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/*

 * Copyright (c) 2001-2004 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   Zilog 8530 serial port driver.

 */

#include <genarch/kbd/z8530.h>

#include <genarch/kbd/key.h>

#include <genarch/kbd/scanc.h>

#include <genarch/kbd/scanc_sun.h>

#include <arch/drivers/kbd.h>

#include <console/console.h>

#include <console/chardev.h>

#include <sysinfo/sysinfo.h>

#include <ddi/irq.h>

#include <arch/asm.h>

#include <mm/slab.h>

static inline void z8530_write(ioport8_t *ctl, uint8_t reg, uint8_t val)

{

    /*

     * Registers 8-15 will automatically issue the Point High

     * command as their bit 3 is 1.

     */

    pio_write_8(ctl, reg);  /* select register */

    pio_write_8(ctl, val);  /* write value */

}

static inline uint8_t z8530_read(ioport8_t *ctl, uint8_t reg)

{

    /*

     * Registers 8-15 will automatically issue the Point High

     * command as their bit 3 is 1.

     */

    pio_write_8(ctl, reg);  /* select register */

    return pio_read_8(ctl);

}

/*

 * These codes read from z8530 data register are silently ignored.

 */

#define IGNORE_CODE 0x7f        /* all keys up */

static void z8530_suspend(chardev_t *);

static void z8530_resume(chardev_t *);

static chardev_operations_t ops = {

    .suspend = z8530_suspend,

    .resume = z8530_resume,

};

/** Initialize z8530. */

bool

z8530_init(z8530_t *dev, devno_t devno, inr_t inr, cir_t cir, void *cir_arg)

{

    z8530_instance_t *instance;

    chardev_initialize("z8530_kbd", &kbrd, &ops);

    stdin = &kbrd;

    instance = malloc(sizeof(z8530_instance_t), FRAME_ATOMIC);

    if (!instance)

        return false;

    instance->devno = devno;

    instance->z8530 = dev;

    irq_initialize(&instance->irq);

    instance->irq.devno = devno;

    instance->irq.inr = inr;

    instance->irq.claim = z8530_claim;

    instance->irq.handler = z8530_irq_handler;

    instance->irq.instance = instance;

    instance->irq.cir = cir;

    instance->irq.cir_arg = cir_arg;

    irq_register(&instance->irq);

    (void) z8530_read(&dev->ctl_a, RR8);

    /*

     * Clear any pending TX interrupts or we never manage

     * to set FHC UART interrupt state to idle.

     */

    z8530_write(&dev->ctl_a, WR0, WR0_TX_IP_RST);

    /* interrupt on all characters */

    z8530_write(&dev->ctl_a, WR1, WR1_IARCSC);

    /* 8 bits per character and enable receiver */

    z8530_write(&dev->ctl_a, WR3, WR3_RX8BITSCH | WR3_RX_ENABLE);

    /* Master Interrupt Enable. */

    z8530_write(&dev->ctl_a, WR9, WR9_MIE);

    /*

     * This is the necessary evil until the userspace drivers are entirely

     * self-sufficient.

     */

    sysinfo_set_item_val("kbd", NULL, true);

    sysinfo_set_item_val("kbd.type", NULL, KBD_Z8530);

    sysinfo_set_item_val("kbd.devno", NULL, devno);

    sysinfo_set_item_val("kbd.inr", NULL, inr);

    sysinfo_set_item_val("kbd.address.virtual", NULL, (uintptr_t) dev);

    return true;

}

/* Called from getc(). */

void z8530_resume(chardev_t *d)

{

}

/* Called from getc(). */

void z8530_suspend(chardev_t *d)

{

}

irq_ownership_t z8530_claim(irq_t *irq)

{

    z8530_instance_t *instance = irq->instance;

    z8530_t *dev = instance->z8530;

    return (z8530_read(&dev->ctl_a, RR0) & RR0_RCA);

}

void z8530_irq_handler(irq_t *irq)

{

    z8530_instance_t *instance = irq->instance;

    z8530_t *dev = instance->z8530;

    uint8_t x;

    if (z8530_read(&dev->ctl_a, RR0) & RR0_RCA) {

        x = z8530_read(&dev->ctl_a, RR8);

        if (x != IGNORE_CODE) {

            if (x & KEY_RELEASE)

                key_released(x ^ KEY_RELEASE);

            else

                key_pressed(x);

        }

    }

}

/** @}

 */