| Antonio Nino Diaz | 1d03668 | 2019-03-27 15:23:59 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2018-2019, Arm Limited. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <asm_macros.S> |
| 8 | #include <drivers/console.h> |
| 9 | |
| 10 | .globl console_init |
| 11 | .globl console_putc |
| 12 | .globl console_getc |
| 13 | .globl console_try_getc |
| 14 | .globl console_flush |
| 15 | |
| 16 | /* ----------------------------------------------- |
| 17 | * int console_init(uintptr_t base_addr, |
| 18 | * unsigned int uart_clk, unsigned int baud_rate) |
| 19 | * Function to initialize the console without a |
| 20 | * C Runtime to print debug information. It saves |
| 21 | * the console base to the data section. |
| 22 | * In: x0 - Console base address |
| 23 | * w1 - Uart clock in Hz |
| 24 | * w2 - Baud rate |
| 25 | * Out: w0 - Return 1 on success, 0 on error. |
| 26 | * Clobber list : x1 - x3 |
| 27 | * ----------------------------------------------- |
| 28 | */ |
| 29 | func console_init |
| 30 | mov w0, #1 |
| 31 | ret |
| 32 | endfunc console_init |
| 33 | |
| 34 | /* --------------------------------------------- |
| 35 | * int console_putc(int c) |
| 36 | * Function to output a character over the |
| 37 | * console. It returns the character printed on |
| 38 | * success or an error code. |
| 39 | * In : x0 - Character to be printed |
| 40 | * Out : w0 - Input character or error code. |
| 41 | * Clobber list : x1, x2 |
| 42 | * --------------------------------------------- |
| 43 | */ |
| 44 | func console_putc |
| 45 | /* Return the printed characted, which is in x0 */ |
| 46 | ret |
| 47 | endfunc console_putc |
| 48 | |
| 49 | /* --------------------------------------------- |
| 50 | * int console_getc(void) |
| 51 | * Function to get a character from the console. |
| 52 | * It returns the character grabbed on success |
| 53 | * or an error code on error. This function is |
| 54 | * blocking, it waits until there is an |
| 55 | * available character to return. |
| 56 | * Out : w0 - Return character or error code. |
| 57 | * Clobber list : x0 - x3 |
| 58 | * --------------------------------------------- |
| 59 | */ |
| 60 | func console_getc |
| 61 | mov w0, #ERROR_NO_VALID_CONSOLE |
| 62 | ret |
| 63 | endfunc console_getc |
| 64 | |
| 65 | /* --------------------------------------------- |
| 66 | * int console_try_getc(void) |
| 67 | * Function to get a character from the console. |
| 68 | * It returns the character grabbed on success |
| 69 | * or an error code on error. This function is |
| 70 | * non-blocking, it returns immediately. |
| 71 | * Out : w0 - Return character or error code. |
| 72 | * Clobber list : x0, x1 |
| 73 | * --------------------------------------------- |
| 74 | */ |
| 75 | func console_try_getc |
| 76 | mov w0, #ERROR_NO_PENDING_CHAR |
| 77 | ret |
| 78 | endfunc console_try_getc |
| 79 | |
| 80 | /* --------------------------------------------- |
| 81 | * int console_flush(void) |
| 82 | * Function to force a write of all buffered |
| 83 | * data that hasn't been output. It returns 0 |
| 84 | * upon successful completion, otherwise it |
| 85 | * returns an error code. |
| 86 | * Out: w0 - Error code or 0. |
| 87 | * Clobber list : x0, x1 |
| 88 | * --------------------------------------------- |
| 89 | */ |
| 90 | func console_flush |
| 91 | mov w0, #0 |
| 92 | ret |
| 93 | endfunc console_flush |