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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: {
473: /*
474: * %eax scratch
475: * %ebx Data to transfer
476: * %ecx Counter (Don't touch!!)
477: * %edx Port
478: * %esi Source buffer (mem pointer)
479: *
480: * In case you are wondering what the last line of the asm does...
481: * <output allocation> : <input allocation> : <trashed registers>
482: */
483: asm("shr $2,%%ecx\n" \
484: " jz .no_more_bulk_bo\n" \
485: " .align 4\n" \
486: ".loop_bulk_bo:\n" \
487: " movl (%%esi),%%ebx\n" \
488: BYTE_OUT(%%bl) \
489: BYTE_OUT(%%bh) \
490: " rorl $16,%%ebx\n" \
491: BYTE_OUT(%%bl) \
492: BYTE_OUT(%%bh) \
493: " addl $4,%%esi\n" \
494: " loop .loop_bulk_bo\n" \
495: " .align 4\n" \
496: ".no_more_bulk_bo:" \
497: : "=S"(buffer): "c"(len), "d"(base), "S"(buffer):"eax", "ebx", "ecx");
498:
499: asm("andl $3,%%ecx\n" \
500: " jz .no_more_loose_bo\n" \
501: " .align 4\n" \
502: ".loop_loose_bo:\n" \
503: BYTE_OUT((%%esi)) \
504: " incl %%esi\n" \
505: " loop .loop_loose_bo\n" \
506: ".no_more_loose_bo:\n" \
507: : /* no output */ : "c"(len), "d"(base), "S"(buffer):"eax", "ebx", "ecx");
508: return 1; /* All went well - we hope! */
509: }
510:
511: #define BYTE_IN(reg) \
512: " inb (%%dx),%%al\n" \
513: " movb %%al," #reg "\n" \
514: " addl $2,%%edx\n" \
515: " movb $0x27,%%al\n" \
516: " outb %%al,(%%dx)\n" \
517: " movb $0x25,%%al\n" \
518: " outb %%al,(%%dx)\n" \
519: " subl $2,%%edx\n"
520:
521: static inline int ppa_byte_in(unsigned short base, char *buffer, int len)
522: {
523: /*
524: * %eax scratch
525: * %ebx Data to transfer
526: * %ecx Counter (Don't touch!!)
527: * %edx Port
528: * %esi Source buffer (mem pointer)
529: *
530: * In case you are wondering what the last line of the asm does...
531: * <output allocation> : <input allocation> : <trashed registers>
532: */
533: asm("shr $2,%%ecx\n" \
534: " jz .no_more_bulk_bi\n" \
535: " .align 4\n" \
536: ".loop_bulk_bi:\n" \
537: BYTE_IN(%%bl) \
538: BYTE_IN(%%bh) \
539: " rorl $16,%%ebx\n" \
540: BYTE_IN(%%bl) \
541: BYTE_IN(%%bh) \
542: " rorl $16,%%ebx\n" \
543: " movl %%ebx,(%%esi)\n" \
544: " addl $4,%%esi\n" \
545: " loop .loop_bulk_bi\n" \
546: " .align 4\n" \
547: ".no_more_bulk_bi:" \
548: : "=S"(buffer): "c"(len), "d"(base), "S"(buffer):"eax", "ebx", "ecx");
549:
550: asm("andl $3,%%ecx\n" \
551: " jz .no_more_loose_bi\n" \
552: " .align 4\n" \
553: ".loop_loose_bi:\n" \
554: BYTE_IN((%%esi)) \
555: " incl %%esi\n" \
556: " loop .loop_loose_bi\n" \
557: ".no_more_loose_bi:\n" \
558: : /* no output */ : "c"(len), "d"(base), "S"(buffer):"eax", "ebx", "ecx");
559: return 1; /* All went well - we hope! */
560: }
561:
562: #define NIBBLE_IN(reg) \
563: " incl %%edx\n" \
564: " movb $0x04,%%al\n" \
565: " outb %%al,(%%dx)\n" \
566: " decl %%edx\n" \
567: " inb (%%dx),%%al\n" \
568: " andb $0xf0,%%al\n" \
569: " movb %%al," #reg "\n" \
570: " incl %%edx\n" \
571: " movb $0x06,%%al\n" \
572: " outb %%al,(%%dx)\n" \
573: " decl %%edx\n" \
574: " inb (%%dx),%%al\n" \
575: " shrb $4,%%al\n" \
576: " orb %%al," #reg "\n"
577:
578: static inline int ppa_nibble_in(unsigned short str_p, char *buffer, int len)
579: {
580: /*
581: * %eax scratch
582: * %ebx Data to transfer
583: * %ecx Counter (Don't touch!!)
584: * %edx Port
585: * %esi Source buffer (mem pointer)
586: *
587: * In case you are wondering what the last line of the asm does...
