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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: unsigned short ppb;
263:
264: printk("ppa: Version %s\n", PPA_VERSION);
265: nhosts = 0;
266:
267: for (i = 0; i < parbus_no; i++) {
268: if (parbus_base[i] == 0x0000)
269: continue;
270: ppb = ppa_hosts[i].base = parbus_base[i];
271:
272: /* sanity checks */
273: if (check_region(parbus_base[i],
274: (parbus_base[i] == 0x03bc) ? 3 : 8))
275: continue;
276:
277: pc87332_port(i);
278: if (!generic_port(i))
279: continue;
280:
281: if (ppa_init(i))
282: continue;
283:
284: /* now the glue ... */
285: switch (ppa_hosts[i].mode) {
286: case PPA_NIBBLE:
287: case PPA_PS2:
288: ports = 3;
289: break;
290: case PPA_EPP_8:
291: case PPA_EPP_16:
292: case PPA_EPP_32:
293: ports = 8;
294: break;
295: default: /* Never gets here */
296: continue;
297: }
298: request_region(ppa_hosts[i].base, ports, "ppa");
299: host->can_queue = PPA_CAN_QUEUE;
300: host->sg_tablesize = ppa_sg;
301: hreg = scsi_register(host, 0);
302: hreg->io_port = ppa_hosts[i].base;
303: hreg->n_io_port = ports;
304: hreg->dma_channel = -1;
305: hreg->unique_id = i;
306: ppa_hosts[i].host = hreg->host_no;
307: nhosts++;
308: }
309: if (nhosts == 0)
310: return 0;
311: else
312: return 1; /* return number of hosts detected */
313: }
314:
315: /* This is to give the ppa driver a way to modify the timings (and other
316: * parameters) by writing to the /proc/scsi/ppa/0 file.
317: * Very simple method really... (To simple, no error checking :( )
318: * Reason: Kernel hackers HATE having to unload and reload modules for
319: * testing...
320: * Also gives a method to use a script to obtain optimum timings (TODO)
321: */
322:
323: static inline int ppa_strncmp(const char *a, const char *b, int len)
324: {
325: int loop;
326: for (loop = 0; loop < len; loop++)
327: if (a[loop] != b[loop])
328: return 1;
329:
330: return 0;
331: }
332: static inline int ppa_proc_write(int hostno, char *buffer, int length)
333: {
334: unsigned long x;
335:
336: if ((length > 5) && (ppa_strncmp(buffer, "mode=", 5) == 0)) {
337: x = simple_strtoul(buffer + 5, NULL, 0);
338: ppa_hosts[hostno].mode = x;
339: return length;
340: }
341: printk("ppa /proc: invalid variable\n");
342: return (-EINVAL);
343: }
344:
345: int ppa_proc_info(char *buffer, char **start, off_t offset,
346: int length, int hostno, int inout)
347: {
348: int i;
349: int len = 0;
350:
351: for (i = 0; i < 4; i++)
352: if (ppa_hosts[i].host == hostno)
353: break;
354:
355: if (inout)
356: return ppa_proc_write(i, buffer, length);
357:
358: len += sprintf(buffer + len, "Version : %s\n", PPA_VERSION);
359: len += sprintf(buffer + len, "Port : 0x%04x\n", ppa_hosts[i].base);
360: len += sprintf(buffer + len, "Mode : %s\n", PPA_MODE_STRING[ppa_hosts[i].mode]);
361:
362: /* Request for beyond end of buffer */
363: if (offset > len)
364: return 0;
365:
366: *start = buffer + offset;
367: len -= offset;
368: if (len > length)
369: len = length;
370: return len;
371: } /* end of ppa.c */
372: static int device_check(int host_no);
373:
374: #if PPA_DEBUG > 0
375: #define ppa_fail(x,y) printk("ppa: ppa_fail(%i) from %s at line %d\n",\
376: y, __FUNCTION__, __LINE__); ppa_fail_func(x,y);
377: static inline void ppa_fail_func(int host_no, int error_code)
378: #else
379: static inline void ppa_fail(int host_no, int error_code)
380: #endif
381: {
382: /* If we fail a device then we trash status / message bytes */
383: if (ppa_hosts[host_no].cur_cmd) {
384: ppa_hosts[host_no].cur_cmd->result = error_code << 16;
385: ppa_hosts[host_no].failed = 1;
386: }
387: }
388:
389: /*
390: * Wait for the high bit to be set.
391: *
392: * In principle, this could be tied to an interrupt, but the adapter
393: * doesn't appear to be designed to support interrupts. We spin on
394: * the 0x80 ready bit.
395: */
396: static unsigned char ppa_wait(int host_no)
397: {
398: int k;
399: unsigned short ppb = PPA_BASE(host_no);
400: unsigned char r;
401:
402: k = PPA_SPIN_TMO;
403: do {
404: r = r_str(ppb);
405: k--;
406: udelay(1);
407: }
408: while (!(r & 0x80) && (k));
409:
410: /*
411: * return some status information.
