arch/powerpc/platforms/maple/pci.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org),
  *		      IBM Corp.
  *
  * 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.
  */

 #undef DEBUG

 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/delay.h>
 #include <linux/string.h>
 #include <linux/init.h>
 #include <linux/bootmem.h>
 #include <linux/irq.h>

 #include <asm/sections.h>
 #include <asm/io.h>
 #include <asm/prom.h>
 #include <asm/pci-bridge.h>
 #include <asm/machdep.h>
 #include <asm/iommu.h>
 #include <asm/ppc-pci.h>

 #include "maple.h"

 #ifdef DEBUG
 #define DBG(x...) printk(x)
 #else
 #define DBG(x...)
 #endif

 static struct pci_controller *u3_agp, *u3_ht, *u4_pcie;

 static int __init fixup_one_level_bus_range(struct device_node *node, int higher)
 {
 	for (; node != 0;node = node->sibling) {
 		const int *bus_range;
 		const unsigned int *class_code;
 		int len;

 		/* For PCI<->PCI bridges or CardBus bridges, we go down */
 		class_code = of_get_property(node, "class-code", NULL);
 		if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
 			(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
 			continue;
 		bus_range = of_get_property(node, "bus-range", &len);
 		if (bus_range != NULL && len > 2 * sizeof(int)) {
 			if (bus_range[1] > higher)
 				higher = bus_range[1];
 		}
 		higher = fixup_one_level_bus_range(node->child, higher);
 	}
 	return higher;
 }

 /* This routine fixes the "bus-range" property of all bridges in the
  * system since they tend to have their "last" member wrong on macs
  *
  * Note that the bus numbers manipulated here are OF bus numbers, they
  * are not Linux bus numbers.
  */
 static void __init fixup_bus_range(struct device_node *bridge)
 {
 	int *bus_range;
 	struct property *prop;
 	int len;

 	/* Lookup the "bus-range" property for the hose */
 	prop = of_find_property(bridge, "bus-range", &len);
 	if (prop == NULL  || prop->value == NULL || len < 2 * sizeof(int)) {
 		printk(KERN_WARNING "Can't get bus-range for %s\n",
 			       bridge->full_name);
 		return;
 	}
 	bus_range = prop->value;
 	bus_range[1] = fixup_one_level_bus_range(bridge->child, bus_range[1]);
 }


 static unsigned long u3_agp_cfa0(u8 devfn, u8 off)
 {
 	return (1 << (unsigned long)PCI_SLOT(devfn)) |
 		((unsigned long)PCI_FUNC(devfn) << 8) |
 		((unsigned long)off & 0xFCUL);
 }

 static unsigned long u3_agp_cfa1(u8 bus, u8 devfn, u8 off)
 {
 	return ((unsigned long)bus << 16) |
 		((unsigned long)devfn << 8) |
 		((unsigned long)off & 0xFCUL) |
 		1UL;
 }

 static volatile void __iomem *u3_agp_cfg_access(struct pci_controller* hose,
 				       u8 bus, u8 dev_fn, u8 offset)
 {
 	unsigned int caddr;

 	if (bus == hose->first_busno) {
 		if (dev_fn < (11 << 3))
 			return NULL;
 		caddr = u3_agp_cfa0(dev_fn, offset);
 	} else
 		caddr = u3_agp_cfa1(bus, dev_fn, offset);

 	/* Uninorth will return garbage if we don't read back the value ! */
 	do {
 		out_le32(hose->cfg_addr, caddr);
 	} while (in_le32(hose->cfg_addr) != caddr);

 	offset &= 0x07;
 	return hose->cfg_data + offset;
 }

 static int u3_agp_read_config(struct pci_bus *bus, unsigned int devfn,
 			      int offset, int len, u32 *val)
 {
 	struct pci_controller *hose;
 	volatile void __iomem *addr;

 	hose = pci_bus_to_host(bus);
 	if (hose == NULL)
 		return PCIBIOS_DEVICE_NOT_FOUND;

 	addr = u3_agp_cfg_access(hose, bus->number, devfn, offset);
 	if (!addr)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	/*
 	 * Note: the caller has already checked that offset is
 	 * suitably aligned and that len is 1, 2 or 4.
 	 */
 	switch (len) {
 	case 1:
 		*val = in_8(addr);
 		break;
 	case 2:
 		*val = in_le16(addr);
 		break;
 	default:
 		*val = in_le32(addr);
 		break;
 	}
 	return PCIBIOS_SUCCESSFUL;
 }

 static int u3_agp_write_config(struct pci_bus *bus, unsigned int devfn,
 			       int offset, int len, u32 val)
 {
 	struct pci_controller *hose;
 	volatile void __iomem *addr;

 	hose = pci_bus_to_host(bus);
 	if (hose == NULL)
 		return PCIBIOS_DEVICE_NOT_FOUND;

