[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>

1 files changed, 68 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c2412/sleep.S b/arch/arm/mach-s3c2412/sleep.S
new file mode 100644
index 00000000000..db32cac4199
--- /dev/null
+++ b/arch/arm/mach-s3c2412/sleep.S
@@ -0,0 +1,68 @@
+/* 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