293 lines
7.4 KiB
C
293 lines
7.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Flash partitions described by the OF (or flattened) device tree
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*
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* Copyright © 2006 MontaVista Software Inc.
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* Author: Vitaly Wool <vwool@ru.mvista.com>
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*
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* Revised to handle newer style flash binding by:
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* Copyright © 2007 David Gibson, IBM Corporation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/mtd/mtd.h>
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#include <linux/slab.h>
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#include <linux/mtd/partitions.h>
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#include "ofpart_bcm4908.h"
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#include "ofpart_linksys_ns.h"
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struct fixed_partitions_quirks {
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int (*post_parse)(struct mtd_info *mtd, struct mtd_partition *parts, int nr_parts);
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};
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static struct fixed_partitions_quirks bcm4908_partitions_quirks = {
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.post_parse = bcm4908_partitions_post_parse,
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};
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static struct fixed_partitions_quirks linksys_ns_partitions_quirks = {
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.post_parse = linksys_ns_partitions_post_parse,
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};
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static const struct of_device_id parse_ofpart_match_table[];
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static bool node_has_compatible(struct device_node *pp)
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{
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return of_get_property(pp, "compatible", NULL);
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}
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static int parse_fixed_partitions(struct mtd_info *master,
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const struct mtd_partition **pparts,
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struct mtd_part_parser_data *data)
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{
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const struct fixed_partitions_quirks *quirks;
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const struct of_device_id *of_id;
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struct mtd_partition *parts;
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struct device_node *mtd_node;
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struct device_node *ofpart_node;
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const char *partname;
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struct device_node *pp;
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int nr_parts, i, ret = 0;
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bool dedicated = true;
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/* Pull of_node from the master device node */
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mtd_node = mtd_get_of_node(master);
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if (!mtd_node)
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return 0;
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if (!master->parent) { /* Master */
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ofpart_node = of_get_child_by_name(mtd_node, "partitions");
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if (!ofpart_node) {
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/*
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* We might get here even when ofpart isn't used at all (e.g.,
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* when using another parser), so don't be louder than
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* KERN_DEBUG
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*/
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pr_debug("%s: 'partitions' subnode not found on %pOF. Trying to parse direct subnodes as partitions.\n",
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master->name, mtd_node);
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ofpart_node = mtd_node;
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dedicated = false;
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}
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} else { /* Partition */
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ofpart_node = mtd_node;
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}
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of_id = of_match_node(parse_ofpart_match_table, ofpart_node);
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if (dedicated && !of_id) {
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/* The 'partitions' subnode might be used by another parser */
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return 0;
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}
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quirks = of_id ? of_id->data : NULL;
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/* First count the subnodes */
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nr_parts = 0;
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for_each_child_of_node(ofpart_node, pp) {
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if (!dedicated && node_has_compatible(pp))
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continue;
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nr_parts++;
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}
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if (nr_parts == 0)
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return 0;
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parts = kcalloc(nr_parts, sizeof(*parts), GFP_KERNEL);
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if (!parts)
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return -ENOMEM;
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i = 0;
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for_each_child_of_node(ofpart_node, pp) {
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const __be32 *reg;
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int len;
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int a_cells, s_cells;
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if (!dedicated && node_has_compatible(pp))
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continue;
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reg = of_get_property(pp, "reg", &len);
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if (!reg) {
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if (dedicated) {
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pr_debug("%s: ofpart partition %pOF (%pOF) missing reg property.\n",
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master->name, pp,
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mtd_node);
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goto ofpart_fail;
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} else {
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nr_parts--;
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continue;
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}
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}
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a_cells = of_n_addr_cells(pp);
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s_cells = of_n_size_cells(pp);
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if (!dedicated && s_cells == 0) {
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/*
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* This is a ugly workaround to not create
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* regression on devices that are still creating
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* partitions as direct children of the nand controller.
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* This can happen in case the nand controller node has
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* #size-cells equal to 0 and the firmware (e.g.
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* U-Boot) just add the partitions there assuming
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* 32-bit addressing.
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*
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* If you get this warning your firmware and/or DTS
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* should be really fixed.
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*
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* This is working only for devices smaller than 4GiB.
