diff options
Diffstat (limited to 'drivers/pci/setup-bus.c')
-rw-r--r-- | drivers/pci/setup-bus.c | 39 |
1 files changed, 31 insertions, 8 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 561e41c..fdb1177 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -469,16 +469,23 @@ static void pci_setup_bridge_io(struct pci_bus *bus) struct pci_dev *bridge = bus->self; struct resource *res; struct pci_bus_region region; + unsigned long io_mask; + u8 io_base_lo, io_limit_lo; u32 l, io_upper16; + io_mask = PCI_IO_RANGE_MASK; + if (bridge->io_window_1k) + io_mask = PCI_IO_1K_RANGE_MASK; + /* Set up the top and bottom of the PCI I/O segment for this bus. */ res = bus->resource[0]; pcibios_resource_to_bus(bridge, ®ion, res); if (res->flags & IORESOURCE_IO) { pci_read_config_dword(bridge, PCI_IO_BASE, &l); l &= 0xffff0000; - l |= (region.start >> 8) & 0x00f0; - l |= region.end & 0xf000; + io_base_lo = (region.start >> 8) & io_mask; + io_limit_lo = (region.end >> 8) & io_mask; + l |= ((u32) io_limit_lo << 8) | io_base_lo; /* Set up upper 16 bits of I/O base/limit. */ io_upper16 = (region.end & 0xffff0000) | (region.start >> 16); dev_info(&bridge->dev, " bridge window %pR\n", res); @@ -699,7 +706,7 @@ static resource_size_t calculate_memsize(resource_size_t size, * @realloc_head : track the additional io window on this list * * Sizing the IO windows of the PCI-PCI bridge is trivial, - * since these windows have 4K granularity and the IO ranges + * since these windows have 1K or 4K granularity and the IO ranges * of non-bridge PCI devices are limited to 256 bytes. * We must be careful with the ISA aliasing though. */ @@ -710,10 +717,17 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size, struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO); unsigned long size = 0, size0 = 0, size1 = 0; resource_size_t children_add_size = 0; + resource_size_t min_align = 4096, align; if (!b_res) return; + /* + * Per spec, I/O windows are 4K-aligned, but some bridges have an + * extension to support 1K alignment. + */ + if (bus->self->io_window_1k) + min_align = 1024; list_for_each_entry(dev, &bus->devices, bus_list) { int i; @@ -731,17 +745,25 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size, else size1 += r_size; + align = pci_resource_alignment(dev, r); + if (align > min_align) + min_align = align; + if (realloc_head) children_add_size += get_res_add_size(realloc_head, r); } } + + if (min_align > 4096) + min_align = 4096; + size0 = calculate_iosize(size, min_size, size1, - resource_size(b_res), 4096); + resource_size(b_res), min_align); if (children_add_size > add_size) add_size = children_add_size; size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 : calculate_iosize(size, min_size, add_size + size1, - resource_size(b_res), 4096); + resource_size(b_res), min_align); if (!size0 && !size1) { if (b_res->start || b_res->end) dev_info(&bus->self->dev, "disabling bridge window " @@ -750,12 +772,13 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size, b_res->flags = 0; return; } - /* Alignment of the IO window is always 4K */ - b_res->start = 4096; + + b_res->start = min_align; b_res->end = b_res->start + size0 - 1; b_res->flags |= IORESOURCE_STARTALIGN; if (size1 > size0 && realloc_head) { - add_to_list(realloc_head, bus->self, b_res, size1-size0, 4096); + add_to_list(realloc_head, bus->self, b_res, size1-size0, + min_align); dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window " "%pR to %pR add_size %lx\n", b_res, &bus->busn_res, size1-size0); |