blob: 21c4c299b3d6c823ae92b6f8af86741a86207484 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2**
3** PCI Lower Bus Adapter (LBA) manager
4**
5** (c) Copyright 1999,2000 Grant Grundler
6** (c) Copyright 1999,2000 Hewlett-Packard Company
7**
8** This program is free software; you can redistribute it and/or modify
9** it under the terms of the GNU General Public License as published by
10** the Free Software Foundation; either version 2 of the License, or
11** (at your option) any later version.
12**
13**
14** This module primarily provides access to PCI bus (config/IOport
15** spaces) on platforms with an SBA/LBA chipset. A/B/C/J/L/N-class
16** with 4 digit model numbers - eg C3000 (and A400...sigh).
17**
18** LBA driver isn't as simple as the Dino driver because:
19** (a) this chip has substantial bug fixes between revisions
20** (Only one Dino bug has a software workaround :^( )
21** (b) has more options which we don't (yet) support (DMA hints, OLARD)
22** (c) IRQ support lives in the I/O SAPIC driver (not with PCI driver)
23** (d) play nicely with both PAT and "Legacy" PA-RISC firmware (PDC).
24** (dino only deals with "Legacy" PDC)
25**
26** LBA driver passes the I/O SAPIC HPA to the I/O SAPIC driver.
27** (I/O SAPIC is integratd in the LBA chip).
28**
29** FIXME: Add support to SBA and LBA drivers for DMA hint sets
30** FIXME: Add support for PCI card hot-plug (OLARD).
31*/
32
33#include <linux/delay.h>
34#include <linux/types.h>
35#include <linux/kernel.h>
36#include <linux/spinlock.h>
37#include <linux/init.h> /* for __init and __devinit */
38#include <linux/pci.h>
39#include <linux/ioport.h>
40#include <linux/slab.h>
41#include <linux/smp_lock.h>
42
43#include <asm/byteorder.h>
44#include <asm/pdc.h>
45#include <asm/pdcpat.h>
46#include <asm/page.h>
47#include <asm/system.h>
48
Kyle McMartin1790cf92006-08-24 21:32:49 -040049#include <asm/ropes.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <asm/hardware.h> /* for register_parisc_driver() stuff */
51#include <asm/parisc-device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <asm/io.h> /* read/write stuff */
53
54#undef DEBUG_LBA /* general stuff */
55#undef DEBUG_LBA_PORT /* debug I/O Port access */
56#undef DEBUG_LBA_CFG /* debug Config Space Access (ie PCI Bus walk) */
57#undef DEBUG_LBA_PAT /* debug PCI Resource Mgt code - PDC PAT only */
58
59#undef FBB_SUPPORT /* Fast Back-Back xfers - NOT READY YET */
60
61
62#ifdef DEBUG_LBA
63#define DBG(x...) printk(x)
64#else
65#define DBG(x...)
66#endif
67
68#ifdef DEBUG_LBA_PORT
69#define DBG_PORT(x...) printk(x)
70#else
71#define DBG_PORT(x...)
72#endif
73
74#ifdef DEBUG_LBA_CFG
75#define DBG_CFG(x...) printk(x)
76#else
77#define DBG_CFG(x...)
78#endif
79
80#ifdef DEBUG_LBA_PAT
81#define DBG_PAT(x...) printk(x)
82#else
83#define DBG_PAT(x...)
84#endif
85
86
87/*
88** Config accessor functions only pass in the 8-bit bus number and not
89** the 8-bit "PCI Segment" number. Each LBA will be assigned a PCI bus
90** number based on what firmware wrote into the scratch register.
91**
92** The "secondary" bus number is set to this before calling
93** pci_register_ops(). If any PPB's are present, the scan will
94** discover them and update the "secondary" and "subordinate"
95** fields in the pci_bus structure.
96**
97** Changes in the configuration *may* result in a different
98** bus number for each LBA depending on what firmware does.
99*/
100
101#define MODULE_NAME "LBA"
102
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103/* non-postable I/O port space, densely packed */
104#define LBA_PORT_BASE (PCI_F_EXTEND | 0xfee00000UL)
Helge Deller8039de12006-01-10 20:35:03 -0500105static void __iomem *astro_iop_base __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107static u32 lba_t32;
108
109/* lba flags */
110#define LBA_FLAG_SKIP_PROBE 0x10
111
112#define LBA_SKIP_PROBE(d) ((d)->flags & LBA_FLAG_SKIP_PROBE)
113
114
115/* Looks nice and keeps the compiler happy */
116#define LBA_DEV(d) ((struct lba_device *) (d))
117
118
119/*
120** Only allow 8 subsidiary busses per LBA
121** Problem is the PCI bus numbering is globally shared.
122*/
123#define LBA_MAX_NUM_BUSES 8
124
125/************************************
126 * LBA register read and write support
127 *
128 * BE WARNED: register writes are posted.
129 * (ie follow writes which must reach HW with a read)
130 */
131#define READ_U8(addr) __raw_readb(addr)
132#define READ_U16(addr) __raw_readw(addr)
133#define READ_U32(addr) __raw_readl(addr)
134#define WRITE_U8(value, addr) __raw_writeb(value, addr)
135#define WRITE_U16(value, addr) __raw_writew(value, addr)
136#define WRITE_U32(value, addr) __raw_writel(value, addr)
137
138#define READ_REG8(addr) readb(addr)
139#define READ_REG16(addr) readw(addr)
140#define READ_REG32(addr) readl(addr)
141#define READ_REG64(addr) readq(addr)
142#define WRITE_REG8(value, addr) writeb(value, addr)
143#define WRITE_REG16(value, addr) writew(value, addr)
144#define WRITE_REG32(value, addr) writel(value, addr)
145
146
147#define LBA_CFG_TOK(bus,dfn) ((u32) ((bus)<<16 | (dfn)<<8))
148#define LBA_CFG_BUS(tok) ((u8) ((tok)>>16))
149#define LBA_CFG_DEV(tok) ((u8) ((tok)>>11) & 0x1f)
150#define LBA_CFG_FUNC(tok) ((u8) ((tok)>>8 ) & 0x7)
151
152
153/*
154** Extract LBA (Rope) number from HPA
155** REVISIT: 16 ropes for Stretch/Ike?
156*/
157#define ROPES_PER_IOC 8
158#define LBA_NUM(x) ((((unsigned long) x) >> 13) & (ROPES_PER_IOC-1))
159
160
161static void
162lba_dump_res(struct resource *r, int d)
163{
164 int i;
165
166 if (NULL == r)
167 return;
168
169 printk(KERN_DEBUG "(%p)", r->parent);
170 for (i = d; i ; --i) printk(" ");
Matthew Wilcox645d11d2006-12-24 19:28:42 -0700171 printk(KERN_DEBUG "%p [%lx,%lx]/%lx\n", r,
172 (long)r->start, (long)r->end, r->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 lba_dump_res(r->child, d+2);
174 lba_dump_res(r->sibling, d);
175}
176
177
178/*
179** LBA rev 2.0, 2.1, 2.2, and 3.0 bus walks require a complex
180** workaround for cfg cycles:
181** -- preserve LBA state
182** -- prevent any DMA from occurring
183** -- turn on smart mode
184** -- probe with config writes before doing config reads
185** -- check ERROR_STATUS
186** -- clear ERROR_STATUS
187** -- restore LBA state
188**
189** The workaround is only used for device discovery.
