2007-04-25 Ray Xu <xr@trasin.net>

	* Makefile.am, configure.ac: Add lpc22xx support.
	* lpc22xx/clock/clockdrv.c, lpc22xx/include/lpc22xx.h,
	lpc22xx/irq/bsp_irq_asm.S, lpc22xx/timer/lpc_timer.h,
	lpc22xx/timer/timer.c: New (Initial submission).

1 files changed, 143 insertions, 0 deletions

diff --git a/c/src/lib/libcpu/arm/lpc22xx/clock/clockdrv.c b/c/src/lib/libcpu/arm/lpc22xx/clock/clockdrv.c
new file mode 100644
index 0000000000..58f7355fbc
--- /dev/null
+++ b/c/src/lib/libcpu/arm/lpc22xx/clock/clockdrv.c
@@ -0,0 +1,143 @@
+/*
+ *  LPC22XX clock specific using the System Timer
+ * set the Time0
+ *  This is hardware specific part of the clock driver. At the end of this
+ *  file, the generic part of the driver is #included.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *
+ *  clockdrv.c,v 1.1 2002/11/13 17:55:04 joel Exp
+*/
+#include <rtems.h>
+#include <bsp.h>
+#include <irq.h>
+#include <lpc22xx.h>
+#include <rtems/bspIo.h>  /* for printk */
+
+/* this is defined in ../../../shared/clockdrv_shell.c */
+rtems_isr Clock_isr(rtems_vector_number vector);
+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);
+
+/* Replace the first value with the clock's interrupt name. */
+rtems_irq_connect_data clock_isr_data = {LPC22xx_INTERRUPT_TIMER0,
+                                         (rtems_irq_hdl)Clock_isr,
+                                         clock_isr_on,
+                                         clock_isr_off,
+                                         clock_isr_is_on,
+                                         3,     /* unused for ARM cpus */
+                                         0 };   /* unused for ARM cpus */
+
+/* If you follow the code, this is never used, so any value 
+ * should work
+ */
+#define CLOCK_VECTOR 0
+
+
+
+ /*use the /shared/clockdrv_shell.c code template */
+
+/**
+ * When we get the clock interrupt
+ *    - clear the interrupt bit?
+ *    - restart the timer?
+ */
+#define Clock_driver_support_at_tick() \
+ do {							\
+	  if (!(T0IR & 0x01)) return; 	\
+	  T0IR = 0x01; 				\
+	  VICVectAddr = 0x00;\
+ } while(0)
+
+/**
+ * Installs the clock ISR. You shouldn't need to change this.
+ */
+#define Clock_driver_support_install_isr( _new, _old ) \
+  do {                                                 \
+      (_old) = NULL;                                   \
+      BSP_install_rtems_irq_handler(&clock_isr_data);  \
+  } while(0)
+
+
+/**
+ * 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 BSP_Configuration.microseconds_per_tick */
+  /* MR0/(LPC22xx_Fpclk/(PR0+1)) = 10/1000 = 0.01s */
+			
+	
+#define Clock_driver_support_initialize_hardware() \
+  do { \
+	T0TCR &= 0; 	 /* disable and clear timer 0, set to  */ \
+       T0PC  = 0;            /* TC is incrementet on every pclk.*/ \
+	T0MR0 = ((LPC22xx_Fpclk/1000* BSP_Configuration.microseconds_per_tick) / 1000); /* initialize the timer period and prescaler */  \
+	/*T0PR = (((LPC22xx_Fpclk / 1000) * BSP_Configuration.microseconds_per_tick) / 1000-1); \ */ \
+	T0MCR |= 0x03;		  /* generate interrupt when T0MR0 match T0TC and Reset Timer Count*/ \
+       T0EMR = 0;  /*No external match*/ \
+	T0TCR = 1; /*enable timer0*/ \
+   } 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;
+	//return;
+}
+
+/**
+ * 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;
+	//return;
+}
+
+/**
+ * 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*/
+}
+
+
+/* Make sure to include this, and only at the end of the file */
+#include "../../../../libbsp/shared/clockdrv_shell.c"
+