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>

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

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

arch/arm/mach-omap/bootreason.c

+/*
+ * 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);