190*/
191
192static int lba_device_present(u8 bus, u8 dfn, struct lba_device *d)
193{
194 u8 first_bus = d->hba.hba_bus->secondary;
195 u8 last_sub_bus = d->hba.hba_bus->subordinate;
196
197 if ((bus < first_bus) ||
198 (bus > last_sub_bus) ||
199 ((bus - first_bus) >= LBA_MAX_NUM_BUSES)) {
200 return 0;
201 }
202
203 return 1;
204}
205
206
207
208#define LBA_CFG_SETUP(d, tok) { \
209 /* Save contents of error config register. */ \
210 error_config = READ_REG32(d->hba.base_addr + LBA_ERROR_CONFIG); \
211\
212 /* Save contents of status control register. */ \
213 status_control = READ_REG32(d->hba.base_addr + LBA_STAT_CTL); \
214\
215 /* For LBA rev 2.0, 2.1, 2.2, and 3.0, we must disable DMA \
216 ** arbitration for full bus walks. \
217 */ \
218 /* Save contents of arb mask register. */ \
219 arb_mask = READ_REG32(d->hba.base_addr + LBA_ARB_MASK); \
220\
221 /* \
222 * Turn off all device arbitration bits (i.e. everything \
223 * except arbitration enable bit). \
224 */ \
225 WRITE_REG32(0x1, d->hba.base_addr + LBA_ARB_MASK); \
226\
227 /* \
228 * Set the smart mode bit so that master aborts don't cause \
229 * LBA to go into PCI fatal mode (required). \
230 */ \
231 WRITE_REG32(error_config | LBA_SMART_MODE, d->hba.base_addr + LBA_ERROR_CONFIG); \
232}
233
234
235#define LBA_CFG_PROBE(d, tok) { \
236 /* \
237 * Setup Vendor ID write and read back the address register \
238 * to make sure that LBA is the bus master. \
239 */ \
240 WRITE_REG32(tok | PCI_VENDOR_ID, (d)->hba.base_addr + LBA_PCI_CFG_ADDR);\
241 /* \
242 * Read address register to ensure that LBA is the bus master, \
243 * which implies that DMA traffic has stopped when DMA arb is off. \
244 */ \
245 lba_t32 = READ_REG32((d)->hba.base_addr + LBA_PCI_CFG_ADDR); \
246 /* \
247 * Generate a cfg write cycle (will have no affect on \
248 * Vendor ID register since read-only). \
249 */ \
250 WRITE_REG32(~0, (d)->hba.base_addr + LBA_PCI_CFG_DATA); \
251 /* \
252 * Make sure write has completed before proceeding further, \
253 * i.e. before setting clear enable. \
254 */ \
255 lba_t32 = READ_REG32((d)->hba.base_addr + LBA_PCI_CFG_ADDR); \
256}
257
258
259/*
260 * HPREVISIT:
261 * -- Can't tell if config cycle got the error.
262 *
263 * OV bit is broken until rev 4.0, so can't use OV bit and
264 * LBA_ERROR_LOG_ADDR to tell if error belongs to config cycle.
265 *
266 * As of rev 4.0, no longer need the error check.
267 *
268 * -- Even if we could tell, we still want to return -1
269 * for **ANY** error (not just master abort).
270 *
271 * -- Only clear non-fatal errors (we don't want to bring
272 * LBA out of pci-fatal mode).
273 *
274 * Actually, there is still a race in which
275 * we could be clearing a fatal error. We will
276 * live with this during our initial bus walk
277 * until rev 4.0 (no driver activity during
278 * initial bus walk). The initial bus walk
279 * has race conditions concerning the use of
280 * smart mode as well.
281 */
282
283#define LBA_MASTER_ABORT_ERROR 0xc
284#define LBA_FATAL_ERROR 0x10
285
286#define LBA_CFG_MASTER_ABORT_CHECK(d, base, tok, error) { \
287 u32 error_status = 0; \
288 /* \
289 * Set clear enable (CE) bit. Unset by HW when new \
290 * errors are logged -- LBA HW ERS section 14.3.3). \
291 */ \
292 WRITE_REG32(status_control | CLEAR_ERRLOG_ENABLE, base + LBA_STAT_CTL); \
293 error_status = READ_REG32(base + LBA_ERROR_STATUS); \
294 if ((error_status & 0x1f) != 0) { \
295 /* \
296 * Fail the config read request. \
297 */ \
298 error = 1; \
299 if ((error_status & LBA_FATAL_ERROR) == 0) { \
300 /* \
301 * Clear error status (if fatal bit not set) by setting \
302 * clear error log bit (CL). \
303 */ \
304 WRITE_REG32(status_control | CLEAR_ERRLOG, base + LBA_STAT_CTL); \
305 } \
306 } \
307}
308
309#define LBA_CFG_TR4_ADDR_SETUP(d, addr) \
310 WRITE_REG32(((addr) & ~3), (d)->hba.base_addr + LBA_PCI_CFG_ADDR);
311
312#define LBA_CFG_ADDR_SETUP(d, addr) { \
313 WRITE_REG32(((addr) & ~3), (d)->hba.base_addr + LBA_PCI_CFG_ADDR); \
314 /* \
315 * Read address register to ensure that LBA is the bus master, \
316 * which implies that DMA traffic has stopped when DMA arb is off. \
317 */ \
318 lba_t32 = READ_REG32((d)->hba.base_addr + LBA_PCI_CFG_ADDR); \
319}
320
321
322#define LBA_CFG_RESTORE(d, base) { \
323 /* \
324 * Restore status control register (turn off clear enable). \
325 */ \
326 WRITE_REG32(status_control, base + LBA_STAT_CTL); \
327 /* \
328 * Restore error config register (turn off smart mode). \
329 */ \
330 WRITE_REG32(error_config, base + LBA_ERROR_CONFIG); \
331 /* \
332 * Restore arb mask register (reenables DMA arbitration). \
333 */ \
334 WRITE_REG32(arb_mask, base + LBA_ARB_MASK); \
335}
336
337
338
339static unsigned int
340lba_rd_cfg(struct lba_device *d, u32 tok, u8 reg, u32 size)
341{
342 u32 data = ~0U;
343 int error = 0;
344 u32 arb_mask = 0; /* used by LBA_CFG_SETUP/RESTORE */
345 u32 error_config = 0; /* used by LBA_CFG_SETUP/RESTORE */
346 u32 status_control = 0; /* used by LBA_CFG_SETUP/RESTORE */
347
348 LBA_CFG_SETUP(d, tok);
349 LBA_CFG_PROBE(d, tok);
350 LBA_CFG_MASTER_ABORT_CHECK(d, d->hba.base_addr, tok, error);
351 if (!error) {
352 void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;
353
354 LBA_CFG_ADDR_SETUP(d, tok | reg);
355 switch (size) {
356 case 1: data = (u32) READ_REG8(data_reg + (reg & 3)); break;
357 case 2: data = (u32) READ_REG16(data_reg+ (reg & 2)); break;
358 case 4: data = READ_REG32(data_reg); break;
359 }
360 }
361 LBA_CFG_RESTORE(d, d->hba.base_addr);
362 return(data);
363}
364
365
366static int elroy_cfg_read(struct pci_bus *bus, unsigned int devfn, int pos, int size, u32 *data)
367{
368 struct lba_device *d = LBA_DEV(parisc_walk_tree(bus->bridge));
369 u32 local_bus = (bus->parent == NULL) ? 0 : bus->secondary;
370 u32 tok = LBA_CFG_TOK(local_bus, devfn);
371 void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;
372
373 if ((pos > 255) || (devfn > 255))
374 return -EINVAL;
375
376/* FIXME: B2K/C3600 workaround is always use old method... */
377 /* if (!LBA_SKIP_PROBE(d)) */ {
378 /* original - Generate config cycle on broken elroy
379 with risk we will miss PCI bus errors. */
380 *data = lba_rd_cfg(d, tok, pos, size);
381 DBG_CFG("%s(%x+%2x) -> 0x%x (a)\n", __FUNCTION__, tok, pos, *data);
382 return 0;
383 }
384
385 if (LBA_SKIP_PROBE(d) && !lba_device_present(bus->secondary, devfn, d)) {
386 DBG_CFG("%s(%x+%2x) -> -1 (b)\n", __FUNCTION__, tok, pos);
387 /* either don't want to look or know device isn't present. */
388 *data = ~0U;
389 return(0);
390 }
391
392 /* Basic Algorithm
393 ** Should only get here on fully working LBA rev.
394 ** This is how simple the code should have been.
395 */
396 LBA_CFG_ADDR_SETUP(d, tok | pos);
397 switch(size) {
398 case 1: *data = READ_REG8 (data_reg + (pos & 3)); break;
399 case 2: *data = READ_REG16(data_reg + (pos & 2)); break;
400 case 4: *data = READ_REG32(data_reg); break;
401 }
402 DBG_CFG("%s(%x+%2x) -> 0x%x (c)\n", __FUNCTION__, tok, pos, *data);
403 return 0;
404}
405
406
407static void
408lba_wr_cfg(struct lba_device *d, u32 tok, u8 reg, u32 data, u32 size)
409{
410 int error = 0;
411 u32 arb_mask = 0;
412 u32 error_config = 0;
413 u32 status_control = 0;
414 void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;
415
416 LBA_CFG_SETUP(d, tok);
417 LBA_CFG_ADDR_SETUP(d, tok | reg);
418 switch (size) {
419 case 1: WRITE_REG8 (data, data_reg + (reg & 3)); break;
420 case 2: WRITE_REG16(data, data_reg + (reg & 2)); break;
421 case 4: WRITE_REG32(data, data_reg); break;
422 }
423 LBA_CFG_MASTER_ABORT_CHECK(d, d->hba.base_addr, tok, error);
424 LBA_CFG_RESTORE(d, d->hba.base_addr);
425}
426
427
428/*
429 * LBA 4.0 config write code implements non-postable semantics
430 * by doing a read of CONFIG ADDR after the write.
