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/****************************************************************************
* arch/avr/src/avr/avr_internal.h
*
* Copyright (C) 2011-2013 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_AVR_SRC_AVR_AVR_INTERNAL_H
#define __ARCH_AVR_SRC_AVR_AVR_INTERNAL_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#ifndef __ASSEMBLY__
# include <nuttx/compiler.h>
# include <sys/types.h>
# include <stdint.h>
# include <stdbool.h>
#endif
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Macros to handle saving and restore interrupt state. The state is copied
* from the stack to the TCB, but only a referenced is passed to get the
* state from the TCB.
*/
#define up_savestate(regs) up_copystate(regs, (uint8_t*)current_regs)
#define up_restorestate(regs) (current_regs = regs)
/****************************************************************************
* Public Types
****************************************************************************/
/****************************************************************************
* Public Variables
****************************************************************************/
#ifndef __ASSEMBLY__
/* This holds a references to the current interrupt level register storage
* structure. If is non-NULL only during interrupt processing.
*/
extern volatile uint8_t *current_regs;
/* This is the beginning of heap as provided from up_head.S. This is the first
* address in DRAM after the loaded program+bss+idle stack. The end of the
* heap is CONFIG_RAM_END
*/
extern uint16_t g_idle_topstack;
#endif /* __ASSEMBLY__ */
/****************************************************************************
* Inline Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
#ifndef __ASSEMBLY__
/************************************************************************************
* Name: up_copystate
*
* Description:
* Copy the contents of a register state save structure from one location to
* another.
*
************************************************************************************/
void up_copystate(uint8_t *dest, uint8_t *src);
/************************************************************************************
* Name: up_fullcontextrestore
*
* Description:
* Restore the full context of a saved thread/task.
*
************************************************************************************/
void up_fullcontextrestore(uint8_t *restoreregs) noreturn_function;
/************************************************************************************
* Name: up_switchcontext
*
* Description:
* Switch from one thread/task context to another.
*
************************************************************************************/
void up_switchcontext(uint8_t *saveregs, uint8_t *restoreregs);
/************************************************************************************
* Name: up_doirq
*
* Description:
* Dispatch an interrupt.
*
************************************************************************************/
uint8_t *up_doirq(uint8_t irq, uint8_t *regs);
/************************************************************************************
* Name: avr_spiselect, avr_spitatus, and avr_spicmddata
*
* Description:
* These external functions must be provided by board-specific logic. They are
* implementations of the select, status, and cmddata methods of the SPI interface
* defined by struct spi_ops_s (see include/nuttx/spi/spi.h). All other methods
* including up_spiinitialize()) are provided by common LPC17xx logic. To use
* this common SPI logic on your board:
*
* 1. Provide logic in up_boardinitialize() to configure SPI chip select
* pins.
* 2. Provide avr_spiselect() and avr_spistatus() functions in your board-specific
* logic. These functions will perform chip selection and status operations
* using GPIOs in the way your board is configured.
* 2. If CONFIG_SPI_CMDDATA is defined in the NuttX configuration, provide the
* avr_spicmddata() function in your board-specific logic. This functions will
* perform cmd/data selection operations using GPIOs in the way your board is
* configured.
* 3. Add a call to at90usb_spiinitialize() in your low level application
* initialization logic
* 4. The handle returned by up_spiinitialize() may then be used to bind the
* SPI driver to higher level logic (e.g., calling mmcsd_spislotinitialize(),
* for example, will bind the SPI driver to the SPI MMC/SD driver).
*
************************************************************************************/
struct spi_dev_s;
enum spi_dev_e;
#ifdef CONFIG_AVR_SPI
void avr_spiselect(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected);
uint8_t avr_spistatus(FAR struct spi_dev_s *dev, enum spi_dev_e devid);
#ifdef CONFIG_SPI_CMDDATA
int avr_spicmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd);
#endif
#endif
#endif /* __ASSEMBLY__ */
#endif /* __ARCH_AVR_SRC_AVR_AVR_INTERNAL_H */
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