588: * <output allocation> : <input allocation> : <trashed registers>
589: */
590: asm("shr $2,%%ecx\n" \
591: " jz .no_more_bulk_ni\n" \
592: " .align 4\n" \
593: ".loop_bulk_ni:\n" \
594: NIBBLE_IN(%%bl) \
595: NIBBLE_IN(%%bh) \
596: " rorl $16,%%ebx\n" \
597: NIBBLE_IN(%%bl) \
598: NIBBLE_IN(%%bh) \
599: " rorl $16,%%ebx\n" \
600: " movl %%ebx,(%%esi)\n" \
601: " addl $4,%%esi\n" \
602: " loop .loop_bulk_ni\n" \
603: " .align 4\n" \
604: ".no_more_bulk_ni:" \
605: : "=S"(buffer): "c"(len), "d"(str_p), "S"(buffer):"eax", "ebx", "ecx");
606:
607: asm("andl $3,%%ecx\n" \
608: " jz .no_more_loose_ni\n" \
609: " .align 4\n" \
610: ".loop_loose_ni:\n" \
611: NIBBLE_IN((%%esi)) \
612: " incl %%esi\n" \
613: " loop .loop_loose_ni\n" \
614: ".no_more_loose_ni:\n" \
615: : /* no output */ : "c"(len), "d"(str_p), "S"(buffer):"eax", "ebx", "ecx");
616: return 1; /* All went well - we hope! */
617: }
618: #else /* Old style C routines */
619:
620: static inline int ppa_byte_out(unsigned short base, const char *buffer, int len)
621: {
622: unsigned short ctr_p = base + 2;
623: int i;
624:
625: for (i = len; i; i--) {
626: outb(*buffer++, base);
627: outb(0xe, ctr_p);
628: outb(0xc, ctr_p);
629: }
630: return 1; /* All went well - we hope! */
631: }
632:
633: static inline int ppa_byte_in(unsigned short base, char *buffer, int len)
634: {
635: unsigned short ctr_p = base + 2;
636: int i;
637:
638: for (i = len; i; i--) {
639: *buffer++ = inb(base);
640: outb(0x27, ctr_p);
641: outb(0x25, ctr_p);
642: }
643: return 1; /* All went well - we hope! */
644: }
645:
646: static inline int ppa_nibble_in(unsigned short str_p, char *buffer, int len)
647: {
648: unsigned short ctr_p = str_p + 1;
649: unsigned char h, l;
650: int i;
651:
652: for (i = len; i; i--) {
653: outb(0x4, ctr_p);
654: h = inb(str_p);
655: outb(0x6, ctr_p);
656: l = inb(str_p);
657: *buffer++ = (h & 0xf0) | ((l & 0xf0) >> 4);
658: }
659: return 1; /* All went well - we hope! */
660: }
661: #endif
662:
663: static inline int ppa_epp_out(unsigned short epp_p, unsigned short str_p, const char *buffer, int len)
664: {
665: int i;
666: for (i = len; i; i--) {
667: outb(*buffer++, epp_p);
668: #ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
669: if (inb(str_p) & 0x01)
670: return 0;
671: #endif
672: }
673: return 1;
674: }
675:
676: static int ppa_out(int host_no, char *buffer, int len)
677: {
678: int r;
679: unsigned short ppb = PPA_BASE(host_no);
680:
681: r = ppa_wait(host_no);
682:
683: if ((r & 0x50) != 0x40) {
684: ppa_fail(host_no, DID_ERROR);
685: return 0;
686: }
687: switch (ppa_hosts[host_no].mode) {
688: case PPA_NIBBLE:
689: case PPA_PS2:
690: /* 8 bit output, with a loop */
691: r = ppa_byte_out(ppb, buffer, len);
692: break;
693:
694: case PPA_EPP_32:
695: case PPA_EPP_16:
696: case PPA_EPP_8:
697: epp_reset(ppb);
698: w_ctr(ppb, 0x4);
699: #ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
700: r = ppa_epp_out(ppb + 4, ppb + 1, buffer, len);
701: #else
702: if (!(((long) buffer | len) & 0x03))
703: outsl(ppb + 4, buffer, len >> 2);
704: else
705: outsb(ppb + 4, buffer, len);
706: w_ctr(ppb, 0xc);
707: r = !(r_str(ppb) & 0x01);
708: #endif
709: w_ctr(ppb, 0xc);
710: ecp_sync(ppb);
711: break;
712:
713: default:
714: printk("PPA: bug in ppa_out()\n");
715: r = 0;
716: }
717: return r;
718: }
719:
720: static inline int ppa_epp_in(int epp_p, int str_p, char *buffer, int len)
721: {
722: int i;
723: for (i = len; i; i--) {
