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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.org/license/LICENSE.
*/
#include <bsp.h>
#include <bsp/leon3.h>
#include <rtems/bspIo.h>
#include <rtems/sysinit.h>
#include <grlib/apbuart.h>
#include <grlib/io.h>
#if !defined(LEON3_APBUART_BASE)
#include <grlib/ambapp.h>
int leon3_debug_uart_index __attribute__((weak)) = 0;
apbuart *leon3_debug_uart = NULL;
#endif
static void bsp_debug_uart_init(void);
static void apbuart_enable_receive_and_transmit(apbuart *regs)
{
uint32_t ctrl;
ctrl = grlib_load_32(®s->ctrl);
ctrl |= APBUART_CTRL_RE | APBUART_CTRL_TE;
grlib_store_32(®s->ctrl, ctrl);
grlib_store_32(®s->status, 0);
}
static void bsp_debug_uart_output_char(char c)
{
apbuart_outbyte_polled(leon3_debug_uart, c);
apbuart_outbyte_wait(leon3_debug_uart);
}
static int bsp_debug_uart_poll_char(void)
{
return apbuart_inbyte_nonblocking(leon3_debug_uart);
}
static void bsp_debug_uart_pre_init_out(char c)
{
bsp_debug_uart_init();
(*BSP_output_char)(c);
}
#if defined(LEON3_APBUART_BASE)
static void bsp_debug_uart_init(void)
{
apbuart_enable_receive_and_transmit(leon3_debug_uart);
BSP_poll_char = bsp_debug_uart_poll_char;
BSP_output_char = bsp_debug_uart_output_char;
}
#else /* !LEON3_APBUART_BASE */
static void bsp_debug_uart_discard(char c)
{
(void) c;
}
/* 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;
if ( BSP_output_char != bsp_debug_uart_pre_init_out ) {
return;
}
BSP_output_char = bsp_debug_uart_discard;
/* Update leon3_debug_uart_index to index used as debug console. Let user
* select Debug console by setting leon3_debug_uart_index. If the BSP is to
* provide the default UART (leon3_debug_uart_index==0):
* non-MP: APBUART[0] is debug console
* MP: LEON CPU index select UART
*/
if (leon3_debug_uart_index == 0) {
#if defined(RTEMS_MULTIPROCESSING)
leon3_debug_uart_index = LEON3_Cpu_Index;
#else
leon3_debug_uart_index = 0;
#endif
} else {
leon3_debug_uart_index--; /* User selected dbg-console */
}
/* Find APBUART core for System Debug Console */
i = leon3_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 != NULL) {
struct ambapp_apb_info *apb;
/*
* Found a matching debug console, initialize debug UART if present for
* printk().
*/
apb = (struct ambapp_apb_info *)adev->devinfo;
leon3_debug_uart = (apbuart *)apb->start;
apbuart_enable_receive_and_transmit(leon3_debug_uart);
BSP_poll_char = bsp_debug_uart_poll_char;
BSP_output_char = bsp_debug_uart_output_char;
}
}
#endif /* LEON3_APBUART_BASE */
RTEMS_SYSINIT_ITEM(
bsp_debug_uart_init,
RTEMS_SYSINIT_BSP_START,
RTEMS_SYSINIT_ORDER_FOURTH
);
BSP_output_char_function_type BSP_output_char = bsp_debug_uart_pre_init_out;
BSP_polling_getchar_function_type BSP_poll_char;
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