arch/mips/pci/ops-bcm63xx.c - kernel/msm-4.9 - Gitiles

 /*
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
  * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
  */

 #include <linux/types.h>
 #include <linux/pci.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/io.h>

 #include "pci-bcm63xx.h"

 /*
  * swizzle 32bits data to return only the needed part
  */
 static int postprocess_read(u32 data, int where, unsigned int size)
 {
 	u32 ret;

 	ret = 0;
 	switch (size) {
 	case 1:
 		ret = (data >> ((where & 3) << 3)) & 0xff;
 		break;
 	case 2:
 		ret = (data >> ((where & 3) << 3)) & 0xffff;
 		break;
 	case 4:
 		ret = data;
 		break;
 	}
 	return ret;
 }

 static int preprocess_write(u32 orig_data, u32 val, int where,
 			    unsigned int size)
 {
 	u32 ret;

 	ret = 0;
 	switch (size) {
 	case 1:
 		ret = (orig_data & ~(0xff << ((where & 3) << 3))) |
 			(val << ((where & 3) << 3));
 		break;
 	case 2:
 		ret = (orig_data & ~(0xffff << ((where & 3) << 3))) |
 			(val << ((where & 3) << 3));
 		break;
 	case 4:
 		ret = val;
 		break;
 	}
 	return ret;
 }

 /*
  * setup hardware for a configuration cycle with given parameters
  */
 static int bcm63xx_setup_cfg_access(int type, unsigned int busn,
 				    unsigned int devfn, int where)
 {
 	unsigned int slot, func, reg;
 	u32 val;

 	slot = PCI_SLOT(devfn);
 	func = PCI_FUNC(devfn);
 	reg = where >> 2;

 	/* sanity check */
 	if (slot > (MPI_L2PCFG_DEVNUM_MASK >> MPI_L2PCFG_DEVNUM_SHIFT))
 		return 1;

 	if (func > (MPI_L2PCFG_FUNC_MASK >> MPI_L2PCFG_FUNC_SHIFT))
 		return 1;

 	if (reg > (MPI_L2PCFG_REG_MASK >> MPI_L2PCFG_REG_SHIFT))
 		return 1;

 	/* ok, setup config access */
 	val = (reg << MPI_L2PCFG_REG_SHIFT);
 	val |= (func << MPI_L2PCFG_FUNC_SHIFT);
 	val |= (slot << MPI_L2PCFG_DEVNUM_SHIFT);
 	val |= MPI_L2PCFG_CFG_USEREG_MASK;
 	val |= MPI_L2PCFG_CFG_SEL_MASK;
 	/* type 0 cycle for local bus, type 1 cycle for anything else */
 	if (type != 0) {
 		/* FIXME: how to specify bus ??? */
 		val |= (1 << MPI_L2PCFG_CFG_TYPE_SHIFT);
 	}
 	bcm_mpi_writel(val, MPI_L2PCFG_REG);

 	return 0;
 }

 static int bcm63xx_do_cfg_read(int type, unsigned int busn,
 				unsigned int devfn, int where, int size,
 				u32 *val)
 {
 	u32 data;

 	/* two phase cycle, first we write address, then read data at
 	 * another location, caller already has a spinlock so no need
 	 * to add one here  */
 	if (bcm63xx_setup_cfg_access(type, busn, devfn, where))
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	iob();
 	data = le32_to_cpu(__raw_readl(pci_iospace_start));
 	/* restore IO space normal behaviour */
 	bcm_mpi_writel(0, MPI_L2PCFG_REG);

 	*val = postprocess_read(data, where, size);

 	return PCIBIOS_SUCCESSFUL;
 }

 static int bcm63xx_do_cfg_write(int type, unsigned int busn,
 				 unsigned int devfn, int where, int size,
 				 u32 val)
 {
 	u32 data;

