/* * Contains common pci routines for ALL ppc platform * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #undef DEBUG #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef DEBUG #include #define DBG(fmt...) printk(fmt) #else #define DBG(fmt...) #endif /* * Return the domain number for this bus. */ int pci_domain_nr(struct pci_bus *bus) { if (firmware_has_feature(FW_FEATURE_ISERIES)) return 0; else { struct pci_controller *hose = pci_bus_to_host(bus); return hose->global_number; } } EXPORT_SYMBOL(pci_domain_nr); #ifdef CONFIG_PPC_OF static ssize_t pci_show_devspec(struct device *dev, struct device_attribute *attr, char *buf) { struct pci_dev *pdev; struct device_node *np; pdev = to_pci_dev (dev); np = pci_device_to_OF_node(pdev); if (np == NULL || np->full_name == NULL) return 0; return sprintf(buf, "%s", np->full_name); } static DEVICE_ATTR(devspec, S_IRUGO, pci_show_devspec, NULL); #endif /* CONFIG_PPC_OF */ /* Add sysfs properties */ void pcibios_add_platform_entries(struct pci_dev *pdev) { #ifdef CONFIG_PPC_OF device_create_file(&pdev->dev, &dev_attr_devspec); #endif /* CONFIG_PPC_OF */ } char __init *pcibios_setup(char *str) { return str; } /* * Reads the interrupt pin to determine if interrupt is use by card. * If the interrupt is used, then gets the interrupt line from the * openfirmware and sets it in the pci_dev and pci_config line. */ int pci_read_irq_line(struct pci_dev *pci_dev) { struct of_irq oirq; unsigned int virq; DBG("Try to map irq for %s...\n", pci_name(pci_dev)); #ifdef DEBUG memset(&oirq, 0xff, sizeof(oirq)); #endif /* Try to get a mapping from the device-tree */ if (of_irq_map_pci(pci_dev, &oirq)) { u8 line, pin; /* If that fails, lets fallback to what is in the config * space and map that through the default controller. We * also set the type to level low since that's what PCI * interrupts are. If your platform does differently, then * either provide a proper interrupt tree or don't use this * function. */ if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_PIN, &pin)) return -1; if (pin == 0) return -1; if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_LINE, &line) || line == 0xff) { return -1; } DBG(" -> no map ! Using irq line %d from PCI config\n", line); virq = irq_create_mapping(NULL, line); if (virq != NO_IRQ) set_irq_type(virq, IRQ_TYPE_LEVEL_LOW); } else { DBG(" -> got one, spec %d cells (0x%08x 0x%08x...) on %s\n", oirq.size, oirq.specifier[0], oirq.specifier[1], oirq.controller->full_name); virq = irq_create_of_mapping(oirq.controller, oirq.specifier, oirq.size); } if(virq == NO_IRQ) { DBG(" -> failed to map !\n"); return -1; } DBG(" -> mapped to linux irq %d\n", virq); pci_dev->irq = virq; return 0; } EXPORT_SYMBOL(pci_read_irq_line); /* * Platform support for /proc/bus/pci/X/Y mmap()s, * modelled on the sparc64 implementation by Dave Miller. * -- paulus. */ /* * Adjust vm_pgoff of VMA such that it is the physical page offset * corresponding to the 32-bit pci bus offset for DEV requested by the user. * * Basically, the user finds the base address for his device which he wishes * to mmap. They read the 32-bit value from the config space base register, * add whatever PAGE_SIZE multiple offset they wish, and feed this into the * offset parameter of mmap on /proc/bus/pci/XXX for that device. * * Returns negative error code on failure, zero on success. */ static struct resource *__pci_mmap_make_offset(struct pci_dev *dev, resource_size_t *offset, enum pci_mmap_state mmap_state) { struct pci_controller *hose = pci_bus_to_host(dev->bus); unsigned long io_offset = 0; int i, res_bit; if (hose == 0) return NULL; /* should never happen */ /* If memory, add on the PCI bridge address offset */ if (mmap_state == pci_mmap_mem) { #if 0 /* See comment in pci_resource_to_user() for why this is disabled */ *offset += hose->pci_mem_offset; #endif res_bit = IORESOURCE_MEM; } else { io_offset = (unsigned long)hose->io_base_virt - _IO_BASE; *offset += io_offset; res_bit = IORESOURCE_IO; } /* * Check that the offset requested corresponds to one of the * resources of the device. */ for (i = 0; i <= PCI_ROM_RESOURCE; i++) { struct resource *rp = &dev->resource[i]; int flags = rp->flags; /* treat ROM as memory (should be already) */ if (i == PCI_ROM_RESOURCE) flags |= IORESOURCE_MEM; /* Active and same type? */ if ((flags & res_bit) == 0) continue; /* In the range of this resource? */ if (*offset < (rp->start & PAGE_MASK) || *offset > rp->end) continue; /* found it! construct the final physical address */ if (mmap_state == pci_mmap_io) *offset += hose->io_base_phys - io_offset; return rp; } return NULL; } /* * Set vm_page_prot of VMA, as appropriate for this architecture, for a pci * device mapping. */ static pgprot_t __pci_mmap_set_pgprot(struct pci_dev *dev, struct resource *rp, pgprot_t protection, enum pci_mmap_state mmap_state, int write_combine) { unsigned long prot = pgprot_val(protection); /* Write combine is always 0 on non-memory space mappings. On * memory space, if the user didn't pass 1, we check for a * "prefetchable" resource. This is a bit hackish, but we use * this to workaround the inability of /sysfs to provide a write * combine bit */ if (mmap_state != pci_mmap_mem) write_combine = 0; else if (write_combine == 0) { if (rp->flags & IORESOURCE_PREFETCH) write_combine = 1; } /* XXX would be nice to have a way to ask for write-through */ prot |= _PAGE_NO_CACHE; if (write_combine) prot &= ~_PAGE_GUARDED; else prot |= _PAGE_GUARDED; return __pgprot(prot); } /* * This one is used by /dev/mem and fbdev who have no clue about the * PCI device, it tries to find the PCI device first and calls the * above routine */ pgprot_t pci_phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size, pgprot_t protection) { struct pci_dev *pdev = NULL; struct resource *found = NULL; unsigned long prot = pgprot_val(protection); unsigned long offset = pfn << PAGE_SHIFT; int i; if (page_is_ram(pfn)) return __pgprot(prot); prot |= _PAGE_NO_CACHE | _PAGE_GUARDED; for_each_pci_dev(pdev) { for (i = 0; i <= PCI_ROM_RESOURCE; i++) { struct resource *rp = &pdev->resource[i]; int flags = rp->flags; /* Active and same type? */ if ((flags & IORESOURCE_MEM) == 0) continue; /* In the range of this resource? */ if (offset < (rp->start & PAGE_MASK) || offset > rp->end) continue; found = rp; break; } if (found) break; } if (found) { if (found->flags & IORESOURCE_PREFETCH) prot &= ~_PAGE_GUARDED; pci_dev_put(pdev); } DBG("non-PCI map for %lx, prot: %lx\n", offset, prot); return __pgprot(prot); } /* * Perform the actual remap of the pages for a PCI device mapping, as * appropriate for this architecture. The region in the process to map * is described by vm_start and vm_end members of VMA, the base physical * address is found in vm_pgoff. * The pci device structure is provided so that architectures may make mapping * decisions on a per-device or per-bus basis. * * Returns a negative error code on failure, zero on success. */ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, enum pci_mmap_state mmap_state, int write_combine) { resource_size_t offset = vma->vm_pgoff << PAGE_SHIFT; struct resource *rp; int ret; rp = __pci_mmap_make_offset(dev, &offset, mmap_state); if (rp == NULL) return -EINVAL; vma->vm_pgoff = offset >> PAGE_SHIFT; vma->vm_page_prot = __pci_mmap_set_pgprot(dev, rp, vma->vm_page_prot, mmap_state, write_combine); ret = remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, vma->vm_end - vma->vm_start, vma->vm_page_prot); return ret; } void pci_resource_to_user(const struct pci_dev *dev, int bar, const struct resource *rsrc, resource_size_t *start, resource_size_t *end) { struct pci_controller *hose = pci_bus_to_host(dev->bus); resource_size_t offset = 0; if (hose == NULL) return; if (rsrc->flags & IORESOURCE_IO) offset = (unsigned long)hose->io_base_virt - _IO_BASE; /* We pass a fully fixed up address to userland for MMIO instead of * a BAR value because X is lame and expects to be able to use that * to pass to /dev/mem ! * * That means that we'll have potentially 64 bits values where some * userland apps only expect 32 (like X itself since it thinks only * Sparc has 64 bits MMIO) but if we don't do that, we break it on * 32 bits CHRPs :-( * * Hopefully, the sysfs insterface is immune to that gunk. Once X * has been fixed (and the fix spread enough), we can re-enable the * 2 lines below and pass down a BAR value to userland. In that case * we'll also have to re-enable the matching code in * __pci_mmap_make_offset(). * * BenH. */ #if 0 else if (rsrc->flags & IORESOURCE_MEM) offset = hose->pci_mem_offset; #endif *start = rsrc->start - offset; *end = rsrc->end - offset; }