412: * Semantics: 0xc0 = ZIP wants more data
413: * 0xd0 = ZIP wants to send more data
414: * 0xe0 = ZIP is expecting SCSI command data
415: * 0xf0 = end of transfer, ZIP is sending status
416: */
417: if (k)
418: return (r & 0xf0);
419:
420: /* Counter expired - Time out occurred */
421: ppa_fail(host_no, DID_TIME_OUT);
422: printk("ppa timeout in ppa_wait\n");
423: return 0; /* command timed out */
424: }
425:
426: /*
427: * output a string, in whatever mode is available, according to the
428: * PPA protocol.
429: */
430: static inline void epp_reset(unsigned short ppb)
431: {
432: int i;
433:
434: i = r_str(ppb);
435: w_str(ppb, i);
436: w_str(ppb, i & 0xfe);
437: }
438:
439: static inline void ecp_sync(unsigned short ppb)
440: {
441: int i;
442:
443: if ((r_ecr(ppb) & 0xe0) != 0x80)
444: return;
445:
446: for (i = 0; i < 100; i++) {
447: if (r_ecr(ppb) & 0x01)
448: return;
449: udelay(5);
450: }
451: printk("ppa: ECP sync failed as data still present in FIFO.\n");
452: }
453:
454: /*
455: * Here is the asm code for the SPP/PS2 protocols for the i386.
456: * This has been optimised for speed on 386/486 machines. There will
457: * be very little improvement on the current 586+ machines as it is the
458: * IO statements which will limit throughput.
459: */
460: #ifdef __i386__
461: #define BYTE_OUT(reg) \
462: " movb " #reg ",%%al\n" \
463: " outb %%al,(%%dx)\n" \
464: " addl $2,%%edx\n" \
465: " movb $0x0e,%%al\n" \
466: " outb %%al,(%%dx)\n" \
467: " movb $0x0c,%%al\n" \
468: " outb %%al,(%%dx)\n" \
469: " subl $2,%%edx\n"
470:
471: static inline int ppa_byte_out(unsigned short base, char *buffer, unsigned int len)
472: {
1.1.1.2 ! root 473: int i;
! 474:
! 475: for (i = len; i; i--) {
! 476: w_dtr(base, *buffer++);
! 477: w_ctr(base, 0xe);
! 478: w_ctr(base, 0xc);
! 479: }
1.1 root 480: return 1; /* All went well - we hope! */
481: }
482:
483: #define BYTE_IN(reg) \
484: " inb (%%dx),%%al\n" \
485: " movb %%al," #reg "\n" \
486: " addl $2,%%edx\n" \
487: " movb $0x27,%%al\n" \
488: " outb %%al,(%%dx)\n" \
489: " movb $0x25,%%al\n" \
490: " outb %%al,(%%dx)\n" \
491: " subl $2,%%edx\n"
492:
493: static inline int ppa_byte_in(unsigned short base, char *buffer, int len)
494: {
1.1.1.2 ! root 495: int i;
! 496:
! 497: for (i = len; i; i--) {
! 498: *buffer++ = r_dtr(base);
! 499: w_ctr(base, 0x27);
! 500: w_ctr(base, 0x25);
! 501: }
1.1 root 502: return 1; /* All went well - we hope! */
503: }
504:
505: #define NIBBLE_IN(reg) \
506: " incl %%edx\n" \
507: " movb $0x04,%%al\n" \
508: " outb %%al,(%%dx)\n" \
509: " decl %%edx\n" \
510: " inb (%%dx),%%al\n" \
511: " andb $0xf0,%%al\n" \
512: " movb %%al," #reg "\n" \
513: " incl %%edx\n" \
514: " movb $0x06,%%al\n" \
515: " outb %%al,(%%dx)\n" \
516: " decl %%edx\n" \
517: " inb (%%dx),%%al\n" \
518: " shrb $4,%%al\n" \
519: " orb %%al," #reg "\n"
520:
521: static inline int ppa_nibble_in(unsigned short str_p, char *buffer, int len)
522: {
1.1.1.2 ! root 523: for (; len; len--) {
! 524: unsigned char h;
! 525:
! 526: w_ctr(base, 0x4);
! 527: h = r_str(base) & 0xf0;
! 528: w_ctr(base, 0x6);
! 529: *buffer++ = h | ((r_str(base) & 0xf0) >> 4);
! 530: }
1.1 root 531: return 1; /* All went well - we hope! */
532: }
533: #else /* Old style C routines */
534:
535: static inline int ppa_byte_out(unsigned short base, const char *buffer, int len)
536: {
537: unsigned short ctr_p = base + 2;
538: int i;
539:
540: for (i = len; i; i--) {
541: outb(*buffer++, base);
542: outb(0xe, ctr_p);
543: outb(0xc, ctr_p);
544: }
545: return 1; /* All went well - we hope! */
546: }
547:
548: static inline int ppa_byte_in(unsigned short base, char *buffer, int len)
549: {
550: unsigned short ctr_p = base + 2;
551: int i;
552:
553: for (i = len; i; i--) {
554: *buffer++ = inb(base);
555: outb(0x27, ctr_p);
556: outb(0x25, ctr_p);
557: }
558: return 1; /* All went well - we hope! */
559: }
560:
561: static inline int ppa_nibble_in(unsigned short str_p, char *buffer, int len)
562: {
563: unsigned short ctr_p = str_p + 1;
564: unsigned char h, l;
565: int i;
566:
567: for (i = len; i; i--) {
568: outb(0x4, ctr_p);
569: h = inb(str_p);
570: outb(0x6, ctr_p);
571: l = inb(str_p);
