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

   1 /*
   2  * Arch specific code for ramips based boards
   3  *
   4  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
   5  * Copyright (C) 2018 Tobias Schramm <tobleminer@gmail.com>
   6  * Copyright (C) 2023 Antonio Vázquez <antoniovazquezblanco@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License version 2 as published
  10  * by the Free Software Foundation.
  11  */
  12
  13 #include <stdint.h>
  14 #include <stddef.h>
  15
  16 #define KSEG0                   0x80000000
  17 #define KSEG1                   0xa0000000
  18
  19 #define _ATYPE_                 __PTRDIFF_TYPE__
  20 #define _ATYPE32_               int
  21
  22 #define _ACAST32_               (_ATYPE_)(_ATYPE32_)
  23
  24 #define CPHYSADDR(a)            ((_ACAST32_(a)) & 0x1fffffff)
  25
  26 #define KSEG0ADDR(a)            (CPHYSADDR(a) | KSEG0)
  27 #define KSEG1ADDR(a)            (CPHYSADDR(a) | KSEG1)
  28
  29 #if defined(SOC_MT7620) || defined(SOC_RT3883)
  30 #define UART_BASE                       KSEG1ADDR(0x10000c00)
  31 #define UART_THR                        (UART_BASE + 0x04)
  32 #define UART_LSR                        (UART_BASE + 0x1c)
  33 #define UART_LSR_THRE_MASK      0x40
  34 #elif defined(SOC_MT7621)
  35 #define UART_BASE                       KSEG1ADDR(0x1e000c00)
  36 #define UART_THR                        (UART_BASE + 0x00)
  37 #define UART_LSR                        (UART_BASE + 0x14)
  38 #define UART_LSR_THRE_MASK      0x20
  39 #elif defined(SOC_RT305X)
  40 #define UART_BASE                       KSEG1ADDR(0x10000500)
  41 #define UART_THR                        (UART_BASE + 0x04)
  42 #define UART_LSR                        (UART_BASE + 0x1c)
  43 #define UART_LSR_THRE_MASK      0x20
  44 #else
  45 #error "Unsupported SOC..."
  46 #endif
  47
  48 // Helper functions
  49 #define READREG(r)              (*(volatile uint32_t *)(r))
  50 #define WRITEREG(r,v)   (*(volatile uint32_t *)(r)) = v
  51
  52
  53 void board_init(void)
  54 {
  55 }
  56
  57 void board_putc(int ch)
  58 {
  59         while ((READREG(UART_LSR) & UART_LSR_THRE_MASK) == 0);
  60         WRITEREG(UART_THR, ch);
  61         while ((READREG(UART_LSR) & UART_LSR_THRE_MASK) == 0);
  62 }