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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/irq.h>
15#include <linux/list.h>
16#include <linux/of.h>
17#include <linux/slab.h>
18#include <linux/export.h>
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>
25#include <asm/ppc-pci.h>
26#include <asm/byteorder.h>
27#include <linux/uaccess.h>
28#include <asm/machdep.h>
29
30#undef DEBUG
31
32unsigned long isa_io_base = 0;
33unsigned long pci_dram_offset = 0;
34int pcibios_assign_bus_offset = 1;
35EXPORT_SYMBOL(isa_io_base);
36EXPORT_SYMBOL(pci_dram_offset);
37
38void pcibios_make_OF_bus_map(void);
39
40static void fixup_cpc710_pci64(struct pci_dev* dev);
41static u8* pci_to_OF_bus_map;
42
43/* By default, we don't re-assign bus numbers. We do this only on
44 * some pmacs
45 */
46static int pci_assign_all_buses;
47
48static int pci_bus_count;
49
50/* This will remain NULL for now, until isa-bridge.c is made common
51 * to both 32-bit and 64-bit.
52 */
53struct pci_dev *isa_bridge_pcidev;
54EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
55
56static void
57fixup_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}
67DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64);
68
69/*
70 * Functions below are used on OpenFirmware machines.
71 */
72static void
73make_one_node_map(struct device_node* node, u8 pci_bus)
74{
75 const int *bus_range;
76 int len;
77
78 if (pci_bus >= pci_bus_count)
79 return;
80 bus_range = of_get_property(node, "bus-range", &len);
81 if (bus_range == NULL || len < 2 * sizeof(int)) {
82 printk(KERN_WARNING "Can't get bus-range for %pOF, "
83 "assuming it starts at 0\n", node);
84 pci_to_OF_bus_map[pci_bus] = 0;
85 } else
86 pci_to_OF_bus_map[pci_bus] = bus_range[0];
87
88 for_each_child_of_node(node, node) {
89 struct pci_dev* dev;
90 const unsigned int *class_code, *reg;
91
92 class_code = of_get_property(node, "class-code", NULL);
93 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
94 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
95 continue;
96 reg = of_get_property(node, "reg", NULL);
97 if (!reg)
98 continue;
99 dev = pci_get_domain_bus_and_slot(0, pci_bus,
100 ((reg[0] >> 8) & 0xff));
101 if (!dev || !dev->subordinate) {
102 pci_dev_put(dev);
103 continue;
104 }
105 make_one_node_map(node, dev->subordinate->number);
106 pci_dev_put(dev);
107 }
108}
109
110void
111pcibios_make_OF_bus_map(void)
112{
113 int i;
114 struct pci_controller *hose, *tmp;
115 struct property *map_prop;
116 struct device_node *dn;
117
118 pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
119 if (!pci_to_OF_bus_map) {
120 printk(KERN_ERR "Can't allocate OF bus map !\n");
121 return;
122 }
123
124 /* We fill the bus map with invalid values, that helps
125 * debugging.
126 */
127 for (i=0; i<pci_bus_count; i++)
128 pci_to_OF_bus_map[i] = 0xff;
129
130 /* For each hose, we begin searching bridges */
131 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
132 struct device_node* node = hose->dn;
133
134 if (!node)
135 continue;
136 make_one_node_map(node, hose->first_busno);
137 }
138 dn = of_find_node_by_path("/");
139 map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
140 if (map_prop) {
141 BUG_ON(pci_bus_count > map_prop->length);
142 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
143 }
144 of_node_put(dn);
145#ifdef DEBUG
146 printk("PCI->OF bus map:\n");
147 for (i=0; i<pci_bus_count; i++) {
148 if (pci_to_OF_bus_map[i] == 0xff)
149 continue;
150 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
151 }
152#endif
153}
154
155
156/*
157 * Returns the PCI device matching a given OF node
158 */
159int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn)
160{
161 struct pci_dev *dev = NULL;
162 const __be32 *reg;
163 int size;
164
165 /* Check if it might have a chance to be a PCI device */
166 if (!pci_find_hose_for_OF_device(node))
167 return -ENODEV;
168
169 reg = of_get_property(node, "reg", &size);
170 if (!reg || size < 5 * sizeof(u32))
171 return -ENODEV;
172
173 *bus = (be32_to_cpup(®[0]) >> 16) & 0xff;
174 *devfn = (be32_to_cpup(®[0]) >> 8) & 0xff;
175
176 /* Ok, here we need some tweak. If we have already renumbered
177 * all busses, we can't rely on the OF bus number any more.
