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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2015 Freescale Semiconductor, Inc.
*/
#include <common.h>
#include <fsl_sec_mon.h>
#include <linux/delay.h>
static u32 get_sec_mon_state(void)
{
struct ccsr_sec_mon_regs *sec_mon_regs = (void *)
(CFG_SYS_SEC_MON_ADDR);
return sec_mon_in32(&sec_mon_regs->hp_stat) & HPSR_SSM_ST_MASK;
}
static int set_sec_mon_state_non_sec(void)
{
u32 sts;
int timeout = 10;
struct ccsr_sec_mon_regs *sec_mon_regs = (void *)
(CFG_SYS_SEC_MON_ADDR);
sts = get_sec_mon_state();
switch (sts) {
/*
* If initial state is check or Non-Secure, then set the Software
* Security Violation Bit and transition to Non-Secure State.
*/
case HPSR_SSM_ST_CHECK:
printf("SEC_MON state transitioning to Non Secure.\n");
sec_mon_setbits32(&sec_mon_regs->hp_com, HPCOMR_SW_SV);
/* polling loop till SEC_MON is in Non Secure state */
while (timeout) {
sts = get_sec_mon_state();
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;
/*
* If initial state is Trusted, Secure or Soft-Fail, then first set
* the Software Security Violation Bit and transition to Soft-Fail
* State.
*/
case HPSR_SSM_ST_TRUST:
case HPSR_SSM_ST_SECURE:
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_SV);
/* polling loop till SEC_MON is in Soft-Fail state */
while (timeout) {
sts = get_sec_mon_state();
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;
/*
* If SSM Soft Fail to Non-Secure State Transition
* disable is not set, then set SSM_ST bit and
* transition to Non-Secure State.
*/
if ((sec_mon_in32(&sec_mon_regs->hp_com) &
HPCOMR_SSM_SFNS_DIS) == 0) {
printf("SEC_MON state transitioning to Non Secure.\n");
sec_mon_setbits32(&sec_mon_regs->hp_com, HPCOMR_SSM_ST);
/* polling loop till SEC_MON is in Non Secure*/
while (timeout) {
sts = get_sec_mon_state();
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;
default:
printf("SEC_MON already in Non Secure state.\n");
return 0;
}
return 0;
}
static int set_sec_mon_state_soft_fail(void)
{
u32 sts;
int timeout = 10;
struct ccsr_sec_mon_regs *sec_mon_regs = (void *)
(CFG_SYS_SEC_MON_ADDR);
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 (timeout) {
sts = get_sec_mon_state();
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;
}
return 0;
}
int set_sec_mon_state(u32 state)
{
int ret = -1;
switch (state) {
case HPSR_SSM_ST_NON_SECURE:
ret = set_sec_mon_state_non_sec();
break;
case HPSR_SSM_ST_SOFT_FAIL:
ret = set_sec_mon_state_soft_fail();
break;
default:
printf("SEC_MON state transition not supported.\n");
return 0;
}
return ret;
}
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