1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3**  System Bus Adapter (SBA) I/O MMU manager
   4**
   5**	(c) Copyright 2000-2004 Grant Grundler <grundler @ parisc-linux x org>
   6**	(c) Copyright 2004 Naresh Kumar Inna <knaresh at india x hp x com>
   7**	(c) Copyright 2000-2004 Hewlett-Packard Company
   8**
   9**	Portions (c) 1999 Dave S. Miller (from sparc64 I/O MMU code)
  10**
  11**
  12**
  13** This module initializes the IOC (I/O Controller) found on B1000/C3000/
  14** J5000/J7000/N-class/L-class machines and their successors.
  15**
  16** FIXME: add DMA hint support programming in both sba and lba modules.
  17*/
  18
  19#include <linux/types.h>
  20#include <linux/kernel.h>
  21#include <linux/spinlock.h>
  22#include <linux/slab.h>
  23#include <linux/init.h>
  24
  25#include <linux/mm.h>
  26#include <linux/string.h>
  27#include <linux/pci.h>
  28#include <linux/dma-map-ops.h>
  29#include <linux/scatterlist.h>
  30#include <linux/iommu-helper.h>
  31/*
  32 * The semantics of 64 register access on 32bit systems can't be guaranteed
  33 * by the C standard, we hope the _lo_hi() macros defining readq and writeq
  34 * here will behave as expected.
  35 */
  36#include <linux/io-64-nonatomic-lo-hi.h>
  37
  38#include <asm/byteorder.h>
  39#include <asm/io.h>
  40#include <asm/dma.h>		/* for DMA_CHUNK_SIZE */
  41
  42#include <asm/hardware.h>	/* for register_parisc_driver() stuff */
  43
  44#include <linux/proc_fs.h>
  45#include <linux/seq_file.h>
  46#include <linux/module.h>
  47
  48#include <asm/ropes.h>
 
 
  49#include <asm/page.h>		/* for PAGE0 */
  50#include <asm/pdc.h>		/* for PDC_MODEL_* */
  51#include <asm/pdcpat.h>		/* for is_pdc_pat() */
  52#include <asm/parisc-device.h>
  53
  54#include "iommu.h"
  55
  56#define MODULE_NAME "SBA"
  57
  58/*
  59** The number of debug flags is a clue - this code is fragile.
  60** Don't even think about messing with it unless you have
  61** plenty of 710's to sacrifice to the computer gods. :^)
  62*/
  63#undef DEBUG_SBA_INIT
  64#undef DEBUG_SBA_RUN
  65#undef DEBUG_SBA_RUN_SG
  66#undef DEBUG_SBA_RESOURCE
  67#undef ASSERT_PDIR_SANITY
  68#undef DEBUG_LARGE_SG_ENTRIES
  69#undef DEBUG_DMB_TRAP
  70
  71#ifdef DEBUG_SBA_INIT
  72#define DBG_INIT(x...)	printk(x)
  73#else
  74#define DBG_INIT(x...)
  75#endif
  76
  77#ifdef DEBUG_SBA_RUN
  78#define DBG_RUN(x...)	printk(x)
  79#else
  80#define DBG_RUN(x...)
  81#endif
  82
  83#ifdef DEBUG_SBA_RUN_SG
  84#define DBG_RUN_SG(x...)	printk(x)
  85#else
  86#define DBG_RUN_SG(x...)
  87#endif
  88
  89
  90#ifdef DEBUG_SBA_RESOURCE
  91#define DBG_RES(x...)	printk(x)
  92#else
  93#define DBG_RES(x...)
  94#endif
  95
 
 
  96#define DEFAULT_DMA_HINT_REG	0
  97
  98struct sba_device *sba_list;
  99EXPORT_SYMBOL_GPL(sba_list);
 100
 101static unsigned long ioc_needs_fdc = 0;
 102
 103/* global count of IOMMUs in the system */
 104static unsigned int global_ioc_cnt = 0;
 105
 106/* PA8700 (Piranha 2.2) bug workaround */
 107static unsigned long piranha_bad_128k = 0;
 108
 109/* Looks nice and keeps the compiler happy */
 110#define SBA_DEV(d) ((struct sba_device *) (d))
 111
 112#ifdef CONFIG_AGP_PARISC
 113#define SBA_AGP_SUPPORT
 114#endif /*CONFIG_AGP_PARISC*/
 115
 116#ifdef SBA_AGP_SUPPORT
 117static int sba_reserve_agpgart = 1;
 118module_param(sba_reserve_agpgart, int, 0444);
 119MODULE_PARM_DESC(sba_reserve_agpgart, "Reserve half of IO pdir as AGPGART");
 120#endif
 121
 122static struct proc_dir_entry *proc_runway_root __ro_after_init;
 123static struct proc_dir_entry *proc_mckinley_root __ro_after_init;
 124
 125/************************************
 126** SBA register read and write support
 127**
 128** BE WARNED: register writes are posted.
 129**  (ie follow writes which must reach HW with a read)
 130**
 131** Superdome (in particular, REO) allows only 64-bit CSR accesses.
 132*/
 133#define READ_REG32(addr)	readl(addr)
 134#define READ_REG64(addr)	readq(addr)
 135#define WRITE_REG32(val, addr)	writel((val), (addr))
 136#define WRITE_REG64(val, addr)	writeq((val), (addr))
 137
 138#ifdef CONFIG_64BIT
 139#define READ_REG(addr)		READ_REG64(addr)
 140#define WRITE_REG(value, addr)	WRITE_REG64(value, addr)
 141#else
 142#define READ_REG(addr)		READ_REG32(addr)
 143#define WRITE_REG(value, addr)	WRITE_REG32(value, addr)
 144#endif
 145
 146#ifdef DEBUG_SBA_INIT
 147
 148/* NOTE: When CONFIG_64BIT isn't defined, READ_REG64() is two 32-bit reads */
 149
 150/**
 151 * sba_dump_ranges - debugging only - print ranges assigned to this IOA
 152 * @hpa: base address of the sba
 153 *
 154 * Print the MMIO and IO Port address ranges forwarded by an Astro/Ike/RIO
 155 * IO Adapter (aka Bus Converter).
 156 */
 157static void
 158sba_dump_ranges(void __iomem *hpa)
 159{
 160	DBG_INIT("SBA at 0x%p\n", hpa);
 161	DBG_INIT("IOS_DIST_BASE   : %Lx\n", READ_REG64(hpa+IOS_DIST_BASE));
 162	DBG_INIT("IOS_DIST_MASK   : %Lx\n", READ_REG64(hpa+IOS_DIST_MASK));
 163	DBG_INIT("IOS_DIST_ROUTE  : %Lx\n", READ_REG64(hpa+IOS_DIST_ROUTE));
 164	DBG_INIT("\n");
 165	DBG_INIT("IOS_DIRECT_BASE : %Lx\n", READ_REG64(hpa+IOS_DIRECT_BASE));
 166	DBG_INIT("IOS_DIRECT_MASK : %Lx\n", READ_REG64(hpa+IOS_DIRECT_MASK));
 167	DBG_INIT("IOS_DIRECT_ROUTE: %Lx\n", READ_REG64(hpa+IOS_DIRECT_ROUTE));
 168}
 169
 170/**
 171 * sba_dump_tlb - debugging only - print IOMMU operating parameters
 172 * @hpa: base address of the IOMMU
 173 *
 174 * Print the size/location of the IO MMU PDIR.
 175 */
 176static void sba_dump_tlb(void __iomem *hpa)
 177{
 178	DBG_INIT("IO TLB at 0x%p\n", hpa);
 179	DBG_INIT("IOC_IBASE    : 0x%Lx\n", READ_REG64(hpa+IOC_IBASE));
 180	DBG_INIT("IOC_IMASK    : 0x%Lx\n", READ_REG64(hpa+IOC_IMASK));
 181	DBG_INIT("IOC_TCNFG    : 0x%Lx\n", READ_REG64(hpa+IOC_TCNFG));
 182	DBG_INIT("IOC_PDIR_BASE: 0x%Lx\n", READ_REG64(hpa+IOC_PDIR_BASE));
 183	DBG_INIT("\n");
 184}
 185#else
 186#define sba_dump_ranges(x)
 187#define sba_dump_tlb(x)
 188#endif	/* DEBUG_SBA_INIT */
 189
 190
 191#ifdef ASSERT_PDIR_SANITY
 192
 193/**
 194 * sba_dump_pdir_entry - debugging only - print one IOMMU PDIR entry
 195 * @ioc: IO MMU structure which owns the pdir we are interested in.
 196 * @msg: text to print ont the output line.
 197 * @pide: pdir index.
 198 *
 199 * Print one entry of the IO MMU PDIR in human readable form.
 200 */
 201static void
 202sba_dump_pdir_entry(struct ioc *ioc, char *msg, uint pide)
 203{
 204	/* start printing from lowest pde in rval */
 205	__le64 *ptr = &(ioc->pdir_base[pide & (~0U * BITS_PER_LONG)]);
 206	unsigned long *rptr = (unsigned long *) &(ioc->res_map[(pide >>3) & ~(sizeof(unsigned long) - 1)]);
 207	uint rcnt;
 208
 209	printk(KERN_DEBUG "SBA: %s rp %p bit %d rval 0x%lx\n",
 210		 msg,
 211		 rptr, pide & (BITS_PER_LONG - 1), *rptr);
 212
 213	rcnt = 0;
 214	while (rcnt < BITS_PER_LONG) {
 215		printk(KERN_DEBUG "%s %2d %p %016Lx\n",
 216			(rcnt == (pide & (BITS_PER_LONG - 1)))
 217				? "    -->" : "       ",
 218			rcnt, ptr, *ptr );
 219		rcnt++;
 220		ptr++;
 221	}
 222	printk(KERN_DEBUG "%s", msg);
 223}
 224
 225
 226/**
 227 * sba_check_pdir - debugging only - consistency checker
 228 * @ioc: IO MMU structure which owns the pdir we are interested in.
 229 * @msg: text to print ont the output line.
 230 *
 231 * Verify the resource map and pdir state is consistent
 232 */
 233static int
 234sba_check_pdir(struct ioc *ioc, char *msg)
 235{
 236	u32 *rptr_end = (u32 *) &(ioc->res_map[ioc->res_size]);
 237	u32 *rptr = (u32 *) ioc->res_map;	/* resource map ptr */
 238	u64 *pptr = ioc->pdir_base;	/* pdir ptr */
 239	uint pide = 0;
 240
 241	while (rptr < rptr_end) {
 242		u32 rval = *rptr;
 243		int rcnt = 32;	/* number of bits we might check */
 244
 245		while (rcnt) {
 246			/* Get last byte and highest bit from that */
 247			u32 pde = ((u32) (((char *)pptr)[7])) << 24;
 248			if ((rval ^ pde) & 0x80000000)
 249			{
 250				/*
 251				** BUMMER!  -- res_map != pdir --
 252				** Dump rval and matching pdir entries
 253				*/
 254				sba_dump_pdir_entry(ioc, msg, pide);
 255				return(1);
 256			}
 257			rcnt--;
 258			rval <<= 1;	/* try the next bit */
 259			pptr++;
 260			pide++;
 261		}
 262		rptr++;	/* look at next word of res_map */
 263	}
 264	/* It'd be nice if we always got here :^) */
 265	return 0;
 266}
 267
 268
 269/**
 270 * sba_dump_sg - debugging only - print Scatter-Gather list
 271 * @ioc: IO MMU structure which owns the pdir we are interested in.
