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/*

        pg.c    (c) 1998  Grant R. Guenther <grant@torque.net>

                          Under the terms of the GNU public license.

        Special 2.0.35 version

        The pg driver provides a simple character device interface for

        sending ATAPI commands to a device.  With the exception of the

        ATAPI reset operation, all operations are performed by a pair

        of read and write operations to the appropriate /dev/pgN device.

        A write operation delivers a command and any outbound data in

        a single buffer.  Normally, the write will succeed unless the

        device is offline or malfunctioning, or there is already another

        command pending.  If the write succeeds, it should be followed

        immediately by a read operation, to obtain any returned data and

        status information.  A read will fail if there is no operation

        in progress.

        As a special case, the device can be reset with a write operation,

        and in this case, no following read is expected, or permitted.

        There are no ioctl() operations.  Any single operation

        may transfer at most PG_MAX_DATA bytes.  Note that the driver must

        copy the data through an internal buffer.  In keeping with all

        current ATAPI devices, command packets are assumed to be exactly

        12 bytes in length.

        To permit future changes to this interface, the headers in the

        read and write buffers contain a single character "magic" flag.

        Currently this flag must be the character "P".

        By default, the driver will autoprobe for a single parallel

        port ATAPI device, but if their individual parameters are

        specified, the driver can handle up to 4 devices.

        To use this device, you must have the following device

        special files defined:

                /dev/pg0 c 97 0

                /dev/pg1 c 97 1

                /dev/pg2 c 97 2

                /dev/pg3 c 97 3

        (You'll need to change the 97 to something else if you use

        the 'major' parameter to install the driver on a different

        major number.)

        The behaviour of the pg driver can be altered by setting

        some parameters from the insmod command line.  The following

        parameters are adjustable:

            drive0      These four arguments can be arrays of

            drive1      1-6 integers as follows:

            drive2

            drive3      <prt>,<pro>,<uni>,<mod>,<slv>,<dly>

                        Where,

                <prt>   is the base of the parallel port address for

                        the corresponding drive.  (required)

                <pro>   is the protocol number for the adapter that

                        supports this drive.  These numbers are

                        logged by 'paride' when the protocol modules

                        are initialised.  (0 if not given)

                <uni>   for those adapters that support chained

                        devices, this is the unit selector for the

                        chain of devices on the given port.  It should

                        be zero for devices that don't support chaining.

                        (0 if not given)

                <mod>   this can be -1 to choose the best mode, or one

                        of the mode numbers supported by the adapter.

                        (-1 if not given)

                <slv>   ATAPI devices can be jumpered to master or slave.

                        Set this to 0 to choose the master drive, 1 to

                        choose the slave, -1 (the default) to choose the

                        first drive found.

                <dly>   some parallel ports require the driver to

                        go more slowly.  -1 sets a default value that

                        should work with the chosen protocol.  Otherwise,

                        set this to a small integer, the larger it is

                        the slower the port i/o.  In some cases, setting

                        this to zero will speed up the device. (default -1)

            major       You may use this parameter to overide the

                        default major number (97) that this driver

                        will use.  Be sure to change the device

                        name as well.

            name        This parameter is a character string that

                        contains the name the kernel will use for this

                        device (in /proc output, for instance).

                        (default "pg").

            verbose     This parameter controls the amount of logging

                        that is done by the driver.  Set it to 0 for

                        quiet operation, to 1 to enable progress

                        messages while the driver probes for devices,

                        or to 2 for full debug logging.  (default 0)

        If this driver is built into the kernel, you can use

        the following command line parameters, with the same values

        as the corresponding module parameters listed above:

            pg.drive0

            pg.drive1

            pg.drive2

            pg.drive3

        In addition, you can use the parameter pg.disable to disable

        the driver entirely.

*/

/* Changes:

        1.01    GRG 1998.06.16  Bug fixes

        1.02    GRG 1998.09.24  Added jumbo support

*/

#define PG_VERSION      "1.02s"

#define PG_MAJOR        97

#define PG_NAME         "pg"

#define PG_UNITS        4

#ifndef PI_PG

#define PI_PG   4

#endif

/* Here are things one can override from the insmod command.

   Most are autoprobed by paride unless set here.  Verbose is 0

   by default.

