bc00c78b43
The rt305x series SOC have two UART devices, and the one at bus address 0x500 is disabled by default. Some boards do not even have a pinout for the first one, so use the same one that the kernel uses at 0xc00 instead. This allows the lzma-loader printing to be visible alongside the kernel log in the same console. Tested-by: Lech Perczak <lech.perczak@gmail.com> # zte,mf283plus Signed-off-by: Michael Pratt <mcpratt@pm.me>
66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
/*
|
|
* Arch specific code for ramips based boards
|
|
*
|
|
* Copyright (C) 2013 John Crispin <blogic@openwrt.org>
|
|
* Copyright (C) 2018 Tobias Schramm <tobleminer@gmail.com>
|
|
* Copyright (C) 2023 Antonio Vázquez <antoniovazquezblanco@gmail.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published
|
|
* by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
#include <stddef.h>
|
|
|
|
#define KSEG0 0x80000000
|
|
#define KSEG1 0xa0000000
|
|
|
|
#define _ATYPE_ __PTRDIFF_TYPE__
|
|
#define _ATYPE32_ int
|
|
|
|
#define _ACAST32_ (_ATYPE_)(_ATYPE32_)
|
|
|
|
#define CPHYSADDR(a) ((_ACAST32_(a)) & 0x1fffffff)
|
|
|
|
#define KSEG0ADDR(a) (CPHYSADDR(a) | KSEG0)
|
|
#define KSEG1ADDR(a) (CPHYSADDR(a) | KSEG1)
|
|
|
|
#define UART_LSR_THRE 0x20
|
|
#define UART_LSR_TEMT 0x40
|
|
|
|
#if defined(SOC_MT7620) || defined(SOC_RT3883)
|
|
#define UART_BASE KSEG1ADDR(0x10000c00)
|
|
#define UART_THR (UART_BASE + 0x04)
|
|
#define UART_LSR (UART_BASE + 0x1c)
|
|
#define UART_LSR_MASK UART_LSR_TEMT
|
|
#elif defined(SOC_MT7621)
|
|
#define UART_BASE KSEG1ADDR(0x1e000c00)
|
|
#define UART_THR (UART_BASE + 0x00)
|
|
#define UART_LSR (UART_BASE + 0x14)
|
|
#define UART_LSR_MASK UART_LSR_THRE
|
|
#elif defined(SOC_RT305X)
|
|
#define UART_BASE KSEG1ADDR(0x10000c00)
|
|
#define UART_THR (UART_BASE + 0x04)
|
|
#define UART_LSR (UART_BASE + 0x1c)
|
|
#define UART_LSR_MASK UART_LSR_THRE
|
|
#else
|
|
#error "Unsupported SOC..."
|
|
#endif
|
|
|
|
// Helper functions
|
|
#define READREG(r) (*(volatile uint32_t *)(r))
|
|
#define WRITEREG(r,v) (*(volatile uint32_t *)(r)) = v
|
|
|
|
|
|
void board_init(void)
|
|
{
|
|
}
|
|
|
|
void board_putc(int ch)
|
|
{
|
|
while ((READREG(UART_LSR) & UART_LSR_MASK) == 0);
|
|
WRITEREG(UART_THR, ch);
|
|
while ((READREG(UART_LSR) & UART_LSR_MASK) == 0);
|
|
}
|