 272 * @startsg: head of the SG list
 273 * @nents: number of entries in SG list
 274 *
 275 * print the SG list so we can verify it's correct by hand.
 276 */
 277static void
 278sba_dump_sg( struct ioc *ioc, struct scatterlist *startsg, int nents)
 279{
 280	while (nents-- > 0) {
 281		printk(KERN_DEBUG " %d : %08lx/%05x %p/%05x\n",
 282				nents,
 283				(unsigned long) sg_dma_address(startsg),
 284				sg_dma_len(startsg),
 285				sg_virt(startsg), startsg->length);
 286		startsg++;
 287	}
 288}
 289
 290#endif /* ASSERT_PDIR_SANITY */
 291
 292
 293
 294
 295/**************************************************************
 296*
 297*   I/O Pdir Resource Management
 298*
 299*   Bits set in the resource map are in use.
 300*   Each bit can represent a number of pages.
 301*   LSbs represent lower addresses (IOVA's).
 302*
 303***************************************************************/
 304#define PAGES_PER_RANGE 1	/* could increase this to 4 or 8 if needed */
 305
 306/* Convert from IOVP to IOVA and vice versa. */
 307
 308#ifdef ZX1_SUPPORT
 309/* Pluto (aka ZX1) boxes need to set or clear the ibase bits appropriately */
 310#define SBA_IOVA(ioc,iovp,offset,hint_reg) ((ioc->ibase) | (iovp) | (offset))
 311#define SBA_IOVP(ioc,iova) ((iova) & (ioc)->iovp_mask)
 312#else
 313/* only support Astro and ancestors. Saves a few cycles in key places */
 314#define SBA_IOVA(ioc,iovp,offset,hint_reg) ((iovp) | (offset))
 315#define SBA_IOVP(ioc,iova) (iova)
 316#endif
 317
 318#define PDIR_INDEX(iovp)   ((iovp)>>IOVP_SHIFT)
 319
 320#define RESMAP_MASK(n)    (~0UL << (BITS_PER_LONG - (n)))
 321#define RESMAP_IDX_MASK   (sizeof(unsigned long) - 1)
 322
 323static unsigned long ptr_to_pide(struct ioc *ioc, unsigned long *res_ptr,
 324				 unsigned int bitshiftcnt)
 325{
 326	return (((unsigned long)res_ptr - (unsigned long)ioc->res_map) << 3)
 327		+ bitshiftcnt;
 328}
 329
 330/**
 331 * sba_search_bitmap - find free space in IO PDIR resource bitmap
 332 * @ioc: IO MMU structure which owns the pdir we are interested in.
 333 * @dev: device to query the bitmap for
 334 * @bits_wanted: number of entries we need.
 335 *
 336 * Find consecutive free bits in resource bitmap.
 337 * Each bit represents one entry in the IO Pdir.
 338 * Cool perf optimization: search for log2(size) bits at a time.
 339 */
 340static unsigned long
 341sba_search_bitmap(struct ioc *ioc, struct device *dev,
 342		  unsigned long bits_wanted)
 343{
 344	unsigned long *res_ptr = ioc->res_hint;
 345	unsigned long *res_end = (unsigned long *) &(ioc->res_map[ioc->res_size]);
 346	unsigned long pide = ~0UL, tpide;
 347	unsigned long boundary_size;
 348	unsigned long shift;
 349	int ret;
 350
 351	boundary_size = dma_get_seg_boundary_nr_pages(dev, IOVP_SHIFT);
 
 352
 353#if defined(ZX1_SUPPORT)
 354	BUG_ON(ioc->ibase & ~IOVP_MASK);
 355	shift = ioc->ibase >> IOVP_SHIFT;
 356#else
 357	shift = 0;
 358#endif
 359
 360	if (bits_wanted > (BITS_PER_LONG/2)) {
 361		/* Search word at a time - no mask needed */
 362		for(; res_ptr < res_end; ++res_ptr) {
 363			tpide = ptr_to_pide(ioc, res_ptr, 0);
 364			ret = iommu_is_span_boundary(tpide, bits_wanted,
 365						     shift,
 366						     boundary_size);
 367			if ((*res_ptr == 0) && !ret) {
 368				*res_ptr = RESMAP_MASK(bits_wanted);
 369				pide = tpide;
 370				break;
 371			}
 372		}
 373		/* point to the next word on next pass */
 374		res_ptr++;
 375		ioc->res_bitshift = 0;
 376	} else {
 377		/*
 378		** Search the resource bit map on well-aligned values.
 379		** "o" is the alignment.
 380		** We need the alignment to invalidate I/O TLB using
 381		** SBA HW features in the unmap path.
 382		*/
 383		unsigned long o = 1 << get_order(bits_wanted << PAGE_SHIFT);
 384		uint bitshiftcnt = ALIGN(ioc->res_bitshift, o);
 385		unsigned long mask;
 386
 387		if (bitshiftcnt >= BITS_PER_LONG) {
 388			bitshiftcnt = 0;
 389			res_ptr++;
 390		}
 391		mask = RESMAP_MASK(bits_wanted) >> bitshiftcnt;
 392
 393		DBG_RES("%s() o %ld %p", __func__, o, res_ptr);
 394		while(res_ptr < res_end)
 395		{ 
 396			DBG_RES("    %p %lx %lx\n", res_ptr, mask, *res_ptr);
 397			WARN_ON(mask == 0);
 398			tpide = ptr_to_pide(ioc, res_ptr, bitshiftcnt);
 399			ret = iommu_is_span_boundary(tpide, bits_wanted,
 400						     shift,
 401						     boundary_size);
 402			if ((((*res_ptr) & mask) == 0) && !ret) {
 403				*res_ptr |= mask;     /* mark resources busy! */
 404				pide = tpide;
 405				break;
 406			}
 407			mask >>= o;
 408			bitshiftcnt += o;
 409			if (mask == 0) {
 410				mask = RESMAP_MASK(bits_wanted);
 411				bitshiftcnt=0;
 412				res_ptr++;
 413			}
 414		}
 415		/* look in the same word on the next pass */
 416		ioc->res_bitshift = bitshiftcnt + bits_wanted;
 417	}
 418
 419	/* wrapped ? */
 420	if (res_end <= res_ptr) {
 421		ioc->res_hint = (unsigned long *) ioc->res_map;
 422		ioc->res_bitshift = 0;
 423	} else {
 424		ioc->res_hint = res_ptr;
 425	}
 426	return (pide);
 427}
 428
 429
 430/**
 431 * sba_alloc_range - find free bits and mark them in IO PDIR resource bitmap
 432 * @ioc: IO MMU structure which owns the pdir we are interested in.
 433 * @dev: device for which pages should be alloced
 434 * @size: number of bytes to create a mapping for
 435 *
 436 * Given a size, find consecutive unmarked and then mark those bits in the
 437 * resource bit map.
 438 */
 439static int
 440sba_alloc_range(struct ioc *ioc, struct device *dev, size_t size)
 441{
 442	unsigned int pages_needed = size >> IOVP_SHIFT;
 443#ifdef SBA_COLLECT_STATS
 444	unsigned long cr_start = mfctl(16);
 445#endif
 446	unsigned long pide;
 447
 448	pide = sba_search_bitmap(ioc, dev, pages_needed);
 449	if (pide >= (ioc->res_size << 3)) {
 450		pide = sba_search_bitmap(ioc, dev, pages_needed);
 451		if (pide >= (ioc->res_size << 3))
 452			panic("%s: I/O MMU @ %p is out of mapping resources\n",
 453			      __FILE__, ioc->ioc_hpa);
 454	}
 455
 456#ifdef ASSERT_PDIR_SANITY
 457	/* verify the first enable bit is clear */
 458	if(0x00 != ((u8 *) ioc->pdir_base)[pide*sizeof(u64) + 7]) {
 459		sba_dump_pdir_entry(ioc, "sba_search_bitmap() botched it?", pide);
 460	}
 461#endif
 462
 463	DBG_RES("%s(%x) %d -> %lx hint %x/%x\n",
 464		__func__, size, pages_needed, pide,
 465		(uint) ((unsigned long) ioc->res_hint - (unsigned long) ioc->res_map),
 466		ioc->res_bitshift );
 467
 468#ifdef SBA_COLLECT_STATS
 469	{
 470		unsigned long cr_end = mfctl(16);
 471		unsigned long tmp = cr_end - cr_start;
 472		/* check for roll over */
 473		cr_start = (cr_end < cr_start) ?  -(tmp) : (tmp);
 474	}
 475	ioc->avg_search[ioc->avg_idx++] = cr_start;
 476	ioc->avg_idx &= SBA_SEARCH_SAMPLE - 1;
 477
 478	ioc->used_pages += pages_needed;
 479#endif
 480
 481	return (pide);
 482}
 483
 484
 485/**
 486 * sba_free_range - unmark bits in IO PDIR resource bitmap
 487 * @ioc: IO MMU structure which owns the pdir we are interested in.
 488 * @iova: IO virtual address which was previously allocated.
