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

hw/ppc/pnv.c

@@ -1120,6 +1120,12 @@ static void pnv_chip_power8_realize(DeviceState *dev, Error **errp)
                                 &chip8->homer.regs);
 }
 
+static uint32_t pnv_chip_power8_xscom_pcba(PnvChip *chip, uint64_t addr)
+{
+    addr &= (PNV_XSCOM_SIZE - 1);
+    return ((addr >> 4) & ~0xfull) | ((addr >> 3) & 0xf);
+}
+
 static void pnv_chip_power8e_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -1137,6 +1143,7 @@ static void pnv_chip_power8e_class_init(ObjectClass *klass, void *data)
     k->dt_populate = pnv_chip_power8_dt_populate;
     k->pic_print_info = pnv_chip_power8_pic_print_info;
     k->xscom_core_base = pnv_chip_power8_xscom_core_base;
+    k->xscom_pcba = pnv_chip_power8_xscom_pcba;
     dc->desc = "PowerNV Chip POWER8E";
 
     device_class_set_parent_realize(dc, pnv_chip_power8_realize,
@@ -1160,6 +1167,7 @@ static void pnv_chip_power8_class_init(ObjectClass *klass, void *data)
     k->dt_populate = pnv_chip_power8_dt_populate;
     k->pic_print_info = pnv_chip_power8_pic_print_info;
     k->xscom_core_base = pnv_chip_power8_xscom_core_base;
+    k->xscom_pcba = pnv_chip_power8_xscom_pcba;
     dc->desc = "PowerNV Chip POWER8";
 
     device_class_set_parent_realize(dc, pnv_chip_power8_realize,
@@ -1183,6 +1191,7 @@ static void pnv_chip_power8nvl_class_init(ObjectClass *klass, void *data)
     k->dt_populate = pnv_chip_power8_dt_populate;
     k->pic_print_info = pnv_chip_power8_pic_print_info;
     k->xscom_core_base = pnv_chip_power8_xscom_core_base;
+    k->xscom_pcba = pnv_chip_power8_xscom_pcba;
     dc->desc = "PowerNV Chip POWER8NVL";
 
     device_class_set_parent_realize(dc, pnv_chip_power8_realize,
@@ -1339,6 +1348,12 @@ static void pnv_chip_power9_realize(DeviceState *dev, Error **errp)
                                 &chip9->homer.regs);
 }
 
+static uint32_t pnv_chip_power9_xscom_pcba(PnvChip *chip, uint64_t addr)
+{
+    addr &= (PNV9_XSCOM_SIZE - 1);
+    return addr >> 3;
+}
+
 static void pnv_chip_power9_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -1356,6 +1371,7 @@ static void pnv_chip_power9_class_init(ObjectClass *klass, void *data)
     k->dt_populate = pnv_chip_power9_dt_populate;
     k->pic_print_info = pnv_chip_power9_pic_print_info;
     k->xscom_core_base = pnv_chip_power9_xscom_core_base;
+    k->xscom_pcba = pnv_chip_power9_xscom_pcba;
     dc->desc = "PowerNV Chip POWER9";
 
     device_class_set_parent_realize(dc, pnv_chip_power9_realize,
@@ -1421,6 +1437,12 @@ static void pnv_chip_power10_realize(DeviceState *dev, Error **errp)
                                             (uint64_t) PNV10_LPCM_BASE(chip));
 }
 
+static uint32_t pnv_chip_power10_xscom_pcba(PnvChip *chip, uint64_t addr)
+{
+    addr &= (PNV10_XSCOM_SIZE - 1);
+    return addr >> 3;
+}
+
 static void pnv_chip_power10_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -1438,6 +1460,7 @@ static void pnv_chip_power10_class_init(ObjectClass *klass, void *data)
     k->dt_populate = pnv_chip_power10_dt_populate;
     k->pic_print_info = pnv_chip_power10_pic_print_info;
     k->xscom_core_base = pnv_chip_power10_xscom_core_base;
+    k->xscom_pcba = pnv_chip_power10_xscom_pcba;
     dc->desc = "PowerNV Chip POWER10";
 
     device_class_set_parent_realize(dc, pnv_chip_power10_realize,

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)

include/hw/ppc/pnv.h

@@ -138,6 +138,7 @@ typedef struct PnvChipClass {
     void (*dt_populate)(PnvChip *chip, void *fdt);
     void (*pic_print_info)(PnvChip *chip, Monitor *mon);
     uint64_t (*xscom_core_base)(PnvChip *chip, uint32_t core_id);
+    uint32_t (*xscom_pcba)(PnvChip *chip, uint64_t addr);
 } PnvChipClass;
 
 #define PNV_CHIP_TYPE_SUFFIX "-" TYPE_PNV_CHIP