// SPDX-License-Identifier: GPL-2.0
|
/*
|
* 16550 compatible uart based serial debug support for zboot
|
*/
|
|
#include <linux/types.h>
|
#include <linux/serial_reg.h>
|
|
#include <asm/addrspace.h>
|
|
#if defined(CONFIG_MACH_LOONGSON64) || defined(CONFIG_MIPS_MALTA)
|
#define UART_BASE 0x1fd003f8
|
#define PORT(offset) (CKSEG1ADDR(UART_BASE) + (offset))
|
#endif
|
|
#ifdef CONFIG_AR7
|
#include <ar7.h>
|
#define PORT(offset) (CKSEG1ADDR(AR7_REGS_UART0) + (4 * offset))
|
#endif
|
|
#ifdef CONFIG_MACH_INGENIC
|
#define INGENIC_UART0_BASE_ADDR 0x10030000
|
#define PORT(offset) (CKSEG1ADDR(INGENIC_UART0_BASE_ADDR) + (4 * offset))
|
#endif
|
|
#ifdef CONFIG_CPU_XLR
|
#define UART0_BASE 0x1EF14000
|
#define PORT(offset) (CKSEG1ADDR(UART0_BASE) + (4 * offset))
|
#define IOTYPE unsigned int
|
#endif
|
|
#ifdef CONFIG_CPU_XLP
|
#define UART0_BASE 0x18030100
|
#define PORT(offset) (CKSEG1ADDR(UART0_BASE) + (4 * offset))
|
#define IOTYPE unsigned int
|
#endif
|
|
#ifndef IOTYPE
|
#define IOTYPE char
|
#endif
|
|
#ifndef PORT
|
#error please define the serial port address for your own machine
|
#endif
|
|
static inline unsigned int serial_in(int offset)
|
{
|
return *((volatile IOTYPE *)PORT(offset)) & 0xFF;
|
}
|
|
static inline void serial_out(int offset, int value)
|
{
|
*((volatile IOTYPE *)PORT(offset)) = value & 0xFF;
|
}
|
|
void putc(char c)
|
{
|
int timeout = 1000000;
|
|
while (((serial_in(UART_LSR) & UART_LSR_THRE) == 0) && (timeout-- > 0))
|
;
|
|
serial_out(UART_TX, c);
|
}
|