 	addr = u3_agp_cfg_access(hose, bus->number, devfn, offset);
 	if (!addr)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	/*
 	 * Note: the caller has already checked that offset is
 	 * suitably aligned and that len is 1, 2 or 4.
 	 */
 	switch (len) {
 	case 1:
 		out_8(addr, val);
 		break;
 	case 2:
 		out_le16(addr, val);
 		break;
 	default:
 		out_le32(addr, val);
 		break;
 	}
 	return PCIBIOS_SUCCESSFUL;
 }

 static struct pci_ops u3_agp_pci_ops =
 {
 	.read = u3_agp_read_config,
 	.write = u3_agp_write_config,
 };

 static unsigned long u3_ht_cfa0(u8 devfn, u8 off)
 {
 	return (devfn << 8) | off;
 }

 static unsigned long u3_ht_cfa1(u8 bus, u8 devfn, u8 off)
 {
 	return u3_ht_cfa0(devfn, off) + (bus << 16) + 0x01000000UL;
 }

 static volatile void __iomem *u3_ht_cfg_access(struct pci_controller* hose,
 				      u8 bus, u8 devfn, u8 offset)
 {
 	if (bus == hose->first_busno) {
 		if (PCI_SLOT(devfn) == 0)
 			return NULL;
 		return hose->cfg_data + u3_ht_cfa0(devfn, offset);
 	} else
 		return hose->cfg_data + u3_ht_cfa1(bus, devfn, offset);
 }

 static int u3_ht_read_config(struct pci_bus *bus, unsigned int devfn,
 			     int offset, int len, u32 *val)
 {
 	struct pci_controller *hose;
 	volatile void __iomem *addr;

 	hose = pci_bus_to_host(bus);
 	if (hose == NULL)
 		return PCIBIOS_DEVICE_NOT_FOUND;

 	if (offset > 0xff)
 		return PCIBIOS_BAD_REGISTER_NUMBER;

 	addr = u3_ht_cfg_access(hose, bus->number, devfn, offset);
 	if (!addr)
 		return PCIBIOS_DEVICE_NOT_FOUND;

 	/*
 	 * Note: the caller has already checked that offset is
 	 * suitably aligned and that len is 1, 2 or 4.
 	 */
 	switch (len) {
 	case 1:
 		*val = in_8(addr);
 		break;
 	case 2:
 		*val = in_le16(addr);
 		break;
 	default:
 		*val = in_le32(addr);
 		break;
 	}
 	return PCIBIOS_SUCCESSFUL;
 }

 static int u3_ht_write_config(struct pci_bus *bus, unsigned int devfn,
 			      int offset, int len, u32 val)
 {
 	struct pci_controller *hose;
 	volatile void __iomem *addr;

 	hose = pci_bus_to_host(bus);
 	if (hose == NULL)
 		return PCIBIOS_DEVICE_NOT_FOUND;

 	if (offset > 0xff)
 		return PCIBIOS_BAD_REGISTER_NUMBER;

 	addr = u3_ht_cfg_access(hose, bus->number, devfn, offset);
 	if (!addr)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	/*
 	 * Note: the caller has already checked that offset is
 	 * suitably aligned and that len is 1, 2 or 4.
 	 */
 	switch (len) {
 	case 1:
 		out_8(addr, val);
 		break;
 	case 2:
 		out_le16(addr, val);
 		break;
 	default:
 		out_le32(addr, val);
 		break;
 	}
 	return PCIBIOS_SUCCESSFUL;
 }

 static struct pci_ops u3_ht_pci_ops =
 {
 	.read = u3_ht_read_config,
 	.write = u3_ht_write_config,
 };

 static unsigned int u4_pcie_cfa0(unsigned int devfn, unsigned int off)
 {
 	return (1 << PCI_SLOT(devfn))	|
 	       (PCI_FUNC(devfn) << 8)	|
 	       ((off >> 8) << 28) 	|
 	       (off & 0xfcu);
 }

 static unsigned int u4_pcie_cfa1(unsigned int bus, unsigned int devfn,
 				 unsigned int off)
 {
         return (bus << 16)		|
 	       (devfn << 8)		|
 	       ((off >> 8) << 28)	|
 	       (off & 0xfcu)		| 1u;
 }

 static volatile void __iomem *u4_pcie_cfg_access(struct pci_controller* hose,
                                         u8 bus, u8 dev_fn, int offset)
 {
         unsigned int caddr;

         if (bus == hose->first_busno)
                 caddr = u4_pcie_cfa0(dev_fn, offset);
         else
                 caddr = u4_pcie_cfa1(bus, dev_fn, offset);

