[Skiboot] [PATCH] hw/chiptod: allow qemu to use the chiptod

[Nicholas Piggin]

There is a QEMU model for ChipTOD (not yet upstream) that provides
enough to get through skiboot's sync sequence.

So run the chiptod init when running under QEMU, if it is being
provided in the device tree. If not, don't crash because the QEMU
patch has not been merged yet...

Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
---
 core/chip.c  | 3 +--
 hw/chiptod.c | 8 ++++++--
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/core/chip.c b/core/chip.c
index 6fc5d423..cee65822 100644
--- a/core/chip.c
+++ b/core/chip.c
@@ -187,8 +187,7 @@ void init_chips(void)
 	    dt_node_is_compatible(dt_root, "qemu,powernv9") ||
 	    dt_node_is_compatible(dt_root, "qemu,powernv10") ||
 	    dt_find_by_path(dt_root, "/qemu")) {
-		proc_chip_quirks |= QUIRK_QEMU | QUIRK_NO_CHIPTOD
-			| QUIRK_NO_DIRECT_CTL | QUIRK_NO_RNG;
+		proc_chip_quirks |= QUIRK_QEMU | QUIRK_NO_DIRECT_CTL | QUIRK_NO_RNG;
 		prlog(PR_NOTICE, "CHIP: Detected QEMU simulator\n");
 	}
 
diff --git a/hw/chiptod.c b/hw/chiptod.c
index 736bd03f..e3941e29 100644
--- a/hw/chiptod.c
+++ b/hw/chiptod.c
@@ -1681,7 +1681,6 @@ error_out:
 
 static int64_t opal_resync_timebase(void)
 {
-	/* Mambo and qemu doesn't simulate the chiptod */
 	if (chip_quirk(QUIRK_NO_CHIPTOD))
 		return OPAL_SUCCESS;
 
@@ -1829,13 +1828,16 @@ void chiptod_init(void)
 	bool sres;
 	int i;
 
-	/* Mambo and qemu doesn't simulate the chiptod */
 	if (chip_quirk(QUIRK_NO_CHIPTOD))
 		return;
 
 	op_display(OP_LOG, OP_MOD_CHIPTOD, 0);
 
 	if (!chiptod_probe()) {
+		/* Not all QEMU models provide chiptod */
+		if (chip_quirk(QUIRK_QEMU))
+			return;
+
 		prerror("Failed ChipTOD detection !\n");
 		op_display(OP_FATAL, OP_MOD_CHIPTOD, 0);
 		abort();
@@ -1903,6 +1905,8 @@ void chiptod_init(void)
 
 	chiptod_init_topology_info();
 	op_display(OP_LOG, OP_MOD_CHIPTOD, 4);
+
+	prlog(PR_NOTICE, "Synchronized all processors to common timebase.\n");
 }
 
 /* CAPP timebase sync */
-- 
2.40.1