mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-24 15:56:49 +00:00
6be2305da8
Changelog: * https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.1.5 Signed-off-by: Jonas Gorski <jogo@openwrt.org> SVN-Revision: 46598
153 lines
3.9 KiB
Diff
153 lines
3.9 KiB
Diff
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
|
|
*
|