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>

2 files changed, 6 insertions, 0 deletions

diff --git a/include/hw/ppc/pnv.h b/include/hw/ppc/pnv.h
index 110ac9aace..476b136146 100644
--- a/include/hw/ppc/pnv.h
+++ b/include/hw/ppc/pnv.h
@@ -28,6 +28,7 @@
 
 #define TYPE_PNV_CHIP "pnv-chip"
 
+typedef struct PnvCore PnvCore;
 typedef struct PnvChip PnvChip;
 typedef struct Pnv8Chip Pnv8Chip;
 typedef struct Pnv9Chip Pnv9Chip;
@@ -56,6 +57,7 @@ DECLARE_INSTANCE_CHECKER(PnvChip, PNV_CHIP_POWER9,
 DECLARE_INSTANCE_CHECKER(PnvChip, PNV_CHIP_POWER10,
                          TYPE_PNV_CHIP_POWER10)
 
+PnvCore *pnv_chip_find_core(PnvChip *chip, uint32_t core_id);
 PowerPCCPU *pnv_chip_find_cpu(PnvChip *chip, uint32_t pir);
 
 typedef struct PnvPHB PnvPHB;
diff --git a/include/hw/ppc/pnv_chiptod.h b/include/hw/ppc/pnv_chiptod.h
index ca770525d9..fde569bcbf 100644
--- a/include/hw/ppc/pnv_chiptod.h
+++ b/include/hw/ppc/pnv_chiptod.h
@@ -25,6 +25,8 @@ enum tod_state {
     tod_stopped = 1,
 };
 
+typedef struct PnvCore PnvCore;
+
 struct PnvChipTOD {
     DeviceState xd;
 
@@ -36,12 +38,14 @@ struct PnvChipTOD {
     enum tod_state tod_state;
     uint64_t tod_error;
     uint64_t pss_mss_ctrl_reg;
+    PnvCore *slave_pc_target;
 };
 
 struct PnvChipTODClass {
     DeviceClass parent_class;
 
     void (*broadcast_ttype)(PnvChipTOD *sender, uint32_t trigger);
+    PnvCore *(*tx_ttype_target)(PnvChipTOD *chiptod, uint64_t val);
 
     int xscom_size;
 };