/*
  **
  **  PCI Lower Bus Adapter (LBA) manager
  **
  **	(c) Copyright 1999,2000 Grant Grundler
  **	(c) Copyright 1999,2000 Hewlett-Packard Company
  **
  **	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 primarily provides access to PCI bus (config/IOport
  ** spaces) on platforms with an SBA/LBA chipset. A/B/C/J/L/N-class
  ** with 4 digit model numbers - eg C3000 (and A400...sigh).
  **
  ** LBA driver isn't as simple as the Dino driver because:
  **   (a) this chip has substantial bug fixes between revisions
  **       (Only one Dino bug has a software workaround :^(  )
  **   (b) has more options which we don't (yet) support (DMA hints, OLARD)
  **   (c) IRQ support lives in the I/O SAPIC driver (not with PCI driver)
  **   (d) play nicely with both PAT and "Legacy" PA-RISC firmware (PDC).
  **       (dino only deals with "Legacy" PDC)
  **
  ** LBA driver passes the I/O SAPIC HPA to the I/O SAPIC driver.
  ** (I/O SAPIC is integratd in the LBA chip).
  **
  ** FIXME: Add support to SBA and LBA drivers for DMA hint sets
  ** FIXME: Add support for PCI card hot-plug (OLARD).
  */
  
  #include <linux/delay.h>
  #include <linux/types.h>
  #include <linux/kernel.h>
  #include <linux/spinlock.h>
  #include <linux/init.h>		/* for __init */
  #include <linux/pci.h>
  #include <linux/ioport.h>
  #include <linux/slab.h>
  
  #include <asm/byteorder.h>
  #include <asm/pdc.h>
  #include <asm/pdcpat.h>
  #include <asm/page.h>
  
  #include <asm/ropes.h>
  #include <asm/hardware.h>	/* for register_parisc_driver() stuff */
  #include <asm/parisc-device.h>
  #include <asm/io.h>		/* read/write stuff */
  
  #undef DEBUG_LBA	/* general stuff */
  #undef DEBUG_LBA_PORT	/* debug I/O Port access */
  #undef DEBUG_LBA_CFG	/* debug Config Space Access (ie PCI Bus walk) */
  #undef DEBUG_LBA_PAT	/* debug PCI Resource Mgt code - PDC PAT only */
  
  #undef FBB_SUPPORT	/* Fast Back-Back xfers - NOT READY YET */
  
  
  #ifdef DEBUG_LBA
  #define DBG(x...)	printk(x)
  #else
  #define DBG(x...)
  #endif
  
  #ifdef DEBUG_LBA_PORT
  #define DBG_PORT(x...)	printk(x)
  #else
  #define DBG_PORT(x...)
  #endif
  
  #ifdef DEBUG_LBA_CFG
  #define DBG_CFG(x...)	printk(x)
  #else
  #define DBG_CFG(x...)
  #endif
  
  #ifdef DEBUG_LBA_PAT
  #define DBG_PAT(x...)	printk(x)
  #else
  #define DBG_PAT(x...)
  #endif
  
  
  /*
  ** Config accessor functions only pass in the 8-bit bus number and not
  ** the 8-bit "PCI Segment" number. Each LBA will be assigned a PCI bus
  ** number based on what firmware wrote into the scratch register.
  **
  ** The "secondary" bus number is set to this before calling
  ** pci_register_ops(). If any PPB's are present, the scan will
  ** discover them and update the "secondary" and "subordinate"
  ** fields in the pci_bus structure.
  **
  ** Changes in the configuration *may* result in a different
  ** bus number for each LBA depending on what firmware does.
  */
  
  #define MODULE_NAME "LBA"
  
  /* non-postable I/O port space, densely packed */
  #define LBA_PORT_BASE	(PCI_F_EXTEND | 0xfee00000UL)
  static void __iomem *astro_iop_base __read_mostly;
  
  static u32 lba_t32;
  
  /* lba flags */
  #define LBA_FLAG_SKIP_PROBE	0x10
  
  #define LBA_SKIP_PROBE(d) ((d)->flags & LBA_FLAG_SKIP_PROBE)
  
  
  /* Looks nice and keeps the compiler happy */
  #define LBA_DEV(d) ((struct lba_device *) (d))
  
  
  /*
  ** Only allow 8 subsidiary busses per LBA
  ** Problem is the PCI bus numbering is globally shared.
  */
  #define LBA_MAX_NUM_BUSES 8
  
  /************************************
   * LBA register read and write support
   *
   * BE WARNED: register writes are posted.
   *  (ie follow writes which must reach HW with a read)
   */
  #define READ_U8(addr)  __raw_readb(addr)
  #define READ_U16(addr) __raw_readw(addr)
  #define READ_U32(addr) __raw_readl(addr)
  #define WRITE_U8(value, addr)  __raw_writeb(value, addr)
  #define WRITE_U16(value, addr) __raw_writew(value, addr)
  #define WRITE_U32(value, addr) __raw_writel(value, addr)
  
  #define READ_REG8(addr)  readb(addr)
  #define READ_REG16(addr) readw(addr)
  #define READ_REG32(addr) readl(addr)
  #define READ_REG64(addr) readq(addr)
  #define WRITE_REG8(value, addr)  writeb(value, addr)
  #define WRITE_REG16(value, addr) writew(value, addr)
  #define WRITE_REG32(value, addr) writel(value, addr)
  
  
  #define LBA_CFG_TOK(bus,dfn) ((u32) ((bus)<<16 | (dfn)<<8))
  #define LBA_CFG_BUS(tok)  ((u8) ((tok)>>16))
  #define LBA_CFG_DEV(tok)  ((u8) ((tok)>>11) & 0x1f)
  #define LBA_CFG_FUNC(tok) ((u8) ((tok)>>8 ) & 0x7)
  
  
  /*
  ** Extract LBA (Rope) number from HPA
  ** REVISIT: 16 ropes for Stretch/Ike?
  */
  #define ROPES_PER_IOC	8
  #define LBA_NUM(x)    ((((unsigned long) x) >> 13) & (ROPES_PER_IOC-1))
  
  
  static void
  lba_dump_res(struct resource *r, int d)
  {
  	int i;
  
  	if (NULL == r)
  		return;
  
  	printk(KERN_DEBUG "(%p)", r->parent);
  	for (i = d; i ; --i) printk(" ");
  	printk(KERN_DEBUG "%p [%lx,%lx]/%lx
  ", r,
  		(long)r->start, (long)r->end, r->flags);
  	lba_dump_res(r->child, d+2);
  	lba_dump_res(r->sibling, d);
  }
  
  
  /*
  ** LBA rev 2.0, 2.1, 2.2, and 3.0 bus walks require a complex
  ** workaround for cfg cycles:
  **	-- preserve  LBA state
  **	-- prevent any DMA from occurring
  **	-- turn on smart mode
  **	-- probe with config writes before doing config reads
  **	-- check ERROR_STATUS
  **	-- clear ERROR_STATUS
  **	-- restore LBA state
  **
  ** The workaround is only used for device discovery.
  */
  
  static int lba_device_present(u8 bus, u8 dfn, struct lba_device *d)
  {
  	u8 first_bus = d->hba.hba_bus->busn_res.start;
  	u8 last_sub_bus = d->hba.hba_bus->busn_res.end;
  
  	if ((bus < first_bus) ||
  	    (bus > last_sub_bus) ||
  	    ((bus - first_bus) >= LBA_MAX_NUM_BUSES)) {
  		return 0;
  	}
  
  	return 1;
  }
  
  
  
  #define LBA_CFG_SETUP(d, tok) {				\
      /* Save contents of error config register.  */			\
      error_config = READ_REG32(d->hba.base_addr + LBA_ERROR_CONFIG);		\
  \
      /* Save contents of status control register.  */			\
      status_control = READ_REG32(d->hba.base_addr + LBA_STAT_CTL);		\
  \
      /* For LBA rev 2.0, 2.1, 2.2, and 3.0, we must disable DMA		\
      ** arbitration for full bus walks.					\
      */									\
  	/* Save contents of arb mask register. */			\
  	arb_mask = READ_REG32(d->hba.base_addr + LBA_ARB_MASK);		\
  \
  	/*								\
  	 * Turn off all device arbitration bits (i.e. everything	\
  	 * except arbitration enable bit).				\
  	 */								\
  	WRITE_REG32(0x1, d->hba.base_addr + LBA_ARB_MASK);		\
  \
      /*									\
       * Set the smart mode bit so that master aborts don't cause		\
       * LBA to go into PCI fatal mode (required).			\
       */									\
      WRITE_REG32(error_config | LBA_SMART_MODE, d->hba.base_addr + LBA_ERROR_CONFIG);	\
  }
  
