#include "pci.h"
+#ifdef CONFIG_PCI_MSI
+
static int pci_msi_enable = 1;
int pci_msi_ignore_mask;
pci_intx(dev, enable);
}
+static void pci_msi_set_enable(struct pci_dev *dev, int enable)
+{
+ u16 control;
+
+ pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
+ control &= ~PCI_MSI_FLAGS_ENABLE;
+ if (enable)
+ control |= PCI_MSI_FLAGS_ENABLE;
+ pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control);
+}
+
static void __pci_restore_msi_state(struct pci_dev *dev)
{
u16 control;
pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control);
}
+static void pci_msix_clear_and_set_ctrl(struct pci_dev *dev, u16 clear, u16 set)
+{
+ u16 ctrl;
+
+ pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &ctrl);
+ ctrl &= ~clear;
+ ctrl |= set;
+ pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, ctrl);
+}
+
static void __pci_restore_msix_state(struct pci_dev *dev)
{
struct msi_desc *entry;
struct msi_desc *entry;
for_each_pci_msi_entry(entry, dev) {
- if (!dev->no_64bit_msi || !entry->msg.address_hi)
- continue;
- pci_err(dev, "Device has broken 64-bit MSI but arch"
- " tried to assign one above 4G\n");
- return -EIO;
+ if (entry->msg.address_hi && dev->no_64bit_msi) {
+ pci_err(dev, "arch assigned 64-bit MSI address %#x%08x but device only supports 32 bits\n",
+ entry->msg.address_hi, entry->msg.address_lo);
+ return -EIO;
+ }
}
return 0;
}
}
#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
+#endif /* CONFIG_PCI_MSI */
+
+void pci_msi_init(struct pci_dev *dev)
+{
+ u16 ctrl;
+
+ /*
+ * Disable the MSI hardware to avoid screaming interrupts
+ * during boot. This is the power on reset default so
+ * usually this should be a noop.
+ */
+ dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI);
+ if (!dev->msi_cap)
+ return;
+
+ pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &ctrl);
+ if (ctrl & PCI_MSI_FLAGS_ENABLE)
+ pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS,
+ ctrl & ~PCI_MSI_FLAGS_ENABLE);
+
+ if (!(ctrl & PCI_MSI_FLAGS_64BIT))
+ dev->no_64bit_msi = 1;
+}
+
+void pci_msix_init(struct pci_dev *dev)
+{
+ u16 ctrl;
+
+ dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX);
+ if (!dev->msix_cap)
+ return;
+
+ pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &ctrl);
+ if (ctrl & PCI_MSIX_FLAGS_ENABLE)
+ pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS,
+ ctrl & ~PCI_MSIX_FLAGS_ENABLE);
+}