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| author | Bjorn Helgaas <bhelgaas@google.com> | 2016-06-21 17:54:29 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2016-06-21 17:54:29 +0200 |
| commit | 1fa051018d85b829e4b9a7ed20147df8760293ee (patch) | |
| tree | 6a324aaed509fd326635df88fae8f20b371dad00 /arch/arm/kernel | |
| parent | PCI: mvebu: Request host bridge window resources with core function (diff) | |
| download | linux-1fa051018d85b829e4b9a7ed20147df8760293ee.tar.xz linux-1fa051018d85b829e4b9a7ed20147df8760293ee.zip | |
ARM: Make PCI I/O space optional
For callers of pci_common_init_dev(), we previously always required a PCI
I/O port resource. If the caller's ->setup() function had added an I/O
resource, we used that; otherwise, we added a default 64K I/O port space
for it.
There are PCI host bridges that do not support I/O port space, and we
should not add fictitious spaces for them.
If a caller sets struct hw_pci.io_optional, assume it is responsible for
adding any I/O port resource it desires, and do not add any default I/O
port space.
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/bios32.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c index 05e61a2eeabe..65f12ef6aa62 100644 --- a/arch/arm/kernel/bios32.c +++ b/arch/arm/kernel/bios32.c @@ -410,7 +410,8 @@ static int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) return irq; } -static int pcibios_init_resources(int busnr, struct pci_sys_data *sys) +static int pcibios_init_resource(int busnr, struct pci_sys_data *sys, + int io_optional) { int ret; struct resource_entry *window; @@ -420,6 +421,14 @@ static int pcibios_init_resources(int busnr, struct pci_sys_data *sys) &iomem_resource, sys->mem_offset); } + /* + * If a platform says I/O port support is optional, we don't add + * the default I/O space. The platform is responsible for adding + * any I/O space it needs. + */ + if (io_optional) + return 0; + resource_list_for_each_entry(window, &sys->resources) if (resource_type(window->res) == IORESOURCE_IO) return 0; @@ -466,7 +475,7 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw, if (ret > 0) { struct pci_host_bridge *host_bridge; - ret = pcibios_init_resources(nr, sys); + ret = pcibios_init_resource(nr, sys, hw->io_optional); if (ret) { kfree(sys); break; |