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dm: pci: Add a function to find the regions for a PCI bus

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This function looks up the controller and returns a pointer to each region
type.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Simon Glass 2015-11-19 20:27:01 -07:00
parent 9f60fb0db4
commit f9260336d0
2 changed files with 42 additions and 0 deletions
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30
drivers/pci/pci-uclass.c
View file

@ -974,6 +974,36 @@ ulong pci_conv_size_to_32(ulong old, ulong value, uint offset,
return value;
}
int pci_get_regions(struct udevice *dev, struct pci_region **iop,
struct pci_region **memp, struct pci_region **prefp)
{
struct udevice *bus = pci_get_controller(dev);
struct pci_controller *hose = dev_get_uclass_priv(bus);
int i;
*iop = NULL;
*memp = NULL;
*prefp = NULL;
for (i = 0; i < hose->region_count; i++) {
switch (hose->regions[i].flags) {
case PCI_REGION_IO:
if (!*iop || (*iop)->size < hose->regions[i].size)
*iop = hose->regions + i;
break;
case PCI_REGION_MEM:
if (!*memp || (*memp)->size < hose->regions[i].size)
*memp = hose->regions + i;
break;
case (PCI_REGION_MEM | PCI_REGION_PREFETCH):
if (!*prefp || (*prefp)->size < hose->regions[i].size)
*prefp = hose->regions + i;
break;
}
}
return (*iop != NULL) + (*memp != NULL) + (*prefp != NULL);
}
UCLASS_DRIVER(pci) = {
.id = UCLASS_PCI,
.name = "pci",

12
include/pci.h
View file

@ -1130,6 +1130,18 @@ ulong pci_conv_size_to_32(ulong old, ulong value, uint offset,
*/
struct udevice *pci_get_controller(struct udevice *dev);
/**
* pci_get_regions() - obtain pointers to all the region types
*
* @dev: Device to check
* @iop: Returns a pointer to the I/O region, or NULL if none
* @memp: Returns a pointer to the memory region, or NULL if none
* @prefp: Returns a pointer to the pre-fetch region, or NULL if none
* @return the number of non-NULL regions returned, normally 3
*/
int pci_get_regions(struct udevice *dev, struct pci_region **iop,
struct pci_region **memp, struct pci_region **prefp);
/**
* struct dm_pci_emul_ops - PCI device emulator operations
*/