cmd_nandbcb: Support secondary boot address of imx8mn

Add support of secondary boot address for imx8mn. The secondary
boot address is hardcoded in the fuse. The value is calculated
from there according to the following description:

The fuse IMG_CNTN_SET1_OFFSET (0x490[22:19]) is defined as follows:
- Secondary boot is disabled if fuse value is bigger than 10, n = fuse
  value bigger than 10.
- n == 0: Offset = 4MB
- n == 2: Offset = 1MB
- Others & n <= 10 : Offset = 1MB*2^n
- For FlexSPI boot, the valid values are: 0, 1, 2, 3, 4, 5, 6, and 7.

Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>

1 files changed, 38 insertions, 2 deletions

diff --git a/arch/arm/mach-imx/cmd_nandbcb.c b/arch/arm/mach-imx/cmd_nandbcb.c
index 646da019866..f119e9f88d5 100644
--- a/arch/arm/mach-imx/cmd_nandbcb.c
+++ b/arch/arm/mach-imx/cmd_nandbcb.c
@@ -132,6 +132,7 @@ static struct platform_config imx8q_plat_config = {
 
 /* boot search related variables and definitions */
 static int g_boot_search_count = 4;
+static int g_boot_secondary_offset;
 static int g_boot_search_stride;
 static int g_pages_per_stride;
 
@@ -275,9 +276,9 @@ static int nandbcb_set_boot_config(int argc, char * const argv[],
 	boot_stream2_address = ((maxsize - boot_stream1_address) / 2 +
 			       boot_stream1_address);
 
-	if (boot_cfg->secondary_boot_stream_off_in_MB)
+	if (g_boot_secondary_offset)
 		boot_stream2_address =
-			(loff_t)boot_cfg->secondary_boot_stream_off_in_MB * 1024 * 1024;
+			(loff_t)g_boot_secondary_offset * 1024 * 1024;
 
 	max_boot_stream_size = boot_stream2_address - boot_stream1_address;
 
@@ -1269,6 +1270,36 @@ static bool check_fingerprint(void *data, int fingerprint)
 	return (*(int *)(data + off) == fingerprint);
 }
 
+static int fuse_secondary_boot(u32 bank, u32 word, u32 mask, u32 off)
+{
+	int err;
+	u32 val;
+	int ret;
+
+	err = fuse_read(bank, word, &val);
+	if (err)
+		return 0;
+
+	val = (val & mask) >> off;
+
+	if (val > 10)
+		return 0;
+
+	switch (val) {
+	case 0:
+		ret = 4;
+		break;
+	case 1:
+		ret = 1;
+		break;
+	default:
+		ret = 2 << val;
+		break;
+	}
+
+	return ret;
+};
+
 static int fuse_to_search_count(u32 bank, u32 word, u32 mask, u32 off)
 {
 	int err;
@@ -1506,6 +1537,11 @@ static int do_nandbcb(struct cmd_tbl *cmdtp, int flag, int argc,
 		       g_boot_search_count);
 	}
 
+	if (plat_config.misc_flags & FIRMWARE_SECONDARY_FIXED_ADDR) {
+		if (is_imx8mn())
+			g_boot_secondary_offset = fuse_secondary_boot(2, 1, 0xff0000, 16);
+	}
+
 	cmd = argv[1];
 	--argc;
 	++argv;