572: *buffer++ = (h & 0xf0) | ((l & 0xf0) >> 4);
573: }
574: return 1; /* All went well - we hope! */
575: }
576: #endif
577:
578: static inline int ppa_epp_out(unsigned short epp_p, unsigned short str_p, const char *buffer, int len)
579: {
580: int i;
581: for (i = len; i; i--) {
582: outb(*buffer++, epp_p);
583: #ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
584: if (inb(str_p) & 0x01)
585: return 0;
586: #endif
587: }
588: return 1;
589: }
590:
591: static int ppa_out(int host_no, char *buffer, int len)
592: {
593: int r;
594: unsigned short ppb = PPA_BASE(host_no);
595:
596: r = ppa_wait(host_no);
597:
598: if ((r & 0x50) != 0x40) {
599: ppa_fail(host_no, DID_ERROR);
600: return 0;
601: }
602: switch (ppa_hosts[host_no].mode) {
603: case PPA_NIBBLE:
604: case PPA_PS2:
605: /* 8 bit output, with a loop */
606: r = ppa_byte_out(ppb, buffer, len);
607: break;
608:
609: case PPA_EPP_32:
610: case PPA_EPP_16:
611: case PPA_EPP_8:
612: epp_reset(ppb);
613: w_ctr(ppb, 0x4);
614: #ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
615: r = ppa_epp_out(ppb + 4, ppb + 1, buffer, len);
616: #else
617: if (!(((long) buffer | len) & 0x03))
618: outsl(ppb + 4, buffer, len >> 2);
619: else
620: outsb(ppb + 4, buffer, len);
621: w_ctr(ppb, 0xc);
622: r = !(r_str(ppb) & 0x01);
623: #endif
624: w_ctr(ppb, 0xc);
625: ecp_sync(ppb);
626: break;
627:
628: default:
629: printk("PPA: bug in ppa_out()\n");
630: r = 0;
631: }
632: return r;
633: }
634:
635: static inline int ppa_epp_in(int epp_p, int str_p, char *buffer, int len)
636: {
637: int i;
638: for (i = len; i; i--) {
639: *buffer++ = inb(epp_p);
640: #ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
641: if (inb(str_p) & 0x01)
642: return 0;
643: #endif
644: }
645: return 1;
646: }
647:
648: static int ppa_in(int host_no, char *buffer, int len)
649: {
650: int r;
651: unsigned short ppb = PPA_BASE(host_no);
652:
653: r = ppa_wait(host_no);
654:
655: if ((r & 0x50) != 0x50) {
656: ppa_fail(host_no, DID_ERROR);
657: return 0;
658: }
659: switch (ppa_hosts[host_no].mode) {
660: case PPA_NIBBLE:
661: /* 4 bit input, with a loop */
662: r = ppa_nibble_in(ppb + 1, buffer, len);
663: w_ctr(ppb, 0xc);
664: break;
665:
666: case PPA_PS2:
667: /* 8 bit input, with a loop */
668: w_ctr(ppb, 0x25);
669: r = ppa_byte_in(ppb, buffer, len);
670: w_ctr(ppb, 0x4);
671: w_ctr(ppb, 0xc);
672: break;
673:
674: case PPA_EPP_32:
675: case PPA_EPP_16:
676: case PPA_EPP_8:
677: epp_reset(ppb);
678: w_ctr(ppb, 0x24);
679: #ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
680: r = ppa_epp_in(ppb + 4, ppb + 1, buffer, len);
681: #else
682: if (!(((long) buffer | len) & 0x03))
683: insl(ppb + 4, buffer, len >> 2);
684: else
685: insb(ppb + 4, buffer, len);
686: w_ctr(ppb, 0x2c);
687: r = !(r_str(ppb) & 0x01);
688: #endif
689: w_ctr(ppb, 0x2c);
690: ecp_sync(ppb);
691: break;
692:
693: default:
694: printk("PPA: bug in ppa_ins()\n");
695: r = 0;
696: break;
697: }
698: return r;
699: }
700:
701: /* end of ppa_io.h */
702: static inline void ppa_d_pulse(unsigned short ppb, unsigned char b)
703: {
704: w_dtr(ppb, b);
705: w_ctr(ppb, 0xc);
706: w_ctr(ppb, 0xe);
707: w_ctr(ppb, 0xc);
708: w_ctr(ppb, 0x4);
709: w_ctr(ppb, 0xc);
710: }
711:
712: static void ppa_disconnect(int host_no)
713: {
714: unsigned short ppb = PPA_BASE(host_no);
715:
716: ppa_d_pulse(ppb, 0);
717: ppa_d_pulse(ppb, 0x3c);
718: ppa_d_pulse(ppb, 0x20);
719: ppa_d_pulse(ppb, 0xf);
720: }
721:
722: static inline void ppa_c_pulse(unsigned short ppb, unsigned char b)
723: {
724: w_dtr(ppb, b);
725: w_ctr(ppb, 0x4);
726: w_ctr(ppb, 0x6);
727: w_ctr(ppb, 0x4);
728: w_ctr(ppb, 0xc);
729: }
730:
731: static inline void ppa_connect(int host_no, int flag)
732: {
733: unsigned short ppb = PPA_BASE(host_no);
734:
735: ppa_c_pulse(ppb, 0);
736: ppa_c_pulse(ppb, 0x3c);
737: ppa_c_pulse(ppb, 0x20);
738: if ((flag == CONNECT_EPP_MAYBE) &&
739: IN_EPP_MODE(ppa_hosts[host_no].mode))
740: ppa_c_pulse(ppb, 0xcf);
741: else
742: ppa_c_pulse(ppb, 0x8f);
743: }
744:
745: static int ppa_select(int host_no, int target)
746: {
747: int k;
748: unsigned short ppb = PPA_BASE(host_no);
749:
750: /*
751: * Bit 6 (0x40) is the device selected bit.