  
  #define LBA_CFG_PROBE(d, tok) {				\
      /*									\
       * Setup Vendor ID write and read back the address register		\
       * to make sure that LBA is the bus master.				\
       */									\
      WRITE_REG32(tok | PCI_VENDOR_ID, (d)->hba.base_addr + LBA_PCI_CFG_ADDR);\
      /*									\
       * Read address register to ensure that LBA is the bus master,	\
       * which implies that DMA traffic has stopped when DMA arb is off.	\
       */									\
      lba_t32 = READ_REG32((d)->hba.base_addr + LBA_PCI_CFG_ADDR);	\
      /*									\
       * Generate a cfg write cycle (will have no affect on		\
       * Vendor ID register since read-only).				\
       */									\
      WRITE_REG32(~0, (d)->hba.base_addr + LBA_PCI_CFG_DATA);		\
      /*									\
       * Make sure write has completed before proceeding further,		\
       * i.e. before setting clear enable.				\
       */									\
      lba_t32 = READ_REG32((d)->hba.base_addr + LBA_PCI_CFG_ADDR);	\
  }
  
  
  /*
   * HPREVISIT:
   *   -- Can't tell if config cycle got the error.
   *
   *		OV bit is broken until rev 4.0, so can't use OV bit and
   *		LBA_ERROR_LOG_ADDR to tell if error belongs to config cycle.
   *
   *		As of rev 4.0, no longer need the error check.
   *
   *   -- Even if we could tell, we still want to return -1
   *	for **ANY** error (not just master abort).
   *
   *   -- Only clear non-fatal errors (we don't want to bring
   *	LBA out of pci-fatal mode).
   *
   *		Actually, there is still a race in which
   *		we could be clearing a fatal error.  We will
   *		live with this during our initial bus walk
   *		until rev 4.0 (no driver activity during
   *		initial bus walk).  The initial bus walk
   *		has race conditions concerning the use of
   *		smart mode as well.
   */
  
  #define LBA_MASTER_ABORT_ERROR 0xc
  #define LBA_FATAL_ERROR 0x10
  
  #define LBA_CFG_MASTER_ABORT_CHECK(d, base, tok, error) {		\
      u32 error_status = 0;						\
      /*									\
       * Set clear enable (CE) bit. Unset by HW when new			\
       * errors are logged -- LBA HW ERS section 14.3.3).		\
       */									\
      WRITE_REG32(status_control | CLEAR_ERRLOG_ENABLE, base + LBA_STAT_CTL); \
      error_status = READ_REG32(base + LBA_ERROR_STATUS);		\
      if ((error_status & 0x1f) != 0) {					\
  	/*								\
  	 * Fail the config read request.				\
  	 */								\
  	error = 1;							\
  	if ((error_status & LBA_FATAL_ERROR) == 0) {			\
  	    /*								\
  	     * Clear error status (if fatal bit not set) by setting	\
  	     * clear error log bit (CL).				\
  	     */								\
  	    WRITE_REG32(status_control | CLEAR_ERRLOG, base + LBA_STAT_CTL); \
  	}								\
      }									\
  }
  
  #define LBA_CFG_TR4_ADDR_SETUP(d, addr)					\
  	WRITE_REG32(((addr) & ~3), (d)->hba.base_addr + LBA_PCI_CFG_ADDR);
  
  #define LBA_CFG_ADDR_SETUP(d, addr) {					\
      WRITE_REG32(((addr) & ~3), (d)->hba.base_addr + LBA_PCI_CFG_ADDR);	\
      /*									\
       * Read address register to ensure that LBA is the bus master,	\
       * which implies that DMA traffic has stopped when DMA arb is off.	\
       */									\
      lba_t32 = READ_REG32((d)->hba.base_addr + LBA_PCI_CFG_ADDR);	\
  }
  
  
  #define LBA_CFG_RESTORE(d, base) {					\
      /*									\
       * Restore status control register (turn off clear enable).		\
       */									\
      WRITE_REG32(status_control, base + LBA_STAT_CTL);			\
      /*									\
       * Restore error config register (turn off smart mode).		\
       */									\
      WRITE_REG32(error_config, base + LBA_ERROR_CONFIG);			\
  	/*								\
  	 * Restore arb mask register (reenables DMA arbitration).	\
  	 */								\
  	WRITE_REG32(arb_mask, base + LBA_ARB_MASK);			\
  }
  
  
  
  static unsigned int
  lba_rd_cfg(struct lba_device *d, u32 tok, u8 reg, u32 size)
  {
  	u32 data = ~0U;
  	int error = 0;
  	u32 arb_mask = 0;	/* used by LBA_CFG_SETUP/RESTORE */
  	u32 error_config = 0;	/* used by LBA_CFG_SETUP/RESTORE */
  	u32 status_control = 0;	/* used by LBA_CFG_SETUP/RESTORE */
  
  	LBA_CFG_SETUP(d, tok);
  	LBA_CFG_PROBE(d, tok);
  	LBA_CFG_MASTER_ABORT_CHECK(d, d->hba.base_addr, tok, error);
  	if (!error) {
  		void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;
  
  		LBA_CFG_ADDR_SETUP(d, tok | reg);
  		switch (size) {
  		case 1: data = (u32) READ_REG8(data_reg + (reg & 3)); break;
  		case 2: data = (u32) READ_REG16(data_reg+ (reg & 2)); break;
  		case 4: data = READ_REG32(data_reg); break;
  		}
  	}
  	LBA_CFG_RESTORE(d, d->hba.base_addr);
  	return(data);
  }
  
  
  static int elroy_cfg_read(struct pci_bus *bus, unsigned int devfn, int pos, int size, u32 *data)
  {
  	struct lba_device *d = LBA_DEV(parisc_walk_tree(bus->bridge));
  	u32 local_bus = (bus->parent == NULL) ? 0 : bus->busn_res.start;
  	u32 tok = LBA_CFG_TOK(local_bus, devfn);
  	void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;
  
  	if ((pos > 255) || (devfn > 255))
  		return -EINVAL;
  
  /* FIXME: B2K/C3600 workaround is always use old method... */
  	/* if (!LBA_SKIP_PROBE(d)) */ {
  		/* original - Generate config cycle on broken elroy
  		  with risk we will miss PCI bus errors. */
  		*data = lba_rd_cfg(d, tok, pos, size);
  		DBG_CFG("%s(%x+%2x) -> 0x%x (a)
  ", __func__, tok, pos, *data);
  		return 0;
  	}
  
  	if (LBA_SKIP_PROBE(d) && !lba_device_present(bus->busn_res.start, devfn, d)) {
  		DBG_CFG("%s(%x+%2x) -> -1 (b)
  ", __func__, tok, pos);
  		/* either don't want to look or know device isn't present. */
  		*data = ~0U;
  		return(0);
  	}
  
  	/* Basic Algorithm
  	** Should only get here on fully working LBA rev.
  	** This is how simple the code should have been.
  	*/
  	LBA_CFG_ADDR_SETUP(d, tok | pos);
  	switch(size) {
  	case 1: *data = READ_REG8 (data_reg + (pos & 3)); break;
  	case 2: *data = READ_REG16(data_reg + (pos & 2)); break;
  	case 4: *data = READ_REG32(data_reg); break;
  	}
  	DBG_CFG("%s(%x+%2x) -> 0x%x (c)
  ", __func__, tok, pos, *data);
  	return 0;
  }
  
  
  static void
  lba_wr_cfg(struct lba_device *d, u32 tok, u8 reg, u32 data, u32 size)
  {
  	int error = 0;
  	u32 arb_mask = 0;
  	u32 error_config = 0;
  	u32 status_control = 0;
  	void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;
  
  	LBA_CFG_SETUP(d, tok);
  	LBA_CFG_ADDR_SETUP(d, tok | reg);
  	switch (size) {
  	case 1: WRITE_REG8 (data, data_reg + (reg & 3)); break;
  	case 2: WRITE_REG16(data, data_reg + (reg & 2)); break;
  	case 4: WRITE_REG32(data, data_reg);             break;
  	}
  	LBA_CFG_MASTER_ABORT_CHECK(d, d->hba.base_addr, tok, error);
  	LBA_CFG_RESTORE(d, d->hba.base_addr);
  }
  
