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1.1 root 1: /* ppa.c -- low level driver for the IOMEGA PPA3
2: * parallel port SCSI host adapter.
3: *
4: * (The PPA3 is the embedded controller in the ZIP drive.)
5: *
6: * (c) 1995,1996 Grant R. Guenther, [email protected],
7: * under the terms of the GNU Public License.
8: *
9: * Current Maintainer: David Campbell (Perth, Western Australia)
10: * [email protected]
11: * [email protected]
12: *
13: * My unoffical company acronym list is 21 pages long:
14: * FLA: Four letter acronym with built in facility for
15: * future expansion to five letters.
16: */
17:
18: #include <linux/config.h>
19:
20: /* The following #define is to avoid a clash with hosts.c */
21: #define PPA_CODE 1
22: #ifndef HAVE_PC87332
23: #define HAVE_PC87332 0
24: #endif
25: #define PPA_PROBE_SPP 0x0001
26: #define PPA_PROBE_PS2 0x0002
27: #define PPA_PROBE_ECR 0x0010
28: #define PPA_PROBE_EPP17 0x0100
29: #define PPA_PROBE_EPP19 0x0200
30: int port_probe(unsigned short);
31:
32: #include <linux/blk.h>
33: #include "sd.h"
34: #include "hosts.h"
35: typedef struct {
36: int base; /* Actual port address */
37: int mode; /* Transfer mode */
38: int host; /* Host number (for proc) */
39: Scsi_Cmnd *cur_cmd; /* Current queued command */
40: struct tq_struct ppa_tq; /* Polling interupt stuff */
41: unsigned long jstart; /* Jiffies at start */
42: unsigned failed:1; /* Failure flag */
43: } ppa_struct;
44:
45: #define PPA_EMPTY \
46: {-1, /* base */ \
47: PPA_AUTODETECT, /* mode */ \
48: -1, /* host */ \
49: NULL, /* cur_cmd */ \
50: {0, 0, ppa_interrupt, NULL}, \
51: 0, /* jstart */ \
52: 0 /* failed */ \
53: }
54:
55: #include "ppa.h"
56: #undef CONFIG_PARPORT
57: #define NO_HOSTS 4
58: static ppa_struct ppa_hosts[NO_HOSTS] =
59: {PPA_EMPTY, PPA_EMPTY, PPA_EMPTY, PPA_EMPTY};
60:
61: #define PPA_BASE(x) ppa_hosts[(x)].base
62:
63: int base[NO_HOSTS] =
64: {0x03bc, 0x0378, 0x0278, 0x0000};
65: #define parbus_base base
66: #define parbus_no NO_HOSTS
67:
68: static inline int ppa_pb_claim(int host_no)
69: {
70: if (ppa_hosts[host_no].cur_cmd)
71: ppa_hosts[host_no].cur_cmd->SCp.phase++;
72: return 0;
73: }
74:
75: /***************************************************************************
76: * Parallel port probing routines *
77: ***************************************************************************/
78:
79: #ifndef MODULE
80: /*
81: * Command line parameters (for built-in driver):
82: *
83: * Syntax: ppa=base[,mode[,use_sg]]
84: *
85: * For example: ppa=0x378 or ppa=0x378,0,3
86: *
87: */
88:
89: void ppa_setup(char *str, int *ints)
90: {
91: static int x = 0;
92:
93: if (x == 0) { /* Disable ALL known ports */
94: int i;
95:
96: for (i = 0; i < NO_HOSTS; i++)
97: parbus_base[i] = 0x0000;
98: }
99: switch (ints[0]) {
100: case 3:
101: ppa_sg = ints[3];
102: case 2:
103: ppa_hosts[x].mode = ints[2];
104: parbus_base[x] = ints[1];
105: break;
106: default:
107: printk("PPA: I only use between 2 to 3 parameters.\n");
108: break;
109: }
110: x++;
111: }
112: #else
113: Scsi_Host_Template driver_template = PPA;
114: #include "scsi_module.c"
115: #endif
116:
117: /*
118: * Start of Chipset kludges
119: */
120:
121: #if HAVE_PC87332 > 0
122: #warning PC87332 Kludge code included
123: static inline int pc87332_port(int host_no)
124: {
125: /* A routine to detect and kludge pc87332 chipsets into the
126: * "optimum" mode for parallel port data transfer.
127: * This assumes EPP is better than ECP...
128: * (Which it is for disk drives but not printers and scanners)
129: */
130: int base = ppa_hosts[host_no].base;
131:
132: /* This is where an pc87332 can hide */
133: unsigned short index_addr[4] =
134: {
135: 0x0398, 0x026e, 0x015c, 0x002e
136: };
137:
138: /* Bits 0&1 of FAR (Function Address Register) which specify where
139: * the LPT port will show up at.
140: */
141: unsigned short port_ref[4] =
142: {
143: 0x378, 0x3bc, 0x278, 0xffff
144: };
145:
146: unsigned char a;
147: int loop;
148:
149: for (loop = 0; loop < 4; loop++) {
150: /* Clear the "wax" out of the pc87332, only needed after hard
151: * reset.
152: */
153: inb(index_addr[loop]);
154: inb(index_addr[loop]);
155: inb(index_addr[loop]);
156: inb(index_addr[loop]);
157:
158: /* Anyone home ?? */
159: outb(0xff, index_addr[loop]);
160: a = inb(index_addr[loop]);
161: switch (a) {
162: case (0x0f): /* PC87732 */
163: break;
164: case (0x1f): /* PC87306 */
165: break;
166: case (0x7f): /* PC87??? */
167: break;
168: default:
169: continue;
170: } /* Is this pc87332 on the desired port */
171: outb(0x01, index_addr[loop]);
172: a = inb(index_addr[loop] + 1);
173: if (port_ref[a & 0x03] != base)
174: continue;
175:
176: /* Found a pc87332 */
177: printk("NatSemi PC87332 (or variant) at 0x%04x\n", base);
178:
179: /* Try to enable EPP modes
180: * with hardware data direction
181: */
182: if (base != 0x3bc) {
183: /* EPP 1.9 */
184: outb(0x04, index_addr[loop]);
185: a = inb(index_addr[loop] + 1);
186: printk("Old reg1 = %02x\n", a);
187: /* 0x01 for EPP 1.7, 0x03 for EPP 1.9, 0x0c for ECP */
188: a = (a & 0xf0) | 0x03;
189: outb(a, index_addr[loop] + 1);
190: outb(a, index_addr[loop] + 1);
191:
192: /* Software data direction selection */
193: outb(0x02, index_addr[loop]);
194: a = inb(index_addr[loop] + 1);
195: printk("Old reg2 = %02x\n", a);
196: /* 0x80 for software, 0x00 for hardware */
197: a = (a & 0x7f) | 0x80;
198: outb(a, index_addr[loop] + 1);
199: outb(a, index_addr[loop] + 1);
200: ppa_hosts[host_no].mode = PPA_EPP_32;
201: } else {
202: /* There is not enough address space for the 0x3bc port
203: * to have EPP registers so we will kludge it into an
204: * ECP
205: * port to allow bi-directional byte mode...
