add support for LPC32xx

1 files changed, 121 insertions, 0 deletions

diff --git a/c/src/lib/libbsp/arm/shared/lpc/clock/lpc-clock-config.c b/c/src/lib/libbsp/arm/shared/lpc/clock/lpc-clock-config.c
new file mode 100644
index 0000000000..7dbb6c4b32
--- /dev/null
+++ b/c/src/lib/libbsp/arm/shared/lpc/clock/lpc-clock-config.c
@@ -0,0 +1,121 @@
+/**
+ * @file
+ *
+ * @ingroup lpc
+ *
+ * @brief Clock driver configuration.
+ */
+
+/*
+ * Copyright (c) 2009
+ * embedded brains GmbH
+ * Obere Lagerstr. 30
+ * D-82178 Puchheim
+ * Germany
+ * <rtems@embedded-brains.de>
+ *
+ * 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 <bsp/lpc-clock-config.h>
+#include <bsp/lpc-timer.h>
+
+/* This is defined in ../../../shared/clockdrv_shell.h */
+rtems_isr Clock_isr(rtems_vector_number vector);
+
+static volatile lpc_timer *const lpc_clock = 
+  (volatile lpc_timer *) LPC_CLOCK_TIMER_BASE;
+
+static void lpc_clock_at_tick(void)
+{
+  lpc_clock->ir = LPC_TIMER_IR_MR0;
+}
+
+static void lpc_clock_handler_install(void)
+{
+  rtems_status_code sc = RTEMS_SUCCESSFUL;
+
+  sc = rtems_interrupt_handler_install(
+    LPC_CLOCK_INTERRUPT,
+    "Clock",
+    RTEMS_INTERRUPT_UNIQUE,
+    (rtems_interrupt_handler) Clock_isr,
+    NULL
+  );
+  if (sc != RTEMS_SUCCESSFUL) {
+    rtems_fatal_error_occurred(0xdeadbeef);
+  }
+}
+
+static void lpc_clock_initialize(void)
+{
+  uint64_t interval = ((uint64_t) LPC_CLOCK_REFERENCE
+    * (uint64_t) rtems_configuration_get_microseconds_per_tick()) / 1000000;
+
+  /* Enable module */
+  LPC_CLOCK_MODULE_ENABLE();
+
+  /* Reset timer */
+  lpc_clock->tcr = LPC_TIMER_TCR_RST;
+
+  /* Clear interrupt flags */
+  lpc_clock->ir = LPC_TIMER_IR_ALL;
+
+  /* Set timer mode */
+  lpc_clock->ccr = 0;
+
+  /* Timer is incremented every PERIPH_CLK tick */
+  lpc_clock->pr = 0;
+
+  /* Set match registers */
+  lpc_clock->mr0 = (uint32_t) interval;
+
+  /* Generate interrupt and reset counter on match with MR0 */
+  lpc_clock->mcr = LPC_TIMER_MCR_MR0_INTR | LPC_TIMER_MCR_MR0_RST;
+
+  /* No external match */
+  lpc_clock->emr = 0x0;
+
+  /* Enable timer */
+  lpc_clock->tcr = LPC_TIMER_TCR_EN;
+}
+
+static void lpc_clock_cleanup(void)
+{
+  rtems_status_code sc = RTEMS_SUCCESSFUL;
+
+  /* Disable timer */
+  lpc_clock->tcr = 0x0;
+
+  /* Remove interrupt handler */
+  sc = rtems_interrupt_handler_remove(
+    LPC_CLOCK_INTERRUPT,
+    (rtems_interrupt_handler) Clock_isr,
+    NULL
+  );
+  if (sc != RTEMS_SUCCESSFUL) {
+    rtems_fatal_error_occurred(0xdeadbeef);
+  }
+}
+
+static uint32_t lpc_clock_nanoseconds_since_last_tick(void)
+{
+  uint64_t clock = LPC_CLOCK_REFERENCE;
+  uint64_t clicks = lpc_clock->tc;
+  uint64_t ns = (clicks * 1000000000) / clock;
+
+  return (uint32_t) ns;
+}
+
+#define Clock_driver_support_at_tick() lpc_clock_at_tick()
+#define Clock_driver_support_initialize_hardware() lpc_clock_initialize()
+#define Clock_driver_support_install_isr(isr, old_isr) \
+  lpc_clock_handler_install()
+#define Clock_driver_support_shutdown_hardware() lpc_clock_cleanup()
+#define Clock_driver_nanoseconds_since_last_tick \
+  lpc_clock_nanoseconds_since_last_tick
+
+/* Include shared source clock driver code */
+#include "../../../../shared/clockdrv_shell.h"