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kvm,8250: Implement missing register emulation

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This patch implements missing register emulation as per "UART register to port
conversion table" here:

  http://www.lammertbies.nl/comm/info/serial-uart.html

Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Pekka Enberg
2015-06-01 16:39:41 +01:00
committed by Will Deacon
parent 855a637172
commit 19a2bb7d9f
1 changed files with 49 additions and 38 deletions
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8250-serial.c
+49 -38
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@@ -145,6 +145,28 @@ static bool serial8250_out(struct kvm *self, uint16_t port, void *data, int size
offset = port - dev->iobase;
/* LSR is factory test and MSR is not used for writes */
if (offset == UART_LSR || offset == UART_MSR)
return true;
/* FCR, LCR, MCR, and SCR have the same meaning regardless of DLAB */
switch (offset) {
case UART_FCR:
dev->fcr = ioport__read8(data);
return true;
case UART_LCR:
dev->lcr = ioport__read8(data);
return true;
case UART_MCR:
dev->mcr = ioport__read8(data);
return true;
case UART_SCR:
dev->scr = ioport__read8(data);
return true;
default:
break;
}
if (dev->lcr & UART_LCR_DLAB) {
switch (offset) {
case UART_DLL:
@@ -153,14 +175,6 @@ static bool serial8250_out(struct kvm *self, uint16_t port, void *data, int size
case UART_DLM:
dev->dlm = ioport__read8(data);
break;
case UART_FCR:
dev->fcr = ioport__read8(data);
break;
case UART_LCR:
dev->lcr = ioport__read8(data);
break;
default:
return false;
}
} else {
switch (offset) {
@@ -182,20 +196,6 @@ static bool serial8250_out(struct kvm *self, uint16_t port, void *data, int size
case UART_IER:
dev->ier = ioport__read8(data);
break;
case UART_FCR:
dev->fcr = ioport__read8(data);
break;
case UART_LCR:
dev->lcr = ioport__read8(data);
break;
case UART_MCR:
dev->mcr = ioport__read8(data);
break;
case UART_SCR:
dev->scr = ioport__read8(data);
break;
default:
return false;
}
}
@@ -213,21 +213,34 @@ static bool serial8250_in(struct kvm *self, uint16_t port, void *data, int size,
offset = port - dev->iobase;
if (dev->lcr & UART_LCR_DLAB)
return false;
switch (offset) {
case UART_RX:
if (dev->lsr & UART_LSR_DR) {
dev->iir = UART_IIR_NO_INT;
dev->lsr &= ~UART_LSR_DR;
ioport__write8(data, dev->rbr);
/* DLAB only changes the meaning of the first two registers */
if (dev->lcr & UART_LCR_DLAB) {
switch (offset) {
case UART_DLL:
ioport__write8(data, dev->dll);
return true;
case UART_DLM:
ioport__write8(data, dev->dlm);
return true;
}
break;
case UART_IER:
ioport__write8(data, dev->ier);
break;
} else {
switch (offset) {
case UART_RX:
if (dev->lsr & UART_LSR_DR) {
dev->iir = UART_IIR_NO_INT;
dev->lsr &= ~UART_LSR_DR;
ioport__write8(data, dev->rbr);
}
return true;
case UART_IER:
ioport__write8(data, dev->ier);
return true;
}
}
/* All other registers have the same meaning regardless of DLAB */
switch (offset) {
case UART_IIR:
dev->iir &= 0x3f; /* no FIFO for 8250 */
ioport__write8(data, dev->iir);
@@ -248,8 +261,6 @@ static bool serial8250_in(struct kvm *self, uint16_t port, void *data, int size,
/* No SCR for 8250 */
ioport__write8(data, 0);
break;
default:
return false;
}
return true;