Add Uros' RCC actitivity counter to STM32 idle loop

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3900 42af7a65-404d-4744-a932-0658087f49c3

arch/arm/src/stm32/Make.defs

@@ -51,3 +51,6 @@ CHIP_CSRCS	= stm32_start.c stm32_rcc.c stm32_gpio.c stm32_flash.c \
 		  stm32_tim.c stm32_i2c.c stm32_pwr.c stm32_rtc.c \
 		  stm32_idle.c stm32_waste.c
 
+ifeq ($(CONFIG_STM32_RCCLOCK),y)
+CHIP_CSRCS	+= stm32_rcclock.c
+endif

arch/arm/src/stm32/stm32_idle.c

@@ -42,6 +42,7 @@
 
 #include <nuttx/arch.h>
 #include "up_internal.h"
+#include "stm32_rcc.h"
 
 /****************************************************************************
  * Pre-processor Definitions
@@ -94,6 +95,20 @@ void up_idle(void)
   sched_process_timer();
 #else
 
+#ifdef CONFIG_STM32_RCCLOCK
+
+  /* Decide, which power saving level can be obtained */
+
+  if (stm32_getrccactivity())
+    {
+	  /* Sleep mode */
+    }
+  else
+    {
+	  /* Stop mode */
+    }
+#endif
+
   /* Sleep until an interrupt occurs to save power */
 
   BEGIN_IDLE();

arch/arm/src/stm32/stm32_rcc.c

@@ -63,18 +63,6 @@
  * Private Data
  ****************************************************************************/
 
-/* Activity reference count, showing inactivity after start-up.
- * Device drivers increment this count using rcclock() and rccunlock()
- * 
- * If this value goes beyond the range [0, MAX_RCCs] indicates
- * reference count leakage (asymetric number of locks vs. unlocks) and
- * system enters permanent active state.
- */
-
-#ifdef CONFIG_STM32_RCCLOCK
-static int stm32_rcclock_count = 0; 
-#endif
- 
 /****************************************************************************
  * Private Functions
  ****************************************************************************/
@@ -491,7 +479,7 @@ void stm32_clockconfig(void)
   /* Make sure that we are starting in the reset state */
 
   rcc_reset();
-  
+
 #if defined(CONFIG_ARCH_BOARD_STM32_CUSTOM_CLOCKCONFIG)
 
   /* Invoke Board Custom Clock Configuration */
@@ -507,7 +495,7 @@ void stm32_clockconfig(void)
 #endif
 
   /* Enable peripheral clocking */
-  
+
   rcc_enableahb();
   rcc_enableapb2();
   rcc_enableapb1();
@@ -536,43 +524,3 @@ void stm32_rcc_enablelse(void)
 
   modifyreg16(STM32_RCC_BDCR, 0, RCC_BDCR_RTCEN);    
 }
-
-#ifdef CONFIG_STM32_RCCLOCK
-uint32_t stm32_rcclock(uint8_t domain_id)
-{
-  // THINK:
-  // maybe just shift domain_id into 32-bit or 64-bit register 
-  // and if there value of this var != 0, we are active...
-  // increment some variable, so it is possible to test leakage
-  // multiple locks or multiple unlocks
-    
-  if (stm32_rcclock_count >= 0)
-    {
-      stm32_rcclock_count++;
-      if (stm32_rcclock_count > 64)
-        {
-          stm32_rcclock_count = -1; /* capture error */
-        }
-    }
-    
-  return 0;
-}
-
-uint32_t stm32_rccunlock(uint8_t domain_id)
-{
-    if (stm32_rcclock_count > -1)
-      {
-        stm32_rcclock_count--;
-      }
-    return 0;
-}
-
-uint32_t stm32_setrccoptions(uint8_t domain_id, uint32_t options)
-{
-}
-
-int stm32_getrccactivity(void)
-{
-    return stm32_rcclock_count;
-}
-#endif

arch/arm/src/stm32/stm32_rcclock.c

@@ -0,0 +1,111 @@
+/****************************************************************************
+ * arch/arm/src/stm32/stm32_rcc.c
+ *
+ *   Copyright (C) 2011 Uros Platise. All rights reserved.
+ *   Author: Author: Uros Platise <uros.platise@isotel.eu>
+ *
+ * This file is part of NuttX:
+ *
+ *   Copyright (C) 2011 Gregory Nutt. 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. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
+ * COPYRIGHT OWNER 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/* Activity reference count, showing inactivity after start-up.
+ * Device drivers increment this count using rcclock() and rccunlock()
+ * 
+ * If this value goes beyond the range [0, MAX_RCCs] indicates
+ * reference count leakage (asymetric number of locks vs. unlocks) and
+ * system enters permanent active state.
+ */
+
+static int stm32_rcclock_count = 0; 
+ 
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+uint32_t stm32_rcclock(uint8_t domain_id)
+{
+  // THINK:
+  // maybe just shift domain_id into 32-bit or 64-bit register 
+  // and if there value of this var != 0, we are active...
+  // increment some variable, so it is possible to test leakage
+  // multiple locks or multiple unlocks
+    
+  if (stm32_rcclock_count >= 0)
+    {
+      stm32_rcclock_count++;
+      if (stm32_rcclock_count > 64)
+        {
+          stm32_rcclock_count = -1; /* capture error */
+        }
+    }
+    
+  return 0;
+}
+
+uint32_t stm32_rccunlock(uint8_t domain_id)
+{
+  if (stm32_rcclock_count > -1)
+    {
+      stm32_rcclock_count--;
+    }
+  return 0;
+}
+
+uint32_t stm32_setrccoptions(uint8_t domain_id, uint32_t options)
+{
+  return 0;
+}
+
+int stm32_getrccactivity(void)
+{
+  return stm32_rcclock_count;
+}