source: soft/giet_vm/giet_drivers/ioc_driver.c @ 503

///////////////////////////////////////////////////////////////////////////////////
// File       : ioc_driver.c
// Date       : 23/05/2013
// Author     : alain greiner
// Maintainer : cesar fuguet
// Copyright (c) UPMC-LIP6
///////////////////////////////////////////////////////////////////////////////////
// Implementation notes:
// 1) In order to share the code, the two _ioc_read() and _ioc_write() functions
// call the same _ioc_access() function, and this function call the selected
// physical driver (BDV / HBA / SPI / RDK).
// 2) The IOMMU is not supported yet, but the method is the following:
// A fixed size 2 Mbytes vseg is allocated to the IOC peripheral, in the I/O 
// virtual space, and the user buffer is dynamically remapped to one single
// big page in the IOMMU page table.
// The user buffer is unmapped by the _ioc_completed() function when 
// the transfer is completed.
///////////////////////////////////////////////////////////////////////////////////

#include <giet_config.h>
#include <ioc_driver.h>
#include <bdv_driver.h>
#include <hba_driver.h>
#include <sdc_driver.h>
#include <rdk_driver.h>
#include <utils.h>
#include <tty0.h>
#include <iob_driver.h>
#include <ctx_handler.h>
#include <mmc_driver.h>
#include <vmem.h>

#if !defined( SEG_IOC_BASE )
# error: You must define SEG_IOC_BASE in the hard_config.h file
#endif

#if !defined( USE_IOB )
# error: You must define USE_IOB in the hard_config.h file
#endif

#if !defined(GIET_USE_IOMMU) 
# error: You must define GIET_USE_IOMMU in the giet_config.h file
#endif

#if (USE_IOC_BDV + USE_IOC_SPI + USE_IOC_HBA + USE_IOC_RDK) != 1
# error: You must use only one IOC controller type (BDV or SPI or HBA or RDK)
#endif

#if USE_IOC_BDV
# include <bdv_driver.h>
#endif

#if USE_IOC_SPI
# include <sdc_driver.h>
#endif

#if USE_IOC_HBA
# include <hba_driver.h>
#endif

#if USE_IOC_RDK
# include <rdk_driver.h>
#endif

///////////////////////////////////////////////////////////////////////////////
// IOC global variables
///////////////////////////////////////////////////////////////////////////////

__attribute__((section (".kdata")))
volatile unsigned int _ioc_iommu_ix1 = 0;

__attribute__((section (".kdata")))
volatile unsigned int _ioc_iommu_npages; 

///////////////////////////////////////////////////////////////////////////////
// This function transfer data between a memory buffer and the block device.
// The buffer lentgth is (count*block_size) bytes.
// Arguments are:
// - to_mem     : from external storage to memory when non 0.
// - mode       : BOOT_PA / BOOT_VA / KERNEL / USER 
// - lba        : first block index on the external storage.
// - buf_vaddr  : virtual base address of the memory buffer.
// - count      : number of blocks to be transfered.
// Returns 0 if success, > 0 if error.
///////////////////////////////////////////////////////////////////////////////
static unsigned int _ioc_access( unsigned int to_mem,
                                 unsigned int channel,
                                 unsigned int mode,
                                 unsigned int lba,
                                 unsigned int buf_vaddr,
                                 unsigned int count) 
{

#if GIET_DEBUG_IOC_DRIVER
unsigned int procid  = _get_procid();
unsigned int x       = procid >> (Y_WIDTH + P_WIDTH);
unsigned int y       = (procid >> P_WIDTH) & ((1<<Y_WIDTH)-1);
unsigned int p       = procid & ((1<<P_WIDTH)-1);
_printf("\n[IOC DEBUG] _ioc_access() : P[%d,%d,%d] enters at cycle %d\n"
        " - channel  = %d\n"
        " - mode     = %d\n"
        " - vaddr    = %x\n"
        " - sectors  = %d\n"
        " - lba      = %x\n",
        x, y , p, _get_proctime(), channel, mode, buf_vaddr, count, lba );
#endif

    unsigned int error;            // return value
    unsigned int pt_vbase;         // page table vbase address
    unsigned int ppn;              // user buffer first page PPN
    unsigned int flags;            // user buffer protection flags
    paddr_t      buf_paddr;        // user buffer physical address (if no IOMMU),

    // check buffer alignment
    if ((unsigned int) buf_vaddr & 0x3)
    {
        _puts("\n[IOC ERROR] in _ioc_access() : buffer not word aligned\n");
        _exit(); 
    }

