target/linux/bcm63xx/image/lzma-loader/src/board.c

   1 /*
   2  * BCM63XX specific implementation parts
   3  *
   4  * Copyright (C) 2020 Álvaro Fernández Rojas <noltari@gmail.com>
   5  * Copyright (C) 2014 Jonas Gorski <jogo@openwrt.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published
   9  * by the Free Software Foundation.
  10  */
  11
  12 #include <stddef.h>
  13 #include "config.h"
  14
  15 #define READREG(r)      *(volatile unsigned int *)(r)
  16 #define WRITEREG(r,v)   *(volatile unsigned int *)(r) = v
  17
  18 #define UART_IR_REG     0x10
  19 #define UART_FIFO_REG   0x14
  20
  21 static void wait_xfered(void)
  22 {
  23         unsigned int val;
  24
  25         do {
  26                 val = READREG(UART_BASE + UART_IR_REG);
  27                 if (val & (1 << 5))
  28                         break;
  29         } while (1);
  30 }
  31
  32 void board_putc(int ch)
  33 {
  34         if (!UART_BASE)
  35                 return;
  36
  37         wait_xfered();
  38         WRITEREG(UART_BASE + UART_FIFO_REG, ch);
  39         wait_xfered();
  40 }