arch/arm/kernel/bios32.c - nest-cam/v366/linux - Git at Google

 /*
  *  linux/arch/arm/kernel/bios32.c
  *
  *  PCI bios-type initialisation for PCI machines
  *
  *  Bits taken from various places.
  */
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/io.h>

 #include <asm/mach-types.h>
 #include <asm/mach/pci.h>

 static int debug_pci;
 static int use_firmware;

 /*
  * We can't use pci_find_device() here since we are
  * called from interrupt context.
  */
 static void pcibios_bus_report_status(struct pci_bus *bus, u_int status_mask, int warn)
 {
 	struct pci_dev *dev;

 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		u16 status;

 		/*
 		 * ignore host bridge - we handle
 		 * that separately
 		 */
 		if (dev->bus->number == 0 && dev->devfn == 0)
 			continue;

 		pci_read_config_word(dev, PCI_STATUS, &status);
 		if (status == 0xffff)
 			continue;

 		if ((status & status_mask) == 0)
 			continue;

 		/* clear the status errors */
 		pci_write_config_word(dev, PCI_STATUS, status & status_mask);

 		if (warn)
 			printk("(%s: %04X) ", pci_name(dev), status);
 	}

 	list_for_each_entry(dev, &bus->devices, bus_list)
 		if (dev->subordinate)
 			pcibios_bus_report_status(dev->subordinate, status_mask, warn);
 }

 void pcibios_report_status(u_int status_mask, int warn)
 {
 	struct list_head *l;

 	list_for_each(l, &pci_root_buses) {
 		struct pci_bus *bus = pci_bus_b(l);

 		pcibios_bus_report_status(bus, status_mask, warn);
 	}
 }

 /*
  * We don't use this to fix the device, but initialisation of it.
  * It's not the correct use for this, but it works.
  * Note that the arbiter/ISA bridge appears to be buggy, specifically in
  * the following area:
  * 1. park on CPU
  * 2. ISA bridge ping-pong
  * 3. ISA bridge master handling of target RETRY
  *
  * Bug 3 is responsible for the sound DMA grinding to a halt.  We now
  * live with bug 2.
  */
 static void __devinit pci_fixup_83c553(struct pci_dev *dev)
 {
 	/*
 	 * Set memory region to start at address 0, and enable IO
 	 */
 	pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, PCI_BASE_ADDRESS_SPACE_MEMORY);
 	pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_IO);

 	dev->resource[0].end -= dev->resource[0].start;
 	dev->resource[0].start = 0;

 	/*
 	 * All memory requests from ISA to be channelled to PCI
 	 */
 	pci_write_config_byte(dev, 0x48, 0xff);

 	/*
 	 * Enable ping-pong on bus master to ISA bridge transactions.
 	 * This improves the sound DMA substantially.  The fixed
 	 * priority arbiter also helps (see below).
 	 */
 	pci_write_config_byte(dev, 0x42, 0x01);

 	/*
 	 * Enable PCI retry
 	 */
 	pci_write_config_byte(dev, 0x40, 0x22);

 	/*
 	 * We used to set the arbiter to "park on last master" (bit
 	 * 1 set), but unfortunately the CyberPro does not park the
 	 * bus.  We must therefore park on CPU.  Unfortunately, this
 	 * may trigger yet another bug in the 553.
 	 */
 	pci_write_config_byte(dev, 0x83, 0x02);

 	/*
 	 * Make the ISA DMA request lowest priority, and disable
 	 * rotating priorities completely.
 	 */
 	pci_write_config_byte(dev, 0x80, 0x11);
 	pci_write_config_byte(dev, 0x81, 0x00);

 	/*
 	 * Route INTA input to IRQ 11, and set IRQ11 to be level
 	 * sensitive.
 	 */
 	pci_write_config_word(dev, 0x44, 0xb000);
 	outb(0x08, 0x4d1);
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_83C553, pci_fixup_83c553);

 static void __devinit pci_fixup_unassign(struct pci_dev *dev)
 {
 	dev->resource[0].end -= dev->resource[0].start;
 	dev->resource[0].start = 0;
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND2, PCI_DEVICE_ID_WINBOND2_89C940F, pci_fixup_unassign);