206: */
207: /* ECP */
208: outb(0x04, index_addr[loop]);
209: a = inb(index_addr[loop] + 1);
210: a = (a & 0xfb) | 0x06;
211: outb(a, index_addr[loop] + 1);
212: outb(a, index_addr[loop] + 1);
213: ppa_hosts[host_no].mode = PPA_PS2;
214: }
215:
216: outb(0x04, index_addr[loop]);
217: a = inb(index_addr[loop] + 1);
218: return ppa_hosts[host_no].mode;
219: }
220: return 0;
221: }
222: #else
223: #define pc87332_port(x)
224: #endif /* HAVE_PC87332 */
225:
226: static inline int generic_port(int host_no)
227: {
228: /* Generic parallel port detection
229: * This will try to discover if the port is
230: * EPP, ECP, PS/2 or NIBBLE (In that order, approx....)
231: */
232: unsigned int save_ctr, save_ecr, r;
233: int ppb = PPA_BASE(host_no);
234:
235: save_ctr = r_ctr(ppb);
236: save_ecr = r_ecr(ppb);
237: r = port_probe(ppb);
238: w_ecr(ppb, save_ecr);
239: w_ctr(ppb, save_ctr);
240:
241: if (r & PPA_PROBE_SPP)
242: ppa_hosts[host_no].mode = PPA_NIBBLE;
243:
244: if (r & PPA_PROBE_PS2) {
245: ppa_hosts[host_no].mode = PPA_PS2;
246: if (r & PPA_PROBE_ECR)
247: w_ecr(ppb, 0x20);
248: }
249: if ((r & PPA_PROBE_EPP17) || (r & PPA_PROBE_EPP19)) {
250: /* ppa_hosts[host_no].mode = PPA_EPP_32; */
251: if (r & PPA_PROBE_ECR)
252: w_ecr(ppb, 0x80);
253: }
254: return ppa_hosts[host_no].mode;
255: }
256:
257: int ppa_detect(Scsi_Host_Template * host)
258: {
259: struct Scsi_Host *hreg;
260: int ports;
261: int i, nhosts;
262:
263: printk("ppa: Version %s\n", PPA_VERSION);
264: nhosts = 0;
265:
266: for (i = 0; i < parbus_no; i++) {
267: if (parbus_base[i] == 0x0000)
268: continue;
1.1.1.3 ! root 269: ppa_hosts[i].base = parbus_base[i];
1.1 root 270:
271: /* sanity checks */
272: if (check_region(parbus_base[i],
273: (parbus_base[i] == 0x03bc) ? 3 : 8))
274: continue;
275:
276: pc87332_port(i);
277: if (!generic_port(i))
278: continue;
279:
280: if (ppa_init(i))
281: continue;
282:
283: /* now the glue ... */
284: switch (ppa_hosts[i].mode) {
285: case PPA_NIBBLE:
286: case PPA_PS2:
287: ports = 3;
288: break;
289: case PPA_EPP_8:
290: case PPA_EPP_16:
291: case PPA_EPP_32:
292: ports = 8;
293: break;
294: default: /* Never gets here */
295: continue;
296: }
297: request_region(ppa_hosts[i].base, ports, "ppa");
298: host->can_queue = PPA_CAN_QUEUE;
299: host->sg_tablesize = ppa_sg;
300: hreg = scsi_register(host, 0);
301: hreg->io_port = ppa_hosts[i].base;
302: hreg->n_io_port = ports;
303: hreg->dma_channel = -1;
304: hreg->unique_id = i;
305: ppa_hosts[i].host = hreg->host_no;
306: nhosts++;
307: }
308: if (nhosts == 0)
309: return 0;
310: else
311: return 1; /* return number of hosts detected */
312: }
313:
314: /* This is to give the ppa driver a way to modify the timings (and other
315: * parameters) by writing to the /proc/scsi/ppa/0 file.
316: * Very simple method really... (To simple, no error checking :( )
317: * Reason: Kernel hackers HATE having to unload and reload modules for
318: * testing...
319: * Also gives a method to use a script to obtain optimum timings (TODO)
320: */
321:
322: static inline int ppa_strncmp(const char *a, const char *b, int len)
323: {
324: int loop;
325: for (loop = 0; loop < len; loop++)
326: if (a[loop] != b[loop])
327: return 1;
328:
329: return 0;
330: }
331: static inline int ppa_proc_write(int hostno, char *buffer, int length)
332: {
333: unsigned long x;
334:
335: if ((length > 5) && (ppa_strncmp(buffer, "mode=", 5) == 0)) {
336: x = simple_strtoul(buffer + 5, NULL, 0);
337: ppa_hosts[hostno].mode = x;
338: return length;
339: }
340: printk("ppa /proc: invalid variable\n");
341: return (-EINVAL);
342: }
343:
344: int ppa_proc_info(char *buffer, char **start, off_t offset,
345: int length, int hostno, int inout)
346: {
347: int i;
348: int len = 0;
349:
350: for (i = 0; i < 4; i++)
351: if (ppa_hosts[i].host == hostno)
352: break;
353:
354: if (inout)
355: return ppa_proc_write(i, buffer, length);
356:
357: len += sprintf(buffer + len, "Version : %s\n", PPA_VERSION);
358: len += sprintf(buffer + len, "Port : 0x%04x\n", ppa_hosts[i].base);
359: len += sprintf(buffer + len, "Mode : %s\n", PPA_MODE_STRING[ppa_hosts[i].mode]);
360:
361: /* Request for beyond end of buffer */
362: if (offset > len)
363: return 0;
364:
365: *start = buffer + offset;
366: len -= offset;
367: if (len > length)
368: len = length;
369: return len;
370: } /* end of ppa.c */
371: static int device_check(int host_no);
372:
373: #if PPA_DEBUG > 0
374: #define ppa_fail(x,y) printk("ppa: ppa_fail(%i) from %s at line %d\n",\
375: y, __FUNCTION__, __LINE__); ppa_fail_func(x,y);
376: static inline void ppa_fail_func(int host_no, int error_code)
377: #else
378: static inline void ppa_fail(int host_no, int error_code)
379: #endif
380: {
381: /* If we fail a device then we trash status / message bytes */
382: if (ppa_hosts[host_no].cur_cmd) {
383: ppa_hosts[host_no].cur_cmd->result = error_code << 16;
384: ppa_hosts[host_no].failed = 1;
385: }
386: }
387:
388: /*
389: * Wait for the high bit to be set.
