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Commit | Line | Data |
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e05b3b4a PM |
1 | /* |
2 | * Common pmac/prep/chrp pci routines. -- Cort | |
3 | */ | |
4 | ||
e05b3b4a PM |
5 | #include <linux/kernel.h> |
6 | #include <linux/pci.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> | |
6e99e458 | 14 | #include <linux/irq.h> |
f90bb153 | 15 | #include <linux/list.h> |
66524b22 | 16 | #include <linux/of.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
93087948 | 18 | #include <linux/export.h> |
e05b3b4a PM |
19 | |
20 | #include <asm/processor.h> | |
21 | #include <asm/io.h> | |
22 | #include <asm/prom.h> | |
23 | #include <asm/sections.h> | |
24 | #include <asm/pci-bridge.h> | |
c3bd517d | 25 | #include <asm/ppc-pci.h> |
e05b3b4a | 26 | #include <asm/byteorder.h> |
7c0f6ba6 | 27 | #include <linux/uaccess.h> |
e05b3b4a PM |
28 | #include <asm/machdep.h> |
29 | ||
30 | #undef DEBUG | |
31 | ||
e05b3b4a | 32 | unsigned long isa_io_base = 0; |
e05b3b4a PM |
33 | unsigned long pci_dram_offset = 0; |
34 | int pcibios_assign_bus_offset = 1; | |
9445aa1a AV |
35 | EXPORT_SYMBOL(isa_io_base); |
36 | EXPORT_SYMBOL(pci_dram_offset); | |
e05b3b4a PM |
37 | |
38 | void pcibios_make_OF_bus_map(void); | |
39 | ||
e05b3b4a | 40 | static void fixup_cpc710_pci64(struct pci_dev* dev); |
e05b3b4a | 41 | static u8* pci_to_OF_bus_map; |
e05b3b4a PM |
42 | |
43 | /* By default, we don't re-assign bus numbers. We do this only on | |
44 | * some pmacs | |
45 | */ | |
fc3fb71c | 46 | static int pci_assign_all_buses; |
e05b3b4a | 47 | |
e05b3b4a PM |
48 | static int pci_bus_count; |
49 | ||
7b6b574c BH |
50 | /* This will remain NULL for now, until isa-bridge.c is made common |
51 | * to both 32-bit and 64-bit. | |
52 | */ | |
53 | struct pci_dev *isa_bridge_pcidev; | |
54 | EXPORT_SYMBOL_GPL(isa_bridge_pcidev); | |
55 | ||
e05b3b4a PM |
56 | static void |
57 | fixup_cpc710_pci64(struct pci_dev* dev) | |
58 | { | |
59 | /* Hide the PCI64 BARs from the kernel as their content doesn't | |
60 | * fit well in the resource management | |
61 | */ | |
62 | dev->resource[0].start = dev->resource[0].end = 0; | |
63 | dev->resource[0].flags = 0; | |
64 | dev->resource[1].start = dev->resource[1].end = 0; | |
65 | dev->resource[1].flags = 0; | |
66 | } | |
67 | DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64); | |
68 | ||
e05b3b4a PM |
69 | /* |
70 | * Functions below are used on OpenFirmware machines. | |
71 | */ | |
72 | static void | |
73 | make_one_node_map(struct device_node* node, u8 pci_bus) | |
74 | { | |
a7f67bdf | 75 | const int *bus_range; |
e05b3b4a PM |
76 | int len; |
77 | ||
78 | if (pci_bus >= pci_bus_count) | |
79 | return; | |
e2eb6392 | 80 | bus_range = of_get_property(node, "bus-range", &len); |
e05b3b4a PM |
81 | if (bus_range == NULL || len < 2 * sizeof(int)) { |
82 | printk(KERN_WARNING "Can't get bus-range for %s, " | |
83 | "assuming it starts at 0\n", node->full_name); | |
84 | pci_to_OF_bus_map[pci_bus] = 0; | |
85 | } else | |
86 | pci_to_OF_bus_map[pci_bus] = bus_range[0]; | |
87 | ||
66524b22 | 88 | for_each_child_of_node(node, node) { |
e05b3b4a | 89 | struct pci_dev* dev; |
a7f67bdf | 90 | const unsigned int *class_code, *reg; |
e05b3b4a | 91 | |
e2eb6392 | 92 | class_code = of_get_property(node, "class-code", NULL); |
e05b3b4a PM |
93 | if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && |
94 | (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) | |
95 | continue; | |
e2eb6392 | 96 | reg = of_get_property(node, "reg", NULL); |
e05b3b4a PM |
97 | if (!reg) |
98 | continue; | |
ab462768 AC |
99 | dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff)); |
