newlib/libgloss/sparc_leon/amba.c

153 lines
4.7 KiB
C

/*
* Copyright (c) 2011 Aeroflex Gaisler
*
* BSD license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <asm-leon/leon.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*#define DEBUG_CONFIG*/
/* 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 = 0;
volatile LEON3_GpTimer_Regs_Map *LEON3_GpTimer_Regs = 0;
unsigned long LEON3_GpTimer_Irq = 0;
unsigned long
amba_find_apbslv_addr (unsigned long vendor, unsigned long device,
unsigned long *irq)
{
unsigned int i, conf, iobar;
for (i = 0; i < amba_conf.apbslv.devnr; i++)
{
conf = amba_get_confword (amba_conf.apbslv, i, 0);
if ((amba_vendor (conf) == vendor) && (amba_device (conf) == device))
{
if (irq)
{
*irq = amba_irq (conf);
}
iobar = amba_apb_get_membar (amba_conf.apbslv, i);
return amba_iobar_start (amba_conf.apbslv.apbmst[i], iobar);
}
}
return 0;
}
#define amba_insert_device(tab, address) do { \
if (LEON3_BYPASS_LOAD_PA(address)) { \
(tab)->addr[(tab)->devnr] = (address); \
(tab)->devnr ++; \
} \
} while(0)
#define amba_insert_apb_device(tab, address, apbmst, idx) do { \
if (*(address)) { \
(tab)->addr[(tab)->devnr] = (address); \
(tab)->apbmst[(tab)->devnr] = (apbmst); \
(tab)->apbmstidx[(tab)->devnr] = (idx); \
(tab)->devnr ++; \
} \
} while(0)
/*
* 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.
*/
int amba_init_done = 0;
void
amba_init (void)
{
unsigned int *cfg_area; /* address to configuration area */
unsigned int mbar, conf, apbmst;
int i, j, idx = 0;
if (amba_init_done)
{
return;
}
amba_init_done = 1;
memset (&amba_conf, 0, sizeof (amba_conf));
/*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))
{
int k;
/*amba_conf.apbmst = */ apbmst = amba_membar_start (mbar);
cfg_area = (unsigned int *) (apbmst | LEON3_CONF_AREA);
for (j = amba_conf.apbslv.devnr, k = 0;
j < AMBA_MAXAPB_DEVS && k < AMBA_MAXAPB_DEVS_PERBUS; j++, k++)
{
amba_insert_apb_device (&amba_conf.apbslv, cfg_area, apbmst,
idx);
cfg_area += LEON3_APB_CONF_WORDS;
}
idx++;
}
}
/* Find LEON3 Interrupt controler */
LEON3_IrqCtrl_Regs = (volatile LEON3_IrqCtrl_Regs_Map *)
amba_find_apbslv_addr (VENDOR_GAISLER, GAISLER_IRQMP, 0);
LEON3_GpTimer_Regs = (volatile LEON3_GpTimer_Regs_Map *)
amba_find_apbslv_addr (VENDOR_GAISLER, GAISLER_GPTIMER,
&LEON3_GpTimer_Irq);
if (LEON3_IrqCtrl_Regs)
{
LEON3_BYPASS_STORE_PA (&(LEON3_IrqCtrl_Regs->mask[0]), 0);
}
}