[PATCH v5 16/18] hw/arm/aspeed_ast27x0: Set EHCI ctrldssegment-default

[Jamin Lin <jamin_lin@aspeedtech.com>]

On AST2700 platforms, system DRAM is mapped above 4GB with a base
address at 0x400000000.

The Linux EHCI driver programs the segment register to zero when
64-bit addressing is supported. As a result, descriptor addresses
derived from the EHCI registers do not include the DRAM base
address.

Descriptor memory is allocated through the DMA API with a 64-bit
DMA mask, allowing descriptors to reside in DRAM above 4GB. On
AST2700, EHCI queue heads (QH) and queue element transfer
descriptors (qTD) are therefore placed at addresses starting from
0x400000000.

Set the ctrldssegment-default property to 0x4 so the upper
32 bits of descriptor addresses are adjusted accordingly. This
allows the emulated EHCI controller to construct correct system
addresses when accessing descriptors in DRAM above 4GB.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
---
 hw/arm/aspeed_ast27x0.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/hw/arm/aspeed_ast27x0.c b/hw/arm/aspeed_ast27x0.c
index 87dcb82e1b..0cb39dc191 100644
--- a/hw/arm/aspeed_ast27x0.c
+++ b/hw/arm/aspeed_ast27x0.c
@@ -856,6 +856,8 @@ static void aspeed_soc_ast2700_realize(DeviceState *dev, Error **errp)
 
     /* EHCI */
     for (i = 0; i < sc->ehcis_num; i++) {
+        object_property_set_int(OBJECT(&s->ehci[i]), "ctrldssegment-default",
+                                0x4, &error_abort);
         if (!sysbus_realize(SYS_BUS_DEVICE(&s->ehci[i]), errp)) {
             return;
         }
-- 
2.43.0