431 */
432
433static int elroy_cfg_write(struct pci_bus *bus, unsigned int devfn, int pos, int size, u32 data)
434{
435 struct lba_device *d = LBA_DEV(parisc_walk_tree(bus->bridge));
436 u32 local_bus = (bus->parent == NULL) ? 0 : bus->secondary;
437 u32 tok = LBA_CFG_TOK(local_bus,devfn);
438
439 if ((pos > 255) || (devfn > 255))
440 return -EINVAL;
441
442 if (!LBA_SKIP_PROBE(d)) {
443 /* Original Workaround */
444 lba_wr_cfg(d, tok, pos, (u32) data, size);
445 DBG_CFG("%s(%x+%2x) = 0x%x (a)\n", __FUNCTION__, tok, pos,data);
446 return 0;
447 }
448
449 if (LBA_SKIP_PROBE(d) && (!lba_device_present(bus->secondary, devfn, d))) {
450 DBG_CFG("%s(%x+%2x) = 0x%x (b)\n", __FUNCTION__, tok, pos,data);
451 return 1; /* New Workaround */
452 }
453
454 DBG_CFG("%s(%x+%2x) = 0x%x (c)\n", __FUNCTION__, tok, pos, data);
455
456 /* Basic Algorithm */
457 LBA_CFG_ADDR_SETUP(d, tok | pos);
458 switch(size) {
459 case 1: WRITE_REG8 (data, d->hba.base_addr + LBA_PCI_CFG_DATA + (pos & 3));
460 break;
461 case 2: WRITE_REG16(data, d->hba.base_addr + LBA_PCI_CFG_DATA + (pos & 2));
462 break;
463 case 4: WRITE_REG32(data, d->hba.base_addr + LBA_PCI_CFG_DATA);
464 break;
465 }
466 /* flush posted write */
467 lba_t32 = READ_REG32(d->hba.base_addr + LBA_PCI_CFG_ADDR);
468 return 0;
469}
470
471
472static struct pci_ops elroy_cfg_ops = {
473 .read = elroy_cfg_read,
474 .write = elroy_cfg_write,
475};
476
477/*
478 * The mercury_cfg_ops are slightly misnamed; they're also used for Elroy
479 * TR4.0 as no additional bugs were found in this areea between Elroy and
480 * Mercury
481 */
482
483static int mercury_cfg_read(struct pci_bus *bus, unsigned int devfn, int pos, int size, u32 *data)
484{
485 struct lba_device *d = LBA_DEV(parisc_walk_tree(bus->bridge));
486 u32 local_bus = (bus->parent == NULL) ? 0 : bus->secondary;
487 u32 tok = LBA_CFG_TOK(local_bus, devfn);
488 void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;
489
490 if ((pos > 255) || (devfn > 255))
491 return -EINVAL;
492
493 LBA_CFG_TR4_ADDR_SETUP(d, tok | pos);
494 switch(size) {
495 case 1:
496 *data = READ_REG8(data_reg + (pos & 3));
497 break;
498 case 2:
499 *data = READ_REG16(data_reg + (pos & 2));
500 break;
501 case 4:
502 *data = READ_REG32(data_reg); break;
503 break;
504 }
505
506 DBG_CFG("mercury_cfg_read(%x+%2x) -> 0x%x\n", tok, pos, *data);
507 return 0;
508}
509
510/*
511 * LBA 4.0 config write code implements non-postable semantics
512 * by doing a read of CONFIG ADDR after the write.
513 */
514
515static int mercury_cfg_write(struct pci_bus *bus, unsigned int devfn, int pos, int size, u32 data)
516{
517 struct lba_device *d = LBA_DEV(parisc_walk_tree(bus->bridge));
518 void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;
519 u32 local_bus = (bus->parent == NULL) ? 0 : bus->secondary;
520 u32 tok = LBA_CFG_TOK(local_bus,devfn);
521
522 if ((pos > 255) || (devfn > 255))
523 return -EINVAL;
524
525 DBG_CFG("%s(%x+%2x) <- 0x%x (c)\n", __FUNCTION__, tok, pos, data);
526
527 LBA_CFG_TR4_ADDR_SETUP(d, tok | pos);
528 switch(size) {
529 case 1:
530 WRITE_REG8 (data, data_reg + (pos & 3));
531 break;
532 case 2:
533 WRITE_REG16(data, data_reg + (pos & 2));
534 break;
535 case 4:
536 WRITE_REG32(data, data_reg);
537 break;
538 }
539
540 /* flush posted write */
541 lba_t32 = READ_U32(d->hba.base_addr + LBA_PCI_CFG_ADDR);
542 return 0;
543}
544
545static struct pci_ops mercury_cfg_ops = {
546 .read = mercury_cfg_read,
547 .write = mercury_cfg_write,
548};
549
550
551static void
552lba_bios_init(void)
553{
554 DBG(MODULE_NAME ": lba_bios_init\n");
555}
556
557
558#ifdef CONFIG_64BIT
559
560/*
561** Determine if a device is already configured.
562** If so, reserve it resources.
563**
564** Read PCI cfg command register and see if I/O or MMIO is enabled.
565** PAT has to enable the devices it's using.
566**
567** Note: resources are fixed up before we try to claim them.
568*/
569static void
570lba_claim_dev_resources(struct pci_dev *dev)
571{
572 u16 cmd;
573 int i, srch_flags;
574
575 (void) pci_read_config_word(dev, PCI_COMMAND, &cmd);
576
577 srch_flags = (cmd & PCI_COMMAND_IO) ? IORESOURCE_IO : 0;
578 if (cmd & PCI_COMMAND_MEMORY)
579 srch_flags |= IORESOURCE_MEM;
580
581 if (!srch_flags)
582 return;
583
584 for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
585 if (dev->resource[i].flags & srch_flags) {
586 pci_claim_resource(dev, i);
587 DBG(" claimed %s %d [%lx,%lx]/%lx\n",
588 pci_name(dev), i,
589 dev->resource[i].start,
590 dev->resource[i].end,
591 dev->resource[i].flags
592 );
593 }
594 }
595}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
597
598/*
Grant Grundler6ca45a22006-01-10 20:47:56 -0500599 * truncate_pat_collision: Deal with overlaps or outright collisions
600 * between PAT PDC reported ranges.
601 *
602 * Broken PA8800 firmware will report lmmio range that
603 * overlaps with CPU HPA. Just truncate the lmmio range.
604 *
605 * BEWARE: conflicts with this lmmio range may be an
606 * elmmio range which is pointing down another rope.
607 *
608 * FIXME: only deals with one collision per range...theoretically we
609 * could have several. Supporting more than one collision will get messy.
610 */
611static unsigned long
612truncate_pat_collision(struct resource *root, struct resource *new)
613{
614 unsigned long start = new->start;
615 unsigned long end = new->end;
616 struct resource *tmp = root->child;
617
618 if (end <= start || start < root->start || !tmp)
619 return 0;
620
621 /* find first overlap */
622 while (tmp && tmp->end < start)
623 tmp = tmp->sibling;
624
625 /* no entries overlap */
626 if (!tmp) return 0;
627
628 /* found one that starts behind the new one
629 ** Don't need to do anything.
630 */
631 if (tmp->start >= end) return 0;
632
633 if (tmp->start <= start) {
634 /* "front" of new one overlaps */
635 new->start = tmp->end + 1;
636
637 if (tmp->end >= end) {
638 /* AACCKK! totally overlaps! drop this range. */
639 return 1;
640 }
641 }
642
643 if (tmp->end < end ) {
644 /* "end" of new one overlaps */
645 new->end = tmp->start - 1;
646 }
647
648 printk(KERN_WARNING "LBA: Truncating lmmio_space [%lx/%lx] "
649 "to [%lx,%lx]\n",
650 start, end,
Matthew Wilcox645d11d2006-12-24 19:28:42 -0700651 (long)new->start, (long)new->end );
Grant Grundler6ca45a22006-01-10 20:47:56 -0500652
653 return 0; /* truncation successful */
654}
655
656#else
657#define lba_claim_dev_resources(dev) do { } while (0)
658#define truncate_pat_collision(r,n) (0)
659#endif
660
661/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662** The algorithm is generic code.
663** But it needs to access local data structures to get the IRQ base.
664** Could make this a "pci_fixup_irq(bus, region)" but not sure
665** it's worth it.
666**
667** Called by do_pci_scan_bus() immediately after each PCI bus is walked.
668** Resources aren't allocated until recursive buswalk below HBA is completed.
669*/
670static void
671lba_fixup_bus(struct pci_bus *bus)
672{
673 struct list_head *ln;
674#ifdef FBB_SUPPORT
675 u16 status;
676#endif
677 struct lba_device *ldev = LBA_DEV(parisc_walk_tree(bus->bridge));
678 int lba_portbase = HBA_PORT_BASE(ldev->hba.hba_num);
679
680 DBG("lba_fixup_bus(0x%p) bus %d platform_data 0x%p\n",
681 bus, bus->secondary, bus->bridge->platform_data);
682
683 /*
684 ** Properly Setup MMIO resources for this bus.
