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.
7 * Copyright (C) 2003, 04, 11 Ralf Baechle (ralf@linux-mips.org)
8 * Copyright (C) 2011 Wind River Systems,
9 * written by Ralf Baechle (ralf@linux-mips.org)
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.
32 static struct pci_controller *hose_head, **hose_tail = &hose_head;
34 unsigned long PCIBIOS_MIN_IO;
35 unsigned long PCIBIOS_MIN_MEM;
37 static int pci_initialized;
40 * We need to avoid collisions with `mirrored' VGA ports
41 * and other strange ISA hardware, so we always want the
42 * addresses to be allocated in the 0x000-0x0ff region
45 * Why? Because some silly external IO cards only decode
46 * the low 10 bits of the IO address. The 0x00-0xff region
47 * is reserved for motherboard devices that decode all 16
48 * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
49 * but we want to try to avoid allocating at 0x2900-0x2bff
50 * which might have be mirrored at 0x0100-0x03ff..
53 pcibios_align_resource(void *data, const struct resource *res,
54 resource_size_t size, resource_size_t align)
56 struct pci_dev *dev = data;
57 struct pci_controller *hose = dev->sysdata;
58 resource_size_t start = res->start;
60 if (res->flags & IORESOURCE_IO) {
61 /* Make sure we start at our min on all hoses */
62 if (start < PCIBIOS_MIN_IO + hose->io_resource->start)
63 start = PCIBIOS_MIN_IO + hose->io_resource->start;
66 * Put everything into 0x00-0xff region modulo 0x400
69 start = (start + 0x3ff) & ~0x3ff;
70 } else if (res->flags & IORESOURCE_MEM) {
71 /* Make sure we start at our min on all hoses */
72 if (start < PCIBIOS_MIN_MEM + hose->mem_resource->start)
73 start = PCIBIOS_MIN_MEM + hose->mem_resource->start;
79 static void pcibios_scanbus(struct pci_controller *hose)
81 static int next_busno;
82 static int need_domain_info;
87 PCI_DMA_BUS_IS_PHYS = 1;
89 if (hose->get_busno && pci_has_flag(PCI_PROBE_ONLY))
90 next_busno = (*hose->get_busno)();
92 pci_add_resource_offset(&resources,
93 hose->mem_resource, hose->mem_offset);
94 pci_add_resource_offset(&resources,
95 hose->io_resource, hose->io_offset);
96 pci_add_resource_offset(&resources,
97 hose->busn_resource, hose->busn_offset);
98 bus = pci_scan_root_bus(NULL, next_busno, hose->pci_ops, hose,
101 pci_free_resource_list(&resources);
105 need_domain_info = need_domain_info || hose->index;
106 hose->need_domain_info = need_domain_info;
108 next_busno = bus->busn_res.end + 1;
109 /* Don't allow 8-bit bus number overflow inside the hose -
110 reserve some space for bridges. */
111 if (next_busno > 224) {
113 need_domain_info = 1;
116 if (!pci_has_flag(PCI_PROBE_ONLY)) {
117 pci_bus_size_bridges(bus);
118 pci_bus_assign_resources(bus);
124 void pci_load_of_ranges(struct pci_controller *hose, struct device_node *node)
126 struct of_pci_range range;
127 struct of_pci_range_parser parser;
129 pr_info("PCI host bridge %s ranges:\n", node->full_name);
130 hose->of_node = node;
132 if (of_pci_range_parser_init(&parser, node))
135 for_each_of_pci_range(&parser, &range) {
136 struct resource *res = NULL;
138 switch (range.flags & IORESOURCE_TYPE_BITS) {
140 pr_info(" IO 0x%016llx..0x%016llx\n",
142 range.cpu_addr + range.size - 1);
144 (unsigned long)ioremap(range.cpu_addr,
146 res = hose->io_resource;
149 pr_info(" MEM 0x%016llx..0x%016llx\n",
151 range.cpu_addr + range.size - 1);
152 res = hose->mem_resource;
156 of_pci_range_to_resource(&range, node, res);
160 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
162 struct pci_controller *hose = bus->sysdata;
164 return of_node_get(hose->of_node);
168 static DEFINE_MUTEX(pci_scan_mutex);
170 void register_pci_controller(struct pci_controller *hose)
172 struct resource *parent;
174 parent = hose->mem_resource->parent;
176 parent = &iomem_resource;
178 if (request_resource(parent, hose->mem_resource) < 0)
181 parent = hose->io_resource->parent;
183 parent = &ioport_resource;
185 if (request_resource(parent, hose->io_resource) < 0) {
186 release_resource(hose->mem_resource);
191 hose_tail = &hose->next;
194 * Do not panic here but later - this might happen before console init.