         /* Uninorth will return garbage if we don't read back the value ! */
         do {
                 out_le32(hose->cfg_addr, caddr);
         } while (in_le32(hose->cfg_addr) != caddr);

         offset &= 0x03;
         return hose->cfg_data + offset;
 }

 static int u4_pcie_read_config(struct pci_bus *bus, unsigned int devfn,
                                int offset, int len, u32 *val)
 {
         struct pci_controller *hose;
         volatile void __iomem *addr;

         hose = pci_bus_to_host(bus);
         if (hose == NULL)
                 return PCIBIOS_DEVICE_NOT_FOUND;
         if (offset >= 0x1000)
                 return  PCIBIOS_BAD_REGISTER_NUMBER;
         addr = u4_pcie_cfg_access(hose, bus->number, devfn, offset);
         if (!addr)
                 return PCIBIOS_DEVICE_NOT_FOUND;
         /*
          * Note: the caller has already checked that offset is
          * suitably aligned and that len is 1, 2 or 4.
          */
         switch (len) {
         case 1:
                 *val = in_8(addr);
                 break;
         case 2:
                 *val = in_le16(addr);
                 break;
         default:
                 *val = in_le32(addr);
                 break;
         }
         return PCIBIOS_SUCCESSFUL;
 }
 static int u4_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
                                 int offset, int len, u32 val)
 {
         struct pci_controller *hose;
         volatile void __iomem *addr;

         hose = pci_bus_to_host(bus);
         if (hose == NULL)
                 return PCIBIOS_DEVICE_NOT_FOUND;
         if (offset >= 0x1000)
                 return  PCIBIOS_BAD_REGISTER_NUMBER;
         addr = u4_pcie_cfg_access(hose, bus->number, devfn, offset);
         if (!addr)
                 return PCIBIOS_DEVICE_NOT_FOUND;
         /*
          * Note: the caller has already checked that offset is
          * suitably aligned and that len is 1, 2 or 4.
          */
         switch (len) {
         case 1:
                 out_8(addr, val);
                 break;
         case 2:
                 out_le16(addr, val);
                 break;
         default:
                 out_le32(addr, val);
                 break;
         }
         return PCIBIOS_SUCCESSFUL;
 }

 static struct pci_ops u4_pcie_pci_ops =
 {
 	.read = u4_pcie_read_config,
 	.write = u4_pcie_write_config,
 };

 static void __init setup_u3_agp(struct pci_controller* hose)
 {
 	/* On G5, we move AGP up to high bus number so we don't need
 	 * to reassign bus numbers for HT. If we ever have P2P bridges
 	 * on AGP, we'll have to move pci_assign_all_buses to the
 	 * pci_controller structure so we enable it for AGP and not for
 	 * HT childs.
 	 * We hard code the address because of the different size of
 	 * the reg address cell, we shall fix that by killing struct
 	 * reg_property and using some accessor functions instead
 	 */
 	hose->first_busno = 0xf0;
 	hose->last_busno = 0xff;
 	hose->ops = &u3_agp_pci_ops;
 	hose->cfg_addr = ioremap(0xf0000000 + 0x800000, 0x1000);
 	hose->cfg_data = ioremap(0xf0000000 + 0xc00000, 0x1000);

 	u3_agp = hose;
 }

 static void __init setup_u4_pcie(struct pci_controller* hose)
 {
         /* We currently only implement the "non-atomic" config space, to
          * be optimised later.
          */
         hose->ops = &u4_pcie_pci_ops;
         hose->cfg_addr = ioremap(0xf0000000 + 0x800000, 0x1000);
         hose->cfg_data = ioremap(0xf0000000 + 0xc00000, 0x1000);

         u4_pcie = hose;
 }

 static void __init setup_u3_ht(struct pci_controller* hose)
 {
 	hose->ops = &u3_ht_pci_ops;

 	/* We hard code the address because of the different size of
 	 * the reg address cell, we shall fix that by killing struct
 	 * reg_property and using some accessor functions instead
 	 */
 	hose->cfg_data = ioremap(0xf2000000, 0x02000000);

 	hose->first_busno = 0;
 	hose->last_busno = 0xef;

 	u3_ht = hose;
 }

 static int __init maple_add_bridge(struct device_node *dev)
 {
 	int len;
 	struct pci_controller *hose;
 	char* disp_name;
 	const int *bus_range;
 	int primary = 1;

