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1 /*****************************************************************************/
2
3 /*
4 * comemlite.c -- PCI access code for embedded CO-MEM Lite PCI controller.
5 *
6 * (C) Copyright 1999-2003, Greg Ungerer (gerg@snapgear.com).
7 * (C) Copyright 2000, Lineo (www.lineo.com)
8 */
9
10 /*****************************************************************************/
11
12 #include <linux/kernel.h>
13 #include <linux/types.h>
14 #include <linux/pci.h>
15 #include <linux/ptrace.h>
16 #include <linux/spinlock.h>
17 #include <linux/interrupt.h>
18 #include <linux/sched.h>
19 #include <asm/coldfire.h>
20 #include <asm/mcfsim.h>
21 #include <asm/irq.h>
22 #include <asm/anchor.h>
23
24 #ifdef CONFIG_eLIA
25 #include <asm/elia.h>
26 #endif
27
28 /*****************************************************************************/
29
30 /*
31 * Debug configuration defines. DEBUGRES sets debugging output for
32 * the resource allocation phase. DEBUGPCI traces on pcibios_ function
33 * calls, and DEBUGIO traces all accesses to devices on the PCI bus.
34 */
35 /*#define DEBUGRES 1*/
36 /*#define DEBUGPCI 1*/
37 /*#define DEBUGIO 1*/
38
39 /*****************************************************************************/
40
41 /*
42 * PCI markers for bus present and active slots.
43 */
44 int pci_bus_is_present = 0;
45 unsigned long pci_slotmask = 0;
46
47 /*
48 * We may or may not need to swap the bytes of PCI bus tranfers.
49 * The endianess is re-roder automatically by the CO-MEM, but it
50 * will get the wrong byte order for a pure data stream.
51 */
52 #define pci_byteswap 0
53
54
55 /*
56 * Resource tracking. The CO-MEM part creates a virtual address
57 * space that all the PCI devices live in - it is not in any way
58 * directly mapped into the ColdFire address space. So we can
59 * really assign any resources we like to devices, as long as
60 * they do not clash with other PCI devices.
61 */
62 unsigned int pci_iobase = PCIBIOS_MIN_IO; /* Arbitrary start address */
63 unsigned int pci_membase = PCIBIOS_MIN_MEM; /* Arbitrary start address */
64
65 #define PCI_MINIO 0x100 /* 256 byte minimum I/O */
66 #define PCI_MINMEM 0x00010000 /* 64k minimum chunk */
67
68 /*
69 * The CO-MEM's shared memory segment is visible inside the PCI
70 * memory address space. We need to keep track of the address that
71 * this is mapped at, to setup the bus masters pointers.
72 */
73 unsigned int pci_shmemaddr;
74
75 /*****************************************************************************/
76
77 void pci_interrupt(int irq, void *id, struct pt_regs *fp);
78
79 /*****************************************************************************/
80
81 /*
82 * Some platforms have custom ways of reseting the PCI bus.
83 */
84
85 void pci_resetbus(void)
86 {
87 #ifdef CONFIG_eLIA
88 int i;
89
90 #ifdef DEBUGPCI
91 printk(KERN_DEBUG "pci_resetbus()\n");
92 #endif
93
94 *((volatile unsigned short *) (MCF_MBAR+MCFSIM_PADDR)) |= eLIA_PCIRESET;
95 for (i = 0; (i < 1000); i++) {
96 *((volatile unsigned short *) (MCF_MBAR + MCFSIM_PADAT)) =
97 (ppdata | eLIA_PCIRESET);
98 }
99
100
101 *((volatile unsigned short *) (MCF_MBAR + MCFSIM_PADAT)) = ppdata;
102 #endif
103 }
104
105 /*****************************************************************************/
106
107 int pcibios_assign_resource_slot(int slot)
108 {
109 volatile unsigned long *rp;
110 volatile unsigned char *ip;
111 unsigned int idsel, addr, val, align, i;
112 int bar;
113
114 #ifdef DEBUGPCI
115 printk(KERN_INFO "pcibios_assign_resource_slot(slot=%x)\n", slot);
116 #endif
117
118 rp = (volatile unsigned long *) COMEM_BASE;
119 idsel = COMEM_DA_ADDR(0x1 << (slot + 16));
120
121 /* Try to assign resource to each BAR */
122 for (bar = 0; (bar < 6); bar++) {
123 addr = COMEM_PCIBUS + PCI_BASE_ADDRESS_0 + (bar * 4);
124 rp[LREG(COMEM_DAHBASE)] = COMEM_DA_CFGRD | idsel;
125 val = rp[LREG(addr)];
126 #ifdef DEBUGRES
