ARM: S5PV210: Untie PM support from legacy code

This patch makes S5PV210 not rely on legacy suspend helpers in
plat-samsung and implements platform suspend logic locally, similarly to
Exynos.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

6 files changed, 141 insertions, 15 deletions

diff --git a/arch/arm/mach-s5pv210/Kconfig b/arch/arm/mach-s5pv210/Kconfig
index d6d0f9268935..ffc777dfa8a0 100644
--- a/arch/arm/mach-s5pv210/Kconfig
+++ b/arch/arm/mach-s5pv210/Kconfig
@@ -14,8 +14,6 @@ config CPU_S5PV210
         select ARM_AMBA
         select PL330_DMA if DMADEVICES
         select S5P_EXT_INT
-        select S5P_PM if PM
-        select S5P_SLEEP if PM
         help
           Enable S5PV210 CPU support
 
diff --git a/arch/arm/mach-s5pv210/Makefile b/arch/arm/mach-s5pv210/Makefile
index 83993fc87d87..5308225dfdee 100644
--- a/arch/arm/mach-s5pv210/Makefile
+++ b/arch/arm/mach-s5pv210/Makefile
@@ -12,7 +12,7 @@ obj-				:=
 
 # Core
 
-obj-$(CONFIG_PM)                += pm.o
+obj-$(CONFIG_PM_SLEEP)          += pm.o sleep.o
 
 # machine support
 
diff --git a/arch/arm/mach-s5pv210/common.h b/arch/arm/mach-s5pv210/common.h
index 0b694c798ad1..2ad387c1ecf0 100644
--- a/arch/arm/mach-s5pv210/common.h
+++ b/arch/arm/mach-s5pv210/common.h
@@ -12,5 +12,12 @@
 #ifndef __ARCH_ARM_MACH_S5PV210_COMMON_H
 #define __ARCH_ARM_MACH_S5PV210_COMMON_H
 
+#ifdef CONFIG_PM_SLEEP
+u32 exynos_get_eint_wake_mask(void);
+void s5pv210_cpu_resume(void);
+void s5pv210_pm_init(void);
+#else
+static inline void s5pv210_pm_init(void) {}
+#endif
 
 #endif /* __ARCH_ARM_MACH_S5PV210_COMMON_H */
diff --git a/arch/arm/mach-s5pv210/pm.c b/arch/arm/mach-s5pv210/pm.c
index 00d1523284da..123163dd2ab0 100644
--- a/arch/arm/mach-s5pv210/pm.c
+++ b/arch/arm/mach-s5pv210/pm.c
@@ -1,6 +1,6 @@
 /* linux/arch/arm/mach-s5pv210/pm.c
  *
- * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ * Copyright (c) 2010-2014 Samsung Electronics Co., Ltd.
  *              http://www.samsung.com
  *
  * S5PV210 - Power Management support
@@ -19,17 +19,28 @@
 #include <linux/syscore_ops.h>
 #include <linux/io.h>
 
-#include <plat/cpu.h>
-#include <plat/pm.h>
+#include <asm/cacheflush.h>
+#include <asm/suspend.h>
+
+#include <plat/pm-common.h>
 
-#include <mach/regs-irq.h>
 #include <mach/regs-clock.h>
 
+#include "common.h"
+
 static struct sleep_save s5pv210_core_save[] = {
         /* Clock ETC */
         SAVE_ITEM(S5P_MDNIE_SEL),
 };
 
+/*
+ * VIC wake-up support (TODO)
+ */
+static u32 s5pv210_irqwake_intmask = 0xffffffff;
+
+/*
+ * Suspend helpers.
+ */
 static int s5pv210_cpu_suspend(unsigned long arg)
 {
         unsigned long tmp;
@@ -54,8 +65,12 @@ static void s5pv210_pm_prepare(void)
 {
         unsigned int tmp;
 
+        /* Set wake-up mask registers */
+        __raw_writel(exynos_get_eint_wake_mask(), S5P_EINT_WAKEUP_MASK);
+        __raw_writel(s5pv210_irqwake_intmask, S5P_WAKEUP_MASK);
+
         /* ensure at least INFORM0 has the resume address */
-        __raw_writel(virt_to_phys(s3c_cpu_resume), S5P_INFORM0);
+        __raw_writel(virt_to_phys(s5pv210_cpu_resume), S5P_INFORM0);
 
         tmp = __raw_readl(S5P_SLEEP_CFG);
         tmp &= ~(S5P_SLEEP_CFG_OSC_EN | S5P_SLEEP_CFG_USBOSC_EN);
@@ -75,6 +90,70 @@ static void s5pv210_pm_prepare(void)
         s3c_pm_do_save(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
 }
 
