1 /*
2  * Copyright (c) 2015-2016, ARM Limited and Contributors. All rights reserved.
3  *
4  * SPDX-License-Identifier: BSD-3-Clause
5  */
6 
7 #include <bl_common.h>
8 #include <errno.h>
9 #include <plat_arm.h>
10 #include <platform.h>
11 #include <sp805.h>
12 #include <tbbr_img_def.h>
13 #include <v2m_def.h>
14 
15 #define RESET_REASON_WDOG_RESET		(0x2)
16 
17 void juno_reset_to_aarch32_state(void);
18 
19 
20 /*******************************************************************************
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  ******************************************************************************/
bl1_plat_get_next_image_id(void)24 unsigned 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  ******************************************************************************/
bl1_plat_set_ep_info(unsigned int image_id,entry_point_info_t * ep_info)43 void 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  ******************************************************************************/
bl1_plat_fwu_done(void * client_cookie,void * reserved)55 __dead2 void bl1_plat_fwu_done(void *client_cookie, void *reserved)
56 {
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 }
68 
69 #if JUNO_AARCH32_EL3_RUNTIME
bl1_plat_prepare_exit(entry_point_info_t * ep_info)70 void 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 */
80