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