/*
* This software is Copyright (C) 1998 by T.sqware - all rights limited
* It is provided in to the public domain "as is", can be freely modified
* as far as this copyight notice is kept unchanged, but does not imply
* an endorsement by T.sqware of the product in which it is included.
*
* COPYRIGHT (c) 2000 Canon Research France SA.
* Emmanuel Raguet, mailto:raguet@crf.canon.fr
*
* The license and distribution terms for this file may be
* found in found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#include <bsp.h>
#include <irq.h>
#include <registers.h>
#include <uart.h>
#include <rtems/libio.h>
#include <assert.h>
/*
* Basic 16552 driver
*/
struct uart_data
{
int hwFlow;
int baud;
};
static struct uart_data uart_data[2];
/*
* Macros to read/wirte register of uart, if configuration is
* different just rewrite these macros
*/
static inline unsigned char
uread(int uart, unsigned int reg)
{
register unsigned char val;
val = Regs[reg];
return val;
}
static inline void
uwrite(int uart, int reg, unsigned int val)
{
Regs[reg] = val;
}
#ifdef UARTDEBUG
static void
uartError(int uart)
{
unsigned char uartStatus, dummy;
uartStatus = uread(uart, LSR);
dummy = uread(uart, RBR);
if (uartStatus & OE)
printk("********* Over run Error **********\n");
if (uartStatus & PE)
printk("********* Parity Error **********\n");
if (uartStatus & FE)
printk("********* Framing Error **********\n");
if (uartStatus & BI)
printk("********* Parity Error **********\n");
if (uartStatus & ERFIFO)
printk("********* Error receive Fifo **********\n");
}
#else
inline void uartError(int uart)
{
unsigned char uartStatus;
uartStatus = uread(uart, LSR);
uartStatus = uread(uart, RBR);
}
#endif
/*
* Uart initialization, it is hardcoded to 8 bit, no parity,
* one stop bit, FIFO, things to be changed
* are baud rate and nad hw flow control,
* and longest rx fifo setting
*/
void
BSP_uart_init(int uart, int baud, int hwFlow)
{
unsigned char tmp;
/* Sanity check */
assert(uart == BSP_UART_COM1 || uart == BSP_UART_COM2);
switch(baud)
{
case 50:
case 75:
case 110:
case 134:
case 300:
case 600:
case 1200:
case 2400:
case 9600:
case 19200:
case 38400:
case 57600:
case 115200:
break;
default:
assert(0);
return;
}
/* Enable UART block */
uwrite(uart, CNT, UART_ENABLE | PAD_ENABLE);
/* Set DLAB bit to 1 */
uwrite(uart, LCR, DLAB);
/* Set baud rate */
uwrite(uart, DLL, (BSPBaseBaud/baud) & 0xff);
uwrite(uart, DLM, ((BSPBaseBaud/baud) >> 8) & 0xff);
/* 8-bit, no parity , 1 stop */
uwrite(uart, LCR, CHR_8_BITS);
/* Enable FIFO */
uwrite(uart, FCR, FIFO_EN | XMIT_RESET | RCV_RESET | RECEIVE_FIFO_TRIGGER12);
/* Disable Interrupts */
uwrite(uart, IER, 0);
/* Read status to clear them */
tmp = uread(uart, LSR);
tmp = uread(uart, RBR);
/* Remember state */
uart_data[uart].hwFlow = hwFlow;
uart_data[uart].baud = baud;
return;
}
/*
* Set baud
*/
void
BSP_uart_set_baud(int uart, int baud)
{
unsigned char ier;
/* Sanity check */
assert(uart == BSP_UART_COM1 || uart == BSP_UART_COM2);
/*
* This function may be called whenever TERMIOS parameters
* are changed, so we have to make sure that baud change is
* indeed required
*/
if(baud == uart_data[uart].baud)
{
return;
}
ier = uread(uart, IER);
BSP_uart_init(uart, baud, uart_data[uart].hwFlow);
uwrite(uart, IER, ier);
return;
}
/*
* Enable/disable interrupts
*/
void
BSP_uart_intr_ctrl(int uart, int cmd)
{
assert(uart == BSP_UART_COM1 || uart == BSP_UART_COM2);
switch(cmd)
{
case BSP_UART_INTR_CTRL_DISABLE:
uwrite(uart, IER, INTERRUPT_DISABLE);
break;
case BSP_UART_INTR_CTRL_ENABLE:
uwrite(uart, IER,
(RECEIVE_ENABLE |
TRANSMIT_ENABLE |
RECEIVER_LINE_ST_ENABLE
)
);
break;
case BSP_UART_INTR_CTRL_TERMIOS:
uwrite(uart, IER,
(RECEIVE_ENABLE |
RECEIVER_LINE_ST_ENABLE
)
);
break;
case BSP_UART_INTR_CTRL_GDB:
uwrite(uart, IER, RECEIVE_ENABLE);
break;
default:
assert(0);
break;
}
return;
}
/*
* Status function, -1 if error
* detected, 0 if no received chars available,
* 1 if received char available, 2 if break
* is detected, it will eat break and error
* chars. It ignores overruns - we cannot do
* anything about - it execpt count statistics
* and we are not counting it.
