ppc/pnv: Introduce PnvChipClass::xscom_pcba() method

The XSCOM bus is implemented with a QOM interface, which is mostly
generic from a CPU type standpoint, except for the computation of
addresses on the Pervasive Connect Bus (PCB) network. This is handled
by the pnv_xscom_pcba() function with a switch statement based on
the chip_type class level attribute of the CPU chip.

This can be achieved using QOM. Also the address argument is masked with
PNV_XSCOM_SIZE - 1, which is for POWER8 only. Addresses may have different
sizes with other CPU types. Have each CPU chip type handle the appropriate
computation with a QOM xscom_pcba() method.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <157623843543.360005.13996472463887521794.stgit@bahia.lan>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 1 insertions, 13 deletions

diff --git a/hw/ppc/pnv_xscom.c b/hw/ppc/pnv_xscom.c
index 5ae9dfbb88..b681c72575 100644
--- a/hw/ppc/pnv_xscom.c
+++ b/hw/ppc/pnv_xscom.c
@@ -57,19 +57,7 @@ static void xscom_complete(CPUState *cs, uint64_t hmer_bits)
 
 static uint32_t pnv_xscom_pcba(PnvChip *chip, uint64_t addr)
 {
-    addr &= (PNV_XSCOM_SIZE - 1);
-
-    switch (PNV_CHIP_GET_CLASS(chip)->chip_type) {
-    case PNV_CHIP_POWER8E:
-    case PNV_CHIP_POWER8:
-    case PNV_CHIP_POWER8NVL:
-        return ((addr >> 4) & ~0xfull) | ((addr >> 3) & 0xf);
-    case PNV_CHIP_POWER9:
-    case PNV_CHIP_POWER10:
-        return addr >> 3;
-    default:
-        g_assert_not_reached();
-    }
+    return PNV_CHIP_GET_CLASS(chip)->xscom_pcba(chip, addr);
 }
 
 static uint64_t xscom_read_default(PnvChip *chip, uint32_t pcba)