 489 * @size: number of bytes to create a mapping for
 490 *
 491 * clear bits in the ioc's resource map
 492 */
 493static void
 494sba_free_range(struct ioc *ioc, dma_addr_t iova, size_t size)
 495{
 496	unsigned long iovp = SBA_IOVP(ioc, iova);
 497	unsigned int pide = PDIR_INDEX(iovp);
 498	unsigned int ridx = pide >> 3;	/* convert bit to byte address */
 499	unsigned long *res_ptr = (unsigned long *) &((ioc)->res_map[ridx & ~RESMAP_IDX_MASK]);
 500
 501	int bits_not_wanted = size >> IOVP_SHIFT;
 502
 503	/* 3-bits "bit" address plus 2 (or 3) bits for "byte" == bit in word */
 504	unsigned long m = RESMAP_MASK(bits_not_wanted) >> (pide & (BITS_PER_LONG - 1));
 505
 506	DBG_RES("%s( ,%x,%x) %x/%lx %x %p %lx\n",
 507		__func__, (uint) iova, size,
 508		bits_not_wanted, m, pide, res_ptr, *res_ptr);
 509
 510#ifdef SBA_COLLECT_STATS
 511	ioc->used_pages -= bits_not_wanted;
 512#endif
 513
 514	*res_ptr &= ~m;
 515}
 516
 517
 518/**************************************************************
 519*
 520*   "Dynamic DMA Mapping" support (aka "Coherent I/O")
 521*
 522***************************************************************/
 523
 524#ifdef SBA_HINT_SUPPORT
 525#define SBA_DMA_HINT(ioc, val) ((val) << (ioc)->hint_shift_pdir)
 526#endif
 527
 528typedef unsigned long space_t;
 529#define KERNEL_SPACE 0
 530
 531/**
 532 * sba_io_pdir_entry - fill in one IO PDIR entry
 533 * @pdir_ptr:  pointer to IO PDIR entry
 534 * @sid: process Space ID - currently only support KERNEL_SPACE
 535 * @vba: Virtual CPU address of buffer to map
 536 * @hint: DMA hint set to use for this mapping
 537 *
 538 * SBA Mapping Routine
 539 *
 540 * Given a virtual address (vba, arg2) and space id, (sid, arg1)
 541 * sba_io_pdir_entry() loads the I/O PDIR entry pointed to by
 542 * pdir_ptr (arg0). 
 543 * Using the bass-ackwards HP bit numbering, Each IO Pdir entry
 544 * for Astro/Ike looks like:
 545 *
 546 *
 547 *  0                    19                                 51   55       63
 548 * +-+---------------------+----------------------------------+----+--------+
 549 * |V|        U            |            PPN[43:12]            | U  |   VI   |
 550 * +-+---------------------+----------------------------------+----+--------+
 551 *
 552 * Pluto is basically identical, supports fewer physical address bits:
 553 *
 554 *  0                       23                              51   55       63
 555 * +-+------------------------+-------------------------------+----+--------+
 556 * |V|        U               |         PPN[39:12]            | U  |   VI   |
 557 * +-+------------------------+-------------------------------+----+--------+
 558 *
 559 *  V  == Valid Bit  (Most Significant Bit is bit 0)
 560 *  U  == Unused
 561 * PPN == Physical Page Number
 562 * VI  == Virtual Index (aka Coherent Index)
 563 *
 564 * LPA instruction output is put into PPN field.
 565 * LCI (Load Coherence Index) instruction provides the "VI" bits.
 566 *
 567 * We pre-swap the bytes since PCX-W is Big Endian and the
 568 * IOMMU uses little endian for the pdir.
 569 */
 570
 571static void
 572sba_io_pdir_entry(__le64 *pdir_ptr, space_t sid, unsigned long vba,
 573		  unsigned long hint)
 574{
 575	u64 pa; /* physical address */
 576	register unsigned ci; /* coherent index */
 577
 578	pa = lpa(vba);
 579	pa &= IOVP_MASK;
 580
 581	asm("lci 0(%1), %0" : "=r" (ci) : "r" (vba));
 582	pa |= (ci >> PAGE_SHIFT) & 0xff;  /* move CI (8 bits) into lowest byte */
 583
 584	pa |= SBA_PDIR_VALID_BIT;	/* set "valid" bit */
 585	*pdir_ptr = cpu_to_le64(pa);	/* swap and store into I/O Pdir */
 586
 587	/*
 588	 * If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set
 589	 * (bit #61, big endian), we have to flush and sync every time
 590	 * IO-PDIR is changed in Ike/Astro.
 591	 */
 592	asm_io_fdc(pdir_ptr);
 593}
 594
 595
 596/**
 597 * sba_mark_invalid - invalidate one or more IO PDIR entries
 598 * @ioc: IO MMU structure which owns the pdir we are interested in.
 599 * @iova:  IO Virtual Address mapped earlier
 600 * @byte_cnt:  number of bytes this mapping covers.
 601 *
 602 * Marking the IO PDIR entry(ies) as Invalid and invalidate
 603 * corresponding IO TLB entry. The Ike PCOM (Purge Command Register)
 604 * is to purge stale entries in the IO TLB when unmapping entries.
 605 *
 606 * The PCOM register supports purging of multiple pages, with a minium
 607 * of 1 page and a maximum of 2GB. Hardware requires the address be
 608 * aligned to the size of the range being purged. The size of the range
 609 * must be a power of 2. The "Cool perf optimization" in the
 610 * allocation routine helps keep that true.
 611 */
 612static void
 613sba_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt)
 614{
 615	u32 iovp = (u32) SBA_IOVP(ioc,iova);
 616	__le64 *pdir_ptr = &ioc->pdir_base[PDIR_INDEX(iovp)];
 617
 618#ifdef ASSERT_PDIR_SANITY
 619	/* Assert first pdir entry is set.
 620	**
 621	** Even though this is a big-endian machine, the entries
 622	** in the iopdir are little endian. That's why we look at
 623	** the byte at +7 instead of at +0.
 624	*/
 625	if (0x80 != (((u8 *) pdir_ptr)[7])) {
 626		sba_dump_pdir_entry(ioc,"sba_mark_invalid()", PDIR_INDEX(iovp));
 627	}
 628#endif
 629
 630	if (byte_cnt > IOVP_SIZE)
 631	{
 632#if 0
 633		unsigned long entries_per_cacheline = ioc_needs_fdc ?
 634				L1_CACHE_ALIGN(((unsigned long) pdir_ptr))
 635					- (unsigned long) pdir_ptr;
 636				: 262144;
 637#endif
 638
 639		/* set "size" field for PCOM */
 640		iovp |= get_order(byte_cnt) + PAGE_SHIFT;
 641
 642		do {
 643			/* clear I/O Pdir entry "valid" bit first */
 644			((u8 *) pdir_ptr)[7] = 0;
 645			asm_io_fdc(pdir_ptr);
 646			if (ioc_needs_fdc) {
 647#if 0
 648				entries_per_cacheline = L1_CACHE_SHIFT - 3;
 649#endif
 650			}
 651			pdir_ptr++;
 652			byte_cnt -= IOVP_SIZE;
 653		} while (byte_cnt > IOVP_SIZE);
 654	} else
 655		iovp |= IOVP_SHIFT;     /* set "size" field for PCOM */
 656
 657	/*
 658	** clear I/O PDIR entry "valid" bit.
 659	** We have to R/M/W the cacheline regardless how much of the
 660	** pdir entry that we clobber.
 661	** The rest of the entry would be useful for debugging if we
 662	** could dump core on HPMC.
 663	*/
 664	((u8 *) pdir_ptr)[7] = 0;
 665	asm_io_fdc(pdir_ptr);
 666
 667	WRITE_REG( SBA_IOVA(ioc, iovp, 0, 0), ioc->ioc_hpa+IOC_PCOM);
 668}
 669
 670/**
 671 * sba_dma_supported - PCI driver can query DMA support
 672 * @dev: instance of PCI owned by the driver that's asking
 673 * @mask:  number of address bits this PCI device can handle
 674 *
 675 * See Documentation/core-api/dma-api-howto.rst
 676 */
 677static int sba_dma_supported( struct device *dev, u64 mask)
 678{
 679	struct ioc *ioc;
 680
 681	if (dev == NULL) {
 682		printk(KERN_ERR MODULE_NAME ": EISA/ISA/et al not supported\n");
 683		BUG();
 684		return(0);
 685	}
 686
 687	ioc = GET_IOC(dev);
 688	if (!ioc)
 689		return 0;
 690
 691	/*
 692	 * check if mask is >= than the current max IO Virt Address
 693	 * The max IO Virt address will *always* < 30 bits.
 694	 */
 695	return((int)(mask >= (ioc->ibase - 1 +
 696			(ioc->pdir_size / sizeof(u64) * IOVP_SIZE) )));
 697}
 698
 699
 700/**
 701 * sba_map_single - map one buffer and return IOVA for DMA
 702 * @dev: instance of PCI owned by the driver that's asking.
 703 * @addr:  driver buffer to map.
 704 * @size:  number of bytes to map in driver buffer.
 705 * @direction:  R/W or both.
 706 *
 707 * See Documentation/core-api/dma-api-howto.rst
 708 */
 709static dma_addr_t
 710sba_map_single(struct device *dev, void *addr, size_t size,
 711	       enum dma_data_direction direction)
 712{
 713	struct ioc *ioc;
 714	unsigned long flags; 
 715	dma_addr_t iovp;
 716	dma_addr_t offset;
 717	__le64 *pdir_start;
 718	int pide;
 719
 720	ioc = GET_IOC(dev);
 721	if (!ioc)
 722		return DMA_MAPPING_ERROR;
 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	asm_io_sync();
 769
 770#ifdef ASSERT_PDIR_SANITY
 771	sba_check_pdir(ioc,"Check after sba_map_single()");
 772#endif
 773	spin_unlock_irqrestore(&ioc->res_lock, flags);
 774
 775	/* form complete address */
 776	return SBA_IOVA(ioc, iovp, offset, DEFAULT_DMA_HINT_REG);
 777}
 778
 779
 780static dma_addr_t
 781sba_map_page(struct device *dev, struct page *page, unsigned long offset,
 782		size_t size, enum dma_data_direction direction,
 783		unsigned long attrs)
 784{
 785	return sba_map_single(dev, page_address(page) + offset, size,
 786			direction);
 787}
 788
 789
 790/**
 791 * sba_unmap_page - unmap one IOVA and free resources
 792 * @dev: instance of PCI owned by the driver that's asking.
 793 * @iova:  IOVA of driver buffer previously mapped.
 794 * @size:  number of bytes mapped in driver buffer.
 795 * @direction:  R/W or both.
 796 * @attrs: attributes
 797 *
 798 * See Documentation/core-api/dma-api-howto.rst
 799 */
 800static void
 801sba_unmap_page(struct device *dev, dma_addr_t iova, size_t size,
 802		enum dma_data_direction direction, unsigned long attrs)
 803{
 804	struct ioc *ioc;
 805#if DELAYED_RESOURCE_CNT > 0
 806	struct sba_dma_pair *d;
 807#endif
 808	unsigned long flags; 
 809	dma_addr_t offset;
 810
 811	DBG_RUN("%s() iovp 0x%lx/%x\n", __func__, (long) iova, size);
 812
 813	ioc = GET_IOC(dev);
 814	if (!ioc) {
 815		WARN_ON(!ioc);
 816		return;
 817	}
 818	offset = iova & ~IOVP_MASK;
 819	iova ^= offset;        /* clear offset bits */
 820	size += offset;
 821	size = ALIGN(size, IOVP_SIZE);
 822
 823	spin_lock_irqsave(&ioc->res_lock, flags);
 824
 825#ifdef SBA_COLLECT_STATS
 826	ioc->usingle_calls++;
 827	ioc->usingle_pages += size >> IOVP_SHIFT;
 828#endif
 829
 830	sba_mark_invalid(ioc, iova, size);
 831
 832#if DELAYED_RESOURCE_CNT > 0
 833	/* Delaying when we re-use a IO Pdir entry reduces the number
 834	 * of MMIO reads needed to flush writes to the PCOM register.
