/*
  **  System Bus Adapter (SBA) I/O MMU manager
  **
  **	(c) Copyright 2000-2004 Grant Grundler <grundler @ parisc-linux x org>
  **	(c) Copyright 2004 Naresh Kumar Inna <knaresh at india x hp x com>
  **	(c) Copyright 2000-2004 Hewlett-Packard Company
  **
  **	Portions (c) 1999 Dave S. Miller (from sparc64 I/O MMU code)
  **
  **	This program is free software; you can redistribute it and/or modify
  **	it under the terms of the GNU General Public License as published by
  **      the Free Software Foundation; either version 2 of the License, or
  **      (at your option) any later version.
  **
  **
  ** This module initializes the IOC (I/O Controller) found on B1000/C3000/
  ** J5000/J7000/N-class/L-class machines and their successors.
  **
  ** FIXME: add DMA hint support programming in both sba and lba modules.
  */

  #include <linux/types.h>
  #include <linux/kernel.h>
  #include <linux/spinlock.h>
  #include <linux/slab.h>
  #include <linux/init.h>
  
  #include <linux/mm.h>
  #include <linux/string.h>
  #include <linux/pci.h>

  #include <linux/scatterlist.h>

  #include <linux/iommu-helper.h>

  
  #include <asm/byteorder.h>
  #include <asm/io.h>
  #include <asm/dma.h>		/* for DMA_CHUNK_SIZE */
  
  #include <asm/hardware.h>	/* for register_parisc_driver() stuff */
  
  #include <linux/proc_fs.h>

  #include <linux/seq_file.h>

  #include <linux/module.h>

  #include <asm/ropes.h>

  #include <asm/mckinley.h>	/* for proc_mckinley_root */

  #include <asm/runway.h>		/* for proc_runway_root */
  #include <asm/pdc.h>		/* for PDC_MODEL_* */
  #include <asm/pdcpat.h>		/* for is_pdc_pat() */
  #include <asm/parisc-device.h>

  #define MODULE_NAME "SBA"

  /*
  ** The number of debug flags is a clue - this code is fragile.
  ** Don't even think about messing with it unless you have
  ** plenty of 710's to sacrifice to the computer gods. :^)
  */
  #undef DEBUG_SBA_INIT
  #undef DEBUG_SBA_RUN
  #undef DEBUG_SBA_RUN_SG
  #undef DEBUG_SBA_RESOURCE
  #undef ASSERT_PDIR_SANITY
  #undef DEBUG_LARGE_SG_ENTRIES
  #undef DEBUG_DMB_TRAP
  
  #ifdef DEBUG_SBA_INIT
  #define DBG_INIT(x...)	printk(x)
  #else
  #define DBG_INIT(x...)
  #endif
  
  #ifdef DEBUG_SBA_RUN
  #define DBG_RUN(x...)	printk(x)
  #else
  #define DBG_RUN(x...)
  #endif
  
  #ifdef DEBUG_SBA_RUN_SG
  #define DBG_RUN_SG(x...)	printk(x)
  #else
  #define DBG_RUN_SG(x...)
  #endif
  
  
  #ifdef DEBUG_SBA_RESOURCE
  #define DBG_RES(x...)	printk(x)
  #else
  #define DBG_RES(x...)
  #endif

  #define SBA_INLINE	__inline__

  #define DEFAULT_DMA_HINT_REG	0

  struct sba_device *sba_list;
  EXPORT_SYMBOL_GPL(sba_list);

  
  static unsigned long ioc_needs_fdc = 0;
  
  /* global count of IOMMUs in the system */
  static unsigned int global_ioc_cnt = 0;
  
  /* PA8700 (Piranha 2.2) bug workaround */
  static unsigned long piranha_bad_128k = 0;
  
  /* Looks nice and keeps the compiler happy */
  #define SBA_DEV(d) ((struct sba_device *) (d))

  #ifdef CONFIG_AGP_PARISC
  #define SBA_AGP_SUPPORT
  #endif /*CONFIG_AGP_PARISC*/

  #ifdef SBA_AGP_SUPPORT

  static int sba_reserve_agpgart = 1;

  module_param(sba_reserve_agpgart, int, 0444);

  MODULE_PARM_DESC(sba_reserve_agpgart, "Reserve half of IO pdir as AGPGART");

  #endif

  
  /************************************
  ** SBA register read and write support
  **
  ** BE WARNED: register writes are posted.
  **  (ie follow writes which must reach HW with a read)
  **
  ** Superdome (in particular, REO) allows only 64-bit CSR accesses.
  */

  #define READ_REG32(addr)	readl(addr)
  #define READ_REG64(addr)	readq(addr)
  #define WRITE_REG32(val, addr)	writel((val), (addr))
  #define WRITE_REG64(val, addr)	writeq((val), (addr))

  #ifdef CONFIG_64BIT

  #define READ_REG(addr)		READ_REG64(addr)
  #define WRITE_REG(value, addr)	WRITE_REG64(value, addr)
  #else
  #define READ_REG(addr)		READ_REG32(addr)
  #define WRITE_REG(value, addr)	WRITE_REG32(value, addr)
  #endif
  
  #ifdef DEBUG_SBA_INIT

  /* NOTE: When CONFIG_64BIT isn't defined, READ_REG64() is two 32-bit reads */

  
  /**
   * sba_dump_ranges - debugging only - print ranges assigned to this IOA
   * @hpa: base address of the sba
   *
   * Print the MMIO and IO Port address ranges forwarded by an Astro/Ike/RIO
   * IO Adapter (aka Bus Converter).
   */
  static void
  sba_dump_ranges(void __iomem *hpa)
  {
  	DBG_INIT("SBA at 0x%p
  ", hpa);
  	DBG_INIT("IOS_DIST_BASE   : %Lx
  ", READ_REG64(hpa+IOS_DIST_BASE));
  	DBG_INIT("IOS_DIST_MASK   : %Lx
  ", READ_REG64(hpa+IOS_DIST_MASK));
  	DBG_INIT("IOS_DIST_ROUTE  : %Lx
  ", READ_REG64(hpa+IOS_DIST_ROUTE));
  	DBG_INIT("
  ");
  	DBG_INIT("IOS_DIRECT_BASE : %Lx
  ", READ_REG64(hpa+IOS_DIRECT_BASE));
  	DBG_INIT("IOS_DIRECT_MASK : %Lx
  ", READ_REG64(hpa+IOS_DIRECT_MASK));
  	DBG_INIT("IOS_DIRECT_ROUTE: %Lx
  ", READ_REG64(hpa+IOS_DIRECT_ROUTE));
  }
  
  /**
   * sba_dump_tlb - debugging only - print IOMMU operating parameters
   * @hpa: base address of the IOMMU
   *
   * Print the size/location of the IO MMU PDIR.
   */
  static void sba_dump_tlb(void __iomem *hpa)
  {
  	DBG_INIT("IO TLB at 0x%p
  ", hpa);
  	DBG_INIT("IOC_IBASE    : 0x%Lx
  ", READ_REG64(hpa+IOC_IBASE));
  	DBG_INIT("IOC_IMASK    : 0x%Lx
  ", READ_REG64(hpa+IOC_IMASK));
  	DBG_INIT("IOC_TCNFG    : 0x%Lx
  ", READ_REG64(hpa+IOC_TCNFG));
  	DBG_INIT("IOC_PDIR_BASE: 0x%Lx
  ", READ_REG64(hpa+IOC_PDIR_BASE));
  	DBG_INIT("
  ");
  }
  #else
  #define sba_dump_ranges(x)
  #define sba_dump_tlb(x)

  #endif	/* DEBUG_SBA_INIT */

  
  
  #ifdef ASSERT_PDIR_SANITY
  
  /**
   * sba_dump_pdir_entry - debugging only - print one IOMMU PDIR entry
   * @ioc: IO MMU structure which owns the pdir we are interested in.
   * @msg: text to print ont the output line.
   * @pide: pdir index.
   *
   * Print one entry of the IO MMU PDIR in human readable form.
   */
  static void
  sba_dump_pdir_entry(struct ioc *ioc, char *msg, uint pide)
  {
  	/* start printing from lowest pde in rval */
  	u64 *ptr = &(ioc->pdir_base[pide & (~0U * BITS_PER_LONG)]);
  	unsigned long *rptr = (unsigned long *) &(ioc->res_map[(pide >>3) & ~(sizeof(unsigned long) - 1)]);
  	uint rcnt;
  
  	printk(KERN_DEBUG "SBA: %s rp %p bit %d rval 0x%lx
  ",
  		 msg,
  		 rptr, pide & (BITS_PER_LONG - 1), *rptr);
  
  	rcnt = 0;
  	while (rcnt < BITS_PER_LONG) {
  		printk(KERN_DEBUG "%s %2d %p %016Lx
  ",
  			(rcnt == (pide & (BITS_PER_LONG - 1)))
  				? "    -->" : "       ",
  			rcnt, ptr, *ptr );
  		rcnt++;
  		ptr++;
  	}
  	printk(KERN_DEBUG "%s", msg);
  }
  
  
  /**
   * sba_check_pdir - debugging only - consistency checker
   * @ioc: IO MMU structure which owns the pdir we are interested in.
   * @msg: text to print ont the output line.
   *
   * Verify the resource map and pdir state is consistent
   */
  static int
  sba_check_pdir(struct ioc *ioc, char *msg)
  {
  	u32 *rptr_end = (u32 *) &(ioc->res_map[ioc->res_size]);
  	u32 *rptr = (u32 *) ioc->res_map;	/* resource map ptr */
  	u64 *pptr = ioc->pdir_base;	/* pdir ptr */
  	uint pide = 0;
  
  	while (rptr < rptr_end) {
  		u32 rval = *rptr;
  		int rcnt = 32;	/* number of bits we might check */
  
  		while (rcnt) {
  			/* Get last byte and highest bit from that */
  			u32 pde = ((u32) (((char *)pptr)[7])) << 24;
  			if ((rval ^ pde) & 0x80000000)
  			{
  				/*
  				** BUMMER!  -- res_map != pdir --
  				** Dump rval and matching pdir entries
  				*/
  				sba_dump_pdir_entry(ioc, msg, pide);
  				return(1);
  			}
  			rcnt--;
  			rval <<= 1;	/* try the next bit */
  			pptr++;
  			pide++;
  		}
  		rptr++;	/* look at next word of res_map */
  	}
  	/* It'd be nice if we always got here :^) */
  	return 0;
  }
  
