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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/drivers/block/paride/on20.c
15111 views
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/* 

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	on20.c	(c) 1996-8  Grant R. Guenther <[email protected]>

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		            Under the terms of the GNU General Public License.

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        on20.c is a low-level protocol driver for the

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        Onspec 90c20 parallel to IDE adapter. 

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*/

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/* Changes:

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        1.01    GRG 1998.05.06 init_proto, release_proto

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*/

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#define	ON20_VERSION	"1.01"

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#include <linux/module.h>

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#include <linux/init.h>

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#include <linux/delay.h>

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#include <linux/kernel.h>

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#include <linux/types.h>

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#include <linux/wait.h>

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#include <asm/io.h>

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#include "paride.h"

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#define op(f)	w2(4);w0(f);w2(5);w2(0xd);w2(5);w2(0xd);w2(5);w2(4);

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#define vl(v)	w2(4);w0(v);w2(5);w2(7);w2(5);w2(4);

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#define j44(a,b)  (((a>>4)&0x0f)|(b&0xf0))

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/* cont = 0 - access the IDE register file 

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   cont = 1 - access the IDE command set 

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*/

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static int on20_read_regr( PIA *pi, int cont, int regr )

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{	int h,l, r ;

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        r = (regr<<2) + 1 + cont;

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        op(1); vl(r); op(0);

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	switch (pi->mode)  {

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        case 0:  w2(4); w2(6); l = r1();

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                 w2(4); w2(6); h = r1();

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                 w2(4); w2(6); w2(4); w2(6); w2(4);

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		 return j44(l,h);

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	case 1:  w2(4); w2(0x26); r = r0(); 

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                 w2(4); w2(0x26); w2(4);

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		 return r;

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	}

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	return -1;

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}	

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static void on20_write_regr( PIA *pi, int cont, int regr, int val )

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{	int r;

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	r = (regr<<2) + 1 + cont;

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	op(1); vl(r); 

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	op(0); vl(val); 

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	op(0); vl(val);

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}

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static void on20_connect ( PIA *pi)

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{	pi->saved_r0 = r0();

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        pi->saved_r2 = r2();

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	w2(4);w0(0);w2(0xc);w2(4);w2(6);w2(4);w2(6);w2(4); 

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	if (pi->mode) { op(2); vl(8); op(2); vl(9); }

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	       else   { op(2); vl(0); op(2); vl(8); }

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}

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static void on20_disconnect ( PIA *pi )

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{	w2(4);w0(7);w2(4);w2(0xc);w2(4);

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        w0(pi->saved_r0);

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        w2(pi->saved_r2);

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} 

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static void on20_read_block( PIA *pi, char * buf, int count )

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{	int     k, l, h; 

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	op(1); vl(1); op(0);

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

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	    if (pi->mode) {

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		w2(4); w2(0x26); buf[k] = r0();

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	    } else {

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		w2(6); l = r1(); w2(4);

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		w2(6); h = r1(); w2(4);

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		buf[k] = j44(l,h);

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	    }

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	w2(4);

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}

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static void on20_write_block(  PIA *pi, char * buf, int count )

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{	int	k;

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	op(1); vl(1); op(0);

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	for (k=0;k<count;k++) { w2(5); w0(buf[k]); w2(7); }

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	w2(4);

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}

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static void on20_log_adapter( PIA *pi, char * scratch, int verbose )

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{       char    *mode_string[2] = {"4-bit","8-bit"};

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        printk("%s: on20 %s, OnSpec 90c20 at 0x%x, ",

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                pi->device,ON20_VERSION,pi->port);

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        printk("mode %d (%s), delay %d\n",pi->mode,

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		mode_string[pi->mode],pi->delay);

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}

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static struct pi_protocol on20 = {

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	.owner		= THIS_MODULE,

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	.name		= "on20",

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	.max_mode	= 2,

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	.epp_first	= 2,

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	.default_delay	= 1,

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	.max_units	= 1,

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	.write_regr	= on20_write_regr,

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	.read_regr	= on20_read_regr,

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	.write_block	= on20_write_block,

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	.read_block	= on20_read_block,

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	.connect	= on20_connect,

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	.disconnect	= on20_disconnect,

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	.log_adapter	= on20_log_adapter,

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};

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static int __init on20_init(void)

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{

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	return paride_register(&on20);

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}

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static void __exit on20_exit(void)

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{

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	paride_unregister(&on20);

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}

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MODULE_LICENSE("GPL");

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module_init(on20_init)

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module_exit(on20_exit)

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