1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Common pmac/prep/chrp pci routines. -- Cort
4 */
5
6 #include <linux/kernel.h>
7 #include <linux/pci.h>
8 #include <linux/delay.h>
9 #include <linux/string.h>
10 #include <linux/init.h>
11 #include <linux/capability.h>
12 #include <linux/sched.h>
13 #include <linux/errno.h>
14 #include <linux/memblock.h>
15 #include <linux/syscalls.h>
16 #include <linux/irq.h>
17 #include <linux/list.h>
18 #include <linux/of.h>
19 #include <linux/slab.h>
20 #include <linux/export.h>
21
22 #include <asm/processor.h>
23 #include <asm/io.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 <linux/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 EXPORT_SYMBOL(isa_io_base);
37 EXPORT_SYMBOL(pci_dram_offset);
38
39 static void fixup_cpc710_pci64(struct pci_dev* dev);
40
41 /* By default, we don't re-assign bus numbers. We do this only on
42 * some pmacs
43 */
44 static int pci_assign_all_buses;
45
46 /* This will remain NULL for now, until isa-bridge.c is made common
47 * to both 32-bit and 64-bit.
48 */
49 struct pci_dev *isa_bridge_pcidev;
50 EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
51
52 static void
fixup_cpc710_pci64(struct pci_dev * dev)53 fixup_cpc710_pci64(struct pci_dev* dev)
54 {
55 /* Hide the PCI64 BARs from the kernel as their content doesn't
56 * fit well in the resource management
57 */
58 dev->resource[0].start = dev->resource[0].end = 0;
59 dev->resource[0].flags = 0;
60 dev->resource[1].start = dev->resource[1].end = 0;
61 dev->resource[1].flags = 0;
62 }
63 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64);
64
65 #ifdef CONFIG_PPC_PCI_OF_BUS_MAP
66
67 static u8* pci_to_OF_bus_map;
68 static int pci_bus_count;
69
70 /*
71 * Functions below are used on OpenFirmware machines.
72 */
73 static void
make_one_node_map(struct device_node * node,u8 pci_bus)74 make_one_node_map(struct device_node* node, u8 pci_bus)
75 {
76 const int *bus_range;
77 int len;
78
79 if (pci_bus >= pci_bus_count)
80 return;
81 bus_range = of_get_property(node, "bus-range", &len);
82 if (bus_range == NULL || len < 2 * sizeof(int)) {
83 printk(KERN_WARNING "Can't get bus-range for %pOF, "
84 "assuming it starts at 0\n", node);
85 pci_to_OF_bus_map[pci_bus] = 0;
86 } else
87 pci_to_OF_bus_map[pci_bus] = bus_range[0];
88
89 for_each_child_of_node(node, node) {
90 struct pci_dev* dev;
91 const unsigned int *class_code, *reg;
92
93 class_code = of_get_property(node, "class-code", NULL);
94 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
95 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
96 continue;
97 reg = of_get_property(node, "reg", NULL);
98 if (!reg)
99 continue;
100 dev = pci_get_domain_bus_and_slot(0, pci_bus,
101 ((reg[0] >> 8) & 0xff));
102 if (!dev || !dev->subordinate) {
103 pci_dev_put(dev);
104 continue;
105 }
106 make_one_node_map(node, dev->subordinate->number);
107 pci_dev_put(dev);
108 }
109 }
110
111 static void __init
pcibios_make_OF_bus_map(void)112 pcibios_make_OF_bus_map(void)
113 {
114 int i;
115 struct pci_controller *hose, *tmp;
116 struct property *map_prop;
117 struct device_node *dn;
118
119 pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
120 if (!pci_to_OF_bus_map) {
121 printk(KERN_ERR "Can't allocate OF bus map !\n");
122 return;
123 }
124
125 /* We fill the bus map with invalid values, that helps
126 * debugging.
127 */
128 for (i=0; i<pci_bus_count; i++)
129 pci_to_OF_bus_map[i] = 0xff;
130
131 /* For each hose, we begin searching bridges */
132 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
133 struct device_node* node = hose->dn;
134
135 if (!node)
136 continue;
137 make_one_node_map(node, hose->first_busno);
138 }
139 dn = of_find_node_by_path("/");
140 map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
141 if (map_prop) {
142 BUG_ON(pci_bus_count > map_prop->length);
143 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
144 }
145 of_node_put(dn);
146 #ifdef DEBUG
147 printk("PCI->OF bus map:\n");
148 for (i=0; i<pci_bus_count; i++) {
149 if (pci_to_OF_bus_map[i] == 0xff)
150 continue;
151 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
152 }
153 #endif
154 }
155 #endif // CONFIG_PPC_PCI_OF_BUS_MAP
156
157
158 #ifdef CONFIG_PPC_PMAC
159 /*
160 * Returns the PCI device matching a given OF node
161 */
pci_device_from_OF_node(struct device_node * node,u8 * bus,u8 * devfn)162 int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn)
163 {
164 #ifdef CONFIG_PPC_PCI_OF_BUS_MAP
165 struct pci_dev *dev = NULL;
166 #endif
167 const __be32 *reg;
168 int size;
169
170 /* Check if it might have a chance to be a PCI device */
171 if (!pci_find_hose_for_OF_device(node))
172 return -ENODEV;
173
174 reg = of_get_property(node, "reg", &size);
175 if (!reg || size < 5 * sizeof(u32))
176 return -ENODEV;
177
178 *bus = (be32_to_cpup(®[0]) >> 16) & 0xff;
179 *devfn = (be32_to_cpup(®[0]) >> 8) & 0xff;
180
181 #ifndef CONFIG_PPC_PCI_OF_BUS_MAP
182 return 0;
183 #else
184 /* Ok, here we need some tweak. If we have already renumbered
185 * all busses, we can't rely on the OF bus number any more.