 	/* two phase cycle, first we write address, then write data to
 	 * another location, caller already has a spinlock so no need
 	 * to add one here  */
 	if (bcm63xx_setup_cfg_access(type, busn, devfn, where))
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	iob();

 	data = le32_to_cpu(__raw_readl(pci_iospace_start));
 	data = preprocess_write(data, val, where, size);

 	__raw_writel(cpu_to_le32(data), pci_iospace_start);
 	wmb();
 	/* no way to know the access is done, we have to wait */
 	udelay(500);
 	/* restore IO space normal behaviour */
 	bcm_mpi_writel(0, MPI_L2PCFG_REG);

 	return PCIBIOS_SUCCESSFUL;
 }

 static int bcm63xx_pci_read(struct pci_bus *bus, unsigned int devfn,
 			     int where, int size, u32 *val)
 {
 	int type;

 	type = bus->parent ? 1 : 0;

 	if (type == 0 && PCI_SLOT(devfn) == CARDBUS_PCI_IDSEL)
 		return PCIBIOS_DEVICE_NOT_FOUND;

 	return bcm63xx_do_cfg_read(type, bus->number, devfn,
 				    where, size, val);
 }

 static int bcm63xx_pci_write(struct pci_bus *bus, unsigned int devfn,
 			      int where, int size, u32 val)
 {
 	int type;

 	type = bus->parent ? 1 : 0;

 	if (type == 0 && PCI_SLOT(devfn) == CARDBUS_PCI_IDSEL)
 		return PCIBIOS_DEVICE_NOT_FOUND;

 	return bcm63xx_do_cfg_write(type, bus->number, devfn,
 				     where, size, val);
 }

 struct pci_ops bcm63xx_pci_ops = {
 	.read   = bcm63xx_pci_read,
 	.write  = bcm63xx_pci_write
 };

 #ifdef CONFIG_CARDBUS
 /*
  * emulate configuration read access on a cardbus bridge
  */
 #define FAKE_CB_BRIDGE_SLOT	0x1e

 static int fake_cb_bridge_bus_number = -1;

 static struct {
 	u16 pci_command;
 	u8 cb_latency;
 	u8 subordinate_busn;
 	u8 cardbus_busn;
 	u8 pci_busn;
 	int bus_assigned;
 	u16 bridge_control;

 	u32 mem_base0;
 	u32 mem_limit0;
 	u32 mem_base1;
 	u32 mem_limit1;

 	u32 io_base0;
 	u32 io_limit0;
 	u32 io_base1;
 	u32 io_limit1;
 } fake_cb_bridge_regs;

 static int fake_cb_bridge_read(int where, int size, u32 *val)
 {
 	unsigned int reg;
 	u32 data;

 	data = 0;
 	reg = where >> 2;
 	switch (reg) {
 	case (PCI_VENDOR_ID >> 2):
 	case (PCI_CB_SUBSYSTEM_VENDOR_ID >> 2):
 		/* create dummy vendor/device id from our cpu id */
 		data = (bcm63xx_get_cpu_id() << 16) | PCI_VENDOR_ID_BROADCOM;
 		break;

 	case (PCI_COMMAND >> 2):
 		data = (PCI_STATUS_DEVSEL_SLOW << 16);
 		data |= fake_cb_bridge_regs.pci_command;
 		break;

 	case (PCI_CLASS_REVISION >> 2):
 		data = (PCI_CLASS_BRIDGE_CARDBUS << 16);
 		break;

 	case (PCI_CACHE_LINE_SIZE >> 2):
 		data = (PCI_HEADER_TYPE_CARDBUS << 16);
 		break;

 	case (PCI_INTERRUPT_LINE >> 2):
 		/* bridge control */
 		data = (fake_cb_bridge_regs.bridge_control << 16);
 		/* pin:intA line:0xff */
 		data |= (0x1 << 8) | 0xff;
 		break;

 	case (PCI_CB_PRIMARY_BUS >> 2):
 		data = (fake_cb_bridge_regs.cb_latency << 24);
 		data |= (fake_cb_bridge_regs.subordinate_busn << 16);
 		data |= (fake_cb_bridge_regs.cardbus_busn << 8);
 		data |= fake_cb_bridge_regs.pci_busn;
 		break;