724: *buffer++ = inb(epp_p);
725: #ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
726: if (inb(str_p) & 0x01)
727: return 0;
728: #endif
729: }
730: return 1;
731: }
732:
733: static int ppa_in(int host_no, char *buffer, int len)
734: {
735: int r;
736: unsigned short ppb = PPA_BASE(host_no);
737:
738: r = ppa_wait(host_no);
739:
740: if ((r & 0x50) != 0x50) {
741: ppa_fail(host_no, DID_ERROR);
742: return 0;
743: }
744: switch (ppa_hosts[host_no].mode) {
745: case PPA_NIBBLE:
746: /* 4 bit input, with a loop */
747: r = ppa_nibble_in(ppb + 1, buffer, len);
748: w_ctr(ppb, 0xc);
749: break;
750:
751: case PPA_PS2:
752: /* 8 bit input, with a loop */
753: w_ctr(ppb, 0x25);
754: r = ppa_byte_in(ppb, buffer, len);
755: w_ctr(ppb, 0x4);
756: w_ctr(ppb, 0xc);
757: break;
758:
759: case PPA_EPP_32:
760: case PPA_EPP_16:
761: case PPA_EPP_8:
762: epp_reset(ppb);
763: w_ctr(ppb, 0x24);
764: #ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
765: r = ppa_epp_in(ppb + 4, ppb + 1, buffer, len);
766: #else
767: if (!(((long) buffer | len) & 0x03))
768: insl(ppb + 4, buffer, len >> 2);
769: else
770: insb(ppb + 4, buffer, len);
771: w_ctr(ppb, 0x2c);
772: r = !(r_str(ppb) & 0x01);
773: #endif
774: w_ctr(ppb, 0x2c);
775: ecp_sync(ppb);
776: break;
777:
778: default:
779: printk("PPA: bug in ppa_ins()\n");
780: r = 0;
781: break;
782: }
783: return r;
784: }
785:
786: /* end of ppa_io.h */
787: static inline void ppa_d_pulse(unsigned short ppb, unsigned char b)
788: {
789: w_dtr(ppb, b);
790: w_ctr(ppb, 0xc);
791: w_ctr(ppb, 0xe);
792: w_ctr(ppb, 0xc);
793: w_ctr(ppb, 0x4);
794: w_ctr(ppb, 0xc);
795: }
796:
797: static void ppa_disconnect(int host_no)
798: {
799: unsigned short ppb = PPA_BASE(host_no);
800:
801: ppa_d_pulse(ppb, 0);
802: ppa_d_pulse(ppb, 0x3c);
803: ppa_d_pulse(ppb, 0x20);
804: ppa_d_pulse(ppb, 0xf);
805: }
806:
807: static inline void ppa_c_pulse(unsigned short ppb, unsigned char b)
808: {
809: w_dtr(ppb, b);
810: w_ctr(ppb, 0x4);
811: w_ctr(ppb, 0x6);
812: w_ctr(ppb, 0x4);
813: w_ctr(ppb, 0xc);
814: }
815:
816: static inline void ppa_connect(int host_no, int flag)
817: {
818: unsigned short ppb = PPA_BASE(host_no);
819:
820: ppa_c_pulse(ppb, 0);
821: ppa_c_pulse(ppb, 0x3c);
822: ppa_c_pulse(ppb, 0x20);
823: if ((flag == CONNECT_EPP_MAYBE) &&
824: IN_EPP_MODE(ppa_hosts[host_no].mode))
825: ppa_c_pulse(ppb, 0xcf);
826: else
827: ppa_c_pulse(ppb, 0x8f);
828: }
829:
830: static int ppa_select(int host_no, int target)
831: {
832: int k;
833: unsigned short ppb = PPA_BASE(host_no);
834:
835: /*
836: * Bit 6 (0x40) is the device selected bit.
837: * First we must wait till the current device goes off line...
838: */
839: k = PPA_SELECT_TMO;
840: do {
841: k--;
842: } while ((r_str(ppb) & 0x40) && (k));
843: if (!k)
844: return 0;
845:
846: w_dtr(ppb, (1 << target));
847: w_ctr(ppb, 0xe);
848: w_ctr(ppb, 0xc);
849: w_dtr(ppb, 0x80); /* This is NOT the initator */
850: w_ctr(ppb, 0x8);
851:
852: k = PPA_SELECT_TMO;
853: do {
854: k--;
855: }
856: while (!(r_str(ppb) & 0x40) && (k));
857: if (!k)
858: return 0;
859:
860: return 1;
861: }
862:
863: /*
864: * This is based on a trace of what the Iomega DOS 'guest' driver does.
865: * I've tried several different kinds of parallel ports with guest and
866: * coded this to react in the same ways that it does.
867: *
868: * The return value from this function is just a hint about where the
869: * handshaking failed.
