1 /* 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 22 #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 #include <linux/scatterlist.h> 32 #include <linux/iommu-helper.h> 33 34 #include <asm/byteorder.h> 35 #include <asm/io.h> 36 #include <asm/dma.h> /* for DMA_CHUNK_SIZE */ 37 38 #include <asm/hardware.h> /* for register_parisc_driver() stuff */ 39 40 #include <linux/proc_fs.h> 41 #include <linux/seq_file.h> 42 43 #include <asm/ropes.h> 44 #include <asm/mckinley.h> /* for proc_mckinley_root */ 45 #include <asm/runway.h> /* for proc_runway_root */ 46 #include <asm/pdc.h> /* for PDC_MODEL_* */ 47 #include <asm/pdcpat.h> /* for is_pdc_pat() */ 48 #include <asm/parisc-device.h> 49 50 #define MODULE_NAME "SBA" 51 52 /* 53 ** The number of debug flags is a clue - this code is fragile. 54 ** Don't even think about messing with it unless you have 55 ** plenty of 710's to sacrifice to the computer gods. :^) 56 */ 57 #undef DEBUG_SBA_INIT 58 #undef DEBUG_SBA_RUN 59 #undef DEBUG_SBA_RUN_SG 60 #undef DEBUG_SBA_RESOURCE 61 #undef ASSERT_PDIR_SANITY 62 #undef DEBUG_LARGE_SG_ENTRIES 63 #undef DEBUG_DMB_TRAP 64 65 #ifdef DEBUG_SBA_INIT 66 #define DBG_INIT(x...) printk(x) 67 #else 68 #define DBG_INIT(x...) 69 #endif 70 71 #ifdef DEBUG_SBA_RUN 72 #define DBG_RUN(x...) printk(x) 73 #else 74 #define DBG_RUN(x...) 75 #endif 76 77 #ifdef DEBUG_SBA_RUN_SG 78 #define DBG_RUN_SG(x...) printk(x) 79 #else 80 #define DBG_RUN_SG(x...) 81 #endif 82 83 84 #ifdef DEBUG_SBA_RESOURCE 85 #define DBG_RES(x...) printk(x) 86 #else 87 #define DBG_RES(x...) 88 #endif 89 90 #define SBA_INLINE __inline__ 91 92 #define DEFAULT_DMA_HINT_REG 0 93 94 struct sba_device *sba_list; 95 EXPORT_SYMBOL_GPL(sba_list); 96 97 static unsigned long ioc_needs_fdc = 0; 98 99 /* global count of IOMMUs in the system */ 100 static unsigned int global_ioc_cnt = 0; 101 102 /* PA8700 (Piranha 2.2) bug workaround */ 103 static unsigned long piranha_bad_128k = 0; 104 105 /* Looks nice and keeps the compiler happy */ 106 #define SBA_DEV(d) ((struct sba_device *) (d)) 107 108 #ifdef CONFIG_AGP_PARISC 109 #define SBA_AGP_SUPPORT 110 #endif /*CONFIG_AGP_PARISC*/ 111 112 #ifdef SBA_AGP_SUPPORT 113 static int sba_reserve_agpgart = 1; 114 module_param(sba_reserve_agpgart, int, 0444); 115 MODULE_PARM_DESC(sba_reserve_agpgart, "Reserve half of IO pdir as AGPGART"); 116 #endif 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 */ 127 #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)) 131 132 #ifdef CONFIG_64BIT 133 #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 141 142 /* NOTE: When CONFIG_64BIT isn't defined, READ_REG64() is two 32-bit reads */ 143 144 /** 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 */ 151 static void 152 sba_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 */ 170 static 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) 182 #endif /* DEBUG_SBA_INIT */ 183 184 185 #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 */ 195 static void 196 sba_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 */ 227 static int 228 sba_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 */ 271 static void 272 sba_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 static unsigned long ptr_to_pide(struct ioc *ioc, unsigned long *res_ptr, 318 unsigned int bitshiftcnt) 319 { 320 return (((unsigned long)res_ptr - (unsigned long)ioc->res_map) << 3) 321 + bitshiftcnt; 322 } 323 324 /** 325 * sba_search_bitmap - find free space in IO PDIR resource bitmap 326 * @ioc: IO MMU structure which owns the pdir we are interested in. 327 * @bits_wanted: number of entries we need. 328 * 329 * Find consecutive free bits in resource bitmap. 330 * Each bit represents one entry in the IO Pdir. 331 * Cool perf optimization: search for log2(size) bits at a time. 332 */ 333 static SBA_INLINE unsigned long 334 sba_search_bitmap(struct ioc *ioc, struct device *dev, 335 unsigned long bits_wanted) 336 { 337 unsigned long *res_ptr = ioc->res_hint; 338 unsigned long *res_end = (unsigned long *) &(ioc->res_map[ioc->res_size]); 339 unsigned long pide = ~0UL, tpide; 340 unsigned long boundary_size; 341 unsigned long shift; 342 int ret; 343 344 boundary_size = ALIGN((unsigned long long)dma_get_seg_boundary(dev) + 1, 345 1ULL << IOVP_SHIFT) >> IOVP_SHIFT; 346 347 #if defined(ZX1_SUPPORT) 348 BUG_ON(ioc->ibase & ~IOVP_MASK); 349 shift = ioc->ibase >> IOVP_SHIFT; 350 #else 351 shift = 0; 352 #endif 353 354 if (bits_wanted > (BITS_PER_LONG/2)) { 355 /* Search word at a time - no mask needed */ 356 for(; res_ptr < res_end; ++res_ptr) { 357 tpide = ptr_to_pide(ioc, res_ptr, 0); 358 ret = iommu_is_span_boundary(tpide, bits_wanted, 359 shift, 360 boundary_size); 361 if ((*res_ptr == 0) && !ret) { 362 *res_ptr = RESMAP_MASK(bits_wanted); 363 pide = tpide; 364 break; 365 } 366 } 367 /* point to the next word on next pass */ 368 res_ptr++; 369 ioc->res_bitshift = 0; 370 } else { 371 /* 372 ** Search the resource bit map on well-aligned values. 373 ** "o" is the alignment. 374 ** We need the alignment to invalidate I/O TLB using 375 ** SBA HW features in the unmap path. 376 */ 377 unsigned long o = 1 << get_order(bits_wanted << PAGE_SHIFT); 378 uint bitshiftcnt = ALIGN(ioc->res_bitshift, o); 379 unsigned long mask; 380 381 if (bitshiftcnt >= BITS_PER_LONG) { 382 bitshiftcnt = 0; 383 res_ptr++; 384 } 385 mask = RESMAP_MASK(bits_wanted) >> bitshiftcnt; 386 387 DBG_RES("%s() o %ld %p", __func__, o, res_ptr); 388 while(res_ptr < res_end) 389 { 390 DBG_RES(" %p %lx %lx\n", res_ptr, mask, *res_ptr); 391 WARN_ON(mask == 0); 392 tpide = ptr_to_pide(ioc, res_ptr, bitshiftcnt); 393 ret = iommu_is_span_boundary(tpide, bits_wanted, 394 shift, 395 boundary_size); 396 if ((((*res_ptr) & mask) == 0) && !ret) { 397 *res_ptr |= mask; /* mark resources busy! */ 398 pide = tpide; 399 break; 400 } 401 mask >>= o; 402 bitshiftcnt += o; 403 if (mask == 0) { 404 mask = RESMAP_MASK(bits_wanted); 405 bitshiftcnt=0; 406 res_ptr++; 407 } 408 } 409 /* look in the same word on the next pass */ 410 ioc->res_bitshift = bitshiftcnt + bits_wanted; 411 } 412 413 /* wrapped ? */ 414 if (res_end <= res_ptr) { 415 ioc->res_hint = (unsigned long *) ioc->res_map; 416 ioc->res_bitshift = 0; 417 } else { 418 ioc->res_hint = res_ptr; 419 } 420 return (pide); 421 } 422 423 424 /** 425 * sba_alloc_range - find free bits and mark them in IO PDIR resource bitmap 426 * @ioc: IO MMU structure which owns the pdir we are interested in. 427 * @size: number of bytes to create a mapping for 428 * 429 * Given a size, find consecutive unmarked and then mark those bits in the 430 * resource bit map. 431 */ 432 static int 433 sba_alloc_range(struct ioc *ioc, struct device *dev, size_t size) 434 { 435 unsigned int pages_needed = size >> IOVP_SHIFT; 436 #ifdef SBA_COLLECT_STATS 437 unsigned long cr_start = mfctl(16); 438 #endif 439 unsigned long pide; 440 441 pide = sba_search_bitmap(ioc, dev, pages_needed); 442 if (pide >= (ioc->res_size << 3)) { 443 pide = sba_search_bitmap(ioc, dev, pages_needed); 444 if (pide >= (ioc->res_size << 3)) 445 panic("%s: I/O MMU @ %p is out of mapping resources\n", 446 __FILE__, ioc->ioc_hpa); 447 } 448 449 #ifdef ASSERT_PDIR_SANITY 450 /* verify the first enable bit is clear */ 451 if(0x00 != ((u8 *) ioc->pdir_base)[pide*sizeof(u64) + 7]) { 452 sba_dump_pdir_entry(ioc, "sba_search_bitmap() botched it?", pide); 453 } 454 #endif 455 456 DBG_RES("%s(%x) %d -> %lx hint %x/%x\n", 457 __func__, size, pages_needed, pide, 458 (uint) ((unsigned long) ioc->res_hint - (unsigned long) ioc->res_map), 459 ioc->res_bitshift ); 460 461 #ifdef SBA_COLLECT_STATS 462 { 463 unsigned long cr_end = mfctl(16); 464 unsigned long tmp = cr_end - cr_start; 465 /* check for roll over */ 466 cr_start = (cr_end < cr_start) ? -(tmp) : (tmp); 467 } 468 ioc->avg_search[ioc->avg_idx++] = cr_start; 469 ioc->avg_idx &= SBA_SEARCH_SAMPLE - 1; 470 471 ioc->used_pages += pages_needed; 472 #endif 473 474 return (pide); 475 } 476 477 478 /** 479 * sba_free_range - unmark bits in IO PDIR resource bitmap 480 * @ioc: IO MMU structure which owns the pdir we are interested in. 481 * @iova: IO virtual address which was previously allocated. 