 /*
  * Prevent the PCI layer from seeing the resources allocated to this device
  * if it is the host bridge by marking it as such.  These resources are of
  * no consequence to the PCI layer (they are handled elsewhere).
  */
 static void __devinit pci_fixup_dec21285(struct pci_dev *dev)
 {
 	int i;

 	if (dev->devfn == 0) {
 		dev->class &= 0xff;
 		dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
 		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 			dev->resource[i].start = 0;
 			dev->resource[i].end   = 0;
 			dev->resource[i].flags = 0;
 		}
 	}
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21285, pci_fixup_dec21285);

 /*
  * Same as above. The PrPMC800 carrier board for the PrPMC1100
  * card maps the host-bridge @ 00:01:00 for some reason and it
  * ends up getting scanned. Note that we only want to do this
  * fixup when we find the IXP4xx on a PrPMC system, which is why
  * we check the machine type. We could be running on a board
  * with an IXP4xx target device and we don't want to kill the
  * resources in that case.
  */
 static void __devinit pci_fixup_prpmc1100(struct pci_dev *dev)
 {
 	int i;

 	if (machine_is_prpmc1100()) {
 		dev->class &= 0xff;
 		dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
 		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 			dev->resource[i].start = 0;
 			dev->resource[i].end   = 0;
 			dev->resource[i].flags = 0;
 		}
 	}
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IXP4XX, pci_fixup_prpmc1100);

 /*
  * PCI IDE controllers use non-standard I/O port decoding, respect it.
  */
 static void __devinit pci_fixup_ide_bases(struct pci_dev *dev)
 {
 	struct resource *r;
 	int i;

 	if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)
 		return;

 	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 		r = dev->resource + i;
 		if ((r->start & ~0x80) == 0x374) {
 			r->start |= 2;
 			r->end = r->start;
 		}
 	}
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);

 /*
  * Put the DEC21142 to sleep
  */
 static void __devinit pci_fixup_dec21142(struct pci_dev *dev)
 {
 	pci_write_config_dword(dev, 0x40, 0x80000000);
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21142, pci_fixup_dec21142);

 /*
  * The CY82C693 needs some rather major fixups to ensure that it does
  * the right thing.  Idea from the Alpha people, with a few additions.
  *
  * We ensure that the IDE base registers are set to 1f0/3f4 for the
  * primary bus, and 170/374 for the secondary bus.  Also, hide them
  * from the PCI subsystem view as well so we won't try to perform
  * our own auto-configuration on them.
  *
  * In addition, we ensure that the PCI IDE interrupts are routed to
  * IRQ 14 and IRQ 15 respectively.
  *
  * The above gets us to a point where the IDE on this device is
  * functional.  However, The CY82C693U _does not work_ in bus
  * master mode without locking the PCI bus solid.
  */
 static void __devinit pci_fixup_cy82c693(struct pci_dev *dev)
 {
 	if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE) {
 		u32 base0, base1;

 		if (dev->class & 0x80) {	/* primary */
 			base0 = 0x1f0;
 			base1 = 0x3f4;
 		} else {			/* secondary */
 			base0 = 0x170;
 			base1 = 0x374;
 		}

 		pci_write_config_dword(dev, PCI_BASE_ADDRESS_0,
 				       base0 | PCI_BASE_ADDRESS_SPACE_IO);
 		pci_write_config_dword(dev, PCI_BASE_ADDRESS_1,
 				       base1 | PCI_BASE_ADDRESS_SPACE_IO);

 		dev->resource[0].start = 0;
 		dev->resource[0].end   = 0;
 		dev->resource[0].flags = 0;

 		dev->resource[1].start = 0;
 		dev->resource[1].end   = 0;
 		dev->resource[1].flags = 0;
 	} else if (PCI_FUNC(dev->devfn) == 0) {
 		/*
 		 * Setup IDE IRQ routing.
 		 */
 		pci_write_config_byte(dev, 0x4b, 14);
 		pci_write_config_byte(dev, 0x4c, 15);

 		/*
 		 * Disable FREQACK handshake, enable USB.
 		 */
 		pci_write_config_byte(dev, 0x4d, 0x41);

 		/*
 		 * Enable PCI retry, and PCI post-write buffer.
 		 */
 		pci_write_config_byte(dev, 0x44, 0x17);