178 * the pci_to_OF_bus_map is not enough as several PCI busses
179 * may match the same OF bus number.
180 */
181 if (!pci_to_OF_bus_map)
182 return 0;
183
184 for_each_pci_dev(dev)
185 if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
186 dev->devfn == *devfn) {
187 *bus = dev->bus->number;
188 pci_dev_put(dev);
189 return 0;
190 }
191
192 return -ENODEV;
193}
194EXPORT_SYMBOL(pci_device_from_OF_node);
195
196/* We create the "pci-OF-bus-map" property now so it appears in the
197 * /proc device tree
198 */
199void __init
200pci_create_OF_bus_map(void)
201{
202 struct property* of_prop;
203 struct device_node *dn;
204
205 of_prop = memblock_virt_alloc(sizeof(struct property) + 256, 0);
206 dn = of_find_node_by_path("/");
207 if (dn) {
208 memset(of_prop, -1, sizeof(struct property) + 256);
209 of_prop->name = "pci-OF-bus-map";
210 of_prop->length = 256;
211 of_prop->value = &of_prop[1];
212 of_add_property(dn, of_prop);
213 of_node_put(dn);
214 }
215}
216
217void pcibios_setup_phb_io_space(struct pci_controller *hose)
218{
219 unsigned long io_offset;
220 struct resource *res = &hose->io_resource;
221
222 /* Fixup IO space offset */
223 io_offset = pcibios_io_space_offset(hose);
224 res->start += io_offset;
225 res->end += io_offset;
226}
227
228static int __init pcibios_init(void)
229{
230 struct pci_controller *hose, *tmp;
231 int next_busno = 0;
232
233 printk(KERN_INFO "PCI: Probing PCI hardware\n");
234
235 if (pci_has_flag(PCI_REASSIGN_ALL_BUS))
236 pci_assign_all_buses = 1;
237
238 /* Scan all of the recorded PCI controllers. */
239 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
240 if (pci_assign_all_buses)
241 hose->first_busno = next_busno;
242 hose->last_busno = 0xff;
243 pcibios_scan_phb(hose);
244 pci_bus_add_devices(hose->bus);
245 if (pci_assign_all_buses || next_busno <= hose->last_busno)
246 next_busno = hose->last_busno + pcibios_assign_bus_offset;
247 }
248 pci_bus_count = next_busno;
249
250 /* OpenFirmware based machines need a map of OF bus
251 * numbers vs. kernel bus numbers since we may have to
252 * remap them.
253 */
254 if (pci_assign_all_buses)
255 pcibios_make_OF_bus_map();
256
257 /* Call common code to handle resource allocation */
258 pcibios_resource_survey();
259
260 /* Call machine dependent post-init code */
261 if (ppc_md.pcibios_after_init)
262 ppc_md.pcibios_after_init();
263
264 return 0;
265}
266
267subsys_initcall(pcibios_init);
268
269static struct pci_controller*
270pci_bus_to_hose(int bus)
271{
272 struct pci_controller *hose, *tmp;
273
274 list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
275 if (bus >= hose->first_busno && bus <= hose->last_busno)
276 return hose;
277 return NULL;
278}
279
280/* Provide information on locations of various I/O regions in physical
281 * memory. Do this on a per-card basis so that we choose the right
282 * root bridge.
283 * Note that the returned IO or memory base is a physical address
284 */
285
286long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
287{
288 struct pci_controller* hose;
289 long result = -EOPNOTSUPP;
290
291 hose = pci_bus_to_hose(bus);
292 if (!hose)
293 return -ENODEV;
294
295 switch (which) {
296 case IOBASE_BRIDGE_NUMBER:
297 return (long)hose->first_busno;
298 case IOBASE_MEMORY:
299 return (long)hose->mem_offset[0];
300 case IOBASE_IO:
301 return (long)hose->io_base_phys;
302 case IOBASE_ISA_IO:
303 return (long)isa_io_base;
304 case IOBASE_ISA_MEM:
305 return (long)isa_mem_base;
306 }
307
308 return result;
309}
310
311
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/irq.h>
15#include <linux/list.h>
16#include <linux/of.h>
17#include <linux/slab.h>
18#include <linux/export.h>
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>
25#include <asm/ppc-pci.h>
26#include <asm/byteorder.h>
27#include <linux/uaccess.h>
28#include <asm/machdep.h>
29
30#undef DEBUG
31
32unsigned long isa_io_base = 0;
33unsigned long pci_dram_offset = 0;
34int pcibios_assign_bus_offset = 1;
35EXPORT_SYMBOL(isa_io_base);
36EXPORT_SYMBOL(pci_dram_offset);
37
38void pcibios_make_OF_bus_map(void);
39
40static void fixup_cpc710_pci64(struct pci_dev* dev);
41static u8* pci_to_OF_bus_map;
42
43/* By default, we don't re-assign bus numbers. We do this only on
44 * some pmacs
45 */
46static int pci_assign_all_buses;
47
48static int pci_bus_count;
49
50/* This will remain NULL for now, until isa-bridge.c is made common
51 * to both 32-bit and 64-bit.