 	case (PCI_CB_MEMORY_BASE_0 >> 2):
 		data = fake_cb_bridge_regs.mem_base0;
 		break;

 	case (PCI_CB_MEMORY_LIMIT_0 >> 2):
 		data = fake_cb_bridge_regs.mem_limit0;
 		break;

 	case (PCI_CB_MEMORY_BASE_1 >> 2):
 		data = fake_cb_bridge_regs.mem_base1;
 		break;

 	case (PCI_CB_MEMORY_LIMIT_1 >> 2):
 		data = fake_cb_bridge_regs.mem_limit1;
 		break;

 	case (PCI_CB_IO_BASE_0 >> 2):
 		/* | 1 for 32bits io support */
 		data = fake_cb_bridge_regs.io_base0 | 0x1;
 		break;

 	case (PCI_CB_IO_LIMIT_0 >> 2):
 		data = fake_cb_bridge_regs.io_limit0;
 		break;

 	case (PCI_CB_IO_BASE_1 >> 2):
 		/* | 1 for 32bits io support */
 		data = fake_cb_bridge_regs.io_base1 | 0x1;
 		break;

 	case (PCI_CB_IO_LIMIT_1 >> 2):
 		data = fake_cb_bridge_regs.io_limit1;
 		break;
 	}

 	*val = postprocess_read(data, where, size);
 	return PCIBIOS_SUCCESSFUL;
 }

 /*
  * emulate configuration write access on a cardbus bridge
  */
 static int fake_cb_bridge_write(int where, int size, u32 val)
 {
 	unsigned int reg;
 	u32 data, tmp;
 	int ret;

 	ret = fake_cb_bridge_read((where & ~0x3), 4, &data);
 	if (ret != PCIBIOS_SUCCESSFUL)
 		return ret;

 	data = preprocess_write(data, val, where, size);

 	reg = where >> 2;
 	switch (reg) {
 	case (PCI_COMMAND >> 2):
 		fake_cb_bridge_regs.pci_command = (data & 0xffff);
 		break;

 	case (PCI_CB_PRIMARY_BUS >> 2):
 		fake_cb_bridge_regs.cb_latency = (data >> 24) & 0xff;
 		fake_cb_bridge_regs.subordinate_busn = (data >> 16) & 0xff;
 		fake_cb_bridge_regs.cardbus_busn = (data >> 8) & 0xff;
 		fake_cb_bridge_regs.pci_busn = data & 0xff;
 		if (fake_cb_bridge_regs.cardbus_busn)
 			fake_cb_bridge_regs.bus_assigned = 1;
 		break;

 	case (PCI_INTERRUPT_LINE >> 2):
 		tmp = (data >> 16) & 0xffff;
 		/* disable memory prefetch support */
 		tmp &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
 		tmp &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1;
 		fake_cb_bridge_regs.bridge_control = tmp;
 		break;

 	case (PCI_CB_MEMORY_BASE_0 >> 2):
 		fake_cb_bridge_regs.mem_base0 = data;
 		break;

 	case (PCI_CB_MEMORY_LIMIT_0 >> 2):
 		fake_cb_bridge_regs.mem_limit0 = data;
 		break;

 	case (PCI_CB_MEMORY_BASE_1 >> 2):
 		fake_cb_bridge_regs.mem_base1 = data;
 		break;

 	case (PCI_CB_MEMORY_LIMIT_1 >> 2):
 		fake_cb_bridge_regs.mem_limit1 = data;
 		break;

 	case (PCI_CB_IO_BASE_0 >> 2):
 		fake_cb_bridge_regs.io_base0 = data;
 		break;

 	case (PCI_CB_IO_LIMIT_0 >> 2):
 		fake_cb_bridge_regs.io_limit0 = data;
 		break;

