* Copyright (c) 2008 Travis Geiselbrecht
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <arch/generic/debug_uart_8250.h>
#include <debug.h>
#include <new>
DebugUART8250::DebugUART8250(addr_t base, int64 clock)
:
DebugUART(base, clock)
{
}
DebugUART8250::~DebugUART8250()
{
}
#define UART_RHR 0
#define UART_THR 0
#define UART_DLL 0
#define UART_IER 1
#define UART_DLH 1
#define UART_IIR 2
#define UART_FCR 2
#define UART_EFR 2
#define UART_LCR 3
#define UART_MCR 4
#define UART_LSR 5
#define UART_MSR 6
#define UART_TCR 6
#define UART_SPR 7
#define UART_TLR 7
#define LCR_8N1 0x03
#define FCR_FIFO_EN 0x01 /* Fifo enable */
#define FCR_RXSR 0x02 /* Receiver soft reset */
#define FCR_TXSR 0x04 /* Transmitter soft reset */
#define MCR_DTR 0x01
#define MCR_RTS 0x02
#define MCR_DMA_EN 0x04
#define MCR_TX_DFR 0x08
#define LCR_WLS_MSK 0x03 /* character length select mask */
#define LCR_WLS_5 0x00 /* 5 bit character length */
#define LCR_WLS_6 0x01 /* 6 bit character length */
#define LCR_WLS_7 0x02 /* 7 bit character length */
#define LCR_WLS_8 0x03 /* 8 bit character length */
#define LCR_STB 0x04 /* Number of stop Bits, off = 1, on = 1.5 or 2) */
#define LCR_PEN 0x08 /* Parity eneble */
#define LCR_EPS 0x10 /* Even Parity Select */
#define LCR_STKP 0x20 /* Stick Parity */
#define LCR_SBRK 0x40 /* Set Break */
#define LCR_BKSE 0x80 /* Bank select enable */
#define LSR_DR 0x01 /* Data ready */
#define LSR_OE 0x02 /* Overrun */
#define LSR_PE 0x04 /* Parity error */
#define LSR_FE 0x08 /* Framing error */
#define LSR_BI 0x10 /* Break */
#define LSR_THRE 0x20 /* Xmit holding register empty */
#define LSR_TEMT 0x40 /* Xmitter empty */
#define LSR_ERR 0x80 /* Error */
void
DebugUART8250::InitPort(uint32 baud)
{
Disable();
uint16 baudDivisor = Clock() / (16 * baud);
Out8(UART_LCR, LCR_8N1);
Out8(UART_IER, 0);
Out8(UART_FCR, 0);
Out8(UART_MCR, MCR_DTR | MCR_RTS);
unsigned char buffer = In8(UART_LCR);
Out8(UART_LCR, buffer | LCR_BKSE);
Out8(UART_DLL, baudDivisor & 0xff);
Out8(UART_DLH, (baudDivisor >> 8) & 0xff);
Out8(UART_LCR, buffer & ~LCR_BKSE);
Enable();
}
void
DebugUART8250::InitEarly()
{
}
void
DebugUART8250::Init()
{
}
int
DebugUART8250::PutChar(char c)
{
int32 timeout = 256 * 1024;
while (!(In8(UART_LSR) & (1<<6))) {
if (--timeout == 0)
return -1;
}
Out8(UART_THR, c);
return 0;
}
int
DebugUART8250::GetChar(bool wait)
{
if (wait) {
while (!(In8(UART_LSR) & (1<<0)));
} else {
if (!(In8(UART_LSR) & (1<<0)))
return -1;
}
return In8(UART_RHR);
}
void
DebugUART8250::FlushTx()
{
while (!(In8(UART_LSR) & (1<<6)));
}
void
DebugUART8250::FlushRx()
{
while (In8(UART_LSR) & (1<<0)) {
volatile char c = In8(UART_RHR);
(void)c;
}
}
DebugUART8250*
arch_get_uart_8250(addr_t base, int64 clock)
{
static char buffer[sizeof(DebugUART8250)];
DebugUART8250* uart = new(buffer) DebugUART8250(base, clock);
return uart;
}
