add pci api,the pci/pcie driver writer can use this to get resource o…

…f current device with flag,there are three flag :

1. PCI_BUS_REGION_F_MEM it mean memory space
2. PCI_BUS_REGION_F_IO it mean io space
3. PCI_BUS_REGION_F_PREFETCH it mean prefetchable memory

components/drivers/include/drivers/pci.h

@@ -596,7 +596,7 @@ const struct rt_pci_device_id *rt_pci_match_ids(struct rt_pci_device *pdev,
 
 rt_err_t rt_pci_driver_register(struct rt_pci_driver *pdrv);
 rt_err_t rt_pci_device_register(struct rt_pci_device *pdev);
-
+struct rt_pci_bus_resource *rt_pci_find_bar(struct rt_pci_device* pdev,rt_ubase_t flags,int index);
 #define RT_PCI_DRIVER_EXPORT(driver)    RT_DRIVER_EXPORT(driver, pci, BUILIN)
 
 extern struct rt_spinlock rt_pci_lock;

components/drivers/pci/pci.c

@@ -712,6 +712,20 @@ rt_err_t rt_pci_device_alloc_resource(struct rt_pci_host_bridge *host_bridge,
     return err;
 }
 
+struct rt_pci_bus_resource *rt_pci_find_bar(struct rt_pci_device* pdev,rt_ubase_t flags,int index)
+{
+    for (int i = 0; i < RT_PCI_BAR_NR_MAX; i++)
+    {
+        if (pdev->resource[i].flags == flags)
+        {
+            index--;
+            if (index == 0)
+                return &pdev->resource[i];
+        }
+    }
+    return RT_NULL;
+}
+
 void rt_pci_enum_device(struct rt_pci_bus *bus,
         rt_bool_t (callback(struct rt_pci_device *, void *)), void *data)
 {