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authoreric miao <eric.miao@marvell.com>2008-01-29 02:00:02 +0300
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-02-04 16:17:33 +0300
commitb1d907f9ccb3ffe1d7f5f04d2e9163de22ab01e6 (patch)
tree0b29cff47e1b9fc4b58b3e7b1eaadf416372c0f2 /arch/arm/mach-pxa/smemc.c
parentc4d1fb627ff307256d792280efcb09e1235affea (diff)
downloadlinux-b1d907f9ccb3ffe1d7f5f04d2e9163de22ab01e6.tar.xz
[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 <eric.miao@marvell.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-pxa/smemc.c')
-rw-r--r--arch/arm/mach-pxa/smemc.c88
1 files changed, 88 insertions, 0 deletions
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 <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/sysdev.h>
+
+#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