127 printk(KERN_DEBUG "-----------------------------------"
128 "-------------------------------------\n");
129 printk(KERN_DEBUG "BAR[%d]: read=%08x ", bar, val);
130 #endif
131
132 rp[LREG(COMEM_DAHBASE)] = COMEM_DA_CFGWR | idsel;
133 rp[LREG(addr)] = 0xffffffff;
134
135 rp[LREG(COMEM_DAHBASE)] = COMEM_DA_CFGRD | idsel;
136 val = rp[LREG(addr)];
137 #ifdef DEBUGRES
138 printk(KERN_DEBUG "write=%08x ", val);
139 #endif
140 if (val == 0) {
141 #ifdef DEBUGRES
142 printk(KERN_DEBUG "\n");
143 #endif
144 continue;
145 }
146
147 /* Determine space required by BAR */
148 /* FIXME: this should go backwords from 0x80000000... */
149 for (i = 0; (i < 32); i++) {
150 if ((0x1 << i) & (val & 0xfffffffc))
151 break;
152 }
153
154 #ifdef DEBUGRES
155 printk(KERN_DEBUG "size=%08x(%d)\n", (0x1 << i), i);
156 #endif
157 i = 0x1 << i;
158
159 /* Assign a resource */
160 if (val & PCI_BASE_ADDRESS_SPACE_IO) {
161 if (i < PCI_MINIO)
162 i = PCI_MINIO;
163 #ifdef DEBUGRES
164 printk(KERN_DEBUG "BAR[%d]: IO size=%08x iobase=%08x\n",
165 bar, i, pci_iobase);
166 #endif
167 if (i > 0xffff) {
168 /* Invalid size?? */
169 val = 0 | PCI_BASE_ADDRESS_SPACE_IO;
170 #ifdef DEBUGRES
171 printk(KERN_DEBUG "BAR[%d]: too big for IO??\n", bar);
172 #endif
173 } else {
174 /* Check for un-alignment */
175 if ((align = pci_iobase % i))
176 pci_iobase += (i - align);
177 val = pci_iobase | PCI_BASE_ADDRESS_SPACE_IO;
178 pci_iobase += i;
179 }
180 } else {
181 if (i < PCI_MINMEM)
182 i = PCI_MINMEM;
183 #ifdef DEBUGRES
184 printk(KERN_DEBUG "BAR[%d]: MEMORY size=%08x membase=%08x\n",
185 bar, i, pci_membase);
186 #endif
187 /* Check for un-alignment */
188 if ((align = pci_membase % i))
189 pci_membase += (i - align);
190 val = pci_membase | PCI_BASE_ADDRESS_SPACE_MEMORY;
191 pci_membase += i;
192 }
193
194 /* Write resource back into BAR register */
195 rp[LREG(COMEM_DAHBASE)] = COMEM_DA_CFGWR | idsel;
196 rp[LREG(addr)] = val;
197 #ifdef DEBUGRES
198 printk(KERN_DEBUG "BAR[%d]: assigned bar=%08x\n", bar, val);
199 #endif
200 }
201
202 #ifdef DEBUGRES
203 printk(KERN_DEBUG "-----------------------------------"
204 "-------------------------------------\n");
205 #endif
206
207 /* Assign IRQ if one is wanted... */
208 ip = (volatile unsigned char *) (COMEM_BASE + COMEM_PCIBUS);
209 rp[LREG(COMEM_DAHBASE)] = COMEM_DA_CFGRD | idsel;
210
211 addr = (PCI_INTERRUPT_PIN & 0xfc) + (~PCI_INTERRUPT_PIN & 0x03);
212 if (ip[addr]) {
213 rp[LREG(COMEM_DAHBASE)] = COMEM_DA_CFGWR | idsel;
214 addr = (PCI_INTERRUPT_LINE & 0xfc)+(~PCI_INTERRUPT_LINE & 0x03);
215 ip[addr] = 25;
216 #ifdef DEBUGRES
217 printk(KERN_DEBUG "IRQ LINE=25\n");
218 #endif
219 }
220
221 return(0);
222 }
223
224 /*****************************************************************************/
225
226 int pcibios_enable_slot(int slot)
227 {
228 volatile unsigned long *rp;
229 volatile unsigned short *wp;
230 unsigned int idsel, addr;
231 unsigned short cmd;
232
233 #ifdef DEBUGPCI
234 printk(KERN_DEBUG "pcibios_enbale_slot(slot=%x)\n", slot);
235 #endif
236
237 rp = (volatile unsigned long *) COMEM_BASE;
238 wp = (volatile unsigned short *) COMEM_BASE;
239 idsel = COMEM_DA_ADDR(0x1 << (slot + 16));
240
241 /* Get current command settings */
242 addr = COMEM_PCIBUS + PCI_COMMAND;
243 addr = (addr & ~0x3) + (~addr & 0x02);
244 rp[LREG(COMEM_DAHBASE)] = COMEM_DA_CFGRD | idsel;
245 cmd = wp[WREG(addr)];
246 /*val = ((val & 0xff) << 8) | ((val >> 8) & 0xff);*/
247
248 /* Enable I/O and memory accesses to this device */
249 rp[LREG(COMEM_DAHBASE)] = COMEM_DA_CFGWR | idsel;
250 cmd |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
251 wp[WREG(addr)] = cmd;
252
253 return(0);
254 }
255
256 /*****************************************************************************/
257
258 void pcibios_assign_resources(void)
259 {
260 volatile unsigned long *rp;
261 unsigned long sel, id;
262 int slot;
263
264 rp = (volatile unsigned long *) COMEM_BASE;
265
266 /*
267 * Do a quick scan of the PCI bus and see what is here.
