|author||Peter Maydell <email@example.com>||2021-02-04 15:33:17 +0000|
|committer||Peter Maydell <firstname.lastname@example.org>||2021-02-15 13:15:14 +0000|
hw/arm/mps2-tz: Size the uart-irq-orgate based on the number of UARTs
We create an OR gate to wire together the overflow IRQs for all the UARTs on the board; this has to have twice the number of inputs as there are UARTs, since each UART feeds it a TX overflow and an RX overflow interrupt line. Replace the hardcoded '10' with a calculation based on the size of the uart array in the MPS2TZMachineState. (We rely on OR gate inputs that are never wired up or asserted being treated as always-zero.) Signed-off-by: Peter Maydell <email@example.com>
1 files changed, 8 insertions, 3 deletions
diff --git a/hw/arm/mps2-tz.c b/hw/arm/mps2-tz.c
index 014ba77578..f1a9c5f65a 100644
@@ -516,13 +516,18 @@ static void mps2tz_common_init(MachineState *machine)
memory_region_add_subregion(system_memory, 0x80000000, machine->ram);
- /* The overflow IRQs for all UARTs are ORed together.
+ * The overflow IRQs for all UARTs are ORed together.
* Tx, Rx and "combined" IRQs are sent to the NVIC separately.
- * Create the OR gate for this.
+ * Create the OR gate for this: it has one input for the TX overflow
+ * and one for the RX overflow for each UART we might have.
+ * (If the board has fewer than the maximum possible number of UARTs
+ * those inputs are never wired up and are treated as always-zero.)
- object_property_set_int(OBJECT(&mms->uart_irq_orgate), "num-lines", 10,
+ object_property_set_int(OBJECT(&mms->uart_irq_orgate), "num-lines",
+ 2 * ARRAY_SIZE(mms->uart),
qdev_realize(DEVICE(&mms->uart_irq_orgate), NULL, &error_fatal);