 		/*
 		 * Enable ISA master and DMA post write buffering.
 		 */
 		pci_write_config_byte(dev, 0x45, 0x03);
 	}
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693, pci_fixup_cy82c693);

 static void __init pci_fixup_it8152(struct pci_dev *dev)
 {
 	int i;
 	/* fixup for ITE 8152 devices */
 	/* FIXME: add defines for class 0x68000 and 0x80103 */
 	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST ||
 	    dev->class == 0x68000 ||
 	    dev->class == 0x80103) {
 		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 			dev->resource[i].start = 0;
 			dev->resource[i].end   = 0;
 			dev->resource[i].flags = 0;
 		}
 	}
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ITE, PCI_DEVICE_ID_ITE_8152, pci_fixup_it8152);


 void __devinit pcibios_update_irq(struct pci_dev *dev, int irq)
 {
 	if (debug_pci)
 		printk("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.  Currently this is CyberPro 20x0 only.
  */
 static inline int pdev_bad_for_parity(struct pci_dev *dev)
 {
 	return ((dev->vendor == PCI_VENDOR_ID_INTERG &&
 		 (dev->device == PCI_DEVICE_ID_INTERG_2000 ||
 		  dev->device == PCI_DEVICE_ID_INTERG_2010)) ||
 		(dev->vendor == PCI_VENDOR_ID_ITE &&
 		 dev->device == PCI_DEVICE_ID_ITE_8152));

 }

 /*
  * Adjust the device resources from bus-centric to Linux-centric.
  */
 static void __devinit
 pdev_fixup_device_resources(struct pci_sys_data *root, struct pci_dev *dev)
 {
 	resource_size_t offset;
 	int i;

 	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 		if (dev->resource[i].start == 0)
 			continue;
 		if (dev->resource[i].flags & IORESOURCE_MEM)
 			offset = root->mem_offset;
 		else
 			offset = root->io_offset;

 		dev->resource[i].start += offset;
 		dev->resource[i].end   += offset;
 	}
 }

 static void __devinit
 pbus_assign_bus_resources(struct pci_bus *bus, struct pci_sys_data *root)
 {
 	struct pci_dev *dev = bus->self;
 	int i;

 	if (!dev) {
 		/*
 		 * Assign root bus resources.
 		 */
 		for (i = 0; i < 3; i++)
 			bus->resource[i] = root->resource[i];
 	}
 }

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

 	pbus_assign_bus_resources(bus, root);

 	/*
 	 * 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;

 		pdev_fixup_device_resources(root, dev);

 		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");
 }

 /*
  * Convert from Linux-centric to bus-centric addresses for bridge devices.
  */
 void
 pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
 			 struct resource *res)
 {
 	struct pci_sys_data *root = dev->sysdata;
 	unsigned long offset = 0;

 	if (res->flags & IORESOURCE_IO)
 		offset = root->io_offset;
 	if (res->flags & IORESOURCE_MEM)
 		offset = root->mem_offset;

 	region->start = res->start - offset;
 	region->end   = res->end - offset;
 }

 void __devinit
 pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
 			struct pci_bus_region *region)
 {
 	struct pci_sys_data *root = dev->sysdata;
 	unsigned long offset = 0;

 	if (res->flags & IORESOURCE_IO)
 		offset = root->io_offset;
 	if (res->flags & IORESOURCE_MEM)
 		offset = root->mem_offset;

 	res->start = region->start + offset;
 	res->end   = region->end + offset;
 }

 #ifdef CONFIG_HOTPLUG
 EXPORT_SYMBOL(pcibios_fixup_bus);
 EXPORT_SYMBOL(pcibios_resource_to_bus);
 EXPORT_SYMBOL(pcibios_bus_to_resource);
 #endif

 /*
  * Swizzle the device pin each time we cross a bridge.
  * This might update pin and returns the slot number.
  */
 static u8 __devinit pcibios_swizzle(struct pci_dev *dev, u8 *pin)
 {
 	struct pci_sys_data *sys = dev->sysdata;
 	int slot = 0, oldpin = *pin;

 	if (sys->swizzle)
 		slot = sys->swizzle(dev, pin);

 	if (debug_pci)
 		printk("PCI: %s swizzling pin %d => pin %d slot %d\n",
 			pci_name(dev), oldpin, *pin, slot);

 	return slot;
 }

 /*
  * Map a slot/pin to an IRQ.
  */
 static int pcibios_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 {
 	struct pci_sys_data *sys = dev->sysdata;
 	int irq = -1;