268 */
269 for (slot = COMEM_MINDEV; (slot <= COMEM_MAXDEV); slot++) {
270 sel = COMEM_DA_CFGRD | COMEM_DA_ADDR(0x1 << (slot + 16));
271 rp[LREG(COMEM_DAHBASE)] = sel;
272 rp[LREG(COMEM_PCIBUS)] = 0; /* Clear bus */
273 id = rp[LREG(COMEM_PCIBUS)];
274 if ((id != 0) && ((id & 0xffff0000) != (sel & 0xffff0000))) {
275 printk(KERN_INFO "PCI: slot=%d id=%08x\n", slot, (int) id);
276 pci_slotmask |= 0x1 << slot;
277 pcibios_assign_resource_slot(slot);
278 pcibios_enable_slot(slot);
279 }
280 }
281 }
282
283 /*****************************************************************************/
284
285 int pcibios_init(void)
286 {
287 volatile unsigned long *rp;
288 unsigned long sel, id;
289 int slot;
290
291 #ifdef DEBUGPCI
292 printk(KERN_DEBUG "pcibios_init()\n");
293 #endif
294
295 pci_resetbus();
296
297 /*
298 * Do some sort of basic check to see if the CO-MEM part
299 * is present... This works ok, but I think we really need
300 * something better...
301 */
302 rp = (volatile unsigned long *) COMEM_BASE;
303 if ((rp[LREG(COMEM_LBUSCFG)] & 0xff) != 0x50) {
304 printk(KERN_INFO "PCI: no PCI bus present\n");
305 return(0);
306 }
307
308 #ifdef COMEM_BRIDGEDEV
309 /*
310 * Setup the PCI bridge device first. It needs resources too,
311 * so that bus masters can get to its shared memory.
312 */
313 slot = COMEM_BRIDGEDEV;
314 sel = COMEM_DA_CFGRD | COMEM_DA_ADDR(0x1 << (slot + 16));
315 rp[LREG(COMEM_DAHBASE)] = sel;
316 rp[LREG(COMEM_PCIBUS)] = 0; /* Clear bus */
317 id = rp[LREG(COMEM_PCIBUS)];
318 if ((id == 0) || ((id & 0xffff0000) == (sel & 0xffff0000))) {
319 printk(KERN_INFO "PCI: no PCI bus bridge present\n");
320 return(0);
321 }
322
323 printk(KERN_INFO "PCI: bridge device at slot=%d id=%08x\n", slot, (int) id);
324 pci_slotmask |= 0x1 << slot;
325 pci_shmemaddr = pci_membase;
326 pcibios_assign_resource_slot(slot);
327 pcibios_enable_slot(slot);
328 #endif
329
330 pci_bus_is_present = 1;
331
332 /* Get PCI irq for local vectoring */
333 if (request_irq(COMEM_IRQ, pci_interrupt, 0, "PCI bridge", NULL)) {
334 printk(KERN_WARNING "PCI: failed to acquire interrupt %d\n", COMEM_IRQ);
335 } else {
336 mcf_autovector(COMEM_IRQ);
337 }
338
339 pcibios_assign_resources();
340
341 return(0);
342 }
343
344 /*****************************************************************************/
345
346 char *pcibios_setup(char *option)
347 {
348 /* Nothing for us to handle. */
349 return(option);
350 }
351 /*****************************************************************************/
352
353 void pcibios_fixup_bus(struct pci_bus *b)
354 {
355 }
356
357 /*****************************************************************************/
358
359 void pcibios_align_resource(void *data, struct resource *res,
360 resource_size_t size, resource_size_t align)
361 {
362 }
363
364 /*****************************************************************************/
365
366 int pcibios_enable_device(struct pci_dev *dev, int mask)
367 {
368 int slot;
369
370 slot = PCI_SLOT(dev->devfn);
371 if ((dev->bus == 0) && (pci_slotmask & (1 << slot)))
372 pcibios_enable_slot(slot);
373 return(0);
374 }
375
376 /*****************************************************************************/
377
378 /*
379 * Local routines to interrcept the standard I/O and vector handling
380 * code. Don't include this 'till now - initialization code above needs
381 * access to the real code too.