 	DBG("Adding PCI host bridge %s\n", dev->full_name);

 	bus_range = of_get_property(dev, "bus-range", &len);
 	if (bus_range == NULL || len < 2 * sizeof(int)) {
 		printk(KERN_WARNING "Can't get bus-range for %s, assume bus 0\n",
 		dev->full_name);
 	}

 	hose = pcibios_alloc_controller(dev);
 	if (hose == NULL)
 		return -ENOMEM;
 	hose->first_busno = bus_range ? bus_range[0] : 0;
 	hose->last_busno = bus_range ? bus_range[1] : 0xff;

 	disp_name = NULL;
 	if (of_device_is_compatible(dev, "u3-agp")) {
 		setup_u3_agp(hose);
 		disp_name = "U3-AGP";
 		primary = 0;
 	} else if (of_device_is_compatible(dev, "u3-ht")) {
 		setup_u3_ht(hose);
 		disp_name = "U3-HT";
 		primary = 1;
         } else if (of_device_is_compatible(dev, "u4-pcie")) {
                 setup_u4_pcie(hose);
                 disp_name = "U4-PCIE";
                 primary = 0;
 	}
 	printk(KERN_INFO "Found %s PCI host bridge. Firmware bus number: %d->%d\n",
 		disp_name, hose->first_busno, hose->last_busno);

 	/* Interpret the "ranges" property */
 	/* This also maps the I/O region and sets isa_io/mem_base */
 	pci_process_bridge_OF_ranges(hose, dev, primary);

 	/* Fixup "bus-range" OF property */
 	fixup_bus_range(dev);

 	/* Check for legacy IOs */
 	isa_bridge_find_early(hose);

 	return 0;
 }


 void __devinit maple_pci_irq_fixup(struct pci_dev *dev)
 {
 	DBG(" -> maple_pci_irq_fixup\n");

 	/* Fixup IRQ for PCIe host */
 	if (u4_pcie != NULL && dev->bus->number == 0 &&
 	    pci_bus_to_host(dev->bus) == u4_pcie) {
 		printk(KERN_DEBUG "Fixup U4 PCIe IRQ\n");
 		dev->irq = irq_create_mapping(NULL, 1);
 		if (dev->irq != NO_IRQ)
 			set_irq_type(dev->irq, IRQ_TYPE_LEVEL_LOW);
 	}

 	/* Hide AMD8111 IDE interrupt when in legacy mode so
 	 * the driver calls pci_get_legacy_ide_irq()
 	 */
 	if (dev->vendor == PCI_VENDOR_ID_AMD &&
 	    dev->device == PCI_DEVICE_ID_AMD_8111_IDE &&
 	    (dev->class & 5) != 5) {
 		dev->irq = NO_IRQ;
 	}

 	DBG(" <- maple_pci_irq_fixup\n");
 }

 void __init maple_pci_init(void)
 {
 	struct device_node *np, *root;
 	struct device_node *ht = NULL;

 	/* Probe root PCI hosts, that is on U3 the AGP host and the
 	 * HyperTransport host. That one is actually "kept" around
 	 * and actually added last as it's resource management relies
 	 * on the AGP resources to have been setup first
 	 */
 	root = of_find_node_by_path("/");
 	if (root == NULL) {
 		printk(KERN_CRIT "maple_find_bridges: can't find root of device tree\n");
 		return;
 	}
 	for (np = NULL; (np = of_get_next_child(root, np)) != NULL;) {
 		if (!np->type)
 			continue;
 		if (strcmp(np->type, "pci") && strcmp(np->type, "ht"))
 			continue;
 		if ((of_device_is_compatible(np, "u4-pcie") ||
 		     of_device_is_compatible(np, "u3-agp")) &&
 		    maple_add_bridge(np) == 0)
 			of_node_get(np);

 		if (of_device_is_compatible(np, "u3-ht")) {
 			of_node_get(np);
 			ht = np;
 		}
 	}
 	of_node_put(root);

 	/* Now setup the HyperTransport host if we found any
 	 */
 	if (ht && maple_add_bridge(ht) != 0)
 		of_node_put(ht);

 	/* Setup the linkage between OF nodes and PHBs */
 	pci_devs_phb_init();

 	/* Fixup the PCI<->OF mapping for U3 AGP due to bus renumbering. We
 	 * assume there is no P2P bridge on the AGP bus, which should be a
 	 * safe assumptions hopefully.
 	 */
 	if (u3_agp) {
 		struct device_node *np = u3_agp->dn;
 		PCI_DN(np)->busno = 0xf0;
 		for (np = np->child; np; np = np->sibling)
 			PCI_DN(np)->busno = 0xf0;
 	}

 	/* Tell pci.c to not change any resource allocations.  */
 	pci_probe_only = 1;
 }

 int maple_pci_get_legacy_ide_irq(struct pci_dev *pdev, int channel)
 {
 	struct device_node *np;
 	unsigned int defirq = channel ? 15 : 14;
 	unsigned int irq;

 	if (pdev->vendor != PCI_VENDOR_ID_AMD ||
 	    pdev->device != PCI_DEVICE_ID_AMD_8111_IDE)
 		return defirq;

 	np = pci_device_to_OF_node(pdev);
 	if (np == NULL) {
 		printk("Failed to locate OF node for IDE %s\n",
 		       pci_name(pdev));
 		return defirq;
 	}
 	irq = irq_of_parse_and_map(np, channel & 0x1);
 	if (irq == NO_IRQ) {
 		printk("Failed to map onboard IDE interrupt for channel %d\n",
 		       channel);
 		return defirq;
 	}
 	return irq;
 }
	/*
	* Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org),
	* IBM Corp.
	*
	* 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.
	*/

