remoteproc: Support custom firmware handlers

Firmware handling is made customizable.
This is done by creating a separate ops structure for the
firmware functions that depends on a particular firmware
format (such as ELF). The ELF functions are default used
unless the HW driver explicitly injects another firmware
handler by updating rproc->fw_ops.
The function rproc_da_to_va() is exported, as custom
firmware handlers may need to use this function.

Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
[ohad: namespace fixes, whitespace fixes, style fixes]
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>

3 files changed, 77 insertions, 16 deletions

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index c68b3bb567f4..f4d6f7bb91fd 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -172,6 +172,7 @@ void *rproc_da_to_va(struct rproc *rproc, u64 da, int len)
 
         return ptr;
 }
+EXPORT_SYMBOL(rproc_da_to_va);
 
 int rproc_alloc_vring(struct rproc_vdev *rvdev, int i)
 {
@@ -1150,6 +1151,9 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
 
         atomic_set(&rproc->power, 0);
 
+        /* Set ELF as the default fw_ops handler */
+        rproc->fw_ops = &rproc_elf_fw_ops;
+
         mutex_init(&rproc->lock);
 
         idr_init(&rproc->notifyids);
diff --git a/drivers/remoteproc/remoteproc_elf_loader.c b/drivers/remoteproc/remoteproc_elf_loader.c
index 2c6fe6ad2d95..6eebd01ea985 100644
--- a/drivers/remoteproc/remoteproc_elf_loader.c
+++ b/drivers/remoteproc/remoteproc_elf_loader.c
@@ -33,14 +33,14 @@
 #include "remoteproc_internal.h"
 
 /**
- * rproc_fw_sanity_check() - Sanity Check ELF firmware image
+ * rproc_elf_sanity_check() - Sanity Check ELF firmware image
  * @rproc: the remote processor handle
  * @fw: the ELF firmware image
  *
  * Make sure this fw image is sane.
  */
-int
-rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw)
+static int
+rproc_elf_sanity_check(struct rproc *rproc, const struct firmware *fw)
 {
         const char *name = rproc->firmware;
         struct device *dev = &rproc->dev;
@@ -100,7 +100,7 @@ rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw)
 }
 
 /**
- * rproc_get_boot_addr() - Get rproc's boot address.
+ * rproc_elf_get_boot_addr() - Get rproc's boot address.
  * @rproc: the remote processor handle
  * @fw: the ELF firmware image
  *
@@ -110,7 +110,8 @@ rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw)
  * 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)
+static
+u32 rproc_elf_get_boot_addr(struct rproc *rproc, const struct firmware *fw)
 {
         struct elf32_hdr *ehdr  = (struct elf32_hdr *)fw->data;
 
@@ -118,7 +119,7 @@ u32 rproc_get_boot_addr(struct rproc *rproc, const struct firmware *fw)
 }
 
 /**
- * rproc_load_segments() - load firmware segments to memory
+ * rproc_elf_load_segments() - load firmware segments to memory
  * @rproc: remote processor which will be booted using these fw segments
  * @fw: the ELF firmware image
  *
@@ -141,8 +142,8 @@ u32 rproc_get_boot_addr(struct rproc *rproc, const struct firmware *fw)
  * directly allocate memory for every segment/resource. This is not yet
  * supported, though.
  */
-int
-rproc_load_segments(struct rproc *rproc, const struct firmware *fw)
+static int
+rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw)
 {
         struct device *dev = &rproc->dev;
         struct elf32_hdr *ehdr;
@@ -208,7 +209,7 @@ rproc_load_segments(struct rproc *rproc, const struct firmware *fw)
 }
 
 /**
- * rproc_find_rsc_table() - find the resource table
+ * rproc_elf_find_rsc_table() - find the resource table
  * @rproc: the rproc handle
  * @fw: the ELF firmware image
  * @tablesz: place holder for providing back the table size
@@ -222,8 +223,8 @@ rproc_load_segments(struct rproc *rproc, const struct firmware *fw)
  * size into @tablesz. If a valid table isn't found, NULL is returned
  * (and @tablesz isn't set).
  */
-struct resource_table *
-rproc_find_rsc_table(struct rproc *rproc, const struct firmware *fw,
+static struct resource_table *
+rproc_elf_find_rsc_table(struct rproc *rproc, const struct firmware *fw,
                                                         int *tablesz)
 {
         struct elf32_hdr *ehdr;
@@ -285,3 +286,10 @@ rproc_find_rsc_table(struct rproc *rproc, const struct firmware *fw,
 
         return table;
 }
+
+const struct rproc_fw_ops rproc_elf_fw_ops = {
+        .load = rproc_elf_load_segments,
+        .find_rsc_table = rproc_elf_find_rsc_table,
+        .sanity_check = rproc_elf_sanity_check,
+        .get_boot_addr = rproc_elf_get_boot_addr
+};
diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
index a44e1926e4c3..a690ebe7aa51 100644
--- a/drivers/remoteproc/remoteproc_internal.h
+++ b/drivers/remoteproc/remoteproc_internal.h
@@ -25,6 +25,23 @@
 
 struct rproc;
 
+/**
+ * struct rproc_fw_ops - firmware format specific operations.
+ * @find_rsc_table:     finds the resource table inside the firmware image
+ * @load:               load firmeware to memory, where the remote processor
+ *                      expects to find it
+ * @sanity_check:       sanity check the fw image
+ * @get_boot_addr:      get boot address to entry point specified in firmware
+ */
+struct rproc_fw_ops {
+        struct resource_table *(*find_rsc_table) (struct rproc *rproc,
+                                                const struct firmware *fw,
+                                                int *tablesz);
+        int (*load)(struct rproc *rproc, const struct firmware *fw);
+        int (*sanity_check)(struct rproc *rproc, const struct firmware *fw);
+        u32 (*get_boot_addr)(struct rproc *rproc, const struct firmware *fw);
+};
+
 /* from remoteproc_core.c */
 void rproc_release(struct kref *kref);
 irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id);
@@ -47,11 +64,43 @@ int rproc_alloc_vring(struct rproc_vdev *rvdev, int i);
 
 void *rproc_da_to_va(struct rproc *rproc, u64 da, int len);
 
+static inline
+int rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw)
+{
+        if (rproc->fw_ops->sanity_check)
+                return rproc->fw_ops->sanity_check(rproc, fw);
+
+        return 0;
+}
+
+static inline
+u32 rproc_get_boot_addr(struct rproc *rproc, const struct firmware *fw)
+{
+        if (rproc->fw_ops->get_boot_addr)
+                return rproc->fw_ops->get_boot_addr(rproc, fw);
+
+        return 0;
+}
+
+static inline
+int rproc_load_segments(struct rproc *rproc, const struct firmware *fw)
+{
+        if (rproc->fw_ops->load)
+                return rproc->fw_ops->load(rproc, fw);
+
+        return -EINVAL;
+}
+
+static inline
 struct resource_table *rproc_find_rsc_table(struct rproc *rproc,
-                                                const struct firmware *fw,
-                                                int *tablesz);
-int rproc_load_segments(struct rproc *rproc, const struct firmware *fw);
-int rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw);
-u32 rproc_get_boot_addr(struct rproc *rproc, const struct firmware *fw);
+                                const struct firmware *fw, int *tablesz)
+{
+        if (rproc->fw_ops->find_rsc_table)
+                return rproc->fw_ops->find_rsc_table(rproc, fw, tablesz);
+
+        return NULL;
+}
+
+extern const struct rproc_fw_ops rproc_elf_fw_ops;
 
 #endif /* REMOTEPROC_INTERNAL_H */