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/*

 * Copyright (c) 2007 Michal Kebrt, Petr Stepan

 * 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 arm32qemu_icp

 * @{

 */

/** @file

 *  @brief QEMU icp drivers.

 */

#include <interrupt.h>

#include <ipc/irq.h>

#include <console/chardev.h>

#include <arch/drivers/qemu.h>

#include <console/console.h>

#include <sysinfo/sysinfo.h>

#include <print.h>

#include <ddi/device.h>

#include <mm/page.h>

#include <arch/machine.h>

#include <arch/debug/print.h>

/* Addresses of devices. */

#define QEMU_ICP_VIDEORAM            0x16000000

#define QEMU_ICP_KBD                 0x18000000

#define QEMU_ICP_HALT_OFFSET         0x10

#define QEMU_ICP_RTC                 0x13000000

#define QEMU_ICP_RTC_FREQ_OFFSET     0x100

#define QEMU_ICP_RTC_ACK_OFFSET      0x110

#define QEMU_ICP_IRQC                0x14000000

#define QEMU_ICP_IRQC_MASK_OFFSET    0x8

#define QEMU_ICP_IRQC_UNMASK_OFFSET  0xC

#define QEMU_ICP_MP                  0x11000000

#define QEMU_ICP_MP_MEMSIZE_OFFSET   0x0090

#define QEMU_ICP_FB                  0x94000

#define ICP_VGA              0xC0000000

#define ICP_CMCR             0x10000000

/* IRQs */

#define QEMU_ICP_KBD_IRQ        3

#define QEMU_ICP_TIMER_IRQ  5

static qemu_icp_hw_map_t qemu_icp_hw_map;

static chardev_t console;

static irq_t qemu_icp_console_irq;

static irq_t qemu_icp_timer_irq;

static bool hw_map_init_called = false;

static bool vga_init = false;

static void qemu_icp_kbd_enable(chardev_t *dev);

static void qemu_icp_kbd_disable(chardev_t *dev);

static void qemu_icp_write(chardev_t *dev, const char ch);

static char qemu_icp_do_read(chardev_t *dev);

void icp_vga_init(void);

static chardev_operations_t qemu_icp_ops = {

    .resume = qemu_icp_kbd_enable,

    .suspend = qemu_icp_kbd_disable,

    .write = qemu_icp_write,

    .read = qemu_icp_do_read,

};

/** Initializes the vga

 *

 */

void icp_vga_init(void)

{

    *(uint32_t*)((char *)(qemu_icp_hw_map.cmcr)+0x14) = 0xA05F0000;

    *(uint32_t*)((char *)(qemu_icp_hw_map.cmcr)+0x1C) = 0x12C11000;

    *(uint32_t*)qemu_icp_hw_map.vga = 0x3F1F3F9C;

    *(uint32_t*)((char *)(qemu_icp_hw_map.vga) + 0x4) = 0x080B61DF;

    *(uint32_t*)((char *)(qemu_icp_hw_map.vga) + 0x8) = 0x067F3800;

    *(uint32_t*)((char *)(qemu_icp_hw_map.vga) + 0x10) = QEMU_ICP_FB;

    *(uint32_t *)((char *)(qemu_icp_hw_map.vga) + 0x1C) = 0x182B;

    *(uint32_t*)((char *)(qemu_icp_hw_map.cmcr)+0xC) = 0x33805000;

}

/** Returns the mask of active interrupts. */

static inline uint32_t qemu_icp_irqc_get_sources(void)

{

    return *((uint32_t *) qemu_icp_hw_map.irqc);

}

/** Masks interrupt.

 *

 * @param irq interrupt number

 */

static inline void qemu_icp_irqc_mask(uint32_t irq)

{

    *((uint32_t *) qemu_icp_hw_map.irqc_mask) = irq;

}

/** Unmasks interrupt.

