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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2** System Bus Adapter (SBA) I/O MMU manager
3**
4** (c) Copyright 2000-2004 Grant Grundler <grundler @ parisc-linux x org>
5** (c) Copyright 2004 Naresh Kumar Inna <knaresh at india x hp x com>
6** (c) Copyright 2000-2004 Hewlett-Packard Company
7**
8** Portions (c) 1999 Dave S. Miller (from sparc64 I/O MMU code)
9**
10** This program is free software; you can redistribute it and/or modify
11** it under the terms of the GNU General Public License as published by
12** the Free Software Foundation; either version 2 of the License, or
13** (at your option) any later version.
14**
15**
16** This module initializes the IOC (I/O Controller) found on B1000/C3000/
17** J5000/J7000/N-class/L-class machines and their successors.
18**
19** FIXME: add DMA hint support programming in both sba and lba modules.
20*/
21
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/types.h>
23#include <linux/kernel.h>
24#include <linux/spinlock.h>
25#include <linux/slab.h>
26#include <linux/init.h>
27
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/pci.h>
31
32#include <asm/byteorder.h>
33#include <asm/io.h>
34#include <asm/dma.h> /* for DMA_CHUNK_SIZE */
35
36#include <asm/hardware.h> /* for register_parisc_driver() stuff */
37
38#include <linux/proc_fs.h>
Kyle McMartin7ec14e42006-02-06 10:10:15 -070039#include <linux/seq_file.h>
40
Kyle McMartin1790cf92006-08-24 21:32:49 -040041#include <asm/ropes.h>
Kyle McMartin6f034952006-08-13 22:18:57 -040042#include <asm/mckinley.h> /* for proc_mckinley_root */
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <asm/runway.h> /* for proc_runway_root */
44#include <asm/pdc.h> /* for PDC_MODEL_* */
45#include <asm/pdcpat.h> /* for is_pdc_pat() */
46#include <asm/parisc-device.h>
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#define MODULE_NAME "SBA"
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050/*
51** The number of debug flags is a clue - this code is fragile.
52** Don't even think about messing with it unless you have
53** plenty of 710's to sacrifice to the computer gods. :^)
54*/
55#undef DEBUG_SBA_INIT
56#undef DEBUG_SBA_RUN
57#undef DEBUG_SBA_RUN_SG
58#undef DEBUG_SBA_RESOURCE
59#undef ASSERT_PDIR_SANITY
60#undef DEBUG_LARGE_SG_ENTRIES
61#undef DEBUG_DMB_TRAP
62
63#ifdef DEBUG_SBA_INIT
64#define DBG_INIT(x...) printk(x)
65#else
66#define DBG_INIT(x...)
67#endif
68
69#ifdef DEBUG_SBA_RUN
70#define DBG_RUN(x...) printk(x)
71#else
72#define DBG_RUN(x...)
73#endif
74
75#ifdef DEBUG_SBA_RUN_SG
76#define DBG_RUN_SG(x...) printk(x)
77#else
78#define DBG_RUN_SG(x...)
79#endif
80
81
82#ifdef DEBUG_SBA_RESOURCE
83#define DBG_RES(x...) printk(x)
84#else
85#define DBG_RES(x...)
86#endif
87
Linus Torvalds1da177e2005-04-16 15:20:36 -070088#define SBA_INLINE __inline__
89
Linus Torvalds1da177e2005-04-16 15:20:36 -070090#define DEFAULT_DMA_HINT_REG 0
91
Kyle McMartin08a64362006-08-24 21:33:40 -040092struct sba_device *sba_list;
93EXPORT_SYMBOL_GPL(sba_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
95static unsigned long ioc_needs_fdc = 0;
96
97/* global count of IOMMUs in the system */
98static unsigned int global_ioc_cnt = 0;
99
100/* PA8700 (Piranha 2.2) bug workaround */
101static unsigned long piranha_bad_128k = 0;
102
103/* Looks nice and keeps the compiler happy */
104#define SBA_DEV(d) ((struct sba_device *) (d))
105
Kyle McMartin08a64362006-08-24 21:33:40 -0400106#ifdef CONFIG_AGP_PARISC
107#define SBA_AGP_SUPPORT
108#endif /*CONFIG_AGP_PARISC*/
109
Grant Grundler64908ad2005-10-21 22:37:20 -0400110#ifdef SBA_AGP_SUPPORT
Kyle McMartin08a64362006-08-24 21:33:40 -0400111static int sba_reserve_agpgart = 1;
Randy Dunlap29a1e1d2007-02-05 16:33:59 -0800112module_param(sba_reserve_agpgart, int, 0444);
Kyle McMartin08a64362006-08-24 21:33:40 -0400113MODULE_PARM_DESC(sba_reserve_agpgart, "Reserve half of IO pdir as AGPGART");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114#endif
115
116#define ROUNDUP(x,y) ((x + ((y)-1)) & ~((y)-1))
117
118
119/************************************
120** SBA register read and write support
121**
122** BE WARNED: register writes are posted.
123** (ie follow writes which must reach HW with a read)
124**
125** Superdome (in particular, REO) allows only 64-bit CSR accesses.
126*/
Grant Grundler40d78de2006-05-11 00:31:31 -0600127#define READ_REG32(addr) readl(addr)
128#define READ_REG64(addr) readq(addr)
129#define WRITE_REG32(val, addr) writel((val), (addr))
130#define WRITE_REG64(val, addr) writeq((val), (addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Grant Grundler64908ad2005-10-21 22:37:20 -0400132#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133#define READ_REG(addr) READ_REG64(addr)
134#define WRITE_REG(value, addr) WRITE_REG64(value, addr)
135#else
136#define READ_REG(addr) READ_REG32(addr)
137#define WRITE_REG(value, addr) WRITE_REG32(value, addr)
138#endif
139
140#ifdef DEBUG_SBA_INIT
141
Grant Grundler64908ad2005-10-21 22:37:20 -0400142/* NOTE: When CONFIG_64BIT isn't defined, READ_REG64() is two 32-bit reads */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
144/**
145 * sba_dump_ranges - debugging only - print ranges assigned to this IOA
146 * @hpa: base address of the sba
147 *
148 * Print the MMIO and IO Port address ranges forwarded by an Astro/Ike/RIO
149 * IO Adapter (aka Bus Converter).
150 */
151static void
152sba_dump_ranges(void __iomem *hpa)
153{
154 DBG_INIT("SBA at 0x%p\n", hpa);
155 DBG_INIT("IOS_DIST_BASE : %Lx\n", READ_REG64(hpa+IOS_DIST_BASE));
156 DBG_INIT("IOS_DIST_MASK : %Lx\n", READ_REG64(hpa+IOS_DIST_MASK));
157 DBG_INIT("IOS_DIST_ROUTE : %Lx\n", READ_REG64(hpa+IOS_DIST_ROUTE));
158 DBG_INIT("\n");
159 DBG_INIT("IOS_DIRECT_BASE : %Lx\n", READ_REG64(hpa+IOS_DIRECT_BASE));
160 DBG_INIT("IOS_DIRECT_MASK : %Lx\n", READ_REG64(hpa+IOS_DIRECT_MASK));
161 DBG_INIT("IOS_DIRECT_ROUTE: %Lx\n", READ_REG64(hpa+IOS_DIRECT_ROUTE));
162}
163
164/**
165 * sba_dump_tlb - debugging only - print IOMMU operating parameters
166 * @hpa: base address of the IOMMU
167 *
168 * Print the size/location of the IO MMU PDIR.
169 */
170static void sba_dump_tlb(void __iomem *hpa)
171{
172 DBG_INIT("IO TLB at 0x%p\n", hpa);
173 DBG_INIT("IOC_IBASE : 0x%Lx\n", READ_REG64(hpa+IOC_IBASE));
174 DBG_INIT("IOC_IMASK : 0x%Lx\n", READ_REG64(hpa+IOC_IMASK));
175 DBG_INIT("IOC_TCNFG : 0x%Lx\n", READ_REG64(hpa+IOC_TCNFG));
176 DBG_INIT("IOC_PDIR_BASE: 0x%Lx\n", READ_REG64(hpa+IOC_PDIR_BASE));
177 DBG_INIT("\n");
178}
179#else
180#define sba_dump_ranges(x)
181#define sba_dump_tlb(x)
Grant Grundler64908ad2005-10-21 22:37:20 -0400182#endif /* DEBUG_SBA_INIT */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
184
185#ifdef ASSERT_PDIR_SANITY
186
187/**
188 * sba_dump_pdir_entry - debugging only - print one IOMMU PDIR entry
189 * @ioc: IO MMU structure which owns the pdir we are interested in.
190 * @msg: text to print ont the output line.
191 * @pide: pdir index.
192 *
193 * Print one entry of the IO MMU PDIR in human readable form.
194 */
195static void
196sba_dump_pdir_entry(struct ioc *ioc, char *msg, uint pide)
197{
198 /* start printing from lowest pde in rval */
199 u64 *ptr = &(ioc->pdir_base[pide & (~0U * BITS_PER_LONG)]);
200 unsigned long *rptr = (unsigned long *) &(ioc->res_map[(pide >>3) & ~(sizeof(unsigned long) - 1)]);
201 uint rcnt;
202
203 printk(KERN_DEBUG "SBA: %s rp %p bit %d rval 0x%lx\n",
204 msg,
205 rptr, pide & (BITS_PER_LONG - 1), *rptr);
206
207 rcnt = 0;
208 while (rcnt < BITS_PER_LONG) {
209 printk(KERN_DEBUG "%s %2d %p %016Lx\n",
210 (rcnt == (pide & (BITS_PER_LONG - 1)))
211 ? " -->" : " ",
212 rcnt, ptr, *ptr );
213 rcnt++;
214 ptr++;
215 }
216 printk(KERN_DEBUG "%s", msg);
217}
218
219
220/**
221 * sba_check_pdir - debugging only - consistency checker
222 * @ioc: IO MMU structure which owns the pdir we are interested in.
223 * @msg: text to print ont the output line.
224 *
225 * Verify the resource map and pdir state is consistent
226 */
227static int
228sba_check_pdir(struct ioc *ioc, char *msg)
229{
230 u32 *rptr_end = (u32 *) &(ioc->res_map[ioc->res_size]);
231 u32 *rptr = (u32 *) ioc->res_map; /* resource map ptr */
232 u64 *pptr = ioc->pdir_base; /* pdir ptr */
233 uint pide = 0;
234
235 while (rptr < rptr_end) {
236 u32 rval = *rptr;
237 int rcnt = 32; /* number of bits we might check */
238
239 while (rcnt) {
240 /* Get last byte and highest bit from that */
241 u32 pde = ((u32) (((char *)pptr)[7])) << 24;
242 if ((rval ^ pde) & 0x80000000)
243 {
244 /*
245 ** BUMMER! -- res_map != pdir --
246 ** Dump rval and matching pdir entries
247 */
248 sba_dump_pdir_entry(ioc, msg, pide);
249 return(1);
250 }
251 rcnt--;
252 rval <<= 1; /* try the next bit */
253 pptr++;
254 pide++;
255 }
256 rptr++; /* look at next word of res_map */
257 }
258 /* It'd be nice if we always got here :^) */
259 return 0;
260}
261
262
263/**
264 * sba_dump_sg - debugging only - print Scatter-Gather list
265 * @ioc: IO MMU structure which owns the pdir we are interested in.
