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dm: pci: Add a function to read a PCI BAR

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Add a driver-model function for reading the PCI BAR from a device.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2015-11-29 13:17:53 -07:00
parent a0eb835635
commit bab17cf143
2 changed files with 22 additions and 0 deletions
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13
drivers/pci/pci-uclass.c
View File

@ -1055,6 +1055,19 @@ int pci_get_regions(struct udevice *dev, struct pci_region **iop,
return (*iop != NULL) + (*memp != NULL) + (*prefp != NULL);
}
u32 dm_pci_read_bar32(struct udevice *dev, int barnum)
{
u32 addr;
int bar;
bar = PCI_BASE_ADDRESS_0 + barnum * 4;
dm_pci_read_config32(dev, bar, &addr);
if (addr & PCI_BASE_ADDRESS_SPACE_IO)
return addr & PCI_BASE_ADDRESS_IO_MASK;
else
return addr & PCI_BASE_ADDRESS_MEM_MASK;
}
UCLASS_DRIVER(pci) = {
.id = UCLASS_PCI,
.name = "pci",

9
include/pci.h
View File

@ -1166,6 +1166,15 @@ struct udevice *pci_get_controller(struct udevice *dev);
int pci_get_regions(struct udevice *dev, struct pci_region **iop,
struct pci_region **memp, struct pci_region **prefp);
/**
* dm_pci_read_bar32() - read a base address register from a device
*
* @dev: Device to check
* @barnum: Bar number to read (numbered from 0)
* @return: value of BAR
*/
u32 dm_pci_read_bar32(struct udevice *dev, int barnum);
/**
* dm_pci_find_device() - find a device by vendor/device ID
*