390: *
391: * In principle, this could be tied to an interrupt, but the adapter
392: * doesn't appear to be designed to support interrupts. We spin on
393: * the 0x80 ready bit.
394: */
395: static unsigned char ppa_wait(int host_no)
396: {
397: int k;
398: unsigned short ppb = PPA_BASE(host_no);
399: unsigned char r;
400:
401: k = PPA_SPIN_TMO;
402: do {
403: r = r_str(ppb);
404: k--;
405: udelay(1);
406: }
407: while (!(r & 0x80) && (k));
408:
409: /*
410: * return some status information.
411: * Semantics: 0xc0 = ZIP wants more data
412: * 0xd0 = ZIP wants to send more data
413: * 0xe0 = ZIP is expecting SCSI command data
414: * 0xf0 = end of transfer, ZIP is sending status
415: */
416: if (k)
417: return (r & 0xf0);
418:
419: /* Counter expired - Time out occurred */
420: ppa_fail(host_no, DID_TIME_OUT);
421: printk("ppa timeout in ppa_wait\n");
422: return 0; /* command timed out */
423: }
424:
425: /*
426: * output a string, in whatever mode is available, according to the
427: * PPA protocol.
428: */
429: static inline void epp_reset(unsigned short ppb)
430: {
431: int i;
432:
433: i = r_str(ppb);
434: w_str(ppb, i);
435: w_str(ppb, i & 0xfe);
436: }
437:
438: static inline void ecp_sync(unsigned short ppb)
439: {
440: int i;
441:
442: if ((r_ecr(ppb) & 0xe0) != 0x80)
443: return;
444:
445: for (i = 0; i < 100; i++) {
446: if (r_ecr(ppb) & 0x01)
447: return;
448: udelay(5);
449: }
450: printk("ppa: ECP sync failed as data still present in FIFO.\n");
451: }
452:
453: /*
454: * Here is the asm code for the SPP/PS2 protocols for the i386.
455: * This has been optimised for speed on 386/486 machines. There will
456: * be very little improvement on the current 586+ machines as it is the
457: * IO statements which will limit throughput.
458: */
459: #ifdef __i386__
460: #define BYTE_OUT(reg) \
461: " movb " #reg ",%%al\n" \
462: " outb %%al,(%%dx)\n" \
463: " addl $2,%%edx\n" \
464: " movb $0x0e,%%al\n" \
465: " outb %%al,(%%dx)\n" \
466: " movb $0x0c,%%al\n" \
467: " outb %%al,(%%dx)\n" \
468: " subl $2,%%edx\n"
469:
470: static inline int ppa_byte_out(unsigned short base, char *buffer, unsigned int len)
471: {
1.1.1.2 root 472: int i;
473:
474: for (i = len; i; i--) {
475: w_dtr(base, *buffer++);
476: w_ctr(base, 0xe);
477: w_ctr(base, 0xc);
478: }
1.1 root 479: return 1; /* All went well - we hope! */
480: }
481:
482: #define BYTE_IN(reg) \
483: " inb (%%dx),%%al\n" \
484: " movb %%al," #reg "\n" \
485: " addl $2,%%edx\n" \
486: " movb $0x27,%%al\n" \
487: " outb %%al,(%%dx)\n" \
488: " movb $0x25,%%al\n" \
489: " outb %%al,(%%dx)\n" \
490: " subl $2,%%edx\n"
491:
492: static inline int ppa_byte_in(unsigned short base, char *buffer, int len)
493: {
1.1.1.2 root 494: int i;
495:
496: for (i = len; i; i--) {
497: *buffer++ = r_dtr(base);
498: w_ctr(base, 0x27);
499: w_ctr(base, 0x25);
500: }
1.1 root 501: return 1; /* All went well - we hope! */
502: }
503:
504: #define NIBBLE_IN(reg) \
505: " incl %%edx\n" \
506: " movb $0x04,%%al\n" \
507: " outb %%al,(%%dx)\n" \
508: " decl %%edx\n" \
509: " inb (%%dx),%%al\n" \
510: " andb $0xf0,%%al\n" \
511: " movb %%al," #reg "\n" \
512: " incl %%edx\n" \
513: " movb $0x06,%%al\n" \
514: " outb %%al,(%%dx)\n" \
515: " decl %%edx\n" \
516: " inb (%%dx),%%al\n" \
517: " shrb $4,%%al\n" \
518: " orb %%al," #reg "\n"
519:
1.1.1.3 ! root 520: static inline int ppa_nibble_in(unsigned short base, char *buffer, int len)
1.1 root 521: {
1.1.1.2 root 522: for (; len; len--) {
523: unsigned char h;
524:
525: w_ctr(base, 0x4);
526: h = r_str(base) & 0xf0;
527: w_ctr(base, 0x6);
528: *buffer++ = h | ((r_str(base) & 0xf0) >> 4);
529: }
1.1 root 530: return 1; /* All went well - we hope! */
531: }
532: #else /* Old style C routines */
533:
534: static inline int ppa_byte_out(unsigned short base, const char *buffer, int len)
535: {
536: unsigned short ctr_p = base + 2;
537: int i;
538:
539: for (i = len; i; i--) {
540: outb(*buffer++, base);
541: outb(0xe, ctr_p);
542: outb(0xc, ctr_p);
543: }
544: return 1; /* All went well - we hope! */
545: }
546:
547: static inline int ppa_byte_in(unsigned short base, char *buffer, int len)
548: {
549: unsigned short ctr_p = base + 2;
550: int i;
551:
552: for (i = len; i; i--) {
553: *buffer++ = inb(base);
554: outb(0x27, ctr_p);
555: outb(0x25, ctr_p);
556: }
557: return 1; /* All went well - we hope! */
558: }
559:
560: static inline int ppa_nibble_in(unsigned short str_p, char *buffer, int len)
