arch/arm/mach-pxa/smemc.c

   1 /*
   2  * Static Memory Controller
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/kernel.h>
   7 #include <linux/init.h>
   8 #include <linux/io.h>
   9 #include <linux/syscore_ops.h>
  10
  11 #include <mach/hardware.h>
  12 #include <mach/smemc.h>
  13
  14 #ifdef CONFIG_PM
  15 static unsigned long msc[2];
  16 static unsigned long sxcnfg, memclkcfg;
  17 static unsigned long csadrcfg[4];
  18
  19 static int pxa3xx_smemc_suspend(void)
  20 {
  21         msc[0] = __raw_readl(MSC0);
  22         msc[1] = __raw_readl(MSC1);
  23         sxcnfg = __raw_readl(SXCNFG);
  24         memclkcfg = __raw_readl(MEMCLKCFG);
  25         csadrcfg[0] = __raw_readl(CSADRCFG0);
  26         csadrcfg[1] = __raw_readl(CSADRCFG1);
  27         csadrcfg[2] = __raw_readl(CSADRCFG2);
  28         csadrcfg[3] = __raw_readl(CSADRCFG3);
  29
  30         return 0;
  31 }
  32
  33 static void pxa3xx_smemc_resume(void)
  34 {
  35         __raw_writel(msc[0], MSC0);
  36         __raw_writel(msc[1], MSC1);
  37         __raw_writel(sxcnfg, SXCNFG);
  38         __raw_writel(memclkcfg, MEMCLKCFG);
  39         __raw_writel(csadrcfg[0], CSADRCFG0);
  40         __raw_writel(csadrcfg[1], CSADRCFG1);
  41         __raw_writel(csadrcfg[2], CSADRCFG2);
  42         __raw_writel(csadrcfg[3], CSADRCFG3);
  43 }
  44
  45 static struct syscore_ops smemc_syscore_ops = {
  46         .suspend        = pxa3xx_smemc_suspend,
  47         .resume         = pxa3xx_smemc_resume,
  48 };
  49
  50 static int __init smemc_init(void)
  51 {
  52         if (cpu_is_pxa3xx())
  53                 register_syscore_ops(&smemc_syscore_ops);
  54
  55         return 0;
  56 }
  57 subsys_initcall(smemc_init);
  58 #endif