2 bpck.c (c) 1996-8 Grant R. Guenther <grant@torque.net>
3 Under the terms of the GNU General Public License.
5 bpck.c is a low-level protocol driver for the MicroSolutions
6 "backpack" parallel port IDE adapter.
12 1.01 GRG 1998.05.05 init_proto, release_proto, pi->delay
13 1.02 GRG 1998.08.15 default pi->delay returned to 4
17 #define BPCK_VERSION "1.02"
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/delay.h>
22 #include <linux/kernel.h>
23 #include <linux/types.h>
24 #include <linux/wait.h>
32 #define PC pi->private
33 #define r2() (PC=(in_p(2) & 0xff))
34 #define w2(byte) {out_p(2,byte); PC = byte;}
35 #define t2(pat) {PC ^= pat; out_p(2,PC);}
36 #define e2() {PC &= 0xfe; out_p(2,PC);}
37 #define o2() {PC |= 1; out_p(2,PC);}
39 #define j44(l,h) (((l>>3)&0x7)|((l>>4)&0x8)|((h<<1)&0x70)|(h&0x80))
41 /* cont = 0 - access the IDE register file
42 cont = 1 - access the IDE command set
43 cont = 2 - use internal bpck register addressing
46 static int cont_map[3] = { 0x40, 0x48, 0 };
48 static int bpck_read_regr( PIA *pi, int cont, int regr )
52 r = regr + cont_map[cont];
56 case 0: w0(r & 0xf); w0(r); t2(2); t2(4);
62 case 1: w0(r & 0xf); w0(r); t2(2);
70 case 4: w0(r); w2(9); w2(0); w2(0x20);
79 static void bpck_write_regr( PIA *pi, int cont, int regr, int val )
83 r = regr + cont_map[cont];
96 case 4: w0(r); w2(9); w2(0);
97 w0(val); w2(1); w2(3); w2(0);
103 /* These macros access the bpck registers in native addressing */
105 #define WR(r,v) bpck_write_regr(pi,2,r,v)
106 #define RR(r) (bpck_read_regr(pi,2,r))
108 static void bpck_write_block( PIA *pi, char * buf, int count )
115 w0(0x40); t2(2); t2(1);
116 for (i=0;i<count;i++) { w0(buf[i]); t2(4); }
121 w0(0x40); t2(2); t2(1);
122 for (i=0;i<count;i++) { w0(buf[i]); t2(4); }
127 w0(0x40); w2(9); w2(0); w2(1);
128 for (i=0;i<count;i++) w4(buf[i]);
134 w0(0x40); w2(9); w2(0); w2(1);
135 for (i=0;i<count/2;i++) w4w(((u16 *)buf)[i]);
141 w0(0x40); w2(9); w2(0); w2(1);
142 for (i=0;i<count/4;i++) w4l(((u32 *)buf)[i]);
149 static void bpck_read_block( PIA *pi, char * buf, int count )
157 for (i=0;i<count;i++) {
166 w0(0x40); t2(2); t2(0x20);
167 for(i=0;i<count;i++) { t2(4); buf[i] = r0(); }
173 w0(0x40); w2(9); w2(0); w2(0x20);
174 for (i=0;i<count;i++) buf[i] = r4();
180 w0(0x40); w2(9); w2(0); w2(0x20);
181 for (i=0;i<count/2;i++) ((u16 *)buf)[i] = r4w();
187 w0(0x40); w2(9); w2(0); w2(0x20);
188 for (i=0;i<count/4;i++) ((u32 *)buf)[i] = r4l();
196 static int bpck_probe_unit ( PIA *pi )
198 { int o1, o0, f7, id;
203 w2(4); w2(0xe); r2(); t2(2);
206 w0(255-id); w2(4); w0(id);
208 t2(2); t = r1()&0xf8;
209 f7 = ((id % 8) == 7);
210 if ((f7) || (t != o1)) { t2(2); s = r1()&0xf8; }
211 if ((t == o1) && ((!f7) || (s == o1))) {
215 t2(8); w0(0); t2(2); w2(0x4c); w0(o0);
219 static void bpck_connect ( PIA *pi )
221 { pi->saved_r0 = r0();
222 w0(0xff-pi->unit); w2(4); w0(pi->unit);
228 case 0: t2(8); WR(4,0);
231 case 1: t2(8); WR(4,0x10);
236 case 4: w2(0); WR(4,8);
