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/*
* This file contains the TTY driver for the serial ports on the LEON.
*
* This driver uses the termios pseudo driver.
*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* Modified for LEON3 BSP.
* COPYRIGHT (c) 2011.
* Aeroflex Gaisler.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#include <bsp.h>
#include <rtems/libio.h>
#include <stdlib.h>
#include <assert.h>
#include <stdio.h>
static int isinit = 0;
/* Let user override which on-chip APBUART will be debug UART
* 0 = Default APBUART. On MP system CPU0=APBUART0, CPU1=APBUART1...
* 1 = APBUART[0]
* 2 = APBUART[1]
* 3 = APBUART[2]
* ...
*/
int debug_uart_index __attribute__((weak)) = 0;
ambapp_apb_uart *dbg_uart = NULL;
/* Initialize the BSP system debug console layer. It will scan AMBA Plu&Play
* for a debug APBUART and enable RX/TX for that UART.
*/
int bsp_debug_uart_init(void)
{
int i;
struct ambapp_dev *adev;
struct ambapp_apb_info *apb;
if (isinit == 0) {
/* Update debug_uart_index to index used as debug console.
* Let user select Debug console by setting debug_uart_index. If the
* BSP is to provide the default UART (debug_uart_index==0):
* non-MP: APBUART[0] is debug console
* MP: LEON CPU index select UART
*/
if (debug_uart_index == 0) {
#if defined(RTEMS_MULTIPROCESSING)
debug_uart_index = LEON3_Cpu_Index;
#else
debug_uart_index = 0;
#endif
} else {
debug_uart_index = debug_uart_index - 1; /* User selected dbg-console */
}
/* Find APBUART core for System Debug Console */
i = debug_uart_index;
adev = (void *)ambapp_for_each(&ambapp_plb, (OPTIONS_ALL|OPTIONS_APB_SLVS),
VENDOR_GAISLER, GAISLER_APBUART,
ambapp_find_by_idx, (void *)&i);
if (adev) {
/* Found a matching debug console, initialize debug uart if present
* for printk
*/
apb = (struct ambapp_apb_info *)adev->devinfo;
dbg_uart = (ambapp_apb_uart *)apb->start;
dbg_uart->ctrl |= LEON_REG_UART_CTRL_RE | LEON_REG_UART_CTRL_TE;
dbg_uart->status = 0;
}
isinit = 1;
}
if (dbg_uart == NULL)
return 0;
else
return 1;
}
/*
* apbuart_outbyte_polled
*
* This routine transmits a character using polling.
*/
void apbuart_outbyte_polled(
ambapp_apb_uart *regs,
unsigned char ch
)
{
while ( (regs->status & LEON_REG_UART_STATUS_THE) == 0 );
regs->data = (unsigned int) ch;
}
/*
* apbuart_inbyte_nonblocking
*
* This routine polls for a character.
*/
int apbuart_inbyte_nonblocking(ambapp_apb_uart *regs)
{
/* Clear errors */
if (regs->status & LEON_REG_UART_STATUS_ERR)
regs->status = ~LEON_REG_UART_STATUS_ERR;
if ((regs->status & LEON_REG_UART_STATUS_DR) == 0)
return EOF;
else
return (int) regs->data;
}
/* putchar/getchar for printk */
static void bsp_out_char(char c)
{
if (dbg_uart == NULL)
return;
apbuart_outbyte_polled(dbg_uart, c);
}
/*
* To support printk
*/
#include <rtems/bspIo.h>
BSP_output_char_function_type BSP_output_char = bsp_out_char;
static int bsp_in_char(void)
{
int tmp;
if (dbg_uart == NULL)
return EOF;
while ((tmp = apbuart_inbyte_nonblocking(dbg_uart)) < 0)
;
return tmp;
}
BSP_polling_getchar_function_type BSP_poll_char = bsp_in_char;
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