685 ** pci_alloc_primary_bus() mangles this.
686 */
687 if (bus->self) {
688 /* PCI-PCI Bridge */
689 pci_read_bridge_bases(bus);
690 } else {
691 /* Host-PCI Bridge */
692 int err, i;
693
694 DBG("lba_fixup_bus() %s [%lx/%lx]/%lx\n",
695 ldev->hba.io_space.name,
696 ldev->hba.io_space.start, ldev->hba.io_space.end,
697 ldev->hba.io_space.flags);
698 DBG("lba_fixup_bus() %s [%lx/%lx]/%lx\n",
699 ldev->hba.lmmio_space.name,
700 ldev->hba.lmmio_space.start, ldev->hba.lmmio_space.end,
701 ldev->hba.lmmio_space.flags);
702
703 err = request_resource(&ioport_resource, &(ldev->hba.io_space));
704 if (err < 0) {
705 lba_dump_res(&ioport_resource, 2);
706 BUG();
707 }
Grant Grundler6ca45a22006-01-10 20:47:56 -0500708 /* advertize Host bridge resources to PCI bus */
709 bus->resource[0] = &(ldev->hba.io_space);
710 i = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
712 if (ldev->hba.elmmio_space.start) {
713 err = request_resource(&iomem_resource,
714 &(ldev->hba.elmmio_space));
715 if (err < 0) {
716
717 printk("FAILED: lba_fixup_bus() request for "
718 "elmmio_space [%lx/%lx]\n",
Matthew Wilcox645d11d2006-12-24 19:28:42 -0700719 (long)ldev->hba.elmmio_space.start,
720 (long)ldev->hba.elmmio_space.end);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721
722 /* lba_dump_res(&iomem_resource, 2); */
723 /* BUG(); */
Grant Grundler6ca45a22006-01-10 20:47:56 -0500724 } else
725 bus->resource[i++] = &(ldev->hba.elmmio_space);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 }
727
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
Grant Grundler6ca45a22006-01-10 20:47:56 -0500729 /* Overlaps with elmmio can (and should) fail here.
730 * We will prune (or ignore) the distributed range.
731 *
732 * FIXME: SBA code should register all elmmio ranges first.
733 * that would take care of elmmio ranges routed
734 * to a different rope (already discovered) from
735 * getting registered *after* LBA code has already
736 * registered it's distributed lmmio range.
737 */
738 if (truncate_pat_collision(&iomem_resource,
739 &(ldev->hba.lmmio_space))) {
740
741 printk(KERN_WARNING "LBA: lmmio_space [%lx/%lx] duplicate!\n",
Matthew Wilcox645d11d2006-12-24 19:28:42 -0700742 (long)ldev->hba.lmmio_space.start,
743 (long)ldev->hba.lmmio_space.end);
Grant Grundler6ca45a22006-01-10 20:47:56 -0500744 } else {
745 err = request_resource(&iomem_resource, &(ldev->hba.lmmio_space));
746 if (err < 0) {
747 printk(KERN_ERR "FAILED: lba_fixup_bus() request for "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 "lmmio_space [%lx/%lx]\n",
Matthew Wilcox645d11d2006-12-24 19:28:42 -0700749 (long)ldev->hba.lmmio_space.start,
750 (long)ldev->hba.lmmio_space.end);
Grant Grundler6ca45a22006-01-10 20:47:56 -0500751 } else
752 bus->resource[i++] = &(ldev->hba.lmmio_space);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 }
754
755#ifdef CONFIG_64BIT
756 /* GMMIO is distributed range. Every LBA/Rope gets part it. */
757 if (ldev->hba.gmmio_space.flags) {
758 err = request_resource(&iomem_resource, &(ldev->hba.gmmio_space));
759 if (err < 0) {
760 printk("FAILED: lba_fixup_bus() request for "
761 "gmmio_space [%lx/%lx]\n",
Matthew Wilcox645d11d2006-12-24 19:28:42 -0700762 (long)ldev->hba.gmmio_space.start,
763 (long)ldev->hba.gmmio_space.end);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 lba_dump_res(&iomem_resource, 2);
765 BUG();
766 }
Grant Grundler6ca45a22006-01-10 20:47:56 -0500767 bus->resource[i++] = &(ldev->hba.gmmio_space);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 }
769#endif
770
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 }
772
773 list_for_each(ln, &bus->devices) {
774 int i;
775 struct pci_dev *dev = pci_dev_b(ln);
776
777 DBG("lba_fixup_bus() %s\n", pci_name(dev));
778
779 /* Virtualize Device/Bridge Resources. */
780 for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) {
781 struct resource *res = &dev->resource[i];
782
783 /* If resource not allocated - skip it */
784 if (!res->start)
785 continue;
786
787 if (res->flags & IORESOURCE_IO) {
788 DBG("lba_fixup_bus() I/O Ports [%lx/%lx] -> ",
789 res->start, res->end);
790 res->start |= lba_portbase;
791 res->end |= lba_portbase;
792 DBG("[%lx/%lx]\n", res->start, res->end);
793 } else if (res->flags & IORESOURCE_MEM) {
794 /*
795 ** Convert PCI (IO_VIEW) addresses to
796 ** processor (PA_VIEW) addresses
797 */
798 DBG("lba_fixup_bus() MMIO [%lx/%lx] -> ",
799 res->start, res->end);
800 res->start = PCI_HOST_ADDR(HBA_DATA(ldev), res->start);
801 res->end = PCI_HOST_ADDR(HBA_DATA(ldev), res->end);
802 DBG("[%lx/%lx]\n", res->start, res->end);
803 } else {
804 DBG("lba_fixup_bus() WTF? 0x%lx [%lx/%lx] XXX",
805 res->flags, res->start, res->end);
806 }
807 }
808
809#ifdef FBB_SUPPORT
810 /*
811 ** If one device does not support FBB transfers,
812 ** No one on the bus can be allowed to use them.
813 */
814 (void) pci_read_config_word(dev, PCI_STATUS, &status);
815 bus->bridge_ctl &= ~(status & PCI_STATUS_FAST_BACK);
816#endif
817
818 if (is_pdc_pat()) {
819 /* Claim resources for PDC's devices */
820 lba_claim_dev_resources(dev);
821 }
822
823 /*
824 ** P2PB's have no IRQs. ignore them.
825 */
826 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)
827 continue;
828
829 /* Adjust INTERRUPT_LINE for this dev */
830 iosapic_fixup_irq(ldev->iosapic_obj, dev);
831 }
832
833#ifdef FBB_SUPPORT
834/* FIXME/REVISIT - finish figuring out to set FBB on both
835** pci_setup_bridge() clobbers PCI_BRIDGE_CONTROL.
836** Can't fixup here anyway....garr...
837*/
838 if (fbb_enable) {
839 if (bus->self) {
840 u8 control;
841 /* enable on PPB */
842 (void) pci_read_config_byte(bus->self, PCI_BRIDGE_CONTROL, &control);
843 (void) pci_write_config_byte(bus->self, PCI_BRIDGE_CONTROL, control | PCI_STATUS_FAST_BACK);
844
845 } else {
846 /* enable on LBA */
847 }
848 fbb_enable = PCI_COMMAND_FAST_BACK;
849 }
850
851 /* Lastly enable FBB/PERR/SERR on all devices too */
852 list_for_each(ln, &bus->devices) {
853 (void) pci_read_config_word(dev, PCI_COMMAND, &status);
854 status |= PCI_COMMAND_PARITY | PCI_COMMAND_SERR | fbb_enable;
855 (void) pci_write_config_word(dev, PCI_COMMAND, status);
856 }
857#endif
858}
859
860
861struct pci_bios_ops lba_bios_ops = {
862 .init = lba_bios_init,
863 .fixup_bus = lba_fixup_bus,
864};
865
866
867
868
869/*******************************************************
870**
871** LBA Sprockets "I/O Port" Space Accessor Functions
872**
873** This set of accessor functions is intended for use with
874** "legacy firmware" (ie Sprockets on Allegro/Forte boxes).
875**
876** Many PCI devices don't require use of I/O port space (eg Tulip,
877** NCR720) since they export the same registers to both MMIO and
878** I/O port space. In general I/O port space is slower than
879** MMIO since drivers are designed so PIO writes can be posted.
880**
881********************************************************/
882
883#define LBA_PORT_IN(size, mask) \
884static u##size lba_astro_in##size (struct pci_hba_data *d, u16 addr) \
885{ \
886 u##size t; \
887 t = READ_REG##size(astro_iop_base + addr); \
888 DBG_PORT(" 0x%x\n", t); \
889 return (t); \
890}
891
892LBA_PORT_IN( 8, 3)
893LBA_PORT_IN(16, 2)
894LBA_PORT_IN(32, 0)
895
896
897
898/*
899** BUG X4107: Ordering broken - DMA RD return can bypass PIO WR
900**
901** Fixed in Elroy 2.2. The READ_U32(..., LBA_FUNC_ID) below is
902** guarantee non-postable completion semantics - not avoid X4107.
