[PATCH v3] ppc/pnv: Fix number of I2C engines and ports for power9/10

[Glenn Miles <milesg@linux.vnet.ibm.com>]

Power9 is supposed to have 4 PIB-connected I2C engines with the
following number of ports on each engine:

    0: 2
    1: 13
    2: 2
    3: 2

Power10 also has 4 engines but has the following number of ports
on each engine:

    0: 14
    1: 14
    2: 2
    3: 16

Current code assumes that they all have the same (maximum) number.
This can be a problem if software expects to see a certain number
of ports present (Power Hypervisor seems to care).

Fixed this by adding separate tables for power9 and power10 that
map the I2C controller number to the number of I2C buses that should
be attached for that engine.

Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Glenn Miles <milesg@linux.vnet.ibm.com>
---
Based-on: <20231017221434.810363-1-milesg@linux.vnet.ibm.com>
([PATCH] ppc/pnv: Connect PNV I2C controller to powernv10)

Changes from v2:
    - Moved I2C port definitions close to the class definitions
    - Changed I2C port array type to const

 hw/ppc/pnv.c              | 12 ++++++++----
 include/hw/ppc/pnv_chip.h |  6 ++----
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 2655b6e506..1a728b92a0 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -1626,7 +1626,8 @@ static void pnv_chip_power9_realize(DeviceState *dev, Error **errp)
         Object *obj =  OBJECT(&chip9->i2c[i]);
 
         object_property_set_int(obj, "engine", i + 1, &error_fatal);
-        object_property_set_int(obj, "num-busses", pcc->i2c_num_ports,
+        object_property_set_int(obj, "num-busses",
+                                pcc->i2c_ports_per_engine[i],
                                 &error_fatal);
         object_property_set_link(obj, "chip", OBJECT(chip), &error_abort);
         if (!qdev_realize(DEVICE(obj), NULL, errp)) {
@@ -1651,6 +1652,7 @@ static void pnv_chip_power9_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     PnvChipClass *k = PNV_CHIP_CLASS(klass);
+    static const int i2c_ports_per_engine[PNV9_CHIP_MAX_I2C] = {2, 13, 2, 2};
 
     k->chip_cfam_id = 0x220d104900008000ull; /* P9 Nimbus DD2.0 */
     k->cores_mask = POWER9_CORE_MASK;
@@ -1667,7 +1669,7 @@ static void pnv_chip_power9_class_init(ObjectClass *klass, void *data)
     dc->desc = "PowerNV Chip POWER9";
     k->num_pecs = PNV9_CHIP_MAX_PEC;
     k->i2c_num_engines = PNV9_CHIP_MAX_I2C;
-    k->i2c_num_ports = PNV9_CHIP_MAX_I2C_PORTS;
+    k->i2c_ports_per_engine = i2c_ports_per_engine;
 
     device_class_set_parent_realize(dc, pnv_chip_power9_realize,
                                     &k->parent_realize);
@@ -1877,7 +1879,8 @@ static void pnv_chip_power10_realize(DeviceState *dev, Error **errp)
         Object *obj =  OBJECT(&chip10->i2c[i]);
 
         object_property_set_int(obj, "engine", i + 1, &error_fatal);
-        object_property_set_int(obj, "num-busses", pcc->i2c_num_ports,
+        object_property_set_int(obj, "num-busses",
+                                pcc->i2c_ports_per_engine[i],
                                 &error_fatal);
         object_property_set_link(obj, "chip", OBJECT(chip), &error_abort);
         if (!qdev_realize(DEVICE(obj), NULL, errp)) {
@@ -1902,6 +1905,7 @@ static void pnv_chip_power10_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     PnvChipClass *k = PNV_CHIP_CLASS(klass);
+    static const int i2c_ports_per_engine[PNV10_CHIP_MAX_I2C] = {14, 14, 2, 16};
 
     k->chip_cfam_id = 0x120da04900008000ull; /* P10 DD1.0 (with NX) */
     k->cores_mask = POWER10_CORE_MASK;
@@ -1918,7 +1922,7 @@ static void pnv_chip_power10_class_init(ObjectClass *klass, void *data)
     dc->desc = "PowerNV Chip POWER10";
     k->num_pecs = PNV10_CHIP_MAX_PEC;
     k->i2c_num_engines = PNV10_CHIP_MAX_I2C;
-    k->i2c_num_ports = PNV10_CHIP_MAX_I2C_PORTS;
+    k->i2c_ports_per_engine = i2c_ports_per_engine;
 
     device_class_set_parent_realize(dc, pnv_chip_power10_realize,
                                     &k->parent_realize);
diff --git a/include/hw/ppc/pnv_chip.h b/include/hw/ppc/pnv_chip.h
index 5815d96ecf..0ab5c42308 100644
--- a/include/hw/ppc/pnv_chip.h
+++ b/include/hw/ppc/pnv_chip.h
@@ -88,8 +88,7 @@ struct Pnv9Chip {
 #define PNV9_CHIP_MAX_PEC 3
     PnvPhb4PecState pecs[PNV9_CHIP_MAX_PEC];
 
-#define PNV9_CHIP_MAX_I2C 3
-#define PNV9_CHIP_MAX_I2C_PORTS 1
+#define PNV9_CHIP_MAX_I2C 4
     PnvI2C      i2c[PNV9_CHIP_MAX_I2C];
 };
 
@@ -122,7 +121,6 @@ struct Pnv10Chip {
     PnvPhb4PecState pecs[PNV10_CHIP_MAX_PEC];
 
 #define PNV10_CHIP_MAX_I2C 4
-#define PNV10_CHIP_MAX_I2C_PORTS 2
     PnvI2C       i2c[PNV10_CHIP_MAX_I2C];
 };
 
@@ -140,7 +138,7 @@ struct PnvChipClass {
     uint32_t     num_phbs;
 
     uint32_t     i2c_num_engines;
-    uint32_t     i2c_num_ports;
+    const int    *i2c_ports_per_engine;
 
     DeviceRealize parent_realize;
 
-- 
2.31.1