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Diffstat (limited to 'arch/microblaze/pci/pci_32.c')
-rw-r--r--arch/microblaze/pci/pci_32.c430
1 files changed, 430 insertions, 0 deletions
diff --git a/arch/microblaze/pci/pci_32.c b/arch/microblaze/pci/pci_32.c
new file mode 100644
index 000000000000..7e0c94f501cc
--- /dev/null
+++ b/arch/microblaze/pci/pci_32.c
@@ -0,0 +1,430 @@
+/*
+ * 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 <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;
+}