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-rw-r--r--drivers/misc/fsl_sec_mon.c146
1 files changed, 146 insertions, 0 deletions
diff --git a/drivers/misc/fsl_sec_mon.c b/drivers/misc/fsl_sec_mon.c
new file mode 100644
index 0000000000..d482a7db9c
--- /dev/null
+++ b/drivers/misc/fsl_sec_mon.c
@@ -0,0 +1,146 @@
+/*
+ * Copyright 2015 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <fsl_sec_mon.h>
+
+int change_sec_mon_state(u32 initial_state, u32 final_state)
+{
+ struct ccsr_sec_mon_regs *sec_mon_regs = (void *)
+ (CONFIG_SYS_SEC_MON_ADDR);
+ u32 sts = sec_mon_in32(&sec_mon_regs->hp_stat);
+ int timeout = 10;
+
+ if ((sts & HPSR_SSM_ST_MASK) != initial_state)
+ return -1;
+
+ if (initial_state == HPSR_SSM_ST_TRUST) {
+ switch (final_state) {
+ case HPSR_SSM_ST_NON_SECURE:
+ printf("SEC_MON state transitioning to Soft Fail.\n");
+ sec_mon_setbits32(&sec_mon_regs->hp_com, HPCOMR_SW_SV);
+
+ /*
+ * poll till SEC_MON is in
+ * Soft Fail state
+ */
+ while (((sts & HPSR_SSM_ST_MASK) !=
+ HPSR_SSM_ST_SOFT_FAIL)) {
+ while (timeout) {
+ sts = sec_mon_in32
+ (&sec_mon_regs->hp_stat);
+
+ if ((sts & HPSR_SSM_ST_MASK) ==
+ HPSR_SSM_ST_SOFT_FAIL)
+ break;
+
+ udelay(10);
+ timeout--;
+ }
+ }
+
+ if (timeout == 0) {
+ printf("SEC_MON state transition timeout.\n");
+ return -1;
+ }
+
+ timeout = 10;
+
+ printf("SEC_MON state transitioning to Non Secure.\n");
+ sec_mon_setbits32(&sec_mon_regs->hp_com, HPCOMR_SSM_ST);
+
+ /*
+ * poll till SEC_MON is in
+ * Non Secure state
+ */
+ while (((sts & HPSR_SSM_ST_MASK) !=
+ HPSR_SSM_ST_NON_SECURE)) {
+ while (timeout) {
+ sts = sec_mon_in32
+ (&sec_mon_regs->hp_stat);
+
+ if ((sts & HPSR_SSM_ST_MASK) ==
+ HPSR_SSM_ST_NON_SECURE)
+ break;
+
+ udelay(10);
+ timeout--;
+ }
+ }
+
+ if (timeout == 0) {
+ printf("SEC_MON state transition timeout.\n");
+ return -1;
+ }
+ break;
+ case HPSR_SSM_ST_SOFT_FAIL:
+ printf("SEC_MON state transitioning to Soft Fail.\n");
+ sec_mon_setbits32(&sec_mon_regs->hp_com, HPCOMR_SW_FSV);
+
+ /*
+ * polling loop till SEC_MON is in
+ * Soft Fail state
+ */
+ while (((sts & HPSR_SSM_ST_MASK) !=
+ HPSR_SSM_ST_SOFT_FAIL)) {
+ while (timeout) {
+ sts = sec_mon_in32
+ (&sec_mon_regs->hp_stat);
+
+ if ((sts & HPSR_SSM_ST_MASK) ==
+ HPSR_SSM_ST_SOFT_FAIL)
+ break;
+
+ udelay(10);
+ timeout--;
+ }
+ }
+
+ if (timeout == 0) {
+ printf("SEC_MON state transition timeout.\n");
+ return -1;
+ }
+ break;
+ default:
+ return -1;
+ }
+ } else if (initial_state == HPSR_SSM_ST_NON_SECURE) {
+ switch (final_state) {
+ case HPSR_SSM_ST_SOFT_FAIL:
+ printf("SEC_MON state transitioning to Soft Fail.\n");
+ sec_mon_setbits32(&sec_mon_regs->hp_com, HPCOMR_SW_FSV);
+
+ /*
+ * polling loop till SEC_MON is in
+ * Soft Fail state
+ */
+ while (((sts & HPSR_SSM_ST_MASK) !=
+ HPSR_SSM_ST_SOFT_FAIL)) {
+ while (timeout) {
+ sts = sec_mon_in32
+ (&sec_mon_regs->hp_stat);
+
+ if ((sts & HPSR_SSM_ST_MASK) ==
+ HPSR_SSM_ST_SOFT_FAIL)
+ break;
+
+ udelay(10);
+ timeout--;
+ }
+ }
+
+ if (timeout == 0) {
+ printf("SEC_MON state transition timeout.\n");
+ return -1;
+ }
+ break;
+ default:
+ return -1;
+ }
+ }
+
+ return 0;
+}
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