 	if (sys->map_irq)
 		irq = sys->map_irq(dev, slot, pin);

 	if (debug_pci)
 		printk("PCI: %s mapping slot %d pin %d => irq %d\n",
 			pci_name(dev), slot, pin, irq);

 	return irq;
 }

 static void __init pcibios_init_hw(struct hw_pci *hw)
 {
 	struct pci_sys_data *sys = NULL;
 	int ret;
 	int nr, busnr;

 	for (nr = busnr = 0; nr < hw->nr_controllers; nr++) {
 		sys = kzalloc(sizeof(struct pci_sys_data), GFP_KERNEL);
 		if (!sys)
 			panic("PCI: unable to allocate sys data!");

 #ifdef CONFIG_PCI_DOMAINS
 		sys->domain  = hw->domain;
 #endif
 		sys->hw      = hw;
 		sys->busnr   = busnr;
 		sys->swizzle = hw->swizzle;
 		sys->map_irq = hw->map_irq;
 		sys->resource[0] = &ioport_resource;
 		sys->resource[1] = &iomem_resource;

 		ret = hw->setup(nr, sys);

 		if (ret > 0) {
 			sys->bus = hw->scan(nr, sys);

 			if (!sys->bus)
 				panic("PCI: unable to scan bus!");

 			busnr = sys->bus->subordinate + 1;

 			list_add(&sys->node, &hw->buses);
 		} else {
 			kfree(sys);
 			if (ret < 0)
 				break;
 		}
 	}
 }

 void __init pci_common_init(struct hw_pci *hw)
 {
 	struct pci_sys_data *sys;

 	INIT_LIST_HEAD(&hw->buses);

 	if (hw->preinit)
 		hw->preinit();
 	pcibios_init_hw(hw);
 	if (hw->postinit)
 		hw->postinit();

 	pci_fixup_irqs(pcibios_swizzle, pcibios_map_irq);

 	list_for_each_entry(sys, &hw->buses, node) {
 		struct pci_bus *bus = sys->bus;

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

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

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

 char * __init 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)
 {
 	struct pci_sys_data *root = dev->sysdata;
 	unsigned long phys;

 	if (mmap_state == pci_mmap_io) {
 		return -EINVAL;
 	} else {
 		phys = vma->vm_pgoff + (root->mem_offset >> PAGE_SHIFT);
 	}

 	/*
 	 * 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/arm/kernel/bios32.c
	*
	* PCI bios-type initialisation for PCI machines
	*
	* Bits taken from various places.
	*/
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/pci.h>
	#include <linux/slab.h>
	#include <linux/init.h>
	#include <linux/io.h>

	#include <asm/mach-types.h>
	#include <asm/mach/pci.h>

	static int debug_pci;
	static int use_firmware;

	/*
	* We can't use pci_find_device() here since we are
	* called from interrupt context.
	*/
	static void pcibios_bus_report_status(struct pci_bus *bus, u_int status_mask, int warn)
	{
	struct pci_dev *dev;

	list_for_each_entry(dev, &bus->devices, bus_list) {
	u16 status;

	/*
	* ignore host bridge - we handle
	* that separately
	*/
	if (dev->bus->number == 0 && dev->devfn == 0)
	continue;

	pci_read_config_word(dev, PCI_STATUS, &status);
	if (status == 0xffff)
	continue;

	if ((status & status_mask) == 0)
	continue;

	/* clear the status errors */
	pci_write_config_word(dev, PCI_STATUS, status & status_mask);

	if (warn)
	printk("(%s: %04X) ", pci_name(dev), status);
	}

	list_for_each_entry(dev, &bus->devices, bus_list)
	if (dev->subordinate)
	pcibios_bus_report_status(dev->subordinate, status_mask, warn);
	}

	void pcibios_report_status(u_int status_mask, int warn)
	{
	struct list_head *l;

	list_for_each(l, &pci_root_buses) {
	struct pci_bus *bus = pci_bus_b(l);

	pcibios_bus_report_status(bus, status_mask, warn);
	}
	}

	/*
	* We don't use this to fix the device, but initialisation of it.
	* It's not the correct use for this, but it works.
	* Note that the arbiter/ISA bridge appears to be buggy, specifically in
	* the following area:
	* 1. park on CPU
	* 2. ISA bridge ping-pong
	* 3. ISA bridge master handling of target RETRY
	*
	* Bug 3 is responsible for the sound DMA grinding to a halt. We now
	* live with bug 2.
	*/
	static void __devinit pci_fixup_83c553(struct pci_dev *dev)
	{
	/*
	* Set memory region to start at address 0, and enable IO
	*/
	pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, PCI_BASE_ADDRESS_SPACE_MEMORY);
	pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_IO);

	dev->resource[0].end -= dev->resource[0].start;
	dev->resource[0].start = 0;

