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>

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>
Heiko Schocher
1 parent 16c550274c
Showing 3 changed files with 65 additions and 0 deletions Side-by-side Diff
README
drivers/bootcount/Makefile
drivers/bootcount/bootcount_i2c.c
@@ -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
@@ -9,4 +9,5 @@
 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
+/*
+ * (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;
+}
...	...	@@ -2855,6 +2855,26 @@
2855	2855	The signing part is build into mkimage regardless of this
2856	2856	option.
2857	2857
	2858	+- bootcount support:
	2859	+ CONFIG_BOOTCOUNT_LIMIT
	2860	+
	2861	+ This enables the bootcounter support, see:
	2862	+ http://www.denx.de/wiki/DULG/UBootBootCountLimit
	2863	+
	2864	+ CONFIG_AT91SAM9XE
	2865	+ enable special bootcounter support on at91sam9xe based boards.
	2866	+ CONFIG_BLACKFIN
	2867	+ enable special bootcounter support on blackfin based boards.
	2868	+ CONFIG_SOC_DA8XX
	2869	+ enable special bootcounter support on da850 based boards.
	2870	+ CONFIG_BOOTCOUNT_RAM
	2871	+ enable support for the bootcounter in RAM
	2872	+ CONFIG_BOOTCOUNT_I2C
	2873	+ enable support for the bootcounter on an i2c (like RTC) device.
	2874	+ CONFIG_SYS_I2C_RTC_ADDR = i2c chip address
	2875	+ CONFIG_SYS_BOOTCOUNT_ADDR = i2c addr which is used for
	2876	+ the bootcounter.
	2877	+ CONFIG_BOOTCOUNT_ALEN = address len
2858	2878
2859	2879	- Show boot progress:
2860	2880	CONFIG_SHOW_BOOT_PROGRESS
...	...	@@ -9,4 +9,5 @@
9	9	obj-$(CONFIG_BOOTCOUNT_AM33XX) += bootcount_davinci.o
10	10	obj-$(CONFIG_BOOTCOUNT_RAM) += bootcount_ram.o
11	11	obj-$(CONFIG_BOOTCOUNT_ENV) += bootcount_env.o
	12	+obj-$(CONFIG_BOOTCOUNT_I2C) += bootcount_i2c.o
	1	+/*
	2	+ * (C) Copyright 2013
	3	+ * Heiko Schocher, DENX Software Engineering, hs@denx.de.
	4	+ *
	5	+ * SPDX-License-Identifier: GPL-2.0+
	6	+ */
	7	+
	8	+#include <bootcount.h>
	9	+#include <linux/compiler.h>
	10	+#include <i2c.h>
	11	+
	12	+#define BC_MAGIC 0xbc
	13	+
	14	+void bootcount_store(ulong a)
	15	+{
	16	+ unsigned char buf[3];
	17	+ int ret;
	18	+
	19	+ buf[0] = BC_MAGIC;
	20	+ buf[1] = (a & 0xff);
	21	+ ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, CONFIG_SYS_BOOTCOUNT_ADDR,
	22	+ CONFIG_BOOTCOUNT_ALEN, buf, 2);
	23	+ if (ret != 0)
	24	+ puts("Error writing bootcount\n");
	25	+}
	26	+
	27	+ulong bootcount_load(void)
	28	+{
	29	+ unsigned char buf[3];
	30	+ int ret;
	31	+
	32	+ ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, CONFIG_SYS_BOOTCOUNT_ADDR,
	33	+ CONFIG_BOOTCOUNT_ALEN, buf, 2);
	34	+ if (ret != 0) {
	35	+ puts("Error loading bootcount\n");
	36	+ return 0;
	37	+ }
	38	+ if (buf[0] == BC_MAGIC)
	39	+ return buf[1];
	40	+
	41	+ bootcount_store(0);
	42	+
	43	+ return 0;
	44	+}