*/

static int      verbose = 0;

static int      major = PG_MAJOR;

static char     *name = PG_NAME;

static int      disable = 0;

static int drive0[6] = {0,0,0,-1,-1,-1};

static int drive1[6] = {0,0,0,-1,-1,-1};

static int drive2[6] = {0,0,0,-1,-1,-1};

static int drive3[6] = {0,0,0,-1,-1,-1};

static int (*drives[4])[6] = {&drive0,&drive1,&drive2,&drive3};

static int pg_drive_count;

#define D_PRT   0

#define D_PRO   1

#define D_UNI   2

#define D_MOD   3

#define D_SLV   4

#define D_DLY   5

#define DU              (*drives[unit])

/* end of parameters */

#include <linux/module.h>

#include <linux/errno.h>

#include <linux/fs.h>

#include <linux/kernel.h>

#include <linux/delay.h>

#include <linux/malloc.h>

#include <linux/mtio.h>

#include <linux/pg.h>

#include <asm/segment.h>

#ifndef MODULE

#include "setup.h"

static STT pg_stt[5] = {{"drive0",6,drive0},

                        {"drive1",6,drive1},

                        {"drive2",6,drive2},

                        {"drive3",6,drive3},

                        {"disable",1,&disable}};

void pg_setup( char *str, int *ints)

{       generic_setup(pg_stt,5,str);

}

#endif

#include "paride.h"

#define PG_SPIN_DEL     50              /* spin delay in micro-seconds  */

#define PG_SPIN         200

#define PG_TMO          HZ

#define PG_CMD_TMO      3*HZ

#define PG_RESET_TMO    10*HZ

#define STAT_ERR        0x01

#define STAT_INDEX      0x02

#define STAT_ECC        0x04

#define STAT_DRQ        0x08

#define STAT_SEEK       0x10

#define STAT_WRERR      0x20

#define STAT_READY      0x40

#define STAT_BUSY       0x80

#define ATAPI_IDENTIFY          0x12

int pg_init(void);

#ifdef MODULE

void cleanup_module( void );

#endif

static int pg_open(struct inode *inode, struct file *file);

static void pg_release (struct inode *inode, struct file *file);

static int pg_read(struct inode *inode, struct file *filp, char *buf, int count);

static int pg_write(struct inode *inode, struct file *filp,

                        const char *buf, int count);

static int pg_detect(void);

static int pg_identify (int unit, int log);

#define PG_NAMELEN      8

struct pg_unit {

        struct pi_adapter pia;    /* interface to paride layer */

        struct pi_adapter *pi;

        int busy;                 /* write done, read expected */

        int start;                /* jiffies at command start */

        int dlen;                 /* transfer size requested */

        int timeout;              /* timeout requested */

        int status;               /* last sense key */

        int drive;                /* drive */

        int access;               /* count of active opens ... */

        int present;              /* device present ? */

        char *bufptr;

        char name[PG_NAMELEN];    /* pg0, pg1, ... */

        };

struct pg_unit pg[PG_UNITS];

/*  'unit' must be defined in all functions - either as a local or a param */

#define PG pg[unit]

#define PI PG.pi

static char pg_scratch[512];            /* scratch block buffer */

/* kernel glue structures */

static struct file_operations pg_fops = {

        NULL,                   /* lseek - default */

        pg_read,                /* read */

        pg_write,               /* write */

        NULL,                   /* readdir - bad */

        NULL,                   /* select */

        NULL,                   /* ioctl */

        NULL,                   /* mmap */

        pg_open,                /* open */

        pg_release,             /* release */

        NULL,                   /* fsync */

        NULL,                   /* fasync */

        NULL,                   /* media change ? */

        NULL                    /* revalidate new media */

};

void pg_init_units( void )

{       int     unit, j;

        pg_drive_count = 0;

        for (unit=0;unit<PG_UNITS;unit++) {

                PG.pi = & PG.pia;

                PG.access = 0;

                PG.busy = 0;

                PG.present = 0;

                PG.bufptr = NULL;

                PG.drive = DU[D_SLV];

                j = 0;

                while ((j < PG_NAMELEN-2) && (PG.name[j]=name[j])) j++;

                PG.name[j++] = '0' + unit;

                PG.name[j] = 0;

                if (DU[D_PRT]) pg_drive_count++;

        }

}

int pg_init (void)      /* preliminary initialisation */

{       int unit;

        if (disable) return -1;

        pg_init_units();

        if (pg_detect()) return -1;

        if (register_chrdev(major,name,&pg_fops)) {

                printk("pg_init: unable to get major number %d\n",

                        major);

                for (unit=0;unit<PG_UNITS;unit++)

                  if (PG.present) pi_release(PI);

                return -1;

        }

        return 0;

}

#ifdef MODULE

/* Glue for modules ... */

void    cleanup_module(void);

int     init_module(void)

{       int     err;

#ifdef PARIDE_JUMBO

       { extern paride_init();

         paride_init();

       }

#endif

        err = pg_init();

        return err;

}

void    cleanup_module(void)

