powerpc/pseries/npu: Enable platform support

We already changed NPU API for GPUs to not to call OPAL and the remaining
bit is initializing NPU structures.

This searches for POWER9 NVLinks attached to any device on a PHB and
initializes an NPU structure if any found.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/platforms/pseries/pci.c

@@ -29,6 +29,7 @@
 #include <asm/pci-bridge.h>
 #include <asm/prom.h>
 #include <asm/ppc-pci.h>
+#include <asm/pci.h>
 #include "pseries.h"
 
 #if 0
@@ -237,6 +238,8 @@ static void __init pSeries_request_regions(void)
 
 void __init pSeries_final_fixup(void)
 {
+	struct pci_controller *hose;
+
 	pSeries_request_regions();
 
 	eeh_probe_devices();
@@ -246,6 +249,25 @@ void __init pSeries_final_fixup(void)
 	ppc_md.pcibios_sriov_enable = pseries_pcibios_sriov_enable;
 	ppc_md.pcibios_sriov_disable = pseries_pcibios_sriov_disable;
 #endif
+	list_for_each_entry(hose, &hose_list, list_node) {
+		struct device_node *dn = hose->dn, *nvdn;
+
+		while (1) {
+			dn = of_find_all_nodes(dn);
+			if (!dn)
+				break;
+			nvdn = of_parse_phandle(dn, "ibm,nvlink", 0);
+			if (!nvdn)
+				continue;
+			if (!of_device_is_compatible(nvdn, "ibm,npu-link"))
+				continue;
+			if (!of_device_is_compatible(nvdn->parent,
+						"ibm,power9-npu"))
+				continue;
+			WARN_ON_ONCE(pnv_npu2_init(hose));
+			break;
+		}
+	}
 }
 
 /*