hw/alpha: Provide a PCI-ISA bridge device node

- Move initialization of the ISA bus from typhoon_init() to clipper_init();
  this apsect of device topology is really associated with the individual
  model, not the core logic chipset.  typhoon_init() now returns the IRQ
  to use for the output of the ISA PIC.

- In clipper_init(), instantiate an i82378 instance, and connect its
  PIC output to the ISA IRQ input provided by typhoon_init().  Remove
  the explicit instantiations of i8254 and i82374, as these devices
  are subsumed by the i82378.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Jason Thorpe <thorpej@me.com>
Message-Id: <20210616141538.25436-1-thorpej@me.com>
[rth: Remove direct dependencies on i82374, i8254, i8259.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 4 insertions, 15 deletions

diff --git a/hw/alpha/typhoon.c b/hw/alpha/typhoon.c
index fa31a2f286..bd39c8ca86 100644
--- a/hw/alpha/typhoon.c
+++ b/hw/alpha/typhoon.c
@@ -814,9 +814,9 @@ static void typhoon_alarm_timer(void *opaque)
     cpu_interrupt(CPU(s->cchip.cpu[cpu]), CPU_INTERRUPT_TIMER);
 }
 
-PCIBus *typhoon_init(MemoryRegion *ram, ISABus **isa_bus, qemu_irq *p_rtc_irq,
-                     AlphaCPU *cpus[4], pci_map_irq_fn sys_map_irq,
-                     uint8_t devfn_min)
+PCIBus *typhoon_init(MemoryRegion *ram, qemu_irq *p_isa_irq,
+                     qemu_irq *p_rtc_irq, AlphaCPU *cpus[4],
+                     pci_map_irq_fn sys_map_irq, uint8_t devfn_min)
 {
     MemoryRegion *addr_space = get_system_memory();
     DeviceState *dev;
@@ -844,6 +844,7 @@ PCIBus *typhoon_init(MemoryRegion *ram, ISABus **isa_bus, qemu_irq *p_rtc_irq,
         }
     }
 
+    *p_isa_irq = qemu_allocate_irq(typhoon_set_isa_irq, s, 0);
     *p_rtc_irq = qemu_allocate_irq(typhoon_set_timer_irq, s, 0);
 
     /* Main memory region, 0x00.0000.0000.  Real hardware supports 32GB,
@@ -919,18 +920,6 @@ PCIBus *typhoon_init(MemoryRegion *ram, ISABus **isa_bus, qemu_irq *p_rtc_irq,
     /* Pchip1 PCI I/O, 0x802.FC00.0000, 32MB.  */
     /* Pchip1 PCI configuration, 0x802.FE00.0000, 16MB.  */
 
-    /* Init the ISA bus.  */
-    /* ??? Technically there should be a cy82c693ub pci-isa bridge.  */
-    {
-        qemu_irq *isa_irqs;
-
-        *isa_bus = isa_bus_new(NULL, get_system_memory(), &s->pchip.reg_io,
-                               &error_abort);
-        isa_irqs = i8259_init(*isa_bus,
-                              qemu_allocate_irq(typhoon_set_isa_irq, s, 0));
-        isa_bus_irqs(*isa_bus, isa_irqs);
-    }
-
     return b;
 }