1 /*
2  * Copyright (c) 2015-2020, Renesas Electronics Corporation. All rights reserved.
3  *
4  * SPDX-License-Identifier: BSD-3-Clause
5  */
6 
7 #include <stdarg.h>
8 #include <stdint.h>
9 
10 #include <platform_def.h>
11 
12 #include <arch_helpers.h>
13 #include <common/debug.h>
14 #include <lib/bakery_lock.h>
15 
16 #include "rcar_def.h"
17 #include "rcar_private.h"
18 #include "rcar_printf.h"
19 
20 #define INDEX_TIMER_COUNT	(4U)
21 
22 #define RCAR_LOG_HEAD	(('T' << 0) | ('L' << 8) | ('O' << 16) | ('G' << 24))
23 
24 /*
25  * The log is initialized and used before BL31 xlat tables are initialized,
26  * therefore the log memory is a device memory at that point. Make sure the
27  * memory is correclty aligned and accessed only with up-to 32bit, aligned,
28  * writes.
29  */
30 CASSERT((RCAR_BL31_LOG_BASE & 0x7) == 0, assert_bl31_log_base_unaligned);
31 CASSERT((RCAR_BL31_LOG_MAX & 0x7) == 0, assert_bl31_log_max_unaligned);
32 
33 extern RCAR_INSTANTIATE_LOCK typedef struct log_head {
34 	uint32_t head;
35 	uint32_t index;
36 	uint32_t size;
37 	uint32_t res;
38 } loghead_t;
39 
40 typedef struct log_map {
41 	loghead_t header;
42 	uint8_t log_data[RCAR_BL31_LOG_MAX];
43 	uint8_t res_data[RCAR_LOG_RES_SIZE];
44 } logmap_t;
45 
rcar_set_log_data(int32_t c)46 int32_t rcar_set_log_data(int32_t c)
47 {
48 	logmap_t *t_log;
49 
50 	t_log = (logmap_t *) RCAR_BL31_LOG_BASE;
51 
52 	rcar_lock_get();
53 
54 	/*
55 	 * If index is broken, then index and size initialize
56 	 */
57 	if (t_log->header.index >= (uint32_t) RCAR_BL31_LOG_MAX) {
58 		t_log->header.index = 0U;
59 		t_log->header.size = 0U;
60 	}
61 	/*
62 	 * data store to log area then index and size renewal
63 	 */
64 	t_log->log_data[t_log->header.index] = (uint8_t) c;
65 	t_log->header.index++;
66 	if (t_log->header.size < t_log->header.index) {
67 		t_log->header.size = t_log->header.index;
68 	}
69 	if (t_log->header.index >= (uint32_t) RCAR_BL31_LOG_MAX) {
70 		t_log->header.index = 0U;
71 	}
72 
73 	rcar_lock_release();
74 
75 	return 1;
76 }
77 
rcar_log_init(void)78 int32_t rcar_log_init(void)
79 {
80 	logmap_t *t_log = (logmap_t *)RCAR_BL31_LOG_BASE;
81 	uint32_t *log_data = (uint32_t *)t_log->log_data;
82 	int16_t init_flag = 0;
83 	int i;
84 
85 	if (t_log->header.head != RCAR_LOG_HEAD) {
86 		/*
87 		 * Log header is not "TLOG", then log area initialize
88 		 */
89 		init_flag = 1;
90 	}
91 	if (t_log->header.index >= (uint32_t) RCAR_BL31_LOG_MAX) {
92 		/*
93 		 * index is broken, then log area initialize
94 		 */
95 		init_flag = 1;
96 	}
97 	if (init_flag == 1) {
98 		for (i = 0; i < RCAR_BL31_LOG_MAX; i += 4)
99 			*log_data++ = 0;
100 
101 		t_log->header.head = RCAR_LOG_HEAD;
102 		t_log->header.index = 0U;
103 		t_log->header.size = 0U;
104 	}
105 	rcar_lock_init();
106 
107 	return 1;
108 }
109