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| Rev | Author | Line No. | Line |
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| 1844 | jermar | 1 | /* |
| 3982 | jermar | 2 | * Copyright (c) 2009 Jakub Jermar |
| 1844 | jermar | 3 | * All rights reserved. |
| 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 | |||
| 4094 | decky | 29 | /** @addtogroup genarch |
| 1844 | jermar | 30 | * @{ |
| 31 | */ |
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| 32 | /** |
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| 33 | * @file |
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| 4094 | decky | 34 | * @brief NS 16550 serial controller driver. |
| 1844 | jermar | 35 | */ |
| 36 | |||
| 4042 | jermar | 37 | #include <genarch/drivers/ns16550/ns16550.h> |
| 1920 | jermar | 38 | #include <ddi/irq.h> |
| 1844 | jermar | 39 | #include <arch/asm.h> |
| 40 | #include <console/chardev.h> |
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| 3934 | jermar | 41 | #include <mm/slab.h> |
| 1844 | jermar | 42 | |
| 4094 | decky | 43 | #define LSR_DATA_READY 0x01 |
| 1844 | jermar | 44 | |
| 4119 | decky | 45 | static indev_operations_t kbrdin_ops = { |
| 4094 | decky | 46 | .poll = NULL |
| 47 | }; |
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| 48 | |||
| 49 | static irq_ownership_t ns16550_claim(irq_t *irq) |
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| 50 | { |
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| 51 | ns16550_instance_t *instance = irq->instance; |
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| 52 | ns16550_t *dev = instance->ns16550; |
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| 53 | |||
| 54 | if (pio_read_8(&dev->lsr) & LSR_DATA_READY) |
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| 55 | return IRQ_ACCEPT; |
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| 56 | else |
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| 57 | return IRQ_DECLINE; |
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| 58 | } |
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| 59 | |||
| 60 | static void ns16550_irq_handler(irq_t *irq) |
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| 61 | { |
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| 62 | ns16550_instance_t *instance = irq->instance; |
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| 63 | ns16550_t *dev = instance->ns16550; |
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| 64 | |||
| 65 | if (pio_read_8(&dev->lsr) & LSR_DATA_READY) { |
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| 66 | uint8_t x = pio_read_8(&dev->rbr); |
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| 4119 | decky | 67 | indev_push_character(&instance->kbrdin, x); |
| 4094 | decky | 68 | } |
| 69 | } |
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| 70 | |||
| 1921 | jermar | 71 | /** Initialize ns16550. |
| 72 | * |
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| 4094 | decky | 73 | * @param dev Addrress of the beginning of the device in I/O space. |
| 74 | * @param devno Device number. |
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| 75 | * @param inr Interrupt number. |
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| 76 | * @param cir Clear interrupt function. |
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| 77 | * @param cir_arg First argument to cir. |
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| 3934 | jermar | 78 | * |
| 4094 | decky | 79 | * @return Keyboard device pointer or NULL on failure. |
| 80 | * |
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| 1921 | jermar | 81 | */ |
| 4094 | decky | 82 | indev_t *ns16550_init(ns16550_t *dev, devno_t devno, inr_t inr, cir_t cir, void *cir_arg) |
| 1844 | jermar | 83 | { |
| 4094 | decky | 84 | ns16550_instance_t *instance |
| 85 | = malloc(sizeof(ns16550_instance_t), FRAME_ATOMIC); |
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| 86 | if (!instance) |
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| 87 | return NULL; |
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| 1880 | jermar | 88 | |
| 4094 | decky | 89 | indev_initialize("ns16550", &instance->kbrdin, &kbrdin_ops); |
| 90 | |||
| 3934 | jermar | 91 | instance->devno = devno; |
| 92 | instance->ns16550 = dev; |
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| 1921 | jermar | 93 | |
| 3938 | jermar | 94 | irq_initialize(&instance->irq); |
| 95 | instance->irq.devno = devno; |
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| 96 | instance->irq.inr = inr; |
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| 97 | instance->irq.claim = ns16550_claim; |
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| 98 | instance->irq.handler = ns16550_irq_handler; |
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| 99 | instance->irq.instance = instance; |
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| 100 | instance->irq.cir = cir; |
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| 101 | instance->irq.cir_arg = cir_arg; |
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| 102 | irq_register(&instance->irq); |
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| 4094 | decky | 103 | |
| 3938 | jermar | 104 | while ((pio_read_8(&dev->lsr) & LSR_DATA_READY)) |
| 3934 | jermar | 105 | (void) pio_read_8(&dev->rbr); |
| 1921 | jermar | 106 | |
| 3646 | jermar | 107 | /* Enable interrupts */ |
| 3934 | jermar | 108 | pio_write_8(&dev->ier, IER_ERBFI); |
| 109 | pio_write_8(&dev->mcr, MCR_OUT2); |
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| 1911 | jermar | 110 | |
| 4094 | decky | 111 | return &instance->kbrdin; |
| 1844 | jermar | 112 | } |
| 113 | |||
| 114 | /** @} |
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| 115 | */ |