382 */
383 #include <asm/mcfpci.h>
384
385 /*****************************************************************************/
386
387 void pci_outb(unsigned char val, unsigned int addr)
388 {
389 volatile unsigned long *rp;
390 volatile unsigned char *bp;
391
392 #ifdef DEBUGIO
393 printk(KERN_DEBUG "pci_outb(val=%02x,addr=%x)\n", val, addr);
394 #endif
395
396 rp = (volatile unsigned long *) COMEM_BASE;
397 bp = (volatile unsigned char *) COMEM_BASE;
398 rp[LREG(COMEM_DAHBASE)] = COMEM_DA_IOWR | COMEM_DA_ADDR(addr);
399 addr = (addr & ~0x3) + (~addr & 0x03);
400 bp[(COMEM_PCIBUS + COMEM_DA_OFFSET(addr))] = val;
401 }
402
403 /*****************************************************************************/
404
405 void pci_outw(unsigned short val, unsigned int addr)
406 {
407 volatile unsigned long *rp;
408 volatile unsigned short *sp;
409
410 #ifdef DEBUGIO
411 printk(KERN_DEBUG "pci_outw(val=%04x,addr=%x)\n", val, addr);
412 #endif
413
414 rp = (volatile unsigned long *) COMEM_BASE;
415 sp = (volatile unsigned short *) COMEM_BASE;
416 rp[LREG(COMEM_DAHBASE)] = COMEM_DA_IOWR | COMEM_DA_ADDR(addr);
417 addr = (addr & ~0x3) + (~addr & 0x02);
418 if (pci_byteswap)
419 val = ((val & 0xff) << 8) | ((val >> 8) & 0xff);
420 sp[WREG(COMEM_PCIBUS + COMEM_DA_OFFSET(addr))] = val;
421 }
422
423 /*****************************************************************************/
424
425 void pci_outl(unsigned int val, unsigned int addr)
426 {
427 volatile unsigned long *rp;
428 volatile unsigned int *lp;
429
430 #ifdef DEBUGIO
431 printk(KERN_DEBUG "pci_outl(val=%08x,addr=%x)\n", val, addr);
432 #endif
433
434 rp = (volatile unsigned long *) COMEM_BASE;
435 lp = (volatile unsigned int *) COMEM_BASE;
436 rp[LREG(COMEM_DAHBASE)] = COMEM_DA_IOWR | COMEM_DA_ADDR(addr);
437
438 if (pci_byteswap)
439 val = (val << 24) | ((val & 0x0000ff00) << 8) |
440 ((val & 0x00ff0000) >> 8) | (val >> 24);
441
442 lp[LREG(COMEM_PCIBUS + COMEM_DA_OFFSET(addr))] = val;
443 }
444
445 /*****************************************************************************/
446
447 unsigned long pci_blmask[] = {
448 0x000000e0,
449 0x000000d0,
450 0x000000b0,
451 0x00000070
452 };
453
454 unsigned char pci_inb(unsigned int addr)
455 {
456 volatile unsigned long *rp;
457 volatile unsigned char *bp;
458 unsigned long r;
459 unsigned char val;
460
461 #ifdef DEBUGIO
462 printk(KERN_DEBUG "pci_inb(addr=%x)\n", addr);
463 #endif
464
465 rp = (volatile unsigned long *) COMEM_BASE;
466 bp = (volatile unsigned char *) COMEM_BASE;
467
468 r = COMEM_DA_IORD | COMEM_DA_ADDR(addr) | pci_blmask[(addr & 0x3)];
469 rp[LREG(COMEM_DAHBASE)] = r;
470
471 addr = (addr & ~0x3) + (~addr & 0x3);
472 val = bp[(COMEM_PCIBUS + COMEM_DA_OFFSET(addr))];
473 return(val);
474 }
475
476 /*****************************************************************************/
477
478 unsigned long pci_bwmask[] = {
479 0x000000c0,
480 0x000000c0,
481 0x00000030,
482 0x00000030
483 };
484
485 unsigned short pci_inw(unsigned int addr)
486 {
487 volatile unsigned long *rp;
488 volatile unsigned short *sp;
489 unsigned long r;
490 unsigned short val;
491
492 #ifdef DEBUGIO
493 printk(KERN_DEBUG "pci_inw(addr=%x)", addr);
494 #endif
495
496 rp = (volatile unsigned long *) COMEM_BASE;
497 r = COMEM_DA_IORD | COMEM_DA_ADDR(addr) | pci_bwmask[(addr & 0x3)];