*/
int
BSP_uart_polled_status(int uart)
{
unsigned char val;
assert(uart == BSP_UART_COM1 || uart == BSP_UART_COM2);
val = uread(uart, LSR);
if(val & BI)
{
/* BREAK found, eat character */
uread(uart, RBR);
return BSP_UART_STATUS_BREAK;
}
if((val & (DR | OE | FE)) == 1)
{
/* No error, character present */
return BSP_UART_STATUS_CHAR;
}
if((val & (DR | OE | FE)) == 0)
{
/* Nothing */
return BSP_UART_STATUS_NOCHAR;
}
/*
* Framing or parity error
* eat character
*/
uread(uart, RBR);
return BSP_UART_STATUS_ERROR;
}
/*
* Polled mode write function
*/
void
BSP_uart_polled_write(int uart, int val)
{
unsigned char val1;
/* Sanity check */
assert(uart == BSP_UART_COM1 || uart == BSP_UART_COM2);
for(;;)
{
if((val1=uread(uart, LSR)) & THRE)
{
break;
}
}
uwrite(uart, THR, val & 0xff);
return;
}
void
BSP_output_char_via_serial(int val)
{
BSP_uart_polled_write(BSPConsolePort, val);
if (val == '\n') BSP_uart_polled_write(BSPConsolePort,'\r');
}
/*
* Polled mode read function
*/
int
BSP_uart_polled_read(int uart)
{
unsigned char val;
assert(uart == BSP_UART_COM1 || uart == BSP_UART_COM2);
for(;;)
{
if(uread(uart, LSR) & DR)
{
break;
}
}
val = uread(uart, RBR);
return (int)(val & 0xff);
}
unsigned
BSP_poll_char_via_serial()
{
return BSP_uart_polled_read(BSPConsolePort);
}
/* ================ Termios support =================*/
static volatile int termios_stopped_com1 = 0;
static volatile int termios_tx_active_com1 = 0;
static void* termios_ttyp_com1 = NULL;
static char termios_tx_hold_com1 = 0;
static volatile char termios_tx_hold_valid_com1 = 0;
static volatile int termios_stopped_com2 = 0;
static volatile int termios_tx_active_com2 = 0;
static void* termios_ttyp_com2 = NULL;
static char termios_tx_hold_com2 = 0;
static volatile char termios_tx_hold_valid_com2 = 0;
/*
* Set channel parameters
*/
void
BSP_uart_termios_set(int uart, void *ttyp)
{
assert(uart == BSP_UART_COM1 || uart == BSP_UART_COM2);
if(uart == BSP_UART_COM1)
{
termios_stopped_com1 = 0;
termios_tx_active_com1 = 0;
termios_ttyp_com1 = ttyp;
termios_tx_hold_com1 = 0;
termios_tx_hold_valid_com1 = 0;
}
else
{
termios_stopped_com2 = 0;
termios_tx_active_com2 = 0;
termios_ttyp_com2 = ttyp;
termios_tx_hold_com2 = 0;
termios_tx_hold_valid_com2 = 0;
}
return;
}
int
BSP_uart_termios_write_com1(int minor, const char *buf, int len)
{
assert(buf != NULL);
if(len <= 0)
{
return 0;
}
/* If there TX buffer is busy - something is royally screwed up */
assert((uread(BSP_UART_COM1, LSR) & THRE) != 0);
if(termios_stopped_com1)
{
/* CTS low */
termios_tx_hold_com1 = *buf;
termios_tx_hold_valid_com1 = 1;
return 0;
}
/* Write character */
uwrite(BSP_UART_COM1, THR, *buf & 0xff);
/* Enable interrupts if necessary */
if(!termios_tx_active_com1)
{
