[ARM] 3986/1: H1940: suspend to RAM support

Add support to suspend and resume, using the
H1940's bootloader

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

4 files changed, 55 insertions, 2 deletions

diff --git a/arch/arm/mach-s3c2410/Makefile b/arch/arm/mach-s3c2410/Makefile
index d66013365b6..0cd71dfec44 100644
--- a/arch/arm/mach-s3c2410/Makefile
+++ b/arch/arm/mach-s3c2410/Makefile
@@ -77,7 +77,7 @@ obj-$(CONFIG_MACH_AML_M5900)	+= mach-amlm5900.o
 obj-$(CONFIG_MACH_ANUBIS)	+= mach-anubis.o
 obj-$(CONFIG_MACH_OSIRIS)	+= mach-osiris.o
 obj-$(CONFIG_ARCH_BAST)		+= mach-bast.o usb-simtec.o
-obj-$(CONFIG_ARCH_H1940)	+= mach-h1940.o
+obj-$(CONFIG_ARCH_H1940)	+= mach-h1940.o pm-h1940.o
 obj-$(CONFIG_MACH_N30)		+= mach-n30.o
 obj-$(CONFIG_ARCH_SMDK2410)	+= mach-smdk2410.o
 obj-$(CONFIG_MACH_SMDK2413)	+= mach-smdk2413.o
diff --git a/arch/arm/mach-s3c2410/mach-h1940.c b/arch/arm/mach-s3c2410/mach-h1940.c
index 8c895c077d2..f5b98099a5d 100644
--- a/arch/arm/mach-s3c2410/mach-h1940.c
+++ b/arch/arm/mach-s3c2410/mach-h1940.c
@@ -33,6 +33,7 @@
 #include <asm/arch/regs-serial.h>
 #include <asm/arch/regs-lcd.h>
 
+#include <asm/arch/h1940.h>
 #include <asm/arch/h1940-latch.h>
 #include <asm/arch/fb.h>
 
@@ -41,6 +42,7 @@
 #include "clock.h"
 #include "devs.h"
 #include "cpu.h"
+#include "pm.h"
 
 static struct map_desc h1940_iodesc[] __initdata = {
 	[0] = {
@@ -164,12 +166,16 @@ static void __init h1940_map_io(void)
 	s3c24xx_init_clocks(0);
 	s3c24xx_init_uarts(h1940_uartcfgs, ARRAY_SIZE(h1940_uartcfgs));
 	s3c24xx_set_board(&h1940_board);
+
+	/* setup PM */
+
+	memcpy(phys_to_virt(H1940_SUSPEND_RESUMEAT), h1940_pm_return, 1024);
+	s3c2410_pm_init();
 }
 
 static void __init h1940_init_irq(void)
 {
 	s3c24xx_init_irq();
-
 }
 
 static void __init h1940_init(void)
diff --git a/arch/arm/mach-s3c2410/pm-h1940.S b/arch/arm/mach-s3c2410/pm-h1940.S
new file mode 100644
index 00000000000..7d66de7ff7d
--- /dev/null
+++ b/arch/arm/mach-s3c2410/pm-h1940.S
@@ -0,0 +1,33 @@
+/* linux/arch/arm/mach-s3c2410/pm-h1940.S
+ *
+ * Copyright (c) 2006 Ben Dooks <ben-linux@fluff.org>
+ *
+ * H1940 Suspend to RAM
+ *
+ * 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
+ *
+ * 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-gpio.h>
+
+	.text
+	.global	h1940_pm_return
+
+h1940_pm_return:
+	mov	r0, #S3C2410_PA_GPIO
+	ldr	pc, [ r0, #S3C2410_GSTATUS3 - S3C24XX_VA_GPIO ]
diff --git a/arch/arm/mach-s3c2410/s3c2410-pm.c b/arch/arm/mach-s3c2410/s3c2410-pm.c
index e51d7666951..9cd0c104f1c 100644
--- a/arch/arm/mach-s3c2410/s3c2410-pm.c
+++ b/arch/arm/mach-s3c2410/s3c2410-pm.c
@@ -32,6 +32,7 @@
 #include <asm/mach-types.h>
 
 #include <asm/arch/regs-gpio.h>
+#include <asm/arch/h1940.h>
 
 #include "cpu.h"
 #include "pm.h"
@@ -52,6 +53,19 @@ static void s3c2410_pm_prepare(void)
 	DBG("GSTATUS3 0x%08x\n", __raw_readl(S3C2410_GSTATUS3));
 	DBG("GSTATUS4 0x%08x\n", __raw_readl(S3C2410_GSTATUS4));
 
+	if (machine_is_h1940()) {
+		void *base = phys_to_virt(H1940_SUSPEND_CHECK);
+		unsigned long ptr;
+		unsigned long calc = 0;
+
+		/* generate check for the bootloader to check on resume */
+
+		for (ptr = 0; ptr < 0x40000; ptr += 0x400)
+			calc += __raw_readl(base+ptr);
+
+		__raw_writel(calc, phys_to_virt(H1940_SUSPEND_CHECKSUM));
+	}
+
 	if ( machine_is_aml_m5900() )
 		s3c2410_gpio_setpin(S3C2410_GPF2, 1);