1 /*
2  *	linux/arch/alpha/kernel/core_mcpcia.c
3  *
4  * Based on code written by David A Rusling (david.rusling@reo.mts.dec.com).
5  *
6  * Code common to all MCbus-PCI Adaptor core logic chipsets
7  */
8 
9 #define __EXTERN_INLINE inline
10 #include <asm/io.h>
11 #include <asm/core_mcpcia.h>
12 #undef __EXTERN_INLINE
13 
14 #include <linux/types.h>
15 #include <linux/pci.h>
16 #include <linux/sched.h>
17 #include <linux/init.h>
18 #include <linux/delay.h>
19 
20 #include <asm/ptrace.h>
21 
22 #include "proto.h"
23 #include "pci_impl.h"
24 
25 /*
26  * NOTE: Herein lie back-to-back mb instructions.  They are magic.
27  * One plausible explanation is that the i/o controller does not properly
28  * handle the system transaction.  Another involves timing.  Ho hum.
29  */
30 
31 /*
32  * BIOS32-style PCI interface:
33  */
34 
35 #define DEBUG_CFG 0
36 
37 #if DEBUG_CFG
38 # define DBG_CFG(args)	printk args
39 #else
40 # define DBG_CFG(args)
41 #endif
42 
43 /*
44  * Given a bus, device, and function number, compute resulting
45  * configuration space address and setup the MCPCIA_HAXR2 register
46  * accordingly.  It is therefore not safe to have concurrent
47  * invocations to configuration space access routines, but there
48  * really shouldn't be any need for this.
49  *
50  * Type 0:
51  *
52  *  3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
53  *  3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
54  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
55  * | | |D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|0|
56  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
57  *
58  *	31:11	Device select bit.
59  * 	10:8	Function number
60  * 	 7:2	Register number
61  *
62  * Type 1:
63  *
64  *  3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
65  *  3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
66  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
67  * | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1|
68  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
69  *
70  *	31:24	reserved
71  *	23:16	bus number (8 bits = 128 possible buses)
72  *	15:11	Device number (5 bits)
73  *	10:8	function number
74  *	 7:2	register number
75  *
76  * Notes:
77  *	The function number selects which function of a multi-function device
78  *	(e.g., SCSI and Ethernet).
79  *
80  *	The register selects a DWORD (32 bit) register offset.  Hence it
81  *	doesn't get shifted by 2 bits as we want to "drop" the bottom two
82  *	bits.
83  */
84 
85 static unsigned int
conf_read(unsigned long addr,unsigned char type1,struct pci_controller * hose)86 conf_read(unsigned long addr, unsigned char type1,
87 	  struct pci_controller *hose)
88 {
89 	unsigned long flags;
90 	unsigned long mid = MCPCIA_HOSE2MID(hose->index);
91 	unsigned int stat0, value, cpu;
92 
93 	cpu = smp_processor_id();
94 
95 	local_irq_save(flags);
96 
97 	DBG_CFG(("conf_read(addr=0x%lx, type1=%d, hose=%d)\n",
98 		 addr, type1, mid));
99 
100 	/* Reset status register to avoid losing errors.  */
101 	stat0 = *(vuip)MCPCIA_CAP_ERR(mid);
102 	*(vuip)MCPCIA_CAP_ERR(mid) = stat0;
103 	mb();
104 	*(vuip)MCPCIA_CAP_ERR(mid);
105 	DBG_CFG(("conf_read: MCPCIA_CAP_ERR(%d) was 0x%x\n", mid, stat0));
106 
107 	mb();
108 	draina();
109 	mcheck_expected(cpu) = 1;
110 	mcheck_taken(cpu) = 0;
111 	mcheck_extra(cpu) = mid;
112 	mb();
113 
114 	/* Access configuration space.  */
115 	value = *((vuip)addr);
116 	mb();
117 	mb();  /* magic */