266 * @startsg: head of the SG list
267 * @nents: number of entries in SG list
268 *
269 * print the SG list so we can verify it's correct by hand.
270 */
271static void
272sba_dump_sg( struct ioc *ioc, struct scatterlist *startsg, int nents)
273{
274 while (nents-- > 0) {
275 printk(KERN_DEBUG " %d : %08lx/%05x %p/%05x\n",
276 nents,
277 (unsigned long) sg_dma_address(startsg),
278 sg_dma_len(startsg),
279 sg_virt_addr(startsg), startsg->length);
280 startsg++;
281 }
282}
283
284#endif /* ASSERT_PDIR_SANITY */
285
286
287
288
289/**************************************************************
290*
291* I/O Pdir Resource Management
292*
293* Bits set in the resource map are in use.
294* Each bit can represent a number of pages.
295* LSbs represent lower addresses (IOVA's).
296*
297***************************************************************/
298#define PAGES_PER_RANGE 1 /* could increase this to 4 or 8 if needed */
299
300/* Convert from IOVP to IOVA and vice versa. */
301
302#ifdef ZX1_SUPPORT
303/* Pluto (aka ZX1) boxes need to set or clear the ibase bits appropriately */
304#define SBA_IOVA(ioc,iovp,offset,hint_reg) ((ioc->ibase) | (iovp) | (offset))
305#define SBA_IOVP(ioc,iova) ((iova) & (ioc)->iovp_mask)
306#else
307/* only support Astro and ancestors. Saves a few cycles in key places */
308#define SBA_IOVA(ioc,iovp,offset,hint_reg) ((iovp) | (offset))
309#define SBA_IOVP(ioc,iova) (iova)
310#endif
311
312#define PDIR_INDEX(iovp) ((iovp)>>IOVP_SHIFT)
313
314#define RESMAP_MASK(n) (~0UL << (BITS_PER_LONG - (n)))
315#define RESMAP_IDX_MASK (sizeof(unsigned long) - 1)
316
317
318/**
319 * sba_search_bitmap - find free space in IO PDIR resource bitmap
320 * @ioc: IO MMU structure which owns the pdir we are interested in.
321 * @bits_wanted: number of entries we need.
322 *
323 * Find consecutive free bits in resource bitmap.
324 * Each bit represents one entry in the IO Pdir.
325 * Cool perf optimization: search for log2(size) bits at a time.
326 */
327static SBA_INLINE unsigned long
328sba_search_bitmap(struct ioc *ioc, unsigned long bits_wanted)
329{
330 unsigned long *res_ptr = ioc->res_hint;
331 unsigned long *res_end = (unsigned long *) &(ioc->res_map[ioc->res_size]);
332 unsigned long pide = ~0UL;
333
334 if (bits_wanted > (BITS_PER_LONG/2)) {
335 /* Search word at a time - no mask needed */
336 for(; res_ptr < res_end; ++res_ptr) {
337 if (*res_ptr == 0) {
338 *res_ptr = RESMAP_MASK(bits_wanted);
339 pide = ((unsigned long)res_ptr - (unsigned long)ioc->res_map);
340 pide <<= 3; /* convert to bit address */
341 break;
342 }
343 }
344 /* point to the next word on next pass */
345 res_ptr++;
346 ioc->res_bitshift = 0;
347 } else {
348 /*
349 ** Search the resource bit map on well-aligned values.
350 ** "o" is the alignment.
351 ** We need the alignment to invalidate I/O TLB using
352 ** SBA HW features in the unmap path.
353 */
354 unsigned long o = 1 << get_order(bits_wanted << PAGE_SHIFT);
355 uint bitshiftcnt = ROUNDUP(ioc->res_bitshift, o);
356 unsigned long mask;
357
358 if (bitshiftcnt >= BITS_PER_LONG) {
359 bitshiftcnt = 0;
360 res_ptr++;
361 }
362 mask = RESMAP_MASK(bits_wanted) >> bitshiftcnt;
363
364 DBG_RES("%s() o %ld %p", __FUNCTION__, o, res_ptr);
365 while(res_ptr < res_end)
366 {
367 DBG_RES(" %p %lx %lx\n", res_ptr, mask, *res_ptr);
368 WARN_ON(mask == 0);
369 if(((*res_ptr) & mask) == 0) {
370 *res_ptr |= mask; /* mark resources busy! */
371 pide = ((unsigned long)res_ptr - (unsigned long)ioc->res_map);
372 pide <<= 3; /* convert to bit address */
373 pide += bitshiftcnt;
374 break;
375 }
376 mask >>= o;
377 bitshiftcnt += o;
378 if (mask == 0) {
379 mask = RESMAP_MASK(bits_wanted);
380 bitshiftcnt=0;
381 res_ptr++;
382 }
383 }
384 /* look in the same word on the next pass */
385 ioc->res_bitshift = bitshiftcnt + bits_wanted;
386 }
387
388 /* wrapped ? */
389 if (res_end <= res_ptr) {
390 ioc->res_hint = (unsigned long *) ioc->res_map;
391 ioc->res_bitshift = 0;
392 } else {
393 ioc->res_hint = res_ptr;
394 }
395 return (pide);
396}
397
398
399/**
400 * sba_alloc_range - find free bits and mark them in IO PDIR resource bitmap
401 * @ioc: IO MMU structure which owns the pdir we are interested in.
402 * @size: number of bytes to create a mapping for
403 *
404 * Given a size, find consecutive unmarked and then mark those bits in the
405 * resource bit map.
406 */
407static int
408sba_alloc_range(struct ioc *ioc, size_t size)
409{
410 unsigned int pages_needed = size >> IOVP_SHIFT;
411#ifdef SBA_COLLECT_STATS
412 unsigned long cr_start = mfctl(16);
413#endif
414 unsigned long pide;
415
416 pide = sba_search_bitmap(ioc, pages_needed);
417 if (pide >= (ioc->res_size << 3)) {
418 pide = sba_search_bitmap(ioc, pages_needed);
419 if (pide >= (ioc->res_size << 3))
420 panic("%s: I/O MMU @ %p is out of mapping resources\n",
421 __FILE__, ioc->ioc_hpa);
422 }
423
424#ifdef ASSERT_PDIR_SANITY
425 /* verify the first enable bit is clear */
426 if(0x00 != ((u8 *) ioc->pdir_base)[pide*sizeof(u64) + 7]) {
427 sba_dump_pdir_entry(ioc, "sba_search_bitmap() botched it?", pide);
428 }
429#endif
430
431 DBG_RES("%s(%x) %d -> %lx hint %x/%x\n",
432 __FUNCTION__, size, pages_needed, pide,
433 (uint) ((unsigned long) ioc->res_hint - (unsigned long) ioc->res_map),
434 ioc->res_bitshift );
435
436#ifdef SBA_COLLECT_STATS
437 {
438 unsigned long cr_end = mfctl(16);
439 unsigned long tmp = cr_end - cr_start;
440 /* check for roll over */
441 cr_start = (cr_end < cr_start) ? -(tmp) : (tmp);
442 }
443 ioc->avg_search[ioc->avg_idx++] = cr_start;
444 ioc->avg_idx &= SBA_SEARCH_SAMPLE - 1;
445
446 ioc->used_pages += pages_needed;
447#endif
448
449 return (pide);
450}
451
452
453/**
454 * sba_free_range - unmark bits in IO PDIR resource bitmap
455 * @ioc: IO MMU structure which owns the pdir we are interested in.
456 * @iova: IO virtual address which was previously allocated.
457 * @size: number of bytes to create a mapping for
458 *
459 * clear bits in the ioc's resource map
460 */
461static SBA_INLINE void
462sba_free_range(struct ioc *ioc, dma_addr_t iova, size_t size)
463{
464 unsigned long iovp = SBA_IOVP(ioc, iova);
465 unsigned int pide = PDIR_INDEX(iovp);
466 unsigned int ridx = pide >> 3; /* convert bit to byte address */
467 unsigned long *res_ptr = (unsigned long *) &((ioc)->res_map[ridx & ~RESMAP_IDX_MASK]);
468
469 int bits_not_wanted = size >> IOVP_SHIFT;
470
471 /* 3-bits "bit" address plus 2 (or 3) bits for "byte" == bit in word */
472 unsigned long m = RESMAP_MASK(bits_not_wanted) >> (pide & (BITS_PER_LONG - 1));
473
474 DBG_RES("%s( ,%x,%x) %x/%lx %x %p %lx\n",
475 __FUNCTION__, (uint) iova, size,
476 bits_not_wanted, m, pide, res_ptr, *res_ptr);
477
478#ifdef SBA_COLLECT_STATS
479 ioc->used_pages -= bits_not_wanted;
480#endif
481
482 *res_ptr &= ~m;
483}
484
485
486/**************************************************************
487*
488* "Dynamic DMA Mapping" support (aka "Coherent I/O")
489*
490***************************************************************/
491
Grant Grundler64908ad2005-10-21 22:37:20 -0400492#ifdef SBA_HINT_SUPPORT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493#define SBA_DMA_HINT(ioc, val) ((val) << (ioc)->hint_shift_pdir)
494#endif
495
496typedef unsigned long space_t;
497#define KERNEL_SPACE 0
498
499/**
500 * sba_io_pdir_entry - fill in one IO PDIR entry
501 * @pdir_ptr: pointer to IO PDIR entry
502 * @sid: process Space ID - currently only support KERNEL_SPACE
503 * @vba: Virtual CPU address of buffer to map
504 * @hint: DMA hint set to use for this mapping
505 *
506 * SBA Mapping Routine
507 *
508 * Given a virtual address (vba, arg2) and space id, (sid, arg1)
509 * sba_io_pdir_entry() loads the I/O PDIR entry pointed to by
510 * pdir_ptr (arg0).
511 * Using the bass-ackwards HP bit numbering, Each IO Pdir entry
512 * for Astro/Ike looks like:
513 *
514 *
515 * 0 19 51 55 63
516 * +-+---------------------+----------------------------------+----+--------+
517 * |V| U | PPN[43:12] | U | VI |
518 * +-+---------------------+----------------------------------+----+--------+
519 *
520 * Pluto is basically identical, supports fewer physical address bits:
521 *
522 * 0 23 51 55 63
523 * +-+------------------------+-------------------------------+----+--------+
524 * |V| U | PPN[39:12] | U | VI |
525 * +-+------------------------+-------------------------------+----+--------+
526 *
527 * V == Valid Bit (Most Significant Bit is bit 0)
528 * U == Unused
529 * PPN == Physical Page Number
530 * VI == Virtual Index (aka Coherent Index)
531 *
532 * LPA instruction output is put into PPN field.
533 * LCI (Load Coherence Index) instruction provides the "VI" bits.
534 *
535 * We pre-swap the bytes since PCX-W is Big Endian and the
536 * IOMMU uses little endian for the pdir.
