[U-Boot] [PATCH v3 3/7] bootcount: Add function wrappers to handle bootcount increment and error checking

[Lukasz Majewski]

Those two functions can be used to provide easy bootcount management.

Signed-off-by: Lukasz Majewski <lukma at denx.de>

---

Changes in v4:
- Remove enum bootcount_context and replace it with checking gd_t->flags
  (The GD_FLG_SPL_INIT is only set in SPL, it is cleared in u-boot proper,
   so can be used as indication if we are in u-boot or SPL).
- Do not call bootcount_store() twice when it is not needed.
- Call env_set_ulong("bootcount", bootcount); only in NON SPL context -
  Boards with TINY_PRINTF (in newest mainline) will build break as this function
  requires simple_itoa() from vsprintf.c (now not always build in SPL).

Changes in v3:
- Unify those functions to also work with common/autoboot.c code
- Add enum bootcount_context to distinguish between u-boot proper and SPL

Changes in v2:
- None

 include/bootcount.h | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/include/bootcount.h b/include/bootcount.h
index e3b3f7028e..919735c19a 100644
--- a/include/bootcount.h
+++ b/include/bootcount.h
@@ -11,6 +11,8 @@
 #include <asm/io.h>
 #include <asm/byteorder.h>
 
+#if defined CONFIG_SPL_BOOTCOUNT_LIMIT || defined CONFIG_BOOTCOUNT_LIMIT
+
 #if !defined(CONFIG_SYS_BOOTCOUNT_LE) && !defined(CONFIG_SYS_BOOTCOUNT_BE)
 # if __BYTE_ORDER == __LITTLE_ENDIAN
 #  define CONFIG_SYS_BOOTCOUNT_LE
@@ -40,4 +42,49 @@ static inline u32 raw_bootcount_load(volatile u32 *addr)
 	return in_be32(addr);
 }
 #endif
+
+DECLARE_GLOBAL_DATA_PTR;
+static inline int bootcount_error(void)
+{
+	unsigned long bootcount = bootcount_load();
+	unsigned long bootlimit = env_get_ulong("bootlimit", 10, 0);
+
+	if (bootlimit && bootcount > bootlimit) {
+		printf("Warning: Bootlimit (%lu) exceeded.", bootlimit);
+		if (!(gd->flags & GD_FLG_SPL_INIT))
+			printf(" Using altbootcmd.");
+		printf("\n");
+
+		return 1;
+	}
+
+	return 0;
+}
+
+static inline void bootcount_inc(void)
+{
+	unsigned long bootcount = bootcount_load();
+
+	if (gd->flags & GD_FLG_SPL_INIT) {
+		bootcount_store(++bootcount);
+		return;
+	}
+
+#ifndef CONFIG_SPL_BUILD
+	/* Only increment bootcount when no bootcount support in SPL */
+#ifndef CONFIG_SPL_BOOTCOUNT_LIMIT
+	bootcount_store(++bootcount);
+#endif
+	env_set_ulong("bootcount", bootcount);
+#endif /* !CONFIG_SPL_BUILD */
+}
+
+#if defined CONFIG_SPL_BUILD && !defined CONFIG_SPL_BOOTCOUNT_LIMIT
+void bootcount_store(ulong a) {};
+ulong bootcount_load(void) { return 0; }
+#endif /* CONFIG_SPL_BUILD && !CONFIG_SPL_BOOTCOUNT_LIMIT */
+#else
+static inline int bootcount_error(void) { return 0; }
+static inline void bootcount_inc(void) {}
+#endif /* CONFIG_SPL_BOOTCOUNT_LIMIT || CONFIG_BOOTCOUNT_LIMIT */
 #endif /* _BOOTCOUNT_H__ */
-- 
2.11.0