	/*
	* All memory requests from ISA to be channelled to PCI
	*/
	pci_write_config_byte(dev, 0x48, 0xff);

	/*
	* Enable ping-pong on bus master to ISA bridge transactions.
	* This improves the sound DMA substantially. The fixed
	* priority arbiter also helps (see below).
	*/
	pci_write_config_byte(dev, 0x42, 0x01);

	/*
	* Enable PCI retry
	*/
	pci_write_config_byte(dev, 0x40, 0x22);

	/*
	* We used to set the arbiter to "park on last master" (bit
	* 1 set), but unfortunately the CyberPro does not park the
	* bus. We must therefore park on CPU. Unfortunately, this
	* may trigger yet another bug in the 553.
	*/
	pci_write_config_byte(dev, 0x83, 0x02);

	/*
	* Make the ISA DMA request lowest priority, and disable
	* rotating priorities completely.
	*/
	pci_write_config_byte(dev, 0x80, 0x11);
	pci_write_config_byte(dev, 0x81, 0x00);

	/*
	* Route INTA input to IRQ 11, and set IRQ11 to be level
	* sensitive.
	*/
	pci_write_config_word(dev, 0x44, 0xb000);
	outb(0x08, 0x4d1);
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_83C553, pci_fixup_83c553);

	static void __devinit pci_fixup_unassign(struct pci_dev *dev)
	{
	dev->resource[0].end -= dev->resource[0].start;
	dev->resource[0].start = 0;
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND2, PCI_DEVICE_ID_WINBOND2_89C940F, pci_fixup_unassign);

	/*
	* Prevent the PCI layer from seeing the resources allocated to this device
	* if it is the host bridge by marking it as such. These resources are of
	* no consequence to the PCI layer (they are handled elsewhere).
	*/
	static void __devinit pci_fixup_dec21285(struct pci_dev *dev)
	{
	int i;

	if (dev->devfn == 0) {
	dev->class &= 0xff;
	dev->class \|= PCI_CLASS_BRIDGE_HOST << 8;
	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
	dev->resource[i].start = 0;
	dev->resource[i].end = 0;
	dev->resource[i].flags = 0;
	}
	}
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21285, pci_fixup_dec21285);

	/*
	* Same as above. The PrPMC800 carrier board for the PrPMC1100
	* card maps the host-bridge @ 00:01:00 for some reason and it
	* ends up getting scanned. Note that we only want to do this
	* fixup when we find the IXP4xx on a PrPMC system, which is why
	* we check the machine type. We could be running on a board
	* with an IXP4xx target device and we don't want to kill the
	* resources in that case.
	*/
	static void __devinit pci_fixup_prpmc1100(struct pci_dev *dev)
	{
	int i;

	if (machine_is_prpmc1100()) {
	dev->class &= 0xff;
	dev->class \|= PCI_CLASS_BRIDGE_HOST << 8;
	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
	dev->resource[i].start = 0;
	dev->resource[i].end = 0;
	dev->resource[i].flags = 0;
	}
	}
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IXP4XX, pci_fixup_prpmc1100);

	/*
	* PCI IDE controllers use non-standard I/O port decoding, respect it.
	*/
	static void __devinit pci_fixup_ide_bases(struct pci_dev *dev)
	{
	struct resource *r;
	int i;

	if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)
	return;

	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
	r = dev->resource + i;
	if ((r->start & ~0x80) == 0x374) {
	r->start \|= 2;
	r->end = r->start;
	}
	}
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);

	/*
	* Put the DEC21142 to sleep
	*/
	static void __devinit pci_fixup_dec21142(struct pci_dev *dev)
	{
	pci_write_config_dword(dev, 0x40, 0x80000000);
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21142, pci_fixup_dec21142);