482 * @size: number of bytes to create a mapping for 483 * 484 * clear bits in the ioc's resource map 485 */ 486 static SBA_INLINE void 487 sba_free_range(struct ioc *ioc, dma_addr_t iova, size_t size) 488 { 489 unsigned long iovp = SBA_IOVP(ioc, iova); 490 unsigned int pide = PDIR_INDEX(iovp); 491 unsigned int ridx = pide >> 3; /* convert bit to byte address */ 492 unsigned long *res_ptr = (unsigned long *) &((ioc)->res_map[ridx & ~RESMAP_IDX_MASK]); 493 494 int bits_not_wanted = size >> IOVP_SHIFT; 495 496 /* 3-bits "bit" address plus 2 (or 3) bits for "byte" == bit in word */ 497 unsigned long m = RESMAP_MASK(bits_not_wanted) >> (pide & (BITS_PER_LONG - 1)); 498 499 DBG_RES("%s( ,%x,%x) %x/%lx %x %p %lx\n", 500 __func__, (uint) iova, size, 501 bits_not_wanted, m, pide, res_ptr, *res_ptr); 502 503 #ifdef SBA_COLLECT_STATS 504 ioc->used_pages -= bits_not_wanted; 505 #endif 506 507 *res_ptr &= ~m; 508 } 509 510 511 /************************************************************** 512 * 513 * "Dynamic DMA Mapping" support (aka "Coherent I/O") 514 * 515 ***************************************************************/ 516 517 #ifdef SBA_HINT_SUPPORT 518 #define SBA_DMA_HINT(ioc, val) ((val) << (ioc)->hint_shift_pdir) 519 #endif 520 521 typedef unsigned long space_t; 522 #define KERNEL_SPACE 0 523 524 /** 525 * sba_io_pdir_entry - fill in one IO PDIR entry 526 * @pdir_ptr: pointer to IO PDIR entry 527 * @sid: process Space ID - currently only support KERNEL_SPACE 528 * @vba: Virtual CPU address of buffer to map 529 * @hint: DMA hint set to use for this mapping 530 * 531 * SBA Mapping Routine 532 * 533 * Given a virtual address (vba, arg2) and space id, (sid, arg1) 534 * sba_io_pdir_entry() loads the I/O PDIR entry pointed to by 535 * pdir_ptr (arg0). 536 * Using the bass-ackwards HP bit numbering, Each IO Pdir entry 537 * for Astro/Ike looks like: 538 * 539 * 540 * 0 19 51 55 63 541 * +-+---------------------+----------------------------------+----+--------+ 542 * |V| U | PPN[43:12] | U | VI | 543 * +-+---------------------+----------------------------------+----+--------+ 544 * 545 * Pluto is basically identical, supports fewer physical address bits: 546 * 547 * 0 23 51 55 63 548 * +-+------------------------+-------------------------------+----+--------+ 549 * |V| U | PPN[39:12] | U | VI | 550 * +-+------------------------+-------------------------------+----+--------+ 551 * 552 * V == Valid Bit (Most Significant Bit is bit 0) 553 * U == Unused 554 * PPN == Physical Page Number 555 * VI == Virtual Index (aka Coherent Index) 556 * 557 * LPA instruction output is put into PPN field. 558 * LCI (Load Coherence Index) instruction provides the "VI" bits. 559 * 560 * We pre-swap the bytes since PCX-W is Big Endian and the 561 * IOMMU uses little endian for the pdir. 562 */ 563 564 static void SBA_INLINE 565 sba_io_pdir_entry(u64 *pdir_ptr, space_t sid, unsigned long vba, 566 unsigned long hint) 567 { 568 u64 pa; /* physical address */ 569 register unsigned ci; /* coherent index */ 570 571 pa = virt_to_phys(vba); 572 pa &= IOVP_MASK; 573 574 mtsp(sid,1); 575 asm("lci 0(%%sr1, %1), %0" : "=r" (ci) : "r" (vba)); 576 pa |= (ci >> 12) & 0xff; /* move CI (8 bits) into lowest byte */ 577 578 pa |= SBA_PDIR_VALID_BIT; /* set "valid" bit */ 579 *pdir_ptr = cpu_to_le64(pa); /* swap and store into I/O Pdir */ 580 581 /* 582 * If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set 583 * (bit #61, big endian), we have to flush and sync every time 584 * IO-PDIR is changed in Ike/Astro. 585 */ 586 if (ioc_needs_fdc) 587 asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr)); 588 } 589 590 591 /** 592 * sba_mark_invalid - invalidate one or more IO PDIR entries 593 * @ioc: IO MMU structure which owns the pdir we are interested in. 594 * @iova: IO Virtual Address mapped earlier 595 * @byte_cnt: number of bytes this mapping covers. 596 * 597 * Marking the IO PDIR entry(ies) as Invalid and invalidate 598 * corresponding IO TLB entry. The Ike PCOM (Purge Command Register) 599 * is to purge stale entries in the IO TLB when unmapping entries. 600 * 601 * The PCOM register supports purging of multiple pages, with a minium 602 * of 1 page and a maximum of 2GB. Hardware requires the address be 603 * aligned to the size of the range being purged. The size of the range 604 * must be a power of 2. The "Cool perf optimization" in the 605 * allocation routine helps keep that true. 606 */ 607 static SBA_INLINE void 608 sba_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt) 609 { 610 u32 iovp = (u32) SBA_IOVP(ioc,iova); 611 u64 *pdir_ptr = &ioc->pdir_base[PDIR_INDEX(iovp)]; 612 613 #ifdef ASSERT_PDIR_SANITY 614 /* Assert first pdir entry is set. 615 ** 616 ** Even though this is a big-endian machine, the entries 617 ** in the iopdir are little endian. That's why we look at 618 ** the byte at +7 instead of at +0. 619 */ 620 if (0x80 != (((u8 *) pdir_ptr)[7])) { 621 sba_dump_pdir_entry(ioc,"sba_mark_invalid()", PDIR_INDEX(iovp)); 622 } 623 #endif 624 625 if (byte_cnt > IOVP_SIZE) 626 { 627 #if 0 628 unsigned long entries_per_cacheline = ioc_needs_fdc ? 629 L1_CACHE_ALIGN(((unsigned long) pdir_ptr)) 630 - (unsigned long) pdir_ptr; 631 : 262144; 632 #endif 633 634 /* set "size" field for PCOM */ 635 iovp |= get_order(byte_cnt) + PAGE_SHIFT; 636 637 do { 638 /* clear I/O Pdir entry "valid" bit first */ 639 ((u8 *) pdir_ptr)[7] = 0; 640 if (ioc_needs_fdc) { 641 asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr)); 642 #if 0 643 entries_per_cacheline = L1_CACHE_SHIFT - 3; 644 #endif 645 } 646 pdir_ptr++; 647 byte_cnt -= IOVP_SIZE; 648 } while (byte_cnt > IOVP_SIZE); 649 } else 650 iovp |= IOVP_SHIFT; /* set "size" field for PCOM */ 651 652 /* 653 ** clear I/O PDIR entry "valid" bit. 654 ** We have to R/M/W the cacheline regardless how much of the 655 ** pdir entry that we clobber. 656 ** The rest of the entry would be useful for debugging if we 657 ** could dump core on HPMC. 658 */ 659 ((u8 *) pdir_ptr)[7] = 0; 660 if (ioc_needs_fdc) 661 asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr)); 662 663 WRITE_REG( SBA_IOVA(ioc, iovp, 0, 0), ioc->ioc_hpa+IOC_PCOM); 664 } 665 666 /** 667 * sba_dma_supported - PCI driver can query DMA support 668 * @dev: instance of PCI owned by the driver that's asking 669 * @mask: number of address bits this PCI device can handle 670 * 671 * See Documentation/PCI/PCI-DMA-mapping.txt 672 */ 673 static int sba_dma_supported( struct device *dev, u64 mask) 674 { 675 struct ioc *ioc; 676 677 if (dev == NULL) { 678 printk(KERN_ERR MODULE_NAME ": EISA/ISA/et al not supported\n"); 679 BUG(); 680 return(0); 681 } 682 683 /* Documentation/PCI/PCI-DMA-mapping.txt tells drivers to try 64-bit 684 * first, then fall back to 32-bit if that fails. 