752: * First we must wait till the current device goes off line...
753: */
754: k = PPA_SELECT_TMO;
755: do {
756: k--;
757: } while ((r_str(ppb) & 0x40) && (k));
758: if (!k)
759: return 0;
760:
761: w_dtr(ppb, (1 << target));
762: w_ctr(ppb, 0xe);
763: w_ctr(ppb, 0xc);
764: w_dtr(ppb, 0x80); /* This is NOT the initator */
765: w_ctr(ppb, 0x8);
766:
767: k = PPA_SELECT_TMO;
768: do {
769: k--;
770: }
771: while (!(r_str(ppb) & 0x40) && (k));
772: if (!k)
773: return 0;
774:
775: return 1;
776: }
777:
778: /*
779: * This is based on a trace of what the Iomega DOS 'guest' driver does.
780: * I've tried several different kinds of parallel ports with guest and
781: * coded this to react in the same ways that it does.
782: *
783: * The return value from this function is just a hint about where the
784: * handshaking failed.
785: *
786: */
787: static int ppa_init(int host_no)
788: {
789: int retv;
790: unsigned short ppb = PPA_BASE(host_no);
791:
792: ppa_disconnect(host_no);
793: ppa_connect(host_no, CONNECT_NORMAL);
794:
795: retv = 2; /* Failed */
796:
797: w_ctr(ppb, 0xe);
798: if ((r_str(ppb) & 0x08) == 0x08)
799: retv--;
800:
801: w_ctr(ppb, 0xc);
802: if ((r_str(ppb) & 0x08) == 0x00)
803: retv--;
804:
805: /* This is a SCSI BUS reset signal */
806: if (!retv) {
807: w_dtr(ppb, 0x40);
808: w_ctr(ppb, 0x08);
809: udelay(30);
810: w_ctr(ppb, 0x0c);
811: udelay(1000); /* Allow devices to settle down */
812: }
813: ppa_disconnect(host_no);
814: udelay(1000); /* Another delay to allow devices to settle */
815:
816: if (!retv)
817: retv = device_check(host_no);
818:
819: return retv;
820: }
821:
822: static inline int ppa_send_command(Scsi_Cmnd * cmd)
823: {
824: int host_no = cmd->host->unique_id;
825: int k;
826:
827: w_ctr(PPA_BASE(host_no), 0x0c);
828:
829: for (k = 0; k < cmd->cmd_len; k++)
830: if (!ppa_out(host_no, &cmd->cmnd[k], 1))
831: return 0;
832: return 1;
833: }
834:
835: /*
836: * The bulk flag enables some optimisations in the data transfer loops,
837: * it should be true for any command that transfers data in integral
838: * numbers of sectors.
839: *
840: * The driver appears to remain stable if we speed up the parallel port
841: * i/o in this function, but not elsewhere.
842: */
843: static int ppa_completion(Scsi_Cmnd * cmd)
844: {
845: /* Return codes:
846: * -1 Error
847: * 0 Told to schedule
848: * 1 Finished data transfer
849: */
850: int host_no = cmd->host->unique_id;
851: unsigned short ppb = PPA_BASE(host_no);
852: unsigned long start_jiffies = jiffies;
853:
854: unsigned char r, v;
855: int fast, bulk, status;
856:
857: v = cmd->cmnd[0];
858: bulk = ((v == READ_6) ||
859: (v == READ_10) ||
860: (v == WRITE_6) ||
861: (v == WRITE_10));
862:
863: /*
864: * We only get here if the drive is ready to comunicate,
865: * hence no need for a full ppa_wait.
866: */
867: r = (r_str(ppb) & 0xf0);
868:
869: while (r != (unsigned char) 0xf0) {
870: /*
871: * If we have been running for more than a full timer tick
872: * then take a rest.
