arch/unicore32/kernel/pci.c - arm/linux-arm64-legacy - Git at Google

 /*
  * linux/arch/unicore32/kernel/pci.c
  *
  * Code specific to PKUnity SoC and UniCore ISA
  *
  * Copyright (C) 2001-2010 GUAN Xue-tao
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  *  PCI bios-type initialisation for PCI machines
  *
  */
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/interrupt.h>
 #include <linux/pci.h>
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/io.h>

 static int debug_pci;
 static int use_firmware;

 #define CONFIG_CMD(bus, devfn, where)	\
 	(0x80000000 | (bus->number << 16) | (devfn << 8) | (where & ~3))

 static int
 puv3_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 			int size, u32 *value)
 {
 	writel(CONFIG_CMD(bus, devfn, where), PCICFG_ADDR);
 	switch (size) {
 	case 1:
 		*value = (readl(PCICFG_DATA) >> ((where & 3) * 8)) & 0xFF;
 		break;
 	case 2:
 		*value = (readl(PCICFG_DATA) >> ((where & 2) * 8)) & 0xFFFF;
 		break;
 	case 4:
 		*value = readl(PCICFG_DATA);
 		break;
 	}
 	return PCIBIOS_SUCCESSFUL;
 }

 static int
 puv3_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 			int size, u32 value)
 {
 	writel(CONFIG_CMD(bus, devfn, where), PCICFG_ADDR);
 	switch (size) {
 	case 1:
 		writel((readl(PCICFG_DATA) & ~FMASK(8, (where&3)*8))
 			| FIELD(value, 8, (where&3)*8), PCICFG_DATA);
 		break;
 	case 2:
 		writel((readl(PCICFG_DATA) & ~FMASK(16, (where&2)*8))
 			| FIELD(value, 16, (where&2)*8), PCICFG_DATA);
 		break;
 	case 4:
 		writel(value, PCICFG_DATA);
 		break;
 	}
 	return PCIBIOS_SUCCESSFUL;
 }

 struct pci_ops pci_puv3_ops = {
 	.read  = puv3_read_config,
 	.write = puv3_write_config,
 };

 void pci_puv3_preinit(void)
 {
 	printk(KERN_DEBUG "PCI: PKUnity PCI Controller Initializing ...\n");
 	/* config PCI bridge base */
 	writel(io_v2p(PKUNITY_PCIBRI_BASE), PCICFG_BRIBASE);

 	writel(0, PCIBRI_AHBCTL0);
 	writel(io_v2p(PKUNITY_PCIBRI_BASE) | PCIBRI_BARx_MEM, PCIBRI_AHBBAR0);
 	writel(0xFFFF0000, PCIBRI_AHBAMR0);
 	writel(0, PCIBRI_AHBTAR0);

 	writel(PCIBRI_CTLx_AT, PCIBRI_AHBCTL1);
 	writel(io_v2p(PKUNITY_PCILIO_BASE) | PCIBRI_BARx_IO, PCIBRI_AHBBAR1);
 	writel(0xFFFF0000, PCIBRI_AHBAMR1);
 	writel(0x00000000, PCIBRI_AHBTAR1);

 	writel(PCIBRI_CTLx_PREF, PCIBRI_AHBCTL2);
 	writel(io_v2p(PKUNITY_PCIMEM_BASE) | PCIBRI_BARx_MEM, PCIBRI_AHBBAR2);
 	writel(0xF8000000, PCIBRI_AHBAMR2);
 	writel(0, PCIBRI_AHBTAR2);

 	writel(io_v2p(PKUNITY_PCIAHB_BASE) | PCIBRI_BARx_MEM, PCIBRI_BAR1);

 	writel(PCIBRI_CTLx_AT | PCIBRI_CTLx_PREF, PCIBRI_PCICTL0);
 	writel(io_v2p(PKUNITY_PCIAHB_BASE) | PCIBRI_BARx_MEM, PCIBRI_PCIBAR0);
 	writel(0xF8000000, PCIBRI_PCIAMR0);
 	writel(PKUNITY_SDRAM_BASE, PCIBRI_PCITAR0);

