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hw/char: disable ibex uart receive if the buffer is full

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Not disabling the UART leads to QEMU overwriting the UART receive buffer with
the newest received byte. The rx_level variable is added to allow the use of
the existing OpenTitan driver libraries.

Signed-off-by: Alexander Wagner <alexander.wagner@ulal.de>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210309152130.13038-1-alexander.wagner@ulal.de
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Alexander Wagner 2021-03-09 16:21:30 +01:00 • committed by Alistair Francis
parent 5e437d3ccd
commit 82a4ed8e50
2 changed files with 22 additions and 5 deletions
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4
include/hw/char/ibex_uart.h
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@ -62,6 +62,8 @@ REG32(FIFO_CTRL, 0x1c)
FIELD(FIFO_CTRL, RXILVL, 2, 3)
FIELD(FIFO_CTRL, TXILVL, 5, 2)
REG32(FIFO_STATUS, 0x20)
FIELD(FIFO_STATUS, TXLVL, 0, 5)
FIELD(FIFO_STATUS, RXLVL, 16, 5)
REG32(OVRD, 0x24)
REG32(VAL, 0x28)
REG32(TIMEOUT_CTRL, 0x2c)
@ -82,6 +84,8 @@ struct IbexUartState {
uint8_t tx_fifo[IBEX_UART_TX_FIFO_SIZE];
uint32_t tx_level;
uint32_t rx_level;
QEMUTimer *fifo_trigger_handle;
uint64_t char_tx_time;