 835	 */
 836	d = &(ioc->saved[ioc->saved_cnt]);
 837	d->iova = iova;
 838	d->size = size;
 839	if (++(ioc->saved_cnt) >= DELAYED_RESOURCE_CNT) {
 840		int cnt = ioc->saved_cnt;
 841		while (cnt--) {
 842			sba_free_range(ioc, d->iova, d->size);
 843			d--;
 844		}
 845		ioc->saved_cnt = 0;
 846
 847		READ_REG(ioc->ioc_hpa+IOC_PCOM);	/* flush purges */
 848	}
 849#else /* DELAYED_RESOURCE_CNT == 0 */
 850	sba_free_range(ioc, iova, size);
 851
 852	/* If fdc's were issued, force fdc's to be visible now */
 853	asm_io_sync();
 854
 855	READ_REG(ioc->ioc_hpa+IOC_PCOM);	/* flush purges */
 856#endif /* DELAYED_RESOURCE_CNT == 0 */
 857
 858	spin_unlock_irqrestore(&ioc->res_lock, flags);
 859
 860	/* XXX REVISIT for 2.5 Linux - need syncdma for zero-copy support.
 861	** For Astro based systems this isn't a big deal WRT performance.
 862	** As long as 2.4 kernels copyin/copyout data from/to userspace,
 863	** we don't need the syncdma. The issue here is I/O MMU cachelines
 864	** are *not* coherent in all cases.  May be hwrev dependent.
 865	** Need to investigate more.
 866	asm volatile("syncdma");	
 867	*/
 868}
 869
 870
 871/**
 872 * sba_alloc - allocate/map shared mem for DMA
 873 * @hwdev: instance of PCI owned by the driver that's asking.
 874 * @size:  number of bytes mapped in driver buffer.
 875 * @dma_handle:  IOVA of new buffer.
 876 * @gfp: allocation flags
 877 * @attrs: attributes
 878 *
 879 * See Documentation/core-api/dma-api-howto.rst
 880 */
 881static void *sba_alloc(struct device *hwdev, size_t size, dma_addr_t *dma_handle,
 882		gfp_t gfp, unsigned long attrs)
 883{
 884	void *ret;
 885
 886	if (!hwdev) {
 887		/* only support PCI */
 888		*dma_handle = 0;
 889		return NULL;
 890	}
 891
 892        ret = (void *) __get_free_pages(gfp, get_order(size));
 893
 894	if (ret) {
 895		memset(ret, 0, size);
 896		*dma_handle = sba_map_single(hwdev, ret, size, 0);
 897	}
 898
 899	return ret;
 900}
 901
 902
 903/**
 904 * sba_free - free/unmap shared mem for DMA
 905 * @hwdev: instance of PCI owned by the driver that's asking.
 906 * @size:  number of bytes mapped in driver buffer.
 907 * @vaddr:  virtual address IOVA of "consistent" buffer.
 908 * @dma_handle:  IO virtual address of "consistent" buffer.
 909 * @attrs: attributes
 910 *
 911 * See Documentation/core-api/dma-api-howto.rst
 912 */
 913static void
 914sba_free(struct device *hwdev, size_t size, void *vaddr,
 915		    dma_addr_t dma_handle, unsigned long attrs)
 916{
 917	sba_unmap_page(hwdev, dma_handle, size, 0, 0);
 918	free_pages((unsigned long) vaddr, get_order(size));
 919}
 920
 921
 922/*
 923** Since 0 is a valid pdir_base index value, can't use that
 924** to determine if a value is valid or not. Use a flag to indicate
 925** the SG list entry contains a valid pdir index.
 926*/
 927#define PIDE_FLAG 0x80000000UL
 928
 929#ifdef SBA_COLLECT_STATS
 930#define IOMMU_MAP_STATS
 931#endif
 932#include "iommu-helpers.h"
 933
 934#ifdef DEBUG_LARGE_SG_ENTRIES
 935int dump_run_sg = 0;
 936#endif
 937
 938
 939/**
 940 * sba_map_sg - map Scatter/Gather list
 941 * @dev: instance of PCI owned by the driver that's asking.
 942 * @sglist:  array of buffer/length pairs
 943 * @nents:  number of entries in list
 944 * @direction:  R/W or both.
 945 * @attrs: attributes
 946 *
 947 * See Documentation/core-api/dma-api-howto.rst
 948 */
 949static int
 950sba_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
 951	   enum dma_data_direction direction, unsigned long attrs)
 952{
 953	struct ioc *ioc;
 954	int filled = 0;
 955	unsigned long flags;
 956
 957	DBG_RUN_SG("%s() START %d entries\n", __func__, nents);
 958
 959	ioc = GET_IOC(dev);
 960	if (!ioc)
 961		return -EINVAL;
 962
 963	/* Fast path single entry scatterlists. */
 964	if (nents == 1) {
 965		sg_dma_address(sglist) = sba_map_single(dev, sg_virt(sglist),
 966						sglist->length, direction);
 967		sg_dma_len(sglist)     = sglist->length;
 968		return 1;
 969	}
 970
 971	spin_lock_irqsave(&ioc->res_lock, flags);
 972
 973#ifdef ASSERT_PDIR_SANITY
 974	if (sba_check_pdir(ioc,"Check before sba_map_sg()"))
 975	{
 976		sba_dump_sg(ioc, sglist, nents);
 977		panic("Check before sba_map_sg()");
 978	}
 979#endif
 980
 981#ifdef SBA_COLLECT_STATS
 982	ioc->msg_calls++;
 983#endif
 984
 985	/*
 986	** First coalesce the chunks and allocate I/O pdir space
 987	**
 988	** If this is one DMA stream, we can properly map using the
 989	** correct virtual address associated with each DMA page.
 990	** w/o this association, we wouldn't have coherent DMA!
 991	** Access to the virtual address is what forces a two pass algorithm.
 992	*/
 993	iommu_coalesce_chunks(ioc, dev, sglist, nents, sba_alloc_range);
 994
 995	/*
 996	** Program the I/O Pdir
 997	**
 998	** map the virtual addresses to the I/O Pdir
 999	** o dma_address will contain the pdir index
1000	** o dma_len will contain the number of bytes to map 
1001	** o address contains the virtual address.
1002	*/
1003	filled = iommu_fill_pdir(ioc, sglist, nents, 0, sba_io_pdir_entry);
1004
1005	/* force FDC ops in io_pdir_entry() to be visible to IOMMU */
1006	asm_io_sync();
1007
1008#ifdef ASSERT_PDIR_SANITY
1009	if (sba_check_pdir(ioc,"Check after sba_map_sg()"))
1010	{
1011		sba_dump_sg(ioc, sglist, nents);
1012		panic("Check after sba_map_sg()\n");
1013	}
1014#endif
1015
1016	spin_unlock_irqrestore(&ioc->res_lock, flags);
1017
1018	DBG_RUN_SG("%s() DONE %d mappings\n", __func__, filled);
1019
1020	return filled;
1021}
1022
1023
1024/**
1025 * sba_unmap_sg - unmap Scatter/Gather list
1026 * @dev: instance of PCI owned by the driver that's asking.
1027 * @sglist:  array of buffer/length pairs
1028 * @nents:  number of entries in list
1029 * @direction:  R/W or both.
1030 * @attrs: attributes
1031 *
1032 * See Documentation/core-api/dma-api-howto.rst
1033 */
1034static void 
1035sba_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents,
1036	     enum dma_data_direction direction, unsigned long attrs)
1037{
1038	struct ioc *ioc;
1039#ifdef ASSERT_PDIR_SANITY
1040	unsigned long flags;
1041#endif
1042
1043	DBG_RUN_SG("%s() START %d entries,  %p,%x\n",
1044		__func__, nents, sg_virt(sglist), sglist->length);
1045
1046	ioc = GET_IOC(dev);
1047	if (!ioc) {
1048		WARN_ON(!ioc);
1049		return;
1050	}
1051
1052#ifdef SBA_COLLECT_STATS
1053	ioc->usg_calls++;
1054#endif
1055
1056#ifdef ASSERT_PDIR_SANITY
1057	spin_lock_irqsave(&ioc->res_lock, flags);
1058	sba_check_pdir(ioc,"Check before sba_unmap_sg()");
1059	spin_unlock_irqrestore(&ioc->res_lock, flags);
1060#endif
1061
1062	while (nents && sg_dma_len(sglist)) {
1063
1064		sba_unmap_page(dev, sg_dma_address(sglist), sg_dma_len(sglist),
1065				direction, 0);
1066#ifdef SBA_COLLECT_STATS
1067		ioc->usg_pages += ((sg_dma_address(sglist) & ~IOVP_MASK) + sg_dma_len(sglist) + IOVP_SIZE - 1) >> PAGE_SHIFT;
1068		ioc->usingle_calls--;	/* kluge since call is unmap_sg() */
1069#endif
1070		++sglist;
1071		nents--;
1072	}
1073
1074	DBG_RUN_SG("%s() DONE (nents %d)\n", __func__,  nents);
1075
1076#ifdef ASSERT_PDIR_SANITY
1077	spin_lock_irqsave(&ioc->res_lock, flags);
1078	sba_check_pdir(ioc,"Check after sba_unmap_sg()");
1079	spin_unlock_irqrestore(&ioc->res_lock, flags);
1080#endif
1081
1082}
1083
1084static const struct dma_map_ops sba_ops = {
1085	.dma_supported =	sba_dma_supported,
1086	.alloc =		sba_alloc,
1087	.free =			sba_free,
1088	.map_page =		sba_map_page,
1089	.unmap_page =		sba_unmap_page,
1090	.map_sg =		sba_map_sg,
1091	.unmap_sg =		sba_unmap_sg,
1092	.get_sgtable =		dma_common_get_sgtable,
1093	.alloc_pages_op =	dma_common_alloc_pages,
1094	.free_pages =		dma_common_free_pages,
1095};
1096
1097
1098/**************************************************************************
1099**
1100**   SBA PAT PDC support
1101**
1102**   o call pdc_pat_cell_module()
1103**   o store ranges in PCI "resource" structures
1104**
1105**************************************************************************/
1106
1107static void
1108sba_get_pat_resources(struct sba_device *sba_dev)
1109{
1110#if 0
1111/*
1112** TODO/REVISIT/FIXME: support for directed ranges requires calls to
1113**      PAT PDC to program the SBA/LBA directed range registers...this
1114**      burden may fall on the LBA code since it directly supports the
1115**      PCI subsystem. It's not clear yet. - ggg
1116*/
1117PAT_MOD(mod)->mod_info.mod_pages   = PAT_GET_MOD_PAGES(temp);
1118	FIXME : ???
1119PAT_MOD(mod)->mod_info.dvi         = PAT_GET_DVI(temp);
1120	Tells where the dvi bits are located in the address.
1121PAT_MOD(mod)->mod_info.ioc         = PAT_GET_IOC(temp);
1122	FIXME : ???
1123#endif
1124}
1125
1126
1127/**************************************************************
1128*
1129*   Initialization and claim
1130*
1131***************************************************************/
1132#define PIRANHA_ADDR_MASK	0x00160000UL /* bit 17,18,20 */
1133#define PIRANHA_ADDR_VAL	0x00060000UL /* bit 17,18 on */
1134static void *
1135sba_alloc_pdir(unsigned int pdir_size)
1136{
1137        unsigned long pdir_base;
1138	unsigned long pdir_order = get_order(pdir_size);
1139
1140	pdir_base = __get_free_pages(GFP_KERNEL, pdir_order);
1141	if (NULL == (void *) pdir_base)	{
1142		panic("%s() could not allocate I/O Page Table\n",
1143			__func__);
1144	}
1145
1146	/* If this is not PA8700 (PCX-W2)
1147	**	OR newer than ver 2.2
1148	**	OR in a system that doesn't need VINDEX bits from SBA,
1149	**
1150	** then we aren't exposed to the HW bug.
