[PATCH 6/6] nandbcb: read boot search count from fuse for imx8qxp

Peng Fan
2020-05-05T14:04:04Z

From: Han Xu <han.xu@nxp.com>

add support for imx8qxp to read boot search count from fuse in nandbcb

Signed-off-by: Han Xu <han.xu@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
arch/arm/mach-imx/cmd_nandbcb.c | 39 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 38 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-imx/cmd_nandbcb.c b/arch/arm/mach-imx/cmd_nandbcb.c
index ab12b1f1cf..94cae146ce 100644
--- a/arch/arm/mach-imx/cmd_nandbcb.c
+++ b/arch/arm/mach-imx/cmd_nandbcb.c
@@ -27,6 +27,7 @@
#include <mxs_nand.h>
#include <linux/mtd/mtd.h>
#include <nand.h>
+#include <fuse.h>

#include "../../../cmd/legacy-mtd-utils.h"

@@ -1260,6 +1261,35 @@ static bool check_fingerprint(void *data, int fingerprint)
return (*(int *)(data + off) == fingerprint);
}

+static int fuse_to_search_count(u32 bank, u32 word, u32 mask, u32 off)
+{
+ int err;
+ u32 val;
+ int ret;
+
+ /* by default, the boot search count from fuse should be 2 */
+ err = fuse_read(bank, word, &val);
+ if (err)
+ return 2;
+
+ val = (val & mask) >> off;
+
+ switch (val) {
+ case 0:
+ ret = 2;
+ break;
+ case 1:
+ case 2:
+ case 3:
+ ret = 1 << val;
+ break;
+ default:
+ ret = 2;
+ }
+
+ return ret;
+}
+
static int nandbcb_dump(struct boot_config *boot_cfg)
{
int i;
@@ -1459,7 +1489,14 @@ static int do_nandbcb(cmd_tbl_t *cmdtp, int flag, int argc,
return CMD_RET_FAILURE;
}

- /* TODO: set the boot search count if need to read from fuse */
+ if (plat_config.misc_flags & BT_SEARCH_CNT_FROM_FUSE) {
+ if (is_imx8qxp()) {
+ g_boot_search_count = fuse_to_search_count(0, 720,
+ 0xc0, 6);
+ printf("search count set to %d from fuse\n",
+ g_boot_search_count);
+ }
+ }

cmd = argv[1];
--argc;
--
2.16.4