forked from Imagelibrary/rtems
120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
/*
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* This file contains the TTY driver for the serial ports on the LEON.
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*
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* This driver uses the termios pseudo driver.
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*
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* COPYRIGHT (c) 1989-1999.
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* On-Line Applications Research Corporation (OAR).
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*
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* Modified for LEON3 BSP.
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* COPYRIGHT (c) 2011.
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* Aeroflex Gaisler.
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#include <bsp.h>
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#include <leon.h>
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#include <rtems/libio.h>
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#include <rtems/sysinit.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <stdio.h>
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#include <bsp/apbuart.h>
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#include <bsp/apbuart_termios.h>
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int leon3_debug_uart_index __attribute__((weak)) = 0;
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struct apbuart_regs *leon3_debug_uart = NULL;
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/* Before UART driver has registered (or when no UART is available), calls to
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* printk that gets to bsp_out_char() will be filling data into the
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* pre_printk_dbgbuf[] buffer, hopefully the buffer can help debugging the
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* early BSP boot.. At least the last printk() will be caught.
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*/
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static char pre_printk_dbgbuf[32] = {0};
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static int pre_printk_pos = 0;
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/* Initialize the BSP system debug console layer. It will scan AMBA Plu&Play
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* for a debug APBUART and enable RX/TX for that UART.
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*/
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static void bsp_debug_uart_init(void)
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{
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int i;
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struct ambapp_dev *adev;
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struct ambapp_apb_info *apb;
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/* Update leon3_debug_uart_index to index used as debug console. Let user
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* select Debug console by setting leon3_debug_uart_index. If the BSP is to
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* provide the default UART (leon3_debug_uart_index==0):
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* non-MP: APBUART[0] is debug console
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* MP: LEON CPU index select UART
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*/
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if (leon3_debug_uart_index == 0) {
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#if defined(RTEMS_MULTIPROCESSING)
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leon3_debug_uart_index = LEON3_Cpu_Index;
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#else
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leon3_debug_uart_index = 0;
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#endif
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} else {
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leon3_debug_uart_index--; /* User selected dbg-console */
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}
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/* Find APBUART core for System Debug Console */
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i = leon3_debug_uart_index;
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adev = (void *)ambapp_for_each(&ambapp_plb, (OPTIONS_ALL|OPTIONS_APB_SLVS),
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VENDOR_GAISLER, GAISLER_APBUART,
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ambapp_find_by_idx, (void *)&i);
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if (adev) {
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/* Found a matching debug console, initialize debug uart if present
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* for printk
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*/
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apb = (struct ambapp_apb_info *)adev->devinfo;
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leon3_debug_uart = (struct apbuart_regs *)apb->start;
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leon3_debug_uart->ctrl |= APBUART_CTRL_RE | APBUART_CTRL_TE;
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leon3_debug_uart->status = 0;
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}
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}
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RTEMS_SYSINIT_ITEM(
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bsp_debug_uart_init,
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RTEMS_SYSINIT_BSP_START,
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RTEMS_SYSINIT_ORDER_FOURTH
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);
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/* putchar/getchar for printk */
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static void bsp_out_char(char c)
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{
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if (leon3_debug_uart == NULL) {
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/* Local debug buffer when UART driver has not registered */
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pre_printk_dbgbuf[pre_printk_pos++] = c;
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pre_printk_pos = pre_printk_pos & (sizeof(pre_printk_dbgbuf)-1);
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return;
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}
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apbuart_outbyte_polled(leon3_debug_uart, c, 1, 1);
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}
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/*
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* To support printk
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*/
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#include <rtems/bspIo.h>
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BSP_output_char_function_type BSP_output_char = bsp_out_char;
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static int bsp_in_char(void)
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{
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int tmp;
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if (leon3_debug_uart == NULL)
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return EOF;
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while ((tmp = apbuart_inbyte_nonblocking(leon3_debug_uart)) < 0)
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;
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return tmp;
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}
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BSP_polling_getchar_function_type BSP_poll_char = bsp_in_char;
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