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
  94struct sba_device *sba_list;
  95EXPORT_SYMBOL_GPL(sba_list);
  96
  97static unsigned long ioc_needs_fdc = 0;
  98
  99/* global count of IOMMUs in the system */
 100static unsigned int global_ioc_cnt = 0;
 101
 102/* PA8700 (Piranha 2.2) bug workaround */
 103static 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
 113static int sba_reserve_agpgart = 1;
 114module_param(sba_reserve_agpgart, int, 0444);
 115MODULE_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 */
 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)
 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 */
 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
 317static 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 */
 333static SBA_INLINE unsigned long
 334sba_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 */
 432static int
 433sba_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 */
 486static SBA_INLINE void
 487sba_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
 521typedef 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
 564static void SBA_INLINE
 565sba_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 */
 607static SBA_INLINE void
 608sba_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 */
 673static 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 */
 711static dma_addr_t
 712sba_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 */
 790static void
 791sba_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 */
 866static 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 */
 897static void
 898sba_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
 919int 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 */
 932static int
 933sba_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 */
1016static void 
1017sba_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
1060static 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
1085static void
1086sba_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*/
1095PAT_MOD(mod)->mod_info.mod_pages   = PAT_GET_MOD_PAGES(temp);
1096	FIXME : ???
1097PAT_MOD(mod)->mod_info.dvi         = PAT_GET_DVI(temp);
1098	Tells where the dvi bits are located in the address.
1099PAT_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 */
1112static void *
1113sba_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
1209struct ibase_data_struct {
1210	struct ioc *ioc;
1211	int ioc_num;
1212};
1213
1214static 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. */
1227static void 
1228setup_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
1240static int
1241sba_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
1252static void
1253sba_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
1373static void
1374sba_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) (totalram_pages/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) totalram_pages >> (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
1496static 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
1501static 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
1533printk("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
1656static void
1657sba_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
1756static 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
1828static int
1829sba_proc_open(struct inode *i, struct file *f)
1830{
1831	return single_open(f, &sba_proc_info, NULL);
1832}
1833
1834static 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
1842static int
1843sba_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
1860static int
1861sba_proc_bitmap_open(struct inode *i, struct file *f)
1862{
1863	return single_open(f, &sba_proc_bitmap_info, NULL);
1864}
1865
1866static 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
1875static 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
1884static int sba_driver_callback(struct parisc_device *);
1885
1886static 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*/
1897static 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*/
1997void __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 */
2010void * sba_get_iommu(struct parisc_device *pci_hba)
2011{
2012	struct parisc_device *sba_dev = parisc_parent(pci_hba);
2013	struct sba_device *sba = dev_get_drvdata(&sba_dev->dev);
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 */
2031void 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 = dev_get_drvdata(&sba_dev->dev);
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		r->flags = IORESOURCE_MEM;
2061	}
2062}
2063
2064
2065/**
2066 * sba_distributed_lmmio - return portion of distributed LMMIO range
2067 * @pa_dev: The parisc device.
2068 * @r: resource PCI host controller wants start/end fields assigned.
2069 *
2070 * For the given parisc PCI controller, return portion of distributed LMMIO
2071 * range. The distributed LMMIO is always present and it's just a question
2072 * of the base address and size of the range.
2073 */
2074void sba_distributed_lmmio(struct parisc_device *pci_hba, struct resource *r )
2075{
2076	struct parisc_device *sba_dev = parisc_parent(pci_hba);
2077	struct sba_device *sba = dev_get_drvdata(&sba_dev->dev);
2078	char t = sba_dev->id.hw_type;
2079	int base, size;
2080	int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1));  /* rope # */
2081
2082	BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT));
2083
2084	r->start = r->end = 0;
2085
2086	base = READ_REG32(sba->sba_hpa + LMMIO_DIST_BASE);
2087	if ((base & 1) == 0) {
2088		BUG();	/* Gah! Distr Range wasn't enabled! */
2089		return;
2090	}
2091
2092	r->start = (base & ~1UL) | PCI_F_EXTEND;
2093
2094	size = (~READ_REG32(sba->sba_hpa + LMMIO_DIST_MASK)) / ROPES_PER_IOC;
2095	r->start += rope * (size + 1);	/* adjust base for this rope */
2096	r->end = r->start + size;
2097	r->flags = IORESOURCE_MEM;
2098}