i2c: Document the different ways to instantiate i2c devices

[linux-2.6-omap-h63xx.git] / drivers / pci / msi.c

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 11a51f8ed3b3b96ffa72820f195c6a7afa4bfa40..baba2eb5367df54bcc947333beda7e56332f3785 100644 (file)
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -103,6 +103,14 @@ static void msix_set_enable(struct pci_dev *dev, int enable)
        }
 }
 
+static inline __attribute_const__ u32 msi_mask(unsigned x)
+{
+       /* Don't shift by >= width of type */
+       if (x >= 5)
+               return 0xffffffff;
+       return (1 << (1 << x)) - 1;
+}
+
 static void msix_flush_writes(struct irq_desc *desc)
 {
        struct msi_desc *entry;
@@ -398,21 +406,18 @@ static int msi_capability_init(struct pci_dev *dev)
        entry->msi_attrib.masked = 1;
        entry->msi_attrib.default_irq = dev->irq;       /* Save IOAPIC IRQ */
        entry->msi_attrib.pos = pos;
-       if (entry->msi_attrib.maskbit) {
-               entry->mask_base = (void __iomem *)(long)msi_mask_bits_reg(pos,
-                               entry->msi_attrib.is_64);
-       }
        entry->dev = dev;
        if (entry->msi_attrib.maskbit) {
-               unsigned int maskbits, temp;
+               unsigned int base, maskbits, temp;
+
+               base = msi_mask_bits_reg(pos, entry->msi_attrib.is_64);
+               entry->mask_base = (void __iomem *)(long)base;
+
                /* All MSIs are unmasked by default, Mask them all */
-               pci_read_config_dword(dev,
-                       msi_mask_bits_reg(pos, entry->msi_attrib.is_64),
-                       &maskbits);
-               temp = (1 << multi_msi_capable(control));
-               temp = ((temp - 1) & ~temp);
+               pci_read_config_dword(dev, base, &maskbits);
+               temp = msi_mask((control & PCI_MSI_FLAGS_QMASK) >> 1);
                maskbits |= temp;
-               pci_write_config_dword(dev, entry->msi_attrib.is_64, maskbits);
+               pci_write_config_dword(dev, base, maskbits);
                entry->msi_attrib.maskbits_mask = temp;
        }
        list_add_tail(&entry->list, &dev->msi_list);
@@ -776,28 +781,19 @@ void pci_no_msi(void)
        pci_msi_enable = 0;
 }
 
-void pci_msi_init_pci_dev(struct pci_dev *dev)
-{
-       INIT_LIST_HEAD(&dev->msi_list);
-}
-
-#ifdef CONFIG_ACPI
-#include <linux/acpi.h>
-#include <linux/pci-acpi.h>
-static void __devinit msi_acpi_init(void)
+/**
+ * pci_msi_enabled - is MSI enabled?
+ *
+ * Returns true if MSI has not been disabled by the command-line option
+ * pci=nomsi.
+ **/
+int pci_msi_enabled(void)
 {
-       if (acpi_pci_disabled)
-               return;
-       pci_osc_support_set(OSC_MSI_SUPPORT);
-       pcie_osc_support_set(OSC_MSI_SUPPORT);
+       return pci_msi_enable;
 }
-#else
-static inline void msi_acpi_init(void) { }
-#endif /* CONFIG_ACPI */
+EXPORT_SYMBOL(pci_msi_enabled);
 
-void __devinit msi_init(void)
+void pci_msi_init_pci_dev(struct pci_dev *dev)
 {
-       if (!pci_msi_enable)
-               return;
-       msi_acpi_init();
+       INIT_LIST_HEAD(&dev->msi_list);
 }