537 */
538
539void SBA_INLINE
540sba_io_pdir_entry(u64 *pdir_ptr, space_t sid, unsigned long vba,
541 unsigned long hint)
542{
543 u64 pa; /* physical address */
544 register unsigned ci; /* coherent index */
545
546 pa = virt_to_phys(vba);
547 pa &= IOVP_MASK;
548
549 mtsp(sid,1);
550 asm("lci 0(%%sr1, %1), %0" : "=r" (ci) : "r" (vba));
551 pa |= (ci >> 12) & 0xff; /* move CI (8 bits) into lowest byte */
552
Kyle McMartin983daee2006-08-25 12:28:24 -0400553 pa |= SBA_PDIR_VALID_BIT; /* set "valid" bit */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 *pdir_ptr = cpu_to_le64(pa); /* swap and store into I/O Pdir */
555
556 /*
557 * If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set
558 * (bit #61, big endian), we have to flush and sync every time
559 * IO-PDIR is changed in Ike/Astro.
560 */
Grant Grundler64908ad2005-10-21 22:37:20 -0400561 if (ioc_needs_fdc)
562 asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563}
564
565
566/**
567 * sba_mark_invalid - invalidate one or more IO PDIR entries
568 * @ioc: IO MMU structure which owns the pdir we are interested in.
569 * @iova: IO Virtual Address mapped earlier
570 * @byte_cnt: number of bytes this mapping covers.
571 *
572 * Marking the IO PDIR entry(ies) as Invalid and invalidate
573 * corresponding IO TLB entry. The Ike PCOM (Purge Command Register)
574 * is to purge stale entries in the IO TLB when unmapping entries.
575 *
576 * The PCOM register supports purging of multiple pages, with a minium
577 * of 1 page and a maximum of 2GB. Hardware requires the address be
578 * aligned to the size of the range being purged. The size of the range
579 * must be a power of 2. The "Cool perf optimization" in the
580 * allocation routine helps keep that true.
581 */
582static SBA_INLINE void
583sba_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt)
584{
585 u32 iovp = (u32) SBA_IOVP(ioc,iova);
Grant Grundler64908ad2005-10-21 22:37:20 -0400586 u64 *pdir_ptr = &ioc->pdir_base[PDIR_INDEX(iovp)];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
588#ifdef ASSERT_PDIR_SANITY
Grant Grundler64908ad2005-10-21 22:37:20 -0400589 /* Assert first pdir entry is set.
590 **
591 ** Even though this is a big-endian machine, the entries
592 ** in the iopdir are little endian. That's why we look at
593 ** the byte at +7 instead of at +0.
594 */
595 if (0x80 != (((u8 *) pdir_ptr)[7])) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 sba_dump_pdir_entry(ioc,"sba_mark_invalid()", PDIR_INDEX(iovp));
597 }
598#endif
599
Grant Grundler64908ad2005-10-21 22:37:20 -0400600 if (byte_cnt > IOVP_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 {
Grant Grundler64908ad2005-10-21 22:37:20 -0400602#if 0
603 unsigned long entries_per_cacheline = ioc_needs_fdc ?
604 L1_CACHE_ALIGN(((unsigned long) pdir_ptr))
605 - (unsigned long) pdir_ptr;
606 : 262144;
607#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
Grant Grundler64908ad2005-10-21 22:37:20 -0400609 /* set "size" field for PCOM */
610 iovp |= get_order(byte_cnt) + PAGE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 do {
613 /* clear I/O Pdir entry "valid" bit first */
Grant Grundler64908ad2005-10-21 22:37:20 -0400614 ((u8 *) pdir_ptr)[7] = 0;
615 if (ioc_needs_fdc) {
616 asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));
617#if 0
618 entries_per_cacheline = L1_CACHE_SHIFT - 3;
619#endif
620 }
621 pdir_ptr++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 byte_cnt -= IOVP_SIZE;
Grant Grundler64908ad2005-10-21 22:37:20 -0400623 } while (byte_cnt > IOVP_SIZE);
624 } else
625 iovp |= IOVP_SHIFT; /* set "size" field for PCOM */
626
627 /*
628 ** clear I/O PDIR entry "valid" bit.
629 ** We have to R/M/W the cacheline regardless how much of the
630 ** pdir entry that we clobber.
631 ** The rest of the entry would be useful for debugging if we
632 ** could dump core on HPMC.
633 */
634 ((u8 *) pdir_ptr)[7] = 0;
635 if (ioc_needs_fdc)
636 asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637
638 WRITE_REG( SBA_IOVA(ioc, iovp, 0, 0), ioc->ioc_hpa+IOC_PCOM);
639}
640
641/**
642 * sba_dma_supported - PCI driver can query DMA support
643 * @dev: instance of PCI owned by the driver that's asking
644 * @mask: number of address bits this PCI device can handle
645 *
646 * See Documentation/DMA-mapping.txt
647 */
648static int sba_dma_supported( struct device *dev, u64 mask)
649{
650 struct ioc *ioc;
Grant Grundler64908ad2005-10-21 22:37:20 -0400651
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 if (dev == NULL) {
653 printk(KERN_ERR MODULE_NAME ": EISA/ISA/et al not supported\n");
654 BUG();
655 return(0);
656 }
657
Grant Grundler64908ad2005-10-21 22:37:20 -0400658 /* Documentation/DMA-mapping.txt tells drivers to try 64-bit first,
659 * then fall back to 32-bit if that fails.
660 * We are just "encouraging" 32-bit DMA masks here since we can
661 * never allow IOMMU bypass unless we add special support for ZX1.
662 */
663 if (mask > ~0U)
664 return 0;
665
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 ioc = GET_IOC(dev);
667
Grant Grundler64908ad2005-10-21 22:37:20 -0400668 /*
669 * check if mask is >= than the current max IO Virt Address
670 * The max IO Virt address will *always* < 30 bits.
671 */
672 return((int)(mask >= (ioc->ibase - 1 +
673 (ioc->pdir_size / sizeof(u64) * IOVP_SIZE) )));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674}
675
676
677/**
678 * sba_map_single - map one buffer and return IOVA for DMA
679 * @dev: instance of PCI owned by the driver that's asking.
680 * @addr: driver buffer to map.
681 * @size: number of bytes to map in driver buffer.
682 * @direction: R/W or both.
683 *
684 * See Documentation/DMA-mapping.txt
685 */
686static dma_addr_t
687sba_map_single(struct device *dev, void *addr, size_t size,
688 enum dma_data_direction direction)
689{
690 struct ioc *ioc;
691 unsigned long flags;
692 dma_addr_t iovp;
693 dma_addr_t offset;
694 u64 *pdir_start;
695 int pide;
696
697 ioc = GET_IOC(dev);
698
699 /* save offset bits */
700 offset = ((dma_addr_t) (long) addr) & ~IOVP_MASK;
701
702 /* round up to nearest IOVP_SIZE */
703 size = (size + offset + ~IOVP_MASK) & IOVP_MASK;
704
705 spin_lock_irqsave(&ioc->res_lock, flags);
706#ifdef ASSERT_PDIR_SANITY
707 sba_check_pdir(ioc,"Check before sba_map_single()");
708#endif
709
710#ifdef SBA_COLLECT_STATS
711 ioc->msingle_calls++;
712 ioc->msingle_pages += size >> IOVP_SHIFT;
713#endif
714 pide = sba_alloc_range(ioc, size);
715 iovp = (dma_addr_t) pide << IOVP_SHIFT;
716
717 DBG_RUN("%s() 0x%p -> 0x%lx\n",
718 __FUNCTION__, addr, (long) iovp | offset);
719
720 pdir_start = &(ioc->pdir_base[pide]);
721
722 while (size > 0) {
723 sba_io_pdir_entry(pdir_start, KERNEL_SPACE, (unsigned long) addr, 0);
724
725 DBG_RUN(" pdir 0x%p %02x%02x%02x%02x%02x%02x%02x%02x\n",
726 pdir_start,
727 (u8) (((u8 *) pdir_start)[7]),
728 (u8) (((u8 *) pdir_start)[6]),
729 (u8) (((u8 *) pdir_start)[5]),
730 (u8) (((u8 *) pdir_start)[4]),
731 (u8) (((u8 *) pdir_start)[3]),
732 (u8) (((u8 *) pdir_start)[2]),
733 (u8) (((u8 *) pdir_start)[1]),
734 (u8) (((u8 *) pdir_start)[0])
735 );
736
737 addr += IOVP_SIZE;
738 size -= IOVP_SIZE;
739 pdir_start++;
740 }
Grant Grundler64908ad2005-10-21 22:37:20 -0400741
742 /* force FDC ops in io_pdir_entry() to be visible to IOMMU */
743 if (ioc_needs_fdc)
744 asm volatile("sync" : : );
745
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746#ifdef ASSERT_PDIR_SANITY
747 sba_check_pdir(ioc,"Check after sba_map_single()");
748#endif
749 spin_unlock_irqrestore(&ioc->res_lock, flags);
Grant Grundler64908ad2005-10-21 22:37:20 -0400750
751 /* form complete address */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 return SBA_IOVA(ioc, iovp, offset, DEFAULT_DMA_HINT_REG);
753}
754
755
756/**
757 * sba_unmap_single - unmap one IOVA and free resources
758 * @dev: instance of PCI owned by the driver that's asking.
759 * @iova: IOVA of driver buffer previously mapped.
760 * @size: number of bytes mapped in driver buffer.
761 * @direction: R/W or both.
762 *
763 * See Documentation/DMA-mapping.txt
764 */
765static void
766sba_unmap_single(struct device *dev, dma_addr_t iova, size_t size,
767 enum dma_data_direction direction)
768{
769 struct ioc *ioc;
770#if DELAYED_RESOURCE_CNT > 0
771 struct sba_dma_pair *d;
772#endif
773 unsigned long flags;
774 dma_addr_t offset;
775
776 DBG_RUN("%s() iovp 0x%lx/%x\n", __FUNCTION__, (long) iova, size);
777
778 ioc = GET_IOC(dev);
779 offset = iova & ~IOVP_MASK;
780 iova ^= offset; /* clear offset bits */
781 size += offset;
782 size = ROUNDUP(size, IOVP_SIZE);
783
784 spin_lock_irqsave(&ioc->res_lock, flags);
785
786#ifdef SBA_COLLECT_STATS
787 ioc->usingle_calls++;
788 ioc->usingle_pages += size >> IOVP_SHIFT;
789#endif
790
791 sba_mark_invalid(ioc, iova, size);
792
793#if DELAYED_RESOURCE_CNT > 0
794 /* Delaying when we re-use a IO Pdir entry reduces the number
795 * of MMIO reads needed to flush writes to the PCOM register.