685 * We are just "encouraging" 32-bit DMA masks here since we can 686 * never allow IOMMU bypass unless we add special support for ZX1. 687 */ 688 if (mask > ~0U) 689 return 0; 690 691 ioc = GET_IOC(dev); 692 693 /* 694 * check if mask is >= than the current max IO Virt Address 695 * The max IO Virt address will *always* < 30 bits. 696 */ 697 return((int)(mask >= (ioc->ibase - 1 + 698 (ioc->pdir_size / sizeof(u64) * IOVP_SIZE) ))); 699 } 700 701 702 /** 703 * sba_map_single - map one buffer and return IOVA for DMA 704 * @dev: instance of PCI owned by the driver that's asking. 705 * @addr: driver buffer to map. 706 * @size: number of bytes to map in driver buffer. 707 * @direction: R/W or both. 708 * 709 * See Documentation/PCI/PCI-DMA-mapping.txt 710 */ 711 static dma_addr_t 712 sba_map_single(struct device *dev, void *addr, size_t size, 713 enum dma_data_direction direction) 714 { 715 struct ioc *ioc; 716 unsigned long flags; 717 dma_addr_t iovp; 718 dma_addr_t offset; 719 u64 *pdir_start; 720 int pide; 721 722 ioc = GET_IOC(dev); 723 724 /* save offset bits */ 725 offset = ((dma_addr_t) (long) addr) & ~IOVP_MASK; 726 727 /* round up to nearest IOVP_SIZE */ 728 size = (size + offset + ~IOVP_MASK) & IOVP_MASK; 729 730 spin_lock_irqsave(&ioc->res_lock, flags); 731 #ifdef ASSERT_PDIR_SANITY 732 sba_check_pdir(ioc,"Check before sba_map_single()"); 733 #endif 734 735 #ifdef SBA_COLLECT_STATS 736 ioc->msingle_calls++; 737 ioc->msingle_pages += size >> IOVP_SHIFT; 738 #endif 739 pide = sba_alloc_range(ioc, dev, size); 740 iovp = (dma_addr_t) pide << IOVP_SHIFT; 741 742 DBG_RUN("%s() 0x%p -> 0x%lx\n", 743 __func__, addr, (long) iovp | offset); 744 745 pdir_start = &(ioc->pdir_base[pide]); 746 747 while (size > 0) { 748 sba_io_pdir_entry(pdir_start, KERNEL_SPACE, (unsigned long) addr, 0); 749 750 DBG_RUN(" pdir 0x%p %02x%02x%02x%02x%02x%02x%02x%02x\n", 751 pdir_start, 752 (u8) (((u8 *) pdir_start)[7]), 753 (u8) (((u8 *) pdir_start)[6]), 754 (u8) (((u8 *) pdir_start)[5]), 755 (u8) (((u8 *) pdir_start)[4]), 756 (u8) (((u8 *) pdir_start)[3]), 757 (u8) (((u8 *) pdir_start)[2]), 758 (u8) (((u8 *) pdir_start)[1]), 759 (u8) (((u8 *) pdir_start)[0]) 760 ); 761 762 addr += IOVP_SIZE; 763 size -= IOVP_SIZE; 764 pdir_start++; 765 } 766 767 /* force FDC ops in io_pdir_entry() to be visible to IOMMU */ 768 if (ioc_needs_fdc) 769 asm volatile("sync" : : ); 770 771 #ifdef ASSERT_PDIR_SANITY 772 sba_check_pdir(ioc,"Check after sba_map_single()"); 773 #endif 774 spin_unlock_irqrestore(&ioc->res_lock, flags); 775 776 /* form complete address */ 777 return SBA_IOVA(ioc, iovp, offset, DEFAULT_DMA_HINT_REG); 778 } 779 780 781 /** 782 * sba_unmap_single - unmap one IOVA and free resources 783 * @dev: instance of PCI owned by the driver that's asking. 784 * @iova: IOVA of driver buffer previously mapped. 785 * @size: number of bytes mapped in driver buffer. 786 * @direction: R/W or both. 787 * 788 * See Documentation/PCI/PCI-DMA-mapping.txt 789 */ 790 static void 791 sba_unmap_single(struct device *dev, dma_addr_t iova, size_t size, 792 enum dma_data_direction direction) 793 { 794 struct ioc *ioc; 795 #if DELAYED_RESOURCE_CNT > 0 796 struct sba_dma_pair *d; 797 #endif 798 unsigned long flags; 799 dma_addr_t offset; 800 801 DBG_RUN("%s() iovp 0x%lx/%x\n", __func__, (long) iova, size); 802 803 ioc = GET_IOC(dev); 804 offset = iova & ~IOVP_MASK; 805 iova ^= offset; /* clear offset bits */ 806 size += offset; 807 size = ALIGN(size, IOVP_SIZE); 808 809 spin_lock_irqsave(&ioc->res_lock, flags); 810 811 #ifdef SBA_COLLECT_STATS 812 ioc->usingle_calls++; 813 ioc->usingle_pages += size >> IOVP_SHIFT; 814 #endif 815 816 sba_mark_invalid(ioc, iova, size); 817 818 #if DELAYED_RESOURCE_CNT > 0 819 /* Delaying when we re-use a IO Pdir entry reduces the number 820 * of MMIO reads needed to flush writes to the PCOM register. 821 */ 822 d = &(ioc->saved[ioc->saved_cnt]); 823 d->iova = iova; 824 d->size = size; 825 if (++(ioc->saved_cnt) >= DELAYED_RESOURCE_CNT) { 826 int cnt = ioc->saved_cnt; 827 while (cnt--) { 828 sba_free_range(ioc, d->iova, d->size); 829 d--; 830 } 831 ioc->saved_cnt = 0; 832 833 READ_REG(ioc->ioc_hpa+IOC_PCOM); /* flush purges */ 834 } 835 #else /* DELAYED_RESOURCE_CNT == 0 */ 836 sba_free_range(ioc, iova, size); 837 838 /* If fdc's were issued, force fdc's to be visible now */ 839 if (ioc_needs_fdc) 840 asm volatile("sync" : : ); 841 842 READ_REG(ioc->ioc_hpa+IOC_PCOM); /* flush purges */ 843 #endif /* DELAYED_RESOURCE_CNT == 0 */ 844 845 spin_unlock_irqrestore(&ioc->res_lock, flags); 846 847 /* XXX REVISIT for 2.5 Linux - need syncdma for zero-copy support. 848 ** For Astro based systems this isn't a big deal WRT performance. 849 ** As long as 2.4 kernels copyin/copyout data from/to userspace, 850 ** we don't need the syncdma. The issue here is I/O MMU cachelines 851 ** are *not* coherent in all cases. May be hwrev dependent. 852 ** Need to investigate more. 853 asm volatile("syncdma"); 854 */ 855 } 856 857 858 /** 859 * sba_alloc_consistent - allocate/map shared mem for DMA 860 * @hwdev: instance of PCI owned by the driver that's asking. 861 * @size: number of bytes mapped in driver buffer. 862 * @dma_handle: IOVA of new buffer. 863 * 864 * See Documentation/PCI/PCI-DMA-mapping.txt 865 */ 866 static void *sba_alloc_consistent(struct device *hwdev, size_t size, 867 dma_addr_t *dma_handle, gfp_t gfp) 868 { 869 void *ret; 870 871 if (!hwdev) { 872 /* only support PCI */ 873 *dma_handle = 0; 874 return NULL; 875 } 876 877 ret = (void *) __get_free_pages(gfp, get_order(size)); 878 879 if (ret) { 880 memset(ret, 0, size); 881 *dma_handle = sba_map_single(hwdev, ret, size, 0); 882 } 883 884 return ret; 885 } 886 887 888 /** 889 * sba_free_consistent - free/unmap shared mem for DMA 890 * @hwdev: instance of PCI owned by the driver that's asking. 891 * @size: number of bytes mapped in driver buffer. 892 * @vaddr: virtual address IOVA of "consistent" buffer. 893 * @dma_handler: IO virtual address of "consistent" buffer. 894 * 895 * See Documentation/PCI/PCI-DMA-mapping.txt 896 */ 897 static void 898 sba_free_consistent(struct device *hwdev, size_t size, void *vaddr, 899 dma_addr_t dma_handle) 900 { 901 sba_unmap_single(hwdev, dma_handle, size, 0); 902 free_pages((unsigned long) vaddr, get_order(size)); 903 } 904 905 906 /* 907 ** Since 0 is a valid pdir_base index value, can't use that 908 ** to determine if a value is valid or not. Use a flag to indicate 909 ** the SG list entry contains a valid pdir index. 910 */ 911 #define PIDE_FLAG 0x80000000UL 912 913 #ifdef SBA_COLLECT_STATS 914 #define IOMMU_MAP_STATS 915 #endif 916 #include "iommu-helpers.h" 917 918 #ifdef DEBUG_LARGE_SG_ENTRIES 919 int dump_run_sg = 0; 920 #endif 921 922 923 /** 924 * sba_map_sg - map Scatter/Gather list 925 * @dev: instance of PCI owned by the driver that's asking. 