bsps: Move interrupt controller support to bsps

This patch is a part of the BSP source reorganization.

Update #3285.

1 files changed, 343 insertions, 0 deletions

diff --git a/bsps/powerpc/virtex5/irq/irq_init.c b/bsps/powerpc/virtex5/irq/irq_init.c
new file mode 100644
index 0000000000..1fea9214aa
--- /dev/null
+++ b/bsps/powerpc/virtex5/irq/irq_init.c
@@ -0,0 +1,343 @@
+/*===============================================================*\
+| Project: RTEMS virtex BSP                                       |
++-----------------------------------------------------------------+
+| Partially based on the code references which are named below.   |
+| Adaptions, modifications, enhancements and any recent parts of  |
+| the code are:                                                   |
+|                    Copyright (c) 2007                           |
+|                    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.org/license/LICENSE.                           |
+|                                                                 |
++-----------------------------------------------------------------+
+| this file contains the irq controller handler                   |
+\*===============================================================*/
+#include <libcpu/spr.h>
+#include <bsp/irq.h>
+#include <bsp.h>
+#include <rtems/bspIo.h>
+#include <rtems/powerpc/powerpc.h>
+#include <bsp/vectors.h>
+
+static rtems_irq_connect_data rtemsIrqTbl[BSP_IRQ_NUMBER];
+rtems_irq_connect_data *BSP_rtems_irq_tbl;
+rtems_irq_global_settings* BSP_rtems_irq_config;
+
+/***********************************************************
+ * dummy functions for on/off/isOn calls
+ * these functions just do nothing fulfill the semantic
+ * requirements to enable/disable a certain interrupt or exception
+ */
+static void BSP_irq_nop_func(const rtems_irq_connect_data *unused)
+{
+  /*
+   * nothing to do
+   */
+}
+
+static void BSP_irq_nop_hdl(void *hdl)
+{
+  /*
+   * nothing to do
+   */
+}
+
+static int BSP_irq_isOn_func(const rtems_irq_connect_data *unused)
+{
+  /*
+   * nothing to do
+   */
+  return 0;
+}
+
+/***********************************************************
+ * interrupt handler and its enable/disable functions
+ ***********************************************************/
+
+/***********************************************************
+ * functions to enable/disable/query external/critical interrupts
+ */
+void BSP_irqexc_on_fnc(const rtems_irq_connect_data *conn_data)
+{
+  uint32_t msr_value;
+  /*
+   * get current MSR value
+   */
+  _CPU_MSR_GET(msr_value);
+
+  msr_value |= PPC_MSR_EE;
+  _CPU_MSR_SET(msr_value);
+}
+
+void BSP_irqexc_off_fnc(const rtems_irq_connect_data *unused)
+{
+  uint32_t msr_value;
+  /*
+   * get current MSR value
+   */
+  _CPU_MSR_GET(msr_value);
+
+  msr_value &= ~PPC_MSR_EE;
+  _CPU_MSR_SET(msr_value);
+}
+
+SPR_RW(BOOKE_TSR)
+
+static int C_dispatch_dec_handler (BSP_Exception_frame *frame, unsigned int excNum)
+{
+  /* Acknowledge the interrupt */
+  _write_BOOKE_TSR( BOOKE_TSR_DIS );
+
+  /* Handle the interrupt */
+  BSP_rtems_irq_tbl[BSP_DEC].hdl(BSP_rtems_irq_tbl[BSP_DEC].handle);
+
+  return 0;
+}
+
+
+/***********************************************************
+ * High level IRQ handler called from shared_raw_irq_code_entry
+ */
+static int C_dispatch_irq_handler (BSP_Exception_frame *frame, unsigned int excNum)
+{
+  /*
+   * Handle interrupt
+   */
+  switch(excNum) {
+  case ASM_EXT_VECTOR:
+    BSP_rtems_irq_tbl[BSP_EXT].hdl(BSP_rtems_irq_tbl[BSP_EXT].handle);
+    break;
+#if 0 /* Dealt with by C_dispatch_dec_handler(), above */
+  case ASM_BOOKE_DEC_VECTOR:
+    _write_BOOKE_TSR( BOOKE_TSR_DIS );
+    BSP_rtems_irq_tbl[BSP_DEC].hdl(BSP_rtems_irq_tbl[BSP_DEC].handle);
+    break;
+#endif
+#if 0 /* Critical interrupts not yet supported */
+  case ASM_BOOKE_CRIT_VECTOR:
+    BSP_rtems_irq_tbl[BSP_CRIT].hdl(BSP_rtems_irq_tbl[BSP_CRIT].handle);
+    break;
+#endif
+  }
+
+  return 0;
+}
+
+/***********************************************************
+ * functions to set/get/remove interrupt handlers
+ ***********************************************************/
+int BSP_install_rtems_irq_handler  (const rtems_irq_connect_data* irq)
+{
+  rtems_interrupt_level level;
+
+  /*
+   * check for valid irq name
+   * if invalid, print error and return 0
+   */
+  if (!BSP_IS_VALID_IRQ(irq->name)) {
+    printk("Invalid interrupt vector %d\n",irq->name);
+    return 0;
+  }
+
+  /*
+   * disable interrupts
+   */
