ARM: S5PV210: Add Power Management Support

This patch adds suspend-to-ram support for S5PV210.
Note. This patch is confirmed on SMDKV210 and SMDKC110 board.

Signed-off-by: Jongpill Lee <boyko.lee@samsung.com>
Signed-off-by: Sangbeom Kim <sbkim73@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/mach-s5pv210/Kconfig

@@ -13,6 +13,7 @@ config CPU_S5PV210
 	bool
 	select S3C_PL330_DMA
 	select S5P_EXT_INT
+	select S5PV210_PM if PM
 	help
 	  Enable S5PV210 CPU support
 
@@ -152,4 +153,9 @@ config MACH_TORBRECK
 
 endmenu
 
+config S5PV210_PM
+	bool
+	help
+	  Power Management code common to S5PV210
+
 endif

arch/arm/mach-s5pv210/Makefile

@@ -14,6 +14,7 @@ obj-				:=
 
 obj-$(CONFIG_CPU_S5PV210)	+= cpu.o init.o clock.o dma.o gpiolib.o
 obj-$(CONFIG_CPU_S5PV210)	+= setup-i2c0.o
+obj-$(CONFIG_S5PV210_PM)	+= pm.o sleep.o
 
 # machine support
 

arch/arm/mach-s5pv210/include/mach/pm-core.h

@@ -0,0 +1,43 @@
+/* linux/arch/arm/mach-s5pv210/include/mach/pm-core.h
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * Based on arch/arm/mach-s3c2410/include/mach/pm-core.h,
+ * Copyright 2008 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>
+ *      http://armlinux.simtec.co.uk/
+ *
+ * S5PV210 - PM core support for arch/arm/plat-s5p/pm.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+static inline void s3c_pm_debug_init_uart(void)
+{
+	/* nothing here yet */
+}
+
+static inline void s3c_pm_arch_prepare_irqs(void)
+{
+	__raw_writel(s3c_irqwake_intmask, S5P_WAKEUP_MASK);
+	__raw_writel(s3c_irqwake_eintmask, S5P_EINT_WAKEUP_MASK);
+}
+
+static inline void s3c_pm_arch_stop_clocks(void)
+{
+	/* nothing here yet */
+}
+
+static inline void s3c_pm_arch_show_resume_irqs(void)
+{
+	/* nothing here yet */
+}
+
+static inline void s3c_pm_arch_update_uart(void __iomem *regs,
+					   struct pm_uart_save *save)
+{
+	/* nothing here yet */
+}

arch/arm/mach-s5pv210/include/mach/regs-clock.h

@@ -95,7 +95,7 @@
 /* Registers related to power management */
 #define S5P_PWR_CFG		S5P_CLKREG(0xC000)
 #define S5P_EINT_WAKEUP_MASK	S5P_CLKREG(0xC004)
-#define S5P_WAKEUP_MASK 	S5P_CLKREG(0xC008)
+#define S5P_WAKEUP_MASK		S5P_CLKREG(0xC008)
 #define S5P_PWR_MODE		S5P_CLKREG(0xC00C)
 #define S5P_NORMAL_CFG		S5P_CLKREG(0xC010)
 #define S5P_IDLE_CFG		S5P_CLKREG(0xC020)
@@ -159,8 +159,11 @@
 #define S5P_SLEEP_CFG_USBOSC_EN		(1 << 1)
 
 /* OTHERS Resgister */
+#define S5P_OTHERS_RET_IO		(1 << 31)
+#define S5P_OTHERS_RET_CF		(1 << 30)
+#define S5P_OTHERS_RET_MMC		(1 << 29)
+#define S5P_OTHERS_RET_UART		(1 << 28)
 #define S5P_OTHERS_USB_SIG_MASK		(1 << 16)
-#define S5P_OTHERS_MIPI_DPHY_EN		(1 << 28)
 
 /* MIPI */
 #define S5P_MIPI_DPHY_EN		(3)

arch/arm/mach-s5pv210/mach-smdkc110.c

@@ -28,6 +28,7 @@
 #include <plat/cpu.h>
 #include <plat/ata.h>
 #include <plat/iic.h>
+#include <plat/pm.h>
 
