Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1649 insertions, 0 deletions

diff --git a/drivers/parisc/lba_pci.c b/drivers/parisc/lba_pci.c
new file mode 100644
index 000000000000..dc838804c0dd
--- /dev/null
+++ b/drivers/parisc/lba_pci.c
@@ -0,0 +1,1649 @@
+/*
+**
+**  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 and __devinit */
+#include <linux/pci.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/smp_lock.h>
+
+#include <asm/byteorder.h>
+#include <asm/pdc.h>
+#include <asm/pdcpat.h>
+#include <asm/page.h>
+#include <asm/system.h>
+
+#include <asm/hardware.h>	/* for register_parisc_driver() stuff */
+#include <asm/parisc-device.h>
+#include <asm/iosapic.h>	/* for iosapic_register() */
+#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"
+
+#define LBA_FUNC_ID	0x0000	/* function id */
+#define LBA_FCLASS	0x0008	/* function class, bist, header, rev... */
+#define LBA_CAPABLE	0x0030	/* capabilities register */
+
+#define LBA_PCI_CFG_ADDR	0x0040	/* poke CFG address here */
+#define LBA_PCI_CFG_DATA	0x0048	/* read or write data here */
+
+#define LBA_PMC_MTLT	0x0050	/* Firmware sets this - read only. */
+#define LBA_FW_SCRATCH	0x0058	/* Firmware writes the PCI bus number here. */
+#define LBA_ERROR_ADDR	0x0070	/* On error, address gets logged here */
+
+#define LBA_ARB_MASK	0x0080	/* bit 0 enable arbitration. PAT/PDC enables */
+#define LBA_ARB_PRI	0x0088	/* firmware sets this. */
+#define LBA_ARB_MODE	0x0090	/* firmware sets this. */
+#define LBA_ARB_MTLT	0x0098	/* firmware sets this. */
+
+#define LBA_MOD_ID	0x0100	/* Module ID. PDC_PAT_CELL reports 4 */
+
+#define LBA_STAT_CTL	0x0108	/* Status & Control */
+#define   LBA_BUS_RESET		0x01	/*  Deassert PCI Bus Reset Signal */
+#define   CLEAR_ERRLOG		0x10	/*  "Clear Error Log" cmd */
+#define   CLEAR_ERRLOG_ENABLE	0x20	/*  "Clear Error Log" Enable */
+#define   HF_ENABLE	0x40	/*    enable HF mode (default is -1 mode) */
+
+#define LBA_LMMIO_BASE	0x0200	/* < 4GB I/O address range */
+#define LBA_LMMIO_MASK	0x0208
+
+#define LBA_GMMIO_BASE	0x0210	/* > 4GB I/O address range */
+#define LBA_GMMIO_MASK	0x0218
+
+#define LBA_WLMMIO_BASE	0x0220	/* All < 4GB ranges under the same *SBA* */
+#define LBA_WLMMIO_MASK	0x0228
+
+#define LBA_WGMMIO_BASE	0x0230	/* All > 4GB ranges under the same *SBA* */
+#define LBA_WGMMIO_MASK	0x0238
+
+#define LBA_IOS_BASE	0x0240	/* I/O port space for this LBA */
+#define LBA_IOS_MASK	0x0248
+
+#define LBA_ELMMIO_BASE	0x0250	/* Extra LMMIO range */
+#define LBA_ELMMIO_MASK	0x0258
+
+#define LBA_EIOS_BASE	0x0260	/* Extra I/O port space */
+#define LBA_EIOS_MASK	0x0268
+
+#define LBA_GLOBAL_MASK	0x0270	/* Mercury only: Global Address Mask */
+#define LBA_DMA_CTL	0x0278	/* firmware sets this */
+
+#define LBA_IBASE	0x0300	/* SBA DMA support */
+#define LBA_IMASK	0x0308
+
+/* FIXME: ignore DMA Hint stuff until we can measure performance */
+#define LBA_HINT_CFG	0x0310
+#define LBA_HINT_BASE	0x0380	/* 14 registers at every 8 bytes. */
+
+#define LBA_BUS_MODE	0x0620
+
+/* ERROR regs are needed for config cycle kluges */
+#define LBA_ERROR_CONFIG 0x0680
+#define     LBA_SMART_MODE 0x20
+#define LBA_ERROR_STATUS 0x0688
+#define LBA_ROPE_CTL     0x06A0
+
+#define LBA_IOSAPIC_BASE	0x800 /* Offset of IRQ logic */
+
+/* non-postable I/O port space, densely packed */
+#define LBA_PORT_BASE	(PCI_F_EXTEND | 0xfee00000UL)
+static void __iomem *astro_iop_base;
+
+#define ELROY_HVERS	0x782
+#define MERCURY_HVERS	0x783
+#define QUICKSILVER_HVERS	0x784
+
