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- 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
- *
|