796 */
797 d = &(ioc->saved[ioc->saved_cnt]);
798 d->iova = iova;
799 d->size = size;
800 if (++(ioc->saved_cnt) >= DELAYED_RESOURCE_CNT) {
801 int cnt = ioc->saved_cnt;
802 while (cnt--) {
803 sba_free_range(ioc, d->iova, d->size);
804 d--;
805 }
806 ioc->saved_cnt = 0;
Grant Grundler64908ad2005-10-21 22:37:20 -0400807
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 READ_REG(ioc->ioc_hpa+IOC_PCOM); /* flush purges */
809 }
810#else /* DELAYED_RESOURCE_CNT == 0 */
811 sba_free_range(ioc, iova, size);
Grant Grundler64908ad2005-10-21 22:37:20 -0400812
813 /* If fdc's were issued, force fdc's to be visible now */
814 if (ioc_needs_fdc)
815 asm volatile("sync" : : );
816
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 READ_REG(ioc->ioc_hpa+IOC_PCOM); /* flush purges */
818#endif /* DELAYED_RESOURCE_CNT == 0 */
Grant Grundler64908ad2005-10-21 22:37:20 -0400819
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 spin_unlock_irqrestore(&ioc->res_lock, flags);
821
822 /* XXX REVISIT for 2.5 Linux - need syncdma for zero-copy support.
823 ** For Astro based systems this isn't a big deal WRT performance.
824 ** As long as 2.4 kernels copyin/copyout data from/to userspace,
825 ** we don't need the syncdma. The issue here is I/O MMU cachelines
826 ** are *not* coherent in all cases. May be hwrev dependent.
827 ** Need to investigate more.
828 asm volatile("syncdma");
829 */
830}
831
832
833/**
834 * sba_alloc_consistent - allocate/map shared mem for DMA
835 * @hwdev: instance of PCI owned by the driver that's asking.
836 * @size: number of bytes mapped in driver buffer.
837 * @dma_handle: IOVA of new buffer.
838 *
839 * See Documentation/DMA-mapping.txt
840 */
841static void *sba_alloc_consistent(struct device *hwdev, size_t size,
Al Viro5c1fb412005-10-21 03:21:28 -0400842 dma_addr_t *dma_handle, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843{
844 void *ret;
845
846 if (!hwdev) {
847 /* only support PCI */
848 *dma_handle = 0;
Matthew Wilcoxc2c47982006-10-26 10:06:07 -0600849 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 }
851
852 ret = (void *) __get_free_pages(gfp, get_order(size));
853
854 if (ret) {
855 memset(ret, 0, size);
856 *dma_handle = sba_map_single(hwdev, ret, size, 0);
857 }
858
859 return ret;
860}
861
862
863/**
864 * sba_free_consistent - free/unmap shared mem for DMA
865 * @hwdev: instance of PCI owned by the driver that's asking.
866 * @size: number of bytes mapped in driver buffer.
867 * @vaddr: virtual address IOVA of "consistent" buffer.
868 * @dma_handler: IO virtual address of "consistent" buffer.
869 *
870 * See Documentation/DMA-mapping.txt
871 */
872static void
873sba_free_consistent(struct device *hwdev, size_t size, void *vaddr,
874 dma_addr_t dma_handle)
875{
876 sba_unmap_single(hwdev, dma_handle, size, 0);
877 free_pages((unsigned long) vaddr, get_order(size));
878}
879
880
881/*
882** Since 0 is a valid pdir_base index value, can't use that
883** to determine if a value is valid or not. Use a flag to indicate
884** the SG list entry contains a valid pdir index.
885*/
886#define PIDE_FLAG 0x80000000UL
887
888#ifdef SBA_COLLECT_STATS
889#define IOMMU_MAP_STATS
890#endif
891#include "iommu-helpers.h"
892
893#ifdef DEBUG_LARGE_SG_ENTRIES
894int dump_run_sg = 0;
895#endif
896
897
898/**
899 * sba_map_sg - map Scatter/Gather list
900 * @dev: instance of PCI owned by the driver that's asking.
901 * @sglist: array of buffer/length pairs
902 * @nents: number of entries in list
903 * @direction: R/W or both.
904 *
905 * See Documentation/DMA-mapping.txt
906 */
907static int
908sba_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
909 enum dma_data_direction direction)
910{
911 struct ioc *ioc;
912 int coalesced, filled = 0;
913 unsigned long flags;
914
915 DBG_RUN_SG("%s() START %d entries\n", __FUNCTION__, nents);
916
917 ioc = GET_IOC(dev);
918
919 /* Fast path single entry scatterlists. */
920 if (nents == 1) {
921 sg_dma_address(sglist) = sba_map_single(dev,
922 (void *)sg_virt_addr(sglist),
923 sglist->length, direction);
924 sg_dma_len(sglist) = sglist->length;
925 return 1;
926 }
927
928 spin_lock_irqsave(&ioc->res_lock, flags);
929
930#ifdef ASSERT_PDIR_SANITY
931 if (sba_check_pdir(ioc,"Check before sba_map_sg()"))
932 {
933 sba_dump_sg(ioc, sglist, nents);
934 panic("Check before sba_map_sg()");
935 }
936#endif
937
938#ifdef SBA_COLLECT_STATS
939 ioc->msg_calls++;
940#endif
941
942 /*
943 ** First coalesce the chunks and allocate I/O pdir space
944 **
945 ** If this is one DMA stream, we can properly map using the
946 ** correct virtual address associated with each DMA page.
947 ** w/o this association, we wouldn't have coherent DMA!
948 ** Access to the virtual address is what forces a two pass algorithm.
949 */
950 coalesced = iommu_coalesce_chunks(ioc, sglist, nents, sba_alloc_range);
951
952 /*
953 ** Program the I/O Pdir
954 **
955 ** map the virtual addresses to the I/O Pdir
956 ** o dma_address will contain the pdir index
957 ** o dma_len will contain the number of bytes to map
958 ** o address contains the virtual address.
959 */
960 filled = iommu_fill_pdir(ioc, sglist, nents, 0, sba_io_pdir_entry);
961
Grant Grundler64908ad2005-10-21 22:37:20 -0400962 /* force FDC ops in io_pdir_entry() to be visible to IOMMU */
963 if (ioc_needs_fdc)
964 asm volatile("sync" : : );
965
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966#ifdef ASSERT_PDIR_SANITY
967 if (sba_check_pdir(ioc,"Check after sba_map_sg()"))
968 {
969 sba_dump_sg(ioc, sglist, nents);
970 panic("Check after sba_map_sg()\n");
971 }
972#endif
973
974 spin_unlock_irqrestore(&ioc->res_lock, flags);
975
976 DBG_RUN_SG("%s() DONE %d mappings\n", __FUNCTION__, filled);
977
978 return filled;
979}
980
981
982/**
983 * sba_unmap_sg - unmap Scatter/Gather list
984 * @dev: instance of PCI owned by the driver that's asking.
985 * @sglist: array of buffer/length pairs
986 * @nents: number of entries in list
987 * @direction: R/W or both.
988 *
989 * See Documentation/DMA-mapping.txt
990 */
991static void
992sba_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents,
993 enum dma_data_direction direction)
994{
995 struct ioc *ioc;
996#ifdef ASSERT_PDIR_SANITY
997 unsigned long flags;
998#endif
999
1000 DBG_RUN_SG("%s() START %d entries, %p,%x\n",
1001 __FUNCTION__, nents, sg_virt_addr(sglist), sglist->length);
1002
1003 ioc = GET_IOC(dev);
1004
1005#ifdef SBA_COLLECT_STATS
1006 ioc->usg_calls++;
1007#endif
1008
1009#ifdef ASSERT_PDIR_SANITY
1010 spin_lock_irqsave(&ioc->res_lock, flags);
1011 sba_check_pdir(ioc,"Check before sba_unmap_sg()");
1012 spin_unlock_irqrestore(&ioc->res_lock, flags);
1013#endif
1014
1015 while (sg_dma_len(sglist) && nents--) {
1016
1017 sba_unmap_single(dev, sg_dma_address(sglist), sg_dma_len(sglist), direction);
1018#ifdef SBA_COLLECT_STATS
1019 ioc->usg_pages += ((sg_dma_address(sglist) & ~IOVP_MASK) + sg_dma_len(sglist) + IOVP_SIZE - 1) >> PAGE_SHIFT;
1020 ioc->usingle_calls--; /* kluge since call is unmap_sg() */
1021#endif
1022 ++sglist;
1023 }
1024
1025 DBG_RUN_SG("%s() DONE (nents %d)\n", __FUNCTION__, nents);
1026
1027#ifdef ASSERT_PDIR_SANITY
1028 spin_lock_irqsave(&ioc->res_lock, flags);
1029 sba_check_pdir(ioc,"Check after sba_unmap_sg()");
1030 spin_unlock_irqrestore(&ioc->res_lock, flags);
1031#endif
1032
1033}
1034
1035static struct hppa_dma_ops sba_ops = {
1036 .dma_supported = sba_dma_supported,
1037 .alloc_consistent = sba_alloc_consistent,
1038 .alloc_noncoherent = sba_alloc_consistent,
1039 .free_consistent = sba_free_consistent,
1040 .map_single = sba_map_single,
1041 .unmap_single = sba_unmap_single,
1042 .map_sg = sba_map_sg,
1043 .unmap_sg = sba_unmap_sg,
1044 .dma_sync_single_for_cpu = NULL,
1045 .dma_sync_single_for_device = NULL,
1046 .dma_sync_sg_for_cpu = NULL,
1047 .dma_sync_sg_for_device = NULL,
1048};
1049
1050
1051/**************************************************************************
1052**
1053** SBA PAT PDC support
1054**
1055** o call pdc_pat_cell_module()
1056** o store ranges in PCI "resource" structures
1057**
1058**************************************************************************/
1059
1060static void
1061sba_get_pat_resources(struct sba_device *sba_dev)
1062{
1063#if 0
1064/*
1065** TODO/REVISIT/FIXME: support for directed ranges requires calls to
1066** PAT PDC to program the SBA/LBA directed range registers...this
1067** burden may fall on the LBA code since it directly supports the
1068** PCI subsystem. It's not clear yet. - ggg
1069*/
1070PAT_MOD(mod)->mod_info.mod_pages = PAT_GET_MOD_PAGES(temp);
1071 FIXME : ???
1072PAT_MOD(mod)->mod_info.dvi = PAT_GET_DVI(temp);
1073 Tells where the dvi bits are located in the address.
1074PAT_MOD(mod)->mod_info.ioc = PAT_GET_IOC(temp);
1075 FIXME : ???
1076#endif
1077}
1078
1079
1080/**************************************************************
1081*
1082* Initialization and claim
1083*
1084***************************************************************/
1085#define PIRANHA_ADDR_MASK 0x00160000UL /* bit 17,18,20 */
1086#define PIRANHA_ADDR_VAL 0x00060000UL /* bit 17,18 on */
1087static void *
1088sba_alloc_pdir(unsigned int pdir_size)
1089{
1090 unsigned long pdir_base;
1091 unsigned long pdir_order = get_order(pdir_size);
1092
1093 pdir_base = __get_free_pages(GFP_KERNEL, pdir_order);
Grant Grundler64908ad2005-10-21 22:37:20 -04001094 if (NULL == (void *) pdir_base) {
1095 panic("%s() could not allocate I/O Page Table\n",
1096 __FUNCTION__);
1097 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098
1099 /* If this is not PA8700 (PCX-W2)
1100 ** OR newer than ver 2.2
1101 ** OR in a system that doesn't need VINDEX bits from SBA,
1102 **
1103 ** then we aren't exposed to the HW bug.