186 * the pci_to_OF_bus_map is not enough as several PCI busses
187 * may match the same OF bus number.
188 */
189 if (!pci_to_OF_bus_map)
190 return 0;
191
192 for_each_pci_dev(dev)
193 if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
194 dev->devfn == *devfn) {
195 *bus = dev->bus->number;
196 pci_dev_put(dev);
197 return 0;
198 }
199
200 return -ENODEV;
201 #endif // CONFIG_PPC_PCI_OF_BUS_MAP
202 }
203 EXPORT_SYMBOL(pci_device_from_OF_node);
204 #endif
205
206 #ifdef CONFIG_PPC_PCI_OF_BUS_MAP
207 /* We create the "pci-OF-bus-map" property now so it appears in the
208 * /proc device tree
209 */
210 void __init
pci_create_OF_bus_map(void)211 pci_create_OF_bus_map(void)
212 {
213 struct property* of_prop;
214 struct device_node *dn;
215
216 of_prop = memblock_alloc(sizeof(struct property) + 256,
217 SMP_CACHE_BYTES);
218 if (!of_prop)
219 panic("%s: Failed to allocate %zu bytes\n", __func__,
220 sizeof(struct property) + 256);
221 dn = of_find_node_by_path("/");
222 if (dn) {
223 memset(of_prop, -1, sizeof(struct property) + 256);
224 of_prop->name = "pci-OF-bus-map";
225 of_prop->length = 256;
226 of_prop->value = &of_prop[1];
227 of_add_property(dn, of_prop);
228 of_node_put(dn);
229 }
230 }
231 #endif // CONFIG_PPC_PCI_OF_BUS_MAP
232
pcibios_setup_phb_io_space(struct pci_controller * hose)233 void pcibios_setup_phb_io_space(struct pci_controller *hose)
234 {
235 unsigned long io_offset;
236 struct resource *res = &hose->io_resource;
237
238 /* Fixup IO space offset */
239 io_offset = pcibios_io_space_offset(hose);
240 res->start += io_offset;
241 res->end += io_offset;
242 }
243
pcibios_init(void)244 static int __init pcibios_init(void)
245 {
246 struct pci_controller *hose, *tmp;
247 #ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
248 int next_busno = 0;
249 #endif
250
251 printk(KERN_INFO "PCI: Probing PCI hardware\n");
252
253 #ifdef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
254 /*
255 * Enable PCI domains in /proc when PCI bus numbers are not unique
256 * across all PCI domains to prevent conflicts. And keep PCI domain 0
257 * backward compatible in /proc for video cards.
258 */
259 pci_add_flags(PCI_ENABLE_PROC_DOMAINS | PCI_COMPAT_DOMAIN_0);
260 #endif
261
262 if (pci_has_flag(PCI_REASSIGN_ALL_BUS))
263 pci_assign_all_buses = 1;
264
265 /* Scan all of the recorded PCI controllers. */
266 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
267 #ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
268 if (pci_assign_all_buses)
269 hose->first_busno = next_busno;
270 #endif
271 hose->last_busno = 0xff;
272 pcibios_scan_phb(hose);
273 pci_bus_add_devices(hose->bus);
274 #ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
275 if (pci_assign_all_buses || next_busno <= hose->last_busno)
276 next_busno = hose->last_busno + pcibios_assign_bus_offset;
277 #endif
278 }
279
280 #if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP)
281 #ifdef CONFIG_PPC_PCI_OF_BUS_MAP
282 pci_bus_count = next_busno;
283
284 /* OpenFirmware based machines need a map of OF bus
285 * numbers vs. kernel bus numbers since we may have to
286 * remap them.
287 */
288 if (pci_assign_all_buses)
289 pcibios_make_OF_bus_map();
290 #endif
291 #endif
292
293 /* Call common code to handle resource allocation */
294 pcibios_resource_survey();
295
296 /* Call machine dependent fixup */
297 if (ppc_md.pcibios_fixup)
298 ppc_md.pcibios_fixup();
299
300 /* Call machine dependent post-init code */
301 if (ppc_md.pcibios_after_init)
302 ppc_md.pcibios_after_init();
303
304 return 0;
305 }
306
307 subsys_initcall(pcibios_init);
308
309 static struct pci_controller*
pci_bus_to_hose(int bus)310 pci_bus_to_hose(int bus)
311 {
312 struct pci_controller *hose, *tmp;
313
314 list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
315 if (bus >= hose->first_busno && bus <= hose->last_busno)
316 return hose;
317 return NULL;
318 }
319
320 /* Provide information on locations of various I/O regions in physical
321 * memory. Do this on a per-card basis so that we choose the right
322 * root bridge.
323 * Note that the returned IO or memory base is a physical address
324 */
325
SYSCALL_DEFINE3(pciconfig_iobase,long,which,unsigned long,bus,unsigned long,devfn)326 SYSCALL_DEFINE3(pciconfig_iobase, long, which,
327 unsigned long, bus, unsigned long, devfn)
328 {
329 struct pci_controller* hose;
330 long result = -EOPNOTSUPP;
331
332 hose = pci_bus_to_hose(bus);
333 if (!hose)
334 return -ENODEV;
335
336 switch (which) {
337 case IOBASE_BRIDGE_NUMBER:
338 return (long)hose->first_busno;
339 case IOBASE_MEMORY:
340 return (long)hose->mem_offset[0];
341 case IOBASE_IO:
342 return (long)hose->io_base_phys;
343 case IOBASE_ISA_IO:
344 return (long)isa_io_base;
345 case IOBASE_ISA_MEM:
346 return (long)isa_mem_base;
347 }
348
349 return result;
350 }
351