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author | Simon Glass <sjg@chromium.org> | 2018-06-11 22:07:18 +0300 |
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committer | Simon Glass <sjg@chromium.org> | 2018-07-09 18:11:00 +0300 |
commit | 964cadc445f1437e63f1d2b4fffd233ac053c6e6 (patch) | |
tree | e753eaf7147763c8d2a7aa8f20ab086c7a36c863 /drivers/core/of_extra.c | |
parent | 5e0a7341cdda182f310624d5c336fb48be04a703 (diff) | |
download | u-boot-964cadc445f1437e63f1d2b4fffd233ac053c6e6.tar.xz |
dm: core: Add a function to decode a memory region
Add a way to decode a memory region, including the memory type (sram or
sdram) and its start address and size.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/core/of_extra.c')
-rw-r--r-- | drivers/core/of_extra.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/drivers/core/of_extra.c b/drivers/core/of_extra.c index 3243caa5d1..aa48917ddd 100644 --- a/drivers/core/of_extra.c +++ b/drivers/core/of_extra.c @@ -34,3 +34,84 @@ int ofnode_read_fmap_entry(ofnode node, struct fmap_entry *entry) return 0; } + +int ofnode_decode_region(ofnode node, const char *prop_name, fdt_addr_t *basep, + fdt_size_t *sizep) +{ + const fdt_addr_t *cell; + int len; + + debug("%s: %s: %s\n", __func__, ofnode_get_name(node), prop_name); + cell = ofnode_get_property(node, prop_name, &len); + if (!cell || (len < sizeof(fdt_addr_t) * 2)) { + debug("cell=%p, len=%d\n", cell, len); + return -1; + } + + *basep = fdt_addr_to_cpu(*cell); + *sizep = fdt_size_to_cpu(cell[1]); + debug("%s: base=%08lx, size=%lx\n", __func__, (ulong)*basep, + (ulong)*sizep); + + return 0; +} + +int ofnode_decode_memory_region(ofnode config_node, const char *mem_type, + const char *suffix, fdt_addr_t *basep, + fdt_size_t *sizep) +{ + char prop_name[50]; + const char *mem; + fdt_size_t size, offset_size; + fdt_addr_t base, offset; + ofnode node; + + if (!ofnode_valid(config_node)) { + config_node = ofnode_path("/config"); + if (!ofnode_valid(config_node)) { + debug("%s: Cannot find /config node\n", __func__); + return -ENOENT; + } + } + if (!suffix) + suffix = ""; + + snprintf(prop_name, sizeof(prop_name), "%s-memory%s", mem_type, + suffix); + mem = ofnode_read_string(config_node, prop_name); + if (!mem) { + debug("%s: No memory type for '%s', using /memory\n", __func__, + prop_name); + mem = "/memory"; + } + + node = ofnode_path(mem); + if (!ofnode_valid(node)) { + debug("%s: Failed to find node '%s'\n", __func__, mem); + return -ENOENT; + } + + /* + * Not strictly correct - the memory may have multiple banks. We just + * use the first + */ + if (ofnode_decode_region(node, "reg", &base, &size)) { + debug("%s: Failed to decode memory region %s\n", __func__, + mem); + return -EINVAL; + } + + snprintf(prop_name, sizeof(prop_name), "%s-offset%s", mem_type, + suffix); + if (ofnode_decode_region(config_node, prop_name, &offset, + &offset_size)) { + debug("%s: Failed to decode memory region '%s'\n", __func__, + prop_name); + return -EINVAL; + } + + *basep = base + offset; + *sizep = offset_size; + + return 0; +} |