  
  /*
   * LBA 4.0 config write code implements non-postable semantics
   * by doing a read of CONFIG ADDR after the write.
   */
  
  static int elroy_cfg_write(struct pci_bus *bus, unsigned int devfn, int pos, int size, u32 data)
  {
  	struct lba_device *d = LBA_DEV(parisc_walk_tree(bus->bridge));
  	u32 local_bus = (bus->parent == NULL) ? 0 : bus->busn_res.start;
  	u32 tok = LBA_CFG_TOK(local_bus,devfn);
  
  	if ((pos > 255) || (devfn > 255))
  		return -EINVAL;
  
  	if (!LBA_SKIP_PROBE(d)) {
  		/* Original Workaround */
  		lba_wr_cfg(d, tok, pos, (u32) data, size);
  		DBG_CFG("%s(%x+%2x) = 0x%x (a)
  ", __func__, tok, pos,data);
  		return 0;
  	}
  
  	if (LBA_SKIP_PROBE(d) && (!lba_device_present(bus->busn_res.start, devfn, d))) {
  		DBG_CFG("%s(%x+%2x) = 0x%x (b)
  ", __func__, tok, pos,data);
  		return 1; /* New Workaround */
  	}
  
  	DBG_CFG("%s(%x+%2x) = 0x%x (c)
  ", __func__, tok, pos, data);
  
  	/* Basic Algorithm */
  	LBA_CFG_ADDR_SETUP(d, tok | pos);
  	switch(size) {
  	case 1: WRITE_REG8 (data, d->hba.base_addr + LBA_PCI_CFG_DATA + (pos & 3));
  		   break;
  	case 2: WRITE_REG16(data, d->hba.base_addr + LBA_PCI_CFG_DATA + (pos & 2));
  		   break;
  	case 4: WRITE_REG32(data, d->hba.base_addr + LBA_PCI_CFG_DATA);
  		   break;
  	}
  	/* flush posted write */
  	lba_t32 = READ_REG32(d->hba.base_addr + LBA_PCI_CFG_ADDR);
  	return 0;
  }
  
  
  static struct pci_ops elroy_cfg_ops = {
  	.read =		elroy_cfg_read,
  	.write =	elroy_cfg_write,
  };
  
  /*
   * The mercury_cfg_ops are slightly misnamed; they're also used for Elroy
   * TR4.0 as no additional bugs were found in this areea between Elroy and
   * Mercury
   */
  
  static int mercury_cfg_read(struct pci_bus *bus, unsigned int devfn, int pos, int size, u32 *data)
  {
  	struct lba_device *d = LBA_DEV(parisc_walk_tree(bus->bridge));
  	u32 local_bus = (bus->parent == NULL) ? 0 : bus->busn_res.start;
  	u32 tok = LBA_CFG_TOK(local_bus, devfn);
  	void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;
  
  	if ((pos > 255) || (devfn > 255))
  		return -EINVAL;
  
  	LBA_CFG_TR4_ADDR_SETUP(d, tok | pos);
  	switch(size) {
  	case 1:
  		*data = READ_REG8(data_reg + (pos & 3));
  		break;
  	case 2:
  		*data = READ_REG16(data_reg + (pos & 2));
  		break;
  	case 4:
  		*data = READ_REG32(data_reg);             break;
  		break;
  	}
  
  	DBG_CFG("mercury_cfg_read(%x+%2x) -> 0x%x
  ", tok, pos, *data);
  	return 0;
  }
  
  /*
   * LBA 4.0 config write code implements non-postable semantics
   * by doing a read of CONFIG ADDR after the write.
   */
  
  static int mercury_cfg_write(struct pci_bus *bus, unsigned int devfn, int pos, int size, u32 data)
  {
  	struct lba_device *d = LBA_DEV(parisc_walk_tree(bus->bridge));
  	void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;
  	u32 local_bus = (bus->parent == NULL) ? 0 : bus->busn_res.start;
  	u32 tok = LBA_CFG_TOK(local_bus,devfn);
  
  	if ((pos > 255) || (devfn > 255))
  		return -EINVAL;
  
  	DBG_CFG("%s(%x+%2x) <- 0x%x (c)
  ", __func__, tok, pos, data);
  
  	LBA_CFG_TR4_ADDR_SETUP(d, tok | pos);
  	switch(size) {
  	case 1:
  		WRITE_REG8 (data, data_reg + (pos & 3));
  		break;
  	case 2:
  		WRITE_REG16(data, data_reg + (pos & 2));
  		break;
  	case 4:
  		WRITE_REG32(data, data_reg);
  		break;
  	}
  
  	/* flush posted write */
  	lba_t32 = READ_U32(d->hba.base_addr + LBA_PCI_CFG_ADDR);
  	return 0;
  }
  
  static struct pci_ops mercury_cfg_ops = {
  	.read =		mercury_cfg_read,
  	.write =	mercury_cfg_write,
  };
  
  
  static void
  lba_bios_init(void)
  {
  	DBG(MODULE_NAME ": lba_bios_init
  ");
  }
  
  
  #ifdef CONFIG_64BIT
  
  /*
   * truncate_pat_collision:  Deal with overlaps or outright collisions
   *			between PAT PDC reported ranges.
   *
   *   Broken PA8800 firmware will report lmmio range that
   *   overlaps with CPU HPA. Just truncate the lmmio range.
   *
   *   BEWARE: conflicts with this lmmio range may be an
   *   elmmio range which is pointing down another rope.
   *
   *  FIXME: only deals with one collision per range...theoretically we
   *  could have several. Supporting more than one collision will get messy.
   */
  static unsigned long
  truncate_pat_collision(struct resource *root, struct resource *new)
  {
  	unsigned long start = new->start;
  	unsigned long end = new->end;
  	struct resource *tmp = root->child;
  
  	if (end <= start || start < root->start || !tmp)
  		return 0;
  
  	/* find first overlap */
  	while (tmp && tmp->end < start)
  		tmp = tmp->sibling;
  
  	/* no entries overlap */
  	if (!tmp)  return 0;
  
  	/* found one that starts behind the new one
  	** Don't need to do anything.
  	*/
  	if (tmp->start >= end) return 0;
  
  	if (tmp->start <= start) {
  		/* "front" of new one overlaps */
  		new->start = tmp->end + 1;
  
  		if (tmp->end >= end) {
  			/* AACCKK! totally overlaps! drop this range. */
  			return 1;
  		}
  	} 
  
  	if (tmp->end < end ) {
  		/* "end" of new one overlaps */
  		new->end = tmp->start - 1;
  	}
  
  	printk(KERN_WARNING "LBA: Truncating lmmio_space [%lx/%lx] "
  					"to [%lx,%lx]
  ",
  			start, end,
  			(long)new->start, (long)new->end );
  
  	return 0;	/* truncation successful */
  }
  
  /*
   * extend_lmmio_len: extend lmmio range to maximum length
   *
   * This is needed at least on C8000 systems to get the ATI FireGL card
   * working. On other systems we will currently not extend the lmmio space.
   */
  static unsigned long
  extend_lmmio_len(unsigned long start, unsigned long end, unsigned long lba_len)
  {
  	struct resource *tmp;
  
  	pr_debug("LMMIO mismatch: PAT length = 0x%lx, MASK register = 0x%lx
  ",
  		end - start, lba_len);
  
  	lba_len = min(lba_len+1, 256UL*1024*1024); /* limit to 256 MB */
  
  	pr_debug("LBA: lmmio_space [0x%lx-0x%lx] - original
  ", start, end);
  
  	if (boot_cpu_data.cpu_type < mako) {
  		pr_info("LBA: Not a C8000 system - not extending LMMIO range.
  ");
  		return end;
  	}
  
  	end += lba_len;
  	if (end < start) /* fix overflow */
  		end = -1ULL;
  
  	pr_debug("LBA: lmmio_space [0x%lx-0x%lx] - current
  ", start, end);
  
  	/* first overlap */
  	for (tmp = iomem_resource.child; tmp; tmp = tmp->sibling) {
  		pr_debug("LBA: testing %pR
  ", tmp);
  		if (tmp->start == start)
  			continue; /* ignore ourself */
  		if (tmp->end < start)
  			continue;
  		if (tmp->start > end)
  			continue;
  		if (end >= tmp->start)
  			end = tmp->start - 1;
  	}
  
  	pr_info("LBA: lmmio_space [0x%lx-0x%lx] - new
  ", start, end);
  
