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hw/{misc, riscv}: pfsoc: add system controller as unimplemented

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The system controller on PolarFire SoC is access via a mailbox. The
control registers for this mailbox lie in the "IOSCB" region & the
interrupt is cleared via write to the "SYSREG" region. It also has a
QSPI controller, usually connected to a flash chip, that is used for
storing FPGA bitstreams and used for In-Application Programming (IAP).

Linux has an implementation of the system controller, through which the
hwrng is accessed, leading to load/store access faults.

Add the QSPI as unimplemented and a very basic (effectively
unimplemented) version of the system controller's mailbox. Rather than
purely marking the regions as unimplemented, service the mailbox
requests by reporting failures and raising the interrupt so a guest can
better handle the lack of support.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20221117225518.4102575-4-conor@kernel.org>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Conor Dooley 2022-11-17 22:55:18 +00:00 • committed by Alistair Francis
parent 8d32e374a8
commit 592f0a9429
6 changed files with 95 additions and 6 deletions
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6
hw/riscv/microchip_pfsoc.c
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@ -306,6 +306,9 @@ static void microchip_pfsoc_soc_realize(DeviceState *dev, Error **errp)
sysbus_realize(SYS_BUS_DEVICE(&s->sysreg), errp);
sysbus_mmio_map(SYS_BUS_DEVICE(&s->sysreg), 0,
memmap[MICROCHIP_PFSOC_SYSREG].base);
sysbus_connect_irq(SYS_BUS_DEVICE(&s->sysreg), 0,
qdev_get_gpio_in(DEVICE(s->plic),
MICROCHIP_PFSOC_MAILBOX_IRQ));
/* AXISW */
create_unimplemented_device("microchip.pfsoc.axisw",
@ -459,6 +462,9 @@ static void microchip_pfsoc_soc_realize(DeviceState *dev, Error **errp)
sysbus_realize(SYS_BUS_DEVICE(&s->ioscb), errp);
sysbus_mmio_map(SYS_BUS_DEVICE(&s->ioscb), 0,
memmap[MICROCHIP_PFSOC_IOSCB].base);
sysbus_connect_irq(SYS_BUS_DEVICE(&s->ioscb), 0,
qdev_get_gpio_in(DEVICE(s->plic),
MICROCHIP_PFSOC_MAILBOX_IRQ));
/* FPGA Fabric */
create_unimplemented_device("microchip.pfsoc.fabricfic3",