add early uart driver so we can print debug message in SPL stage Signed-off-by: Lin Huang <hl@rock-chips.com> Acked-by: Simon Glass <sjg@chromium.org>master
parent
2863724831
commit
07d8d35a61
@ -0,0 +1,44 @@ |
||||
/*
|
||||
* (C) Copyright 2015 Rockchip Electronics Co., Ltd |
||||
* |
||||
* SPDX-License-Identifier: GPL-2.0+ |
||||
*/ |
||||
|
||||
#ifndef __ASM_ARCH_UART_H |
||||
#define __ASM_ARCH_UART_H |
||||
struct rk_uart { |
||||
unsigned int rbr; /* Receive buffer register. */ |
||||
unsigned int ier; /* Interrupt enable register. */ |
||||
unsigned int fcr; /* FIFO control register. */ |
||||
unsigned int lcr; /* Line control register. */ |
||||
unsigned int mcr; /* Modem control register. */ |
||||
unsigned int lsr; /* Line status register. */ |
||||
unsigned int msr; /* Modem status register. */ |
||||
unsigned int scr; |
||||
unsigned int reserved1[(0x30 - 0x20) / 4]; |
||||
unsigned int srbr[(0x70 - 0x30) / 4]; |
||||
unsigned int far; |
||||
unsigned int tfr; |
||||
unsigned int rfw; |
||||
unsigned int usr; |
||||
unsigned int tfl; |
||||
unsigned int rfl; |
||||
unsigned int srr; |
||||
unsigned int srts; |
||||
unsigned int sbcr; |
||||
unsigned int sdmam; |
||||
unsigned int sfe; |
||||
unsigned int srt; |
||||
unsigned int stet; |
||||
unsigned int htx; |
||||
unsigned int dmasa; |
||||
unsigned int reserver2[(0xf4 - 0xac) / 4]; |
||||
unsigned int cpr; |
||||
unsigned int ucv; |
||||
unsigned int ctr; |
||||
}; |
||||
|
||||
void rk_uart_init(void *base); |
||||
void print_hex(unsigned int n); |
||||
void print(char *s); |
||||
#endif |
@ -0,0 +1,63 @@ |
||||
/*
|
||||
* (C) Copyright 2015 Rockchip Electronics Co., Ltd |
||||
* |
||||
* SPDX-License-Identifier: GPL-2.0+ |
||||
*/ |
||||
|
||||
#include <asm/io.h> |
||||
#include <asm/arch/uart.h> |
||||
#include <common.h> |
||||
|
||||
static struct rk_uart *uart_ptr; |
||||
|
||||
static void uart_wrtie_byte(char byte) |
||||
{ |
||||
writel(byte, &uart_ptr->rbr); |
||||
while (!(readl(&uart_ptr->lsr) & 0x40)) |
||||
; |
||||
} |
||||
|
||||
void print(char *s) |
||||
{ |
||||
while (*s) { |
||||
if (*s == '\n') |
||||
uart_wrtie_byte('\r'); |
||||
uart_wrtie_byte(*s); |
||||
s++; |
||||
} |
||||
} |
||||
|
||||
void print_hex(unsigned int n) |
||||
{ |
||||
int i; |
||||
int temp; |
||||
|
||||
uart_wrtie_byte('0'); |
||||
uart_wrtie_byte('x'); |
||||
|
||||
for (i = 8; i > 0; i--) { |
||||
temp = (n >> (i - 1) * 4) & 0x0f; |
||||
if (temp < 10) |
||||
uart_wrtie_byte((char)(temp + '0')); |
||||
else |
||||
uart_wrtie_byte((char)(temp - 10 + 'a')); |
||||
} |
||||
uart_wrtie_byte('\n'); |
||||
uart_wrtie_byte('\r'); |
||||
} |
||||
|
||||
/*
|
||||
* TODO: since rk3036 only 4K sram to use in SPL, for saving space, |
||||
* we implement uart driver this way, we should convert this to use |
||||
* ns16550 driver in future, which support DEBUG_UART in the standard way |
||||
*/ |
||||
void rk_uart_init(void *base) |
||||
{ |
||||
uart_ptr = (struct rk_uart *)base; |
||||
writel(0x83, &uart_ptr->lcr); |
||||
writel(0x0d, &uart_ptr->rbr); |
||||
writel(0x03, &uart_ptr->lcr); |
||||
|
||||
/* fifo enable, sfe is shadow register of FCR[0] */ |
||||
writel(0x01, &uart_ptr->sfe); |
||||
} |
Loading…
Reference in new issue