arch/powerpc/kernel/pci_32.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Common pmac/prep/chrp pci routines. -- Cort
  */

 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/delay.h>
 #include <linux/string.h>
 #include <linux/init.h>
 #include <linux/capability.h>
 #include <linux/sched.h>
 #include <linux/errno.h>
 #include <linux/memblock.h>
 #include <linux/syscalls.h>
 #include <linux/irq.h>
 #include <linux/list.h>
 #include <linux/of.h>
 #include <linux/slab.h>
 #include <linux/export.h>

 #include <asm/processor.h>
 #include <asm/io.h>
 #include <asm/sections.h>
 #include <asm/pci-bridge.h>
 #include <asm/ppc-pci.h>
 #include <asm/byteorder.h>
 #include <linux/uaccess.h>
 #include <asm/machdep.h>

 #undef DEBUG

 unsigned long isa_io_base     = 0;
 unsigned long pci_dram_offset = 0;
 int pcibios_assign_bus_offset = 1;
 EXPORT_SYMBOL(isa_io_base);
 EXPORT_SYMBOL(pci_dram_offset);

 static void fixup_cpc710_pci64(struct pci_dev* dev);

 /* By default, we don't re-assign bus numbers. We do this only on
  * some pmacs
  */
 static int pci_assign_all_buses;

 /* This will remain NULL for now, until isa-bridge.c is made common
  * to both 32-bit and 64-bit.
  */
 struct pci_dev *isa_bridge_pcidev;
 EXPORT_SYMBOL_GPL(isa_bridge_pcidev);

 static void
 fixup_cpc710_pci64(struct pci_dev* dev)
 {
 	/* Hide the PCI64 BARs from the kernel as their content doesn't
 	 * fit well in the resource management
 	 */
 	dev->resource[0].start = dev->resource[0].end = 0;
 	dev->resource[0].flags = 0;
 	dev->resource[1].start = dev->resource[1].end = 0;
 	dev->resource[1].flags = 0;
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM,	PCI_DEVICE_ID_IBM_CPC710_PCI64,	fixup_cpc710_pci64);

 #if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP)

 static u8* pci_to_OF_bus_map;
 static int pci_bus_count;

 /*
  * Functions below are used on OpenFirmware machines.
  */
 static void
 make_one_node_map(struct device_node* node, u8 pci_bus)
 {
 	const int *bus_range;
 	int len;

 	if (pci_bus >= pci_bus_count)
 		return;
 	bus_range = of_get_property(node, "bus-range", &len);
 	if (bus_range == NULL || len < 2 * sizeof(int)) {
 		printk(KERN_WARNING "Can't get bus-range for %pOF, "
 		       "assuming it starts at 0\n", node);
 		pci_to_OF_bus_map[pci_bus] = 0;
 	} else
 		pci_to_OF_bus_map[pci_bus] = bus_range[0];

 	for_each_child_of_node(node, node) {
 		struct pci_dev* dev;
 		const unsigned int *class_code, *reg;

 		class_code = of_get_property(node, "class-code", NULL);
 		if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
 			(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
 			continue;
 		reg = of_get_property(node, "reg", NULL);
 		if (!reg)
 			continue;
 		dev = pci_get_domain_bus_and_slot(0, pci_bus,
 						  ((reg[0] >> 8) & 0xff));
 		if (!dev || !dev->subordinate) {
 			pci_dev_put(dev);
 			continue;
 		}
 		make_one_node_map(node, dev->subordinate->number);
 		pci_dev_put(dev);
 	}
 }

 static void __init
 pcibios_make_OF_bus_map(void)
 {
 	int i;
 	struct pci_controller *hose, *tmp;
 	struct property *map_prop;
 	struct device_node *dn;

 	pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
 	if (!pci_to_OF_bus_map) {
 		printk(KERN_ERR "Can't allocate OF bus map !\n");
 		return;
 	}

 	/* We fill the bus map with invalid values, that helps
 	 * debugging.
 	 */
 	for (i=0; i<pci_bus_count; i++)
 		pci_to_OF_bus_map[i] = 0xff;