118 
119 	if (mcheck_taken(cpu)) {
120 		mcheck_taken(cpu) = 0;
121 		value = 0xffffffffU;
122 		mb();
123 	}
124 	mcheck_expected(cpu) = 0;
125 	mb();
126 
127 	DBG_CFG(("conf_read(): finished\n"));
128 
129 	local_irq_restore(flags);
130 	return value;
131 }
132 
133 static void
conf_write(unsigned long addr,unsigned int value,unsigned char type1,struct pci_controller * hose)134 conf_write(unsigned long addr, unsigned int value, unsigned char type1,
135 	   struct pci_controller *hose)
136 {
137 	unsigned long flags;
138 	unsigned long mid = MCPCIA_HOSE2MID(hose->index);
139 	unsigned int stat0, cpu;
140 
141 	cpu = smp_processor_id();
142 
143 	local_irq_save(flags);	/* avoid getting hit by machine check */
144 
145 	/* Reset status register to avoid losing errors.  */
146 	stat0 = *(vuip)MCPCIA_CAP_ERR(mid);
147 	*(vuip)MCPCIA_CAP_ERR(mid) = stat0; mb();
148 	*(vuip)MCPCIA_CAP_ERR(mid);
149 	DBG_CFG(("conf_write: MCPCIA CAP_ERR(%d) was 0x%x\n", mid, stat0));
150 
151 	draina();
152 	mcheck_expected(cpu) = 1;
153 	mcheck_extra(cpu) = mid;
154 	mb();
155 
156 	/* Access configuration space.  */
157 	*((vuip)addr) = value;
158 	mb();
159 	mb();  /* magic */
160 	*(vuip)MCPCIA_CAP_ERR(mid); /* read to force the write */
161 	mcheck_expected(cpu) = 0;
162 	mb();
163 
164 	DBG_CFG(("conf_write(): finished\n"));
165 	local_irq_restore(flags);
166 }
167 
168 static int
mk_conf_addr(struct pci_bus * pbus,unsigned int devfn,int where,struct pci_controller * hose,unsigned long * pci_addr,unsigned char * type1)169 mk_conf_addr(struct pci_bus *pbus, unsigned int devfn, int where,
170 	     struct pci_controller *hose, unsigned long *pci_addr,
171 	     unsigned char *type1)
172 {
173 	u8 bus = pbus->number;
174 	unsigned long addr;
175 
176 	DBG_CFG(("mk_conf_addr(bus=%d,devfn=0x%x,hose=%d,where=0x%x,"
177 		 " pci_addr=0x%p, type1=0x%p)\n",
178 		 bus, devfn, hose->index, where, pci_addr, type1));
179 
180 	/* Type 1 configuration cycle for *ALL* busses.  */
181 	*type1 = 1;
182 
183 	if (!pbus->parent) /* No parent means peer PCI bus. */
184 		bus = 0;
185 	addr = (bus << 16) | (devfn << 8) | (where);
186 	addr <<= 5; /* swizzle for SPARSE */
187 	addr |= hose->config_space_base;
188 
189 	*pci_addr = addr;
190 	DBG_CFG(("mk_conf_addr: returning pci_addr 0x%lx\n", addr));
191 	return 0;
192 }
193 
194 static int
mcpcia_read_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 * value)195 mcpcia_read_config(struct pci_bus *bus, unsigned int devfn, int where,
196 		   int size, u32 *value)
197 {
198 	struct pci_controller *hose = bus->sysdata;
199 	unsigned long addr, w;
200 	unsigned char type1;
201 
202 	if (mk_conf_addr(bus, devfn, where, hose, &addr, &type1))
203 		return PCIBIOS_DEVICE_NOT_FOUND;
204 
205 	addr |= (size - 1) * 8;
206 	w = conf_read(addr, type1, hose);
207 	switch (size) {
208 	case 1:
209 		*value = __kernel_extbl(w, where & 3);
210 		break;
211 	case 2:
212 		*value = __kernel_extwl(w, where & 3);
213 		break;
214 	case 4:
215 		*value = w;
216 		break;
217 	}
218 	return PCIBIOS_SUCCESSFUL;
219 }
220 
221 static int
mcpcia_write_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 value)222 mcpcia_write_config(struct pci_bus *bus, unsigned int devfn, int where,
223 		    int size, u32 value)
224 {
225 	struct pci_controller *hose = bus->sysdata;
226 	unsigned long addr;
227 	unsigned char type1;
228 
229 	if (mk_conf_addr(bus, devfn, where, hose, &addr, &type1))
230 		return PCIBIOS_DEVICE_NOT_FOUND;
