0,0 → 1,115 |
/* |
* 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: |
Added: svn:mergeinfo |