arch/sh/drivers/pci/pci.c - maze/linux - Git at Google

 /*
  * New-style PCI core.
  *
  * Copyright (c) 2004 - 2009  Paul Mundt
  * Copyright (c) 2002  M. R. Brown
  *
  * Modelled after arch/mips/pci/pci.c:
  *  Copyright (C) 2003, 04 Ralf Baechle (ralf@linux-mips.org)
  *
  * 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.
  */
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/pci.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/dma-debug.h>
 #include <linux/io.h>
 #include <linux/mutex.h>

 unsigned long PCIBIOS_MIN_IO = 0x0000;
 unsigned long PCIBIOS_MIN_MEM = 0;

 /*
  * The PCI controller list.
  */
 static struct pci_channel *hose_head, **hose_tail = &hose_head;

 static int pci_initialized;

 static void __devinit pcibios_scanbus(struct pci_channel *hose)
 {
 	static int next_busno;
 	struct pci_bus *bus;

 	bus = pci_scan_bus(next_busno, hose->pci_ops, hose);
 	if (bus) {
 		next_busno = bus->subordinate + 1;
 		/* Don't allow 8-bit bus number overflow inside the hose -
 		   reserve some space for bridges. */
 		if (next_busno > 224)
 			next_busno = 0;

 		pci_bus_size_bridges(bus);
 		pci_bus_assign_resources(bus);
 		pci_enable_bridges(bus);
 	}
 }

 static DEFINE_MUTEX(pci_scan_mutex);

 void __devinit register_pci_controller(struct pci_channel *hose)
 {
 	request_resource(&iomem_resource, hose->mem_resource);
 	request_resource(&ioport_resource, hose->io_resource);

 	*hose_tail = hose;
 	hose_tail = &hose->next;

 	/*
 	 * Do not panic here but later - this might hapen before console init.
 	 */
 	if (!hose->io_map_base) {
 		printk(KERN_WARNING
 		       "registering PCI controller with io_map_base unset\n");
 	}

 	/*
 	 * Scan the bus if it is register after the PCI subsystem
 	 * initialization.
 	 */
 	if (pci_initialized) {
 		mutex_lock(&pci_scan_mutex);
 		pcibios_scanbus(hose);
 		mutex_unlock(&pci_scan_mutex);
 	}
 }

 static int __init pcibios_init(void)
 {
 	struct pci_channel *hose;

 	/* Scan all of the recorded PCI controllers.  */
 	for (hose = hose_head; hose; hose = hose->next)
 		pcibios_scanbus(hose);

 	pci_fixup_irqs(pci_common_swizzle, pcibios_map_platform_irq);

 	dma_debug_add_bus(&pci_bus_type);

 	pci_initialized = 1;

 	return 0;
 }
 subsys_initcall(pcibios_init);

 static void pcibios_fixup_device_resources(struct pci_dev *dev,
 	struct pci_bus *bus)
 {
 	/* Update device resources.  */
 	struct pci_channel *hose = bus->sysdata;
 	unsigned long offset = 0;
 	int i;

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

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

 /*
  *  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 = bus->self;
 	struct list_head *ln;
 	struct pci_channel *chan = bus->sysdata;

 	if (!dev) {
 		bus->resource[0] = chan->io_resource;
 		bus->resource[1] = chan->mem_resource;
 	}

 	for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
 		dev = pci_dev_b(ln);

 		if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
 			pcibios_fixup_device_resources(dev, bus);
 	}
 }

 /*
  * 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.
  */
 resource_size_t pcibios_align_resource(void *data, struct resource *res,
 				resource_size_t size, resource_size_t align)
 {
 	struct pci_dev *dev = data;
 	struct pci_channel *chan = dev->sysdata;
 	resource_size_t start = res->start;

 	if (res->flags & IORESOURCE_IO) {
 		if (start < PCIBIOS_MIN_IO + chan->io_resource->start)
 			start = PCIBIOS_MIN_IO + chan->io_resource->start;

