ppc/pnv: add a 'dt_isa_nodename' to the chip

The ISA bus has a different DT nodename on POWER9. Compute the name
when the PnvChip is realized, that is before it is used by the machine
to populate the device tree with the ISA devices.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20190307223548.20516-6-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 5 insertions, 13 deletions

diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 922e3ec48b..6625562d27 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -417,24 +417,12 @@ static int pnv_dt_isa_device(DeviceState *dev, void *opaque)
     return 0;
 }
 
-static int pnv_chip_isa_offset(PnvChip *chip, void *fdt)
-{
-    char *name;
-    int offset;
-
-    name = g_strdup_printf("/xscom@%" PRIx64 "/isa@%x",
-                           (uint64_t) PNV_XSCOM_BASE(chip), PNV_XSCOM_LPC_BASE);
-    offset = fdt_path_offset(fdt, name);
-    g_free(name);
-    return offset;
-}
-
 /* The default LPC bus of a multichip system is on chip 0. It's
  * recognized by the firmware (skiboot) using a "primary" property.
  */
 static void pnv_dt_isa(PnvMachineState *pnv, void *fdt)
 {
-    int isa_offset = pnv_chip_isa_offset(pnv->chips[0], fdt);
+    int isa_offset = fdt_path_offset(fdt, pnv->chips[0]->dt_isa_nodename);
     ForeachPopulateArgs args = {
         .fdt = fdt,
         .offset = isa_offset,
@@ -866,6 +854,10 @@ static void pnv_chip_power8_realize(DeviceState *dev, Error **errp)
                              &error_fatal);
     pnv_xscom_add_subregion(chip, PNV_XSCOM_LPC_BASE, &chip8->lpc.xscom_regs);
 
+    chip->dt_isa_nodename = g_strdup_printf("/xscom@%" PRIx64 "/isa@%x",
+                                            (uint64_t) PNV_XSCOM_BASE(chip),
+                                            PNV_XSCOM_LPC_BASE);
+
     /* Interrupt Management Area. This is the memory region holding
      * all the Interrupt Control Presenter (ICP) registers */
     pnv_chip_icp_realize(chip8, &local_err);