561: {
562: unsigned short ctr_p = str_p + 1;
563: unsigned char h, l;
564: int i;
565:
566: for (i = len; i; i--) {
567: outb(0x4, ctr_p);
568: h = inb(str_p);
569: outb(0x6, ctr_p);
570: l = inb(str_p);
571: *buffer++ = (h & 0xf0) | ((l & 0xf0) >> 4);
572: }
573: return 1; /* All went well - we hope! */
574: }
575: #endif
576:
577: static inline int ppa_epp_out(unsigned short epp_p, unsigned short str_p, const char *buffer, int len)
578: {
579: int i;
580: for (i = len; i; i--) {
581: outb(*buffer++, epp_p);
582: #ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
583: if (inb(str_p) & 0x01)
584: return 0;
585: #endif
586: }
587: return 1;
588: }
589:
590: static int ppa_out(int host_no, char *buffer, int len)
591: {
592: int r;
593: unsigned short ppb = PPA_BASE(host_no);
594:
595: r = ppa_wait(host_no);
596:
597: if ((r & 0x50) != 0x40) {
598: ppa_fail(host_no, DID_ERROR);
599: return 0;
600: }
601: switch (ppa_hosts[host_no].mode) {
602: case PPA_NIBBLE:
603: case PPA_PS2:
604: /* 8 bit output, with a loop */
605: r = ppa_byte_out(ppb, buffer, len);
606: break;
607:
608: case PPA_EPP_32:
609: case PPA_EPP_16:
610: case PPA_EPP_8:
611: epp_reset(ppb);
612: w_ctr(ppb, 0x4);
613: #ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
614: r = ppa_epp_out(ppb + 4, ppb + 1, buffer, len);
615: #else
616: if (!(((long) buffer | len) & 0x03))
617: outsl(ppb + 4, buffer, len >> 2);
618: else
619: outsb(ppb + 4, buffer, len);
620: w_ctr(ppb, 0xc);
621: r = !(r_str(ppb) & 0x01);
622: #endif
623: w_ctr(ppb, 0xc);
624: ecp_sync(ppb);
625: break;
626:
627: default:
628: printk("PPA: bug in ppa_out()\n");
629: r = 0;
630: }
631: return r;
632: }
633:
634: static inline int ppa_epp_in(int epp_p, int str_p, char *buffer, int len)
635: {
636: int i;
637: for (i = len; i; i--) {
638: *buffer++ = inb(epp_p);
639: #ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
640: if (inb(str_p) & 0x01)
641: return 0;
642: #endif
643: }
644: return 1;
645: }
646:
647: static int ppa_in(int host_no, char *buffer, int len)
648: {
649: int r;
650: unsigned short ppb = PPA_BASE(host_no);
651:
652: r = ppa_wait(host_no);
653:
654: if ((r & 0x50) != 0x50) {
655: ppa_fail(host_no, DID_ERROR);
656: return 0;
657: }
658: switch (ppa_hosts[host_no].mode) {
659: case PPA_NIBBLE:
660: /* 4 bit input, with a loop */
661: r = ppa_nibble_in(ppb + 1, buffer, len);
662: w_ctr(ppb, 0xc);
663: break;
664:
665: case PPA_PS2:
666: /* 8 bit input, with a loop */
667: w_ctr(ppb, 0x25);
668: r = ppa_byte_in(ppb, buffer, len);
669: w_ctr(ppb, 0x4);
670: w_ctr(ppb, 0xc);
671: break;
672:
673: case PPA_EPP_32:
674: case PPA_EPP_16:
675: case PPA_EPP_8:
676: epp_reset(ppb);
677: w_ctr(ppb, 0x24);
678: #ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
679: r = ppa_epp_in(ppb + 4, ppb + 1, buffer, len);
680: #else
681: if (!(((long) buffer | len) & 0x03))
682: insl(ppb + 4, buffer, len >> 2);
683: else
684: insb(ppb + 4, buffer, len);
685: w_ctr(ppb, 0x2c);
686: r = !(r_str(ppb) & 0x01);
687: #endif
688: w_ctr(ppb, 0x2c);
689: ecp_sync(ppb);
690: break;
691:
692: default:
693: printk("PPA: bug in ppa_ins()\n");
694: r = 0;
695: break;
696: }
697: return r;
698: }
699:
700: /* end of ppa_io.h */
701: static inline void ppa_d_pulse(unsigned short ppb, unsigned char b)
702: {
703: w_dtr(ppb, b);
704: w_ctr(ppb, 0xc);
705: w_ctr(ppb, 0xe);
706: w_ctr(ppb, 0xc);
707: w_ctr(ppb, 0x4);
708: w_ctr(ppb, 0xc);
709: }
710:
711: static void ppa_disconnect(int host_no)
712: {
713: unsigned short ppb = PPA_BASE(host_no);
714:
715: ppa_d_pulse(ppb, 0);
716: ppa_d_pulse(ppb, 0x3c);
717: ppa_d_pulse(ppb, 0x20);
718: ppa_d_pulse(ppb, 0xf);
719: }
720:
721: static inline void ppa_c_pulse(unsigned short ppb, unsigned char b)
722: {
723: w_dtr(ppb, b);
724: w_ctr(ppb, 0x4);
725: w_ctr(ppb, 0x6);
726: w_ctr(ppb, 0x4);
727: w_ctr(ppb, 0xc);
728: }
729:
730: static inline void ppa_connect(int host_no, int flag)
731: {
732: unsigned short ppb = PPA_BASE(host_no);
733:
734: ppa_c_pulse(ppb, 0);
735: ppa_c_pulse(ppb, 0x3c);
736: ppa_c_pulse(ppb, 0x20);
737: if ((flag == CONNECT_EPP_MAYBE) &&
738: IN_EPP_MODE(ppa_hosts[host_no].mode))
739: ppa_c_pulse(ppb, 0xcf);
740: else
741: ppa_c_pulse(ppb, 0x8f);
742: }
743:
744: static int ppa_select(int host_no, int target)
745: {
746: int k;
747: unsigned short ppb = PPA_BASE(host_no);
748:
749: /*
750: * Bit 6 (0x40) is the device selected bit.