  
  /**
   * sba_dump_sg - debugging only - print Scatter-Gather list
   * @ioc: IO MMU structure which owns the pdir we are interested in.
   * @startsg: head of the SG list
   * @nents: number of entries in SG list
   *
   * print the SG list so we can verify it's correct by hand.
   */
  static void
  sba_dump_sg( struct ioc *ioc, struct scatterlist *startsg, int nents)
  {
  	while (nents-- > 0) {
  		printk(KERN_DEBUG " %d : %08lx/%05x %p/%05x
  ",
  				nents,
  				(unsigned long) sg_dma_address(startsg),
  				sg_dma_len(startsg),
  				sg_virt_addr(startsg), startsg->length);
  		startsg++;
  	}
  }
  
  #endif /* ASSERT_PDIR_SANITY */
  
  
  
  
  /**************************************************************
  *
  *   I/O Pdir Resource Management
  *
  *   Bits set in the resource map are in use.
  *   Each bit can represent a number of pages.
  *   LSbs represent lower addresses (IOVA's).
  *
  ***************************************************************/
  #define PAGES_PER_RANGE 1	/* could increase this to 4 or 8 if needed */
  
  /* Convert from IOVP to IOVA and vice versa. */
  
  #ifdef ZX1_SUPPORT
  /* Pluto (aka ZX1) boxes need to set or clear the ibase bits appropriately */
  #define SBA_IOVA(ioc,iovp,offset,hint_reg) ((ioc->ibase) | (iovp) | (offset))
  #define SBA_IOVP(ioc,iova) ((iova) & (ioc)->iovp_mask)
  #else
  /* only support Astro and ancestors. Saves a few cycles in key places */
  #define SBA_IOVA(ioc,iovp,offset,hint_reg) ((iovp) | (offset))
  #define SBA_IOVP(ioc,iova) (iova)
  #endif
  
  #define PDIR_INDEX(iovp)   ((iovp)>>IOVP_SHIFT)
  
  #define RESMAP_MASK(n)    (~0UL << (BITS_PER_LONG - (n)))
  #define RESMAP_IDX_MASK   (sizeof(unsigned long) - 1)

  static unsigned long ptr_to_pide(struct ioc *ioc, unsigned long *res_ptr,
  				 unsigned int bitshiftcnt)

  {
  	return (((unsigned long)res_ptr - (unsigned long)ioc->res_map) << 3)
  		+ bitshiftcnt;
  }

  
  /**
   * sba_search_bitmap - find free space in IO PDIR resource bitmap
   * @ioc: IO MMU structure which owns the pdir we are interested in.
   * @bits_wanted: number of entries we need.
   *
   * Find consecutive free bits in resource bitmap.
   * Each bit represents one entry in the IO Pdir.
   * Cool perf optimization: search for log2(size) bits at a time.
   */
  static SBA_INLINE unsigned long

  sba_search_bitmap(struct ioc *ioc, struct device *dev,
  		  unsigned long bits_wanted)

  {
  	unsigned long *res_ptr = ioc->res_hint;
  	unsigned long *res_end = (unsigned long *) &(ioc->res_map[ioc->res_size]);

  	unsigned long pide = ~0UL, tpide;
  	unsigned long boundary_size;
  	unsigned long shift;
  	int ret;

  	boundary_size = ALIGN((unsigned long long)dma_get_seg_boundary(dev) + 1,
  			      1ULL << IOVP_SHIFT) >> IOVP_SHIFT;

  
  #if defined(ZX1_SUPPORT)
  	BUG_ON(ioc->ibase & ~IOVP_MASK);
  	shift = ioc->ibase >> IOVP_SHIFT;
  #else
  	shift = 0;
  #endif

  
  	if (bits_wanted > (BITS_PER_LONG/2)) {
  		/* Search word at a time - no mask needed */
  		for(; res_ptr < res_end; ++res_ptr) {

  			tpide = ptr_to_pide(ioc, res_ptr, 0);
  			ret = iommu_is_span_boundary(tpide, bits_wanted,
  						     shift,
  						     boundary_size);
  			if ((*res_ptr == 0) && !ret) {

  				*res_ptr = RESMAP_MASK(bits_wanted);

  				pide = tpide;

  				break;
  			}
  		}
  		/* point to the next word on next pass */
  		res_ptr++;
  		ioc->res_bitshift = 0;
  	} else {
  		/*
  		** Search the resource bit map on well-aligned values.
  		** "o" is the alignment.
  		** We need the alignment to invalidate I/O TLB using
  		** SBA HW features in the unmap path.
  		*/
  		unsigned long o = 1 << get_order(bits_wanted << PAGE_SHIFT);

  		uint bitshiftcnt = ALIGN(ioc->res_bitshift, o);

  		unsigned long mask;
  
  		if (bitshiftcnt >= BITS_PER_LONG) {
  			bitshiftcnt = 0;
  			res_ptr++;
  		}
  		mask = RESMAP_MASK(bits_wanted) >> bitshiftcnt;

  		DBG_RES("%s() o %ld %p", __func__, o, res_ptr);

  		while(res_ptr < res_end)
  		{ 
  			DBG_RES("    %p %lx %lx
  ", res_ptr, mask, *res_ptr);
  			WARN_ON(mask == 0);

  			tpide = ptr_to_pide(ioc, res_ptr, bitshiftcnt);
  			ret = iommu_is_span_boundary(tpide, bits_wanted,
  						     shift,
  						     boundary_size);
  			if ((((*res_ptr) & mask) == 0) && !ret) {

  				*res_ptr |= mask;     /* mark resources busy! */

  				pide = tpide;

  				break;
  			}
  			mask >>= o;
  			bitshiftcnt += o;
  			if (mask == 0) {
  				mask = RESMAP_MASK(bits_wanted);
  				bitshiftcnt=0;
  				res_ptr++;
  			}
  		}
  		/* look in the same word on the next pass */
  		ioc->res_bitshift = bitshiftcnt + bits_wanted;
  	}
  
  	/* wrapped ? */
  	if (res_end <= res_ptr) {
  		ioc->res_hint = (unsigned long *) ioc->res_map;
  		ioc->res_bitshift = 0;
  	} else {
  		ioc->res_hint = res_ptr;
  	}
  	return (pide);
  }
  
  
  /**
   * sba_alloc_range - find free bits and mark them in IO PDIR resource bitmap
   * @ioc: IO MMU structure which owns the pdir we are interested in.
   * @size: number of bytes to create a mapping for
   *
   * Given a size, find consecutive unmarked and then mark those bits in the
   * resource bit map.
   */
  static int

  sba_alloc_range(struct ioc *ioc, struct device *dev, size_t size)

  {
  	unsigned int pages_needed = size >> IOVP_SHIFT;
  #ifdef SBA_COLLECT_STATS
  	unsigned long cr_start = mfctl(16);
  #endif
  	unsigned long pide;

  	pide = sba_search_bitmap(ioc, dev, pages_needed);

  	if (pide >= (ioc->res_size << 3)) {

  		pide = sba_search_bitmap(ioc, dev, pages_needed);

  		if (pide >= (ioc->res_size << 3))
  			panic("%s: I/O MMU @ %p is out of mapping resources
  ",
  			      __FILE__, ioc->ioc_hpa);
  	}
  
  #ifdef ASSERT_PDIR_SANITY
  	/* verify the first enable bit is clear */
  	if(0x00 != ((u8 *) ioc->pdir_base)[pide*sizeof(u64) + 7]) {
  		sba_dump_pdir_entry(ioc, "sba_search_bitmap() botched it?", pide);
  	}
  #endif
  
  	DBG_RES("%s(%x) %d -> %lx hint %x/%x
  ",

  		__func__, size, pages_needed, pide,

  		(uint) ((unsigned long) ioc->res_hint - (unsigned long) ioc->res_map),
  		ioc->res_bitshift );
  
  #ifdef SBA_COLLECT_STATS
  	{
  		unsigned long cr_end = mfctl(16);
  		unsigned long tmp = cr_end - cr_start;
  		/* check for roll over */
  		cr_start = (cr_end < cr_start) ?  -(tmp) : (tmp);
  	}
  	ioc->avg_search[ioc->avg_idx++] = cr_start;
  	ioc->avg_idx &= SBA_SEARCH_SAMPLE - 1;
  
  	ioc->used_pages += pages_needed;
  #endif
  
  	return (pide);
  }
  
  
  /**
   * sba_free_range - unmark bits in IO PDIR resource bitmap
   * @ioc: IO MMU structure which owns the pdir we are interested in.
   * @iova: IO virtual address which was previously allocated.
   * @size: number of bytes to create a mapping for
   *
   * clear bits in the ioc's resource map
   */
  static SBA_INLINE void
  sba_free_range(struct ioc *ioc, dma_addr_t iova, size_t size)
  {
  	unsigned long iovp = SBA_IOVP(ioc, iova);
  	unsigned int pide = PDIR_INDEX(iovp);
  	unsigned int ridx = pide >> 3;	/* convert bit to byte address */
  	unsigned long *res_ptr = (unsigned long *) &((ioc)->res_map[ridx & ~RESMAP_IDX_MASK]);
  
  	int bits_not_wanted = size >> IOVP_SHIFT;
  
  	/* 3-bits "bit" address plus 2 (or 3) bits for "byte" == bit in word */
  	unsigned long m = RESMAP_MASK(bits_not_wanted) >> (pide & (BITS_PER_LONG - 1));
  
  	DBG_RES("%s( ,%x,%x) %x/%lx %x %p %lx
  ",

  		__func__, (uint) iova, size,

  		bits_not_wanted, m, pide, res_ptr, *res_ptr);
  
  #ifdef SBA_COLLECT_STATS
  	ioc->used_pages -= bits_not_wanted;
  #endif
  
  	*res_ptr &= ~m;
  }
  
  
  /**************************************************************
  *
  *   "Dynamic DMA Mapping" support (aka "Coherent I/O")
  *
  ***************************************************************/

