remoteproc: Add function rproc_get_boot_addr

Prepare for introduction of custom firmware loaders by
moving the function operating on ELF data-structures into
separate functions. Move lookup of the boot_addr in the
ELF binary to the function rproc_get_boot_addr().

Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
[rproc_get_boot_addr's kerneldoc: add missing @rproc line]
[rproc_get_boot_addr's kerneldoc: minor style changes]
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>

1 files changed, 19 insertions, 9 deletions

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index e75424b6314c..3173e213940b 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -998,6 +998,24 @@ static int rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw)
         return 0;
 }
 
+/**
+ * rproc_get_boot_addr() - Get rproc's boot address.
+ * @rproc: the remote processor handle
+ * @fw: the ELF firmware image
+ *
+ * This function returns the entry point address of the ELF
+ * image.
+ *
+ * Note that the boot address is not a configurable property of all remote
+ * processors. Some will always boot at a specific hard-coded address.
+ */
+u32 rproc_get_boot_addr(struct rproc *rproc, const struct firmware *fw)
+{
+        struct elf32_hdr *ehdr  = (struct elf32_hdr *)fw->data;
+
+        return ehdr->e_entry;
+}
+
 /*
  * take a firmware and boot a remote processor with it.
  */
@@ -1005,7 +1023,6 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
 {
         struct device *dev = &rproc->dev;
         const char *name = rproc->firmware;
-        struct elf32_hdr *ehdr;
         struct resource_table *table;
         int ret, tablesz;
 
@@ -1013,8 +1030,6 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
         if (ret)
                 return ret;
 
-        ehdr = (struct elf32_hdr *)fw->data;
-
         dev_info(dev, "Booting fw image %s, size %d\n", name, fw->size);
 
         /*
@@ -1027,12 +1042,7 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
                 return ret;
         }
 
-        /*
-         * The ELF entry point is the rproc's boot addr (though this is not
-         * a configurable property of all remote processors: some will always
-         * boot at a specific hardcoded address).
-         */
-        rproc->bootaddr = ehdr->e_entry;
+        rproc->bootaddr = rproc_get_boot_addr(rproc, fw);
 
         /* look for the resource table */
         table = rproc_find_rsc_table(rproc, fw, &tablesz);