arch/sh/drivers/pci/pci.c - 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>
 #include <linux/spinlock.h>
 #include <linux/export.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 pcibios_scanbus(struct pci_channel *hose)
 {
 	static int next_busno;
 	static int need_domain_info;
 	LIST_HEAD(resources);
 	struct resource *res;
 	resource_size_t offset;
 	int i;
 	struct pci_bus *bus;

 	for (i = 0; i < hose->nr_resources; i++) {
 		res = hose->resources + i;
 		offset = 0;
 		if (res->flags & IORESOURCE_IO)
 			offset = hose->io_offset;
 		else if (res->flags & IORESOURCE_MEM)
 			offset = hose->mem_offset;
 		pci_add_resource_offset(&resources, res, offset);
 	}

 	bus = pci_scan_root_bus(NULL, next_busno, hose->pci_ops, hose,
 				&resources);
 	hose->bus = bus;

 	need_domain_info = need_domain_info || hose->index;
 	hose->need_domain_info = need_domain_info;

 	if (!bus) {
 		pci_free_resource_list(&resources);
 		return;
 	}

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

 	pci_bus_size_bridges(bus);
 	pci_bus_assign_resources(bus);
 	pci_bus_add_devices(bus);
 }

 /*
  * This interrupt-safe spinlock protects all accesses to PCI
  * configuration space.
  */
 DEFINE_RAW_SPINLOCK(pci_config_lock);
 static DEFINE_MUTEX(pci_scan_mutex);

 int register_pci_controller(struct pci_channel *hose)
 {
 	int i;

 	for (i = 0; i < hose->nr_resources; i++) {
 		struct resource *res = hose->resources + i;

 		if (res->flags & IORESOURCE_IO) {
 			if (request_resource(&ioport_resource, res) < 0)
 				goto out;
 		} else {
 			if (request_resource(&iomem_resource, res) < 0)
 				goto out;
 		}
 	}

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

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

 	/*
 	 * Setup the ERR/PERR and SERR timers, if available.
 	 */
 	pcibios_enable_timers(hose);

 	/*
 	 * 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);
 	}

 	return 0;

 out:
 	for (--i; i >= 0; i--)
 		release_resource(&hose->resources[i]);

 	printk(KERN_WARNING "Skipping PCI bus scan due to resource conflict\n");
 	return -1;
 }

 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);

 /*
  *  Called after each bus is probed, but before its children
  *  are examined.
  */
 void pcibios_fixup_bus(struct pci_bus *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, const struct resource *res,
 				resource_size_t size, resource_size_t align)
 {
 	struct pci_dev *dev = data;
 	struct pci_channel *hose = dev->sysdata;
 	resource_size_t start = res->start;

 	if (res->flags & IORESOURCE_IO) {
 		if (start < PCIBIOS_MIN_IO + hose->resources[0].start)
 			start = PCIBIOS_MIN_IO + hose->resources[0].start;

 		/*
                  * Put everything into 0x00-0xff region modulo 0x400.
 		 */
 		if (start & 0x300)
 			start = (start + 0x3ff) & ~0x3ff;
 	}

 	return start;
 }

 static void __init
 pcibios_bus_report_status_early(struct pci_channel *hose,
 				int top_bus, int current_bus,
 				unsigned int status_mask, int warn)
 {
 	unsigned int pci_devfn;
 	u16 status;
 	int ret;

 	for (pci_devfn = 0; pci_devfn < 0xff; pci_devfn++) {
 		if (PCI_FUNC(pci_devfn))
 			continue;
 		ret = early_read_config_word(hose, top_bus, current_bus,
 					     pci_devfn, PCI_STATUS, &status);
 		if (ret != PCIBIOS_SUCCESSFUL)
 			continue;
 		if (status == 0xffff)
 			continue;

 		early_write_config_word(hose, top_bus, current_bus,
 					pci_devfn, PCI_STATUS,
 					status & status_mask);
 		if (warn)
 			printk("(%02x:%02x: %04X) ", current_bus,
 			       pci_devfn, status);
 	}
 }

 /*
  * We can't use pci_find_device() here since we are
  * called from interrupt context.
  */
 static void __ref
 pcibios_bus_report_status(struct pci_bus *bus, unsigned 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 __ref pcibios_report_status(unsigned int status_mask, int warn)
 {
 	struct pci_channel *hose;

 	for (hose = hose_head; hose; hose = hose->next) {
 		if (unlikely(!hose->bus))
 			pcibios_bus_report_status_early(hose, hose_head->index,
 					hose->index, status_mask, warn);
 		else
 			pcibios_bus_report_status(hose->bus, status_mask, warn);
 	}
 }

 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

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

 	if (unlikely(!chan->io_map_base)) {
 		chan->io_map_base = sh_io_port_base;

 		if (pci_domains_supported)
 			panic("To avoid data corruption io_map_base MUST be "
 			      "set with multiple PCI domains.");
 	}