100 | if (!dev || !dev->subordinate) { | |
101 | pci_dev_put(dev); | |
e05b3b4a | 102 | continue; |
ab462768 | 103 | } |
e05b3b4a | 104 | make_one_node_map(node, dev->subordinate->number); |
ab462768 | 105 | pci_dev_put(dev); |
e05b3b4a PM |
106 | } |
107 | } | |
108 | ||
109 | void | |
110 | pcibios_make_OF_bus_map(void) | |
111 | { | |
112 | int i; | |
a4c9e328 | 113 | struct pci_controller *hose, *tmp; |
a7f67bdf | 114 | struct property *map_prop; |
8c8dc322 | 115 | struct device_node *dn; |
e05b3b4a | 116 | |
5cbded58 | 117 | pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL); |
e05b3b4a PM |
118 | if (!pci_to_OF_bus_map) { |
119 | printk(KERN_ERR "Can't allocate OF bus map !\n"); | |
120 | return; | |
121 | } | |
122 | ||
123 | /* We fill the bus map with invalid values, that helps | |
124 | * debugging. | |
125 | */ | |
126 | for (i=0; i<pci_bus_count; i++) | |
127 | pci_to_OF_bus_map[i] = 0xff; | |
128 | ||
129 | /* For each hose, we begin searching bridges */ | |
a4c9e328 | 130 | list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { |
44ef3390 SR |
131 | struct device_node* node = hose->dn; |
132 | ||
e05b3b4a PM |
133 | if (!node) |
134 | continue; | |
135 | make_one_node_map(node, hose->first_busno); | |
136 | } | |
8c8dc322 SR |
137 | dn = of_find_node_by_path("/"); |
138 | map_prop = of_find_property(dn, "pci-OF-bus-map", NULL); | |
a7f67bdf JK |
139 | if (map_prop) { |
140 | BUG_ON(pci_bus_count > map_prop->length); | |
141 | memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count); | |
142 | } | |
8c8dc322 | 143 | of_node_put(dn); |
e05b3b4a PM |
144 | #ifdef DEBUG |
145 | printk("PCI->OF bus map:\n"); | |
146 | for (i=0; i<pci_bus_count; i++) { | |
147 | if (pci_to_OF_bus_map[i] == 0xff) | |
148 | continue; | |
149 | printk("%d -> %d\n", i, pci_to_OF_bus_map[i]); | |
150 | } | |
151 | #endif | |
152 | } | |
153 | ||
e05b3b4a PM |
154 | |
155 | /* | |
156 | * Returns the PCI device matching a given OF node | |
157 | */ | |
98d9f30c | 158 | int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn) |
e05b3b4a | 159 | { |
98d9f30c BH |
160 | struct pci_dev *dev = NULL; |
161 | const __be32 *reg; | |
162 | int size; | |
163 | ||
164 | /* Check if it might have a chance to be a PCI device */ | |
165 | if (!pci_find_hose_for_OF_device(node)) | |
e05b3b4a | 166 | return -ENODEV; |
98d9f30c BH |
167 | |
168 | reg = of_get_property(node, "reg", &size); | |
169 | if (!reg || size < 5 * sizeof(u32)) | |
e05b3b4a | 170 | return -ENODEV; |
98d9f30c BH |
171 | |
172 | *bus = (be32_to_cpup(®[0]) >> 16) & 0xff; | |
173 | *devfn = (be32_to_cpup(®[0]) >> 8) & 0xff; | |
e05b3b4a PM |
174 | |
175 | /* Ok, here we need some tweak. If we have already renumbered | |
176 | * all busses, we can't rely on the OF bus number any more. | |
177 | * the pci_to_OF_bus_map is not enough as several PCI busses | |
178 | * may match the same OF bus number. | |
179 | */ | |
180 | if (!pci_to_OF_bus_map) | |
181 | return 0; | |
182 | ||
183 | for_each_pci_dev(dev) | |
184 | if (pci_to_OF_bus_map[dev->bus->number] == *bus && | |
185 | dev->devfn == *devfn) { | |
186 | *bus = dev->bus->number; | |
187 | pci_dev_put(dev); | |
188 | return 0; | |
189 | } | |
190 | ||
191 | return -ENODEV; | |
192 | } | |
193 | EXPORT_SYMBOL(pci_device_from_OF_node); | |
194 | ||
e05b3b4a PM |
195 | /* We create the "pci-OF-bus-map" property now so it appears in the |
196 | * /proc device tree | |
197 | */ | |
198 | void __init | |
199 | pci_create_OF_bus_map(void) | |
200 | { | |
201 | struct property* of_prop; | |
8c8dc322 SR |
202 | struct device_node *dn; |
203 | ||
e39f223f | 204 | of_prop = memblock_virt_alloc(sizeof(struct property) + 256, 0); |
8c8dc322 SR |
205 | dn = of_find_node_by_path("/"); |