873: */
874: if (jiffies > start_jiffies + 1)
875: return 0;
876:
877: if (((r & 0xc0) != 0xc0) || (cmd->SCp.this_residual <= 0)) {
878: ppa_fail(host_no, DID_ERROR);
879: return -1; /* ERROR_RETURN */
880: }
881: /* determine if we should use burst I/O */ fast = (bulk && (cmd->SCp.this_residual >= PPA_BURST_SIZE))
882: ? PPA_BURST_SIZE : 1;
883:
884: if (r == (unsigned char) 0xc0)
885: status = ppa_out(host_no, cmd->SCp.ptr, fast);
886: else
887: status = ppa_in(host_no, cmd->SCp.ptr, fast);
888:
889: cmd->SCp.ptr += fast;
890: cmd->SCp.this_residual -= fast;
891:
892: if (!status) {
893: ppa_fail(host_no, DID_BUS_BUSY);
894: return -1; /* ERROR_RETURN */
895: }
896: if (cmd->SCp.buffer && !cmd->SCp.this_residual) {
897: /* if scatter/gather, advance to the next segment */
898: if (cmd->SCp.buffers_residual--) {
899: cmd->SCp.buffer++;
900: cmd->SCp.this_residual = cmd->SCp.buffer->length;
901: cmd->SCp.ptr = cmd->SCp.buffer->address;
902: }
903: }
904: /* Now check to see if the drive is ready to comunicate */
905: r = (r_str(ppb) & 0xf0);
906: /* If not, drop back down to the scheduler and wait a timer tick */
907: if (!(r & 0x80))
908: return 0;
909: }
910: return 1; /* FINISH_RETURN */
911: }
912:
913: /*
914: * Since the PPA itself doesn't generate interrupts, we use
915: * the scheduler's task queue to generate a stream of call-backs and
916: * complete the request when the drive is ready.
917: */
918: static void ppa_interrupt(void *data)
919: {
920: ppa_struct *tmp = (ppa_struct *) data;
921: Scsi_Cmnd *cmd = tmp->cur_cmd;
922:
923: if (!cmd) {
924: printk("PPA: bug in ppa_interrupt\n");
925: return;
926: }
927: if (ppa_engine(tmp, cmd)) {
928: tmp->ppa_tq.data = (void *) tmp;
929: tmp->ppa_tq.sync = 0;
930: queue_task(&tmp->ppa_tq, &tq_timer);
931: return;
932: }
933: /* Command must of completed hence it is safe to let go... */
934: #if PPA_DEBUG > 0
935: switch ((cmd->result >> 16) & 0xff) {
936: case DID_OK:
937: break;
938: case DID_NO_CONNECT:
939: printk("ppa: no device at SCSI ID %i\n", cmd->target);
940: break;
941: case DID_BUS_BUSY:
942: printk("ppa: BUS BUSY - EPP timeout detected\n");
943: break;
944: case DID_TIME_OUT:
945: printk("ppa: unknown timeout\n");
946: break;
947: case DID_ABORT:
948: printk("ppa: told to abort\n");
949: break;
950: case DID_PARITY:
951: printk("ppa: parity error (???)\n");
952: break;
953: case DID_ERROR:
954: printk("ppa: internal driver error\n");
955: break;
956: case DID_RESET:
957: printk("ppa: told to reset device\n");
958: break;
959: case DID_BAD_INTR:
960: printk("ppa: bad interrupt (???)\n");
961: break;
962: default:
963: printk("ppa: bad return code (%02x)\n", (cmd->result >> 16) & 0xff);
964: }
965: #endif
966:
967: if (cmd->SCp.phase > 1)
968: ppa_disconnect(cmd->host->unique_id);
969:
970: tmp->cur_cmd = 0;
971: cmd->scsi_done(cmd);
972: return;
973: }
974:
975: static int ppa_engine(ppa_struct * tmp, Scsi_Cmnd * cmd)
976: {
977: int host_no = cmd->host->unique_id;
978: unsigned short ppb = PPA_BASE(host_no);
979: unsigned char l = 0, h = 0;
980: int retv;
981:
982: /* First check for any errors that may have occurred
983: * Here we check for internal errors
984: */
985: if (tmp->failed)
986: return 0;
987:
988: switch (cmd->SCp.phase) {
989: case 0: /* Phase 0 - Waiting for parport */
990: if ((jiffies - tmp->jstart) > HZ) {
991: /*
992: * We waited more than a second
993: * for parport to call us
994: */
995: ppa_fail(host_no, DID_BUS_BUSY);
996: return 0;
997: }
998: return 1; /* wait until ppa_wakeup claims parport */
999: case 1: /* Phase 1 - Connected */
1000: { /* Perform a sanity check for cable unplugged */
1001: int retv = 2; /* Failed */
1002:
1003: ppa_connect(host_no, CONNECT_EPP_MAYBE);
1004:
1005: w_ctr(ppb, 0xe);
1006: if ((r_str(ppb) & 0x08) == 0x08)
1007: retv--;
1008:
1009: w_ctr(ppb, 0xc);
1010: if ((r_str(ppb) & 0x08) == 0x00)
1011: retv--;
1012:
1013: if (retv)
1014: if ((jiffies - tmp->jstart) > (1 * HZ)) {
1015: printk("ppa: Parallel port cable is unplugged!!\n");
1016: ppa_fail(host_no, DID_BUS_BUSY);
1017: return 0;
1018: } else {
1019: ppa_disconnect(host_no);
1020: return 1; /* Try again in a jiffy */