870: *
871: */
872: static int ppa_init(int host_no)
873: {
874: int retv;
875: unsigned short ppb = PPA_BASE(host_no);
876:
877: ppa_disconnect(host_no);
878: ppa_connect(host_no, CONNECT_NORMAL);
879:
880: retv = 2; /* Failed */
881:
882: w_ctr(ppb, 0xe);
883: if ((r_str(ppb) & 0x08) == 0x08)
884: retv--;
885:
886: w_ctr(ppb, 0xc);
887: if ((r_str(ppb) & 0x08) == 0x00)
888: retv--;
889:
890: /* This is a SCSI BUS reset signal */
891: if (!retv) {
892: w_dtr(ppb, 0x40);
893: w_ctr(ppb, 0x08);
894: udelay(30);
895: w_ctr(ppb, 0x0c);
896: udelay(1000); /* Allow devices to settle down */
897: }
898: ppa_disconnect(host_no);
899: udelay(1000); /* Another delay to allow devices to settle */
900:
901: if (!retv)
902: retv = device_check(host_no);
903:
904: return retv;
905: }
906:
907: static inline int ppa_send_command(Scsi_Cmnd * cmd)
908: {
909: int host_no = cmd->host->unique_id;
910: int k;
911:
912: w_ctr(PPA_BASE(host_no), 0x0c);
913:
914: for (k = 0; k < cmd->cmd_len; k++)
915: if (!ppa_out(host_no, &cmd->cmnd[k], 1))
916: return 0;
917: return 1;
918: }
919:
920: /*
921: * The bulk flag enables some optimisations in the data transfer loops,
922: * it should be true for any command that transfers data in integral
923: * numbers of sectors.
924: *
925: * The driver appears to remain stable if we speed up the parallel port
926: * i/o in this function, but not elsewhere.
927: */
928: static int ppa_completion(Scsi_Cmnd * cmd)
929: {
930: /* Return codes:
931: * -1 Error
932: * 0 Told to schedule
933: * 1 Finished data transfer
934: */
935: int host_no = cmd->host->unique_id;
936: unsigned short ppb = PPA_BASE(host_no);
937: unsigned long start_jiffies = jiffies;
938:
939: unsigned char r, v;
940: int fast, bulk, status;
941:
942: v = cmd->cmnd[0];
943: bulk = ((v == READ_6) ||
944: (v == READ_10) ||
945: (v == WRITE_6) ||
946: (v == WRITE_10));
947:
948: /*
949: * We only get here if the drive is ready to comunicate,
950: * hence no need for a full ppa_wait.
951: */
952: r = (r_str(ppb) & 0xf0);
953:
954: while (r != (unsigned char) 0xf0) {
955: /*
956: * If we have been running for more than a full timer tick
957: * then take a rest.
958: */
959: if (jiffies > start_jiffies + 1)
960: return 0;
961:
962: if (((r & 0xc0) != 0xc0) || (cmd->SCp.this_residual <= 0)) {
963: ppa_fail(host_no, DID_ERROR);
964: return -1; /* ERROR_RETURN */
965: }
966: /* determine if we should use burst I/O */ fast = (bulk && (cmd->SCp.this_residual >= PPA_BURST_SIZE))
967: ? PPA_BURST_SIZE : 1;
968:
969: if (r == (unsigned char) 0xc0)
970: status = ppa_out(host_no, cmd->SCp.ptr, fast);
971: else
972: status = ppa_in(host_no, cmd->SCp.ptr, fast);
973:
974: cmd->SCp.ptr += fast;
975: cmd->SCp.this_residual -= fast;
976:
977: if (!status) {
978: ppa_fail(host_no, DID_BUS_BUSY);
979: return -1; /* ERROR_RETURN */
980: }
981: if (cmd->SCp.buffer && !cmd->SCp.this_residual) {
982: /* if scatter/gather, advance to the next segment */
983: if (cmd->SCp.buffers_residual--) {
984: cmd->SCp.buffer++;
985: cmd->SCp.this_residual = cmd->SCp.buffer->length;
986: cmd->SCp.ptr = cmd->SCp.buffer->address;
987: }
988: }
989: /* Now check to see if the drive is ready to comunicate */
990: r = (r_str(ppb) & 0xf0);
991: /* If not, drop back down to the scheduler and wait a timer tick */
992: if (!(r & 0x80))
993: return 0;
994: }
995: return 1; /* FINISH_RETURN */
996: }
997:
998: /*
999: * Since the PPA itself doesn't generate interrupts, we use
1000: * the scheduler's task queue to generate a stream of call-backs and
1001: * complete the request when the drive is ready.