+  rtems_interrupt_disable(level);
+
+  /*
+   * check, that default handler is installed now
+   */
+  if (rtemsIrqTbl[irq->name].hdl != BSP_rtems_irq_config->defaultEntry.hdl) {
+    rtems_interrupt_enable(level);
+    printk("IRQ vector %d already connected\n",irq->name);
+    return 0;
+  }
+
+  /*
+   * store new handler data
+   */
+  rtemsIrqTbl[irq->name] = *irq;
+
+  /*
+   * call "on" function to enable interrupt at device
+   */
+  irq->on(irq);
+
+  /*
+   * reenable interrupts
+   */
+  rtems_interrupt_enable(level);
+
+  return 1;
+}
+
+int BSP_get_current_rtems_irq_handler	(rtems_irq_connect_data* irq)
+{
+  rtems_interrupt_level level;
+
+  /*
+   * check for valid IRQ name
+   */
+  if (!BSP_IS_VALID_IRQ(irq->name)) {
+    return 0;
+  }
+  rtems_interrupt_disable(level);
+
+  /*
+   * return current IRQ entry
+   */
+  *irq = rtemsIrqTbl[irq->name];
+  rtems_interrupt_enable(level);
+  return 1;
+}
+
+int BSP_remove_rtems_irq_handler  (const rtems_irq_connect_data* irq)
+{
+  rtems_interrupt_level level;
+
+  /*
+   * check for valid IRQ name
+   */
+  if (!BSP_IS_VALID_IRQ(irq->name)) {
+    return 0;
+  }
+  rtems_interrupt_disable(level);
+
+  /*
+   * check, that specified handler is really connected now
+   */
+  if (rtemsIrqTbl[irq->name].hdl != irq->hdl) {
+    rtems_interrupt_enable(level);
+    return 0;
+  }
+
+  /*
+   * disable interrupt at source
+   */
+  irq->off(irq);
+
+  /*
+   * restore default interrupt handler
+   */
+  rtemsIrqTbl[irq->name] = BSP_rtems_irq_config->defaultEntry;
+
+  /*
+   * reenable interrupts
+   */
+  rtems_interrupt_enable(level);
+
+  return 1;
+}
+
+/***********************************************************
+ * functions to set/get the basic interrupt management setup
+ ***********************************************************/
+/*
+ * (Re) get info on current RTEMS interrupt management.
+ */
+int BSP_rtems_irq_mngt_get(rtems_irq_global_settings** ret_ptr)
+{
+  *ret_ptr = BSP_rtems_irq_config;
+  return 0;
+}
+
+
+/*
+ * set management stuff
+ */
+int BSP_rtems_irq_mngt_set(rtems_irq_global_settings* config)
+{
+  int                    i;
+  rtems_interrupt_level  level;
+
+  rtems_interrupt_disable(level);
+
+  /*
+   * store given configuration
+   */
+  BSP_rtems_irq_config = config;
+  BSP_rtems_irq_tbl    = BSP_rtems_irq_config->irqHdlTbl;
+
+  /*
+   * store any irq-like processor exceptions
+   */
+  for (i = BSP_PROCESSOR_IRQ_LOWEST_OFFSET;
+       i < BSP_PROCESSOR_IRQ_MAX_OFFSET;
+       i++) {
+    if (BSP_rtems_irq_tbl[i].hdl != config->defaultEntry.hdl) {
+      if (BSP_rtems_irq_tbl[i].on != NULL) {
+	BSP_rtems_irq_tbl[i].on
+	  (&(BSP_rtems_irq_tbl[i]));
+      }
+    }
+    else {
+      if (BSP_rtems_irq_tbl[i].off != NULL) {
+	BSP_rtems_irq_tbl[i].off
+	  (&(BSP_rtems_irq_tbl[i]));
+      }
+    }
+  }
+  rtems_interrupt_enable(level);
+  return 1;
+}
+
+/*
+ * dummy for an empty IRQ handler entry
+ */
+static rtems_irq_connect_data emptyIrq = {
+  0, 		         /* IRQ Name                 */
+  BSP_irq_nop_hdl,       /* handler function         */
+  NULL,                  /* handle passed to handler */
+  BSP_irq_nop_func,      /* on function              */
+  BSP_irq_nop_func,      /* off function             */
+  BSP_irq_isOn_func      /* isOn function            */
+};
+
+static rtems_irq_global_settings initialConfig = {
+  BSP_IRQ_NUMBER,           /* IRQ number               */
+  {  0, 		    /* IRQ Name                 */
+     BSP_irq_nop_hdl,       /* handler function         */
+     NULL,                  /* handle passed to handler */
+     BSP_irq_nop_func,      /* on function              */
+     BSP_irq_nop_func,      /* off function             */
+     BSP_irq_isOn_func      /* isOn function            */
+  }, /* emptyIrq */
+  rtemsIrqTbl, /* irqHdlTbl  */
+  0,           /* irqBase    */
+  NULL         /* irqPrioTbl */
+};
+
+void BSP_rtems_irq_mngt_init(unsigned cpuId)
+{
+  int i;
+
+  /*
+   * connect all exception vectors needed
+   */
+  ppc_exc_set_handler(ASM_EXT_VECTOR,       C_dispatch_irq_handler);
+  ppc_exc_set_handler(ASM_BOOKE_DEC_VECTOR, C_dispatch_dec_handler);
+
+  /*
+   * setup interrupt handlers table
+   */
+  for (i = 0;
+       i < BSP_IRQ_NUMBER;
+       i++) {
+    rtemsIrqTbl[i]      = emptyIrq;
+    rtemsIrqTbl[i].name = i;
+  }
+
+  /*
+   * initialize interrupt management
+   */
+  if (!BSP_rtems_irq_mngt_set(&initialConfig)) {
+    rtems_panic("Unable to initialize RTEMS interrupt Management!!! System locked\n");
+  }
+}