1021: }
1022: cmd->SCp.phase++;
1023: }
1024:
1025: case 2: /* Phase 2 - We are now talking to the scsi bus */
1026: if (!ppa_select(host_no, cmd->target)) {
1027: ppa_fail(host_no, DID_NO_CONNECT);
1028: return 0;
1029: }
1030: cmd->SCp.phase++;
1031:
1032: case 3: /* Phase 3 - Ready to accept a command */
1033: w_ctr(ppb, 0x0c);
1034: if (!(r_str(ppb) & 0x80))
1035: return 1;
1036:
1037: if (!ppa_send_command(cmd))
1038: return 0;
1039: cmd->SCp.phase++;
1040:
1041: case 4: /* Phase 4 - Setup scatter/gather buffers */
1042: if (cmd->use_sg) {
1043: /* if many buffers are available, start filling the first */
1044: cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer;
1045: cmd->SCp.this_residual = cmd->SCp.buffer->length;
1046: cmd->SCp.ptr = cmd->SCp.buffer->address;
1047: } else {
1048: /* else fill the only available buffer */
1049: cmd->SCp.buffer = NULL;
1050: cmd->SCp.this_residual = cmd->request_bufflen;
1051: cmd->SCp.ptr = cmd->request_buffer;
1052: }
1053: cmd->SCp.buffers_residual = cmd->use_sg;
1054: cmd->SCp.phase++;
1055:
1056: case 5: /* Phase 5 - Data transfer stage */
1057: w_ctr(ppb, 0x0c);
1058: if (!(r_str(ppb) & 0x80))
1059: return 1;
1060:
1061: retv = ppa_completion(cmd);
1062: if (retv == -1)
1063: return 0;
1064: if (retv == 0)
1065: return 1;
1066: cmd->SCp.phase++;
1067:
1068: case 6: /* Phase 6 - Read status/message */
1069: cmd->result = DID_OK << 16;
1070: /* Check for data overrun */
1071: if (ppa_wait(host_no) != (unsigned char) 0xf0) {
1072: ppa_fail(host_no, DID_ERROR);
1073: return 0;
1074: }
1075: if (ppa_in(host_no, &l, 1)) { /* read status byte */
1076: /* Check for optional message byte */
1077: if (ppa_wait(host_no) == (unsigned char) 0xf0)
1078: ppa_in(host_no, &h, 1);
1079: cmd->result = (DID_OK << 16) + (h << 8) + (l & STATUS_MASK);
1080: }
1081: return 0; /* Finished */
1082: break;
1083:
1084: default:
1085: printk("ppa: Invalid scsi phase\n");
1086: }
1087: return 0;
1088: }
1089:
1090: int ppa_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
1091: {
1092: int host_no = cmd->host->unique_id;
1093:
1094: if (ppa_hosts[host_no].cur_cmd) {
1095: printk("PPA: bug in ppa_queuecommand\n");
1096: return 0;
1097: }
1098: ppa_hosts[host_no].failed = 0;
1099: ppa_hosts[host_no].jstart = jiffies;
1100: ppa_hosts[host_no].cur_cmd = cmd;
1101: cmd->scsi_done = done;
1102: cmd->result = DID_ERROR << 16; /* default return code */
1103: cmd->SCp.phase = 0; /* bus free */
1104:
1105: ppa_pb_claim(host_no);
1106:
1107: ppa_hosts[host_no].ppa_tq.data = ppa_hosts + host_no;
1108: ppa_hosts[host_no].ppa_tq.sync = 0;
1109: queue_task(&ppa_hosts[host_no].ppa_tq, &tq_immediate);
1110: mark_bh(IMMEDIATE_BH);
1111:
1112: return 0;
1113: }
1114:
1115: /*
1116: * Apparently the disk->capacity attribute is off by 1 sector
1117: * for all disk drives. We add the one here, but it should really
1118: * be done in sd.c. Even if it gets fixed there, this will still
1119: * work.
1120: */
1121: int ppa_biosparam(Disk * disk, kdev_t dev, int ip[])
1122: {
1123: ip[0] = 0x40;
1124: ip[1] = 0x20;
1125: ip[2] = (disk->capacity + 1) / (ip[0] * ip[1]);
1126: if (ip[2] > 1024) {
1127: ip[0] = 0xff;
1128: ip[1] = 0x3f;
1129: ip[2] = (disk->capacity + 1) / (ip[0] * ip[1]);
1130: if (ip[2] > 1023)
1131: ip[2] = 1023;
1132: }
1133: return 0;
1134: }
1135:
1136: int ppa_abort(Scsi_Cmnd * cmd)
1137: {
1138: /*
1139: * There is no method for aborting commands since Iomega
1140: * have tied the SCSI_MESSAGE line high in the interface
1141: */
1142:
1143: switch (cmd->SCp.phase) {
1144: case 0: /* Do not have access to parport */
1145: case 1: /* Have not connected to interface */
1146: cmd->result = DID_ABORT;
1147: cmd->done(cmd);
1148: return SCSI_ABORT_SUCCESS;
1149: break;
1150: default: /* SCSI command sent, can not abort */
1151: return SCSI_ABORT_BUSY;
1152: break;
1153: }
1154: }
1155:
1156: int ppa_reset(Scsi_Cmnd * cmd, unsigned int x)
1157: {
1158: int host_no = cmd->host->unique_id;
1159: int ppb = PPA_BASE(host_no);
1160:
1161: /*
1162: * PHASE1:
1163: * Bring the interface crashing down on whatever is running
1164: * hopefully this will kill the request.
