diff --git a/arch/arm/mach-w90x900/cpu.c b/arch/arm/mach-w90x900/cpu.c
new file mode 100644
index 0000000..921cef9
--- /dev/null
+++ b/arch/arm/mach-w90x900/cpu.c
@@ -0,0 +1,212 @@
+/*
+ * linux/arch/arm/mach-w90x900/cpu.c
+ *
+ * Copyright (c) 2009 Nuvoton corporation.
+ *
+ * Wan ZongShun <mcuos.com@gmail.com>
+ *
+ * NUC900 series cpu common support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation;version 2 of the License.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/timer.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/serial_8250.h>
+#include <linux/delay.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+#include <asm/mach/irq.h>
+#include <asm/irq.h>
+
+#include <mach/hardware.h>
+#include <mach/regs-serial.h>
+#include <mach/regs-clock.h>
+#include <mach/regs-ebi.h>
+
+#include "cpu.h"
+#include "clock.h"
+
+/* Initial IO mappings */
+
+static struct map_desc nuc900_iodesc[] __initdata = {
+	IODESC_ENT(IRQ),
+	IODESC_ENT(GCR),
+	IODESC_ENT(UART),
+	IODESC_ENT(TIMER),
+	IODESC_ENT(EBI),
+};
+
+/* Initial clock declarations. */
+static DEFINE_CLK(lcd, 0);
+static DEFINE_CLK(audio, 1);
+static DEFINE_CLK(fmi, 4);
+static DEFINE_SUBCLK(ms, 0);
+static DEFINE_SUBCLK(sd, 1);
+static DEFINE_CLK(dmac, 5);
+static DEFINE_CLK(atapi, 6);
+static DEFINE_CLK(emc, 7);
+static DEFINE_SUBCLK(rmii, 2);
+static DEFINE_CLK(usbd, 8);
+static DEFINE_CLK(usbh, 9);
+static DEFINE_CLK(g2d, 10);;
+static DEFINE_CLK(pwm, 18);
+static DEFINE_CLK(ps2, 24);
+static DEFINE_CLK(kpi, 25);
+static DEFINE_CLK(wdt, 26);
+static DEFINE_CLK(gdma, 27);
+static DEFINE_CLK(adc, 28);
+static DEFINE_CLK(usi, 29);
+static DEFINE_CLK(ext, 0);
+
+static struct clk_lookup nuc900_clkregs[] = {
+	DEF_CLKLOOK(&clk_lcd, "nuc900-lcd", NULL),
+	DEF_CLKLOOK(&clk_audio, "nuc900-audio", NULL),
+	DEF_CLKLOOK(&clk_fmi, "nuc900-fmi", NULL),
+	DEF_CLKLOOK(&clk_ms, "nuc900-fmi", "MS"),
+	DEF_CLKLOOK(&clk_sd, "nuc900-fmi", "SD"),
+	DEF_CLKLOOK(&clk_dmac, "nuc900-dmac", NULL),
+	DEF_CLKLOOK(&clk_atapi, "nuc900-atapi", NULL),
+	DEF_CLKLOOK(&clk_emc, "nuc900-emc", NULL),
+	DEF_CLKLOOK(&clk_rmii, "nuc900-emc", "RMII"),
+	DEF_CLKLOOK(&clk_usbd, "nuc900-usbd", NULL),
+	DEF_CLKLOOK(&clk_usbh, "nuc900-usbh", NULL),
+	DEF_CLKLOOK(&clk_g2d, "nuc900-g2d", NULL),
+	DEF_CLKLOOK(&clk_pwm, "nuc900-pwm", NULL),
+	DEF_CLKLOOK(&clk_ps2, "nuc900-ps2", NULL),
+	DEF_CLKLOOK(&clk_kpi, "nuc900-kpi", NULL),
+	DEF_CLKLOOK(&clk_wdt, "nuc900-wdt", NULL),
+	DEF_CLKLOOK(&clk_gdma, "nuc900-gdma", NULL),
+	DEF_CLKLOOK(&clk_adc, "nuc900-adc", NULL),
+	DEF_CLKLOOK(&clk_usi, "nuc900-spi", NULL),
+	DEF_CLKLOOK(&clk_ext, NULL, "ext"),
+};
+
+/* Initial serial platform data */
+
+struct plat_serial8250_port nuc900_uart_data[] = {
+	NUC900_8250PORT(UART0),
+};
+
+struct platform_device nuc900_serial_device = {
+	.name			= "serial8250",
+	.id			= PLAT8250_DEV_PLATFORM,
+	.dev			= {
+		.platform_data	= nuc900_uart_data,
+	},
+};
+
+/*Set NUC900 series cpu frequence*/
+static int __init nuc900_set_clkval(unsigned int cpufreq)
+{
+	unsigned int pllclk, ahbclk, apbclk, val;
+
+	pllclk = 0;
+	ahbclk = 0;
+	apbclk = 0;
+
+	switch (cpufreq) {
+	case 66:
+		pllclk = PLL_66MHZ;
+		ahbclk = AHB_CPUCLK_1_1;
+		apbclk = APB_AHB_1_2;
+		break;
+
+	case 100:
+		pllclk = PLL_100MHZ;
+		ahbclk = AHB_CPUCLK_1_1;
+		apbclk = APB_AHB_1_2;
+		break;
+
+	case 120:
+		pllclk = PLL_120MHZ;
+		ahbclk = AHB_CPUCLK_1_2;
+		apbclk = APB_AHB_1_2;
+		break;
+
+	case 166:
+		pllclk = PLL_166MHZ;
+		ahbclk = AHB_CPUCLK_1_2;
+		apbclk = APB_AHB_1_2;
+		break;
+
+	case 200:
+		pllclk = PLL_200MHZ;
+		ahbclk = AHB_CPUCLK_1_2;
+		apbclk = APB_AHB_1_2;
+		break;
+	}
+
+	__raw_writel(pllclk, REG_PLLCON0);
+
+	val = __raw_readl(REG_CLKDIV);
+	val &= ~(0x03 << 24 | 0x03 << 26);
+	val |= (ahbclk << 24 | apbclk << 26);
+	__raw_writel(val, REG_CLKDIV);
+
+	return 	0;
+}
+static int __init nuc900_set_cpufreq(char *str)
+{
+	unsigned long cpufreq, val;
+
+	if (!*str)
+		return 0;
+
+	strict_strtoul(str, 0, &cpufreq);
+
+	nuc900_clock_source(NULL, "ext");
+
+	nuc900_set_clkval(cpufreq);
+
+	mdelay(1);
+
+	val = __raw_readl(REG_CKSKEW);
+	val &= ~0xff;
+	val |= DEFAULTSKEW;
+	__raw_writel(val, REG_CKSKEW);
+
+	nuc900_clock_source(NULL, "pll0");
+
+	return 1;
+}
+
+__setup("cpufreq=", nuc900_set_cpufreq);
+
+/*Init NUC900 evb io*/
+
+void __init nuc900_map_io(struct map_desc *mach_desc, int mach_size)
+{
+	unsigned long idcode = 0x0;
+
+	iotable_init(mach_desc, mach_size);
+	iotable_init(nuc900_iodesc, ARRAY_SIZE(nuc900_iodesc));
+
+	idcode = __raw_readl(NUC900PDID);
+	if (idcode == NUC910_CPUID)
+		printk(KERN_INFO "CPU type 0x%08lx is NUC910\n", idcode);
+	else if (idcode == NUC920_CPUID)
+		printk(KERN_INFO "CPU type 0x%08lx is NUC920\n", idcode);
+	else if (idcode == NUC950_CPUID)
+		printk(KERN_INFO "CPU type 0x%08lx is NUC950\n", idcode);
+	else if (idcode == NUC960_CPUID)
+		printk(KERN_INFO "CPU type 0x%08lx is NUC960\n", idcode);
+}
+
+/*Init NUC900 clock*/
+
+void __init nuc900_init_clocks(void)
+{
+	clks_register(nuc900_clkregs, ARRAY_SIZE(nuc900_clkregs));
+}
+