cc253x: Add p2 interrupt handler

The P2 Interrupt is shared across many periferal (I2C, USB, GPIO).
This adds a generic interrupt handler on which the differents drivers
can register a handler.

See Pull Request #18

cpu/cc253x/Makefile.cc253x

@@ -106,6 +106,7 @@ CONTIKI_SOURCEFILES += uart0.c uart1.c uart-intr.c
 CONTIKI_SOURCEFILES += dma.c dma_intr.c
 CONTIKI_SOURCEFILES += cc2530-rf.c
 CONTIKI_SOURCEFILES += watchdog.c rtimer-arch.c
+CONTIKI_SOURCEFILES += p2-intr.c
 CONTIKI_ASMFILES +=
 
 CONTIKI_ASMOBJECTFILES = $(addprefix $(OBJECTDIR)/,$(CONTIKI_ASMFILES:.S=.rel))

cpu/cc253x/dev/p2-intr.c

@@ -0,0 +1,95 @@
+/*
+Copyright (c) 2012, Philippe Retornaz
+Copyright (c) 2012, EPFL STI IMT LSRO1 -- Mobots group
+All rights reserved.
+
+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.
+3. The name of the author may not be used to endorse or promote
+   products derived from this software without specific prior
+   written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 "cc253x.h"
+#include "p2-intr.h"
+
+static struct cc253x_p2_handler *handlers = NULL;
+
+void
+cc253x_p2_int(void) __interrupt(P2INT_VECTOR)
+{
+  struct cc253x_p2_handler *h;
+  uint8_t handled = 0;
+
+  for(h = handlers; h != NULL; h = h->next) {
+    handled |= h->cb();
+  }
+
+  if(handled) {
+    P2IF = 0;
+  }
+}
+
+void
+cc253x_p2_register_handler(struct cc253x_p2_handler *h)
+{
+  uint8_t flags;
+
+  if(!h) {
+    return;
+  }
+
+  cc253x_p2_irq_disable(flags);
+
+  h->next = handlers;
+  handlers = h;
+
+  cc253x_p2_irq_enable(flags);
+}
+
+void
+cc253x_p2_unregister_handler(struct cc253x_p2_handler *remove)
+{
+  uint8_t flags;
+  struct cc253x_p2_handler *h = handlers;
+
+  // Protect against dumb users
+  if(!h || !remove) {
+    return;
+  }
+
+  cc253x_p2_irq_disable(flags);
+
+  if(h == remove) {
+    // First element in the list
+    handlers = h->next;
+  } else {
+    while(h->next) {
+      if(h->next == remove) {
+        h->next = h->next->next;
+        break;
+      }
+      h = h->next;
+    }
+  }
+
+  cc253x_p2_irq_enable(flags);
+}

cpu/cc253x/dev/p2-intr.h

@@ -0,0 +1,55 @@
+/*
+Copyright (c) 2012, Philippe Retornaz
+Copyright (c) 2012, EPFL STI IMT LSRO1 -- Mobots group
+All rights reserved.
+
+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.
+3. The name of the author may not be used to endorse or promote
+   products derived from this software without specific prior
+   written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
+*/
+
+#ifndef __CC253x_P2_INTR_H__
+#define __CC253x_P2_INTR_H__
+
+#include "contiki.h"
+
+#define CC253x_P2_ACK 	0x1
+#define CC253x_P2_NACK 0x0
+
+struct cc253x_p2_handler {
+  struct cc253x_p2_handler *next;
+  uint8_t (*cb) (void);
+};
+
+void cc253x_p2_register_handler(struct cc253x_p2_handler *h);
+
+void cc253x_p2_unregister_handler(struct cc253x_p2_handler *h);
+
+void cc253x_p2_int(void) __interrupt(P2INT_VECTOR);
+
+#define cc253x_p2_irq_disable(flag) do { flag = IEN2 & 0x2; IEN2 &= ~0x2; } while(0)
+#define cc253x_p2_irq_enable(flag) do { IEN2 |= flag; } while(0)
+
+#define cc253x_p2_irq_force_enable() cc253x_p2_irq_enable(0x2)
+
+#endif

platform/cc2530dk/contiki-main.c

@@ -11,6 +11,7 @@
 #include "dev/cc2530-rf.h"
 #include "dev/watchdog.h"
 #include "dev/clock-isr.h"
+#include "dev/p2-intr.h"
 #include "dev/lpm.h"
 #include "dev/button-sensor.h"
 #include "dev/adc-sensor.h"