	#undef DEBUG

	#include <linux/kernel.h>
	#include <linux/pci.h>
	#include <linux/delay.h>
	#include <linux/string.h>
	#include <linux/init.h>
	#include <linux/bootmem.h>
	#include <linux/irq.h>

	#include <asm/sections.h>
	#include <asm/io.h>
	#include <asm/prom.h>
	#include <asm/pci-bridge.h>
	#include <asm/machdep.h>
	#include <asm/iommu.h>
	#include <asm/ppc-pci.h>

	#include "maple.h"

	#ifdef DEBUG
	#define DBG(x...) printk(x)
	#else
	#define DBG(x...)
	#endif

	static struct pci_controller u3_agp, u3_ht, *u4_pcie;

	static int __init fixup_one_level_bus_range(struct device_node *node, int higher)
	{
	for (; node != 0;node = node->sibling) {
	const int *bus_range;
	const unsigned int *class_code;
	int len;

	/* For PCI<->PCI bridges or CardBus bridges, we go down */
	class_code = of_get_property(node, "class-code", NULL);
	if (!class_code \|\| ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
	(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
	continue;
	bus_range = of_get_property(node, "bus-range", &len);
	if (bus_range != NULL && len > 2 * sizeof(int)) {
	if (bus_range[1] > higher)
	higher = bus_range[1];
	}
	higher = fixup_one_level_bus_range(node->child, higher);
	}
	return higher;
	}

	/* This routine fixes the "bus-range" property of all bridges in the
	* system since they tend to have their "last" member wrong on macs
	*
	* Note that the bus numbers manipulated here are OF bus numbers, they
	* are not Linux bus numbers.
	*/
	static void __init fixup_bus_range(struct device_node *bridge)
	{
	int *bus_range;
	struct property *prop;
	int len;

	/* Lookup the "bus-range" property for the hose */
	prop = of_find_property(bridge, "bus-range", &len);
	if (prop == NULL \|\| prop->value == NULL \|\| len < 2 * sizeof(int)) {
	printk(KERN_WARNING "Can't get bus-range for %s\n",
	bridge->full_name);
	return;
	}
	bus_range = prop->value;
	bus_range[1] = fixup_one_level_bus_range(bridge->child, bus_range[1]);
	}


	static unsigned long u3_agp_cfa0(u8 devfn, u8 off)
	{
	return (1 << (unsigned long)PCI_SLOT(devfn)) \|
	((unsigned long)PCI_FUNC(devfn) << 8) \|
	((unsigned long)off & 0xFCUL);
	}

	static unsigned long u3_agp_cfa1(u8 bus, u8 devfn, u8 off)
	{
	return ((unsigned long)bus << 16) \|
	((unsigned long)devfn << 8) \|
	((unsigned long)off & 0xFCUL) \|
	1UL;
	}

	static volatile void __iomem u3_agp_cfg_access(struct pci_controller hose,
	u8 bus, u8 dev_fn, u8 offset)
	{
	unsigned int caddr;

	if (bus == hose->first_busno) {
	if (dev_fn < (11 << 3))
	return NULL;
	caddr = u3_agp_cfa0(dev_fn, offset);
	} else
	caddr = u3_agp_cfa1(bus, dev_fn, offset);

	/* Uninorth will return garbage if we don't read back the value ! */
	do {
	out_le32(hose->cfg_addr, caddr);
	} while (in_le32(hose->cfg_addr) != caddr);

	offset &= 0x07;
	return hose->cfg_data + offset;
	}

	static int u3_agp_read_config(struct pci_bus *bus, unsigned int devfn,
	int offset, int len, u32 *val)
	{
	struct pci_controller *hose;
	volatile void __iomem *addr;

	hose = pci_bus_to_host(bus);
	if (hose == NULL)
	return PCIBIOS_DEVICE_NOT_FOUND;

	addr = u3_agp_cfg_access(hose, bus->number, devfn, offset);
	if (!addr)
	return PCIBIOS_DEVICE_NOT_FOUND;
	/*
	* Note: the caller has already checked that offset is
	* suitably aligned and that len is 1, 2 or 4.
	*/
	switch (len) {
	case 1:
	*val = in_8(addr);
	break;
	case 2:
	*val = in_le16(addr);
	break;
	default:
	*val = in_le32(addr);
	break;
	}
	return PCIBIOS_SUCCESSFUL;
	}