903** The READ_U32 only guarantees the write data gets to elroy but
904** out to the PCI bus. We can't read stuff from I/O port space
905** since we don't know what has side-effects. Attempting to read
906** from configuration space would be suicidal given the number of
907** bugs in that elroy functionality.
908**
909** Description:
910** DMA read results can improperly pass PIO writes (X4107). The
911** result of this bug is that if a processor modifies a location in
912** memory after having issued PIO writes, the PIO writes are not
913** guaranteed to be completed before a PCI device is allowed to see
914** the modified data in a DMA read.
915**
916** Note that IKE bug X3719 in TR1 IKEs will result in the same
917** symptom.
918**
919** Workaround:
920** The workaround for this bug is to always follow a PIO write with
921** a PIO read to the same bus before starting DMA on that PCI bus.
922**
923*/
924#define LBA_PORT_OUT(size, mask) \
925static void lba_astro_out##size (struct pci_hba_data *d, u16 addr, u##size val) \
926{ \
927 DBG_PORT("%s(0x%p, 0x%x, 0x%x)\n", __FUNCTION__, d, addr, val); \
928 WRITE_REG##size(val, astro_iop_base + addr); \
929 if (LBA_DEV(d)->hw_rev < 3) \
930 lba_t32 = READ_U32(d->base_addr + LBA_FUNC_ID); \
931}
932
933LBA_PORT_OUT( 8, 3)
934LBA_PORT_OUT(16, 2)
935LBA_PORT_OUT(32, 0)
936
937
938static struct pci_port_ops lba_astro_port_ops = {
939 .inb = lba_astro_in8,
940 .inw = lba_astro_in16,
941 .inl = lba_astro_in32,
942 .outb = lba_astro_out8,
943 .outw = lba_astro_out16,
944 .outl = lba_astro_out32
945};
946
947
948#ifdef CONFIG_64BIT
949#define PIOP_TO_GMMIO(lba, addr) \
950 ((lba)->iop_base + (((addr)&0xFFFC)<<10) + ((addr)&3))
951
952/*******************************************************
953**
954** LBA PAT "I/O Port" Space Accessor Functions
955**
956** This set of accessor functions is intended for use with
957** "PAT PDC" firmware (ie Prelude/Rhapsody/Piranha boxes).
958**
959** This uses the PIOP space located in the first 64MB of GMMIO.
960** Each rope gets a full 64*KB* (ie 4 bytes per page) this way.
961** bits 1:0 stay the same. bits 15:2 become 25:12.
962** Then add the base and we can generate an I/O Port cycle.
963********************************************************/
964#undef LBA_PORT_IN
965#define LBA_PORT_IN(size, mask) \
966static u##size lba_pat_in##size (struct pci_hba_data *l, u16 addr) \
967{ \
968 u##size t; \
969 DBG_PORT("%s(0x%p, 0x%x) ->", __FUNCTION__, l, addr); \
970 t = READ_REG##size(PIOP_TO_GMMIO(LBA_DEV(l), addr)); \
971 DBG_PORT(" 0x%x\n", t); \
972 return (t); \
973}
974
975LBA_PORT_IN( 8, 3)
976LBA_PORT_IN(16, 2)
977LBA_PORT_IN(32, 0)
978
979
980#undef LBA_PORT_OUT
981#define LBA_PORT_OUT(size, mask) \
982static void lba_pat_out##size (struct pci_hba_data *l, u16 addr, u##size val) \
983{ \
Matthew Wilcoxc2c47982006-10-26 10:06:07 -0600984 void __iomem *where = PIOP_TO_GMMIO(LBA_DEV(l), addr); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985 DBG_PORT("%s(0x%p, 0x%x, 0x%x)\n", __FUNCTION__, l, addr, val); \
986 WRITE_REG##size(val, where); \
987 /* flush the I/O down to the elroy at least */ \
988 lba_t32 = READ_U32(l->base_addr + LBA_FUNC_ID); \
989}
990
991LBA_PORT_OUT( 8, 3)
992LBA_PORT_OUT(16, 2)
993LBA_PORT_OUT(32, 0)
994
995
996static struct pci_port_ops lba_pat_port_ops = {
997 .inb = lba_pat_in8,
998 .inw = lba_pat_in16,
999 .inl = lba_pat_in32,
1000 .outb = lba_pat_out8,
1001 .outw = lba_pat_out16,
1002 .outl = lba_pat_out32
1003};
1004
1005
1006
1007/*
1008** make range information from PDC available to PCI subsystem.
1009** We make the PDC call here in order to get the PCI bus range
1010** numbers. The rest will get forwarded in pcibios_fixup_bus().
1011** We don't have a struct pci_bus assigned to us yet.
1012*/
1013static void
1014lba_pat_resources(struct parisc_device *pa_dev, struct lba_device *lba_dev)
1015{
1016 unsigned long bytecnt;
1017 pdc_pat_cell_mod_maddr_block_t pa_pdc_cell; /* PA_VIEW */
1018 pdc_pat_cell_mod_maddr_block_t io_pdc_cell; /* IO_VIEW */
1019 long io_count;
1020 long status; /* PDC return status */
1021 long pa_count;
1022 int i;
1023
1024 /* return cell module (IO view) */
1025 status = pdc_pat_cell_module(&bytecnt, pa_dev->pcell_loc, pa_dev->mod_index,
1026 PA_VIEW, & pa_pdc_cell);
1027 pa_count = pa_pdc_cell.mod[1];
1028
1029 status |= pdc_pat_cell_module(&bytecnt, pa_dev->pcell_loc, pa_dev->mod_index,
1030 IO_VIEW, &io_pdc_cell);
1031 io_count = io_pdc_cell.mod[1];
1032
1033 /* We've already done this once for device discovery...*/
1034 if (status != PDC_OK) {
1035 panic("pdc_pat_cell_module() call failed for LBA!\n");
1036 }
1037
1038 if (PAT_GET_ENTITY(pa_pdc_cell.mod_info) != PAT_ENTITY_LBA) {
1039 panic("pdc_pat_cell_module() entity returned != PAT_ENTITY_LBA!\n");
1040 }
1041
1042 /*
1043 ** Inspect the resources PAT tells us about
1044 */
1045 for (i = 0; i < pa_count; i++) {
1046 struct {
1047 unsigned long type;
1048 unsigned long start;
1049 unsigned long end; /* aka finish */
1050 } *p, *io;
1051 struct resource *r;
1052
1053 p = (void *) &(pa_pdc_cell.mod[2+i*3]);
1054 io = (void *) &(io_pdc_cell.mod[2+i*3]);
1055
1056 /* Convert the PAT range data to PCI "struct resource" */
1057 switch(p->type & 0xff) {
1058 case PAT_PBNUM:
1059 lba_dev->hba.bus_num.start = p->start;
1060 lba_dev->hba.bus_num.end = p->end;
1061 break;
1062
1063 case PAT_LMMIO:
1064 /* used to fix up pre-initialized MEM BARs */
1065 if (!lba_dev->hba.lmmio_space.start) {
1066 sprintf(lba_dev->hba.lmmio_name,
Matthew Wilcox645d11d2006-12-24 19:28:42 -07001067 "PCI%02x LMMIO",
1068 (int)lba_dev->hba.bus_num.start);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 lba_dev->hba.lmmio_space_offset = p->start -
1070 io->start;
1071 r = &lba_dev->hba.lmmio_space;
1072 r->name = lba_dev->hba.lmmio_name;
1073 } else if (!lba_dev->hba.elmmio_space.start) {
1074 sprintf(lba_dev->hba.elmmio_name,
Matthew Wilcox645d11d2006-12-24 19:28:42 -07001075 "PCI%02x ELMMIO",
1076 (int)lba_dev->hba.bus_num.start);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 r = &lba_dev->hba.elmmio_space;
1078 r->name = lba_dev->hba.elmmio_name;
1079 } else {
1080 printk(KERN_WARNING MODULE_NAME
1081 " only supports 2 LMMIO resources!\n");
1082 break;
1083 }
1084
1085 r->start = p->start;
1086 r->end = p->end;
1087 r->flags = IORESOURCE_MEM;
1088 r->parent = r->sibling = r->child = NULL;
1089 break;
1090
1091 case PAT_GMMIO:
1092 /* MMIO space > 4GB phys addr; for 64-bit BAR */
Matthew Wilcox645d11d2006-12-24 19:28:42 -07001093 sprintf(lba_dev->hba.gmmio_name, "PCI%02x GMMIO",
1094 (int)lba_dev->hba.bus_num.start);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 r = &lba_dev->hba.gmmio_space;
1096 r->name = lba_dev->hba.gmmio_name;
1097 r->start = p->start;
1098 r->end = p->end;
1099 r->flags = IORESOURCE_MEM;
1100 r->parent = r->sibling = r->child = NULL;
1101 break;
1102
1103 case PAT_NPIOP:
1104 printk(KERN_WARNING MODULE_NAME
1105 " range[%d] : ignoring NPIOP (0x%lx)\n",
1106 i, p->start);
1107 break;
1108
1109 case PAT_PIOP:
1110 /*
1111 ** Postable I/O port space is per PCI host adapter.
