arch/alpha/kernel/pci_impl.h

   1 /*
   2  *      linux/arch/alpha/kernel/pci_impl.h
   3  *
   4  * This file contains declarations and inline functions for interfacing
   5  * with the PCI initialization routines.
   6  */
   7
   8 struct pci_dev;
   9 struct pci_controller;
  10 struct pci_iommu_arena;
  11
  12 /*
  13  * We can't just blindly use 64K for machines with EISA busses; they
  14  * may also have PCI-PCI bridges present, and then we'd configure the
  15  * bridge incorrectly.
  16  *
  17  * Also, we start at 0x8000 or 0x9000, in hopes to get all devices'
  18  * IO space areas allocated *before* 0xC000; this is because certain
  19  * BIOSes (Millennium for one) use PCI Config space "mechanism #2"
  20  * accesses to probe the bus. If a device's registers appear at 0xC000,
  21  * it may see an INx/OUTx at that address during BIOS emulation of the
  22  * VGA BIOS, and some cards, notably Adaptec 2940UW, take mortal offense.
  23  */
  24
  25 #define EISA_DEFAULT_IO_BASE    0x9000  /* start above 8th slot */
  26 #define DEFAULT_IO_BASE         0x8000  /* start at 8th slot */
  27
  28 /*
  29  * We try to make the DEFAULT_MEM_BASE addresses *always* have more than
  30  * a single bit set. This is so that devices like the broken Myrinet card
  31  * will always have a PCI memory address that will never match a IDSEL
  32  * address in PCI Config space, which can cause problems with early rev cards.
  33  */
  34
  35 /*
  36  * An XL is AVANTI (APECS) family, *but* it has only 27 bits of ISA address
  37  * that get passed through the PCI<->ISA bridge chip. Although this causes
  38  * us to set the PCI->Mem window bases lower than normal, we still allocate
  39  * PCI bus devices' memory addresses *below* the low DMA mapping window,
  40  * and hope they fit below 64Mb (to avoid conflicts), and so that they can
  41  * be accessed via SPARSE space.
  42  *
  43  * We accept the risk that a broken Myrinet card will be put into a true XL
  44  * and thus can more easily run into the problem described below.
  45  */
  46 #define XL_DEFAULT_MEM_BASE ((16+2)*1024*1024) /* 16M to 64M-1 is avail */
  47
  48 /*
  49  * APECS and LCA have only 34 bits for physical addresses, thus limiting PCI
  50  * bus memory addresses for SPARSE access to be less than 128Mb.
  51  */
  52 #define APECS_AND_LCA_DEFAULT_MEM_BASE ((16+2)*1024*1024)
  53
  54 /*
  55  * Because MCPCIA and T2 core logic support more bits for
  56  * physical addresses, they should allow an expanded range of SPARSE
  57  * memory addresses.  However, we do not use them all, in order to
  58  * avoid the HAE manipulation that would be needed.
  59  */
  60 #define MCPCIA_DEFAULT_MEM_BASE ((32+2)*1024*1024)
  61 #define T2_DEFAULT_MEM_BASE ((16+1)*1024*1024)
  62
  63 /*
  64  * Because CIA and PYXIS have more bits for physical addresses,
  65  * they support an expanded range of SPARSE memory addresses.
  66  */
  67 #define DEFAULT_MEM_BASE ((128+16)*1024*1024)
  68
  69 /* ??? Experimenting with no HAE for CIA.  */
  70 #define CIA_DEFAULT_MEM_BASE ((32+2)*1024*1024)
  71
  72 #define IRONGATE_DEFAULT_MEM_BASE ((256*8-16)*1024*1024)
  73
  74 #define DEFAULT_AGP_APER_SIZE   (64*1024*1024)
  75
  76 /*
  77  * A small note about bridges and interrupts.  The DECchip 21050 (and
  78  * later) adheres to the PCI-PCI bridge specification.  This says that
  79  * the interrupts on the other side of a bridge are swizzled in the
  80  * following manner:
  81  *
  82  * Dev    Interrupt   Interrupt
  83  *        Pin on      Pin on
  84  *        Device      Connector
  85  *
  86  *   4    A           A
  87  *        B           B
  88  *        C           C
  89  *        D           D
  90  *
  91  *   5    A           B
  92  *        B           C
  93  *        C           D
  94  *        D           A
  95  *
  96  *   6    A           C
  97  *        B           D
  98  *        C           A
  99  *        D           B
 100  *
 101  *   7    A           D
 102  *        B           A
 103  *        C           B
 104  *        D           C
 105  *
 106  *   Where A = pin 1, B = pin 2 and so on and pin=0 = default = A.