  	/* return new end */
  	return end;
  }
  
  #else
  #define truncate_pat_collision(r,n)  (0)
  #endif
  
  /*
  ** The algorithm is generic code.
  ** But it needs to access local data structures to get the IRQ base.
  ** Could make this a "pci_fixup_irq(bus, region)" but not sure
  ** it's worth it.
  **
  ** Called by do_pci_scan_bus() immediately after each PCI bus is walked.
  ** Resources aren't allocated until recursive buswalk below HBA is completed.
  */
  static void
  lba_fixup_bus(struct pci_bus *bus)
  {
  	struct pci_dev *dev;
  #ifdef FBB_SUPPORT
  	u16 status;
  #endif
  	struct lba_device *ldev = LBA_DEV(parisc_walk_tree(bus->bridge));
  
  	DBG("lba_fixup_bus(0x%p) bus %d platform_data 0x%p
  ",
  		bus, (int)bus->busn_res.start, bus->bridge->platform_data);
  
  	/*
  	** Properly Setup MMIO resources for this bus.
  	** pci_alloc_primary_bus() mangles this.
  	*/
  	if (bus->parent) {
  		int i;
  		/* PCI-PCI Bridge */
  		pci_read_bridge_bases(bus);
  		for (i = PCI_BRIDGE_RESOURCES; i < PCI_NUM_RESOURCES; i++) {
  			pci_claim_resource(bus->self, i);
  		}
  	} else {
  		/* Host-PCI Bridge */
  		int err;
  
  		DBG("lba_fixup_bus() %s [%lx/%lx]/%lx
  ",
  			ldev->hba.io_space.name,
  			ldev->hba.io_space.start, ldev->hba.io_space.end,
  			ldev->hba.io_space.flags);
  		DBG("lba_fixup_bus() %s [%lx/%lx]/%lx
  ",
  			ldev->hba.lmmio_space.name,
  			ldev->hba.lmmio_space.start, ldev->hba.lmmio_space.end,
  			ldev->hba.lmmio_space.flags);
  
  		err = request_resource(&ioport_resource, &(ldev->hba.io_space));
  		if (err < 0) {
  			lba_dump_res(&ioport_resource, 2);
  			BUG();
  		}
  
  		if (ldev->hba.elmmio_space.flags) {
  			err = request_resource(&iomem_resource,
  					&(ldev->hba.elmmio_space));
  			if (err < 0) {
  
  				printk("FAILED: lba_fixup_bus() request for "
  						"elmmio_space [%lx/%lx]
  ",
  						(long)ldev->hba.elmmio_space.start,
  						(long)ldev->hba.elmmio_space.end);
  
  				/* lba_dump_res(&iomem_resource, 2); */
  				/* BUG(); */
  			}
  		}
  
  		if (ldev->hba.lmmio_space.flags) {
  			err = request_resource(&iomem_resource, &(ldev->hba.lmmio_space));
  			if (err < 0) {
  				printk(KERN_ERR "FAILED: lba_fixup_bus() request for "
  					"lmmio_space [%lx/%lx]
  ",
  					(long)ldev->hba.lmmio_space.start,
  					(long)ldev->hba.lmmio_space.end);
  			}
  		}
  
  #ifdef CONFIG_64BIT
  		/* GMMIO is  distributed range. Every LBA/Rope gets part it. */
  		if (ldev->hba.gmmio_space.flags) {
  			err = request_resource(&iomem_resource, &(ldev->hba.gmmio_space));
  			if (err < 0) {
  				printk("FAILED: lba_fixup_bus() request for "
  					"gmmio_space [%lx/%lx]
  ",
  					(long)ldev->hba.gmmio_space.start,
  					(long)ldev->hba.gmmio_space.end);
  				lba_dump_res(&iomem_resource, 2);
  				BUG();
  			}
  		}
  #endif
  
  	}
  
  	list_for_each_entry(dev, &bus->devices, bus_list) {
  		int i;
  
  		DBG("lba_fixup_bus() %s
  ", pci_name(dev));
  
  		/* Virtualize Device/Bridge Resources. */
  		for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) {
  			struct resource *res = &dev->resource[i];
  
  			/* If resource not allocated - skip it */
  			if (!res->start)
  				continue;
  
  			/*
  			** FIXME: this will result in whinging for devices
  			** that share expansion ROMs (think quad tulip), but
  			** isn't harmful.
  			*/
  			pci_claim_resource(dev, i);
  		}
  
  #ifdef FBB_SUPPORT
  		/*
  		** If one device does not support FBB transfers,
  		** No one on the bus can be allowed to use them.
  		*/
  		(void) pci_read_config_word(dev, PCI_STATUS, &status);
  		bus->bridge_ctl &= ~(status & PCI_STATUS_FAST_BACK);
  #endif
  
                  /*
  		** P2PB's have no IRQs. ignore them.
  		*/
  		if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)
  			continue;
  
  		/* Adjust INTERRUPT_LINE for this dev */
  		iosapic_fixup_irq(ldev->iosapic_obj, dev);
  	}
  
  #ifdef FBB_SUPPORT
  /* FIXME/REVISIT - finish figuring out to set FBB on both
  ** pci_setup_bridge() clobbers PCI_BRIDGE_CONTROL.
  ** Can't fixup here anyway....garr...
  */
  	if (fbb_enable) {
  		if (bus->parent) {
  			u8 control;
  			/* enable on PPB */
  			(void) pci_read_config_byte(bus->self, PCI_BRIDGE_CONTROL, &control);
  			(void) pci_write_config_byte(bus->self, PCI_BRIDGE_CONTROL, control | PCI_STATUS_FAST_BACK);
  
  		} else {
  			/* enable on LBA */
  		}
  		fbb_enable = PCI_COMMAND_FAST_BACK;
  	}
  
  	/* Lastly enable FBB/PERR/SERR on all devices too */
  	list_for_each_entry(dev, &bus->devices, bus_list) {
  		(void) pci_read_config_word(dev, PCI_COMMAND, &status);
  		status |= PCI_COMMAND_PARITY | PCI_COMMAND_SERR | fbb_enable;
  		(void) pci_write_config_word(dev, PCI_COMMAND, status);
  	}
  #endif
  }
  
  
  static struct pci_bios_ops lba_bios_ops = {
  	.init =		lba_bios_init,
  	.fixup_bus =	lba_fixup_bus,
  };
  
  
  
  
  /*******************************************************
  **
  ** LBA Sprockets "I/O Port" Space Accessor Functions
  **
  ** This set of accessor functions is intended for use with
  ** "legacy firmware" (ie Sprockets on Allegro/Forte boxes).
  **
  ** Many PCI devices don't require use of I/O port space (eg Tulip,
  ** NCR720) since they export the same registers to both MMIO and
  ** I/O port space. In general I/O port space is slower than
  ** MMIO since drivers are designed so PIO writes can be posted.
  **
  ********************************************************/
  
  #define LBA_PORT_IN(size, mask) \
  static u##size lba_astro_in##size (struct pci_hba_data *d, u16 addr) \
  { \
  	u##size t; \
  	t = READ_REG##size(astro_iop_base + addr); \
  	DBG_PORT(" 0x%x
  ", t); \
  	return (t); \
  }
  
  LBA_PORT_IN( 8, 3)
  LBA_PORT_IN(16, 2)
  LBA_PORT_IN(32, 0)
  
  
  
  /*
  ** BUG X4107:  Ordering broken - DMA RD return can bypass PIO WR
  **
  ** Fixed in Elroy 2.2. The READ_U32(..., LBA_FUNC_ID) below is
  ** guarantee non-postable completion semantics - not avoid X4107.
  ** The READ_U32 only guarantees the write data gets to elroy but
  ** out to the PCI bus. We can't read stuff from I/O port space
  ** since we don't know what has side-effects. Attempting to read
  ** from configuration space would be suicidal given the number of
  ** bugs in that elroy functionality.
  **
  **      Description:
  **          DMA read results can improperly pass PIO writes (X4107).  The
  **          result of this bug is that if a processor modifies a location in
  **          memory after having issued PIO writes, the PIO writes are not
  **          guaranteed to be completed before a PCI device is allowed to see
  **          the modified data in a DMA read.
  **
  **          Note that IKE bug X3719 in TR1 IKEs will result in the same
  **          symptom.
  **
  **      Workaround:
  **          The workaround for this bug is to always follow a PIO write with
  **          a PIO read to the same bus before starting DMA on that PCI bus.
  **
  */
  #define LBA_PORT_OUT(size, mask) \
  static void lba_astro_out##size (struct pci_hba_data *d, u16 addr, u##size val) \
  { \
  	DBG_PORT("%s(0x%p, 0x%x, 0x%x)
  ", __func__, d, addr, val); \
  	WRITE_REG##size(val, astro_iop_base + addr); \
  	if (LBA_DEV(d)->hw_rev < 3) \
  		lba_t32 = READ_U32(d->base_addr + LBA_FUNC_ID); \
  }
  