498 rp[LREG(COMEM_DAHBASE)] = r;
499
500 sp = (volatile unsigned short *) COMEM_BASE;
501 addr = (addr & ~0x3) + (~addr & 0x02);
502 val = sp[WREG(COMEM_PCIBUS + COMEM_DA_OFFSET(addr))];
503 if (pci_byteswap)
504 val = ((val & 0xff) << 8) | ((val >> 8) & 0xff);
505 #ifdef DEBUGIO
506 printk(KERN_DEBUG "=%04x\n", val);
507 #endif
508 return(val);
509 }
510
511 /*****************************************************************************/
512
513 unsigned int pci_inl(unsigned int addr)
514 {
515 volatile unsigned long *rp;
516 volatile unsigned int *lp;
517 unsigned int val;
518
519 #ifdef DEBUGIO
520 printk(KERN_DEBUG "pci_inl(addr=%x)", addr);
521 #endif
522
523 rp = (volatile unsigned long *) COMEM_BASE;
524 lp = (volatile unsigned int *) COMEM_BASE;
525 rp[LREG(COMEM_DAHBASE)] = COMEM_DA_IORD | COMEM_DA_ADDR(addr);
526 val = lp[LREG(COMEM_PCIBUS + COMEM_DA_OFFSET(addr))];
527
528 if (pci_byteswap)
529 val = (val << 24) | ((val & 0x0000ff00) << 8) |
530 ((val & 0x00ff0000) >> 8) | (val >> 24);
531
532 #ifdef DEBUGIO
533 printk(KERN_DEBUG "=%08x\n", val);
534 #endif
535 return(val);
536 }
537
538 /*****************************************************************************/
539
540 void pci_outsb(void *addr, void *buf, int len)
541 {
542 volatile unsigned long *rp;
543 volatile unsigned char *bp;
544 unsigned char *dp = (unsigned char *) buf;
545 unsigned int a = (unsigned int) addr;
546
547 #ifdef DEBUGIO
548 printk(KERN_DEBUG "pci_outsb(addr=%x,buf=%x,len=%d)\n", (int)addr, (int)buf, len);
549 #endif
550
551 rp = (volatile unsigned long *) COMEM_BASE;
552 rp[LREG(COMEM_DAHBASE)] = COMEM_DA_IOWR | COMEM_DA_ADDR(a);
553
554 a = (a & ~0x3) + (~a & 0x03);
555 bp = (volatile unsigned char *)
556 (COMEM_BASE + COMEM_PCIBUS + COMEM_DA_OFFSET(a));
557
558 while (len--)
559 *bp = *dp++;
560 }
561
562 /*****************************************************************************/
563
564 void pci_outsw(void *addr, void *buf, int len)
565 {
566 volatile unsigned long *rp;
567 volatile unsigned short *wp;
568 unsigned short w, *dp = (unsigned short *) buf;
569 unsigned int a = (unsigned int) addr;
570
571 #ifdef DEBUGIO
572 printk(KERN_DEBUG "pci_outsw(addr=%x,buf=%x,len=%d)\n", (int)addr, (int)buf, len);
573 #endif
574
575 rp = (volatile unsigned long *) COMEM_BASE;
576 rp[LREG(COMEM_DAHBASE)] = COMEM_DA_IOWR | COMEM_DA_ADDR(a);
577
578 a = (a & ~0x3) + (~a & 0x2);
579 wp = (volatile unsigned short *)
580 (COMEM_BASE + COMEM_PCIBUS + COMEM_DA_OFFSET(a));
581
582 while (len--) {
583 w = *dp++;
584 if (pci_byteswap)
585 w = ((w & 0xff) << 8) | ((w >> 8) & 0xff);
586 *wp = w;
587 }
588 }
589
590 /*****************************************************************************/
591
592 void pci_outsl(void *addr, void *buf, int len)
593 {
594 volatile unsigned long *rp;
595 volatile unsigned long *lp;
596 unsigned long l, *dp = (unsigned long *) buf;
597 unsigned int a = (unsigned int) addr;
598
599 #ifdef DEBUGIO
600 printk(KERN_DEBUG "pci_outsl(addr=%x,buf=%x,len=%d)\n", (int)addr, (int)buf, len);
601 #endif
602
603 rp = (volatile unsigned long *) COMEM_BASE;
604 rp[LREG(COMEM_DAHBASE)] = COMEM_DA_IOWR | COMEM_DA_ADDR(a);
605
606 lp = (volatile unsigned long *)
607 (COMEM_BASE + COMEM_PCIBUS + COMEM_DA_OFFSET(a));
608
609 while (len--) {
610 l = *dp++;
611 if (pci_byteswap)
