| 1 | // SPDX-License-Identifier: GPL-2.0 |
|---|
| 2 | /* |
|---|
| 3 | * MSI[X} related functions which are available unconditionally. |
|---|
| 4 | */ |
|---|
| 5 | #include "../pci.h" |
|---|
| 6 | |
|---|
| 7 | /* |
|---|
| 8 | * Disable the MSI[X] hardware to avoid screaming interrupts during boot. |
|---|
| 9 | * This is the power on reset default so usually this should be a noop. |
|---|
| 10 | */ |
|---|
| 11 | |
|---|
| 12 | void pci_msi_init(struct pci_dev *dev) |
|---|
| 13 | { |
|---|
| 14 | u16 ctrl; |
|---|
| 15 | |
|---|
| 16 | dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI); |
|---|
| 17 | if (!dev->msi_cap) |
|---|
| 18 | return; |
|---|
| 19 | |
|---|
| 20 | pci_read_config_word(dev, where: dev->msi_cap + PCI_MSI_FLAGS, val: &ctrl); |
|---|
| 21 | if (ctrl & PCI_MSI_FLAGS_ENABLE) { |
|---|
| 22 | pci_write_config_word(dev, where: dev->msi_cap + PCI_MSI_FLAGS, |
|---|
| 23 | val: ctrl & ~PCI_MSI_FLAGS_ENABLE); |
|---|
| 24 | } |
|---|
| 25 | |
|---|
| 26 | if (!(ctrl & PCI_MSI_FLAGS_64BIT)) |
|---|
| 27 | dev->no_64bit_msi = 1; |
|---|
| 28 | } |
|---|
| 29 | |
|---|
| 30 | void pci_msix_init(struct pci_dev *dev) |
|---|
| 31 | { |
|---|
| 32 | u16 ctrl; |
|---|
| 33 | |
|---|
| 34 | dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX); |
|---|
| 35 | if (!dev->msix_cap) |
|---|
| 36 | return; |
|---|
| 37 | |
|---|
| 38 | pci_read_config_word(dev, where: dev->msix_cap + PCI_MSIX_FLAGS, val: &ctrl); |
|---|
| 39 | if (ctrl & PCI_MSIX_FLAGS_ENABLE) { |
|---|
| 40 | pci_write_config_word(dev, where: dev->msix_cap + PCI_MSIX_FLAGS, |
|---|
| 41 | val: ctrl & ~PCI_MSIX_FLAGS_ENABLE); |
|---|
| 42 | } |
|---|
| 43 | } |
|---|
| 44 | |
|---|
