1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright 2006-2007, Michael Ellerman, IBM Corporation. |
4 | */ |
5 | |
6 | #include <linux/irq.h> |
7 | #include <linux/irqdomain.h> |
8 | #include <linux/of_irq.h> |
9 | #include <linux/bitmap.h> |
10 | #include <linux/msi.h> |
11 | #include <asm/mpic.h> |
12 | #include <asm/hw_irq.h> |
13 | #include <asm/ppc-pci.h> |
14 | #include <asm/msi_bitmap.h> |
15 | |
16 | #include <sysdev/mpic.h> |
17 | |
18 | void mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq) |
19 | { |
20 | /* The mpic calls this even when there is no allocator setup */ |
21 | if (!mpic->msi_bitmap.bitmap) |
22 | return; |
23 | |
24 | msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq); |
25 | } |
26 | |
27 | #ifdef CONFIG_MPIC_U3_HT_IRQS |
28 | static int __init mpic_msi_reserve_u3_hwirqs(struct mpic *mpic) |
29 | { |
30 | irq_hw_number_t hwirq; |
31 | const struct irq_domain_ops *ops = mpic->irqhost->ops; |
32 | struct device_node *np; |
33 | int flags, index, i; |
34 | struct of_phandle_args oirq; |
35 | |
36 | pr_debug("mpic: found U3, guessing msi allocator setup\n" ); |
37 | |
38 | /* Reserve source numbers we know are reserved in the HW. |
39 | * |
40 | * This is a bit of a mix of U3 and U4 reserves but that's going |
41 | * to work fine, we have plenty enough numbers left so let's just |
42 | * mark anything we don't like reserved. |
43 | */ |
44 | for (i = 0; i < 8; i++) |
45 | msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i); |
46 | |
47 | for (i = 42; i < 46; i++) |
48 | msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i); |
49 | |
50 | for (i = 100; i < 105; i++) |
51 | msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i); |
52 | |
53 | for (i = 124; i < mpic->num_sources; i++) |
54 | msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i); |
55 | |
56 | |
57 | np = NULL; |
58 | while ((np = of_find_all_nodes(np))) { |
59 | pr_debug("mpic: mapping hwirqs for %pOF\n" , np); |
60 | |
61 | index = 0; |
62 | while (of_irq_parse_one(np, index++, &oirq) == 0) { |
63 | ops->xlate(mpic->irqhost, NULL, oirq.args, |
64 | oirq.args_count, &hwirq, &flags); |
65 | msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq); |
66 | } |
67 | } |
68 | |
69 | return 0; |
70 | } |
71 | #else |
72 | static int __init mpic_msi_reserve_u3_hwirqs(struct mpic *mpic) |
73 | { |
74 | return -1; |
75 | } |
76 | #endif |
77 | |
78 | int __init mpic_msi_init_allocator(struct mpic *mpic) |
79 | { |
80 | int rc; |
81 | |
82 | rc = msi_bitmap_alloc(&mpic->msi_bitmap, mpic->num_sources, |
83 | irq_domain_get_of_node(d: mpic->irqhost)); |
84 | if (rc) |
85 | return rc; |
86 | |
87 | rc = msi_bitmap_reserve_dt_hwirqs(&mpic->msi_bitmap); |
88 | if (rc > 0) { |
89 | if (mpic->flags & MPIC_U3_HT_IRQS) |
90 | rc = mpic_msi_reserve_u3_hwirqs(mpic); |
91 | |
92 | if (rc) { |
93 | msi_bitmap_free(&mpic->msi_bitmap); |
94 | return rc; |
95 | } |
96 | } |
97 | |
98 | return 0; |
99 | } |
100 | |