612 l = (l << 24) | ((l & 0x0000ff00) << 8) |
613 ((l & 0x00ff0000) >> 8) | (l >> 24);
614 *lp = l;
615 }
616 }
617
618 /*****************************************************************************/
619
620 void pci_insb(void *addr, void *buf, int len)
621 {
622 volatile unsigned long *rp;
623 volatile unsigned char *bp;
624 unsigned char *dp = (unsigned char *) buf;
625 unsigned int a = (unsigned int) addr;
626
627 #ifdef DEBUGIO
628 printk(KERN_DEBUG "pci_insb(addr=%x,buf=%x,len=%d)\n", (int)addr, (int)buf, len);
629 #endif
630
631 rp = (volatile unsigned long *) COMEM_BASE;
632 rp[LREG(COMEM_DAHBASE)] = COMEM_DA_IORD | COMEM_DA_ADDR(a);
633
634 a = (a & ~0x3) + (~a & 0x03);
635 bp = (volatile unsigned char *)
636 (COMEM_BASE + COMEM_PCIBUS + COMEM_DA_OFFSET(a));
637
638 while (len--)
639 *dp++ = *bp;
640 }
641
642 /*****************************************************************************/
643
644 void pci_insw(void *addr, void *buf, int len)
645 {
646 volatile unsigned long *rp;
647 volatile unsigned short *wp;
648 unsigned short w, *dp = (unsigned short *) buf;
649 unsigned int a = (unsigned int) addr;
650
651 #ifdef DEBUGIO
652 printk(KERN_DEBUG "pci_insw(addr=%x,buf=%x,len=%d)\n", (int)addr, (int)buf, len);
653 #endif
654
655 rp = (volatile unsigned long *) COMEM_BASE;
656 rp[LREG(COMEM_DAHBASE)] = COMEM_DA_IORD | COMEM_DA_ADDR(a);
657
658 a = (a & ~0x3) + (~a & 0x2);
659 wp = (volatile unsigned short *)
660 (COMEM_BASE + COMEM_PCIBUS + COMEM_DA_OFFSET(a));
661
662 while (len--) {
663 w = *wp;
664 if (pci_byteswap)
665 w = ((w & 0xff) << 8) | ((w >> 8) & 0xff);
666 *dp++ = w;
667 }
668 }
669
670 /*****************************************************************************/
671
672 void pci_insl(void *addr, void *buf, int len)
673 {
674 volatile unsigned long *rp;
675 volatile unsigned long *lp;
676 unsigned long l, *dp = (unsigned long *) buf;
677 unsigned int a = (unsigned int) addr;
678
679 #ifdef DEBUGIO
680 printk(KERN_DEBUG "pci_insl(addr=%x,buf=%x,len=%d)\n", (int)addr, (int)buf, len);
681 #endif
682
683 rp = (volatile unsigned long *) COMEM_BASE;
684 rp[LREG(COMEM_DAHBASE)] = COMEM_DA_IORD | COMEM_DA_ADDR(a);
685
686 lp = (volatile unsigned long *)
687 (COMEM_BASE + COMEM_PCIBUS + COMEM_DA_OFFSET(a));
688
689 while (len--) {
690 l = *lp;
691 if (pci_byteswap)
692 l = (l << 24) | ((l & 0x0000ff00) << 8) |
693 ((l & 0x00ff0000) >> 8) | (l >> 24);
694 *dp++ = l;
695 }
696 }
697
698 /*****************************************************************************/
699
700 struct pci_localirqlist {
701 void (*handler)(int, void *, struct pt_regs *);
702 const char *device;
703 void *dev_id;
704 };
705
706 struct pci_localirqlist pci_irqlist[COMEM_MAXPCI];
707
708 /*****************************************************************************/
709
710 int pci_request_irq(unsigned int irq,
711 void (*handler)(int, void *, struct pt_regs *),
712 unsigned long flags, const char *device, void *dev_id)
713 {
714 int i;
715
716 #ifdef DEBUGIO
717 printk(KERN_DEBUG "pci_request_irq(irq=%d,handler=%x,flags=%x,device=%s,"
718 "dev_id=%x)\n", irq, (int) handler, (int) flags, device,
719 (int) dev_id);
720 #endif
721
722 /* Check if this interrupt handler is already lodged */
723 for (i = 0; (i < COMEM_MAXPCI); i++) {
724 if (pci_irqlist[i].handler == handler)