+static inline int IS_ELROY(struct parisc_device *d)
+{
+	return (d->id.hversion == ELROY_HVERS);
+}
+
+static inline int IS_MERCURY(struct parisc_device *d)
+{
+	return (d->id.hversion == MERCURY_HVERS);
+}
+
+static inline int IS_QUICKSILVER(struct parisc_device *d)
+{
+	return (d->id.hversion == QUICKSILVER_HVERS);
+}
+
+
+/*
+** lba_device: Per instance Elroy data structure
+*/
+struct lba_device {
+	struct pci_hba_data hba;
+
+	spinlock_t	lba_lock;
+	void		*iosapic_obj;
+
+#ifdef CONFIG_64BIT
+	void __iomem *	iop_base;    /* PA_VIEW - for IO port accessor funcs */
+#endif
+
+	int		flags;       /* state/functionality enabled */
+	int		hw_rev;      /* HW revision of chip */
+};
+
+
+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\n", r, r->start, 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->secondary;
+	u8 last_sub_bus = d->hba.hba_bus->subordinate;
+
+	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->secondary;
+	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)\n", __FUNCTION__, tok, pos, *data);
+		return 0;
+	}
+
+	if (LBA_SKIP_PROBE(d) && !lba_device_present(bus->secondary, devfn, d)) {
+		DBG_CFG("%s(%x+%2x) -> -1 (b)\n", __FUNCTION__, 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)\n", __FUNCTION__, 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->secondary;
+	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)\n", __FUNCTION__, tok, pos,data);
+		return 0;
+	}
+
+	if (LBA_SKIP_PROBE(d) && (!lba_device_present(bus->secondary, devfn, d))) {
+		DBG_CFG("%s(%x+%2x) = 0x%x (b)\n", __FUNCTION__, tok, pos,data);
+		return 1; /* New Workaround */
+	}
+
+	DBG_CFG("%s(%x+%2x) = 0x%x (c)\n", __FUNCTION__, 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->secondary;
+	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\n", 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->secondary;
+	u32 tok = LBA_CFG_TOK(local_bus,devfn);
+
+	if ((pos > 255) || (devfn > 255))
+		return -EINVAL;
+
+	DBG_CFG("%s(%x+%2x) <- 0x%x (c)\n", __FUNCTION__, 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\n");
+}
+
+
+#ifdef CONFIG_64BIT
+
+/*
+** Determine if a device is already configured.
+** If so, reserve it resources.
+**
+** Read PCI cfg command register and see if I/O or MMIO is enabled.
+** PAT has to enable the devices it's using.
+**
+** Note: resources are fixed up before we try to claim them.
+*/
+static void
+lba_claim_dev_resources(struct pci_dev *dev)
+{
+	u16 cmd;
+	int i, srch_flags;
+
+	(void) pci_read_config_word(dev, PCI_COMMAND, &cmd);
+
+	srch_flags  = (cmd & PCI_COMMAND_IO) ? IORESOURCE_IO : 0;
+	if (cmd & PCI_COMMAND_MEMORY)
+		srch_flags |= IORESOURCE_MEM;
+
+	if (!srch_flags)
+		return;
+
+	for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
+		if (dev->resource[i].flags & srch_flags) {
+			pci_claim_resource(dev, i);
+			DBG("   claimed %s %d [%lx,%lx]/%lx\n",
+				pci_name(dev), i,
+				dev->resource[i].start,
+				dev->resource[i].end,
+				dev->resource[i].flags
+				);
+		}
+	}
+}
+#else
+#define lba_claim_dev_resources(dev)
+#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 list_head *ln;
+#ifdef FBB_SUPPORT
+	u16 status;
+#endif
+	struct lba_device *ldev = LBA_DEV(parisc_walk_tree(bus->bridge));
+	int lba_portbase = HBA_PORT_BASE(ldev->hba.hba_num);
+
+	DBG("lba_fixup_bus(0x%p) bus %d platform_data 0x%p\n",
+		bus, bus->secondary, bus->bridge->platform_data);
+
+	/*
+	** Properly Setup MMIO resources for this bus.
+	** pci_alloc_primary_bus() mangles this.
