2 * Copyright 2006-2007, Michael Ellerman, IBM Corporation.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; version 2 of the
11 #include <linux/irq.h>
12 #include <linux/bitmap.h>
13 #include <linux/msi.h>
16 #include <asm/hw_irq.h>
17 #include <asm/ppc-pci.h>
18 #include <asm/msi_bitmap.h>
20 #include <sysdev/mpic.h>
22 void mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq)
24 /* The mpic calls this even when there is no allocator setup */
25 if (!mpic->msi_bitmap.bitmap)
28 msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq);
31 #ifdef CONFIG_MPIC_U3_HT_IRQS
32 static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic)
34 irq_hw_number_t hwirq;
35 const struct irq_domain_ops *ops = mpic->irqhost->ops;
36 struct device_node *np;
40 pr_debug("mpic: found U3, guessing msi allocator setup\n");
42 /* Reserve source numbers we know are reserved in the HW.
44 * This is a bit of a mix of U3 and U4 reserves but that's going
45 * to work fine, we have plenty enugh numbers left so let's just
46 * mark anything we don't like reserved.
48 for (i = 0; i < 8; i++)
49 msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
51 for (i = 42; i < 46; i++)
52 msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
54 for (i = 100; i < 105; i++)
55 msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
57 for (i = 124; i < mpic->irq_count; i++)
58 msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
62 while ((np = of_find_all_nodes(np))) {
63 pr_debug("mpic: mapping hwirqs for %s\n", np->full_name);
66 while (of_irq_map_one(np, index++, &oirq) == 0) {
67 ops->xlate(mpic->irqhost, NULL, oirq.specifier,
68 oirq.size, &hwirq, &flags);
69 msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq);
76 static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic)
82 int mpic_msi_init_allocator(struct mpic *mpic)
86 rc = msi_bitmap_alloc(&mpic->msi_bitmap, mpic->irq_count,
87 mpic->irqhost->of_node);
91 rc = msi_bitmap_reserve_dt_hwirqs(&mpic->msi_bitmap);
93 if (mpic->flags & MPIC_U3_HT_IRQS)
94 rc = mpic_msi_reserve_u3_hwirqs(mpic);
97 msi_bitmap_free(&mpic->msi_bitmap);