725 return(0);
726 }
727
728 /* Find a free spot to put this handler */
729 for (i = 0; (i < COMEM_MAXPCI); i++) {
730 if (pci_irqlist[i].handler == 0) {
731 pci_irqlist[i].handler = handler;
732 pci_irqlist[i].device = device;
733 pci_irqlist[i].dev_id = dev_id;
734 return(0);
735 }
736 }
737
738 /* Couldn't fit?? */
739 return(1);
740 }
741
742 /*****************************************************************************/
743
744 void pci_free_irq(unsigned int irq, void *dev_id)
745 {
746 int i;
747
748 #ifdef DEBUGIO
749 printk(KERN_DEBUG "pci_free_irq(irq=%d,dev_id=%x)\n", irq, (int) dev_id);
750 #endif
751
752 if (dev_id == (void *) NULL)
753 return;
754
755 /* Check if this interrupt handler is lodged */
756 for (i = 0; (i < COMEM_MAXPCI); i++) {
757 if (pci_irqlist[i].dev_id == dev_id) {
758 pci_irqlist[i].handler = NULL;
759 pci_irqlist[i].device = NULL;
760 pci_irqlist[i].dev_id = NULL;
761 break;
762 }
763 }
764 }
765
766 /*****************************************************************************/
767
768 void pci_interrupt(int irq, void *id, struct pt_regs *fp)
769 {
770 int i;
771
772 #ifdef DEBUGIO
773 printk(KERN_DEBUG "pci_interrupt(irq=%d,id=%x,fp=%x)\n", irq, (int) id, (int) fp);
774 #endif
775
776 for (i = 0; (i < COMEM_MAXPCI); i++) {
777 if (pci_irqlist[i].handler)
778 (*pci_irqlist[i].handler)(irq,pci_irqlist[i].dev_id,fp);
779 }
780 }
781
782 /*****************************************************************************/
783
784 /*
785 * The shared memory region is broken up into contiguous 512 byte
786 * regions for easy allocation... This is not an optimal solution
787 * but it makes allocation and freeing regions really easy.
788 */
789
790 #define PCI_MEMSLOTSIZE 512
791 #define PCI_MEMSLOTS (COMEM_SHMEMSIZE / PCI_MEMSLOTSIZE)
792
793 char pci_shmemmap[PCI_MEMSLOTS];
794
795
796 void *pci_bmalloc(int size)
797 {
798 int i, j, nrslots;
799
800 #ifdef DEBUGIO
801 printk(KERN_DEBUG "pci_bmalloc(size=%d)\n", size);
802 #endif
803
804 if (size <= 0)
805 return((void *) NULL);
806
807 nrslots = (size - 1) / PCI_MEMSLOTSIZE;
808
809 for (i = 0; (i < (PCI_MEMSLOTS-nrslots)); i++) {
810 if (pci_shmemmap[i] == 0) {
811 for (j = i+1; (j < (i+nrslots)); j++) {
812 if (pci_shmemmap[j])
813 goto restart;
814 }
815
816 for (j = i; (j <= i+nrslots); j++)
817 pci_shmemmap[j] = 1;
818 break;
819 }
820 restart:
821 }
822
823 return((void *) (COMEM_BASE + COMEM_SHMEM + (i * PCI_MEMSLOTSIZE)));
824 }
825
826 /*****************************************************************************/
827
828 void pci_bmfree(void *mp, int size)
829 {
830 int i, j, nrslots;
831
832 #ifdef DEBUGIO
833 printk(KERN_DEBUG "pci_bmfree(mp=%x,size=%d)\n", (int) mp, size);
834 #endif
835
836 nrslots = size / PCI_MEMSLOTSIZE;
837 i = (((unsigned long) mp) - (COMEM_BASE + COMEM_SHMEM)) /
838 PCI_MEMSLOTSIZE;
839
840 for (j = i; (j < (i+nrslots)); j++)
841 pci_shmemmap[j] = 0;
842 }
843
844 /*****************************************************************************/
845
846 unsigned long pci_virt_to_bus(volatile void *address)
847 {
848 unsigned long l;
849
850 #ifdef DEBUGIO
851 printk(KERN_DEBUG "pci_virt_to_bus(address=%x)", (int) address);
852 #endif
853
854 l = ((unsigned long) address) - COMEM_BASE;
855 #ifdef DEBUGIO
856 printk(KERN_DEBUG "=%x\n", (int) (l+pci_shmemaddr));