926 * @sglist: array of buffer/length pairs 927 * @nents: number of entries in list 928 * @direction: R/W or both. 929 * 930 * See Documentation/PCI/PCI-DMA-mapping.txt 931 */ 932 static int 933 sba_map_sg(struct device *dev, struct scatterlist *sglist, int nents, 934 enum dma_data_direction direction) 935 { 936 struct ioc *ioc; 937 int coalesced, filled = 0; 938 unsigned long flags; 939 940 DBG_RUN_SG("%s() START %d entries\n", __func__, nents); 941 942 ioc = GET_IOC(dev); 943 944 /* Fast path single entry scatterlists. */ 945 if (nents == 1) { 946 sg_dma_address(sglist) = sba_map_single(dev, 947 (void *)sg_virt_addr(sglist), 948 sglist->length, direction); 949 sg_dma_len(sglist) = sglist->length; 950 return 1; 951 } 952 953 spin_lock_irqsave(&ioc->res_lock, flags); 954 955 #ifdef ASSERT_PDIR_SANITY 956 if (sba_check_pdir(ioc,"Check before sba_map_sg()")) 957 { 958 sba_dump_sg(ioc, sglist, nents); 959 panic("Check before sba_map_sg()"); 960 } 961 #endif 962 963 #ifdef SBA_COLLECT_STATS 964 ioc->msg_calls++; 965 #endif 966 967 /* 968 ** First coalesce the chunks and allocate I/O pdir space 969 ** 970 ** If this is one DMA stream, we can properly map using the 971 ** correct virtual address associated with each DMA page. 972 ** w/o this association, we wouldn't have coherent DMA! 973 ** Access to the virtual address is what forces a two pass algorithm. 974 */ 975 coalesced = iommu_coalesce_chunks(ioc, dev, sglist, nents, sba_alloc_range); 976 977 /* 978 ** Program the I/O Pdir 979 ** 980 ** map the virtual addresses to the I/O Pdir 981 ** o dma_address will contain the pdir index 982 ** o dma_len will contain the number of bytes to map 983 ** o address contains the virtual address. 984 */ 985 filled = iommu_fill_pdir(ioc, sglist, nents, 0, sba_io_pdir_entry); 986 987 /* force FDC ops in io_pdir_entry() to be visible to IOMMU */ 988 if (ioc_needs_fdc) 989 asm volatile("sync" : : ); 990 991 #ifdef ASSERT_PDIR_SANITY 992 if (sba_check_pdir(ioc,"Check after sba_map_sg()")) 993 { 994 sba_dump_sg(ioc, sglist, nents); 995 panic("Check after sba_map_sg()\n"); 996 } 997 #endif 998 999 spin_unlock_irqrestore(&ioc->res_lock, flags); 1000 1001 DBG_RUN_SG("%s() DONE %d mappings\n", __func__, filled); 1002 1003 return filled; 1004 } 1005 1006 1007 /** 1008 * sba_unmap_sg - unmap Scatter/Gather list 1009 * @dev: instance of PCI owned by the driver that's asking. 1010 * @sglist: array of buffer/length pairs 1011 * @nents: number of entries in list 1012 * @direction: R/W or both. 1013 * 1014 * See Documentation/PCI/PCI-DMA-mapping.txt 1015 */ 1016 static void 1017 sba_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents, 1018 enum dma_data_direction direction) 1019 { 1020 struct ioc *ioc; 1021 #ifdef ASSERT_PDIR_SANITY 1022 unsigned long flags; 1023 #endif 1024 1025 DBG_RUN_SG("%s() START %d entries, %p,%x\n", 1026 __func__, nents, sg_virt_addr(sglist), sglist->length); 1027 1028 ioc = GET_IOC(dev); 1029 1030 #ifdef SBA_COLLECT_STATS 1031 ioc->usg_calls++; 1032 #endif 1033 1034 #ifdef ASSERT_PDIR_SANITY 1035 spin_lock_irqsave(&ioc->res_lock, flags); 1036 sba_check_pdir(ioc,"Check before sba_unmap_sg()"); 1037 spin_unlock_irqrestore(&ioc->res_lock, flags); 1038 #endif 1039 1040 while (sg_dma_len(sglist) && nents--) { 1041 1042 sba_unmap_single(dev, sg_dma_address(sglist), sg_dma_len(sglist), direction); 1043 #ifdef SBA_COLLECT_STATS 1044 ioc->usg_pages += ((sg_dma_address(sglist) & ~IOVP_MASK) + sg_dma_len(sglist) + IOVP_SIZE - 1) >> PAGE_SHIFT; 1045 ioc->usingle_calls--; /* kluge since call is unmap_sg() */ 1046 #endif 1047 ++sglist; 1048 } 1049 1050 DBG_RUN_SG("%s() DONE (nents %d)\n", __func__, nents); 1051 1052 #ifdef ASSERT_PDIR_SANITY 1053 spin_lock_irqsave(&ioc->res_lock, flags); 1054 sba_check_pdir(ioc,"Check after sba_unmap_sg()"); 1055 spin_unlock_irqrestore(&ioc->res_lock, flags); 1056 #endif 1057 1058 } 1059 1060 static struct hppa_dma_ops sba_ops = { 1061 .dma_supported = sba_dma_supported, 1062 .alloc_consistent = sba_alloc_consistent, 1063 .alloc_noncoherent = sba_alloc_consistent, 1064 .free_consistent = sba_free_consistent, 1065 .map_single = sba_map_single, 1066 .unmap_single = sba_unmap_single, 1067 .map_sg = sba_map_sg, 1068 .unmap_sg = sba_unmap_sg, 1069 .dma_sync_single_for_cpu = NULL, 1070 .dma_sync_single_for_device = NULL, 1071 .dma_sync_sg_for_cpu = NULL, 1072 .dma_sync_sg_for_device = NULL, 1073 }; 1074 1075 1076 /************************************************************************** 1077 ** 1078 ** SBA PAT PDC support 1079 ** 1080 ** o call pdc_pat_cell_module() 1081 ** o store ranges in PCI "resource" structures 1082 ** 1083 **************************************************************************/ 1084 1085 static void 1086 sba_get_pat_resources(struct sba_device *sba_dev) 1087 { 1088 #if 0 1089 /* 1090 ** TODO/REVISIT/FIXME: support for directed ranges requires calls to 1091 ** PAT PDC to program the SBA/LBA directed range registers...this 1092 ** burden may fall on the LBA code since it directly supports the 1093 ** PCI subsystem. It's not clear yet. - ggg 1094 */ 1095 PAT_MOD(mod)->mod_info.mod_pages = PAT_GET_MOD_PAGES(temp); 1096 FIXME : ??? 1097 PAT_MOD(mod)->mod_info.dvi = PAT_GET_DVI(temp); 1098 Tells where the dvi bits are located in the address. 1099 PAT_MOD(mod)->mod_info.ioc = PAT_GET_IOC(temp); 1100 FIXME : ??? 1101 #endif 1102 } 1103 1104 1105 /************************************************************** 1106 * 1107 * Initialization and claim 1108 * 1109 ***************************************************************/ 1110 #define PIRANHA_ADDR_MASK 0x00160000UL /* bit 17,18,20 */ 1111 #define PIRANHA_ADDR_VAL 0x00060000UL /* bit 17,18 on */ 1112 static void * 1113 sba_alloc_pdir(unsigned int pdir_size) 1114 { 1115 unsigned long pdir_base; 1116 unsigned long pdir_order = get_order(pdir_size); 1117 1118 pdir_base = __get_free_pages(GFP_KERNEL, pdir_order); 1119 if (NULL == (void *) pdir_base) { 1120 panic("%s() could not allocate I/O Page Table\n", 1121 __func__); 1122 } 1123 1124 /* If this is not PA8700 (PCX-W2) 1125 ** OR newer than ver 2.2 1126 ** OR in a system that doesn't need VINDEX bits from SBA, 1127 ** 1128 ** then we aren't exposed to the HW bug. 1129 */ 1130 if ( ((boot_cpu_data.pdc.cpuid >> 5) & 0x7f) != 0x13 1131 || (boot_cpu_data.pdc.versions > 0x202) 1132 || (boot_cpu_data.pdc.capabilities & 0x08L) ) 1133 return (void *) pdir_base; 1134 1135 /* 1136 * PA8700 (PCX-W2, aka piranha) silent data corruption fix 1137 * 1138 * An interaction between PA8700 CPU (Ver 2.2 or older) and 1139 * Ike/Astro can cause silent data corruption. This is only 1140 * a problem if the I/O PDIR is located in memory such that 1141 * (little-endian) bits 17 and 18 are on and bit 20 is off. 1142 * 1143 * Since the max IO Pdir size is 2MB, by cleverly allocating the 1144 * right physical address, we can either avoid (IOPDIR <= 1MB) 1145 * or minimize (2MB IO Pdir) the problem if we restrict the 1146 * IO Pdir to a maximum size of 2MB-128K (1902K). 1147 * 1148 * Because we always allocate 2^N sized IO pdirs, either of the 1149 * "bad" regions will be the last 128K if at all. That's easy 1150 * to test for. 1151 * 1152 */ 1153 if (pdir_order <= (19-12)) { 1154 if (((virt_to_phys(pdir_base)+pdir_size-1) & PIRANHA_ADDR_MASK) == PIRANHA_ADDR_VAL) { 1155 /* allocate a new one on 512k alignment */ 1156 unsigned long new_pdir = __get_free_pages(GFP_KERNEL, (19-12)); 1157 /* release original */ 1158 free_pages(pdir_base, pdir_order); 1159 1160 pdir_base = new_pdir; 1161 1162 /* release excess */ 1163 while (pdir_order < (19-12)) { 1164 new_pdir += pdir_size; 1165 free_pages(new_pdir, pdir_order); 1166 pdir_order +=1; 1167 pdir_size <<=1; 1168 } 1169 } 1170 } else { 1171 /* 1172 ** 1MB or 2MB Pdir 1173 ** Needs to be aligned on an "odd" 1MB boundary. 