 107  *   Thus, each swizzle is ((pin-1) + (device#-4)) % 4
 108  *
 109  *   pci_swizzle_interrupt_pin() swizzles for exactly one bridge.  The routine
 110  *   pci_common_swizzle() handles multiple bridges.  But there are a
 111  *   couple boards that do strange things.
 112  */
 113
 114
 115 /* The following macro is used to implement the table-based irq mapping
 116    function for all single-bus Alphas.  */
 117
 118 #define COMMON_TABLE_LOOKUP                                             \
 119 ({ long _ctl_ = -1;                                                     \
 120    if (slot >= min_idsel && slot <= max_idsel && pin < irqs_per_slot)   \
 121      _ctl_ = irq_tab[slot - min_idsel][pin];                            \
 122    _ctl_; })
 123
 124
 125 /* A PCI IOMMU allocation arena.  There are typically two of these
 126    regions per bus.  */
 127 /* ??? The 8400 has a 32-byte pte entry, and the entire table apparently
 128    lives directly on the host bridge (no tlb?).  We don't support this
 129    machine, but if we ever did, we'd need to parameterize all this quite
 130    a bit further.  Probably with per-bus operation tables.  */
 131
 132 struct pci_iommu_arena
 133 {
 134         spinlock_t lock;
 135         struct pci_controller *hose;
 136 #define IOMMU_INVALID_PTE 0x2 /* 32:63 bits MBZ */
 137 #define IOMMU_RESERVED_PTE 0xface
 138         unsigned long *ptes;
 139         dma_addr_t dma_base;
 140         unsigned int size;
 141         unsigned int next_entry;
 142         unsigned int align_entry;
 143 };
 144
 145 #if defined(CONFIG_ALPHA_SRM) && \
 146     (defined(CONFIG_ALPHA_CIA) || defined(CONFIG_ALPHA_LCA))
 147 # define NEED_SRM_SAVE_RESTORE
 148 #else
 149 # undef NEED_SRM_SAVE_RESTORE
 150 #endif
 151
 152 #if defined(CONFIG_ALPHA_GENERIC) || defined(NEED_SRM_SAVE_RESTORE)
 153 # define ALPHA_RESTORE_SRM_SETUP
 154 #else
 155 # undef ALPHA_RESTORE_SRM_SETUP
 156 #endif
 157
 158 #ifdef ALPHA_RESTORE_SRM_SETUP
 159 /* Store PCI device configuration left by SRM here. */
 160 struct pdev_srm_saved_conf
 161 {
 162         struct pdev_srm_saved_conf *next;
 163         struct pci_dev *dev;
 164 };
 165
 166 extern void pci_restore_srm_config(void);
 167 #else
 168 #define pdev_save_srm_config(dev)       do {} while (0)
 169 #define pci_restore_srm_config()        do {} while (0)
 170 #endif
 171
 172 /* The hose list.  */
 173 extern struct pci_controller *hose_head, **hose_tail;
 174 extern struct pci_controller *pci_isa_hose;
 175
 176 /* Indicate that we trust the console to configure things properly.  */
 177 extern int pci_probe_only;
 178
 179 extern unsigned long alpha_agpgart_size;
 180
 181 extern void common_init_pci(void);
 182 #define common_swizzle pci_common_swizzle
 183 extern struct pci_controller *alloc_pci_controller(void);
 184 extern struct resource *alloc_resource(void);
 185
 186 extern struct pci_iommu_arena *iommu_arena_new_node(int,
 187                                                     struct pci_controller *,
 188                                                     dma_addr_t, unsigned long,
 189                                                     unsigned long);
 190 extern struct pci_iommu_arena *iommu_arena_new(struct pci_controller *,
 191                                                dma_addr_t, unsigned long,
 192                                                unsigned long);
 193 extern const char *const pci_io_names[];
 194 extern const char *const pci_mem_names[];
 195 extern const char pci_hae0_name[];
 196
 197 extern unsigned long size_for_memory(unsigned long max);
 198
 199 extern int iommu_reserve(struct pci_iommu_arena *, long, long);
 200 extern int iommu_release(struct pci_iommu_arena *, long, long);
 201 extern int iommu_bind(struct pci_iommu_arena *, long, long, struct page **);
 202 extern int iommu_unbind(struct pci_iommu_arena *, long, long);
 203
 204