drivers: pci: add api to get dma regions

Add api to get dma regions.

Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>

diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index 834526c..40cc9f1 100644 (file)
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -1179,6 +1179,48 @@ ulong pci_conv_size_to_32(ulong old, ulong value, uint offset,
        return value;
 }
 
+int pci_get_dma_regions(struct udevice *dev, struct pci_region *memp, int index)
+{
+       int pci_addr_cells, addr_cells, size_cells;
+       int cells_per_record;
+       const u32 *prop;
+       int len;
+       int i = 0;
+
+       prop = ofnode_get_property(dev_ofnode(dev), "dma-ranges", &len);
+       if (!prop) {
+               log_err("PCI: Device '%s': Cannot decode dma-ranges\n",
+                       dev->name);
+               return -EINVAL;
+       }
+
+       pci_addr_cells = ofnode_read_simple_addr_cells(dev_ofnode(dev));
+       addr_cells = ofnode_read_simple_addr_cells(dev_ofnode(dev->parent));
+       size_cells = ofnode_read_simple_size_cells(dev_ofnode(dev));
+
+       /* PCI addresses are always 3-cells */
+       len /= sizeof(u32);
+       cells_per_record = pci_addr_cells + addr_cells + size_cells;
+       debug("%s: len=%d, cells_per_record=%d\n", __func__, len,
+             cells_per_record);
+
+       while (len) {
+               memp->bus_start = fdtdec_get_number(prop + 1, 2);
+               prop += pci_addr_cells;
+               memp->phys_start = fdtdec_get_number(prop, addr_cells);
+               prop += addr_cells;
+               memp->size = fdtdec_get_number(prop, size_cells);
+               prop += size_cells;
+
+               if (i == index)
+                       return 0;
+               i++;
+               len -= cells_per_record;
+       }
+
+       return -EINVAL;
+}
+
 int pci_get_regions(struct udevice *dev, struct pci_region **iop,
                    struct pci_region **memp, struct pci_region **prefp)
 {

diff --git a/include/pci.h b/include/pci.h
index 281f353..2089db9 100644 (file)
--- a/include/pci.h
+++ b/include/pci.h
@@ -1315,7 +1315,8 @@ struct udevice *pci_get_controller(struct udevice *dev);
  */
 int pci_get_regions(struct udevice *dev, struct pci_region **iop,
                    struct pci_region **memp, struct pci_region **prefp);
-
+int
+pci_get_dma_regions(struct udevice *dev, struct pci_region *memp, int index);
 /**
  * dm_pci_write_bar32() - Write the address of a BAR
  *