{       int unit;

        unregister_chrdev(major,name);

        for (unit=0;unit<PG_UNITS;unit++)

          if (PG.present) pi_release(PI);

}

#endif

#define WR(c,r,v)       pi_write_regr(PI,c,r,v)

#define RR(c,r)         (pi_read_regr(PI,c,r))

#define DRIVE           (0xa0+0x10*PG.drive)

static void pg_sleep( int cs )

{       current->state = TASK_INTERRUPTIBLE;

        current->timeout = jiffies + cs;

        schedule();

}

static int pg_wait( int unit, int go, int stop, int tmo, char * msg )

{       int j, r, e, s, p;

        PG.status = 0;

        j = 0;

        while ((((r=RR(1,6))&go)||(stop&&(!(r&stop))))&&(jiffies<tmo)) {

                if (j++ < PG_SPIN) udelay(PG_SPIN_DEL);

                else pg_sleep(1);

        }

        if ((r&(STAT_ERR&stop))||(jiffies>=tmo)) {

           s = RR(0,7);

           e = RR(0,1);

           p = RR(0,2);

           if (verbose > 1)

             printk("%s: %s: stat=0x%x err=0x%x phase=%d%s\n",

                   PG.name,msg,s,e,p,(jiffies>=tmo)?" timeout":"");

           if (jiffies>=tmo) e |= 0x100;

           PG.status = (e >> 4) & 0xff;

           return -1;

        }

        return 0;

}

static int pg_command( int unit, char * cmd, int dlen, int tmo )

{       int k;

        pi_connect(PI);

        WR(0,6,DRIVE);

        if (pg_wait(unit,STAT_BUSY|STAT_DRQ,0,tmo,"before command")) {

                pi_disconnect(PI);

                return -1;

        }

        WR(0,4,dlen % 256);

        WR(0,5,dlen / 256);

        WR(0,7,0xa0);          /* ATAPI packet command */

        if (pg_wait(unit,STAT_BUSY,STAT_DRQ,tmo,"command DRQ")) {

                pi_disconnect(PI);

                return -1;

        }

        if (RR(0,2) != 1) {

           printk("%s: command phase error\n",PG.name);

           pi_disconnect(PI);

           return -1;

        }

        pi_write_block(PI,cmd,12);

        if (verbose > 1) {

                printk("%s: Command sent, dlen=%d packet= ", PG.name,dlen);

                for (k=0;k<12;k++) printk("%02x ",cmd[k]&0xff);

                printk("\n");

        }

        return 0;

}

static int pg_completion( int unit, char * buf, int tmo)

{       int r, d, n, p;

        r = pg_wait(unit,STAT_BUSY,STAT_DRQ|STAT_READY|STAT_ERR,

                        tmo,"completion");

        PG.dlen = 0;

        while (RR(0,7)&STAT_DRQ) {

           d = (RR(0,4)+256*RR(0,5));

           n = ((d+3)&0xfffc);

           p = RR(0,2)&3;

           if (p == 0) pi_write_block(PI,buf,n);

           if (p == 2) pi_read_block(PI,buf,n);

           if (verbose > 1) printk("%s: %s %d bytes\n",PG.name,

                                    p?"Read":"Write",n);

           PG.dlen += (1-p)*d;

           buf += d;

           r = pg_wait(unit,STAT_BUSY,STAT_DRQ|STAT_READY|STAT_ERR,

                        tmo,"completion");

        }

        pi_disconnect(PI);

        return r;

}

static int pg_reset( int unit )

{       int     i, k, flg;

        int     expect[5] = {1,1,1,0x14,0xeb};

        pi_connect(PI);

        WR(0,6,DRIVE);

        WR(0,7,8);

        pg_sleep(2);

        k = 0;

        while ((k++ < PG_RESET_TMO) && (RR(1,6)&STAT_BUSY))

                pg_sleep(1);

        flg = 1;

        for(i=0;i<5;i++) flg &= (RR(0,i+1) == expect[i]);

        if (verbose) {

                printk("%s: Reset (%d) signature = ",PG.name,k);

                for (i=0;i<5;i++) printk("%3x",RR(0,i+1));

                if (!flg) printk(" (incorrect)");

                printk("\n");

        }

        pi_disconnect(PI);

        return flg-1;

}

static void xs( char *buf, char *targ, int offs, int len )

{       int     j,k,l;

        j=0; l=0;

        for (k=0;k<len;k++)

           if((buf[k+offs]!=0x20)||(buf[k+offs]!=l))

                l=targ[j++]=buf[k+offs];

        if (l==0x20) j--; targ[j]=0;

}

static int pg_identify( int unit, int log )

