diff options
Diffstat (limited to 'common')
| -rw-r--r-- | common/blspec.c | 78 | ||||
| -rw-r--r-- | common/firmware.c | 18 |
2 files changed, 96 insertions, 0 deletions
diff --git a/common/blspec.c b/common/blspec.c index 83b05993dd..7fb62d310f 100644 --- a/common/blspec.c +++ b/common/blspec.c @@ -14,6 +14,7 @@ #include <environment.h> #include <globalvar.h> +#include <firmware.h> #include <readkey.h> #include <common.h> #include <driver.h> @@ -42,6 +43,78 @@ int blspec_entry_var_set(struct blspec_entry *entry, const char *name, val ? strlen(val) + 1 : 0, 1); } +static int blspec_apply_oftree_overlay(char *file, const char *abspath, + int dryrun) +{ + int ret = 0; + struct fdt_header *fdt; + struct device_node *overlay; + char *path; + char *firmware_path; + + path = basprintf("%s/%s", abspath, file); + + fdt = read_file(path, NULL); + if (!fdt) { + pr_warn("unable to read \"%s\"\n", path); + ret = -EINVAL; + goto out; + } + + overlay = of_unflatten_dtb(fdt); + free(fdt); + if (IS_ERR(overlay)) { + ret = PTR_ERR(overlay); + goto out; + } + + if (dryrun) { + pr_info("dry run: skip overlay %s\n", path); + of_delete_node(overlay); + goto out; + } + + /* + * Unfortunately the device tree overlay contains only the filename of + * the firmware and relies on the firmware search paths to find the + * actual file. Use /lib/firmware in the Linux root directory and hope + * for the best. + */ + firmware_path = basprintf("%s/%s", abspath, "/lib/firmware"); + ret = of_firmware_load_overlay(overlay, firmware_path); + free(firmware_path); + if (ret) { + pr_warn("failed to load firmware: skip overlay \"%s\"\n", path); + of_delete_node(overlay); + goto out; + } + + ret = of_register_overlay(overlay); + if (ret) { + pr_warn("cannot register devicetree overlay \"%s\"\n", path); + of_delete_node(overlay); + } + +out: + free(path); + + return ret; +} + +static void blspec_apply_oftree_overlays(const char *overlays, + const char *abspath, int dryrun) +{ + char *overlay; + char *sep, *freep; + + sep = freep = xstrdup(overlays); + + while ((overlay = strsep(&sep, " "))) + blspec_apply_oftree_overlay(overlay, abspath, dryrun); + + free(freep); +} + /* * blspec_boot - boot an entry * @@ -54,6 +127,7 @@ static int blspec_boot(struct bootentry *be, int verbose, int dryrun) struct blspec_entry *entry = container_of(be, struct blspec_entry, entry); int ret; const char *abspath, *devicetree, *options, *initrd, *linuximage; + const char *overlays; const char *appendroot; struct bootm_data data = { .initrd_address = UIMAGE_INVALID_ADDRESS, @@ -73,6 +147,7 @@ static int blspec_boot(struct bootentry *be, int verbose, int dryrun) initrd = blspec_entry_var_get(entry, "initrd"); options = blspec_entry_var_get(entry, "options"); linuximage = blspec_entry_var_get(entry, "linux"); + overlays = blspec_entry_var_get(entry, "devicetree-overlay"); if (entry->rootpath) abspath = entry->rootpath; @@ -92,6 +167,9 @@ static int blspec_boot(struct bootentry *be, int verbose, int dryrun) } } + if (overlays) + blspec_apply_oftree_overlays(overlays, abspath, dryrun); + if (initrd) data.initrd_file = basprintf("%s/%s", abspath, initrd); diff --git a/common/firmware.c b/common/firmware.c index 9d55d73e7a..609cf11822 100644 --- a/common/firmware.c +++ b/common/firmware.c @@ -63,6 +63,24 @@ struct firmware_mgr *firmwaremgr_find(const char *id) } /* + * firmwaremgr_find_by_node - find a firmware device handler + * + * Find a firmware device handler using the device node of the firmware + * handler. This allows to retrieve the firmware handler with a phandle from + * the device tree. + */ +struct firmware_mgr *firmwaremgr_find_by_node(const struct device_node *np) +{ + struct firmware_mgr *mgr; + + list_for_each_entry(mgr, &firmwaremgr_list, list) + if (mgr->handler->dev->parent->device_node == np) + return mgr; + + return NULL; +} + +/* * firmwaremgr_list_handlers - list registered firmware device handlers * in pretty format */ |