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/**
* @file
*
* LEON3 SMP BSP Support
*/
/*
* COPYRIGHT (c) 1989-2011.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#include <rtems.h>
#include <bsp.h>
#include <rtems/bspIo.h>
#include <rtems/bspsmp.h>
#include <stdlib.h>
#define RTEMS_DEBUG
static inline void sparc_leon3_set_cctrl( unsigned int val )
{
__asm__ volatile( "sta %0, [%%g0] 2" : : "r" (val) );
}
static inline unsigned int sparc_leon3_get_cctrl( void )
{
unsigned int v = 0;
__asm__ volatile( "lda [%%g0] 2, %0" : "=r" (v) : "0" (v) );
return v;
}
rtems_isr bsp_ap_ipi_isr(
rtems_vector_number vector
)
{
LEON_Clear_interrupt(LEON3_MP_IRQ);
rtems_smp_process_interrupt();
}
void bsp_smp_secondary_cpu_initialize(int cpu)
{
sparc_leon3_set_cctrl( 0x80000F );
LEON_Unmask_interrupt(LEON3_MP_IRQ);
LEON3_IrqCtrl_Regs->mask[cpu] |= 1 << LEON3_MP_IRQ;
}
/*
* Used to pass information to start.S when bringing secondary CPUs
* out of reset.
*/
void *bsp_ap_stack;
void *bsp_ap_entry;
static void bsp_smp_delay( int );
int bsp_smp_initialize(
int maximum
)
{
int cpu;
int found_cpus = 0;
sparc_leon3_set_cctrl( 0x80000F );
found_cpus =
((LEON3_IrqCtrl_Regs->mpstat >> LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1;
#if defined(RTEMS_DEBUG)
printk( "Found %d CPUs\n", found_cpus );
#endif
if ( found_cpus > rtems_configuration_smp_maximum_processors ) {
printk(
"%d CPUs IS MORE THAN CONFIGURED -- ONLY USING %d\n",
found_cpus,
rtems_configuration_smp_maximum_processors
);
found_cpus = rtems_configuration_smp_maximum_processors;
}
if ( found_cpus == 1 )
return 1;
for ( cpu=1 ; cpu < found_cpus ; cpu++ ) {
#if defined(RTEMS_DEBUG)
printk( "Waking CPU %d\n", cpu );
#endif
bsp_ap_stack = _Per_CPU_Information[cpu].interrupt_stack_high -
CPU_MINIMUM_STACK_FRAME_SIZE;
bsp_ap_entry = rtems_smp_secondary_cpu_initialize;
LEON3_IrqCtrl_Regs->mpstat = 1 << cpu;
bsp_smp_delay( 1000000 );
#if defined(RTEMS_DEBUG)
printk(
"CPU %d is %s\n",
cpu,
((_Per_CPU_Information[cpu].state == RTEMS_BSP_SMP_CPU_INITIALIZED) ?
"online" : "offline")
);
#endif
}
if ( found_cpus > 1 ) {
LEON_Unmask_interrupt(LEON3_MP_IRQ);
set_vector(bsp_ap_ipi_isr, LEON_TRAP_TYPE(LEON3_MP_IRQ), 1);
}
return found_cpus;
}
void bsp_smp_interrupt_cpu(
int cpu
)
{
/* send interrupt to destination CPU */
LEON3_IrqCtrl_Regs->force[cpu] = 1 << LEON3_MP_IRQ;
}
void bsp_smp_broadcast_interrupt(void)
{
int dest_cpu;
int cpu;
int max_cpus;
cpu = bsp_smp_processor_id();
max_cpus = rtems_smp_get_number_of_processors();
for ( dest_cpu=0 ; dest_cpu < max_cpus ; dest_cpu++ ) {
if ( cpu == dest_cpu )
continue;
bsp_smp_interrupt_cpu( dest_cpu );
/* this is likely needed due to the ISR code not being SMP aware yet */
bsp_smp_delay( 100000 );
}
}
extern __inline__ void __delay(unsigned long loops)
{
__asm__ __volatile__("cmp %0, 0\n\t"
"1: bne 1b\n\t"
"subcc %0, 1, %0\n" :
"=&r" (loops) :
"0" (loops) :
"cc"
);
}
/*
* Kill time without depending on the timer being present or programmed.
*
* This is not very sophisticated.
*/
void bsp_smp_delay( int max )
{
__delay( max );
}
void bsp_smp_wait_for(
volatile unsigned int *address,
unsigned int desired,
int maximum_usecs
)
{
int iterations;
volatile unsigned int *p = address;
for (iterations=0 ; iterations < maximum_usecs ; iterations++ ) {
if ( *p == desired )
break;
bsp_smp_delay( 5000 );
}
}
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