fdt: Added helper to set PCI dma-ranges property
Added fdt_pci_dma_ranges() that parses the pci_region info from the
struct pci_controller and populates the dma-ranges based on it.
The max # of windws/dma-ranges we support is 3 since on embedded
PowerPC based systems this is the max number of windows.
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Andrew Fleming-AFLEMING <afleming@freescale.com>
diff --git a/common/fdt_support.c b/common/fdt_support.c
index f430777..d483d66 100644
--- a/common/fdt_support.c
+++ b/common/fdt_support.c
@@ -620,3 +620,72 @@
return actualsize;
}
+
+#ifdef CONFIG_PCI
+#define CONFIG_SYS_PCI_NR_INBOUND_WIN 3
+
+#define FDT_PCI_PREFETCH (0x40000000)
+#define FDT_PCI_MEM32 (0x02000000)
+#define FDT_PCI_IO (0x01000000)
+#define FDT_PCI_MEM64 (0x03000000)
+
+int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) {
+
+ int addrcell, sizecell, len, r;
+ u32 *dma_range;
+ /* sized based on pci addr cells, size-cells, & address-cells */
+ u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN];
+
+ addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1);
+ sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1);
+
+ dma_range = &dma_ranges[0];
+ for (r = 0; r < hose->region_count; r++) {
+ u64 bus_start, phys_start, size;
+
+ /* skip if !PCI_REGION_MEMORY */
+ if (!(hose->regions[r].flags & PCI_REGION_MEMORY))
+ continue;
+
+ bus_start = (u64)hose->regions[r].bus_start;
+ phys_start = (u64)hose->regions[r].phys_start;
+ size = (u64)hose->regions[r].size;
+
+ dma_range[0] = 0;
+ if (size > 0x100000000ull)
+ dma_range[0] |= FDT_PCI_MEM64;
+ else
+ dma_range[0] |= FDT_PCI_MEM32;
+ if (hose->regions[r].flags & PCI_REGION_PREFETCH)
+ dma_range[0] |= FDT_PCI_PREFETCH;
+#ifdef CONFIG_SYS_PCI_64BIT
+ dma_range[1] = bus_start >> 32;
+#else
+ dma_range[1] = 0;
+#endif
+ dma_range[2] = bus_start & 0xffffffff;
+
+ if (addrcell == 2) {
+ dma_range[3] = phys_start >> 32;
+ dma_range[4] = phys_start & 0xffffffff;
+ } else {
+ dma_range[3] = phys_start & 0xffffffff;
+ }
+
+ if (sizecell == 2) {
+ dma_range[3 + addrcell + 0] = size >> 32;
+ dma_range[3 + addrcell + 1] = size & 0xffffffff;
+ } else {
+ dma_range[3 + addrcell + 0] = size & 0xffffffff;
+ }
+
+ dma_range += (3 + addrcell + sizecell);
+ }
+
+ len = dma_range - &dma_ranges[0];
+ if (len)
+ fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4);
+
+ return 0;
+}
+#endif