 	writel(readl(PCIBRI_CMD) | PCIBRI_CMD_IO | PCIBRI_CMD_MEM, PCIBRI_CMD);
 }

 static int __init pci_puv3_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 {
 	if (dev->bus->number == 0) {
 #ifdef CONFIG_ARCH_FPGA /* 4 pci slots */
 		if      (dev->devfn == 0x00)
 			return IRQ_PCIINTA;
 		else if (dev->devfn == 0x08)
 			return IRQ_PCIINTB;
 		else if (dev->devfn == 0x10)
 			return IRQ_PCIINTC;
 		else if (dev->devfn == 0x18)
 			return IRQ_PCIINTD;
 #endif
 #ifdef CONFIG_PUV3_DB0913 /* 3 pci slots */
 		if      (dev->devfn == 0x30)
 			return IRQ_PCIINTB;
 		else if (dev->devfn == 0x60)
 			return IRQ_PCIINTC;
 		else if (dev->devfn == 0x58)
 			return IRQ_PCIINTD;
 #endif
 #if	defined(CONFIG_PUV3_NB0916) || defined(CONFIG_PUV3_SMW0919)
 		/* only support 2 pci devices */
 		if      (dev->devfn == 0x00)
 			return IRQ_PCIINTC; /* sata */
 #endif
 	}
 	return -1;
 }

 /*
  * Only first 128MB of memory can be accessed via PCI.
  * We use GFP_DMA to allocate safe buffers to do map/unmap.
  * This is really ugly and we need a better way of specifying
  * DMA-capable regions of memory.
  */
 void __init puv3_pci_adjust_zones(unsigned long *zone_size,
 	unsigned long *zhole_size)
 {
 	unsigned int sz = SZ_128M >> PAGE_SHIFT;

 	/*
 	 * Only adjust if > 128M on current system
 	 */
 	if (zone_size[0] <= sz)
 		return;

 	zone_size[1] = zone_size[0] - sz;
 	zone_size[0] = sz;
 	zhole_size[1] = zhole_size[0];
 	zhole_size[0] = 0;
 }

 void __devinit pcibios_update_irq(struct pci_dev *dev, int irq)
 {
 	if (debug_pci)
 		printk(KERN_DEBUG "PCI: Assigning IRQ %02d to %s\n",
 				irq, pci_name(dev));
 	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
 }

 /*
  * If the bus contains any of these devices, then we must not turn on
  * parity checking of any kind.
  */
 static inline int pdev_bad_for_parity(struct pci_dev *dev)
 {
 	return 0;
 }

 /*
  * pcibios_fixup_bus - Called after each bus is probed,
  * but before its children are examined.
  */
 void __devinit pcibios_fixup_bus(struct pci_bus *bus)
 {
 	struct pci_dev *dev;
 	u16 features = PCI_COMMAND_SERR
 		| PCI_COMMAND_PARITY
 		| PCI_COMMAND_FAST_BACK;

 	bus->resource[0] = &ioport_resource;
 	bus->resource[1] = &iomem_resource;

 	/*
 	 * Walk the devices on this bus, working out what we can
 	 * and can't support.
 	 */
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		u16 status;

 		pci_read_config_word(dev, PCI_STATUS, &status);

 		/*
 		 * If any device on this bus does not support fast back
 		 * to back transfers, then the bus as a whole is not able
 		 * to support them.  Having fast back to back transfers
 		 * on saves us one PCI cycle per transaction.
 		 */
 		if (!(status & PCI_STATUS_FAST_BACK))
 			features &= ~PCI_COMMAND_FAST_BACK;

 		if (pdev_bad_for_parity(dev))
 			features &= ~(PCI_COMMAND_SERR
 					| PCI_COMMAND_PARITY);