206 | if (dn) { | |
e05b3b4a PM |
207 | memset(of_prop, -1, sizeof(struct property) + 256); |
208 | of_prop->name = "pci-OF-bus-map"; | |
209 | of_prop->length = 256; | |
1a38147e | 210 | of_prop->value = &of_prop[1]; |
79d1c712 | 211 | of_add_property(dn, of_prop); |
8c8dc322 | 212 | of_node_put(dn); |
e05b3b4a PM |
213 | } |
214 | } | |
215 | ||
cad5cef6 | 216 | void pcibios_setup_phb_io_space(struct pci_controller *hose) |
53280323 | 217 | { |
53280323 BH |
218 | unsigned long io_offset; |
219 | struct resource *res = &hose->io_resource; | |
220 | ||
53280323 | 221 | /* Fixup IO space offset */ |
38973ba7 BH |
222 | io_offset = pcibios_io_space_offset(hose); |
223 | res->start += io_offset; | |
224 | res->end += io_offset; | |
53280323 BH |
225 | } |
226 | ||
3fd94c6b | 227 | static int __init pcibios_init(void) |
e05b3b4a | 228 | { |
a4c9e328 | 229 | struct pci_controller *hose, *tmp; |
a4c9e328 | 230 | int next_busno = 0; |
e05b3b4a PM |
231 | |
232 | printk(KERN_INFO "PCI: Probing PCI hardware\n"); | |
233 | ||
0e47ff1c | 234 | if (pci_has_flag(PCI_REASSIGN_ALL_BUS)) |
fc3fb71c BH |
235 | pci_assign_all_buses = 1; |
236 | ||
e05b3b4a | 237 | /* Scan all of the recorded PCI controllers. */ |
a4c9e328 | 238 | list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { |
e05b3b4a PM |
239 | if (pci_assign_all_buses) |
240 | hose->first_busno = next_busno; | |
241 | hose->last_busno = 0xff; | |
b5d937de | 242 | pcibios_scan_phb(hose); |
53280323 | 243 | pci_bus_add_devices(hose->bus); |
e05b3b4a PM |
244 | if (pci_assign_all_buses || next_busno <= hose->last_busno) |
245 | next_busno = hose->last_busno + pcibios_assign_bus_offset; | |
246 | } | |
247 | pci_bus_count = next_busno; | |
248 | ||
249 | /* OpenFirmware based machines need a map of OF bus | |
250 | * numbers vs. kernel bus numbers since we may have to | |
251 | * remap them. | |
252 | */ | |
6b82b3e4 | 253 | if (pci_assign_all_buses) |
e05b3b4a PM |
254 | pcibios_make_OF_bus_map(); |
255 | ||
3fd94c6b BH |
256 | /* Call common code to handle resource allocation */ |
257 | pcibios_resource_survey(); | |
e05b3b4a PM |
258 | |
259 | /* Call machine dependent post-init code */ | |
260 | if (ppc_md.pcibios_after_init) | |
261 | ppc_md.pcibios_after_init(); | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
266 | subsys_initcall(pcibios_init); | |
267 | ||
0b1d40c4 | 268 | static struct pci_controller* |
e05b3b4a PM |
269 | pci_bus_to_hose(int bus) |
270 | { | |
a4c9e328 | 271 | struct pci_controller *hose, *tmp; |
e05b3b4a | 272 | |
a4c9e328 | 273 | list_for_each_entry_safe(hose, tmp, &hose_list, list_node) |
e05b3b4a PM |
274 | if (bus >= hose->first_busno && bus <= hose->last_busno) |
275 | return hose; | |
276 | return NULL; | |
277 | } | |
278 | ||
e05b3b4a PM |
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 | |
281 | * root bridge. | |
282 | * Note that the returned IO or memory base is a physical address | |
283 | */ | |
284 | ||
285 | long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn) | |
286 | { | |
287 | struct pci_controller* hose; | |
288 | long result = -EOPNOTSUPP; | |
289 | ||
e05b3b4a PM |
290 | hose = pci_bus_to_hose(bus); |
291 | if (!hose) | |
292 | return -ENODEV; | |
293 | ||
294 | switch (which) { | |
295 | case IOBASE_BRIDGE_NUMBER: | |
296 | return (long)hose->first_busno; | |
297 | case IOBASE_MEMORY: | |
3fd47f06 | 298 | return (long)hose->mem_offset[0]; |
e05b3b4a PM |
299 | case IOBASE_IO: |
300 | return (long)hose->io_base_phys; | |
301 | case IOBASE_ISA_IO: | |
302 | return (long)isa_io_base; | |
303 | case IOBASE_ISA_MEM: | |
304 | return (long)isa_mem_base; | |
305 | } | |
306 | ||
307 | return result; | |
308 | } | |
309 | ||
e05b3b4a | 310 |