+	*/
+	if (bus->self) {
+		/* PCI-PCI Bridge */
+		pci_read_bridge_bases(bus);
+	} else {
+		/* Host-PCI Bridge */
+		int err, i;
+
+		DBG("lba_fixup_bus() %s [%lx/%lx]/%lx\n",
+			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\n",
+			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.start) {
+			err = request_resource(&iomem_resource,
+					&(ldev->hba.elmmio_space));
+			if (err < 0) {
+
+				printk("FAILED: lba_fixup_bus() request for "
+						"elmmio_space [%lx/%lx]\n",
+						ldev->hba.elmmio_space.start,
+						ldev->hba.elmmio_space.end);
+
+				/* lba_dump_res(&iomem_resource, 2); */
+				/* BUG(); */
+			}
+		}
+
+		err = request_resource(&iomem_resource, &(ldev->hba.lmmio_space));
+		if (err < 0) {
+			/*   FIXME  overlaps with elmmio will fail here.
+			 *   Need to prune (or disable) the distributed range.
+			 *
+			 *   BEWARE: conflicts with this lmmio range may be
+			 *   elmmio range which is pointing down another rope.
+			 */
+
+			printk("FAILED: lba_fixup_bus() request for "
+					"lmmio_space [%lx/%lx]\n",
+					ldev->hba.lmmio_space.start,
+					ldev->hba.lmmio_space.end);
+			/* lba_dump_res(&iomem_resource, 2); */
+		}
+
+#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]\n",
+					ldev->hba.gmmio_space.start,
+					ldev->hba.gmmio_space.end);
+				lba_dump_res(&iomem_resource, 2);
+				BUG();
+			}
+		}
+#endif
+
+		/* advertize Host bridge resources to PCI bus */
+		bus->resource[0] = &(ldev->hba.io_space);
+		bus->resource[1] = &(ldev->hba.lmmio_space);
+		i=2;
+		if (ldev->hba.elmmio_space.start)
+			bus->resource[i++] = &(ldev->hba.elmmio_space);
+		if (ldev->hba.gmmio_space.start)
+			bus->resource[i++] = &(ldev->hba.gmmio_space);
+			
+	}
+
+	list_for_each(ln, &bus->devices) {
+		int i;
+		struct pci_dev *dev = pci_dev_b(ln);
+
+		DBG("lba_fixup_bus() %s\n", 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;
+
+			if (res->flags & IORESOURCE_IO) {
+				DBG("lba_fixup_bus() I/O Ports [%lx/%lx] -> ",
+					res->start, res->end);
+				res->start |= lba_portbase;
+				res->end   |= lba_portbase;
+				DBG("[%lx/%lx]\n", res->start, res->end);
+			} else if (res->flags & IORESOURCE_MEM) {
+				/*
+				** Convert PCI (IO_VIEW) addresses to
+				** processor (PA_VIEW) addresses
+				 */
+				DBG("lba_fixup_bus() MMIO [%lx/%lx] -> ",
+					res->start, res->end);
+				res->start = PCI_HOST_ADDR(HBA_DATA(ldev), res->start);
+				res->end   = PCI_HOST_ADDR(HBA_DATA(ldev), res->end);
+				DBG("[%lx/%lx]\n", res->start, res->end);
+			} else {
+				DBG("lba_fixup_bus() WTF? 0x%lx [%lx/%lx] XXX",
+					res->flags, res->start, res->end);
+			}
+		}
+
+#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
+
+		if (is_pdc_pat()) {
+			/* Claim resources for PDC's devices */
+			lba_claim_dev_resources(dev);
+		}
+
+                /*
+		** 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->self) {
+			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(ln, &bus->devices) {
+		(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
+}
+
+
+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\n", 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)\n", __FUNCTION__, 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) ->", __FUNCTION__, l, addr); \
+	t = READ_REG##size(PIOP_TO_GMMIO(LBA_DEV(l), addr)); \
+	DBG_PORT(" 0x%x\n", 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 *where = (void *) PIOP_TO_GMMIO(LBA_DEV(l), addr); \
+	DBG_PORT("%s(0x%p, 0x%x, 0x%x)\n", __FUNCTION__, 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;
+	pdc_pat_cell_mod_maddr_block_t pa_pdc_cell;	/* PA_VIEW */
+	pdc_pat_cell_mod_maddr_block_t io_pdc_cell;	/* IO_VIEW */
+	long io_count;
+	long status;	/* PDC return status */
+	long pa_count;
+	int i;
+
+	/* 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!\n");
+	}
+
+	if (PAT_GET_ENTITY(pa_pdc_cell.mod_info) != PAT_ENTITY_LBA) {
+		panic("pdc_pat_cell_module() entity returned != PAT_ENTITY_LBA!\n");
+	}
+
+	/*
+	** 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;
+			break;
+
+		case PAT_LMMIO:
+			/* used to fix up pre-initialized MEM BARs */
+			if (!lba_dev->hba.lmmio_space.start) {
