ppc/pnv: Implement the ChipTOD to Core transfer

One of the functions of the ChipTOD is to transfer TOD to the Core
(aka PC - Pervasive Core) timebase facility.

The ChipTOD can be programmed with a target address to send the TOD
value to. The hardware implementation seems to perform this by
sending the TOD value to a SCOM address.

This implementation grabs the core directly and manipulates the
timebase facility state in the core. This is a hack, but it works
enough for now. A better implementation would implement the transfer
to the PnvCore xscom register and drive the timebase state machine
from there.

Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 8beddb1313..0b47b92baa 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -2121,6 +2121,21 @@ static void pnv_chip_class_init(ObjectClass *klass, void *data)
     dc->desc = "PowerNV Chip";
 }
 
+PnvCore *pnv_chip_find_core(PnvChip *chip, uint32_t core_id)
+{
+    int i;
+
+    for (i = 0; i < chip->nr_cores; i++) {
+        PnvCore *pc = chip->cores[i];
+        CPUCore *cc = CPU_CORE(pc);
+
+        if (cc->core_id == core_id) {
+            return pc;
+        }
+    }
+    return NULL;
+}
+
 PowerPCCPU *pnv_chip_find_cpu(PnvChip *chip, uint32_t pir)
 {
     int i, j;