/*
* 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/bootmem.h>
#include <linux/irq.h>
#include <linux/list.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <asm/processor.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/sections.h>
#include <asm/pci-bridge.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>
#undef DEBUG
unsigned long isa_io_base;
unsigned long pci_dram_offset;
int pcibios_assign_bus_offset = 1;
static u8 *pci_to_OF_bus_map;
/* By default, we don't re-assign bus numbers. We do this only on
* some pmacs
*/
static int pci_assign_all_buses;
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 %s, "
"assuming it starts at 0\n", node->full_name);
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_bus_and_slot(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);
}
}
void
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(KERN_INFO "PCI->OF bus map:\n");
for (i = 0; i < pci_bus_count; i++) {
if (pci_to_OF_bus_map[i] == 0xff)
continue;
printk(KERN_INFO "%d -> %d\n", i, pci_to_OF_bus_map[i]);
}
#endif
}
typedef int (*pci_OF_scan_iterator)(struct device_node *node, void *data);
static struct device_node *scan_OF_pci_childs(struct device_node *parent,
pci_OF_scan_iterator filter, void *data)
{
struct device_node *node;
struct device_node *sub_node;
for_each_child_of_node(parent, node) {
const unsigned int *class_code;
if (filter(node, data)) {
of_node_put(node);
return node;
}
/* For PCI<->PCI bridges or CardBus bridges, we go down
* Note: some OFs create a parent node "multifunc-device" as
* a fake root for all functions of a multi-function device,
* we go down them as well.
*/
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)) &&
strcmp(node->name, "multifunc-device"))
continue;
sub_node = scan_OF_pci_childs(node, filter, data);
if (sub_node) {
of_node_put(node);
return sub_node;
}
}
return NULL;
}
static struct device_node *scan_OF_for_pci_dev(struct device_node *parent,
unsigned int devfn)
{
struct device_node *np, *cnp;
const u32 *reg;
unsigned int psize;
for_each_child_of_node(parent, np) {
reg = of_get_property(np, "reg", &psize);
if (reg && psize >= 4 && ((reg[0] >> 8) & 0xff) == devfn)
return np;
/* Note: some OFs create a parent node "multifunc-device" as
* a fake root for all functions of a multi-function device,
* we go down them as well. */
if (!strcmp(np->name, "multifunc-device")) {
cnp = scan_OF_for_pci_dev(np, devfn);
if (cnp)
return cnp;
}
}
return NULL;
}
static struct device_node *scan_OF_for_pci_bus(struct pci_bus *bus)
{
struct device_node *parent, *np;
/* Are we a root bus ? */
if (bus->self == NULL || bus->parent == NULL) {
struct pci_controller *hose = pci_bus_to_host(bus);
if (hose == NULL)
return NULL;
return of_node_get(hose->dn);
}
/* not a root bus, we need to get our parent */
parent = scan_OF_for_pci_bus(bus->parent);
if (parent == NULL)
return NULL;
/* now iterate for children for a match */
np = scan_OF_for_pci_dev(parent, bus->self->devfn);
of_node_put(parent);
return np;
}
/*
* Scans the OF tree for a device node matching a PCI device
*/
struct device_node *
pci_busdev_to_OF_node(struct pci_bus *bus, int devfn)
{
struct device_node *parent, *np;
pr_debug("pci_busdev_to_OF_node(%d,0x%x)\n", bus->number, devfn);
parent = scan_OF_for_pci_bus(bus);
if (parent == NULL)
return NULL;
pr_debug(" parent is %s\n", parent ? parent->full_name : "<NULL>");
np = scan_OF_for_pci_dev(parent, devfn);
of_node_put(parent);
pr_debug(" result is %s\n", np ? np->full_name : "<NULL>");
/* XXX most callers don't release the returned node
* mostly because ppc64 doesn't increase the refcount,
* we need to fix that.
*/
return np;
}
EXPORT_SYMBOL(pci_busdev_to_OF_node);
struct device_node*
pci_device_to_OF_node(struct pci_dev *dev)
{
return pci_busdev_to_OF_node(dev->bus, dev->devfn);
}
EXPORT_SYMBOL(pci_device_to_OF_node);
static int
find_OF_pci_device_filter(struct device_node *node, void *data)
{
return ((void *)node == data);
}
/*
* Returns the PCI device matching a given OF node
*/
int
pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn)
{
const unsigned int *reg;
struct pci_controller *hose;
struct pci_dev *dev = NULL;
/* Make sure it's really a PCI device */
hose = pci_find_hose_for_OF_device(node);
if (!hose || !hose->dn)
return -ENODEV;
if (!scan_OF_pci_childs(hose->dn,
find_OF_pci_device_filter, (void *)node))
return -ENODEV;
reg = of_get_property(node, "reg", NULL);
if (!reg)
return -ENODEV;
*bus = (reg[0] >> 16) & 0xff;
*devfn = ((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);
/* 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 = (struct property *) alloc_bootmem(sizeof(struct property) + \
256);
if (!of_prop)
return;
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];
prom_add_property(dn, of_prop);
of_node_put(dn);
}
}
static void __devinit pcibios_scan_phb(struct pci_controller *hose)
{
struct pci_bus *bus;
struct device_node *node = hose->dn;
unsigned long io_offset;
struct resource *res = &hose->io_resource;
pr_debug("PCI: Scanning PHB %s\n",
node ? node->full_name : "<NO NAME>");
/* Create an empty bus for the toplevel */
bus = pci_create_bus(hose->parent, hose->first_busno, hose->ops, hose);
if (bus == NULL) {
printk(KERN_ERR "Failed to create bus for PCI domain %04x\n",
hose->global_number);
return;
}
bus->secondary = hose->first_busno;
hose->bus = bus;
/* Fixup IO space offset */
io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
res->start = (res->start + io_offset) & 0xffffffffu;
res->end = (res->end + io_offset) & 0xffffffffu;
/* Wire up PHB bus resources */
pcibios_setup_phb_resources(hose);
/* Scan children */
hose->last_busno = bus->subordinate = pci_scan_child_bus(bus);
}
static int __init pcibios_init(void)
{
struct pci_controller *hose, *tmp;
int next_busno = 0;
printk(KERN_INFO "PCI: Probing PCI hardware\n");
if (pci_flags & PCI_REASSIGN_ALL_BUS) {
printk(KERN_INFO "setting pci_asign_all_busses\n");
pci_assign_all_buses = 1;
}
/* Scan all of the recorded PCI controllers. */
list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
if (pci_assign_all_buses)
hose->first_busno = next_busno;
hose->last_busno = 0xff;
pcibios_scan_phb(hose);
printk(KERN_INFO "calling pci_bus_add_devices()\n");
pci_bus_add_devices(hose->bus);
if (pci_assign_all_buses || next_busno <= hose->last_busno)
next_busno = hose->last_busno + \
pcibios_assign_bus_offset;
}
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();
/* Call common code to handle resource allocation */
pcibios_resource_survey();
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
*/
long sys_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->pci_mem_offset;
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;
}
