drivers: pci: add map_bar support for Enhanced Allocation
Makes dm_pci_map_bar API available for integrated PCI devices that
support Enhanced Allocation instead of the original PCI BAR mechanism.
Signed-off-by: Alex Marginean <alexm.osslist@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index cf1e761..389aec1 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -1341,10 +1341,56 @@
return bus_addr;
}
+static void *dm_pci_map_ea_bar(struct udevice *dev, int bar, int flags,
+ int ea_off)
+{
+ int ea_cnt, i, entry_size;
+ int bar_id = (bar - PCI_BASE_ADDRESS_0) >> 2;
+ u32 ea_entry;
+ phys_addr_t addr;
+
+ /* EA capability structure header */
+ dm_pci_read_config32(dev, ea_off, &ea_entry);
+ ea_cnt = (ea_entry >> 16) & PCI_EA_NUM_ENT_MASK;
+ ea_off += PCI_EA_FIRST_ENT;
+
+ for (i = 0; i < ea_cnt; i++, ea_off += entry_size) {
+ /* Entry header */
+ dm_pci_read_config32(dev, ea_off, &ea_entry);
+ entry_size = ((ea_entry & PCI_EA_ES) + 1) << 2;
+
+ if (((ea_entry & PCI_EA_BEI) >> 4) != bar_id)
+ continue;
+
+ /* Base address, 1st DW */
+ dm_pci_read_config32(dev, ea_off + 4, &ea_entry);
+ addr = ea_entry & PCI_EA_FIELD_MASK;
+ if (ea_entry & PCI_EA_IS_64) {
+ /* Base address, 2nd DW, skip over 4B MaxOffset */
+ dm_pci_read_config32(dev, ea_off + 12, &ea_entry);
+ addr |= ((u64)ea_entry) << 32;
+ }
+
+ /* size ignored for now */
+ return map_physmem(addr, flags, 0);
+ }
+
+ return 0;
+}
+
void *dm_pci_map_bar(struct udevice *dev, int bar, int flags)
{
pci_addr_t pci_bus_addr;
u32 bar_response;
+ int ea_off;
+
+ /*
+ * if the function supports Enhanced Allocation use that instead of
+ * BARs
+ */
+ ea_off = dm_pci_find_capability(dev, PCI_CAP_ID_EA);
+ if (ea_off)
+ return dm_pci_map_ea_bar(dev, bar, flags, ea_off);
/* read BAR address */
dm_pci_read_config32(dev, bar, &bar_response);