cells * sizeof(__be32));
+ new_reg[a_cells - 1] = cpu_to_be32(part->offset);
+ if (a_cells > 1)
+ new_reg[0] = cpu_to_be32(part->offset >> 32);
+ of_update_property(pp, prop);
+
+ return 0;
+}
new file mode 100644
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __OFPART_AIROHA_H
+#define __OFPART_AIROHA_H
+
+#ifdef CONFIG_MTD_OF_PARTS_AIROHA
+int airoha_partitions_post_parse(struct mtd_info *mtd,
+ struct mtd_partition *parts,
+ int nr_parts);
+#else
+static inline int airoha_partitions_post_parse(struct mtd_info *mtd,
+ struct mtd_partition *parts,
+ int nr_parts)
+{
+ return -EOPNOTSUPP;
+}
+#endif
+
+#endif
@@ -16,6 +16,7 @@
#include <linux/slab.h>
#include <linux/mtd/partitions.h>
+#include "ofpart_airoha.h"
#include "ofpart_bcm4908.h"
#include "ofpart_linksys_ns.h"
@@ -23,6 +24,10 @@ struct fixed_partitions_quirks {
int (*post_parse)(struct mtd_info *mtd, struct mtd_partition *parts, int nr_parts);
};
+static struct fixed_partitions_quirks airoha_partitions_quirks = {
+ .post_parse = airoha_partitions_post_parse,
+};
+
static struct fixed_partitions_quirks bcm4908_partitions_quirks = {
.post_parse = bcm4908_partitions_post_parse,
};
@@ -192,6 +197,7 @@ static const struct of_device_id parse_ofpart_match_table[] = {
/* Generic */
{ .compatible = "fixed-partitions" },
/* Customized */
+ { .compatible = "airoha,fixed-partitions", .data = &airoha_partitions_quirks, },
{ .compatible = "brcm,bcm4908-partitions", .data = &bcm4908_partitions_quirks, },
{ .compatible = "linksys,ns-partitions", .data = &linksys_ns_partitions_quirks, },
{},
Add support for Airoha parser based on a post parse ofpart function. Airoha partition table follow normal fixed-partition implementation with a special implementation for the ART partition. This is always the last partition and is placed from the end of the flash - the partition size. To enable this special implementation for ART partition, the relevant node require the "airoha,dynamic-art" compatible. With that declared, offset value is ignored and real offset is updated with the calculated value. Due to usage of specific bad block management driver, the MTD size might vary hence the ART partition offset needs to be dynamically parsed and can't be declared statically. Signed-off-by: Christian Marangi <ansuelsmth@gmail.com> --- drivers/mtd/parsers/Kconfig | 10 +++++ drivers/mtd/parsers/Makefile | 1 + drivers/mtd/parsers/ofpart_airoha.c | 57 +++++++++++++++++++++++++++++ drivers/mtd/parsers/ofpart_airoha.h | 18 +++++++++ drivers/mtd/parsers/ofpart_core.c | 6 +++ 5 files changed, 92 insertions(+) create mode 100644 drivers/mtd/parsers/ofpart_airoha.c create mode 100644 drivers/mtd/parsers/ofpart_airoha.h