231 
232 	addr |= (size - 1) * 8;
233 	value = __kernel_insql(value, where & 3);
234 	conf_write(addr, value, type1, hose);
235 	return PCIBIOS_SUCCESSFUL;
236 }
237 
238 struct pci_ops mcpcia_pci_ops =
239 {
240 	.read =		mcpcia_read_config,
241 	.write =	mcpcia_write_config,
242 };
243 
244 void
mcpcia_pci_tbi(struct pci_controller * hose,dma_addr_t start,dma_addr_t end)245 mcpcia_pci_tbi(struct pci_controller *hose, dma_addr_t start, dma_addr_t end)
246 {
247 	wmb();
248 	*(vuip)MCPCIA_SG_TBIA(MCPCIA_HOSE2MID(hose->index)) = 0;
249 	mb();
250 }
251 
252 static int __init
mcpcia_probe_hose(int h)253 mcpcia_probe_hose(int h)
254 {
255 	int cpu = smp_processor_id();
256 	int mid = MCPCIA_HOSE2MID(h);
257 	unsigned int pci_rev;
258 
259 	/* Gotta be REAL careful.  If hose is absent, we get an mcheck.  */
260 
261 	mb();
262 	mb();
263 	draina();
264 	wrmces(7);
265 
266 	mcheck_expected(cpu) = 2;	/* indicates probing */
267 	mcheck_taken(cpu) = 0;
268 	mcheck_extra(cpu) = mid;
269 	mb();
270 
271 	/* Access the bus revision word. */
272 	pci_rev = *(vuip)MCPCIA_REV(mid);
273 
274 	mb();
275 	mb();  /* magic */
276 	if (mcheck_taken(cpu)) {
277 		mcheck_taken(cpu) = 0;
278 		pci_rev = 0xffffffff;
279 		mb();
280 	}
281 	mcheck_expected(cpu) = 0;
282 	mb();
283 
284 	return (pci_rev >> 16) == PCI_CLASS_BRIDGE_HOST;
285 }
286 
287 static void __init
mcpcia_new_hose(int h)288 mcpcia_new_hose(int h)
289 {
290 	struct pci_controller *hose;
291 	struct resource *io, *mem, *hae_mem;
292 	int mid = MCPCIA_HOSE2MID(h);
293 
294 	hose = alloc_pci_controller();
295 	if (h == 0)
296 		pci_isa_hose = hose;
297 	io = alloc_resource();
298 	mem = alloc_resource();
299 	hae_mem = alloc_resource();
300 
301 	hose->io_space = io;
302 	hose->mem_space = hae_mem;
303 	hose->sparse_mem_base = MCPCIA_SPARSE(mid) - IDENT_ADDR;
304 	hose->dense_mem_base = MCPCIA_DENSE(mid) - IDENT_ADDR;
305 	hose->sparse_io_base = MCPCIA_IO(mid) - IDENT_ADDR;
306 	hose->dense_io_base = 0;
307 	hose->config_space_base = MCPCIA_CONF(mid);
308 	hose->index = h;
309 
310 	io->start = MCPCIA_IO(mid) - MCPCIA_IO_BIAS;
311 	io->end = io->start + 0xffff;
312 	io->name = pci_io_names[h];
313 	io->flags = IORESOURCE_IO;
314 
315 	mem->start = MCPCIA_DENSE(mid) - MCPCIA_MEM_BIAS;
316 	mem->end = mem->start + 0xffffffff;
317 	mem->name = pci_mem_names[h];
318 	mem->flags = IORESOURCE_MEM;
319 
320 	hae_mem->start = mem->start;
321 	hae_mem->end = mem->start + MCPCIA_MEM_MASK;
322 	hae_mem->name = pci_hae0_name;
323 	hae_mem->flags = IORESOURCE_MEM;
324 
325 	if (request_resource(&ioport_resource, io) < 0)
326 		printk(KERN_ERR "Failed to request IO on hose %d\n", h);
327 	if (request_resource(&iomem_resource, mem) < 0)
328 		printk(KERN_ERR "Failed to request MEM on hose %d\n", h);
329 	if (request_resource(mem, hae_mem) < 0)
330 		printk(KERN_ERR "Failed to request HAE_MEM on hose %d\n", h);
331 }
332 
333 static void
mcpcia_pci_clr_err(int mid)334 mcpcia_pci_clr_err(int mid)
335 {
336 	*(vuip)MCPCIA_CAP_ERR(mid);
337 	*(vuip)MCPCIA_CAP_ERR(mid) = 0xffffffff;   /* Clear them all.  */
338 	mb();
339 	*(vuip)MCPCIA_CAP_ERR(mid);  /* Re-read for force write.  */
340 }
341 
342 static void __init
mcpcia_startup_hose(struct pci_controller * hose)343 mcpcia_startup_hose(struct pci_controller *hose)
344 {
345 	int mid = MCPCIA_HOSE2MID(hose->index);
346 	unsigned int tmp;
347 
348 	mcpcia_pci_clr_err(mid);
349 
350 	/*
351 	 * Set up error reporting.