1112 ** base of 64MB PIOP region
1113 */
Helge Deller5076c152006-03-27 12:52:15 -07001114 lba_dev->iop_base = ioremap_nocache(p->start, 64 * 1024 * 1024);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115
Matthew Wilcox645d11d2006-12-24 19:28:42 -07001116 sprintf(lba_dev->hba.io_name, "PCI%02x Ports",
1117 (int)lba_dev->hba.bus_num.start);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118 r = &lba_dev->hba.io_space;
1119 r->name = lba_dev->hba.io_name;
1120 r->start = HBA_PORT_BASE(lba_dev->hba.hba_num);
1121 r->end = r->start + HBA_PORT_SPACE_SIZE - 1;
1122 r->flags = IORESOURCE_IO;
1123 r->parent = r->sibling = r->child = NULL;
1124 break;
1125
1126 default:
1127 printk(KERN_WARNING MODULE_NAME
1128 " range[%d] : unknown pat range type (0x%lx)\n",
1129 i, p->type & 0xff);
1130 break;
1131 }
1132 }
1133}
1134#else
1135/* keep compiler from complaining about missing declarations */
1136#define lba_pat_port_ops lba_astro_port_ops
1137#define lba_pat_resources(pa_dev, lba_dev)
1138#endif /* CONFIG_64BIT */
1139
1140
1141extern void sba_distributed_lmmio(struct parisc_device *, struct resource *);
1142extern void sba_directed_lmmio(struct parisc_device *, struct resource *);
1143
1144
1145static void
1146lba_legacy_resources(struct parisc_device *pa_dev, struct lba_device *lba_dev)
1147{
1148 struct resource *r;
1149 int lba_num;
1150
1151 lba_dev->hba.lmmio_space_offset = PCI_F_EXTEND;
1152
1153 /*
1154 ** With "legacy" firmware, the lowest byte of FW_SCRATCH
1155 ** represents bus->secondary and the second byte represents
1156 ** bus->subsidiary (i.e. highest PPB programmed by firmware).
1157 ** PCI bus walk *should* end up with the same result.
1158 ** FIXME: But we don't have sanity checks in PCI or LBA.
1159 */
1160 lba_num = READ_REG32(lba_dev->hba.base_addr + LBA_FW_SCRATCH);
1161 r = &(lba_dev->hba.bus_num);
1162 r->name = "LBA PCI Busses";
1163 r->start = lba_num & 0xff;
1164 r->end = (lba_num>>8) & 0xff;
1165
1166 /* Set up local PCI Bus resources - we don't need them for
1167 ** Legacy boxes but it's nice to see in /proc/iomem.
1168 */
1169 r = &(lba_dev->hba.lmmio_space);
Matthew Wilcox645d11d2006-12-24 19:28:42 -07001170 sprintf(lba_dev->hba.lmmio_name, "PCI%02x LMMIO",
1171 (int)lba_dev->hba.bus_num.start);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 r->name = lba_dev->hba.lmmio_name;
1173
1174#if 1
1175 /* We want the CPU -> IO routing of addresses.
1176 * The SBA BASE/MASK registers control CPU -> IO routing.
1177 * Ask SBA what is routed to this rope/LBA.
1178 */
1179 sba_distributed_lmmio(pa_dev, r);
1180#else
1181 /*
1182 * The LBA BASE/MASK registers control IO -> System routing.
1183 *
1184 * The following code works but doesn't get us what we want.
1185 * Well, only because firmware (v5.0) on C3000 doesn't program
1186 * the LBA BASE/MASE registers to be the exact inverse of
1187 * the corresponding SBA registers. Other Astro/Pluto
1188 * based platform firmware may do it right.
1189 *
1190 * Should someone want to mess with MSI, they may need to
1191 * reprogram LBA BASE/MASK registers. Thus preserve the code
1192 * below until MSI is known to work on C3000/A500/N4000/RP3440.
1193 *
1194 * Using the code below, /proc/iomem shows:
1195 * ...
1196 * f0000000-f0ffffff : PCI00 LMMIO
1197 * f05d0000-f05d0000 : lcd_data
1198 * f05d0008-f05d0008 : lcd_cmd
1199 * f1000000-f1ffffff : PCI01 LMMIO
1200 * f4000000-f4ffffff : PCI02 LMMIO
1201 * f4000000-f4001fff : sym53c8xx
1202 * f4002000-f4003fff : sym53c8xx
1203 * f4004000-f40043ff : sym53c8xx
1204 * f4005000-f40053ff : sym53c8xx
1205 * f4007000-f4007fff : ohci_hcd
1206 * f4008000-f40083ff : tulip
1207 * f6000000-f6ffffff : PCI03 LMMIO
1208 * f8000000-fbffffff : PCI00 ELMMIO
1209 * fa100000-fa4fffff : stifb mmio
1210 * fb000000-fb1fffff : stifb fb
1211 *
1212 * But everything listed under PCI02 actually lives under PCI00.
1213 * This is clearly wrong.
1214 *
1215 * Asking SBA how things are routed tells the correct story:
1216 * LMMIO_BASE/MASK/ROUTE f4000001 fc000000 00000000
1217 * DIR0_BASE/MASK/ROUTE fa000001 fe000000 00000006
1218 * DIR1_BASE/MASK/ROUTE f9000001 ff000000 00000004
1219 * DIR2_BASE/MASK/ROUTE f0000000 fc000000 00000000
1220 * DIR3_BASE/MASK/ROUTE f0000000 fc000000 00000000
1221 *
1222 * Which looks like this in /proc/iomem:
1223 * f4000000-f47fffff : PCI00 LMMIO
1224 * f4000000-f4001fff : sym53c8xx
1225 * ...[deteled core devices - same as above]...
1226 * f4008000-f40083ff : tulip
1227 * f4800000-f4ffffff : PCI01 LMMIO
1228 * f6000000-f67fffff : PCI02 LMMIO
1229 * f7000000-f77fffff : PCI03 LMMIO
1230 * f9000000-f9ffffff : PCI02 ELMMIO
1231 * fa000000-fbffffff : PCI03 ELMMIO
1232 * fa100000-fa4fffff : stifb mmio
1233 * fb000000-fb1fffff : stifb fb
1234 *
1235 * ie all Built-in core are under now correctly under PCI00.
1236 * The "PCI02 ELMMIO" directed range is for:
1237 * +-[02]---03.0 3Dfx Interactive, Inc. Voodoo 2
1238 *
1239 * All is well now.
1240 */
1241 r->start = READ_REG32(lba_dev->hba.base_addr + LBA_LMMIO_BASE);
1242 if (r->start & 1) {
1243 unsigned long rsize;
1244
1245 r->flags = IORESOURCE_MEM;
1246 /* mmio_mask also clears Enable bit */
1247 r->start &= mmio_mask;
1248 r->start = PCI_HOST_ADDR(HBA_DATA(lba_dev), r->start);
1249 rsize = ~ READ_REG32(lba_dev->hba.base_addr + LBA_LMMIO_MASK);
1250
1251 /*
1252 ** Each rope only gets part of the distributed range.
1253 ** Adjust "window" for this rope.
1254 */
1255 rsize /= ROPES_PER_IOC;
Matthew Wilcox53f01bb2005-10-21 22:36:40 -04001256 r->start += (rsize + 1) * LBA_NUM(pa_dev->hpa.start);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257 r->end = r->start + rsize;
1258 } else {
1259 r->end = r->start = 0; /* Not enabled. */
1260 }
1261#endif
1262
1263 /*
1264 ** "Directed" ranges are used when the "distributed range" isn't
1265 ** sufficient for all devices below a given LBA. Typically devices
1266 ** like graphics cards or X25 may need a directed range when the
1267 ** bus has multiple slots (ie multiple devices) or the device
1268 ** needs more than the typical 4 or 8MB a distributed range offers.
1269 **
1270 ** The main reason for ignoring it now frigging complications.
1271 ** Directed ranges may overlap (and have precedence) over
1272 ** distributed ranges. Or a distributed range assigned to a unused
1273 ** rope may be used by a directed range on a different rope.
