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authorBen Dooks <ben-linux@fluff.org>2007-12-23 03:09:34 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-01-28 13:20:50 +0000
commit332349518f1958b0bc1ae3febc2e4f75f214d255 (patch)
tree5bbf5aa0c1ab02dbee30fdf46d0043dfc52a5ce3 /arch/arm/mach-s3c2412/sleep.S
parent[ARM] 4730/1: S3C2412: Ensure the PWRCFG has the right mode for RTC wake (diff)
downloadlinux-dev-332349518f1958b0bc1ae3febc2e4f75f214d255.tar.xz
linux-dev-332349518f1958b0bc1ae3febc2e4f75f214d255.zip
[ARM] 4731/1: S3C2412: Check for incomplete sleep
Check if the sleep command returns due to a pending interrupt in the standby unit. If this happens, try and ack the IRQ before re-trying the resume. It is currently unclear whether the resume can be backed out of at this stage as this could cause a problem with level based interrupts. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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-rw-r--r--arch/arm/mach-s3c2412/sleep.S68
1 files changed, 68 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c2412/sleep.S b/arch/arm/mach-s3c2412/sleep.S
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+/* linux/arch/arm/mach-s3c2412/sleep.S
+ *
+ * Copyright (c) 2007 Simtec Electronics
+ * Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C2412 Power Manager low-level sleep support
+ *
+ * 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 program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/hardware.h>
+#include <asm/arch/map.h>
+
+#include <asm/arch/regs-irq.h>
+
+ .text
+
+ .global s3c2412_sleep_enter
+
+s3c2412_sleep_enter:
+ mov r0, #0 /* argument for coprocessors */
+ ldr r1, =S3C2410_INTPND
+ ldr r2, =S3C2410_SRCPND
+ ldr r3, =S3C2410_EINTPEND
+
+ teq r0, r0
+ bl s3c2412_sleep_enter1
+ teq pc, r0
+ bl s3c2412_sleep_enter1
+
+ .align 5
+
+ /* this is called twice, first with the Z flag to ensure that the
+ * instructions have been loaded into the cache, and the second
+ * time to try and suspend the system.
+ */
+s3c2412_sleep_enter1:
+ mcr p15, 0, r0, c7, c10, 4
+ mcrne p15, 0, r0, c7, c0, 4
+
+ /* if we return from here, it is because an interrupt was
+ * active when we tried to shutdown. Try and ack the IRQ and
+ * retry, as simply returning causes the system to lock.
+ */
+
+ ldrne r9, [ r1 ]
+ strne r9, [ r1 ]
+ ldrne r9, [ r2 ]
+ strne r9, [ r2 ]
+ ldrne r9, [ r3 ]
+ strne r9, [ r3 ]
+ bne s3c2412_sleep_enter1
+
+ mov pc, r14