 	case (PCI_CB_IO_BASE_1 >> 2):
 		fake_cb_bridge_regs.io_base1 = data;
 		break;

 	case (PCI_CB_IO_LIMIT_1 >> 2):
 		fake_cb_bridge_regs.io_limit1 = data;
 		break;
 	}

 	return PCIBIOS_SUCCESSFUL;
 }

 static int bcm63xx_cb_read(struct pci_bus *bus, unsigned int devfn,
 			   int where, int size, u32 *val)
 {
 	/* snoop access to slot 0x1e on root bus, we fake a cardbus
 	 * bridge at this location */
 	if (!bus->parent && PCI_SLOT(devfn) == FAKE_CB_BRIDGE_SLOT) {
 		fake_cb_bridge_bus_number = bus->number;
 		return fake_cb_bridge_read(where, size, val);
 	}

 	/* a  configuration  cycle for  the  device  behind the  cardbus
 	 * bridge is  actually done as a  type 0 cycle  on the primary
 	 * bus. This means that only  one device can be on the cardbus
 	 * bus */
 	if (fake_cb_bridge_regs.bus_assigned &&
 	    bus->number == fake_cb_bridge_regs.cardbus_busn &&
 	    PCI_SLOT(devfn) == 0)
 		return bcm63xx_do_cfg_read(0, 0,
 					   PCI_DEVFN(CARDBUS_PCI_IDSEL, 0),
 					   where, size, val);

 	return PCIBIOS_DEVICE_NOT_FOUND;
 }

 static int bcm63xx_cb_write(struct pci_bus *bus, unsigned int devfn,
 			    int where, int size, u32 val)
 {
 	if (!bus->parent && PCI_SLOT(devfn) == FAKE_CB_BRIDGE_SLOT) {
 		fake_cb_bridge_bus_number = bus->number;
 		return fake_cb_bridge_write(where, size, val);
 	}

 	if (fake_cb_bridge_regs.bus_assigned &&
 	    bus->number == fake_cb_bridge_regs.cardbus_busn &&
 	    PCI_SLOT(devfn) == 0)
 		return bcm63xx_do_cfg_write(0, 0,
 					    PCI_DEVFN(CARDBUS_PCI_IDSEL, 0),
 					    where, size, val);

 	return PCIBIOS_DEVICE_NOT_FOUND;
 }

 struct pci_ops bcm63xx_cb_ops = {
 	.read   = bcm63xx_cb_read,
 	.write   = bcm63xx_cb_write,
 };

 /*
  * only one IO window, so it  cannot be shared by PCI and cardbus, use
  * fixup to choose and detect unhandled configuration
  */
 static void bcm63xx_fixup(struct pci_dev *dev)
 {
 	static int io_window = -1;
 	int i, found, new_io_window;
 	u32 val;

 	/* look for any io resource */
 	found = 0;
 	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 		if (pci_resource_flags(dev, i) & IORESOURCE_IO) {
 			found = 1;
 			break;
 		}
 	}

 	if (!found)
 		return;

 	/* skip our fake bus with only cardbus bridge on it */
 	if (dev->bus->number == fake_cb_bridge_bus_number)
 		return;

 	/* find on which bus the device is */
 	if (fake_cb_bridge_regs.bus_assigned &&
 	    dev->bus->number == fake_cb_bridge_regs.cardbus_busn &&
 	    PCI_SLOT(dev->devfn) == 0)
 		new_io_window = 1;
 	else
 		new_io_window = 0;

 	if (new_io_window == io_window)
 		return;

 	if (io_window != -1) {
 		printk(KERN_ERR "bcm63xx: both PCI and cardbus devices "
 		       "need IO, which hardware cannot do\n");
 		return;
 	}

 	printk(KERN_INFO "bcm63xx: PCI IO window assigned to %s\n",
 	       (new_io_window == 0) ? "PCI" : "cardbus");

 	val = bcm_mpi_readl(MPI_L2PIOREMAP_REG);
 	if (io_window)
 		val |= MPI_L2PREMAP_IS_CARDBUS_MASK;
 	else
 		val &= ~MPI_L2PREMAP_IS_CARDBUS_MASK;
 	bcm_mpi_writel(val, MPI_L2PIOREMAP_REG);

 	io_window = new_io_window;
 }

 DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, bcm63xx_fixup);
 #endif
	/*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file "COPYING" in the main directory of this archive
	* for more details.
	*
	* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
	*/