  #ifdef SBA_HINT_SUPPORT

  #define SBA_DMA_HINT(ioc, val) ((val) << (ioc)->hint_shift_pdir)
  #endif
  
  typedef unsigned long space_t;
  #define KERNEL_SPACE 0
  
  /**
   * sba_io_pdir_entry - fill in one IO PDIR entry
   * @pdir_ptr:  pointer to IO PDIR entry
   * @sid: process Space ID - currently only support KERNEL_SPACE
   * @vba: Virtual CPU address of buffer to map
   * @hint: DMA hint set to use for this mapping
   *
   * SBA Mapping Routine
   *
   * Given a virtual address (vba, arg2) and space id, (sid, arg1)
   * sba_io_pdir_entry() loads the I/O PDIR entry pointed to by
   * pdir_ptr (arg0). 
   * Using the bass-ackwards HP bit numbering, Each IO Pdir entry
   * for Astro/Ike looks like:
   *
   *
   *  0                    19                                 51   55       63
   * +-+---------------------+----------------------------------+----+--------+
   * |V|        U            |            PPN[43:12]            | U  |   VI   |
   * +-+---------------------+----------------------------------+----+--------+
   *
   * Pluto is basically identical, supports fewer physical address bits:
   *
   *  0                       23                              51   55       63
   * +-+------------------------+-------------------------------+----+--------+
   * |V|        U               |         PPN[39:12]            | U  |   VI   |
   * +-+------------------------+-------------------------------+----+--------+
   *
   *  V  == Valid Bit  (Most Significant Bit is bit 0)
   *  U  == Unused
   * PPN == Physical Page Number
   * VI  == Virtual Index (aka Coherent Index)
   *
   * LPA instruction output is put into PPN field.
   * LCI (Load Coherence Index) instruction provides the "VI" bits.
   *
   * We pre-swap the bytes since PCX-W is Big Endian and the
   * IOMMU uses little endian for the pdir.
   */

  static void SBA_INLINE

  sba_io_pdir_entry(u64 *pdir_ptr, space_t sid, unsigned long vba,
  		  unsigned long hint)
  {
  	u64 pa; /* physical address */
  	register unsigned ci; /* coherent index */
  
  	pa = virt_to_phys(vba);
  	pa &= IOVP_MASK;
  
  	mtsp(sid,1);
  	asm("lci 0(%%sr1, %1), %0" : "=r" (ci) : "r" (vba));
  	pa |= (ci >> 12) & 0xff;  /* move CI (8 bits) into lowest byte */

  	pa |= SBA_PDIR_VALID_BIT;	/* set "valid" bit */

  	*pdir_ptr = cpu_to_le64(pa);	/* swap and store into I/O Pdir */
  
  	/*
  	 * If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set
  	 * (bit #61, big endian), we have to flush and sync every time
  	 * IO-PDIR is changed in Ike/Astro.
  	 */

  	if (ioc_needs_fdc)
  		asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));

  }
  
  
  /**
   * sba_mark_invalid - invalidate one or more IO PDIR entries
   * @ioc: IO MMU structure which owns the pdir we are interested in.
   * @iova:  IO Virtual Address mapped earlier
   * @byte_cnt:  number of bytes this mapping covers.
   *
   * Marking the IO PDIR entry(ies) as Invalid and invalidate
   * corresponding IO TLB entry. The Ike PCOM (Purge Command Register)
   * is to purge stale entries in the IO TLB when unmapping entries.
   *
   * The PCOM register supports purging of multiple pages, with a minium
   * of 1 page and a maximum of 2GB. Hardware requires the address be
   * aligned to the size of the range being purged. The size of the range
   * must be a power of 2. The "Cool perf optimization" in the
   * allocation routine helps keep that true.
   */
  static SBA_INLINE void
  sba_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt)
  {
  	u32 iovp = (u32) SBA_IOVP(ioc,iova);

  	u64 *pdir_ptr = &ioc->pdir_base[PDIR_INDEX(iovp)];

  
  #ifdef ASSERT_PDIR_SANITY

  	/* Assert first pdir entry is set.
  	**
  	** Even though this is a big-endian machine, the entries
  	** in the iopdir are little endian. That's why we look at
  	** the byte at +7 instead of at +0.
  	*/
  	if (0x80 != (((u8 *) pdir_ptr)[7])) {

  		sba_dump_pdir_entry(ioc,"sba_mark_invalid()", PDIR_INDEX(iovp));
  	}
  #endif

  	if (byte_cnt > IOVP_SIZE)

  	{

  #if 0
  		unsigned long entries_per_cacheline = ioc_needs_fdc ?
  				L1_CACHE_ALIGN(((unsigned long) pdir_ptr))
  					- (unsigned long) pdir_ptr;
  				: 262144;
  #endif

  		/* set "size" field for PCOM */
  		iovp |= get_order(byte_cnt) + PAGE_SHIFT;

  		do {
  			/* clear I/O Pdir entry "valid" bit first */

  			((u8 *) pdir_ptr)[7] = 0;
  			if (ioc_needs_fdc) {
  				asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));
  #if 0
  				entries_per_cacheline = L1_CACHE_SHIFT - 3;
  #endif
  			}
  			pdir_ptr++;

  			byte_cnt -= IOVP_SIZE;

  		} while (byte_cnt > IOVP_SIZE);
  	} else
  		iovp |= IOVP_SHIFT;     /* set "size" field for PCOM */
  
  	/*
  	** clear I/O PDIR entry "valid" bit.
  	** We have to R/M/W the cacheline regardless how much of the
  	** pdir entry that we clobber.
  	** The rest of the entry would be useful for debugging if we
  	** could dump core on HPMC.
  	*/
  	((u8 *) pdir_ptr)[7] = 0;
  	if (ioc_needs_fdc)
  		asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));

  
  	WRITE_REG( SBA_IOVA(ioc, iovp, 0, 0), ioc->ioc_hpa+IOC_PCOM);
  }
  
  /**
   * sba_dma_supported - PCI driver can query DMA support
   * @dev: instance of PCI owned by the driver that's asking
   * @mask:  number of address bits this PCI device can handle
   *

   * See Documentation/DMA-API-HOWTO.txt

   */
  static int sba_dma_supported( struct device *dev, u64 mask)
  {
  	struct ioc *ioc;

  	if (dev == NULL) {
  		printk(KERN_ERR MODULE_NAME ": EISA/ISA/et al not supported
  ");
  		BUG();
  		return(0);
  	}

  	/* Documentation/DMA-API-HOWTO.txt tells drivers to try 64-bit

  	 * first, then fall back to 32-bit if that fails.

  	 * We are just "encouraging" 32-bit DMA masks here since we can
  	 * never allow IOMMU bypass unless we add special support for ZX1.
  	 */
  	if (mask > ~0U)
  		return 0;

  	ioc = GET_IOC(dev);

  	/*
  	 * check if mask is >= than the current max IO Virt Address
  	 * The max IO Virt address will *always* < 30 bits.
  	 */
  	return((int)(mask >= (ioc->ibase - 1 +
  			(ioc->pdir_size / sizeof(u64) * IOVP_SIZE) )));

  }
  
  
  /**
   * sba_map_single - map one buffer and return IOVA for DMA
   * @dev: instance of PCI owned by the driver that's asking.
   * @addr:  driver buffer to map.
   * @size:  number of bytes to map in driver buffer.
   * @direction:  R/W or both.
   *

   * See Documentation/DMA-API-HOWTO.txt

   */
  static dma_addr_t
  sba_map_single(struct device *dev, void *addr, size_t size,
  	       enum dma_data_direction direction)
  {
  	struct ioc *ioc;
  	unsigned long flags; 
  	dma_addr_t iovp;
  	dma_addr_t offset;
  	u64 *pdir_start;
  	int pide;
  
  	ioc = GET_IOC(dev);
  
  	/* save offset bits */
  	offset = ((dma_addr_t) (long) addr) & ~IOVP_MASK;
  
  	/* round up to nearest IOVP_SIZE */
  	size = (size + offset + ~IOVP_MASK) & IOVP_MASK;
  
  	spin_lock_irqsave(&ioc->res_lock, flags);
  #ifdef ASSERT_PDIR_SANITY
  	sba_check_pdir(ioc,"Check before sba_map_single()");
  #endif
  
  #ifdef SBA_COLLECT_STATS
  	ioc->msingle_calls++;
  	ioc->msingle_pages += size >> IOVP_SHIFT;
  #endif

  	pide = sba_alloc_range(ioc, dev, size);

  	iovp = (dma_addr_t) pide << IOVP_SHIFT;
  
  	DBG_RUN("%s() 0x%p -> 0x%lx
  ",

  		__func__, addr, (long) iovp | offset);

  
  	pdir_start = &(ioc->pdir_base[pide]);
  
  	while (size > 0) {
  		sba_io_pdir_entry(pdir_start, KERNEL_SPACE, (unsigned long) addr, 0);
  
  		DBG_RUN("	pdir 0x%p %02x%02x%02x%02x%02x%02x%02x%02x
  ",
  			pdir_start,
  			(u8) (((u8 *) pdir_start)[7]),
  			(u8) (((u8 *) pdir_start)[6]),
  			(u8) (((u8 *) pdir_start)[5]),
  			(u8) (((u8 *) pdir_start)[4]),
  			(u8) (((u8 *) pdir_start)[3]),
  			(u8) (((u8 *) pdir_start)[2]),
  			(u8) (((u8 *) pdir_start)[1]),
  			(u8) (((u8 *) pdir_start)[0])
  			);
  
  		addr += IOVP_SIZE;
  		size -= IOVP_SIZE;
  		pdir_start++;
  	}

  
  	/* force FDC ops in io_pdir_entry() to be visible to IOMMU */
  	if (ioc_needs_fdc)
  		asm volatile("sync" : : );

  #ifdef ASSERT_PDIR_SANITY
  	sba_check_pdir(ioc,"Check after sba_map_single()");
  #endif
  	spin_unlock_irqrestore(&ioc->res_lock, flags);

  
  	/* form complete address */

  	return SBA_IOVA(ioc, iovp, offset, DEFAULT_DMA_HINT_REG);
  }
  
  
  /**
   * sba_unmap_single - unmap one IOVA and free resources
   * @dev: instance of PCI owned by the driver that's asking.
   * @iova:  IOVA of driver buffer previously mapped.
   * @size:  number of bytes mapped in driver buffer.
   * @direction:  R/W or both.
   *

   * See Documentation/DMA-API-HOWTO.txt

   */
  static void
  sba_unmap_single(struct device *dev, dma_addr_t iova, size_t size,
  		 enum dma_data_direction direction)
  {
  	struct ioc *ioc;
  #if DELAYED_RESOURCE_CNT > 0
  	struct sba_dma_pair *d;
  #endif
  	unsigned long flags; 
  	dma_addr_t offset;

