Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4377 | svoboda | 1 | /* |
| 2 | * Copyright (c) 2009 Jakub Jermar |
||
| 3 | * All rights reserved. |
||
| 4 | * |
||
| 5 | * Redistribution and use in source and binary forms, with or without |
||
| 6 | * modification, are permitted provided that the following conditions |
||
| 7 | * are met: |
||
| 8 | * |
||
| 9 | * - Redistributions of source code must retain the above copyright |
||
| 10 | * notice, this list of conditions and the following disclaimer. |
||
| 11 | * - Redistributions in binary form must reproduce the above copyright |
||
| 12 | * notice, this list of conditions and the following disclaimer in the |
||
| 13 | * documentation and/or other materials provided with the distribution. |
||
| 14 | * - The name of the author may not be used to endorse or promote products |
||
| 15 | * derived from this software without specific prior written permission. |
||
| 16 | * |
||
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 27 | */ |
||
| 28 | |||
| 29 | /** @addtogroup genarch |
||
| 30 | * @{ |
||
| 31 | */ |
||
| 32 | /** |
||
| 33 | * @file |
||
| 34 | * @brief NS 16550 serial controller driver. |
||
| 35 | */ |
||
| 36 | |||
| 37 | #include <genarch/drivers/ns16550/ns16550.h> |
||
| 38 | #include <ddi/irq.h> |
||
| 39 | #include <arch/asm.h> |
||
| 40 | #include <console/chardev.h> |
||
| 41 | #include <mm/slab.h> |
||
| 42 | #include <ddi/device.h> |
||
| 43 | |||
| 44 | #define LSR_DATA_READY 0x01 |
||
| 45 | |||
| 46 | static irq_ownership_t ns16550_claim(irq_t *irq) |
||
| 47 | { |
||
| 48 | ns16550_instance_t *instance = irq->instance; |
||
| 49 | ns16550_t *dev = instance->ns16550; |
||
| 50 | |||
| 51 | if (pio_read_8(&dev->lsr) & LSR_DATA_READY) |
||
| 52 | return IRQ_ACCEPT; |
||
| 53 | else |
||
| 54 | return IRQ_DECLINE; |
||
| 55 | } |
||
| 56 | |||
| 57 | static void ns16550_irq_handler(irq_t *irq) |
||
| 58 | { |
||
| 59 | ns16550_instance_t *instance = irq->instance; |
||
| 60 | ns16550_t *dev = instance->ns16550; |
||
| 61 | |||
| 62 | if (pio_read_8(&dev->lsr) & LSR_DATA_READY) { |
||
| 63 | uint8_t data = pio_read_8(&dev->rbr); |
||
| 64 | indev_push_character(instance->kbrdin, data); |
||
| 65 | } |
||
| 66 | } |
||
| 67 | |||
| 68 | /**< Clear input buffer. */ |
||
| 69 | static void ns16550_clear_buffer(ns16550_t *dev) |
||
| 70 | { |
||
| 71 | while ((pio_read_8(&dev->lsr) & LSR_DATA_READY)) |
||
| 72 | (void) pio_read_8(&dev->rbr); |
||
| 73 | } |
||
| 74 | |||
| 75 | /** Initialize ns16550. |
||
| 76 | * |
||
| 77 | * @param dev Addrress of the beginning of the device in I/O space. |
||
| 78 | * @param devno Device number. |
||
| 79 | * @param inr Interrupt number. |
||
| 80 | * @param cir Clear interrupt function. |
||
| 81 | * @param cir_arg First argument to cir. |
||
| 82 | * |
||
| 83 | * @return Keyboard instance or NULL on failure. |
||
| 84 | * |
||
| 85 | */ |
||
| 86 | ns16550_instance_t *ns16550_init(ns16550_t *dev, inr_t inr, cir_t cir, void *cir_arg) |
||
| 87 | { |
||
| 88 | ns16550_instance_t *instance |
||
| 89 | = malloc(sizeof(ns16550_instance_t), FRAME_ATOMIC); |
||
| 90 | if (instance) { |
||
| 91 | instance->ns16550 = dev; |
||
| 92 | instance->kbrdin = NULL; |
||
| 93 | |||
| 94 | irq_initialize(&instance->irq); |
||
| 95 | instance->irq.devno = device_assign_devno(); |
||
| 96 | instance->irq.inr = inr; |
||
| 97 | instance->irq.claim = ns16550_claim; |
||
| 98 | instance->irq.handler = ns16550_irq_handler; |
||
| 99 | instance->irq.instance = instance; |
||
| 100 | instance->irq.cir = cir; |
||
| 101 | instance->irq.cir_arg = cir_arg; |
||
| 102 | } |
||
| 103 | |||
| 104 | return instance; |
||
| 105 | } |
||
| 106 | |||
| 107 | void ns16550_wire(ns16550_instance_t *instance, indev_t *kbrdin) |
||
| 108 | { |
||
| 109 | ASSERT(instance); |
||
| 110 | ASSERT(kbrdin); |
||
| 111 | |||
| 112 | instance->kbrdin = kbrdin; |
||
| 113 | irq_register(&instance->irq); |
||
| 114 | |||
| 115 | ns16550_clear_buffer(instance->ns16550); |
||
| 116 | |||
| 117 | /* Enable interrupts */ |
||
| 118 | pio_write_8(&instance->ns16550->ier, IER_ERBFI); |
||
| 119 | pio_write_8(&instance->ns16550->mcr, MCR_OUT2); |
||
| 120 | } |
||
| 121 | |||
| 122 | /** @} |
||
| 123 | */ |