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Diffstat (limited to 'arch/powerpc/platforms/ps3/smp.c')
-rw-r--r--arch/powerpc/platforms/ps3/smp.c158
1 files changed, 158 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/ps3/smp.c b/arch/powerpc/platforms/ps3/smp.c
new file mode 100644
index 00000000000..11d2080607e
--- /dev/null
+++ b/arch/powerpc/platforms/ps3/smp.c
@@ -0,0 +1,158 @@
+/*
+ * PS3 SMP routines.
+ *
+ * Copyright (C) 2006 Sony Computer Entertainment Inc.
+ * Copyright 2006 Sony Corp.
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/smp.h>
+
+#include <asm/machdep.h>
+#include <asm/udbg.h>
+#include <asm/ps3.h>
+
+#include "platform.h"
+
+#if defined(DEBUG)
+#define DBG(fmt...) udbg_printf(fmt)
+#else
+#define DBG(fmt...) do{if(0)printk(fmt);}while(0)
+#endif
+
+static irqreturn_t ipi_function_handler(int irq, void *msg)
+{
+ smp_message_recv((int)(long)msg);
+ return IRQ_HANDLED;
+}
+
+/**
+ * virqs - a per cpu array of virqs for ipi use
+ */
+
+#define MSG_COUNT 4
+static DEFINE_PER_CPU(unsigned int, virqs[MSG_COUNT]);
+
+static const char *names[MSG_COUNT] = {
+ "ipi call",
+ "ipi reschedule",
+ "ipi migrate",
+ "ipi debug brk"
+};
+
+static void do_message_pass(int target, int msg)
+{
+ int result;
+ unsigned int virq;
+
+ if (msg >= MSG_COUNT) {
+ DBG("%s:%d: bad msg: %d\n", __func__, __LINE__, msg);
+ return;
+ }
+
+ virq = per_cpu(virqs, target)[msg];
+ result = ps3_send_event_locally(virq);
+
+ if (result)
+ DBG("%s:%d: ps3_send_event_locally(%d, %d) failed"
+ " (%d)\n", __func__, __LINE__, target, msg, result);
+}
+
+static void ps3_smp_message_pass(int target, int msg)
+{
+ int cpu;
+
+ if (target < NR_CPUS)
+ do_message_pass(target, msg);
+ else if (target == MSG_ALL_BUT_SELF) {
+ for_each_online_cpu(cpu)
+ if (cpu != smp_processor_id())
+ do_message_pass(cpu, msg);
+ } else {
+ for_each_online_cpu(cpu)
+ do_message_pass(cpu, msg);
+ }
+}
+
+static int ps3_smp_probe(void)
+{
+ return 2;
+}
+
+static void __init ps3_smp_setup_cpu(int cpu)
+{
+ int result;
+ unsigned int *virqs = per_cpu(virqs, cpu);
+ int i;
+
+ DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
+
+ /*
+ * Check assumptions on virqs[] indexing. If this
+ * check fails, then a different mapping of PPC_MSG_
+ * to index needs to be setup.
+ */
+
+ BUILD_BUG_ON(PPC_MSG_CALL_FUNCTION != 0);
+ BUILD_BUG_ON(PPC_MSG_RESCHEDULE != 1);
+ BUILD_BUG_ON(PPC_MSG_DEBUGGER_BREAK != 3);
+
+ for (i = 0; i < MSG_COUNT; i++) {
+ result = ps3_alloc_event_irq(&virqs[i]);
+
+ if (result)
+ continue;
+
+ DBG("%s:%d: (%d, %d) => virq %u\n",
+ __func__, __LINE__, cpu, i, virqs[i]);
+
+
+ request_irq(virqs[i], ipi_function_handler, IRQF_DISABLED,
+ names[i], (void*)(long)i);
+ }
+
+ ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_DEBUGGER_BREAK]);
+
+ DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
+}
+
+void ps3_smp_cleanup_cpu(int cpu)
+{
+ unsigned int *virqs = per_cpu(virqs, cpu);
+ int i;
+
+ DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
+ for (i = 0; i < MSG_COUNT; i++) {
+ ps3_free_event_irq(virqs[i]);
+ free_irq(virqs[i], (void*)(long)i);
+ virqs[i] = NO_IRQ;
+ }
+ DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
+}
+
+static struct smp_ops_t ps3_smp_ops = {
+ .probe = ps3_smp_probe,
+ .message_pass = ps3_smp_message_pass,
+ .kick_cpu = smp_generic_kick_cpu,
+ .setup_cpu = ps3_smp_setup_cpu,
+};
+
+void smp_init_ps3(void)
+{
+ DBG(" -> %s\n", __func__);
+ smp_ops = &ps3_smp_ops;
+ DBG(" <- %s\n", __func__);
+}