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hw/char/cadence_uart: add clock support

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Switch the cadence uart to multi-phase reset and add the
reference clock input.

The input clock frequency is added to the migration structure.

The reference clock controls the baudrate generation. If it disabled,
any input characters and events are ignored.

If this clock remains unconnected, the uart behaves as before
(it default to a 50MHz ref clock).

Signed-off-by: Damien Hedde <damien.hedde@greensocs.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20200406135251.157596-8-damien.hedde@greensocs.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Damien Hedde 2020-04-06 15:52:49 +02:00 • committed by Peter Maydell
parent 38867cb7ec
commit b636db306e
3 changed files with 67 additions and 10 deletions
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1
include/hw/char/cadence_uart.h
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@ -49,6 +49,7 @@ typedef struct {
CharBackend chr;
qemu_irq irq;
QEMUTimer *fifo_trigger_handle;
Clock *refclk;
} CadenceUARTState;
static inline DeviceState *cadence_uart_create(hwaddr addr,