ARM: S5P64X0: Add Power Management support

Add suspend-to-ram support for SMDK6440/50

Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

1 files changed, 92 insertions, 0 deletions

diff --git a/arch/arm/mach-s5p64x0/irq-pm.c b/arch/arm/mach-s5p64x0/irq-pm.c
new file mode 100644
index 000000000000..3e6f2456ee9d
--- /dev/null
+++ b/arch/arm/mach-s5p64x0/irq-pm.c
@@ -0,0 +1,92 @@
+/* linux/arch/arm/mach-s5p64x0/irq-pm.c
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ *              http://www.samsung.com
+ *
+ * S5P64X0 - Interrupt handling Power Management
+ *
+ * Based on arch/arm/mach-s3c64xx/irq-pm.c by Ben Dooks
+ *
+ * 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/syscore_ops.h>
+#include <linux/serial_core.h>
+#include <linux/io.h>
+
+#include <plat/regs-serial.h>
+#include <plat/pm.h>
+
+#include <mach/regs-gpio.h>
+
+static struct sleep_save irq_save[] = {
+        SAVE_ITEM(S5P64X0_EINT0CON0),
+        SAVE_ITEM(S5P64X0_EINT0FLTCON0),
+        SAVE_ITEM(S5P64X0_EINT0FLTCON1),
+        SAVE_ITEM(S5P64X0_EINT0MASK),
+};
+
+static struct irq_grp_save {
+        u32     con;
+        u32     fltcon;
+        u32     mask;
+} eint_grp_save[4];
+
+static u32 irq_uart_mask[CONFIG_SERIAL_SAMSUNG_UARTS];
+
+static int s5p64x0_irq_pm_suspend(void)
+{
+        struct irq_grp_save *grp = eint_grp_save;
+        int i;
+
+        S3C_PMDBG("%s: suspending IRQs\n", __func__);
+
+        s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
+
+        for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++)
+                irq_uart_mask[i] = __raw_readl(S3C_VA_UARTx(i) + S3C64XX_UINTM);
+
+        for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
+                grp->con = __raw_readl(S5P64X0_EINT12CON + (i * 4));
+                grp->mask = __raw_readl(S5P64X0_EINT12MASK + (i * 4));
+                grp->fltcon = __raw_readl(S5P64X0_EINT12FLTCON + (i * 4));
+        }
+
+        return 0;
+}
+
+static void s5p64x0_irq_pm_resume(void)
+{
+        struct irq_grp_save *grp = eint_grp_save;
+        int i;
+
+        S3C_PMDBG("%s: resuming IRQs\n", __func__);
+
+        s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
+
+        for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++)
+                __raw_writel(irq_uart_mask[i], S3C_VA_UARTx(i) + S3C64XX_UINTM);
+
+        for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
+                __raw_writel(grp->con, S5P64X0_EINT12CON + (i * 4));
+                __raw_writel(grp->mask, S5P64X0_EINT12MASK + (i * 4));
+                __raw_writel(grp->fltcon, S5P64X0_EINT12FLTCON + (i * 4));
+        }
+
+        S3C_PMDBG("%s: IRQ configuration restored\n", __func__);
+}
+
+static struct syscore_ops s5p64x0_irq_syscore_ops = {
+        .suspend = s5p64x0_irq_pm_suspend,
+        .resume  = s5p64x0_irq_pm_resume,
+};
+
+static int __init s5p64x0_syscore_init(void)
+{
+        register_syscore_ops(&s5p64x0_irq_syscore_ops);
+
+        return 0;
+}
+core_initcall(s5p64x0_syscore_init);