	#include <linux/types.h>
	#include <linux/pci.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/delay.h>
	#include <linux/io.h>

	#include "pci-bcm63xx.h"

	/*
	* swizzle 32bits data to return only the needed part
	*/
	static int postprocess_read(u32 data, int where, unsigned int size)
	{
	u32 ret;

	ret = 0;
	switch (size) {
	case 1:
	ret = (data >> ((where & 3) << 3)) & 0xff;
	break;
	case 2:
	ret = (data >> ((where & 3) << 3)) & 0xffff;
	break;
	case 4:
	ret = data;
	break;
	}
	return ret;
	}

	static int preprocess_write(u32 orig_data, u32 val, int where,
	unsigned int size)
	{
	u32 ret;

	ret = 0;
	switch (size) {
	case 1:
	ret = (orig_data & ~(0xff << ((where & 3) << 3))) \|
	(val << ((where & 3) << 3));
	break;
	case 2:
	ret = (orig_data & ~(0xffff << ((where & 3) << 3))) \|
	(val << ((where & 3) << 3));
	break;
	case 4:
	ret = val;
	break;
	}
	return ret;
	}

	/*
	* setup hardware for a configuration cycle with given parameters
	*/
	static int bcm63xx_setup_cfg_access(int type, unsigned int busn,
	unsigned int devfn, int where)
	{
	unsigned int slot, func, reg;
	u32 val;

	slot = PCI_SLOT(devfn);
	func = PCI_FUNC(devfn);
	reg = where >> 2;

	/* sanity check */
	if (slot > (MPI_L2PCFG_DEVNUM_MASK >> MPI_L2PCFG_DEVNUM_SHIFT))
	return 1;

	if (func > (MPI_L2PCFG_FUNC_MASK >> MPI_L2PCFG_FUNC_SHIFT))
	return 1;

	if (reg > (MPI_L2PCFG_REG_MASK >> MPI_L2PCFG_REG_SHIFT))
	return 1;

	/* ok, setup config access */
	val = (reg << MPI_L2PCFG_REG_SHIFT);
	val \|= (func << MPI_L2PCFG_FUNC_SHIFT);
	val \|= (slot << MPI_L2PCFG_DEVNUM_SHIFT);
	val \|= MPI_L2PCFG_CFG_USEREG_MASK;
	val \|= MPI_L2PCFG_CFG_SEL_MASK;
	/* type 0 cycle for local bus, type 1 cycle for anything else */
	if (type != 0) {
	/* FIXME: how to specify bus ??? */
	val \|= (1 << MPI_L2PCFG_CFG_TYPE_SHIFT);
	}
	bcm_mpi_writel(val, MPI_L2PCFG_REG);

	return 0;
	}

	static int bcm63xx_do_cfg_read(int type, unsigned int busn,
	unsigned int devfn, int where, int size,
	u32 *val)
	{
	u32 data;

	/* two phase cycle, first we write address, then read data at
	* another location, caller already has a spinlock so no need
	* to add one here */
	if (bcm63xx_setup_cfg_access(type, busn, devfn, where))
	return PCIBIOS_DEVICE_NOT_FOUND;
	iob();
	data = le32_to_cpu(__raw_readl(pci_iospace_start));
	/* restore IO space normal behaviour */
	bcm_mpi_writel(0, MPI_L2PCFG_REG);

	*val = postprocess_read(data, where, size);

	return PCIBIOS_SUCCESSFUL;
	}

	static int bcm63xx_do_cfg_write(int type, unsigned int busn,
	unsigned int devfn, int where, int size,
	u32 val)
	{
	u32 data;

