release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/plat-samsung/wakeup-mask.c

   1 /* arch/arm/plat-samsung/wakeup-mask.c
   2  *
   3  * Copyright 2010 Ben Dooks <ben-linux@fluff.org>
   4  *
   5  * Support for wakeup mask interrupts on newer SoCs
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10 */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/sysdev.h>
  15 #include <linux/types.h>
  16 #include <linux/irq.h>
  17 #include <linux/io.h>
  18
  19 #include <plat/wakeup-mask.h>
  20 #include <plat/pm.h>
  21
  22 void samsung_sync_wakemask(void __iomem *reg,
  23                            struct samsung_wakeup_mask *mask, int nr_mask)
  24 {
  25         struct irq_desc *desc;
  26         u32 val;
  27
  28         val = __raw_readl(reg);
  29
  30         for (; nr_mask > 0; nr_mask--, mask++) {
  31                 if (mask->irq == NO_WAKEUP_IRQ) {
  32                         val |= mask->bit;
  33                         continue;
  34                 }
  35
  36                 desc = irq_to_desc(mask->irq);
  37
  38                 /* bit of a liberty to read this directly from irq_desc. */
  39                 if (desc->wake_depth > 0)
  40                         val &= ~mask->bit;
  41                 else
  42                         val |= mask->bit;
  43         }
  44
  45         printk(KERN_INFO "wakemask %08x => %08x\n", __raw_readl(reg), val);
  46         __raw_writel(val, reg);
  47 }