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/*
 * Any part of this program may be used in documents licensed under
 * the GNU Free Documentation License, Version 1.1 or any later version
 * published by the Free Software Foundation.
 */

#ifndef _PARPORT_H_
#define _PARPORT_H_

/* Start off with user-visible constants */

/* Maximum of 16 ports per machine */
#define PARPORT_MAX  16

/* Magic numbers */
#define PARPORT_IRQ_NONE  -1
#define PARPORT_DMA_NONE  -1
#define PARPORT_IRQ_AUTO  -2
#define PARPORT_DMA_AUTO  -2
#define PARPORT_DMA_NOFIFO -3
#define PARPORT_DISABLE   -2
#define PARPORT_IRQ_PROBEONLY -3
#define PARPORT_IOHI_AUTO -1

#define PARPORT_CONTROL_STROBE    0x1
#define PARPORT_CONTROL_AUTOFD    0x2
#define PARPORT_CONTROL_INIT      0x4
#define PARPORT_CONTROL_SELECT    0x8

#define PARPORT_STATUS_ERROR      0x8
#define PARPORT_STATUS_SELECT     0x10
#define PARPORT_STATUS_PAPEROUT   0x20
#define PARPORT_STATUS_ACK        0x40
#define PARPORT_STATUS_BUSY       0x80

/* Type classes for Plug-and-Play probe.  */
typedef enum {
	PARPORT_CLASS_LEGACY = 0,       /* Non-IEEE1284 device */
	PARPORT_CLASS_PRINTER,
	PARPORT_CLASS_MODEM,
	PARPORT_CLASS_NET,
	PARPORT_CLASS_HDC,              /* Hard disk controller */
	PARPORT_CLASS_PCMCIA,
	PARPORT_CLASS_MEDIA,            /* Multimedia device */
	PARPORT_CLASS_FDC,              /* Floppy disk controller */
	PARPORT_CLASS_PORTS,
	PARPORT_CLASS_SCANNER,
	PARPORT_CLASS_DIGCAM,
	PARPORT_CLASS_OTHER,            /* Anything else */
	PARPORT_CLASS_UNSPEC,           /* No CLS field in ID */
	PARPORT_CLASS_SCSIADAPTER
} parport_device_class;

/* The "modes" entry in parport is a bit field representing the
   capabilities of the hardware. */
#define PARPORT_MODE_PCSPP	(1<<0) /* IBM PC registers available. */
#define PARPORT_MODE_TRISTATE	(1<<1) /* Can tristate. */
#define PARPORT_MODE_EPP	(1<<2) /* Hardware EPP. */
#define PARPORT_MODE_ECP	(1<<3) /* Hardware ECP. */
#define PARPORT_MODE_COMPAT	(1<<4) /* Hardware 'printer protocol'. */
#define PARPORT_MODE_DMA	(1<<5) /* Hardware can DMA. */
#define PARPORT_MODE_SAFEININT	(1<<6) /* SPP registers accessible in IRQ. */

/* IEEE1284 modes: 
   Nibble mode, byte mode, ECP, ECPRLE and EPP are their own
   'extensibility request' values.  Others are special.
   'Real' ECP modes must have the IEEE1284_MODE_ECP bit set.  */
#define IEEE1284_MODE_NIBBLE             0
#define IEEE1284_MODE_BYTE              (1<<0)
#define IEEE1284_MODE_COMPAT            (1<<8)
#define IEEE1284_MODE_BECP              (1<<9) /* Bounded ECP mode */
#define IEEE1284_MODE_ECP               (1<<4)
#define IEEE1284_MODE_ECPRLE            (IEEE1284_MODE_ECP | (1<<5))
#define IEEE1284_MODE_ECPSWE            (1<<10) /* Software-emulated */
#define IEEE1284_MODE_EPP               (1<<6)
#define IEEE1284_MODE_EPPSL             (1<<11) /* EPP 1.7 */
#define IEEE1284_MODE_EPPSWE            (1<<12) /* Software-emulated */
#define IEEE1284_DEVICEID               (1<<2)  /* This is a flag */
#define IEEE1284_EXT_LINK               (1<<14) /* This flag causes the
						 * extensibility link to
						 * be requested, using
						 * bits 0-6. */

/* For the benefit of parport_read/write, you can use these with
 * parport_negotiate to use address operations.  They have no effect
 * other than to make parport_read/write use address transfers. */
#define IEEE1284_ADDR			(1<<13)	/* This is a flag */
#define IEEE1284_DATA			 0	/* So is this */

/* Flags for block transfer operations. */
#define PARPORT_EPP_FAST		(1<<0) /* Unreliable counts. */
#define PARPORT_W91284PIC		(1<<1) /* have a Warp9 w91284pic in the device */

/* The rest is for the kernel only */
#ifdef __KERNEL__

#include <linux/jiffies.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/irqreturn.h>
#include <linux/semaphore.h>
#include <asm/system.h>
#include <asm/ptrace.h>

/* Define this later. */
struct parport;
struct pardevice;

struct pc_parport_state {
	unsigned int ctr;
	unsigned int ecr;
};

struct ax_parport_state {
	unsigned int ctr;
	unsigned int ecr;
	unsigned int dcsr;
};