	/* two phase cycle, first we write address, then write data to
	* another location, caller already has a spinlock so no need
	* to add one here */
	if (bcm63xx_setup_cfg_access(type, busn, devfn, where))
	return PCIBIOS_DEVICE_NOT_FOUND;
	iob();

	data = le32_to_cpu(__raw_readl(pci_iospace_start));
	data = preprocess_write(data, val, where, size);

	__raw_writel(cpu_to_le32(data), pci_iospace_start);
	wmb();
	/* no way to know the access is done, we have to wait */
	udelay(500);
	/* restore IO space normal behaviour */
	bcm_mpi_writel(0, MPI_L2PCFG_REG);

	return PCIBIOS_SUCCESSFUL;
	}

	static int bcm63xx_pci_read(struct pci_bus *bus, unsigned int devfn,
	int where, int size, u32 *val)
	{
	int type;

	type = bus->parent ? 1 : 0;

	if (type == 0 && PCI_SLOT(devfn) == CARDBUS_PCI_IDSEL)
	return PCIBIOS_DEVICE_NOT_FOUND;

	return bcm63xx_do_cfg_read(type, bus->number, devfn,
	where, size, val);
	}

	static int bcm63xx_pci_write(struct pci_bus *bus, unsigned int devfn,
	int where, int size, u32 val)
	{
	int type;

	type = bus->parent ? 1 : 0;

	if (type == 0 && PCI_SLOT(devfn) == CARDBUS_PCI_IDSEL)
	return PCIBIOS_DEVICE_NOT_FOUND;

	return bcm63xx_do_cfg_write(type, bus->number, devfn,
	where, size, val);
	}

	struct pci_ops bcm63xx_pci_ops = {
	.read = bcm63xx_pci_read,
	.write = bcm63xx_pci_write
	};

	#ifdef CONFIG_CARDBUS
	/*
	* emulate configuration read access on a cardbus bridge
	*/
	#define FAKE_CB_BRIDGE_SLOT 0x1e

	static int fake_cb_bridge_bus_number = -1;

	static struct {
	u16 pci_command;
	u8 cb_latency;
	u8 subordinate_busn;
	u8 cardbus_busn;
	u8 pci_busn;
	int bus_assigned;
	u16 bridge_control;

	u32 mem_base0;
	u32 mem_limit0;
	u32 mem_base1;
	u32 mem_limit1;

	u32 io_base0;
	u32 io_limit0;
	u32 io_base1;
	u32 io_limit1;
	} fake_cb_bridge_regs;

	static int fake_cb_bridge_read(int where, int size, u32 *val)
	{
	unsigned int reg;
	u32 data;

	data = 0;
	reg = where >> 2;
	switch (reg) {
	case (PCI_VENDOR_ID >> 2):
	case (PCI_CB_SUBSYSTEM_VENDOR_ID >> 2):
	/* create dummy vendor/device id from our cpu id */
	data = (bcm63xx_get_cpu_id() << 16) \| PCI_VENDOR_ID_BROADCOM;
	break;

	case (PCI_COMMAND >> 2):
	data = (PCI_STATUS_DEVSEL_SLOW << 16);
	data \|= fake_cb_bridge_regs.pci_command;
	break;

	case (PCI_CLASS_REVISION >> 2):
	data = (PCI_CLASS_BRIDGE_CARDBUS << 16);
	break;

	case (PCI_CACHE_LINE_SIZE >> 2):
	data = (PCI_HEADER_TYPE_CARDBUS << 16);
	break;

	case (PCI_INTERRUPT_LINE >> 2):
	/* bridge control */
	data = (fake_cb_bridge_regs.bridge_control << 16);
	/* pin:intA line:0xff */
	data \|= (0x1 << 8) \| 0xff;
	break;

