include/linux/msi.h

   1 #ifndef LINUX_MSI_H
   2 #define LINUX_MSI_H
   3
   4 #include <linux/kobject.h>
   5 #include <linux/list.h>
   6
   7 struct msi_msg {
   8         u32     address_lo;     /* low 32 bits of msi message address */
   9         u32     address_hi;     /* high 32 bits of msi message address */
  10         u32     data;           /* 16 bits of msi message data */
  11 };
  12
  13 /* Helper functions */
  14 struct irq_data;
  15 struct msi_desc;
  16 void mask_msi_irq(struct irq_data *data);
  17 void unmask_msi_irq(struct irq_data *data);
  18 void __read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
  19 void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
  20 void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
  21 void read_msi_msg(unsigned int irq, struct msi_msg *msg);
  22 void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
  23 void write_msi_msg(unsigned int irq, struct msi_msg *msg);
  24
  25 struct msi_desc {
  26         struct {
  27                 __u8    is_msix : 1;
  28                 __u8    multiple: 3;    /* log2 number of messages */
  29                 __u8    maskbit : 1;    /* mask-pending bit supported ? */
  30                 __u8    is_64   : 1;    /* Address size: 0=32bit 1=64bit */
  31                 __u8    pos;            /* Location of the msi capability */
  32                 __u16   entry_nr;       /* specific enabled entry */
  33                 unsigned default_irq;   /* default pre-assigned irq */
  34         } msi_attrib;
  35
  36         u32 masked;                     /* mask bits */
  37         unsigned int irq;
  38         unsigned int nvec_used;         /* number of messages */
  39         struct list_head list;
  40
  41         union {
  42                 void __iomem *mask_base;
  43                 u8 mask_pos;
  44         };
  45         struct pci_dev *dev;
  46
  47         /* Last set MSI message */
  48         struct msi_msg msg;
  49
  50         struct kobject kobj;
  51 };
  52
  53 /*
  54  * The arch hooks to setup up msi irqs. Those functions are
  55  * implemented as weak symbols so that they /can/ be overriden by
  56  * architecture specific code if needed.
  57  */
  58 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
  59 void arch_teardown_msi_irq(unsigned int irq);
  60 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
  61 void arch_teardown_msi_irqs(struct pci_dev *dev);
  62 int arch_msi_check_device(struct pci_dev* dev, int nvec, int type);
  63 void arch_restore_msi_irqs(struct pci_dev *dev, int irq);
  64
  65 void default_teardown_msi_irqs(struct pci_dev *dev);
  66 void default_restore_msi_irqs(struct pci_dev *dev, int irq);
  67 u32 default_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag);
  68 u32 default_msix_mask_irq(struct msi_desc *desc, u32 flag);
  69
  70 struct msi_chip {
  71         struct module *owner;
  72         struct device *dev;
  73         struct device_node *of_node;
  74         struct list_head list;
  75
  76         int (*setup_irq)(struct msi_chip *chip, struct pci_dev *dev,
  77                          struct msi_desc *desc);
  78         void (*teardown_irq)(struct msi_chip *chip, unsigned int irq);
  79         int (*check_device)(struct msi_chip *chip, struct pci_dev *dev,
  80                             int nvec, int type);
  81 };
  82
  83 #endif /* LINUX_MSI_H */