1 // SPDX-License-Identifier: GPL-2.0-only 1
2 /*
3 * Copyright 2006-2007, Michael Ellerman, IBM
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,
19 {
20 /* The mpic calls this even when there
21 if (!mpic->msi_bitmap.bitmap)
22 return;
23
24 msi_bitmap_reserve_hwirq(&mpic->msi_bi
25 }
26
27 #ifdef CONFIG_MPIC_U3_HT_IRQS
28 static int __init mpic_msi_reserve_u3_hwirqs(s
29 {
30 irq_hw_number_t hwirq;
31 const struct irq_domain_ops *ops = mpi
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
37
38 /* Reserve source numbers we know are
39 *
40 * This is a bit of a mix of U3 and U4
41 * to work fine, we have plenty enough
42 * mark anything we don't like reserve
43 */
44 for (i = 0; i < 8; i++)
45 msi_bitmap_reserve_hwirq(&mpic
46
47 for (i = 42; i < 46; i++)
48 msi_bitmap_reserve_hwirq(&mpic
49
50 for (i = 100; i < 105; i++)
51 msi_bitmap_reserve_hwirq(&mpic
52
53 for (i = 124; i < mpic->num_sources; i
54 msi_bitmap_reserve_hwirq(&mpic
55
56
57 np = NULL;
58 while ((np = of_find_all_nodes(np))) {
59 pr_debug("mpic: mapping hwirqs
60
61 index = 0;
62 while (of_irq_parse_one(np, in
63 ops->xlate(mpic->irqho
64
65 msi_bitmap_reserve_hwi
66 }
67 }
68
69 return 0;
70 }
71 #else
72 static int __init mpic_msi_reserve_u3_hwirqs(s
73 {
74 return -1;
75 }
76 #endif
77
78 int __init mpic_msi_init_allocator(struct mpic
79 {
80 int rc;
81
82 rc = msi_bitmap_alloc(&mpic->msi_bitma
83 irq_domain_get_o
84 if (rc)
85 return rc;
86
87 rc = msi_bitmap_reserve_dt_hwirqs(&mpi
88 if (rc > 0) {
89 if (mpic->flags & MPIC_U3_HT_I
90 rc = mpic_msi_reserve_
91
92 if (rc) {
93 msi_bitmap_free(&mpic-
94 return rc;
95 }
96 }
97
98 return 0;
99 }
100
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.