1165: * Bring back up the interface, reset the drive (and anything
1166: * attached for that manner)
1167: */
1168: if (cmd)
1169: if (cmd->SCp.phase)
1170: ppa_disconnect(cmd->host->unique_id);
1171:
1172: ppa_connect(host_no, CONNECT_NORMAL);
1173: w_dtr(ppb, 0x40);
1174: w_ctr(ppb, 0x8);
1175: udelay(30);
1176: w_ctr(ppb, 0xc);
1177: udelay(1000); /* delay for devices to settle down */
1178: ppa_disconnect(host_no);
1179: udelay(1000); /* Additional delay to allow devices to settle down */
1180:
1181: /*
1182: * PHASE2:
1183: * Sanity check for the sake of mid-level driver
1184: */
1185: if (!cmd) {
1186: printk("ppa bus reset called for invalid command.\n");
1187: return SCSI_RESET_NOT_RUNNING;
1188: }
1189: /*
1190: * PHASE3:
1191: * Flag the current command as having died due to reset
1192: */
1193: ppa_connect(host_no, CONNECT_NORMAL);
1194: ppa_fail(host_no, DID_RESET);
1195:
1196: /* Since the command was already on the timer queue ppa_interrupt
1197: * will be called shortly.
1198: */
1199: return SCSI_RESET_PENDING;
1200: }
1201:
1202: static int device_check(int host_no)
1203: {
1204: /* This routine looks for a device and then attempts to use EPP
1205: to send a command. If all goes as planned then EPP is available. */
1206:
1207: static char cmd[6] =
1208: {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
1209: int loop, old_mode, status, k, ppb = PPA_BASE(host_no);
1210: unsigned char l;
1211:
1212: old_mode = ppa_hosts[host_no].mode;
1213: for (loop = 0; loop < 8; loop++) {
1214: /* Attempt to use EPP for Test Unit Ready */
1215: if ((ppb & 0x0007) == 0x0000)
1216: ppa_hosts[host_no].mode = PPA_EPP_32;
1217:
1218: second_pass:
1219: ppa_connect(host_no, CONNECT_EPP_MAYBE);
1220: /* Select SCSI device */
1221: if (!ppa_select(host_no, loop)) {
1222: ppa_disconnect(host_no);
1223: continue;
1224: }
1225: printk("ppa: Found device at ID %i, Attempting to use %s\n", loop,
1226: PPA_MODE_STRING[ppa_hosts[host_no].mode]);
1227:
1228: /* Send SCSI command */
1229: status = 1;
1230: w_ctr(ppb, 0x0c);
1231: for (l = 0; (l < 6) && (status); l++)
1232: status = ppa_out(host_no, cmd, 1);
1233:
1234: if (!status) {
1235: ppa_disconnect(host_no);
1236: ppa_connect(host_no, CONNECT_EPP_MAYBE);
1237: w_dtr(ppb, 0x40);
1238: w_ctr(ppb, 0x08);
1239: udelay(30);
1240: w_ctr(ppb, 0x0c);
1241: udelay(1000);
1242: ppa_disconnect(host_no);
1243: udelay(1000);
1244: if (ppa_hosts[host_no].mode == PPA_EPP_32) {
1245: ppa_hosts[host_no].mode = old_mode;
1246: goto second_pass;
1247: }
1248: printk("ppa: Unable to establish communication, aborting driver load.\n");
1249: return 1;
1250: }
1251: w_ctr(ppb, 0x0c);
1252: k = 1000000; /* 1 Second */
1253: do {
1254: l = r_str(ppb);
1255: k--;
1256: udelay(1);
1257: } while (!(l & 0x80) && (k));
1258:
1259: l &= 0xf0;
1260:
1261: if (l != 0xf0) {
1262: ppa_disconnect(host_no);
1263: ppa_connect(host_no, CONNECT_EPP_MAYBE);
1264: w_dtr(ppb, 0x40);
1265: w_ctr(ppb, 0x08);
1266: udelay(30);
1267: w_ctr(ppb, 0x0c);
1268: udelay(1000);
1269: ppa_disconnect(host_no);
1270: udelay(1000);
1271: if (ppa_hosts[host_no].mode == PPA_EPP_32) {
1272: ppa_hosts[host_no].mode = old_mode;
1273: goto second_pass;
1274: }
1275: printk("ppa: Unable to establish communication, aborting driver load.\n");
1276: return 1;
1277: }
1278: ppa_disconnect(host_no);
1279: printk("ppa: Communication established with ID %i using %s\n", loop,
1280: PPA_MODE_STRING[ppa_hosts[host_no].mode]);
1281: return 0;
1282: }
1283: printk("ppa: No devices found, aborting driver load.\n");
1284: return 1;
1285: }
1286:
1287: #define PPA_ID "ppa: "
1288:
1289: int port_probe(unsigned short port)
1290: {
1291: int retv = 0;
1292: unsigned char a, b, c;
1293: unsigned int i, j;
1294:
1295:
1296: printk(PPA_ID "Probing port %04x\n", port);
1297:
1298: /* ##### ###### ######
1299: * # # # # # #
1300: * # # # # #
