diff options
Diffstat (limited to 'target/linux/sunxi/patches-4.1/112-mtd-add-dt-nand-partition-parser.patch')
| -rw-r--r-- | target/linux/sunxi/patches-4.1/112-mtd-add-dt-nand-partition-parser.patch | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/target/linux/sunxi/patches-4.1/112-mtd-add-dt-nand-partition-parser.patch b/target/linux/sunxi/patches-4.1/112-mtd-add-dt-nand-partition-parser.patch new file mode 100644 index 0000000..76f0051 --- /dev/null +++ b/target/linux/sunxi/patches-4.1/112-mtd-add-dt-nand-partition-parser.patch @@ -0,0 +1,152 @@ +From 0460e9868fd82a3675db02f6ceb6edfd8501c194 Mon Sep 17 00:00:00 2001 +From: Boris BREZILLON <boris.brezillon@free-electrons.com> +Date: Mon, 28 Jul 2014 14:31:42 +0200 +Subject: [PATCH] mtd: nand: Add DT NAND partition parser + +Add a of_nandpart_parse function to help parsing NAND partitions from DT. +This function should be called from NAND controller drivers just after the +nand_scan_tail in place of mtd_device_parse_register. +The caller can specify a parser function to retrieve HW specific +informations from the DT. + +Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com> +Signed-off-by: Hans de Goede <hdegoede@redhat.com> +--- + drivers/mtd/nand/ofnandpart.c | 104 ++++++++++++++++++++++++++++++++++++++++++ + include/linux/mtd/nand.h | 17 +++++++ + 2 files changed, 121 insertions(+) + create mode 100644 drivers/mtd/nand/ofnandpart.c + +--- /dev/null ++++ b/drivers/mtd/nand/ofnandpart.c +@@ -0,0 +1,104 @@ ++/* ++ * NAND Flash partitions described by the OF (or flattened) device tree ++ * ++ * Copyright © 2014 Boris BREZILLON <b.brezillon.dev@gmail.com> ++ * ++ * This program is free software; you can redistribute it and/or modify it ++ * under the terms of the GNU General Public License as published by the ++ * Free Software Foundation; either version 2 of the License, or (at your ++ * option) any later version. ++ */ ++ ++#include <linux/module.h> ++#include <linux/init.h> ++#include <linux/of.h> ++#include <linux/mtd/mtd.h> ++#include <linux/slab.h> ++#include <linux/mtd/nand.h> ++ ++static inline bool node_has_compatible(struct device_node *pp) ++{ ++ return of_get_property(pp, "compatible", NULL); ++} ++ ++int ofnandpart_parse(struct mtd_info *master, ++ const struct ofnandpart_data *data) ++{ ++ struct device_node *node; ++ const char *partname; ++ struct device_node *pp; ++ int i; ++ ++ if (!data) ++ return 0; ++ ++ node = data->node; ++ if (!node) ++ return 0; ++ ++ i = 0; ++ for_each_child_of_node(node, pp) { ++ const __be32 *reg; ++ int len; ++ int a_cells, s_cells; ++ uint64_t offset, size; ++ uint32_t mask_flags = 0; ++ struct nand_part *part; ++ ++ if (node_has_compatible(pp)) ++ continue; ++ ++ reg = of_get_property(pp, "reg", &len); ++ if (!reg) ++ continue; ++ ++ a_cells = of_n_addr_cells(pp); ++ s_cells = of_n_size_cells(pp); ++ offset = of_read_number(reg, a_cells); ++ size = of_read_number(reg + a_cells, s_cells); ++ ++ partname = of_get_property(pp, "label", &len); ++ if (!partname) ++ partname = of_get_property(pp, "name", &len); ++ ++ if (of_get_property(pp, "read-only", &len)) ++ mask_flags |= MTD_WRITEABLE; ++ ++ if (of_get_property(pp, "lock", &len)) ++ mask_flags |= MTD_POWERUP_LOCK; ++ ++ if (data->parse) ++ part = data->parse(data->priv, master, pp); ++ else ++ part = nandpart_alloc(); ++ ++ if (IS_ERR(part)) ++ continue; ++ ++ part->offset = offset; ++ part->master = master; ++ part->mtd.name = partname; ++ part->mtd.size = size; ++ part->mtd.flags = mask_flags; ++ ++ if (nand_add_partition(master, part)) { ++ if (part->release) ++ part->release(part); ++ continue; ++ } ++ ++ i++; ++ } ++ ++ if (!i) { ++ of_node_put(pp); ++ pr_err("No valid partition found on %s\n", node->full_name); ++ } ++ ++ return i; ++} ++EXPORT_SYMBOL(ofnandpart_parse); ++ ++MODULE_LICENSE("GPL"); ++MODULE_DESCRIPTION("Parser for NAND flash partitioning information in device tree"); ++MODULE_AUTHOR("Boris BREZILLON"); +--- a/include/linux/mtd/nand.h ++++ b/include/linux/mtd/nand.h +@@ -1014,6 +1014,23 @@ static inline int jedec_feature(struct n + : 0; + } + ++/** ++ * struct ofnandpart_data - struct used to retrieve NAND partitions from a DT ++ * node ++ * @parse: driver specific parser function ++ * @priv: driver private data ++ * @node: OF node containing NAND partitions ++ */ ++struct ofnandpart_data { ++ struct nand_part *(*parse)(void *priv, struct mtd_info *master, ++ struct device_node *pp); ++ void *priv; ++ struct device_node *node; ++}; ++ ++int ofnandpart_parse(struct mtd_info *master, ++ const struct ofnandpart_data *data); ++ + /* + * struct nand_sdr_timings - SDR NAND chip timings + * |