162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 262306a36Sopenharmony_ci/* 362306a36Sopenharmony_ci * MSI[X} related functions which are available unconditionally. 462306a36Sopenharmony_ci */ 562306a36Sopenharmony_ci#include "../pci.h" 662306a36Sopenharmony_ci 762306a36Sopenharmony_ci/* 862306a36Sopenharmony_ci * Disable the MSI[X] hardware to avoid screaming interrupts during boot. 962306a36Sopenharmony_ci * This is the power on reset default so usually this should be a noop. 1062306a36Sopenharmony_ci */ 1162306a36Sopenharmony_ci 1262306a36Sopenharmony_civoid pci_msi_init(struct pci_dev *dev) 1362306a36Sopenharmony_ci{ 1462306a36Sopenharmony_ci u16 ctrl; 1562306a36Sopenharmony_ci 1662306a36Sopenharmony_ci dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI); 1762306a36Sopenharmony_ci if (!dev->msi_cap) 1862306a36Sopenharmony_ci return; 1962306a36Sopenharmony_ci 2062306a36Sopenharmony_ci pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &ctrl); 2162306a36Sopenharmony_ci if (ctrl & PCI_MSI_FLAGS_ENABLE) { 2262306a36Sopenharmony_ci pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, 2362306a36Sopenharmony_ci ctrl & ~PCI_MSI_FLAGS_ENABLE); 2462306a36Sopenharmony_ci } 2562306a36Sopenharmony_ci 2662306a36Sopenharmony_ci if (!(ctrl & PCI_MSI_FLAGS_64BIT)) 2762306a36Sopenharmony_ci dev->no_64bit_msi = 1; 2862306a36Sopenharmony_ci} 2962306a36Sopenharmony_ci 3062306a36Sopenharmony_civoid pci_msix_init(struct pci_dev *dev) 3162306a36Sopenharmony_ci{ 3262306a36Sopenharmony_ci u16 ctrl; 3362306a36Sopenharmony_ci 3462306a36Sopenharmony_ci dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX); 3562306a36Sopenharmony_ci if (!dev->msix_cap) 3662306a36Sopenharmony_ci return; 3762306a36Sopenharmony_ci 3862306a36Sopenharmony_ci pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &ctrl); 3962306a36Sopenharmony_ci if (ctrl & PCI_MSIX_FLAGS_ENABLE) { 4062306a36Sopenharmony_ci pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, 4162306a36Sopenharmony_ci ctrl & ~PCI_MSIX_FLAGS_ENABLE); 4262306a36Sopenharmony_ci } 4362306a36Sopenharmony_ci} 44