diff options
3 files changed, 372 insertions, 0 deletions
diff --git a/target/linux/generic/pending-4.14/495-mtd-core-add-get_mtd_device_by_node.patch b/target/linux/generic/pending-4.14/495-mtd-core-add-get_mtd_device_by_node.patch new file mode 100644 index 0000000..32a87d3 --- /dev/null +++ b/target/linux/generic/pending-4.14/495-mtd-core-add-get_mtd_device_by_node.patch @@ -0,0 +1,82 @@ +From 1bd1b740f208d1cf4071932cc51860d37266c402 Mon Sep 17 00:00:00 2001 +From: Bernhard Frauendienst <kernel@nospam.obeliks.de> +Date: Sat, 1 Sep 2018 00:30:11 +0200 +Subject: [PATCH 495/497] mtd: core: add get_mtd_device_by_node + +Add function to retrieve a mtd device by its OF node. Since drivers can +assign arbitrary names to mtd devices in the absence of a label +property, there is no other reliable way to retrieve a mtd device for a +given OF node. + +Signed-off-by: Bernhard Frauendienst <kernel@nospam.obeliks.de> +Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com> +--- + drivers/mtd/mtdcore.c | 38 ++++++++++++++++++++++++++++++++++++++ + include/linux/mtd/mtd.h | 2 ++ + 2 files changed, 40 insertions(+) + +diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c +index e7ea842ba3db..1134bb81d2e5 100644 +--- a/drivers/mtd/mtdcore.c ++++ b/drivers/mtd/mtdcore.c +@@ -936,6 +936,44 @@ struct mtd_info *get_mtd_device_nm(const char *name) + } + EXPORT_SYMBOL_GPL(get_mtd_device_nm); + ++/** ++ * get_mtd_device_by_node - obtain a validated handle for an MTD device ++ * by of_node ++ * @of_node: OF node of MTD device to open ++ * ++ * This function returns MTD device description structure in case of ++ * success and an error code in case of failure. ++ */ ++struct mtd_info *get_mtd_device_by_node(const struct device_node *of_node) ++{ ++ int err = -ENODEV; ++ struct mtd_info *mtd = NULL, *other; ++ ++ mutex_lock(&mtd_table_mutex); ++ ++ mtd_for_each_device(other) { ++ if (of_node == other->dev.of_node) { ++ mtd = other; ++ break; ++ } ++ } ++ ++ if (!mtd) ++ goto out_unlock; ++ ++ err = __get_mtd_device(mtd); ++ if (err) ++ goto out_unlock; ++ ++ mutex_unlock(&mtd_table_mutex); ++ return mtd; ++ ++out_unlock: ++ mutex_unlock(&mtd_table_mutex); ++ return ERR_PTR(err); ++} ++EXPORT_SYMBOL_GPL(get_mtd_device_by_node); ++ + void put_mtd_device(struct mtd_info *mtd) + { + mutex_lock(&mtd_table_mutex); +diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h +index 6cd0f6b7658b..cf7c8030cd8e 100644 +--- a/include/linux/mtd/mtd.h ++++ b/include/linux/mtd/mtd.h +@@ -557,6 +557,8 @@ extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num); + extern int __get_mtd_device(struct mtd_info *mtd); + extern void __put_mtd_device(struct mtd_info *mtd); + extern struct mtd_info *get_mtd_device_nm(const char *name); ++extern struct mtd_info *get_mtd_device_by_node( ++ const struct device_node *of_node); + extern void put_mtd_device(struct mtd_info *mtd); + + +-- +2.18.0 + diff --git a/target/linux/generic/pending-4.14/496-dt-bindings-add-bindings-for-mtd-concat-devices.patch b/target/linux/generic/pending-4.14/496-dt-bindings-add-bindings-for-mtd-concat-devices.patch new file mode 100644 index 0000000..99fdb0d --- /dev/null +++ b/target/linux/generic/pending-4.14/496-dt-bindings-add-bindings-for-mtd-concat-devices.patch @@ -0,0 +1,58 @@ +From 5734c6669fba7ddb5ef491ccff7159d15dba0b59 Mon Sep 17 00:00:00 2001 +From: Bernhard Frauendienst <kernel@nospam.obeliks.de> +Date: Wed, 5 Sep 2018 01:32:51 +0200 +Subject: [PATCH 496/497] dt-bindings: add bindings for mtd-concat devices + +Document virtual mtd-concat device bindings. + +Signed-off-by: Bernhard Frauendienst <kernel@nospam.obeliks.de> +--- + .../devicetree/bindings/mtd/mtd-concat.txt | 36 +++++++++++++++++++ + 1 file changed, 36 insertions(+) + create mode 100644 Documentation/devicetree/bindings/mtd/mtd-concat.txt + +diff --git a/Documentation/devicetree/bindings/mtd/mtd-concat.txt