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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 1b26bab12e85e8b0d382d6775e40d14445249574 / . / drivers / misc / fsl_sec_mon.c
blob: d482a7db9ca1cfd54adfea18cd86374867836ad5 [file] [log] [blame]
gaurav ranafe783782015-02-27 09:44:22 +0530[diff] [blame]1/*
2 * Copyright 2015 Freescale Semiconductor, Inc.
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7#include <common.h>
8#include <fsl_sec_mon.h>
9
10int change_sec_mon_state(u32 initial_state, u32 final_state)
11{
12 struct ccsr_sec_mon_regs *sec_mon_regs = (void *)
13 (CONFIG_SYS_SEC_MON_ADDR);
14 u32 sts = sec_mon_in32(&sec_mon_regs->hp_stat);
15 int timeout = 10;
16
17 if ((sts & HPSR_SSM_ST_MASK) != initial_state)
18 return -1;
19
20 if (initial_state == HPSR_SSM_ST_TRUST) {
21 switch (final_state) {
22 case HPSR_SSM_ST_NON_SECURE:
23 printf("SEC_MON state transitioning to Soft Fail.\n");
24 sec_mon_setbits32(&sec_mon_regs->hp_com, HPCOMR_SW_SV);
25
26 /*
27 * poll till SEC_MON is in
28 * Soft Fail state
29 */
30 while (((sts & HPSR_SSM_ST_MASK) !=
31 HPSR_SSM_ST_SOFT_FAIL)) {
32 while (timeout) {
33 sts = sec_mon_in32
34 (&sec_mon_regs->hp_stat);
35
36 if ((sts & HPSR_SSM_ST_MASK) ==
37 HPSR_SSM_ST_SOFT_FAIL)
38 break;
39
40 udelay(10);
41 timeout--;
42 }
43 }
44
45 if (timeout == 0) {
46 printf("SEC_MON state transition timeout.\n");
47 return -1;
48 }
49
50 timeout = 10;
51
52 printf("SEC_MON state transitioning to Non Secure.\n");
53 sec_mon_setbits32(&sec_mon_regs->hp_com, HPCOMR_SSM_ST);
54
55 /*
56 * poll till SEC_MON is in
57 * Non Secure state
58 */
59 while (((sts & HPSR_SSM_ST_MASK) !=
60 HPSR_SSM_ST_NON_SECURE)) {
61 while (timeout) {
62 sts = sec_mon_in32
63 (&sec_mon_regs->hp_stat);
64
65 if ((sts & HPSR_SSM_ST_MASK) ==
66 HPSR_SSM_ST_NON_SECURE)
67 break;
68
69 udelay(10);
70 timeout--;
71 }
72 }
73
74 if (timeout == 0) {
75 printf("SEC_MON state transition timeout.\n");
76 return -1;
77 }
78 break;
79 case HPSR_SSM_ST_SOFT_FAIL:
80 printf("SEC_MON state transitioning to Soft Fail.\n");
81 sec_mon_setbits32(&sec_mon_regs->hp_com, HPCOMR_SW_FSV);
82
83 /*
84 * polling loop till SEC_MON is in
85 * Soft Fail state
86 */
87 while (((sts & HPSR_SSM_ST_MASK) !=
88 HPSR_SSM_ST_SOFT_FAIL)) {
89 while (timeout) {
90 sts = sec_mon_in32
91 (&sec_mon_regs->hp_stat);
92
93 if ((sts & HPSR_SSM_ST_MASK) ==
94 HPSR_SSM_ST_SOFT_FAIL)
95 break;
96
97 udelay(10);
98 timeout--;
99 }
100 }
101
102 if (timeout == 0) {
103 printf("SEC_MON state transition timeout.\n");
104 return -1;
105 }
106 break;
107 default:
108 return -1;
109 }
110 } else if (initial_state == HPSR_SSM_ST_NON_SECURE) {
111 switch (final_state) {
112 case HPSR_SSM_ST_SOFT_FAIL:
113 printf("SEC_MON state transitioning to Soft Fail.\n");
114 sec_mon_setbits32(&sec_mon_regs->hp_com, HPCOMR_SW_FSV);
115
116 /*
117 * polling loop till SEC_MON is in
118 * Soft Fail state
119 */
120 while (((sts & HPSR_SSM_ST_MASK) !=
121 HPSR_SSM_ST_SOFT_FAIL)) {
122 while (timeout) {
123 sts = sec_mon_in32
124 (&sec_mon_regs->hp_stat);
125
126 if ((sts & HPSR_SSM_ST_MASK) ==
127 HPSR_SSM_ST_SOFT_FAIL)
128 break;
129
130 udelay(10);
131 timeout--;
132 }
133 }
134
135 if (timeout == 0) {
136 printf("SEC_MON state transition timeout.\n");
137 return -1;
138 }
139 break;
140 default:
141 return -1;
142 }
143 }
144
145 return 0;
146}