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 <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index dea0cb6e06b70416497e90cf80cbb237695659f2..7a886f204813a3ee4834787bcad94b94b32b3259 100644 (file)
--- 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 443af839b6c846f94b10e107ac117d9d152f2f68..dcbe9787a3f0ac458897865f3f175e73a3b5c86d 100644 (file)
--- 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
  *