 /* Following are default values for UCON, ULCON and UFCON UART registers */
 #define SMDKC110_UCON_DEFAULT	(S3C2410_UCON_TXILEVEL |	\
@@ -110,6 +111,8 @@ static void __init smdkc110_map_io(void)
 
 static void __init smdkc110_machine_init(void)
 {
+	s3c_pm_init();
+
 	s3c_i2c0_set_platdata(NULL);
 	s3c_i2c1_set_platdata(NULL);
 	s3c_i2c2_set_platdata(NULL);

arch/arm/mach-s5pv210/mach-smdkv210.c

@@ -31,6 +31,7 @@
 #include <plat/ata.h>
 #include <plat/iic.h>
 #include <plat/keypad.h>
+#include <plat/pm.h>
 
 /* Following are default values for UCON, ULCON and UFCON UART registers */
 #define SMDKV210_UCON_DEFAULT	(S3C2410_UCON_TXILEVEL |	\
@@ -145,6 +146,8 @@ static void __init smdkv210_map_io(void)
 
 static void __init smdkv210_machine_init(void)
 {
+	s3c_pm_init();
+
 	samsung_keypad_set_platdata(&smdkv210_keypad_data);
 	s3c24xx_ts_set_platdata(&s3c_ts_platform);
 

arch/arm/mach-s5pv210/pm.c

@@ -0,0 +1,166 @@
+/* linux/arch/arm/mach-s5pv210/pm.c
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * S5PV210 - Power Management support
+ *
+ * Based on arch/arm/mach-s3c2410/pm.c
+ * Copyright (c) 2006 Simtec Electronics
+ *	Ben Dooks <ben@simtec.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/init.h>
+#include <linux/suspend.h>
+#include <linux/io.h>
+
+#include <plat/cpu.h>
+#include <plat/pm.h>
+#include <plat/regs-timer.h>
+
+#include <mach/regs-irq.h>
+#include <mach/regs-clock.h>
+
+static struct sleep_save s5pv210_core_save[] = {
+	/* Clock source */
+	SAVE_ITEM(S5P_CLK_SRC0),
+	SAVE_ITEM(S5P_CLK_SRC1),
+	SAVE_ITEM(S5P_CLK_SRC2),
+	SAVE_ITEM(S5P_CLK_SRC3),
+	SAVE_ITEM(S5P_CLK_SRC4),
+	SAVE_ITEM(S5P_CLK_SRC5),
+	SAVE_ITEM(S5P_CLK_SRC6),
+
+	/* Clock source Mask */
+	SAVE_ITEM(S5P_CLK_SRC_MASK0),
+	SAVE_ITEM(S5P_CLK_SRC_MASK1),
+
+	/* Clock Divider */
+	SAVE_ITEM(S5P_CLK_DIV0),
+	SAVE_ITEM(S5P_CLK_DIV1),
+	SAVE_ITEM(S5P_CLK_DIV2),
+	SAVE_ITEM(S5P_CLK_DIV3),
+	SAVE_ITEM(S5P_CLK_DIV4),
+	SAVE_ITEM(S5P_CLK_DIV5),
+	SAVE_ITEM(S5P_CLK_DIV6),
+	SAVE_ITEM(S5P_CLK_DIV7),
+
+	/* Clock Main Gate */
+	SAVE_ITEM(S5P_CLKGATE_MAIN0),
+	SAVE_ITEM(S5P_CLKGATE_MAIN1),
+	SAVE_ITEM(S5P_CLKGATE_MAIN2),
+
+	/* Clock source Peri Gate */
+	SAVE_ITEM(S5P_CLKGATE_PERI0),
+	SAVE_ITEM(S5P_CLKGATE_PERI1),
+
+	/* Clock source SCLK Gate */
+	SAVE_ITEM(S5P_CLKGATE_SCLK0),
+	SAVE_ITEM(S5P_CLKGATE_SCLK1),
+
+	/* Clock IP Clock gate */
+	SAVE_ITEM(S5P_CLKGATE_IP0),