1274 ** Support for graphics devices may require fixing this
1275 ** since they may be assigned a directed range which overlaps
1276 ** an existing (but unused portion of) distributed range.
1277 */
1278 r = &(lba_dev->hba.elmmio_space);
Matthew Wilcox645d11d2006-12-24 19:28:42 -07001279 sprintf(lba_dev->hba.elmmio_name, "PCI%02x ELMMIO",
1280 (int)lba_dev->hba.bus_num.start);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 r->name = lba_dev->hba.elmmio_name;
1282
1283#if 1
1284 /* See comment which precedes call to sba_directed_lmmio() */
1285 sba_directed_lmmio(pa_dev, r);
1286#else
1287 r->start = READ_REG32(lba_dev->hba.base_addr + LBA_ELMMIO_BASE);
1288
1289 if (r->start & 1) {
1290 unsigned long rsize;
1291 r->flags = IORESOURCE_MEM;
1292 /* mmio_mask also clears Enable bit */
1293 r->start &= mmio_mask;
1294 r->start = PCI_HOST_ADDR(HBA_DATA(lba_dev), r->start);
1295 rsize = READ_REG32(lba_dev->hba.base_addr + LBA_ELMMIO_MASK);
1296 r->end = r->start + ~rsize;
1297 }
1298#endif
1299
1300 r = &(lba_dev->hba.io_space);
Matthew Wilcox645d11d2006-12-24 19:28:42 -07001301 sprintf(lba_dev->hba.io_name, "PCI%02x Ports",
1302 (int)lba_dev->hba.bus_num.start);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 r->name = lba_dev->hba.io_name;
1304 r->flags = IORESOURCE_IO;
1305 r->start = READ_REG32(lba_dev->hba.base_addr + LBA_IOS_BASE) & ~1L;
1306 r->end = r->start + (READ_REG32(lba_dev->hba.base_addr + LBA_IOS_MASK) ^ (HBA_PORT_SPACE_SIZE - 1));
1307
1308 /* Virtualize the I/O Port space ranges */
1309 lba_num = HBA_PORT_BASE(lba_dev->hba.hba_num);
1310 r->start |= lba_num;
1311 r->end |= lba_num;
1312}
1313
1314
1315/**************************************************************************
1316**
1317** LBA initialization code (HW and SW)
1318**
1319** o identify LBA chip itself
1320** o initialize LBA chip modes (HardFail)
1321** o FIXME: initialize DMA hints for reasonable defaults
1322** o enable configuration functions
1323** o call pci_register_ops() to discover devs (fixup/fixup_bus get invoked)
1324**
1325**************************************************************************/
1326
1327static int __init
1328lba_hw_init(struct lba_device *d)
1329{
1330 u32 stat;
1331 u32 bus_reset; /* PDC_PAT_BUG */
1332
1333#if 0
1334 printk(KERN_DEBUG "LBA %lx STAT_CTL %Lx ERROR_CFG %Lx STATUS %Lx DMA_CTL %Lx\n",
1335 d->hba.base_addr,
1336 READ_REG64(d->hba.base_addr + LBA_STAT_CTL),
1337 READ_REG64(d->hba.base_addr + LBA_ERROR_CONFIG),
1338 READ_REG64(d->hba.base_addr + LBA_ERROR_STATUS),
1339 READ_REG64(d->hba.base_addr + LBA_DMA_CTL) );
1340 printk(KERN_DEBUG " ARB mask %Lx pri %Lx mode %Lx mtlt %Lx\n",
1341 READ_REG64(d->hba.base_addr + LBA_ARB_MASK),
1342 READ_REG64(d->hba.base_addr + LBA_ARB_PRI),
1343 READ_REG64(d->hba.base_addr + LBA_ARB_MODE),
1344 READ_REG64(d->hba.base_addr + LBA_ARB_MTLT) );
1345 printk(KERN_DEBUG " HINT cfg 0x%Lx\n",
1346 READ_REG64(d->hba.base_addr + LBA_HINT_CFG));
1347 printk(KERN_DEBUG " HINT reg ");
1348 { int i;
1349 for (i=LBA_HINT_BASE; i< (14*8 + LBA_HINT_BASE); i+=8)
1350 printk(" %Lx", READ_REG64(d->hba.base_addr + i));
1351 }
1352 printk("\n");
1353#endif /* DEBUG_LBA_PAT */
1354
1355#ifdef CONFIG_64BIT
1356/*
1357 * FIXME add support for PDC_PAT_IO "Get slot status" - OLAR support
1358 * Only N-Class and up can really make use of Get slot status.
1359 * maybe L-class too but I've never played with it there.
1360 */
1361#endif
1362
1363 /* PDC_PAT_BUG: exhibited in rev 40.48 on L2000 */
1364 bus_reset = READ_REG32(d->hba.base_addr + LBA_STAT_CTL + 4) & 1;
1365 if (bus_reset) {
1366 printk(KERN_DEBUG "NOTICE: PCI bus reset still asserted! (clearing)\n");
1367 }
1368
1369 stat = READ_REG32(d->hba.base_addr + LBA_ERROR_CONFIG);
1370 if (stat & LBA_SMART_MODE) {
1371 printk(KERN_DEBUG "NOTICE: LBA in SMART mode! (cleared)\n");
1372 stat &= ~LBA_SMART_MODE;
1373 WRITE_REG32(stat, d->hba.base_addr + LBA_ERROR_CONFIG);
1374 }
1375
1376 /* Set HF mode as the default (vs. -1 mode). */
1377 stat = READ_REG32(d->hba.base_addr + LBA_STAT_CTL);
1378 WRITE_REG32(stat | HF_ENABLE, d->hba.base_addr + LBA_STAT_CTL);
1379
1380 /*
1381 ** Writing a zero to STAT_CTL.rf (bit 0) will clear reset signal
1382 ** if it's not already set. If we just cleared the PCI Bus Reset
1383 ** signal, wait a bit for the PCI devices to recover and setup.
1384 */
1385 if (bus_reset)
1386 mdelay(pci_post_reset_delay);
1387
1388 if (0 == READ_REG32(d->hba.base_addr + LBA_ARB_MASK)) {
1389 /*
1390 ** PDC_PAT_BUG: PDC rev 40.48 on L2000.
1391 ** B2000/C3600/J6000 also have this problem?
1392 **
1393 ** Elroys with hot pluggable slots don't get configured
1394 ** correctly if the slot is empty. ARB_MASK is set to 0
1395 ** and we can't master transactions on the bus if it's
1396 ** not at least one. 0x3 enables elroy and first slot.
1397 */
1398 printk(KERN_DEBUG "NOTICE: Enabling PCI Arbitration\n");
1399 WRITE_REG32(0x3, d->hba.base_addr + LBA_ARB_MASK);
1400 }
1401
1402 /*
1403 ** FIXME: Hint registers are programmed with default hint
1404 ** values by firmware. Hints should be sane even if we
1405 ** can't reprogram them the way drivers want.
1406 */
1407 return 0;
1408}
1409
Matthew Wilcox353dfe12006-11-18 10:11:03 -07001410/*
1411 * Unfortunately, when firmware numbers busses, it doesn't take into account
1412 * Cardbus bridges. So we have to renumber the busses to suit ourselves.
1413 * Elroy/Mercury don't actually know what bus number they're attached to;
1414 * we use bus 0 to indicate the directly attached bus and any other bus
1415 * number will be taken care of by the PCI-PCI bridge.
1416 */
1417static unsigned int lba_next_bus = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418
1419/*
Matthew Wilcox353dfe12006-11-18 10:11:03 -07001420 * Determine if lba should claim this chip (return 0) or not (return 1).
1421 * If so, initialize the chip and tell other partners in crime they
1422 * have work to do.
1423 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424static int __init
1425lba_driver_probe(struct parisc_device *dev)
1426{
1427 struct lba_device *lba_dev;
1428 struct pci_bus *lba_bus;
1429 struct pci_ops *cfg_ops;
1430 u32 func_class;
1431 void *tmp_obj;
1432 char *version;
Helge Deller5076c152006-03-27 12:52:15 -07001433 void __iomem *addr = ioremap_nocache(dev->hpa.start, 4096);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434
1435 /* Read HW Rev First */
1436 func_class = READ_REG32(addr + LBA_FCLASS);
1437
1438 if (IS_ELROY(dev)) {
1439 func_class &= 0xf;
1440 switch (func_class) {
1441 case 0: version = "TR1.0"; break;
1442 case 1: version = "TR2.0"; break;
1443 case 2: version = "TR2.1"; break;
1444 case 3: version = "TR2.2"; break;
1445 case 4: version = "TR3.0"; break;
1446 case 5: version = "TR4.0"; break;
1447 default: version = "TR4+";
1448 }
1449
Kyle McMartinba9877b2006-08-24 21:28:58 -04001450 printk(KERN_INFO "Elroy version %s (0x%x) found at 0x%lx\n",
Matthew Wilcox645d11d2006-12-24 19:28:42 -07001451 version, func_class & 0xf, (long)dev->hpa.start);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452
1453 if (func_class < 2) {
1454 printk(KERN_WARNING "Can't support LBA older than "
1455 "TR2.1 - continuing under adversity.\n");
1456 }
1457
1458#if 0
1459/* Elroy TR4.0 should work with simple algorithm.