1104 */
1105 if ( ((boot_cpu_data.pdc.cpuid >> 5) & 0x7f) != 0x13
1106 || (boot_cpu_data.pdc.versions > 0x202)
1107 || (boot_cpu_data.pdc.capabilities & 0x08L) )
1108 return (void *) pdir_base;
1109
1110 /*
1111 * PA8700 (PCX-W2, aka piranha) silent data corruption fix
1112 *
1113 * An interaction between PA8700 CPU (Ver 2.2 or older) and
1114 * Ike/Astro can cause silent data corruption. This is only
1115 * a problem if the I/O PDIR is located in memory such that
1116 * (little-endian) bits 17 and 18 are on and bit 20 is off.
1117 *
1118 * Since the max IO Pdir size is 2MB, by cleverly allocating the
1119 * right physical address, we can either avoid (IOPDIR <= 1MB)
1120 * or minimize (2MB IO Pdir) the problem if we restrict the
1121 * IO Pdir to a maximum size of 2MB-128K (1902K).
1122 *
1123 * Because we always allocate 2^N sized IO pdirs, either of the
1124 * "bad" regions will be the last 128K if at all. That's easy
1125 * to test for.
1126 *
1127 */
1128 if (pdir_order <= (19-12)) {
1129 if (((virt_to_phys(pdir_base)+pdir_size-1) & PIRANHA_ADDR_MASK) == PIRANHA_ADDR_VAL) {
1130 /* allocate a new one on 512k alignment */
1131 unsigned long new_pdir = __get_free_pages(GFP_KERNEL, (19-12));
1132 /* release original */
1133 free_pages(pdir_base, pdir_order);
1134
1135 pdir_base = new_pdir;
1136
1137 /* release excess */
1138 while (pdir_order < (19-12)) {
1139 new_pdir += pdir_size;
1140 free_pages(new_pdir, pdir_order);
1141 pdir_order +=1;
1142 pdir_size <<=1;
1143 }
1144 }
1145 } else {
1146 /*
1147 ** 1MB or 2MB Pdir
1148 ** Needs to be aligned on an "odd" 1MB boundary.
1149 */
1150 unsigned long new_pdir = __get_free_pages(GFP_KERNEL, pdir_order+1); /* 2 or 4MB */
1151
1152 /* release original */
1153 free_pages( pdir_base, pdir_order);
1154
1155 /* release first 1MB */
1156 free_pages(new_pdir, 20-12);
1157
1158 pdir_base = new_pdir + 1024*1024;
1159
1160 if (pdir_order > (20-12)) {
1161 /*
1162 ** 2MB Pdir.
1163 **
1164 ** Flag tells init_bitmap() to mark bad 128k as used
1165 ** and to reduce the size by 128k.
1166 */
1167 piranha_bad_128k = 1;
1168
1169 new_pdir += 3*1024*1024;
1170 /* release last 1MB */
1171 free_pages(new_pdir, 20-12);
1172
1173 /* release unusable 128KB */
1174 free_pages(new_pdir - 128*1024 , 17-12);
1175
1176 pdir_size -= 128*1024;
1177 }
1178 }
1179
1180 memset((void *) pdir_base, 0, pdir_size);
1181 return (void *) pdir_base;
1182}
1183
Matthew Wilcox56583742005-10-21 22:33:38 -04001184static struct device *next_device(struct klist_iter *i)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185{
Matthew Wilcox56583742005-10-21 22:33:38 -04001186 struct klist_node * n = klist_next(i);
1187 return n ? container_of(n, struct device, knode_parent) : NULL;
1188}
1189
1190/* setup Mercury or Elroy IBASE/IMASK registers. */
1191static void
1192setup_ibase_imask(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
1193{
1194 /* lba_set_iregs() is in drivers/parisc/lba_pci.c */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 extern void lba_set_iregs(struct parisc_device *, u32, u32);
1196 struct device *dev;
Matthew Wilcox56583742005-10-21 22:33:38 -04001197 struct klist_iter i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198
Matthew Wilcox56583742005-10-21 22:33:38 -04001199 klist_iter_init(&sba->dev.klist_children, &i);
1200 while ((dev = next_device(&i))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 struct parisc_device *lba = to_parisc_device(dev);
Matthew Wilcox56583742005-10-21 22:33:38 -04001202 int rope_num = (lba->hpa.start >> 13) & 0xf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 if (rope_num >> 3 == ioc_num)
1204 lba_set_iregs(lba, ioc->ibase, ioc->imask);
1205 }
Matthew Wilcox56583742005-10-21 22:33:38 -04001206 klist_iter_exit(&i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207}
1208
1209static void
1210sba_ioc_init_pluto(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
1211{
1212 u32 iova_space_mask;
1213 u32 iova_space_size;
1214 int iov_order, tcnfg;
Grant Grundler64908ad2005-10-21 22:37:20 -04001215#ifdef SBA_AGP_SUPPORT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 int agp_found = 0;
1217#endif
1218 /*
1219 ** Firmware programs the base and size of a "safe IOVA space"
1220 ** (one that doesn't overlap memory or LMMIO space) in the
1221 ** IBASE and IMASK registers.
1222 */
1223 ioc->ibase = READ_REG(ioc->ioc_hpa + IOC_IBASE);
1224 iova_space_size = ~(READ_REG(ioc->ioc_hpa + IOC_IMASK) & 0xFFFFFFFFUL) + 1;
1225
1226 if ((ioc->ibase < 0xfed00000UL) && ((ioc->ibase + iova_space_size) > 0xfee00000UL)) {
1227 printk("WARNING: IOV space overlaps local config and interrupt message, truncating\n");
1228 iova_space_size /= 2;
1229 }
1230
1231 /*
1232 ** iov_order is always based on a 1GB IOVA space since we want to
1233 ** turn on the other half for AGP GART.
1234 */
1235 iov_order = get_order(iova_space_size >> (IOVP_SHIFT - PAGE_SHIFT));
1236 ioc->pdir_size = (iova_space_size / IOVP_SIZE) * sizeof(u64);
1237
Grant Grundler40d78de2006-05-11 00:31:31 -06001238 DBG_INIT("%s() hpa 0x%p IOV %dMB (%d bits)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 __FUNCTION__, ioc->ioc_hpa, iova_space_size >> 20,
1240 iov_order + PAGE_SHIFT);
1241
1242 ioc->pdir_base = (void *) __get_free_pages(GFP_KERNEL,
1243 get_order(ioc->pdir_size));
1244 if (!ioc->pdir_base)
1245 panic("Couldn't allocate I/O Page Table\n");
1246
1247 memset(ioc->pdir_base, 0, ioc->pdir_size);
1248
1249 DBG_INIT("%s() pdir %p size %x\n",
1250 __FUNCTION__, ioc->pdir_base, ioc->pdir_size);
1251
Grant Grundler64908ad2005-10-21 22:37:20 -04001252#ifdef SBA_HINT_SUPPORT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 ioc->hint_shift_pdir = iov_order + PAGE_SHIFT;
1254 ioc->hint_mask_pdir = ~(0x3 << (iov_order + PAGE_SHIFT));
1255
1256 DBG_INIT(" hint_shift_pdir %x hint_mask_pdir %lx\n",
1257 ioc->hint_shift_pdir, ioc->hint_mask_pdir);
1258#endif
1259
1260 WARN_ON((((unsigned long) ioc->pdir_base) & PAGE_MASK) != (unsigned long) ioc->pdir_base);
1261 WRITE_REG(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE);
1262
1263 /* build IMASK for IOC and Elroy */
1264 iova_space_mask = 0xffffffff;
1265 iova_space_mask <<= (iov_order + PAGE_SHIFT);
1266 ioc->imask = iova_space_mask;
1267#ifdef ZX1_SUPPORT
1268 ioc->iovp_mask = ~(iova_space_mask + PAGE_SIZE - 1);
1269#endif
1270 sba_dump_tlb(ioc->ioc_hpa);
1271
1272 setup_ibase_imask(sba, ioc, ioc_num);
1273
1274 WRITE_REG(ioc->imask, ioc->ioc_hpa + IOC_IMASK);
1275
Grant Grundler64908ad2005-10-21 22:37:20 -04001276#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 /*
1278 ** Setting the upper bits makes checking for bypass addresses
1279 ** a little faster later on.
1280 */
1281 ioc->imask |= 0xFFFFFFFF00000000UL;
1282#endif
1283
1284 /* Set I/O PDIR Page size to system page size */
1285 switch (PAGE_SHIFT) {
1286 case 12: tcnfg = 0; break; /* 4K */
1287 case 13: tcnfg = 1; break; /* 8K */
1288 case 14: tcnfg = 2; break; /* 16K */
1289 case 16: tcnfg = 3; break; /* 64K */
1290 default:
1291 panic(__FILE__ "Unsupported system page size %d",
1292 1 << PAGE_SHIFT);
1293 break;
1294 }
1295 WRITE_REG(tcnfg, ioc->ioc_hpa + IOC_TCNFG);
1296
1297 /*
1298 ** Program the IOC's ibase and enable IOVA translation
1299 ** Bit zero == enable bit.
1300 */
1301 WRITE_REG(ioc->ibase | 1, ioc->ioc_hpa + IOC_IBASE);
1302
1303 /*
1304 ** Clear I/O TLB of any possible entries.
1305 ** (Yes. This is a bit paranoid...but so what)
1306 */
1307 WRITE_REG(ioc->ibase | 31, ioc->ioc_hpa + IOC_PCOM);
1308
Grant Grundler64908ad2005-10-21 22:37:20 -04001309#ifdef SBA_AGP_SUPPORT
Kyle McMartin08a64362006-08-24 21:33:40 -04001310{
1311 struct klist_iter i;
1312 struct device *dev = NULL;
1313
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314 /*
1315 ** If an AGP device is present, only use half of the IOV space
1316 ** for PCI DMA. Unfortunately we can't know ahead of time
1317 ** whether GART support will actually be used, for now we
1318 ** can just key on any AGP device found in the system.
1319 ** We program the next pdir index after we stop w/ a key for
1320 ** the GART code to handshake on.
1321 */
Kyle McMartin08a64362006-08-24 21:33:40 -04001322 klist_iter_init(&sba->dev.klist_children, &i);
Matthew Wilcoxee9f4b52006-10-04 13:08:33 -06001323 while ((dev = next_device(&i))) {
Kyle McMartin08a64362006-08-24 21:33:40 -04001324 struct parisc_device *lba = to_parisc_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 if (IS_QUICKSILVER(lba))
Kyle McMartin08a64362006-08-24 21:33:40 -04001326 agp_found = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 }
Matthew Wilcoxee9f4b52006-10-04 13:08:33 -06001328 klist_iter_exit(&i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329
Kyle McMartin08a64362006-08-24 21:33:40 -04001330 if (agp_found && sba_reserve_agpgart) {
1331 printk(KERN_INFO "%s: reserving %dMb of IOVA space for agpgart\n",
1332 __FUNCTION__, (iova_space_size/2) >> 20);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 ioc->pdir_size /= 2;
Kyle McMartin08a64362006-08-24 21:33:40 -04001334 ioc->pdir_base[PDIR_INDEX(iova_space_size/2)] = SBA_AGPGART_COOKIE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 }
Kyle McMartin08a64362006-08-24 21:33:40 -04001336}
1337#endif /*SBA_AGP_SUPPORT*/
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338
1339}
1340
1341static void
1342sba_ioc_init(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
1343{
1344 u32 iova_space_size, iova_space_mask;
1345 unsigned int pdir_size, iov_order;
1346
1347 /*
1348 ** Determine IOVA Space size from memory size.
