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/sysdev.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(struct sys_device *dev, pm_message_t state)
  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 int pxa3xx_smemc_resume(struct sys_device *dev)
  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         return 0;
  45 }
  46
  47 static struct sysdev_class smemc_sysclass = {
  48         .name           = "smemc",
  49         .suspend        = pxa3xx_smemc_suspend,
  50         .resume         = pxa3xx_smemc_resume,
  51 };
  52
  53 static struct sys_device smemc_sysdev = {
  54         .id             = 0,
  55         .cls            = &smemc_sysclass,
  56 };
  57
  58 static int __init smemc_init(void)
  59 {
  60         int ret = 0;
  61
  62         if (cpu_is_pxa3xx()) {
  63                 ret = sysdev_class_register(&smemc_sysclass);
  64                 if (ret)
  65                         return ret;
  66
  67                 ret = sysdev_register(&smemc_sysdev);
  68         }
  69
  70         return ret;
  71 }
  72 subsys_initcall(smemc_init);
  73 #endif