source: soft/giet_vm/giet_drivers/xcu_driver.c @ 411

///////////////////////////////////////////////////////////////////////////////////
// File     : xcu_driver.c
// Date     : 23/05/2013
// Author   : alain greiner
// Copyright (c) UPMC-LIP6
///////////////////////////////////////////////////////////////////////////////////
// This peripheral is replicated in all clusters containing processors.
//
// SEG_XCU_BASE and PERI_CLUSTER_INCREMENT must be defined in hard_config.h file.
///////////////////////////////////////////////////////////////////////////////////

#include <hard_config.h>
#include <giet_config.h>
#include <xcu_driver.h>
#include <tty_driver.h>
#include <mapping_info.h>
#include <utils.h>
#include <io.h>

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

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

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

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

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

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

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

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

///////////////////////////////////////////////////////////////////////////////
// This low level function returns the value contained in register "index"
// in the XCU component contained in cluster "cluster_xy"
///////////////////////////////////////////////////////////////////////////////
static
unsigned int _xcu_get_register( unsigned int cluster_xy, // cluster index
                                unsigned int func,       // function index
                                unsigned int index )     // register index
{
    unsigned int vaddr =
        SEG_XCU_BASE + 
        (cluster_xy * PERI_CLUSTER_INCREMENT) +
        (XCU_REG(func, index) << 2);

    return ioread32( (void*)vaddr );
}

///////////////////////////////////////////////////////////////////////////////
// This low level function sets a new value in register "index"
// in the XCU component contained in cluster "cluster_xy"
///////////////////////////////////////////////////////////////////////////////
static
void _xcu_set_register( unsigned int cluster_xy,       // cluster index
                        unsigned int func,             // func index
                        unsigned int index,            // register index
                        unsigned int value )           // value to be written
{
    unsigned int vaddr =
        SEG_XCU_BASE + 
        (cluster_xy * PERI_CLUSTER_INCREMENT) +
        (XCU_REG(func, index) << 2);
        
    iowrite32( (void*)vaddr, value );
}

////////////////////////////////////////////////////////////////////////////////
// This function set the mask register for the IRQ type defined by "irq_type",
// and for the channel identified by the "cluster_xy" and "channel" arguments.
// All '1' bits are set / all '0' bits are not modified.
////////////////////////////////////////////////////////////////////////////////
void _xcu_set_mask( unsigned int cluster_xy, 
                    unsigned int channel,  
                    unsigned int value,
                    unsigned int irq_type ) 
{
#if USE_XCU
    // parameters checking 
    unsigned int x = cluster_xy >> Y_WIDTH;
    unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1);
    if (x >= X_SIZE)                                   _exit(); 
    if (y >= Y_SIZE)                                   _exit(); 
    if (channel >= (NB_PROCS_MAX * IRQ_PER_PROCESSOR)) _exit(); 

    unsigned int func = 0;
    if      (irq_type == IRQ_TYPE_PTI) func = XCU_MSK_PTI_ENABLE;
    else if (irq_type == IRQ_TYPE_WTI) func = XCU_MSK_WTI_ENABLE;
    else if (irq_type == IRQ_TYPE_HWI) func = XCU_MSK_HWI_ENABLE;
    else
    { 
        _printf("[GIET ERROR] _xcu_set_mask() receives illegal IRQ type\n");
        _exit();
    }

    _xcu_set_register(cluster_xy, func, channel, value);

#else
    _printf("[GIET ERROR] _xcu_set_mask() should not be used if USE_XCU not set\n");
    _exit();
#endif
}

