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 ---
Changes in v2: None
drivers/pci/pci-uclass.c | 13 +++++++++++++ include/pci.h | 9 +++++++++ 2 files changed, 22 insertions(+)
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c index dea0cb6..7a886f2 100644 --- a/drivers/pci/pci-uclass.c +++ b/drivers/pci/pci-uclass.c @@ -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", diff --git a/include/pci.h b/include/pci.h index 443af83..dcbe978 100644 --- a/include/pci.h +++ b/include/pci.h @@ -1167,6 +1167,15 @@ 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 * * @vendor: Vendor ID