  LBA_PORT_OUT( 8, 3)
  LBA_PORT_OUT(16, 2)
  LBA_PORT_OUT(32, 0)
  
  
  static struct pci_port_ops lba_astro_port_ops = {
  	.inb =	lba_astro_in8,
  	.inw =	lba_astro_in16,
  	.inl =	lba_astro_in32,
  	.outb =	lba_astro_out8,
  	.outw =	lba_astro_out16,
  	.outl =	lba_astro_out32
  };
  
  
  #ifdef CONFIG_64BIT
  #define PIOP_TO_GMMIO(lba, addr) \
  	((lba)->iop_base + (((addr)&0xFFFC)<<10) + ((addr)&3))
  
  /*******************************************************
  **
  ** LBA PAT "I/O Port" Space Accessor Functions
  **
  ** This set of accessor functions is intended for use with
  ** "PAT PDC" firmware (ie Prelude/Rhapsody/Piranha boxes).
  **
  ** This uses the PIOP space located in the first 64MB of GMMIO.
  ** Each rope gets a full 64*KB* (ie 4 bytes per page) this way.
  ** bits 1:0 stay the same.  bits 15:2 become 25:12.
  ** Then add the base and we can generate an I/O Port cycle.
  ********************************************************/
  #undef LBA_PORT_IN
  #define LBA_PORT_IN(size, mask) \
  static u##size lba_pat_in##size (struct pci_hba_data *l, u16 addr) \
  { \
  	u##size t; \
  	DBG_PORT("%s(0x%p, 0x%x) ->", __func__, l, addr); \
  	t = READ_REG##size(PIOP_TO_GMMIO(LBA_DEV(l), addr)); \
  	DBG_PORT(" 0x%x
  ", t); \
  	return (t); \
  }
  
  LBA_PORT_IN( 8, 3)
  LBA_PORT_IN(16, 2)
  LBA_PORT_IN(32, 0)
  
  
  #undef LBA_PORT_OUT
  #define LBA_PORT_OUT(size, mask) \
  static void lba_pat_out##size (struct pci_hba_data *l, u16 addr, u##size val) \
  { \
  	void __iomem *where = PIOP_TO_GMMIO(LBA_DEV(l), addr); \
  	DBG_PORT("%s(0x%p, 0x%x, 0x%x)
  ", __func__, l, addr, val); \
  	WRITE_REG##size(val, where); \
  	/* flush the I/O down to the elroy at least */ \
  	lba_t32 = READ_U32(l->base_addr + LBA_FUNC_ID); \
  }
  
  LBA_PORT_OUT( 8, 3)
  LBA_PORT_OUT(16, 2)
  LBA_PORT_OUT(32, 0)
  
  
  static struct pci_port_ops lba_pat_port_ops = {
  	.inb =	lba_pat_in8,
  	.inw =	lba_pat_in16,
  	.inl =	lba_pat_in32,
  	.outb =	lba_pat_out8,
  	.outw =	lba_pat_out16,
  	.outl =	lba_pat_out32
  };
  
  
  
  /*
  ** make range information from PDC available to PCI subsystem.
  ** We make the PDC call here in order to get the PCI bus range
  ** numbers. The rest will get forwarded in pcibios_fixup_bus().
  ** We don't have a struct pci_bus assigned to us yet.
  */
  static void
  lba_pat_resources(struct parisc_device *pa_dev, struct lba_device *lba_dev)
  {
  	unsigned long bytecnt;
  	long io_count;
  	long status;	/* PDC return status */
  	long pa_count;
  	pdc_pat_cell_mod_maddr_block_t *pa_pdc_cell;	/* PA_VIEW */
  	pdc_pat_cell_mod_maddr_block_t *io_pdc_cell;	/* IO_VIEW */
  	int i;
  
  	pa_pdc_cell = kzalloc(sizeof(pdc_pat_cell_mod_maddr_block_t), GFP_KERNEL);
  	if (!pa_pdc_cell)
  		return;
  
  	io_pdc_cell = kzalloc(sizeof(pdc_pat_cell_mod_maddr_block_t), GFP_KERNEL);
  	if (!io_pdc_cell) {
  		kfree(pa_pdc_cell);
  		return;
  	}
  
  	/* return cell module (IO view) */
  	status = pdc_pat_cell_module(&bytecnt, pa_dev->pcell_loc, pa_dev->mod_index,
  				PA_VIEW, pa_pdc_cell);
  	pa_count = pa_pdc_cell->mod[1];
  
  	status |= pdc_pat_cell_module(&bytecnt, pa_dev->pcell_loc, pa_dev->mod_index,
  				IO_VIEW, io_pdc_cell);
  	io_count = io_pdc_cell->mod[1];
  
  	/* We've already done this once for device discovery...*/
  	if (status != PDC_OK) {
  		panic("pdc_pat_cell_module() call failed for LBA!
  ");
  	}
  
  	if (PAT_GET_ENTITY(pa_pdc_cell->mod_info) != PAT_ENTITY_LBA) {
  		panic("pdc_pat_cell_module() entity returned != PAT_ENTITY_LBA!
  ");
  	}
  
  	/*
  	** Inspect the resources PAT tells us about
  	*/
  	for (i = 0; i < pa_count; i++) {
  		struct {
  			unsigned long type;
  			unsigned long start;
  			unsigned long end;	/* aka finish */
  		} *p, *io;
  		struct resource *r;
  
  		p = (void *) &(pa_pdc_cell->mod[2+i*3]);
  		io = (void *) &(io_pdc_cell->mod[2+i*3]);
  
  		/* Convert the PAT range data to PCI "struct resource" */
  		switch(p->type & 0xff) {
  		case PAT_PBNUM:
  			lba_dev->hba.bus_num.start = p->start;
  			lba_dev->hba.bus_num.end   = p->end;
  			lba_dev->hba.bus_num.flags = IORESOURCE_BUS;
  			break;
  
  		case PAT_LMMIO:
  			/* used to fix up pre-initialized MEM BARs */
  			if (!lba_dev->hba.lmmio_space.flags) {
  				unsigned long lba_len;
  
  				lba_len = ~READ_REG32(lba_dev->hba.base_addr
  						+ LBA_LMMIO_MASK);
  				if ((p->end - p->start) != lba_len)
  					p->end = extend_lmmio_len(p->start,
  						p->end, lba_len);
  
  				sprintf(lba_dev->hba.lmmio_name,
  						"PCI%02x LMMIO",
  						(int)lba_dev->hba.bus_num.start);
  				lba_dev->hba.lmmio_space_offset = p->start -
  					io->start;
  				r = &lba_dev->hba.lmmio_space;
  				r->name = lba_dev->hba.lmmio_name;
  			} else if (!lba_dev->hba.elmmio_space.flags) {
  				sprintf(lba_dev->hba.elmmio_name,
  						"PCI%02x ELMMIO",
  						(int)lba_dev->hba.bus_num.start);
  				r = &lba_dev->hba.elmmio_space;
  				r->name = lba_dev->hba.elmmio_name;
  			} else {
  				printk(KERN_WARNING MODULE_NAME
  					" only supports 2 LMMIO resources!
  ");
  				break;
  			}
  
  			r->start  = p->start;
  			r->end    = p->end;
  			r->flags  = IORESOURCE_MEM;
  			r->parent = r->sibling = r->child = NULL;
  			break;
  