	/*
	* The CY82C693 needs some rather major fixups to ensure that it does
	* the right thing. Idea from the Alpha people, with a few additions.
	*
	* We ensure that the IDE base registers are set to 1f0/3f4 for the
	* primary bus, and 170/374 for the secondary bus. Also, hide them
	* from the PCI subsystem view as well so we won't try to perform
	* our own auto-configuration on them.
	*
	* In addition, we ensure that the PCI IDE interrupts are routed to
	* IRQ 14 and IRQ 15 respectively.
	*
	* The above gets us to a point where the IDE on this device is
	* functional. However, The CY82C693U _does not work_ in bus
	* master mode without locking the PCI bus solid.
	*/
	static void __devinit pci_fixup_cy82c693(struct pci_dev *dev)
	{
	if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE) {
	u32 base0, base1;

	if (dev->class & 0x80) { /* primary */
	base0 = 0x1f0;
	base1 = 0x3f4;
	} else { /* secondary */
	base0 = 0x170;
	base1 = 0x374;
	}

	pci_write_config_dword(dev, PCI_BASE_ADDRESS_0,
	base0 \| PCI_BASE_ADDRESS_SPACE_IO);
	pci_write_config_dword(dev, PCI_BASE_ADDRESS_1,
	base1 \| PCI_BASE_ADDRESS_SPACE_IO);

	dev->resource[0].start = 0;
	dev->resource[0].end = 0;
	dev->resource[0].flags = 0;

	dev->resource[1].start = 0;
	dev->resource[1].end = 0;
	dev->resource[1].flags = 0;
	} else if (PCI_FUNC(dev->devfn) == 0) {
	/*
	* Setup IDE IRQ routing.
	*/
	pci_write_config_byte(dev, 0x4b, 14);
	pci_write_config_byte(dev, 0x4c, 15);

	/*
	* Disable FREQACK handshake, enable USB.
	*/
	pci_write_config_byte(dev, 0x4d, 0x41);

	/*
	* Enable PCI retry, and PCI post-write buffer.
	*/
	pci_write_config_byte(dev, 0x44, 0x17);

	/*
	* Enable ISA master and DMA post write buffering.
	*/
	pci_write_config_byte(dev, 0x45, 0x03);
	}
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693, pci_fixup_cy82c693);

	static void __init pci_fixup_it8152(struct pci_dev *dev)
	{
	int i;
	/* fixup for ITE 8152 devices */
	/* FIXME: add defines for class 0x68000 and 0x80103 */
	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST \|\|
	dev->class == 0x68000 \|\|
	dev->class == 0x80103) {
	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
	dev->resource[i].start = 0;
	dev->resource[i].end = 0;
	dev->resource[i].flags = 0;
	}
	}
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ITE, PCI_DEVICE_ID_ITE_8152, pci_fixup_it8152);



	void __devinit pcibios_update_irq(struct pci_dev *dev, int irq)
	{
	if (debug_pci)
	printk("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. Currently this is CyberPro 20x0 only.
	*/
	static inline int pdev_bad_for_parity(struct pci_dev *dev)
	{
	return ((dev->vendor == PCI_VENDOR_ID_INTERG &&
	(dev->device == PCI_DEVICE_ID_INTERG_2000 \|\|
	dev->device == PCI_DEVICE_ID_INTERG_2010)) \|\|
	(dev->vendor == PCI_VENDOR_ID_ITE &&
	dev->device == PCI_DEVICE_ID_ITE_8152));

	}

	/*
	* Adjust the device resources from bus-centric to Linux-centric.
	*/
	static void __devinit
	pdev_fixup_device_resources(struct pci_sys_data root, struct pci_dev dev)
	{
	resource_size_t offset;
	int i;

	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
	if (dev->resource[i].start == 0)
	continue;
	if (dev->resource[i].flags & IORESOURCE_MEM)
	offset = root->mem_offset;
	else
	offset = root->io_offset;

	dev->resource[i].start += offset;
	dev->resource[i].end += offset;
	}
	}

	static void __devinit
	pbus_assign_bus_resources(struct pci_bus bus, struct pci_sys_data root)
	{
	struct pci_dev *dev = bus->self;
	int i;

	if (!dev) {
	/*
	* Assign root bus resources.
	*/
	for (i = 0; i < 3; i++)
	bus->resource[i] = root->resource[i];
	}
	}

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

	pbus_assign_bus_resources(bus, root);