1174 */ 1175 unsigned long new_pdir = __get_free_pages(GFP_KERNEL, pdir_order+1); /* 2 or 4MB */ 1176 1177 /* release original */ 1178 free_pages( pdir_base, pdir_order); 1179 1180 /* release first 1MB */ 1181 free_pages(new_pdir, 20-12); 1182 1183 pdir_base = new_pdir + 1024*1024; 1184 1185 if (pdir_order > (20-12)) { 1186 /* 1187 ** 2MB Pdir. 1188 ** 1189 ** Flag tells init_bitmap() to mark bad 128k as used 1190 ** and to reduce the size by 128k. 1191 */ 1192 piranha_bad_128k = 1; 1193 1194 new_pdir += 3*1024*1024; 1195 /* release last 1MB */ 1196 free_pages(new_pdir, 20-12); 1197 1198 /* release unusable 128KB */ 1199 free_pages(new_pdir - 128*1024 , 17-12); 1200 1201 pdir_size -= 128*1024; 1202 } 1203 } 1204 1205 memset((void *) pdir_base, 0, pdir_size); 1206 return (void *) pdir_base; 1207 } 1208 1209 struct ibase_data_struct { 1210 struct ioc *ioc; 1211 int ioc_num; 1212 }; 1213 1214 static int setup_ibase_imask_callback(struct device *dev, void *data) 1215 { 1216 /* lba_set_iregs() is in drivers/parisc/lba_pci.c */ 1217 extern void lba_set_iregs(struct parisc_device *, u32, u32); 1218 struct parisc_device *lba = to_parisc_device(dev); 1219 struct ibase_data_struct *ibd = data; 1220 int rope_num = (lba->hpa.start >> 13) & 0xf; 1221 if (rope_num >> 3 == ibd->ioc_num) 1222 lba_set_iregs(lba, ibd->ioc->ibase, ibd->ioc->imask); 1223 return 0; 1224 } 1225 1226 /* setup Mercury or Elroy IBASE/IMASK registers. */ 1227 static void 1228 setup_ibase_imask(struct parisc_device *sba, struct ioc *ioc, int ioc_num) 1229 { 1230 struct ibase_data_struct ibase_data = { 1231 .ioc = ioc, 1232 .ioc_num = ioc_num, 1233 }; 1234 1235 device_for_each_child(&sba->dev, &ibase_data, 1236 setup_ibase_imask_callback); 1237 } 1238 1239 #ifdef SBA_AGP_SUPPORT 1240 static int 1241 sba_ioc_find_quicksilver(struct device *dev, void *data) 1242 { 1243 int *agp_found = data; 1244 struct parisc_device *lba = to_parisc_device(dev); 1245 1246 if (IS_QUICKSILVER(lba)) 1247 *agp_found = 1; 1248 return 0; 1249 } 1250 #endif 1251 1252 static void 1253 sba_ioc_init_pluto(struct parisc_device *sba, struct ioc *ioc, int ioc_num) 1254 { 1255 u32 iova_space_mask; 1256 u32 iova_space_size; 1257 int iov_order, tcnfg; 1258 #ifdef SBA_AGP_SUPPORT 1259 int agp_found = 0; 1260 #endif 1261 /* 1262 ** Firmware programs the base and size of a "safe IOVA space" 1263 ** (one that doesn't overlap memory or LMMIO space) in the 1264 ** IBASE and IMASK registers. 1265 */ 1266 ioc->ibase = READ_REG(ioc->ioc_hpa + IOC_IBASE); 1267 iova_space_size = ~(READ_REG(ioc->ioc_hpa + IOC_IMASK) & 0xFFFFFFFFUL) + 1; 1268 1269 if ((ioc->ibase < 0xfed00000UL) && ((ioc->ibase + iova_space_size) > 0xfee00000UL)) { 1270 printk("WARNING: IOV space overlaps local config and interrupt message, truncating\n"); 1271 iova_space_size /= 2; 1272 } 1273 1274 /* 1275 ** iov_order is always based on a 1GB IOVA space since we want to 1276 ** turn on the other half for AGP GART. 1277 */ 1278 iov_order = get_order(iova_space_size >> (IOVP_SHIFT - PAGE_SHIFT)); 1279 ioc->pdir_size = (iova_space_size / IOVP_SIZE) * sizeof(u64); 1280 1281 DBG_INIT("%s() hpa 0x%p IOV %dMB (%d bits)\n", 1282 __func__, ioc->ioc_hpa, iova_space_size >> 20, 1283 iov_order + PAGE_SHIFT); 1284 1285 ioc->pdir_base = (void *) __get_free_pages(GFP_KERNEL, 1286 get_order(ioc->pdir_size)); 1287 if (!ioc->pdir_base) 1288 panic("Couldn't allocate I/O Page Table\n"); 1289 1290 memset(ioc->pdir_base, 0, ioc->pdir_size); 1291 1292 DBG_INIT("%s() pdir %p size %x\n", 1293 __func__, ioc->pdir_base, ioc->pdir_size); 1294 1295 #ifdef SBA_HINT_SUPPORT 1296 ioc->hint_shift_pdir = iov_order + PAGE_SHIFT; 1297 ioc->hint_mask_pdir = ~(0x3 << (iov_order + PAGE_SHIFT)); 1298 1299 DBG_INIT(" hint_shift_pdir %x hint_mask_pdir %lx\n", 1300 ioc->hint_shift_pdir, ioc->hint_mask_pdir); 1301 #endif 1302 1303 WARN_ON((((unsigned long) ioc->pdir_base) & PAGE_MASK) != (unsigned long) ioc->pdir_base); 1304 WRITE_REG(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE); 1305 1306 /* build IMASK for IOC and Elroy */ 1307 iova_space_mask = 0xffffffff; 1308 iova_space_mask <<= (iov_order + PAGE_SHIFT); 1309 ioc->imask = iova_space_mask; 1310 #ifdef ZX1_SUPPORT 1311 ioc->iovp_mask = ~(iova_space_mask + PAGE_SIZE - 1); 1312 #endif 1313 sba_dump_tlb(ioc->ioc_hpa); 1314 1315 setup_ibase_imask(sba, ioc, ioc_num); 1316 1317 WRITE_REG(ioc->imask, ioc->ioc_hpa + IOC_IMASK); 1318 1319 #ifdef CONFIG_64BIT 1320 /* 1321 ** Setting the upper bits makes checking for bypass addresses 1322 ** a little faster later on. 1323 */ 1324 ioc->imask |= 0xFFFFFFFF00000000UL; 1325 #endif 1326 1327 /* Set I/O PDIR Page size to system page size */ 1328 switch (PAGE_SHIFT) { 1329 case 12: tcnfg = 0; break; /* 4K */ 1330 case 13: tcnfg = 1; break; /* 8K */ 1331 case 14: tcnfg = 2; break; /* 16K */ 1332 case 16: tcnfg = 3; break; /* 64K */ 1333 default: 1334 panic(__FILE__ "Unsupported system page size %d", 1335 1 << PAGE_SHIFT); 1336 break; 1337 } 1338 WRITE_REG(tcnfg, ioc->ioc_hpa + IOC_TCNFG); 1339 1340 /* 1341 ** Program the IOC's ibase and enable IOVA translation 1342 ** Bit zero == enable bit. 1343 */ 1344 WRITE_REG(ioc->ibase | 1, ioc->ioc_hpa + IOC_IBASE); 1345 1346 /* 1347 ** Clear I/O TLB of any possible entries. 1348 ** (Yes. This is a bit paranoid...but so what) 1349 */ 1350 WRITE_REG(ioc->ibase | 31, ioc->ioc_hpa + IOC_PCOM); 1351 1352 #ifdef SBA_AGP_SUPPORT 1353 1354 /* 1355 ** If an AGP device is present, only use half of the IOV space 1356 ** for PCI DMA. Unfortunately we can't know ahead of time 1357 ** whether GART support will actually be used, for now we 1358 ** can just key on any AGP device found in the system. 1359 ** We program the next pdir index after we stop w/ a key for 1360 ** the GART code to handshake on. 1361 */ 1362 device_for_each_child(&sba->dev, &agp_found, sba_ioc_find_quicksilver); 1363 1364 if (agp_found && sba_reserve_agpgart) { 1365 printk(KERN_INFO "%s: reserving %dMb of IOVA space for agpgart\n", 1366 __func__, (iova_space_size/2) >> 20); 1367 ioc->pdir_size /= 2; 1368 ioc->pdir_base[PDIR_INDEX(iova_space_size/2)] = SBA_AGPGART_COOKIE; 1369 } 1370 #endif /*SBA_AGP_SUPPORT*/ 1371 } 1372 1373 static void 1374 sba_ioc_init(struct parisc_device *sba, struct ioc *ioc, int ioc_num) 1375 { 1376 u32 iova_space_size, iova_space_mask; 1377 unsigned int pdir_size, iov_order; 1378 1379 /* 1380 ** Determine IOVA Space size from memory size. 1381 ** 1382 ** Ideally, PCI drivers would register the maximum number 1383 ** of DMA they can have outstanding for each device they 1384 ** own. Next best thing would be to guess how much DMA 1385 ** can be outstanding based on PCI Class/sub-class. Both 1386 ** methods still require some "extra" to support PCI 1387 ** Hot-Plug/Removal of PCI cards. (aka PCI OLARD). 1388 ** 1389 ** While we have 32-bits "IOVA" space, top two 2 bits are used 1390 ** for DMA hints - ergo only 30 bits max. 1391 */ 1392 1393 iova_space_size = (u32) (num_physpages/global_ioc_cnt); 1394 1395 /* limit IOVA space size to 1MB-1GB */ 1396 if (iova_space_size < (1 << (20 - PAGE_SHIFT))) { 1397 iova_space_size = 1 << (20 - PAGE_SHIFT); 1398 } 1399 else if (iova_space_size > (1 << (30 - PAGE_SHIFT))) { 1400 iova_space_size = 1 << (30 - PAGE_SHIFT); 1401 } 1402 1403 /* 1404 ** iova space must be log2() in size. 1405 ** thus, pdir/res_map will also be log2(). 