dstr.c
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- /*
- dstr.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
- Under the terms of the GNU General Public License.
- dstr.c is a low-level protocol driver for the
- DataStor EP2000 parallel to IDE adapter chip.
- */
- /* Changes:
- 1.01 GRG 1998.05.06 init_proto, release_proto
- */
- #define DSTR_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"
- /* mode codes: 0 nybble reads, 8-bit writes
- 1 8-bit reads and writes
- 2 8-bit EPP mode
- 3 EPP-16
- 4 EPP-32
- */
- #define j44(a,b) (((a>>3)&0x07)|((~a>>4)&0x08)|((b<<1)&0x70)|((~b)&0x80))
- #define P1 w2(5);w2(0xd);w2(5);w2(4);
- #define P2 w2(5);w2(7);w2(5);w2(4);
- #define P3 w2(6);w2(4);w2(6);w2(4);
- /* cont = 0 - access the IDE register file
- cont = 1 - access the IDE command set
- */
- static int cont_map[2] = { 0x20, 0x40 };
- static int dstr_read_regr( PIA *pi, int cont, int regr )
- { int a, b, r;
- r = regr + cont_map[cont];
- w0(0x81); P1;
- if (pi->mode) { w0(0x11); } else { w0(1); }
- P2; w0(r); P1;
- switch (pi->mode) {
- case 0: w2(6); a = r1(); w2(4); w2(6); b = r1(); w2(4);
- return j44(a,b);
- case 1: w0(0); w2(0x26); a = r0(); w2(4);
- return a;
- case 2:
- case 3:
- case 4: w2(0x24); a = r4(); w2(4);
- return a;
- }
- return -1;
- }
- static void dstr_write_regr( PIA *pi, int cont, int regr, int val )
- { int r;
- r = regr + cont_map[cont];
- w0(0x81); P1;
- if (pi->mode >= 2) { w0(0x11); } else { w0(1); }
- P2; w0(r); P1;
-
- switch (pi->mode) {
- case 0:
- case 1: w0(val); w2(5); w2(7); w2(5); w2(4);
- break;
- case 2:
- case 3:
- case 4: w4(val);
- break;
- }
- }
- #define CCP(x) w0(0xff);w2(0xc);w2(4);
- w0(0xaa);w0(0x55);w0(0);w0(0xff);w0(0x87);w0(0x78);
- w0(x);w2(5);w2(4);
- static void dstr_connect ( PIA *pi )
- { pi->saved_r0 = r0();
- pi->saved_r2 = r2();
- w2(4); CCP(0xe0); w0(0xff);
- }
- static void dstr_disconnect ( PIA *pi )
- { CCP(0x30);
- w0(pi->saved_r0);
- w2(pi->saved_r2);
- }
- static void dstr_read_block( PIA *pi, char * buf, int count )
- { int k, a, b;
- w0(0x81); P1;
- if (pi->mode) { w0(0x19); } else { w0(9); }
- P2; w0(0x82); P1; P3; w0(0x20); P1;
- switch (pi->mode) {
- case 0: for (k=0;k<count;k++) {
- w2(6); a = r1(); w2(4);
- w2(6); b = r1(); w2(4);
- buf[k] = j44(a,b);
- }
- break;
- case 1: w0(0);
- for (k=0;k<count;k++) {
- w2(0x26); buf[k] = r0(); w2(0x24);
- }
- w2(4);
- break;
- case 2: w2(0x24);
- for (k=0;k<count;k++) buf[k] = r4();
- w2(4);
- break;
- case 3: w2(0x24);
- for (k=0;k<count/2;k++) ((u16 *)buf)[k] = r4w();
- w2(4);
- break;
- case 4: w2(0x24);
- for (k=0;k<count/4;k++) ((u32 *)buf)[k] = r4l();
- w2(4);
- break;
- }
- }
- static void dstr_write_block( PIA *pi, char * buf, int count )
- { int k;
- w0(0x81); P1;
- if (pi->mode) { w0(0x19); } else { w0(9); }
- P2; w0(0x82); P1; P3; w0(0x20); P1;
- switch (pi->mode) {
- case 0:
- case 1: for (k=0;k<count;k++) {
- w2(5); w0(buf[k]); w2(7);
- }
- w2(5); w2(4);
- break;
- case 2: w2(0xc5);
- for (k=0;k<count;k++) w4(buf[k]);
- w2(0xc4);
- break;
- case 3: w2(0xc5);
- for (k=0;k<count/2;k++) w4w(((u16 *)buf)[k]);
- w2(0xc4);
- break;
- case 4: w2(0xc5);
- for (k=0;k<count/4;k++) w4l(((u32 *)buf)[k]);
- w2(0xc4);
- break;
- }
- }
- static void dstr_log_adapter( PIA *pi, char * scratch, int verbose )
- { char *mode_string[5] = {"4-bit","8-bit","EPP-8",
- "EPP-16","EPP-32"};
- printk("%s: dstr %s, DataStor EP2000 at 0x%x, ",
- pi->device,DSTR_VERSION,pi->port);
- printk("mode %d (%s), delay %dn",pi->mode,
- mode_string[pi->mode],pi->delay);
- }
- static void dstr_init_proto( PIA *pi)
- { MOD_INC_USE_COUNT;
- }
- static void dstr_release_proto( PIA *pi)
- { MOD_DEC_USE_COUNT;
- }
- struct pi_protocol dstr = {"dstr",0,5,2,1,1,
- dstr_write_regr,
- dstr_read_regr,
- dstr_write_block,
- dstr_read_block,
- dstr_connect,
- dstr_disconnect,
- 0,
- 0,
- 0,
- dstr_log_adapter,
- dstr_init_proto,
- dstr_release_proto
- };
- #ifdef MODULE
- int init_module(void)
- { return pi_register( &dstr ) - 1;
- }
- void cleanup_module(void)
- { pi_unregister( &dstr );
- }
- #endif
- /* end of dstr.c */
- MODULE_LICENSE("GPL");