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/*

 * Copyright (c) 2006 Ondrej Palkovsky

 * Copyright (c) 2008 Martin Decky

 * Copyright (c) 2008 Pavel Rimsky

 * 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.

 */

/** @defgroup sgcnfb SGCN

 * @brief   userland driver of the Serengeti console output

 * @{

 */

/** @file

 */

#include <async.h>

#include <ipc/ipc.h>

#include <ipc/fb.h>

#include <sysinfo.h>

#include <as.h>

#include <errno.h>

#include <stdio.h>

#include <ddi.h>

#include "serial_console.h"

#include "sgcn.h"

#define WIDTH 80

#define HEIGHT 24

/**

 * Virtual address mapped to SRAM.

 */

static uintptr_t sram_virt_addr;

/**

 * SGCN buffer offset within SGCN.

 */

static uintptr_t sram_buffer_offset;

/* Allow only 1 connection */

static int client_connected = 0;

/**

 * SGCN buffer header. It is placed at the very beginning of the SGCN

 * buffer.

 */

typedef struct {

    /** hard-wired to "CON" */

    char magic[4];

    /** we don't need this */

    char unused[24];

    /** offset within the SGCN buffer of the output buffer start */

    uint32_t out_begin;

    /** offset within the SGCN buffer of the output buffer end */

    uint32_t out_end;

    /** offset within the SGCN buffer of the output buffer read pointer */

    uint32_t out_rdptr;

    /** offset within the SGCN buffer of the output buffer write pointer */

    uint32_t out_wrptr;

} __attribute__ ((packed)) sgcn_buffer_header_t;

/*

 * Returns a pointer to the object of a given type which is placed at the given

 * offset from the console buffer beginning.

 */

#define SGCN_BUFFER(type, offset) \

        ((type *) (sram_virt_addr + sram_buffer_offset + (offset)))

/** Returns a pointer to the console buffer header. */

#define SGCN_BUFFER_HEADER  (SGCN_BUFFER(sgcn_buffer_header_t, 0))

/**

 * Pushes the character to the SGCN serial.

 * @param c character to be pushed

 */

static void sgcn_putc(char c)

{

    uint32_t begin = SGCN_BUFFER_HEADER->out_begin;

    uint32_t end = SGCN_BUFFER_HEADER->out_end;

    uint32_t size = end - begin;

    /* we need pointers to volatile variables */

    volatile char *buf_ptr = (volatile char *)

        SGCN_BUFFER(char, SGCN_BUFFER_HEADER->out_wrptr);

    volatile uint32_t *out_wrptr_ptr = &(SGCN_BUFFER_HEADER->out_wrptr);

    volatile uint32_t *out_rdptr_ptr = &(SGCN_BUFFER_HEADER->out_rdptr);

    uint32_t new_wrptr = (((*out_wrptr_ptr) - begin + 1) % size) + begin;

    while (*out_rdptr_ptr == new_wrptr)

        ;

    *buf_ptr = c;

    *out_wrptr_ptr = new_wrptr;

}

/**

 * Main function of the thread serving client connections.

 */

static void sgcn_client_connection(ipc_callid_t iid, ipc_call_t *icall)

{

    int retval;

    ipc_callid_t callid;

    ipc_call_t call;

    char c;

    int lastcol = 0;

    int lastrow = 0;

    int newcol;

    int newrow;

    int fgcolor;

    int bgcolor;

    int i;

    if (client_connected) {

        ipc_answer_0(iid, ELIMIT);

        return;

    }

    client_connected = 1;

    ipc_answer_0(iid, EOK);

    /* Clear the terminal, set scrolling region

       to 0 - 24 lines */

    serial_clrscr();

    serial_goto(0, 0);

    serial_puts("\033[0;24r");

    while (true) {

        callid = async_get_call(&call);

        switch (IPC_GET_METHOD(call)) {

        case IPC_M_PHONE_HUNGUP:

            client_connected = 0;

            ipc_answer_0(callid, EOK);

            return;

        case FB_PUTCHAR:

            c = IPC_GET_ARG1(call);

            newrow = IPC_GET_ARG2(call);

            newcol = IPC_GET_ARG3(call);

            if ((lastcol != newcol) || (lastrow != newrow))

                serial_goto(newrow, newcol);

            lastcol = newcol + 1;

            lastrow = newrow;

            sgcn_putc(c);

            retval = 0;

            break;

        case FB_CURSOR_GOTO:

            newrow = IPC_GET_ARG1(call);

            newcol = IPC_GET_ARG2(call);

            serial_goto(newrow, newcol);

            lastrow = newrow;

            lastcol = newcol;

            retval = 0;

            break;

        case FB_GET_CSIZE:

            ipc_answer_2(callid, EOK, HEIGHT, WIDTH);

            continue;

        case FB_CLEAR:

            serial_clrscr();

            retval = 0;

            break;

        case FB_SET_STYLE:

            fgcolor = IPC_GET_ARG1(call);

            bgcolor = IPC_GET_ARG2(call);

            if (fgcolor < bgcolor)

                serial_set_style(0);

            else

                serial_set_style(7);

            retval = 0;

            break;

        case FB_SCROLL:

            i = IPC_GET_ARG1(call);

            if ((i > HEIGHT) || (i < -HEIGHT)) {

                retval = EINVAL;

                break;

            }

            serial_scroll(i);

            serial_goto(lastrow, lastcol);

            retval = 0;

            break;

        case FB_CURSOR_VISIBILITY:

            if(IPC_GET_ARG1(call))

                serial_cursor_enable();

            else

                serial_cursor_disable();

            retval = 0;

            break;

        default:

            retval = ENOENT;

        }

        ipc_answer_0(callid, retval);

    }

}

/**

 * Initializes the SGCN serial driver.

 */

int sgcn_init(void)

{

    sram_virt_addr = (uintptr_t) as_get_mappable_page(

        sysinfo_value("sram.area.size"));

    int result = physmem_map(

        (void *) sysinfo_value("sram.address.physical"),

        (void *) sram_virt_addr,

        sysinfo_value("sram.area.size") / PAGE_SIZE,

        AS_AREA_READ | AS_AREA_WRITE

        );

    if (result != 0) {

        printf("SGCN: uspace driver couldn't map physical memory: %d\n",

            result);

    }

    serial_console_init(sgcn_putc, WIDTH, HEIGHT);

    sram_buffer_offset = sysinfo_value("sram.buffer.offset");

    async_set_client_connection(sgcn_client_connection);

    return 0;

}

/**

 * @}

 */