  	DBG_RUN("%s() iovp 0x%lx/%x
  ", __func__, (long) iova, size);

  
  	ioc = GET_IOC(dev);
  	offset = iova & ~IOVP_MASK;
  	iova ^= offset;        /* clear offset bits */
  	size += offset;

  	size = ALIGN(size, IOVP_SIZE);

  
  	spin_lock_irqsave(&ioc->res_lock, flags);
  
  #ifdef SBA_COLLECT_STATS
  	ioc->usingle_calls++;
  	ioc->usingle_pages += size >> IOVP_SHIFT;
  #endif
  
  	sba_mark_invalid(ioc, iova, size);
  
  #if DELAYED_RESOURCE_CNT > 0
  	/* Delaying when we re-use a IO Pdir entry reduces the number
  	 * of MMIO reads needed to flush writes to the PCOM register.
  	 */
  	d = &(ioc->saved[ioc->saved_cnt]);
  	d->iova = iova;
  	d->size = size;
  	if (++(ioc->saved_cnt) >= DELAYED_RESOURCE_CNT) {
  		int cnt = ioc->saved_cnt;
  		while (cnt--) {
  			sba_free_range(ioc, d->iova, d->size);
  			d--;
  		}
  		ioc->saved_cnt = 0;

  		READ_REG(ioc->ioc_hpa+IOC_PCOM);	/* flush purges */
  	}
  #else /* DELAYED_RESOURCE_CNT == 0 */
  	sba_free_range(ioc, iova, size);

  
  	/* If fdc's were issued, force fdc's to be visible now */
  	if (ioc_needs_fdc)
  		asm volatile("sync" : : );

  	READ_REG(ioc->ioc_hpa+IOC_PCOM);	/* flush purges */
  #endif /* DELAYED_RESOURCE_CNT == 0 */

  	spin_unlock_irqrestore(&ioc->res_lock, flags);
  
  	/* XXX REVISIT for 2.5 Linux - need syncdma for zero-copy support.
  	** For Astro based systems this isn't a big deal WRT performance.
  	** As long as 2.4 kernels copyin/copyout data from/to userspace,
  	** we don't need the syncdma. The issue here is I/O MMU cachelines
  	** are *not* coherent in all cases.  May be hwrev dependent.
  	** Need to investigate more.
  	asm volatile("syncdma");	
  	*/
  }
  
  
  /**
   * sba_alloc_consistent - allocate/map shared mem for DMA
   * @hwdev: instance of PCI owned by the driver that's asking.
   * @size:  number of bytes mapped in driver buffer.
   * @dma_handle:  IOVA of new buffer.
   *

   * See Documentation/DMA-API-HOWTO.txt

   */
  static void *sba_alloc_consistent(struct device *hwdev, size_t size,

  					dma_addr_t *dma_handle, gfp_t gfp)

  {
  	void *ret;
  
  	if (!hwdev) {
  		/* only support PCI */
  		*dma_handle = 0;

  		return NULL;

  	}
  
          ret = (void *) __get_free_pages(gfp, get_order(size));
  
  	if (ret) {
  		memset(ret, 0, size);
  		*dma_handle = sba_map_single(hwdev, ret, size, 0);
  	}
  
  	return ret;
  }
  
  
  /**
   * sba_free_consistent - free/unmap shared mem for DMA
   * @hwdev: instance of PCI owned by the driver that's asking.
   * @size:  number of bytes mapped in driver buffer.
   * @vaddr:  virtual address IOVA of "consistent" buffer.
   * @dma_handler:  IO virtual address of "consistent" buffer.
   *

   * See Documentation/DMA-API-HOWTO.txt

   */
  static void
  sba_free_consistent(struct device *hwdev, size_t size, void *vaddr,
  		    dma_addr_t dma_handle)
  {
  	sba_unmap_single(hwdev, dma_handle, size, 0);
  	free_pages((unsigned long) vaddr, get_order(size));
  }
  
  
  /*
  ** Since 0 is a valid pdir_base index value, can't use that
  ** to determine if a value is valid or not. Use a flag to indicate
  ** the SG list entry contains a valid pdir index.
  */
  #define PIDE_FLAG 0x80000000UL
  
  #ifdef SBA_COLLECT_STATS
  #define IOMMU_MAP_STATS
  #endif
  #include "iommu-helpers.h"
  
  #ifdef DEBUG_LARGE_SG_ENTRIES
  int dump_run_sg = 0;
  #endif
  
  
  /**
   * sba_map_sg - map Scatter/Gather list
   * @dev: instance of PCI owned by the driver that's asking.
   * @sglist:  array of buffer/length pairs
   * @nents:  number of entries in list
   * @direction:  R/W or both.
   *

   * See Documentation/DMA-API-HOWTO.txt

   */
  static int
  sba_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
  	   enum dma_data_direction direction)
  {
  	struct ioc *ioc;
  	int coalesced, filled = 0;
  	unsigned long flags;

  	DBG_RUN_SG("%s() START %d entries
  ", __func__, nents);

  
  	ioc = GET_IOC(dev);
  
  	/* Fast path single entry scatterlists. */
  	if (nents == 1) {
  		sg_dma_address(sglist) = sba_map_single(dev,
  						(void *)sg_virt_addr(sglist),
  						sglist->length, direction);
  		sg_dma_len(sglist)     = sglist->length;
  		return 1;
  	}
  
  	spin_lock_irqsave(&ioc->res_lock, flags);
  
  #ifdef ASSERT_PDIR_SANITY
  	if (sba_check_pdir(ioc,"Check before sba_map_sg()"))
  	{
  		sba_dump_sg(ioc, sglist, nents);
  		panic("Check before sba_map_sg()");
  	}
  #endif
  
  #ifdef SBA_COLLECT_STATS
  	ioc->msg_calls++;
  #endif
  
  	/*
  	** First coalesce the chunks and allocate I/O pdir space
  	**
  	** If this is one DMA stream, we can properly map using the
  	** correct virtual address associated with each DMA page.
  	** w/o this association, we wouldn't have coherent DMA!
  	** Access to the virtual address is what forces a two pass algorithm.
  	*/

  	coalesced = iommu_coalesce_chunks(ioc, dev, sglist, nents, sba_alloc_range);

  
  	/*
  	** Program the I/O Pdir
  	**
  	** map the virtual addresses to the I/O Pdir
  	** o dma_address will contain the pdir index
  	** o dma_len will contain the number of bytes to map 
  	** o address contains the virtual address.
  	*/
  	filled = iommu_fill_pdir(ioc, sglist, nents, 0, sba_io_pdir_entry);

  	/* force FDC ops in io_pdir_entry() to be visible to IOMMU */
  	if (ioc_needs_fdc)
  		asm volatile("sync" : : );

  #ifdef ASSERT_PDIR_SANITY
  	if (sba_check_pdir(ioc,"Check after sba_map_sg()"))
  	{
  		sba_dump_sg(ioc, sglist, nents);
  		panic("Check after sba_map_sg()
  ");
  	}
  #endif
  
  	spin_unlock_irqrestore(&ioc->res_lock, flags);

  	DBG_RUN_SG("%s() DONE %d mappings
  ", __func__, filled);

  
  	return filled;
  }
  
  
  /**
   * sba_unmap_sg - unmap Scatter/Gather list
   * @dev: instance of PCI owned by the driver that's asking.
   * @sglist:  array of buffer/length pairs
   * @nents:  number of entries in list
   * @direction:  R/W or both.
   *

   * See Documentation/DMA-API-HOWTO.txt

   */
  static void 
  sba_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents,
  	     enum dma_data_direction direction)
  {
  	struct ioc *ioc;
  #ifdef ASSERT_PDIR_SANITY
  	unsigned long flags;
  #endif
  
  	DBG_RUN_SG("%s() START %d entries,  %p,%x
  ",

  		__func__, nents, sg_virt_addr(sglist), sglist->length);

  
  	ioc = GET_IOC(dev);
  
  #ifdef SBA_COLLECT_STATS
  	ioc->usg_calls++;
  #endif
  
  #ifdef ASSERT_PDIR_SANITY
  	spin_lock_irqsave(&ioc->res_lock, flags);
  	sba_check_pdir(ioc,"Check before sba_unmap_sg()");
  	spin_unlock_irqrestore(&ioc->res_lock, flags);
  #endif
  
  	while (sg_dma_len(sglist) && nents--) {
  
  		sba_unmap_single(dev, sg_dma_address(sglist), sg_dma_len(sglist), direction);
  #ifdef SBA_COLLECT_STATS
  		ioc->usg_pages += ((sg_dma_address(sglist) & ~IOVP_MASK) + sg_dma_len(sglist) + IOVP_SIZE - 1) >> PAGE_SHIFT;
  		ioc->usingle_calls--;	/* kluge since call is unmap_sg() */
  #endif
  		++sglist;
  	}

  	DBG_RUN_SG("%s() DONE (nents %d)
  ", __func__,  nents);

  
  #ifdef ASSERT_PDIR_SANITY
  	spin_lock_irqsave(&ioc->res_lock, flags);
  	sba_check_pdir(ioc,"Check after sba_unmap_sg()");
  	spin_unlock_irqrestore(&ioc->res_lock, flags);
  #endif
  
  }
  
  static struct hppa_dma_ops sba_ops = {
  	.dma_supported =	sba_dma_supported,
  	.alloc_consistent =	sba_alloc_consistent,
  	.alloc_noncoherent =	sba_alloc_consistent,
  	.free_consistent =	sba_free_consistent,
  	.map_single =		sba_map_single,
  	.unmap_single =		sba_unmap_single,
  	.map_sg =		sba_map_sg,
  	.unmap_sg =		sba_unmap_sg,
  	.dma_sync_single_for_cpu =	NULL,
  	.dma_sync_single_for_device =	NULL,
  	.dma_sync_sg_for_cpu =		NULL,
  	.dma_sync_sg_for_device =	NULL,
  };
  
