x86/efi: Enforce CONFIG_RELOCATABLE for EFI boot stub
[linux/fpc-iii.git] / arch / powerpc / kernel / pci_of_scan.c
blob4368ec6fdc8c4084c149150a45e6ee2f3150fdcf
1 /*
2 * Helper routines to scan the device tree for PCI devices and busses
4 * Migrated out of PowerPC architecture pci_64.c file by Grant Likely
5 * <grant.likely@secretlab.ca> so that these routines are available for
6 * 32 bit also.
8 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
9 * Rework, based on alpha PCI code.
10 * Copyright (c) 2009 Secret Lab Technologies Ltd.
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * version 2 as published by the Free Software Foundation.
17 #include <linux/pci.h>
18 #include <linux/export.h>
19 #include <asm/pci-bridge.h>
20 #include <asm/prom.h>
22 /**
23 * get_int_prop - Decode a u32 from a device tree property
25 static u32 get_int_prop(struct device_node *np, const char *name, u32 def)
27 const __be32 *prop;
28 int len;
30 prop = of_get_property(np, name, &len);
31 if (prop && len >= 4)
32 return of_read_number(prop, 1);
33 return def;
36 /**
37 * pci_parse_of_flags - Parse the flags cell of a device tree PCI address
38 * @addr0: value of 1st cell of a device tree PCI address.
39 * @bridge: Set this flag if the address is from a bridge 'ranges' property
41 unsigned int pci_parse_of_flags(u32 addr0, int bridge)
43 unsigned int flags = 0;
45 if (addr0 & 0x02000000) {
46 flags = IORESOURCE_MEM | PCI_BASE_ADDRESS_SPACE_MEMORY;
47 flags |= (addr0 >> 22) & PCI_BASE_ADDRESS_MEM_TYPE_64;
48 flags |= (addr0 >> 28) & PCI_BASE_ADDRESS_MEM_TYPE_1M;
49 if (addr0 & 0x40000000)
50 flags |= IORESOURCE_PREFETCH
51 | PCI_BASE_ADDRESS_MEM_PREFETCH;
52 /* Note: We don't know whether the ROM has been left enabled
53 * by the firmware or not. We mark it as disabled (ie, we do
54 * not set the IORESOURCE_ROM_ENABLE flag) for now rather than
55 * do a config space read, it will be force-enabled if needed
57 if (!bridge && (addr0 & 0xff) == 0x30)
58 flags |= IORESOURCE_READONLY;
59 } else if (addr0 & 0x01000000)
60 flags = IORESOURCE_IO | PCI_BASE_ADDRESS_SPACE_IO;
61 if (flags)
62 flags |= IORESOURCE_SIZEALIGN;
63 return flags;
66 /**
67 * of_pci_parse_addrs - Parse PCI addresses assigned in the device tree node
68 * @node: device tree node for the PCI device
69 * @dev: pci_dev structure for the device
71 * This function parses the 'assigned-addresses' property of a PCI devices'
72 * device tree node and writes them into the associated pci_dev structure.
74 static void of_pci_parse_addrs(struct device_node *node, struct pci_dev *dev)
76 u64 base, size;
77 unsigned int flags;
78 struct pci_bus_region region;
79 struct resource *res;
80 const __be32 *addrs;
81 u32 i;
82 int proplen;
84 addrs = of_get_property(node, "assigned-addresses", &proplen);
85 if (!addrs)
86 return;
87 pr_debug(" parse addresses (%d bytes) @ %p\n", proplen, addrs);
88 for (; proplen >= 20; proplen -= 20, addrs += 5) {
89 flags = pci_parse_of_flags(of_read_number(addrs, 1), 0);
90 if (!flags)
91 continue;
92 base = of_read_number(&addrs[1], 2);
93 size = of_read_number(&addrs[3], 2);
94 if (!size)
95 continue;
96 i = of_read_number(addrs, 1) & 0xff;
97 pr_debug(" base: %llx, size: %llx, i: %x\n",
98 (unsigned long long)base,
99 (unsigned long long)size, i);
101 if (PCI_BASE_ADDRESS_0 <= i && i <= PCI_BASE_ADDRESS_5) {
102 res = &dev->resource[(i - PCI_BASE_ADDRESS_0) >> 2];
103 } else if (i == dev->rom_base_reg) {
104 res = &dev->resource[PCI_ROM_RESOURCE];
105 flags |= IORESOURCE_READONLY | IORESOURCE_CACHEABLE;
106 } else {
107 printk(KERN_ERR "PCI: bad cfg reg num 0x%x\n", i);
108 continue;
110 res->flags = flags;
111 res->name = pci_name(dev);
112 region.start = base;
113 region.end = base + size - 1;
114 pcibios_bus_to_resource(dev, res, &region);
119 * of_create_pci_dev - Given a device tree node on a pci bus, create a pci_dev
120 * @node: device tree node pointer
121 * @bus: bus the device is sitting on
122 * @devfn: PCI function number, extracted from device tree by caller.
