Tiva ADC: Adds a Tiva ADC driver. From Calvin Maguranis

arch/arm/src/tiva/tiva_adc.h

+/****************************************************************************
+ * arch/arm/src/tiva/tiva_adc.h
+ *
+ *   Copyright (C) 2015 TRD2 Inc. All rights reserved.
+ *   Author: Calvin Maguranis <calvin.maguranis@trd2inc.com>
+ *
+ * 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_TIVA_TIVA_ADC_H
+#define __ARCH_ARM_SRC_TIVA_TIVA_ADC_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/analog/adc.h>
+#include <nuttx/fs/ioctl.h>
+
+#include "chip.h"
+#include "chip/tiva_adc.h"
+
+#ifdef CONFIG_TIVA_ADC
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+
+#define TIVA_ADC_PWM_TRIG_IOCTL _ANIOC(0x00F0)
+
+/* PWM trigger support definitions *************************************************/
+
+#define ADC_TRIG_PWM_MASK \
+    (0xE0000000 & ADC_EMUX_PWM0 & ADC_EMUX_PWM1 & ADC_EMUX_PWM2 & ADC_EMUX_PWM3)
+
+/* Encodes the PWM generator (0 to 3) value to the 2 MSB's of 32-bits;
+ * PWM module (0 or 1) value in the 3rd MSB:
+ *      0bGGM0.0000.0000.0000,0000.0000.0000.0000
+ * To be OR'd with a trigger register value.
+ */
+
+#define PWM_GEN_SHIFT (31)
+#define PWM_MOD_SHIFT (30)
+#  define ADC_TRIG_PWM_IOCTL(gen,mod) \
+    (((gen) << PWM_GEN_SHIFT) | ((mod) << PWM_MOD_SHIFT))
+
+/* Decodes PWM generator number from trigger */
+
+#define PWM_GEN_MASK             (0xC0000000)
+#  define ADC_TRIG_PWM_GEN(trig) \
+    (((trig)&PWM_GEN_MASK)>>(PWM_GEN_SHIFT-1))
+
+/* Decodes PWM module number from trigger */
+
+#define PWM_MOD_MASK             (0x20000000)
+#  define ADC_TRIG_PWM_MOD(trig) \
+    (((trig)&PWM_MOD_MASK)>>(PWM_MOD_SHIFT-1))
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+#ifndef __ASSEMBLY__
+#  ifdef __cplusplus
+#  define EXTERN extern "C"
+extern "C"
+{
+#  else
+#  define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Name: tiva_adc_initialize
+ *
+ * Description:
+ *   Initialize the ADC
+ *
+ * Returned Value:
+ *   Valid can device structure reference on succcess; a NULL on failure
+ *
+ ****************************************************************************/
+
+FAR struct adc_dev_s *tiva_adc_initialize(int adc_num);
+
+/****************************************************************************
+ * Interfaces exported from the ADC driver
+ ****************************************************************************/
+
+struct tiva_adc_s;
+
+/****************************************************************************
+ * Name: tiva_adc_lock
+ *
+ * Description:
+ *   Get exclusive access to the ADC interface
+ *
+ ****************************************************************************/
+
+void tiva_adc_lock(FAR struct tiva_adc_s *priv, int sse);
+
+/****************************************************************************
+ * Name: tiva_adc_unlock
+ *
+ * Description:
+ *   Relinquish the lock on the ADC interface
+ *
+ ****************************************************************************/
+
+void tiva_adc_unlock(FAR struct tiva_adc_s *priv, int sse);
+
+/****************************************************************************
+ * Name: tiva_adc_getreg
+ *
+ * Description:
+ *   Read any 32-bit register using an absolute address.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_TIVA_ADC_REGDEBUG
+uint32_t tiva_adc_getreg(FAR struct tiva_adc_s *priv, uintptr_t address);
+#else
+#  define tiva_adc_getreg(handle,addr) getreg32(addr)
+#endif
+
+/****************************************************************************
+ * Name: tiva_adc_putreg
+ *
+ * Description:
+ *   Write to any 32-bit register using an absolute address.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_TIVA_ADC_REGDEBUG
+void tiva_adc_putreg(FAR struct tiva_adc_s *priv, uintptr_t address,
+                    uint32_t regval);
+#else
+#  define tiva_adc_putreg(handle,addr,val) putreg32(val,addr)
+#endif
+
+#  undef EXTERN
+#  ifdef __cplusplus
+}
+#  endif
+#endif /* __ASSEMBLY__ */
+#endif /* CONFIG_TIVA_ADC */
+#endif /* __ARCH_ARM_SRC_TIVA_TIVA_ADC_H */