From bab17cf143c4888d03eb51f20aa6b86210448608 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Sun, 29 Nov 2015 13:17:53 -0700 Subject: [PATCH] dm: pci: Add a function to read a PCI BAR Add a driver-model function for reading the PCI BAR from a device. Signed-off-by: Simon Glass Reviewed-by: Bin Meng --- 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 dea0cb6e06..7a886f2048 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 443af839b6..dcbe9787a3 100644 --- a/include/pci.h +++ b/include/pci.h @@ -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 * -- 2.25.1