1002: */
1003: static void ppa_interrupt(void *data)
1004: {
1005: ppa_struct *tmp = (ppa_struct *) data;
1006: Scsi_Cmnd *cmd = tmp->cur_cmd;
1007:
1008: if (!cmd) {
1009: printk("PPA: bug in ppa_interrupt\n");
1010: return;
1011: }
1012: if (ppa_engine(tmp, cmd)) {
1013: tmp->ppa_tq.data = (void *) tmp;
1014: tmp->ppa_tq.sync = 0;
1015: queue_task(&tmp->ppa_tq, &tq_timer);
1016: return;
1017: }
1018: /* Command must of completed hence it is safe to let go... */
1019: #if PPA_DEBUG > 0
1020: switch ((cmd->result >> 16) & 0xff) {
1021: case DID_OK:
1022: break;
1023: case DID_NO_CONNECT:
1024: printk("ppa: no device at SCSI ID %i\n", cmd->target);
1025: break;
1026: case DID_BUS_BUSY:
1027: printk("ppa: BUS BUSY - EPP timeout detected\n");
1028: break;
1029: case DID_TIME_OUT:
1030: printk("ppa: unknown timeout\n");
1031: break;
1032: case DID_ABORT:
1033: printk("ppa: told to abort\n");
1034: break;
1035: case DID_PARITY:
1036: printk("ppa: parity error (???)\n");
1037: break;
1038: case DID_ERROR:
1039: printk("ppa: internal driver error\n");
1040: break;
1041: case DID_RESET:
1042: printk("ppa: told to reset device\n");
1043: break;
1044: case DID_BAD_INTR:
1045: printk("ppa: bad interrupt (???)\n");
1046: break;
1047: default:
1048: printk("ppa: bad return code (%02x)\n", (cmd->result >> 16) & 0xff);
1049: }
1050: #endif
1051:
1052: if (cmd->SCp.phase > 1)
1053: ppa_disconnect(cmd->host->unique_id);
1054:
1055: tmp->cur_cmd = 0;
1056: cmd->scsi_done(cmd);
1057: return;
1058: }
1059:
1060: static int ppa_engine(ppa_struct * tmp, Scsi_Cmnd * cmd)
1061: {
1062: int host_no = cmd->host->unique_id;
1063: unsigned short ppb = PPA_BASE(host_no);
1064: unsigned char l = 0, h = 0;
1065: int retv;
1066:
1067: /* First check for any errors that may have occurred
1068: * Here we check for internal errors
1069: */
1070: if (tmp->failed)
1071: return 0;
1072:
1073: switch (cmd->SCp.phase) {
1074: case 0: /* Phase 0 - Waiting for parport */
1075: if ((jiffies - tmp->jstart) > HZ) {
1076: /*
1077: * We waited more than a second
1078: * for parport to call us
1079: */
1080: ppa_fail(host_no, DID_BUS_BUSY);
1081: return 0;
1082: }
1083: return 1; /* wait until ppa_wakeup claims parport */
1084: case 1: /* Phase 1 - Connected */
1085: { /* Perform a sanity check for cable unplugged */
1086: int retv = 2; /* Failed */
1087:
1088: ppa_connect(host_no, CONNECT_EPP_MAYBE);
1089:
1090: w_ctr(ppb, 0xe);
1091: if ((r_str(ppb) & 0x08) == 0x08)
1092: retv--;
1093:
1094: w_ctr(ppb, 0xc);
1095: if ((r_str(ppb) & 0x08) == 0x00)
1096: retv--;
1097:
1098: if (retv)
1099: if ((jiffies - tmp->jstart) > (1 * HZ)) {
1100: printk("ppa: Parallel port cable is unplugged!!\n");
1101: ppa_fail(host_no, DID_BUS_BUSY);
1102: return 0;
1103: } else {
1104: ppa_disconnect(host_no);
1105: return 1; /* Try again in a jiffy */
1106: }
1107: cmd->SCp.phase++;
1108: }
1109:
1110: case 2: /* Phase 2 - We are now talking to the scsi bus */
1111: if (!ppa_select(host_no, cmd->target)) {
1112: ppa_fail(host_no, DID_NO_CONNECT);
1113: return 0;
1114: }
1115: cmd->SCp.phase++;
1116:
1117: case 3: /* Phase 3 - Ready to accept a command */
1118: w_ctr(ppb, 0x0c);
1119: if (!(r_str(ppb) & 0x80))
1120: return 1;
1121:
1122: if (!ppa_send_command(cmd))
1123: return 0;
1124: cmd->SCp.phase++;
1125:
1126: case 4: /* Phase 4 - Setup scatter/gather buffers */
1127: if (cmd->use_sg) {
1128: /* if many buffers are available, start filling the first */
1129: cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer;
1130: cmd->SCp.this_residual = cmd->SCp.buffer->length;
1131: cmd->SCp.ptr = cmd->SCp.buffer->address;
1132: } else {
1133: /* else fill the only available buffer */
1134: cmd->SCp.buffer = NULL;
1135: cmd->SCp.this_residual = cmd->request_bufflen;
1136: cmd->SCp.ptr = cmd->request_buffer;
1137: }
1138: cmd->SCp.buffers_residual = cmd->use_sg;
1139: cmd->SCp.phase++;
1140:
1141: case 5: /* Phase 5 - Data transfer stage */
1142: w_ctr(ppb, 0x0c);
1143: if (!(r_str(ppb) & 0x80))