857 #endif
858 return(l + pci_shmemaddr);
859 }
860
861 /*****************************************************************************/
862
863 void *pci_bus_to_virt(unsigned long address)
864 {
865 unsigned long l;
866
867 #ifdef DEBUGIO
868 printk(KERN_DEBUG "pci_bus_to_virt(address=%x)", (int) address);
869 #endif
870
871 l = address - pci_shmemaddr;
872 #ifdef DEBUGIO
873 printk(KERN_DEBUG "=%x\n", (int) (address + COMEM_BASE));
874 #endif
875 return((void *) (address + COMEM_BASE));
876 }
877
878 /*****************************************************************************/
879
880 void pci_bmcpyto(void *dst, void *src, int len)
881 {
882 unsigned long *dp, *sp, val;
883 unsigned char *dcp, *scp;
884 int i, j;
885
886 #ifdef DEBUGIO
887 printk(KERN_DEBUG "pci_bmcpyto(dst=%x,src=%x,len=%d)\n", (int)dst, (int)src, len);
888 #endif
889
890 dp = (unsigned long *) dst;
891 sp = (unsigned long *) src;
892 i = len >> 2;
893
894 #if 0
895 printk(KERN_INFO "DATA:");
896 scp = (unsigned char *) sp;
897 for (i = 0; (i < len); i++) {
898 if ((i % 16) == 0) printk(KERN_INFO "\n%04x: ", i);
899 printk(KERN_INFO "%02x ", *scp++);
900 }
901 printk(KERN_INFO "\n");
902 #endif
903
904 for (j = 0; (i >= 0); i--, j++) {
905 val = *sp++;
906 val = (val << 24) | ((val & 0x0000ff00) << 8) |
907 ((val & 0x00ff0000) >> 8) | (val >> 24);
908 *dp++ = val;
909 }
910
911 if (len & 0x3) {
912 dcp = (unsigned char *) dp;
913 scp = ((unsigned char *) sp) + 3;
914 for (i = 0; (i < (len & 0x3)); i++)
915 *dcp++ = *scp--;
916 }
917 }
918
919 /*****************************************************************************/
920
921 void pci_bmcpyfrom(void *dst, void *src, int len)
922 {
923 unsigned long *dp, *sp, val;
924 unsigned char *dcp, *scp;
925 int i;
926
927 #ifdef DEBUGIO
928 printk(KERN_DEBUG "pci_bmcpyfrom(dst=%x,src=%x,len=%d)\n",(int)dst,(int)src,len);
929 #endif
930
931 dp = (unsigned long *) dst;
932 sp = (unsigned long *) src;
933 i = len >> 2;
934
935 for (; (i >= 0); i--) {
936 val = *sp++;
937 val = (val << 24) | ((val & 0x0000ff00) << 8) |
938 ((val & 0x00ff0000) >> 8) | (val >> 24);
939 *dp++ = val;
940 }
941
942 if (len & 0x3) {
943 dcp = ((unsigned char *) dp) + 3;
944 scp = (unsigned char *) sp;
945 for (i = 0; (i < (len & 0x3)); i++)
946 *dcp++ = *scp--;
947 }
948
949 #if 0
950 printk(KERN_INFO "DATA:");
951 dcp = (unsigned char *) dst;
952 for (i = 0; (i < len); i++) {
953 if ((i % 16) == 0) printk(KERN_INFO "\n%04x: ", i);
954 printk(KERN_INFO "%02x ", *dcp++);
955 }
956 printk(KERN_INFO "\n");
957 #endif
958 }
959
960 /*****************************************************************************/
961
962 void *pci_alloc_consistent(struct pci_dev *dev, size_t size, dma_addr_t *dma_addr)
963 {
964 void *mp;
965 if ((mp = pci_bmalloc(size)) != NULL) {
966 dma_addr = mp - (COMEM_BASE + COMEM_SHMEM);
967 return(mp);
968 }
969 *dma_addr = (dma_addr_t) NULL;
970 return(NULL);
971 }
972
973 /*****************************************************************************/
974
975 void pci_free_consistent(struct pci_dev *dev, size_t size, void *cpu_addr, dma_addr_t dma_addr)
976 {
977 pci_bmfree(cpu_addr, size);
978 }
979
980 /*****************************************************************************/
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