	case (PCI_CB_PRIMARY_BUS >> 2):
	data = (fake_cb_bridge_regs.cb_latency << 24);
	data \|= (fake_cb_bridge_regs.subordinate_busn << 16);
	data \|= (fake_cb_bridge_regs.cardbus_busn << 8);
	data \|= fake_cb_bridge_regs.pci_busn;
	break;

	case (PCI_CB_MEMORY_BASE_0 >> 2):
	data = fake_cb_bridge_regs.mem_base0;
	break;

	case (PCI_CB_MEMORY_LIMIT_0 >> 2):
	data = fake_cb_bridge_regs.mem_limit0;
	break;

	case (PCI_CB_MEMORY_BASE_1 >> 2):
	data = fake_cb_bridge_regs.mem_base1;
	break;

	case (PCI_CB_MEMORY_LIMIT_1 >> 2):
	data = fake_cb_bridge_regs.mem_limit1;
	break;

	case (PCI_CB_IO_BASE_0 >> 2):
	/* \| 1 for 32bits io support */
	data = fake_cb_bridge_regs.io_base0 \| 0x1;
	break;

	case (PCI_CB_IO_LIMIT_0 >> 2):
	data = fake_cb_bridge_regs.io_limit0;
	break;

	case (PCI_CB_IO_BASE_1 >> 2):
	/* \| 1 for 32bits io support */
	data = fake_cb_bridge_regs.io_base1 \| 0x1;
	break;

	case (PCI_CB_IO_LIMIT_1 >> 2):
	data = fake_cb_bridge_regs.io_limit1;
	break;
	}

	*val = postprocess_read(data, where, size);
	return PCIBIOS_SUCCESSFUL;
	}

	/*
	* emulate configuration write access on a cardbus bridge
	*/
	static int fake_cb_bridge_write(int where, int size, u32 val)
	{
	unsigned int reg;
	u32 data, tmp;
	int ret;

	ret = fake_cb_bridge_read((where & ~0x3), 4, &data);
	if (ret != PCIBIOS_SUCCESSFUL)
	return ret;

	data = preprocess_write(data, val, where, size);

	reg = where >> 2;
	switch (reg) {
	case (PCI_COMMAND >> 2):
	fake_cb_bridge_regs.pci_command = (data & 0xffff);
	break;

	case (PCI_CB_PRIMARY_BUS >> 2):
	fake_cb_bridge_regs.cb_latency = (data >> 24) & 0xff;
	fake_cb_bridge_regs.subordinate_busn = (data >> 16) & 0xff;
	fake_cb_bridge_regs.cardbus_busn = (data >> 8) & 0xff;
	fake_cb_bridge_regs.pci_busn = data & 0xff;
	if (fake_cb_bridge_regs.cardbus_busn)
	fake_cb_bridge_regs.bus_assigned = 1;
	break;

	case (PCI_INTERRUPT_LINE >> 2):
	tmp = (data >> 16) & 0xffff;
	/* disable memory prefetch support */
	tmp &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
	tmp &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1;
	fake_cb_bridge_regs.bridge_control = tmp;
	break;

	case (PCI_CB_MEMORY_BASE_0 >> 2):
	fake_cb_bridge_regs.mem_base0 = data;
	break;

	case (PCI_CB_MEMORY_LIMIT_0 >> 2):
	fake_cb_bridge_regs.mem_limit0 = data;
	break;

	case (PCI_CB_MEMORY_BASE_1 >> 2):
	fake_cb_bridge_regs.mem_base1 = data;
	break;

	case (PCI_CB_MEMORY_LIMIT_1 >> 2):
	fake_cb_bridge_regs.mem_limit1 = data;
	break;

	case (PCI_CB_IO_BASE_0 >> 2):
	fake_cb_bridge_regs.io_base0 = data;
	break;

	case (PCI_CB_IO_LIMIT_0 >> 2):
	fake_cb_bridge_regs.io_limit0 = data;
	break;

	case (PCI_CB_IO_BASE_1 >> 2):
	fake_cb_bridge_regs.io_base1 = data;
	break;

