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Yatharth Kochar736a3bf2015-10-11 14:14:55 +01001/*
Yatharth Kocharede39cb2016-11-14 12:01:04 +00002 * Copyright (c) 2015-2016, ARM Limited and Contributors. All rights reserved.
Yatharth Kochar736a3bf2015-10-11 14:14:55 +01003 *
dp-armfa3cf0b2017-05-03 09:38:09 +01004 * SPDX-License-Identifier: BSD-3-Clause
Yatharth Kochar736a3bf2015-10-11 14:14:55 +01005 */
6
7#include <bl_common.h>
8#include <errno.h>
9#include <platform.h>
10#include <plat_arm.h>
Yatharth Kocharede39cb2016-11-14 12:01:04 +000011#include <sp805.h>
Yatharth Kochar736a3bf2015-10-11 14:14:55 +010012#include <tbbr_img_def.h>
13#include <v2m_def.h>
14
15#define RESET_REASON_WDOG_RESET (0x2)
16
Yatharth Kocharede39cb2016-11-14 12:01:04 +000017void juno_reset_to_aarch32_state(void);
18
19
Yatharth Kochar736a3bf2015-10-11 14:14:55 +010020/*******************************************************************************
21 * The following function checks if Firmware update is needed,
22 * by checking if TOC in FIP image is valid or watchdog reset happened.
23 ******************************************************************************/
24unsigned int bl1_plat_get_next_image_id(void)
25{
26 unsigned int *reset_flags_ptr = (unsigned int *)SSC_GPRETN;
27 unsigned int *nv_flags_ptr = (unsigned int *)
28 (V2M_SYSREGS_BASE + V2M_SYS_NVFLAGS);
29 /*
30 * Check if TOC is invalid or watchdog reset happened.
31 */
32 if ((arm_io_is_toc_valid() != 1) ||
33 ((*reset_flags_ptr & RESET_REASON_WDOG_RESET) &&
34 ((*nv_flags_ptr == -EAUTH) || (*nv_flags_ptr == -ENOENT))))
35 return NS_BL1U_IMAGE_ID;
36
37 return BL2_IMAGE_ID;
38}
39
40/*******************************************************************************
41 * On JUNO update the arg2 with address of SCP_BL2U image info.
42 ******************************************************************************/
43void bl1_plat_set_ep_info(unsigned int image_id,
44 entry_point_info_t *ep_info)
45{
46 if (image_id == BL2U_IMAGE_ID) {
47 image_desc_t *image_desc = bl1_plat_get_image_desc(SCP_BL2U_IMAGE_ID);
48 ep_info->args.arg2 = (unsigned long)&image_desc->image_info;
49 }
50}
51
52/*******************************************************************************
53 * On Juno clear SYS_NVFLAGS and wait for watchdog reset.
54 ******************************************************************************/
Dan Handley89f8f332015-12-15 14:28:24 +000055__dead2 void bl1_plat_fwu_done(void *client_cookie, void *reserved)
Yatharth Kochar736a3bf2015-10-11 14:14:55 +010056{
57 unsigned int *nv_flags_clr = (unsigned int *)
58 (V2M_SYSREGS_BASE + V2M_SYS_NVFLAGSCLR);
59 unsigned int *nv_flags_ptr = (unsigned int *)
60 (V2M_SYSREGS_BASE + V2M_SYS_NVFLAGS);
61
62 /* Clear the NV flags register. */
63 *nv_flags_clr = *nv_flags_ptr;
64
65 while (1)
66 wfi();
67}
Yatharth Kocharede39cb2016-11-14 12:01:04 +000068
69#if JUNO_AARCH32_EL3_RUNTIME
70void bl1_plat_prepare_exit(entry_point_info_t *ep_info)
71{
72#if !ARM_DISABLE_TRUSTED_WDOG
73 /* Disable watchdog before leaving BL1 */
74 sp805_stop(ARM_SP805_TWDG_BASE);
75#endif
76
77 juno_reset_to_aarch32_state();
78}
79#endif /* JUNO_AARCH32_EL3_RUNTIME */