 	/* For each hose, we begin searching bridges */
 	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 		struct device_node* node = hose->dn;

 		if (!node)
 			continue;
 		make_one_node_map(node, hose->first_busno);
 	}
 	dn = of_find_node_by_path("/");
 	map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
 	if (map_prop) {
 		BUG_ON(pci_bus_count > map_prop->length);
 		memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
 	}
 	of_node_put(dn);
 #ifdef DEBUG
 	printk("PCI->OF bus map:\n");
 	for (i=0; i<pci_bus_count; i++) {
 		if (pci_to_OF_bus_map[i] == 0xff)
 			continue;
 		printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
 	}
 #endif
 }


 #ifdef CONFIG_PPC_PMAC
 /*
  * Returns the PCI device matching a given OF node
  */
 int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn)
 {
 	struct pci_dev *dev = NULL;
 	const __be32 *reg;
 	int size;

 	/* Check if it might have a chance to be a PCI device */
 	if (!pci_find_hose_for_OF_device(node))
 		return -ENODEV;

 	reg = of_get_property(node, "reg", &size);
 	if (!reg || size < 5 * sizeof(u32))
 		return -ENODEV;

 	*bus = (be32_to_cpup(&reg[0]) >> 16) & 0xff;
 	*devfn = (be32_to_cpup(&reg[0]) >> 8) & 0xff;

 	/* Ok, here we need some tweak. If we have already renumbered
 	 * all busses, we can't rely on the OF bus number any more.
 	 * the pci_to_OF_bus_map is not enough as several PCI busses
 	 * may match the same OF bus number.
 	 */
 	if (!pci_to_OF_bus_map)
 		return 0;

 	for_each_pci_dev(dev)
 		if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
 				dev->devfn == *devfn) {
 			*bus = dev->bus->number;
 			pci_dev_put(dev);
 			return 0;
 		}

 	return -ENODEV;
 }
 EXPORT_SYMBOL(pci_device_from_OF_node);
 #endif

 #ifdef CONFIG_PPC_CHRP
 /* We create the "pci-OF-bus-map" property now so it appears in the
  * /proc device tree
  */
 void __init
 pci_create_OF_bus_map(void)
 {
 	struct property* of_prop;
 	struct device_node *dn;

 	of_prop = memblock_alloc(sizeof(struct property) + 256,
 				 SMP_CACHE_BYTES);
 	if (!of_prop)
 		panic("%s: Failed to allocate %zu bytes\n", __func__,
 		      sizeof(struct property) + 256);
 	dn = of_find_node_by_path("/");
 	if (dn) {
 		memset(of_prop, -1, sizeof(struct property) + 256);
 		of_prop->name = "pci-OF-bus-map";
 		of_prop->length = 256;
 		of_prop->value = &of_prop[1];
 		of_add_property(dn, of_prop);
 		of_node_put(dn);
 	}
 }
 #endif

 #endif /* defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP) */

 void pcibios_setup_phb_io_space(struct pci_controller *hose)
 {
 	unsigned long io_offset;
 	struct resource *res = &hose->io_resource;

 	/* Fixup IO space offset */
 	io_offset = pcibios_io_space_offset(hose);
 	res->start += io_offset;
 	res->end += io_offset;
 }

 static int __init pcibios_init(void)
 {
 	struct pci_controller *hose, *tmp;
 #ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
 	int next_busno = 0;
 #endif

 	printk(KERN_INFO "PCI: Probing PCI hardware\n");

 #ifdef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
 	/*
 	 * Enable PCI domains in /proc when PCI bus numbers are not unique
 	 * across all PCI domains to prevent conflicts. And keep PCI domain 0
 	 * backward compatible in /proc for video cards.
 	 */
 	pci_add_flags(PCI_ENABLE_PROC_DOMAINS | PCI_COMPAT_DOMAIN_0);
 #endif

 	if (pci_has_flag(PCI_REASSIGN_ALL_BUS))
 		pci_assign_all_buses = 1;

 	/* Scan all of the recorded PCI controllers.  */
 	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 #ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
 		if (pci_assign_all_buses)
 			hose->first_busno = next_busno;
 #endif
 		hose->last_busno = 0xff;
 		pcibios_scan_phb(hose);
 		pci_bus_add_devices(hose->bus);
 #ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
 		if (pci_assign_all_buses || next_busno <= hose->last_busno)
 			next_busno = hose->last_busno + pcibios_assign_bus_offset;
 #endif
 	}