1349 **
1350 ** Ideally, PCI drivers would register the maximum number
1351 ** of DMA they can have outstanding for each device they
1352 ** own. Next best thing would be to guess how much DMA
1353 ** can be outstanding based on PCI Class/sub-class. Both
1354 ** methods still require some "extra" to support PCI
1355 ** Hot-Plug/Removal of PCI cards. (aka PCI OLARD).
1356 **
1357 ** While we have 32-bits "IOVA" space, top two 2 bits are used
1358 ** for DMA hints - ergo only 30 bits max.
1359 */
1360
1361 iova_space_size = (u32) (num_physpages/global_ioc_cnt);
1362
1363 /* limit IOVA space size to 1MB-1GB */
1364 if (iova_space_size < (1 << (20 - PAGE_SHIFT))) {
1365 iova_space_size = 1 << (20 - PAGE_SHIFT);
1366 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 else if (iova_space_size > (1 << (30 - PAGE_SHIFT))) {
1368 iova_space_size = 1 << (30 - PAGE_SHIFT);
1369 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370
1371 /*
1372 ** iova space must be log2() in size.
1373 ** thus, pdir/res_map will also be log2().
1374 ** PIRANHA BUG: Exception is when IO Pdir is 2MB (gets reduced)
1375 */
1376 iov_order = get_order(iova_space_size << PAGE_SHIFT);
1377
1378 /* iova_space_size is now bytes, not pages */
1379 iova_space_size = 1 << (iov_order + PAGE_SHIFT);
1380
1381 ioc->pdir_size = pdir_size = (iova_space_size/IOVP_SIZE) * sizeof(u64);
1382
1383 DBG_INIT("%s() hpa 0x%lx mem %ldMB IOV %dMB (%d bits)\n",
1384 __FUNCTION__,
1385 ioc->ioc_hpa,
1386 (unsigned long) num_physpages >> (20 - PAGE_SHIFT),
1387 iova_space_size>>20,
1388 iov_order + PAGE_SHIFT);
1389
1390 ioc->pdir_base = sba_alloc_pdir(pdir_size);
1391
1392 DBG_INIT("%s() pdir %p size %x\n",
1393 __FUNCTION__, ioc->pdir_base, pdir_size);
1394
Grant Grundler64908ad2005-10-21 22:37:20 -04001395#ifdef SBA_HINT_SUPPORT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 /* FIXME : DMA HINTs not used */
1397 ioc->hint_shift_pdir = iov_order + PAGE_SHIFT;
1398 ioc->hint_mask_pdir = ~(0x3 << (iov_order + PAGE_SHIFT));
1399
1400 DBG_INIT(" hint_shift_pdir %x hint_mask_pdir %lx\n",
1401 ioc->hint_shift_pdir, ioc->hint_mask_pdir);
1402#endif
1403
1404 WRITE_REG64(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE);
1405
1406 /* build IMASK for IOC and Elroy */
1407 iova_space_mask = 0xffffffff;
1408 iova_space_mask <<= (iov_order + PAGE_SHIFT);
1409
1410 /*
1411 ** On C3000 w/512MB mem, HP-UX 10.20 reports:
1412 ** ibase=0, imask=0xFE000000, size=0x2000000.
1413 */
1414 ioc->ibase = 0;
1415 ioc->imask = iova_space_mask; /* save it */
1416#ifdef ZX1_SUPPORT
1417 ioc->iovp_mask = ~(iova_space_mask + PAGE_SIZE - 1);
1418#endif
1419
1420 DBG_INIT("%s() IOV base 0x%lx mask 0x%0lx\n",
1421 __FUNCTION__, ioc->ibase, ioc->imask);
1422
1423 /*
1424 ** FIXME: Hint registers are programmed with default hint
1425 ** values during boot, so hints should be sane even if we
1426 ** can't reprogram them the way drivers want.
1427 */
1428
1429 setup_ibase_imask(sba, ioc, ioc_num);
1430
1431 /*
1432 ** Program the IOC's ibase and enable IOVA translation
1433 */
1434 WRITE_REG(ioc->ibase | 1, ioc->ioc_hpa+IOC_IBASE);
1435 WRITE_REG(ioc->imask, ioc->ioc_hpa+IOC_IMASK);
1436
1437 /* Set I/O PDIR Page size to 4K */
1438 WRITE_REG(0, ioc->ioc_hpa+IOC_TCNFG);
1439
1440 /*
1441 ** Clear I/O TLB of any possible entries.
1442 ** (Yes. This is a bit paranoid...but so what)
1443 */
1444 WRITE_REG(0 | 31, ioc->ioc_hpa+IOC_PCOM);
1445
1446 ioc->ibase = 0; /* used by SBA_IOVA and related macros */
1447
1448 DBG_INIT("%s() DONE\n", __FUNCTION__);
1449}
1450
1451
1452
1453/**************************************************************************
1454**
1455** SBA initialization code (HW and SW)
1456**
1457** o identify SBA chip itself
1458** o initialize SBA chip modes (HardFail)
1459** o initialize SBA chip modes (HardFail)
1460** o FIXME: initialize DMA hints for reasonable defaults
1461**
1462**************************************************************************/
1463
Helge Deller5076c152006-03-27 12:52:15 -07001464static void __iomem *ioc_remap(struct sba_device *sba_dev, unsigned int offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465{
Helge Deller5076c152006-03-27 12:52:15 -07001466 return ioremap_nocache(sba_dev->dev->hpa.start + offset, SBA_FUNC_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467}
1468
1469static void sba_hw_init(struct sba_device *sba_dev)
1470{
1471 int i;
1472 int num_ioc;
1473 u64 ioc_ctl;
1474
1475 if (!is_pdc_pat()) {
1476 /* Shutdown the USB controller on Astro-based workstations.
1477 ** Once we reprogram the IOMMU, the next DMA performed by
1478 ** USB will HPMC the box. USB is only enabled if a
1479 ** keyboard is present and found.
1480 **
1481 ** With serial console, j6k v5.0 firmware says:
1482 ** mem_kbd hpa 0xfee003f8 sba 0x0 pad 0x0 cl_class 0x7
1483 **
1484 ** FIXME: Using GFX+USB console at power up but direct
1485 ** linux to serial console is still broken.
1486 ** USB could generate DMA so we must reset USB.
1487 ** The proper sequence would be:
1488 ** o block console output
1489 ** o reset USB device
1490 ** o reprogram serial port
1491 ** o unblock console output
1492 */
1493 if (PAGE0->mem_kbd.cl_class == CL_KEYBD) {
1494 pdc_io_reset_devices();
1495 }
1496
1497 }
1498
1499
1500#if 0
1501printk("sba_hw_init(): mem_boot 0x%x 0x%x 0x%x 0x%x\n", PAGE0->mem_boot.hpa,
1502 PAGE0->mem_boot.spa, PAGE0->mem_boot.pad, PAGE0->mem_boot.cl_class);
1503
1504 /*
1505 ** Need to deal with DMA from LAN.
1506 ** Maybe use page zero boot device as a handle to talk
1507 ** to PDC about which device to shutdown.
1508 **
1509 ** Netbooting, j6k v5.0 firmware says:
1510 ** mem_boot hpa 0xf4008000 sba 0x0 pad 0x0 cl_class 0x1002
1511 ** ARGH! invalid class.
1512 */
1513 if ((PAGE0->mem_boot.cl_class != CL_RANDOM)
1514 && (PAGE0->mem_boot.cl_class != CL_SEQU)) {
1515 pdc_io_reset();
1516 }
1517#endif
1518
Kyle McMartin1b240f42006-08-24 21:30:19 -04001519 if (!IS_PLUTO(sba_dev->dev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520 ioc_ctl = READ_REG(sba_dev->sba_hpa+IOC_CTRL);
1521 DBG_INIT("%s() hpa 0x%lx ioc_ctl 0x%Lx ->",
1522 __FUNCTION__, sba_dev->sba_hpa, ioc_ctl);
1523 ioc_ctl &= ~(IOC_CTRL_RM | IOC_CTRL_NC | IOC_CTRL_CE);
1524 ioc_ctl |= IOC_CTRL_DD | IOC_CTRL_D4 | IOC_CTRL_TC;
1525 /* j6700 v1.6 firmware sets 0x294f */
1526 /* A500 firmware sets 0x4d */
1527
1528 WRITE_REG(ioc_ctl, sba_dev->sba_hpa+IOC_CTRL);
1529
1530#ifdef DEBUG_SBA_INIT
1531 ioc_ctl = READ_REG64(sba_dev->sba_hpa+IOC_CTRL);
1532 DBG_INIT(" 0x%Lx\n", ioc_ctl);
1533#endif
1534 } /* if !PLUTO */
1535
Kyle McMartin1b240f42006-08-24 21:30:19 -04001536 if (IS_ASTRO(sba_dev->dev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538 sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, ASTRO_IOC_OFFSET);
1539 num_ioc = 1;
1540
1541 sba_dev->chip_resv.name = "Astro Intr Ack";
1542 sba_dev->chip_resv.start = PCI_F_EXTEND | 0xfef00000UL;
1543 sba_dev->chip_resv.end = PCI_F_EXTEND | (0xff000000UL - 1) ;
1544 err = request_resource(&iomem_resource, &(sba_dev->chip_resv));
Eric Sesterhennb7494552006-03-24 18:52:10 +01001545 BUG_ON(err < 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546
Kyle McMartin1b240f42006-08-24 21:30:19 -04001547 } else if (IS_PLUTO(sba_dev->dev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548 int err;
1549
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550 sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, PLUTO_IOC_OFFSET);
1551 num_ioc = 1;
1552
1553 sba_dev->chip_resv.name = "Pluto Intr/PIOP/VGA";
1554 sba_dev->chip_resv.start = PCI_F_EXTEND | 0xfee00000UL;
1555 sba_dev->chip_resv.end = PCI_F_EXTEND | (0xff200000UL - 1);
1556 err = request_resource(&iomem_resource, &(sba_dev->chip_resv));
1557 WARN_ON(err < 0);
1558
1559 sba_dev->iommu_resv.name = "IOVA Space";
1560 sba_dev->iommu_resv.start = 0x40000000UL;
1561 sba_dev->iommu_resv.end = 0x50000000UL - 1;
1562 err = request_resource(&iomem_resource, &(sba_dev->iommu_resv));
1563 WARN_ON(err < 0);
1564 } else {
Matthew Wilcox78860892006-09-12 05:19:15 -06001565 /* IKE, REO */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566 sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, IKE_IOC_OFFSET(0));
1567 sba_dev->ioc[1].ioc_hpa = ioc_remap(sba_dev, IKE_IOC_OFFSET(1));
1568 num_ioc = 2;
1569
1570 /* TODO - LOOKUP Ike/Stretch chipset mem map */
1571 }
Matthew Wilcox78860892006-09-12 05:19:15 -06001572 /* XXX: What about Reo Grande? */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573
1574 sba_dev->num_ioc = num_ioc;
1575 for (i = 0; i < num_ioc; i++) {
Grant Grundler40d78de2006-05-11 00:31:31 -06001576 void __iomem *ioc_hpa = sba_dev->ioc[i].ioc_hpa;
Grant Grundlerb312c332006-03-30 07:13:21 +00001577 unsigned int j;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578
Grant Grundlerb312c332006-03-30 07:13:21 +00001579 for (j=0; j < sizeof(u64) * ROPES_PER_IOC; j+=sizeof(u64)) {
1580
1581 /*
1582 * Clear ROPE(N)_CONFIG AO bit.