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

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

 #endif /* CONFIG_GENERIC_IOMAP */

 EXPORT_SYMBOL(PCIBIOS_MIN_IO);
 EXPORT_SYMBOL(PCIBIOS_MIN_MEM);
	/*
	* 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>
	#include <linux/spinlock.h>
	#include <linux/export.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 pcibios_scanbus(struct pci_channel *hose)
	{
	static int next_busno;
	static int need_domain_info;
	LIST_HEAD(resources);
	struct resource *res;
	resource_size_t offset;
	int i;
	struct pci_bus *bus;

	for (i = 0; i < hose->nr_resources; i++) {
	res = hose->resources + i;
	offset = 0;
	if (res->flags & IORESOURCE_IO)
	offset = hose->io_offset;
	else if (res->flags & IORESOURCE_MEM)
	offset = hose->mem_offset;
	pci_add_resource_offset(&resources, res, offset);
	}

	bus = pci_scan_root_bus(NULL, next_busno, hose->pci_ops, hose,
	&resources);
	hose->bus = bus;

	need_domain_info = need_domain_info \|\| hose->index;
	hose->need_domain_info = need_domain_info;

	if (!bus) {
	pci_free_resource_list(&resources);
	return;
	}

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

	pci_bus_size_bridges(bus);
	pci_bus_assign_resources(bus);
	pci_bus_add_devices(bus);
	}

	/*
	* This interrupt-safe spinlock protects all accesses to PCI
	* configuration space.
	*/
	DEFINE_RAW_SPINLOCK(pci_config_lock);
	static DEFINE_MUTEX(pci_scan_mutex);

	int register_pci_controller(struct pci_channel *hose)
	{
	int i;

	for (i = 0; i < hose->nr_resources; i++) {
	struct resource *res = hose->resources + i;

	if (res->flags & IORESOURCE_IO) {
	if (request_resource(&ioport_resource, res) < 0)
	goto out;
	} else {
	if (request_resource(&iomem_resource, res) < 0)
	goto out;
	}
	}

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

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

	/*
	* Setup the ERR/PERR and SERR timers, if available.
	*/
	pcibios_enable_timers(hose);

	/*
	* 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);
	}

	return 0;

	out:
	for (--i; i >= 0; i--)
	release_resource(&hose->resources[i]);

	printk(KERN_WARNING "Skipping PCI bus scan due to resource conflict\n");
	return -1;
	}

	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);

	/*
	* Called after each bus is probed, but before its children
	* are examined.
	*/
	void pcibios_fixup_bus(struct pci_bus *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, const struct resource res,
	resource_size_t size, resource_size_t align)
	{
	struct pci_dev *dev = data;
	struct pci_channel *hose = dev->sysdata;
	resource_size_t start = res->start;

	if (res->flags & IORESOURCE_IO) {
	if (start < PCIBIOS_MIN_IO + hose->resources[0].start)
	start = PCIBIOS_MIN_IO + hose->resources[0].start;

	/*
	* Put everything into 0x00-0xff region modulo 0x400.
	*/
	if (start & 0x300)
	start = (start + 0x3ff) & ~0x3ff;
	}

	return start;
	}

	static void __init
	pcibios_bus_report_status_early(struct pci_channel *hose,
	int top_bus, int current_bus,
	unsigned int status_mask, int warn)
	{
	unsigned int pci_devfn;
	u16 status;
	int ret;

	for (pci_devfn = 0; pci_devfn < 0xff; pci_devfn++) {
	if (PCI_FUNC(pci_devfn))
	continue;
	ret = early_read_config_word(hose, top_bus, current_bus,
	pci_devfn, PCI_STATUS, &status);
	if (ret != PCIBIOS_SUCCESSFUL)
	continue;
	if (status == 0xffff)
	continue;

	early_write_config_word(hose, top_bus, current_bus,
	pci_devfn, PCI_STATUS,
	status & status_mask);
	if (warn)
	printk("(%02x:%02x: %04X) ", current_bus,
	pci_devfn, status);
	}
	}

	/*
	* We can't use pci_find_device() here since we are
	* called from interrupt context.
	*/
	static void __ref
	pcibios_bus_report_status(struct pci_bus *bus, unsigned 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 __ref pcibios_report_status(unsigned int status_mask, int warn)
	{
	struct pci_channel *hose;

	for (hose = hose_head; hose; hose = hose->next) {
	if (unlikely(!hose->bus))
	pcibios_bus_report_status_early(hose, hose_head->index,
	hose->index, status_mask, warn);
	else
	pcibios_bus_report_status(hose->bus, status_mask, warn);
	}
	}

	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

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

	if (unlikely(!chan->io_map_base)) {
	chan->io_map_base = sh_io_port_base;

	if (pci_domains_supported)
	panic("To avoid data corruption io_map_base MUST be "
	"set with multiple PCI domains.");
	}

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

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

	#endif /* CONFIG_GENERIC_IOMAP */

	EXPORT_SYMBOL(PCIBIOS_MIN_IO);
	EXPORT_SYMBOL(PCIBIOS_MIN_MEM);