  
  /**************************************************************************
  **
  **   SBA PAT PDC support
  **
  **   o call pdc_pat_cell_module()
  **   o store ranges in PCI "resource" structures
  **
  **************************************************************************/
  
  static void
  sba_get_pat_resources(struct sba_device *sba_dev)
  {
  #if 0
  /*
  ** TODO/REVISIT/FIXME: support for directed ranges requires calls to
  **      PAT PDC to program the SBA/LBA directed range registers...this
  **      burden may fall on the LBA code since it directly supports the
  **      PCI subsystem. It's not clear yet. - ggg
  */
  PAT_MOD(mod)->mod_info.mod_pages   = PAT_GET_MOD_PAGES(temp);
  	FIXME : ???
  PAT_MOD(mod)->mod_info.dvi         = PAT_GET_DVI(temp);
  	Tells where the dvi bits are located in the address.
  PAT_MOD(mod)->mod_info.ioc         = PAT_GET_IOC(temp);
  	FIXME : ???
  #endif
  }
  
  
  /**************************************************************
  *
  *   Initialization and claim
  *
  ***************************************************************/
  #define PIRANHA_ADDR_MASK	0x00160000UL /* bit 17,18,20 */
  #define PIRANHA_ADDR_VAL	0x00060000UL /* bit 17,18 on */
  static void *
  sba_alloc_pdir(unsigned int pdir_size)
  {
          unsigned long pdir_base;
  	unsigned long pdir_order = get_order(pdir_size);
  
  	pdir_base = __get_free_pages(GFP_KERNEL, pdir_order);

  	if (NULL == (void *) pdir_base)	{
  		panic("%s() could not allocate I/O Page Table
  ",

  			__func__);

  	}

  
  	/* If this is not PA8700 (PCX-W2)
  	**	OR newer than ver 2.2
  	**	OR in a system that doesn't need VINDEX bits from SBA,
  	**
  	** then we aren't exposed to the HW bug.
  	*/
  	if ( ((boot_cpu_data.pdc.cpuid >> 5) & 0x7f) != 0x13
  			|| (boot_cpu_data.pdc.versions > 0x202)
  			|| (boot_cpu_data.pdc.capabilities & 0x08L) )
  		return (void *) pdir_base;
  
  	/*
  	 * PA8700 (PCX-W2, aka piranha) silent data corruption fix
  	 *
  	 * An interaction between PA8700 CPU (Ver 2.2 or older) and
  	 * Ike/Astro can cause silent data corruption. This is only
  	 * a problem if the I/O PDIR is located in memory such that
  	 * (little-endian)  bits 17 and 18 are on and bit 20 is off.
  	 *
  	 * Since the max IO Pdir size is 2MB, by cleverly allocating the
  	 * right physical address, we can either avoid (IOPDIR <= 1MB)
  	 * or minimize (2MB IO Pdir) the problem if we restrict the
  	 * IO Pdir to a maximum size of 2MB-128K (1902K).
  	 *
  	 * Because we always allocate 2^N sized IO pdirs, either of the
  	 * "bad" regions will be the last 128K if at all. That's easy
  	 * to test for.
  	 * 
  	 */
  	if (pdir_order <= (19-12)) {
  		if (((virt_to_phys(pdir_base)+pdir_size-1) & PIRANHA_ADDR_MASK) == PIRANHA_ADDR_VAL) {
  			/* allocate a new one on 512k alignment */
  			unsigned long new_pdir = __get_free_pages(GFP_KERNEL, (19-12));
  			/* release original */
  			free_pages(pdir_base, pdir_order);
  
  			pdir_base = new_pdir;
  
  			/* release excess */
  			while (pdir_order < (19-12)) {
  				new_pdir += pdir_size;
  				free_pages(new_pdir, pdir_order);
  				pdir_order +=1;
  				pdir_size <<=1;
  			}
  		}
  	} else {
  		/*
  		** 1MB or 2MB Pdir
  		** Needs to be aligned on an "odd" 1MB boundary.
  		*/
  		unsigned long new_pdir = __get_free_pages(GFP_KERNEL, pdir_order+1); /* 2 or 4MB */
  
  		/* release original */
  		free_pages( pdir_base, pdir_order);
  
  		/* release first 1MB */
  		free_pages(new_pdir, 20-12);
  
  		pdir_base = new_pdir + 1024*1024;
  
  		if (pdir_order > (20-12)) {
  			/*
  			** 2MB Pdir.
  			**
  			** Flag tells init_bitmap() to mark bad 128k as used
  			** and to reduce the size by 128k.
  			*/
  			piranha_bad_128k = 1;
  
  			new_pdir += 3*1024*1024;
  			/* release last 1MB */
  			free_pages(new_pdir, 20-12);
  
  			/* release unusable 128KB */
  			free_pages(new_pdir - 128*1024 , 17-12);
  
  			pdir_size -= 128*1024;
  		}
  	}
  
  	memset((void *) pdir_base, 0, pdir_size);
  	return (void *) pdir_base;
  }

  struct ibase_data_struct {
  	struct ioc *ioc;
  	int ioc_num;
  };
  
  static int setup_ibase_imask_callback(struct device *dev, void *data)

  {

  	/* lba_set_iregs() is in drivers/parisc/lba_pci.c */
          extern void lba_set_iregs(struct parisc_device *, u32, u32);
  	struct parisc_device *lba = to_parisc_device(dev);
  	struct ibase_data_struct *ibd = data;
  	int rope_num = (lba->hpa.start >> 13) & 0xf;
  	if (rope_num >> 3 == ibd->ioc_num)
  		lba_set_iregs(lba, ibd->ioc->ibase, ibd->ioc->imask);
  	return 0;

  }

  /* setup Mercury or Elroy IBASE/IMASK registers. */

  static void 
  setup_ibase_imask(struct parisc_device *sba, struct ioc *ioc, int ioc_num)

  {

  	struct ibase_data_struct ibase_data = {
  		.ioc		= ioc,
  		.ioc_num	= ioc_num,
  	};
  
  	device_for_each_child(&sba->dev, &ibase_data,
  			      setup_ibase_imask_callback);

  }

  #ifdef SBA_AGP_SUPPORT
  static int
  sba_ioc_find_quicksilver(struct device *dev, void *data)
  {
  	int *agp_found = data;
  	struct parisc_device *lba = to_parisc_device(dev);
  
  	if (IS_QUICKSILVER(lba))
  		*agp_found = 1;
  	return 0;
  }
  #endif

  static void
  sba_ioc_init_pluto(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
  {
  	u32 iova_space_mask;
  	u32 iova_space_size;
  	int iov_order, tcnfg;

  #ifdef SBA_AGP_SUPPORT

  	int agp_found = 0;
  #endif
  	/*
  	** Firmware programs the base and size of a "safe IOVA space"
  	** (one that doesn't overlap memory or LMMIO space) in the
  	** IBASE and IMASK registers.
  	*/
  	ioc->ibase = READ_REG(ioc->ioc_hpa + IOC_IBASE);
  	iova_space_size = ~(READ_REG(ioc->ioc_hpa + IOC_IMASK) & 0xFFFFFFFFUL) + 1;
  
  	if ((ioc->ibase < 0xfed00000UL) && ((ioc->ibase + iova_space_size) > 0xfee00000UL)) {
  		printk("WARNING: IOV space overlaps local config and interrupt message, truncating
  ");
  		iova_space_size /= 2;
  	}
  
  	/*
  	** iov_order is always based on a 1GB IOVA space since we want to
  	** turn on the other half for AGP GART.
  	*/
  	iov_order = get_order(iova_space_size >> (IOVP_SHIFT - PAGE_SHIFT));
  	ioc->pdir_size = (iova_space_size / IOVP_SIZE) * sizeof(u64);

  	DBG_INIT("%s() hpa 0x%p IOV %dMB (%d bits)
  ",

  		__func__, ioc->ioc_hpa, iova_space_size >> 20,

  		iov_order + PAGE_SHIFT);
  
  	ioc->pdir_base = (void *) __get_free_pages(GFP_KERNEL,
  						   get_order(ioc->pdir_size));
  	if (!ioc->pdir_base)
  		panic("Couldn't allocate I/O Page Table
  ");
  
  	memset(ioc->pdir_base, 0, ioc->pdir_size);
  
  	DBG_INIT("%s() pdir %p size %x
  ",

  			__func__, ioc->pdir_base, ioc->pdir_size);

  #ifdef SBA_HINT_SUPPORT

  	ioc->hint_shift_pdir = iov_order + PAGE_SHIFT;
  	ioc->hint_mask_pdir = ~(0x3 << (iov_order + PAGE_SHIFT));
  
  	DBG_INIT("	hint_shift_pdir %x hint_mask_pdir %lx
  ",
  		ioc->hint_shift_pdir, ioc->hint_mask_pdir);
  #endif
  
  	WARN_ON((((unsigned long) ioc->pdir_base) & PAGE_MASK) != (unsigned long) ioc->pdir_base);
  	WRITE_REG(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE);
  
  	/* build IMASK for IOC and Elroy */
  	iova_space_mask =  0xffffffff;
  	iova_space_mask <<= (iov_order + PAGE_SHIFT);
  	ioc->imask = iova_space_mask;
  #ifdef ZX1_SUPPORT
  	ioc->iovp_mask = ~(iova_space_mask + PAGE_SIZE - 1);
  #endif
  	sba_dump_tlb(ioc->ioc_hpa);
  
  	setup_ibase_imask(sba, ioc, ioc_num);
  
  	WRITE_REG(ioc->imask, ioc->ioc_hpa + IOC_IMASK);

  #ifdef CONFIG_64BIT

  	/*
  	** Setting the upper bits makes checking for bypass addresses
  	** a little faster later on.
  	*/
  	ioc->imask |= 0xFFFFFFFF00000000UL;
  #endif
  
  	/* Set I/O PDIR Page size to system page size */
  	switch (PAGE_SHIFT) {
  		case 12: tcnfg = 0; break;	/*  4K */
  		case 13: tcnfg = 1; break;	/*  8K */
  		case 14: tcnfg = 2; break;	/* 16K */
  		case 16: tcnfg = 3; break;	/* 64K */
  		default:
  			panic(__FILE__ "Unsupported system page size %d",
  				1 << PAGE_SHIFT);
  			break;
  	}
  	WRITE_REG(tcnfg, ioc->ioc_hpa + IOC_TCNFG);
  
  	/*
  	** Program the IOC's ibase and enable IOVA translation
  	** Bit zero == enable bit.
  	*/
  	WRITE_REG(ioc->ibase | 1, ioc->ioc_hpa + IOC_IBASE);
  