 		/*
                  * Put everything into 0x00-0xff region modulo 0x400.
 		 */
 		if (start & 0x300) {
 			start = (start + 0x3ff) & ~0x3ff;
 			res->start = start;
 		}
 	} else if (res->flags & IORESOURCE_MEM) {
 		if (start < PCIBIOS_MIN_MEM + chan->mem_resource->start)
 			start = PCIBIOS_MIN_MEM + chan->mem_resource->start;
 	}

 	return start;
 }

 void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
 			 struct resource *res)
 {
 	struct pci_channel *hose = dev->sysdata;
 	unsigned long offset = 0;

 	if (res->flags & IORESOURCE_IO)
 		offset = hose->io_offset;
 	else if (res->flags & IORESOURCE_MEM)
 		offset = hose->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_channel *hose = dev->sysdata;
 	unsigned long offset = 0;

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

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

 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 < PCI_NUM_RESOURCES; idx++) {
 		/* Only set up the requested stuff */
 		if (!(mask & (1<<idx)))
 			continue;

 		r = &dev->resource[idx];
 		if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
 			continue;
 		if ((idx == PCI_ROM_RESOURCE) &&
 				(!(r->flags & IORESOURCE_ROM_ENABLE)))
 			continue;
 		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;
 	}
 	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;
 }

 /*
  *  If we set up a device for bus mastering, we need to check and set
  *  the latency timer as it may not be properly set.
  */
 static unsigned int pcibios_max_latency = 255;

 void pcibios_set_master(struct pci_dev *dev)
 {
 	u8 lat;
 	pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
 	if (lat < 16)
 		lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
 	else if (lat > pcibios_max_latency)
 		lat = pcibios_max_latency;
 	else
 		return;
 	printk(KERN_INFO "PCI: Setting latency timer of device %s to %d\n",
 	       pci_name(dev), lat);
 	pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
 }

 void __init pcibios_update_irq(struct pci_dev *dev, int irq)
 {
 	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
 }

 char * __devinit pcibios_setup(char *str)
 {
 	return str;
 }

 int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
 			enum pci_mmap_state mmap_state, int write_combine)
 {
 	/*
 	 * I/O space can be accessed via normal processor loads and stores on
 	 * this platform but for now we elect not to do this and portable
 	 * drivers should not do this anyway.
 	 */
 	if (mmap_state == pci_mmap_io)
 		return -EINVAL;

 	/*
 	 * Ignore write-combine; for now only return uncached mappings.
 	 */
 	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

 	return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
 			       vma->vm_end - vma->vm_start,
 			       vma->vm_page_prot);
 }

 #ifndef CONFIG_GENERIC_IOMAP

 static void __iomem *ioport_map_pci(struct pci_dev *dev,
 				    unsigned long port, unsigned int nr)
 {
 	struct pci_channel *chan = dev->sysdata;

 	if (!chan->io_map_base)
 		chan->io_map_base = generic_io_base;

 	return (void __iomem *)(chan->io_map_base + port);
 }

 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
 {
 	resource_size_t start = pci_resource_start(dev, bar);
 	resource_size_t len = pci_resource_len(dev, bar);
 	unsigned long flags = pci_resource_flags(dev, bar);

 	if (unlikely(!len || !start))
 		return NULL;
 	if (maxlen && len > maxlen)
 		len = maxlen;

 	if (flags & IORESOURCE_IO)
 		return ioport_map_pci(dev, start, len);

 	/*
 	 * Presently the IORESOURCE_MEM case is a bit special, most
 	 * SH7751 style PCI controllers have PCI memory at a fixed
 	 * location in the address space where no remapping is desired.
 	 * With the IORESOURCE_MEM case more care has to be taken
 	 * to inhibit page table mapping for legacy cores, but this is
 	 * punted off to __ioremap().
 	 *					-- PFM.
 	 */
 	if (flags & IORESOURCE_MEM) {
 		if (flags & IORESOURCE_CACHEABLE)
 			return ioremap(start, len);

 		return ioremap_nocache(start, len);
 	}

 	return NULL;
 }
 EXPORT_SYMBOL(pci_iomap);

 void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
 {
 	iounmap(addr);
 }
 EXPORT_SYMBOL(pci_iounmap);

