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e90e75b12c
It's meant to provide upstream support for mtd & NVMEM. It's required e.g. for reading MAC address from mtd partition content. It seems to be in a final shape so it's worth testing. Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
94 lines
2.3 KiB
Diff
94 lines
2.3 KiB
Diff
--- a/drivers/mtd/parsers/ofpart_core.c
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+++ b/drivers/mtd/parsers/ofpart_core.c
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@@ -33,6 +33,38 @@ static bool node_has_compatible(struct d
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return of_get_property(pp, "compatible", NULL);
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}
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+static uint8_t * brnboot_get_selected_root_part(struct mtd_info *master,
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+ loff_t offset)
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+{
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+ static uint8_t root_id;
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+ int err, len;
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+
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+ err = mtd_read(master, offset, 0x01, &len, &root_id);
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+
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+ if (mtd_is_bitflip(err) || !err)
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+ return &root_id;
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+
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+ return NULL;
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+}
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+
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+static void brnboot_set_active_root_part(struct mtd_partition *pparts,
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+ struct device_node **part_nodes,
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+ int nr_parts,
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+ uint8_t *root_id)
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+{
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+ int i;
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+
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+ for (i = 0; i < nr_parts; i++) {
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+ int part_root_id;
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+
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+ if (!of_property_read_u32(part_nodes[i], "brnboot,root-id", &part_root_id)
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+ && part_root_id == *root_id) {
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+ pparts[i].name = "firmware";
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+ break;
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+ }
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+ }
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+}
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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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@@ -46,6 +78,8 @@ static int parse_fixed_partitions(struct
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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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+ uint8_t *proot_id = NULL;
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+ struct device_node **part_nodes;
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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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@@ -88,7 +122,9 @@ static int parse_fixed_partitions(struct
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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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+ part_nodes = kcalloc(nr_parts, sizeof(*part_nodes), GFP_KERNEL);
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+
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+ if (!parts || !part_nodes)
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return -ENOMEM;
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i = 0;
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@@ -137,6 +173,11 @@ static int parse_fixed_partitions(struct
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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 (!proot_id && of_device_is_compatible(pp, "brnboot,root-selector"))
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+ proot_id = brnboot_get_selected_root_part(master, parts[i].offset);
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+
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+ part_nodes[i] = pp;
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+
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i++;
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}
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@@ -146,6 +187,11 @@ static int parse_fixed_partitions(struct
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if (quirks && quirks->post_parse)
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quirks->post_parse(master, parts, nr_parts);
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+ if (proot_id)
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+ brnboot_set_active_root_part(parts, part_nodes, nr_parts, proot_id);
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+
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+ kfree(part_nodes);
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+
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*pparts = parts;
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return nr_parts;
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@@ -156,6 +202,7 @@ ofpart_fail:
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ofpart_none:
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of_node_put(pp);
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kfree(parts);
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+ kfree(part_nodes);
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return ret;
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}
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