drivers/pci/msi.h

   1 /*
   2  * Copyright (C) 2003-2004 Intel
   3  * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
   4  */
   5
   6 #ifndef MSI_H
   7 #define MSI_H
   8
   9 #include <asm/msi.h>
  10
  11 /*
  12  * Assume the maximum number of hot plug slots supported by the system is about
  13  * ten. The worstcase is that each of these slots is hot-added with a device,
  14  * which has two MSI/MSI-X capable functions. To avoid any MSI-X driver, which
  15  * attempts to request all available vectors, NR_HP_RESERVED_VECTORS is defined
  16  * as below to ensure at least one message is assigned to each detected MSI/
  17  * MSI-X device function.
  18  */
  19 #define NR_HP_RESERVED_VECTORS  20
  20
  21 extern int vector_irq[NR_VECTORS];
  22 extern void (*interrupt[NR_IRQS])(void);
  23 extern int pci_vector_resources(int last, int nr_released);
  24
  25 /*
  26  * MSI-X Address Register
  27  */
  28 #define PCI_MSIX_FLAGS_QSIZE            0x7FF
  29 #define PCI_MSIX_FLAGS_ENABLE           (1 << 15)
  30 #define PCI_MSIX_FLAGS_BIRMASK          (7 << 0)
  31 #define PCI_MSIX_FLAGS_BITMASK          (1 << 0)
  32
  33 #define PCI_MSIX_ENTRY_SIZE                     16
  34 #define  PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET       0
  35 #define  PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET       4
  36 #define  PCI_MSIX_ENTRY_DATA_OFFSET             8
  37 #define  PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET      12
  38
  39 #define msi_control_reg(base)           (base + PCI_MSI_FLAGS)
  40 #define msi_lower_address_reg(base)     (base + PCI_MSI_ADDRESS_LO)
  41 #define msi_upper_address_reg(base)     (base + PCI_MSI_ADDRESS_HI)
  42 #define msi_data_reg(base, is64bit)     \
  43         ( (is64bit == 1) ? base+PCI_MSI_DATA_64 : base+PCI_MSI_DATA_32 )
  44 #define msi_mask_bits_reg(base, is64bit) \
  45         ( (is64bit == 1) ? base+PCI_MSI_MASK_BIT : base+PCI_MSI_MASK_BIT-4)
  46 #define msi_disable(control)            control &= ~PCI_MSI_FLAGS_ENABLE
  47 #define multi_msi_capable(control) \
  48         (1 << ((control & PCI_MSI_FLAGS_QMASK) >> 1))
  49 #define multi_msi_enable(control, num) \
  50         control |= (((num >> 1) << 4) & PCI_MSI_FLAGS_QSIZE);
  51 #define is_64bit_address(control)       (!!(control & PCI_MSI_FLAGS_64BIT))
  52 #define is_mask_bit_support(control)    (!!(control & PCI_MSI_FLAGS_MASKBIT))
  53 #define msi_enable(control, num) multi_msi_enable(control, num); \
  54         control |= PCI_MSI_FLAGS_ENABLE
  55
  56 #define msix_table_offset_reg(base)     (base + 0x04)
  57 #define msix_pba_offset_reg(base)       (base + 0x08)
  58 #define msix_enable(control)            control |= PCI_MSIX_FLAGS_ENABLE
  59 #define msix_disable(control)           control &= ~PCI_MSIX_FLAGS_ENABLE
  60 #define msix_table_size(control)        ((control & PCI_MSIX_FLAGS_QSIZE)+1)
  61 #define multi_msix_capable              msix_table_size
  62 #define msix_unmask(address)            (address & ~PCI_MSIX_FLAGS_BITMASK)
  63 #define msix_mask(address)              (address | PCI_MSIX_FLAGS_BITMASK)
  64 #define msix_is_pending(address)        (address & PCI_MSIX_FLAGS_PENDMASK)
  65
  66 struct msi_desc {
  67         struct {
  68                 __u8    type    : 5;    /* {0: unused, 5h:MSI, 11h:MSI-X} */
  69                 __u8    maskbit : 1;    /* mask-pending bit supported ?   */
  70                 __u8    state   : 1;    /* {0: free, 1: busy}             */
  71                 __u8    is_64   : 1;    /* Address size: 0=32bit 1=64bit  */
  72                 __u8    entry_nr;       /* specific enabled entry         */
  73                 __u8    default_vector; /* default pre-assigned vector    */
  74                 __u8    pos;            /* Location of the msi capability */
  75         }msi_attrib;
  76
  77         struct {
  78                 __u16   head;
  79                 __u16   tail;
  80         }link;
  81
  82         void __iomem *mask_base;
  83         struct pci_dev *dev;
  84
  85 #ifdef CONFIG_PM
  86         /* PM save area for MSIX address/data */
  87         struct msi_msg msg_save;
  88 #endif
  89 };
  90
  91 #endif /* MSI_H */