  		case PAT_GMMIO:
  			/* MMIO space > 4GB phys addr; for 64-bit BAR */
  			sprintf(lba_dev->hba.gmmio_name, "PCI%02x GMMIO",
  					(int)lba_dev->hba.bus_num.start);
  			r = &lba_dev->hba.gmmio_space;
  			r->name  = lba_dev->hba.gmmio_name;
  			r->start  = p->start;
  			r->end    = p->end;
  			r->flags  = IORESOURCE_MEM;
  			r->parent = r->sibling = r->child = NULL;
  			break;
  
  		case PAT_NPIOP:
  			printk(KERN_WARNING MODULE_NAME
  				" range[%d] : ignoring NPIOP (0x%lx)
  ",
  				i, p->start);
  			break;
  
  		case PAT_PIOP:
  			/*
  			** Postable I/O port space is per PCI host adapter.
  			** base of 64MB PIOP region
  			*/
  			lba_dev->iop_base = ioremap_nocache(p->start, 64 * 1024 * 1024);
  
  			sprintf(lba_dev->hba.io_name, "PCI%02x Ports",
  					(int)lba_dev->hba.bus_num.start);
  			r = &lba_dev->hba.io_space;
  			r->name  = lba_dev->hba.io_name;
  			r->start  = HBA_PORT_BASE(lba_dev->hba.hba_num);
  			r->end    = r->start + HBA_PORT_SPACE_SIZE - 1;
  			r->flags  = IORESOURCE_IO;
  			r->parent = r->sibling = r->child = NULL;
  			break;
  
  		default:
  			printk(KERN_WARNING MODULE_NAME
  				" range[%d] : unknown pat range type (0x%lx)
  ",
  				i, p->type & 0xff);
  			break;
  		}
  	}
  
  	kfree(pa_pdc_cell);
  	kfree(io_pdc_cell);
  }
  #else
  /* keep compiler from complaining about missing declarations */
  #define lba_pat_port_ops lba_astro_port_ops
  #define lba_pat_resources(pa_dev, lba_dev)
  #endif	/* CONFIG_64BIT */
  
  
  extern void sba_distributed_lmmio(struct parisc_device *, struct resource *);
  extern void sba_directed_lmmio(struct parisc_device *, struct resource *);
  
  
  static void
  lba_legacy_resources(struct parisc_device *pa_dev, struct lba_device *lba_dev)
  {
  	struct resource *r;
  	int lba_num;
  
  	lba_dev->hba.lmmio_space_offset = PCI_F_EXTEND;
  
  	/*
  	** With "legacy" firmware, the lowest byte of FW_SCRATCH
  	** represents bus->secondary and the second byte represents
  	** bus->subsidiary (i.e. highest PPB programmed by firmware).
  	** PCI bus walk *should* end up with the same result.
  	** FIXME: But we don't have sanity checks in PCI or LBA.
  	*/
  	lba_num = READ_REG32(lba_dev->hba.base_addr + LBA_FW_SCRATCH);
  	r = &(lba_dev->hba.bus_num);
  	r->name = "LBA PCI Busses";
  	r->start = lba_num & 0xff;
  	r->end = (lba_num>>8) & 0xff;
  	r->flags = IORESOURCE_BUS;
  
  	/* Set up local PCI Bus resources - we don't need them for
  	** Legacy boxes but it's nice to see in /proc/iomem.
  	*/
  	r = &(lba_dev->hba.lmmio_space);
  	sprintf(lba_dev->hba.lmmio_name, "PCI%02x LMMIO",
  					(int)lba_dev->hba.bus_num.start);
  	r->name  = lba_dev->hba.lmmio_name;
  
  #if 1
  	/* We want the CPU -> IO routing of addresses.
  	 * The SBA BASE/MASK registers control CPU -> IO routing.
  	 * Ask SBA what is routed to this rope/LBA.
  	 */
  	sba_distributed_lmmio(pa_dev, r);
  #else
  	/*
  	 * The LBA BASE/MASK registers control IO -> System routing.
  	 *
  	 * The following code works but doesn't get us what we want.
  	 * Well, only because firmware (v5.0) on C3000 doesn't program
  	 * the LBA BASE/MASE registers to be the exact inverse of 
  	 * the corresponding SBA registers. Other Astro/Pluto
  	 * based platform firmware may do it right.
  	 *
  	 * Should someone want to mess with MSI, they may need to
  	 * reprogram LBA BASE/MASK registers. Thus preserve the code
  	 * below until MSI is known to work on C3000/A500/N4000/RP3440.
  	 *
  	 * Using the code below, /proc/iomem shows:
  	 * ...
  	 * f0000000-f0ffffff : PCI00 LMMIO
  	 *   f05d0000-f05d0000 : lcd_data
  	 *   f05d0008-f05d0008 : lcd_cmd
  	 * f1000000-f1ffffff : PCI01 LMMIO
  	 * f4000000-f4ffffff : PCI02 LMMIO
  	 *   f4000000-f4001fff : sym53c8xx
  	 *   f4002000-f4003fff : sym53c8xx
  	 *   f4004000-f40043ff : sym53c8xx
  	 *   f4005000-f40053ff : sym53c8xx
  	 *   f4007000-f4007fff : ohci_hcd
  	 *   f4008000-f40083ff : tulip
  	 * f6000000-f6ffffff : PCI03 LMMIO
  	 * f8000000-fbffffff : PCI00 ELMMIO
  	 *   fa100000-fa4fffff : stifb mmio
  	 *   fb000000-fb1fffff : stifb fb
  	 *
  	 * But everything listed under PCI02 actually lives under PCI00.
  	 * This is clearly wrong.
  	 *
  	 * Asking SBA how things are routed tells the correct story:
  	 * LMMIO_BASE/MASK/ROUTE f4000001 fc000000 00000000
  	 * DIR0_BASE/MASK/ROUTE fa000001 fe000000 00000006
  	 * DIR1_BASE/MASK/ROUTE f9000001 ff000000 00000004
  	 * DIR2_BASE/MASK/ROUTE f0000000 fc000000 00000000
  	 * DIR3_BASE/MASK/ROUTE f0000000 fc000000 00000000
  	 *
  	 * Which looks like this in /proc/iomem:
  	 * f4000000-f47fffff : PCI00 LMMIO
  	 *   f4000000-f4001fff : sym53c8xx
  	 *   ...[deteled core devices - same as above]...
  	 *   f4008000-f40083ff : tulip
  	 * f4800000-f4ffffff : PCI01 LMMIO
  	 * f6000000-f67fffff : PCI02 LMMIO
  	 * f7000000-f77fffff : PCI03 LMMIO
  	 * f9000000-f9ffffff : PCI02 ELMMIO
  	 * fa000000-fbffffff : PCI03 ELMMIO
  	 *   fa100000-fa4fffff : stifb mmio
  	 *   fb000000-fb1fffff : stifb fb
  	 *
  	 * ie all Built-in core are under now correctly under PCI00.
  	 * The "PCI02 ELMMIO" directed range is for:
  	 *  +-[02]---03.0  3Dfx Interactive, Inc. Voodoo 2
  	 *
  	 * All is well now.
  	 */
  	r->start = READ_REG32(lba_dev->hba.base_addr + LBA_LMMIO_BASE);
  	if (r->start & 1) {
  		unsigned long rsize;
  
  		r->flags = IORESOURCE_MEM;
  		/* mmio_mask also clears Enable bit */
  		r->start &= mmio_mask;
  		r->start = PCI_HOST_ADDR(HBA_DATA(lba_dev), r->start);
  		rsize = ~ READ_REG32(lba_dev->hba.base_addr + LBA_LMMIO_MASK);
  
  		/*
  		** Each rope only gets part of the distributed range.
  		** Adjust "window" for this rope.
  		*/
  		rsize /= ROPES_PER_IOC;
  		r->start += (rsize + 1) * LBA_NUM(pa_dev->hpa.start);
  		r->end = r->start + rsize;
  	} else {
  		r->end = r->start = 0;	/* Not enabled. */
  	}
  #endif
  
  	/*
  	** "Directed" ranges are used when the "distributed range" isn't
  	** sufficient for all devices below a given LBA.  Typically devices
  	** like graphics cards or X25 may need a directed range when the
  	** bus has multiple slots (ie multiple devices) or the device
  	** needs more than the typical 4 or 8MB a distributed range offers.
  	**
  	** The main reason for ignoring it now frigging complications.
  	** Directed ranges may overlap (and have precedence) over
  	** distributed ranges. Or a distributed range assigned to a unused
  	** rope may be used by a directed range on a different rope.
  	** Support for graphics devices may require fixing this
  	** since they may be assigned a directed range which overlaps
  	** an existing (but unused portion of) distributed range.
  	*/
  	r = &(lba_dev->hba.elmmio_space);
  	sprintf(lba_dev->hba.elmmio_name, "PCI%02x ELMMIO",
  					(int)lba_dev->hba.bus_num.start);
  	r->name  = lba_dev->hba.elmmio_name;
  
