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bcm4908: add pending mtd patches for BCM4908 partitioning

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BCM4908 can have multiple firmware partitions. MTD needs to detect which
one is currently used.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
This commit is contained in:
Rafał Miłecki 2021-01-20 07:39:25 +01:00
parent 7495acb555
commit 20a0d435d8
3 changed files with 393 additions and 0 deletions
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113
target/linux/bcm4908/patches-5.4/140-0001-dt-bindings-mtd-move-partition-binding-to-its-own-fi.patch Normal file
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@ -0,0 +1,113 @@
From 4fdbaa5a3dbe761b231c13feaa53242aae3306cc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Fri, 15 Jan 2021 15:23:02 +0100
Subject: [PATCH 1/3] dt-bindings: mtd: move partition binding to its own file
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Single partition binding is quite common and may be:
1. Used by multiple parsers
2. Extended for more specific cases
Move it to separated file to avoid code duplication.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
.../mtd/partitions/fixed-partitions.yaml | 33 +------------
.../bindings/mtd/partitions/partition.yaml | 47 +++++++++++++++++++
2 files changed, 48 insertions(+), 32 deletions(-)
create mode 100644 Documentation/devicetree/bindings/mtd/partitions/partition.yaml
--- a/Documentation/devicetree/bindings/mtd/partitions/fixed-partitions.yaml
+++ b/Documentation/devicetree/bindings/mtd/partitions/fixed-partitions.yaml
@@ -27,38 +27,7 @@ properties:
patternProperties:
"@[0-9a-f]+$":
- description: node describing a single flash partition
- type: object
-
- properties:
- reg:
- description: partition's offset and size within the flash
- maxItems: 1
-
- label:
- description: The label / name for this partition. If omitted, the label
- is taken from the node name (excluding the unit address).
-
- read-only:
- description: This parameter, if present, is a hint that this partition
- should only be mounted read-only. This is usually used for flash
- partitions containing early-boot firmware images or data which should
- not be clobbered.
- type: boolean
-
- lock:
- description: Do not unlock the partition at initialization time (not
- supported on all devices)
- type: boolean
-
- slc-mode:
- description: This parameter, if present, allows one to emulate SLC mode
- on a partition attached to an MLC NAND thus making this partition
- immune to paired-pages corruptions
- type: boolean
-
- required:
- - reg
+ $ref: "partition.yaml#"
required:
- "#address-cells"
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/partitions/partition.yaml
@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mtd/partitions/partition.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Partition
+
+description: |
+ This binding describes a single flash partition. Each partition must have its
+ relative offset and size specified. Depending on partition function extra
+ properties can be used.
+
+maintainers:
+ - Rafał Miłecki <rafal@milecki.pl>
+
+properties:
+ reg:
+ description: partition's offset and size within the flash
+ maxItems: 1
+
+ label:
+ description: The label / name for this partition. If omitted, the label
+ is taken from the node name (excluding the unit address).
+
+ read-only:
+ description: This parameter, if present, is a hint that this partition
+ should only be mounted read-only. This is usually used for flash
+ partitions containing early-boot firmware images or data which should
+ not be clobbered.
+ type: boolean
+
+ lock:
+ description: Do not unlock the partition at initialization time (not
+ supported on all devices)
+ type: boolean
+
+ slc-mode:
+ description: This parameter, if present, allows one to emulate SLC mode
+ on a partition attached to an MLC NAND thus making this partition
+ immune to paired-pages corruptions
+ type: boolean
+
+required:
+ - reg
+
+additionalProperties: true

89
target/linux/bcm4908/patches-5.4/140-0002-dt-bindings-mtd-add-binding-from-BCM4908-partitions.patch Normal file
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From 4f740351484e88bcea3776578288b6ec400829c8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Fri, 15 Jan 2021 16:01:04 +0100
Subject: [PATCH 2/3] dt-bindings: mtd: add binding from BCM4908 partitions
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
BCM4908 uses fixed partitions layout but function of some partitions may
vary. Some devices use multiple firmware partitions and those should be
marked to let system discover their purpose.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
.../partitions/brcm,bcm4908-partitions.yaml | 68 +++++++++++++++++++
1 file changed, 68 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mtd/partitions/brcm,bcm4908-partitions.yaml
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/partitions/brcm,bcm4908-partitions.yaml
@@ -0,0 +1,68 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mtd/partitions/brcm,bcm4908-partitions.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Broadcom BCM4908 partitioning
+
+description: |
+ Broadcom BCM4908 CFE bootloader supports two firmware partitions. One is used
+ for regular booting, the other is treated as fallback.
