2 * This program is free software; you can redistribute it and/or modify it
3 * under the terms of the GNU General Public License as published by the
4 * Free Software Foundation; either version 2 of the License, or (at your
5 * option) any later version.
8 * Copyright (C) 2011 Wind River Systems,
11 #include <linux/bug.h>
12 #include <linux/kernel.h>
14 #include <linux/bootmem.h>
15 #include <linux/export.h>
16 #include <linux/init.h>
17 #include <linux/types.h>
18 #include <linux/pci.h>
19 #include <linux/of_address.h>
21 #include <asm/cpu-info.h>
24 * If PCI_PROBE_ONLY in pci_flags is set, we don't change any PCI resource
29 * The PCI controller list.
31 static LIST_HEAD(controllers);
33 static int pci_initialized;
36 * We need to avoid collisions with `mirrored' VGA ports
37 * and other strange ISA hardware, so we always want the
38 * addresses to be allocated in the 0x000-0x0ff region
41 * Why? Because some silly external IO cards only decode
42 * the low 10 bits of the IO address. The 0x00-0xff region
43 * is reserved for motherboard devices that decode all 16
44 * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
45 * but we want to try to avoid allocating at 0x2900-0x2bff
46 * which might have be mirrored at 0x0100-0x03ff..
49 pcibios_align_resource(void *data, const struct resource *res,
50 resource_size_t size, resource_size_t align)
52 struct pci_dev *dev = data;
53 struct pci_controller *hose = dev->sysdata;
54 resource_size_t start = res->start;
56 if (res->flags & IORESOURCE_IO) {
57 /* Make sure we start at our min on all hoses */
58 if (start < PCIBIOS_MIN_IO + hose->io_resource->start)
59 start = PCIBIOS_MIN_IO + hose->io_resource->start;
62 * Put everything into 0x00-0xff region modulo 0x400
65 start = (start + 0x3ff) & ~0x3ff;
66 } else if (res->flags & IORESOURCE_MEM) {
67 /* Make sure we start at our min on all hoses */
68 if (start < PCIBIOS_MIN_MEM + hose->mem_resource->start)
69 start = PCIBIOS_MIN_MEM + hose->mem_resource->start;
75 static void pcibios_scanbus(struct pci_controller *hose)
77 static int next_busno;
78 static int need_domain_info;
82 if (hose->get_busno && pci_has_flag(PCI_PROBE_ONLY))
83 next_busno = (*hose->get_busno)();
85 pci_add_resource_offset(&resources,
86 hose->mem_resource, hose->mem_offset);
87 pci_add_resource_offset(&resources,
88 hose->io_resource, hose->io_offset);
89 pci_add_resource_offset(&resources,
90 hose->busn_resource, hose->busn_offset);
91 bus = pci_scan_root_bus(NULL, next_busno, hose->pci_ops, hose,
95 need_domain_info = need_domain_info || pci_domain_nr(bus);
96 set_pci_need_domain_info(hose, need_domain_info);
99 pci_free_resource_list(&resources);
103 next_busno = bus->busn_res.end + 1;
104 /* Don't allow 8-bit bus number overflow inside the hose -
105 reserve some space for bridges. */
106 if (next_busno > 224) {
108 need_domain_info = 1;
112 * We insert PCI resources into the iomem_resource and
113 * ioport_resource trees in either pci_bus_claim_resources()
114 * or pci_bus_assign_resources().
