99 lines
2.7 KiB
C
99 lines
2.7 KiB
C
/*
|
|
* Copyright (C) 2001, 2002, 2003 Broadcom Corporation
|
|
*
|
|
* 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; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* 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, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/kernel_stat.h>
|
|
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/io.h>
|
|
#include <asm/sibyte/sb1250.h>
|
|
#include <asm/sibyte/sb1250_regs.h>
|
|
#include <asm/sibyte/sb1250_int.h>
|
|
|
|
static void *mailbox_set_regs[] = {
|
|
IOADDR(A_IMR_CPU0_BASE + R_IMR_MAILBOX_SET_CPU),
|
|
IOADDR(A_IMR_CPU1_BASE + R_IMR_MAILBOX_SET_CPU)
|
|
};
|
|
|
|
static void *mailbox_clear_regs[] = {
|
|
IOADDR(A_IMR_CPU0_BASE + R_IMR_MAILBOX_CLR_CPU),
|
|
IOADDR(A_IMR_CPU1_BASE + R_IMR_MAILBOX_CLR_CPU)
|
|
};
|
|
|
|
static void *mailbox_regs[] = {
|
|
IOADDR(A_IMR_CPU0_BASE + R_IMR_MAILBOX_CPU),
|
|
IOADDR(A_IMR_CPU1_BASE + R_IMR_MAILBOX_CPU)
|
|
};
|
|
|
|
/*
|
|
* SMP init and finish on secondary CPUs
|
|
*/
|
|
void sb1250_smp_init(void)
|
|
{
|
|
unsigned int imask = STATUSF_IP4 | STATUSF_IP3 | STATUSF_IP2 |
|
|
STATUSF_IP1 | STATUSF_IP0;
|
|
|
|
/* Set interrupt mask, but don't enable */
|
|
change_c0_status(ST0_IM, imask);
|
|
}
|
|
|
|
void sb1250_smp_finish(void)
|
|
{
|
|
extern void sb1250_time_init(void);
|
|
sb1250_time_init();
|
|
local_irq_enable();
|
|
}
|
|
|
|
/*
|
|
* These are routines for dealing with the sb1250 smp capabilities
|
|
* independent of board/firmware
|
|
*/
|
|
|
|
/*
|
|
* Simple enough; everything is set up, so just poke the appropriate mailbox
|
|
* register, and we should be set
|
|
*/
|
|
void core_send_ipi(int cpu, unsigned int action)
|
|
{
|
|
__raw_writeq((((u64)action) << 48), mailbox_set_regs[cpu]);
|
|
}
|
|
|
|
void sb1250_mailbox_interrupt(void)
|
|
{
|
|
int cpu = smp_processor_id();
|
|
unsigned int action;
|
|
|
|
kstat_this_cpu.irqs[K_INT_MBOX_0]++;
|
|
/* Load the mailbox register to figure out what we're supposed to do */
|
|
action = (____raw_readq(mailbox_regs[cpu]) >> 48) & 0xffff;
|
|
|
|
/* Clear the mailbox to clear the interrupt */
|
|
____raw_writeq(((u64)action) << 48, mailbox_clear_regs[cpu]);
|
|
|
|
/*
|
|
* Nothing to do for SMP_RESCHEDULE_YOURSELF; returning from the
|
|
* interrupt will do the reschedule for us
|
|
*/
|
|
|
|
if (action & SMP_CALL_FUNCTION)
|
|
smp_call_function_interrupt();
|
|
}
|