bsps: Move clock drivers to bsps

This patch is a part of the BSP source reorganization.

Update #3285.

1 files changed, 131 insertions, 0 deletions

diff --git a/bsps/riscv/riscv_generic/clock/clockdrv.c b/bsps/riscv/riscv_generic/clock/clockdrv.c
new file mode 100644
index 0000000000..8ae50f9657
--- /dev/null
+++ b/bsps/riscv/riscv_generic/clock/clockdrv.c
@@ -0,0 +1,131 @@
+/**
+ * @file
+ *
+ * @ingroup bsp_clock
+ *
+ * @brief riscv clock support.
+ */
+
+/*
+ * riscv_generic Clock driver
+ *
+ * COPYRIGHT (c) 2015 Hesham Alatary <hesham@alumni.york.ac.uk>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <rtems.h>
+#include <bsp.h>
+#include <bsp/irq.h>
+#include <rtems/score/riscv-utility.h>
+#include <rtems/score/cpu.h>
+#include <rtems/timecounter.h>
+
+/* The number of clock cycles before generating a tick timer interrupt. */
+#define TTMR_NUM_OF_CLOCK_TICKS_INTERRUPT     1000
+#define RISCV_CLOCK_CYCLE_TIME_NANOSECONDS    1
+
+static struct timecounter riscv_generic_tc;
+
+/* CPU counter */
+static CPU_Counter_ticks cpu_counter_ticks;
+
+/* This prototype is added here to Avoid warnings */
+void Clock_isr(void *arg);
+
+static void riscv_generic_clock_at_tick(void)
+{
+  REG(MTIME_MM) = 0;
+  REG(MTIMECMP_MM) = TTMR_NUM_OF_CLOCK_TICKS_INTERRUPT;
+
+  cpu_counter_ticks += TTMR_NUM_OF_CLOCK_TICKS_INTERRUPT * 10000;
+}
+
+static void riscv_generic_clock_handler_install(proc_ptr new_isr)
+{
+  rtems_status_code sc = RTEMS_SUCCESSFUL;
+  _CPU_ISR_install_vector(RISCV_MACHINE_TIMER_INTERRUPT,
+                          new_isr,
+                          NULL);
+
+  if (sc != RTEMS_SUCCESSFUL) {
+    rtems_fatal_error_occurred(0xdeadbeef);
+  }
+}
+
+static uint32_t riscv_generic_get_timecount(struct timecounter *tc)
+{
+  uint32_t ticks_since_last_timer_interrupt = REG(MTIME_MM);
+
+  return cpu_counter_ticks + ticks_since_last_timer_interrupt;
+}
+
+CPU_Counter_ticks _CPU_Counter_read(void)
+{
+  return riscv_generic_get_timecount(NULL);
+}
+
+static void riscv_generic_clock_initialize(void)
+{
+  uint32_t mtimecmp = TTMR_NUM_OF_CLOCK_TICKS_INTERRUPT;
+  uint64_t frequency = (1000000000 / RISCV_CLOCK_CYCLE_TIME_NANOSECONDS);
+
+  REG(MTIME_MM) = 0;
+  REG(MTIMECMP_MM) = TTMR_NUM_OF_CLOCK_TICKS_INTERRUPT;
+
+  /* Enable mtimer interrupts */
+  set_csr(mie, MIP_MTIP);
+  set_csr(mip, MIP_MTIP);
+
+  /* Initialize timecounter */
+  riscv_generic_tc.tc_get_timecount = riscv_generic_get_timecount;
+  riscv_generic_tc.tc_counter_mask = 0xffffffff;
+  riscv_generic_tc.tc_frequency = frequency;
+  riscv_generic_tc.tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER;
+  rtems_timecounter_install(&riscv_generic_tc);
+}
+
+static void riscv_generic_clock_cleanup(void)
+{
+  /* Disable mtimer interrupts */
+  clear_csr(mie, MIP_MTIP);
+  clear_csr(mip, MIP_MTIP);
+}
+
+CPU_Counter_ticks _CPU_Counter_difference(
+  CPU_Counter_ticks second,
+  CPU_Counter_ticks first
+)
+{
+  return second - first;
+}
+
+#define Clock_driver_support_at_tick() riscv_generic_clock_at_tick()
+
+#define Clock_driver_support_initialize_hardware() riscv_generic_clock_initialize()
+
+#define Clock_driver_support_install_isr(isr) \
+  riscv_generic_clock_handler_install(isr)
+
+#define Clock_driver_support_shutdown_hardware() riscv_generic_clock_cleanup()
+
+#include "../../../shared/dev/clock/clockimpl.h"