+	SAVE_ITEM(S5P_CLKGATE_IP1),
+	SAVE_ITEM(S5P_CLKGATE_IP2),
+	SAVE_ITEM(S5P_CLKGATE_IP3),
+	SAVE_ITEM(S5P_CLKGATE_IP4),
+
+	/* Clock Blcok and Bus gate */
+	SAVE_ITEM(S5P_CLKGATE_BLOCK),
+	SAVE_ITEM(S5P_CLKGATE_BUS0),
+
+	/* Clock ETC */
+	SAVE_ITEM(S5P_CLK_OUT),
+	SAVE_ITEM(S5P_MDNIE_SEL),
+
+	/* PWM Register */
+	SAVE_ITEM(S3C2410_TCFG0),
+	SAVE_ITEM(S3C2410_TCFG1),
+	SAVE_ITEM(S3C64XX_TINT_CSTAT),
+	SAVE_ITEM(S3C2410_TCON),
+	SAVE_ITEM(S3C2410_TCNTB(0)),
+	SAVE_ITEM(S3C2410_TCMPB(0)),
+	SAVE_ITEM(S3C2410_TCNTO(0)),
+};
+
+void s5pv210_cpu_suspend(void)
+{
+	unsigned long tmp;
+
+	/* issue the standby signal into the pm unit. Note, we
+	 * issue a write-buffer drain just in case */
+
+	tmp = 0;
+
+	asm("b 1f\n\t"
+	    ".align 5\n\t"
+	    "1:\n\t"
+	    "mcr p15, 0, %0, c7, c10, 5\n\t"
+	    "mcr p15, 0, %0, c7, c10, 4\n\t"
+	    "wfi" : : "r" (tmp));
+
+	/* we should never get past here */
+	panic("sleep resumed to originator?");
+}
+
+static void s5pv210_pm_prepare(void)
+{
+	unsigned int tmp;
+
+	/* ensure at least INFORM0 has the resume address */
+	__raw_writel(virt_to_phys(s3c_cpu_resume), S5P_INFORM0);
+
+	tmp = __raw_readl(S5P_SLEEP_CFG);
+	tmp &= ~(S5P_SLEEP_CFG_OSC_EN | S5P_SLEEP_CFG_USBOSC_EN);
+	__raw_writel(tmp, S5P_SLEEP_CFG);
+
+	/* WFI for SLEEP mode configuration by SYSCON */
+	tmp = __raw_readl(S5P_PWR_CFG);
+	tmp &= S5P_CFG_WFI_CLEAN;
+	tmp |= S5P_CFG_WFI_SLEEP;
+	__raw_writel(tmp, S5P_PWR_CFG);
+
+	/* SYSCON interrupt handling disable */
+	tmp = __raw_readl(S5P_OTHERS);
+	tmp |= S5P_OTHER_SYSC_INTOFF;
+	__raw_writel(tmp, S5P_OTHERS);
+
+	s3c_pm_do_save(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
+}
+
+static int s5pv210_pm_add(struct sys_device *sysdev)
+{
+	pm_cpu_prep = s5pv210_pm_prepare;
+	pm_cpu_sleep = s5pv210_cpu_suspend;
+
+	return 0;
+}
+
+static int s5pv210_pm_resume(struct sys_device *dev)
+{
+	u32 tmp;
+
+	tmp = __raw_readl(S5P_OTHERS);
+	tmp |= (S5P_OTHERS_RET_IO | S5P_OTHERS_RET_CF |\
+		S5P_OTHERS_RET_MMC | S5P_OTHERS_RET_UART);
+	__raw_writel(tmp , S5P_OTHERS);
+
+	s3c_pm_do_restore_core(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
+
+	return 0;
+}
+
+static struct sysdev_driver s5pv210_pm_driver = {
+	.add		= s5pv210_pm_add,
+	.resume		= s5pv210_pm_resume,
+};
+
+static __init int s5pv210_pm_drvinit(void)
+{
+	return sysdev_driver_register(&s5pv210_sysclass, &s5pv210_pm_driver);
+}
+arch_initcall(s5pv210_pm_drvinit);