52 */
53struct pci_dev *isa_bridge_pcidev;
54EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
55
56static void
57fixup_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}
67DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64);
68
69/*
70 * Functions below are used on OpenFirmware machines.
71 */
72static void
73make_one_node_map(struct device_node* node, u8 pci_bus)
74{
75 const int *bus_range;
76 int len;
77
78 if (pci_bus >= pci_bus_count)
79 return;
80 bus_range = of_get_property(node, "bus-range", &len);
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
88 for_each_child_of_node(node, node) {
89 struct pci_dev* dev;
90 const unsigned int *class_code, *reg;
91
92 class_code = of_get_property(node, "class-code", NULL);
93 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
94 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
95 continue;
96 reg = of_get_property(node, "reg", NULL);
97 if (!reg)
98 continue;
99 dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
100 if (!dev || !dev->subordinate) {
101 pci_dev_put(dev);
102 continue;
103 }
104 make_one_node_map(node, dev->subordinate->number);
105 pci_dev_put(dev);
106 }
107}
108
109void
110pcibios_make_OF_bus_map(void)
111{
112 int i;
113 struct pci_controller *hose, *tmp;
114 struct property *map_prop;
115 struct device_node *dn;
116
117 pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
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 */
130 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
131 struct device_node* node = hose->dn;
132
133 if (!node)
134 continue;
135 make_one_node_map(node, hose->first_busno);
136 }
137 dn = of_find_node_by_path("/");
138 map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
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 }
143 of_node_put(dn);
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
154
155/*
156 * Returns the PCI device matching a given OF node
157 */
158int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn)
159{
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))
166 return -ENODEV;
167
168 reg = of_get_property(node, "reg", &size);
169 if (!reg || size < 5 * sizeof(u32))
170 return -ENODEV;
171
172 *bus = (be32_to_cpup(®[0]) >> 16) & 0xff;
173 *devfn = (be32_to_cpup(®[0]) >> 8) & 0xff;
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}
193EXPORT_SYMBOL(pci_device_from_OF_node);
194
195/* We create the "pci-OF-bus-map" property now so it appears in the
196 * /proc device tree
197 */
198void __init
199pci_create_OF_bus_map(void)
200{
201 struct property* of_prop;
202 struct device_node *dn;
203
204 of_prop = memblock_virt_alloc(sizeof(struct property) + 256, 0);
205 dn = of_find_node_by_path("/");
206 if (dn) {
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 of_add_property(dn, of_prop);
212 of_node_put(dn);
213 }
214}
215
216void pcibios_setup_phb_io_space(struct pci_controller *hose)
217{
218 unsigned long io_offset;
219 struct resource *res = &hose->io_resource;
220
221 /* Fixup IO space offset */
222 io_offset = pcibios_io_space_offset(hose);
223 res->start += io_offset;
224 res->end += io_offset;
225}
226
227static int __init pcibios_init(void)
228{
229 struct pci_controller *hose, *tmp;
230 int next_busno = 0;
231
232 printk(KERN_INFO "PCI: Probing PCI hardware\n");
233
234 if (pci_has_flag(PCI_REASSIGN_ALL_BUS))
235 pci_assign_all_buses = 1;
236
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;
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 */
253 if (pci_assign_all_buses)
254 pcibios_make_OF_bus_map();
255
256 /* Call common code to handle resource allocation */
257 pcibios_resource_survey();
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
266subsys_initcall(pcibios_init);
267
268static struct pci_controller*
269pci_bus_to_hose(int bus)
270{
271 struct pci_controller *hose, *tmp;
272
273 list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
274 if (bus >= hose->first_busno && bus <= hose->last_busno)
275 return hose;
276 return NULL;
277}
278
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
285long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
286{
287 struct pci_controller* hose;
288 long result = -EOPNOTSUPP;
289
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:
298 return (long)hose->mem_offset[0];
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
310