4 * Copyright (c) 2004 - 2009 Paul Mundt
5 * Copyright (c) 2002 M. R. Brown
7 * Modelled after arch/mips/pci/pci.c:
8 * Copyright (C) 2003, 04 Ralf Baechle (ralf@linux-mips.org)
10 * This file is subject to the terms and conditions of the GNU General Public
11 * License. See the file "COPYING" in the main directory of this archive
14 #include <linux/kernel.h>
16 #include <linux/pci.h>
17 #include <linux/init.h>
18 #include <linux/types.h>
19 #include <linux/dma-debug.h>
21 #include <linux/mutex.h>
22 #include <linux/spinlock.h>
23 #include <linux/export.h>
25 unsigned long PCIBIOS_MIN_IO = 0x0000;
26 unsigned long PCIBIOS_MIN_MEM = 0;
29 * The PCI controller list.
31 static struct pci_channel *hose_head, **hose_tail = &hose_head;
33 static int pci_initialized;
35 static void __devinit pcibios_scanbus(struct pci_channel *hose)
37 static int next_busno;
38 static int need_domain_info;
43 for (i = 0; i < hose->nr_resources; i++)
44 pci_add_resource(&resources, hose->resources + i);
46 bus = pci_scan_root_bus(NULL, next_busno, hose->pci_ops, hose,
50 need_domain_info = need_domain_info || hose->index;
51 hose->need_domain_info = need_domain_info;
53 next_busno = bus->subordinate + 1;
54 /* Don't allow 8-bit bus number overflow inside the hose -
55 reserve some space for bridges. */
56 if (next_busno > 224) {
61 pci_bus_size_bridges(bus);
62 pci_bus_assign_resources(bus);
63 pci_enable_bridges(bus);
65 pci_free_resource_list(&resources);
70 * This interrupt-safe spinlock protects all accesses to PCI
71 * configuration space.
73 DEFINE_RAW_SPINLOCK(pci_config_lock);
74 static DEFINE_MUTEX(pci_scan_mutex);
76 int __devinit register_pci_controller(struct pci_channel *hose)
80 for (i = 0; i < hose->nr_resources; i++) {
81 struct resource *res = hose->resources + i;
83 if (res->flags & IORESOURCE_IO) {
84 if (request_resource(&ioport_resource, res) < 0)
87 if (request_resource(&iomem_resource, res) < 0)
93 hose_tail = &hose->next;
96 * Do not panic here but later - this might happen before console init.
98 if (!hose->io_map_base) {
100 "registering PCI controller with io_map_base unset\n");
104 * Setup the ERR/PERR and SERR timers, if available.
106 pcibios_enable_timers(hose);
109 * Scan the bus if it is register after the PCI subsystem
112 if (pci_initialized) {
113 mutex_lock(&pci_scan_mutex);
114 pcibios_scanbus(hose);
115 mutex_unlock(&pci_scan_mutex);
121 for (--i; i >= 0; i--)
122 release_resource(&hose->resources[i]);
124 printk(KERN_WARNING "Skipping PCI bus scan due to resource conflict\n");
128 static int __init pcibios_init(void)
130 struct pci_channel *hose;
132 /* Scan all of the recorded PCI controllers. */
133 for (hose = hose_head; hose; hose = hose->next)
134 pcibios_scanbus(hose);
136 pci_fixup_irqs(pci_common_swizzle, pcibios_map_platform_irq);
138 dma_debug_add_bus(&pci_bus_type);
144 subsys_initcall(pcibios_init);
146 static void pcibios_fixup_device_resources(struct pci_dev *dev,
149 /* Update device resources. */
150 struct pci_channel *hose = bus->sysdata;
151 unsigned long offset = 0;
154 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
155 if (!dev->resource[i].start)
157 if (dev->resource[i].flags & IORESOURCE_IO)
158 offset = hose->io_offset;
159 else if (dev->resource[i].flags & IORESOURCE_MEM)
160 offset = hose->mem_offset;
162 dev->resource[i].start += offset;
163 dev->resource[i].end += offset;
168 * Called after each bus is probed, but before its children
171 void __devinit pcibios_fixup_bus(struct pci_bus *bus)
174 struct list_head *ln;
176 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
179 if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
180 pcibios_fixup_device_resources(dev, bus);
185 * We need to avoid collisions with `mirrored' VGA ports
186 * and other strange ISA hardware, so we always want the
187 * addresses to be allocated in the 0x000-0x0ff region
190 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
191 resource_size_t size, resource_size_t align)
193 struct pci_dev *dev = data;
194 struct pci_channel *hose = dev->sysdata;
195 resource_size_t start = res->start;
197 if (res->flags & IORESOURCE_IO) {
198 if (start < PCIBIOS_MIN_IO + hose->resources[0].start)
199 start = PCIBIOS_MIN_IO + hose->resources[0].start;
202 * Put everything into 0x00-0xff region modulo 0x400.