 		switch (dev->class >> 8) {
 		case PCI_CLASS_BRIDGE_PCI:
 			pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &status);
 			status |= PCI_BRIDGE_CTL_PARITY
 				| PCI_BRIDGE_CTL_MASTER_ABORT;
 			status &= ~(PCI_BRIDGE_CTL_BUS_RESET
 				| PCI_BRIDGE_CTL_FAST_BACK);
 			pci_write_config_word(dev, PCI_BRIDGE_CONTROL, status);
 			break;

 		case PCI_CLASS_BRIDGE_CARDBUS:
 			pci_read_config_word(dev, PCI_CB_BRIDGE_CONTROL,
 					&status);
 			status |= PCI_CB_BRIDGE_CTL_PARITY
 				| PCI_CB_BRIDGE_CTL_MASTER_ABORT;
 			pci_write_config_word(dev, PCI_CB_BRIDGE_CONTROL,
 					status);
 			break;
 		}
 	}

 	/*
 	 * Now walk the devices again, this time setting them up.
 	 */
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		u16 cmd;

 		pci_read_config_word(dev, PCI_COMMAND, &cmd);
 		cmd |= features;
 		pci_write_config_word(dev, PCI_COMMAND, cmd);

 		pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
 				      L1_CACHE_BYTES >> 2);
 	}

 	/*
 	 * Propagate the flags to the PCI bridge.
 	 */
 	if (bus->self && bus->self->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
 		if (features & PCI_COMMAND_FAST_BACK)
 			bus->bridge_ctl |= PCI_BRIDGE_CTL_FAST_BACK;
 		if (features & PCI_COMMAND_PARITY)
 			bus->bridge_ctl |= PCI_BRIDGE_CTL_PARITY;
 	}

 	/*
 	 * Report what we did for this bus
 	 */
 	printk(KERN_INFO "PCI: bus%d: Fast back to back transfers %sabled\n",
 		bus->number, (features & PCI_COMMAND_FAST_BACK) ? "en" : "dis");
 }
 #ifdef CONFIG_HOTPLUG
 EXPORT_SYMBOL(pcibios_fixup_bus);
 #endif

 static int __init pci_common_init(void)
 {
 	struct pci_bus *puv3_bus;

 	pci_puv3_preinit();

 	puv3_bus = pci_scan_bus(0, &pci_puv3_ops, NULL);

 	if (!puv3_bus)
 		panic("PCI: unable to scan bus!");

 	pci_fixup_irqs(pci_common_swizzle, pci_puv3_map_irq);

 	if (!use_firmware) {
 		/*
 		 * Size the bridge windows.
 		 */
 		pci_bus_size_bridges(puv3_bus);

 		/*
 		 * Assign resources.
 		 */
 		pci_bus_assign_resources(puv3_bus);
 	}

 	/*
 	 * Tell drivers about devices found.
 	 */
 	pci_bus_add_devices(puv3_bus);

 	return 0;
 }
 subsys_initcall(pci_common_init);

 char * __devinit pcibios_setup(char *str)
 {
 	if (!strcmp(str, "debug")) {
 		debug_pci = 1;
 		return NULL;
 	} else if (!strcmp(str, "firmware")) {
 		use_firmware = 1;
 		return NULL;
 	}
 	return str;
 }

 /*
  * From arch/i386/kernel/pci-i386.c:
  *
  * We need to avoid collisions with `mirrored' VGA ports
  * and other strange ISA hardware, so we always want the
  * addresses to be allocated in the 0x000-0x0ff region
  * modulo 0x400.
  *
  * Why? Because some silly external IO cards only decode
  * the low 10 bits of the IO address. The 0x00-0xff region
  * is reserved for motherboard devices that decode all 16
  * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
  * but we want to try to avoid allocating at 0x2900-0x2bff
  * which might be mirrored at 0x0100-0x03ff..
  */
 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 				resource_size_t size, resource_size_t align)
 {
 	resource_size_t start = res->start;

 	if (res->flags & IORESOURCE_IO && start & 0x300)
 		start = (start + 0x3ff) & ~0x3ff;