751: * First we must wait till the current device goes off line...
752: */
753: k = PPA_SELECT_TMO;
754: do {
755: k--;
756: } while ((r_str(ppb) & 0x40) && (k));
757: if (!k)
758: return 0;
759:
760: w_dtr(ppb, (1 << target));
761: w_ctr(ppb, 0xe);
762: w_ctr(ppb, 0xc);
763: w_dtr(ppb, 0x80); /* This is NOT the initator */
764: w_ctr(ppb, 0x8);
765:
766: k = PPA_SELECT_TMO;
767: do {
768: k--;
769: }
770: while (!(r_str(ppb) & 0x40) && (k));
771: if (!k)
772: return 0;
773:
774: return 1;
775: }
776:
777: /*
778: * This is based on a trace of what the Iomega DOS 'guest' driver does.
779: * I've tried several different kinds of parallel ports with guest and
780: * coded this to react in the same ways that it does.
781: *
782: * The return value from this function is just a hint about where the
783: * handshaking failed.
784: *
785: */
786: static int ppa_init(int host_no)
787: {
788: int retv;
789: unsigned short ppb = PPA_BASE(host_no);
790:
791: ppa_disconnect(host_no);
792: ppa_connect(host_no, CONNECT_NORMAL);
793:
794: retv = 2; /* Failed */
795:
796: w_ctr(ppb, 0xe);
797: if ((r_str(ppb) & 0x08) == 0x08)
798: retv--;
799:
800: w_ctr(ppb, 0xc);
801: if ((r_str(ppb) & 0x08) == 0x00)
802: retv--;
803:
804: /* This is a SCSI BUS reset signal */
805: if (!retv) {
806: w_dtr(ppb, 0x40);
807: w_ctr(ppb, 0x08);
808: udelay(30);
809: w_ctr(ppb, 0x0c);
810: udelay(1000); /* Allow devices to settle down */
811: }
812: ppa_disconnect(host_no);
813: udelay(1000); /* Another delay to allow devices to settle */
814:
815: if (!retv)
816: retv = device_check(host_no);
817:
818: return retv;
819: }
820:
821: static inline int ppa_send_command(Scsi_Cmnd * cmd)
822: {
823: int host_no = cmd->host->unique_id;
824: int k;
825:
826: w_ctr(PPA_BASE(host_no), 0x0c);
827:
828: for (k = 0; k < cmd->cmd_len; k++)
829: if (!ppa_out(host_no, &cmd->cmnd[k], 1))
830: return 0;
831: return 1;
832: }
833:
834: /*
835: * The bulk flag enables some optimisations in the data transfer loops,
836: * it should be true for any command that transfers data in integral
837: * numbers of sectors.
838: *
839: * The driver appears to remain stable if we speed up the parallel port
840: * i/o in this function, but not elsewhere.
841: */
842: static int ppa_completion(Scsi_Cmnd * cmd)
843: {
844: /* Return codes:
845: * -1 Error
846: * 0 Told to schedule
847: * 1 Finished data transfer
848: */
849: int host_no = cmd->host->unique_id;
850: unsigned short ppb = PPA_BASE(host_no);
851: unsigned long start_jiffies = jiffies;
852:
853: unsigned char r, v;
854: int fast, bulk, status;
855:
856: v = cmd->cmnd[0];
857: bulk = ((v == READ_6) ||
858: (v == READ_10) ||
859: (v == WRITE_6) ||
860: (v == WRITE_10));
861:
862: /*
863: * We only get here if the drive is ready to comunicate,
864: * hence no need for a full ppa_wait.
865: */
866: r = (r_str(ppb) & 0xf0);
867:
868: while (r != (unsigned char) 0xf0) {
869: /*
870: * If we have been running for more than a full timer tick
871: * then take a rest.
872: */
873: if (jiffies > start_jiffies + 1)
874: return 0;
875:
876: if (((r & 0xc0) != 0xc0) || (cmd->SCp.this_residual <= 0)) {
877: ppa_fail(host_no, DID_ERROR);
878: return -1; /* ERROR_RETURN */
879: }
880: /* determine if we should use burst I/O */ fast = (bulk && (cmd->SCp.this_residual >= PPA_BURST_SIZE))
881: ? PPA_BURST_SIZE : 1;
882:
883: if (r == (unsigned char) 0xc0)
884: status = ppa_out(host_no, cmd->SCp.ptr, fast);
885: else
886: status = ppa_in(host_no, cmd->SCp.ptr, fast);
887:
888: cmd->SCp.ptr += fast;
889: cmd->SCp.this_residual -= fast;
890:
891: if (!status) {
892: ppa_fail(host_no, DID_BUS_BUSY);
893: return -1; /* ERROR_RETURN */
894: }
895: if (cmd->SCp.buffer && !cmd->SCp.this_residual) {
896: /* if scatter/gather, advance to the next segment */
897: if (cmd->SCp.buffers_residual--) {
898: cmd->SCp.buffer++;
899: cmd->SCp.this_residual = cmd->SCp.buffer->length;
900: cmd->SCp.ptr = cmd->SCp.buffer->address;
901: }
902: }
903: /* Now check to see if the drive is ready to comunicate */
904: r = (r_str(ppb) & 0xf0);
905: /* If not, drop back down to the scheduler and wait a timer tick */
906: if (!(r & 0x80))
907: return 0;
908: }
909: return 1; /* FINISH_RETURN */
910: }
911:
912: /*
913: * Since the PPA itself doesn't generate interrupts, we use
914: * the scheduler's task queue to generate a stream of call-backs and
915: * complete the request when the drive is ready.
