1 files changed, 249 insertions, 0 deletions
diff --git a/os/hal/platforms/AT91SAM7/ext_lld.h b/os/hal/platforms/AT91SAM7/ext_lld.h
new file mode 100644
index 000000000..4c8442481
--- /dev/null
+++ b/os/hal/platforms/AT91SAM7/ext_lld.h
@@ -0,0 +1,249 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
+                 2011 Giovanni Di Sirio,
+                 2011 Florian Goebe, Chair for Computer Science 11,
+                      RWTH Aachen University
+
+    This file is part of ChibiOS/RT.
+
+    ChibiOS/RT is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    ChibiOS/RT is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @file    AT91SAM7/ext_lld.h
+ * @brief   AT91SAM7 EXT subsystem low level driver header.
+ *
+ * @addtogroup EXT
+ * @{
+ */
+
+#ifndef _EXT_LLD_H_
+#define _EXT_LLD_H_
+
+#if HAL_USE_EXT || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver constants.                                                         */
+/*===========================================================================*/
+
+/**
+ * @brief    Pointer to the SAM7 AIC register block.
+ */
+#define SAM7_EXT_AIC    ((AT91PS_AIC *)AT91C_BASE_AIC)
+
+/**
+ * @brief    Number of channels within one ext driver.
+ */
+#define    EXT_MAX_CHANNELS            32
+
+/**
+ * @brief    Mask of priority bits in interrupt mode register.
+ */
+#define SAM7_EXT_PRIORITY_MASK        0x00000007
+
+/**
+ * @brief    Shifter for priority bits in interrupt mode register.
+ */
+#define SAM7_EXT_PRIORITY_SHIFTER    0
+
+/**
+ * @brief    Shifter for mode bits in interrupt mode register.
+ */
+#define SAM7_EXT_MODE_SHIFTER        5
+
+/*
+ * On the SAM7 architecture, a single channel can only be enables or disabled
+ * Hence, undefine the other channel mode constants
+ */
+#ifdef EXT_CH_MODE_RISING_EDGE
+#undef EXT_CH_MODE_RISING_EDGE
+#endif
+
+#ifdef EXT_CH_MODE_FALLING_EDGE
+#undef EXT_CH_MODE_FALLING_EDGE
+#endif
+
+#ifdef EXT_CH_MODE_BOTH_EDGES
+#undef EXT_CH_MODE_BOTH_EDGES
+#endif
+
+/**
+ * @name    EXT channels mode
+ * @{
+ */
+#define EXT_CH_MODE_ENABLED            1        /**< @brief Channel is enabled. */
+/** @} */
+
+/**
+ * @name    EXT drivers mode
+ * @{
+ */
+/**
+ * @brief   Mask for modes.
+ */
+#define SAM7_EXT_MODE_MASK            AT91C_AIC_SRCTYPE
+/**
+ * @brief   Falling edge callback.
+ */
+#define SAM7_EXT_MODE_FALLING_EDGE    AT91C_AIC_SRCTYPE_EXT_NEGATIVE_EDGE
+/**
+ * @brief   Rising edge callback.
+ */
+#define SAM7_EXT_MODE_RISING_EDGE    AT91C_AIC_SRCTYPE_POSITIVE_EDGE
+/**
+ * @brief   High-level callback.
+ */
+#define SAM7_EXT_MODE_HIGH_LEVEL    AT91C_AIC_SRCTYPE_HIGH_LEVEL
+/**
+ * @brief   Low-level callback.
+ */
+#define SAM7_EXT_MODE_LOW_LEVEL        AT91C_AIC_SRCTYPE_EXT_LOW_LEVEL
+/** @} */
+
+/**
+ * @name    EXT drivers priorities
+ * @{
+ */
+#define SAM7_EXT_PRIOR_HIGHEST        AT91C_AIC_PRIOR_HIGHEST
+#define SAM7_EXT_PRIOR_LOWEST        AT91C_AIC_PRIOR_LOWEST
+/** @} */
+
+/*===========================================================================*/
+/* Driver pre-compile time settings.                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Derived constants and error checks.                                       */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver data structures and types.                                         */
+/*===========================================================================*/
+
+/**
+ * @brief   EXT channel identifier.
+ */
+typedef uint32_t expchannel_t;
+
+/**
+ * @brief   Type of an EXT generic notification callback.
+ *
+ * @param[in] extp      pointer to the @p EXPDriver object triggering the
+ *                      callback
+ */
+typedef void (*extcallback_t)(EXTDriver *extp, expchannel_t channel);
+
+/**
+ * @brief   Channel configuration structure.
+ */
+typedef struct {
+  /**
+   * @brief Channel mode.
+   */
+  uint32_t              mode;
+  /**
+   * @brief Channel callback.
+   * @details  In the STM32 implementation a @p NULL callback pointer is
+   *           valid and configures the channel as an event sources instead
+   *           of an interrupt source.
+   */
+  extcallback_t         cb;
+} EXTChannelConfig;
+
+/**
+ * @brief   Driver configuration structure.
+ * @note    It could be empty on some architectures.
+ */
+typedef struct {
+  /**
+   * @brief Channel configurations.
+   */
+  EXTChannelConfig      channels[EXT_MAX_CHANNELS];
+  /* End of the mandatory fields.*/
+
+  /**
+   * @brief interrupt mode.
+   */
+  uint32_t              mode;
+
+  /**
+   * @brief interrupt priority.
+   */
+  uint32_t                priority;
+} EXTConfig;
+
+/**
+ * @brief   Structure representing an EXT driver.
+ */
+struct EXTDriver {
+  /**
+   * @brief Driver state.
+   */
+  extstate_t                state;
+  /**
+   * @brief Current configuration data.
+   */
+  const EXTConfig           *config;
+  /* End of the mandatory fields.*/
+  /**
+   * @brief Pointer to the corresponding PIO registers block.
+   */
+  AT91PS_PIO                pio;
+  /**
+   * @brief peripheral ID of the corresponding PIO block.
+   */
+  uint32_t                    pid;
+};
+
+/*===========================================================================*/
+/* Driver macros.                                                            */
+/*===========================================================================*/
+
+/**
+ * @brief    Computes the content for the interrupt source mode register.
+ */
+#define SAM7_computeSMR(mode, prio) (                                       \
+    ((mode & SAM7_EXT_MODE_MASK) << SAM7_EXT_MODE_SHIFTER) |                \
+    ((prio & SAM7_EXT_PRIORITY_MASK) << SAM7_EXT_PRIORITY_SHIFTER)          \
+)
+
+/*===========================================================================*/
+/* External declarations.                                                    */
+/*===========================================================================*/
+
+#if !defined(__DOXYGEN__)
+extern EXTDriver EXTDA;
+#if (SAM7_PLATFORM == SAM7X128) || (SAM7_PLATFORM == SAM7X256) ||           \
+    (SAM7_PLATFORM == SAM7X512)
+extern EXTDriver EXTDB;
+#endif
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+  void ext_lld_init(void);
+  void ext_lld_start(EXTDriver *extp);
+  void ext_lld_stop(EXTDriver *extp);
+  void ext_lld_channel_enable(EXTDriver *extp, expchannel_t channel);
+  void ext_lld_channel_disable(EXTDriver *extp, expchannel_t channel);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAL_USE_EXT */
+
+#endif /* _EXT_LLD_H_ */
+
+/** @} */