1 /*
2 * Copyright (c) 2015-2024, Arm Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <errno.h>
8
9 #include <common/bl_common.h>
10 #include <common/debug.h>
11 #include <common/tbbr/tbbr_img_def.h>
12 #include <drivers/arm/css/sds.h>
13 #include <drivers/arm/sp805.h>
14 #include <plat/arm/common/plat_arm.h>
15 #include <plat/arm/common/arm_def.h>
16 #include <plat/common/platform.h>
17 #include <platform_def.h>
18
19 void juno_reset_to_aarch32_state(void);
20
is_watchdog_reset(void)21 static int is_watchdog_reset(void)
22 {
23 #if !CSS_USE_SCMI_SDS_DRIVER
24 #define RESET_REASON_WDOG_RESET (0x2)
25 const uint32_t *reset_flags_ptr = (const uint32_t *)SSC_GPRETN;
26
27 if ((*reset_flags_ptr & RESET_REASON_WDOG_RESET) != 0)
28 return 1;
29
30 return 0;
31 #else
32 int ret;
33 uint32_t scp_reset_synd_flags;
34
35 ret = sds_init(SDS_SCP_AP_REGION_ID);
36 if (ret != SDS_OK) {
37 ERROR("SCP SDS initialization failed\n");
38 panic();
39 }
40
41 ret = sds_struct_read(SDS_SCP_AP_REGION_ID,
42 SDS_RESET_SYNDROME_STRUCT_ID,
43 SDS_RESET_SYNDROME_OFFSET,
44 &scp_reset_synd_flags,
45 SDS_RESET_SYNDROME_SIZE,
46 SDS_ACCESS_MODE_NON_CACHED);
47 if (ret != SDS_OK) {
48 ERROR("Getting reset reason from SDS failed\n");
49 panic();
50 }
51
52 /* Check if the WATCHDOG_RESET_BIT is set in the reset syndrome */
53 if (scp_reset_synd_flags & SDS_RESET_SYNDROME_AP_WD_RESET_BIT)
54 return 1;
55
56 return 0;
57 #endif
58 }
59
60 /*******************************************************************************
61 * The following function checks if Firmware update is needed,
62 * by checking if TOC in FIP image is valid or watchdog reset happened.
63 ******************************************************************************/
plat_arm_bl1_fwu_needed(void)64 bool plat_arm_bl1_fwu_needed(void)
65 {
66 int32_t nv_flags = (int32_t)mmio_read_32(V2M_SYS_NVFLAGS_ADDR);
67
68 /* Check if TOC is invalid or watchdog reset happened. */
69 return (!arm_io_is_toc_valid() || (((nv_flags == -EAUTH) ||
70 (nv_flags == -ENOENT)) && is_watchdog_reset()));
71 }
72
73 /*******************************************************************************
74 * On JUNO update the arg2 with address of SCP_BL2U image info.
75 ******************************************************************************/
bl1_plat_set_ep_info(unsigned int image_id,entry_point_info_t * ep_info)76 void bl1_plat_set_ep_info(unsigned int image_id,
77 entry_point_info_t *ep_info)
78 {
79 if (image_id == BL2U_IMAGE_ID) {
80 image_desc_t *image_desc = bl1_plat_get_image_desc(SCP_BL2U_IMAGE_ID);
81 ep_info->args.arg2 = (unsigned long)&image_desc->image_info;
82 }
83 }
84
85 /*******************************************************************************
86 * On Juno clear SYS_NVFLAGS and wait for watchdog reset.
87 ******************************************************************************/
bl1_plat_fwu_done(void * client_cookie,void * reserved)88 __dead2 void bl1_plat_fwu_done(void *client_cookie, void *reserved)
89 {
90 uint32_t nv_flags = mmio_read_32(V2M_SYS_NVFLAGS_ADDR);
91
92 /* Clear the NV flags register. */
93 mmio_write_32((V2M_SYSREGS_BASE + V2M_SYS_NVFLAGSCLR),
94 nv_flags);
95
96 /* Setup the watchdog to reset the system as soon as possible */
97 sp805_refresh(ARM_SP805_TWDG_BASE, 1U);
98
99 while (true)
100 wfi();
101 }
102
103 #if JUNO_AARCH32_EL3_RUNTIME
bl1_plat_prepare_exit(entry_point_info_t * ep_info)104 void bl1_plat_prepare_exit(entry_point_info_t *ep_info)
105 {
106 #if !ARM_DISABLE_TRUSTED_WDOG
107 /* Disable watchdog before leaving BL1 */
108 sp805_stop(ARM_SP805_TWDG_BASE);
109 #endif
110
111 juno_reset_to_aarch32_state();
112 }
113 #endif /* JUNO_AARCH32_EL3_RUNTIME */
114
plat_arm_secure_wdt_start(void)115 void plat_arm_secure_wdt_start(void)
116 {
117 sp805_start(ARM_SP805_TWDG_BASE, ARM_TWDG_LOAD_VAL);
118 }
119
plat_arm_secure_wdt_stop(void)120 void plat_arm_secure_wdt_stop(void)
121 {
122 sp805_stop(ARM_SP805_TWDG_BASE);
123 }
124