    // check channel 
    if ( (USE_IOC_HBA == 0) && (channel > 0) )
    {
        _puts("\n[IOC ERROR] in _ioc_access() : channel must be 0 when HBA not used\n");
        _exit(); 
    }

    unsigned int length = count << 9;  // count * 512 bytes

    // computing memory buffer physical address
    if ( (mode == IOC_BOOT_MODE) && ((_get_mmu_mode() & 0x4) == 0) ) // identity
    {
        buf_paddr = (paddr_t)buf_vaddr;
    }
    else                                                 // V2P translation required
    {
        // get page table virtual address
        pt_vbase = _get_context_slot(CTX_PTAB_ID);

        // get user buffer first page ppn and flags
        _v2p_translate( (page_table_t*)pt_vbase,
                        buf_vaddr >> 12,
                        &ppn,
                        &flags );

        // check access rights
        if ( (mode == IOC_USER_MODE) && ((flags & PTE_U) == 0) )
        {
            _puts("\n[IOC ERROR] in _ioc_access() : buffer not user accessible\n");
            _exit(); 
        }

        if ( ((flags & PTE_W) == 0 ) && to_mem )
        {
            _puts("\n[IOC ERROR] in _ioc_access() : buffer not writable\n");
            _exit(); 
        }

        buf_paddr = (((paddr_t)ppn) << 12) | (buf_vaddr & 0xFFF);
    }

    // cache coherence for both L1 & L2 caches

    if ( to_mem ) // memory write : invalidate data caches 
    {
        // L1 cache (only if L1 cache coherence not guaranteed by hardware)
        if ( GIET_NO_HARD_CC ) _dcache_buf_invalidate( buf_vaddr, length );

        // L2 cache (only if we use an IO-Bridge component in architecture))
        if ( USE_IOB ) _mmc_inval( buf_paddr, length );
    }
    else         // memory read : update data caches
    {
        // L1 cache : nothing to do for L1 write-through

        // L2 cache (only if we use an IO-Bridge component in architecture))
        if ( USE_IOB ) _mmc_sync( buf_paddr, length );
    }

    // select the proper physical device 

#if   ( USE_IOC_BDV )
        if (to_mem) error = _bdv_read ( mode, lba, buf_paddr, count);
        else        error = _bdv_write( mode, lba, buf_paddr, count);
#elif ( USE_IOC_SPI )
        if (to_mem) error = _sdc_read (mode, lba, buf_paddr, count);
        else        error = _sdc_write(mode, lba, buf_paddr, count);
#elif ( USE_IOC_HBA )
        if (to_mem) error = _hba_read (channel, mode, lba, buf_paddr, count);
        else        error = _hba_write(channel, mode, lba, buf_paddr, count);
#elif ( USE_IOC_RDK )
        if (to_mem) error = _rdk_read (lba, buf_vaddr, count);
        else        error = _rdk_write(lba, buf_vaddr, count);
#endif

    return error;
} // end _ioc_access()

//////////////////////////////////////////////
unsigned int _ioc_init( unsigned int channel )
{

#if   ( USE_IOC_BDV ) 

    return _bdv_init();

#elif ( USE_IOC_SPI ) 

    return _sdc_init();
    
#elif ( USE_IOC_HBA ) 

    return _hba_init( channel );
    
#elif ( USE_IOC_RDK ) 

    return _rdk_init();
    
#endif
    
}

//////////////////////////////////////////////
unsigned int _ioc_read( unsigned int channel,
                        unsigned int mode,  
                        unsigned int lba, 
                        void*        buffer, 
                        unsigned int count) 
{
    return _ioc_access( 1,        // read access
                        channel,
                        mode,  
                        lba,
                        (unsigned int) buffer,
                        count );
}

//////////////////////////////////////////////
unsigned int _ioc_write( unsigned int channel,
                         unsigned int mode,  
                         unsigned int lba, 
                         const void*  buffer, 
                         unsigned int count ) 
{
    return _ioc_access( 0,        // write access
                        channel,
                        mode,  
                        lba,
                        (unsigned int) buffer,
                        count );
}

/////////////////////////////////////////////////////
unsigned int _ioc_get_status( unsigned int  channel )
{

#if   ( USE_IOC_BDV ) 

    return _bdv_get_status( );

#elif ( USE_IOC_SPI ) 

    return _sdc_get_status( );

#elif ( USE_IOC_HBA ) 

    return _hba_get_status( channel );

#elif ( USE_IOC_RDK )

    return _rdk_get_status();

#endif

}

//////////////////////////////////
unsigned int _ioc_get_block_size() 
{

#if   ( USE_IOC_BDV ) 

    return _bdv_get_block_size();
    
#elif ( USE_IOC_SPI ) 

    return _sdc_get_block_size();
    
#elif ( USE_IOC_HBA ) 

    return _hba_get_block_size();
    
#elif ( USE_IOC_RDK ) 

    return 512;

#endif

}


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