 	start = (start + align - 1) & ~(align - 1);

 	return start;
 }

 /**
  * pcibios_enable_device - Enable I/O and memory.
  * @dev: PCI device to be enabled
  */
 int pcibios_enable_device(struct pci_dev *dev, int mask)
 {
 	u16 cmd, old_cmd;
 	int idx;
 	struct resource *r;

 	pci_read_config_word(dev, PCI_COMMAND, &cmd);
 	old_cmd = cmd;
 	for (idx = 0; idx < 6; idx++) {
 		/* Only set up the requested stuff */
 		if (!(mask & (1 << idx)))
 			continue;

 		r = dev->resource + idx;
 		if (!r->start && r->end) {
 			printk(KERN_ERR "PCI: Device %s not available because"
 			       " of resource collisions\n", pci_name(dev));
 			return -EINVAL;
 		}
 		if (r->flags & IORESOURCE_IO)
 			cmd |= PCI_COMMAND_IO;
 		if (r->flags & IORESOURCE_MEM)
 			cmd |= PCI_COMMAND_MEMORY;
 	}

 	/*
 	 * Bridges (eg, cardbus bridges) need to be fully enabled
 	 */
 	if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE)
 		cmd |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY;

 	if (cmd != old_cmd) {
 		printk("PCI: enabling device %s (%04x -> %04x)\n",
 		       pci_name(dev), old_cmd, cmd);
 		pci_write_config_word(dev, PCI_COMMAND, cmd);
 	}
 	return 0;
 }

 int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
 			enum pci_mmap_state mmap_state, int write_combine)
 {
 	unsigned long phys;

 	if (mmap_state == pci_mmap_io)
 		return -EINVAL;

 	phys = vma->vm_pgoff;

 	/*
 	 * Mark this as IO
 	 */
 	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

 	if (remap_pfn_range(vma, vma->vm_start, phys,
 			     vma->vm_end - vma->vm_start,
 			     vma->vm_page_prot))
 		return -EAGAIN;

 	return 0;
 }
	/*
	* linux/arch/unicore32/kernel/pci.c
	*
	* Code specific to PKUnity SoC and UniCore ISA
	*
	* Copyright (C) 2001-2010 GUAN Xue-tao
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	* PCI bios-type initialisation for PCI machines
	*
	*/
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/interrupt.h>
	#include <linux/pci.h>
	#include <linux/slab.h>
	#include <linux/init.h>
	#include <linux/io.h>

	static int debug_pci;
	static int use_firmware;

	#define CONFIG_CMD(bus, devfn, where) \
	(0x80000000 \| (bus->number << 16) \| (devfn << 8) \| (where & ~3))

	static int
	puv3_read_config(struct pci_bus *bus, unsigned int devfn, int where,
	int size, u32 *value)
	{
	writel(CONFIG_CMD(bus, devfn, where), PCICFG_ADDR);
	switch (size) {
	case 1:
	value = (readl(PCICFG_DATA) >> ((where & 3) 8)) & 0xFF;
	break;
	case 2:
	value = (readl(PCICFG_DATA) >> ((where & 2) 8)) & 0xFFFF;
	break;
	case 4:
	*value = readl(PCICFG_DATA);
	break;
	}
	return PCIBIOS_SUCCESSFUL;
	}

	static int
	puv3_write_config(struct pci_bus *bus, unsigned int devfn, int where,
	int size, u32 value)
	{
	writel(CONFIG_CMD(bus, devfn, where), PCICFG_ADDR);
	switch (size) {
	case 1:
	writel((readl(PCICFG_DATA) & ~FMASK(8, (where&3)*8))
	\| FIELD(value, 8, (where&3)*8), PCICFG_DATA);
	break;
	case 2:
	writel((readl(PCICFG_DATA) & ~FMASK(16, (where&2)*8))
	\| FIELD(value, 16, (where&2)*8), PCICFG_DATA);
	break;
	case 4:
	writel(value, PCICFG_DATA);
	break;
	}
	return PCIBIOS_SUCCESSFUL;
	}