1151	*/
1152	if ( ((boot_cpu_data.pdc.cpuid >> 5) & 0x7f) != 0x13
1153			|| (boot_cpu_data.pdc.versions > 0x202)
1154			|| (boot_cpu_data.pdc.capabilities & 0x08L) )
1155		return (void *) pdir_base;
1156
1157	/*
1158	 * PA8700 (PCX-W2, aka piranha) silent data corruption fix
1159	 *
1160	 * An interaction between PA8700 CPU (Ver 2.2 or older) and
1161	 * Ike/Astro can cause silent data corruption. This is only
1162	 * a problem if the I/O PDIR is located in memory such that
1163	 * (little-endian)  bits 17 and 18 are on and bit 20 is off.
1164	 *
1165	 * Since the max IO Pdir size is 2MB, by cleverly allocating the
1166	 * right physical address, we can either avoid (IOPDIR <= 1MB)
1167	 * or minimize (2MB IO Pdir) the problem if we restrict the
1168	 * IO Pdir to a maximum size of 2MB-128K (1902K).
1169	 *
1170	 * Because we always allocate 2^N sized IO pdirs, either of the
1171	 * "bad" regions will be the last 128K if at all. That's easy
1172	 * to test for.
1173	 * 
1174	 */
1175	if (pdir_order <= (19-12)) {
1176		if (((virt_to_phys(pdir_base)+pdir_size-1) & PIRANHA_ADDR_MASK) == PIRANHA_ADDR_VAL) {
1177			/* allocate a new one on 512k alignment */
1178			unsigned long new_pdir = __get_free_pages(GFP_KERNEL, (19-12));
1179			/* release original */
1180			free_pages(pdir_base, pdir_order);
1181
1182			pdir_base = new_pdir;
1183
1184			/* release excess */
1185			while (pdir_order < (19-12)) {
1186				new_pdir += pdir_size;
1187				free_pages(new_pdir, pdir_order);
1188				pdir_order +=1;
1189				pdir_size <<=1;
1190			}
1191		}
1192	} else {
1193		/*
1194		** 1MB or 2MB Pdir
1195		** Needs to be aligned on an "odd" 1MB boundary.
1196		*/
1197		unsigned long new_pdir = __get_free_pages(GFP_KERNEL, pdir_order+1); /* 2 or 4MB */
1198
1199		/* release original */
1200		free_pages( pdir_base, pdir_order);
1201
1202		/* release first 1MB */
1203		free_pages(new_pdir, 20-12);
1204
1205		pdir_base = new_pdir + 1024*1024;
1206
1207		if (pdir_order > (20-12)) {
1208			/*
1209			** 2MB Pdir.
1210			**
1211			** Flag tells init_bitmap() to mark bad 128k as used
1212			** and to reduce the size by 128k.
1213			*/
1214			piranha_bad_128k = 1;
1215
1216			new_pdir += 3*1024*1024;
1217			/* release last 1MB */
1218			free_pages(new_pdir, 20-12);
1219
1220			/* release unusable 128KB */
1221			free_pages(new_pdir - 128*1024 , 17-12);
1222
1223			pdir_size -= 128*1024;
1224		}
1225	}
1226
1227	memset((void *) pdir_base, 0, pdir_size);
1228	return (void *) pdir_base;
1229}
1230
1231struct ibase_data_struct {
1232	struct ioc *ioc;
1233	int ioc_num;
1234};
1235
1236static int setup_ibase_imask_callback(struct device *dev, void *data)
1237{
 
 
1238	struct parisc_device *lba = to_parisc_device(dev);
1239	struct ibase_data_struct *ibd = data;
1240	int rope_num = (lba->hpa.start >> 13) & 0xf;
1241	if (rope_num >> 3 == ibd->ioc_num)
1242		lba_set_iregs(lba, ibd->ioc->ibase, ibd->ioc->imask);
1243	return 0;
1244}
1245
1246/* setup Mercury or Elroy IBASE/IMASK registers. */
1247static void 
1248setup_ibase_imask(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
1249{
1250	struct ibase_data_struct ibase_data = {
1251		.ioc		= ioc,
1252		.ioc_num	= ioc_num,
1253	};
1254
1255	device_for_each_child(&sba->dev, &ibase_data,
1256			      setup_ibase_imask_callback);
1257}
1258
1259#ifdef SBA_AGP_SUPPORT
1260static int
1261sba_ioc_find_quicksilver(struct device *dev, void *data)
1262{
1263	int *agp_found = data;
1264	struct parisc_device *lba = to_parisc_device(dev);
1265
1266	if (IS_QUICKSILVER(lba))
1267		*agp_found = 1;
1268	return 0;
1269}
1270#endif
1271
1272static void
1273sba_ioc_init_pluto(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
1274{
1275	u32 iova_space_mask;
1276	u32 iova_space_size;
1277	int iov_order, tcnfg;
1278#ifdef SBA_AGP_SUPPORT
1279	int agp_found = 0;
1280#endif
1281	/*
1282	** Firmware programs the base and size of a "safe IOVA space"
1283	** (one that doesn't overlap memory or LMMIO space) in the
1284	** IBASE and IMASK registers.
1285	*/
1286	ioc->ibase = READ_REG(ioc->ioc_hpa + IOC_IBASE) & ~0x1fffffULL;
1287	iova_space_size = ~(READ_REG(ioc->ioc_hpa + IOC_IMASK) & 0xFFFFFFFFUL) + 1;
1288
1289	if ((ioc->ibase < 0xfed00000UL) && ((ioc->ibase + iova_space_size) > 0xfee00000UL)) {
1290		printk("WARNING: IOV space overlaps local config and interrupt message, truncating\n");
1291		iova_space_size /= 2;
1292	}
1293
1294	/*
1295	** iov_order is always based on a 1GB IOVA space since we want to
1296	** turn on the other half for AGP GART.
1297	*/
1298	iov_order = get_order(iova_space_size >> (IOVP_SHIFT - PAGE_SHIFT));
1299	ioc->pdir_size = (iova_space_size / IOVP_SIZE) * sizeof(u64);
1300
1301	DBG_INIT("%s() hpa 0x%p IOV %dMB (%d bits)\n",
1302		__func__, ioc->ioc_hpa, iova_space_size >> 20,
1303		iov_order + PAGE_SHIFT);
1304
1305	ioc->pdir_base = (void *) __get_free_pages(GFP_KERNEL,
1306						   get_order(ioc->pdir_size));
1307	if (!ioc->pdir_base)
1308		panic("Couldn't allocate I/O Page Table\n");
1309
1310	memset(ioc->pdir_base, 0, ioc->pdir_size);
1311
1312	DBG_INIT("%s() pdir %p size %x\n",
1313			__func__, ioc->pdir_base, ioc->pdir_size);
1314
1315#ifdef SBA_HINT_SUPPORT
1316	ioc->hint_shift_pdir = iov_order + PAGE_SHIFT;
1317	ioc->hint_mask_pdir = ~(0x3 << (iov_order + PAGE_SHIFT));
1318
1319	DBG_INIT("	hint_shift_pdir %x hint_mask_pdir %lx\n",
1320		ioc->hint_shift_pdir, ioc->hint_mask_pdir);
1321#endif
1322
1323	WARN_ON((((unsigned long) ioc->pdir_base) & PAGE_MASK) != (unsigned long) ioc->pdir_base);
1324	WRITE_REG(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE);
1325
1326	/* build IMASK for IOC and Elroy */
1327	iova_space_mask =  0xffffffff;
1328	iova_space_mask <<= (iov_order + PAGE_SHIFT);
1329	ioc->imask = iova_space_mask;
1330#ifdef ZX1_SUPPORT
1331	ioc->iovp_mask = ~(iova_space_mask + PAGE_SIZE - 1);
1332#endif
1333	sba_dump_tlb(ioc->ioc_hpa);
1334
1335	setup_ibase_imask(sba, ioc, ioc_num);
1336
1337	WRITE_REG(ioc->imask, ioc->ioc_hpa + IOC_IMASK);
1338
1339#ifdef CONFIG_64BIT
1340	/*
1341	** Setting the upper bits makes checking for bypass addresses
1342	** a little faster later on.
1343	*/
1344	ioc->imask |= 0xFFFFFFFF00000000UL;
1345#endif
1346
1347	/* Set I/O PDIR Page size to system page size */
1348	switch (PAGE_SHIFT) {
1349		case 12: tcnfg = 0; break;	/*  4K */
1350		case 13: tcnfg = 1; break;	/*  8K */
1351		case 14: tcnfg = 2; break;	/* 16K */
1352		case 16: tcnfg = 3; break;	/* 64K */
1353		default:
1354			panic(__FILE__ "Unsupported system page size %d",
1355				1 << PAGE_SHIFT);
1356			break;
1357	}
1358	WRITE_REG(tcnfg, ioc->ioc_hpa + IOC_TCNFG);
1359
1360	/*
1361	** Program the IOC's ibase and enable IOVA translation
1362	** Bit zero == enable bit.
1363	*/
1364	WRITE_REG(ioc->ibase | 1, ioc->ioc_hpa + IOC_IBASE);
1365
1366	/*
1367	** Clear I/O TLB of any possible entries.
1368	** (Yes. This is a bit paranoid...but so what)
1369	*/
1370	WRITE_REG(ioc->ibase | 31, ioc->ioc_hpa + IOC_PCOM);
1371
1372#ifdef SBA_AGP_SUPPORT
1373
1374	/*
1375	** If an AGP device is present, only use half of the IOV space
1376	** for PCI DMA.  Unfortunately we can't know ahead of time
1377	** whether GART support will actually be used, for now we
1378	** can just key on any AGP device found in the system.
