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| Rev | Author | Line No. | Line |
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| 1844 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | /** @addtogroup genarch |
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| 30 | * @{ |
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| 31 | */ |
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| 32 | /** |
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| 33 | * @file |
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| 34 | * @brief NS 16550 serial port / keyboard driver. |
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| 35 | */ |
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| 36 | |||
| 37 | #include <genarch/kbd/ns16550.h> |
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| 38 | #include <genarch/kbd/key.h> |
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| 39 | #include <genarch/kbd/scanc.h> |
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| 40 | #include <genarch/kbd/scanc_sun.h> |
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| 41 | #include <arch/drivers/ns16550.h> |
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| 42 | #include <arch/interrupt.h> |
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| 43 | #include <cpu.h> |
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| 44 | #include <arch/asm.h> |
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| 45 | #include <arch.h> |
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| 46 | #include <typedefs.h> |
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| 47 | #include <console/chardev.h> |
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| 48 | #include <console/console.h> |
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| 49 | #include <interrupt.h> |
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| 1880 | jermar | 50 | #include <sysinfo/sysinfo.h> |
| 1844 | jermar | 51 | |
| 52 | #define LSR_DATA_READY 0x01 |
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| 53 | |||
| 54 | /* |
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| 55 | * These codes read from ns16550 data register are silently ignored. |
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| 56 | */ |
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| 57 | #define IGNORE_CODE 0x7f /* all keys up */ |
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| 58 | |||
| 59 | static void ns16550_suspend(chardev_t *); |
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| 60 | static void ns16550_resume(chardev_t *); |
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| 61 | |||
| 62 | static chardev_operations_t ops = { |
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| 63 | .suspend = ns16550_suspend, |
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| 64 | .resume = ns16550_resume, |
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| 1896 | jermar | 65 | .read = ns16550_key_read |
| 1844 | jermar | 66 | }; |
| 67 | |||
| 68 | void ns16550_interrupt(int n, istate_t *istate); |
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| 69 | void ns16550_wait(void); |
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| 70 | |||
| 71 | /** Initialize keyboard and service interrupts using kernel routine */ |
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| 72 | void ns16550_grab(void) |
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| 73 | { |
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| 74 | /* TODO */ |
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| 75 | } |
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| 76 | |||
| 77 | /** Resume the former interrupt vector */ |
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| 78 | void ns16550_release(void) |
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| 79 | { |
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| 80 | /* TODO */ |
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| 81 | } |
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| 82 | |||
| 83 | /** Initialize ns16550. */ |
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| 84 | void ns16550_init(void) |
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| 85 | { |
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| 86 | ns16550_grab(); |
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| 87 | chardev_initialize("ns16550_kbd", &kbrd, &ops); |
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| 88 | stdin = &kbrd; |
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| 1880 | jermar | 89 | |
| 90 | sysinfo_set_item_val("kbd", NULL, true); |
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| 91 | sysinfo_set_item_val("kbd.irq", NULL, 0); |
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| 92 | sysinfo_set_item_val("kbd.address.virtual", NULL, (uintptr_t) kbd_virt_address); |
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| 1911 | jermar | 93 | |
| 94 | ns16550_ier_write(IER_ERBFI); /* enable receiver interrupt */ |
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| 95 | |||
| 96 | while (ns16550_lsr_read() & LSR_DATA_READY) |
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| 97 | (void) ns16550_rbr_read(); |
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| 1844 | jermar | 98 | } |
| 99 | |||
| 100 | /** Process ns16550 interrupt. |
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| 101 | * |
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| 102 | * @param n Interrupt vector. |
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| 103 | * @param istate Interrupted state. |
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| 104 | */ |
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| 105 | void ns16550_interrupt(int n, istate_t *istate) |
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| 106 | { |
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| 107 | /* TODO */ |
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| 108 | } |
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| 109 | |||
| 110 | /** Wait until the controller reads its data. */ |
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| 1888 | jermar | 111 | void ns16550_wait(void) |
| 112 | { |
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| 1844 | jermar | 113 | } |
| 114 | |||
| 115 | /* Called from getc(). */ |
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| 116 | void ns16550_resume(chardev_t *d) |
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| 117 | { |
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| 118 | } |
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| 119 | |||
| 120 | /* Called from getc(). */ |
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| 121 | void ns16550_suspend(chardev_t *d) |
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| 122 | { |
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| 123 | } |
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| 124 | |||
| 1896 | jermar | 125 | char ns16550_key_read(chardev_t *d) |
| 1844 | jermar | 126 | { |
| 127 | char ch; |
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| 128 | |||
| 129 | while(!(ch = active_read_buff_read())) { |
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| 130 | uint8_t x; |
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| 131 | while (!(ns16550_lsr_read() & LSR_DATA_READY)) |
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| 132 | ; |
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| 133 | x = ns16550_rbr_read(); |
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| 134 | if (x != IGNORE_CODE) { |
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| 135 | if (x & KEY_RELEASE) |
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| 136 | key_released(x ^ KEY_RELEASE); |
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| 137 | else |
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| 138 | active_read_key_pressed(x); |
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| 139 | } |
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| 140 | } |
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| 141 | return ch; |
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| 142 | } |
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| 143 | |||
| 144 | /** Poll for key press and release events. |
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| 145 | * |
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| 146 | * This function can be used to implement keyboard polling. |
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| 147 | */ |
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| 148 | void ns16550_poll(void) |
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| 149 | { |
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| 150 | uint8_t x; |
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| 151 | |||
| 1911 | jermar | 152 | while (ns16550_lsr_read() & LSR_DATA_READY) { |
| 1844 | jermar | 153 | x = ns16550_rbr_read(); |
| 154 | if (x != IGNORE_CODE) { |
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| 155 | if (x & KEY_RELEASE) |
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| 156 | key_released(x ^ KEY_RELEASE); |
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| 157 | else |
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| 158 | key_pressed(x); |
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| 159 | } |
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| 160 | } |
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| 161 | } |
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| 162 | |||
| 163 | /** @} |
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| 164 | */ |