linux-kernel - [PATCH 3/9] remoteproc: Parse ELF file to find resource table address

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Message-Id: <1360496352-29482-4-git-send-email-sjur.brandeland@stericsson.com>
Date:	Sun, 10 Feb 2013 12:39:06 +0100
From:	sjur.brandeland@...ricsson.com
To:	Ido Yariv <ido@...ery.com>, Ohad Ben-Cohen <ohad@...ery.com>
Cc:	linux-kernel@...r.kernel.org,
	Dmitry Tarnyagin <dmitry.tarnyagin@...ricsson.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Erwan Yvin <erwan.yvin@...ricsson.com>, sjur@...ndeland.net,
	Sjur Brændeland <sjur.brandeland@...ricsson.com>
Subject: [PATCH 3/9] remoteproc: Parse ELF file to find resource table address

From: Sjur Brændeland <sjur.brandeland@...ricsson.com>

Add function find_rsc_table_va to firmware ops. This function
returns the location of the resource table in shared memory
after loading.

Signed-off-by: Sjur Brændeland <sjur.brandeland@...ricsson.com>
---
 drivers/remoteproc/remoteproc_elf_loader.c |   17 ++++++++++++++++-
 drivers/remoteproc/remoteproc_internal.h   |   13 +++++++++++++
 2 files changed, 29 insertions(+), 1 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_elf_loader.c b/drivers/remoteproc/remoteproc_elf_loader.c
index a958950..3137fba 100644
--- a/drivers/remoteproc/remoteproc_elf_loader.c
+++ b/drivers/remoteproc/remoteproc_elf_loader.c
@@ -312,9 +312,24 @@ rproc_elf_find_rsc_table(struct rproc *rproc, const struct firmware *fw,
 	return table;
 }
 
+struct resource_table *rproc_elf_get_rsctab_addr(struct rproc *rproc,
+						 const struct firmware *fw)
+{
+	struct elf32_shdr *shdr;
+
+	shdr = find_rsc_shdr(&rproc->dev, (struct elf32_hdr *)fw->data,
+				fw->size);
+	if (!shdr)
+		return NULL;
+
+	/* Find resource table in loaded segments */
+	return rproc_da_to_va(rproc, shdr->sh_addr, shdr->sh_size);
+}
+
 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
+	.get_boot_addr = rproc_elf_get_boot_addr,
+	.get_rsctab_addr = rproc_elf_get_rsctab_addr
 };
diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
index 7bb6648..3a5cb7d 100644
--- a/drivers/remoteproc/remoteproc_internal.h
+++ b/drivers/remoteproc/remoteproc_internal.h
@@ -32,6 +32,7 @@ struct rproc;
  *			expects to find it
  * @sanity_check:	sanity check the fw image
  * @get_boot_addr:	get boot address to entry point specified in firmware
+ * @get_rsctab_addr:	get resouce table address as specified in firmware
  */
 struct rproc_fw_ops {
 	struct resource_table *(*find_rsc_table) (struct rproc *rproc,
@@ -40,6 +41,8 @@ struct rproc_fw_ops {
 	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);
+	struct resource_table *(*get_rsctab_addr)(struct rproc *rproc,
+						const struct firmware *fw);
 };
 
 /* from remoteproc_core.c */
@@ -102,6 +105,16 @@ struct resource_table *rproc_find_rsc_table(struct rproc *rproc,
 	return NULL;
 }
 
+static inline
+struct resource_table *rproc_get_rsctab_addr(struct rproc *rproc,
+				const struct firmware *fw)
+{
+	if (rproc->fw_ops->get_rsctab_addr)
+		return rproc->fw_ops->get_rsctab_addr(rproc, fw);
+
+	return NULL;
+}
+
 extern const struct rproc_fw_ops rproc_elf_fw_ops;
 
 #endif /* REMOTEPROC_INTERNAL_H */
-- 
1.7.5.4

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