/*-------------------------------------------------------------------------+
| This file contains the ARM BSP startup package. It includes application,
| board, and monitor specific initialization and configuration. The generic CPU
| dependent initialization has been performed before this routine is invoked.
+--------------------------------------------------------------------------+
|
| Copyright (c) 2000 Canon Research Centre France SA.
| Emmanuel Raguet, mailto:raguet@crf.canon.fr
|
| The license and distribution terms for this file may be
| found in found in the file LICENSE in this distribution or at
| http://www.rtems.com/license/LICENSE.
|
+--------------------------------------------------------------------------*/
#include <bsp.h>
#include <rtems/libcsupport.h>
#include <rtems/libio.h>
#include <rtems/bspIo.h>
#include <s3c24xx.h>
/*-------------------------------------------------------------------------+
| Global Variables
+--------------------------------------------------------------------------*/
extern void *_sdram_size;
extern void *_sdram_base;
extern void *_bss_free_start;
unsigned long free_mem_start;
unsigned long free_mem_end;
/*-------------------------------------------------------------------------+
| External Prototypes
+--------------------------------------------------------------------------*/
extern void rtems_irq_mngt_init(void);
void bsp_libc_init( void *, uint32_t, int );
void bsp_postdriver_hook(void);
/*-------------------------------------------------------------------------+
| Function: bsp_pretasking_hook
| Description: BSP pretasking hook. Called just before drivers are
| initialized. Used to setup libc and install any BSP
| extensions. NOTE: Must not use libc (to do io) from here,
| since drivers are not yet initialized.
| Global Variables: None.
| Arguments: None.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
void bsp_pretasking_hook(void)
{
uint32_t heap_start;
uint32_t heap_size;
/*
* Set up the heap.
*/
heap_start = free_mem_start;
heap_size = free_mem_end - free_mem_start;
/* call rtems lib init - malloc stuff */
bsp_libc_init((void *)heap_start, heap_size, 0);
#ifdef RTEMS_DEBUG
rtems_debug_enable(RTEMS_DEBUG_ALL_MASK);
#endif /* RTEMS_DEBUG */
} /* bsp_pretasking_hook */
Thread bsp_idle_task(uint32_t ignored)
{
while(1) {
asm volatile ("MCR p15,0,r0,c7,c0,4 \n");
}
}
/*-------------------------------------------------------------------------+
| Function: bsp_start
| Description: Called before main is invoked.
| Global Variables: None.
| Arguments: None.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
void bsp_start_default( void )
{
uint32_t cr;
uint32_t pend,last;
uint32_t REFCNT;
int i;
/* stop RTC */
#ifdef CPU_S3C2400
rTICINT=0x0;
#else
rTICNT=0x0;
#endif
/* stop watchdog,ADC and timers */
rWTCON=0x0;
rTCON=0x0;
rADCCON=0x0;
/* disable interrupts */
rINTMOD=0x0;
rINTMSK=BIT_ALLMSK; /* unmasked by drivers */
last=0;
for(i=0; i<4; i++) {
pend=rSRCPND;
if(pend == 0 || pend == last)
break;
rSRCPND=pend;
rINTPND=pend;
last=pend;
}
/* setup clocks */
rCLKDIVN=M_CLKDIVN;
rMPLLCON=((M_MDIV<<12)+(M_PDIV<<4)+M_SDIV);
/* setup rREFRESH */
REFCNT=2048+1-(15.6*get_HCLK()/1000000); /* period=15.6 us, HCLK=66Mhz, (2048+1-15.6*66) */
rREFRESH=((REFEN<<23)+(TREFMD<<22)+(Trp<<20)+(Trc<<18)+(Tchr<<16)+REFCNT);
/* set prescaler for timers 2,3,4 to 16(15+1) */
cr=rTCFG0 & 0xFFFF00FF;
rTCFG0=(cr | (15<<8));
/* set prescaler for timers 0,1 to 1(0+1) */
cr=rTCFG0 & 0xFFFFFF00;
rTCFG0=(cr | (0<<0));
/* Place RTEMS workspace at beginning of free memory. */
Configuration.work_space_start = (void *)&_bss_free_start;
free_mem_start = ((uint32_t)&_bss_free_start + rtems_configuration_get_work_space_size());
free_mem_end = ((uint32_t)&_sdram_base + (uint32_t)&_sdram_size);
/*
* Init rtems exceptions management
*/
rtems_exception_init_mngt();
/*
* Init rtems interrupt management
*/
rtems_irq_mngt_init();
/*
* The following information is very useful when debugging.
*/
#if 0
printk( "work_space_size = 0x%x\n",
rtems_configuration_get_work_space_size() );
printk( "microseconds_per_tick = 0x%x\n",
rtems_configuration_get_microseconds_per_tick() );
printk( "ticks_per_timeslice = 0x%x\n",
rtems_configuration_get_ticks_per_timeslice() );
printk( "_heap_size = 0x%x\n", _heap_size );
/* printk( "_stack_size = 0x%x\n", _stack_size );*/
printk( "rtemsFreeMemStart = 0x%x\n", rtemsFreeMemStart );
printk( "work_space_start = 0x%x\n", Configuration.work_space_start );
printk( "work_space_size = 0x%x\n", rtems_configuration_get_work_space_size() );
#endif
}
/*
* By making this a weak alias for bsp_start_default, a brave soul
* can override the actual bsp_start routine used.
*/
void bsp_start (void) __attribute__ ((weak, alias("bsp_start_default")));
void bsp_reset(void)
{
rtems_interrupt_level level;
rtems_interrupt_disable(level);
printk("bsp_reset.....\n");
/* disable mmu, invalide i-cache and call swi #4 */
asm volatile(""
"mrc p15,0,r0,c1,c0,0 \n"
"bic r0,r0,#1 \n"
"mcr p15,0,r0,c1,c0,0 \n"
"nop \n"
"nop \n"
"nop \n"
"nop \n"
"nop \n"
"mov r0,#0 \n"
"MCR p15,0,r0,c7,c5,0 \n"
"nop \n"
"nop \n"
"nop \n"
"nop \n"
"nop \n"
"swi #4 "
:
:
: "r0"
);
/* we should be back in bios now */
}
