Index: bsps/arm/rtl22xx/clock/clockdrv.c
===================================================================
--- bsps/arm/rtl22xx/clock/clockdrv.c	(revision 7632906fc290b652416ab59eb5fb49356c064ed6)
+++ bsps/arm/rtl22xx/clock/clockdrv.c	(revision 7632906fc290b652416ab59eb5fb49356c064ed6)
@@ -0,0 +1,177 @@
+/*
+ *  LPC22XX/LPC21xx clock specific using the System Timer
+ *
+ *  Set the Time0 to generate click for RTEMS
+ */
+
+/*
+ *  Copyright (c) 2006 by Ray <rayx.cn@gmail.com>
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.org/license/LICENSE.
+ */
+
+#include <rtems.h>
+#include <bsp.h>
+#include <bsp/irq.h>
+#include <lpc22xx.h>
+#include <rtems/bspIo.h>  /* for printk */
+#include <rtems/timecounter.h>
+
+void Clock_isr(rtems_irq_hdl_param arg);
+static void clock_isr_on(const rtems_irq_connect_data *unused);
+static void clock_isr_off(const rtems_irq_connect_data *unused);
+static int clock_isr_is_on(const rtems_irq_connect_data *irq);
+
+static rtems_timecounter_simple lpc22xx_tc;
+
+static uint32_t lpc22xx_tc_get(rtems_timecounter_simple *tc)
+{
+  return T0TC;
+}
+
+static bool lpc22xx_tc_is_pending(rtems_timecounter_simple *tc)
+{
+  return (T0IR & 0x1) != 0;
+}
+
+static uint32_t lpc22xx_tc_get_timecount(struct timecounter *tc)
+{
+  return rtems_timecounter_simple_upcounter_get(
+    tc,
+    lpc22xx_tc_get,
+    lpc22xx_tc_is_pending
+  );
+}
+
+/**
+ * When we get the clock interrupt
+ *    - clear the interrupt bit?
+ *    - restart the timer?
+ */
+static void lpc22xx_tc_at_tick(rtems_timecounter_simple *tc)
+{
+  if (!(T0IR & 0x01))
+    return;
+  T0IR = 0x01;
+  VICVectAddr = 0x00;
+}
+
+static void lpc22xx_tc_tick(void)
+{
+  rtems_timecounter_simple_upcounter_tick(
+    &lpc22xx_tc,
+    lpc22xx_tc_get,
+    lpc22xx_tc_at_tick
+  );
+}
+
+/* Replace the first value with the clock's interrupt name. */
+rtems_irq_connect_data clock_isr_data = {
+  .name   = LPC22xx_INTERRUPT_TIMER0,
+  .hdl    = Clock_isr,
+  .handle = NULL,
+  .on     = clock_isr_on,
+  .off    = clock_isr_off,
+  .isOn   = clock_isr_is_on,
+};
+
+/* use the /shared/dev/clock/clockimpl.h code template */
+
+/**
+ * Installs the clock ISR. You shouldn't need to change this.
+ */
+#define Clock_driver_support_install_isr( _new ) \
+  BSP_install_rtems_irq_handler(&clock_isr_data)
+
+/**
+ * Initialize the hardware for the clock
+ *   - Set the frequency
+ *   - enable it
+ *   - clear any pending interrupts
+ *
+ * Since you may want the clock always running, you can
+ * enable interrupts here. If you do so, the clock_isr_on(),
+ * clock_isr_off(), and clock_isr_is_on() functions can be
+ * NOPs.
+ * 
+ * set timer to generate interrupt every
+ * rtems_configuration_get_microseconds_per_tick()
+ *     MR0/(LPC22xx_Fpclk/(PR0+1)) = 10/1000 = 0.01s
+ */
+#define Clock_driver_support_initialize_hardware() \
+  do { \
+    /* disable and clear timer 0, set to  */ \
+    T0TCR &= 0;                              \
+    /* TC is incremented on every pclk.*/    \
+    T0PC   = 0;                              \
+    /* initialize the timer period and prescaler */  \
+    T0MR0  = ((LPC22xx_Fpclk/1000 *          \
+             rtems_configuration_get_microseconds_per_tick()) / 1000); \
+    /* generate interrupt when T0MR0 match T0TC and Reset Timer Count*/ \
+    T0MCR |= 0x03;          \
+    /* No external match */ \
+    T0EMR = 0;              \
+    /* enable timer0 */     \
+    T0TCR = 1;              \
+    /* enable interrupt, skyeye will check this*/ \
+    T0IR |= 0x01; \
+    /* install timecounter */ \
+    rtems_timecounter_simple_install( \
+      &lpc22xx_tc, \
+      LPC22xx_Fpclk, \
+      T0MR0, \
+      lpc22xx_tc_get_timecount \
+    ); \
+  } while (0)
+
+/**
+ * Do whatever you need to shut the clock down and remove the
+ * interrupt handler. Since this normally only gets called on
+ * RTEMS shutdown, you may not need to do anything other than
+ * remove the ISR.
+ */
+#define Clock_driver_support_shutdown_hardware()                        \
+  do {                                                                  \
+    /* Disable timer */ \
+    T0TCR&=~0x02; \
+    BSP_remove_rtems_irq_handler(&clock_isr_data);                  \
+  } while (0)
+
+/**
+ * Enables clock interrupt.
+ *
+ * If the interrupt is always on, this can be a NOP.
+ */
+static void clock_isr_on(const rtems_irq_connect_data *unused)
+{
+  T0IR&=0x01;
+}
+
+/**
+ * Disables clock interrupts
+ *
+ * If the interrupt is always on, this can be a NOP.
+ */
+static void clock_isr_off(const rtems_irq_connect_data *unused)
+{
+  T0IR=0x00;
+}
+
+/**
+ * Tests to see if clock interrupt is enabled, and returns 1 if so.
+ * If interrupt is not enabled, returns 0.
+ *
+ * If the interrupt is always on, this always returns 1.
+ */
+static int clock_isr_is_on(const rtems_irq_connect_data *irq)
+{
+  return T0IR & 0x01;  /* MR0 mask */
+}
+
+#define Clock_driver_timecounter_tick() lpc22xx_tc_tick()
+
+/* Make sure to include this, and only at the end of the file */
+#include "../../../shared/dev/clock/clockimpl.h"
+