1583 * Disables "NT Ordering" (~= !"Relaxed Ordering")
1584 * Overrides bit 1 in DMA Hint Sets.
1585 * Improves netperf UDP_STREAM by ~10% for bcm5701.
1586 */
Kyle McMartin1b240f42006-08-24 21:30:19 -04001587 if (IS_PLUTO(sba_dev->dev)) {
Grant Grundler40d78de2006-05-11 00:31:31 -06001588 void __iomem *rope_cfg;
1589 unsigned long cfg_val;
Grant Grundlerb312c332006-03-30 07:13:21 +00001590
1591 rope_cfg = ioc_hpa + IOC_ROPE0_CFG + j;
1592 cfg_val = READ_REG(rope_cfg);
1593 cfg_val &= ~IOC_ROPE_AO;
1594 WRITE_REG(cfg_val, rope_cfg);
1595 }
1596
1597 /*
1598 ** Make sure the box crashes on rope errors.
1599 */
1600 WRITE_REG(HF_ENABLE, ioc_hpa + ROPE0_CTL + j);
1601 }
1602
1603 /* flush out the last writes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604 READ_REG(sba_dev->ioc[i].ioc_hpa + ROPE7_CTL);
1605
1606 DBG_INIT(" ioc[%d] ROPE_CFG 0x%Lx ROPE_DBG 0x%Lx\n",
1607 i,
1608 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x40),
1609 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x50)
1610 );
1611 DBG_INIT(" STATUS_CONTROL 0x%Lx FLUSH_CTRL 0x%Lx\n",
1612 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x108),
1613 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x400)
1614 );
1615
Kyle McMartin1b240f42006-08-24 21:30:19 -04001616 if (IS_PLUTO(sba_dev->dev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617 sba_ioc_init_pluto(sba_dev->dev, &(sba_dev->ioc[i]), i);
1618 } else {
1619 sba_ioc_init(sba_dev->dev, &(sba_dev->ioc[i]), i);
1620 }
1621 }
1622}
1623
1624static void
1625sba_common_init(struct sba_device *sba_dev)
1626{
1627 int i;
1628
1629 /* add this one to the head of the list (order doesn't matter)
1630 ** This will be useful for debugging - especially if we get coredumps
1631 */
1632 sba_dev->next = sba_list;
1633 sba_list = sba_dev;
1634
1635 for(i=0; i< sba_dev->num_ioc; i++) {
1636 int res_size;
1637#ifdef DEBUG_DMB_TRAP
1638 extern void iterate_pages(unsigned long , unsigned long ,
1639 void (*)(pte_t * , unsigned long),
1640 unsigned long );
1641 void set_data_memory_break(pte_t * , unsigned long);
1642#endif
1643 /* resource map size dictated by pdir_size */
1644 res_size = sba_dev->ioc[i].pdir_size/sizeof(u64); /* entries */
1645
1646 /* Second part of PIRANHA BUG */
1647 if (piranha_bad_128k) {
1648 res_size -= (128*1024)/sizeof(u64);
1649 }
1650
1651 res_size >>= 3; /* convert bit count to byte count */
1652 DBG_INIT("%s() res_size 0x%x\n",
1653 __FUNCTION__, res_size);
1654
1655 sba_dev->ioc[i].res_size = res_size;
1656 sba_dev->ioc[i].res_map = (char *) __get_free_pages(GFP_KERNEL, get_order(res_size));
1657
1658#ifdef DEBUG_DMB_TRAP
1659 iterate_pages( sba_dev->ioc[i].res_map, res_size,
1660 set_data_memory_break, 0);
1661#endif
1662
1663 if (NULL == sba_dev->ioc[i].res_map)
1664 {
1665 panic("%s:%s() could not allocate resource map\n",
1666 __FILE__, __FUNCTION__ );
1667 }
1668
1669 memset(sba_dev->ioc[i].res_map, 0, res_size);
1670 /* next available IOVP - circular search */
1671 sba_dev->ioc[i].res_hint = (unsigned long *)
1672 &(sba_dev->ioc[i].res_map[L1_CACHE_BYTES]);
1673
1674#ifdef ASSERT_PDIR_SANITY
1675 /* Mark first bit busy - ie no IOVA 0 */
1676 sba_dev->ioc[i].res_map[0] = 0x80;
1677 sba_dev->ioc[i].pdir_base[0] = 0xeeffc0addbba0080ULL;
1678#endif
1679
1680 /* Third (and last) part of PIRANHA BUG */
1681 if (piranha_bad_128k) {
1682 /* region from +1408K to +1536 is un-usable. */
1683
1684 int idx_start = (1408*1024/sizeof(u64)) >> 3;
1685 int idx_end = (1536*1024/sizeof(u64)) >> 3;
1686 long *p_start = (long *) &(sba_dev->ioc[i].res_map[idx_start]);
1687 long *p_end = (long *) &(sba_dev->ioc[i].res_map[idx_end]);
1688
1689 /* mark that part of the io pdir busy */
1690 while (p_start < p_end)
1691 *p_start++ = -1;
1692
1693 }
1694
1695#ifdef DEBUG_DMB_TRAP
1696 iterate_pages( sba_dev->ioc[i].res_map, res_size,
1697 set_data_memory_break, 0);
1698 iterate_pages( sba_dev->ioc[i].pdir_base, sba_dev->ioc[i].pdir_size,
1699 set_data_memory_break, 0);
1700#endif
1701
1702 DBG_INIT("%s() %d res_map %x %p\n",
1703 __FUNCTION__, i, res_size, sba_dev->ioc[i].res_map);
1704 }
1705
1706 spin_lock_init(&sba_dev->sba_lock);
1707 ioc_needs_fdc = boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC;
1708
1709#ifdef DEBUG_SBA_INIT
1710 /*
1711 * If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set
1712 * (bit #61, big endian), we have to flush and sync every time
1713 * IO-PDIR is changed in Ike/Astro.
1714 */
Kyle McMartin692086e2006-05-30 17:50:29 +00001715 if (ioc_needs_fdc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716 printk(KERN_INFO MODULE_NAME " FDC/SYNC required.\n");
1717 } else {
1718 printk(KERN_INFO MODULE_NAME " IOC has cache coherent PDIR.\n");
1719 }
1720#endif
1721}
1722
1723#ifdef CONFIG_PROC_FS
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001724static int sba_proc_info(struct seq_file *m, void *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725{
1726 struct sba_device *sba_dev = sba_list;
1727 struct ioc *ioc = &sba_dev->ioc[0]; /* FIXME: Multi-IOC support! */
1728 int total_pages = (int) (ioc->res_size << 3); /* 8 bits per byte */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729#ifdef SBA_COLLECT_STATS
1730 unsigned long avg = 0, min, max;
1731#endif
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001732 int i, len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001733
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001734 len += seq_printf(m, "%s rev %d.%d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001735 sba_dev->name,
1736 (sba_dev->hw_rev & 0x7) + 1,
1737 (sba_dev->hw_rev & 0x18) >> 3
1738 );
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001739 len += seq_printf(m, "IO PDIR size : %d bytes (%d entries)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740 (int) ((ioc->res_size << 3) * sizeof(u64)), /* 8 bits/byte */
1741 total_pages);
1742
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001743 len += seq_printf(m, "Resource bitmap : %d bytes (%d pages)\n",
1744 ioc->res_size, ioc->res_size << 3); /* 8 bits per byte */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001746 len += seq_printf(m, "LMMIO_BASE/MASK/ROUTE %08x %08x %08x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747 READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_BASE),
1748 READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_MASK),
1749 READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_ROUTE)
1750 );
1751
1752 for (i=0; i<4; i++)
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001753 len += seq_printf(m, "DIR%d_BASE/MASK/ROUTE %08x %08x %08x\n", i,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_BASE + i*0x18),
1755 READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_MASK + i*0x18),
1756 READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_ROUTE + i*0x18)
1757 );
1758
1759#ifdef SBA_COLLECT_STATS
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001760 len += seq_printf(m, "IO PDIR entries : %ld free %ld used (%d%%)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761 total_pages - ioc->used_pages, ioc->used_pages,
1762 (int) (ioc->used_pages * 100 / total_pages));
1763
1764 min = max = ioc->avg_search[0];
1765 for (i = 0; i < SBA_SEARCH_SAMPLE; i++) {
1766 avg += ioc->avg_search[i];
1767 if (ioc->avg_search[i] > max) max = ioc->avg_search[i];
1768 if (ioc->avg_search[i] < min) min = ioc->avg_search[i];
1769 }
1770 avg /= SBA_SEARCH_SAMPLE;
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001771 len += seq_printf(m, " Bitmap search : %ld/%ld/%ld (min/avg/max CPU Cycles)\n",
1772 min, avg, max);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001774 len += seq_printf(m, "pci_map_single(): %12ld calls %12ld pages (avg %d/1000)\n",
1775 ioc->msingle_calls, ioc->msingle_pages,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001776 (int) ((ioc->msingle_pages * 1000)/ioc->msingle_calls));
1777
1778 /* KLUGE - unmap_sg calls unmap_single for each mapped page */
1779 min = ioc->usingle_calls;
1780 max = ioc->usingle_pages - ioc->usg_pages;
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001781 len += seq_printf(m, "pci_unmap_single: %12ld calls %12ld pages (avg %d/1000)\n",
1782 min, max, (int) ((max * 1000)/min));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001784 len += seq_printf(m, "pci_map_sg() : %12ld calls %12ld pages (avg %d/1000)\n",
1785 ioc->msg_calls, ioc->msg_pages,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001786 (int) ((ioc->msg_pages * 1000)/ioc->msg_calls));
1787
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001788 len += seq_printf(m, "pci_unmap_sg() : %12ld calls %12ld pages (avg %d/1000)\n",
1789 ioc->usg_calls, ioc->usg_pages,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001790 (int) ((ioc->usg_pages * 1000)/ioc->usg_calls));
1791#endif
1792
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001793 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794}
1795
Linus Torvalds1da177e2005-04-16 15:20:36 -07001796static int
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001797sba_proc_open(struct inode *i, struct file *f)
1798{
1799 return single_open(f, &sba_proc_info, NULL);
1800}
1801
Arjan van de Vend54b1fd2007-02-12 00:55:34 -08001802static const struct file_operations sba_proc_fops = {
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001803 .owner = THIS_MODULE,
1804 .open = sba_proc_open,
1805 .read = seq_read,
1806 .llseek = seq_lseek,
1807 .release = single_release,
1808};
1809
1810static int
1811sba_proc_bitmap_info(struct seq_file *m, void *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001812{
1813 struct sba_device *sba_dev = sba_list;
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001814 struct ioc *ioc = &sba_dev->ioc[0]; /* FIXME: Multi-IOC support! */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001815 unsigned int *res_ptr = (unsigned int *)ioc->res_map;
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001816 int i, len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001818 for (i = 0; i < (ioc->res_size/sizeof(unsigned int)); ++i, ++res_ptr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819 if ((i & 7) == 0)
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001820 len += seq_printf(m, "\n ");
1821 len += seq_printf(m, " %08x", *res_ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822 }
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001823 len += seq_printf(m, "\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001825 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001826}
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001827
1828static int
1829sba_proc_bitmap_open(struct inode *i, struct file *f)
1830{
1831 return single_open(f, &sba_proc_bitmap_info, NULL);
1832}
1833
Arjan van de Vend54b1fd2007-02-12 00:55:34 -08001834static const struct file_operations sba_proc_bitmap_fops = {
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001835 .owner = THIS_MODULE,
1836 .open = sba_proc_bitmap_open,
1837 .read = seq_read,
1838 .llseek = seq_lseek,
1839 .release = single_release,
1840};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841#endif /* CONFIG_PROC_FS */
1842
1843static struct parisc_device_id sba_tbl[] = {
1844 { HPHW_IOA, HVERSION_REV_ANY_ID, ASTRO_RUNWAY_PORT, 0xb },
1845 { HPHW_BCPORT, HVERSION_REV_ANY_ID, IKE_MERCED_PORT, 0xc },
1846 { HPHW_BCPORT, HVERSION_REV_ANY_ID, REO_MERCED_PORT, 0xc },
1847 { HPHW_BCPORT, HVERSION_REV_ANY_ID, REOG_MERCED_PORT, 0xc },
1848 { HPHW_IOA, HVERSION_REV_ANY_ID, PLUTO_MCKINLEY_PORT, 0xc },
1849 { 0, }
1850};
1851
1852int sba_driver_callback(struct parisc_device *);
1853
1854static struct parisc_driver sba_driver = {
1855 .name = MODULE_NAME,
1856 .id_table = sba_tbl,
1857 .probe = sba_driver_callback,
1858};
1859
1860/*
1861** Determine if sba should claim this chip (return 0) or not (return 1).