  	/*
  	** Clear I/O TLB of any possible entries.
  	** (Yes. This is a bit paranoid...but so what)
  	*/
  	WRITE_REG(ioc->ibase | 31, ioc->ioc_hpa + IOC_PCOM);

  #ifdef SBA_AGP_SUPPORT

  	/*
  	** If an AGP device is present, only use half of the IOV space
  	** for PCI DMA.  Unfortunately we can't know ahead of time
  	** whether GART support will actually be used, for now we
  	** can just key on any AGP device found in the system.
  	** We program the next pdir index after we stop w/ a key for
  	** the GART code to handshake on.
  	*/

  	device_for_each_child(&sba->dev, &agp_found, sba_ioc_find_quicksilver);

  	if (agp_found && sba_reserve_agpgart) {
  		printk(KERN_INFO "%s: reserving %dMb of IOVA space for agpgart
  ",

  		       __func__, (iova_space_size/2) >> 20);

  		ioc->pdir_size /= 2;

  		ioc->pdir_base[PDIR_INDEX(iova_space_size/2)] = SBA_AGPGART_COOKIE;

  	}

  #endif /*SBA_AGP_SUPPORT*/

  }
  
  static void
  sba_ioc_init(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
  {
  	u32 iova_space_size, iova_space_mask;
  	unsigned int pdir_size, iov_order;
  
  	/*
  	** Determine IOVA Space size from memory size.
  	**
  	** Ideally, PCI drivers would register the maximum number
  	** of DMA they can have outstanding for each device they
  	** own.  Next best thing would be to guess how much DMA
  	** can be outstanding based on PCI Class/sub-class. Both
  	** methods still require some "extra" to support PCI
  	** Hot-Plug/Removal of PCI cards. (aka PCI OLARD).
  	**
  	** While we have 32-bits "IOVA" space, top two 2 bits are used
  	** for DMA hints - ergo only 30 bits max.
  	*/

  	iova_space_size = (u32) (totalram_pages/global_ioc_cnt);

  
  	/* limit IOVA space size to 1MB-1GB */
  	if (iova_space_size < (1 << (20 - PAGE_SHIFT))) {
  		iova_space_size = 1 << (20 - PAGE_SHIFT);
  	}

  	else if (iova_space_size > (1 << (30 - PAGE_SHIFT))) {
  		iova_space_size = 1 << (30 - PAGE_SHIFT);
  	}

  
  	/*
  	** iova space must be log2() in size.
  	** thus, pdir/res_map will also be log2().
  	** PIRANHA BUG: Exception is when IO Pdir is 2MB (gets reduced)
  	*/
  	iov_order = get_order(iova_space_size << PAGE_SHIFT);
  
  	/* iova_space_size is now bytes, not pages */
  	iova_space_size = 1 << (iov_order + PAGE_SHIFT);
  
  	ioc->pdir_size = pdir_size = (iova_space_size/IOVP_SIZE) * sizeof(u64);
  
  	DBG_INIT("%s() hpa 0x%lx mem %ldMB IOV %dMB (%d bits)
  ",

  			__func__,

  			ioc->ioc_hpa,

  			(unsigned long) totalram_pages >> (20 - PAGE_SHIFT),

  			iova_space_size>>20,
  			iov_order + PAGE_SHIFT);
  
  	ioc->pdir_base = sba_alloc_pdir(pdir_size);
  
  	DBG_INIT("%s() pdir %p size %x
  ",

  			__func__, ioc->pdir_base, pdir_size);

  #ifdef SBA_HINT_SUPPORT

  	/* FIXME : DMA HINTs not used */
  	ioc->hint_shift_pdir = iov_order + PAGE_SHIFT;
  	ioc->hint_mask_pdir = ~(0x3 << (iov_order + PAGE_SHIFT));
  
  	DBG_INIT("	hint_shift_pdir %x hint_mask_pdir %lx
  ",
  			ioc->hint_shift_pdir, ioc->hint_mask_pdir);
  #endif
  
  	WRITE_REG64(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE);
  
  	/* build IMASK for IOC and Elroy */
  	iova_space_mask =  0xffffffff;
  	iova_space_mask <<= (iov_order + PAGE_SHIFT);
  
  	/*
  	** On C3000 w/512MB mem, HP-UX 10.20 reports:
  	**     ibase=0, imask=0xFE000000, size=0x2000000.
  	*/
  	ioc->ibase = 0;
  	ioc->imask = iova_space_mask;	/* save it */
  #ifdef ZX1_SUPPORT
  	ioc->iovp_mask = ~(iova_space_mask + PAGE_SIZE - 1);
  #endif
  
  	DBG_INIT("%s() IOV base 0x%lx mask 0x%0lx
  ",

  		__func__, ioc->ibase, ioc->imask);

  
  	/*
  	** FIXME: Hint registers are programmed with default hint
  	** values during boot, so hints should be sane even if we
  	** can't reprogram them the way drivers want.
  	*/
  
  	setup_ibase_imask(sba, ioc, ioc_num);
  
  	/*
  	** Program the IOC's ibase and enable IOVA translation
  	*/
  	WRITE_REG(ioc->ibase | 1, ioc->ioc_hpa+IOC_IBASE);
  	WRITE_REG(ioc->imask, ioc->ioc_hpa+IOC_IMASK);
  
  	/* Set I/O PDIR Page size to 4K */
  	WRITE_REG(0, ioc->ioc_hpa+IOC_TCNFG);
  
  	/*
  	** Clear I/O TLB of any possible entries.
  	** (Yes. This is a bit paranoid...but so what)
  	*/
  	WRITE_REG(0 | 31, ioc->ioc_hpa+IOC_PCOM);
  
  	ioc->ibase = 0; /* used by SBA_IOVA and related macros */	

  	DBG_INIT("%s() DONE
  ", __func__);

  }
  
  
  
  /**************************************************************************
  **
  **   SBA initialization code (HW and SW)
  **
  **   o identify SBA chip itself
  **   o initialize SBA chip modes (HardFail)
  **   o initialize SBA chip modes (HardFail)
  **   o FIXME: initialize DMA hints for reasonable defaults
  **
  **************************************************************************/

  static void __iomem *ioc_remap(struct sba_device *sba_dev, unsigned int offset)

  {

  	return ioremap_nocache(sba_dev->dev->hpa.start + offset, SBA_FUNC_SIZE);

  }
  
  static void sba_hw_init(struct sba_device *sba_dev)
  { 
  	int i;
  	int num_ioc;
  	u64 ioc_ctl;
  
  	if (!is_pdc_pat()) {
  		/* Shutdown the USB controller on Astro-based workstations.
  		** Once we reprogram the IOMMU, the next DMA performed by
  		** USB will HPMC the box. USB is only enabled if a
  		** keyboard is present and found.
  		**
  		** With serial console, j6k v5.0 firmware says:
  		**   mem_kbd hpa 0xfee003f8 sba 0x0 pad 0x0 cl_class 0x7
  		**
  		** FIXME: Using GFX+USB console at power up but direct
  		**	linux to serial console is still broken.
  		**	USB could generate DMA so we must reset USB.
  		**	The proper sequence would be:
  		**	o block console output
  		**	o reset USB device
  		**	o reprogram serial port
  		**	o unblock console output
  		*/
  		if (PAGE0->mem_kbd.cl_class == CL_KEYBD) {
  			pdc_io_reset_devices();
  		}
  
  	}
  
  
  #if 0
  printk("sba_hw_init(): mem_boot 0x%x 0x%x 0x%x 0x%x
  ", PAGE0->mem_boot.hpa,
  	PAGE0->mem_boot.spa, PAGE0->mem_boot.pad, PAGE0->mem_boot.cl_class);
  
  	/*
  	** Need to deal with DMA from LAN.
  	**	Maybe use page zero boot device as a handle to talk
  	**	to PDC about which device to shutdown.
  	**
  	** Netbooting, j6k v5.0 firmware says:
  	** 	mem_boot hpa 0xf4008000 sba 0x0 pad 0x0 cl_class 0x1002
  	** ARGH! invalid class.
  	*/
  	if ((PAGE0->mem_boot.cl_class != CL_RANDOM)
  		&& (PAGE0->mem_boot.cl_class != CL_SEQU)) {
  			pdc_io_reset();
  	}
  #endif

  	if (!IS_PLUTO(sba_dev->dev)) {

  		ioc_ctl = READ_REG(sba_dev->sba_hpa+IOC_CTRL);
  		DBG_INIT("%s() hpa 0x%lx ioc_ctl 0x%Lx ->",

  			__func__, sba_dev->sba_hpa, ioc_ctl);

  		ioc_ctl &= ~(IOC_CTRL_RM | IOC_CTRL_NC | IOC_CTRL_CE);
  		ioc_ctl |= IOC_CTRL_DD | IOC_CTRL_D4 | IOC_CTRL_TC;
  			/* j6700 v1.6 firmware sets 0x294f */
  			/* A500 firmware sets 0x4d */
  
  		WRITE_REG(ioc_ctl, sba_dev->sba_hpa+IOC_CTRL);
  
  #ifdef DEBUG_SBA_INIT
  		ioc_ctl = READ_REG64(sba_dev->sba_hpa+IOC_CTRL);
  		DBG_INIT(" 0x%Lx
  ", ioc_ctl);
  #endif
  	} /* if !PLUTO */

  	if (IS_ASTRO(sba_dev->dev)) {

  		int err;

  		sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, ASTRO_IOC_OFFSET);
  		num_ioc = 1;
  
  		sba_dev->chip_resv.name = "Astro Intr Ack";
  		sba_dev->chip_resv.start = PCI_F_EXTEND | 0xfef00000UL;
  		sba_dev->chip_resv.end   = PCI_F_EXTEND | (0xff000000UL - 1) ;
  		err = request_resource(&iomem_resource, &(sba_dev->chip_resv));

  		BUG_ON(err < 0);

  	} else if (IS_PLUTO(sba_dev->dev)) {

  		int err;

  		sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, PLUTO_IOC_OFFSET);
  		num_ioc = 1;
  
  		sba_dev->chip_resv.name = "Pluto Intr/PIOP/VGA";
  		sba_dev->chip_resv.start = PCI_F_EXTEND | 0xfee00000UL;
  		sba_dev->chip_resv.end   = PCI_F_EXTEND | (0xff200000UL - 1);
  		err = request_resource(&iomem_resource, &(sba_dev->chip_resv));
  		WARN_ON(err < 0);
  
  		sba_dev->iommu_resv.name = "IOVA Space";
  		sba_dev->iommu_resv.start = 0x40000000UL;
  		sba_dev->iommu_resv.end   = 0x50000000UL - 1;
  		err = request_resource(&iomem_resource, &(sba_dev->iommu_resv));
  		WARN_ON(err < 0);
  	} else {