	struct pci_ops pci_puv3_ops = {
	.read = puv3_read_config,
	.write = puv3_write_config,
	};

	void pci_puv3_preinit(void)
	{
	printk(KERN_DEBUG "PCI: PKUnity PCI Controller Initializing ...\n");
	/* config PCI bridge base */
	writel(io_v2p(PKUNITY_PCIBRI_BASE), PCICFG_BRIBASE);

	writel(0, PCIBRI_AHBCTL0);
	writel(io_v2p(PKUNITY_PCIBRI_BASE) \| PCIBRI_BARx_MEM, PCIBRI_AHBBAR0);
	writel(0xFFFF0000, PCIBRI_AHBAMR0);
	writel(0, PCIBRI_AHBTAR0);

	writel(PCIBRI_CTLx_AT, PCIBRI_AHBCTL1);
	writel(io_v2p(PKUNITY_PCILIO_BASE) \| PCIBRI_BARx_IO, PCIBRI_AHBBAR1);
	writel(0xFFFF0000, PCIBRI_AHBAMR1);
	writel(0x00000000, PCIBRI_AHBTAR1);

	writel(PCIBRI_CTLx_PREF, PCIBRI_AHBCTL2);
	writel(io_v2p(PKUNITY_PCIMEM_BASE) \| PCIBRI_BARx_MEM, PCIBRI_AHBBAR2);
	writel(0xF8000000, PCIBRI_AHBAMR2);
	writel(0, PCIBRI_AHBTAR2);

	writel(io_v2p(PKUNITY_PCIAHB_BASE) \| PCIBRI_BARx_MEM, PCIBRI_BAR1);

	writel(PCIBRI_CTLx_AT \| PCIBRI_CTLx_PREF, PCIBRI_PCICTL0);
	writel(io_v2p(PKUNITY_PCIAHB_BASE) \| PCIBRI_BARx_MEM, PCIBRI_PCIBAR0);
	writel(0xF8000000, PCIBRI_PCIAMR0);
	writel(PKUNITY_SDRAM_BASE, PCIBRI_PCITAR0);

	writel(readl(PCIBRI_CMD) \| PCIBRI_CMD_IO \| PCIBRI_CMD_MEM, PCIBRI_CMD);
	}

	static int __init pci_puv3_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
	{
	if (dev->bus->number == 0) {
	#ifdef CONFIG_ARCH_FPGA /* 4 pci slots */
	if (dev->devfn == 0x00)
	return IRQ_PCIINTA;
	else if (dev->devfn == 0x08)
	return IRQ_PCIINTB;
	else if (dev->devfn == 0x10)
	return IRQ_PCIINTC;
	else if (dev->devfn == 0x18)
	return IRQ_PCIINTD;
	#endif
	#ifdef CONFIG_PUV3_DB0913 /* 3 pci slots */
	if (dev->devfn == 0x30)
	return IRQ_PCIINTB;
	else if (dev->devfn == 0x60)
	return IRQ_PCIINTC;
	else if (dev->devfn == 0x58)
	return IRQ_PCIINTD;
	#endif
	#if defined(CONFIG_PUV3_NB0916) \|\| defined(CONFIG_PUV3_SMW0919)
	/* only support 2 pci devices */
	if (dev->devfn == 0x00)
	return IRQ_PCIINTC; /* sata */
	#endif
	}
	return -1;
	}

	/*
	* Only first 128MB of memory can be accessed via PCI.
	* We use GFP_DMA to allocate safe buffers to do map/unmap.
	* This is really ugly and we need a better way of specifying
	* DMA-capable regions of memory.
	*/
	void __init puv3_pci_adjust_zones(unsigned long *zone_size,
	unsigned long *zhole_size)
	{
	unsigned int sz = SZ_128M >> PAGE_SHIFT;

