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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
[mirror_ubuntu-hirsute-kernel.git] / arch / powerpc / kernel / msi.c
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2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
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2/*
3 * Copyright 2006-2007, Michael Ellerman, IBM Corporation.
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4 */
5
6#include <linux/kernel.h>
7#include <linux/msi.h>
ceb93a9f 8#include <linux/pci.h>
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9
10#include <asm/machdep.h>
11
6b2fd7ef 12int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
df87ef55 13{
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14 struct pci_controller *phb = pci_bus_to_host(dev->bus);
15
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16 if (!phb->controller_ops.setup_msi_irqs ||
17 !phb->controller_ops.teardown_msi_irqs) {
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18 pr_debug("msi: Platform doesn't provide MSI callbacks.\n");
19 return -ENOSYS;
20 }
21
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22 /* PowerPC doesn't support multiple MSI yet */
23 if (type == PCI_CAP_ID_MSI && nvec > 1)
24 return 1;
25
1f88d586 26 return phb->controller_ops.setup_msi_irqs(dev, nvec, type);
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27}
28
29void arch_teardown_msi_irqs(struct pci_dev *dev)
30{
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31 struct pci_controller *phb = pci_bus_to_host(dev->bus);
32
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33 /*
34 * We can be called even when arch_setup_msi_irqs() returns -ENOSYS,
35 * so check the pointer again.
36 */
37 if (phb->controller_ops.teardown_msi_irqs)
38 phb->controller_ops.teardown_msi_irqs(dev);
df87ef55 39}