 #endif /* CONFIG_GENERIC_IOMAP */

 #ifdef CONFIG_HOTPLUG
 EXPORT_SYMBOL(pcibios_resource_to_bus);
 EXPORT_SYMBOL(pcibios_bus_to_resource);
 EXPORT_SYMBOL(PCIBIOS_MIN_IO);
 EXPORT_SYMBOL(PCIBIOS_MIN_MEM);
 #endif
	/*
	* New-style PCI core.
	*
	* Copyright (c) 2004 - 2009 Paul Mundt
	* Copyright (c) 2002 M. R. Brown
	*
	* Modelled after arch/mips/pci/pci.c:
	* Copyright (C) 2003, 04 Ralf Baechle (ralf@linux-mips.org)
	*
	* 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.
	*/
	#include <linux/kernel.h>
	#include <linux/mm.h>
	#include <linux/pci.h>
	#include <linux/init.h>
	#include <linux/types.h>
	#include <linux/dma-debug.h>
	#include <linux/io.h>
	#include <linux/mutex.h>

	unsigned long PCIBIOS_MIN_IO = 0x0000;
	unsigned long PCIBIOS_MIN_MEM = 0;

	/*
	* The PCI controller list.
	*/
	static struct pci_channel hose_head, *hose_tail = &hose_head;

	static int pci_initialized;

	static void __devinit pcibios_scanbus(struct pci_channel *hose)
	{
	static int next_busno;
	struct pci_bus *bus;

	bus = pci_scan_bus(next_busno, hose->pci_ops, hose);
	if (bus) {
	next_busno = bus->subordinate + 1;
	/* Don't allow 8-bit bus number overflow inside the hose -
	reserve some space for bridges. */
	if (next_busno > 224)
	next_busno = 0;

	pci_bus_size_bridges(bus);
	pci_bus_assign_resources(bus);
	pci_enable_bridges(bus);
	}
	}

	static DEFINE_MUTEX(pci_scan_mutex);

	void __devinit register_pci_controller(struct pci_channel *hose)
	{
	request_resource(&iomem_resource, hose->mem_resource);
	request_resource(&ioport_resource, hose->io_resource);

	*hose_tail = hose;
	hose_tail = &hose->next;

	/*
	* Do not panic here but later - this might hapen before console init.
	*/
	if (!hose->io_map_base) {
	printk(KERN_WARNING
	"registering PCI controller with io_map_base unset\n");
	}

	/*
	* Scan the bus if it is register after the PCI subsystem
	* initialization.
	*/
	if (pci_initialized) {
	mutex_lock(&pci_scan_mutex);
	pcibios_scanbus(hose);
	mutex_unlock(&pci_scan_mutex);
	}
	}

	static int __init pcibios_init(void)
	{
	struct pci_channel *hose;

	/* Scan all of the recorded PCI controllers. */
	for (hose = hose_head; hose; hose = hose->next)
	pcibios_scanbus(hose);

	pci_fixup_irqs(pci_common_swizzle, pcibios_map_platform_irq);

	dma_debug_add_bus(&pci_bus_type);

	pci_initialized = 1;

	return 0;
	}
	subsys_initcall(pcibios_init);

	static void pcibios_fixup_device_resources(struct pci_dev *dev,
	struct pci_bus *bus)
	{
	/* Update device resources. */
	struct pci_channel *hose = bus->sysdata;
	unsigned long offset = 0;
	int i;

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

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

	/*
	* 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 = bus->self;
	struct list_head *ln;
	struct pci_channel *chan = bus->sysdata;

	if (!dev) {
	bus->resource[0] = chan->io_resource;
	bus->resource[1] = chan->mem_resource;
	}

	for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
	dev = pci_dev_b(ln);

	if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
	pcibios_fixup_device_resources(dev, bus);
	}
	}

	/*
	* 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.
	*/
	resource_size_t pcibios_align_resource(void data, struct resource res,
	resource_size_t size, resource_size_t align)
	{
	struct pci_dev *dev = data;
	struct pci_channel *chan = dev->sysdata;
	resource_size_t start = res->start;

	if (res->flags & IORESOURCE_IO) {
	if (start < PCIBIOS_MIN_IO + chan->io_resource->start)
	start = PCIBIOS_MIN_IO + chan->io_resource->start;

	/*
	* Put everything into 0x00-0xff region modulo 0x400.
	*/
	if (start & 0x300) {
	start = (start + 0x3ff) & ~0x3ff;
	res->start = start;
	}
	} else if (res->flags & IORESOURCE_MEM) {
	if (start < PCIBIOS_MIN_MEM + chan->mem_resource->start)
	start = PCIBIOS_MIN_MEM + chan->mem_resource->start;
	}

	return start;
	}

	void pcibios_resource_to_bus(struct pci_dev dev, struct pci_bus_region region,
	struct resource *res)
	{
	struct pci_channel *hose = dev->sysdata;
	unsigned long offset = 0;

	if (res->flags & IORESOURCE_IO)
	offset = hose->io_offset;
	else if (res->flags & IORESOURCE_MEM)
	offset = hose->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_channel *hose = dev->sysdata;
	unsigned long offset = 0;