	static int u3_agp_write_config(struct pci_bus *bus, unsigned int devfn,
	int offset, int len, u32 val)
	{
	struct pci_controller *hose;
	volatile void __iomem *addr;

	hose = pci_bus_to_host(bus);
	if (hose == NULL)
	return PCIBIOS_DEVICE_NOT_FOUND;

	addr = u3_agp_cfg_access(hose, bus->number, devfn, offset);
	if (!addr)
	return PCIBIOS_DEVICE_NOT_FOUND;
	/*
	* Note: the caller has already checked that offset is
	* suitably aligned and that len is 1, 2 or 4.
	*/
	switch (len) {
	case 1:
	out_8(addr, val);
	break;
	case 2:
	out_le16(addr, val);
	break;
	default:
	out_le32(addr, val);
	break;
	}
	return PCIBIOS_SUCCESSFUL;
	}

	static struct pci_ops u3_agp_pci_ops =
	{
	.read = u3_agp_read_config,
	.write = u3_agp_write_config,
	};

	static unsigned long u3_ht_cfa0(u8 devfn, u8 off)
	{
	return (devfn << 8) \| off;
	}

	static unsigned long u3_ht_cfa1(u8 bus, u8 devfn, u8 off)
	{
	return u3_ht_cfa0(devfn, off) + (bus << 16) + 0x01000000UL;
	}

	static volatile void __iomem u3_ht_cfg_access(struct pci_controller hose,
	u8 bus, u8 devfn, u8 offset)
	{
	if (bus == hose->first_busno) {
	if (PCI_SLOT(devfn) == 0)
	return NULL;
	return hose->cfg_data + u3_ht_cfa0(devfn, offset);
	} else
	return hose->cfg_data + u3_ht_cfa1(bus, devfn, offset);
	}

	static int u3_ht_read_config(struct pci_bus *bus, unsigned int devfn,
	int offset, int len, u32 *val)
	{
	struct pci_controller *hose;
	volatile void __iomem *addr;

	hose = pci_bus_to_host(bus);
	if (hose == NULL)
	return PCIBIOS_DEVICE_NOT_FOUND;

	if (offset > 0xff)
	return PCIBIOS_BAD_REGISTER_NUMBER;

	addr = u3_ht_cfg_access(hose, bus->number, devfn, offset);
	if (!addr)
	return PCIBIOS_DEVICE_NOT_FOUND;

	/*
	* Note: the caller has already checked that offset is
	* suitably aligned and that len is 1, 2 or 4.
	*/
	switch (len) {
	case 1:
	*val = in_8(addr);
	break;
	case 2:
	*val = in_le16(addr);
	break;
	default:
	*val = in_le32(addr);
	break;
	}
	return PCIBIOS_SUCCESSFUL;
	}

	static int u3_ht_write_config(struct pci_bus *bus, unsigned int devfn,
	int offset, int len, u32 val)
	{
	struct pci_controller *hose;
	volatile void __iomem *addr;

	hose = pci_bus_to_host(bus);
	if (hose == NULL)
	return PCIBIOS_DEVICE_NOT_FOUND;

	if (offset > 0xff)
	return PCIBIOS_BAD_REGISTER_NUMBER;

	addr = u3_ht_cfg_access(hose, bus->number, devfn, offset);
	if (!addr)
	return PCIBIOS_DEVICE_NOT_FOUND;
	/*
	* Note: the caller has already checked that offset is
	* suitably aligned and that len is 1, 2 or 4.
	*/
	switch (len) {
	case 1:
	out_8(addr, val);
	break;
	case 2:
	out_le16(addr, val);
	break;
	default:
	out_le32(addr, val);
	break;
	}
	return PCIBIOS_SUCCESSFUL;
	}

	static struct pci_ops u3_ht_pci_ops =
	{
	.read = u3_ht_read_config,
	.write = u3_ht_write_config,
	};

	static unsigned int u4_pcie_cfa0(unsigned int devfn, unsigned int off)
	{
	return (1 << PCI_SLOT(devfn)) \|
	(PCI_FUNC(devfn) << 8) \|
	((off >> 8) << 28) \|
	(off & 0xfcu);
	}

	static unsigned int u4_pcie_cfa1(unsigned int bus, unsigned int devfn,
	unsigned int off)
	{
	return (bus << 16) \|
	(devfn << 8) \|
	((off >> 8) << 28) \|
	(off & 0xfcu) \| 1u;
	}

	static volatile void __iomem u4_pcie_cfg_access(struct pci_controller hose,
	u8 bus, u8 dev_fn, int offset)
	{
	unsigned int caddr;

	if (bus == hose->first_busno)
	caddr = u4_pcie_cfa0(dev_fn, offset);
	else
	caddr = u4_pcie_cfa1(bus, dev_fn, offset);

