/*
 * dev_fbf.c - FBF (Block Device Controler) generic device API implementation.
 * 
 * Author  Alain Greiner    (2016)
 *
 * Copyright (c) UPMC Sorbonne Universites
 *
 * This file is part of ALMOS-MK
 *
 * ALMOS-MKH.is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2.0 of the License.
 *
 * ALMOS-MKH.is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with ALMOS-kernel; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <kernel_config.h>
#include <hal_types.h>
#include <hal_gpt.h>
#include <thread.h>
#include <printk.h>
#include <string.h>
#include <chdev.h>
#include <dev_fbf.h>

/////////////////////////////////////////////////////////////////////////////////////////
// Extern global variables
/////////////////////////////////////////////////////////////////////////////////////////

extern chdev_directory_t  chdev_dir;         // allocated in kernel_init.c

////////////////////////////////////
void dev_fbf_init( chdev_t  * chdev )
{
    // set FBF chdev extension fields
    // TODO this should be done in the implementation 
    // TODO specific part, as these parameters must be obtained from the hardware.
    chdev->ext.fbf.width  = CONFIG_FBF_WIDTH;
    chdev->ext.fbf.height = CONFIG_FBF_HEIGHT;

    // get implementation 
    uint32_t  impl = chdev->impl;

    // set chdev name
    strcpy( chdev->name, "fbf" );

    // call driver init function
    if( impl == IMPL_FBF_SCL )
    {
        // TODO
    }
    else
    {
        assert( false , __FUNCTION__ , "undefined FBF device implementation" );
    }

}  // end dev_fbf_init()

/////////////////////////////////////////
void dev_fbf_get_size( uint32_t  * width,
                       uint32_t  * height )
{
    // get extended pointer on FBF chdev descriptor
    xptr_t  dev_xp = chdev_dir.fbf[0];

    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined FBF chdev descriptor" );

    // get FBF chdev cluster and local pointer
    cxy_t     dev_cxy = GET_CXY( dev_xp );
    chdev_t * dev_ptr = (chdev_t *)GET_PTR( dev_xp );

    // return values
    *width  = hal_remote_lw( XPTR( dev_cxy , &dev_ptr->ext.fbf.width ) );
    *height = hal_remote_lw( XPTR( dev_cxy , &dev_ptr->ext.fbf.height ) );

}  // end dev_fbf_get_size()

///////////////////////
error_t dev_fbf_alloc()
{
    // get extended pointer on FBF chdev descriptor
    xptr_t  dev_xp = chdev_dir.fbf[0];

    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined FBF chdev descriptor" );

    // get FBF chdev cluster and local pointer
    cxy_t     dev_cxy = GET_CXY( dev_xp );
    chdev_t * dev_ptr = (chdev_t *)GET_PTR( dev_xp );

    // try to get FBF ownership
    return remote_spinlock_trylock( XPTR( dev_cxy , &dev_ptr->wait_lock ) );

}  // end dev_fbf_alloc()

///////////////////
void dev_fbf_free()
{
    // get extended pointer on FBF chdev descriptor
    xptr_t  dev_xp = chdev_dir.fbf[0];

    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined FBF chdev descriptor" );

    // get FBF chdev cluster and local pointer
    cxy_t     dev_cxy = GET_CXY( dev_xp );
    chdev_t * dev_ptr = (chdev_t *)GET_PTR( dev_xp );

    // release FBF ownership
    remote_spinlock_unlock( XPTR( dev_cxy , &dev_ptr->wait_lock ) );

}  // end dev_fbf_free()

//////////////////////////////////////////////////////////////////////////////////
// This static function is called by dev_fbf_read() & dev_fbf_write() functions.
// It builds and registers the command in the calling thread descriptor, after
// translation of buffer virtual address to physical address. 
// Then, it registers the calling thead in the relevant DMA chdev waiting queue.
// Finally it blocks on the THREAD_BLOCKED_DEV condition and deschedule.
////////////////////////////////////i/////////////////////////////////////////////
static error_t dev_fbf_access( bool_t    to_fbf,
                               char    * buffer,
                               uint32_t  length,
                               uint32_t  offset )
{
    error_t     error;
    paddr_t     buf_paddr;

    thread_t * this = CURRENT_THREAD;              // pointer on client thread

    // Get buffer physical address
    error = vmm_v2p_translate( CONFIG_KERNEL_IDENTITY_MAP , buffer , &buf_paddr );
 
    if( error )
    {
        printk("\n[ERROR] in %s : cannot translate vaddr = %p in process %x\n",
               __FUNCTION__ , buffer , this->process->pid ); 
        return EINVAL;
    }

    fbf_dmsg("\n[DBG] %s : thread %x in process %x / vaddr = %p / paddr = %l\n", 
             __FUNCTION__ , this->trdid , this->process->pid , buffer , buf_paddr );

    // get extended pointer on FBF chdev descriptor
    xptr_t  fbf_xp = chdev_dir.fbf[0];

    assert( (fbf_xp != XPTR_NULL) , __FUNCTION__ , "undefined FBF chdev descriptor" );

    // get FBF chdev cluster and local pointer
    cxy_t     fbf_cxy = GET_CXY( fbf_xp );
    chdev_t * fbf_ptr = (chdev_t *)GET_PTR( fbf_xp );

    // get frame buffer base address, width and height
    xptr_t   base   = hal_remote_lwd( XPTR( fbf_cxy , &fbf_ptr->base ) );
    uint32_t width  = hal_remote_lw ( XPTR( fbf_cxy , &fbf_ptr->ext.fbf.width ) );
    uint32_t height = hal_remote_lw ( XPTR( fbf_cxy , &fbf_ptr->ext.fbf.height ) );

    // check offset and length versus FBF size
    if( (offset + length) > (width * height) )
    {
        printk("\n[ERROR] in %s : offset = %d / length = %d / width = %d / height = %d\n",
               __FUNCTION__ , offset , length , width , height ); 
        return EINVAL;
    }

    // compute extended pointers on frame buffer and memory buffer
    xptr_t  mem_buf_xp = XPTR( local_cxy , (void *)(intptr_t)buf_paddr );
    xptr_t  fbf_buf_xp = base + offset;

    // register command in DMA chdev
    if( to_fbf )  dev_dma_remote_memcpy( fbf_buf_xp , mem_buf_xp , length );
    else          dev_dma_remote_memcpy( mem_buf_xp , fbf_buf_xp , length );

    return 0;

}  // end dev_fbf_access()

////////////////////////////////////////////
error_t dev_fbf_read( char         * buffer,
                      uint32_t       length,
                      uint32_t       offset )
{
    return dev_fbf_access( false , buffer , length , offset ); 
}  

////////////////////////////////////////////
error_t dev_fbf_write( char         * buffer,
                       uint32_t       length,
                       uint32_t       offset )
{
    return dev_fbf_access( true , buffer , length , offset ); 
}
