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ARM: Make PCI I/O space optional

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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>
This commit is contained in:
Bjorn Helgaas 2016-06-21 10:54:29 -05:00
parent 6df68f22df
commit 1fa051018d
2 changed files with 12 additions and 2 deletions
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1
arch/arm/include/asm/mach/pci.h
View File

@ -22,6 +22,7 @@ struct hw_pci {
struct msi_controller *msi_ctrl;
struct pci_ops *ops;
int nr_controllers;
unsigned int io_optional:1;
void **private_data;
int (*setup)(int nr, struct pci_sys_data *);
struct pci_bus *(*scan)(int nr, struct pci_sys_data *);

13
arch/arm/kernel/bios32.c
View File

@ -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;