 *

 * @param irq interrupt number

 */

static inline void qemu_icp_irqc_unmask(uint32_t irq)

{

    *((uint32_t *) qemu_icp_hw_map.irqc_unmask) = irq;

}

/** Initializes #qemu_icp_hw_map. */

void qemu_icp_hw_map_init(void)

{

    qemu_icp_hw_map.videoram = hw_map(QEMU_ICP_VIDEORAM, PAGE_SIZE);

    qemu_icp_hw_map.kbd = hw_map(QEMU_ICP_KBD, PAGE_SIZE);

    qemu_icp_hw_map.rtc = hw_map(QEMU_ICP_RTC, PAGE_SIZE);

    qemu_icp_hw_map.irqc = hw_map(QEMU_ICP_IRQC, PAGE_SIZE);

    qemu_icp_hw_map.rtc_freq = qemu_icp_hw_map.rtc + QEMU_ICP_RTC_FREQ_OFFSET;

    qemu_icp_hw_map.rtc_ack = qemu_icp_hw_map.rtc + QEMU_ICP_RTC_ACK_OFFSET;

    qemu_icp_hw_map.irqc_mask = qemu_icp_hw_map.irqc + QEMU_ICP_IRQC_MASK_OFFSET;

    qemu_icp_hw_map.irqc_unmask = qemu_icp_hw_map.irqc +

        QEMU_ICP_IRQC_UNMASK_OFFSET;

    qemu_icp_hw_map.cmcr = hw_map(ICP_CMCR, PAGE_SIZE);

    qemu_icp_hw_map.vga = hw_map(ICP_VGA, PAGE_SIZE);

    //icp_vga_init();

    hw_map_init_called = true;

}

/** Putchar that works with qemu_icp.

 *

 * @param dev Not used.

 * @param ch Characted to be printed.

 */

static void qemu_icp_write(chardev_t *dev, const char ch)

{

    *((char *) qemu_icp_hw_map.videoram) = ch;

}

/** Enables qemu_icp keyboard (interrupt unmasked).

 *

 * @param dev Not used.

 *

 * Called from getc().

 */

static void qemu_icp_kbd_enable(chardev_t *dev)

{

    qemu_icp_irqc_unmask(QEMU_ICP_KBD_IRQ);

}

/** Disables qemu_icp keyboard (interrupt masked).

 *

 * @param dev not used

 *

 * Called from getc().

 */

static void qemu_icp_kbd_disable(chardev_t *dev)

{

    qemu_icp_irqc_mask(QEMU_ICP_KBD_IRQ);

}

/** Read character using polling, assume interrupts disabled.

 *

 *  @param dev Not used.

 */

static char qemu_icp_do_read(chardev_t *dev)

{

    char ch;

    while (1) {

        ch = *((volatile char *) qemu_icp_hw_map.kbd);

        if (ch) {

            if (ch == '\r')

                return '\n';

            if (ch == 0x7f)

                return '\b';

            return ch;

        }

    }

}

/** Process keyboard interrupt.

 *  

 *  @param irq IRQ information.

 *  @param arg Not used.

 */

static void qemu_icp_irq_handler(irq_t *irq, void *arg, ...)

{

    if ((irq->notif_cfg.notify) && (irq->notif_cfg.answerbox)) {

        ipc_irq_send_notif(irq);

    } else {

        char ch = 0;

        ch = *((char *) qemu_icp_hw_map.kbd);

        if (ch == '\r') {

            ch = '\n';

        }

        if (ch == 0x7f) {

            ch = '\b';

        }

        chardev_push_character(&console, ch);

    }

}

static irq_ownership_t qemu_icp_claim(void)

{

    return IRQ_ACCEPT;

}

/** Acquire console back for kernel. */

void qemu_icp_grab_console(void)

{

    ipl_t ipl = interrupts_disable();

    spinlock_lock(&qemu_icp_console_irq.lock);

    qemu_icp_console_irq.notif_cfg.notify = false;

    spinlock_unlock(&qemu_icp_console_irq.lock);

    interrupts_restore(ipl);

}

/** Return console to userspace. */

void qemu_icp_release_console(void)

{

    ipl_t ipl = interrupts_disable();

    spinlock_lock(&qemu_icp_console_irq.lock);

    if (qemu_icp_console_irq.notif_cfg.answerbox) {

        qemu_icp_console_irq.notif_cfg.notify = true;

    }

    spinlock_unlock(&qemu_icp_console_irq.lock);

    interrupts_restore(ipl);

}

/** Initializes console object representing qemu_icp console.

 *

 *  @param devno device number.

 */

void qemu_icp_console_init(devno_t devno)

{

    chardev_initialize("qemu_icp_console", &console, &qemu_icp_ops);

    stdin = &console;

    stdout = &console;

    irq_initialize(&qemu_icp_console_irq);

    qemu_icp_console_irq.devno = devno;

    qemu_icp_console_irq.inr = QEMU_ICP_KBD_IRQ;

    qemu_icp_console_irq.claim = qemu_icp_claim;

    qemu_icp_console_irq.handler = qemu_icp_irq_handler;

    irq_register(&qemu_icp_console_irq);

    qemu_icp_irqc_unmask(QEMU_ICP_KBD_IRQ);

    sysinfo_set_item_val("kbd", NULL, true);

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

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

    sysinfo_set_item_val("kbd.address.virtual", NULL, qemu_icp_hw_map.kbd);

}

/** Starts qemu_icp Real Time Clock device, which asserts regular interrupts.

