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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 <leon.h>
#define amba_insert_device(tab, address) \
{ \
if (*(address)) \
{ \
(tab)->addr[(tab)->devnr] = (address); \
(tab)->devnr ++; \
} \
} while(0)
/* 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;
/*
* bsp_leon3_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.
*/
void bsp_leon3_predriver_hook(void)
{
unsigned int *cfg_area; /* address to configuration area */
unsigned int mbar, iobar, conf;
int i, j;
amba_conf.ahbmst.devnr = 0; amba_conf.ahbslv.devnr = 0; amba_conf.apbslv.devnr = 0;
cfg_area = (unsigned int *) (LEON3_IO_AREA | LEON3_CONF_AREA);
for (i = 0; i < LEON3_AHB_MASTERS; i++)
{
amba_insert_device(&amba_conf.ahbmst, cfg_area);
cfg_area += LEON3_AHB_CONF_WORDS;
}
cfg_area = (unsigned int *) (LEON3_IO_AREA | LEON3_CONF_AREA | LEON3_AHB_SLAVE_CONF_AREA);
for (i = 0; i < LEON3_AHB_SLAVES; i++)
{
amba_insert_device(&amba_conf.ahbslv, cfg_area);
cfg_area += LEON3_AHB_CONF_WORDS;
}
for (i = 0; i < amba_conf.ahbslv.devnr; i ++)
{
conf = amba_get_confword(amba_conf.ahbslv, i, 0);
mbar = amba_ahb_get_membar(amba_conf.ahbslv, i, 0);
if ((amba_vendor(conf) == VENDOR_GAISLER) && (amba_device(conf) == GAISLER_APBMST))
{
amba_conf.apbmst = amba_membar_start(mbar);
cfg_area = (unsigned int *) (amba_conf.apbmst | LEON3_CONF_AREA);
for (j = amba_conf.apbslv.devnr; j < LEON3_APB_SLAVES; j++)
{
amba_insert_device(&amba_conf.apbslv, cfg_area);
cfg_area += LEON3_APB_CONF_WORDS;
}
}
}
/* Find LEON3 Interrupt controler */
i = 0;
while (i < amba_conf.apbslv.devnr)
{
conf = amba_get_confword(amba_conf.apbslv, i, 0);
if ((amba_vendor(conf) == VENDOR_GAISLER) && (amba_device(conf) == GAISLER_IRQMP))
{
iobar = amba_apb_get_membar(amba_conf.apbslv, i);
LEON3_IrqCtrl_Regs = (volatile LEON3_IrqCtrl_Regs_Map *) amba_iobar_start(amba_conf.apbmst, iobar);
break;
}
i++;
}
}
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