	case (PCI_CB_IO_LIMIT_1 >> 2):
	fake_cb_bridge_regs.io_limit1 = data;
	break;
	}

	return PCIBIOS_SUCCESSFUL;
	}

	static int bcm63xx_cb_read(struct pci_bus *bus, unsigned int devfn,
	int where, int size, u32 *val)
	{
	/* snoop access to slot 0x1e on root bus, we fake a cardbus
	* bridge at this location */
	if (!bus->parent && PCI_SLOT(devfn) == FAKE_CB_BRIDGE_SLOT) {
	fake_cb_bridge_bus_number = bus->number;
	return fake_cb_bridge_read(where, size, val);
	}

	/* a configuration cycle for the device behind the cardbus
	* bridge is actually done as a type 0 cycle on the primary
	* bus. This means that only one device can be on the cardbus
	* bus */
	if (fake_cb_bridge_regs.bus_assigned &&
	bus->number == fake_cb_bridge_regs.cardbus_busn &&
	PCI_SLOT(devfn) == 0)
	return bcm63xx_do_cfg_read(0, 0,
	PCI_DEVFN(CARDBUS_PCI_IDSEL, 0),
	where, size, val);

	return PCIBIOS_DEVICE_NOT_FOUND;
	}

	static int bcm63xx_cb_write(struct pci_bus *bus, unsigned int devfn,
	int where, int size, u32 val)
	{
	if (!bus->parent && PCI_SLOT(devfn) == FAKE_CB_BRIDGE_SLOT) {
	fake_cb_bridge_bus_number = bus->number;
	return fake_cb_bridge_write(where, size, val);
	}

	if (fake_cb_bridge_regs.bus_assigned &&
	bus->number == fake_cb_bridge_regs.cardbus_busn &&
	PCI_SLOT(devfn) == 0)
	return bcm63xx_do_cfg_write(0, 0,
	PCI_DEVFN(CARDBUS_PCI_IDSEL, 0),
	where, size, val);

	return PCIBIOS_DEVICE_NOT_FOUND;
	}

	struct pci_ops bcm63xx_cb_ops = {
	.read = bcm63xx_cb_read,
	.write = bcm63xx_cb_write,
	};

	/*
	* only one IO window, so it cannot be shared by PCI and cardbus, use
	* fixup to choose and detect unhandled configuration
	*/
	static void bcm63xx_fixup(struct pci_dev *dev)
	{
	static int io_window = -1;
	int i, found, new_io_window;
	u32 val;

	/* look for any io resource */
	found = 0;
	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
	if (pci_resource_flags(dev, i) & IORESOURCE_IO) {
	found = 1;
	break;
	}
	}

	if (!found)
	return;

	/* skip our fake bus with only cardbus bridge on it */
	if (dev->bus->number == fake_cb_bridge_bus_number)
	return;

	/* find on which bus the device is */
	if (fake_cb_bridge_regs.bus_assigned &&
	dev->bus->number == fake_cb_bridge_regs.cardbus_busn &&
	PCI_SLOT(dev->devfn) == 0)
	new_io_window = 1;
	else
	new_io_window = 0;

	if (new_io_window == io_window)
	return;

	if (io_window != -1) {
	printk(KERN_ERR "bcm63xx: both PCI and cardbus devices "
	"need IO, which hardware cannot do\n");
	return;
	}

	printk(KERN_INFO "bcm63xx: PCI IO window assigned to %s\n",
	(new_io_window == 0) ? "PCI" : "cardbus");

	val = bcm_mpi_readl(MPI_L2PIOREMAP_REG);
	if (io_window)
	val \|= MPI_L2PREMAP_IS_CARDBUS_MASK;
	else
	val &= ~MPI_L2PREMAP_IS_CARDBUS_MASK;
	bcm_mpi_writel(val, MPI_L2PIOREMAP_REG);

	io_window = new_io_window;
	}

	DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, bcm63xx_fixup);
	#endif