b/Documentation/devicetree/bindings/mtd/mtd-concat.txt +new file mode 100644 +index 000000000000..2daf3157b163 +--- /dev/null ++++ b/Documentation/devicetree/bindings/mtd/mtd-concat.txt +@@ -0,0 +1,36 @@ ++Virtual MTD concat device ++ ++Requires properties: ++- devices: list of phandles to mtd nodes that should be concatenated ++ ++Example: ++ ++&spi { ++ flash0: flash@0 { ++ ... ++ }; ++ flash1: flash@1 { ++ ... ++ }; ++}; ++ ++flash { ++ compatible = "mtd-concat"; ++ ++ devices = <&flash0 &flash1>; ++ ++ partitions { ++ compatible = "fixed-partitions"; ++ ++ partition@0 { ++ label = "boot"; ++ reg = <0x0000000 0x0040000>; ++ read-only; ++ }; ++ ++ partition@40000 { ++ label = "firmware"; ++ reg = <0x0040000 0x1fc0000>; ++ }; ++ } ++} +-- +2.18.0 + diff --git a/target/linux/generic/pending-4.14/497-mtd-mtdconcat-add-dt-driver-for-concat-devices.patch b/target/linux/generic/pending-4.14/497-mtd-mtdconcat-add-dt-driver-for-concat-devices.patch new file mode 100644 index 0000000..0c5ac5b --- /dev/null +++ b/target/linux/generic/pending-4.14/497-mtd-mtdconcat-add-dt-driver-for-concat-devices.patch @@ -0,0 +1,232 @@ +From e53f712d8eac71f54399b61038ccf87d2cee99d7 Mon Sep 17 00:00:00 2001 +From: Bernhard Frauendienst <kernel@nospam.obeliks.de> +Date: Sat, 25 Aug 2018 12:35:22 +0200 +Subject: [PATCH 497/497] mtd: mtdconcat: add dt driver for concat devices + +Some mtd drivers like physmap variants have support for concatenating +multiple mtd devices, but there is no generic way to define such a +concat device from within the device tree. + +This is useful for some SoC boards that use multiple flash chips as +memory banks of a single mtd device, with partitions spanning chip +borders. + +This commit adds a driver for creating virtual mtd-concat devices. They +must have a compatible = "mtd-concat" line, and define a list of devices +to concat in the 'devices' property, for example: + +flash { + compatible = "mtd-concat"; + + devices = <&flash0 &flash1>; + + partitions { + ... + }; +}; + +The driver is added to the very end of the mtd Makefile to increase the +likelyhood of all child devices already being loaded at the time of +probing, preventing unnecessary deferred probes. + +Signed-off-by: Bernhard Frauendienst <kernel@nospam.obeliks.de> +--- + drivers/mtd/Kconfig | 2 + + drivers/mtd/Makefile | 3 + + drivers/mtd/composite/Kconfig | 12 +++ + drivers/mtd/composite/Makefile | 6 ++ + drivers/mtd/composite/virt_concat.c | 128 ++++++++++++++++++++++++++++ + 5 files changed, 151 insertions(+) + create mode 100644 drivers/mtd/composite/Kconfig + create mode 100644 drivers/mtd/composite/Makefile + create mode 100644 drivers/mtd/composite/virt_concat.c + +diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig +index 5a2d71729b9a..de18bc568e3e 100644 +--- a/drivers/mtd/Kconfig ++++ b/drivers/mtd/Kconfig +@@ -342,4 +342,6 @@ source "drivers/mtd/spi-nor/Kconfig" + + source "drivers/mtd/ubi/Kconfig" + ++source "drivers/mtd/composite/Kconfig" ++ + endif # MTD +diff --git a/drivers/mtd/Makefile b/drivers/mtd/Makefile +index d6f8f625e1ff..a6c5f134c35d 100644 +--- a/drivers/mtd/Makefile ++++ b/drivers/mtd/Makefile +@@ -36,3 +36,6 @@ obj-y += chips/ lpddr/ maps/ devices/ nand/ onenand/ tests/ + + obj-$(CONFIG_MTD_SPI_NOR) += spi-nor/ + obj-$(CONFIG_MTD_UBI) += ubi/ ++ ++# Composite drivers must be loaded last ++obj-y += composite/ +diff --git a/drivers/mtd/composite/Kconfig b/drivers/mtd/composite/Kconfig +new file mode 100644 +index 000000000000..0490fc0284bb +--- /dev/null ++++ b/drivers/mtd/composite/Kconfig +@@ -0,0 +1,12 @@ ++menu "Composite MTD device drivers" ++ depends on MTD!