arch/arm/mach-s5pv210/sleep.S

@@ -0,0 +1,170 @@
+/* linux/arch/arm/plat-s5p/sleep.S
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * S5PV210 power Manager (Suspend-To-RAM) support
+ * Based on S3C2410 sleep code by:
+ * 	Ben Dooks, (c) 2004 Simtec Electronics
+ *
+ * Based on PXA/SA1100 sleep code by:
+ *	Nicolas Pitre, (c) 2002 Monta Vista Software Inc
+ *	Cliff Brake, (c) 2001
+ *
+ * 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/memory.h>
+
+	.text
+
+	/* s3c_cpu_save
+	 *
+	 * entry:
+	 *	r0 = save address (virtual addr of s3c_sleep_save_phys)
+	*/
+
+ENTRY(s3c_cpu_save)
+
+	stmfd	sp!, { r3 - r12, lr }
+
+	mrc	p15, 0, r4, c13, c0, 0	@ FCSE/PID
+	mrc	p15, 0, r5, c3, c0, 0	@ Domain ID
+	mrc	p15, 0, r6, c2, c0, 0	@ Translation Table BASE0
+	mrc	p15, 0, r7, c2, c0, 1	@ Translation Table BASE1
+	mrc	p15, 0, r8, c2, c0, 2	@ Translation Table Control
+	mrc	p15, 0, r9, c1, c0, 0	@ Control register
+	mrc	p15, 0, r10, c1, c0, 1	@ Auxiliary control register
+	mrc	p15, 0, r11, c1, c0, 2	@ Co-processor access controls
+	mrc	p15, 0, r12, c10, c2, 0	@ Read PRRR
+	mrc	p15, 0, r3, c10, c2, 1	@ READ NMRR
+
+	stmia	r0, { r3 - r13 }
+
+	bl	s3c_pm_cb_flushcache
+
+	ldr	r0, =pm_cpu_sleep
+	ldr	r0, [ r0 ]
+	mov	pc, r0
+
+resume_with_mmu:
+	/*
+	 * After MMU is turned on, restore the previous MMU table.
+	 */
+	ldr	r9 , =(PAGE_OFFSET - PHYS_OFFSET)
+	add	r4, r4, r9
+	str	r12, [r4]
+
+	ldmfd	sp!, { r3 - r12, pc }
+
+	.ltorg
+
+	.data
+
+	.global	s3c_sleep_save_phys
+s3c_sleep_save_phys:
+	.word	0
+
+	/* sleep magic, to allow the bootloader to check for an valid
+	 * image to resume to. Must be the first word before the
+	 * s3c_cpu_resume entry.
+	*/
+
+	.word	0x2bedf00d
+
+	/* s3c_cpu_resume
+	 *
+	 * resume code entry for bootloader to call
+	 *
+	 * we must put this code here in the data segment as we have no
+	 * other way of restoring the stack pointer after sleep, and we
+	 * must not write to the code segment (code is read-only)
+	*/
+
+ENTRY(s3c_cpu_resume)
+	mov	r0, #PSR_I_BIT | PSR_F_BIT | SVC_MODE
+	msr	cpsr_c, r0
+
+	mov	r1, #0
+	mcr	p15, 0, r1, c8, c7, 0		@ invalidate TLBs
+	mcr	p15, 0, r1, c7, c5, 0		@ invalidate I Cache
+
+	ldr	r0, s3c_sleep_save_phys		@ address of restore block
+	ldmia	r0, { r3 - r13 }
+
+	mcr	p15, 0, r4, c13, c0, 0		@ FCSE/PID
+	mcr	p15, 0, r5, c3, c0, 0		@ Domain ID
+
+	mcr	p15, 0, r8, c2, c0, 2		@ Translation Table Control
+	mcr	p15, 0, r7, c2, c0, 1		@ Translation Table BASE1
+	mcr	p15, 0, r6, c2, c0, 0		@ Translation Table BASE0
+
+	mcr	p15, 0, r10, c1, c0, 1		@ Auxiliary control register
+
+	mov	r0, #0
+	mcr	p15, 0, r0, c8, c7, 0		@ Invalidate I & D TLB
+
+	mov	r0, #0				@ restore copro access
+	mcr	p15, 0, r11, c1, c0, 2		@ Co-processor access
+	mcr 	p15, 0, r0, c7, c5, 4
+
+	mcr	p15, 0, r12, c10, c2, 0		@ write PRRR
+	mcr	p15, 0, r3, c10, c2, 1		@ write NMRR
+
+	/*
+	 * In Cortex-A8, when MMU is turned on, the pipeline is flushed.
+	 * And there are no valid entries in the MMU table at this point.
+	 * So before turning on the MMU, the MMU entry for the DRAM address
+	 * range is added. After the MMU is turned on, the other entries
+	 * in the MMU table will be restored.
+	*/
+
+	/* r6 = Translation Table BASE0 */
+	mov	r4, r6
+	mov	r4, r4, LSR #14
+	mov	r4, r4, LSL #14
+
+	/* Load address for adding to MMU table list */
+	ldr	r11, =0xE010F000		@ INFORM0 reg.
+	ldr	r10, [r11, #0]
+	mov	r10, r10, LSR #18
+	bic	r10, r10, #0x3
+	orr	r4, r4, r10
+
+	/* Calculate MMU table entry */
+	mov 	r10, r10, LSL #18
+	ldr	r5, =0x40E
+	orr	r10, r10, r5
+
+	/* Back up originally data */
+	ldr	r12, [r4]
+
+	/* Add calculated MMU table entry into MMU table list */
+	str	r10, [r4]
+
+	ldr	r2, =resume_with_mmu
+	mcr	p15, 0, r9, c1, c0, 0		@ turn on MMU, etc
+
+	nop
+	nop
+	nop
+	nop
+	nop					@ second-to-last before mmu
+
+	mov	pc, r2				@ go back to virtual address
+
+	.ltorg

