Julius Werner | 03020da | 2018-11-27 22:10:56 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #if MULTI_CONSOLE_API |
| 8 | |
| 9 | #include <assert.h> |
| 10 | #include <drivers/console.h> |
| 11 | |
| 12 | console_t *console_list; |
| 13 | uint8_t console_state = CONSOLE_FLAG_BOOT; |
| 14 | |
| 15 | int console_register(console_t *console) |
| 16 | { |
| 17 | IMPORT_SYM(console_t *, __STACKS_START__, stacks_start) |
| 18 | IMPORT_SYM(console_t *, __STACKS_END__, stacks_end) |
| 19 | |
| 20 | /* Assert that the struct is not on the stack (common mistake). */ |
| 21 | assert((console < stacks_start) || (console >= stacks_end)); |
| 22 | /* Assert that we won't make a circle in the list. */ |
| 23 | assert(!console_is_registered(console)); |
| 24 | |
| 25 | console->next = console_list; |
| 26 | console_list = console; |
| 27 | |
| 28 | /* Return 1 for convenient tail-calling from console_xxx_register(). */ |
| 29 | return 1; |
| 30 | } |
| 31 | |
| 32 | console_t *console_unregister(console_t *to_be_deleted) |
| 33 | { |
| 34 | console_t **ptr; |
| 35 | |
| 36 | assert(to_be_deleted != NULL); |
| 37 | |
| 38 | for (ptr = &console_list; *ptr != NULL; ptr = &(*ptr)->next) |
| 39 | if (*ptr == to_be_deleted) { |
| 40 | *ptr = (*ptr)->next; |
| 41 | return to_be_deleted; |
| 42 | } |
| 43 | |
| 44 | return NULL; |
| 45 | } |
| 46 | |
| 47 | int console_is_registered(console_t *to_find) |
| 48 | { |
| 49 | console_t *console; |
| 50 | |
| 51 | assert(to_find != NULL); |
| 52 | |
| 53 | for (console = console_list; console != NULL; console = console->next) |
| 54 | if (console == to_find) |
| 55 | return 1; |
| 56 | |
| 57 | return 0; |
| 58 | } |
| 59 | |
| 60 | void console_switch_state(unsigned int new_state) |
| 61 | { |
| 62 | console_state = new_state; |
| 63 | } |
| 64 | |
| 65 | void console_set_scope(console_t *console, unsigned int scope) |
| 66 | { |
| 67 | assert(console != NULL); |
| 68 | |
| 69 | console->flags = (console->flags & ~CONSOLE_FLAG_SCOPE_MASK) | scope; |
| 70 | } |
| 71 | |
| 72 | int console_putc(int c) |
| 73 | { |
| 74 | int err = ERROR_NO_VALID_CONSOLE; |
| 75 | console_t *console; |
| 76 | |
| 77 | for (console = console_list; console != NULL; console = console->next) |
| 78 | if (console->flags & console_state) { |
| 79 | int ret = console->putc(c, console); |
| 80 | if ((err == ERROR_NO_VALID_CONSOLE) || (ret < err)) |
| 81 | err = ret; |
| 82 | } |
| 83 | |
| 84 | return err; |
| 85 | } |
| 86 | |
| 87 | int console_getc(void) |
| 88 | { |
| 89 | int err = ERROR_NO_VALID_CONSOLE; |
| 90 | console_t *console; |
| 91 | |
| 92 | do { /* Keep polling while at least one console works correctly. */ |
| 93 | for (console = console_list; console != NULL; |
| 94 | console = console->next) |
| 95 | if (console->flags & console_state) { |
| 96 | int ret = console->getc(console); |
| 97 | if (ret >= 0) |
| 98 | return ret; |
| 99 | if (err != ERROR_NO_PENDING_CHAR) |
| 100 | err = ret; |
| 101 | } |
| 102 | } while (err == ERROR_NO_PENDING_CHAR); |
| 103 | |
| 104 | return err; |
| 105 | } |
| 106 | |
| 107 | int console_flush(void) |
| 108 | { |
| 109 | int err = ERROR_NO_VALID_CONSOLE; |
| 110 | console_t *console; |
| 111 | |
| 112 | for (console = console_list; console != NULL; console = console->next) |
| 113 | if (console->flags & console_state) { |
| 114 | int ret = console->flush(console); |
| 115 | if ((err == ERROR_NO_VALID_CONSOLE) || (ret < err)) |
| 116 | err = ret; |
| 117 | } |
| 118 | |
| 119 | return err; |
| 120 | } |
| 121 | |
| 122 | #endif /* MULTI_CONSOLE_API */ |