Add a driver-model function for reading the PCI BAR from a device.
Signed-off-by: Simon Glass <s...@chromium.org>
Reviewed-by: Bin Meng <bmeng...@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
--
2.6.0.rc2.230.g3dd15c0
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