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/*

 * Copyright (c) 2009 Jiri Svoboda

 * 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 bd

 * @{

 */

/**

 * @file

 * @brief GXemul disk driver

 */

#include <stdio.h>

#include <libarch/ddi.h>

#include <ddi.h>

#include <ipc/ipc.h>

#include <ipc/bd.h>

#include <async.h>

#include <as.h>

#include <futex.h>

#include <devmap.h>

#include <sys/types.h>

#include <errno.h>

#define NAME "gxe_bd"

enum {

    CTL_READ_START  = 0,

    CTL_WRITE_START = 1,

};

enum {

    STATUS_FAILURE  = 0

};

enum {

    MAX_DISKS   = 2

};

typedef struct {

    uint32_t offset_lo;

    uint32_t pad0;

    uint32_t offset_hi;

    uint32_t pad1;

    uint32_t disk_id;

    uint32_t pad2[3];

    uint32_t control;

    uint32_t pad3[3];

    uint32_t status;

    uint32_t pad4[3];

    uint8_t pad5[0x3fc0];

    uint8_t buffer[512];

} gxe_bd_t;

static const size_t block_size = 512;

static size_t comm_size;

static uintptr_t dev_physical = 0x13000000;

static gxe_bd_t *dev;

static dev_handle_t dev_handle[MAX_DISKS];

static atomic_t dev_futex = FUTEX_INITIALIZER;

static int gxe_bd_init(void);

static void gxe_bd_connection(ipc_callid_t iid, ipc_call_t *icall);

static int gx_bd_rdwr(int disk_id, ipcarg_t method, off_t offset, size_t size,

    void *buf);

static int gxe_bd_read_block(int disk_id, uint64_t offset, size_t size,

    void *buf);

static int gxe_bd_write_block(int disk_id, uint64_t offset, size_t size,

    const void *buf);

int main(int argc, char **argv)

{

    printf(NAME ": GXemul disk driver\n");

    if (gxe_bd_init() != EOK)

        return -1;

    printf(NAME ": Accepting connections\n");

    async_manager();

    /* Not reached */

    return 0;

}

static int gxe_bd_init(void)

{

    void *vaddr;

    int rc, i;

    char name[16];

    rc = devmap_driver_register(NAME, gxe_bd_connection);

    if (rc < 0) {

        printf(NAME ": Unable to register driver.\n");

        return rc;

    }

    rc = pio_enable((void *) dev_physical, sizeof(gxe_bd_t), &vaddr);

    if (rc != EOK) {

        printf(NAME ": Could not initialize device I/O space.\n");

        return rc;

    }

    dev = vaddr;

    for (i = 0; i < MAX_DISKS; i++) {

        snprintf(name, 16, "disk%d", i);

        rc = devmap_device_register(name, &dev_handle[i]);

        if (rc != EOK) {

            devmap_hangup_phone(DEVMAP_DRIVER);

            printf(NAME ": Unable to register device %s.\n",

                name);

            return rc;

        }

    }

    return EOK;

}

static void gxe_bd_connection(ipc_callid_t iid, ipc_call_t *icall)

{

    void *fs_va = NULL;

    ipc_callid_t callid;

    ipc_call_t call;

    ipcarg_t method;

    dev_handle_t dh;

    int flags;

    int retval;

    off_t idx;

    size_t size;

    int disk_id, i;

    /* Get the device handle. */

    dh = IPC_GET_ARG1(*icall);

    /* Determine which disk device is the client connecting to. */

    disk_id = -1;

    for (i = 0; i < MAX_DISKS; i++)

        if (dev_handle[i] == dh)

            disk_id = i;

    if (disk_id < 0) {

        ipc_answer_0(iid, EINVAL);

        return;

    }

    /* Answer the IPC_M_CONNECT_ME_TO call. */

    ipc_answer_0(iid, EOK);

    if (!ipc_share_out_receive(&callid, &comm_size, &flags)) {

        ipc_answer_0(callid, EHANGUP);

        return;

    }

    fs_va = as_get_mappable_page(comm_size);

    if (fs_va == NULL) {

        ipc_answer_0(callid, EHANGUP);

        return;

    }

    (void) ipc_share_out_finalize(callid, fs_va);

    while (1) {

        callid = async_get_call(&call);

        method = IPC_GET_METHOD(call);

        switch (method) {

        case IPC_M_PHONE_HUNGUP:

            /* The other side has hung up. */

            ipc_answer_0(callid, EOK);

            return;

        case BD_READ_BLOCK:

        case BD_WRITE_BLOCK:

            idx = IPC_GET_ARG1(call);

            size = IPC_GET_ARG2(call);

            if (size > comm_size) {

                retval = EINVAL;

                break;

            }

            retval = gx_bd_rdwr(disk_id, method, idx * size,

                size, fs_va);

            break;

        default:

            retval = EINVAL;

            break;

        }

        ipc_answer_0(callid, retval);

    }

}

static int gx_bd_rdwr(int disk_id, ipcarg_t method, off_t offset, size_t size,

    void *buf)

{

    int rc;

    size_t now;

    while (size > 0) {

        now = size < block_size ? size : block_size;

        if (method == BD_READ_BLOCK)

            rc = gxe_bd_read_block(disk_id, offset, now, buf);

        else

            rc = gxe_bd_write_block(disk_id, offset, now, buf);

        if (rc != EOK)

            return rc;

        buf += block_size;

        offset += block_size;

        if (size > block_size)

            size -= block_size;

        else

            size = 0;

    }

    return EOK;

}

static int gxe_bd_read_block(int disk_id, uint64_t offset, size_t size,

    void *buf)

{

    uint32_t status;

    size_t i;

    uint32_t w;

    futex_down(&dev_futex);

    pio_write_32(&dev->offset_lo, (uint32_t) offset);

    pio_write_32(&dev->offset_hi, offset >> 32);

    pio_write_32(&dev->disk_id, disk_id);

    pio_write_32(&dev->control, CTL_READ_START);

    status = pio_read_32(&dev->status);

    if (status == STATUS_FAILURE) {

        return EIO;

    }

    for (i = 0; i < size; i++) {

        ((uint8_t *) buf)[i] = w = pio_read_8(&dev->buffer[i]);

    }

    futex_up(&dev_futex);

    return EOK;

}

static int gxe_bd_write_block(int disk_id, uint64_t offset, size_t size,

    const void *buf)

{

    uint32_t status;

    size_t i;

    for (i = 0; i < size; i++) {

        pio_write_8(&dev->buffer[i], ((const uint8_t *) buf)[i]);

    }

    futex_down(&dev_futex);

    pio_write_32(&dev->offset_lo, (uint32_t) offset);

    pio_write_32(&dev->offset_hi, offset >> 32);

    pio_write_32(&dev->disk_id, disk_id);

    pio_write_32(&dev->control, CTL_WRITE_START);

    status = pio_read_32(&dev->status);

    if (status == STATUS_FAILURE) {

        return EIO;

    }

    futex_up(&dev_futex);

    return EOK;

}

/**

 * @}

 */