 *

 * @param frequency Interrupts frequency (0 disables RTC).

 */

static void qemu_icp_timer_start(uint32_t frequency)

{

    *((uint32_t*) qemu_icp_hw_map.rtc_freq) = frequency;

}

static irq_ownership_t qemu_icp_timer_claim(void)

{

    return IRQ_ACCEPT;

}

/** Timer interrupt handler.

 *

 * @param irq Interrupt information.

 * @param arg Not used.

 */

static void qemu_icp_timer_irq_handler(irq_t *irq, void *arg, ...)

{

    /*

    * We are holding a lock which prevents preemption.

    * Release the lock, call clock() and reacquire the lock again.

    */

    spinlock_unlock(&irq->lock);

    clock();

    spinlock_lock(&irq->lock);

    /* acknowledge tick */

    *((uint32_t*) qemu_icp_hw_map.rtc_ack) = 0;

}

/** Initializes and registers timer interrupt handler. */

static void qemu_icp_timer_irq_init(void)

{

    irq_initialize(&qemu_icp_timer_irq);

    qemu_icp_timer_irq.devno = device_assign_devno();

    qemu_icp_timer_irq.inr = QEMU_ICP_TIMER_IRQ;

    qemu_icp_timer_irq.claim = qemu_icp_timer_claim;

    qemu_icp_timer_irq.handler = qemu_icp_timer_irq_handler;

    irq_register(&qemu_icp_timer_irq);

}

/** Starts timer.

 *

 * Initiates regular timer interrupts after initializing

 * corresponding interrupt handler.

 */

void qemu_icp_timer_irq_start(void)

{

    qemu_icp_timer_irq_init();

    qemu_icp_timer_start(QEMU_ICP_TIMER_FREQ);

}

/** Returns the size of emulated memory.

 *

 * @return Size in bytes.

 */

size_t qemu_icp_get_memory_size(void)

{

    //return  *((int *) (QEMU_ICP_MP + QEMU_ICP_MP_MEMSIZE_OFFSET));

    return 0x2000000;

}

/** Prints a character.

 *

 *  @param ch Character to be printed.

 */

void qemu_icp_debug_putc(char ch)

{

    char *addr = 0;

    if (!hw_map_init_called) {

        addr = (char *) QEMU_ICP_KBD;

    } else {

        addr = (char *) qemu_icp_hw_map.videoram;

    }

    if (ch == '\n')

        *(addr) = '\r';

    *(addr) = ch;

}

/** Stops qemu_icp. */

void qemu_icp_cpu_halt(void)

{

    char * addr = 0;

    if (!hw_map_init_called) {

        addr = (char *) QEMU_ICP_KBD;

    } else {

        addr = (char *) qemu_icp_hw_map.videoram;

    }

    *(addr + QEMU_ICP_HALT_OFFSET) = '\0';

}

/** Gxemul specific interrupt exception handler.

 *

 * Determines sources of the interrupt from interrupt controller and

 * calls high-level handlers for them.

 *

 * @param exc_no Interrupt exception number.

 * @param istate Saved processor state.

 */

void qemu_icp_irq_exception(int exc_no, istate_t *istate)

{

    uint32_t sources = qemu_icp_irqc_get_sources();

    int i;

    for (i = 0; i < QEMU_ICP_IRQC_MAX_IRQ; i++) {

        if (sources & (1 << i)) {

            irq_t *irq = irq_dispatch_and_lock(i);

            if (irq) {

                /* The IRQ handler was found. */

                irq->handler(irq, irq->arg);

                spinlock_unlock(&irq->lock);

            } else {

                /* Spurious interrupt.*/

                dprintf("cpu%d: spurious interrupt (inum=%d)\n",

                    CPU->id, i);

            }

        }

    }

}

/** Returns address of framebuffer device.

 *

 *  @return Address of framebuffer device.

 */

uintptr_t qemu_icp_get_fb_address(void)

{

    if (!vga_init) {

        icp_vga_init();

        vga_init = true;

    }

    return (uintptr_t) QEMU_ICP_FB;

}

/** @}

 */