243 if (pi->devtype == PI_PCD) {
244 WR(0x46,0x10); /* fiddle with ESS logic ??? */
253 static void bpck_disconnect ( PIA *pi )
256 if (pi->mode >= 2) { w2(9); w2(0); } else t2(2);
257 w2(0x4c); w0(pi->saved_r0);
260 static void bpck_force_spp ( PIA *pi )
262 /* This fakes the EPP protocol to turn off EPP ... */
264 { pi->saved_r0 = r0();
265 w0(0xff-pi->unit); w2(4); w0(pi->unit);
271 w0(0); w2(1); w2(3); w2(0);
273 w2(0x4c); w0(pi->saved_r0);
278 static int bpck_test_proto( PIA *pi, char * scratch, int verbose )
280 { int i, e, l, h, om;
287 case 0: bpck_connect(pi);
290 for(i=0;i<TEST_LEN;i++) {
298 case 1: bpck_connect(pi);
300 w0(0x13); t2(2); t2(0x20);
301 for(i=0;i<TEST_LEN;i++) { t2(4); buf[i] = r0(); }
308 case 4: om = pi->mode;
317 w0(0x13); w2(9); w2(1); w0(0); w2(3); w2(0); w2(0xe0);
320 case 2: for (i=0;i<TEST_LEN;i++) buf[i] = r4();
322 case 3: for (i=0;i<TEST_LEN/2;i++) ((u16 *)buf)[i] = r4w();
324 case 4: for (i=0;i<TEST_LEN/4;i++) ((u32 *)buf)[i] = r4l();
337 printk("%s: bpck: 0x%x unit %d mode %d: ",
338 pi->device,pi->port,pi->unit,pi->mode);
339 for (i=0;i<TEST_LEN;i++) printk("%3d",buf[i]);
344 for (i=0;i<TEST_LEN;i++) if (buf[i] != (i+1)) e++;
348 static void bpck_read_eeprom ( PIA *pi, char * buf )
350 { int i,j,k,n,p,v,f, om, od;
354 om = pi->mode; od = pi->delay;
355 pi->mode = 0; pi->delay = 6;
366 f = (((i + 0x180) & p) != 0) * 2;
379 v = 2*v + (f == 0x84);
397 pi->mode = om; pi->delay = od;
400 static int bpck_test_port ( PIA *pi ) /* check for 8-bit port */
404 w2(0x2c); i = r0(); w0(255-i); r = r0(); w0(i);
407 if (r == (255-i)) m = 0;
409 w2(0xc); i = r0(); w0(255-i); r = r0(); w0(i);
410 if (r != (255-i)) m = -1;
412 if (m == 0) { w2(6); w2(0xc); r = r0(); w0(0xaa); w0(r); w0(0xaa); }
413 if (m == 2) { w2(0x26); w2(0xc); }
415 if (m == -1) return 0;
419 static void bpck_log_adapter( PIA *pi, char * scratch, int verbose )
421 { char *mode_string[5] = { "4-bit","8-bit","EPP-8",
428 bpck_read_eeprom(pi,scratch);
433 if ((scratch[i] < ' ') || (scratch[i] > '~'))
435 printk("%s: bpck EEPROM: %64.64s\n",pi->device,scratch);
436 printk("%s: %64.64s\n",pi->device,&scratch[64]);
440 printk("%s: bpck %s, backpack %8.8s unit %d",
441 pi->device,BPCK_VERSION,&scratch[110],pi->unit);
442 printk(" at 0x%x, mode %d (%s), delay %d\n",pi->port,
443 pi->mode,mode_string[pi->mode],pi->delay);
446 static struct pi_protocol bpck = {
447 .owner = THIS_MODULE,
453 .write_regr = bpck_write_regr,
454 .read_regr = bpck_read_regr,
455 .write_block = bpck_write_block,
456 .read_block = bpck_read_block,
457 .connect = bpck_connect,
458 .disconnect = bpck_disconnect,
459 .test_port = bpck_test_port,
460 .probe_unit = bpck_probe_unit,
461 .test_proto = bpck_test_proto,
462 .log_adapter = bpck_log_adapter,
465 static int __init bpck_init(void)
467 return pi_register(&bpck)-1;
470 static void __exit bpck_exit(void)
472 pi_unregister(&bpck);
475 MODULE_LICENSE("GPL");
476 module_init(bpck_init)
477 module_exit(bpck_exit)