=n ++ ++config MTD_VIRT_CONCAT ++ tristate "Virtual concat MTD device" ++ help ++ This driver allows creation of a virtual MTD concat device, which ++ concatenates multiple underlying MTD devices to a single device. ++ This is required by some SoC boards where multiple memory banks are ++ used as one device with partitions spanning across device boundaries. ++ ++endmenu +diff --git a/drivers/mtd/composite/Makefile b/drivers/mtd/composite/Makefile +new file mode 100644 +index 000000000000..8421a0a30606 +--- /dev/null ++++ b/drivers/mtd/composite/Makefile +@@ -0,0 +1,6 @@ ++# SPDX-License-Identifier: GPL-2.0 ++# ++# linux/drivers/mtd/composite/Makefile ++# ++ ++obj-$(CONFIG_MTD_VIRT_CONCAT) += virt_concat.o +diff --git a/drivers/mtd/composite/virt_concat.c b/drivers/mtd/composite/virt_concat.c +new file mode 100644 +index 000000000000..bfd432188c35 +--- /dev/null ++++ b/drivers/mtd/composite/virt_concat.c +@@ -0,0 +1,128 @@ ++// SPDX-License-Identifier: GPL-2.0+ ++/* ++ * Virtual concat MTD device driver ++ * ++ * Copyright (C) 2018 Bernhard Frauendienst ++ * Author: Bernhard Frauendienst, kernel@nospam.obeliks.de ++ */ ++ ++#include <linux/module.h> ++#include <linux/device.h> ++#include <linux/mtd/concat.h> ++#include <linux/mtd/mtd.h> ++#include <linux/mtd/partitions.h> ++#include <linux/of.h> ++#include <linux/of_platform.h> ++#include <linux/slab.h> ++ ++/* ++ * struct of_virt_concat - platform device driver data. ++ * @cmtd the final mtd_concat device ++ * @num_devices the number of devices in @devices ++ * @devices points to an array of devices already loaded ++ */ ++struct of_virt_concat { ++ struct mtd_info *cmtd; ++ int num_devices; ++ struct mtd_info **devices; ++}; ++ ++static int virt_concat_remove(struct platform_device *pdev) ++{ ++ struct of_virt_concat *info; ++ int i; ++ ++ info = platform_get_drvdata(pdev); ++ if (!info) ++ return 0; ++ ++ // unset data for when this is called after a probe error ++ platform_set_drvdata(pdev, NULL); ++ ++ if (info->cmtd) { ++ mtd_device_unregister(info->cmtd); ++ mtd_concat_destroy(info->cmtd); ++ } ++ ++ if (info->devices) { ++ for (i = 0; i < info->num_devices; i++) ++ put_mtd_device(info->devices[i]); ++ } ++ ++ return 0; ++} ++ ++static int virt_concat_probe(struct platform_device *pdev) ++{ ++ struct device_node *node = pdev->dev.of_node; ++ struct of_phandle_iterator it; ++ struct of_virt_concat *info; ++ struct mtd_info *mtd; ++ int err = 0, count; ++ ++ count = of_count_phandle_with_args(node, "devices", NULL); ++ if (count <= 0) ++ return -EINVAL; ++ ++ info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); ++ if (!info) ++ return -ENOMEM; ++ info->devices = devm_kcalloc(&pdev->dev, count, ++ sizeof(*(info->devices)), GFP_KERNEL); ++ if (!info->devices) { ++ err = -ENOMEM; ++ goto err_remove; ++ } ++ ++ platform_set_drvdata(pdev, info); ++ ++ of_for_each_phandle(&it, err, node, "devices", NULL, 0) { ++ mtd = get_mtd_device_by_node(it.node); ++ if (IS_ERR(mtd)) { ++ of_node_put(it.node); ++ err = -EPROBE_DEFER; ++ goto err_remove; ++ } ++ ++ info->devices[info->num_devices++] = mtd; ++ } ++ ++ info->cmtd = mtd_concat_create(info->devices, info->num_devices, ++ dev_name(&pdev->dev)); ++ if (!info->cmtd) { ++ err = -ENXIO; ++ goto err_remove; ++ } ++ ++ info->cmtd->dev.parent = &pdev->dev; ++ mtd_set_of_node(info->cmtd, node); ++ mtd_device_register(info->cmtd, NULL, 0); ++ ++ return 0; ++ ++err_remove: ++ virt_concat_remove(pdev); ++ ++ return err; ++} ++ ++static const struct of_device_id virt_concat_of_match[] = { ++ { .compatible = "mtd-concat", }, ++ { /* sentinel */ } ++}; ++MODULE_DEVICE_TABLE(of, virt_concat_of_match); ++ ++static struct platform_driver virt_concat_driver = { ++ .probe = virt_concat_probe, ++ .remove = virt_concat_remove, ++ .driver = { ++ .name = "virt-mtdconcat", ++ .of_match_table = virt_concat_of_match, ++ }, ++}; ++ ++module_platform_driver(virt_concat_driver); ++ ++MODULE_LICENSE("GPL v2"); ++MODULE_AUTHOR("Bernhard Frauendienst <kernel@nospam.obeliks.de>"); ++MODULE_DESCRIPTION("Virtual concat MTD device driver"); +-- +2.18.0 + |