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

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

	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 < PCI_NUM_RESOURCES; idx++) {
	/* Only set up the requested stuff */
	if (!(mask & (1<<idx)))
	continue;

	r = &dev->resource[idx];
	if (!(r->flags & (IORESOURCE_IO \| IORESOURCE_MEM)))
	continue;
	if ((idx == PCI_ROM_RESOURCE) &&
	(!(r->flags & IORESOURCE_ROM_ENABLE)))
	continue;
	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;
	}
	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;
	}

	/*
	* If we set up a device for bus mastering, we need to check and set
	* the latency timer as it may not be properly set.
	*/
	static unsigned int pcibios_max_latency = 255;

	void pcibios_set_master(struct pci_dev *dev)
	{
	u8 lat;
	pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
	if (lat < 16)
	lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
	else if (lat > pcibios_max_latency)
	lat = pcibios_max_latency;
	else
	return;
	printk(KERN_INFO "PCI: Setting latency timer of device %s to %d\n",
	pci_name(dev), lat);
	pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
	}

	void __init pcibios_update_irq(struct pci_dev *dev, int irq)
	{
	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
	}

	char * __devinit pcibios_setup(char *str)
	{
	return str;
	}

	int pci_mmap_page_range(struct pci_dev dev, struct vm_area_struct vma,
	enum pci_mmap_state mmap_state, int write_combine)
	{
	/*
	* I/O space can be accessed via normal processor loads and stores on
	* this platform but for now we elect not to do this and portable
	* drivers should not do this anyway.
	*/
	if (mmap_state == pci_mmap_io)
	return -EINVAL;

	/*
	* Ignore write-combine; for now only return uncached mappings.
	*/
	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

	return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
	vma->vm_end - vma->vm_start,
	vma->vm_page_prot);
	}

	#ifndef CONFIG_GENERIC_IOMAP

	static void __iomem ioport_map_pci(struct pci_dev dev,
	unsigned long port, unsigned int nr)
	{
	struct pci_channel *chan = dev->sysdata;

	if (!chan->io_map_base)
	chan->io_map_base = generic_io_base;

	return (void __iomem *)(chan->io_map_base + port);
	}

	void __iomem pci_iomap(struct pci_dev dev, int bar, unsigned long maxlen)
	{
	resource_size_t start = pci_resource_start(dev, bar);
	resource_size_t len = pci_resource_len(dev, bar);
	unsigned long flags = pci_resource_flags(dev, bar);

	if (unlikely(!len \|\| !start))
	return NULL;
	if (maxlen && len > maxlen)
	len = maxlen;

	if (flags & IORESOURCE_IO)
	return ioport_map_pci(dev, start, len);

	/*
	* Presently the IORESOURCE_MEM case is a bit special, most
	* SH7751 style PCI controllers have PCI memory at a fixed
	* location in the address space where no remapping is desired.
	* With the IORESOURCE_MEM case more care has to be taken
	* to inhibit page table mapping for legacy cores, but this is
	* punted off to __ioremap().
	* -- PFM.
	*/
	if (flags & IORESOURCE_MEM) {
	if (flags & IORESOURCE_CACHEABLE)
	return ioremap(start, len);

	return ioremap_nocache(start, len);
	}

	return NULL;
	}
	EXPORT_SYMBOL(pci_iomap);

	void pci_iounmap(struct pci_dev dev, void __iomem addr)
	{
	iounmap(addr);
	}
	EXPORT_SYMBOL(pci_iounmap);

	#endif /* CONFIG_GENERIC_IOMAP */

	#ifdef CONFIG_HOTPLUG
	EXPORT_SYMBOL(pcibios_resource_to_bus);
	EXPORT_SYMBOL(pcibios_bus_to_resource);
	EXPORT_SYMBOL(PCIBIOS_MIN_IO);
	EXPORT_SYMBOL(PCIBIOS_MIN_MEM);
	#endif