352 	 */
353 	tmp = *(vuip)MCPCIA_CAP_ERR(mid);
354 	tmp |= 0x0006;		/* master/target abort */
355 	*(vuip)MCPCIA_CAP_ERR(mid) = tmp;
356 	mb();
357 	tmp = *(vuip)MCPCIA_CAP_ERR(mid);
358 
359 	/*
360 	 * Set up the PCI->physical memory translation windows.
361 	 *
362 	 * Window 0 is scatter-gather 8MB at 8MB (for isa)
363 	 * Window 1 is scatter-gather (up to) 1GB at 1GB (for pci)
364 	 * Window 2 is direct access 2GB at 2GB
365 	 */
366 	hose->sg_isa = iommu_arena_new(hose, 0x00800000, 0x00800000, 0);
367 	hose->sg_pci = iommu_arena_new(hose, 0x40000000,
368 				       size_for_memory(0x40000000), 0);
369 
370 	__direct_map_base = 0x80000000;
371 	__direct_map_size = 0x80000000;
372 
373 	*(vuip)MCPCIA_W0_BASE(mid) = hose->sg_isa->dma_base | 3;
374 	*(vuip)MCPCIA_W0_MASK(mid) = (hose->sg_isa->size - 1) & 0xfff00000;
375 	*(vuip)MCPCIA_T0_BASE(mid) = virt_to_phys(hose->sg_isa->ptes) >> 8;
376 
377 	*(vuip)MCPCIA_W1_BASE(mid) = hose->sg_pci->dma_base | 3;
378 	*(vuip)MCPCIA_W1_MASK(mid) = (hose->sg_pci->size - 1) & 0xfff00000;
379 	*(vuip)MCPCIA_T1_BASE(mid) = virt_to_phys(hose->sg_pci->ptes) >> 8;
380 
381 	*(vuip)MCPCIA_W2_BASE(mid) = __direct_map_base | 1;
382 	*(vuip)MCPCIA_W2_MASK(mid) = (__direct_map_size - 1) & 0xfff00000;
383 	*(vuip)MCPCIA_T2_BASE(mid) = 0;
384 
385 	*(vuip)MCPCIA_W3_BASE(mid) = 0x0;
386 
387 	mcpcia_pci_tbi(hose, 0, -1);
388 
389 	*(vuip)MCPCIA_HBASE(mid) = 0x0;
390 	mb();
391 
392 	*(vuip)MCPCIA_HAE_MEM(mid) = 0U;
393 	mb();
394 	*(vuip)MCPCIA_HAE_MEM(mid); /* read it back. */
395 	*(vuip)MCPCIA_HAE_IO(mid) = 0;
396 	mb();
397 	*(vuip)MCPCIA_HAE_IO(mid);  /* read it back. */
398 }
399 
400 void __init
mcpcia_init_arch(void)401 mcpcia_init_arch(void)
402 {
403 	/* With multiple PCI busses, we play with I/O as physical addrs.  */
404 	ioport_resource.end = ~0UL;
405 
406 	/* Allocate hose 0.  That's the one that all the ISA junk hangs
407 	   off of, from which we'll be registering stuff here in a bit.