916: */
917: static void ppa_interrupt(void *data)
918: {
919: ppa_struct *tmp = (ppa_struct *) data;
920: Scsi_Cmnd *cmd = tmp->cur_cmd;
921:
922: if (!cmd) {
923: printk("PPA: bug in ppa_interrupt\n");
924: return;
925: }
926: if (ppa_engine(tmp, cmd)) {
927: tmp->ppa_tq.data = (void *) tmp;
928: tmp->ppa_tq.sync = 0;
929: queue_task(&tmp->ppa_tq, &tq_timer);
930: return;
931: }
932: /* Command must of completed hence it is safe to let go... */
933: #if PPA_DEBUG > 0
934: switch ((cmd->result >> 16) & 0xff) {
935: case DID_OK:
936: break;
937: case DID_NO_CONNECT:
938: printk("ppa: no device at SCSI ID %i\n", cmd->target);
939: break;
940: case DID_BUS_BUSY:
941: printk("ppa: BUS BUSY - EPP timeout detected\n");
942: break;
943: case DID_TIME_OUT:
944: printk("ppa: unknown timeout\n");
945: break;
946: case DID_ABORT:
947: printk("ppa: told to abort\n");
948: break;
949: case DID_PARITY:
950: printk("ppa: parity error (???)\n");
951: break;
952: case DID_ERROR:
953: printk("ppa: internal driver error\n");
954: break;
955: case DID_RESET:
956: printk("ppa: told to reset device\n");
957: break;
958: case DID_BAD_INTR:
959: printk("ppa: bad interrupt (???)\n");
960: break;
961: default:
962: printk("ppa: bad return code (%02x)\n", (cmd->result >> 16) & 0xff);
963: }
964: #endif
965:
966: if (cmd->SCp.phase > 1)
967: ppa_disconnect(cmd->host->unique_id);
968:
969: tmp->cur_cmd = 0;
970: cmd->scsi_done(cmd);
971: return;
972: }
973:
974: static int ppa_engine(ppa_struct * tmp, Scsi_Cmnd * cmd)
975: {
976: int host_no = cmd->host->unique_id;
977: unsigned short ppb = PPA_BASE(host_no);
978: unsigned char l = 0, h = 0;
979: int retv;
980:
981: /* First check for any errors that may have occurred
982: * Here we check for internal errors
983: */
984: if (tmp->failed)
985: return 0;
986:
987: switch (cmd->SCp.phase) {
988: case 0: /* Phase 0 - Waiting for parport */
989: if ((jiffies - tmp->jstart) > HZ) {
990: /*
991: * We waited more than a second
992: * for parport to call us
993: */
994: ppa_fail(host_no, DID_BUS_BUSY);
995: return 0;
996: }
997: return 1; /* wait until ppa_wakeup claims parport */
998: case 1: /* Phase 1 - Connected */
999: { /* Perform a sanity check for cable unplugged */
1000: int retv = 2; /* Failed */
1001:
1002: ppa_connect(host_no, CONNECT_EPP_MAYBE);
1003:
1004: w_ctr(ppb, 0xe);
1005: if ((r_str(ppb) & 0x08) == 0x08)
1006: retv--;
1007:
1008: w_ctr(ppb, 0xc);
1009: if ((r_str(ppb) & 0x08) == 0x00)
1010: retv--;
1011:
1012: if (retv)
1013: if ((jiffies - tmp->jstart) > (1 * HZ)) {
1014: printk("ppa: Parallel port cable is unplugged!!\n");
1015: ppa_fail(host_no, DID_BUS_BUSY);
1016: return 0;
1017: } else {
1018: ppa_disconnect(host_no);
1019: return 1; /* Try again in a jiffy */
1020: }
1021: cmd->SCp.phase++;
1022: }
1023:
1024: case 2: /* Phase 2 - We are now talking to the scsi bus */
1025: if (!ppa_select(host_no, cmd->target)) {
1026: ppa_fail(host_no, DID_NO_CONNECT);
1027: return 0;
1028: }
1029: cmd->SCp.phase++;
1030:
1031: case 3: /* Phase 3 - Ready to accept a command */
1032: w_ctr(ppb, 0x0c);
1033: if (!(r_str(ppb) & 0x80))
1034: return 1;
1035:
1036: if (!ppa_send_command(cmd))
1037: return 0;
1038: cmd->SCp.phase++;
1039:
1040: case 4: /* Phase 4 - Setup scatter/gather buffers */
1041: if (cmd->use_sg) {
1042: /* if many buffers are available, start filling the first */
1043: cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer;
1044: cmd->SCp.this_residual = cmd->SCp.buffer->length;
1045: cmd->SCp.ptr = cmd->SCp.buffer->address;
1046: } else {
1047: /* else fill the only available buffer */
1048: cmd->SCp.buffer = NULL;
1049: cmd->SCp.this_residual = cmd->request_bufflen;
1050: cmd->SCp.ptr = cmd->request_buffer;
1051: }
1052: cmd->SCp.buffers_residual = cmd->use_sg;
1053: cmd->SCp.phase++;
1054:
1055: case 5: /* Phase 5 - Data transfer stage */
1056: w_ctr(ppb, 0x0c);
1057: if (!(r_str(ppb) & 0x80))
1058: return 1;
1059:
1060: retv = ppa_completion(cmd);
1061: if (retv == -1)
1062: return 0;
1063: if (retv == 0)
1064: return 1;
1065: cmd->SCp.phase++;
1066:
1067: case 6: /* Phase 6 - Read status/message */
1068: cmd->result = DID_OK << 16;
1069: /* Check for data overrun */
1070: if (ppa_wait(host_no) != (unsigned char) 0xf0) {
1071: ppa_fail(host_no, DID_ERROR);
1072: return 0;
1073: }
1074: if (ppa_in(host_no, &l, 1)) { /* read status byte */
1075: /* Check for optional message byte */
1076: if (ppa_wait(host_no) == (unsigned char) 0xf0)
1077: ppa_in(host_no, &h, 1);
1078: cmd->result = (DID_OK << 16) + (h << 8) + (l & STATUS_MASK);
1079: }
1080: return 0; /* Finished */
1081: break;
1082:
1083: default:
1084: printk("ppa: Invalid scsi phase\n");
1085: }
1086: return 0;
1087: }
1088:
1089: int ppa_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
1090: {
1091: int host_no = cmd->host->unique_id;
1092:
1093: if (ppa_hosts[host_no].cur_cmd) {
1094: printk("PPA: bug in ppa_queuecommand\n");
1095: return 0;
1096: }
1097: ppa_hosts[host_no].failed = 0;
1098: ppa_hosts[host_no].jstart = jiffies;
1099: ppa_hosts[host_no].cur_cmd = cmd;
1100: cmd->scsi_done = done;
1101: cmd->result = DID_ERROR << 16; /* default return code */
1102: cmd->SCp.phase = 0; /* bus free */
1103:
1104: ppa_pb_claim(host_no);
1105:
1106: ppa_hosts[host_no].ppa_tq.data = ppa_hosts + host_no;
1107: ppa_hosts[host_no].ppa_tq.sync = 0;
1108: queue_task(&ppa_hosts[host_no].ppa_tq, &tq_immediate);
1109: mark_bh(IMMEDIATE_BH);
1110:
1111: return 0;
1112: }
1113:
1114: /*
1115: * Apparently the disk->capacity attribute is off by 1 sector
1116: * for all disk drives. We add the one here, but it should really
1117: * be done in sd.c. Even if it gets fixed there, this will still
1118: * work.
