/*	$OpenBSD: atavar.h,v 1.5 2000/04/10 07:06:16 csapuntz Exp $	*/
/*	$NetBSD: atavar.h,v 1.13 1999/03/10 13:11:43 bouyer Exp $	*/

/*
 * Copyright (c) 1998 Manuel Bouyer.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 *
 */

/* Hight-level functions and structures used by both ATA and ATAPI devices */

struct ataparams;

/* Datas common to drives and controller drivers */
struct ata_drive_datas {
    u_int8_t drive; /* drive number */
    int8_t ata_vers; /* ATA version supported */
    u_int16_t drive_flags; /* bitmask for drives present/absent and cap */
#define DRIVE_ATA	0x0001
#define DRIVE_ATAPI	0x0002
#define DRIVE_OLD	0x0004 
#define DRIVE (DRIVE_ATA|DRIVE_ATAPI|DRIVE_OLD)
#define DRIVE_CAP32	0x0008
#define DRIVE_DMA	0x0010 
#define DRIVE_UDMA	0x0020
#define DRIVE_MODE	0x0040 /* the drive reported its mode */
#define DRIVE_RESET	0x0080 /* reset the drive state at next xfer */
#define DRIVE_DMAERR	0x0100 /* Udma transfer had crc error, don't try DMA */
#define DRIVE_DSCBA	0x0200 /* DSC in buffer availability mode */
#define DRIVE_DSCWAIT	0x0400 /* In wait for DSC to be asserted */

    /*
     * Current setting of drive's PIO, DMA and UDMA modes.
     * Is initialised by the disks drivers at attach time, and may be
     * changed later by the controller's code if needed
     */
    u_int8_t PIO_mode; /* Current setting of drive's PIO mode */
    u_int8_t DMA_mode; /* Current setting of drive's DMA mode */
    u_int8_t UDMA_mode; /* Current setting of drive's UDMA mode */
    /* Supported modes for this drive */
    u_int8_t PIO_cap; /* supported drive's PIO mode */
    u_int8_t DMA_cap; /* supported drive's DMA mode */
    u_int8_t UDMA_cap; /* supported drive's UDMA mode */
    /*
     * Drive state. This is drive-type (ATA or ATAPI) dependant
     * This is reset to 0 after a channel reset.
     */
    u_int8_t state;

#define ACAP_LEN            0x01  /* 16 byte commands */
#define ACAP_DSC            0x02  /* use DSC signalling */
    /* 0x20-0x40 reserved for ATAPI_CFG_DRQ_MASK */
    u_int8_t atapi_cap;

    /* Number of DMA errors. Reset to 0 after every successful transfers. */
    u_int8_t n_dmaerrs;
    /* downgrade mode after this many successive errors */
#define NERRS_MAX 2

    char drive_name[31];
    int  cf_flags;
    void *chnl_softc; /* channel softc */
};

/* ATA/ATAPI common attachement datas */
struct ata_atapi_attach {
    u_int8_t aa_type; /* Type of device */
#define T_ATA 0
#define T_ATAPI 1
    u_int8_t aa_channel; /* controller's channel */
    u_int8_t aa_openings; /* Number of simultaneous commands possible */
    struct ata_drive_datas *aa_drv_data;
    void *aa_bus_private; /* infos specifics to this bus */
};

/* User config flags that force (or disable) the use of a mode */
#define ATA_CONFIG_PIO_MODES	0x0007
#define ATA_CONFIG_PIO_SET	0x0008
#define ATA_CONFIG_PIO_OFF	0
#define ATA_CONFIG_DMA_MODES	0x0070
#define ATA_CONFIG_DMA_SET	0x0080
#define ATA_CONFIG_DMA_DISABLE	0x0070
#define ATA_CONFIG_DMA_OFF	4
#define ATA_CONFIG_UDMA_MODES	0x0700
#define ATA_CONFIG_UDMA_SET	0x0800
#define ATA_CONFIG_UDMA_DISABLE	0x0700
#define ATA_CONFIG_UDMA_OFF	8

/*
 * ATA/ATAPI commands description 
 *
 * This structure defines the interface between the ATA/ATAPI device driver
 * and the controller for short commands. It contains the command's parameter,
 * the len of data's to read/write (if any), and a function to call upon
 * completion.
 * If no sleep is allowed, the driver can poll for command completion.
 * Once the command completed, if the error registed is valid, the flag
 * AT_ERROR is set and the error register value is copied to r_error .
 * A separate interface is needed for read/write or ATAPI packet commands
 * (which need multiple interrupts per commands).
 */
struct wdc_command {
    u_int8_t r_command;  /* Parameters to upload to registers */
    u_int8_t r_head;
    u_int16_t r_cyl;
    u_int8_t r_sector;
    u_int8_t r_count;
    u_int8_t r_precomp;
    u_int8_t r_st_bmask; /* status register mask to wait for before command */
    u_int8_t r_st_pmask; /* status register mask to wait for after command */
    u_int8_t r_error;    /* error register after command done */
    volatile u_int16_t flags;
#define AT_READ     0x0001 /* There is data to read */
#define AT_WRITE    0x0002 /* There is data to write (excl. with AT_READ) */
#define AT_WAIT     0x0008 /* wait in controller code for command completion */
#define AT_POLL     0x0010 /* poll for command completion (no interrupts) */
#define AT_DONE     0x0020 /* command is done */
#define AT_ERROR    0x0040 /* command is done with error */
#define AT_TIMEOU   0x0080 /* command timed out */
#define AT_DF       0x0100 /* Drive fault */
#define AT_READREG  0x0200 /* Read registers on completion */
    int timeout;	 /* timeout (in ms) */
    void *data;          /* Data buffer address */
    int bcount;           /* number of bytes to transfer */
    void (*callback) __P((void*)); /* command to call once command completed */
    void *callback_arg;  /* argument passed to *callback() */
};

extern int at_poll;

int wdc_exec_command __P((struct ata_drive_datas *, struct wdc_command*));
#define WDC_COMPLETE 0x01
#define WDC_QUEUED   0x02
#define WDC_TRY_AGAIN 0x03

void wdc_probe_caps __P((struct ata_drive_datas*, struct ataparams *));
void wdc_print_caps __P((struct ata_drive_datas*));
int  wdc_downgrade_mode __P((struct ata_drive_datas*));

void wdc_reset_channel __P((struct ata_drive_datas *));

int wdc_ata_addref __P((struct ata_drive_datas *));
void wdc_ata_delref __P((struct ata_drive_datas *));

struct ataparams;
int ata_get_params __P((struct ata_drive_datas*, u_int8_t,
	 struct ataparams *));
int ata_set_mode __P((struct ata_drive_datas*, u_int8_t, u_int8_t));
/* return code for these cmds */
#define CMD_OK    0
#define CMD_ERR   1
#define CMD_AGAIN 2

void ata_perror __P((struct ata_drive_datas *, int, char *));