1144: return 1;
1145:
1146: retv = ppa_completion(cmd);
1147: if (retv == -1)
1148: return 0;
1149: if (retv == 0)
1150: return 1;
1151: cmd->SCp.phase++;
1152:
1153: case 6: /* Phase 6 - Read status/message */
1154: cmd->result = DID_OK << 16;
1155: /* Check for data overrun */
1156: if (ppa_wait(host_no) != (unsigned char) 0xf0) {
1157: ppa_fail(host_no, DID_ERROR);
1158: return 0;
1159: }
1160: if (ppa_in(host_no, &l, 1)) { /* read status byte */
1161: /* Check for optional message byte */
1162: if (ppa_wait(host_no) == (unsigned char) 0xf0)
1163: ppa_in(host_no, &h, 1);
1164: cmd->result = (DID_OK << 16) + (h << 8) + (l & STATUS_MASK);
1165: }
1166: return 0; /* Finished */
1167: break;
1168:
1169: default:
1170: printk("ppa: Invalid scsi phase\n");
1171: }
1172: return 0;
1173: }
1174:
1175: int ppa_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
1176: {
1177: int host_no = cmd->host->unique_id;
1178:
1179: if (ppa_hosts[host_no].cur_cmd) {
1180: printk("PPA: bug in ppa_queuecommand\n");
1181: return 0;
1182: }
1183: ppa_hosts[host_no].failed = 0;
1184: ppa_hosts[host_no].jstart = jiffies;
1185: ppa_hosts[host_no].cur_cmd = cmd;
1186: cmd->scsi_done = done;
1187: cmd->result = DID_ERROR << 16; /* default return code */
1188: cmd->SCp.phase = 0; /* bus free */
1189:
1190: ppa_pb_claim(host_no);
1191:
1192: ppa_hosts[host_no].ppa_tq.data = ppa_hosts + host_no;
1193: ppa_hosts[host_no].ppa_tq.sync = 0;
1194: queue_task(&ppa_hosts[host_no].ppa_tq, &tq_immediate);
1195: mark_bh(IMMEDIATE_BH);
1196:
1197: return 0;
1198: }
1199:
1200: /*
1201: * Apparently the disk->capacity attribute is off by 1 sector
1202: * for all disk drives. We add the one here, but it should really
1203: * be done in sd.c. Even if it gets fixed there, this will still
1204: * work.
1205: */
1206: int ppa_biosparam(Disk * disk, kdev_t dev, int ip[])
1207: {
1208: ip[0] = 0x40;
1209: ip[1] = 0x20;
1210: ip[2] = (disk->capacity + 1) / (ip[0] * ip[1]);
1211: if (ip[2] > 1024) {
1212: ip[0] = 0xff;
1213: ip[1] = 0x3f;
1214: ip[2] = (disk->capacity + 1) / (ip[0] * ip[1]);
1215: if (ip[2] > 1023)
1216: ip[2] = 1023;
1217: }
1218: return 0;
1219: }
1220:
1221: int ppa_abort(Scsi_Cmnd * cmd)
1222: {
1223: /*
1224: * There is no method for aborting commands since Iomega
1225: * have tied the SCSI_MESSAGE line high in the interface
1226: */
1227:
1228: switch (cmd->SCp.phase) {
1229: case 0: /* Do not have access to parport */
1230: case 1: /* Have not connected to interface */
1231: cmd->result = DID_ABORT;
1232: cmd->done(cmd);
1233: return SCSI_ABORT_SUCCESS;
1234: break;
1235: default: /* SCSI command sent, can not abort */
1236: return SCSI_ABORT_BUSY;
1237: break;
1238: }
1239: }
1240:
1241: int ppa_reset(Scsi_Cmnd * cmd, unsigned int x)
1242: {
1243: int host_no = cmd->host->unique_id;
1244: int ppb = PPA_BASE(host_no);
1245:
1246: /*
1247: * PHASE1:
1248: * Bring the interface crashing down on whatever is running
1249: * hopefully this will kill the request.
1250: * Bring back up the interface, reset the drive (and anything
1251: * attached for that manner)
1252: */
1253: if (cmd)
1254: if (cmd->SCp.phase)
1255: ppa_disconnect(cmd->host->unique_id);
1256:
1257: ppa_connect(host_no, CONNECT_NORMAL);
1258: w_dtr(ppb, 0x40);
1259: w_ctr(ppb, 0x8);
1260: udelay(30);
1261: w_ctr(ppb, 0xc);
1262: udelay(1000); /* delay for devices to settle down */
1263: ppa_disconnect(host_no);
1264: udelay(1000); /* Additional delay to allow devices to settle down */
1265:
1266: /*
1267: * PHASE2:
1268: * Sanity check for the sake of mid-level driver
1269: */
1270: if (!cmd) {
1271: printk("ppa bus reset called for invalid command.\n");
1272: return SCSI_RESET_NOT_RUNNING;
1273: }
1274: /*
1275: * PHASE3:
1276: * Flag the current command as having died due to reset
1277: */
1278: ppa_connect(host_no, CONNECT_NORMAL);
1279: ppa_fail(host_no, DID_RESET);
1280:
1281: /* Since the command was already on the timer queue ppa_interrupt
1282: * will be called shortly.