1119: */
1120: int ppa_biosparam(Disk * disk, kdev_t dev, int ip[])
1121: {
1122: ip[0] = 0x40;
1123: ip[1] = 0x20;
1124: ip[2] = (disk->capacity + 1) / (ip[0] * ip[1]);
1125: if (ip[2] > 1024) {
1126: ip[0] = 0xff;
1127: ip[1] = 0x3f;
1128: ip[2] = (disk->capacity + 1) / (ip[0] * ip[1]);
1129: if (ip[2] > 1023)
1130: ip[2] = 1023;
1131: }
1132: return 0;
1133: }
1134:
1135: int ppa_abort(Scsi_Cmnd * cmd)
1136: {
1137: /*
1138: * There is no method for aborting commands since Iomega
1139: * have tied the SCSI_MESSAGE line high in the interface
1140: */
1141:
1142: switch (cmd->SCp.phase) {
1143: case 0: /* Do not have access to parport */
1144: case 1: /* Have not connected to interface */
1145: cmd->result = DID_ABORT;
1146: cmd->done(cmd);
1147: return SCSI_ABORT_SUCCESS;
1148: break;
1149: default: /* SCSI command sent, can not abort */
1150: return SCSI_ABORT_BUSY;
1151: break;
1152: }
1153: }
1154:
1155: int ppa_reset(Scsi_Cmnd * cmd, unsigned int x)
1156: {
1157: int host_no = cmd->host->unique_id;
1158: int ppb = PPA_BASE(host_no);
1159:
1160: /*
1161: * PHASE1:
1162: * Bring the interface crashing down on whatever is running
1163: * hopefully this will kill the request.
1164: * Bring back up the interface, reset the drive (and anything
1165: * attached for that manner)
1166: */
1167: if (cmd)
1168: if (cmd->SCp.phase)
1169: ppa_disconnect(cmd->host->unique_id);
1170:
1171: ppa_connect(host_no, CONNECT_NORMAL);
1172: w_dtr(ppb, 0x40);
1173: w_ctr(ppb, 0x8);
1174: udelay(30);
1175: w_ctr(ppb, 0xc);
1176: udelay(1000); /* delay for devices to settle down */
1177: ppa_disconnect(host_no);
1178: udelay(1000); /* Additional delay to allow devices to settle down */
1179:
1180: /*
1181: * PHASE2:
1182: * Sanity check for the sake of mid-level driver
1183: */
1184: if (!cmd) {
1185: printk("ppa bus reset called for invalid command.\n");
1186: return SCSI_RESET_NOT_RUNNING;
1187: }
1188: /*
1189: * PHASE3:
1190: * Flag the current command as having died due to reset
1191: */
1192: ppa_connect(host_no, CONNECT_NORMAL);
1193: ppa_fail(host_no, DID_RESET);
1194:
1195: /* Since the command was already on the timer queue ppa_interrupt
1196: * will be called shortly.
1197: */
1198: return SCSI_RESET_PENDING;
1199: }
1200:
1201: static int device_check(int host_no)
1202: {
1203: /* This routine looks for a device and then attempts to use EPP
1204: to send a command. If all goes as planned then EPP is available. */
1205:
1206: static char cmd[6] =
1207: {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
1208: int loop, old_mode, status, k, ppb = PPA_BASE(host_no);
1209: unsigned char l;
1210:
1211: old_mode = ppa_hosts[host_no].mode;
1212: for (loop = 0; loop < 8; loop++) {
1213: /* Attempt to use EPP for Test Unit Ready */
1214: if ((ppb & 0x0007) == 0x0000)
1215: ppa_hosts[host_no].mode = PPA_EPP_32;
1216:
1217: second_pass:
1218: ppa_connect(host_no, CONNECT_EPP_MAYBE);
1219: /* Select SCSI device */
1220: if (!ppa_select(host_no, loop)) {
1221: ppa_disconnect(host_no);
1222: continue;
1223: }
1224: printk("ppa: Found device at ID %i, Attempting to use %s\n", loop,
1225: PPA_MODE_STRING[ppa_hosts[host_no].mode]);
1226:
1227: /* Send SCSI command */
1228: status = 1;
1229: w_ctr(ppb, 0x0c);
1230: for (l = 0; (l < 6) && (status); l++)
1231: status = ppa_out(host_no, cmd, 1);
1232:
1233: if (!status) {
1234: ppa_disconnect(host_no);
1235: ppa_connect(host_no, CONNECT_EPP_MAYBE);
1236: w_dtr(ppb, 0x40);
1237: w_ctr(ppb, 0x08);
1238: udelay(30);
1239: w_ctr(ppb, 0x0c);
1240: udelay(1000);
1241: ppa_disconnect(host_no);
1242: udelay(1000);
1243: if (ppa_hosts[host_no].mode == PPA_EPP_32) {
1244: ppa_hosts[host_no].mode = old_mode;
1245: goto second_pass;
1246: }
1247: printk("ppa: Unable to establish communication, aborting driver load.\n");
1248: return 1;
1249: }
1250: w_ctr(ppb, 0x0c);
1251: k = 1000000; /* 1 Second */
1252: do {
1253: l = r_str(ppb);
1254: k--;
1255: udelay(1);
1256: } while (!(l & 0x80) && (k));
1257:
1258: l &= 0xf0;
1259:
1260: if (l != 0xf0) {
1261: ppa_disconnect(host_no);
1262: ppa_connect(host_no, CONNECT_EPP_MAYBE);
1263: w_dtr(ppb, 0x40);
1264: w_ctr(ppb, 0x08);
1265: udelay(30);
1266: w_ctr(ppb, 0x0c);
1267: udelay(1000);
1268: ppa_disconnect(host_no);
1269: udelay(1000);
1270: if (ppa_hosts[host_no].mode == PPA_EPP_32) {
1271: ppa_hosts[host_no].mode = old_mode;
1272: goto second_pass;
1273: }
1274: printk("ppa: Unable to establish communication, aborting driver load.\n");