 #if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP)
 	pci_bus_count = next_busno;

 	/* OpenFirmware based machines need a map of OF bus
 	 * numbers vs. kernel bus numbers since we may have to
 	 * remap them.
 	 */
 	if (pci_assign_all_buses)
 		pcibios_make_OF_bus_map();
 #endif

 	/* Call common code to handle resource allocation */
 	pcibios_resource_survey();

 	/* Call machine dependent fixup */
 	if (ppc_md.pcibios_fixup)
 		ppc_md.pcibios_fixup();

 	/* Call machine dependent post-init code */
 	if (ppc_md.pcibios_after_init)
 		ppc_md.pcibios_after_init();

 	return 0;
 }

 subsys_initcall(pcibios_init);

 static struct pci_controller*
 pci_bus_to_hose(int bus)
 {
 	struct pci_controller *hose, *tmp;

 	list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
 		if (bus >= hose->first_busno && bus <= hose->last_busno)
 			return hose;
 	return NULL;
 }

 /* Provide information on locations of various I/O regions in physical
  * memory.  Do this on a per-card basis so that we choose the right
  * root bridge.
  * Note that the returned IO or memory base is a physical address
  */

 SYSCALL_DEFINE3(pciconfig_iobase, long, which,
 		unsigned long, bus, unsigned long, devfn)
 {
 	struct pci_controller* hose;
 	long result = -EOPNOTSUPP;

 	hose = pci_bus_to_hose(bus);
 	if (!hose)
 		return -ENODEV;

 	switch (which) {
 	case IOBASE_BRIDGE_NUMBER:
 		return (long)hose->first_busno;
 	case IOBASE_MEMORY:
 		return (long)hose->mem_offset[0];
 	case IOBASE_IO:
 		return (long)hose->io_base_phys;
 	case IOBASE_ISA_IO:
 		return (long)isa_io_base;
 	case IOBASE_ISA_MEM:
 		return (long)isa_mem_base;
 	}

 	return result;
 }
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Common pmac/prep/chrp pci routines. -- Cort
	*/

	#include <linux/kernel.h>
	#include <linux/pci.h>
	#include <linux/delay.h>
	#include <linux/string.h>
	#include <linux/init.h>
	#include <linux/capability.h>
	#include <linux/sched.h>
	#include <linux/errno.h>
	#include <linux/memblock.h>
	#include <linux/syscalls.h>
	#include <linux/irq.h>
	#include <linux/list.h>
	#include <linux/of.h>
	#include <linux/slab.h>
	#include <linux/export.h>

	#include <asm/processor.h>
	#include <asm/io.h>
	#include <asm/sections.h>
	#include <asm/pci-bridge.h>
	#include <asm/ppc-pci.h>
	#include <asm/byteorder.h>
	#include <linux/uaccess.h>
	#include <asm/machdep.h>

	#undef DEBUG

	unsigned long isa_io_base = 0;
	unsigned long pci_dram_offset = 0;
	int pcibios_assign_bus_offset = 1;
	EXPORT_SYMBOL(isa_io_base);
	EXPORT_SYMBOL(pci_dram_offset);

	static void fixup_cpc710_pci64(struct pci_dev* dev);

	/* By default, we don't re-assign bus numbers. We do this only on
	* some pmacs
	*/
	static int pci_assign_all_buses;

	/* This will remain NULL for now, until isa-bridge.c is made common
	* to both 32-bit and 64-bit.
	*/
	struct pci_dev *isa_bridge_pcidev;
	EXPORT_SYMBOL_GPL(isa_bridge_pcidev);

	static void
	fixup_cpc710_pci64(struct pci_dev* dev)
	{
	/* Hide the PCI64 BARs from the kernel as their content doesn't
	* fit well in the resource management
	*/
	dev->resource[0].start = dev->resource[0].end = 0;
	dev->resource[0].flags = 0;
	dev->resource[1].start = dev->resource[1].end = 0;
	dev->resource[1].flags = 0;
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64);

