From 4de512018ba7d57f1672be21c7459281f7c97514 Mon Sep 17 00:00:00 2001
From: Patrick Delaunay <patrick.delaunay@st.com>
Date: Wed, 19 Jul 2017 16:39:22 +0200
Subject: dfu: allow dfu read on partition greater than 2GB

solve issue on get_medium_size() function
the detection of error is a simple test < 0
but for ARM platform, long is 32bits and 2GB = 0x80000000
is seen as error.

I solve the issue by changing the prototype fo the function
to separate size and result.
This patch prepare the next patch with size change to u64.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>

diff --git a/drivers/dfu/dfu.c b/drivers/dfu/dfu.c
index ceb33e3..c777016 100644
--- a/drivers/dfu/dfu.c
+++ b/drivers/dfu/dfu.c
@@ -339,9 +339,9 @@ int dfu_read(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 		if (dfu->i_buf_start == NULL)
 			return -ENOMEM;
 
-		dfu->r_left = dfu->get_medium_size(dfu);
-		if (dfu->r_left < 0)
-			return dfu->r_left;
+		ret = dfu->get_medium_size(dfu, &dfu->r_left);
+		if (ret < 0)
+			return ret;
 
 		debug("%s: %s %ld [B]\n", __func__, dfu->name, dfu->r_left);
 
diff --git a/drivers/dfu/dfu_mmc.c b/drivers/dfu/dfu_mmc.c
index 926ccbd..d918f95 100644
--- a/drivers/dfu/dfu_mmc.c
+++ b/drivers/dfu/dfu_mmc.c
@@ -209,23 +209,23 @@ int dfu_flush_medium_mmc(struct dfu_entity *dfu)
 	return ret;
 }
 
-long dfu_get_medium_size_mmc(struct dfu_entity *dfu)
+int dfu_get_medium_size_mmc(struct dfu_entity *dfu, long *size)
 {
 	int ret;
-	long len;
 
 	switch (dfu->layout) {
 	case DFU_RAW_ADDR:
-		return dfu->data.mmc.lba_size * dfu->data.mmc.lba_blk_size;
+		*size = dfu->data.mmc.lba_size * dfu->data.mmc.lba_blk_size;
+		return 0;
 	case DFU_FS_FAT:
 	case DFU_FS_EXT4:
 		dfu_file_buf_filled = -1;
-		ret = mmc_file_op(DFU_OP_SIZE, dfu, NULL, &len);
+		ret = mmc_file_op(DFU_OP_SIZE, dfu, NULL, size);
 		if (ret < 0)
 			return ret;
-		if (len > CONFIG_SYS_DFU_MAX_FILE_SIZE)
+		if (*size > CONFIG_SYS_DFU_MAX_FILE_SIZE)
 			return -1;
-		return len;
+		return 0;
 	default:
 		printf("%s: Layout (%s) not (yet) supported!\n", __func__,
 		       dfu_get_layout(dfu->layout));
diff --git a/drivers/dfu/dfu_nand.c b/drivers/dfu/dfu_nand.c
index 97cd608..ed4ceb7 100644
--- a/drivers/dfu/dfu_nand.c
+++ b/drivers/dfu/dfu_nand.c
@@ -114,9 +114,11 @@ static int dfu_write_medium_nand(struct dfu_entity *dfu,
 	return ret;
 }
 
-long dfu_get_medium_size_nand(struct dfu_entity *dfu)
+int dfu_get_medium_size_nand(struct dfu_entity *dfu, long *size)
 {
-	return dfu->data.nand.size;
+	*size = dfu->data.nand.size;
+
+	return 0;
 }
 
 static int dfu_read_medium_nand(struct dfu_entity *dfu, u64 offset, void *buf,
diff --git a/drivers/dfu/dfu_ram.c b/drivers/dfu/dfu_ram.c
index c1b0021..b95cb9f 100644
--- a/drivers/dfu/dfu_ram.c
+++ b/drivers/dfu/dfu_ram.c
@@ -41,9 +41,11 @@ static int dfu_write_medium_ram(struct dfu_entity *dfu, u64 offset,
 	return dfu_transfer_medium_ram(DFU_OP_WRITE, dfu, offset, buf, len);
 }
 
-long dfu_get_medium_size_ram(struct dfu_entity *dfu)
+int dfu_get_medium_size_ram(struct dfu_entity *dfu, long *size)
 {
-	return dfu->data.ram.size;
+	*size = dfu->data.ram.size;
+
+	return 0;
 }
 
 static int dfu_read_medium_ram(struct dfu_entity *dfu, u64 offset,
diff --git a/drivers/dfu/dfu_sf.c b/drivers/dfu/dfu_sf.c
index b6d5fe2..2b26f2c 100644
--- a/drivers/dfu/dfu_sf.c
+++ b/drivers/dfu/dfu_sf.c
@@ -12,9 +12,11 @@
 #include <spi.h>
 #include <spi_flash.h>
 
-static long dfu_get_medium_size_sf(struct dfu_entity *dfu)
+static int dfu_get_medium_size_sf(struct dfu_entity *dfu, long *size)
 {
-	return dfu->data.sf.size;
+	*size = dfu->data.sf.size;
+
+	return 0;
 }
 
 static int dfu_read_medium_sf(struct dfu_entity *dfu, u64 offset, void *buf,
diff --git a/include/dfu.h b/include/dfu.h
index f39d3f1..5b621b5 100644
--- a/include/dfu.h
+++ b/include/dfu.h
@@ -110,7 +110,7 @@ struct dfu_entity {
 		struct sf_internal_data sf;
 	} data;
 
-	long (*get_medium_size)(struct dfu_entity *dfu);
+	int (*get_medium_size)(struct dfu_entity *dfu, long *size);
 
 	int (*read_medium)(struct dfu_entity *dfu,
 			u64 offset, void *buf, long *len);
-- 
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