////////////////////////////////////////////////////////////////////////////////
// This function returns the index and the type of the highest priority 
// - active PTI (Timer Interrupt), then
// - active HWI (Hardware Interrupt), then
// - active WTI (Software Interrupt)
// As the hardware can define more than one IRQ per processor, but the GIET
// use only one, channel = lpid * IRQ_PER_PROCESSOR.
////////////////////////////////////////////////////////////////////////////////
void _xcu_get_index( unsigned int cluster_xy, 
                     unsigned int channel,   
                     unsigned int * index, 
                     unsigned int * irq_type )
{
#if USE_XCU
    // parameters checking 
    unsigned int x = cluster_xy >> Y_WIDTH;
    unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1);
    if (x >= X_SIZE)                                   _exit(); 
    if (y >= Y_SIZE)                                   _exit(); 
    if (channel >= (NB_PROCS_MAX * IRQ_PER_PROCESSOR)) _exit(); 

    unsigned int prio = _xcu_get_register(cluster_xy, XCU_PRIO, channel);
    unsigned int pti_ok = (prio & 0x00000001);
    unsigned int hwi_ok = (prio & 0x00000002);
    unsigned int wti_ok = (prio & 0x00000004);
    unsigned int pti_id = (prio & 0x00001F00) >> 8;
    unsigned int hwi_id = (prio & 0x001F0000) >> 16;
    unsigned int wti_id = (prio & 0x1F000000) >> 24;
    if      (pti_ok)
    {
        *index    = pti_id;
        *irq_type = IRQ_TYPE_PTI;
    }
    else if (hwi_ok)
    {
        *index    = hwi_id;
        *irq_type = IRQ_TYPE_HWI;
    }
    else if (wti_ok) 
    {
        *index    = wti_id;
        *irq_type = IRQ_TYPE_WTI;
    }
    else 
    {
        *index = 32;
    }
 
#else
    _printf("[GIET ERROR] _xcu_get_index should not be used if USE_XCU is not set\n");
    _exit();
#endif
}

////////////////////////////////////////////////////////////////////////////////
// This function writes the "wdata" value in the mailbox defined 
// by the "cluster_xy" and "wti_index" arguments.
////////////////////////////////////////////////////////////////////////////////
void _xcu_send_wti( unsigned int cluster_xy,
                    unsigned int wti_index,
                    unsigned int wdata )
{ 
#if USE_XCU
    // parameters checking 
    unsigned int x = cluster_xy >> Y_WIDTH;
    unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1);
    if (x >= X_SIZE)               _exit(); 
    if (y >= Y_SIZE)               _exit(); 
    if (wti_index >= 32)           _exit(); 

    _xcu_set_register(cluster_xy, XCU_WTI_REG, wti_index, wdata);

#else
    _printf("[GIET ERROR] _xcu_send_wti() should not be used if USE_XCU is not set\n");
    _exit();
#endif
} 

////////////////////////////////////////////////////////////////////////////////
// This function returns the value contained in a WTI mailbox defined by
// the cluster_xy and "wti_index" arguments. This value is written in
// the "value" argument, and the corresponding WTI is acknowledged.
// returns 0 if success, > 0 if error.
////////////////////////////////////////////////////////////////////////////////
void _xcu_get_wti_value( unsigned int   cluster_xy,
                         unsigned int   wti_index,
                         unsigned int * value )
{
#if USE_XCU
    // parameters checking 
    unsigned int x = cluster_xy >> Y_WIDTH;
    unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1);
    if (x >= X_SIZE)               _exit(); 
    if (y >= Y_SIZE)               _exit(); 
    if (wti_index >= 32)           _exit(); 
 
    *value = _xcu_get_register(cluster_xy, XCU_WTI_REG, wti_index);

#else
    _printf("[GIET ERROR] in _xcu_get_wti_value() USE_XCU is not set\n");
    _exit();
#endif
}

////////////////////////////////////////////////////////////////////////////////
// This function returns the address of a WTI mailbox defined by
// the "wti_index" argument, in the unsigned int "address" argument.
// It is used by the GIET to configurate the IOPIC component.
// There is no access to a specific XCU component in a specific cluster.
// returns 0 if success, > 0 if error.
////////////////////////////////////////////////////////////////////////////////
void _xcu_get_wti_address( unsigned int   wti_index,
                           unsigned int * address )
{
#if USE_XCU
    if (wti_index >= 32)           _exit(); 
 