	/* Uninorth will return garbage if we don't read back the value ! */
	do {
	out_le32(hose->cfg_addr, caddr);
	} while (in_le32(hose->cfg_addr) != caddr);

	offset &= 0x03;
	return hose->cfg_data + offset;
	}

	static int u4_pcie_read_config(struct pci_bus *bus, unsigned int devfn,
	int offset, int len, u32 *val)
	{
	struct pci_controller *hose;
	volatile void __iomem *addr;

	hose = pci_bus_to_host(bus);
	if (hose == NULL)
	return PCIBIOS_DEVICE_NOT_FOUND;
	if (offset >= 0x1000)
	return PCIBIOS_BAD_REGISTER_NUMBER;
	addr = u4_pcie_cfg_access(hose, bus->number, devfn, offset);
	if (!addr)
	return PCIBIOS_DEVICE_NOT_FOUND;
	/*
	* Note: the caller has already checked that offset is
	* suitably aligned and that len is 1, 2 or 4.
	*/
	switch (len) {
	case 1:
	*val = in_8(addr);
	break;
	case 2:
	*val = in_le16(addr);
	break;
	default:
	*val = in_le32(addr);
	break;
	}
	return PCIBIOS_SUCCESSFUL;
	}
	static int u4_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
	int offset, int len, u32 val)
	{
	struct pci_controller *hose;
	volatile void __iomem *addr;

	hose = pci_bus_to_host(bus);
	if (hose == NULL)
	return PCIBIOS_DEVICE_NOT_FOUND;
	if (offset >= 0x1000)
	return PCIBIOS_BAD_REGISTER_NUMBER;
	addr = u4_pcie_cfg_access(hose, bus->number, devfn, offset);
	if (!addr)
	return PCIBIOS_DEVICE_NOT_FOUND;
	/*
	* Note: the caller has already checked that offset is
	* suitably aligned and that len is 1, 2 or 4.
	*/
	switch (len) {
	case 1:
	out_8(addr, val);
	break;
	case 2:
	out_le16(addr, val);
	break;
	default:
	out_le32(addr, val);
	break;
	}
	return PCIBIOS_SUCCESSFUL;
	}

	static struct pci_ops u4_pcie_pci_ops =
	{
	.read = u4_pcie_read_config,
	.write = u4_pcie_write_config,
	};

	static void __init setup_u3_agp(struct pci_controller* hose)
	{
	/* On G5, we move AGP up to high bus number so we don't need
	* to reassign bus numbers for HT. If we ever have P2P bridges
	* on AGP, we'll have to move pci_assign_all_buses to the
	* pci_controller structure so we enable it for AGP and not for
	* HT childs.
	* We hard code the address because of the different size of
	* the reg address cell, we shall fix that by killing struct
	* reg_property and using some accessor functions instead
	*/
	hose->first_busno = 0xf0;
	hose->last_busno = 0xff;
	hose->ops = &u3_agp_pci_ops;
	hose->cfg_addr = ioremap(0xf0000000 + 0x800000, 0x1000);
	hose->cfg_data = ioremap(0xf0000000 + 0xc00000, 0x1000);

	u3_agp = hose;
	}

	static void __init setup_u4_pcie(struct pci_controller* hose)
	{
	/* We currently only implement the "non-atomic" config space, to
	* be optimised later.
	*/
	hose->ops = &u4_pcie_pci_ops;
	hose->cfg_addr = ioremap(0xf0000000 + 0x800000, 0x1000);
	hose->cfg_data = ioremap(0xf0000000 + 0xc00000, 0x1000);

	u4_pcie = hose;
	}

	static void __init setup_u3_ht(struct pci_controller* hose)
	{
	hose->ops = &u3_ht_pci_ops;

	/* We hard code the address because of the different size of
	* the reg address cell, we shall fix that by killing struct
	* reg_property and using some accessor functions instead
	*/
	hose->cfg_data = ioremap(0xf2000000, 0x02000000);

	hose->first_busno = 0;
	hose->last_busno = 0xef;

	u3_ht = hose;
	}

	static int __init maple_add_bridge(struct device_node *dev)
	{
	int len;
	struct pci_controller *hose;
	char* disp_name;
	const int *bus_range;
	int primary = 1;

