| 0,0 → 1,115 |
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| /* |
| * Copyright (c) 2009 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** @addtogroup genarch |
| * @{ |
| */ |
| /** |
| * @file |
| * @brief NS 16550 serial controller driver. |
| */ |
| |
| #include <genarch/drivers/ns16550/ns16550.h> |
| #include <ddi/irq.h> |
| #include <arch/asm.h> |
| #include <console/chardev.h> |
| #include <mm/slab.h> |
| |
| #define LSR_DATA_READY 0x01 |
| |
| static indev_operations_t kbrdin_ops = { |
| .poll = NULL |
| }; |
| |
| static irq_ownership_t ns16550_claim(irq_t *irq) |
| { |
| ns16550_instance_t *instance = irq->instance; |
| ns16550_t *dev = instance->ns16550; |
| |
| if (pio_read_8(&dev->lsr) & LSR_DATA_READY) |
| return IRQ_ACCEPT; |
| else |
| return IRQ_DECLINE; |
| } |
| |
| static void ns16550_irq_handler(irq_t *irq) |
| { |
| ns16550_instance_t *instance = irq->instance; |
| ns16550_t *dev = instance->ns16550; |
| |
| if (pio_read_8(&dev->lsr) & LSR_DATA_READY) { |
| uint8_t x = pio_read_8(&dev->rbr); |
| indev_push_character(&instance->kbrdin, x); |
| } |
| } |
| |
| /** Initialize ns16550. |
| * |
| * @param dev Addrress of the beginning of the device in I/O space. |
| * @param devno Device number. |
| * @param inr Interrupt number. |
| * @param cir Clear interrupt function. |
| * @param cir_arg First argument to cir. |
| * |
| * @return Keyboard device pointer or NULL on failure. |
| * |
| */ |
| indev_t *ns16550_init(ns16550_t *dev, devno_t devno, inr_t inr, cir_t cir, void *cir_arg) |
| { |
| ns16550_instance_t *instance |
| = malloc(sizeof(ns16550_instance_t), FRAME_ATOMIC); |
| if (!instance) |
| return NULL; |
| |
| indev_initialize("ns16550", &instance->kbrdin, &kbrdin_ops); |
| |
| instance->devno = devno; |
| instance->ns16550 = dev; |
| |
| irq_initialize(&instance->irq); |
| instance->irq.devno = devno; |
| instance->irq.inr = inr; |
| instance->irq.claim = ns16550_claim; |
| instance->irq.handler = ns16550_irq_handler; |
| instance->irq.instance = instance; |
| instance->irq.cir = cir; |
| instance->irq.cir_arg = cir_arg; |
| irq_register(&instance->irq); |
| |
| while ((pio_read_8(&dev->lsr) & LSR_DATA_READY)) |
| (void) pio_read_8(&dev->rbr); |
| |
| /* Enable interrupts */ |
| pio_write_8(&dev->ier, IER_ERBFI); |
| pio_write_8(&dev->mcr, MCR_OUT2); |
| |
| return &instance->kbrdin; |
| } |
| |
| /** @} |
| */ |
| Property changes: |
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| Added: svn:mergeinfo |
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