1406 ** PIRANHA BUG: Exception is when IO Pdir is 2MB (gets reduced) 1407 */ 1408 iov_order = get_order(iova_space_size << PAGE_SHIFT); 1409 1410 /* iova_space_size is now bytes, not pages */ 1411 iova_space_size = 1 << (iov_order + PAGE_SHIFT); 1412 1413 ioc->pdir_size = pdir_size = (iova_space_size/IOVP_SIZE) * sizeof(u64); 1414 1415 DBG_INIT("%s() hpa 0x%lx mem %ldMB IOV %dMB (%d bits)\n", 1416 __func__, 1417 ioc->ioc_hpa, 1418 (unsigned long) num_physpages >> (20 - PAGE_SHIFT), 1419 iova_space_size>>20, 1420 iov_order + PAGE_SHIFT); 1421 1422 ioc->pdir_base = sba_alloc_pdir(pdir_size); 1423 1424 DBG_INIT("%s() pdir %p size %x\n", 1425 __func__, ioc->pdir_base, pdir_size); 1426 1427 #ifdef SBA_HINT_SUPPORT 1428 /* FIXME : DMA HINTs not used */ 1429 ioc->hint_shift_pdir = iov_order + PAGE_SHIFT; 1430 ioc->hint_mask_pdir = ~(0x3 << (iov_order + PAGE_SHIFT)); 1431 1432 DBG_INIT(" hint_shift_pdir %x hint_mask_pdir %lx\n", 1433 ioc->hint_shift_pdir, ioc->hint_mask_pdir); 1434 #endif 1435 1436 WRITE_REG64(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE); 1437 1438 /* build IMASK for IOC and Elroy */ 1439 iova_space_mask = 0xffffffff; 1440 iova_space_mask <<= (iov_order + PAGE_SHIFT); 1441 1442 /* 1443 ** On C3000 w/512MB mem, HP-UX 10.20 reports: 1444 ** ibase=0, imask=0xFE000000, size=0x2000000. 1445 */ 1446 ioc->ibase = 0; 1447 ioc->imask = iova_space_mask; /* save it */ 1448 #ifdef ZX1_SUPPORT 1449 ioc->iovp_mask = ~(iova_space_mask + PAGE_SIZE - 1); 1450 #endif 1451 1452 DBG_INIT("%s() IOV base 0x%lx mask 0x%0lx\n", 1453 __func__, ioc->ibase, ioc->imask); 1454 1455 /* 1456 ** FIXME: Hint registers are programmed with default hint 1457 ** values during boot, so hints should be sane even if we 1458 ** can't reprogram them the way drivers want. 1459 */ 1460 1461 setup_ibase_imask(sba, ioc, ioc_num); 1462 1463 /* 1464 ** Program the IOC's ibase and enable IOVA translation 1465 */ 1466 WRITE_REG(ioc->ibase | 1, ioc->ioc_hpa+IOC_IBASE); 1467 WRITE_REG(ioc->imask, ioc->ioc_hpa+IOC_IMASK); 1468 1469 /* Set I/O PDIR Page size to 4K */ 1470 WRITE_REG(0, ioc->ioc_hpa+IOC_TCNFG); 1471 1472 /* 1473 ** Clear I/O TLB of any possible entries. 1474 ** (Yes. This is a bit paranoid...but so what) 1475 */ 1476 WRITE_REG(0 | 31, ioc->ioc_hpa+IOC_PCOM); 1477 1478 ioc->ibase = 0; /* used by SBA_IOVA and related macros */ 1479 1480 DBG_INIT("%s() DONE\n", __func__); 1481 } 1482 1483 1484 1485 /************************************************************************** 1486 ** 1487 ** SBA initialization code (HW and SW) 1488 ** 1489 ** o identify SBA chip itself 1490 ** o initialize SBA chip modes (HardFail) 1491 ** o initialize SBA chip modes (HardFail) 1492 ** o FIXME: initialize DMA hints for reasonable defaults 1493 ** 1494 **************************************************************************/ 1495 1496 static void __iomem *ioc_remap(struct sba_device *sba_dev, unsigned int offset) 1497 { 1498 return ioremap_nocache(sba_dev->dev->hpa.start + offset, SBA_FUNC_SIZE); 1499 } 1500 1501 static void sba_hw_init(struct sba_device *sba_dev) 1502 { 1503 int i; 1504 int num_ioc; 1505 u64 ioc_ctl; 1506 1507 if (!is_pdc_pat()) { 1508 /* Shutdown the USB controller on Astro-based workstations. 1509 ** Once we reprogram the IOMMU, the next DMA performed by 1510 ** USB will HPMC the box. USB is only enabled if a 1511 ** keyboard is present and found. 1512 ** 1513 ** With serial console, j6k v5.0 firmware says: 1514 ** mem_kbd hpa 0xfee003f8 sba 0x0 pad 0x0 cl_class 0x7 1515 ** 1516 ** FIXME: Using GFX+USB console at power up but direct 1517 ** linux to serial console is still broken. 1518 ** USB could generate DMA so we must reset USB. 1519 ** The proper sequence would be: 1520 ** o block console output 1521 ** o reset USB device 1522 ** o reprogram serial port 1523 ** o unblock console output 1524 */ 1525 if (PAGE0->mem_kbd.cl_class == CL_KEYBD) { 1526 pdc_io_reset_devices(); 1527 } 1528 1529 } 1530 1531 1532 #if 0 1533 printk("sba_hw_init(): mem_boot 0x%x 0x%x 0x%x 0x%x\n", PAGE0->mem_boot.hpa, 1534 PAGE0->mem_boot.spa, PAGE0->mem_boot.pad, PAGE0->mem_boot.cl_class); 1535 1536 /* 1537 ** Need to deal with DMA from LAN. 1538 ** Maybe use page zero boot device as a handle to talk 1539 ** to PDC about which device to shutdown. 1540 ** 1541 ** Netbooting, j6k v5.0 firmware says: 1542 ** mem_boot hpa 0xf4008000 sba 0x0 pad 0x0 cl_class 0x1002 1543 ** ARGH! invalid class. 1544 */ 1545 if ((PAGE0->mem_boot.cl_class != CL_RANDOM) 1546 && (PAGE0->mem_boot.cl_class != CL_SEQU)) { 1547 pdc_io_reset(); 1548 } 1549 #endif 1550 1551 if (!IS_PLUTO(sba_dev->dev)) { 1552 ioc_ctl = READ_REG(sba_dev->sba_hpa+IOC_CTRL); 1553 DBG_INIT("%s() hpa 0x%lx ioc_ctl 0x%Lx ->", 1554 __func__, sba_dev->sba_hpa, ioc_ctl); 1555 ioc_ctl &= ~(IOC_CTRL_RM | IOC_CTRL_NC | IOC_CTRL_CE); 1556 ioc_ctl |= IOC_CTRL_DD | IOC_CTRL_D4 | IOC_CTRL_TC; 1557 /* j6700 v1.6 firmware sets 0x294f */ 1558 /* A500 firmware sets 0x4d */ 1559 1560 WRITE_REG(ioc_ctl, sba_dev->sba_hpa+IOC_CTRL); 1561 1562 #ifdef DEBUG_SBA_INIT 1563 ioc_ctl = READ_REG64(sba_dev->sba_hpa+IOC_CTRL); 1564 DBG_INIT(" 0x%Lx\n", ioc_ctl); 1565 #endif 1566 } /* if !PLUTO */ 1567 1568 if (IS_ASTRO(sba_dev->dev)) { 1569 int err; 1570 sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, ASTRO_IOC_OFFSET); 1571 num_ioc = 1; 1572 1573 sba_dev->chip_resv.name = "Astro Intr Ack"; 1574 sba_dev->chip_resv.start = PCI_F_EXTEND | 0xfef00000UL; 1575 sba_dev->chip_resv.end = PCI_F_EXTEND | (0xff000000UL - 1) ; 1576 err = request_resource(&iomem_resource, &(sba_dev->chip_resv)); 1577 BUG_ON(err < 0); 1578 1579 } else if (IS_PLUTO(sba_dev->dev)) { 1580 int err; 1581 1582 sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, PLUTO_IOC_OFFSET); 1583 num_ioc = 1; 1584 1585 sba_dev->chip_resv.name = "Pluto Intr/PIOP/VGA"; 1586 sba_dev->chip_resv.start = PCI_F_EXTEND | 0xfee00000UL; 1587 sba_dev->chip_resv.end = PCI_F_EXTEND | (0xff200000UL - 1); 1588 err = request_resource(&iomem_resource, &(sba_dev->chip_resv)); 1589 WARN_ON(err < 0); 1590 1591 sba_dev->iommu_resv.name = "IOVA Space"; 1592 sba_dev->iommu_resv.start = 0x40000000UL; 1593 sba_dev->iommu_resv.end = 0x50000000UL - 1; 1594 err = request_resource(&iomem_resource, &(sba_dev->iommu_resv)); 1595 WARN_ON(err < 0); 1596 } else { 1597 /* IKE, REO */ 1598 sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, IKE_IOC_OFFSET(0)); 1599 sba_dev->ioc[1].ioc_hpa = ioc_remap(sba_dev, IKE_IOC_OFFSET(1)); 1600 num_ioc = 2; 1601 1602 /* TODO - LOOKUP Ike/Stretch chipset mem map */ 1603 } 1604 /* XXX: What about Reo Grande? */ 1605 1606 sba_dev->num_ioc = num_ioc; 1607 for (i = 0; i < num_ioc; i++) { 1608 void __iomem *ioc_hpa = sba_dev->ioc[i].ioc_hpa; 1609 unsigned int j; 1610 1611 for (j=0; j < sizeof(u64) * ROPES_PER_IOC; j+=sizeof(u64)) { 1612 1613 /* 1614 * Clear ROPE(N)_CONFIG AO bit. 1615 * Disables "NT Ordering" (~= !"Relaxed Ordering") 1616 * Overrides bit 1 in DMA Hint Sets. 1617 * Improves netperf UDP_STREAM by ~10% for bcm5701. 1618 */ 1619 if (IS_PLUTO(sba_dev->dev)) { 1620 void __iomem *rope_cfg; 1621 unsigned long cfg_val; 1622 1623 rope_cfg = ioc_hpa + IOC_ROPE0_CFG + j; 1624 cfg_val = READ_REG(rope_cfg); 1625 cfg_val &= ~IOC_ROPE_AO; 1626 WRITE_REG(cfg_val, rope_cfg); 1627 } 1628 1629 /* 1630 ** Make sure the box crashes on rope errors. 