  		/* IKE, REO */

  		sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, IKE_IOC_OFFSET(0));
  		sba_dev->ioc[1].ioc_hpa = ioc_remap(sba_dev, IKE_IOC_OFFSET(1));
  		num_ioc = 2;
  
  		/* TODO - LOOKUP Ike/Stretch chipset mem map */
  	}

  	/* XXX: What about Reo Grande? */

  
  	sba_dev->num_ioc = num_ioc;
  	for (i = 0; i < num_ioc; i++) {

  		void __iomem *ioc_hpa = sba_dev->ioc[i].ioc_hpa;

  		unsigned int j;
  
  		for (j=0; j < sizeof(u64) * ROPES_PER_IOC; j+=sizeof(u64)) {
  
  			/*
  			 * Clear ROPE(N)_CONFIG AO bit.
  			 * Disables "NT Ordering" (~= !"Relaxed Ordering")
  			 * Overrides bit 1 in DMA Hint Sets.
  			 * Improves netperf UDP_STREAM by ~10% for bcm5701.
  			 */

  			if (IS_PLUTO(sba_dev->dev)) {

  				void __iomem *rope_cfg;
  				unsigned long cfg_val;

  
  				rope_cfg = ioc_hpa + IOC_ROPE0_CFG + j;
  				cfg_val = READ_REG(rope_cfg);
  				cfg_val &= ~IOC_ROPE_AO;
  				WRITE_REG(cfg_val, rope_cfg);
  			}
  
  			/*
  			** Make sure the box crashes on rope errors.
  			*/
  			WRITE_REG(HF_ENABLE, ioc_hpa + ROPE0_CTL + j);
  		}
  
  		/* flush out the last writes */

  		READ_REG(sba_dev->ioc[i].ioc_hpa + ROPE7_CTL);
  
  		DBG_INIT("	ioc[%d] ROPE_CFG 0x%Lx  ROPE_DBG 0x%Lx
  ",
  				i,
  				READ_REG(sba_dev->ioc[i].ioc_hpa + 0x40),
  				READ_REG(sba_dev->ioc[i].ioc_hpa + 0x50)
  			);
  		DBG_INIT("	STATUS_CONTROL 0x%Lx  FLUSH_CTRL 0x%Lx
  ",
  				READ_REG(sba_dev->ioc[i].ioc_hpa + 0x108),
  				READ_REG(sba_dev->ioc[i].ioc_hpa + 0x400)
  			);

  		if (IS_PLUTO(sba_dev->dev)) {

  			sba_ioc_init_pluto(sba_dev->dev, &(sba_dev->ioc[i]), i);
  		} else {
  			sba_ioc_init(sba_dev->dev, &(sba_dev->ioc[i]), i);
  		}
  	}
  }
  
  static void
  sba_common_init(struct sba_device *sba_dev)
  {
  	int i;
  
  	/* add this one to the head of the list (order doesn't matter)
  	** This will be useful for debugging - especially if we get coredumps
  	*/
  	sba_dev->next = sba_list;
  	sba_list = sba_dev;
  
  	for(i=0; i< sba_dev->num_ioc; i++) {
  		int res_size;
  #ifdef DEBUG_DMB_TRAP
  		extern void iterate_pages(unsigned long , unsigned long ,
  					  void (*)(pte_t * , unsigned long),
  					  unsigned long );
  		void set_data_memory_break(pte_t * , unsigned long);
  #endif
  		/* resource map size dictated by pdir_size */
  		res_size = sba_dev->ioc[i].pdir_size/sizeof(u64); /* entries */
  
  		/* Second part of PIRANHA BUG */
  		if (piranha_bad_128k) {
  			res_size -= (128*1024)/sizeof(u64);
  		}
  
  		res_size >>= 3;  /* convert bit count to byte count */
  		DBG_INIT("%s() res_size 0x%x
  ",

  			__func__, res_size);

  
  		sba_dev->ioc[i].res_size = res_size;
  		sba_dev->ioc[i].res_map = (char *) __get_free_pages(GFP_KERNEL, get_order(res_size));
  
  #ifdef DEBUG_DMB_TRAP
  		iterate_pages( sba_dev->ioc[i].res_map, res_size,
  				set_data_memory_break, 0);
  #endif
  
  		if (NULL == sba_dev->ioc[i].res_map)
  		{
  			panic("%s:%s() could not allocate resource map
  ",

  			      __FILE__, __func__ );

  		}
  
  		memset(sba_dev->ioc[i].res_map, 0, res_size);
  		/* next available IOVP - circular search */
  		sba_dev->ioc[i].res_hint = (unsigned long *)
  				&(sba_dev->ioc[i].res_map[L1_CACHE_BYTES]);
  
  #ifdef ASSERT_PDIR_SANITY
  		/* Mark first bit busy - ie no IOVA 0 */
  		sba_dev->ioc[i].res_map[0] = 0x80;
  		sba_dev->ioc[i].pdir_base[0] = 0xeeffc0addbba0080ULL;
  #endif
  
  		/* Third (and last) part of PIRANHA BUG */
  		if (piranha_bad_128k) {
  			/* region from +1408K to +1536 is un-usable. */
  
  			int idx_start = (1408*1024/sizeof(u64)) >> 3;
  			int idx_end   = (1536*1024/sizeof(u64)) >> 3;
  			long *p_start = (long *) &(sba_dev->ioc[i].res_map[idx_start]);
  			long *p_end   = (long *) &(sba_dev->ioc[i].res_map[idx_end]);
  
  			/* mark that part of the io pdir busy */
  			while (p_start < p_end)
  				*p_start++ = -1;
  				
  		}
  
  #ifdef DEBUG_DMB_TRAP
  		iterate_pages( sba_dev->ioc[i].res_map, res_size,
  				set_data_memory_break, 0);
  		iterate_pages( sba_dev->ioc[i].pdir_base, sba_dev->ioc[i].pdir_size,
  				set_data_memory_break, 0);
  #endif
  
  		DBG_INIT("%s() %d res_map %x %p
  ",

  			__func__, i, res_size, sba_dev->ioc[i].res_map);

  	}
  
  	spin_lock_init(&sba_dev->sba_lock);
  	ioc_needs_fdc = boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC;
  
  #ifdef DEBUG_SBA_INIT
  	/*
  	 * If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set
  	 * (bit #61, big endian), we have to flush and sync every time
  	 * IO-PDIR is changed in Ike/Astro.
  	 */

  	if (ioc_needs_fdc) {

  		printk(KERN_INFO MODULE_NAME " FDC/SYNC required.
  ");
  	} else {
  		printk(KERN_INFO MODULE_NAME " IOC has cache coherent PDIR.
  ");
  	}
  #endif
  }
  
  #ifdef CONFIG_PROC_FS

  static int sba_proc_info(struct seq_file *m, void *p)

  {
  	struct sba_device *sba_dev = sba_list;
  	struct ioc *ioc = &sba_dev->ioc[0];	/* FIXME: Multi-IOC support! */
  	int total_pages = (int) (ioc->res_size << 3); /* 8 bits per byte */

  #ifdef SBA_COLLECT_STATS
  	unsigned long avg = 0, min, max;
  #endif

  	int i, len = 0;

  	len += seq_printf(m, "%s rev %d.%d
  ",

  		sba_dev->name,
  		(sba_dev->hw_rev & 0x7) + 1,
  		(sba_dev->hw_rev & 0x18) >> 3
  		);

  	len += seq_printf(m, "IO PDIR size    : %d bytes (%d entries)
  ",

  		(int) ((ioc->res_size << 3) * sizeof(u64)), /* 8 bits/byte */
  		total_pages);

  	len += seq_printf(m, "Resource bitmap : %d bytes (%d pages)
  ", 
  		ioc->res_size, ioc->res_size << 3);   /* 8 bits per byte */

  	len += seq_printf(m, "LMMIO_BASE/MASK/ROUTE %08x %08x %08x
  ",

  		READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_BASE),
  		READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_MASK),
  		READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_ROUTE)
  		);
  
  	for (i=0; i<4; i++)

  		len += seq_printf(m, "DIR%d_BASE/MASK/ROUTE %08x %08x %08x
  ", i,

  			READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_BASE  + i*0x18),
  			READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_MASK  + i*0x18),
  			READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_ROUTE + i*0x18)
  		);
  
  #ifdef SBA_COLLECT_STATS

  	len += seq_printf(m, "IO PDIR entries : %ld free  %ld used (%d%%)
  ",

  		total_pages - ioc->used_pages, ioc->used_pages,
  		(int) (ioc->used_pages * 100 / total_pages));
  
  	min = max = ioc->avg_search[0];
  	for (i = 0; i < SBA_SEARCH_SAMPLE; i++) {
  		avg += ioc->avg_search[i];
  		if (ioc->avg_search[i] > max) max = ioc->avg_search[i];
  		if (ioc->avg_search[i] < min) min = ioc->avg_search[i];
  	}
  	avg /= SBA_SEARCH_SAMPLE;

  	len += seq_printf(m, "  Bitmap search : %ld/%ld/%ld (min/avg/max CPU Cycles)
  ",
  		min, avg, max);

  	len += seq_printf(m, "pci_map_single(): %12ld calls  %12ld pages (avg %d/1000)
  ",
  		ioc->msingle_calls, ioc->msingle_pages,

  		(int) ((ioc->msingle_pages * 1000)/ioc->msingle_calls));
  
  	/* KLUGE - unmap_sg calls unmap_single for each mapped page */
  	min = ioc->usingle_calls;
  	max = ioc->usingle_pages - ioc->usg_pages;

  	len += seq_printf(m, "pci_unmap_single: %12ld calls  %12ld pages (avg %d/1000)
  ",
  		min, max, (int) ((max * 1000)/min));

  	len += seq_printf(m, "pci_map_sg()    : %12ld calls  %12ld pages (avg %d/1000)
  ",
  		ioc->msg_calls, ioc->msg_pages, 