+
+ This binding allows defining all fixed partitions and marking those containing
+ firmware. System can use that information e.g. for booting or flashing
+ purposes.
+
+maintainers:
+ - Rafał Miłecki <rafal@milecki.pl>
+
+properties:
+ compatible:
+ const: brcm,bcm4908-partitions
+
+ "#address-cells": true
+
+ "#size-cells": true
+
+patternProperties:
+ "@[0-9a-f]+$":
+ allOf:
+ - $ref: "partition.yaml#"
+ - properties:
+ compatible:
+ const: brcm,bcm4908-firmware
+
+required:
+ - "#address-cells"
+ - "#size-cells"
+
+additionalProperties: false
+
+examples:
+ - |
+ partitions {
+ compatible = "brcm,bcm4908-partitions";
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ partition@0 {
+ label = "cferom";
+ reg = <0x0 0x100000>;
+ };
+
+ partition@100000 {
+ compatible = "brcm,bcm4908-firmware";
+ reg = <0x100000 0xf00000>;
+ };
+
+ partition@1000000 {
+ compatible = "brcm,bcm4908-firmware";
+ reg = <0x1000000 0xf00000>;
+ };
+
+ partition@1f00000 {
+ label = "calibration";
+ reg = <0x1f00000 0x100000>;
+ };
+ };

191
target/linux/bcm4908/patches-5.4/140-0003-mtd-parsers-ofpart-support-BCM4908-fixed-partitions.patch Normal file
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@ -0,0 +1,191 @@
From db18357719613cc40234300b10e28e4dfa075375 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Fri, 15 Jan 2021 16:23:01 +0100
Subject: [PATCH 3/3] mtd: parsers: ofpart: support BCM4908 fixed partitions
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
BCM4908 partitioning is based on fixed layout but allows specifying
multiple firmware partitions. It requires detecting which firmware
partition was used for booting current kernel.
To support such cases without duplicating a lot of code (without copying
most of the ofpart.c code) support for post-parsing callback was added.
BCM4908 callback simply reads offset of currently used firmware
partition from the DT. Bootloader specifies it using the "brcm_blparms"
property.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
drivers/mtd/parsers/Makefile | 1 +
drivers/mtd/parsers/bcm4908-partitions.c | 62 ++++++++++++++++++++++++
drivers/mtd/parsers/bcm4908-partitions.h | 7 +++
drivers/mtd/parsers/ofpart.c | 28 ++++++++++-
4 files changed, 96 insertions(+), 2 deletions(-)
create mode 100644 drivers/mtd/parsers/bcm4908-partitions.c
create mode 100644 drivers/mtd/parsers/bcm4908-partitions.h
--- a/drivers/mtd/parsers/Makefile
+++ b/drivers/mtd/parsers/Makefile
@@ -5,6 +5,7 @@ obj-$(CONFIG_MTD_BCM63XX_PARTS) += bcm6
obj-$(CONFIG_MTD_CMDLINE_PARTS) += cmdlinepart.o
obj-$(CONFIG_MTD_MYLOADER_PARTS) += myloader.o
obj-$(CONFIG_MTD_OF_PARTS) += ofpart.o
+obj-$(CONFIG_MTD_OF_PARTS) += bcm4908-partitions.o
obj-$(CONFIG_MTD_PARSER_IMAGETAG) += parser_imagetag.o
obj-$(CONFIG_MTD_AFS_PARTS) += afs.o
obj-$(CONFIG_MTD_PARSER_TRX) += parser_trx.o
--- /dev/null
+++ b/drivers/mtd/parsers/bcm4908-partitions.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/of.h>
+#include <linux/mtd/mtd.h>
+#include <linux/slab.h>
+#include <linux/mtd/partitions.h>
+
+#define BLPARAMS_FW_OFFSET "NAND_RFS_OFS"
+
+static long long bcm4908_partitions_fw_offset(void)
+{
+ struct device_node *root;
+ struct property *prop;
+ const char *s;
+
+ root = of_find_node_by_path("/");
+ if (!root)
