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spi-topcliff-pch: Fix issue for transmitting over 4KByte
[zen-stable.git] / arch / alpha / kernel / core_mcpcia.c
blobda7bcc372f16c50f6cc3f048b6a6956df748aec4
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
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
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
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
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
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 \f
244 void
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 \f
252 static int __init
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
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
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
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
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
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
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
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
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 }