1862** If so, initialize the chip and tell other partners in crime they
1863** have work to do.
1864*/
1865int
1866sba_driver_callback(struct parisc_device *dev)
1867{
1868 struct sba_device *sba_dev;
1869 u32 func_class;
1870 int i;
1871 char *version;
Helge Deller5076c152006-03-27 12:52:15 -07001872 void __iomem *sba_addr = ioremap_nocache(dev->hpa.start, SBA_FUNC_SIZE);
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001873 struct proc_dir_entry *info_entry, *bitmap_entry, *root;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001874
1875 sba_dump_ranges(sba_addr);
1876
1877 /* Read HW Rev First */
1878 func_class = READ_REG(sba_addr + SBA_FCLASS);
1879
Kyle McMartin1b240f42006-08-24 21:30:19 -04001880 if (IS_ASTRO(dev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881 unsigned long fclass;
1882 static char astro_rev[]="Astro ?.?";
1883
1884 /* Astro is broken...Read HW Rev First */
1885 fclass = READ_REG(sba_addr);
1886
1887 astro_rev[6] = '1' + (char) (fclass & 0x7);
1888 astro_rev[8] = '0' + (char) ((fclass & 0x18) >> 3);
1889 version = astro_rev;
1890
Kyle McMartin1b240f42006-08-24 21:30:19 -04001891 } else if (IS_IKE(dev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892 static char ike_rev[] = "Ike rev ?";
1893 ike_rev[8] = '0' + (char) (func_class & 0xff);
1894 version = ike_rev;
Kyle McMartin1b240f42006-08-24 21:30:19 -04001895 } else if (IS_PLUTO(dev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896 static char pluto_rev[]="Pluto ?.?";
1897 pluto_rev[6] = '0' + (char) ((func_class & 0xf0) >> 4);
1898 pluto_rev[8] = '0' + (char) (func_class & 0x0f);
1899 version = pluto_rev;
1900 } else {
1901 static char reo_rev[] = "REO rev ?";
1902 reo_rev[8] = '0' + (char) (func_class & 0xff);
1903 version = reo_rev;
1904 }
1905
1906 if (!global_ioc_cnt) {
1907 global_ioc_cnt = count_parisc_driver(&sba_driver);
1908
1909 /* Astro and Pluto have one IOC per SBA */
Kyle McMartin1b240f42006-08-24 21:30:19 -04001910 if ((!IS_ASTRO(dev)) || (!IS_PLUTO(dev)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911 global_ioc_cnt *= 2;
1912 }
1913
1914 printk(KERN_INFO "%s found %s at 0x%lx\n",
Matthew Wilcox53f01bb2005-10-21 22:36:40 -04001915 MODULE_NAME, version, dev->hpa.start);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916
Helge Dellercb6fc182006-01-17 12:40:40 -07001917 sba_dev = kzalloc(sizeof(struct sba_device), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 if (!sba_dev) {
1919 printk(KERN_ERR MODULE_NAME " - couldn't alloc sba_device\n");
1920 return -ENOMEM;
1921 }
1922
1923 parisc_set_drvdata(dev, sba_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924
1925 for(i=0; i<MAX_IOC; i++)
1926 spin_lock_init(&(sba_dev->ioc[i].res_lock));
1927
1928 sba_dev->dev = dev;
1929 sba_dev->hw_rev = func_class;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930 sba_dev->name = dev->name;
1931 sba_dev->sba_hpa = sba_addr;
1932
1933 sba_get_pat_resources(sba_dev);
1934 sba_hw_init(sba_dev);
1935 sba_common_init(sba_dev);
1936
1937 hppa_dma_ops = &sba_ops;
1938
1939#ifdef CONFIG_PROC_FS
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001940 switch (dev->id.hversion) {
1941 case PLUTO_MCKINLEY_PORT:
1942 root = proc_mckinley_root;
1943 break;
1944 case ASTRO_RUNWAY_PORT:
1945 case IKE_MERCED_PORT:
1946 default:
1947 root = proc_runway_root;
1948 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949 }
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001950
1951 info_entry = create_proc_entry("sba_iommu", 0, root);
1952 bitmap_entry = create_proc_entry("sba_iommu-bitmap", 0, root);
1953
1954 if (info_entry)
1955 info_entry->proc_fops = &sba_proc_fops;
1956
1957 if (bitmap_entry)
1958 bitmap_entry->proc_fops = &sba_proc_bitmap_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959#endif
Kyle McMartin7ec14e42006-02-06 10:10:15 -07001960
Linus Torvalds1da177e2005-04-16 15:20:36 -07001961 parisc_vmerge_boundary = IOVP_SIZE;
1962 parisc_vmerge_max_size = IOVP_SIZE * BITS_PER_LONG;
1963 parisc_has_iommu();
1964 return 0;
1965}
1966
1967/*
1968** One time initialization to let the world know the SBA was found.
1969** This is the only routine which is NOT static.
1970** Must be called exactly once before pci_init().
1971*/
1972void __init sba_init(void)
1973{
1974 register_parisc_driver(&sba_driver);
1975}
1976
1977
1978/**
1979 * sba_get_iommu - Assign the iommu pointer for the pci bus controller.
1980 * @dev: The parisc device.
1981 *
1982 * Returns the appropriate IOMMU data for the given parisc PCI controller.
1983 * This is cached and used later for PCI DMA Mapping.
1984 */
1985void * sba_get_iommu(struct parisc_device *pci_hba)
1986{
1987 struct parisc_device *sba_dev = parisc_parent(pci_hba);
1988 struct sba_device *sba = sba_dev->dev.driver_data;
1989 char t = sba_dev->id.hw_type;
1990 int iocnum = (pci_hba->hw_path >> 3); /* rope # */
1991
1992 WARN_ON((t != HPHW_IOA) && (t != HPHW_BCPORT));
1993
1994 return &(sba->ioc[iocnum]);
1995}
1996
1997
1998/**
1999 * sba_directed_lmmio - return first directed LMMIO range routed to rope
2000 * @pa_dev: The parisc device.
2001 * @r: resource PCI host controller wants start/end fields assigned.
2002 *
2003 * For the given parisc PCI controller, determine if any direct ranges
2004 * are routed down the corresponding rope.
2005 */
2006void sba_directed_lmmio(struct parisc_device *pci_hba, struct resource *r)
2007{
2008 struct parisc_device *sba_dev = parisc_parent(pci_hba);
2009 struct sba_device *sba = sba_dev->dev.driver_data;
2010 char t = sba_dev->id.hw_type;
2011 int i;
2012 int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1)); /* rope # */
2013
Eric Sesterhennb7494552006-03-24 18:52:10 +01002014 BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002015
2016 r->start = r->end = 0;
2017
2018 /* Astro has 4 directed ranges. Not sure about Ike/Pluto/et al */
2019 for (i=0; i<4; i++) {
2020 int base, size;
2021 void __iomem *reg = sba->sba_hpa + i*0x18;
2022
2023 base = READ_REG32(reg + LMMIO_DIRECT0_BASE);
2024 if ((base & 1) == 0)
2025 continue; /* not enabled */
2026
2027 size = READ_REG32(reg + LMMIO_DIRECT0_ROUTE);
2028
2029 if ((size & (ROPES_PER_IOC-1)) != rope)
2030 continue; /* directed down different rope */
2031
2032 r->start = (base & ~1UL) | PCI_F_EXTEND;
2033 size = ~ READ_REG32(reg + LMMIO_DIRECT0_MASK);
2034 r->end = r->start + size;
2035 }
2036}
2037
2038
2039/**
2040 * sba_distributed_lmmio - return portion of distributed LMMIO range
2041 * @pa_dev: The parisc device.
2042 * @r: resource PCI host controller wants start/end fields assigned.
2043 *
2044 * For the given parisc PCI controller, return portion of distributed LMMIO
2045 * range. The distributed LMMIO is always present and it's just a question
2046 * of the base address and size of the range.
2047 */
2048void sba_distributed_lmmio(struct parisc_device *pci_hba, struct resource *r )
2049{
2050 struct parisc_device *sba_dev = parisc_parent(pci_hba);
2051 struct sba_device *sba = sba_dev->dev.driver_data;
2052 char t = sba_dev->id.hw_type;
2053 int base, size;
2054 int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1)); /* rope # */
2055
Eric Sesterhennb7494552006-03-24 18:52:10 +01002056 BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002057
2058 r->start = r->end = 0;
2059
2060 base = READ_REG32(sba->sba_hpa + LMMIO_DIST_BASE);
2061 if ((base & 1) == 0) {
2062 BUG(); /* Gah! Distr Range wasn't enabled! */
2063 return;
2064 }
2065
2066 r->start = (base & ~1UL) | PCI_F_EXTEND;
2067
2068 size = (~READ_REG32(sba->sba_hpa + LMMIO_DIST_MASK)) / ROPES_PER_IOC;
2069 r->start += rope * (size + 1); /* adjust base for this rope */
2070 r->end = r->start + size;
2071}