1 files changed, 111 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c64xx/irq-pm.c b/arch/arm/mach-s3c64xx/irq-pm.c
new file mode 100644
index 000000000000..da1bec64b9da
--- /dev/null
+++ b/arch/arm/mach-s3c64xx/irq-pm.c
@@ -0,0 +1,111 @@
+/* arch/arm/plat-s3c64xx/irq-pm.c
+ *
+ * Copyright 2008 Openmoko, Inc.
+ * Copyright 2008 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>
+ *      http://armlinux.simtec.co.uk/
+ *
+ * S3C64XX - Interrupt handling Power Management
+ *
+ * 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/kernel.h>
+#include <linux/sysdev.h>
+#include <linux/interrupt.h>
+#include <linux/serial_core.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <mach/map.h>
+
+#include <plat/regs-serial.h>
+#include <plat/regs-timer.h>
+#include <mach/regs-gpio.h>
+#include <plat/cpu.h>
+#include <plat/pm.h>
+
+/* We handled all the IRQ types in this code, to save having to make several
+ * small files to handle each different type separately. Having the EINT_GRP
+ * code here shouldn't be as much bloat as the IRQ table space needed when
+ * they are enabled. The added benefit is we ensure that these registers are
+ * in the same state as we suspended.
+ */
+
+static struct sleep_save irq_save[] = {
+        SAVE_ITEM(S3C64XX_PRIORITY),
+        SAVE_ITEM(S3C64XX_EINT0CON0),
+        SAVE_ITEM(S3C64XX_EINT0CON1),
+        SAVE_ITEM(S3C64XX_EINT0FLTCON0),
+        SAVE_ITEM(S3C64XX_EINT0FLTCON1),
+        SAVE_ITEM(S3C64XX_EINT0FLTCON2),
+        SAVE_ITEM(S3C64XX_EINT0FLTCON3),
+        SAVE_ITEM(S3C64XX_EINT0MASK),
+        SAVE_ITEM(S3C64XX_TINT_CSTAT),
+};
+
+static struct irq_grp_save {
+        u32     fltcon;
+        u32     con;
+        u32     mask;
+} eint_grp_save[5];
+
+static u32 irq_uart_mask[CONFIG_SERIAL_SAMSUNG_UARTS];
+
+static int s3c64xx_irq_pm_suspend(struct sys_device *dev, pm_message_t state)
+{
+        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(S3C64XX_EINT12CON + (i * 4));
+                grp->mask = __raw_readl(S3C64XX_EINT12MASK + (i * 4));
+                grp->fltcon = __raw_readl(S3C64XX_EINT12FLTCON + (i * 4));
+        }
+
+        return 0;
+}
+
+static int s3c64xx_irq_pm_resume(struct sys_device *dev)
+{
+        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, S3C64XX_EINT12CON + (i * 4));
+                __raw_writel(grp->mask, S3C64XX_EINT12MASK + (i * 4));
+                __raw_writel(grp->fltcon, S3C64XX_EINT12FLTCON + (i * 4));
+        }
+
+        S3C_PMDBG("%s: IRQ configuration restored\n", __func__);
+        return 0;
+}
+
+static struct sysdev_driver s3c64xx_irq_driver = {
+        .suspend = s3c64xx_irq_pm_suspend,
+        .resume  = s3c64xx_irq_pm_resume,
+};
+
+static int __init s3c64xx_irq_pm_init(void)
+{
+        return sysdev_driver_register(&s3c64xx_sysclass, &s3c64xx_irq_driver);
+}
+
+arch_initcall(s3c64xx_irq_pm_init);
+