arch/arm/plat-s5p/Makefile

@@ -19,6 +19,8 @@ obj-y				+= clock.o
 obj-y				+= irq.o
 obj-$(CONFIG_S5P_EXT_INT)	+= irq-eint.o
 obj-$(CONFIG_S5P_GPIO_INT)	+= irq-gpioint.o
+obj-$(CONFIG_PM)		+= pm.o
+obj-$(CONFIG_PM)		+= irq-pm.o
 
 # devices
 

arch/arm/plat-s5p/irq-pm.c

@@ -0,0 +1,93 @@
+/* linux/arch/arm/plat-s5p/irq-pm.c
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * Based on arch/arm/plat-s3c24xx/irq-pm.c,
+ * Copyright (c) 2003,2004 Simtec Electronics
+ *	Ben Dooks <ben@simtec.co.uk>
+ *	http://armlinux.simtec.co.uk/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/sysdev.h>
+
+#include <plat/cpu.h>
+#include <plat/irqs.h>
+#include <plat/pm.h>
+#include <mach/map.h>
+
+#include <mach/regs-gpio.h>
+#include <mach/regs-irq.h>
+
+/* state for IRQs over sleep */
+
+/* default is to allow for EINT0..EINT31, and IRQ_RTC_TIC, IRQ_RTC_ALARM,
+ * as wakeup sources
+ *
+ * set bit to 1 in allow bitfield to enable the wakeup settings on it
+*/
+
+unsigned long s3c_irqwake_intallow	= 0x00000006L;
+unsigned long s3c_irqwake_eintallow	= 0xffffffffL;
+
+int s3c_irq_wake(unsigned int irqno, unsigned int state)
+{
+	unsigned long irqbit;
+
+	switch (irqno) {
+	case IRQ_RTC_TIC:
+	case IRQ_RTC_ALARM:
+		irqbit = 1 << (irqno + 1 - IRQ_RTC_ALARM);
+		if (!state)
+			s3c_irqwake_intmask |= irqbit;
+		else
+			s3c_irqwake_intmask &= ~irqbit;
+		break;
+	default:
+		return -ENOENT;
+	}
+	return 0;
+}
+
+static struct sleep_save eint_save[] = {
+	SAVE_ITEM(S5P_EINT_CON(0)),
+	SAVE_ITEM(S5P_EINT_CON(1)),
+	SAVE_ITEM(S5P_EINT_CON(2)),
+	SAVE_ITEM(S5P_EINT_CON(3)),
+
+	SAVE_ITEM(S5P_EINT_FLTCON(0)),
+	SAVE_ITEM(S5P_EINT_FLTCON(1)),
+	SAVE_ITEM(S5P_EINT_FLTCON(2)),
+	SAVE_ITEM(S5P_EINT_FLTCON(3)),
+	SAVE_ITEM(S5P_EINT_FLTCON(4)),
+	SAVE_ITEM(S5P_EINT_FLTCON(5)),
+	SAVE_ITEM(S5P_EINT_FLTCON(6)),
+	SAVE_ITEM(S5P_EINT_FLTCON(7)),
+
+	SAVE_ITEM(S5P_EINT_MASK(0)),
+	SAVE_ITEM(S5P_EINT_MASK(1)),
