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riscv: sifive_uart: Generate TX interrupt

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At present the sifive uart model only generates RX interrupt. This
updates it to generate TX interrupt so that it is more useful.

Note the TX fifo is still unimplemented.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Bin Meng 2019-03-17 01:03:10 -07:00 committed by Palmer Dabbelt
parent 6b745d4fad
commit 4e85ea82c1
No known key found for this signature in database
GPG key ID: EF4CA1502CCBAB41
1 changed files with 3 additions and 1 deletions
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4
hw/riscv/sifive_uart.c
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@ -51,7 +51,8 @@ static uint64_t uart_ip(SiFiveUARTState *s)
static void update_irq(SiFiveUARTState *s)
{
int cond = 0;
if ((s->ie & SIFIVE_UART_IE_RXWM) && s->rx_fifo_len) {
if ((s->ie & SIFIVE_UART_IE_TXWM) ||
((s->ie & SIFIVE_UART_IE_RXWM) && s->rx_fifo_len)) {
cond = 1;
}
if (cond) {
@ -108,6 +109,7 @@ uart_write(void *opaque, hwaddr addr,
switch (addr) {
case SIFIVE_UART_TXFIFO:
qemu_chr_fe_write(&s->chr, &ch, 1);
update_irq(s);
return;
case SIFIVE_UART_IE:
s->ie = val64;