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

 /*
  * This program is free software; you can redistribute  it and/or modify it
  * under  the terms of  the GNU General  Public License as published by the
  * Free Software Foundation;  either version 2 of the  License, or (at your
  * option) any later version.
  *
  * Copyright (C) 2003, 04 Ralf Baechle (ralf@linux-mips.org)
  */
 #include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/bootmem.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/pci.h>

 /*
  * Indicate whether we respect the PCI setup left by the firmware.
  *
  * Make this long-lived  so that we know when shutting down
  * whether we probed only or not.
  */
 int pci_probe_only;

 #define PCI_ASSIGN_ALL_BUSSES	1

 unsigned int pci_probe = PCI_ASSIGN_ALL_BUSSES;

 /*
  * The PCI controller list.
  */

 struct pci_controller *hose_head, **hose_tail = &hose_head;
 struct pci_controller *pci_isa_hose;

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

 /*
  * 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 have be mirrored at 0x0100-0x03ff..
  */
 void
 pcibios_align_resource(void *data, struct resource *res,
 		       resource_size_t size, resource_size_t align)
 {
 	struct pci_dev *dev = data;
 	struct pci_controller *hose = dev->sysdata;
 	resource_size_t start = res->start;

 	if (res->flags & IORESOURCE_IO) {
 		/* Make sure we start at our min on all hoses */
 		if (start < PCIBIOS_MIN_IO + hose->io_resource->start)
 			start = PCIBIOS_MIN_IO + hose->io_resource->start;

 		/*
 		 * Put everything into 0x00-0xff region modulo 0x400
 		 */
 		if (start & 0x300)
 			start = (start + 0x3ff) & ~0x3ff;
 	} else if (res->flags & IORESOURCE_MEM) {
 		/* Make sure we start at our min on all hoses */
 		if (start < PCIBIOS_MIN_MEM + hose->mem_resource->start)
 			start = PCIBIOS_MIN_MEM + hose->mem_resource->start;
 	}

 	res->start = start;
 }

 void __init register_pci_controller(struct pci_controller *hose)
 {
 	*hose_tail = hose;
 	hose_tail = &hose->next;
 }

 /* Most MIPS systems have straight-forward swizzling needs.  */

 static inline u8 bridge_swizzle(u8 pin, u8 slot)
 {
 	return (((pin - 1) + slot) % 4) + 1;
 }

 static u8 __init common_swizzle(struct pci_dev *dev, u8 *pinp)
 {
 	u8 pin = *pinp;

 	while (dev->bus->parent) {
 		pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
 		/* Move up the chain of bridges. */
 		dev = dev->bus->self;
         }
 	*pinp = pin;

 	/* The slot is the slot of the last bridge. */
 	return PCI_SLOT(dev->devfn);
 }

 static int __init pcibios_init(void)
 {
 	struct pci_controller *hose;
 	struct pci_bus *bus;
 	int next_busno;
 	int need_domain_info = 0;

 	/* Scan all of the recorded PCI controllers.  */
 	for (next_busno = 0, hose = hose_head; hose; hose = hose->next) {

 		if (request_resource(&iomem_resource, hose->mem_resource) < 0)
 			goto out;
 		if (request_resource(&ioport_resource, hose->io_resource) < 0)
 			goto out_free_mem_resource;

 		if (!hose->iommu)
 			PCI_DMA_BUS_IS_PHYS = 1;

 		if (hose->get_busno && pci_probe_only)
 			next_busno = (*hose->get_busno)();

 		bus = pci_scan_bus(next_busno, hose->pci_ops, hose);
 		hose->bus = bus;
 		hose->need_domain_info = need_domain_info;
 		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;
 				need_domain_info = 1;
 			}
 		}
 		continue;

 out_free_mem_resource:
 		release_resource(hose->mem_resource);

 out:
 		printk(KERN_WARNING
 		       "Skipping PCI bus scan due to resource conflict\n");
 	}

 	if (!pci_probe_only)
 		pci_assign_unassigned_resources();
 	pci_fixup_irqs(common_swizzle, pcibios_map_irq);

 	return 0;
 }

 subsys_initcall(pcibios_init);

 static int pcibios_enable_resources(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->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 (dev->resource[PCI_ROM_RESOURCE].start)
 		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 the latency
  *  timer as certain crappy BIOSes forget to set it properly.
  */
 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_DEBUG "PCI: Setting latency timer of device %s to %d\n",
 	       pci_name(dev), lat);
 	pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
 }

 unsigned int pcibios_assign_all_busses(void)
 {
 	return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
 }

 int pcibios_enable_device(struct pci_dev *dev, int mask)
 {
 	int err;

 	if ((err = pcibios_enable_resources(dev, mask)) < 0)
 		return err;

 	return pcibios_plat_dev_init(dev);
 }

 static void __init pcibios_fixup_device_resources(struct pci_dev *dev,
 	struct pci_bus *bus)
 {
 	/* Update device resources.  */
 	struct pci_controller *hose = (struct pci_controller *)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_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;
 	}
 }

 void __devinit pcibios_fixup_bus(struct pci_bus *bus)
 {
 	/* Propagate hose info into the subordinate devices.  */

 	struct pci_controller *hose = bus->sysdata;
 	struct list_head *ln;
 	struct pci_dev *dev = bus->self;

 	if (!dev) {
 		bus->resource[0] = hose->io_resource;
 		bus->resource[1] = hose->mem_resource;
 	} else if (pci_probe_only &&
 		   (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
 		pci_read_bridge_bases(bus);
 		pcibios_fixup_device_resources(dev, bus);
 	}

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

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

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

 void __devinit
 pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
 			 struct resource *res)
 {
 	struct pci_controller *hose = (struct pci_controller *)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_controller *hose = (struct pci_controller *)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;
 }

