diff options
Diffstat (limited to 'lib/fdtdec.c')
| -rw-r--r-- | lib/fdtdec.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/lib/fdtdec.c b/lib/fdtdec.c index a51dc5e986..efec3c2717 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -1261,6 +1261,231 @@ __weak void *board_fdt_blob_setup(void) } #endif +int fdtdec_set_phandle(void *blob, int node, uint32_t phandle) +{ + fdt32_t value = cpu_to_fdt32(phandle); + + return fdt_setprop(blob, node, "phandle", &value, sizeof(value)); +} + +static int fdtdec_init_reserved_memory(void *blob) +{ + int na, ns, node, err; + fdt32_t value; + + /* inherit #address-cells and #size-cells from the root node */ + na = fdt_address_cells(blob, 0); + ns = fdt_size_cells(blob, 0); + + node = fdt_add_subnode(blob, 0, "reserved-memory"); + if (node < 0) + return node; + + err = fdt_setprop(blob, node, "ranges", NULL, 0); + if (err < 0) + return err; + + value = cpu_to_fdt32(ns); + + err = fdt_setprop(blob, node, "#size-cells", &value, sizeof(value)); + if (err < 0) + return err; + + value = cpu_to_fdt32(na); + + err = fdt_setprop(blob, node, "#address-cells", &value, sizeof(value)); + if (err < 0) + return err; + + return node; +} + +int fdtdec_add_reserved_memory(void *blob, const char *basename, + const struct fdt_memory *carveout, + uint32_t *phandlep) +{ + fdt32_t cells[4] = {}, *ptr = cells; + uint32_t upper, lower, phandle; + int parent, node, na, ns, err; + char name[64]; + + /* create an empty /reserved-memory node if one doesn't exist */ + parent = fdt_path_offset(blob, "/reserved-memory"); + if (parent < 0) { + parent = fdtdec_init_reserved_memory(blob); + if (parent < 0) + return parent; + } + + /* only 1 or 2 #address-cells and #size-cells are supported */ + na = fdt_address_cells(blob, parent); + if (na < 1 || na > 2) + return -FDT_ERR_BADNCELLS; + + ns = fdt_size_cells(blob, parent); + if (ns < 1 || ns > 2) + return -FDT_ERR_BADNCELLS; + + /* find a matching node and return the phandle to that */ + fdt_for_each_subnode(node, blob, parent) { + const char *name = fdt_get_name(blob, node, NULL); + phys_addr_t addr, size; + + addr = fdtdec_get_addr_size(blob, node, "reg", &size); + if (addr == FDT_ADDR_T_NONE) { + debug("failed to read address/size for %s\n", name); + continue; + } + + if (addr == carveout->start && (addr + size) == carveout->end) { + *phandlep = fdt_get_phandle(blob, node); + return 0; + } + } + + /* + * Unpack the start address and generate the name of the new node + * base on the basename and the unit-address. + */ + lower = fdt_addr_unpack(carveout->start, &upper); + + if (na > 1 && upper > 0) + snprintf(name, sizeof(name), "%s@%x,%x", basename, upper, + lower); + else { + if (upper > 0) { + debug("address %08x:%08x exceeds addressable space\n", + upper, lower); + return -FDT_ERR_BADVALUE; + } + + snprintf(name, sizeof(name), "%s@%x", basename, lower); + } + + node = fdt_add_subnode(blob, parent, name); + if (node < 0) + return node; + + err = fdt_generate_phandle(blob, &phandle); + if (err < 0) + return err; + + err = fdtdec_set_phandle(blob, node, phandle); + if (err < 0) + return err; + + /* store one or two address cells */ + if (na > 1) + *ptr++ = cpu_to_fdt32(upper); + + *ptr++ = cpu_to_fdt32(lower); + + /* store one or two size cells */ + lower = fdt_size_unpack(carveout->end - carveout->start + 1, &upper); + + if (ns > 1) + *ptr++ = cpu_to_fdt32(upper); + + *ptr++ = cpu_to_fdt32(lower); + + err = fdt_setprop(blob, node, "reg", cells, (na + ns) * sizeof(*cells)); + if (err < 0) + return err; + + /* return the phandle for the new node for the caller to use */ + if (phandlep) + *phandlep = phandle; + + return 0; +} + +int fdtdec_get_carveout(const void *blob, const char *node, const char *name, + unsigned int index, struct fdt_memory *carveout) +{ + const fdt32_t *prop; + uint32_t phandle; + int offset, len; + fdt_size_t size; + + offset = fdt_path_offset(blob, node); + if (offset < 0) + return offset; + + prop = fdt_getprop(blob, offset, name, &len); + if (!prop) { + debug("failed to get %s for %s\n", name, node); + return -FDT_ERR_NOTFOUND; + } + + if ((len % sizeof(phandle)) != 0) { + debug("invalid phandle property\n"); + return -FDT_ERR_BADPHANDLE; + } + + if (len < (sizeof(phandle) * (index + 1))) { + debug("invalid phandle index\n"); + return -FDT_ERR_BADPHANDLE; + } + + phandle = fdt32_to_cpu(prop[index]); + + offset = fdt_node_offset_by_phandle(blob, phandle); + if (offset < 0) { + debug("failed to find node for phandle %u\n", phandle); + return offset; + } + + carveout->start = fdtdec_get_addr_size_auto_noparent(blob, offset, + "reg", 0, &size, + true); + if (carveout->start == FDT_ADDR_T_NONE) { + debug("failed to read address/size from \"reg\" property\n"); + return -FDT_ERR_NOTFOUND; + } + + carveout->end = carveout->start + size - 1; + + return 0; +} + +int fdtdec_set_carveout(void *blob, const char *node, const char *prop_name, + unsigned int index, const char *name, + const struct fdt_memory *carveout) +{ + uint32_t phandle; + int err, offset; + fdt32_t value; + + /* XXX implement support for multiple phandles */ + if (index > 0) { + debug("invalid index %u\n", index); + return -FDT_ERR_BADOFFSET; + } + + err = fdtdec_add_reserved_memory(blob, name, carveout, &phandle); + if (err < 0) { + debug("failed to add reserved memory: %d\n", err); + return err; + } + + offset = fdt_path_offset(blob, node); + if (offset < 0) { + debug("failed to find offset for node %s: %d\n", node, offset); + return offset; + } + + value = cpu_to_fdt32(phandle); + + err = fdt_setprop(blob, offset, prop_name, &value, sizeof(value)); + if (err < 0) { + debug("failed to set %s property for node %s: %d\n", prop_name, + node, err); + return err; + } + + return 0; +} + int fdtdec_setup(void) { #if CONFIG_IS_ENABLED(OF_CONTROL) |