1283: */
1284: return SCSI_RESET_PENDING;
1285: }
1286:
1287: static int device_check(int host_no)
1288: {
1289: /* This routine looks for a device and then attempts to use EPP
1290: to send a command. If all goes as planned then EPP is available. */
1291:
1292: static char cmd[6] =
1293: {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
1294: int loop, old_mode, status, k, ppb = PPA_BASE(host_no);
1295: unsigned char l;
1296:
1297: old_mode = ppa_hosts[host_no].mode;
1298: for (loop = 0; loop < 8; loop++) {
1299: /* Attempt to use EPP for Test Unit Ready */
1300: if ((ppb & 0x0007) == 0x0000)
1301: ppa_hosts[host_no].mode = PPA_EPP_32;
1302:
1303: second_pass:
1304: ppa_connect(host_no, CONNECT_EPP_MAYBE);
1305: /* Select SCSI device */
1306: if (!ppa_select(host_no, loop)) {
1307: ppa_disconnect(host_no);
1308: continue;
1309: }
1310: printk("ppa: Found device at ID %i, Attempting to use %s\n", loop,
1311: PPA_MODE_STRING[ppa_hosts[host_no].mode]);
1312:
1313: /* Send SCSI command */
1314: status = 1;
1315: w_ctr(ppb, 0x0c);
1316: for (l = 0; (l < 6) && (status); l++)
1317: status = ppa_out(host_no, cmd, 1);
1318:
1319: if (!status) {
1320: ppa_disconnect(host_no);
1321: ppa_connect(host_no, CONNECT_EPP_MAYBE);
1322: w_dtr(ppb, 0x40);
1323: w_ctr(ppb, 0x08);
1324: udelay(30);
1325: w_ctr(ppb, 0x0c);
1326: udelay(1000);
1327: ppa_disconnect(host_no);
1328: udelay(1000);
1329: if (ppa_hosts[host_no].mode == PPA_EPP_32) {
1330: ppa_hosts[host_no].mode = old_mode;
1331: goto second_pass;
1332: }
1333: printk("ppa: Unable to establish communication, aborting driver load.\n");
1334: return 1;
1335: }
1336: w_ctr(ppb, 0x0c);
1337: k = 1000000; /* 1 Second */
1338: do {
1339: l = r_str(ppb);
1340: k--;
1341: udelay(1);
1342: } while (!(l & 0x80) && (k));
1343:
1344: l &= 0xf0;
1345:
1346: if (l != 0xf0) {
1347: ppa_disconnect(host_no);
1348: ppa_connect(host_no, CONNECT_EPP_MAYBE);
1349: w_dtr(ppb, 0x40);
1350: w_ctr(ppb, 0x08);
1351: udelay(30);
1352: w_ctr(ppb, 0x0c);
1353: udelay(1000);
1354: ppa_disconnect(host_no);
1355: udelay(1000);
1356: if (ppa_hosts[host_no].mode == PPA_EPP_32) {
1357: ppa_hosts[host_no].mode = old_mode;
1358: goto second_pass;
1359: }
1360: printk("ppa: Unable to establish communication, aborting driver load.\n");
1361: return 1;
1362: }
1363: ppa_disconnect(host_no);
1364: printk("ppa: Communication established with ID %i using %s\n", loop,
1365: PPA_MODE_STRING[ppa_hosts[host_no].mode]);
1366: return 0;
1367: }
1368: printk("ppa: No devices found, aborting driver load.\n");
1369: return 1;
1370: }
1371:
1372: #define PPA_ID "ppa: "
1373:
1374: int port_probe(unsigned short port)
1375: {
1376: int retv = 0;
1377: unsigned char a, b, c;
1378: unsigned int i, j;
1379:
1380:
1381: printk(PPA_ID "Probing port %04x\n", port);
1382:
1383: /* ##### ###### ######
1384: * # # # # # #
1385: * # # # # #
1386: * ##### ###### ######
1387: * # # #
1388: * # # # #
1389: * ##### # #
1390: */
1391:
1392: outb(0x0c, port + 0x402);
1393: outb(0x0c, port + 0x002);
1394: outb(0x55, port);
1395: a = inb(port);
1396: if (a != 0x55)
1397: return retv;
1398: printk(PPA_ID " SPP port present\n");
1399:
1400: retv += PPA_PROBE_SPP;
1401:
1402: /* ####### ##### ######
1403: * # # # # #
1404: * # # # #
1405: * ##### # ######
1406: * # # #
1407: * # # # #
1408: * ####### ##### #
1409: */
1410:
