i2c, bootcount: add support for bootcounter on i2c devices
add support for bootcounter on an i2c device. And add a
README for all bootcounter options.
Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/README b/README
index bfd89b0..f14364b 100644
--- a/README
+++ b/README
@@ -2855,6 +2855,26 @@
The signing part is build into mkimage regardless of this
option.
+- bootcount support:
+ CONFIG_BOOTCOUNT_LIMIT
+
+ This enables the bootcounter support, see:
+ http://www.denx.de/wiki/DULG/UBootBootCountLimit
+
+ CONFIG_AT91SAM9XE
+ enable special bootcounter support on at91sam9xe based boards.
+ CONFIG_BLACKFIN
+ enable special bootcounter support on blackfin based boards.
+ CONFIG_SOC_DA8XX
+ enable special bootcounter support on da850 based boards.
+ CONFIG_BOOTCOUNT_RAM
+ enable support for the bootcounter in RAM
+ CONFIG_BOOTCOUNT_I2C
+ enable support for the bootcounter on an i2c (like RTC) device.
+ CONFIG_SYS_I2C_RTC_ADDR = i2c chip address
+ CONFIG_SYS_BOOTCOUNT_ADDR = i2c addr which is used for
+ the bootcounter.
+ CONFIG_BOOTCOUNT_ALEN = address len
- Show boot progress:
CONFIG_SHOW_BOOT_PROGRESS
diff --git a/drivers/bootcount/Makefile b/drivers/bootcount/Makefile
index bed6971..6f1c419 100644
--- a/drivers/bootcount/Makefile
+++ b/drivers/bootcount/Makefile
@@ -9,3 +9,4 @@
obj-$(CONFIG_BOOTCOUNT_AM33XX) += bootcount_davinci.o
obj-$(CONFIG_BOOTCOUNT_RAM) += bootcount_ram.o
obj-$(CONFIG_BOOTCOUNT_ENV) += bootcount_env.o
+obj-$(CONFIG_BOOTCOUNT_I2C) += bootcount_i2c.o
diff --git a/drivers/bootcount/bootcount_i2c.c b/drivers/bootcount/bootcount_i2c.c
new file mode 100644
index 0000000..e27b168
--- /dev/null
+++ b/drivers/bootcount/bootcount_i2c.c
@@ -0,0 +1,44 @@
+/*
+ * (C) Copyright 2013
+ * Heiko Schocher, DENX Software Engineering, hs@denx.de.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <bootcount.h>
+#include <linux/compiler.h>
+#include <i2c.h>
+
+#define BC_MAGIC 0xbc
+
+void bootcount_store(ulong a)
+{
+ unsigned char buf[3];
+ int ret;
+
+ buf[0] = BC_MAGIC;
+ buf[1] = (a & 0xff);
+ ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, CONFIG_SYS_BOOTCOUNT_ADDR,
+ CONFIG_BOOTCOUNT_ALEN, buf, 2);
+ if (ret != 0)
+ puts("Error writing bootcount\n");
+}
+
+ulong bootcount_load(void)
+{
+ unsigned char buf[3];
+ int ret;
+
+ ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, CONFIG_SYS_BOOTCOUNT_ADDR,
+ CONFIG_BOOTCOUNT_ALEN, buf, 2);
+ if (ret != 0) {
+ puts("Error loading bootcount\n");
+ return 0;
+ }
+ if (buf[0] == BC_MAGIC)
+ return buf[1];
+
+ bootcount_store(0);
+
+ return 0;
+}