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-rw-r--r--include/linux/msi.h109
1 files changed, 82 insertions, 27 deletions
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 8ac4a68ff..ad939d0ba 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -14,38 +14,85 @@ extern int pci_msi_ignore_mask;
/* Helper functions */
struct irq_data;
struct msi_desc;
+struct pci_dev;
+struct platform_msi_priv_data;
void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
+typedef void (*irq_write_msi_msg_t)(struct msi_desc *desc,
+ struct msi_msg *msg);
+
+/**
+ * platform_msi_desc - Platform device specific msi descriptor data
+ * @msi_priv_data: Pointer to platform private data
+ * @msi_index: The index of the MSI descriptor for multi MSI
+ */
+struct platform_msi_desc {
+ struct platform_msi_priv_data *msi_priv_data;
+ u16 msi_index;
+};
+
+/**
+ * struct msi_desc - Descriptor structure for MSI based interrupts
+ * @list: List head for management
+ * @irq: The base interrupt number
+ * @nvec_used: The number of vectors used
+ * @dev: Pointer to the device which uses this descriptor
+ * @msg: The last set MSI message cached for reuse
+ *
+ * @masked: [PCI MSI/X] Mask bits
+ * @is_msix: [PCI MSI/X] True if MSI-X
+ * @multiple: [PCI MSI/X] log2 num of messages allocated
+ * @multi_cap: [PCI MSI/X] log2 num of messages supported
+ * @maskbit: [PCI MSI/X] Mask-Pending bit supported?
+ * @is_64: [PCI MSI/X] Address size: 0=32bit 1=64bit
+ * @entry_nr: [PCI MSI/X] Entry which is described by this descriptor
+ * @default_irq:[PCI MSI/X] The default pre-assigned non-MSI irq
+ * @mask_pos: [PCI MSI] Mask register position
+ * @mask_base: [PCI MSI-X] Mask register base address
+ * @platform: [platform] Platform device specific msi descriptor data
+ */
struct msi_desc {
- struct {
- __u8 is_msix : 1;
- __u8 multiple: 3; /* log2 num of messages allocated */
- __u8 multi_cap : 3; /* log2 num of messages supported */
- __u8 maskbit : 1; /* mask-pending bit supported ? */
- __u8 is_64 : 1; /* Address size: 0=32bit 1=64bit */
- __u16 entry_nr; /* specific enabled entry */
- unsigned default_irq; /* default pre-assigned irq */
- } msi_attrib;
-
- u32 masked; /* mask bits */
- unsigned int irq;
- unsigned int nvec_used; /* number of messages */
- struct list_head list;
+ /* Shared device/bus type independent data */
+ struct list_head list;
+ unsigned int irq;
+ unsigned int nvec_used;
+ struct device *dev;
+ struct msi_msg msg;
union {
- void __iomem *mask_base;
- u8 mask_pos;
- };
- struct pci_dev *dev;
+ /* PCI MSI/X specific data */
+ struct {
+ u32 masked;
+ struct {
+ __u8 is_msix : 1;
+ __u8 multiple : 3;
+ __u8 multi_cap : 3;
+ __u8 maskbit : 1;
+ __u8 is_64 : 1;
+ __u16 entry_nr;
+ unsigned default_irq;
+ } msi_attrib;
+ union {
+ u8 mask_pos;
+ void __iomem *mask_base;
+ };
+ };
- /* Last set MSI message */
- struct msi_msg msg;
+ /*
+ * Non PCI variants add their data structure here. New
+ * entries need to use a named structure. We want
+ * proper name spaces for this. The PCI part is
+ * anonymous for now as it would require an immediate
+ * tree wide cleanup.
+ */
+ struct platform_msi_desc platform;
+ };
};
/* Helpers to hide struct msi_desc implementation details */
-#define msi_desc_to_dev(desc) (&(desc)->dev.dev)
-#define dev_to_msi_list(dev) (&to_pci_dev((dev))->msi_list)
+#define msi_desc_to_dev(desc) ((desc)->dev)
+#define dev_to_msi_list(dev) (&(dev)->msi_list)
#define first_msi_entry(dev) \
list_first_entry(dev_to_msi_list((dev)), struct msi_desc, list)
#define for_each_msi_entry(desc, dev) \
@@ -56,12 +103,17 @@ struct msi_desc {
#define for_each_pci_msi_entry(desc, pdev) \
for_each_msi_entry((desc), &(pdev)->dev)
-static inline struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc)
+struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc);
+void *msi_desc_to_pci_sysdata(struct msi_desc *desc);
+#else /* CONFIG_PCI_MSI */
+static inline void *msi_desc_to_pci_sysdata(struct msi_desc *desc)
{
- return desc->dev;
+ return NULL;
}
#endif /* CONFIG_PCI_MSI */
+struct msi_desc *alloc_msi_entry(struct device *dev);
+void free_msi_entry(struct msi_desc *entry);
void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg);
@@ -108,9 +160,6 @@ struct msi_controller {
struct device *dev;
struct device_node *of_node;
struct list_head list;
-#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
- struct irq_domain *domain;
-#endif
int (*setup_irq)(struct msi_controller *chip, struct pci_dev *dev,
struct msi_desc *desc);
@@ -221,6 +270,12 @@ int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
+struct irq_domain *platform_msi_create_irq_domain(struct device_node *np,
+ struct msi_domain_info *info,
+ struct irq_domain *parent);
+int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
+ irq_write_msi_msg_t write_msi_msg);
+void platform_msi_domain_free_irqs(struct device *dev);
#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN