--- linux-2.6.22.14/arch/mips/rb/rb100/oprofile.c	1970-01-01 03:00:00.000000000 +0300
+++ linux/arch/mips/rb/rb100/oprofile.c	2008-01-15 11:01:09.000000000 +0200
@@ -0,0 +1,57 @@
+#include <linux/interrupt.h>
+#include <linux/oprofile.h>
+
+#define IRQ_TIMER 0
+
+#define SWCTRL_BASE 0x12000000
+#define ADM5120_SW_REG(reg) \
+        (*((volatile unsigned *) (KSEG1ADDR(SWCTRL_BASE + (reg)))))
+
+#define SW_TIMER_INT		0x00f0
+#define SW_TIMER		0x00f4
+
+#define CYCLES 100000
+#define OPROFILE_FREQ (175000000 / CYCLES)
+
+extern void rb100_enable_beeper(int enable);
+
+static irqreturn_t rb100_oprofile_irq(int irq, void *p)
+{
+	oprofile_add_sample(get_irq_regs(), 0);
+
+	ADM5120_SW_REG(SW_TIMER) = (1 << 16) | (1562500 / OPROFILE_FREQ);
+	ADM5120_SW_REG(SW_TIMER_INT) = 1;
+
+	return IRQ_HANDLED;
+}
+
+static int rb100_oprofile_start(void)
+{
+	rb100_enable_beeper(0);
+	request_irq(IRQ_TIMER, rb100_oprofile_irq, 0, "oprofile", 0);
+
+	ADM5120_SW_REG(SW_TIMER) = (1 << 16) | (1562500 / OPROFILE_FREQ);
+	ADM5120_SW_REG(SW_TIMER_INT) = 1;
+
+	return 0;
+}
+
+static void rb100_oprofile_stop(void)
+{
+	ADM5120_SW_REG(SW_TIMER_INT) = 1 << 16;
+	ADM5120_SW_REG(SW_TIMER) = 0;
+
+	free_irq(IRQ_TIMER, 0);
+	rb100_enable_beeper(1);
+}
+
+int __init rb100_oprofile_init(struct oprofile_operations *ops)
+{
+	ops->create_files = NULL;
+	ops->setup = NULL;
+	ops->shutdown = NULL;
+	ops->start = rb100_oprofile_start;
+	ops->stop = rb100_oprofile_stop;
+	ops->cpu_type = "timer";
+	return 0;
+}