1379	** We program the next pdir index after we stop w/ a key for
1380	** the GART code to handshake on.
1381	*/
1382	device_for_each_child(&sba->dev, &agp_found, sba_ioc_find_quicksilver);
1383
1384	if (agp_found && sba_reserve_agpgart) {
1385		printk(KERN_INFO "%s: reserving %dMb of IOVA space for agpgart\n",
1386		       __func__, (iova_space_size/2) >> 20);
1387		ioc->pdir_size /= 2;
1388		ioc->pdir_base[PDIR_INDEX(iova_space_size/2)] = SBA_AGPGART_COOKIE;
1389	}
1390#endif /*SBA_AGP_SUPPORT*/
1391}
1392
1393static void
1394sba_ioc_init(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
1395{
1396	u32 iova_space_size, iova_space_mask;
1397	unsigned int pdir_size, iov_order, tcnfg;
1398
1399	/*
1400	** Determine IOVA Space size from memory size.
1401	**
1402	** Ideally, PCI drivers would register the maximum number
1403	** of DMA they can have outstanding for each device they
1404	** own.  Next best thing would be to guess how much DMA
1405	** can be outstanding based on PCI Class/sub-class. Both
1406	** methods still require some "extra" to support PCI
1407	** Hot-Plug/Removal of PCI cards. (aka PCI OLARD).
1408	**
1409	** While we have 32-bits "IOVA" space, top two 2 bits are used
1410	** for DMA hints - ergo only 30 bits max.
1411	*/
1412
1413	iova_space_size = (u32) (totalram_pages()/global_ioc_cnt);
1414
1415	/* limit IOVA space size to 1MB-1GB */
1416	if (iova_space_size < (1 << (20 - PAGE_SHIFT))) {
1417		iova_space_size = 1 << (20 - PAGE_SHIFT);
1418	}
1419	else if (iova_space_size > (1 << (30 - PAGE_SHIFT))) {
1420		iova_space_size = 1 << (30 - PAGE_SHIFT);
1421	}
1422
1423	/*
1424	** iova space must be log2() in size.
1425	** thus, pdir/res_map will also be log2().
1426	** PIRANHA BUG: Exception is when IO Pdir is 2MB (gets reduced)
1427	*/
1428	iov_order = get_order(iova_space_size << PAGE_SHIFT);
1429
1430	/* iova_space_size is now bytes, not pages */
1431	iova_space_size = 1 << (iov_order + PAGE_SHIFT);
1432
1433	ioc->pdir_size = pdir_size = (iova_space_size/IOVP_SIZE) * sizeof(u64);
1434
1435	DBG_INIT("%s() hpa %px mem %ldMB IOV %dMB (%d bits)\n",
1436			__func__,
1437			ioc->ioc_hpa,
1438			(unsigned long) totalram_pages() >> (20 - PAGE_SHIFT),
1439			iova_space_size>>20,
1440			iov_order + PAGE_SHIFT);
1441
1442	ioc->pdir_base = sba_alloc_pdir(pdir_size);
1443
1444	DBG_INIT("%s() pdir %p size %x\n",
1445			__func__, ioc->pdir_base, pdir_size);
1446
1447#ifdef SBA_HINT_SUPPORT
1448	/* FIXME : DMA HINTs not used */
1449	ioc->hint_shift_pdir = iov_order + PAGE_SHIFT;
1450	ioc->hint_mask_pdir = ~(0x3 << (iov_order + PAGE_SHIFT));
1451
1452	DBG_INIT("	hint_shift_pdir %x hint_mask_pdir %lx\n",
1453			ioc->hint_shift_pdir, ioc->hint_mask_pdir);
1454#endif
1455
1456	WRITE_REG64(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE);
1457
1458	/* build IMASK for IOC and Elroy */
1459	iova_space_mask =  0xffffffff;
1460	iova_space_mask <<= (iov_order + PAGE_SHIFT);
1461
1462	/*
1463	** On C3000 w/512MB mem, HP-UX 10.20 reports:
1464	**     ibase=0, imask=0xFE000000, size=0x2000000.
1465	*/
1466	ioc->ibase = 0;
1467	ioc->imask = iova_space_mask;	/* save it */
1468#ifdef ZX1_SUPPORT
1469	ioc->iovp_mask = ~(iova_space_mask + PAGE_SIZE - 1);
1470#endif
1471
1472	DBG_INIT("%s() IOV base %#lx mask %#0lx\n",
1473		__func__, ioc->ibase, ioc->imask);
1474
1475	/*
1476	** FIXME: Hint registers are programmed with default hint
1477	** values during boot, so hints should be sane even if we
1478	** can't reprogram them the way drivers want.
1479	*/
1480
1481	setup_ibase_imask(sba, ioc, ioc_num);
1482
1483	/*
1484	** Program the IOC's ibase and enable IOVA translation
1485	*/
1486	WRITE_REG(ioc->ibase | 1, ioc->ioc_hpa+IOC_IBASE);
1487	WRITE_REG(ioc->imask, ioc->ioc_hpa+IOC_IMASK);
1488
1489	/* Set I/O PDIR Page size to system page size */
1490	switch (PAGE_SHIFT) {
1491		case 12: tcnfg = 0; break;	/*  4K */
1492		case 13: tcnfg = 1; break;	/*  8K */
1493		case 14: tcnfg = 2; break;	/* 16K */
1494		case 16: tcnfg = 3; break;	/* 64K */
1495		default:
1496			panic(__FILE__ "Unsupported system page size %d",
1497				1 << PAGE_SHIFT);
1498			break;
1499	}
1500	/* Set I/O PDIR Page size to PAGE_SIZE (4k/16k/...) */
1501	WRITE_REG(tcnfg, ioc->ioc_hpa+IOC_TCNFG);
1502
1503	/*
1504	** Clear I/O TLB of any possible entries.
1505	** (Yes. This is a bit paranoid...but so what)
1506	*/
1507	WRITE_REG(0 | 31, ioc->ioc_hpa+IOC_PCOM);
1508
1509	ioc->ibase = 0; /* used by SBA_IOVA and related macros */	
1510
1511	DBG_INIT("%s() DONE\n", __func__);
1512}
1513
1514
1515
1516/**************************************************************************
1517**
1518**   SBA initialization code (HW and SW)
1519**
1520**   o identify SBA chip itself
1521**   o initialize SBA chip modes (HardFail)
1522**   o initialize SBA chip modes (HardFail)
1523**   o FIXME: initialize DMA hints for reasonable defaults
1524**
1525**************************************************************************/
1526
1527static void __iomem *ioc_remap(struct sba_device *sba_dev, unsigned int offset)
1528{
1529	return ioremap(sba_dev->dev->hpa.start + offset, SBA_FUNC_SIZE);
1530}
1531
1532static void sba_hw_init(struct sba_device *sba_dev)
1533{ 
1534	int i;
1535	int num_ioc;
1536	u64 ioc_ctl;
1537
1538	if (!is_pdc_pat()) {
1539		/* Shutdown the USB controller on Astro-based workstations.
1540		** Once we reprogram the IOMMU, the next DMA performed by
1541		** USB will HPMC the box. USB is only enabled if a
1542		** keyboard is present and found.
1543		**
1544		** With serial console, j6k v5.0 firmware says:
1545		**   mem_kbd hpa 0xfee003f8 sba 0x0 pad 0x0 cl_class 0x7
1546		**
1547		** FIXME: Using GFX+USB console at power up but direct
1548		**	linux to serial console is still broken.
1549		**	USB could generate DMA so we must reset USB.
1550		**	The proper sequence would be:
1551		**	o block console output
1552		**	o reset USB device
1553		**	o reprogram serial port
1554		**	o unblock console output
1555		*/
1556		if (PAGE0->mem_kbd.cl_class == CL_KEYBD) {
1557			pdc_io_reset_devices();
1558		}
1559
1560	}
1561
1562
1563#if 0
1564printk("sba_hw_init(): mem_boot 0x%x 0x%x 0x%x 0x%x\n", PAGE0->mem_boot.hpa,
1565	PAGE0->mem_boot.spa, PAGE0->mem_boot.pad, PAGE0->mem_boot.cl_class);
1566
1567	/*
1568	** Need to deal with DMA from LAN.
1569	**	Maybe use page zero boot device as a handle to talk
1570	**	to PDC about which device to shutdown.
1571	**
1572	** Netbooting, j6k v5.0 firmware says:
1573	** 	mem_boot hpa 0xf4008000 sba 0x0 pad 0x0 cl_class 0x1002
1574	** ARGH! invalid class.
1575	*/
1576	if ((PAGE0->mem_boot.cl_class != CL_RANDOM)
1577		&& (PAGE0->mem_boot.cl_class != CL_SEQU)) {
1578			pdc_io_reset();
1579	}
1580#endif
1581
1582	if (!IS_PLUTO(sba_dev->dev)) {
1583		ioc_ctl = READ_REG(sba_dev->sba_hpa+IOC_CTRL);
1584		DBG_INIT("%s() hpa %px ioc_ctl 0x%Lx ->",
1585			__func__, sba_dev->sba_hpa, ioc_ctl);
1586		ioc_ctl &= ~(IOC_CTRL_RM | IOC_CTRL_NC | IOC_CTRL_CE);
1587		ioc_ctl |= IOC_CTRL_DD | IOC_CTRL_D4 | IOC_CTRL_TC;
1588			/* j6700 v1.6 firmware sets 0x294f */
1589			/* A500 firmware sets 0x4d */
1590
1591		WRITE_REG(ioc_ctl, sba_dev->sba_hpa+IOC_CTRL);
1592
1593#ifdef DEBUG_SBA_INIT
1594		ioc_ctl = READ_REG64(sba_dev->sba_hpa+IOC_CTRL);
1595		DBG_INIT(" 0x%Lx\n", ioc_ctl);
1596#endif
1597	} /* if !PLUTO */
1598
1599	if (IS_ASTRO(sba_dev->dev)) {
1600		int err;
1601		sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, ASTRO_IOC_OFFSET);
1602		num_ioc = 1;
1603
1604		sba_dev->chip_resv.name = "Astro Intr Ack";
1605		sba_dev->chip_resv.start = PCI_F_EXTEND | 0xfef00000UL;
1606		sba_dev->chip_resv.end   = PCI_F_EXTEND | (0xff000000UL - 1) ;
1607		err = request_resource(&iomem_resource, &(sba_dev->chip_resv));
1608		BUG_ON(err < 0);
1609
1610	} else if (IS_PLUTO(sba_dev->dev)) {
1611		int err;
1612
1613		sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, PLUTO_IOC_OFFSET);
1614		num_ioc = 1;
1615
1616		sba_dev->chip_resv.name = "Pluto Intr/PIOP/VGA";
1617		sba_dev->chip_resv.start = PCI_F_EXTEND | 0xfee00000UL;
1618		sba_dev->chip_resv.end   = PCI_F_EXTEND | (0xff200000UL - 1);
1619		err = request_resource(&iomem_resource, &(sba_dev->chip_resv));
1620		WARN_ON(err < 0);
1621
1622		sba_dev->iommu_resv.name = "IOVA Space";
1623		sba_dev->iommu_resv.start = 0x40000000UL;
1624		sba_dev->iommu_resv.end   = 0x50000000UL - 1;
1625		err = request_resource(&iomem_resource, &(sba_dev->iommu_resv));
1626		WARN_ON(err < 0);
1627	} else {
1628		/* IKE, REO */
1629		sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, IKE_IOC_OFFSET(0));
1630		sba_dev->ioc[1].ioc_hpa = ioc_remap(sba_dev, IKE_IOC_OFFSET(1));
1631		num_ioc = 2;
1632
1633		/* TODO - LOOKUP Ike/Stretch chipset mem map */
1634	}
1635	/* XXX: What about Reo Grande? */
1636
1637	sba_dev->num_ioc = num_ioc;
1638	for (i = 0; i < num_ioc; i++) {
1639		void __iomem *ioc_hpa = sba_dev->ioc[i].ioc_hpa;
1640		unsigned int j;
1641
1642		for (j=0; j < sizeof(u64) * ROPES_PER_IOC; j+=sizeof(u64)) {
1643
1644			/*
1645			 * Clear ROPE(N)_CONFIG AO bit.