124 struct pci_dev *of_create_pci_dev(struct device_node *node,
125 struct pci_bus *bus, int devfn)
127 struct pci_dev *dev;
128 const char *type;
129 struct pci_slot *slot;
131 dev = pci_alloc_dev(bus);
132 if (!dev)
133 return NULL;
134 type = of_get_property(node, "device_type", NULL);
135 if (type == NULL)
136 type = "";
138 pr_debug(" create device, devfn: %x, type: %s\n", devfn, type);
140 dev->dev.of_node = of_node_get(node);
141 dev->dev.parent = bus->bridge;
142 dev->dev.bus = &pci_bus_type;
143 dev->devfn = devfn;
144 dev->multifunction = 0; /* maybe a lie? */
145 dev->needs_freset = 0; /* pcie fundamental reset required */
146 set_pcie_port_type(dev);
148 list_for_each_entry(slot, &dev->bus->slots, list)
149 if (PCI_SLOT(dev->devfn) == slot->number)
150 dev->slot = slot;
152 dev->vendor = get_int_prop(node, "vendor-id", 0xffff);
153 dev->device = get_int_prop(node, "device-id", 0xffff);
154 dev->subsystem_vendor = get_int_prop(node, "subsystem-vendor-id", 0);
155 dev->subsystem_device = get_int_prop(node, "subsystem-id", 0);
157 dev->cfg_size = pci_cfg_space_size(dev);
159 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(bus),
160 dev->bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn));
161 dev->class = get_int_prop(node, "class-code", 0);
162 dev->revision = get_int_prop(node, "revision-id", 0);
164 pr_debug(" class: 0x%x\n", dev->class);
165 pr_debug(" revision: 0x%x\n", dev->revision);
167 dev->current_state = PCI_UNKNOWN; /* unknown power state */
168 dev->error_state = pci_channel_io_normal;
169 dev->dma_mask = 0xffffffff;
171 /* Early fixups, before probing the BARs */
172 pci_fixup_device(pci_fixup_early, dev);
174 if (!strcmp(type, "pci") || !strcmp(type, "pciex")) {
175 /* a PCI-PCI bridge */
176 dev->hdr_type = PCI_HEADER_TYPE_BRIDGE;
177 dev->rom_base_reg = PCI_ROM_ADDRESS1;
178 set_pcie_hotplug_bridge(dev);
179 } else if (!strcmp(type, "cardbus")) {
180 dev->hdr_type = PCI_HEADER_TYPE_CARDBUS;
181 } else {
182 dev->hdr_type = PCI_HEADER_TYPE_NORMAL;
183 dev->rom_base_reg = PCI_ROM_ADDRESS;
184 /* Maybe do a default OF mapping here */
185 dev->irq = NO_IRQ;
188 of_pci_parse_addrs(node, dev);
190 pr_debug(" adding to system ...\n");
192 pci_device_add(dev, bus);
194 return dev;
196 EXPORT_SYMBOL(of_create_pci_dev);
199 * of_scan_pci_bridge - Set up a PCI bridge and scan for child nodes
200 * @dev: pci_dev structure for the bridge
202 * of_scan_bus() calls this routine for each PCI bridge that it finds, and
203 * this routine in turn call of_scan_bus() recusively to scan for more child
204 * devices.
206 void of_scan_pci_bridge(struct pci_dev *dev)
208 struct device_node *node = dev->dev.of_node;
209 struct pci_bus *bus;
210 const __be32 *busrange, *ranges;
211 int len, i, mode;
212 struct pci_bus_region region;
213 struct resource *res;
214 unsigned int flags;
215 u64 size;
217 pr_debug("of_scan_pci_bridge(%s)\n", node->full_name);
219 /* parse bus-range property */
220 busrange = of_get_property(node, "bus-range", &len);
221 if (busrange == NULL || len != 8) {
222 printk(KERN_DEBUG "Can't get bus-range for PCI-PCI bridge %s\n",
223 node->full_name);
224 return;
226 ranges = of_get_property(node, "ranges", &len);
227 if (ranges == NULL) {
228 printk(KERN_DEBUG "Can't get ranges for PCI-PCI bridge %s\n",
229 node->full_name);
230 return;
233 bus = pci_find_bus(pci_domain_nr(dev->bus),
234 of_read_number(busrange, 1));
235 if (!bus) {
236 bus = pci_add_new_bus(dev->bus, dev,
237 of_read_number(busrange, 1));
238 if (!bus) {
239 printk(KERN_ERR "Failed to create pci bus for %s\n",
240 node->full_name);
241 return;
245 bus->primary = dev->bus->number;
246 pci_bus_insert_busn_res(bus, of_read_number(busrange, 1),
247 of_read_number(busrange+1, 1));
248 bus->bridge_ctl = 0;
250 /* parse ranges property */
251 /* PCI #address-cells == 3 and #size-cells == 2 always */
252 res = &dev->resource[PCI_BRIDGE_RESOURCES];