1275: return 1;
1276: }
1277: ppa_disconnect(host_no);
1278: printk("ppa: Communication established with ID %i using %s\n", loop,
1279: PPA_MODE_STRING[ppa_hosts[host_no].mode]);
1280: return 0;
1281: }
1282: printk("ppa: No devices found, aborting driver load.\n");
1283: return 1;
1284: }
1285:
1286: #define PPA_ID "ppa: "
1287:
1288: int port_probe(unsigned short port)
1289: {
1290: int retv = 0;
1291: unsigned char a, b, c;
1292: unsigned int i, j;
1293:
1294:
1295: printk(PPA_ID "Probing port %04x\n", port);
1296:
1297: /* ##### ###### ######
1298: * # # # # # #
1299: * # # # # #
1300: * ##### ###### ######
1301: * # # #
1302: * # # # #
1303: * ##### # #
1304: */
1305:
1306: outb(0x0c, port + 0x402);
1307: outb(0x0c, port + 0x002);
1308: outb(0x55, port);
1309: a = inb(port);
1310: if (a != 0x55)
1311: return retv;
1312: printk(PPA_ID " SPP port present\n");
1313:
1314: retv += PPA_PROBE_SPP;
1315:
1316: /* ####### ##### ######
1317: * # # # # #
1318: * # # # #
1319: * ##### # ######
1320: * # # #
1321: * # # # #
1322: * ####### ##### #
1323: */
1324:
1325: for (i = 1024; i > 0; i--) { /* clear at most 1k of data from FIFO */
1326: a = inb(port + 0x402);
1327: if ((a & 0x03) == 0x03)
1328: goto no_ecp;
1329: if (a & 0x01)
1330: break;
1331: inb(port + 0x400); /* Remove byte from FIFO */
1332: }
1333:
1334: if (i <= 0)
1335: goto no_ecp;
1336:
1337: b = a ^ 3;
1338: outb(b, port + 0x402);
1339: c = inb(port + 0x402);
1340:
1341: if (a == c) {
1342: outb(0xc0, port + 0x402); /* FIFO test */
1343: j = 0;
1344: while (!(inb(port + 0x402) & 0x01) && (j < 1024)) {
1345: inb(port + 0x400);
1346: j++;
1347: }
1348: if (j >= 1024)
1349: goto no_ecp;
1350: i = 0;
1351: j = 0;
1352: while (!(inb(port + 0x402) & 0x02) && (j < 1024)) {
1353: outb(0x00, port + 0x400);
1354: i++;
1355: j++;
1356: }
1357: if (j >= 1024)
1358: goto no_ecp;
1359: j = 0;
1360: while (!(inb(port + 0x402) & 0x01) && (j < 1024)) {
1361: inb(port + 0x400);
1362: j++;
1363: }
1364: if (j >= 1024)
1365: goto no_ecp;
1366: printk(PPA_ID " ECP with a %i byte FIFO present\n", i);
1367:
1368: retv += PPA_PROBE_ECR;
1369: }
1370: /* ###### ##### #####
1371: * # # # # # #
1372: * # # # #
1373: * ###### ##### #####
1374: * # # #
1375: * # # # #
1376: * # ##### #######
1377: */
1378:
1379: no_ecp:
1380: if (retv & PPA_PROBE_ECR)
1381: outb(0x20, port + 0x402);
1382:
1383: outb(0x55, port);
1384: outb(0x0c, port + 2);
1385: a = inb(port);
1386: outb(0x55, port);
1387: outb(0x2c, port + 2);
1388: b = inb(port);
1389: if (a != b) {
1390: printk(PPA_ID " PS/2 bidirectional port present\n");
1391: retv += PPA_PROBE_PS2;
1392: }
1393: /* ####### ###### ######
1394: * # # # # #
1395: * # # # # #
1396: * ##### ###### ######
1397: * # # #
1398: * # # #
1399: * ####### # #
1400: */
1401:
1402: if (port & 0x007) {
1403: printk(PPA_ID " EPP not supported at this address\n");
1404: return retv;
1405: }
1406: if (retv & PPA_PROBE_ECR) {
1407: for (i = 0x00; i < 0x80; i += 0x20) {
1408: outb(i, port + 0x402);
1409:
1410: a = inb(port + 1);
1411: outb(a, port + 1);
1412: outb(a & 0xfe, port + 1);
1413: a = inb(port + 1);
1414: if (!(a & 0x01)) {
1415: printk(PPA_ID " Failed Intel bug check. (Phony EPP in ECP)\n");
1416: return retv;
1417: }
1418: }
1419: printk(PPA_ID " Passed Intel bug check.\n");
1420: outb(0x80, port + 0x402);
1421: }
1422: a = inb(port + 1);
1423: outb(a, port + 1);
1424: outb(a & 0xfe, port + 1);
1425: a = inb(port + 1);
1426:
1427: if (a & 0x01) {
1428: outb(0x0c, port + 0x402);
1429: outb(0x0c, port + 0x002);
1430: return retv;
1431: }
1432:
1433: outb(0x04, port + 2);
1434: inb(port + 4);
1435: a = inb(port + 1);
1436: outb(a, port + 1);
1437: outb(a & 0xfe, port + 1);
1438:
1439: if (a & 0x01) {
1440: printk(PPA_ID " EPP 1.9 with hardware direction protocol\n");
1441: retv += PPA_PROBE_EPP19;
1442: } else {
1443: /* The EPP timeout bit was not set, this could either be:
1444: * EPP 1.7
1445: * EPP 1.9 with software direction
1446: */
1447: outb(0x24, port + 2);
1448: inb(port + 4);
1449: a = inb(port + 1);
1450: outb(a, port + 1);
1451: outb(a & 0xfe, port + 1);
1452: if (a & 0x01) {
1453: printk(PPA_ID " EPP 1.9 with software direction protocol\n");
1454: retv += PPA_PROBE_EPP19;
1455: } else {
1456: printk(PPA_ID " EPP 1.7\n");
1457: retv += PPA_PROBE_EPP17;
1458: }
1459: }
1460:
1461: outb(0x0c, port + 0x402);
1462: outb(0x0c, port + 0x002);
1463: return retv;
1464: }
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