1646			 * Disables "NT Ordering" (~= !"Relaxed Ordering")
1647			 * Overrides bit 1 in DMA Hint Sets.
1648			 * Improves netperf UDP_STREAM by ~10% for bcm5701.
1649			 */
1650			if (IS_PLUTO(sba_dev->dev)) {
1651				void __iomem *rope_cfg;
1652				unsigned long cfg_val;
1653
1654				rope_cfg = ioc_hpa + IOC_ROPE0_CFG + j;
1655				cfg_val = READ_REG(rope_cfg);
1656				cfg_val &= ~IOC_ROPE_AO;
1657				WRITE_REG(cfg_val, rope_cfg);
1658			}
1659
1660			/*
1661			** Make sure the box crashes on rope errors.
1662			*/
1663			WRITE_REG(HF_ENABLE, ioc_hpa + ROPE0_CTL + j);
1664		}
1665
1666		/* flush out the last writes */
1667		READ_REG(sba_dev->ioc[i].ioc_hpa + ROPE7_CTL);
1668
1669		DBG_INIT("	ioc[%d] ROPE_CFG %#lx  ROPE_DBG %lx\n",
1670				i,
1671				(unsigned long) READ_REG(sba_dev->ioc[i].ioc_hpa + 0x40),
1672				(unsigned long) READ_REG(sba_dev->ioc[i].ioc_hpa + 0x50)
1673			);
1674		DBG_INIT("	STATUS_CONTROL %#lx  FLUSH_CTRL %#lx\n",
1675				(unsigned long) READ_REG(sba_dev->ioc[i].ioc_hpa + 0x108),
1676				(unsigned long) READ_REG(sba_dev->ioc[i].ioc_hpa + 0x400)
1677			);
1678
1679		if (IS_PLUTO(sba_dev->dev)) {
1680			sba_ioc_init_pluto(sba_dev->dev, &(sba_dev->ioc[i]), i);
1681		} else {
1682			sba_ioc_init(sba_dev->dev, &(sba_dev->ioc[i]), i);
1683		}
1684	}
1685}
1686
1687static void
1688sba_common_init(struct sba_device *sba_dev)
1689{
1690	int i;
1691
1692	/* add this one to the head of the list (order doesn't matter)
1693	** This will be useful for debugging - especially if we get coredumps
1694	*/
1695	sba_dev->next = sba_list;
1696	sba_list = sba_dev;
1697
1698	for(i=0; i< sba_dev->num_ioc; i++) {
1699		int res_size;
1700#ifdef DEBUG_DMB_TRAP
1701		extern void iterate_pages(unsigned long , unsigned long ,
1702					  void (*)(pte_t * , unsigned long),
1703					  unsigned long );
1704		void set_data_memory_break(pte_t * , unsigned long);
1705#endif
1706		/* resource map size dictated by pdir_size */
1707		res_size = sba_dev->ioc[i].pdir_size/sizeof(u64); /* entries */
1708
1709		/* Second part of PIRANHA BUG */
1710		if (piranha_bad_128k) {
1711			res_size -= (128*1024)/sizeof(u64);
1712		}
1713
1714		res_size >>= 3;  /* convert bit count to byte count */
1715		DBG_INIT("%s() res_size 0x%x\n",
1716			__func__, res_size);
1717
1718		sba_dev->ioc[i].res_size = res_size;
1719		sba_dev->ioc[i].res_map = (char *) __get_free_pages(GFP_KERNEL, get_order(res_size));
1720
1721#ifdef DEBUG_DMB_TRAP
1722		iterate_pages( sba_dev->ioc[i].res_map, res_size,
1723				set_data_memory_break, 0);
1724#endif
1725
1726		if (NULL == sba_dev->ioc[i].res_map)
1727		{
1728			panic("%s:%s() could not allocate resource map\n",
1729			      __FILE__, __func__ );
1730		}
1731
1732		memset(sba_dev->ioc[i].res_map, 0, res_size);
1733		/* next available IOVP - circular search */
1734		sba_dev->ioc[i].res_hint = (unsigned long *)
1735				&(sba_dev->ioc[i].res_map[L1_CACHE_BYTES]);
1736
1737#ifdef ASSERT_PDIR_SANITY
1738		/* Mark first bit busy - ie no IOVA 0 */
1739		sba_dev->ioc[i].res_map[0] = 0x80;
1740		sba_dev->ioc[i].pdir_base[0] = (__force __le64) 0xeeffc0addbba0080ULL;
1741#endif
1742
1743		/* Third (and last) part of PIRANHA BUG */
1744		if (piranha_bad_128k) {
1745			/* region from +1408K to +1536 is un-usable. */
1746
1747			int idx_start = (1408*1024/sizeof(u64)) >> 3;
1748			int idx_end   = (1536*1024/sizeof(u64)) >> 3;
1749			long *p_start = (long *) &(sba_dev->ioc[i].res_map[idx_start]);
1750			long *p_end   = (long *) &(sba_dev->ioc[i].res_map[idx_end]);
1751
1752			/* mark that part of the io pdir busy */
1753			while (p_start < p_end)
1754				*p_start++ = -1;
1755				
1756		}
1757
1758#ifdef DEBUG_DMB_TRAP
1759		iterate_pages( sba_dev->ioc[i].res_map, res_size,
1760				set_data_memory_break, 0);
1761		iterate_pages( sba_dev->ioc[i].pdir_base, sba_dev->ioc[i].pdir_size,
1762				set_data_memory_break, 0);
1763#endif
1764
1765		DBG_INIT("%s() %d res_map %x %p\n",
1766			__func__, i, res_size, sba_dev->ioc[i].res_map);
1767	}
1768
1769	spin_lock_init(&sba_dev->sba_lock);
1770	ioc_needs_fdc = boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC;
1771
1772#ifdef DEBUG_SBA_INIT
1773	/*
1774	 * If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set
1775	 * (bit #61, big endian), we have to flush and sync every time
1776	 * IO-PDIR is changed in Ike/Astro.
1777	 */
1778	if (ioc_needs_fdc) {
1779		printk(KERN_INFO MODULE_NAME " FDC/SYNC required.\n");
1780	} else {
1781		printk(KERN_INFO MODULE_NAME " IOC has cache coherent PDIR.\n");
1782	}
1783#endif
1784}
1785
1786#ifdef CONFIG_PROC_FS
1787static int sba_proc_info(struct seq_file *m, void *p)
1788{
1789	struct sba_device *sba_dev = sba_list;
1790	struct ioc *ioc = &sba_dev->ioc[0];	/* FIXME: Multi-IOC support! */
1791	int total_pages = (int) (ioc->res_size << 3); /* 8 bits per byte */
1792#ifdef SBA_COLLECT_STATS
1793	unsigned long avg = 0, min, max;
1794#endif
1795	int i;
1796
1797	seq_printf(m, "%s rev %d.%d\n",
1798		   sba_dev->name,
1799		   (sba_dev->hw_rev & 0x7) + 1,
1800		   (sba_dev->hw_rev & 0x18) >> 3);
1801	seq_printf(m, "IO PDIR size    : %d bytes (%d entries)\n",
1802		   (int)((ioc->res_size << 3) * sizeof(u64)), /* 8 bits/byte */
1803		   total_pages);
1804
1805	seq_printf(m, "Resource bitmap : %d bytes (%d pages)\n",
1806		   ioc->res_size, ioc->res_size << 3);   /* 8 bits per byte */
1807
1808	seq_printf(m, "LMMIO_BASE/MASK/ROUTE %08x %08x %08x\n",
1809		   READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_BASE),
1810		   READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_MASK),
1811		   READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_ROUTE));
1812
1813	for (i=0; i<4; i++)
1814		seq_printf(m, "DIR%d_BASE/MASK/ROUTE %08x %08x %08x\n",
1815			   i,
1816			   READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_BASE  + i*0x18),
1817			   READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_MASK  + i*0x18),
1818			   READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_ROUTE + i*0x18));
1819
1820#ifdef SBA_COLLECT_STATS
1821	seq_printf(m, "IO PDIR entries : %ld free  %ld used (%d%%)\n",
1822		   total_pages - ioc->used_pages, ioc->used_pages,
1823		   (int)(ioc->used_pages * 100 / total_pages));
1824
1825	min = max = ioc->avg_search[0];
1826	for (i = 0; i < SBA_SEARCH_SAMPLE; i++) {
1827		avg += ioc->avg_search[i];
1828		if (ioc->avg_search[i] > max) max = ioc->avg_search[i];
1829		if (ioc->avg_search[i] < min) min = ioc->avg_search[i];
1830	}
1831	avg /= SBA_SEARCH_SAMPLE;
1832	seq_printf(m, "  Bitmap search : %ld/%ld/%ld (min/avg/max CPU Cycles)\n",
1833		   min, avg, max);
1834
1835	seq_printf(m, "pci_map_single(): %12ld calls  %12ld pages (avg %d/1000)\n",
1836		   ioc->msingle_calls, ioc->msingle_pages,
1837		   (int)((ioc->msingle_pages * 1000)/ioc->msingle_calls));
1838
1839	/* KLUGE - unmap_sg calls unmap_single for each mapped page */
1840	min = ioc->usingle_calls;
1841	max = ioc->usingle_pages - ioc->usg_pages;
1842	seq_printf(m, "pci_unmap_single: %12ld calls  %12ld pages (avg %d/1000)\n",
1843		   min, max, (int)((max * 1000)/min));
1844
1845	seq_printf(m, "pci_map_sg()    : %12ld calls  %12ld pages (avg %d/1000)\n",
1846		   ioc->msg_calls, ioc->msg_pages,
1847		   (int)((ioc->msg_pages * 1000)/ioc->msg_calls));
1848
1849	seq_printf(m, "pci_unmap_sg()  : %12ld calls  %12ld pages (avg %d/1000)\n",
1850		   ioc->usg_calls, ioc->usg_pages,
1851		   (int)((ioc->usg_pages * 1000)/ioc->usg_calls));
1852#endif
1853
1854	return 0;
1855}
1856
1857static int
1858sba_proc_bitmap_info(struct seq_file *m, void *p)
1859{
1860	struct sba_device *sba_dev = sba_list;
1861	struct ioc *ioc = &sba_dev->ioc[0];	/* FIXME: Multi-IOC support! */
1862
1863	seq_hex_dump(m, "   ", DUMP_PREFIX_NONE, 32, 4, ioc->res_map,
1864		     ioc->res_size, false);
1865	seq_putc(m, '\n');
1866
1867	return 0;
1868}
1869#endif /* CONFIG_PROC_FS */
1870
1871static const struct parisc_device_id sba_tbl[] __initconst = {
1872	{ HPHW_IOA, HVERSION_REV_ANY_ID, ASTRO_RUNWAY_PORT, 0xb },
1873	{ HPHW_BCPORT, HVERSION_REV_ANY_ID, IKE_MERCED_PORT, 0xc },
1874	{ HPHW_BCPORT, HVERSION_REV_ANY_ID, REO_MERCED_PORT, 0xc },
1875	{ HPHW_BCPORT, HVERSION_REV_ANY_ID, REOG_MERCED_PORT, 0xc },
1876	{ HPHW_IOA, HVERSION_REV_ANY_ID, PLUTO_MCKINLEY_PORT, 0xc },
1877	{ 0, }
1878};
1879
1880static int sba_driver_callback(struct parisc_device *);
1881
1882static struct parisc_driver sba_driver __refdata = {
1883	.name =		MODULE_NAME,
1884	.id_table =	sba_tbl,
1885	.probe =	sba_driver_callback,
1886};
1887
1888/*
1889** Determine if sba should claim this chip (return 0) or not (return 1).
