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authorSascha Hauer <s.hauer@pengutronix.de>2016-03-04 12:04:24 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2016-04-08 13:35:32 +0200
commitc5532a2d36f326577b1bd2743c79fc00b6a41402 (patch)
treeb05508898e26e97119af4e3d3a1784ed4bfc0cc1
parent3abbbbd7c3fb4f5aa376800b11fcf0d2975225a7 (diff)
downloadbarebox-c5532a2d36f326577b1bd2743c79fc00b6a41402.tar.gz
imx-bbu-nand-fcb: factor out layout functions
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
-rw-r--r--common/imx-bbu-nand-fcb.c66
1 files changed, 46 insertions, 20 deletions
diff --git a/common/imx-bbu-nand-fcb.c b/common/imx-bbu-nand-fcb.c
index 3eb9e9b..26b0b29 100644
--- a/common/imx-bbu-nand-fcb.c
+++ b/common/imx-bbu-nand-fcb.c
@@ -300,12 +300,45 @@ static int imx_bbu_erase(struct mtd_info *mtd)
return 0;
}
-static int imx_bbu_write_firmware(struct mtd_info *mtd, unsigned block,
- unsigned num_blocks, void *buf, size_t len)
+/**
+ * imx_bbu_firmware_max_blocks - get max number of blocks for firmware
+ * @mtd: The mtd device
+ *
+ * We use 4 blocks for FCB/DBBT, the rest of the partition is
+ * divided into two equally sized firmware slots. This function
+ * returns the number of blocks available for one firmware slot.
+ * The actually usable size may be smaller due to bad blocks.
+ */
+static int imx_bbu_firmware_max_blocks(struct mtd_info *mtd)
+{
+ return (mtd_div_by_eb(mtd->size, mtd) - 4) / 2;
+}
+
+/**
+ * imx_bbu_firmware_start_block - get start block for a firmware slot
+ * @mtd: The mtd device
+ * @num: The slot number (0 or 1)
+ *
+ * We use 4 blocks for FCB/DBBT, the rest of the partition is
+ * divided into two equally sized firmware slots. This function
+ * returns the start block for the given firmware slot.
+ */
+static int imx_bbu_firmware_start_block(struct mtd_info *mtd, int num)
+{
+ return 4 + num * imx_bbu_firmware_max_blocks(mtd);
+}
+
+static int imx_bbu_write_firmware(struct mtd_info *mtd, unsigned num, void *buf,
+ size_t len)
{
- uint64_t offset = block * mtd->erasesize;
int ret;
size_t written;
+ int num_blocks = imx_bbu_firmware_max_blocks(mtd);
+ int block = imx_bbu_firmware_start_block(mtd, num);
+ uint64_t offset = block * mtd->erasesize;
+
+ pr_info("writing firmware %d to block %d (ofs 0x%08x)\n",
+ num, block, block * mtd->erasesize);
while (len > 0) {
int now = min(len, mtd->erasesize);
@@ -364,7 +397,7 @@ static int imx_bbu_nand_update(struct bbu_handler *handler, struct bbu_data *dat
container_of(handler, struct imx_nand_fcb_bbu_handler, handler);
struct cdev *bcb_cdev;
struct mtd_info *mtd;
- int ret, block_fw1, block_fw2;
+ int ret;
struct fcb_block *fcb;
struct dbbt_block *dbbt;
void *fcb_raw_page, *dbbt_page, *dbbt_data_page;
@@ -374,7 +407,8 @@ static int imx_bbu_nand_update(struct bbu_handler *handler, struct bbu_data *dat
unsigned fw_size, partition_size;
int i;
enum filetype filetype;
- unsigned num_blocks_fcb_dbbt, num_blocks, num_blocks_fw;
+ unsigned num_blocks_fw;
+ int pages_per_block;
filetype = file_detect_type(data->image, data->len);
@@ -392,6 +426,7 @@ static int imx_bbu_nand_update(struct bbu_handler *handler, struct bbu_data *dat
mtd = bcb_cdev->mtd;
partition_size = mtd->size;
+ pages_per_block = mtd->erasesize / mtd->writesize;
fcb_raw_page = xzalloc(mtd->writesize + mtd->oobsize);
@@ -411,17 +446,8 @@ static int imx_bbu_nand_update(struct bbu_handler *handler, struct bbu_data *dat
fw = xzalloc(fw_size);
memcpy(fw, data->image, data->len);
- num_blocks_fcb_dbbt = 4;
- num_blocks = partition_size / mtd->erasesize;
- num_blocks_fw = (num_blocks - num_blocks_fcb_dbbt) / 2;
-
- block_fw1 = num_blocks_fcb_dbbt;
- block_fw2 = num_blocks_fcb_dbbt + num_blocks_fw;
+ num_blocks_fw = imx_bbu_firmware_max_blocks(mtd);
- pr_info("writing first firmware to block %d (ofs 0x%08x)\n",
- block_fw1, block_fw1 * mtd->erasesize);
- pr_info("writing second firmware to block %d (ofs 0x%08x)\n",
- block_fw2, block_fw2 * mtd->erasesize);
pr_info("maximum size per firmware: 0x%08x bytes\n",
num_blocks_fw * mtd->erasesize);
@@ -436,16 +462,16 @@ static int imx_bbu_nand_update(struct bbu_handler *handler, struct bbu_data *dat
if (ret)
goto out;
- ret = imx_bbu_write_firmware(mtd, block_fw1, num_blocks_fw, fw, fw_size);
+ ret = imx_bbu_write_firmware(mtd, 0, fw, fw_size);
if (ret < 0)
goto out;
- ret = imx_bbu_write_firmware(mtd, block_fw2, num_blocks_fw, fw, fw_size);
+ ret = imx_bbu_write_firmware(mtd, 1, fw, fw_size);
if (ret < 0)
goto out;
- fcb->Firmware1_startingPage = block_fw1 * mtd->erasesize / mtd->writesize;
- fcb->Firmware2_startingPage = block_fw2 * mtd->erasesize / mtd->writesize;
+ fcb->Firmware1_startingPage = imx_bbu_firmware_start_block(mtd, 0) * pages_per_block;
+ fcb->Firmware2_startingPage = imx_bbu_firmware_start_block(mtd, 1) * pages_per_block;
fcb->PagesInFirmware1 = ALIGN(data->len, mtd->writesize) / mtd->writesize;
fcb->PagesInFirmware2 = fcb->PagesInFirmware1;
@@ -465,7 +491,7 @@ static int imx_bbu_nand_update(struct bbu_handler *handler, struct bbu_data *dat
dbbt->FingerPrint = 0x54424244;
dbbt->Version = 0x01000000;
- ret = dbbt_data_create(mtd, dbbt_data_page, block_fw2 + num_blocks_fw);
+ ret = dbbt_data_create(mtd, dbbt_data_page, partition_size / mtd->erasesize);
if (ret < 0)
goto out;