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273 lines
6.7 KiB
273 lines
6.7 KiB
// 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 <[email protected]> |
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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 (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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