2 * Contains common pci routines for ALL ppc platform
3 * (based on pci_32.c and pci_64.c)
5 * Port for PPC64 David Engebretsen, IBM Corp.
6 * Contains common pci routines for ppc64 platform, pSeries and iSeries brands.
8 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
9 * Rework, based on alpha PCI code.
11 * Common pmac/prep/chrp pci routines. -- Cort
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
21 #include <linux/kernel.h>
22 #include <linux/pci.h>
23 #include <linux/string.h>
24 #include <linux/init.h>
25 #include <linux/bootmem.h>
27 #include <linux/list.h>
28 #include <linux/syscalls.h>
29 #include <linux/irq.h>
30 #include <linux/vmalloc.h>
32 #include <asm/processor.h>
35 #include <asm/pci-bridge.h>
36 #include <asm/byteorder.h>
37 #include <asm/machdep.h>
38 #include <asm/ppc-pci.h>
39 #include <asm/firmware.h>
43 #define DBG(fmt...) printk(fmt)
48 static DEFINE_SPINLOCK(hose_spinlock);
50 /* XXX kill that some day ... */
51 int global_phb_number; /* Global phb counter */
53 extern struct list_head hose_list;
56 * pci_controller(phb) initialized common variables.
58 static void __devinit pci_setup_pci_controller(struct pci_controller *hose)
60 memset(hose, 0, sizeof(struct pci_controller));
62 spin_lock(&hose_spinlock);
63 hose->global_number = global_phb_number++;
64 list_add_tail(&hose->list_node, &hose_list);
65 spin_unlock(&hose_spinlock);
68 struct pci_controller * pcibios_alloc_controller(struct device_node *dev)
70 struct pci_controller *phb;
73 phb = kmalloc(sizeof(struct pci_controller), GFP_KERNEL);
75 phb = alloc_bootmem(sizeof (struct pci_controller));
78 pci_setup_pci_controller(phb);
80 phb->is_dynamic = mem_init_done;
83 int nid = of_node_to_nid(dev);
85 if (nid < 0 || !node_online(nid))
88 PHB_SET_NODE(phb, nid);
94 void pcibios_free_controller(struct pci_controller *phb)
96 spin_lock(&hose_spinlock);
97 list_del(&phb->list_node);
98 spin_unlock(&hose_spinlock);
105 * Return the domain number for this bus.
107 int pci_domain_nr(struct pci_bus *bus)
109 if (firmware_has_feature(FW_FEATURE_ISERIES))
112 struct pci_controller *hose = pci_bus_to_host(bus);
114 return hose->global_number;
118 EXPORT_SYMBOL(pci_domain_nr);
122 /* This routine is meant to be used early during boot, when the
123 * PCI bus numbers have not yet been assigned, and you need to
124 * issue PCI config cycles to an OF device.
125 * It could also be used to "fix" RTAS config cycles if you want
126 * to set pci_assign_all_buses to 1 and still use RTAS for PCI
129 struct pci_controller* pci_find_hose_for_OF_device(struct device_node* node)
134 struct pci_controller *hose, *tmp;
135 list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
136 if (hose->arch_data == node)
143 static ssize_t pci_show_devspec(struct device *dev,
144 struct device_attribute *attr, char *buf)
146 struct pci_dev *pdev;
147 struct device_node *np;
149 pdev = to_pci_dev (dev);
150 np = pci_device_to_OF_node(pdev);
151 if (np == NULL || np->full_name == NULL)
153 return sprintf(buf, "%s", np->full_name);
155 static DEVICE_ATTR(devspec, S_IRUGO, pci_show_devspec, NULL);
156 #endif /* CONFIG_PPC_OF */
158 /* Add sysfs properties */
159 int pcibios_add_platform_entries(struct pci_dev *pdev)
162 return device_create_file(&pdev->dev, &dev_attr_devspec);
165 #endif /* CONFIG_PPC_OF */
169 char __init *pcibios_setup(char *str)
175 * Reads the interrupt pin to determine if interrupt is use by card.
