1 /*
2  * (C) Copyright 2010-2012
3  * Stefan Roese, DENX Software Engineering, sr@denx.de.
4  *
5  * SPDX-License-Identifier:	GPL-2.0+
6  */
7 
8 #include <bootcount.h>
9 #include <linux/compiler.h>
10 
11 /*
12  * Only override CONFIG_SYS_BOOTCOUNT_ADDR if not already defined. This
13  * way, some boards can define it directly in their config header.
14  */
15 #if !defined(CONFIG_SYS_BOOTCOUNT_ADDR)
16 
17 #if defined(CONFIG_QE)
18 #include <linux/immap_qe.h>
19 #define CONFIG_SYS_BOOTCOUNT_ADDR	(CONFIG_SYS_IMMR + 0x110000 + \
20 					 QE_MURAM_SIZE - 2 * sizeof(u32))
21 #endif /* defined(CONFIG_QE) */
22 
23 #endif /* !defined(CONFIG_SYS_BOOTCOUNT_ADDR) */
24 
25 /* Now implement the generic default functions */
26 #if defined(CONFIG_SYS_BOOTCOUNT_ADDR)
27 __weak void bootcount_store(ulong a)
28 {
29 	void *reg = (void *)CONFIG_SYS_BOOTCOUNT_ADDR;
30 
31 #if defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD)
32 	raw_bootcount_store(reg, (BOOTCOUNT_MAGIC & 0xffff0000) | a);
33 #else
34 	raw_bootcount_store(reg, a);
35 	raw_bootcount_store(reg + 4, BOOTCOUNT_MAGIC);
36 #endif /* defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD */
37 }
38 
39 __weak ulong bootcount_load(void)
40 {
41 	void *reg = (void *)CONFIG_SYS_BOOTCOUNT_ADDR;
42 
43 #if defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD)
44 	u32 tmp = raw_bootcount_load(reg);
45 
46 	if ((tmp & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
47 		return 0;
48 	else
49 		return (tmp & 0x0000ffff);
50 #else
51 	if (raw_bootcount_load(reg + 4) != BOOTCOUNT_MAGIC)
52 		return 0;
53 	else
54 		return raw_bootcount_load(reg);
55 #endif /* defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD) */
56 }
57 #endif /* defined(CONFIG_SYS_BOOTCOUNT_ADDR) */
58