+/*
+ * Suspend operations.
+ */
+static int s5pv210_suspend_enter(suspend_state_t state)
+{
+        int ret;
+
+        s3c_pm_debug_init();
+
+        S3C_PMDBG("%s: suspending the system...\n", __func__);
+
+        S3C_PMDBG("%s: wakeup masks: %08x,%08x\n", __func__,
+                        s5pv210_irqwake_intmask, exynos_get_eint_wake_mask());
+
+        if (s5pv210_irqwake_intmask == -1U
+            && exynos_get_eint_wake_mask() == -1U) {
+                pr_err("%s: No wake-up sources!\n", __func__);
+                pr_err("%s: Aborting sleep\n", __func__);
+                return -EINVAL;
+        }
+
+        s3c_pm_save_uarts();
+        s5pv210_pm_prepare();
+        flush_cache_all();
+        s3c_pm_check_store();
+
+        ret = cpu_suspend(0, s5pv210_cpu_suspend);
+        if (ret)
+                return ret;
+
+        s3c_pm_restore_uarts();
+
+        S3C_PMDBG("%s: wakeup stat: %08x\n", __func__,
+                        __raw_readl(S5P_WAKEUP_STAT));
+
+        s3c_pm_check_restore();
+
+        S3C_PMDBG("%s: resuming the system...\n", __func__);
+
+        return 0;
+}
+
+static int s5pv210_suspend_prepare(void)
+{
+        s3c_pm_check_prepare();
+
+        return 0;
+}
+
+static void s5pv210_suspend_finish(void)
+{
+        s3c_pm_check_cleanup();
+}
+
+static const struct platform_suspend_ops s5pv210_suspend_ops = {
+        .enter          = s5pv210_suspend_enter,
+        .prepare        = s5pv210_suspend_prepare,
+        .finish         = s5pv210_suspend_finish,
+        .valid          = suspend_valid_only_mem,
+};
+
+/*
+ * Syscore operations used to delay restore of certain registers.
+ */
 static void s5pv210_pm_resume(void)
 {
         u32 tmp;
@@ -91,13 +170,11 @@ static struct syscore_ops s5pv210_pm_syscore_ops = {
         .resume         = s5pv210_pm_resume,
 };
 
-static __init int s5pv210_pm_syscore_init(void)
+/*
+ * Initialization entry point.
+ */
+void __init s5pv210_pm_init(void)
 {
         register_syscore_ops(&s5pv210_pm_syscore_ops);
-
-        pm_cpu_prep = s5pv210_pm_prepare;
-        pm_cpu_sleep = s5pv210_cpu_suspend;
-
-        return 0;
+        suspend_set_ops(&s5pv210_suspend_ops);
 }
-arch_initcall(s5pv210_pm_syscore_init);
diff --git a/arch/arm/mach-s5pv210/s5pv210.c b/arch/arm/mach-s5pv210/s5pv210.c
index c244ccb6b236..35db1ce9e11c 100644
--- a/arch/arm/mach-s5pv210/s5pv210.c
+++ b/arch/arm/mach-s5pv210/s5pv210.c
@@ -20,6 +20,8 @@
 #include <plat/map-base.h>
 #include <mach/regs-clock.h>
 
+#include "common.h"
+
 static int __init s5pv210_fdt_map_sys(unsigned long node, const char *uname,
                                         int depth, void *data)
 {
@@ -55,6 +57,11 @@ static void s5pv210_dt_restart(enum reboot_mode mode, const char *cmd)
         __raw_writel(0x1, S5P_SWRESET);
 }
 
+static void __init s5pv210_dt_init_late(void)
+{
+        s5pv210_pm_init();
+}
+
 static char const *s5pv210_dt_compat[] __initconst = {
         "samsung,s5pc110",
         "samsung,s5pv210",
@@ -65,4 +72,5 @@ DT_MACHINE_START(S5PV210_DT, "Samsung S5PC110/S5PV210-based board")
         .dt_compat = s5pv210_dt_compat,
         .map_io = s5pv210_dt_map_io,
         .restart = s5pv210_dt_restart,
+        .init_late = s5pv210_dt_init_late,
 MACHINE_END
diff --git a/arch/arm/mach-s5pv210/sleep.S b/arch/arm/mach-s5pv210/sleep.S
new file mode 100644
index 000000000000..7c43ddd33ba8
--- /dev/null
+++ b/arch/arm/mach-s5pv210/sleep.S
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2011-2014 Samsung Electronics Co., Ltd.
+ *              http://www.samsung.com
+ *
+ * S5PV210 Sleep Code
+ * Based on S3C64XX sleep code by:
+ *      Ben Dooks, (c) 2008 Simtec Electronics
+ *
+ * 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.
+ */
+
+#include <linux/linkage.h>
+
+        .data
+        .align
+
+        /*
+         * 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
+         */
+
+ENTRY(s5pv210_cpu_resume)
+        b       cpu_resume
+ENDPROC(s5pv210_cpu_resume)