From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001
From: root <root@artemis.panaceas.org>
Date: Fri, 25 Dec 2015 04:40:36 +0000
Subject: initial_commit

---
 arch/powerpc/sysdev/mpic_msi.c | 103 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 arch/powerpc/sysdev/mpic_msi.c

(limited to 'arch/powerpc/sysdev/mpic_msi.c')

diff --git a/arch/powerpc/sysdev/mpic_msi.c b/arch/powerpc/sysdev/mpic_msi.c
new file mode 100644
index 00000000..0f67cd79
--- /dev/null
+++ b/arch/powerpc/sysdev/mpic_msi.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2006-2007, Michael Ellerman, IBM 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; version 2 of the
+ * License.
+ *
+ */
+
+#include <linux/irq.h>
+#include <linux/bitmap.h>
+#include <linux/msi.h>
+#include <asm/mpic.h>
+#include <asm/prom.h>
+#include <asm/hw_irq.h>
+#include <asm/ppc-pci.h>
+#include <asm/msi_bitmap.h>
+
+#include <sysdev/mpic.h>
+
+void mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq)
+{
+	/* The mpic calls this even when there is no allocator setup */
+	if (!mpic->msi_bitmap.bitmap)
+		return;
+
+	msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq);
+}
+
+#ifdef CONFIG_MPIC_U3_HT_IRQS
+static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic)
+{
+	irq_hw_number_t hwirq;
+	struct irq_host_ops *ops = mpic->irqhost->ops;
+	struct device_node *np;
+	int flags, index, i;
+	struct of_irq oirq;
+
+	pr_debug("mpic: found U3, guessing msi allocator setup\n");
+
+	/* Reserve source numbers we know are reserved in the HW.
+	 *
+	 * This is a bit of a mix of U3 and U4 reserves but that's going
+	 * to work fine, we have plenty enugh numbers left so let's just
+	 * mark anything we don't like reserved.
+	 */
+	for (i = 0;   i < 8;   i++)
+		msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
+
+	for (i = 42;  i < 46;  i++)
+		msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
+
+	for (i = 100; i < 105; i++)
+		msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
+
+	for (i = 124; i < mpic->irq_count; i++)
+		msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
+
+
+	np = NULL;
+	while ((np = of_find_all_nodes(np))) {
+		pr_debug("mpic: mapping hwirqs for %s\n", np->full_name);
+
+		index = 0;
+		while (of_irq_map_one(np, index++, &oirq) == 0) {
+			ops->xlate(mpic->irqhost, NULL, oirq.specifier,
+						oirq.size, &hwirq, &flags);
+			msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq);
+		}
+	}
+
+	return 0;
+}
+#else
+static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic)
+{
+	return -1;
+}
+#endif
+
+int mpic_msi_init_allocator(struct mpic *mpic)
+{
+	int rc;
+
+	rc = msi_bitmap_alloc(&mpic->msi_bitmap, mpic->irq_count,
+			      mpic->irqhost->of_node);
+	if (rc)
+		return rc;
+
+	rc = msi_bitmap_reserve_dt_hwirqs(&mpic->msi_bitmap);
+	if (rc > 0) {
+		if (mpic->flags & MPIC_U3_HT_IRQS)
+			rc = mpic_msi_reserve_u3_hwirqs(mpic);
+
+		if (rc) {
+			msi_bitmap_free(&mpic->msi_bitmap);
+			return rc;
+		}
+	}
+
+	return 0;
+}
-- 
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