1631 */ 1632 WRITE_REG(HF_ENABLE, ioc_hpa + ROPE0_CTL + j); 1633 } 1634 1635 /* flush out the last writes */ 1636 READ_REG(sba_dev->ioc[i].ioc_hpa + ROPE7_CTL); 1637 1638 DBG_INIT(" ioc[%d] ROPE_CFG 0x%Lx ROPE_DBG 0x%Lx\n", 1639 i, 1640 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x40), 1641 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x50) 1642 ); 1643 DBG_INIT(" STATUS_CONTROL 0x%Lx FLUSH_CTRL 0x%Lx\n", 1644 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x108), 1645 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x400) 1646 ); 1647 1648 if (IS_PLUTO(sba_dev->dev)) { 1649 sba_ioc_init_pluto(sba_dev->dev, &(sba_dev->ioc[i]), i); 1650 } else { 1651 sba_ioc_init(sba_dev->dev, &(sba_dev->ioc[i]), i); 1652 } 1653 } 1654 } 1655 1656 static void 1657 sba_common_init(struct sba_device *sba_dev) 1658 { 1659 int i; 1660 1661 /* add this one to the head of the list (order doesn't matter) 1662 ** This will be useful for debugging - especially if we get coredumps 1663 */ 1664 sba_dev->next = sba_list; 1665 sba_list = sba_dev; 1666 1667 for(i=0; i< sba_dev->num_ioc; i++) { 1668 int res_size; 1669 #ifdef DEBUG_DMB_TRAP 1670 extern void iterate_pages(unsigned long , unsigned long , 1671 void (*)(pte_t * , unsigned long), 1672 unsigned long ); 1673 void set_data_memory_break(pte_t * , unsigned long); 1674 #endif 1675 /* resource map size dictated by pdir_size */ 1676 res_size = sba_dev->ioc[i].pdir_size/sizeof(u64); /* entries */ 1677 1678 /* Second part of PIRANHA BUG */ 1679 if (piranha_bad_128k) { 1680 res_size -= (128*1024)/sizeof(u64); 1681 } 1682 1683 res_size >>= 3; /* convert bit count to byte count */ 1684 DBG_INIT("%s() res_size 0x%x\n", 1685 __func__, res_size); 1686 1687 sba_dev->ioc[i].res_size = res_size; 1688 sba_dev->ioc[i].res_map = (char *) __get_free_pages(GFP_KERNEL, get_order(res_size)); 1689 1690 #ifdef DEBUG_DMB_TRAP 1691 iterate_pages( sba_dev->ioc[i].res_map, res_size, 1692 set_data_memory_break, 0); 1693 #endif 1694 1695 if (NULL == sba_dev->ioc[i].res_map) 1696 { 1697 panic("%s:%s() could not allocate resource map\n", 1698 __FILE__, __func__ ); 1699 } 1700 1701 memset(sba_dev->ioc[i].res_map, 0, res_size); 1702 /* next available IOVP - circular search */ 1703 sba_dev->ioc[i].res_hint = (unsigned long *) 1704 &(sba_dev->ioc[i].res_map[L1_CACHE_BYTES]); 1705 1706 #ifdef ASSERT_PDIR_SANITY 1707 /* Mark first bit busy - ie no IOVA 0 */ 1708 sba_dev->ioc[i].res_map[0] = 0x80; 1709 sba_dev->ioc[i].pdir_base[0] = 0xeeffc0addbba0080ULL; 1710 #endif 1711 1712 /* Third (and last) part of PIRANHA BUG */ 1713 if (piranha_bad_128k) { 1714 /* region from +1408K to +1536 is un-usable. */ 1715 1716 int idx_start = (1408*1024/sizeof(u64)) >> 3; 1717 int idx_end = (1536*1024/sizeof(u64)) >> 3; 1718 long *p_start = (long *) &(sba_dev->ioc[i].res_map[idx_start]); 1719 long *p_end = (long *) &(sba_dev->ioc[i].res_map[idx_end]); 1720 1721 /* mark that part of the io pdir busy */ 1722 while (p_start < p_end) 1723 *p_start++ = -1; 1724 1725 } 1726 1727 #ifdef DEBUG_DMB_TRAP 1728 iterate_pages( sba_dev->ioc[i].res_map, res_size, 1729 set_data_memory_break, 0); 1730 iterate_pages( sba_dev->ioc[i].pdir_base, sba_dev->ioc[i].pdir_size, 1731 set_data_memory_break, 0); 1732 #endif 1733 1734 DBG_INIT("%s() %d res_map %x %p\n", 1735 __func__, i, res_size, sba_dev->ioc[i].res_map); 1736 } 1737 1738 spin_lock_init(&sba_dev->sba_lock); 1739 ioc_needs_fdc = boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC; 1740 1741 #ifdef DEBUG_SBA_INIT 1742 /* 1743 * If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set 1744 * (bit #61, big endian), we have to flush and sync every time 1745 * IO-PDIR is changed in Ike/Astro. 1746 */ 1747 if (ioc_needs_fdc) { 1748 printk(KERN_INFO MODULE_NAME " FDC/SYNC required.\n"); 1749 } else { 1750 printk(KERN_INFO MODULE_NAME " IOC has cache coherent PDIR.\n"); 1751 } 1752 #endif 1753 } 1754 1755 #ifdef CONFIG_PROC_FS 1756 static int sba_proc_info(struct seq_file *m, void *p) 1757 { 1758 struct sba_device *sba_dev = sba_list; 1759 struct ioc *ioc = &sba_dev->ioc[0]; /* FIXME: Multi-IOC support! */ 1760 int total_pages = (int) (ioc->res_size << 3); /* 8 bits per byte */ 1761 #ifdef SBA_COLLECT_STATS 1762 unsigned long avg = 0, min, max; 1763 #endif 1764 int i, len = 0; 1765 1766 len += seq_printf(m, "%s rev %d.%d\n", 1767 sba_dev->name, 1768 (sba_dev->hw_rev & 0x7) + 1, 1769 (sba_dev->hw_rev & 0x18) >> 3 1770 ); 1771 len += seq_printf(m, "IO PDIR size : %d bytes (%d entries)\n", 1772 (int) ((ioc->res_size << 3) * sizeof(u64)), /* 8 bits/byte */ 1773 total_pages); 1774 1775 len += seq_printf(m, "Resource bitmap : %d bytes (%d pages)\n", 1776 ioc->res_size, ioc->res_size << 3); /* 8 bits per byte */ 1777 1778 len += seq_printf(m, "LMMIO_BASE/MASK/ROUTE %08x %08x %08x\n", 1779 READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_BASE), 1780 READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_MASK), 1781 READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_ROUTE) 1782 ); 1783 1784 for (i=0; i<4; i++) 1785 len += seq_printf(m, "DIR%d_BASE/MASK/ROUTE %08x %08x %08x\n", i, 1786 READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_BASE + i*0x18), 1787 READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_MASK + i*0x18), 1788 READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_ROUTE + i*0x18) 1789 ); 1790 1791 #ifdef SBA_COLLECT_STATS 1792 len += seq_printf(m, "IO PDIR entries : %ld free %ld used (%d%%)\n", 1793 total_pages - ioc->used_pages, ioc->used_pages, 1794 (int) (ioc->used_pages * 100 / total_pages)); 1795 1796 min = max = ioc->avg_search[0]; 1797 for (i = 0; i < SBA_SEARCH_SAMPLE; i++) { 1798 avg += ioc->avg_search[i]; 1799 if (ioc->avg_search[i] > max) max = ioc->avg_search[i]; 1800 if (ioc->avg_search[i] < min) min = ioc->avg_search[i]; 1801 } 1802 avg /= SBA_SEARCH_SAMPLE; 1803 len += seq_printf(m, " Bitmap search : %ld/%ld/%ld (min/avg/max CPU Cycles)\n", 1804 min, avg, max); 1805 1806 len += seq_printf(m, "pci_map_single(): %12ld calls %12ld pages (avg %d/1000)\n", 1807 ioc->msingle_calls, ioc->msingle_pages, 1808 (int) ((ioc->msingle_pages * 1000)/ioc->msingle_calls)); 1809 1810 /* KLUGE - unmap_sg calls unmap_single for each mapped page */ 1811 min = ioc->usingle_calls; 1812 max = ioc->usingle_pages - ioc->usg_pages; 1813 len += seq_printf(m, "pci_unmap_single: %12ld calls %12ld pages (avg %d/1000)\n", 1814 min, max, (int) ((max * 1000)/min)); 1815 1816 len += seq_printf(m, "pci_map_sg() : %12ld calls %12ld pages (avg %d/1000)\n", 1817 ioc->msg_calls, ioc->msg_pages, 1818 (int) ((ioc->msg_pages * 1000)/ioc->msg_calls)); 1819 1820 len += seq_printf(m, "pci_unmap_sg() : %12ld calls %12ld pages (avg %d/1000)\n", 1821 ioc->usg_calls, ioc->usg_pages, 1822 (int) ((ioc->usg_pages * 1000)/ioc->usg_calls)); 1823 #endif 1824 1825 return 0; 1826 } 1827 1828 static int 1829 sba_proc_open(struct inode *i, struct file *f) 1830 { 1831 return single_open(f, &sba_proc_info, NULL); 1832 } 1833 1834 static const struct file_operations sba_proc_fops = { 1835 .owner = THIS_MODULE, 1836 .open = sba_proc_open, 1837 .read = seq_read, 1838 .llseek = seq_lseek, 1839 .release = single_release, 1840 }; 1841 1842 static int 1843 sba_proc_bitmap_info(struct seq_file *m, void *p) 1844 { 1845 struct sba_device *sba_dev = sba_list; 1846 struct ioc *ioc = &sba_dev->ioc[0]; /* FIXME: Multi-IOC support! */ 1847 unsigned int *res_ptr = (unsigned int *)ioc->res_map; 1848 int i, len = 0; 1849 1850 for (i = 0; i < (ioc->res_size/sizeof(unsigned int)); ++i, ++res_ptr) { 1851 if ((i & 7) == 0) 1852 len += seq_printf(m, "\n "); 1853 len += seq_printf(m, " %08x", *res_ptr); 1854 } 1855 len += seq_printf(m, "\n"); 1856 1857 return 0; 1858 } 1859 1860 static int 1861 sba_proc_bitmap_open(struct inode *i, struct file *f) 1862 { 1863 return single_open(f, &sba_proc_bitmap_info, NULL); 1864 } 1865 1866 static const struct file_operations sba_proc_bitmap_fops = { 1867 .owner = THIS_MODULE, 1868 .open = sba_proc_bitmap_open, 1869 .read = seq_read, 1870 .llseek = seq_lseek, 1871 .release = single_release, 1872 }; 1873 #endif /* CONFIG_PROC_FS */ 1874 1875 static struct parisc_device_id sba_tbl[] = { 1876 { HPHW_IOA, HVERSION_REV_ANY_ID, ASTRO_RUNWAY_PORT, 0xb }, 1877 { HPHW_BCPORT, HVERSION_REV_ANY_ID, IKE_MERCED_PORT, 0xc }, 1878 { HPHW_BCPORT, HVERSION_REV_ANY_ID, REO_MERCED_PORT, 0xc }, 1879 { HPHW_BCPORT, HVERSION_REV_ANY_ID, REOG_MERCED_PORT, 0xc }, 1880 { HPHW_IOA, HVERSION_REV_ANY_ID, PLUTO_MCKINLEY_PORT, 0xc }, 1881 { 0, } 1882 }; 1883 1884 static int sba_driver_callback(struct parisc_device *); 1885 1886 static struct parisc_driver sba_driver = { 1887 .name = MODULE_NAME, 1888 .id_table = sba_tbl, 1889 .probe = sba_driver_callback, 1890 }; 1891 1892 /* 1893 ** Determine if sba should claim this chip (return 0) or not (return 1). 