  #if 1
  	/* See comment which precedes call to sba_directed_lmmio() */
  	sba_directed_lmmio(pa_dev, r);
  #else
  	r->start = READ_REG32(lba_dev->hba.base_addr + LBA_ELMMIO_BASE);
  
  	if (r->start & 1) {
  		unsigned long rsize;
  		r->flags = IORESOURCE_MEM;
  		/* mmio_mask also clears Enable bit */
  		r->start &= mmio_mask;
  		r->start = PCI_HOST_ADDR(HBA_DATA(lba_dev), r->start);
  		rsize = READ_REG32(lba_dev->hba.base_addr + LBA_ELMMIO_MASK);
  		r->end = r->start + ~rsize;
  	}
  #endif
  
  	r = &(lba_dev->hba.io_space);
  	sprintf(lba_dev->hba.io_name, "PCI%02x Ports",
  					(int)lba_dev->hba.bus_num.start);
  	r->name  = lba_dev->hba.io_name;
  	r->flags = IORESOURCE_IO;
  	r->start = READ_REG32(lba_dev->hba.base_addr + LBA_IOS_BASE) & ~1L;
  	r->end   = r->start + (READ_REG32(lba_dev->hba.base_addr + LBA_IOS_MASK) ^ (HBA_PORT_SPACE_SIZE - 1));
  
  	/* Virtualize the I/O Port space ranges */
  	lba_num = HBA_PORT_BASE(lba_dev->hba.hba_num);
  	r->start |= lba_num;
  	r->end   |= lba_num;
  }
  
  
  /**************************************************************************
  **
  **   LBA initialization code (HW and SW)
  **
  **   o identify LBA chip itself
  **   o initialize LBA chip modes (HardFail)
  **   o FIXME: initialize DMA hints for reasonable defaults
  **   o enable configuration functions
  **   o call pci_register_ops() to discover devs (fixup/fixup_bus get invoked)
  **
  **************************************************************************/
  
  static int __init
  lba_hw_init(struct lba_device *d)
  {
  	u32 stat;
  	u32 bus_reset;	/* PDC_PAT_BUG */
  
  #if 0
  	printk(KERN_DEBUG "LBA %lx  STAT_CTL %Lx  ERROR_CFG %Lx  STATUS %Lx DMA_CTL %Lx
  ",
  		d->hba.base_addr,
  		READ_REG64(d->hba.base_addr + LBA_STAT_CTL),
  		READ_REG64(d->hba.base_addr + LBA_ERROR_CONFIG),
  		READ_REG64(d->hba.base_addr + LBA_ERROR_STATUS),
  		READ_REG64(d->hba.base_addr + LBA_DMA_CTL) );
  	printk(KERN_DEBUG "	ARB mask %Lx  pri %Lx  mode %Lx  mtlt %Lx
  ",
  		READ_REG64(d->hba.base_addr + LBA_ARB_MASK),
  		READ_REG64(d->hba.base_addr + LBA_ARB_PRI),
  		READ_REG64(d->hba.base_addr + LBA_ARB_MODE),
  		READ_REG64(d->hba.base_addr + LBA_ARB_MTLT) );
  	printk(KERN_DEBUG "	HINT cfg 0x%Lx
  ",
  		READ_REG64(d->hba.base_addr + LBA_HINT_CFG));
  	printk(KERN_DEBUG "	HINT reg ");
  	{ int i;
  	for (i=LBA_HINT_BASE; i< (14*8 + LBA_HINT_BASE); i+=8)
  		printk(" %Lx", READ_REG64(d->hba.base_addr + i));
  	}
  	printk("
  ");
  #endif	/* DEBUG_LBA_PAT */
  
  #ifdef CONFIG_64BIT
  /*
   * FIXME add support for PDC_PAT_IO "Get slot status" - OLAR support
   * Only N-Class and up can really make use of Get slot status.
   * maybe L-class too but I've never played with it there.
   */
  #endif
  
  	/* PDC_PAT_BUG: exhibited in rev 40.48  on L2000 */
  	bus_reset = READ_REG32(d->hba.base_addr + LBA_STAT_CTL + 4) & 1;
  	if (bus_reset) {
  		printk(KERN_DEBUG "NOTICE: PCI bus reset still asserted! (clearing)
  ");
  	}
  
  	stat = READ_REG32(d->hba.base_addr + LBA_ERROR_CONFIG);
  	if (stat & LBA_SMART_MODE) {
  		printk(KERN_DEBUG "NOTICE: LBA in SMART mode! (cleared)
  ");
  		stat &= ~LBA_SMART_MODE;
  		WRITE_REG32(stat, d->hba.base_addr + LBA_ERROR_CONFIG);
  	}
  
  	/* Set HF mode as the default (vs. -1 mode). */
          stat = READ_REG32(d->hba.base_addr + LBA_STAT_CTL);
  	WRITE_REG32(stat | HF_ENABLE, d->hba.base_addr + LBA_STAT_CTL);
  
  	/*
  	** Writing a zero to STAT_CTL.rf (bit 0) will clear reset signal
  	** if it's not already set. If we just cleared the PCI Bus Reset
  	** signal, wait a bit for the PCI devices to recover and setup.
  	*/
  	if (bus_reset)
  		mdelay(pci_post_reset_delay);
  
  	if (0 == READ_REG32(d->hba.base_addr + LBA_ARB_MASK)) {
  		/*
  		** PDC_PAT_BUG: PDC rev 40.48 on L2000.
  		** B2000/C3600/J6000 also have this problem?
  		** 
  		** Elroys with hot pluggable slots don't get configured
  		** correctly if the slot is empty.  ARB_MASK is set to 0
  		** and we can't master transactions on the bus if it's
  		** not at least one. 0x3 enables elroy and first slot.
  		*/
  		printk(KERN_DEBUG "NOTICE: Enabling PCI Arbitration
  ");
  		WRITE_REG32(0x3, d->hba.base_addr + LBA_ARB_MASK);
  	}
  
  	/*
  	** FIXME: Hint registers are programmed with default hint
  	** values by firmware. Hints should be sane even if we
  	** can't reprogram them the way drivers want.
  	*/
  	return 0;
  }
  
  /*
   * Unfortunately, when firmware numbers busses, it doesn't take into account
   * Cardbus bridges.  So we have to renumber the busses to suit ourselves.
   * Elroy/Mercury don't actually know what bus number they're attached to;
   * we use bus 0 to indicate the directly attached bus and any other bus
   * number will be taken care of by the PCI-PCI bridge.
   */
  static unsigned int lba_next_bus = 0;
  
  /*
   * Determine if lba 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 __init
  lba_driver_probe(struct parisc_device *dev)
  {
  	struct lba_device *lba_dev;
  	LIST_HEAD(resources);
  	struct pci_bus *lba_bus;
  	struct pci_ops *cfg_ops;
  	u32 func_class;
  	void *tmp_obj;
  	char *version;
  	void __iomem *addr = ioremap_nocache(dev->hpa.start, 4096);
  	int max;
  
  	/* Read HW Rev First */
  	func_class = READ_REG32(addr + LBA_FCLASS);
  
  	if (IS_ELROY(dev)) {	
  		func_class &= 0xf;
  		switch (func_class) {
  		case 0:	version = "TR1.0"; break;
  		case 1:	version = "TR2.0"; break;
  		case 2:	version = "TR2.1"; break;
  		case 3:	version = "TR2.2"; break;
  		case 4:	version = "TR3.0"; break;
  		case 5:	version = "TR4.0"; break;
  		default: version = "TR4+";
  		}
  
  		printk(KERN_INFO "Elroy version %s (0x%x) found at 0x%lx
  ",
  		       version, func_class & 0xf, (long)dev->hpa.start);
  
  		if (func_class < 2) {
  			printk(KERN_WARNING "Can't support LBA older than "
  				"TR2.1 - continuing under adversity.
  ");
  		}
  
  #if 0
  /* Elroy TR4.0 should work with simple algorithm.
     But it doesn't.  Still missing something. *sigh*
  */
  		if (func_class > 4) {
  			cfg_ops = &mercury_cfg_ops;
  		} else
  #endif
  		{
  			cfg_ops = &elroy_cfg_ops;
  		}
  
