[PATCH 1/9] i.MX: HABv4: fix SRK_LOCK for i.MX8M devices

[Marco Felsch]

All current known i.MX8M devices: i.MX8MQ, i.MX8MP, i.MX8MN, i.MX8MM use
an other fuse to lock the SRK hash. Fix this by refactoring
imx_hab_write_srk_hash_ocotp() and make the lock fusing device specific.

Fixes: 6c4d5bb5acfe ("i.MX: HABv4: implement interface for i.MX8MQ")
Signed-off-by: Marco Felsch <m.felsch at pengutronix.de>
---
 drivers/hab/hab.c                | 34 +++++++++++++++++++++++++++++---
 include/mach/imx/ocotp-fusemap.h |  1 +
 2 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/drivers/hab/hab.c b/drivers/hab/hab.c
index ed091058d8fb..28a091841a69 100644
--- a/drivers/hab/hab.c
+++ b/drivers/hab/hab.c
@@ -128,7 +128,7 @@ static int imx_hab_read_srk_hash_ocotp(u8 *__srk)
 	return 0;
 }
 
-static int imx_hab_write_srk_hash_ocotp(const u8 *__newsrk, unsigned flags)
+static int imx_hab_write_srk_hash_ocotp(const u8 *__newsrk)
 {
 	u32 *newsrk = (u32 *)__newsrk;
 	int ret, i;
@@ -139,6 +139,17 @@ static int imx_hab_write_srk_hash_ocotp(const u8 *__newsrk, unsigned flags)
 			return ret;
 	}
 
+	return 0;
+}
+
+static int imx6_hab_write_srk_hash_ocotp(const u8 *newsrk, unsigned flags)
+{
+	int ret;
+
+	ret = imx_hab_write_srk_hash_ocotp(newsrk);
+	if (ret)
+		return ret;
+
 	if (flags & IMX_SRK_HASH_WRITE_LOCK) {
 		ret = imx_ocotp_write_field(OCOTP_SRK_LOCK, 1);
 		if (ret < 0)
@@ -148,6 +159,23 @@ static int imx_hab_write_srk_hash_ocotp(const u8 *__newsrk, unsigned flags)
 	return 0;
 }
 
+static int imx8m_hab_write_srk_hash_ocotp(const u8 *newsrk, unsigned flags)
+{
+	int ret;
+
+	ret = imx_hab_write_srk_hash_ocotp(newsrk);
+	if (ret)
+		return ret;
+
+	if (flags & IMX_SRK_HASH_WRITE_LOCK) {
+		ret = imx_ocotp_write_field(MX8M_OCOTP_SRK_LOCK, 1);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
 static int imx_hab_permanent_write_enable_ocotp(int enable)
 {
 	return imx_ocotp_permanent_write(enable);
@@ -222,7 +250,7 @@ static struct imx_hab_ops imx_hab_ops_iim = {
 };
 
 static struct imx_hab_ops imx6_hab_ops_ocotp = {
-	.write_srk_hash = imx_hab_write_srk_hash_ocotp,
+	.write_srk_hash = imx6_hab_write_srk_hash_ocotp,
 	.read_srk_hash =  imx_hab_read_srk_hash_ocotp,
 	.lockdown_device = imx6_hab_lockdown_device_ocotp,
 	.device_locked_down = imx6_hab_device_locked_down_ocotp,
@@ -231,7 +259,7 @@ static struct imx_hab_ops imx6_hab_ops_ocotp = {
 };
 
 static struct imx_hab_ops imx8m_hab_ops_ocotp = {
-	.write_srk_hash = imx_hab_write_srk_hash_ocotp,
+	.write_srk_hash = imx8m_hab_write_srk_hash_ocotp,
 	.read_srk_hash =  imx_hab_read_srk_hash_ocotp,
 	.lockdown_device = imx8m_hab_lockdown_device_ocotp,
 	.device_locked_down = imx8m_hab_device_locked_down_ocotp,
diff --git a/include/mach/imx/ocotp-fusemap.h b/include/mach/imx/ocotp-fusemap.h
index 823273895502..c4f94e61e8f8 100644
--- a/include/mach/imx/ocotp-fusemap.h
+++ b/include/mach/imx/ocotp-fusemap.h
@@ -54,6 +54,7 @@
 #define OCOTP_GP2			(OCOTP_WORD(0x670) | OCOTP_BIT(0) | OCOTP_WIDTH(32))
 #define OCOTP_PAD_SETTINGS		(OCOTP_WORD(0x6d0) | OCOTP_BIT(0) | OCOTP_WIDTH(6))
 /* i.MX8M moved the security related fuses */
+#define MX8M_OCOTP_SRK_LOCK		(OCOTP_WORD(0x400) | OCOTP_BIT(9) | OCOTP_WIDTH(1))
 #define MX8M_OCOTP_SEC_CONFIG_1		(OCOTP_WORD(0x470) | OCOTP_BIT(25) | OCOTP_WIDTH(1))
 #define MX8MQ_OCOTP_DIR_BT_DIS		(OCOTP_WORD(0x470) | OCOTP_BIT(27) | OCOTP_WIDTH(1))
 
-- 
2.39.2