	/*
	* Only adjust if > 128M on current system
	*/
	if (zone_size[0] <= sz)
	return;

	zone_size[1] = zone_size[0] - sz;
	zone_size[0] = sz;
	zhole_size[1] = zhole_size[0];
	zhole_size[0] = 0;
	}

	void __devinit pcibios_update_irq(struct pci_dev *dev, int irq)
	{
	if (debug_pci)
	printk(KERN_DEBUG "PCI: Assigning IRQ %02d to %s\n",
	irq, pci_name(dev));
	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
	}

	/*
	* If the bus contains any of these devices, then we must not turn on
	* parity checking of any kind.
	*/
	static inline int pdev_bad_for_parity(struct pci_dev *dev)
	{
	return 0;
	}

	/*
	* pcibios_fixup_bus - Called after each bus is probed,
	* but before its children are examined.
	*/
	void __devinit pcibios_fixup_bus(struct pci_bus *bus)
	{
	struct pci_dev *dev;
	u16 features = PCI_COMMAND_SERR
	\| PCI_COMMAND_PARITY
	\| PCI_COMMAND_FAST_BACK;

	bus->resource[0] = &ioport_resource;
	bus->resource[1] = &iomem_resource;

	/*
	* Walk the devices on this bus, working out what we can
	* and can't support.
	*/
	list_for_each_entry(dev, &bus->devices, bus_list) {
	u16 status;

	pci_read_config_word(dev, PCI_STATUS, &status);

	/*
	* If any device on this bus does not support fast back
	* to back transfers, then the bus as a whole is not able
	* to support them. Having fast back to back transfers
	* on saves us one PCI cycle per transaction.
	*/
	if (!(status & PCI_STATUS_FAST_BACK))
	features &= ~PCI_COMMAND_FAST_BACK;

	if (pdev_bad_for_parity(dev))
	features &= ~(PCI_COMMAND_SERR
	\| PCI_COMMAND_PARITY);

	switch (dev->class >> 8) {
	case PCI_CLASS_BRIDGE_PCI:
	pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &status);
	status \|= PCI_BRIDGE_CTL_PARITY
	\| PCI_BRIDGE_CTL_MASTER_ABORT;
	status &= ~(PCI_BRIDGE_CTL_BUS_RESET
	\| PCI_BRIDGE_CTL_FAST_BACK);
	pci_write_config_word(dev, PCI_BRIDGE_CONTROL, status);
	break;

	case PCI_CLASS_BRIDGE_CARDBUS:
	pci_read_config_word(dev, PCI_CB_BRIDGE_CONTROL,
	&status);
	status \|= PCI_CB_BRIDGE_CTL_PARITY
	\| PCI_CB_BRIDGE_CTL_MASTER_ABORT;
	pci_write_config_word(dev, PCI_CB_BRIDGE_CONTROL,
	status);
	break;
	}
	}

	/*
	* Now walk the devices again, this time setting them up.
	*/
	list_for_each_entry(dev, &bus->devices, bus_list) {
	u16 cmd;

	pci_read_config_word(dev, PCI_COMMAND, &cmd);
	cmd \|= features;
	pci_write_config_word(dev, PCI_COMMAND, cmd);

	pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
	L1_CACHE_BYTES >> 2);
	}

	/*
	* Propagate the flags to the PCI bridge.
	*/
	if (bus->self && bus->self->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
	if (features & PCI_COMMAND_FAST_BACK)
	bus->bridge_ctl \|= PCI_BRIDGE_CTL_FAST_BACK;
	if (features & PCI_COMMAND_PARITY)
	bus->bridge_ctl \|= PCI_BRIDGE_CTL_PARITY;
	}

