From c32b1efa43e31bd9a8a7eae3623664d00c34d842 Mon Sep 17 00:00:00 2001
From: Alan Cudmore <alan.cudmore@gmail.com>
Date: Sat, 23 Mar 2013 19:13:07 +0100
Subject: bsp/raspberrypi: New BSP

---
 c/src/lib/libbsp/arm/raspberrypi/clock/clockdrv.c | 91 +++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 c/src/lib/libbsp/arm/raspberrypi/clock/clockdrv.c

(limited to 'c/src/lib/libbsp/arm/raspberrypi/clock/clockdrv.c')

diff --git a/c/src/lib/libbsp/arm/raspberrypi/clock/clockdrv.c b/c/src/lib/libbsp/arm/raspberrypi/clock/clockdrv.c
new file mode 100644
index 0000000000..d50ae32d1e
--- /dev/null
+++ b/c/src/lib/libbsp/arm/raspberrypi/clock/clockdrv.c
@@ -0,0 +1,91 @@
+/*
+ * BCM2835 Clock driver
+ *
+ * Copyright (c) 2013 Alan Cudmore
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *
+ *  http://www.rtems.com/license/LICENSE
+ *
+*/
+
+#include <rtems.h>
+#include <bsp.h>
+#include <bsp/irq.h>
+#include <bsp/raspberrypi.h>
+
+/* This is defined in ../../../shared/clockdrv_shell.h */
+void Clock_isr(rtems_irq_hdl_param arg);
+
+static void raspberrypi_clock_at_tick(void)
+{
+   BCM2835_REG(BCM2835_TIMER_CLI) = 0;
+}
+
+static void raspberrypi_clock_handler_install(void)
+{
+  rtems_status_code sc = RTEMS_SUCCESSFUL;
+
+  sc = rtems_interrupt_handler_install(
+    BCM2835_IRQ_ID_TIMER_0,
+    "Clock",
+    RTEMS_INTERRUPT_UNIQUE,
+    (rtems_interrupt_handler) Clock_isr,
+    NULL
+  );
+  if (sc != RTEMS_SUCCESSFUL) {
+    rtems_fatal_error_occurred(0xdeadbeef);
+  }
+}
+
+static void raspberrypi_clock_initialize(void)
+{
+   BCM2835_REG(BCM2835_TIMER_CTL) = 0x003E0000;
+   BCM2835_REG(BCM2835_TIMER_LOD) = 10000 - 1;
+   BCM2835_REG(BCM2835_TIMER_RLD) = 10000 - 1;
+   BCM2835_REG(BCM2835_TIMER_DIV) = BCM2835_TIMER_PRESCALE;
+   BCM2835_REG(BCM2835_TIMER_CLI) = 0;
+   BCM2835_REG(BCM2835_TIMER_CTL) = 0x003E00A2;
+}
+
+static void raspberrypi_clock_cleanup(void)
+{
+  rtems_status_code sc = RTEMS_SUCCESSFUL;
+
+  /* Remove interrupt handler */
+  sc = rtems_interrupt_handler_remove(
+    BCM2835_IRQ_ID_TIMER_0,
+    (rtems_interrupt_handler) Clock_isr,
+    NULL
+  );
+  if (sc != RTEMS_SUCCESSFUL) {
+    rtems_fatal_error_occurred(0xdeadbeef);
+  }
+}
+
+/*
+ *  Return the nanoseconds since last tick
+ */
+static uint32_t raspberrypi_clock_nanoseconds_since_last_tick(void)
+{
+  return 0;
+}
+
+#define Clock_driver_support_at_tick() raspberrypi_clock_at_tick()
+
+#define Clock_driver_support_initialize_hardware() raspberrypi_clock_initialize()
+
+#define Clock_driver_support_install_isr(isr, old_isr) \
+  do {                                                 \
+    raspberrypi_clock_handler_install();               \
+    old_isr = NULL;                                    \
+  } while (0)
+
+#define Clock_driver_support_shutdown_hardware() raspberrypi_clock_cleanup()
+
+#define Clock_driver_nanoseconds_since_last_tick \
+  raspberrypi_clock_nanoseconds_since_last_tick
+
+
+#include "../../../shared/clockdrv_shell.h"
-- 
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