LXR linux/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
  15static unsigned long msc[2];
  16static unsigned long sxcnfg, memclkcfg;
  17static unsigned long csadrcfg[4];
  18
  19static 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
  33static 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
  47static struct sysdev_class smemc_sysclass = {
  48        .name           = "smemc",
  49        .suspend        = pxa3xx_smemc_suspend,
  50        .resume         = pxa3xx_smemc_resume,
  51};
  52
  53static struct sys_device smemc_sysdev = {
  54        .id             = 0,
  55        .cls            = &smemc_sysclass,
  56};
  57
  58static 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}
  72subsys_initcall(smemc_init);
  73#endif
  74