 #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

 char *pcibios_setup(char *str)
 {
 	return str;
 }
	/*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*
	* Copyright (C) 2003, 04 Ralf Baechle (ralf@linux-mips.org)
	*/
	#include <linux/config.h>
	#include <linux/kernel.h>
	#include <linux/mm.h>
	#include <linux/bootmem.h>
	#include <linux/init.h>
	#include <linux/types.h>
	#include <linux/pci.h>

	/*
	* Indicate whether we respect the PCI setup left by the firmware.
	*
	* Make this long-lived so that we know when shutting down
	* whether we probed only or not.
	*/
	int pci_probe_only;

	#define PCI_ASSIGN_ALL_BUSSES 1

	unsigned int pci_probe = PCI_ASSIGN_ALL_BUSSES;

	/*
	* The PCI controller list.
	*/

	struct pci_controller hose_head, *hose_tail = &hose_head;
	struct pci_controller *pci_isa_hose;

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

	/*
	* 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 have be mirrored at 0x0100-0x03ff..
	*/
	void
	pcibios_align_resource(void data, struct resource res,
	resource_size_t size, resource_size_t align)
	{
	struct pci_dev *dev = data;
	struct pci_controller *hose = dev->sysdata;
	resource_size_t start = res->start;

	if (res->flags & IORESOURCE_IO) {
	/* Make sure we start at our min on all hoses */
	if (start < PCIBIOS_MIN_IO + hose->io_resource->start)
	start = PCIBIOS_MIN_IO + hose->io_resource->start;

	/*
	* Put everything into 0x00-0xff region modulo 0x400
	*/
	if (start & 0x300)
	start = (start + 0x3ff) & ~0x3ff;
	} else if (res->flags & IORESOURCE_MEM) {
	/* Make sure we start at our min on all hoses */
	if (start < PCIBIOS_MIN_MEM + hose->mem_resource->start)
	start = PCIBIOS_MIN_MEM + hose->mem_resource->start;
	}

	res->start = start;
	}

	void __init register_pci_controller(struct pci_controller *hose)
	{
	*hose_tail = hose;
	hose_tail = &hose->next;
	}

	/* Most MIPS systems have straight-forward swizzling needs. */

	static inline u8 bridge_swizzle(u8 pin, u8 slot)
	{
	return (((pin - 1) + slot) % 4) + 1;
	}

	static u8 __init common_swizzle(struct pci_dev dev, u8 pinp)
	{
	u8 pin = *pinp;

	while (dev->bus->parent) {
	pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
	/* Move up the chain of bridges. */
	dev = dev->bus->self;
	}
	*pinp = pin;

	/* The slot is the slot of the last bridge. */
	return PCI_SLOT(dev->devfn);
	}

	static int __init pcibios_init(void)
	{
	struct pci_controller *hose;
	struct pci_bus *bus;
	int next_busno;
	int need_domain_info = 0;

	/* Scan all of the recorded PCI controllers. */
	for (next_busno = 0, hose = hose_head; hose; hose = hose->next) {

	if (request_resource(&iomem_resource, hose->mem_resource) < 0)
	goto out;
	if (request_resource(&ioport_resource, hose->io_resource) < 0)
	goto out_free_mem_resource;

	if (!hose->iommu)
	PCI_DMA_BUS_IS_PHYS = 1;

	if (hose->get_busno && pci_probe_only)
	next_busno = (*hose->get_busno)();

	bus = pci_scan_bus(next_busno, hose->pci_ops, hose);
	hose->bus = bus;
	hose->need_domain_info = need_domain_info;
	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;
	need_domain_info = 1;
	}
	}
	continue;

	out_free_mem_resource:
	release_resource(hose->mem_resource);

	out:
	printk(KERN_WARNING
	"Skipping PCI bus scan due to resource conflict\n");
	}

	if (!pci_probe_only)
	pci_assign_unassigned_resources();
	pci_fixup_irqs(common_swizzle, pcibios_map_irq);

	return 0;
	}

	subsys_initcall(pcibios_init);

	static int pcibios_enable_resources(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->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 (dev->resource[PCI_ROM_RESOURCE].start)
	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 the latency
	* timer as certain crappy BIOSes forget to set it properly.
	*/
	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_DEBUG "PCI: Setting latency timer of device %s to %d\n",
	pci_name(dev), lat);
	pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
	}

	unsigned int pcibios_assign_all_busses(void)
	{
	return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
	}

	int pcibios_enable_device(struct pci_dev *dev, int mask)
	{
	int err;

	if ((err = pcibios_enable_resources(dev, mask)) < 0)
	return err;

	return pcibios_plat_dev_init(dev);
	}

	static void __init pcibios_fixup_device_resources(struct pci_dev *dev,
	struct pci_bus *bus)
	{
	/* Update device resources. */
	struct pci_controller hose = (struct pci_controller )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_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;
	}
	}

	void __devinit pcibios_fixup_bus(struct pci_bus *bus)
	{
	/* Propagate hose info into the subordinate devices. */

	struct pci_controller *hose = bus->sysdata;
	struct list_head *ln;
	struct pci_dev *dev = bus->self;

	if (!dev) {
	bus->resource[0] = hose->io_resource;
	bus->resource[1] = hose->mem_resource;
	} else if (pci_probe_only &&
	(dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
	pci_read_bridge_bases(bus);
	pcibios_fixup_device_resources(dev, bus);
	}

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

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

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

	void __devinit
	pcibios_resource_to_bus(struct pci_dev dev, struct pci_bus_region region,
	struct resource *res)
	{
	struct pci_controller hose = (struct pci_controller )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_controller hose = (struct pci_controller )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;
	}

	#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

	char pcibios_setup(char str)
	{
	return str;
	}