116 if (pci_has_flag(PCI_PROBE_ONLY)) {
117 pci_bus_claim_resources(bus);
119 pci_bus_size_bridges(bus);
120 pci_bus_assign_resources(bus);
122 pci_bus_add_devices(bus);
126 void pci_load_of_ranges(struct pci_controller *hose, struct device_node *node)
128 struct of_pci_range range;
129 struct of_pci_range_parser parser;
131 pr_info("PCI host bridge %s ranges:\n", node->full_name);
132 hose->of_node = node;
134 if (of_pci_range_parser_init(&parser, node))
137 for_each_of_pci_range(&parser, &range) {
138 struct resource *res = NULL;
140 switch (range.flags & IORESOURCE_TYPE_BITS) {
142 pr_info(" IO 0x%016llx..0x%016llx\n",
144 range.cpu_addr + range.size - 1);
146 (unsigned long)ioremap(range.cpu_addr,
148 res = hose->io_resource;
151 pr_info(" MEM 0x%016llx..0x%016llx\n",
153 range.cpu_addr + range.size - 1);
154 res = hose->mem_resource;
158 of_pci_range_to_resource(&range, node, res);
162 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
164 struct pci_controller *hose = bus->sysdata;
166 return of_node_get(hose->of_node);
170 static DEFINE_MUTEX(pci_scan_mutex);
172 void register_pci_controller(struct pci_controller *hose)
174 struct resource *parent;
176 parent = hose->mem_resource->parent;
178 parent = &iomem_resource;
180 if (request_resource(parent, hose->mem_resource) < 0)
183 parent = hose->io_resource->parent;
185 parent = &ioport_resource;
187 if (request_resource(parent, hose->io_resource) < 0) {
188 release_resource(hose->mem_resource);
192 INIT_LIST_HEAD(&hose->list);
193 list_add(&hose->list, &controllers);
196 * Do not panic here but later - this might happen before console init.
198 if (!hose->io_map_base) {
200 "registering PCI controller with io_map_base unset\n");
204 * Scan the bus if it is register after the PCI subsystem
207 if (pci_initialized) {
208 mutex_lock(&pci_scan_mutex);
209 pcibios_scanbus(hose);
210 mutex_unlock(&pci_scan_mutex);
217 "Skipping PCI bus scan due to resource conflict\n");
220 static int __init pcibios_init(void)
222 struct pci_controller *hose;
224 /* Scan all of the recorded PCI controllers. */
225 list_for_each_entry(hose, &controllers, list)
226 pcibios_scanbus(hose);
228 pci_fixup_irqs(pci_common_swizzle, pcibios_map_irq);
235 subsys_initcall(pcibios_init);
237 static int pcibios_enable_resources(struct pci_dev *dev, int mask)
243 pci_read_config_word(dev, PCI_COMMAND, &cmd);
245 for (idx=0; idx < PCI_NUM_RESOURCES; idx++) {
246 /* Only set up the requested stuff */
247 if (!(mask & (1<<idx)))
250 r = &dev->resource[idx];
251 if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
253 if ((idx == PCI_ROM_RESOURCE) &&
254 (!(r->flags & IORESOURCE_ROM_ENABLE)))
256 if (!r->start && r->end) {
257 printk(KERN_ERR "PCI: Device %s not available "
258 "because of resource collisions\n",
262 if (r->flags & IORESOURCE_IO)
263 cmd |= PCI_COMMAND_IO;
264 if (r->flags & IORESOURCE_MEM)
265 cmd |= PCI_COMMAND_MEMORY;
267 if (cmd != old_cmd) {
268 printk("PCI: Enabling device %s (%04x -> %04x)\n",
269 pci_name(dev), old_cmd, cmd);
270 pci_write_config_word(dev, PCI_COMMAND, cmd);
275 int pcibios_enable_device(struct pci_dev *dev, int mask)
279 if ((err = pcibios_enable_resources(dev, mask)) < 0)
282 return pcibios_plat_dev_init(dev);
285 void pcibios_fixup_bus(struct pci_bus *bus)
287 struct pci_dev *dev = bus->self;
289 if (pci_has_flag(PCI_PROBE_ONLY) && dev &&
290 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
291 pci_read_bridge_bases(bus);
295 char * (*pcibios_plat_setup)(char *str) __initdata;
297 char *__init pcibios_setup(char *str)
299 if (pcibios_plat_setup)
300 return pcibios_plat_setup(str);