408 	   Other hose detection is done in mcpcia_init_hoses, which is
409 	   called from init_IRQ.  */
410 
411 	mcpcia_new_hose(0);
412 }
413 
414 /* This is called from init_IRQ, since we cannot take interrupts
415    before then.  Which means we cannot do this in init_arch.  */
416 
417 void __init
mcpcia_init_hoses(void)418 mcpcia_init_hoses(void)
419 {
420 	struct pci_controller *hose;
421 	int hose_count;
422 	int h;
423 
424 	/* First, find how many hoses we have.  */
425 	hose_count = 0;
426 	for (h = 0; h < MCPCIA_MAX_HOSES; ++h) {
427 		if (mcpcia_probe_hose(h)) {
428 			if (h != 0)
429 				mcpcia_new_hose(h);
430 			hose_count++;
431 		}
432 	}
433 
434 	printk("mcpcia_init_hoses: found %d hoses\n", hose_count);
435 
436 	/* Now do init for each hose.  */
437 	for (hose = hose_head; hose; hose = hose->next)
438 		mcpcia_startup_hose(hose);
439 }
440 
441 static void
mcpcia_print_uncorrectable(struct el_MCPCIA_uncorrected_frame_mcheck * logout)442 mcpcia_print_uncorrectable(struct el_MCPCIA_uncorrected_frame_mcheck *logout)
443 {
444 	struct el_common_EV5_uncorrectable_mcheck *frame;
445 	int i;
446 
447 	frame = &logout->procdata;
448 
449 	/* Print PAL fields */
450 	for (i = 0; i < 24; i += 2) {
451 		printk("  paltmp[%d-%d] = %16lx %16lx\n",
452 		       i, i+1, frame->paltemp[i], frame->paltemp[i+1]);
453 	}
454 	for (i = 0; i < 8; i += 2) {
455 		printk("  shadow[%d-%d] = %16lx %16lx\n",
456 		       i, i+1, frame->shadow[i],
457 		       frame->shadow[i+1]);
458 	}
459 	printk("  Addr of excepting instruction  = %16lx\n",
460 	       frame->exc_addr);
461 	printk("  Summary of arithmetic traps    = %16lx\n",
462 	       frame->exc_sum);
463 	printk("  Exception mask                 = %16lx\n",
464 	       frame->exc_mask);
465 	printk("  Base address for PALcode       = %16lx\n",
466 	       frame->pal_base);
467 	printk("  Interrupt Status Reg           = %16lx\n",
468 	       frame->isr);
469 	printk("  CURRENT SETUP OF EV5 IBOX      = %16lx\n",
470 	       frame->icsr);
471 	printk("  I-CACHE Reg %s parity error   = %16lx\n",
472 	       (frame->ic_perr_stat & 0x800L) ?
473 	       "Data" : "Tag",
474 	       frame->ic_perr_stat);
475 	printk("  D-CACHE error Reg              = %16lx\n",
476 	       frame->dc_perr_stat);
477 	if (frame->dc_perr_stat & 0x2) {
478 		switch (frame->dc_perr_stat & 0x03c) {
479 		case 8:
480 			printk("    Data error in bank 1\n");
481 			break;
482 		case 4:
483 			printk("    Data error in bank 0\n");
484 			break;
485 		case 20:
486 			printk("    Tag error in bank 1\n");
487 			break;
488 		case 10:
489 			printk("    Tag error in bank 0\n");
490 			break;
491 		}
492 	}
493 	printk("  Effective VA                   = %16lx\n",
494 	       frame->va);
495 	printk("  Reason for D-stream            = %16lx\n",
496 	       frame->mm_stat);
497 	printk("  EV5 SCache address             = %16lx\n",
498 	       frame->sc_addr);
499 	printk("  EV5 SCache TAG/Data parity     = %16lx\n",
500 	       frame->sc_stat);
501 	printk("  EV5 BC_TAG_ADDR                = %16lx\n",
502 	       frame->bc_tag_addr);
503 	printk("  EV5 EI_ADDR: Phys addr of Xfer = %16lx\n",
504 	       frame->ei_addr);
505 	printk("  Fill Syndrome                  = %16lx\n",
506 	       frame->fill_syndrome);
507 	printk("  EI_STAT reg                    = %16lx\n",
508 	       frame->ei_stat);
509 	printk("  LD_LOCK                        = %16lx\n",
