bootcount: Make bootcount magic configurable

Add new Kconfig option, SYS_BOOTCOUNT_MAGIC, to select the boot
counter magic word. This can be useful ie. in case the entire
boot counter register is not usable.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Tom Rini <trini@konsulko.com>

drivers/bootcount/Kconfig

@@ -127,4 +127,10 @@ config SYS_BOOTCOUNT_ADDR
 	help
 	  Set the address used for reading and writing the boot counter.
 
+config SYS_BOOTCOUNT_MAGIC
+	hex "Magic value for the boot counter"
+	default 0xB001C041
+	help
+	  Set the magic value used for the boot counter.
+
 endif

drivers/bootcount/bootcount.c

@@ -16,13 +16,13 @@ __weak void bootcount_store(ulong a)
 	uintptr_t flush_end;
 
 #if defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD)
-	raw_bootcount_store(reg, (BOOTCOUNT_MAGIC & 0xffff0000) | a);
+	raw_bootcount_store(reg, (CONFIG_SYS_BOOTCOUNT_MAGIC & 0xffff0000) | a);
 
 	flush_end = roundup(CONFIG_SYS_BOOTCOUNT_ADDR + 4,
 			    CONFIG_SYS_CACHELINE_SIZE);
 #else
 	raw_bootcount_store(reg, a);
-	raw_bootcount_store(reg + 4, BOOTCOUNT_MAGIC);
+	raw_bootcount_store(reg + 4, CONFIG_SYS_BOOTCOUNT_MAGIC);
 
 	flush_end = roundup(CONFIG_SYS_BOOTCOUNT_ADDR + 8,
 			    CONFIG_SYS_CACHELINE_SIZE);
@@ -37,12 +37,12 @@ __weak ulong bootcount_load(void)
 #if defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD)
 	u32 tmp = raw_bootcount_load(reg);
 
-	if ((tmp & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
+	if ((tmp & 0xffff0000) != (CONFIG_SYS_BOOTCOUNT_MAGIC & 0xffff0000))
 		return 0;
 	else
 		return (tmp & 0x0000ffff);
 #else
-	if (raw_bootcount_load(reg + 4) != BOOTCOUNT_MAGIC)
+	if (raw_bootcount_load(reg + 4) != CONFIG_SYS_BOOTCOUNT_MAGIC)
 		return 0;
 	else
 		return raw_bootcount_load(reg);

drivers/bootcount/bootcount_at91.c

@@ -6,15 +6,16 @@
 #include <asm/arch/at91_gpbr.h>
 
 /*
- * We combine the BOOTCOUNT_MAGIC and bootcount in one 32-bit register.
- * This is done so we need to use only one of the four GPBR registers.
+ * We combine the CONFIG_SYS_BOOTCOUNT_MAGIC and bootcount in one 32-bit
+ * register. This is done so we need to use only one of the four GPBR
+ * registers.
  */
 void bootcount_store(ulong a)
 {
 	at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR;
 
-	writel((BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff),
-		&gpbr->reg[AT91_GPBR_INDEX_BOOTCOUNT]);
+	writel((CONFIG_SYS_BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff),
+	       &gpbr->reg[AT91_GPBR_INDEX_BOOTCOUNT]);
 }
 
 ulong bootcount_load(void)
@@ -22,7 +23,7 @@ ulong bootcount_load(void)
 	at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR;
 
 	ulong val = readl(&gpbr->reg[AT91_GPBR_INDEX_BOOTCOUNT]);
-	if ((val & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
+	if ((val & 0xffff0000) != (CONFIG_SYS_BOOTCOUNT_MAGIC & 0xffff0000))
 		return 0;
 	else
 		return val & 0x0000ffff;

drivers/bootcount/bootcount_davinci.c

@@ -24,7 +24,7 @@ void bootcount_store(ulong a)
 	writel(RTC_KICK0R_WE, &reg->kick0r);
 	writel(RTC_KICK1R_WE, &reg->kick1r);
 	raw_bootcount_store(&reg->scratch2,
-			    (BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff));
+		(CONFIG_SYS_BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff));
 }
 
 ulong bootcount_load(void)
@@ -34,7 +34,7 @@ ulong bootcount_load(void)
 		(struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
 
 	val = raw_bootcount_load(&reg->scratch2);
-	if ((val & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
+	if ((val & 0xffff0000) != (CONFIG_SYS_BOOTCOUNT_MAGIC & 0xffff0000))
 		return 0;
 	else
 		return val & 0x0000ffff;

drivers/bootcount/bootcount_ram.c

@@ -28,7 +28,7 @@ void bootcount_store(ulong a)
 		size += gd->bd->bi_dram[i].size;
 	save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
 	writel(a, save_addr);
-	writel(BOOTCOUNT_MAGIC, &save_addr[1]);
+	writel(CONFIG_SYS_BOOTCOUNT_MAGIC, &save_addr[1]);
 
 	for (i = 0; i < REPEAT_PATTERN; i++)
 		writel(patterns[i % NBR_OF_PATTERNS],

include/common.h

@@ -385,7 +385,6 @@ uint	dpram_alloc(uint size);
 uint	dpram_alloc_align(uint size,uint align);
 void	bootcount_store (ulong);
 ulong	bootcount_load (void);
-#define BOOTCOUNT_MAGIC		0xB001C041
 
 /* $(CPU)/.../<eth> */
 void mii_init (void);