1890** If so, initialize the chip and tell other partners in crime they
1891** have work to do.
1892*/
1893static int __init sba_driver_callback(struct parisc_device *dev)
1894{
1895	struct sba_device *sba_dev;
1896	u32 func_class;
1897	int i;
1898	char *version;
1899	void __iomem *sba_addr = ioremap(dev->hpa.start, SBA_FUNC_SIZE);
1900	struct proc_dir_entry *root __maybe_unused;
 
 
1901
1902	sba_dump_ranges(sba_addr);
1903
1904	/* Read HW Rev First */
1905	func_class = READ_REG(sba_addr + SBA_FCLASS);
1906
1907	if (IS_ASTRO(dev)) {
1908		unsigned long fclass;
1909		static char astro_rev[]="Astro ?.?";
1910
1911		/* Astro is broken...Read HW Rev First */
1912		fclass = READ_REG(sba_addr);
1913
1914		astro_rev[6] = '1' + (char) (fclass & 0x7);
1915		astro_rev[8] = '0' + (char) ((fclass & 0x18) >> 3);
1916		version = astro_rev;
1917
1918	} else if (IS_IKE(dev)) {
1919		static char ike_rev[] = "Ike rev ?";
1920		ike_rev[8] = '0' + (char) (func_class & 0xff);
1921		version = ike_rev;
1922	} else if (IS_PLUTO(dev)) {
1923		static char pluto_rev[]="Pluto ?.?";
1924		pluto_rev[6] = '0' + (char) ((func_class & 0xf0) >> 4); 
1925		pluto_rev[8] = '0' + (char) (func_class & 0x0f); 
1926		version = pluto_rev;
1927	} else {
1928		static char reo_rev[] = "REO rev ?";
1929		reo_rev[8] = '0' + (char) (func_class & 0xff);
1930		version = reo_rev;
1931	}
1932
1933	if (!global_ioc_cnt) {
1934		global_ioc_cnt = count_parisc_driver(&sba_driver);
1935
1936		/* Astro and Pluto have one IOC per SBA */
1937		if ((!IS_ASTRO(dev)) || (!IS_PLUTO(dev)))
1938			global_ioc_cnt *= 2;
1939	}
1940
1941	printk(KERN_INFO "%s found %s at 0x%llx\n",
1942		MODULE_NAME, version, (unsigned long long)dev->hpa.start);
1943
1944	sba_dev = kzalloc(sizeof(struct sba_device), GFP_KERNEL);
1945	if (!sba_dev) {
1946		printk(KERN_ERR MODULE_NAME " - couldn't alloc sba_device\n");
1947		return -ENOMEM;
1948	}
1949
1950	parisc_set_drvdata(dev, sba_dev);
1951
1952	for(i=0; i<MAX_IOC; i++)
1953		spin_lock_init(&(sba_dev->ioc[i].res_lock));
1954
1955	sba_dev->dev = dev;
1956	sba_dev->hw_rev = func_class;
1957	sba_dev->name = dev->name;
1958	sba_dev->sba_hpa = sba_addr;
1959
1960	sba_get_pat_resources(sba_dev);
1961	sba_hw_init(sba_dev);
1962	sba_common_init(sba_dev);
1963
1964	hppa_dma_ops = &sba_ops;
1965
 
1966	switch (dev->id.hversion) {
1967	case PLUTO_MCKINLEY_PORT:
1968		if (!proc_mckinley_root)
1969			proc_mckinley_root = proc_mkdir("bus/mckinley", NULL);
1970		root = proc_mckinley_root;
1971		break;
1972	case ASTRO_RUNWAY_PORT:
1973	case IKE_MERCED_PORT:
1974	default:
1975		if (!proc_runway_root)
1976			proc_runway_root = proc_mkdir("bus/runway", NULL);
1977		root = proc_runway_root;
1978		break;
1979	}
1980
1981	proc_create_single("sba_iommu", 0, root, sba_proc_info);
1982	proc_create_single("sba_iommu-bitmap", 0, root, sba_proc_bitmap_info);
 
1983	return 0;
1984}
1985
1986/*
1987** One time initialization to let the world know the SBA was found.
1988** This is the only routine which is NOT static.
1989** Must be called exactly once before pci_init().
1990*/
1991static int __init sba_init(void)
1992{
1993	return register_parisc_driver(&sba_driver);
1994}
1995arch_initcall(sba_init);
1996
1997
1998/**
1999 * sba_get_iommu - Assign the iommu pointer for the pci bus controller.
2000 * @pci_hba: The parisc device.
2001 *
2002 * Returns the appropriate IOMMU data for the given parisc PCI controller.
2003 * This is cached and used later for PCI DMA Mapping.
2004 */
2005void * sba_get_iommu(struct parisc_device *pci_hba)
2006{
2007	struct parisc_device *sba_dev = parisc_parent(pci_hba);
2008	struct sba_device *sba = dev_get_drvdata(&sba_dev->dev);
2009	char t = sba_dev->id.hw_type;
2010	int iocnum = (pci_hba->hw_path >> 3);	/* IOC # */
2011
2012	WARN_ON((t != HPHW_IOA) && (t != HPHW_BCPORT));
2013
2014	return &(sba->ioc[iocnum]);
2015}
2016
2017
2018/**
2019 * sba_directed_lmmio - return first directed LMMIO range routed to rope
2020 * @pci_hba: The parisc device.
2021 * @r: resource PCI host controller wants start/end fields assigned.
2022 *
2023 * For the given parisc PCI controller, determine if any direct ranges
2024 * are routed down the corresponding rope.
2025 */
2026void sba_directed_lmmio(struct parisc_device *pci_hba, struct resource *r)
2027{
2028	struct parisc_device *sba_dev = parisc_parent(pci_hba);
2029	struct sba_device *sba = dev_get_drvdata(&sba_dev->dev);
2030	char t = sba_dev->id.hw_type;
2031	int i;
2032	int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1));  /* rope # */
2033
2034	BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT));
2035
2036	r->start = r->end = 0;
2037
2038	/* Astro has 4 directed ranges. Not sure about Ike/Pluto/et al */
2039	for (i=0; i<4; i++) {
2040		int base, size;
2041		void __iomem *reg = sba->sba_hpa + i*0x18;
2042
2043		base = READ_REG32(reg + LMMIO_DIRECT0_BASE);
2044		if ((base & 1) == 0)
2045			continue;	/* not enabled */
2046
2047		size = READ_REG32(reg + LMMIO_DIRECT0_ROUTE);
2048
2049		if ((size & (ROPES_PER_IOC-1)) != rope)
2050			continue;	/* directed down different rope */
2051		
2052		r->start = (base & ~1UL) | PCI_F_EXTEND;
2053		size = ~ READ_REG32(reg + LMMIO_DIRECT0_MASK);
2054		r->end = r->start + size;
2055		r->flags = IORESOURCE_MEM;
2056	}
2057}
2058
2059
2060/**
2061 * sba_distributed_lmmio - return portion of distributed LMMIO range
2062 * @pci_hba: The parisc device.
2063 * @r: resource PCI host controller wants start/end fields assigned.
2064 *
2065 * For the given parisc PCI controller, return portion of distributed LMMIO
2066 * range. The distributed LMMIO is always present and it's just a question
2067 * of the base address and size of the range.
2068 */
2069void sba_distributed_lmmio(struct parisc_device *pci_hba, struct resource *r )
2070{
2071	struct parisc_device *sba_dev = parisc_parent(pci_hba);
2072	struct sba_device *sba = dev_get_drvdata(&sba_dev->dev);
2073	char t = sba_dev->id.hw_type;
2074	int base, size;
2075	int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1));  /* rope # */
2076
2077	BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT));
2078
2079	r->start = r->end = 0;
2080
2081	base = READ_REG32(sba->sba_hpa + LMMIO_DIST_BASE);
2082	if ((base & 1) == 0) {
2083		BUG();	/* Gah! Distr Range wasn't enabled! */
2084		return;
2085	}
2086
2087	r->start = (base & ~1UL) | PCI_F_EXTEND;
2088
2089	size = (~READ_REG32(sba->sba_hpa + LMMIO_DIST_MASK)) / ROPES_PER_IOC;
2090	r->start += rope * (size + 1);	/* adjust base for this rope */
2091	r->end = r->start + size;
2092	r->flags = IORESOURCE_MEM;
2093}