on20.c
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上传日期:2013-04-10
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- /*
- on20.c (c) 1996-8 Grant R. Guenther <grant@torque.net>
- Under the terms of the GNU General Public License.
- on20.c is a low-level protocol driver for the
- Onspec 90c20 parallel to IDE adapter.
- */
- /* Changes:
- 1.01 GRG 1998.05.06 init_proto, release_proto
- */
- #define ON20_VERSION "1.01"
- #include <linux/module.h>
- #include <linux/delay.h>
- #include <linux/kernel.h>
- #include <linux/types.h>
- #include <linux/wait.h>
- #include <asm/io.h>
- #include "paride.h"
- #define op(f) w2(4);w0(f);w2(5);w2(0xd);w2(5);w2(0xd);w2(5);w2(4);
- #define vl(v) w2(4);w0(v);w2(5);w2(7);w2(5);w2(4);
- #define j44(a,b) (((a>>4)&0x0f)|(b&0xf0))
- /* cont = 0 - access the IDE register file
- cont = 1 - access the IDE command set
- */
- static int on20_read_regr( PIA *pi, int cont, int regr )
- { int h,l, r ;
- r = (regr<<2) + 1 + cont;
- op(1); vl(r); op(0);
- switch (pi->mode) {
- case 0: w2(4); w2(6); l = r1();
- w2(4); w2(6); h = r1();
- w2(4); w2(6); w2(4); w2(6); w2(4);
- return j44(l,h);
- case 1: w2(4); w2(0x26); r = r0();
- w2(4); w2(0x26); w2(4);
- return r;
- }
- return -1;
- }
- static void on20_write_regr( PIA *pi, int cont, int regr, int val )
- { int r;
- r = (regr<<2) + 1 + cont;
- op(1); vl(r);
- op(0); vl(val);
- op(0); vl(val);
- }
- static void on20_connect ( PIA *pi)
- { pi->saved_r0 = r0();
- pi->saved_r2 = r2();
- w2(4);w0(0);w2(0xc);w2(4);w2(6);w2(4);w2(6);w2(4);
- if (pi->mode) { op(2); vl(8); op(2); vl(9); }
- else { op(2); vl(0); op(2); vl(8); }
- }
- static void on20_disconnect ( PIA *pi )
- { w2(4);w0(7);w2(4);w2(0xc);w2(4);
- w0(pi->saved_r0);
- w2(pi->saved_r2);
- }
- static void on20_read_block( PIA *pi, char * buf, int count )
- { int k, l, h;
- op(1); vl(1); op(0);
- for (k=0;k<count;k++)
- if (pi->mode) {
- w2(4); w2(0x26); buf[k] = r0();
- } else {
- w2(6); l = r1(); w2(4);
- w2(6); h = r1(); w2(4);
- buf[k] = j44(l,h);
- }
- w2(4);
- }
- static void on20_write_block( PIA *pi, char * buf, int count )
- { int k;
- op(1); vl(1); op(0);
- for (k=0;k<count;k++) { w2(5); w0(buf[k]); w2(7); }
- w2(4);
- }
- static void on20_log_adapter( PIA *pi, char * scratch, int verbose )
- { char *mode_string[2] = {"4-bit","8-bit"};
- printk("%s: on20 %s, OnSpec 90c20 at 0x%x, ",
- pi->device,ON20_VERSION,pi->port);
- printk("mode %d (%s), delay %dn",pi->mode,
- mode_string[pi->mode],pi->delay);
- }
- static void on20_init_proto( PIA *pi)
- { MOD_INC_USE_COUNT;
- }
- static void on20_release_proto( PIA *pi)
- { MOD_DEC_USE_COUNT;
- }
- struct pi_protocol on20 = {"on20",0,2,2,1,1,
- on20_write_regr,
- on20_read_regr,
- on20_write_block,
- on20_read_block,
- on20_connect,
- on20_disconnect,
- 0,
- 0,
- 0,
- on20_log_adapter,
- on20_init_proto,
- on20_release_proto
- };
- #ifdef MODULE
- int init_module(void)
- { return pi_register( &on20 ) - 1;
- }
- void cleanup_module(void)
- { pi_unregister( &on20 );
- }
- #endif
- /* end of on20.c */
- MODULE_LICENSE("GPL");