    *address = SEG_XCU_BASE + (XCU_REG(XCU_WTI_REG, wti_index)<<2); 

#else
    _printf("[GIET ERROR] in _xcu_get_wti_address() USE_XCU is not set\n");
    _exit();
#endif
}

////////////////////////////////////////////////////////////////////////////////
// This function activates a timer contained in XCU by writing in the
// proper register the period value.
////////////////////////////////////////////////////////////////////////////////
void _xcu_timer_start( unsigned int cluster_xy,
                       unsigned int pti_index,
                       unsigned int period )
{
#if USE_XCU
    // parameters checking 
    unsigned int x = cluster_xy >> Y_WIDTH;
    unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1);
    if (x >= X_SIZE)             _exit(); 
    if (y >= Y_SIZE)             _exit(); 

    _xcu_set_register(cluster_xy, XCU_PTI_PER, pti_index, period);

#else
    _printf("[GIET ERROR] in _xcu_timer_start() USE_XCU is not set\n");
    _exit();
#endif
}

//////////////////////////////////////////////////////////////////////////////
// This function desactivates a timer in XCU component
// by writing in the proper register.
//////////////////////////////////////////////////////////////////////////////
void _xcu_timer_stop( unsigned int cluster_xy, 
                      unsigned int pti_index) 
{
#if USE_XCU
    // parameters checking 
    unsigned int x = cluster_xy >> Y_WIDTH;
    unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1);
    if (x >= X_SIZE)             _exit(); 
    if (y >= Y_SIZE)             _exit(); 

    _xcu_set_register(cluster_xy, XCU_PTI_PER, pti_index, 0);

#else
    _printf("[GIET ERROR] in _xcu_timer_stop() USE_XCU is not set\n");
    _exit();
#endif
}

//////////////////////////////////////////////////////////////////////////////
// This function acknowlegge a timer interrupt in XCU 
// component by reading in the proper XCU register.
// It can be used by both the isr_switch() for a "system" timer, 
// or by the _isr_timer() for an "user" timer.
//////////////////////////////////////////////////////////////////////////////
unsigned int _xcu_timer_reset_irq( unsigned int cluster_xy, 
                                   unsigned int pti_index ) 
{
#if USE_XCU
    // parameters checking 
    unsigned int x = cluster_xy >> Y_WIDTH;
    unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1);
    if (x >= X_SIZE)             _exit(); 
    if (y >= Y_SIZE)             _exit(); 

    // This return value is not used / avoid a compilation warning.
    return _xcu_get_register(cluster_xy, XCU_PTI_ACK, pti_index);

#else
    _printf("[GIET ERROR] in _xcu_timer_reset_irq() USE_XCU is not set\n");
    _exit();
    return 0;
#endif
}

//////////////////////////////////////////////////////////////////////////////
// This function resets a timer counter. To do so, we re-write the period
// in the proper register, what causes the count to restart.
// The period value is read from the same (TIMER_PERIOD) register,
// this is why in appearance we do nothing useful (read a value
// from a register and write this value in the same register).
// This function is called during a context switch (user or preemptive)
/////////////////////////////////////////////////////////////////////////////
void _xcu_timer_reset_cpt( unsigned int cluster_xy, 
                           unsigned int pti_index ) 
{
#if USE_XCU
    // parameters checking 
    unsigned int x = cluster_xy >> Y_WIDTH;
    unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1);
    if (x >= X_SIZE)             _exit(); 
    if (y >= Y_SIZE)             _exit(); 

    unsigned int per = _xcu_get_register(cluster_xy, XCU_PTI_PER, pti_index);

    // we write 0 first because if the timer is currently running, 
    // the corresponding timer counter is not reset
    _xcu_set_register(cluster_xy, XCU_PTI_PER, pti_index, 0);
    _xcu_set_register(cluster_xy, XCU_PTI_PER, pti_index, per);

#else
    _printf("[GIET ERROR] in _xcu_timer_reset_cpt() USE_XCU is not set\n");
    _exit();
#endif
}


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