From d374492cc69fa8bd041852d868ae379b79c59ba4 Mon Sep 17 00:00:00 2001
From: Thomas Doerfler <Thomas.Doerfler@embedded-brains.de>
Date: Tue, 21 Jul 2009 08:38:04 +0000
Subject: Update for MPC55XX changes

---
 .../libbsp/powerpc/mpc55xxevb/clock/clock-config.c | 150 +++++++++++++++++++++
 1 file changed, 150 insertions(+)
 create mode 100644 c/src/lib/libbsp/powerpc/mpc55xxevb/clock/clock-config.c

(limited to 'c/src/lib/libbsp/powerpc/mpc55xxevb/clock')

diff --git a/c/src/lib/libbsp/powerpc/mpc55xxevb/clock/clock-config.c b/c/src/lib/libbsp/powerpc/mpc55xxevb/clock/clock-config.c
new file mode 100644
index 0000000000..b9601d08d7
--- /dev/null
+++ b/c/src/lib/libbsp/powerpc/mpc55xxevb/clock/clock-config.c
@@ -0,0 +1,150 @@
+/**
+ * @file
+ *
+ * @ingroup mpc55xx
+ *
+ * @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 <mpc55xx/regs.h>
+#include <mpc55xx/emios.h>
+
+#include <rtems.h>
+
+#include <bsp.h>
+#include <bsp/irq.h>
+
+#define RTEMS_STATUS_CHECKS_USE_PRINTK
+
+#include <rtems/status-checks.h>
+
+#define MPC55XX_CLOCK_EMIOS_CHANNEL (MPC55XX_EMIOS_CHANNEL_NUMBER - 1)
+
+/* This is defined in clockdrv_shell.h */
+rtems_isr Clock_isr( rtems_vector_number vector);
+
+#define Clock_driver_support_at_tick() \
+ do { \
+    union EMIOS_CSR_tag csr = MPC55XX_ZERO_FLAGS; \
+    csr.B.FLAG = 1; \
+    EMIOS.CH [MPC55XX_CLOCK_EMIOS_CHANNEL].CSR.R = csr.R; \
+ } while (0)
+
+static void mpc55xx_clock_handler_install( void)
+{
+  rtems_status_code sc = RTEMS_SUCCESSFUL;
+
+  sc = mpc55xx_interrupt_handler_install(
+    MPC55XX_IRQ_EMIOS_GET_REQUEST( MPC55XX_CLOCK_EMIOS_CHANNEL),
+    "clock",
+    RTEMS_INTERRUPT_UNIQUE,
+    MPC55XX_INTC_MIN_PRIORITY,
+    (rtems_interrupt_handler) Clock_isr,
+    NULL
+  );
+  RTEMS_CHECK_SC_VOID( sc, "install clock interrupt handler");
+}
+
+static void mpc55xx_clock_initialize( void)
+{
+  volatile struct EMIOS_CH_tag *regs = &EMIOS.CH [MPC55XX_CLOCK_EMIOS_CHANNEL];
+  union EMIOS_CCR_tag ccr = MPC55XX_ZERO_FLAGS;
+  union EMIOS_CSR_tag csr = MPC55XX_ZERO_FLAGS;
+  unsigned prescaler = mpc55xx_emios_global_prescaler();
+  uint64_t interval = ((uint64_t) bsp_clock_speed
+    * (uint64_t) rtems_configuration_get_microseconds_per_tick()) / 1000000;
+
+  /* Apply prescaler */
+  if (prescaler > 0) {
+    interval /= (uint64_t) prescaler;
+  } else {
+    RTEMS_SYSLOG_ERROR( "unexpected global eMIOS prescaler\n");
+  }
+
+  /* Check interval */
+  if (interval == 0 || interval > MPC55XX_EMIOS_VALUE_MAX) {
+    interval = MPC55XX_EMIOS_VALUE_MAX;
+    RTEMS_SYSLOG_ERROR( "clock timer interval out of range\n");
+  }
+
+  /* Configure eMIOS channel */
+  
+  /* Set channel in GPIO mode */
+  ccr.B.MODE = MPC55XX_EMIOS_MODE_GPIO_INPUT;
+  regs->CCR.R = ccr.R;
+  
+  /* Clear status flags */
+  csr.B.OVR = 1;
+  csr.B.OVFL = 1;
+  csr.B.FLAG = 1;
+  regs->CSR.R = csr.R;
+  
+  /* Set timer period */
+  regs->CADR.R = (uint32_t) interval - 1;
+  
+  /* Set unused registers */
+  regs->CBDR.R = 0;
+  regs->CCNTR.R = 0;
+  regs->ALTCADR.R = 0;
+  
+  /* Set control register */
+  ccr.B.MODE = MPC55XX_EMIOS_MODE_MC_UP_INT_CLK;
+  ccr.B.UCPREN = 1;
+  ccr.B.FEN = 1;
+  ccr.B.FREN = 1;
+  regs->CCR.R = ccr.R;
+}
+
+static void mpc55xx_clock_cleanup( void)
+{
+  rtems_status_code sc = RTEMS_SUCCESSFUL;
+  volatile struct EMIOS_CH_tag *regs = &EMIOS.CH [MPC55XX_CLOCK_EMIOS_CHANNEL];
+  union EMIOS_CCR_tag ccr = MPC55XX_ZERO_FLAGS;
+
+  /* Set channel in GPIO mode */
+  ccr.B.MODE = MPC55XX_EMIOS_MODE_GPIO_INPUT;
+  regs->CCR.R = ccr.R;
+
+  /* Remove interrupt handler */
+  sc = rtems_interrupt_handler_remove(
+    MPC55XX_IRQ_EMIOS_GET_REQUEST( MPC55XX_CLOCK_EMIOS_CHANNEL),
+    (rtems_interrupt_handler) Clock_isr,
+    NULL
+  );
+  RTEMS_CHECK_SC_VOID( sc, "remove clock interrupt handler");
+}
+
+static uint32_t mpc55xx_clock_nanoseconds_since_last_tick( void)
+{
+  uint64_t clicks = EMIOS.CH [MPC55XX_CLOCK_EMIOS_CHANNEL].CCNTR.R;
+  uint64_t clock = bsp_clock_speed;
+  uint64_t ns = (clicks * 1000000000) / clock;
+  
+  return (uint32_t) ns;
+}
+ 
+#define Clock_driver_support_initialize_hardware() mpc55xx_clock_initialize()
+
+#define Clock_driver_support_install_isr( isr, old_isr) \
+  mpc55xx_clock_handler_install()
+
+#define Clock_driver_support_shutdown_hardware() mpc55xx_clock_cleanup()
+  
+#define Clock_driver_nanoseconds_since_last_tick \
+  mpc55xx_clock_nanoseconds_since_last_tick
+
+/* Include shared source clock driver code */
+#include "../../../../libbsp/shared/clockdrv_shell.h"
-- 
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