ARM: OMAP: Add support for boot reason

Adds support for boot reason.

Signed-off-by: Juha Yrjola <juha.yrjola@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/mach-omap/Kconfig b/arch/arm/mach-omap/Kconfig
index 557e6132db49df0a4468312ffce9c10d72b1ea24..965bb989c7ca01fd0c603f1007fd47aec47cf69b 100644 (file)
--- a/arch/arm/mach-omap/Kconfig
+++ b/arch/arm/mach-omap/Kconfig
@@ -42,6 +42,14 @@ config OMAP_BOOT_TAG
           Say Y, if you have a bootloader which passes information
           about your board and its peripheral configuration.
 
+config OMAP_BOOT_REASON
+       bool "Support for boot reason"
+        depends on OMAP_BOOT_TAG
+        default n
+        help
+          Say Y, if you want to have a procfs entry for reading the boot
+          reason in user-space.
+
 config OMAP_MUX
        bool "OMAP multiplexing support"
         depends on ARCH_OMAP

diff --git a/arch/arm/mach-omap/Makefile b/arch/arm/mach-omap/Makefile
index e03bde3302f298126e3e0b6d709f9c966d1b6433..769437d5bf88e8e4b9bc06131a9462eea82d3124 100644 (file)
--- a/arch/arm/mach-omap/Makefile
+++ b/arch/arm/mach-omap/Makefile
@@ -19,3 +19,4 @@ obj-$(CONFIG_PM) += pm.o sleep.o
 
 obj-$(CONFIG_CPU_FREQ) += cpu-omap.o
 obj-$(CONFIG_OMAP_DM_TIMER) += dmtimer.o
+obj-$(CONFIG_OMAP_BOOT_REASON) += bootreason.o

diff --git a/arch/arm/mach-omap/bootreason.c b/arch/arm/mach-omap/bootreason.c
new file mode 100644 (file)
index 0000000..06b9db6
--- /dev/null
+++ b/arch/arm/mach-omap/bootreason.c
@@ -0,0 +1,80 @@
+/*
+ * linux/arch/arm/mach-omap/bootreason.c
+ *
+ * OMAP Bootreason passing
+ *
+ * Copyright (c) 2004 Nokia
+ *
+ * Written by David Weinehall <david.weinehall@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <linux/config.h>
+#include <linux/proc_fs.h>
+#include <linux/errno.h>
+#include <asm/arch/board.h>
+
+static char boot_reason[16];
+
+static int omap_bootreason_read_proc(char *page, char **start, off_t off,
+                                    int count, int *eof, void *data)
+{
+       int len = 0;
+
+       len += sprintf(page + len, "%s\n", boot_reason);
+
+       *start = page + off;
+
+       if (len > off)
+               len -= off;
+       else
+               len = 0;
+
+       return len < count ? len  : count;
+}
+
+static int __init bootreason_init(void)
+{
+       const struct omap_boot_reason_config *cfg;
+       int reason_valid = 0;
+       
+       cfg = omap_get_config(OMAP_TAG_BOOT_REASON, struct omap_boot_reason_config);
+       if (cfg != NULL) {
+               strncpy(boot_reason, cfg->reason_str, sizeof(cfg->reason_str));
+               boot_reason[sizeof(cfg->reason_str)] = 0;
+               reason_valid = 1;
+       } else {
+               /* Read the boot reason from the OMAP registers */
+       }
+
+       if (!reason_valid)
+               return -ENOENT;
+
+       printk(KERN_INFO "Bootup reason: %s\n", boot_reason);
+
+       if (!create_proc_read_entry("bootreason", S_IRUGO, NULL,
+                                   omap_bootreason_read_proc, NULL))
+               return -ENOMEM;
+
+       return 0;
+}
+
+late_initcall(bootreason_init);