205 start = (start + 0x3ff) & ~0x3ff;
211 void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
212 struct resource *res)
214 struct pci_channel *hose = dev->sysdata;
215 unsigned long offset = 0;
217 if (res->flags & IORESOURCE_IO)
218 offset = hose->io_offset;
219 else if (res->flags & IORESOURCE_MEM)
220 offset = hose->mem_offset;
222 region->start = res->start - offset;
223 region->end = res->end - offset;
226 void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
227 struct pci_bus_region *region)
229 struct pci_channel *hose = dev->sysdata;
230 unsigned long offset = 0;
232 if (res->flags & IORESOURCE_IO)
233 offset = hose->io_offset;
234 else if (res->flags & IORESOURCE_MEM)
235 offset = hose->mem_offset;
237 res->start = region->start + offset;
238 res->end = region->end + offset;
241 int pcibios_enable_device(struct pci_dev *dev, int mask)
243 return pci_enable_resources(dev, mask);
246 void __init pcibios_update_irq(struct pci_dev *dev, int irq)
248 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
251 char * __devinit __weak pcibios_setup(char *str)
257 pcibios_bus_report_status_early(struct pci_channel *hose,
258 int top_bus, int current_bus,
259 unsigned int status_mask, int warn)
261 unsigned int pci_devfn;
265 for (pci_devfn = 0; pci_devfn < 0xff; pci_devfn++) {
266 if (PCI_FUNC(pci_devfn))
268 ret = early_read_config_word(hose, top_bus, current_bus,
269 pci_devfn, PCI_STATUS, &status);
270 if (ret != PCIBIOS_SUCCESSFUL)
272 if (status == 0xffff)
275 early_write_config_word(hose, top_bus, current_bus,
276 pci_devfn, PCI_STATUS,
277 status & status_mask);
279 printk("(%02x:%02x: %04X) ", current_bus,
285 * We can't use pci_find_device() here since we are
286 * called from interrupt context.
288 static void __init_refok
289 pcibios_bus_report_status(struct pci_bus *bus, unsigned int status_mask,
294 list_for_each_entry(dev, &bus->devices, bus_list) {
298 * ignore host bridge - we handle
301 if (dev->bus->number == 0 && dev->devfn == 0)
304 pci_read_config_word(dev, PCI_STATUS, &status);
305 if (status == 0xffff)
308 if ((status & status_mask) == 0)
311 /* clear the status errors */
312 pci_write_config_word(dev, PCI_STATUS, status & status_mask);
315 printk("(%s: %04X) ", pci_name(dev), status);
318 list_for_each_entry(dev, &bus->devices, bus_list)
319 if (dev->subordinate)
320 pcibios_bus_report_status(dev->subordinate, status_mask, warn);
323 void __init_refok pcibios_report_status(unsigned int status_mask, int warn)
325 struct pci_channel *hose;
327 for (hose = hose_head; hose; hose = hose->next) {
328 if (unlikely(!hose->bus))
329 pcibios_bus_report_status_early(hose, hose_head->index,
330 hose->index, status_mask, warn);
332 pcibios_bus_report_status(hose->bus, status_mask, warn);
336 int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
337 enum pci_mmap_state mmap_state, int write_combine)
340 * I/O space can be accessed via normal processor loads and stores on
341 * this platform but for now we elect not to do this and portable
342 * drivers should not do this anyway.
344 if (mmap_state == pci_mmap_io)
348 * Ignore write-combine; for now only return uncached mappings.
350 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
352 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
353 vma->vm_end - vma->vm_start,
357 #ifndef CONFIG_GENERIC_IOMAP
359 static void __iomem *ioport_map_pci(struct pci_dev *dev,
360 unsigned long port, unsigned int nr)
362 struct pci_channel *chan = dev->sysdata;
364 if (unlikely(!chan->io_map_base)) {
365 chan->io_map_base = sh_io_port_base;
367 if (pci_domains_supported)
368 panic("To avoid data corruption io_map_base MUST be "
369 "set with multiple PCI domains.");
372 return (void __iomem *)(chan->io_map_base + port);
375 void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
379 EXPORT_SYMBOL(pci_iounmap);
381 #endif /* CONFIG_GENERIC_IOMAP */
383 #ifdef CONFIG_HOTPLUG
384 EXPORT_SYMBOL(pcibios_resource_to_bus);
385 EXPORT_SYMBOL(pcibios_bus_to_resource);
386 EXPORT_SYMBOL(PCIBIOS_MIN_IO);
387 EXPORT_SYMBOL(PCIBIOS_MIN_MEM);