2 * Common pmac/prep/chrp pci routines. -- Cort
5 #include <linux/kernel.h>
7 #include <linux/delay.h>
8 #include <linux/string.h>
9 #include <linux/init.h>
10 #include <linux/capability.h>
11 #include <linux/sched.h>
12 #include <linux/errno.h>
13 #include <linux/bootmem.h>
14 #include <linux/irq.h>
15 #include <linux/list.h>
17 #include <linux/slab.h>
18 #include <linux/export.h>
20 #include <asm/processor.h>
23 #include <asm/sections.h>
24 #include <asm/pci-bridge.h>
25 #include <asm/ppc-pci.h>
26 #include <asm/byteorder.h>
27 #include <asm/uaccess.h>
28 #include <asm/machdep.h>
32 unsigned long isa_io_base = 0;
33 unsigned long pci_dram_offset = 0;
34 int pcibios_assign_bus_offset = 1;
36 void pcibios_make_OF_bus_map(void);
38 static void fixup_cpc710_pci64(struct pci_dev* dev);
39 static u8* pci_to_OF_bus_map;
41 /* By default, we don't re-assign bus numbers. We do this only on
44 static int pci_assign_all_buses;
46 static int pci_bus_count;
48 /* This will remain NULL for now, until isa-bridge.c is made common
49 * to both 32-bit and 64-bit.
51 struct pci_dev *isa_bridge_pcidev;
52 EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
55 fixup_cpc710_pci64(struct pci_dev* dev)
57 /* Hide the PCI64 BARs from the kernel as their content doesn't
58 * fit well in the resource management
60 dev->resource[0].start = dev->resource[0].end = 0;
61 dev->resource[0].flags = 0;
62 dev->resource[1].start = dev->resource[1].end = 0;
63 dev->resource[1].flags = 0;
65 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64);
68 * Functions below are used on OpenFirmware machines.
71 make_one_node_map(struct device_node* node, u8 pci_bus)
76 if (pci_bus >= pci_bus_count)
78 bus_range = of_get_property(node, "bus-range", &len);
79 if (bus_range == NULL || len < 2 * sizeof(int)) {
80 printk(KERN_WARNING "Can't get bus-range for %s, "
81 "assuming it starts at 0\n", node->full_name);
82 pci_to_OF_bus_map[pci_bus] = 0;
84 pci_to_OF_bus_map[pci_bus] = bus_range[0];
86 for_each_child_of_node(node, node) {
88 const unsigned int *class_code, *reg;
90 class_code = of_get_property(node, "class-code", NULL);
91 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
92 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
94 reg = of_get_property(node, "reg", NULL);
97 dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
98 if (!dev || !dev->subordinate) {
102 make_one_node_map(node, dev->subordinate->number);
108 pcibios_make_OF_bus_map(void)
111 struct pci_controller *hose, *tmp;
112 struct property *map_prop;
113 struct device_node *dn;
115 pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
116 if (!pci_to_OF_bus_map) {
117 printk(KERN_ERR "Can't allocate OF bus map !\n");
121 /* We fill the bus map with invalid values, that helps
124 for (i=0; i<pci_bus_count; i++)
125 pci_to_OF_bus_map[i] = 0xff;
127 /* For each hose, we begin searching bridges */
128 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
129 struct device_node* node = hose->dn;
133 make_one_node_map(node, hose->first_busno);
135 dn = of_find_node_by_path("/");
136 map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
138 BUG_ON(pci_bus_count > map_prop->length);
139 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
143 printk("PCI->OF bus map:\n");
144 for (i=0; i<pci_bus_count; i++) {
145 if (pci_to_OF_bus_map[i] == 0xff)
147 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
154 * Returns the PCI device matching a given OF node
156 int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn)
158 struct pci_dev *dev = NULL;
162 /* Check if it might have a chance to be a PCI device */
163 if (!pci_find_hose_for_OF_device(node))
166 reg = of_get_property(node, "reg", &size);
167 if (!reg || size < 5 * sizeof(u32))
170 *bus = (be32_to_cpup(®[0]) >> 16) & 0xff;
171 *devfn = (be32_to_cpup(®[0]) >> 8) & 0xff;
173 /* Ok, here we need some tweak. If we have already renumbered
174 * all busses, we can't rely on the OF bus number any more.
175 * the pci_to_OF_bus_map is not enough as several PCI busses
176 * may match the same OF bus number.
178 if (!pci_to_OF_bus_map)
181 for_each_pci_dev(dev)
182 if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
183 dev->devfn == *devfn) {
184 *bus = dev->bus->number;
191 EXPORT_SYMBOL(pci_device_from_OF_node);
193 /* We create the "pci-OF-bus-map" property now so it appears in the
197 pci_create_OF_bus_map(void)
199 struct property* of_prop;
200 struct device_node *dn;
202 of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256);
205 dn = of_find_node_by_path("/");
207 memset(of_prop, -1, sizeof(struct property) + 256);
208 of_prop->name = "pci-OF-bus-map";
209 of_prop->length = 256;
210 of_prop->value = &of_prop[1];
211 prom_add_property(dn, of_prop);
216 void __devinit pcibios_setup_phb_io_space(struct pci_controller *hose)
218 unsigned long io_offset;
219 struct resource *res = &hose->io_resource;
221 /* Fixup IO space offset */
222 io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
223 res->start = (res->start + io_offset) & 0xffffffffu;
224 res->end = (res->end + io_offset) & 0xffffffffu;
227 static int __init pcibios_init(void)
229 struct pci_controller *hose, *tmp;
232 printk(KERN_INFO "PCI: Probing PCI hardware\n");
234 if (pci_has_flag(PCI_REASSIGN_ALL_BUS))
235 pci_assign_all_buses = 1;
237 /* Scan all of the recorded PCI controllers. */
238 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
239 if (pci_assign_all_buses)
240 hose->first_busno = next_busno;
241 hose->last_busno = 0xff;
242 pcibios_scan_phb(hose);
243 pci_bus_add_devices(hose->bus);
244 if (pci_assign_all_buses || next_busno <= hose->last_busno)
245 next_busno = hose->last_busno + pcibios_assign_bus_offset;
247 pci_bus_count = next_busno;
249 /* OpenFirmware based machines need a map of OF bus
250 * numbers vs. kernel bus numbers since we may have to
253 if (pci_assign_all_buses)
254 pcibios_make_OF_bus_map();
256 /* Call common code to handle resource allocation */
257 pcibios_resource_survey();
259 /* Call machine dependent post-init code */
260 if (ppc_md.pcibios_after_init)
261 ppc_md.pcibios_after_init();
266 subsys_initcall(pcibios_init);
268 static struct pci_controller*
269 pci_bus_to_hose(int bus)
271 struct pci_controller *hose, *tmp;
273 list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
274 if (bus >= hose->first_busno && bus <= hose->last_busno)
279 /* Provide information on locations of various I/O regions in physical
280 * memory. Do this on a per-card basis so that we choose the right
282 * Note that the returned IO or memory base is a physical address
285 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
287 struct pci_controller* hose;
288 long result = -EOPNOTSUPP;
290 hose = pci_bus_to_hose(bus);
295 case IOBASE_BRIDGE_NUMBER:
296 return (long)hose->first_busno;
298 return (long)hose->pci_mem_offset;
300 return (long)hose->io_base_phys;
302 return (long)isa_io_base;
304 return (long)isa_mem_base;