510 	       frame->ld_lock);
511 }
512 
513 static void
mcpcia_print_system_area(unsigned long la_ptr)514 mcpcia_print_system_area(unsigned long la_ptr)
515 {
516 	struct el_common *frame;
517 	struct pci_controller *hose;
518 
519 	struct IOD_subpacket {
520 	  unsigned long base;
521 	  unsigned int whoami;
522 	  unsigned int rsvd1;
523 	  unsigned int pci_rev;
524 	  unsigned int cap_ctrl;
525 	  unsigned int hae_mem;
526 	  unsigned int hae_io;
527 	  unsigned int int_ctl;
528 	  unsigned int int_reg;
529 	  unsigned int int_mask0;
530 	  unsigned int int_mask1;
531 	  unsigned int mc_err0;
532 	  unsigned int mc_err1;
533 	  unsigned int cap_err;
534 	  unsigned int rsvd2;
535 	  unsigned int pci_err1;
536 	  unsigned int mdpa_stat;
537 	  unsigned int mdpa_syn;
538 	  unsigned int mdpb_stat;
539 	  unsigned int mdpb_syn;
540 	  unsigned int rsvd3;
541 	  unsigned int rsvd4;
542 	  unsigned int rsvd5;
543 	} *iodpp;
544 
545 	frame = (struct el_common *)la_ptr;
546 	iodpp = (struct IOD_subpacket *) (la_ptr + frame->sys_offset);
547 
548 	for (hose = hose_head; hose; hose = hose->next, iodpp++) {
549 
550 	  printk("IOD %d Register Subpacket - Bridge Base Address %16lx\n",
551 		 hose->index, iodpp->base);
552 	  printk("  WHOAMI      = %8x\n", iodpp->whoami);
553 	  printk("  PCI_REV     = %8x\n", iodpp->pci_rev);
554 	  printk("  CAP_CTRL    = %8x\n", iodpp->cap_ctrl);
555 	  printk("  HAE_MEM     = %8x\n", iodpp->hae_mem);
556 	  printk("  HAE_IO      = %8x\n", iodpp->hae_io);
557 	  printk("  INT_CTL     = %8x\n", iodpp->int_ctl);
558 	  printk("  INT_REG     = %8x\n", iodpp->int_reg);
559 	  printk("  INT_MASK0   = %8x\n", iodpp->int_mask0);
560 	  printk("  INT_MASK1   = %8x\n", iodpp->int_mask1);
561 	  printk("  MC_ERR0     = %8x\n", iodpp->mc_err0);
562 	  printk("  MC_ERR1     = %8x\n", iodpp->mc_err1);
563 	  printk("  CAP_ERR     = %8x\n", iodpp->cap_err);
564 	  printk("  PCI_ERR1    = %8x\n", iodpp->pci_err1);
565 	  printk("  MDPA_STAT   = %8x\n", iodpp->mdpa_stat);
566 	  printk("  MDPA_SYN    = %8x\n", iodpp->mdpa_syn);
567 	  printk("  MDPB_STAT   = %8x\n", iodpp->mdpb_stat);
568 	  printk("  MDPB_SYN    = %8x\n", iodpp->mdpb_syn);
569 	}
570 }
571 
572 void
mcpcia_machine_check(unsigned long vector,unsigned long la_ptr)573 mcpcia_machine_check(unsigned long vector, unsigned long la_ptr)
574 {
575 	struct el_MCPCIA_uncorrected_frame_mcheck *mchk_logout;
576 	unsigned int cpu = smp_processor_id();
577 	int expected;
578 
579 	mchk_logout = (struct el_MCPCIA_uncorrected_frame_mcheck *)la_ptr;
580 	expected = mcheck_expected(cpu);
581 
582 	mb();
583 	mb();  /* magic */
584 	draina();
585 
586 	switch (expected) {
587 	case 0:
588 	    {
589 		/* FIXME: how do we figure out which hose the
590 		   error was on?  */
591 		struct pci_controller *hose;
592 		for (hose = hose_head; hose; hose = hose->next)
593 			mcpcia_pci_clr_err(MCPCIA_HOSE2MID(hose->index));
594 		break;
595 	    }
596 	case 1:
597 		mcpcia_pci_clr_err(mcheck_extra(cpu));
598 		break;
599 	default:
600 		/* Otherwise, we're being called from mcpcia_probe_hose
601 		   and there's no hose clear an error from.  */
602 		break;
603 	}
604 
605 	wrmces(0x7);
606 	mb();
607 
608 	process_mcheck_info(vector, la_ptr, "MCPCIA", expected != 0);
609 	if (!expected && vector != 0x620 && vector != 0x630) {
610 		mcpcia_print_uncorrectable(mchk_logout);
611 		mcpcia_print_system_area(la_ptr);
612 	}
613 }
614