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>

1 files changed, 166 insertions, 0 deletions

diff --git a/arch/arm/mach-s5pv210/pm.c b/arch/arm/mach-s5pv210/pm.c
new file mode 100644
index 000000000000..549d7924fd4c
--- /dev/null
+++ b/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);