[PATCH v2 1/2] splash: support raw image from MMC

[Julien Masson <jmasson@baylibre.com>]

The user has now the choice to specify the splash location in the MMC
as a raw storage.

Signed-off-by: Julien Masson <jmasson@baylibre.com>
---

Changes in v2:
- splash_mmc_read_raw: return -EIO in case of errors
- splash_mmc_read_raw: use IS_ENABLED(CONFIG_CMD_MMC) instead of #ifdef

 common/splash.c        |  6 ++++++
 common/splash_source.c | 26 ++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/common/splash.c b/common/splash.c
index 0e520cc103..5206e35f74 100644
--- a/common/splash.c
+++ b/common/splash.c
@@ -39,6 +39,12 @@ static struct splash_location default_splash_locations[] = {
 		.flags = SPLASH_STORAGE_FS,
 		.devpart = "0:1",
 	},
+	{
+		.name = "mmc_raw",
+		.storage = SPLASH_STORAGE_MMC,
+		.flags = SPLASH_STORAGE_RAW,
+		.devpart = "0:1",
+	},
 	{
 		.name = "usb_fs",
 		.storage = SPLASH_STORAGE_USB,
diff --git a/common/splash_source.c b/common/splash_source.c
index 87e55a54f8..68c9fa371b 100644
--- a/common/splash_source.c
+++ b/common/splash_source.c
@@ -65,6 +65,30 @@ static int splash_nand_read_raw(u32 bmp_load_addr, int offset, size_t read_size)
 }
 #endif
 
+static int splash_mmc_read_raw(u32 bmp_load_addr, struct splash_location *location,
+			       size_t read_size)
+{
+	struct disk_partition partition;
+	struct blk_desc *desc;
+	lbaint_t blkcnt;
+	int ret, n;
+
+	if (!IS_ENABLED(CONFIG_CMD_MMC)) {
+		debug("%s: mmc support not available\n", __func__);
+		return -ENOSYS;
+	}
+
+	ret = part_get_info_by_dev_and_name_or_num("mmc", location->devpart, &desc,
+						   &partition, 1);
+	if (ret < 0)
+		return ret;
+
+	blkcnt = DIV_ROUND_UP(read_size, partition.blksz);
+	n = blk_dread(desc, partition.start, blkcnt, (void *)(uintptr_t)bmp_load_addr);
+
+	return (n == blkcnt) ? 0 : -EIO;
+}
+
 static int splash_storage_read_raw(struct splash_location *location,
 			       u32 bmp_load_addr, size_t read_size)
 {
@@ -75,6 +99,8 @@ static int splash_storage_read_raw(struct splash_location *location,
 
 	offset = location->offset;
 	switch (location->storage) {
+	case SPLASH_STORAGE_MMC:
+		return splash_mmc_read_raw(bmp_load_addr, location, read_size);
 	case SPLASH_STORAGE_NAND:
 		return splash_nand_read_raw(bmp_load_addr, offset, read_size);
 	case SPLASH_STORAGE_SF:
-- 
2.37.3