	#if defined(CONFIG_PPC_PMAC) \|\| defined(CONFIG_PPC_CHRP)

	static u8* pci_to_OF_bus_map;
	static int pci_bus_count;

	/*
	* Functions below are used on OpenFirmware machines.
	*/
	static void
	make_one_node_map(struct device_node* node, u8 pci_bus)
	{
	const int *bus_range;
	int len;

	if (pci_bus >= pci_bus_count)
	return;
	bus_range = of_get_property(node, "bus-range", &len);
	if (bus_range == NULL \|\| len < 2 * sizeof(int)) {
	printk(KERN_WARNING "Can't get bus-range for %pOF, "
	"assuming it starts at 0\n", node);
	pci_to_OF_bus_map[pci_bus] = 0;
	} else
	pci_to_OF_bus_map[pci_bus] = bus_range[0];

	for_each_child_of_node(node, node) {
	struct pci_dev* dev;
	const unsigned int class_code, reg;

	class_code = of_get_property(node, "class-code", NULL);
	if (!class_code \|\| ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
	(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
	continue;
	reg = of_get_property(node, "reg", NULL);
	if (!reg)
	continue;
	dev = pci_get_domain_bus_and_slot(0, pci_bus,
	((reg[0] >> 8) & 0xff));
	if (!dev \|\| !dev->subordinate) {
	pci_dev_put(dev);
	continue;
	}
	make_one_node_map(node, dev->subordinate->number);
	pci_dev_put(dev);
	}
	}

	static void __init
	pcibios_make_OF_bus_map(void)
	{
	int i;
	struct pci_controller hose, tmp;
	struct property *map_prop;
	struct device_node *dn;

	pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
	if (!pci_to_OF_bus_map) {
	printk(KERN_ERR "Can't allocate OF bus map !\n");
	return;
	}

	/* We fill the bus map with invalid values, that helps
	* debugging.
	*/
	for (i=0; i<pci_bus_count; i++)
	pci_to_OF_bus_map[i] = 0xff;

	/* For each hose, we begin searching bridges */
	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
	struct device_node* node = hose->dn;

	if (!node)
	continue;
	make_one_node_map(node, hose->first_busno);
	}
	dn = of_find_node_by_path("/");
	map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
	if (map_prop) {
	BUG_ON(pci_bus_count > map_prop->length);
	memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
	}
	of_node_put(dn);
	#ifdef DEBUG
	printk("PCI->OF bus map:\n");
	for (i=0; i<pci_bus_count; i++) {
	if (pci_to_OF_bus_map[i] == 0xff)
	continue;
	printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
	}
	#endif
	}


	#ifdef CONFIG_PPC_PMAC
	/*
	* Returns the PCI device matching a given OF node
	*/
	int pci_device_from_OF_node(struct device_node node, u8 bus, u8 *devfn)
	{
	struct pci_dev *dev = NULL;
	const __be32 *reg;
	int size;

	/* Check if it might have a chance to be a PCI device */
	if (!pci_find_hose_for_OF_device(node))
	return -ENODEV;

	reg = of_get_property(node, "reg", &size);
	if (!reg \|\| size < 5 * sizeof(u32))
	return -ENODEV;

	*bus = (be32_to_cpup(&reg[0]) >> 16) & 0xff;
	*devfn = (be32_to_cpup(&reg[0]) >> 8) & 0xff;

	/* Ok, here we need some tweak. If we have already renumbered
	* all busses, we can't rely on the OF bus number any more.
	* the pci_to_OF_bus_map is not enough as several PCI busses
	* may match the same OF bus number.
	*/
	if (!pci_to_OF_bus_map)
	return 0;

	for_each_pci_dev(dev)
	if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
	dev->devfn == *devfn) {
	*bus = dev->bus->number;
	pci_dev_put(dev);
	return 0;
	}

	return -ENODEV;
	}
	EXPORT_SYMBOL(pci_device_from_OF_node);
	#endif

	#ifdef CONFIG_PPC_CHRP
	/* We create the "pci-OF-bus-map" property now so it appears in the
	* /proc device tree
	*/
	void __init
	pci_create_OF_bus_map(void)
	{
	struct property* of_prop;
	struct device_node *dn;

	of_prop = memblock_alloc(sizeof(struct property) + 256,
	SMP_CACHE_BYTES);
	if (!of_prop)
	panic("%s: Failed to allocate %zu bytes\n", __func__,
	sizeof(struct property) + 256);
	dn = of_find_node_by_path("/");
	if (dn) {
	memset(of_prop, -1, sizeof(struct property) + 256);
	of_prop->name = "pci-OF-bus-map";
	of_prop->length = 256;
	of_prop->value = &of_prop[1];
	of_add_property(dn, of_prop);
	of_node_put(dn);
	}
	}
	#endif

