aten.c
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上传日期:2013-04-10
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文件大小:4k
- /*
- aten.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
- Under the terms of the GNU General Public License.
- aten.c is a low-level protocol driver for the ATEN EH-100
- parallel port adapter. The EH-100 supports 4-bit and 8-bit
- modes only. There is also an EH-132 which supports EPP mode
- transfers. The EH-132 is not yet supported.
- */
- /* Changes:
- 1.01 GRG 1998.05.05 init_proto, release_proto
- */
- #define ATEN_VERSION "1.01"
- #include <linux/module.h>
- #include <linux/delay.h>
- #include <linux/kernel.h>
- #include <linux/wait.h>
- #include <linux/types.h>
- #include <asm/io.h>
- #include "paride.h"
- #define j44(a,b) ((((a>>4)&0x0f)|(b&0xf0))^0x88)
- /* cont = 0 - access the IDE register file
- cont = 1 - access the IDE command set
- */
- static int cont_map[2] = { 0x08, 0x20 };
- static void aten_write_regr( PIA *pi, int cont, int regr, int val)
- { int r;
- r = regr + cont_map[cont] + 0x80;
- w0(r); w2(0xe); w2(6); w0(val); w2(7); w2(6); w2(0xc);
- }
- static int aten_read_regr( PIA *pi, int cont, int regr )
- { int a, b, r;
- r = regr + cont_map[cont] + 0x40;
- switch (pi->mode) {
- case 0: w0(r); w2(0xe); w2(6);
- w2(7); w2(6); w2(0);
- a = r1(); w0(0x10); b = r1(); w2(0xc);
- return j44(a,b);
- case 1: r |= 0x10;
- w0(r); w2(0xe); w2(6); w0(0xff);
- w2(0x27); w2(0x26); w2(0x20);
- a = r0();
- w2(0x26); w2(0xc);
- return a;
- }
- return -1;
- }
- static void aten_read_block( PIA *pi, char * buf, int count )
- { int k, a, b, c, d;
- switch (pi->mode) {
- case 0: w0(0x48); w2(0xe); w2(6);
- for (k=0;k<count/2;k++) {
- w2(7); w2(6); w2(2);
- a = r1(); w0(0x58); b = r1();
- w2(0); d = r1(); w0(0x48); c = r1();
- buf[2*k] = j44(c,d);
- buf[2*k+1] = j44(a,b);
- }
- w2(0xc);
- break;
- case 1: w0(0x58); w2(0xe); w2(6);
- for (k=0;k<count/2;k++) {
- w2(0x27); w2(0x26); w2(0x22);
- a = r0(); w2(0x20); b = r0();
- buf[2*k] = b; buf[2*k+1] = a;
- }
- w2(0x26); w2(0xc);
- break;
- }
- }
- static void aten_write_block( PIA *pi, char * buf, int count )
- { int k;
- w0(0x88); w2(0xe); w2(6);
- for (k=0;k<count/2;k++) {
- w0(buf[2*k+1]); w2(0xe); w2(6);
- w0(buf[2*k]); w2(7); w2(6);
- }
- w2(0xc);
- }
- static void aten_connect ( PIA *pi )
- { pi->saved_r0 = r0();
- pi->saved_r2 = r2();
- w2(0xc);
- }
- static void aten_disconnect ( PIA *pi )
- { w0(pi->saved_r0);
- w2(pi->saved_r2);
- }
- static void aten_log_adapter( PIA *pi, char * scratch, int verbose )
- { char *mode_string[2] = {"4-bit","8-bit"};
- printk("%s: aten %s, ATEN EH-100 at 0x%x, ",
- pi->device,ATEN_VERSION,pi->port);
- printk("mode %d (%s), delay %dn",pi->mode,
- mode_string[pi->mode],pi->delay);
- }
- static void aten_init_proto( PIA *pi )
- { MOD_INC_USE_COUNT;
- }
- static void aten_release_proto( PIA *pi )
- { MOD_DEC_USE_COUNT;
- }
- struct pi_protocol aten = {"aten",0,2,2,1,1,
- aten_write_regr,
- aten_read_regr,
- aten_write_block,
- aten_read_block,
- aten_connect,
- aten_disconnect,
- 0,
- 0,
- 0,
- aten_log_adapter,
- aten_init_proto,
- aten_release_proto
- };
- #ifdef MODULE
- int init_module(void)
- { return pi_register( &aten ) - 1;
- }
- void cleanup_module(void)
- { pi_unregister( &aten );
- }
- #endif
- /* end of aten.c */
- MODULE_LICENSE("GPL");