+				sprintf(lba_dev->hba.lmmio_name,
+						"PCI%02lx LMMIO",
+						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.start) {
+				sprintf(lba_dev->hba.elmmio_name,
+						"PCI%02lx ELMMIO",
+						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!\n");
+				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%02lx GMMIO",
+					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)\n",
+				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(p->start, 64 * 1024 * 1024);
+
+			sprintf(lba_dev->hba.io_name, "PCI%02lx Ports",
+					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)\n",
+				i, p->type & 0xff);
+			break;
+		}
+	}
+}
+#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;
+
+	/* 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%02lx LMMIO",
+					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);
+		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%02lx ELMMIO",
+					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%02lx Ports",
+					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\n",
+		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\n",
+		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\n",
+		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("\n");
+#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)\n");
+	}
+
+	stat = READ_REG32(d->hba.base_addr + LBA_ERROR_CONFIG);
+	if (stat & LBA_SMART_MODE) {
+		printk(KERN_DEBUG "NOTICE: LBA in SMART mode! (cleared)\n");
+		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\n");
+		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;
+}
+
+
+
+/*
+** 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;
+	struct pci_bus *lba_bus;
+	struct pci_ops *cfg_ops;
+	u32 func_class;
+	void *tmp_obj;
+	char *version;
+	void __iomem *addr = ioremap(dev->hpa, 4096);
+
+	/* 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 "%s version %s (0x%x) found at 0x%lx\n",
+			MODULE_NAME, version, func_class & 0xf, dev->hpa);
+
+		if (func_class < 2) {
+			printk(KERN_WARNING "Can't support LBA older than "
+				"TR2.1 - continuing under adversity.\n");
+		}
+
+#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)) {
+		func_class &= 0xff;
+		version = kmalloc(6, GFP_KERNEL);
+		sprintf(version,"TR%d.%d",(func_class >> 4),(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 %s (0x%x) found at 0x%lx\n",
+			MODULE_NAME, version, func_class & 0xff, dev->hpa);
+		cfg_ops = &mercury_cfg_ops;
+	} else {
+		printk(KERN_ERR "Unknown LBA found at 0x%lx\n", dev->hpa);
+		return -ENODEV;
+	}
+
+	/*
+	** Tell I/O SAPIC driver we have a IRQ handler/region.
+	*/
+	tmp_obj = iosapic_register(dev->hpa + 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 = kmalloc(sizeof(struct lba_device), GFP_KERNEL);
+	if (!lba_dev) {
+		printk(KERN_ERR "lba_init_chip - couldn't alloc lba_device\n");
+		return(1);
+	}
+
+	memset(lba_dev, 0, sizeof(struct lba_device));
+
+
+	/* ---------- 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 */
+
+	/* ------------ 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(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);
+	}
+
+	/* 
+	** Tell PCI support another PCI bus was found.
+	** Walks PCI bus for us too.
+	*/
+	dev->dev.platform_data = lba_dev;
+	lba_bus = lba_dev->hba.hba_bus =
+		pci_scan_bus_parented(&dev->dev, lba_dev->hba.bus_num.start,
+				cfg_ops, NULL);
+
+	/* 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()\n");
+		pci_bus_size_bridges(lba_bus);
+
+		DBG_PAT("LBA pci_bus_assign_resources()\n");
+		pci_bus_assign_resources(lba_bus);
+
+#ifdef DEBUG_LBA_PAT
+		DBG_PAT("\nLBA PIOP resource tree\n");
+		lba_dump_res(&lba_dev->hba.io_space, 2);
+		DBG_PAT("\nLBA LMMIO resource tree\n");
+		lba_dump_res(&lba_dev->hba.lmmio_space, 2);
+#endif
+	}
+	pci_enable_bridges(lba_bus);
+
+
+	/*
+	** 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;
+	}
+
+	/* 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(lba->hpa, 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\n", __FUNCTION__, ibase, imask);
+	WRITE_REG32( imask, base_addr + LBA_IMASK);
+	WRITE_REG32( ibase, base_addr + LBA_IBASE);
+	iounmap(base_addr);
+}
+