	#endif /* defined(CONFIG_PPC_PMAC) \|\| defined(CONFIG_PPC_CHRP) */

	void pcibios_setup_phb_io_space(struct pci_controller *hose)
	{
	unsigned long io_offset;
	struct resource *res = &hose->io_resource;

	/* Fixup IO space offset */
	io_offset = pcibios_io_space_offset(hose);
	res->start += io_offset;
	res->end += io_offset;
	}

	static int __init pcibios_init(void)
	{
	struct pci_controller hose, tmp;
	#ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
	int next_busno = 0;
	#endif

	printk(KERN_INFO "PCI: Probing PCI hardware\n");

	#ifdef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
	/*
	* Enable PCI domains in /proc when PCI bus numbers are not unique
	* across all PCI domains to prevent conflicts. And keep PCI domain 0
	* backward compatible in /proc for video cards.
	*/
	pci_add_flags(PCI_ENABLE_PROC_DOMAINS \| PCI_COMPAT_DOMAIN_0);
	#endif

	if (pci_has_flag(PCI_REASSIGN_ALL_BUS))
	pci_assign_all_buses = 1;

	/* Scan all of the recorded PCI controllers. */
	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
	#ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
	if (pci_assign_all_buses)
	hose->first_busno = next_busno;
	#endif
	hose->last_busno = 0xff;
	pcibios_scan_phb(hose);
	pci_bus_add_devices(hose->bus);
	#ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
	if (pci_assign_all_buses \|\| next_busno <= hose->last_busno)
	next_busno = hose->last_busno + pcibios_assign_bus_offset;
	#endif
	}

	#if defined(CONFIG_PPC_PMAC) \|\| defined(CONFIG_PPC_CHRP)
	pci_bus_count = next_busno;

	/* OpenFirmware based machines need a map of OF bus
	* numbers vs. kernel bus numbers since we may have to
	* remap them.
	*/
	if (pci_assign_all_buses)
	pcibios_make_OF_bus_map();
	#endif

	/* Call common code to handle resource allocation */
	pcibios_resource_survey();

	/* Call machine dependent fixup */
	if (ppc_md.pcibios_fixup)
	ppc_md.pcibios_fixup();

	/* Call machine dependent post-init code */
	if (ppc_md.pcibios_after_init)
	ppc_md.pcibios_after_init();

	return 0;
	}

	subsys_initcall(pcibios_init);

	static struct pci_controller*
	pci_bus_to_hose(int bus)
	{
	struct pci_controller hose, tmp;

	list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
	if (bus >= hose->first_busno && bus <= hose->last_busno)
	return hose;
	return NULL;
	}

	/* Provide information on locations of various I/O regions in physical
	* memory. Do this on a per-card basis so that we choose the right
	* root bridge.
	* Note that the returned IO or memory base is a physical address
	*/

	SYSCALL_DEFINE3(pciconfig_iobase, long, which,
	unsigned long, bus, unsigned long, devfn)
	{
	struct pci_controller* hose;
	long result = -EOPNOTSUPP;

	hose = pci_bus_to_hose(bus);
	if (!hose)
	return -ENODEV;

	switch (which) {
	case IOBASE_BRIDGE_NUMBER:
	return (long)hose->first_busno;
	case IOBASE_MEMORY:
	return (long)hose->mem_offset[0];
	case IOBASE_IO:
	return (long)hose->io_base_phys;
	case IOBASE_ISA_IO:
	return (long)isa_io_base;
	case IOBASE_ISA_MEM:
	return (long)isa_mem_base;
	}

	return result;
	}