[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>

diff --git a/arch/arm/mach-pxa/Makefile b/arch/arm/mach-pxa/Makefile
index b5c916c0747d68867b34325eebc576a86f5fad0b..8604938bd94897a78d40ca0b51ec6ee3e4587ccd 100644 (file)
--- a/arch/arm/mach-pxa/Makefile
+++ b/arch/arm/mach-pxa/Makefile
@@ -6,7 +6,7 @@
 obj-y                          += clock.o devices.o generic.o irq.o dma.o time.o
 obj-$(CONFIG_PXA25x)           += pxa25x.o
 obj-$(CONFIG_PXA27x)           += pxa27x.o
-obj-$(CONFIG_PXA3xx)           += pxa3xx.o mfp.o
+obj-$(CONFIG_PXA3xx)           += pxa3xx.o mfp.o smemc.o
 obj-$(CONFIG_CPU_PXA300)       += pxa300.o
 obj-$(CONFIG_CPU_PXA320)       += pxa320.o
 

diff --git a/arch/arm/mach-pxa/smemc.c b/arch/arm/mach-pxa/smemc.c
new file mode 100644 (file)
index 0000000..ad346ad
--- /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