	DBG("Adding PCI host bridge %s\n", dev->full_name);

	bus_range = of_get_property(dev, "bus-range", &len);
	if (bus_range == NULL \|\| len < 2 * sizeof(int)) {
	printk(KERN_WARNING "Can't get bus-range for %s, assume bus 0\n",
	dev->full_name);
	}

	hose = pcibios_alloc_controller(dev);
	if (hose == NULL)
	return -ENOMEM;
	hose->first_busno = bus_range ? bus_range[0] : 0;
	hose->last_busno = bus_range ? bus_range[1] : 0xff;

	disp_name = NULL;
	if (of_device_is_compatible(dev, "u3-agp")) {
	setup_u3_agp(hose);
	disp_name = "U3-AGP";
	primary = 0;
	} else if (of_device_is_compatible(dev, "u3-ht")) {
	setup_u3_ht(hose);
	disp_name = "U3-HT";
	primary = 1;
	} else if (of_device_is_compatible(dev, "u4-pcie")) {
	setup_u4_pcie(hose);
	disp_name = "U4-PCIE";
	primary = 0;
	}
	printk(KERN_INFO "Found %s PCI host bridge. Firmware bus number: %d->%d\n",
	disp_name, hose->first_busno, hose->last_busno);

	/* Interpret the "ranges" property */
	/* This also maps the I/O region and sets isa_io/mem_base */
	pci_process_bridge_OF_ranges(hose, dev, primary);

	/* Fixup "bus-range" OF property */
	fixup_bus_range(dev);

	/* Check for legacy IOs */
	isa_bridge_find_early(hose);

	return 0;
	}


	void __devinit maple_pci_irq_fixup(struct pci_dev *dev)
	{
	DBG(" -> maple_pci_irq_fixup\n");

	/* Fixup IRQ for PCIe host */
	if (u4_pcie != NULL && dev->bus->number == 0 &&
	pci_bus_to_host(dev->bus) == u4_pcie) {
	printk(KERN_DEBUG "Fixup U4 PCIe IRQ\n");
	dev->irq = irq_create_mapping(NULL, 1);
	if (dev->irq != NO_IRQ)
	set_irq_type(dev->irq, IRQ_TYPE_LEVEL_LOW);
	}

	/* Hide AMD8111 IDE interrupt when in legacy mode so
	* the driver calls pci_get_legacy_ide_irq()
	*/
	if (dev->vendor == PCI_VENDOR_ID_AMD &&
	dev->device == PCI_DEVICE_ID_AMD_8111_IDE &&
	(dev->class & 5) != 5) {
	dev->irq = NO_IRQ;
	}

	DBG(" <- maple_pci_irq_fixup\n");
	}

	void __init maple_pci_init(void)
	{
	struct device_node np, root;
	struct device_node *ht = NULL;

	/* Probe root PCI hosts, that is on U3 the AGP host and the
	* HyperTransport host. That one is actually "kept" around
	* and actually added last as it's resource management relies
	* on the AGP resources to have been setup first
	*/
	root = of_find_node_by_path("/");
	if (root == NULL) {
	printk(KERN_CRIT "maple_find_bridges: can't find root of device tree\n");
	return;
	}
	for (np = NULL; (np = of_get_next_child(root, np)) != NULL;) {
	if (!np->type)
	continue;
	if (strcmp(np->type, "pci") && strcmp(np->type, "ht"))
	continue;
	if ((of_device_is_compatible(np, "u4-pcie") \|\|
	of_device_is_compatible(np, "u3-agp")) &&
	maple_add_bridge(np) == 0)
	of_node_get(np);

	if (of_device_is_compatible(np, "u3-ht")) {
	of_node_get(np);
	ht = np;
	}
	}
	of_node_put(root);

	/* Now setup the HyperTransport host if we found any
	*/
	if (ht && maple_add_bridge(ht) != 0)
	of_node_put(ht);

	/* Setup the linkage between OF nodes and PHBs */
	pci_devs_phb_init();

	/* Fixup the PCI<->OF mapping for U3 AGP due to bus renumbering. We
	* assume there is no P2P bridge on the AGP bus, which should be a
	* safe assumptions hopefully.
	*/
	if (u3_agp) {
	struct device_node *np = u3_agp->dn;
	PCI_DN(np)->busno = 0xf0;
	for (np = np->child; np; np = np->sibling)
	PCI_DN(np)->busno = 0xf0;
	}

	/* Tell pci.c to not change any resource allocations. */
	pci_probe_only = 1;
	}

	int maple_pci_get_legacy_ide_irq(struct pci_dev *pdev, int channel)
	{
	struct device_node *np;
	unsigned int defirq = channel ? 15 : 14;
	unsigned int irq;

	if (pdev->vendor != PCI_VENDOR_ID_AMD \|\|
	pdev->device != PCI_DEVICE_ID_AMD_8111_IDE)
	return defirq;

	np = pci_device_to_OF_node(pdev);
	if (np == NULL) {
	printk("Failed to locate OF node for IDE %s\n",
	pci_name(pdev));
	return defirq;
	}
	irq = irq_of_parse_and_map(np, channel & 0x1);
	if (irq == NO_IRQ) {
	printk("Failed to map onboard IDE interrupt for channel %d\n",
	channel);
	return defirq;
	}
	return irq;
	}