/**
 * @file me4600_ao.h
 *
 * @brief Meilhaus ME-4000 analog output subdevice class.
 * @note Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
 * @author Guenter Gebhardt
 */

/*
 * Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
 *
 * This file 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef _ME4600_AO_H_
# define _ME4600_AO_H_

# include <linux/version.h>
# include "mesubdevice.h"
# include "mecirc_buf.h"
# include "meioctl.h"

# ifdef __KERNEL__

#  ifdef BOSCH
#   undef ME_SYNAPSE
#   ifndef _CBUFF_32b_t
# 	 define _CBUFF_32b_t
#   endif //_CBUFF_32b_t
#  endif //BOSCH

#  define ME4600_AO_MAX_SUBDEVICES		4
#  define ME4600_AO_FIFO_COUNT			4096

#  define ME4600_AO_BASE_FREQUENCY		33000000LL

#  define ME4600_AO_MIN_ACQ_TICKS		0LL
#  define ME4600_AO_MAX_ACQ_TICKS		0LL

#  define ME4600_AO_MIN_CHAN_TICKS		66LL
#  define ME4600_AO_MAX_CHAN_TICKS		0xFFFFFFFFLL

#  define ME4600_AO_MIN_RANGE			-10000000
#  define ME4600_AO_MAX_RANGE			9999694

#  define ME4600_AO_MAX_DATA			0xFFFF

#  ifdef ME_SYNAPSE
#   define ME4600_AO_CIRC_BUF_SIZE_ORDER 		8	// 2^n PAGES =>> Maximum value of 1MB for Synapse
#  else
#   define ME4600_AO_CIRC_BUF_SIZE_ORDER 		5	// 2^n PAGES =>> 128KB
#  endif
#  define ME4600_AO_CIRC_BUF_SIZE 		PAGE_SIZE<<ME4600_AO_CIRC_BUF_SIZE_ORDER	// Buffer size in bytes.

#  ifdef _CBUFF_32b_t
#   define ME4600_AO_CIRC_BUF_COUNT	((ME4600_AO_CIRC_BUF_SIZE) / sizeof(uint32_t))	// Size in values
#  else
#   define ME4600_AO_CIRC_BUF_COUNT	((ME4600_AO_CIRC_BUF_SIZE) / sizeof(uint16_t))	// Size in values
#  endif

#  define ME4600_AO_CONTINOUS					0x0
#  define ME4600_AO_WRAP_MODE					0x1
#  define ME4600_AO_HW_MODE						0x2

#  define ME4600_AO_HW_WRAP_MODE				(ME4600_AO_WRAP_MODE | ME4600_AO_HW_MODE)
#  define ME4600_AO_SW_WRAP_MODE				ME4600_AO_WRAP_MODE

#  define ME4600_AO_INF_STOP_MODE				0x0
#  define ME4600_AO_ACQ_STOP_MODE				0x1
#  define ME4600_AO_SCAN_STOP_MODE				0x2

#  ifdef BOSCH			//SPECIAL BUILD FOR BOSCH

/* Bits for flags attribute. */
#   define ME4600_AO_FLAGS_BROKEN_PIPE			0x1
#   define ME4600_AO_FLAGS_SW_WRAP_MODE_0		0x2
#   define ME4600_AO_FLAGS_SW_WRAP_MODE_1		0x4
#   define ME4600_AO_FLAGS_SW_WRAP_MODE_MASK	(ME4600_AO_FLAGS_SW_WRAP_MODE_0 | ME4600_AO_FLAGS_SW_WRAP_MODE_1)

#   define ME4600_AO_FLAGS_SW_WRAP_MODE_NONE	0x0
#   define ME4600_AO_FLAGS_SW_WRAP_MODE_INF		0x2
#   define ME4600_AO_FLAGS_SW_WRAP_MODE_FIN		0x4

	/**
	* @brief The ME-4000 analog output subdevice class.
	*/
typedef struct me4600_ao_subdevice {
	/* Inheritance */
	me_subdevice_t base;				/**< The subdevice base class. */

	/* Attributes */
	spinlock_t subdevice_lock;			/**< Spin lock to protect the subdevice from concurrent access. */
	spinlock_t *preload_reg_lock;		/**< Spin lock to protect #preload_reg from concurrent access. */
	uint32_t *preload_flags;

	unsigned int irq;					/**< The interrupt request number assigned by the PCI BIOS. */
	me_circ_buf_t circ_buf;				/**< Circular buffer holding measurment data. */
	wait_queue_head_t wait_queue;		/**< Wait queue to put on tasks waiting for data to arrive. */

	int single_value;					/**< Mirror of the value written in single mode. */

	int volatile flags;					/**< Flags used for storing SW wraparound setup and error signalling from ISR. */
	unsigned int wrap_count;			/**< The user defined wraparound cycle count. */
	unsigned int wrap_remaining;		/**< The wraparound cycle down counter used by a running conversion. */
	unsigned int ao_idx;				/**< The index of this analog output on this device. */
	int fifo;							/**< If set this device has a FIFO. */

	int bosch_fw;						/**< If set the bosch firmware is in PROM. */

	/* Registers */
	uint32_t ctrl_reg;
	uint32_t status_reg;
	uint32_t fifo_reg;
	uint32_t single_reg;
	uint32_t timer_reg;
	uint32_t irq_status_reg;
	uint32_t preload_reg;
	uint32_t reg_base;
} me4600_ao_subdevice_t;

