litex/software/libbase/system.c

83 lines
2.0 KiB
C

/*
* Milkymist SoC (Software)
* Copyright (C) 2007, 2008, 2009, 2012 Sebastien Bourdeauducq
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <irq.h>
#include <uart.h>
#include <hw/sysctl.h>
#include <system.h>
void flush_cpu_icache(void)
{
asm volatile(
"wcsr ICC, r0\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
);
}
void flush_cpu_dcache(void)
{
asm volatile(
"wcsr DCC, r0\n"
"nop\n"
);
}
__attribute__((noreturn)) void reboot(void)
{
uart_sync();
irq_setmask(0);
irq_setie(0);
CSR_SYSTEM_ID = 1; /* Writing to CSR_SYSTEM_ID causes a system reset */
while(1);
}
static void icap_write(int val, unsigned int w)
{
while(!(CSR_ICAP & ICAP_READY));
if(!val)
w |= ICAP_CE|ICAP_WRITE;
CSR_ICAP = w;
}
__attribute__((noreturn)) void reconf(void)
{
uart_sync();
irq_setmask(0);
irq_setie(0);
icap_write(0, 0xffff); /* dummy word */
icap_write(0, 0xffff); /* dummy word */
icap_write(0, 0xffff); /* dummy word */
icap_write(0, 0xffff); /* dummy word */
icap_write(1, 0xaa99); /* sync word part 1 */
icap_write(1, 0x5566); /* sync word part 2 */
icap_write(1, 0x30a1); /* write to command register */
icap_write(1, 0x0000); /* null command */
icap_write(1, 0x30a1); /* write to command register */
icap_write(1, 0x000e); /* reboot command */
icap_write(1, 0x2000); /* NOP */
icap_write(1, 0x2000); /* NOP */
icap_write(1, 0x2000); /* NOP */
icap_write(1, 0x2000); /* NOP */
icap_write(0, 0x1111); /* NULL */
icap_write(0, 0xffff); /* dummy word */
while(1);
}