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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 | |||
| 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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| 4042 | jermar | 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 | |
| 43 | #define LSR_DATA_READY 0x01 |
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| 44 | |||
| 1921 | jermar | 45 | /** Initialize ns16550. |
| 46 | * |
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| 3934 | jermar | 47 | * @param dev Addrress of the beginning of the device in I/O space. |
| 3655 | jermar | 48 | * @param devno Device number. |
| 49 | * @param inr Interrupt number. |
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| 50 | * @param cir Clear interrupt function. |
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| 51 | * @param cir_arg First argument to cir. |
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| 4042 | jermar | 52 | * @param devout Output character device. |
| 3934 | jermar | 53 | * |
| 54 | * @return True on success, false on failure. |
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| 1921 | jermar | 55 | */ |
| 3934 | jermar | 56 | bool |
| 4042 | jermar | 57 | ns16550_init(ns16550_t *dev, devno_t devno, inr_t inr, cir_t cir, void *cir_arg, |
| 58 | chardev_t *devout) |
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| 1844 | jermar | 59 | { |
| 3934 | jermar | 60 | ns16550_instance_t *instance; |
| 1880 | jermar | 61 | |
| 3934 | jermar | 62 | instance = malloc(sizeof(ns16550_instance_t), FRAME_ATOMIC); |
| 63 | if (!instance) |
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| 64 | return false; |
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| 65 | |||
| 66 | instance->devno = devno; |
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| 67 | instance->ns16550 = dev; |
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| 4042 | jermar | 68 | instance->devout = devout; |
| 1921 | jermar | 69 | |
| 3938 | jermar | 70 | irq_initialize(&instance->irq); |
| 71 | instance->irq.devno = devno; |
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| 72 | instance->irq.inr = inr; |
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| 73 | instance->irq.claim = ns16550_claim; |
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| 74 | instance->irq.handler = ns16550_irq_handler; |
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| 75 | instance->irq.instance = instance; |
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| 76 | instance->irq.cir = cir; |
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| 77 | instance->irq.cir_arg = cir_arg; |
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| 78 | irq_register(&instance->irq); |
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| 3934 | jermar | 79 | |
| 3938 | jermar | 80 | while ((pio_read_8(&dev->lsr) & LSR_DATA_READY)) |
| 3934 | jermar | 81 | (void) pio_read_8(&dev->rbr); |
| 1921 | jermar | 82 | |
| 3646 | jermar | 83 | /* Enable interrupts */ |
| 3934 | jermar | 84 | pio_write_8(&dev->ier, IER_ERBFI); |
| 85 | pio_write_8(&dev->mcr, MCR_OUT2); |
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| 1911 | jermar | 86 | |
| 3934 | jermar | 87 | return true; |
| 1844 | jermar | 88 | } |
| 89 | |||
| 3941 | jermar | 90 | irq_ownership_t ns16550_claim(irq_t *irq) |
| 1844 | jermar | 91 | { |
| 4042 | jermar | 92 | ns16550_instance_t *instance = irq->instance; |
| 93 | ns16550_t *dev = instance->ns16550; |
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| 1844 | jermar | 94 | |
| 3934 | jermar | 95 | if (pio_read_8(&dev->lsr) & LSR_DATA_READY) |
| 96 | return IRQ_ACCEPT; |
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| 97 | else |
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| 98 | return IRQ_DECLINE; |
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| 1844 | jermar | 99 | } |
| 100 | |||
| 3934 | jermar | 101 | void ns16550_irq_handler(irq_t *irq) |
| 1844 | jermar | 102 | { |
| 4042 | jermar | 103 | ns16550_instance_t *instance = irq->instance; |
| 104 | ns16550_t *dev = instance->ns16550; |
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| 3934 | jermar | 105 | |
| 106 | if (pio_read_8(&dev->lsr) & LSR_DATA_READY) { |
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| 1931 | jermar | 107 | uint8_t x; |
| 108 | |||
| 3934 | jermar | 109 | x = pio_read_8(&dev->rbr); |
| 4042 | jermar | 110 | if (instance->devout) |
| 111 | chardev_push_character(instance->devout, x); |
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| 1844 | jermar | 112 | } |
| 1919 | jermar | 113 | } |
| 114 | |||
| 1844 | jermar | 115 | /** @} |
| 116 | */ |