/* used by both parport_amiga and parport_mfc3 */
struct amiga_parport_state {
       unsigned char data;     /* ciaa.prb */
       unsigned char datadir;  /* ciaa.ddrb */
       unsigned char status;   /* ciab.pra & 7 */
       unsigned char statusdir;/* ciab.ddrb & 7 */
};

struct ax88796_parport_state {
	unsigned char cpr;
};

struct ip32_parport_state {
	unsigned int dcr;
	unsigned int ecr;
};

struct parport_state {
	union {
		struct pc_parport_state pc;
		/* ARC has no state. */
		struct ax_parport_state ax;
		struct amiga_parport_state amiga;
		struct ax88796_parport_state ax88796;
		/* Atari has not state. */
		struct ip32_parport_state ip32;
		void *misc; 
	} u;
};

struct parport_operations {
	/* IBM PC-style virtual registers. */
	void (*write_data)(struct parport *, unsigned char);
	unsigned char (*read_data)(struct parport *);

	void (*write_control)(struct parport *, unsigned char);
	unsigned char (*read_control)(struct parport *);
	unsigned char (*frob_control)(struct parport *, unsigned char mask,
				      unsigned char val);

	unsigned char (*read_status)(struct parport *);

	/* IRQs. */
	void (*enable_irq)(struct parport *);
	void (*disable_irq)(struct parport *);

	/* Data direction. */
	void (*data_forward) (struct parport *);
	void (*data_reverse) (struct parport *);

	/* For core parport code. */
	void (*init_state)(struct pardevice *, struct parport_state *);
	void (*save_state)(struct parport *, struct parport_state *);
	void (*restore_state)(struct parport *, struct parport_state *);

	/* Block read/write */
	size_t (*epp_write_data) (struct parport *port, const void *buf,
				  size_t len, int flags);
	size_t (*epp_read_data) (struct parport *port, void *buf, size_t len,
				 int flags);
	size_t (*epp_write_addr) (struct parport *port, const void *buf,
				  size_t len, int flags);
	size_t (*epp_read_addr) (struct parport *port, void *buf, size_t len,
				 int flags);

	size_t (*ecp_write_data) (struct parport *port, const void *buf,
				  size_t len, int flags);
	size_t (*ecp_read_data) (struct parport *port, void *buf, size_t len,
				 int flags);
	size_t (*ecp_write_addr) (struct parport *port, const void *buf,
				  size_t len, int flags);

	size_t (*compat_write_data) (struct parport *port, const void *buf,
				     size_t len, int flags);
	size_t (*nibble_read_data) (struct parport *port, void *buf,
				    size_t len, int flags);
	size_t (*byte_read_data) (struct parport *port, void *buf,
				  size_t len, int flags);
	struct module *owner;
};

struct parport_device_info {
	parport_device_class class;
	const char *class_name;
	const char *mfr;
	const char *model;
	const char *cmdset;
	const char *description;
};

/* Each device can have two callback functions:
 *  1) a preemption function, called by the resource manager to request
 *     that the driver relinquish control of the port.  The driver should
 *     return zero if it agrees to release the port, and nonzero if it 
 *     refuses.  Do not call parport_release() - the kernel will do this
 *     implicitly.
 *
 *  2) a wake-up function, called by the resource manager to tell drivers
 *     that the port is available to be claimed.  If a driver wants to use
 *     the port, it should call parport_claim() here.
 */

/* A parallel port device */
struct pardevice {
	const char *name;
	struct parport *port;
	int daisy;
	int (*preempt)(void *);
	void (*wakeup)(void *);
	void *private;
	void (*irq_func)(void *);
	unsigned int flags;
	struct pardevice *next;
	struct pardevice *prev;
	struct parport_state *state;     /* saved status over preemption */
	wait_queue_head_t wait_q;
	unsigned long int time;
	unsigned long int timeslice;
	volatile long int timeout;
	unsigned long waiting;		 /* long req'd for set_bit --RR */
	struct pardevice *waitprev;
	struct pardevice *waitnext;
	void * sysctl_table;
};

/* IEEE1284 information */

/* IEEE1284 phases. These are exposed to userland through ppdev IOCTL
 * PP[GS]ETPHASE, so do not change existing values. */
enum ieee1284_phase {
	IEEE1284_PH_FWD_DATA,
	IEEE1284_PH_FWD_IDLE,
	IEEE1284_PH_TERMINATE,
	IEEE1284_PH_NEGOTIATION,
	IEEE1284_PH_HBUSY_DNA,
	IEEE1284_PH_REV_IDLE,
	IEEE1284_PH_HBUSY_DAVAIL,
	IEEE1284_PH_REV_DATA,
	IEEE1284_PH_ECP_SETUP,
	IEEE1284_PH_ECP_FWD_TO_REV,
	IEEE1284_PH_ECP_REV_TO_FWD,
	IEEE1284_PH_ECP_DIR_UNKNOWN,
};
struct ieee1284_info {
	int mode;
	volatile enum ieee1284_phase phase;
	struct semaphore irq;
};

/* A parallel port */
struct parport {
	unsigned long base;	/* base address */
	unsigned long base_hi;  /* base address (hi - ECR) */


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