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a7de7c74 ME |
1 | /* |
2 | * Copyright 2006-2007, Michael Ellerman, IBM Corporation. | |
3 | * | |
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 | |
7 | * License. | |
8 | * | |
9 | */ | |
10 | ||
11 | #include <linux/irq.h> | |
a7de7c74 ME |
12 | #include <linux/bitmap.h> |
13 | #include <linux/msi.h> | |
14 | #include <asm/mpic.h> | |
15 | #include <asm/prom.h> | |
16 | #include <asm/hw_irq.h> | |
17 | #include <asm/ppc-pci.h> | |
25235f71 | 18 | #include <asm/msi_bitmap.h> |
a7de7c74 | 19 | |
8fa29d22 | 20 | #include <sysdev/mpic.h> |
a7de7c74 | 21 | |
a7de7c74 ME |
22 | void mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq) |
23 | { | |
a7de7c74 | 24 | /* The mpic calls this even when there is no allocator setup */ |
25235f71 | 25 | if (!mpic->msi_bitmap.bitmap) |
a7de7c74 ME |
26 | return; |
27 | ||
25235f71 | 28 | msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq); |
a7de7c74 ME |
29 | } |
30 | ||
31 | #ifdef CONFIG_MPIC_U3_HT_IRQS | |
32 | static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic) | |
33 | { | |
34 | irq_hw_number_t hwirq; | |
a18dc81b | 35 | const struct irq_domain_ops *ops = mpic->irqhost->ops; |
a7de7c74 ME |
36 | struct device_node *np; |
37 | int flags, index, i; | |
530210c7 | 38 | struct of_phandle_args oirq; |
a7de7c74 ME |
39 | |
40 | pr_debug("mpic: found U3, guessing msi allocator setup\n"); | |
41 | ||
7a96c6b2 BH |
42 | /* Reserve source numbers we know are reserved in the HW. |
43 | * | |
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. | |
47 | */ | |
a7de7c74 | 48 | for (i = 0; i < 8; i++) |
25235f71 | 49 | msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i); |
a7de7c74 ME |
50 | |
51 | for (i = 42; i < 46; i++) | |
25235f71 | 52 | msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i); |
a7de7c74 ME |
53 | |
54 | for (i = 100; i < 105; i++) | |
25235f71 | 55 | msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i); |
a7de7c74 | 56 | |
5019609f | 57 | for (i = 124; i < mpic->num_sources; i++) |
7a96c6b2 BH |
58 | msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i); |
59 | ||
60 | ||
a7de7c74 ME |
61 | np = NULL; |
62 | while ((np = of_find_all_nodes(np))) { | |
63 | pr_debug("mpic: mapping hwirqs for %s\n", np->full_name); | |
64 | ||
65 | index = 0; | |
0c02c800 | 66 | while (of_irq_parse_one(np, index++, &oirq) == 0) { |
530210c7 GL |
67 | ops->xlate(mpic->irqhost, NULL, oirq.args, |
68 | oirq.args_count, &hwirq, &flags); | |
25235f71 | 69 | msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq); |
a7de7c74 ME |
70 | } |
71 | } | |
72 | ||
73 | return 0; | |
74 | } | |
75 | #else | |
76 | static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic) | |
77 | { | |
78 | return -1; | |
79 | } | |
80 | #endif | |
81 | ||
a7de7c74 ME |
82 | int mpic_msi_init_allocator(struct mpic *mpic) |
83 | { | |
25235f71 | 84 | int rc; |
a7de7c74 | 85 | |
5019609f | 86 | rc = msi_bitmap_alloc(&mpic->msi_bitmap, mpic->num_sources, |
25235f71 ME |
87 | mpic->irqhost->of_node); |
88 | if (rc) | |
89 | return rc; | |
a7de7c74 | 90 | |
25235f71 ME |
91 | rc = msi_bitmap_reserve_dt_hwirqs(&mpic->msi_bitmap); |
92 | if (rc > 0) { | |
a7de7c74 ME |
93 | if (mpic->flags & MPIC_U3_HT_IRQS) |
94 | rc = mpic_msi_reserve_u3_hwirqs(mpic); | |
95 | ||
25235f71 ME |
96 | if (rc) { |
97 | msi_bitmap_free(&mpic->msi_bitmap); | |
98 | return rc; | |
99 | } | |
a7de7c74 ME |
100 | } |
101 | ||
102 | return 0; | |
a7de7c74 | 103 | } |