	/**
	* @brief The constructor to generate a ME-4000 analog output subdevice instance for BOSCH project.
	*
	* @param reg_base The register base address of the device as returned by the PCI BIOS.
	* @param ctrl_reg_lock Pointer to spin lock protecting the control register from concurrent access.
	* @param preload_flags Pointer to spin lock protecting the hold&trigger register from concurrent access.
	* @param ao_idx Subdevice number.
	* @param fifo Flag set if subdevice has hardware FIFO.
	* @param irq IRQ number.
	*
	* @return Pointer to new instance on success.\n
	* NULL on error.
	*/
me4600_ao_subdevice_t *me4600_ao_constructor(uint32_t reg_base,
					     spinlock_t * preload_reg_lock,
					     uint32_t * preload_flags,
					     int ao_idx, int fifo, int irq);

#  else	//~BOSCH

//ME4600_AO_FLAGS_BROKEN_PIPE is OBSOLETE => Now problems are reported in status.

typedef enum ME4600_AO_STATUS {
	ao_status_none = 0,
	ao_status_single_configured,
	ao_status_single_run_wait,
	ao_status_single_run,
	ao_status_single_end_wait,
	ao_status_single_end,
	ao_status_stream_configured,
	ao_status_stream_run_wait,
	ao_status_stream_run,
	ao_status_stream_end_wait,
	ao_status_stream_end,
	ao_status_stream_fifo_error,
	ao_status_stream_buffer_error,
	ao_status_stream_error,
	ao_status_last
} ME4600_AO_STATUS;

typedef struct me4600_ao_timeout {
	unsigned long start_time;
	unsigned long delay;
} me4600_ao_timeout_t;

	/**
	* @brief The ME-4600 analog output subdevice class.
	*/
typedef struct me4600_ao_subdevice {
	/* Inheritance */
	me_subdevice_t base;						/**< The subdevice base class. */
	unsigned int ao_idx;						/**< The index of this analog output on this device. */

	/* Attributes */
	spinlock_t subdevice_lock;					/**< Spin lock to protect the subdevice from concurrent access. */
	spinlock_t *preload_reg_lock;				/**< Spin lock to protect preload_reg from concurrent access. */

	uint32_t *preload_flags;

	/* Hardware feautres */
	unsigned int irq;							/**< The interrupt request number assigned by the PCI BIOS. */
	int fifo;									/**< If set this device has a FIFO. */
	int bitpattern;								/**< If set this device use bitpattern. */

	int single_value;							/**< Mirror of the output value in single mode. */
	int single_value_in_fifo;					/**< Mirror of the value written in single mode. */
	uint32_t ctrl_trg;							/**< Mirror of the trigger settings. */

	volatile int mode;							/**< Flags used for storing SW wraparound setup*/
	int stop_mode;								/**< The user defined stop condition flag. */
	unsigned int start_mode;
	unsigned int stop_count;					/**< The user defined dates presentation end count. */
	unsigned int stop_data_count;				/**< The stop presentation count. */
	unsigned int data_count;					/**< The real presentation count. */
	unsigned int preloaded_count;				/**< The next data addres in buffer. <= for wraparound mode. */
	int hardware_stop_delay;					/**< The time that stop can take. This is only to not show hardware bug to user. */

	volatile enum ME4600_AO_STATUS status;		/**< The current stream status flag. */
	me4600_ao_timeout_t timeout;				/**< The timeout for start in blocking and non-blocking mode. */

										/* Registers *//**< All registers are 32 bits long. */
	unsigned long ctrl_reg;
	unsigned long status_reg;
	unsigned long fifo_reg;
	unsigned long single_reg;
	unsigned long timer_reg;
	unsigned long irq_status_reg;
	unsigned long preload_reg;
	unsigned long reg_base;

	/* Software buffer */
	me_circ_buf_t circ_buf;						/**< Circular buffer holding measurment data. 32 bit long */
	wait_queue_head_t wait_queue;				/**< Wait queue to put on tasks waiting for data to arrive. */

	struct workqueue_struct *me4600_workqueue;
	struct delayed_work ao_control_task;

	volatile int ao_control_task_flag;			/**< Flag controling reexecuting of control task */

} me4600_ao_subdevice_t;

	/**
	* @brief The constructor to generate a ME-4600 analog output subdevice instance.
	*
	* @param reg_base The register base address of the device as returned by the PCI BIOS.
	* @param ctrl_reg_lock Pointer to spin lock protecting the control register from concurrent access.
	* @param preload_flags Pointer to spin lock protecting the hold&trigger register from concurrent access.
	* @param ao_idx Subdevice number.
	* @param fifo Flag set if subdevice has hardware FIFO.
	* @param irq IRQ number.
	* @param me4600_wq Queue for asynchronous task (1 queue for all subdevice on 1 board).
	*
	* @return Pointer to new instance on success.\n
	* NULL on error.
	*/
me4600_ao_subdevice_t *me4600_ao_constructor(uint32_t reg_base,
					     spinlock_t * preload_reg_lock,
					     uint32_t * preload_flags,
					     int ao_idx,
					     int fifo,
					     int irq,
					     struct workqueue_struct
					     *me4600_wq);

#  endif //BOSCH
# endif	//__KERNEL__
#endif // ~_ME4600_AO_H_