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*/
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pr_warn("%s: ofpart partition %pOF (%pOF) #size-cells is wrongly set to <0>, assuming <1> for parsing partitions.\n",
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master->name, pp, mtd_node);
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s_cells = 1;
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}
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if (len / 4 != a_cells + s_cells) {
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pr_debug("%s: ofpart partition %pOF (%pOF) error parsing reg property.\n",
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master->name, pp,
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mtd_node);
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goto ofpart_fail;
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}
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parts[i].offset = of_read_number(reg, a_cells);
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parts[i].size = of_read_number(reg + a_cells, s_cells);
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parts[i].of_node = pp;
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partname = of_get_property(pp, "label", &len);
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if (!partname)
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partname = of_get_property(pp, "name", &len);
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parts[i].name = partname;
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if (of_get_property(pp, "read-only", &len))
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parts[i].mask_flags |= MTD_WRITEABLE;
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if (of_get_property(pp, "lock", &len))
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parts[i].mask_flags |= MTD_POWERUP_LOCK;
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if (of_property_read_bool(pp, "slc-mode"))
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parts[i].add_flags |= MTD_SLC_ON_MLC_EMULATION;
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i++;
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}
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if (!nr_parts)
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goto ofpart_none;
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if (quirks && quirks->post_parse)
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quirks->post_parse(master, parts, nr_parts);
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*pparts = parts;
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return nr_parts;
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ofpart_fail:
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pr_err("%s: error parsing ofpart partition %pOF (%pOF)\n",
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master->name, pp, mtd_node);
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ret = -EINVAL;
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ofpart_none:
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of_node_put(pp);
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kfree(parts);
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return ret;
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}
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static const struct of_device_id parse_ofpart_match_table[] = {
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/* Generic */
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{ .compatible = "fixed-partitions" },
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/* Customized */
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{ .compatible = "brcm,bcm4908-partitions", .data = &bcm4908_partitions_quirks, },
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{ .compatible = "linksys,ns-partitions", .data = &linksys_ns_partitions_quirks, },
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{},
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};
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MODULE_DEVICE_TABLE(of, parse_ofpart_match_table);
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static struct mtd_part_parser ofpart_parser = {
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.parse_fn = parse_fixed_partitions,
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.name = "fixed-partitions",
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.of_match_table = parse_ofpart_match_table,
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};
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static int parse_ofoldpart_partitions(struct mtd_info *master,
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const struct mtd_partition **pparts,
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struct mtd_part_parser_data *data)
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{
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struct mtd_partition *parts;
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struct device_node *dp;
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int i, plen, nr_parts;
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const struct {
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__be32 offset, len;
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} *part;
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const char *names;
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/* Pull of_node from the master device node */
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dp = mtd_get_of_node(master);
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if (!dp)
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return 0;
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part = of_get_property(dp, "partitions", &plen);
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if (!part)
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return 0; /* No partitions found */
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pr_warn("Device tree uses obsolete partition map binding: %pOF\n", dp);
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nr_parts = plen / sizeof(part[0]);
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parts = kcalloc(nr_parts, sizeof(*parts), GFP_KERNEL);
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if (!parts)
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return -ENOMEM;
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names = of_get_property(dp, "partition-names", &plen);
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for (i = 0; i < nr_parts; i++) {
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parts[i].offset = be32_to_cpu(part->offset);
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parts[i].size = be32_to_cpu(part->len) & ~1;
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/* bit 0 set signifies read only partition */
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if (be32_to_cpu(part->len) & 1)
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parts[i].mask_flags = MTD_WRITEABLE;
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if (names && (plen > 0)) {
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int len = strlen(names) + 1;
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parts[i].name = names;
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plen -= len;
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names += len;
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} else {
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parts[i].name = "unnamed";
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}
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part++;
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}
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*pparts = parts;
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return nr_parts;
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}
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static struct mtd_part_parser ofoldpart_parser = {
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.parse_fn = parse_ofoldpart_partitions,
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.name = "ofoldpart",
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};
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static int __init ofpart_parser_init(void)
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{
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register_mtd_parser(&ofpart_parser);
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register_mtd_parser(&ofoldpart_parser);
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return 0;
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}
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static void __exit ofpart_parser_exit(void)
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{
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deregister_mtd_parser(&ofpart_parser);
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deregister_mtd_parser(&ofoldpart_parser);
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}
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module_init(ofpart_parser_init);
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module_exit(ofpart_parser_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Parser for MTD partitioning information in device tree");
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MODULE_AUTHOR("Vitaly Wool, David Gibson");
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/*
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* When MTD core cannot find the requested parser, it tries to load the module
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* with the same name. Since we provide the ofoldpart parser, we should have
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* the corresponding alias.
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*/
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MODULE_ALIAS("fixed-partitions");
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MODULE_ALIAS("ofoldpart");
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