176 * If the interrupt is used, then gets the interrupt line from the
177 * openfirmware and sets it in the pci_dev and pci_config line.
179 int pci_read_irq_line(struct pci_dev *pci_dev)
184 DBG("Try to map irq for %s...\n", pci_name(pci_dev));
187 memset(&oirq, 0xff, sizeof(oirq));
189 /* Try to get a mapping from the device-tree */
190 if (of_irq_map_pci(pci_dev, &oirq)) {
193 /* If that fails, lets fallback to what is in the config
194 * space and map that through the default controller. We
195 * also set the type to level low since that's what PCI
196 * interrupts are. If your platform does differently, then
197 * either provide a proper interrupt tree or don't use this
200 if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_PIN, &pin))
204 if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_LINE, &line) ||
208 DBG(" -> no map ! Using irq line %d from PCI config\n", line);
210 virq = irq_create_mapping(NULL, line);
212 set_irq_type(virq, IRQ_TYPE_LEVEL_LOW);
214 DBG(" -> got one, spec %d cells (0x%08x 0x%08x...) on %s\n",
215 oirq.size, oirq.specifier[0], oirq.specifier[1],
216 oirq.controller->full_name);
218 virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
222 DBG(" -> failed to map !\n");
226 DBG(" -> mapped to linux irq %d\n", virq);
232 EXPORT_SYMBOL(pci_read_irq_line);
235 * Platform support for /proc/bus/pci/X/Y mmap()s,
236 * modelled on the sparc64 implementation by Dave Miller.
241 * Adjust vm_pgoff of VMA such that it is the physical page offset
242 * corresponding to the 32-bit pci bus offset for DEV requested by the user.
244 * Basically, the user finds the base address for his device which he wishes
245 * to mmap. They read the 32-bit value from the config space base register,
246 * add whatever PAGE_SIZE multiple offset they wish, and feed this into the
247 * offset parameter of mmap on /proc/bus/pci/XXX for that device.
249 * Returns negative error code on failure, zero on success.
251 static struct resource *__pci_mmap_make_offset(struct pci_dev *dev,
252 resource_size_t *offset,
253 enum pci_mmap_state mmap_state)
255 struct pci_controller *hose = pci_bus_to_host(dev->bus);
256 unsigned long io_offset = 0;
260 return NULL; /* should never happen */
262 /* If memory, add on the PCI bridge address offset */
263 if (mmap_state == pci_mmap_mem) {
264 #if 0 /* See comment in pci_resource_to_user() for why this is disabled */
265 *offset += hose->pci_mem_offset;
267 res_bit = IORESOURCE_MEM;
269 io_offset = (unsigned long)hose->io_base_virt - _IO_BASE;
270 *offset += io_offset;
271 res_bit = IORESOURCE_IO;
275 * Check that the offset requested corresponds to one of the
276 * resources of the device.
