ARM: SAMSUNG: Add support for interrupt wakeup-sources
Add support for wakeup-mask style interrupts that share a
single mask register for various different interrupts. This
registers a set of interrupt->bit mappings and the register
they belong to.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
diff --git a/arch/arm/plat-samsung/wakeup-mask.c b/arch/arm/plat-samsung/wakeup-mask.c
new file mode 100644
index 0000000..2e09b6a
--- /dev/null
+++ b/arch/arm/plat-samsung/wakeup-mask.c
@@ -0,0 +1,47 @@
+/* arch/arm/plat-samsung/wakeup-mask.c
+ *
+ * Copyright 2010 Ben Dooks <ben-linux@fluff.org>
+ *
+ * Support for wakeup mask interrupts on newer SoCs
+ *
+ * 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/spinlock.h>
+#include <linux/sysdev.h>
+#include <linux/types.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <plat/wakeup-mask.h>
+#include <plat/pm.h>
+
+void samsung_sync_wakemask(void __iomem *reg,
+ struct samsung_wakeup_mask *mask, int nr_mask)
+{
+ struct irq_desc *desc;
+ u32 val;
+
+ val = __raw_readl(reg);
+
+ for (; nr_mask > 0; nr_mask--, mask++) {
+ if (mask->irq == NO_WAKEUP_IRQ) {
+ val |= mask->bit;
+ continue;
+ }
+
+ desc = irq_to_desc(mask->irq);
+
+ /* bit of a liberty to read this directly from irq_desc. */
+ if (desc->wake_depth > 0)
+ val &= ~mask->bit;
+ else
+ val |= mask->bit;
+ }
+
+ printk(KERN_INFO "wakemask %08x => %08x\n", __raw_readl(reg), val);
+ __raw_writel(val, reg);
+}