termios_tx_active_com1 = 1;
uwrite(BSP_UART_COM1, IER,
(RECEIVE_ENABLE |
TRANSMIT_ENABLE |
RECEIVER_LINE_ST_ENABLE
)
);
}
return 0;
}
int
BSP_uart_termios_write_com2(int minor, const char *buf, int len)
{
assert(buf != NULL);
if(len <= 0)
{
return 0;
}
/* If there TX buffer is busy - something is royally screwed up */
assert((uread(BSP_UART_COM2, LSR) & THRE) != 0);
if(termios_stopped_com2)
{
/* CTS low */
termios_tx_hold_com2 = *buf;
termios_tx_hold_valid_com2 = 1;
return 0;
}
/* Write character */
uwrite(BSP_UART_COM2, THR, *buf & 0xff);
/* Enable interrupts if necessary */
if(!termios_tx_active_com2)
{
termios_tx_active_com2 = 1;
uwrite(BSP_UART_COM2, IER,
(RECEIVE_ENABLE |
TRANSMIT_ENABLE |
RECEIVER_LINE_ST_ENABLE
)
);
}
return 0;
}
void
BSP_uart_termios_isr_com1(void)
{
unsigned char buf[40];
int off, ret, vect;
off = 0;
for(;;)
{
vect = uread(BSP_UART_COM1, IIR) & 0xf;
switch(vect)
{
case NO_MORE_INTR :
/* No more interrupts */
if(off != 0)
{
/* Update rx buffer */
rtems_termios_enqueue_raw_characters(termios_ttyp_com1,
(char *)buf,
off);
}
return;
case TRANSMITTER_HODING_REGISTER_EMPTY :
/*
* TX holding empty: we have to disable these interrupts
* if there is nothing more to send.
*/
ret = rtems_termios_dequeue_characters(termios_ttyp_com1, 1);
/* If nothing else to send disable interrupts */
if(ret == 0)
{
uwrite(BSP_UART_COM1, IER,
(RECEIVE_ENABLE |
RECEIVER_LINE_ST_ENABLE
)
);
termios_tx_active_com1 = 0;
}
break;
case RECEIVER_DATA_AVAIL :
case CHARACTER_TIMEOUT_INDICATION:
/* RX data ready */
assert(off < sizeof(buf));
buf[off++] = uread(BSP_UART_COM1, RBR);
break;
case RECEIVER_ERROR:
/* RX error: eat character */
uartError(BSP_UART_COM1);
break;
default:
/* Should not happen */
assert(0);
return;
}
}
}
void
BSP_uart_termios_isr_com2()
{
unsigned char buf[40];
int off, ret, vect;
off = 0;
for(;;)
{
vect = uread(BSP_UART_COM2, IIR) & 0xf;
switch(vect)
{
case NO_MORE_INTR :
/* No more interrupts */
if(off != 0)
{
/* Update rx buffer */
rtems_termios_enqueue_raw_characters(termios_ttyp_com2,
(char *)buf,
off);
}
return;
case TRANSMITTER_HODING_REGISTER_EMPTY :
/*
* TX holding empty: we have to disable these interrupts
* if there is nothing more to send.
*/
ret = rtems_termios_dequeue_characters(termios_ttyp_com2, 1);
/* If nothing else to send disable interrupts */
if(ret == 0)
{
uwrite(BSP_UART_COM2, IER,
(RECEIVE_ENABLE |
RECEIVER_LINE_ST_ENABLE
)
);
termios_tx_active_com2 = 0;
}
break;
case RECEIVER_DATA_AVAIL :
case CHARACTER_TIMEOUT_INDICATION:
/* RX data ready */
assert(off < sizeof(buf));
buf[off++] = uread(BSP_UART_COM2, RBR);
break;
case RECEIVER_ERROR:
/* RX error: eat character */
uartError(BSP_UART_COM2);
break;
default:
/* Should not happen */
assert(0);
return;
}
}
}
