| 1 | // SPDX-License-Identifier: GPL-2.0 |
|---|---|
| 2 | /* |
| 3 | * 16550 compatible uart based serial debug support for zboot |
| 4 | */ |
| 5 | |
| 6 | #include <linux/types.h> |
| 7 | #include <linux/serial_reg.h> |
| 8 | |
| 9 | #include <asm/addrspace.h> |
| 10 | |
| 11 | #include "decompress.h" |
| 12 | |
| 13 | #if defined(CONFIG_MACH_LOONGSON64) || defined(CONFIG_MIPS_MALTA) |
| 14 | #define UART_BASE 0x1fd003f8 |
| 15 | #define PORT(offset) (CKSEG1ADDR(UART_BASE) + (offset)) |
| 16 | #endif |
| 17 | |
| 18 | #ifdef CONFIG_MACH_INGENIC |
| 19 | #define INGENIC_UART_BASE_ADDR (0x10030000 + 0x1000 * CONFIG_ZBOOT_INGENIC_UART) |
| 20 | #define PORT(offset) (CKSEG1ADDR(INGENIC_UART_BASE_ADDR) + (4 * offset)) |
| 21 | #endif |
| 22 | |
| 23 | #ifdef CONFIG_ECONET |
| 24 | #define EN75_UART_BASE 0x1fbf0003 |
| 25 | #define PORT(offset) (CKSEG1ADDR(EN75_UART_BASE) + (4 * (offset))) |
| 26 | #endif |
| 27 | |
| 28 | #ifndef IOTYPE |
| 29 | #define IOTYPE char |
| 30 | #endif |
| 31 | |
| 32 | #ifndef PORT |
| 33 | #error please define the serial port address for your own machine |
| 34 | #endif |
| 35 | |
| 36 | static inline unsigned int serial_in(int offset) |
| 37 | { |
| 38 | return *((volatile IOTYPE *)PORT(offset)) & 0xFF; |
| 39 | } |
| 40 | |
| 41 | static inline void serial_out(int offset, int value) |
| 42 | { |
| 43 | *((volatile IOTYPE *)PORT(offset)) = value & 0xFF; |
| 44 | } |
| 45 | |
| 46 | void putc(char c) |
| 47 | { |
| 48 | int timeout = 1000000; |
| 49 | |
| 50 | while (((serial_in(UART_LSR) & UART_LSR_THRE) == 0) && (timeout-- > 0)) |
| 51 | ; |
| 52 | |
| 53 | serial_out(UART_TX, c); |
| 54 | } |
| 55 |