  		(int) ((ioc->msg_pages * 1000)/ioc->msg_calls));

  	len += seq_printf(m, "pci_unmap_sg()  : %12ld calls  %12ld pages (avg %d/1000)
  ",
  		ioc->usg_calls, ioc->usg_pages,

  		(int) ((ioc->usg_pages * 1000)/ioc->usg_calls));
  #endif

  	return 0;

  }

  static int

  sba_proc_open(struct inode *i, struct file *f)
  {
  	return single_open(f, &sba_proc_info, NULL);
  }

  static const struct file_operations sba_proc_fops = {

  	.owner = THIS_MODULE,
  	.open = sba_proc_open,
  	.read = seq_read,
  	.llseek = seq_lseek,
  	.release = single_release,
  };
  
  static int
  sba_proc_bitmap_info(struct seq_file *m, void *p)

  {
  	struct sba_device *sba_dev = sba_list;

  	struct ioc *ioc = &sba_dev->ioc[0];	/* FIXME: Multi-IOC support! */

  	unsigned int *res_ptr = (unsigned int *)ioc->res_map;

  	int i, len = 0;

  	for (i = 0; i < (ioc->res_size/sizeof(unsigned int)); ++i, ++res_ptr) {

  		if ((i & 7) == 0)

  			len += seq_printf(m, "
     ");
  		len += seq_printf(m, " %08x", *res_ptr);

  	}

  	len += seq_printf(m, "
  ");

  	return 0;

  }

  
  static int
  sba_proc_bitmap_open(struct inode *i, struct file *f)
  {
  	return single_open(f, &sba_proc_bitmap_info, NULL);
  }

  static const struct file_operations sba_proc_bitmap_fops = {

  	.owner = THIS_MODULE,
  	.open = sba_proc_bitmap_open,
  	.read = seq_read,
  	.llseek = seq_lseek,
  	.release = single_release,
  };

  #endif /* CONFIG_PROC_FS */
  
  static struct parisc_device_id sba_tbl[] = {
  	{ HPHW_IOA, HVERSION_REV_ANY_ID, ASTRO_RUNWAY_PORT, 0xb },
  	{ HPHW_BCPORT, HVERSION_REV_ANY_ID, IKE_MERCED_PORT, 0xc },
  	{ HPHW_BCPORT, HVERSION_REV_ANY_ID, REO_MERCED_PORT, 0xc },
  	{ HPHW_BCPORT, HVERSION_REV_ANY_ID, REOG_MERCED_PORT, 0xc },
  	{ HPHW_IOA, HVERSION_REV_ANY_ID, PLUTO_MCKINLEY_PORT, 0xc },
  	{ 0, }
  };

  static int sba_driver_callback(struct parisc_device *);

  
  static struct parisc_driver sba_driver = {
  	.name =		MODULE_NAME,
  	.id_table =	sba_tbl,
  	.probe =	sba_driver_callback,
  };
  
  /*
  ** Determine if sba should claim this chip (return 0) or not (return 1).
  ** If so, initialize the chip and tell other partners in crime they
  ** have work to do.
  */

  static int sba_driver_callback(struct parisc_device *dev)

  {
  	struct sba_device *sba_dev;
  	u32 func_class;
  	int i;
  	char *version;

  	void __iomem *sba_addr = ioremap_nocache(dev->hpa.start, SBA_FUNC_SIZE);

  #ifdef CONFIG_PROC_FS
  	struct proc_dir_entry *root;
  #endif

  
  	sba_dump_ranges(sba_addr);
  
  	/* Read HW Rev First */
  	func_class = READ_REG(sba_addr + SBA_FCLASS);

  	if (IS_ASTRO(dev)) {

  		unsigned long fclass;
  		static char astro_rev[]="Astro ?.?";
  
  		/* Astro is broken...Read HW Rev First */
  		fclass = READ_REG(sba_addr);
  
  		astro_rev[6] = '1' + (char) (fclass & 0x7);
  		astro_rev[8] = '0' + (char) ((fclass & 0x18) >> 3);
  		version = astro_rev;

  	} else if (IS_IKE(dev)) {

  		static char ike_rev[] = "Ike rev ?";
  		ike_rev[8] = '0' + (char) (func_class & 0xff);
  		version = ike_rev;

  	} else if (IS_PLUTO(dev)) {

  		static char pluto_rev[]="Pluto ?.?";
  		pluto_rev[6] = '0' + (char) ((func_class & 0xf0) >> 4); 
  		pluto_rev[8] = '0' + (char) (func_class & 0x0f); 
  		version = pluto_rev;
  	} else {
  		static char reo_rev[] = "REO rev ?";
  		reo_rev[8] = '0' + (char) (func_class & 0xff);
  		version = reo_rev;
  	}
  
  	if (!global_ioc_cnt) {
  		global_ioc_cnt = count_parisc_driver(&sba_driver);
  
  		/* Astro and Pluto have one IOC per SBA */

  		if ((!IS_ASTRO(dev)) || (!IS_PLUTO(dev)))

  			global_ioc_cnt *= 2;
  	}

  	printk(KERN_INFO "%s found %s at 0x%llx
  ",
  		MODULE_NAME, version, (unsigned long long)dev->hpa.start);

  	sba_dev = kzalloc(sizeof(struct sba_device), GFP_KERNEL);

  	if (!sba_dev) {
  		printk(KERN_ERR MODULE_NAME " - couldn't alloc sba_device
  ");
  		return -ENOMEM;
  	}
  
  	parisc_set_drvdata(dev, sba_dev);

  
  	for(i=0; i<MAX_IOC; i++)
  		spin_lock_init(&(sba_dev->ioc[i].res_lock));
  
  	sba_dev->dev = dev;
  	sba_dev->hw_rev = func_class;

  	sba_dev->name = dev->name;
  	sba_dev->sba_hpa = sba_addr;
  
  	sba_get_pat_resources(sba_dev);
  	sba_hw_init(sba_dev);
  	sba_common_init(sba_dev);
  
  	hppa_dma_ops = &sba_ops;
  
  #ifdef CONFIG_PROC_FS

  	switch (dev->id.hversion) {
  	case PLUTO_MCKINLEY_PORT:
  		root = proc_mckinley_root;
  		break;
  	case ASTRO_RUNWAY_PORT:
  	case IKE_MERCED_PORT:
  	default:
  		root = proc_runway_root;
  		break;

  	}

  	proc_create("sba_iommu", 0, root, &sba_proc_fops);
  	proc_create("sba_iommu-bitmap", 0, root, &sba_proc_bitmap_fops);

  #endif

  	parisc_has_iommu();
  	return 0;
  }
  
  /*
  ** One time initialization to let the world know the SBA was found.
  ** This is the only routine which is NOT static.
  ** Must be called exactly once before pci_init().
  */
  void __init sba_init(void)
  {
  	register_parisc_driver(&sba_driver);
  }
  
  
  /**
   * sba_get_iommu - Assign the iommu pointer for the pci bus controller.
   * @dev: The parisc device.
   *
   * Returns the appropriate IOMMU data for the given parisc PCI controller.
   * This is cached and used later for PCI DMA Mapping.
   */
  void * sba_get_iommu(struct parisc_device *pci_hba)
  {
  	struct parisc_device *sba_dev = parisc_parent(pci_hba);

  	struct sba_device *sba = dev_get_drvdata(&sba_dev->dev);

  	char t = sba_dev->id.hw_type;
  	int iocnum = (pci_hba->hw_path >> 3);	/* rope # */
  
  	WARN_ON((t != HPHW_IOA) && (t != HPHW_BCPORT));
  
  	return &(sba->ioc[iocnum]);
  }
  
  
  /**
   * sba_directed_lmmio - return first directed LMMIO range routed to rope
   * @pa_dev: The parisc device.
   * @r: resource PCI host controller wants start/end fields assigned.
   *
   * For the given parisc PCI controller, determine if any direct ranges
   * are routed down the corresponding rope.
   */
  void sba_directed_lmmio(struct parisc_device *pci_hba, struct resource *r)
  {
  	struct parisc_device *sba_dev = parisc_parent(pci_hba);

  	struct sba_device *sba = dev_get_drvdata(&sba_dev->dev);

  	char t = sba_dev->id.hw_type;
  	int i;
  	int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1));  /* rope # */

  	BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT));

  
  	r->start = r->end = 0;
  
  	/* Astro has 4 directed ranges. Not sure about Ike/Pluto/et al */
  	for (i=0; i<4; i++) {
  		int base, size;
  		void __iomem *reg = sba->sba_hpa + i*0x18;
  
  		base = READ_REG32(reg + LMMIO_DIRECT0_BASE);
  		if ((base & 1) == 0)
  			continue;	/* not enabled */
  
  		size = READ_REG32(reg + LMMIO_DIRECT0_ROUTE);
  
  		if ((size & (ROPES_PER_IOC-1)) != rope)
  			continue;	/* directed down different rope */
  		
  		r->start = (base & ~1UL) | PCI_F_EXTEND;
  		size = ~ READ_REG32(reg + LMMIO_DIRECT0_MASK);
  		r->end = r->start + size;

  		r->flags = IORESOURCE_MEM;

  	}
  }
  
  
  /**
   * sba_distributed_lmmio - return portion of distributed LMMIO range
   * @pa_dev: The parisc device.
   * @r: resource PCI host controller wants start/end fields assigned.
   *
   * For the given parisc PCI controller, return portion of distributed LMMIO
   * range. The distributed LMMIO is always present and it's just a question
   * of the base address and size of the range.
   */
  void sba_distributed_lmmio(struct parisc_device *pci_hba, struct resource *r )
  {
  	struct parisc_device *sba_dev = parisc_parent(pci_hba);

  	struct sba_device *sba = dev_get_drvdata(&sba_dev->dev);

  	char t = sba_dev->id.hw_type;
  	int base, size;
  	int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1));  /* rope # */

  	BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT));

  
  	r->start = r->end = 0;
  
  	base = READ_REG32(sba->sba_hpa + LMMIO_DIST_BASE);
  	if ((base & 1) == 0) {
  		BUG();	/* Gah! Distr Range wasn't enabled! */
  		return;
  	}
  
  	r->start = (base & ~1UL) | PCI_F_EXTEND;
  
  	size = (~READ_REG32(sba->sba_hpa + LMMIO_DIST_MASK)) / ROPES_PER_IOC;
  	r->start += rope * (size + 1);	/* adjust base for this rope */
  	r->end = r->start + size;

  	r->flags = IORESOURCE_MEM;

  }