44 lines
1.0 KiB
C
44 lines
1.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* MSI[X} related functions which are available unconditionally.
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*/
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#include "../pci.h"
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/*
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* Disable the MSI[X] hardware to avoid screaming interrupts during boot.
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* This is the power on reset default so usually this should be a noop.
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*/
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void pci_msi_init(struct pci_dev *dev)
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{
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u16 ctrl;
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dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI);
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if (!dev->msi_cap)
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return;
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pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &ctrl);
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if (ctrl & PCI_MSI_FLAGS_ENABLE) {
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pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS,
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ctrl & ~PCI_MSI_FLAGS_ENABLE);
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}
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if (!(ctrl & PCI_MSI_FLAGS_64BIT))
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dev->no_64bit_msi = 1;
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}
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void pci_msix_init(struct pci_dev *dev)
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{
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u16 ctrl;
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dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX);
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if (!dev->msix_cap)
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return;
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pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &ctrl);
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if (ctrl & PCI_MSIX_FLAGS_ENABLE) {
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pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS,
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ctrl & ~PCI_MSIX_FLAGS_ENABLE);
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}
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}
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