+	SAVE_ITEM(S5P_EINT_MASK(2)),
+	SAVE_ITEM(S5P_EINT_MASK(3)),
+};
+
+int s3c24xx_irq_suspend(struct sys_device *dev, pm_message_t state)
+{
+	s3c_pm_do_save(eint_save, ARRAY_SIZE(eint_save));
+
+	return 0;
+}
+
+int s3c24xx_irq_resume(struct sys_device *dev)
+{
+	s3c_pm_do_restore(eint_save, ARRAY_SIZE(eint_save));
+
+	return 0;
+}
+

arch/arm/plat-s5p/pm.c

@@ -0,0 +1,52 @@
+/* linux/arch/arm/plat-s5p/pm.c
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * S5P Power Manager (Suspend-To-RAM) support
+ *
+ * Based on arch/arm/plat-s3c24xx/pm.c
+ * Copyright (c) 2004,2006 Simtec Electronics
+ *	Ben Dooks <ben@simtec.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/suspend.h>
+#include <plat/pm.h>
+
+#define PFX "s5p pm: "
+
+/* s3c_pm_check_resume_pin
+ *
+ * check to see if the pin is configured correctly for sleep mode, and
+ * make any necessary adjustments if it is not
+*/
+
+static void s3c_pm_check_resume_pin(unsigned int pin, unsigned int irqoffs)
+{
+	/* nothing here yet */
+}
+
+/* s3c_pm_configure_extint
+ *
+ * configure all external interrupt pins
+*/
+
+void s3c_pm_configure_extint(void)
+{
+	/* nothing here yet */
+}
+
+void s3c_pm_restore_core(void)
+{
+	/* nothing here yet */
+}
+
+void s3c_pm_save_core(void)
+{
+	/* nothing here yet */
+}
+

arch/arm/plat-samsung/pm-gpio.c

@@ -192,7 +192,7 @@ struct s3c_gpio_pm s3c_gpio_pm_2bit = {
 	.resume = s3c_gpio_pm_2bit_resume,
 };
 
-#ifdef CONFIG_ARCH_S3C64XX
+#if defined(CONFIG_ARCH_S3C64XX) || defined(CONFIG_PLAT_S5P)
 static void s3c_gpio_pm_4bit_save(struct s3c_gpio_chip *chip)
 {
 	chip->pm_save[1] = __raw_readl(chip->base + OFFS_CON);
@@ -302,7 +302,7 @@ struct s3c_gpio_pm s3c_gpio_pm_4bit = {
 	.save	= s3c_gpio_pm_4bit_save,
 	.resume = s3c_gpio_pm_4bit_resume,
 };
-#endif /* CONFIG_ARCH_S3C64XX */
+#endif /* CONFIG_ARCH_S3C64XX || CONFIG_PLAT_S5P */
 
 /**
  * s3c_pm_save_gpio() - save gpio chip data for suspend