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grlib-apbuart: Add support of various flags 

- enable/disable Rx and Tx
 - Rx and Tx interrupt
 - Tx FIFO empty and Tx SHIFT empty

Signed-off-by: Fabien Chouteau <chouteau@adacore.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Ronald Hecht 2013-02-19 17:22:11 +01:00 committed by Blue Swirl
parent 8eda222831
commit 99e448006d
1 changed files with 29 additions and 7 deletions
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36
hw/grlib_apbuart.c
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@ -75,7 +75,6 @@ typedef struct UART {
CharDriverState *chr;
/* registers */
uint32_t receive;
uint32_t status;
uint32_t control;
@ -136,12 +135,14 @@ static void grlib_apbuart_receive(void *opaque, const uint8_t *buf, int size)
{
UART *uart = opaque;
uart_add_to_fifo(uart, buf, size);
if (uart->control & UART_RECEIVE_ENABLE) {
uart_add_to_fifo(uart, buf, size);
uart->status |= UART_DATA_READY;
uart->status |= UART_DATA_READY;
if (uart->control & UART_RECEIVE_INTERRUPT) {
qemu_irq_pulse(uart->irq);
if (uart->control & UART_RECEIVE_INTERRUPT) {
qemu_irq_pulse(uart->irq);
}
}
}
@ -193,8 +194,15 @@ static void grlib_apbuart_write(void *opaque, hwaddr addr,
switch (addr) {
case DATA_OFFSET:
case DATA_OFFSET + 3: /* When only one byte write */
c = value & 0xFF;
qemu_chr_fe_write(uart->chr, &c, 1);
/* Transmit when character device available and transmitter enabled */
if ((uart->chr) && (uart->control & UART_TRANSMIT_ENABLE)) {
c = value & 0xFF;
qemu_chr_fe_write(uart->chr, &c, 1);
/* Generate interrupt */
if (uart->control & UART_TRANSMIT_INTERRUPT) {
qemu_irq_pulse(uart->irq);
}
}
return;
case STATUS_OFFSET:
@ -242,6 +250,19 @@ static int grlib_apbuart_init(SysBusDevice *dev)
return 0;
}
static void grlib_apbuart_reset(DeviceState *d)
{
UART *uart = container_of(d, UART, busdev.qdev);
/* Transmitter FIFO and shift registers are always empty in QEMU */
uart->status = UART_TRANSMIT_FIFO_EMPTY | UART_TRANSMIT_SHIFT_EMPTY;
/* Everything is off */
uart->control = 0;
/* Flush receive FIFO */
uart->len = 0;
uart->current = 0;
}
static Property grlib_apbuart_properties[] = {
DEFINE_PROP_CHR("chrdev", UART, chr),
DEFINE_PROP_END_OF_LIST(),
@ -253,6 +274,7 @@ static void grlib_apbuart_class_init(ObjectClass *klass, void *data)
SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
k->init = grlib_apbuart_init;
dc->reset = grlib_apbuart_reset;
dc->props = grlib_apbuart_properties;
}