278 for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
279 struct resource *rp = &dev->resource[i];
280 int flags = rp->flags;
282 /* treat ROM as memory (should be already) */
283 if (i == PCI_ROM_RESOURCE)
284 flags |= IORESOURCE_MEM;
286 /* Active and same type? */
287 if ((flags & res_bit) == 0)
290 /* In the range of this resource? */
291 if (*offset < (rp->start & PAGE_MASK) || *offset > rp->end)
294 /* found it! construct the final physical address */
295 if (mmap_state == pci_mmap_io)
296 *offset += hose->io_base_phys - io_offset;
304 * Set vm_page_prot of VMA, as appropriate for this architecture, for a pci
307 static pgprot_t __pci_mmap_set_pgprot(struct pci_dev *dev, struct resource *rp,
309 enum pci_mmap_state mmap_state,
312 unsigned long prot = pgprot_val(protection);
314 /* Write combine is always 0 on non-memory space mappings. On
315 * memory space, if the user didn't pass 1, we check for a
316 * "prefetchable" resource. This is a bit hackish, but we use
317 * this to workaround the inability of /sysfs to provide a write
320 if (mmap_state != pci_mmap_mem)
322 else if (write_combine == 0) {
323 if (rp->flags & IORESOURCE_PREFETCH)
327 /* XXX would be nice to have a way to ask for write-through */
328 prot |= _PAGE_NO_CACHE;
330 prot &= ~_PAGE_GUARDED;
332 prot |= _PAGE_GUARDED;
334 return __pgprot(prot);
338 * This one is used by /dev/mem and fbdev who have no clue about the
339 * PCI device, it tries to find the PCI device first and calls the
342 pgprot_t pci_phys_mem_access_prot(struct file *file,
347 struct pci_dev *pdev = NULL;
348 struct resource *found = NULL;
349 unsigned long prot = pgprot_val(protection);
350 unsigned long offset = pfn << PAGE_SHIFT;
353 if (page_is_ram(pfn))
354 return __pgprot(prot);
356 prot |= _PAGE_NO_CACHE | _PAGE_GUARDED;
358 for_each_pci_dev(pdev) {
359 for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
360 struct resource *rp = &pdev->resource[i];
361 int flags = rp->flags;
363 /* Active and same type? */
364 if ((flags & IORESOURCE_MEM) == 0)
366 /* In the range of this resource? */
367 if (offset < (rp->start & PAGE_MASK) ||
377 if (found->flags & IORESOURCE_PREFETCH)
378 prot &= ~_PAGE_GUARDED;
382 DBG("non-PCI map for %lx, prot: %lx\n", offset, prot);
384 return __pgprot(prot);
389 * Perform the actual remap of the pages for a PCI device mapping, as
390 * appropriate for this architecture. The region in the process to map
391 * is described by vm_start and vm_end members of VMA, the base physical
392 * address is found in vm_pgoff.
393 * The pci device structure is provided so that architectures may make mapping
394 * decisions on a per-device or per-bus basis.
396 * Returns a negative error code on failure, zero on success.
398 int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
399 enum pci_mmap_state mmap_state, int write_combine)
401 resource_size_t offset = vma->vm_pgoff << PAGE_SHIFT;
405 rp = __pci_mmap_make_offset(dev, &offset, mmap_state);
409 vma->vm_pgoff = offset >> PAGE_SHIFT;
410 vma->vm_page_prot = __pci_mmap_set_pgprot(dev, rp,
412 mmap_state, write_combine);
414 ret = remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
415 vma->vm_end - vma->vm_start, vma->vm_page_prot);
420 void pci_resource_to_user(const struct pci_dev *dev, int bar,
421 const struct resource *rsrc,
422 resource_size_t *start, resource_size_t *end)
424 struct pci_controller *hose = pci_bus_to_host(dev->bus);
425 resource_size_t offset = 0;
430 if (rsrc->flags & IORESOURCE_IO)
431 offset = (unsigned long)hose->io_base_virt - _IO_BASE;
433 /* We pass a fully fixed up address to userland for MMIO instead of
434 * a BAR value because X is lame and expects to be able to use that
435 * to pass to /dev/mem !
437 * That means that we'll have potentially 64 bits values where some
438 * userland apps only expect 32 (like X itself since it thinks only
439 * Sparc has 64 bits MMIO) but if we don't do that, we break it on
442 * Hopefully, the sysfs insterface is immune to that gunk. Once X
443 * has been fixed (and the fix spread enough), we can re-enable the
444 * 2 lines below and pass down a BAR value to userland. In that case
445 * we'll also have to re-enable the matching code in
446 * __pci_mmap_make_offset().
451 else if (rsrc->flags & IORESOURCE_MEM)
452 offset = hose->pci_mem_offset;
455 *start = rsrc->start - offset;
456 *end = rsrc->end - offset;