From: Srinath Mannam <srinath.man...@broadcom.com>
Add API to parse dma-regions given in PCIe host controller
DT node.
Signed-off-by: Srinath Mannam <srinath.man...@broadcom.com>
Signed-off-by: Vladimir Olovyannikov <vladimir.olovyanni...@broadcom.com>
---
drivers/pci/pci-uclass.c | 41 ++++++++++++++++++++++++++++++++++++++++
include/pci.h | 2 ++
2 files changed, 43 insertions(+)
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index eb7a01fd55..ddc2d5cf2c 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -1166,6 +1166,47 @@ 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) {
+ dev_err(dev, "%s: Cannot decode dma-ranges\n", __func__);
+ 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 ff59ac0e69..ef55f54ea5 100644
--- a/include/pci.h
+++ b/include/pci.h
@@ -1284,6 +1284,8 @@ 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
*
--
2.17.1
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