From b1d907f9ccb3ffe1d7f5f04d2e9163de22ab01e6 Mon Sep 17 00:00:00 2001 From: eric miao Date: Mon, 28 Jan 2008 23:00:02 +0000 Subject: [ARM] pxa: introduce sysdev for pxa3xx static memory controller Introduce a sysdev for pxa3xx static memory controller, mainly for register saving/restoring in PM Signed-off-by: eric miao Signed-off-by: Russell King --- arch/arm/mach-pxa/smemc.c | 88 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 88 insertions(+) create mode 100644 arch/arm/mach-pxa/smemc.c (limited to 'arch/arm/mach-pxa/smemc.c') diff --git a/arch/arm/mach-pxa/smemc.c b/arch/arm/mach-pxa/smemc.c new file mode 100644 index 000000000000..ad346addc028 --- /dev/null +++ b/arch/arm/mach-pxa/smemc.c @@ -0,0 +1,88 @@ +/* + * Static Memory Controller + */ + +#include +#include +#include +#include +#include + +#define SMEMC_PHYS_BASE (0x4A000000) +#define SMEMC_PHYS_SIZE (0x90) + +#define MSC0 (0x08) /* Static Memory Controller Register 0 */ +#define MSC1 (0x0C) /* Static Memory Controller Register 1 */ +#define SXCNFG (0x1C) /* Synchronous Static Memory Control Register */ +#define MEMCLKCFG (0x68) /* Clock Configuration */ +#define CSADRCFG0 (0x80) /* Address Configuration Register for CS0 */ +#define CSADRCFG1 (0x84) /* Address Configuration Register for CS1 */ +#define CSADRCFG2 (0x88) /* Address Configuration Register for CS2 */ +#define CSADRCFG3 (0x8C) /* Address Configuration Register for CS3 */ + +#ifdef CONFIG_PM +static void __iomem *smemc_mmio_base; + +static unsigned long msc[2]; +static unsigned long sxcnfg, memclkcfg; +static unsigned long csadrcfg[4]; + +static int pxa3xx_smemc_suspend(struct sys_device *dev, pm_message_t state) +{ + msc[0] = __raw_readl(smemc_mmio_base + MSC0); + msc[1] = __raw_readl(smemc_mmio_base + MSC1); + sxcnfg = __raw_readl(smemc_mmio_base + SXCNFG); + memclkcfg = __raw_readl(smemc_mmio_base + MEMCLKCFG); + csadrcfg[0] = __raw_readl(smemc_mmio_base + CSADRCFG0); + csadrcfg[1] = __raw_readl(smemc_mmio_base + CSADRCFG1); + csadrcfg[2] = __raw_readl(smemc_mmio_base + CSADRCFG2); + csadrcfg[3] = __raw_readl(smemc_mmio_base + CSADRCFG3); + + return 0; +} + +static int pxa3xx_smemc_resume(struct sys_device *dev) +{ + __raw_writel(msc[0], smemc_mmio_base + MSC0); + __raw_writel(msc[1], smemc_mmio_base + MSC1); + __raw_writel(sxcnfg, smemc_mmio_base + SXCNFG); + __raw_writel(memclkcfg, smemc_mmio_base + MEMCLKCFG); + __raw_writel(csadrcfg[0], smemc_mmio_base + CSADRCFG0); + __raw_writel(csadrcfg[1], smemc_mmio_base + CSADRCFG1); + __raw_writel(csadrcfg[2], smemc_mmio_base + CSADRCFG2); + __raw_writel(csadrcfg[3], smemc_mmio_base + CSADRCFG3); + + return 0; +} + +static struct sysdev_class smemc_sysclass = { + .name = "smemc", + .suspend = pxa3xx_smemc_suspend, + .resume = pxa3xx_smemc_resume, +}; + +static struct sys_device smemc_sysdev = { + .id = 0, + .cls = &smemc_sysclass, +}; + +static int __init smemc_init(void) +{ + int ret = 0; + + if (cpu_is_pxa3xx()) { + smemc_mmio_base = ioremap(SMEMC_PHYS_BASE, SMEMC_PHYS_SIZE); + if (smemc_mmio_base == NULL) + return -ENODEV; + + ret = sysdev_class_register(&smemc_sysclass); + if (ret) + return ret; + + ret = sysdev_register(&smemc_sysdev); + } + + return ret; +} +subsys_initcall(smemc_init); +#endif -- cgit v1.2.3