1 files changed, 98 insertions, 0 deletions

diff --git a/arch/mips/sibyte/sb1250/smp.c b/arch/mips/sibyte/sb1250/smp.c
new file mode 100644
index 000000000000..be91b3990952
--- /dev/null
+++ b/arch/mips/sibyte/sb1250/smp.c
@@ -0,0 +1,98 @@
+/*
+ * 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[] = {
+        (void *)IOADDR(A_IMR_CPU0_BASE + R_IMR_MAILBOX_SET_CPU),
+        (void *)IOADDR(A_IMR_CPU1_BASE + R_IMR_MAILBOX_SET_CPU)
+};
+
+static void *mailbox_clear_regs[] = {
+        (void *)IOADDR(A_IMR_CPU0_BASE + R_IMR_MAILBOX_CLR_CPU),
+        (void *)IOADDR(A_IMR_CPU1_BASE + R_IMR_MAILBOX_CLR_CPU)
+};
+
+static void *mailbox_regs[] = {
+        (void *)IOADDR(A_IMR_CPU0_BASE + R_IMR_MAILBOX_CPU),
+        (void *)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)
+{
+        bus_writeq((((u64)action) << 48), mailbox_set_regs[cpu]);
+}
+
+void sb1250_mailbox_interrupt(struct pt_regs *regs)
+{
+        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 = (__bus_readq(mailbox_regs[cpu]) >> 48) & 0xffff;
+
+        /* Clear the mailbox to clear the interrupt */
+        __bus_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();
+}