[PATCH v4 4/5] i.MX: HAB: extend field_return support to imx6

[Fabian Pflug <f.pflug@pengutronix.de>]

Extend the helper for imx_fuse_burn with support for i.MX6 devices.
Create a helper function for i.MX8 and i.MX6 rom the old i.MX8M
function, as they all share the same pattern.

Reviewed-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Fabian Pflug <f.pflug@pengutronix.de>
---
 drivers/hab/hab.c                | 34 +++++++++++++++++++++-------------
 include/mach/imx/ocotp-fusemap.h |  1 +
 2 files changed, 22 insertions(+), 13 deletions(-)

diff --git a/drivers/hab/hab.c b/drivers/hab/hab.c
index 1c747e8a3e..de0a6c73d6 100644
--- a/drivers/hab/hab.c
+++ b/drivers/hab/hab.c
@@ -256,13 +256,7 @@ static int imx8m_hab_revoke_key_ocotp(unsigned key_idx)
 	return ret;
 }
 
-/*
- * The fuse pattern for i.MX8M Plus is 0x28001401, but bit 2 is already set from factory.
- * This means when field return is set, the fuse word value reads 0x28001405
- */
-#define MX8MP_FIELD_RETURN_PATTERN	0x28001401
-
-static int imx8m_hab_field_return_ocotp(void)
+static int imx_hab_field_return_ocotp(uint32_t field, unsigned int value)
 {
 	int ret;
 
@@ -274,13 +268,26 @@ static int imx8m_hab_field_return_ocotp(void)
 	if (ret == 1)
 		return -EINVAL;
 
-	if (cpu_is_mx8mp())
-		ret = imx_ocotp_write_field(MX8MP_OCOTP_FIELD_RETURN,
-					    MX8MP_FIELD_RETURN_PATTERN);
-	else
-		ret = imx_ocotp_write_field(MX8M_OCOTP_FIELD_RETURN, 1);
+	return imx_ocotp_write_field(field, value);
+}
 
-	return ret;
+static int imx6_hab_field_return_ocotp(void)
+{
+	return imx_hab_field_return_ocotp(MX6_OCOTP_FIELD_RETURN, 1);
+}
+
+/*
+ * The fuse pattern for i.MX8M Plus is 0x28001401, but bit 2 is already set from factory.
+ * This means when field return is set, the fuse word value reads 0x28001405
+ */
+#define MX8MP_FIELD_RETURN_PATTERN	0x28001401
+
+static int imx8m_hab_field_return_ocotp(void)
+{
+	if (cpu_is_mx8mp())
+		return imx_hab_field_return_ocotp(MX8MP_OCOTP_FIELD_RETURN,
+						  MX8MP_FIELD_RETURN_PATTERN);
+	return imx_hab_field_return_ocotp(MX8M_OCOTP_FIELD_RETURN, 1);
 }
 
 struct imx_hab_ops {
@@ -310,6 +317,7 @@ static struct imx_hab_ops imx6_hab_ops_ocotp = {
 	.device_locked_down = imx6_hab_device_locked_down_ocotp,
 	.permanent_write_enable = imx_hab_permanent_write_enable_ocotp,
 	.print_status = imx6_hab_print_status,
+	.field_return = imx6_hab_field_return_ocotp,
 };
 
 static struct imx_hab_ops imx8m_hab_ops_ocotp = {
diff --git a/include/mach/imx/ocotp-fusemap.h b/include/mach/imx/ocotp-fusemap.h
index ae10dcef2a..3fd9d6df24 100644
--- a/include/mach/imx/ocotp-fusemap.h
+++ b/include/mach/imx/ocotp-fusemap.h
@@ -103,6 +103,7 @@
 #define MX8M_OCOTP_TZASC_EN		(OCOTP_WORD(0x480) | OCOTP_BIT(11) | OCOTP_WIDTH(1))
 #define MX8MP_OCOTP_ROM_NO_LOG		(OCOTP_WORD(0x480) | OCOTP_BIT(22) | OCOTP_WIDTH(1))
 #define MX8M_OCOTP_RECOVERY_SDMMC_BOOT_DIS	(OCOTP_WORD(0x490) | OCOTP_BIT(23) | OCOTP_WIDTH(1))
+#define MX6_OCOTP_FIELD_RETURN		(OCOTP_WORD(0x6E0) | OCOTP_BIT(0) | OCOTP_WIDTH(1))
 #define MX8M_OCOTP_FIELD_RETURN		(OCOTP_WORD(0x630) | OCOTP_BIT(0) | OCOTP_WIDTH(1))
 #define MX8MP_OCOTP_FIELD_RETURN	(OCOTP_WORD(0x630) | OCOTP_BIT(0) | OCOTP_WIDTH(32))
 #define MX8M_OCOTP_SRK_REVOKE		(OCOTP_WORD(0x670) | OCOTP_BIT(0) | OCOTP_WIDTH(4))

-- 
2.47.3