dm: pci: Add a function to read a PCI BAR
At present PCI address transaction is not supported so drivers must
manually read the correct BAR after reading the device tree info. The
ns16550 has a suitable implementation, so move this code into the core
DM support.
Note that there is no live-tree equivalent at present.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: correct the unclear comments in test.dts]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/include/dm/fdtaddr.h b/include/dm/fdtaddr.h
index 57b326c..959d3bc 100644
--- a/include/dm/fdtaddr.h
+++ b/include/dm/fdtaddr.h
@@ -138,4 +138,12 @@
fdt_addr_t devfdt_get_addr_size_name(struct udevice *dev, const char *name,
fdt_size_t *size);
+/**
+ * devfdt_get_addr_pci() - Read an address and handle PCI address translation
+ *
+ * @dev: Device to read from
+ * @return address or FDT_ADDR_T_NONE if not found
+ */
+fdt_addr_t devfdt_get_addr_pci(struct udevice *dev);
+
#endif
diff --git a/include/dm/read.h b/include/dm/read.h
index 803daf7..d37fcb5 100644
--- a/include/dm/read.h
+++ b/include/dm/read.h
@@ -249,6 +249,26 @@
void *dev_read_addr_ptr(struct udevice *dev);
/**
+ * dev_read_addr_pci() - Read an address and handle PCI address translation
+ *
+ * At present U-Boot does not have address translation logic for PCI in the
+ * livetree implementation (of_addr.c). This special function supports this for
+ * the flat tree implementation.
+ *
+ * This function should be removed (and code should use dev_read() instead)
+ * once:
+ *
+ * 1. PCI address translation is added; and either
+ * 2. everything uses livetree where PCI translation is used (which is feasible
+ * in SPL and U-Boot proper) or PCI address translation is added to
+ * fdtdec_get_addr() and friends.
+ *
+ * @dev: Device to read from
+ * @return address or FDT_ADDR_T_NONE if not found
+ */
+fdt_addr_t dev_read_addr_pci(struct udevice *dev);
+
+/**
* dev_remap_addr() - Get the reg property of a device as a
* memory-mapped I/O pointer
*
@@ -691,6 +711,11 @@
return devfdt_get_addr_ptr(dev);
}
+static inline fdt_addr_t dev_read_addr_pci(struct udevice *dev)
+{
+ return devfdt_get_addr_pci(dev);
+}
+
static inline void *dev_remap_addr(struct udevice *dev)
{
return devfdt_remap_addr(dev);