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/*
* AMBA Plag & Play Bus Driver
*
* This driver hook performs bus scanning.
*
* COPYRIGHT (c) 2004.
* Gaisler Research
*
* 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.
*
* $Id$
*/
#include <bsp.h>
/* Structure containing address to devices found on the Amba Plug&Play bus */
amba_confarea_type amba_conf;
/* Pointers to Interrupt Controller configuration registers */
volatile LEON3_IrqCtrl_Regs_Map *LEON3_IrqCtrl_Regs;
int LEON3_Cpu_Index = 0;
/*
* bsp_predriver_hook
*
* BSP predriver hook. Called just before drivers are initialized.
* Used to scan system bus. Probes for AHB masters, AHB slaves and
* APB slaves. Addresses to configuration areas of the AHB masters,
* AHB slaves, APB slaves and APB master are storeds in
* amba_ahb_masters, amba_ahb_slaves and amba.
*/
unsigned int getasr17(void);
asm(" .text \n"
"getasr17: \n"
"retl \n"
"mov %asr17, %o0\n"
);
extern rtems_configuration_table Configuration;
void bsp_predriver_hook(void)
{
int i;
amba_apb_device dev;
/* Scan the AMBA Plug&Play info at the default LEON3 area */
amba_scan(&amba_conf,LEON3_IO_AREA,NULL);
/* Find LEON3 Interrupt controler */
i = amba_find_apbslv(&amba_conf,VENDOR_GAISLER,GAISLER_IRQMP,&dev);
if ( i > 0 ){
/* Found APB IRQ_MP Interrupt Controller */
LEON3_IrqCtrl_Regs = (volatile LEON3_IrqCtrl_Regs_Map *) dev.start;
#if defined(RTEMS_MULTIPROCESSING)
if (rtems_configuration_get_user_multiprocessing_table() != NULL) {
unsigned int tmp = getasr17();
LEON3_Cpu_Index = (tmp >> 28) & 3;
}
#endif
}
/* find GP Timer */
i = amba_find_apbslv(&amba_conf,VENDOR_GAISLER,GAISLER_GPTIMER,&dev);
if ( i > 0 ){
LEON3_Timer_Regs = (volatile LEON3_Timer_Regs_Map *) dev.start;
}
}
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