[U-Boot] [PATCH 06/25] dm: pci: Add a function to read a PCI BAR

[Simon Glass]

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

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 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 929d772..4e37972 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -1053,6 +1053,19 @@ 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 d4f6e02..f1c0d71 100644
--- a/include/pci.h
+++ b/include/pci.h
@@ -1174,6 +1174,15 @@ int dm_pciauto_config_device(struct udevice *dev);
 void dm_pciauto_region_init(struct pci_region *res);
 
 /**
+ * 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