target/linux/bmips/image/lzma-loader/src/board.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * BCM63XX specific implementation parts
   4  *
   5  * Copyright (C) 2020 Álvaro Fernández Rojas <noltari@gmail.com>
   6  * Copyright (C) 2014 Jonas Gorski <jogo@openwrt.org>
   7  */
   8
   9 #include <stddef.h>
  10 #include "config.h"
  11
  12 #define READREG(r)      *(volatile unsigned int *)(r)
  13 #define WRITEREG(r,v)   *(volatile unsigned int *)(r) = v
  14
  15 #define UART_IR_REG     0x10
  16 #define UART_FIFO_REG   0x14
  17
  18 static void wait_xfered(void)
  19 {
  20         unsigned int val;
  21
  22         do {
  23                 val = READREG(UART_BASE + UART_IR_REG);
  24                 if (val & (1 << 5))
  25                         break;
  26         } while (1);
  27 }
  28
  29 void board_putc(int ch)
  30 {
  31         if (!UART_BASE)
  32                 return;
  33
  34         wait_xfered();
  35         WRITEREG(UART_BASE + UART_FIFO_REG, ch);
  36         wait_xfered();
  37 }