/*         comm.c    (c) 1997-8  Grant R. Guenther <grant@torque.net>                              Under the terms of the GNU General Public License. 	comm.c is a low-level protocol driver for some older models	of the DataStor "Commuter" parallel to IDE adapter.  Some of	the parallel port devices marketed by Arista currently	use this adapter.*/ /* Changes: 	1.01	GRG 1998.05.05  init_proto, release_proto */ #define COMM_VERSION      "1.01" #include <linux/module.h>#include <linux/init.h>#include <linux/delay.h>#include <linux/kernel.h>#include <linux/types.h>#include <linux/wait.h>#include <asm/io.h> #include "paride.h" /* mode codes:  0  nybble reads, 8-bit writes                1  8-bit reads and writes                2  8-bit EPP mode*/ #define j44(a,b)	(((a>>3)&0x0f)|((b<<1)&0xf0)) #define P1	w2(5);w2(0xd);w2(0xd);w2(5);w2(4);#define P2	w2(5);w2(7);w2(7);w2(5);w2(4); /* cont = 0 - access the IDE register file    cont = 1 - access the IDE command set */ static int  cont_map[2] = { 0x08, 0x10 }; static int comm_read_regr( PIA *pi, int cont, int regr ) {       int     l, h, r;         r = regr + cont_map[cont];         switch (pi->mode)  {         case 0: w0(r); P1; w0(0);        	w2(6); l = r1(); w0(0x80); h = r1(); w2(4);                return j44(l,h);         case 1: w0(r+0x20); P1;         	w0(0); w2(0x26); h = r0(); w2(4);                return h; 	case 2:	case 3:        case 4: w3(r+0x20); (void)r1();        	w2(0x24); h = r4(); w2(4);                return h;         }        return -1;}        static void comm_write_regr( PIA *pi, int cont, int regr, int val ) {       int  r;         r = regr + cont_map[cont];         switch (pi->mode)  {         case 0:        case 1: w0(r); P1; w0(val); P2;		break; 	case 2:	case 3:        case 4: w3(r); (void)r1(); w4(val);                break;        }} static void comm_connect ( PIA *pi  ) {       pi->saved_r0 = r0();        pi->saved_r2 = r2();        w2(4); w0(0xff); w2(6);        w2(4); w0(0xaa); w2(6);        w2(4); w0(0x00); w2(6);        w2(4); w0(0x87); w2(6);        w2(4); w0(0xe0); w2(0xc); w2(0xc); w2(4);} static void comm_disconnect ( PIA *pi ) {       w2(0); w2(0); w2(0); w2(4); 	w0(pi->saved_r0);        w2(pi->saved_r2);}  static void comm_read_block( PIA *pi, char * buf, int count ) {       int     i, l, h;         switch (pi->mode) {                case 0: w0(0x48); P1;                for(i=0;i<count;i++) {                        w0(0); w2(6); l = r1();                        w0(0x80); h = r1(); w2(4);                        buf[i] = j44(l,h);                }                break;         case 1: w0(0x68); P1; w0(0);                for(i=0;i<count;i++) {                        w2(0x26); buf[i] = r0(); w2(0x24);                }		w2(4);		break;			case 2: w3(0x68); (void)r1(); w2(0x24);		for (i=0;i<count;i++) buf[i] = r4();		w2(4);		break;         case 3: w3(0x68); (void)r1(); w2(0x24);                for (i=0;i<count/2;i++) ((u16 *)buf)[i] = r4w();                w2(4);                break;         case 4: w3(0x68); (void)r1(); w2(0x24);                for (i=0;i<count/4;i++) ((u32 *)buf)[i] = r4l();                w2(4);                break;			}} /* NB: Watch out for the byte swapped writes ! */ static void comm_write_block( PIA *pi, char * buf, int count ) {       int	k;         switch (pi->mode) {         case 0:        case 1: w0(0x68); P1;        	for (k=0;k<count;k++) {                        w2(5); w0(buf[k^1]); w2(7);                }                w2(5); w2(4);                break;         case 2: w3(0x48); (void)r1();                for (k=0;k<count;k++) w4(buf[k^1]);                break;         case 3: w3(0x48); (void)r1();                for (k=0;k<count/2;k++) w4w(pi_swab16(buf,k));                break;         case 4: w3(0x48); (void)r1();                for (k=0;k<count/4;k++) w4l(pi_swab32(buf,k));                break;          }} static void comm_log_adapter( PIA *pi, char * scratch, int verbose ) {       char    *mode_string[5] = {"4-bit","8-bit","EPP-8","EPP-16","EPP-32"};         printk("%s: comm %s, DataStor Commuter at 0x%x, ",                pi->device,COMM_VERSION,pi->port);        printk("mode %d (%s), delay %d\n",pi->mode,		mode_string[pi->mode],pi->delay); } static struct pi_protocol comm = {	.owner		= THIS_MODULE,	.name		= "comm",	.max_mode	= 5,	.epp_first	= 2,	.default_delay	= 1,	.max_units	= 1,	.write_regr	= comm_write_regr,	.read_regr	= comm_read_regr,	.write_block	= comm_write_block,	.read_block	= comm_read_block,	.connect	= comm_connect,	.disconnect	= comm_disconnect,	.log_adapter	= comm_log_adapter,}; static int __init comm_init(void){	return paride_register(&comm);} static void __exit comm_exit(void){	paride_unregister(&comm);} MODULE_LICENSE("GPL");module_init(comm_init)module_exit(comm_exit)