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dm: core: Add API to read PCI bus-range property

Add dev_read_pci_bus_range() to read bus-range property values

Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Stefan Roese 3 anos atrás
pai
commit
68f81b8575
2 arquivos alterados com 29 adições e 0 exclusões
  1. 17 0
      drivers/core/read.c
  2. 12 0
      include/dm/read.h

+ 17 - 0
drivers/core/read.c

@@ -10,6 +10,7 @@
 #include <mapmem.h>
 #include <asm/types.h>
 #include <asm/io.h>
+#include <linux/ioport.h>
 
 int dev_read_u32(const struct udevice *dev, const char *propname, u32 *outp)
 {
@@ -359,3 +360,19 @@ int dev_get_child_count(const struct udevice *dev)
 {
 	return ofnode_get_child_count(dev_ofnode(dev));
 }
+
+int dev_read_pci_bus_range(const struct udevice *dev,
+			   struct resource *res)
+{
+	const u32 *values;
+	int len;
+
+	values = dev_read_prop(dev, "bus-range", &len);
+	if (!values || len < sizeof(*values) * 2)
+		return -EINVAL;
+
+	res->start = *values++;
+	res->end = *values;
+
+	return 0;
+}

+ 12 - 0
include/dm/read.h

@@ -680,6 +680,18 @@ int dev_read_alias_highest_id(const char *stem);
  */
 int dev_get_child_count(const struct udevice *dev);
 
+/**
+ * dev_read_pci_bus_range - Read PCI bus-range resource
+ *
+ * Look at the bus range property of a device node and return the pci bus
+ * range for this node.
+ *
+ * @dev: device to examine
+ * @res returns the resource
+ * @return 0 if ok, negative on error
+ */
+int dev_read_pci_bus_range(const struct udevice *dev, struct resource *res);
+
 #else /* CONFIG_DM_DEV_READ_INLINE is enabled */
 
 static inline int dev_read_u32(const struct udevice *dev,