1411: for (i = 1024; i > 0; i--) { /* clear at most 1k of data from FIFO */
1412: a = inb(port + 0x402);
1413: if ((a & 0x03) == 0x03)
1414: goto no_ecp;
1415: if (a & 0x01)
1416: break;
1417: inb(port + 0x400); /* Remove byte from FIFO */
1418: }
1419:
1420: if (i <= 0)
1421: goto no_ecp;
1422:
1423: b = a ^ 3;
1424: outb(b, port + 0x402);
1425: c = inb(port + 0x402);
1426:
1427: if (a == c) {
1428: outb(0xc0, port + 0x402); /* FIFO test */
1429: j = 0;
1430: while (!(inb(port + 0x402) & 0x01) && (j < 1024)) {
1431: inb(port + 0x400);
1432: j++;
1433: }
1434: if (j >= 1024)
1435: goto no_ecp;
1436: i = 0;
1437: j = 0;
1438: while (!(inb(port + 0x402) & 0x02) && (j < 1024)) {
1439: outb(0x00, port + 0x400);
1440: i++;
1441: j++;
1442: }
1443: if (j >= 1024)
1444: goto no_ecp;
1445: j = 0;
1446: while (!(inb(port + 0x402) & 0x01) && (j < 1024)) {
1447: inb(port + 0x400);
1448: j++;
1449: }
1450: if (j >= 1024)
1451: goto no_ecp;
1452: printk(PPA_ID " ECP with a %i byte FIFO present\n", i);
1453:
1454: retv += PPA_PROBE_ECR;
1455: }
1456: /* ###### ##### #####
1457: * # # # # # #
1458: * # # # #
1459: * ###### ##### #####
1460: * # # #
1461: * # # # #
1462: * # ##### #######
1463: */
1464:
1465: no_ecp:
1466: if (retv & PPA_PROBE_ECR)
1467: outb(0x20, port + 0x402);
1468:
1469: outb(0x55, port);
1470: outb(0x0c, port + 2);
1471: a = inb(port);
1472: outb(0x55, port);
1473: outb(0x2c, port + 2);
1474: b = inb(port);
1475: if (a != b) {
1476: printk(PPA_ID " PS/2 bidirectional port present\n");
1477: retv += PPA_PROBE_PS2;
1478: }
1479: /* ####### ###### ######
1480: * # # # # #
1481: * # # # # #
1482: * ##### ###### ######
1483: * # # #
1484: * # # #
1485: * ####### # #
1486: */
1487:
1488: if (port & 0x007) {
1489: printk(PPA_ID " EPP not supported at this address\n");
1490: return retv;
1491: }
1492: if (retv & PPA_PROBE_ECR) {
1493: for (i = 0x00; i < 0x80; i += 0x20) {
1494: outb(i, port + 0x402);
1495:
1496: a = inb(port + 1);
1497: outb(a, port + 1);
1498: outb(a & 0xfe, port + 1);
1499: a = inb(port + 1);
1500: if (!(a & 0x01)) {
1501: printk(PPA_ID " Failed Intel bug check. (Phony EPP in ECP)\n");
1502: return retv;
1503: }
1504: }
1505: printk(PPA_ID " Passed Intel bug check.\n");
1506: outb(0x80, port + 0x402);
1507: }
1508: a = inb(port + 1);
1509: outb(a, port + 1);
1510: outb(a & 0xfe, port + 1);
1511: a = inb(port + 1);
1512:
1513: if (a & 0x01) {
1514: outb(0x0c, port + 0x402);
1515: outb(0x0c, port + 0x002);
1516: return retv;
1517: }
1518:
1519: outb(0x04, port + 2);
1520: inb(port + 4);
1521: a = inb(port + 1);
1522: outb(a, port + 1);
1523: outb(a & 0xfe, port + 1);
1524:
1525: if (a & 0x01) {
1526: printk(PPA_ID " EPP 1.9 with hardware direction protocol\n");
1527: retv += PPA_PROBE_EPP19;
1528: } else {
1529: /* The EPP timeout bit was not set, this could either be:
1530: * EPP 1.7
1531: * EPP 1.9 with software direction
1532: */
1533: outb(0x24, port + 2);
1534: inb(port + 4);
1535: a = inb(port + 1);
1536: outb(a, port + 1);
1537: outb(a & 0xfe, port + 1);
1538: if (a & 0x01) {
1539: printk(PPA_ID " EPP 1.9 with software direction protocol\n");
1540: retv += PPA_PROBE_EPP19;
1541: } else {
1542: printk(PPA_ID " EPP 1.7\n");
1543: retv += PPA_PROBE_EPP17;
1544: }
1545: }
1546:
1547: outb(0x0c, port + 0x402);
1548: outb(0x0c, port + 0x002);
1549: return retv;
1550: }
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