add pci_bus_map_region and pci_map_region macro

Signed-off-by: lipengfei28 <lipengfei28@xiaomi.com>

drivers/pci/pci.c

@@ -1560,6 +1560,33 @@ int pci_select_bars(FAR struct pci_device_s *dev, unsigned int flags)
   return bars;
 }
 
+/****************************************************************************
+ * Name: pci_bus_map_region
+ *
+ * Description:
+ *   Create a virtual mapping for a address.
+ *
+ *   Using this function you will get an virtual address.
+ *   These functions hide the details if this is a MMIO or PIO address
+ *   space and will just do what you expect from them in the correct way.
+ *
+ * Input Parameters:
+ *   bus   - PCI bus
+ *   start - The address base
+ *   size  - The length of the address
+ *
+ * Returned Value:
+ *  Virtual address or zero if failed
+ ****************************************************************************/
+
+FAR void *
+pci_bus_map_region(FAR struct pci_bus_s *bus, uintptr_t start, size_t size)
+{
+  return bus->ctrl->ops->map ?
+    (FAR void *)bus->ctrl->ops->map(bus, start, start + size)
+    : (FAR void *)start;
+}
+
 /****************************************************************************
  * Name: pci_map_bar_region
  *
@@ -1583,16 +1610,8 @@ int pci_select_bars(FAR struct pci_device_s *dev, unsigned int flags)
 FAR void *pci_map_bar_region(FAR struct pci_device_s *dev, int bar,
                              uintptr_t offset, size_t length)
 {
-  FAR struct pci_bus_s *bus = dev->bus;
   uintptr_t start = pci_resource_start(dev, bar) + offset;
-  uintptr_t end = start + length;
-
-  if (bus->ctrl->ops->map)
-    {
-      start = bus->ctrl->ops->map(bus, start, end);
-    }
-
-  return (FAR void *)start;
+  return pci_map_region(dev, start, length);
 }
 
 /****************************************************************************

include/nuttx/pci/pci.h

@@ -207,6 +207,8 @@
 #define pci_read_mmio_dword(dev, addr, val)   \
   (*val) = *((FAR volatile uint32_t *)(addr))
 
+#define pci_map_region(dev, start, size) pci_bus_map_region((dev)->bus, start, size)
+
 /****************************************************************************
  * Public Types
  ****************************************************************************/
@@ -615,6 +617,28 @@ int pci_disable_device(FAR struct pci_device_s *dev);
 
 int pci_select_bars(FAR struct pci_device_s *dev, unsigned int flags);
 
+/****************************************************************************
+ * Name: pci_bus_map_region
+ *
+ * Description:
+ *   Create a virtual mapping for a address.
+ *
+ *   Using this function you will get an virtual address.
+ *   These functions hide the details if this is a MMIO or PIO address
+ *   space and will just do what you expect from them in the correct way.
+ *
+ * Input Parameters:
+ *   bus   - PCI bus
+ *   start - The address base
+ *   size  - The length of the address
+ *
+ * Returned Value:
+ *  Virtual address or zero if failed
+ ****************************************************************************/
+
+FAR void *
+pci_bus_map_region(FAR struct pci_bus_s *bus, uintptr_t start, size_t size);
+
 /****************************************************************************
  * Name: pci_map_bar_region
  *