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/*
* This file contains the TTY driver for the GRLIb APBUART
*
* This driver uses the termios pseudo driver.
*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* Modified for GRLIB 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.org/license/LICENSE.
*/
#include <bsp.h>
#include <amba.h>
#include <rtems/libio.h>
#include <rtems/sysinit.h>
#include <stdlib.h>
#include <assert.h>
#include <stdio.h>
#include <grlib/apbuart.h>
#include <grlib/ambapp.h>
int grlib_debug_uart_index __attribute__((weak)) = 0;
struct apbuart_regs *grlib_debug_uart = NULL;
/* Before UART driver has registered (or when no UART is available), calls to
* printk that gets to bsp_out_char() will be filling data into the
* pre_printk_dbgbuf[] buffer, hopefully the buffer can help debugging the
* early BSP boot.. At least the last printk() will be caught.
*
static char pre_printk_dbgbuf[32] = {0};
static int pre_printk_pos = 0;
*/
/* Initialize the BSP system debug console layer. It will scan AMBA Plu&Play
* for a debug APBUART and enable RX/TX for that UART.
*/
static void bsp_debug_uart_init(void)
{
int i;
struct ambapp_dev *adev;
struct ambapp_apb_info *apb;
/* Update grlib_debug_uart_index to index used as debug console. Let user
* select Debug console by setting grlib_debug_uart_index. If the BSP is to
* provide the default UART (grlib_debug_uart_index==0):
* non-MP: APBUART[0] is debug console
* MP: LEON CPU index select UART
*/
if (grlib_debug_uart_index == 0) {
#if defined(RTEMS_MULTIPROCESSING)
grlib_debug_uart_index = GRLIB_Cpu_Index;
#else
grlib_debug_uart_index = 0;
#endif
} else {
grlib_debug_uart_index--; /* User selected dbg-console */
}
/* Find APBUART core for System Debug Console */
i = grlib_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;
grlib_debug_uart = (struct apbuart_regs *)apb->start;
grlib_debug_uart->ctrl |= APBUART_CTRL_RE | APBUART_CTRL_TE;
grlib_debug_uart->status = 0;
}
}
RTEMS_SYSINIT_ITEM(
bsp_debug_uart_init,
RTEMS_SYSINIT_BSP_START,
RTEMS_SYSINIT_ORDER_FOURTH
);
/* putchar/getchar for printk */
static void bsp_out_char(char c)
{
if (grlib_debug_uart == NULL) {
/* Try to assign standard UART address to debug driver to pass some tests */
grlib_debug_uart = (struct apbuart_regs *) 0x80000100;
grlib_debug_uart->ctrl |= APBUART_CTRL_RE | APBUART_CTRL_TE;
grlib_debug_uart->status = 0;
/* Local debug buffer when UART driver has not registered */
/*
pre_printk_dbgbuf[pre_printk_pos++] = c;
pre_printk_pos = pre_printk_pos & (sizeof(pre_printk_dbgbuf)-1);
return;
*/
}
apbuart_outbyte_polled(grlib_debug_uart, c);
apbuart_outbyte_wait(grlib_debug_uart);
}
/*
* 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 (grlib_debug_uart == NULL)
return EOF;
while ((tmp = apbuart_inbyte_nonblocking(grlib_debug_uart)) < 0)
;
return tmp;
}
BSP_polling_getchar_function_type BSP_poll_char = bsp_in_char;
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