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ARM: move PCI i/o resource setup into common code 

With consolidation of the PCI i/o mappings, the i/o space is being
set to start at a PCI bus addr of 0x0 and fixed to 64K per bus. In
this case the core ARM PCI setup code can setup the i/o resource.

Currently, the resource is only setup if the platform did not setup
an i/o resource.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
hifive-unleashed-5.1
Rob Herring 2012-07-09 21:59:03 -05:00
parent c279443709
commit 3c5d169988
2 changed files with 39 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm/include/asm/mach/pci.h
View File

@ -11,6 +11,7 @@
#ifndef __ASM_MACH_PCI_H
#define __ASM_MACH_PCI_H
#include <linux/ioport.h>
struct pci_sys_data;
struct pci_ops;
@ -43,6 +44,8 @@ struct pci_sys_data {
unsigned long io_offset; /* bus->cpu IO mapping offset */
struct pci_bus *bus; /* PCI bus */
struct list_head resources; /* root bus resources (apertures) */
struct resource io_res;
char io_res_name[12];
/* Bridge swizzling */
u8 (*swizzle)(struct pci_dev *, u8 *);
/* IRQ mapping */

41
arch/arm/kernel/bios32.c
View File

@ -424,6 +424,38 @@ static int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
return irq;
}
static int __init pcibios_init_resources(int busnr, struct pci_sys_data *sys)
{
int ret;
struct pci_host_bridge_window *window;
if (list_empty(&sys->resources)) {
pci_add_resource_offset(&sys->resources,
&iomem_resource, sys->mem_offset);
}
list_for_each_entry(window, &sys->resources, list) {
if (resource_type(window->res) == IORESOURCE_IO)
return 0;
}
sys->io_res.start = (busnr * SZ_64K) ? : pcibios_min_io;
sys->io_res.end = (busnr + 1) * SZ_64K - 1;
sys->io_res.flags = IORESOURCE_IO;
sys->io_res.name = sys->io_res_name;
sprintf(sys->io_res_name, "PCI%d I/O", busnr);
ret = request_resource(&ioport_resource, &sys->io_res);
if (ret) {
pr_err("PCI: unable to allocate I/O port region (%d)\n", ret);
return ret;
}
pci_add_resource_offset(&sys->resources, &sys->io_res,
sys->io_offset);
return 0;
}
static void __init pcibios_init_hw(struct hw_pci *hw, struct list_head *head)
{
struct pci_sys_data *sys = NULL;
@ -446,11 +478,10 @@ static void __init pcibios_init_hw(struct hw_pci *hw, struct list_head *head)
ret = hw->setup(nr, sys);
if (ret > 0) {
if (list_empty(&sys->resources)) {
pci_add_resource_offset(&sys->resources,
&ioport_resource, sys->io_offset);
pci_add_resource_offset(&sys->resources,
&iomem_resource, sys->mem_offset);
ret = pcibios_init_resources(nr, sys);
if (ret) {
kfree(sys);
break;
}
if (hw->scan)