1301: * ##### ###### ######
1302: * # # #
1303: * # # # #
1304: * ##### # #
1305: */
1306:
1307: outb(0x0c, port + 0x402);
1308: outb(0x0c, port + 0x002);
1309: outb(0x55, port);
1310: a = inb(port);
1311: if (a != 0x55)
1312: return retv;
1313: printk(PPA_ID " SPP port present\n");
1314:
1315: retv += PPA_PROBE_SPP;
1316:
1317: /* ####### ##### ######
1318: * # # # # #
1319: * # # # #
1320: * ##### # ######
1321: * # # #
1322: * # # # #
1323: * ####### ##### #
1324: */
1325:
1326: for (i = 1024; i > 0; i--) { /* clear at most 1k of data from FIFO */
1327: a = inb(port + 0x402);
1328: if ((a & 0x03) == 0x03)
1329: goto no_ecp;
1330: if (a & 0x01)
1331: break;
1332: inb(port + 0x400); /* Remove byte from FIFO */
1333: }
1334:
1335: if (i <= 0)
1336: goto no_ecp;
1337:
1338: b = a ^ 3;
1339: outb(b, port + 0x402);
1340: c = inb(port + 0x402);
1341:
1342: if (a == c) {
1343: outb(0xc0, port + 0x402); /* FIFO test */
1344: j = 0;
1345: while (!(inb(port + 0x402) & 0x01) && (j < 1024)) {
1346: inb(port + 0x400);
1347: j++;
1348: }
1349: if (j >= 1024)
1350: goto no_ecp;
1351: i = 0;
1352: j = 0;
1353: while (!(inb(port + 0x402) & 0x02) && (j < 1024)) {
1354: outb(0x00, port + 0x400);
1355: i++;
1356: j++;
1357: }
1358: if (j >= 1024)
1359: goto no_ecp;
1360: j = 0;
1361: while (!(inb(port + 0x402) & 0x01) && (j < 1024)) {
1362: inb(port + 0x400);
1363: j++;
1364: }
1365: if (j >= 1024)
1366: goto no_ecp;
1367: printk(PPA_ID " ECP with a %i byte FIFO present\n", i);
1368:
1369: retv += PPA_PROBE_ECR;
1370: }
1371: /* ###### ##### #####
1372: * # # # # # #
1373: * # # # #
1374: * ###### ##### #####
1375: * # # #
1376: * # # # #
1377: * # ##### #######
1378: */
1379:
1380: no_ecp:
1381: if (retv & PPA_PROBE_ECR)
1382: outb(0x20, port + 0x402);
1383:
1384: outb(0x55, port);
1385: outb(0x0c, port + 2);
1386: a = inb(port);
1387: outb(0x55, port);
1388: outb(0x2c, port + 2);
1389: b = inb(port);
1390: if (a != b) {
1391: printk(PPA_ID " PS/2 bidirectional port present\n");
1392: retv += PPA_PROBE_PS2;
1393: }
1394: /* ####### ###### ######
1395: * # # # # #
1396: * # # # # #
1397: * ##### ###### ######
1398: * # # #
1399: * # # #
1400: * ####### # #
1401: */
1402:
1403: if (port & 0x007) {
1404: printk(PPA_ID " EPP not supported at this address\n");
1405: return retv;
1406: }
1407: if (retv & PPA_PROBE_ECR) {
1408: for (i = 0x00; i < 0x80; i += 0x20) {
1409: outb(i, port + 0x402);
1410:
1411: a = inb(port + 1);
1412: outb(a, port + 1);
1413: outb(a & 0xfe, port + 1);
1414: a = inb(port + 1);
1415: if (!(a & 0x01)) {
1416: printk(PPA_ID " Failed Intel bug check. (Phony EPP in ECP)\n");
1417: return retv;
1418: }
1419: }
1420: printk(PPA_ID " Passed Intel bug check.\n");
1421: outb(0x80, port + 0x402);
1422: }
1423: a = inb(port + 1);
1424: outb(a, port + 1);
1425: outb(a & 0xfe, port + 1);
1426: a = inb(port + 1);
1427:
1428: if (a & 0x01) {
1429: outb(0x0c, port + 0x402);
1430: outb(0x0c, port + 0x002);
1431: return retv;
1432: }
1433:
1434: outb(0x04, port + 2);
1435: inb(port + 4);
1436: a = inb(port + 1);
1437: outb(a, port + 1);
1438: outb(a & 0xfe, port + 1);
1439:
1440: if (a & 0x01) {
1441: printk(PPA_ID " EPP 1.9 with hardware direction protocol\n");
1442: retv += PPA_PROBE_EPP19;
1443: } else {
1444: /* The EPP timeout bit was not set, this could either be:
1445: * EPP 1.7
1446: * EPP 1.9 with software direction
1447: */
1448: outb(0x24, port + 2);
1449: inb(port + 4);
1450: a = inb(port + 1);
1451: outb(a, port + 1);
1452: outb(a & 0xfe, port + 1);
1453: if (a & 0x01) {
1454: printk(PPA_ID " EPP 1.9 with software direction protocol\n");
1455: retv += PPA_PROBE_EPP19;
1456: } else {
1457: printk(PPA_ID " EPP 1.7\n");
1458: retv += PPA_PROBE_EPP17;
1459: }
1460: }
1461:
1462: outb(0x0c, port + 0x402);
1463: outb(0x0c, port + 0x002);
1464: return retv;
1465: }
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