	/*
	* 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;

	pdev_fixup_device_resources(root, dev);

	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");
	}

	/*
	* Convert from Linux-centric to bus-centric addresses for bridge devices.
	*/
	void
	pcibios_resource_to_bus(struct pci_dev dev, struct pci_bus_region region,
	struct resource *res)
	{
	struct pci_sys_data *root = dev->sysdata;
	unsigned long offset = 0;

	if (res->flags & IORESOURCE_IO)
	offset = root->io_offset;
	if (res->flags & IORESOURCE_MEM)
	offset = root->mem_offset;

	region->start = res->start - offset;
	region->end = res->end - offset;
	}

	void __devinit
	pcibios_bus_to_resource(struct pci_dev dev, struct resource res,
	struct pci_bus_region *region)
	{
	struct pci_sys_data *root = dev->sysdata;
	unsigned long offset = 0;

	if (res->flags & IORESOURCE_IO)
	offset = root->io_offset;
	if (res->flags & IORESOURCE_MEM)
	offset = root->mem_offset;

	res->start = region->start + offset;
	res->end = region->end + offset;
	}

	#ifdef CONFIG_HOTPLUG
	EXPORT_SYMBOL(pcibios_fixup_bus);
	EXPORT_SYMBOL(pcibios_resource_to_bus);
	EXPORT_SYMBOL(pcibios_bus_to_resource);
	#endif

	/*
	* Swizzle the device pin each time we cross a bridge.
	* This might update pin and returns the slot number.
	*/
	static u8 __devinit pcibios_swizzle(struct pci_dev dev, u8 pin)
	{
	struct pci_sys_data *sys = dev->sysdata;
	int slot = 0, oldpin = *pin;

	if (sys->swizzle)
	slot = sys->swizzle(dev, pin);

	if (debug_pci)
	printk("PCI: %s swizzling pin %d => pin %d slot %d\n",
	pci_name(dev), oldpin, *pin, slot);

	return slot;
	}

	/*
	* Map a slot/pin to an IRQ.
	*/
	static int pcibios_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
	{
	struct pci_sys_data *sys = dev->sysdata;
	int irq = -1;

	if (sys->map_irq)
	irq = sys->map_irq(dev, slot, pin);

	if (debug_pci)
	printk("PCI: %s mapping slot %d pin %d => irq %d\n",
	pci_name(dev), slot, pin, irq);

	return irq;
	}

	static void __init pcibios_init_hw(struct hw_pci *hw)
	{
	struct pci_sys_data *sys = NULL;
	int ret;
	int nr, busnr;

	for (nr = busnr = 0; nr < hw->nr_controllers; nr++) {
	sys = kzalloc(sizeof(struct pci_sys_data), GFP_KERNEL);
	if (!sys)
	panic("PCI: unable to allocate sys data!");

	#ifdef CONFIG_PCI_DOMAINS
	sys->domain = hw->domain;
	#endif
	sys->hw = hw;
	sys->busnr = busnr;
	sys->swizzle = hw->swizzle;
	sys->map_irq = hw->map_irq;
	sys->resource[0] = &ioport_resource;
	sys->resource[1] = &iomem_resource;

	ret = hw->setup(nr, sys);

	if (ret > 0) {
	sys->bus = hw->scan(nr, sys);

	if (!sys->bus)
	panic("PCI: unable to scan bus!");

	busnr = sys->bus->subordinate + 1;

	list_add(&sys->node, &hw->buses);
	} else {
	kfree(sys);
	if (ret < 0)
	break;
	}
	}
	}

	void __init pci_common_init(struct hw_pci *hw)
	{
	struct pci_sys_data *sys;

	INIT_LIST_HEAD(&hw->buses);

	if (hw->preinit)
	hw->preinit();
	pcibios_init_hw(hw);
	if (hw->postinit)
	hw->postinit();

	pci_fixup_irqs(pcibios_swizzle, pcibios_map_irq);

	list_for_each_entry(sys, &hw->buses, node) {
	struct pci_bus *bus = sys->bus;

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

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

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

	char * __init 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)
	{
	struct pci_sys_data *root = dev->sysdata;
	unsigned long phys;

	if (mmap_state == pci_mmap_io) {
	return -EINVAL;
	} else {
	phys = vma->vm_pgoff + (root->mem_offset >> PAGE_SHIFT);
	}

	/*
	* 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;
	}