1460 But it doesn't. Still missing something. *sigh*
1461*/
1462 if (func_class > 4) {
1463 cfg_ops = &mercury_cfg_ops;
1464 } else
1465#endif
1466 {
1467 cfg_ops = &elroy_cfg_ops;
1468 }
1469
1470 } else if (IS_MERCURY(dev) || IS_QUICKSILVER(dev)) {
Kyle McMartinba9877b2006-08-24 21:28:58 -04001471 int major, minor;
1472
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473 func_class &= 0xff;
Kyle McMartinba9877b2006-08-24 21:28:58 -04001474 major = func_class >> 4, minor = func_class & 0xf;
1475
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476 /* We could use one printk for both Elroy and Mercury,
1477 * but for the mask for func_class.
1478 */
Kyle McMartinba9877b2006-08-24 21:28:58 -04001479 printk(KERN_INFO "%s version TR%d.%d (0x%x) found at 0x%lx\n",
1480 IS_MERCURY(dev) ? "Mercury" : "Quicksilver", major,
Matthew Wilcox645d11d2006-12-24 19:28:42 -07001481 minor, func_class, (long)dev->hpa.start);
Kyle McMartinba9877b2006-08-24 21:28:58 -04001482
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 cfg_ops = &mercury_cfg_ops;
1484 } else {
Matthew Wilcox645d11d2006-12-24 19:28:42 -07001485 printk(KERN_ERR "Unknown LBA found at 0x%lx\n",
1486 (long)dev->hpa.start);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 return -ENODEV;
1488 }
1489
Matthew Wilcox353dfe12006-11-18 10:11:03 -07001490 /* Tell I/O SAPIC driver we have a IRQ handler/region. */
Matthew Wilcox53f01bb2005-10-21 22:36:40 -04001491 tmp_obj = iosapic_register(dev->hpa.start + LBA_IOSAPIC_BASE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492
1493 /* NOTE: PCI devices (e.g. 103c:1005 graphics card) which don't
1494 ** have an IRT entry will get NULL back from iosapic code.
1495 */
1496
Helge Dellercb6fc182006-01-17 12:40:40 -07001497 lba_dev = kzalloc(sizeof(struct lba_device), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 if (!lba_dev) {
1499 printk(KERN_ERR "lba_init_chip - couldn't alloc lba_device\n");
1500 return(1);
1501 }
1502
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503
1504 /* ---------- First : initialize data we already have --------- */
1505
1506 lba_dev->hw_rev = func_class;
1507 lba_dev->hba.base_addr = addr;
1508 lba_dev->hba.dev = dev;
1509 lba_dev->iosapic_obj = tmp_obj; /* save interrupt handle */
1510 lba_dev->hba.iommu = sba_get_iommu(dev); /* get iommu data */
Kyle McMartinb0eecc42006-08-24 21:31:41 -04001511 parisc_set_drvdata(dev, lba_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512
1513 /* ------------ Second : initialize common stuff ---------- */
1514 pci_bios = &lba_bios_ops;
1515 pcibios_register_hba(HBA_DATA(lba_dev));
1516 spin_lock_init(&lba_dev->lba_lock);
1517
1518 if (lba_hw_init(lba_dev))
1519 return(1);
1520
1521 /* ---------- Third : setup I/O Port and MMIO resources --------- */
1522
1523 if (is_pdc_pat()) {
1524 /* PDC PAT firmware uses PIOP region of GMMIO space. */
1525 pci_port = &lba_pat_port_ops;
1526 /* Go ask PDC PAT what resources this LBA has */
1527 lba_pat_resources(dev, lba_dev);
1528 } else {
1529 if (!astro_iop_base) {
1530 /* Sprockets PDC uses NPIOP region */
Helge Deller5076c152006-03-27 12:52:15 -07001531 astro_iop_base = ioremap_nocache(LBA_PORT_BASE, 64 * 1024);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 pci_port = &lba_astro_port_ops;
1533 }
1534
1535 /* Poke the chip a bit for /proc output */
1536 lba_legacy_resources(dev, lba_dev);
1537 }
1538
Matthew Wilcox353dfe12006-11-18 10:11:03 -07001539 if (lba_dev->hba.bus_num.start < lba_next_bus)
1540 lba_dev->hba.bus_num.start = lba_next_bus;
1541
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542 dev->dev.platform_data = lba_dev;
1543 lba_bus = lba_dev->hba.hba_bus =
1544 pci_scan_bus_parented(&dev->dev, lba_dev->hba.bus_num.start,
1545 cfg_ops, NULL);
Matthew Wilcox353dfe12006-11-18 10:11:03 -07001546 if (lba_bus) {
1547 lba_next_bus = lba_bus->subordinate + 1;
Rajesh Shahc431ada2005-04-28 00:25:45 -07001548 pci_bus_add_devices(lba_bus);
Matthew Wilcox353dfe12006-11-18 10:11:03 -07001549 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550
1551 /* This is in lieu of calling pci_assign_unassigned_resources() */
1552 if (is_pdc_pat()) {
1553 /* assign resources to un-initialized devices */
1554
1555 DBG_PAT("LBA pci_bus_size_bridges()\n");
1556 pci_bus_size_bridges(lba_bus);
1557
1558 DBG_PAT("LBA pci_bus_assign_resources()\n");
1559 pci_bus_assign_resources(lba_bus);
1560
1561#ifdef DEBUG_LBA_PAT
1562 DBG_PAT("\nLBA PIOP resource tree\n");
1563 lba_dump_res(&lba_dev->hba.io_space, 2);
1564 DBG_PAT("\nLBA LMMIO resource tree\n");
1565 lba_dump_res(&lba_dev->hba.lmmio_space, 2);
1566#endif
1567 }
1568 pci_enable_bridges(lba_bus);
1569
1570
1571 /*
1572 ** Once PCI register ops has walked the bus, access to config
1573 ** space is restricted. Avoids master aborts on config cycles.
1574 ** Early LBA revs go fatal on *any* master abort.
1575 */
1576 if (cfg_ops == &elroy_cfg_ops) {
1577 lba_dev->flags |= LBA_FLAG_SKIP_PROBE;
1578 }
1579
1580 /* Whew! Finally done! Tell services we got this one covered. */
1581 return 0;
1582}
1583
1584static struct parisc_device_id lba_tbl[] = {
1585 { HPHW_BRIDGE, HVERSION_REV_ANY_ID, ELROY_HVERS, 0xa },
1586 { HPHW_BRIDGE, HVERSION_REV_ANY_ID, MERCURY_HVERS, 0xa },
1587 { HPHW_BRIDGE, HVERSION_REV_ANY_ID, QUICKSILVER_HVERS, 0xa },
1588 { 0, }
1589};
1590
1591static struct parisc_driver lba_driver = {
1592 .name = MODULE_NAME,
1593 .id_table = lba_tbl,
1594 .probe = lba_driver_probe,
1595};
1596
1597/*
1598** One time initialization to let the world know the LBA was found.
1599** Must be called exactly once before pci_init().
1600*/
1601void __init lba_init(void)
1602{
1603 register_parisc_driver(&lba_driver);
1604}
1605
1606/*
1607** Initialize the IBASE/IMASK registers for LBA (Elroy).
1608** Only called from sba_iommu.c in order to route ranges (MMIO vs DMA).
1609** sba_iommu is responsible for locking (none needed at init time).
1610*/
1611void lba_set_iregs(struct parisc_device *lba, u32 ibase, u32 imask)
1612{
Helge Deller5076c152006-03-27 12:52:15 -07001613 void __iomem * base_addr = ioremap_nocache(lba->hpa.start, 4096);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614
1615 imask <<= 2; /* adjust for hints - 2 more bits */
1616
1617 /* Make sure we aren't trying to set bits that aren't writeable. */
1618 WARN_ON((ibase & 0x001fffff) != 0);
1619 WARN_ON((imask & 0x001fffff) != 0);
1620
1621 DBG("%s() ibase 0x%x imask 0x%x\n", __FUNCTION__, ibase, imask);
1622 WRITE_REG32( imask, base_addr + LBA_IMASK);
1623 WRITE_REG32( ibase, base_addr + LBA_IBASE);
1624 iounmap(base_addr);
1625}
1626