+ return -ENOENT;
+
+ of_property_for_each_string(root, "brcm_blparms", prop, s) {
+ size_t len = strlen(BLPARAMS_FW_OFFSET);
+ unsigned long offset;
+ int err;
+
+ if (strncmp(s, BLPARAMS_FW_OFFSET, len) || s[len] != '=')
+ continue;
+
+ err = kstrtoul(s + len + 1, 0, &offset);
+ if (err) {
+ pr_err("failed to parse %s\n", s + len + 1);
+ return err;
+ }
+
+ return offset << 10;
+ }
+
+ return -ENOENT;
+}
+
+int bcm4908_partitions_post_parse(struct mtd_info *mtd, struct mtd_partition *parts, int nr_parts)
+{
+ long long fw_offset;
+ int i;
+
+ fw_offset = bcm4908_partitions_fw_offset();
+
+ for (i = 0; i < nr_parts; i++) {
+ if (of_device_is_compatible(parts[i].of_node, "brcm,bcm4908-firmware")) {
+ if (fw_offset < 0 || parts[i].offset == fw_offset)
+ parts[i].name = "firmware";
+ else
+ parts[i].name = "backup";
+ }
+ }
+
+ return 0;
+}
--- /dev/null
+++ b/drivers/mtd/parsers/bcm4908-partitions.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __BCM4908_PARTITIONS_H
+#define __BCM4908_PARTITIONS_H
+
+int bcm4908_partitions_post_parse(struct mtd_info *mtd, struct mtd_partition *parts, int nr_parts);
+
+#endif
--- a/drivers/mtd/parsers/ofpart.c
+++ b/drivers/mtd/parsers/ofpart.c
@@ -16,6 +16,18 @@
#include <linux/slab.h>
#include <linux/mtd/partitions.h>
+#include "bcm4908-partitions.h"
+
+struct fixed_partitions_quirks {
+ int (*post_parse)(struct mtd_info *mtd, struct mtd_partition *parts, int nr_parts);
+};
+
+struct fixed_partitions_quirks bcm4908_partitions_quirks = {
+ .post_parse = bcm4908_partitions_post_parse,
+};
+
+static const struct of_device_id parse_ofpart_match_table[];
+
static bool node_has_compatible(struct device_node *pp)
{
return of_get_property(pp, "compatible", NULL);
@@ -25,6 +37,8 @@ static int parse_fixed_partitions(struct
const struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
{
+ const struct fixed_partitions_quirks *quirks;
+ const struct of_device_id *of_id;
struct mtd_partition *parts;
struct device_node *mtd_node;
struct device_node *ofpart_node;
@@ -33,7 +47,6 @@ static int parse_fixed_partitions(struct
int nr_parts, i, ret = 0;
bool dedicated = true;
-
/* Pull of_node from the master device node */
mtd_node = mtd_get_of_node(master);
if (!mtd_node)
@@ -50,11 +63,16 @@ static int parse_fixed_partitions(struct
master->name, mtd_node);
ofpart_node = mtd_node;
dedicated = false;
- } else if (!of_device_is_compatible(ofpart_node, "fixed-partitions")) {
+ }
+
+ of_id = of_match_node(parse_ofpart_match_table, ofpart_node);
+ if (dedicated && !of_id) {
/* The 'partitions' subnode might be used by another parser */
return 0;
}
+ quirks = of_id ? of_id->data : NULL;
+
/* First count the subnodes */
nr_parts = 0;
for_each_child_of_node(ofpart_node, pp) {
@@ -123,6 +141,9 @@ static int parse_fixed_partitions(struct
if (!nr_parts)
goto ofpart_none;
+ if (quirks && quirks->post_parse)
+ quirks->post_parse(master, parts, nr_parts);
+
*pparts = parts;
return nr_parts;
@@ -137,7 +158,10 @@ ofpart_none:
}
static const struct of_device_id parse_ofpart_match_table[] = {
+ /* Generic */
{ .compatible = "fixed-partitions" },
+ /* Customized */
+ { .compatible = "brcm,bcm4908-partitions", .data = &bcm4908_partitions_quirks, },
{},
};
MODULE_DEVICE_TABLE(of, parse_ofpart_match_table);