{       int     s;

        char    *ms[2] = {"master","slave"};

        char    mf[10], id[18];

        char    id_cmd[12] = { ATAPI_IDENTIFY,0,0,0,36,0,0,0,0,0,0,0};

        char    buf[36];

        s = pg_command(unit,id_cmd,36,jiffies+PG_TMO);

        if (s) return -1;

        s = pg_completion(unit,buf,jiffies+PG_TMO);

        if (s) return -1;

        if (log) {

                xs(buf,mf,8,8);

                xs(buf,id,16,16);

                printk("%s: %s %s, %s\n",PG.name,mf,id,ms[PG.drive]);

        }

        return 0;

}

static int pg_probe( int unit )

/*      returns  0, with id set if drive is detected

                -1, if drive detection failed

*/

{       if (PG.drive == -1) {

           for (PG.drive=0;PG.drive<=1;PG.drive++)

                if (!pg_reset(unit)) return pg_identify(unit,1);

        } else {

           if (!pg_reset(unit)) return pg_identify(unit,1);

        }

        return -1;

}

static int pg_detect( void )

{       int     k, unit;

        printk("%s: %s version %s, major %d\n",

                name,name,PG_VERSION,major);

        k = 0;

        if (pg_drive_count == 0) {

            unit = 0;

            if (pi_init(PI,1,-1,-1,-1,-1,-1,pg_scratch,

                        PI_PG,verbose,PG.name)) {

                if (!pg_probe(unit)) {

                        PG.present = 1;

                        k++;

                } else pi_release(PI);

            }

        } else for (unit=0;unit<PG_UNITS;unit++) if (DU[D_PRT])

            if (pi_init(PI,0,DU[D_PRT],DU[D_MOD],DU[D_UNI],

                        DU[D_PRO],DU[D_DLY],pg_scratch,PI_PG,verbose,

                        PG.name)) {

                if (!pg_probe(unit)) {

                        PG.present = 1;

                        k++;

                } else pi_release(PI);

            }

        if (k) return 0;

        printk("%s: No ATAPI device detected\n",name);

        return -1;

}

#define DEVICE_NR(dev)  (MINOR(dev) % 128)

static int pg_open (struct inode *inode, struct file *file)

{       int     unit = DEVICE_NR(inode->i_rdev);

        if ((unit >= PG_UNITS) || (!PG.present)) return -ENODEV;

        PG.access++;

        if (PG.access > 1) {

                PG.access--;

                return -EBUSY;

        }

        MOD_INC_USE_COUNT;

        if (PG.busy) {

                pg_reset(unit);

                PG.busy = 0;

        }

        pg_identify(unit,(verbose>1));

        PG.bufptr = kmalloc(PG_MAX_DATA,GFP_KERNEL);

        if (PG.bufptr == NULL) {

                PG.access--;

                MOD_DEC_USE_COUNT;

                printk("%s: buffer allocation failed\n",PG.name);

                return -ENOMEM;

        }

        return 0;

}

static void pg_release (struct inode *inode, struct file *file)

{

        int     unit = DEVICE_NR(inode->i_rdev);

        if ((unit >= PG_UNITS) || (PG.access <= 0))

                return;

        PG.access--;

        kfree(PG.bufptr);

        PG.bufptr = NULL;

        MOD_DEC_USE_COUNT;

}

static int pg_write(struct inode *inode, struct file *filp,

                const char *buf, int count)

{       int                     unit = DEVICE_NR(inode->i_rdev);

        struct pg_write_hdr     hdr;

        int                     hs = sizeof(hdr);

        if (PG.busy) return -EBUSY;

        if (count < hs) return -EINVAL;

        memcpy_fromfs((char *)&hdr,buf,hs);

        if (hdr.magic != PG_MAGIC) return -EINVAL;

        if (hdr.dlen > PG_MAX_DATA) return -EINVAL;

        if ((count - hs) > PG_MAX_DATA) return -EINVAL;

        if (hdr.func == PG_RESET) {

                if (count != hs) return -EINVAL;

                if (pg_reset(unit)) return -EIO;

                return count;

        }

        if (hdr.func != PG_COMMAND) return -EINVAL;

        PG.start = jiffies;

        PG.timeout = hdr.timeout*HZ + HZ/2 + jiffies;

        if (pg_command(unit,hdr.packet,hdr.dlen,jiffies+PG_CMD_TMO)) {

                if (PG.status & 0x10) return -ETIME;

                return -EIO;

        }

        PG.busy = 1;

        memcpy_fromfs(PG.bufptr,buf+hs,count-hs);

        return count;

}

static int pg_read(struct inode *inode, struct file *filp, char *buf, int count)