| // 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_MACH_INGENIC |
| #define INGENIC_UART_BASE_ADDR (0x10030000 + 0x1000 * CONFIG_ZBOOT_INGENIC_UART) |
| #define PORT(offset) (CKSEG1ADDR(INGENIC_UART_BASE_ADDR) + (4 * offset)) |
| #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); |
| } |