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 74801f7df9c901ad21017ce2a831e0cd61c8af1c..baba2eb5367df54bcc947333beda7e56332f3785 100644 (file)
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -103,11 +103,19 @@ static void msix_set_enable(struct pci_dev *dev, int enable)
        }
 }
 
-static void msix_flush_writes(unsigned int irq)
+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;
 
-       entry = get_irq_msi(irq);
+       entry = get_irq_desc_msi(desc);
        BUG_ON(!entry || !entry->dev);
        switch (entry->msi_attrib.type) {
        case PCI_CAP_ID_MSI:
@@ -135,11 +143,11 @@ static void msix_flush_writes(unsigned int irq)
  * Returns 1 if it succeeded in masking the interrupt and 0 if the device
  * doesn't support MSI masking.
  */
-static int msi_set_mask_bits(unsigned int irq, u32 mask, u32 flag)
+static int msi_set_mask_bits(struct irq_desc *desc, u32 mask, u32 flag)
 {
        struct msi_desc *entry;
 
-       entry = get_irq_msi(irq);
+       entry = get_irq_desc_msi(desc);
        BUG_ON(!entry || !entry->dev);
        switch (entry->msi_attrib.type) {
        case PCI_CAP_ID_MSI:
@@ -172,9 +180,9 @@ static int msi_set_mask_bits(unsigned int irq, u32 mask, u32 flag)
        return 1;
 }
 
-void read_msi_msg(unsigned int irq, struct msi_msg *msg)
+void read_msi_msg_desc(struct irq_desc *desc, struct msi_msg *msg)
 {
-       struct msi_desc *entry = get_irq_msi(irq);
+       struct msi_desc *entry = get_irq_desc_msi(desc);
        switch(entry->msi_attrib.type) {
        case PCI_CAP_ID_MSI:
        {
@@ -211,9 +219,16 @@ void read_msi_msg(unsigned int irq, struct msi_msg *msg)
        }
 }
 
-void write_msi_msg(unsigned int irq, struct msi_msg *msg)
+void read_msi_msg(unsigned int irq, struct msi_msg *msg)
+{
+       struct irq_desc *desc = irq_to_desc(irq);
+
+       read_msi_msg_desc(desc, msg);
+}
+
+void write_msi_msg_desc(struct irq_desc *desc, struct msi_msg *msg)
 {
-       struct msi_desc *entry = get_irq_msi(irq);
+       struct msi_desc *entry = get_irq_desc_msi(desc);
        switch (entry->msi_attrib.type) {
        case PCI_CAP_ID_MSI:
        {
@@ -252,21 +267,31 @@ void write_msi_msg(unsigned int irq, struct msi_msg *msg)
        entry->msg = *msg;
 }
 
+void write_msi_msg(unsigned int irq, struct msi_msg *msg)
+{
+       struct irq_desc *desc = irq_to_desc(irq);
+
+       write_msi_msg_desc(desc, msg);
+}
+
 void mask_msi_irq(unsigned int irq)
 {
-       msi_set_mask_bits(irq, 1, 1);
-       msix_flush_writes(irq);
+       struct irq_desc *desc = irq_to_desc(irq);
+
+       msi_set_mask_bits(desc, 1, 1);
+       msix_flush_writes(desc);
 }
 
 void unmask_msi_irq(unsigned int irq)
 {
-       msi_set_mask_bits(irq, 1, 0);
-       msix_flush_writes(irq);
+       struct irq_desc *desc = irq_to_desc(irq);
+
+       msi_set_mask_bits(desc, 1, 0);
+       msix_flush_writes(desc);
 }
 
 static int msi_free_irqs(struct pci_dev* dev);
 
-
 static struct msi_desc* alloc_msi_entry(void)
 {
        struct msi_desc *entry;
@@ -303,9 +328,11 @@ static void __pci_restore_msi_state(struct pci_dev *dev)
        pci_intx_for_msi(dev, 0);
        msi_set_enable(dev, 0);
        write_msi_msg(dev->irq, &entry->msg);
-       if (entry->msi_attrib.maskbit)
-               msi_set_mask_bits(dev->irq, entry->msi_attrib.maskbits_mask,
+       if (entry->msi_attrib.maskbit) {
+               struct irq_desc *desc = irq_to_desc(dev->irq);
+               msi_set_mask_bits(desc, entry->msi_attrib.maskbits_mask,
                                  entry->msi_attrib.masked);
+       }
 
        pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &control);
        control &= ~PCI_MSI_FLAGS_QSIZE;
@@ -327,8 +354,9 @@ static void __pci_restore_msix_state(struct pci_dev *dev)
        msix_set_enable(dev, 0);
 
        list_for_each_entry(entry, &dev->msi_list, list) {
+               struct irq_desc *desc = irq_to_desc(entry->irq);
                write_msi_msg(entry->irq, &entry->msg);
-               msi_set_mask_bits(entry->irq, 1, entry->msi_attrib.masked);
+               msi_set_mask_bits(desc, 1, entry->msi_attrib.masked);
        }
 
        BUG_ON(list_empty(&dev->msi_list));
@@ -378,21 +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);
@@ -596,7 +621,8 @@ void pci_msi_shutdown(struct pci_dev* dev)
        /* Return the the pci reset with msi irqs unmasked */
        if (entry->msi_attrib.maskbit) {
                u32 mask = entry->msi_attrib.maskbits_mask;
-               msi_set_mask_bits(dev->irq, mask, ~mask);
+               struct irq_desc *desc = irq_to_desc(dev->irq);
+               msi_set_mask_bits(desc, mask, ~mask);
        }
        if (!entry->dev || entry->msi_attrib.type != PCI_CAP_ID_MSI)
                return;
@@ -755,28 +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);
 }