  	} else if (IS_MERCURY(dev) || IS_QUICKSILVER(dev)) {
  		int major, minor;
  
  		func_class &= 0xff;
  		major = func_class >> 4, minor = func_class & 0xf;
  
  		/* We could use one printk for both Elroy and Mercury,
                   * but for the mask for func_class.
                   */ 
  		printk(KERN_INFO "%s version TR%d.%d (0x%x) found at 0x%lx
  ",
  		       IS_MERCURY(dev) ? "Mercury" : "Quicksilver", major,
  		       minor, func_class, (long)dev->hpa.start);
  
  		cfg_ops = &mercury_cfg_ops;
  	} else {
  		printk(KERN_ERR "Unknown LBA found at 0x%lx
  ",
  			(long)dev->hpa.start);
  		return -ENODEV;
  	}
  
  	/* Tell I/O SAPIC driver we have a IRQ handler/region. */
  	tmp_obj = iosapic_register(dev->hpa.start + LBA_IOSAPIC_BASE);
  
  	/* NOTE: PCI devices (e.g. 103c:1005 graphics card) which don't
  	**	have an IRT entry will get NULL back from iosapic code.
  	*/
  	
  	lba_dev = kzalloc(sizeof(struct lba_device), GFP_KERNEL);
  	if (!lba_dev) {
  		printk(KERN_ERR "lba_init_chip - couldn't alloc lba_device
  ");
  		return(1);
  	}
  
  
  	/* ---------- First : initialize data we already have --------- */
  
  	lba_dev->hw_rev = func_class;
  	lba_dev->hba.base_addr = addr;
  	lba_dev->hba.dev = dev;
  	lba_dev->iosapic_obj = tmp_obj;  /* save interrupt handle */
  	lba_dev->hba.iommu = sba_get_iommu(dev);  /* get iommu data */
  	parisc_set_drvdata(dev, lba_dev);
  
  	/* ------------ Second : initialize common stuff ---------- */
  	pci_bios = &lba_bios_ops;
  	pcibios_register_hba(HBA_DATA(lba_dev));
  	spin_lock_init(&lba_dev->lba_lock);
  
  	if (lba_hw_init(lba_dev))
  		return(1);
  
  	/* ---------- Third : setup I/O Port and MMIO resources  --------- */
  
  	if (is_pdc_pat()) {
  		/* PDC PAT firmware uses PIOP region of GMMIO space. */
  		pci_port = &lba_pat_port_ops;
  		/* Go ask PDC PAT what resources this LBA has */
  		lba_pat_resources(dev, lba_dev);
  	} else {
  		if (!astro_iop_base) {
  			/* Sprockets PDC uses NPIOP region */
  			astro_iop_base = ioremap_nocache(LBA_PORT_BASE, 64 * 1024);
  			pci_port = &lba_astro_port_ops;
  		}
  
  		/* Poke the chip a bit for /proc output */
  		lba_legacy_resources(dev, lba_dev);
  	}
  
  	if (lba_dev->hba.bus_num.start < lba_next_bus)
  		lba_dev->hba.bus_num.start = lba_next_bus;
  
  	/*   Overlaps with elmmio can (and should) fail here.
  	 *   We will prune (or ignore) the distributed range.
  	 *
  	 *   FIXME: SBA code should register all elmmio ranges first.
  	 *      that would take care of elmmio ranges routed
  	 *	to a different rope (already discovered) from
  	 *	getting registered *after* LBA code has already
  	 *	registered it's distributed lmmio range.
  	 */
  	if (truncate_pat_collision(&iomem_resource,
  				   &(lba_dev->hba.lmmio_space))) {
  		printk(KERN_WARNING "LBA: lmmio_space [%lx/%lx] duplicate!
  ",
  				(long)lba_dev->hba.lmmio_space.start,
  				(long)lba_dev->hba.lmmio_space.end);
  		lba_dev->hba.lmmio_space.flags = 0;
  	}
  
  	pci_add_resource_offset(&resources, &lba_dev->hba.io_space,
  				HBA_PORT_BASE(lba_dev->hba.hba_num));
  	if (lba_dev->hba.elmmio_space.flags)
  		pci_add_resource_offset(&resources, &lba_dev->hba.elmmio_space,
  					lba_dev->hba.lmmio_space_offset);
  	if (lba_dev->hba.lmmio_space.flags)
  		pci_add_resource_offset(&resources, &lba_dev->hba.lmmio_space,
  					lba_dev->hba.lmmio_space_offset);
  	if (lba_dev->hba.gmmio_space.flags)
  		pci_add_resource(&resources, &lba_dev->hba.gmmio_space);
  
  	pci_add_resource(&resources, &lba_dev->hba.bus_num);
  
  	dev->dev.platform_data = lba_dev;
  	lba_bus = lba_dev->hba.hba_bus =
  		pci_create_root_bus(&dev->dev, lba_dev->hba.bus_num.start,
  				    cfg_ops, NULL, &resources);
  	if (!lba_bus) {
  		pci_free_resource_list(&resources);
  		return 0;
  	}
  
  	max = pci_scan_child_bus(lba_bus);
  
  	/* This is in lieu of calling pci_assign_unassigned_resources() */
  	if (is_pdc_pat()) {
  		/* assign resources to un-initialized devices */
  
  		DBG_PAT("LBA pci_bus_size_bridges()
  ");
  		pci_bus_size_bridges(lba_bus);
  
  		DBG_PAT("LBA pci_bus_assign_resources()
  ");
  		pci_bus_assign_resources(lba_bus);
  
  #ifdef DEBUG_LBA_PAT
  		DBG_PAT("
  LBA PIOP resource tree
  ");
  		lba_dump_res(&lba_dev->hba.io_space, 2);
  		DBG_PAT("
  LBA LMMIO resource tree
  ");
  		lba_dump_res(&lba_dev->hba.lmmio_space, 2);
  #endif
  	}
  
  	/*
  	** Once PCI register ops has walked the bus, access to config
  	** space is restricted. Avoids master aborts on config cycles.
  	** Early LBA revs go fatal on *any* master abort.
  	*/
  	if (cfg_ops == &elroy_cfg_ops) {
  		lba_dev->flags |= LBA_FLAG_SKIP_PROBE;
  	}
  
  	lba_next_bus = max + 1;
  	pci_bus_add_devices(lba_bus);
  
  	/* Whew! Finally done! Tell services we got this one covered. */
  	return 0;
  }
  
  static struct parisc_device_id lba_tbl[] = {
  	{ HPHW_BRIDGE, HVERSION_REV_ANY_ID, ELROY_HVERS, 0xa },
  	{ HPHW_BRIDGE, HVERSION_REV_ANY_ID, MERCURY_HVERS, 0xa },
  	{ HPHW_BRIDGE, HVERSION_REV_ANY_ID, QUICKSILVER_HVERS, 0xa },
  	{ 0, }
  };
  
  static struct parisc_driver lba_driver = {
  	.name =		MODULE_NAME,
  	.id_table =	lba_tbl,
  	.probe =	lba_driver_probe,
  };
  
  /*
  ** One time initialization to let the world know the LBA was found.
  ** Must be called exactly once before pci_init().
  */
  void __init lba_init(void)
  {
  	register_parisc_driver(&lba_driver);
  }
  
  /*
  ** Initialize the IBASE/IMASK registers for LBA (Elroy).
  ** Only called from sba_iommu.c in order to route ranges (MMIO vs DMA).
  ** sba_iommu is responsible for locking (none needed at init time).
  */
  void lba_set_iregs(struct parisc_device *lba, u32 ibase, u32 imask)
  {
  	void __iomem * base_addr = ioremap_nocache(lba->hpa.start, 4096);
  
  	imask <<= 2;	/* adjust for hints - 2 more bits */
  
  	/* Make sure we aren't trying to set bits that aren't writeable. */
  	WARN_ON((ibase & 0x001fffff) != 0);
  	WARN_ON((imask & 0x001fffff) != 0);
  	
  	DBG("%s() ibase 0x%x imask 0x%x
  ", __func__, ibase, imask);
  	WRITE_REG32( imask, base_addr + LBA_IMASK);
  	WRITE_REG32( ibase, base_addr + LBA_IBASE);
  	iounmap(base_addr);
  }