1894 ** If so, initialize the chip and tell other partners in crime they 1895 ** have work to do. 1896 */ 1897 static int sba_driver_callback(struct parisc_device *dev) 1898 { 1899 struct sba_device *sba_dev; 1900 u32 func_class; 1901 int i; 1902 char *version; 1903 void __iomem *sba_addr = ioremap_nocache(dev->hpa.start, SBA_FUNC_SIZE); 1904 #ifdef CONFIG_PROC_FS 1905 struct proc_dir_entry *root; 1906 #endif 1907 1908 sba_dump_ranges(sba_addr); 1909 1910 /* Read HW Rev First */ 1911 func_class = READ_REG(sba_addr + SBA_FCLASS); 1912 1913 if (IS_ASTRO(dev)) { 1914 unsigned long fclass; 1915 static char astro_rev[]="Astro ?.?"; 1916 1917 /* Astro is broken...Read HW Rev First */ 1918 fclass = READ_REG(sba_addr); 1919 1920 astro_rev[6] = '1' + (char) (fclass & 0x7); 1921 astro_rev[8] = '0' + (char) ((fclass & 0x18) >> 3); 1922 version = astro_rev; 1923 1924 } else if (IS_IKE(dev)) { 1925 static char ike_rev[] = "Ike rev ?"; 1926 ike_rev[8] = '0' + (char) (func_class & 0xff); 1927 version = ike_rev; 1928 } else if (IS_PLUTO(dev)) { 1929 static char pluto_rev[]="Pluto ?.?"; 1930 pluto_rev[6] = '0' + (char) ((func_class & 0xf0) >> 4); 1931 pluto_rev[8] = '0' + (char) (func_class & 0x0f); 1932 version = pluto_rev; 1933 } else { 1934 static char reo_rev[] = "REO rev ?"; 1935 reo_rev[8] = '0' + (char) (func_class & 0xff); 1936 version = reo_rev; 1937 } 1938 1939 if (!global_ioc_cnt) { 1940 global_ioc_cnt = count_parisc_driver(&sba_driver); 1941 1942 /* Astro and Pluto have one IOC per SBA */ 1943 if ((!IS_ASTRO(dev)) || (!IS_PLUTO(dev))) 1944 global_ioc_cnt *= 2; 1945 } 1946 1947 printk(KERN_INFO "%s found %s at 0x%llx\n", 1948 MODULE_NAME, version, (unsigned long long)dev->hpa.start); 1949 1950 sba_dev = kzalloc(sizeof(struct sba_device), GFP_KERNEL); 1951 if (!sba_dev) { 1952 printk(KERN_ERR MODULE_NAME " - couldn't alloc sba_device\n"); 1953 return -ENOMEM; 1954 } 1955 1956 parisc_set_drvdata(dev, sba_dev); 1957 1958 for(i=0; i<MAX_IOC; i++) 1959 spin_lock_init(&(sba_dev->ioc[i].res_lock)); 1960 1961 sba_dev->dev = dev; 1962 sba_dev->hw_rev = func_class; 1963 sba_dev->name = dev->name; 1964 sba_dev->sba_hpa = sba_addr; 1965 1966 sba_get_pat_resources(sba_dev); 1967 sba_hw_init(sba_dev); 1968 sba_common_init(sba_dev); 1969 1970 hppa_dma_ops = &sba_ops; 1971 1972 #ifdef CONFIG_PROC_FS 1973 switch (dev->id.hversion) { 1974 case PLUTO_MCKINLEY_PORT: 1975 root = proc_mckinley_root; 1976 break; 1977 case ASTRO_RUNWAY_PORT: 1978 case IKE_MERCED_PORT: 1979 default: 1980 root = proc_runway_root; 1981 break; 1982 } 1983 1984 proc_create("sba_iommu", 0, root, &sba_proc_fops); 1985 proc_create("sba_iommu-bitmap", 0, root, &sba_proc_bitmap_fops); 1986 #endif 1987 1988 parisc_has_iommu(); 1989 return 0; 1990 } 1991 1992 /* 1993 ** One time initialization to let the world know the SBA was found. 1994 ** This is the only routine which is NOT static. 1995 ** Must be called exactly once before pci_init(). 1996 */ 1997 void __init sba_init(void) 1998 { 1999 register_parisc_driver(&sba_driver); 2000 } 2001 2002 2003 /** 2004 * sba_get_iommu - Assign the iommu pointer for the pci bus controller. 2005 * @dev: The parisc device. 2006 * 2007 * Returns the appropriate IOMMU data for the given parisc PCI controller. 2008 * This is cached and used later for PCI DMA Mapping. 2009 */ 2010 void * sba_get_iommu(struct parisc_device *pci_hba) 2011 { 2012 struct parisc_device *sba_dev = parisc_parent(pci_hba); 2013 struct sba_device *sba = sba_dev->dev.driver_data; 2014 char t = sba_dev->id.hw_type; 2015 int iocnum = (pci_hba->hw_path >> 3); /* rope # */ 2016 2017 WARN_ON((t != HPHW_IOA) && (t != HPHW_BCPORT)); 2018 2019 return &(sba->ioc[iocnum]); 2020 } 2021 2022 2023 /** 2024 * sba_directed_lmmio - return first directed LMMIO range routed to rope 2025 * @pa_dev: The parisc device. 2026 * @r: resource PCI host controller wants start/end fields assigned. 2027 * 2028 * For the given parisc PCI controller, determine if any direct ranges 2029 * are routed down the corresponding rope. 2030 */ 2031 void sba_directed_lmmio(struct parisc_device *pci_hba, struct resource *r) 2032 { 2033 struct parisc_device *sba_dev = parisc_parent(pci_hba); 2034 struct sba_device *sba = sba_dev->dev.driver_data; 2035 char t = sba_dev->id.hw_type; 2036 int i; 2037 int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1)); /* rope # */ 2038 2039 BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT)); 2040 2041 r->start = r->end = 0; 2042 2043 /* Astro has 4 directed ranges. Not sure about Ike/Pluto/et al */ 2044 for (i=0; i<4; i++) { 2045 int base, size; 2046 void __iomem *reg = sba->sba_hpa + i*0x18; 2047 2048 base = READ_REG32(reg + LMMIO_DIRECT0_BASE); 2049 if ((base & 1) == 0) 2050 continue; /* not enabled */ 2051 2052 size = READ_REG32(reg + LMMIO_DIRECT0_ROUTE); 2053 2054 if ((size & (ROPES_PER_IOC-1)) != rope) 2055 continue; /* directed down different rope */ 2056 2057 r->start = (base & ~1UL) | PCI_F_EXTEND; 2058 size = ~ READ_REG32(reg + LMMIO_DIRECT0_MASK); 2059 r->end = r->start + size; 2060 } 2061 } 2062 2063 2064 /** 2065 * sba_distributed_lmmio - return portion of distributed LMMIO range 2066 * @pa_dev: The parisc device. 2067 * @r: resource PCI host controller wants start/end fields assigned. 2068 * 2069 * For the given parisc PCI controller, return portion of distributed LMMIO 2070 * range. The distributed LMMIO is always present and it's just a question 2071 * of the base address and size of the range. 2072 */ 2073 void sba_distributed_lmmio(struct parisc_device *pci_hba, struct resource *r ) 2074 { 2075 struct parisc_device *sba_dev = parisc_parent(pci_hba); 2076 struct sba_device *sba = sba_dev->dev.driver_data; 2077 char t = sba_dev->id.hw_type; 2078 int base, size; 2079 int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1)); /* rope # */ 2080 2081 BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT)); 2082 2083 r->start = r->end = 0; 2084 2085 base = READ_REG32(sba->sba_hpa + LMMIO_DIST_BASE); 2086 if ((base & 1) == 0) { 2087 BUG(); /* Gah! Distr Range wasn't enabled! */ 2088 return; 2089 } 2090 2091 r->start = (base & ~1UL) | PCI_F_EXTEND; 2092 2093 size = (~READ_REG32(sba->sba_hpa + LMMIO_DIST_MASK)) / ROPES_PER_IOC; 2094 r->start += rope * (size + 1); /* adjust base for this rope */ 2095 r->end = r->start + size; 2096 } 2097