SAMA5 PWM: Add first cut at PWM driver

ChangeLog

@@ -5970,4 +5970,8 @@
 	  logic cause re-use of a stale pointer.  Changed to a two pass
 	  uninitialization for the case of the composite driver:  Memory
 	  resources are not freed until the second uninitialization pass.
-	  From David Sidrane (2011-1105).
+	  From David Sidrane (2011-11-5).
+	* arch/arm/src/sama5/sam_pwm.c and .h:  Add PWM driver for SAMA5
+	  untested on initial checkout (not even incorporated in to build
+	  system) (2013-11-6).
+

arch/arm/src/sama5/chip/sam_pwm.h

@@ -286,6 +286,7 @@
 
 #define PWM_INT1_CHID(n)           (1 << (n))      /* Bits 0-3: Counter Event on Channel n Interrupt, n=0..3 */
 #define PWM_INT1_FCHID(n)          (1 << ((n)+16)) /* Bits 16-19: Fault Protection Trigger on Channel n Interrupt, n=0..3 */
+#define PWM_INT1_ALL               (0x000f000f)
 
 /* PWM Sync Channels Mode Register */
 
@@ -339,6 +340,7 @@
 #  define PWM_INT2_CMPU5           (1 << 21) /* Bit 21:  Comparison 5 Update Interrupt Enable */
 #  define PWM_INT2_CMPU6           (1 << 22) /* Bit 22:  Comparison 6 Update Interrupt Enable */
 #  define PWM_INT2_CMPU7           (1 << 23) /* Bit 23:  Comparison 7 Update Interrupt Enable */
+#define PWM_INT2_ALL               (0x00ffff09)
 
 /* PWM Output Override Value Register */
 
@@ -583,7 +585,8 @@
 
 #define PWM_CMR_CPRE_SHIFT         (0)       /* Bits 0-3: Channel Pre-scaler */
 #define PWM_CMR_CPRE_MASK          (15 << PWM_CMR_CPRE_SHIFT)
-#  define PWM_CMR_CPRE_ MCK        (0 << PWM_CMR_CPRE_SHIFT)  /* Master clock */
+#  define PWM_CMR_CPRE_MCKDIV(n)   ((uint32_t)(n) << PWM_CMR_CPRE_SHIFT)  /* Master clock */
+#  define PWM_CMR_CPRE_MCKDIV1     (0 << PWM_CMR_CPRE_SHIFT)  /* Master clock/2 */
 #  define PWM_CMR_CPRE_MCKDIV2     (1 << PWM_CMR_CPRE_SHIFT)  /* Master clock/2 */
 #  define PWM_CMR_CPRE_MCKDIV4     (2 << PWM_CMR_CPRE_SHIFT)  /* Master clock/4 */
 #  define PWM_CMR_CPRE_MCKDIV8     (3 << PWM_CMR_CPRE_SHIFT)  /* Master clock/8 */

arch/arm/src/sama5/sam_pwm.h

+/************************************************************************************
+ * arch/arm/src/sama5/sam_pwm.h
+ *
+ *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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.
+ *
+ ************************************************************************************/
+
+#ifndef __ARCH_ARM_SRC_SAMA5_SAM_PWM_H
+#define __ARCH_ARM_SRC_SAMA5_SAM_PWM_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include "chip.h"
+
+#ifdef CONFIG_SAMA5_PWM
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+/* Configuration ********************************************************************/
+
+/* Do we have any PWM channels enabled?  If not, then why is the PWM enabled? */
+
+#if !defined(CONFIG_SAMA5_PWM_CHAN0) && !defined(CONFIG_SAMA5_PWM_CHAN1) && \
+    !defined(CONFIG_SAMA5_PWM_CHAN2) && !defined(CONFIG_SAMA5_PWM_CHAN3)
+#  error "No PWM channels configured"
+#  undef CONFIG_SAMA5_PWM
+#endif
+
+/************************************************************************************
+ * Public Types
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Data
+ ************************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/****************************************************************************
+ * Name: sam_pwminitialize
+ *
+ * Description:
+ *   Initialize one timer for use with the upper_level PWM driver.
+ *
+ * Input Parameters:
+ *   channel - A number identifying the PWM channel use.
+ *
+ * Returned Value:
+ *   On success, a pointer to the SAMA5 lower half PWM driver is returned.
+ *   NULL is returned on any failure.
+ *
+ ****************************************************************************/
+
+FAR struct pwm_lowerhalf_s *sam_pwminitialize(int channel);
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* CONFIG_SAMA5_PWM */
+#endif /* __ARCH_ARM_SRC_SAMA5_SAM_PWM_H */