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| author | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2013-03-26 21:14:24 +0400 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-04-03 19:56:11 +0400 |
| commit | 029baf14a027a44b3ac8a9fe5cb1e516cbb9007e (patch) | |
| tree | 5d60490910a4015db3690f10ddaa64c7aaf6a7d5 /arch/arm/kernel/bios32.c | |
| parent | 01223f365074d62bbc24709dad9b4a905206fa02 (diff) | |
| download | linux-029baf14a027a44b3ac8a9fe5cb1e516cbb9007e.tar.xz | |
ARM: 7683/1: pci: add a align_resource hook
The PCI specifications says that an I/O region must be aligned on a 4
KB boundary, and a memory region aligned on a 1 MB boundary.
However, the Marvell PCIe interfaces rely on address decoding windows
(which allow to associate a range of physical addresses with a given
device). For PCIe memory windows, those windows are defined with a 1
MB granularity (which matches the PCI specs), but PCIe I/O windows can
only be defined with a 64 KB granularity, so they have to be 64 KB
aligned. We therefore need to tell the PCI core about this special
alignement requirement.
The PCI core already calls pcibios_align_resource() in the ARM PCI
core, specifically for such purposes. So this patch extends the ARM
PCI core so that it calls a ->align_resource() hook registered by the
PCI driver, exactly like the existing ->map_irq() and ->swizzle()
hooks.
A particular PCI driver can register a align_resource() hook, and do
its own specific alignement, depending on the specific constraints of
the underlying hardware.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/bios32.c')
| -rw-r--r-- | arch/arm/kernel/bios32.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c index a1f73b502ef0..b2ed73c45489 100644 --- a/arch/arm/kernel/bios32.c +++ b/arch/arm/kernel/bios32.c @@ -462,6 +462,7 @@ static void pcibios_init_hw(struct hw_pci *hw, struct list_head *head) sys->busnr = busnr; sys->swizzle = hw->swizzle; sys->map_irq = hw->map_irq; + sys->align_resource = hw->align_resource; INIT_LIST_HEAD(&sys->resources); if (hw->private_data) @@ -574,6 +575,8 @@ char * __init pcibios_setup(char *str) resource_size_t pcibios_align_resource(void *data, const struct resource *res, resource_size_t size, resource_size_t align) { + struct pci_dev *dev = data; + struct pci_sys_data *sys = dev->sysdata; resource_size_t start = res->start; if (res->flags & IORESOURCE_IO && start & 0x300) @@ -581,6 +584,9 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res, start = (start + align - 1) & ~(align - 1); + if (sys->align_resource) + return sys->align_resource(dev, res, start, size, align); + return start; } |