	/*
	* Report what we did for this bus
	*/
	printk(KERN_INFO "PCI: bus%d: Fast back to back transfers %sabled\n",
	bus->number, (features & PCI_COMMAND_FAST_BACK) ? "en" : "dis");
	}
	#ifdef CONFIG_HOTPLUG
	EXPORT_SYMBOL(pcibios_fixup_bus);
	#endif

	static int __init pci_common_init(void)
	{
	struct pci_bus *puv3_bus;

	pci_puv3_preinit();

	puv3_bus = pci_scan_bus(0, &pci_puv3_ops, NULL);

	if (!puv3_bus)
	panic("PCI: unable to scan bus!");

	pci_fixup_irqs(pci_common_swizzle, pci_puv3_map_irq);

	if (!use_firmware) {
	/*
	* Size the bridge windows.
	*/
	pci_bus_size_bridges(puv3_bus);

	/*
	* Assign resources.
	*/
	pci_bus_assign_resources(puv3_bus);
	}

	/*
	* Tell drivers about devices found.
	*/
	pci_bus_add_devices(puv3_bus);

	return 0;
	}
	subsys_initcall(pci_common_init);

	char * __devinit pcibios_setup(char *str)
	{
	if (!strcmp(str, "debug")) {
	debug_pci = 1;
	return NULL;
	} else if (!strcmp(str, "firmware")) {
	use_firmware = 1;
	return NULL;
	}
	return str;
	}

	/*
	* From arch/i386/kernel/pci-i386.c:
	*
	* We need to avoid collisions with `mirrored' VGA ports
	* and other strange ISA hardware, so we always want the
	* addresses to be allocated in the 0x000-0x0ff region
	* modulo 0x400.
	*
	* Why? Because some silly external IO cards only decode
	* the low 10 bits of the IO address. The 0x00-0xff region
	* is reserved for motherboard devices that decode all 16
	* bits, so it's ok to allocate at, say, 0x2800-0x28ff,
	* but we want to try to avoid allocating at 0x2900-0x2bff
	* which might be mirrored at 0x0100-0x03ff..
	*/
	resource_size_t pcibios_align_resource(void data, const struct resource res,
	resource_size_t size, resource_size_t align)
	{
	resource_size_t start = res->start;

	if (res->flags & IORESOURCE_IO && start & 0x300)
	start = (start + 0x3ff) & ~0x3ff;

	start = (start + align - 1) & ~(align - 1);

	return start;
	}

	/**
	* pcibios_enable_device - Enable I/O and memory.
	* @dev: PCI device to be enabled
	*/
	int pcibios_enable_device(struct pci_dev *dev, int mask)
	{
	u16 cmd, old_cmd;
	int idx;
	struct resource *r;

	pci_read_config_word(dev, PCI_COMMAND, &cmd);
	old_cmd = cmd;
	for (idx = 0; idx < 6; idx++) {
	/* Only set up the requested stuff */
	if (!(mask & (1 << idx)))
	continue;

	r = dev->resource + idx;
	if (!r->start && r->end) {
	printk(KERN_ERR "PCI: Device %s not available because"
	" of resource collisions\n", pci_name(dev));
	return -EINVAL;
	}
	if (r->flags & IORESOURCE_IO)
	cmd \|= PCI_COMMAND_IO;
	if (r->flags & IORESOURCE_MEM)
	cmd \|= PCI_COMMAND_MEMORY;
	}

	/*
	* Bridges (eg, cardbus bridges) need to be fully enabled
	*/
	if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE)
	cmd \|= PCI_COMMAND_IO \| PCI_COMMAND_MEMORY;

	if (cmd != old_cmd) {
	printk("PCI: enabling device %s (%04x -> %04x)\n",
	pci_name(dev), old_cmd, cmd);
	pci_write_config_word(dev, PCI_COMMAND, cmd);
	}
	return 0;
	}

	int pci_mmap_page_range(struct pci_dev dev, struct vm_area_struct vma,
	enum pci_mmap_state mmap_state, int write_combine)
	{
	unsigned long phys;

	if (mmap_state == pci_mmap_io)
	return -EINVAL;

	phys = vma->vm_pgoff;

	/*
	* Mark this as IO
	*/
	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

	if (remap_pfn_range(vma, vma->vm_start, phys,
	vma->vm_end - vma->vm_start,
	vma->vm_page_prot))
	return -EAGAIN;

	return 0;
	}