253 for (i = 0; i < PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES; ++i) {
254 res->flags = 0;
255 bus->resource[i] = res;
256 ++res;
258 i = 1;
259 for (; len >= 32; len -= 32, ranges += 8) {
260 flags = pci_parse_of_flags(of_read_number(ranges, 1), 1);
261 size = of_read_number(&ranges[6], 2);
262 if (flags == 0 || size == 0)
263 continue;
264 if (flags & IORESOURCE_IO) {
265 res = bus->resource[0];
266 if (res->flags) {
267 printk(KERN_ERR "PCI: ignoring extra I/O range"
268 " for bridge %s\n", node->full_name);
269 continue;
271 } else {
272 if (i >= PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES) {
273 printk(KERN_ERR "PCI: too many memory ranges"
274 " for bridge %s\n", node->full_name);
275 continue;
277 res = bus->resource[i];
278 ++i;
280 res->flags = flags;
281 region.start = of_read_number(&ranges[1], 2);
282 region.end = region.start + size - 1;
283 pcibios_bus_to_resource(dev, res, &region);
285 sprintf(bus->name, "PCI Bus %04x:%02x", pci_domain_nr(bus),
286 bus->number);
287 pr_debug(" bus name: %s\n", bus->name);
289 mode = PCI_PROBE_NORMAL;
290 if (ppc_md.pci_probe_mode)
291 mode = ppc_md.pci_probe_mode(bus);
292 pr_debug(" probe mode: %d\n", mode);
294 if (mode == PCI_PROBE_DEVTREE)
295 of_scan_bus(node, bus);
296 else if (mode == PCI_PROBE_NORMAL)
297 pci_scan_child_bus(bus);
299 EXPORT_SYMBOL(of_scan_pci_bridge);
301 static struct pci_dev *of_scan_pci_dev(struct pci_bus *bus,
302 struct device_node *dn)
304 struct pci_dev *dev = NULL;
305 const u32 *reg;
306 int reglen, devfn;
308 pr_debug(" * %s\n", dn->full_name);
309 if (!of_device_is_available(dn))
310 return NULL;
312 reg = of_get_property(dn, "reg", &reglen);
313 if (reg == NULL || reglen < 20)
314 return NULL;
315 devfn = (reg[0] >> 8) & 0xff;
317 /* Check if the PCI device is already there */
318 dev = pci_get_slot(bus, devfn);
319 if (dev) {
320 pci_dev_put(dev);
321 return dev;
324 /* create a new pci_dev for this device */
325 dev = of_create_pci_dev(dn, bus, devfn);
326 if (!dev)
327 return NULL;
329 pr_debug(" dev header type: %x\n", dev->hdr_type);
330 return dev;
334 * __of_scan_bus - given a PCI bus node, setup bus and scan for child devices
335 * @node: device tree node for the PCI bus
336 * @bus: pci_bus structure for the PCI bus
337 * @rescan_existing: Flag indicating bus has already been set up
339 static void __of_scan_bus(struct device_node *node, struct pci_bus *bus,
340 int rescan_existing)
342 struct device_node *child;
343 struct pci_dev *dev;
345 pr_debug("of_scan_bus(%s) bus no %d...\n",
346 node->full_name, bus->number);
348 /* Scan direct children */
349 for_each_child_of_node(node, child) {
350 dev = of_scan_pci_dev(bus, child);
351 if (!dev)
352 continue;
353 pr_debug(" dev header type: %x\n", dev->hdr_type);
356 /* Apply all fixups necessary. We don't fixup the bus "self"
357 * for an existing bridge that is being rescanned
359 if (!rescan_existing)
360 pcibios_setup_bus_self(bus);
361 pcibios_setup_bus_devices(bus);
363 /* Now scan child busses */
364 list_for_each_entry(dev, &bus->devices, bus_list) {
365 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
366 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
367 of_scan_pci_bridge(dev);
373 * of_scan_bus - given a PCI bus node, setup bus and scan for child devices
374 * @node: device tree node for the PCI bus
375 * @bus: pci_bus structure for the PCI bus
377 void of_scan_bus(struct device_node *node, struct pci_bus *bus)
379 __of_scan_bus(node, bus, 0);
381 EXPORT_SYMBOL_GPL(of_scan_bus);
384 * of_rescan_bus - given a PCI bus node, scan for child devices
385 * @node: device tree node for the PCI bus
386 * @bus: pci_bus structure for the PCI bus
388 * Same as of_scan_bus, but for a pci_bus structure that has already been
389 * setup.
391 void of_rescan_bus(struct device_node *node, struct pci_bus *bus)
393 __of_scan_bus(node, bus, 1);
395 EXPORT_SYMBOL_GPL(of_rescan_bus);