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4651 pillai 1
/*
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 * Copyright (c) 2009 Vineeth Pillai
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup genarch
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 * @{
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 */
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/**
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 * @file
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 * @brief   pl050 keyboard/mouse driver.
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 *
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 * It takes care of low-level keyboard functions.
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 */
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#include <genarch/drivers/pl050/pl050.h>
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#include <arch/asm.h>
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#include <console/chardev.h>
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#include <mm/slab.h>
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#include <ddi/device.h>
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#define PL050_KEY_RELEASE 0xF0
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#define PL050_ESC_KEY   0xE0
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#define PL050_CAPS_SCAN_CODE   0x58
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/** Structure for pl050's IRQ. */
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static pl050_t *pl050;
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static irq_ownership_t pl050_claim(irq_t *irq)
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{
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    uint8_t status;
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    if ((status = pio_read_8(pl050->status)) & PL050_STAT_RXFULL)
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        return IRQ_ACCEPT;
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    else {
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        return IRQ_DECLINE;
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    }
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}
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static void pl050_irq_handler(irq_t *irq)
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{
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    uint8_t data;
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    uint8_t status;
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    pl050_instance_t *instance = irq->instance;
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    while ((status = pio_read_8(pl050->status)) & PL050_STAT_RXFULL) {
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        data = pio_read_8(pl050->data);
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        indev_push_character(instance->kbrdin, data);
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    }
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}
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/** Initialize pl050. */
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pl050_instance_t *pl050_init(pl050_t *dev, inr_t inr)
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{
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    pl050_instance_t *instance =
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        malloc(sizeof(pl050_instance_t), FRAME_ATOMIC);
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    pl050 = dev;
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    if (instance) {
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        instance->pl050 = dev;
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        instance->kbrdin = NULL;
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        irq_initialize(&instance->irq);
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        instance->irq.devno = device_assign_devno();
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        instance->irq.inr = inr;
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        instance->irq.claim = pl050_claim;
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        instance->irq.handler = pl050_irq_handler;
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        instance->irq.instance = instance;
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    }
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    return instance;
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}
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void pl050_wire(pl050_instance_t *instance, indev_t *kbrdin)
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{
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    uint8_t val;
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    instance->kbrdin = kbrdin;
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    irq_register(&instance->irq);
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    val = PL050_CR_RXINTR | PL050_CR_INTR;
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    pio_write_8(pl050->ctrl, val);
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    /* reset the data buffer */
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    pio_read_8(pl050->data);
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}
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/** @}
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 */