196 if (!hose->io_map_base) {
198 "registering PCI controller with io_map_base unset\n");
202 * Scan the bus if it is register after the PCI subsystem
205 if (pci_initialized) {
206 mutex_lock(&pci_scan_mutex);
207 pcibios_scanbus(hose);
208 mutex_unlock(&pci_scan_mutex);
215 "Skipping PCI bus scan due to resource conflict\n");
218 static void __init pcibios_set_cache_line_size(void)
220 struct cpuinfo_mips *c = ¤t_cpu_data;
224 * Set PCI cacheline size to that of the highest level in the
227 lsize = c->dcache.linesz;
228 lsize = c->scache.linesz ? : lsize;
229 lsize = c->tcache.linesz ? : lsize;
233 pci_dfl_cache_line_size = lsize >> 2;
235 pr_debug("PCI: pci_cache_line_size set to %d bytes\n", lsize);
238 static int __init pcibios_init(void)
240 struct pci_controller *hose;
242 pcibios_set_cache_line_size();
244 /* Scan all of the recorded PCI controllers. */
245 for (hose = hose_head; hose; hose = hose->next)
246 pcibios_scanbus(hose);
248 pci_fixup_irqs(pci_common_swizzle, pcibios_map_irq);
255 subsys_initcall(pcibios_init);
257 static int pcibios_enable_resources(struct pci_dev *dev, int mask)
263 pci_read_config_word(dev, PCI_COMMAND, &cmd);
265 for (idx=0; idx < PCI_NUM_RESOURCES; idx++) {
266 /* Only set up the requested stuff */
267 if (!(mask & (1<<idx)))
270 r = &dev->resource[idx];
271 if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
273 if ((idx == PCI_ROM_RESOURCE) &&
274 (!(r->flags & IORESOURCE_ROM_ENABLE)))
276 if (!r->start && r->end) {
277 printk(KERN_ERR "PCI: Device %s not available "
278 "because of resource collisions\n",
282 if (r->flags & IORESOURCE_IO)
283 cmd |= PCI_COMMAND_IO;
284 if (r->flags & IORESOURCE_MEM)
285 cmd |= PCI_COMMAND_MEMORY;
287 if (cmd != old_cmd) {
288 printk("PCI: Enabling device %s (%04x -> %04x)\n",
289 pci_name(dev), old_cmd, cmd);
290 pci_write_config_word(dev, PCI_COMMAND, cmd);
295 unsigned int pcibios_assign_all_busses(void)
300 int pcibios_enable_device(struct pci_dev *dev, int mask)
304 if ((err = pcibios_enable_resources(dev, mask)) < 0)
307 return pcibios_plat_dev_init(dev);
310 void pcibios_fixup_bus(struct pci_bus *bus)
312 struct pci_dev *dev = bus->self;
314 if (pci_has_flag(PCI_PROBE_ONLY) && dev &&
315 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
316 pci_read_bridge_bases(bus);
320 EXPORT_SYMBOL(PCIBIOS_MIN_IO);
321 EXPORT_SYMBOL(PCIBIOS_MIN_MEM);
323 int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
324 enum pci_mmap_state mmap_state, int write_combine)
329 * I/O space can be accessed via normal processor loads and stores on
330 * this platform but for now we elect not to do this and portable
331 * drivers should not do this anyway.
333 if (mmap_state == pci_mmap_io)
337 * Ignore write-combine; for now only return uncached mappings.
339 prot = pgprot_val(vma->vm_page_prot);
340 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
341 vma->vm_page_prot = __pgprot(prot);
343 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
344 vma->vm_end - vma->vm_start, vma->vm_page_prot);
347 char * (*pcibios_plat_setup)(char *str) __initdata;
349 char *__init pcibios_setup(char *str)
351 if (pcibios_plat_setup)
352 return pcibios_plat_setup(str);