include/asm-sparc64/pbm.h

   1 /* $Id: pbm.h,v 1.27 2001/08/12 13:18:23 davem Exp $
   2  * pbm.h: UltraSparc PCI controller software state.
   3  *
   4  * Copyright (C) 1997, 1998, 1999 David S. Miller (davem@redhat.com)
   5  */
   6
   7 #ifndef __SPARC64_PBM_H
   8 #define __SPARC64_PBM_H
   9
  10 #include <linux/types.h>
  11 #include <linux/pci.h>
  12 #include <linux/ioport.h>
  13 #include <linux/spinlock.h>
  14
  15 #include <asm/io.h>
  16 #include <asm/page.h>
  17 #include <asm/oplib.h>
  18 #include <asm/iommu.h>
  19
  20 /* The abstraction used here is that there are PCI controllers,
  21  * each with one (Sabre) or two (PSYCHO/SCHIZO) PCI bus modules
  22  * underneath.  Each PCI bus module uses an IOMMU (shared by both
  23  * PBMs of a controller, or per-PBM), and if a streaming buffer
  24  * is present, each PCI bus module has it's own. (ie. the IOMMU
  25  * might be shared between PBMs, the STC is never shared)
  26  * Furthermore, each PCI bus module controls it's own autonomous
  27  * PCI bus.
  28  */
  29
  30 struct pci_controller_info;
  31
  32 /* This contains the software state necessary to drive a PCI
  33  * controller's IOMMU.
  34  */
  35 struct pci_iommu_arena {
  36         unsigned long   *map;
  37         unsigned int    hint;
  38         unsigned int    limit;
  39 };
  40
  41 struct pci_iommu {
  42         /* This protects the controller's IOMMU and all
  43          * streaming buffers underneath.
  44          */
  45         spinlock_t      lock;
  46
  47         struct pci_iommu_arena arena;
  48
  49         /* IOMMU page table, a linear array of ioptes. */
  50         iopte_t         *page_table;            /* The page table itself. */
  51
  52         /* Base PCI memory space address where IOMMU mappings
  53          * begin.
  54          */
  55         u32             page_table_map_base;
  56
  57         /* IOMMU Controller Registers */
  58         unsigned long   iommu_control;          /* IOMMU control register */
  59         unsigned long   iommu_tsbbase;          /* IOMMU page table base register */
  60         unsigned long   iommu_flush;            /* IOMMU page flush register */
  61         unsigned long   iommu_ctxflush;         /* IOMMU context flush register */
  62
  63         /* This is a register in the PCI controller, which if
  64          * read will have no side-effects but will guarantee
  65          * completion of all previous writes into IOMMU/STC.
  66          */
  67         unsigned long   write_complete_reg;
  68
  69         /* In order to deal with some buggy third-party PCI bridges that
  70          * do wrong prefetching, we never mark valid mappings as invalid.
  71          * Instead we point them at this dummy page.
  72          */
  73         unsigned long   dummy_page;
  74         unsigned long   dummy_page_pa;
  75
  76         /* CTX allocation. */
  77         unsigned long ctx_lowest_free;
  78         unsigned long ctx_bitmap[IOMMU_NUM_CTXS / (sizeof(unsigned long) * 8)];
  79
  80         /* Here a PCI controller driver describes the areas of
  81          * PCI memory space where DMA to/from physical memory
  82          * are addressed.  Drivers interrogate the PCI layer
  83          * if their device has addressing limitations.  They
  84          * do so via pci_dma_supported, and pass in a mask of
  85          * DMA address bits their device can actually drive.
  86          *
  87          * The test for being usable is:
  88          *      (device_mask & dma_addr_mask) == dma_addr_mask
  89          */
  90         u32 dma_addr_mask;
  91 };
  92
  93 extern void pci_iommu_table_init(struct pci_iommu *iommu, int tsbsize, u32 dma_offset, u32 dma_addr_mask);
  94
  95 /* This describes a PCI bus module's streaming buffer. */
  96 struct pci_strbuf {
  97         int             strbuf_enabled;         /* Present and using it? */
  98
  99         /* Streaming Buffer Control Registers */
 100         unsigned long   strbuf_control;         /* STC control register */
 101         unsigned long   strbuf_pflush;          /* STC page flush register */
 102         unsigned long   strbuf_fsync;           /* STC flush synchronization reg */
 103         unsigned long   strbuf_ctxflush;        /* STC context flush register */
 104         unsigned long   strbuf_ctxmatch_base;   /* STC context flush match reg */
 105         unsigned long   strbuf_flushflag_pa;    /* Physical address of flush flag */
 106         volatile unsigned long *strbuf_flushflag; /* The flush flag itself */
 107
 108         /* And this is the actual flush flag area.
 109          * We allocate extra because the chips require
 110          * a 64-byte aligned area.
 111          */
 112         volatile unsigned long  __flushflag_buf[(64 + (64 - 1)) / sizeof(long)];
 113 };
 114
 115 #define PCI_STC_FLUSHFLAG_INIT(STC) \
 116         (*((STC)->strbuf_flushflag) = 0UL)
 117 #define PCI_STC_FLUSHFLAG_SET(STC) \
 118         (*((STC)->strbuf_flushflag) != 0UL)
 119
 120 /* There can be quite a few ranges and interrupt maps on a PCI
 121  * segment.  Thus...
 122  */
 123 #define PROM_PCIRNG_MAX         64
 124 #define PROM_PCIIMAP_MAX        64
 125
 126 struct pci_pbm_info {
 127         /* PCI controller we sit under. */
 128         struct pci_controller_info      *parent;
 129
 130         /* Physical address base of controller registers. */
 131         unsigned long                   controller_regs;
 132
 133         /* Physical address base of PBM registers. */
 134         unsigned long                   pbm_regs;
 135
 136         /* Physical address of DMA sync register, if any.  */
 137         unsigned long                   sync_reg;
 138
 139         /* Opaque 32-bit system bus Port ID. */
 140         u32                             portid;
 141
 142         /* Chipset version information. */
 143         int                             chip_type;
 144 #define PBM_CHIP_TYPE_SABRE             1
 145 #define PBM_CHIP_TYPE_PSYCHO            2
 146 #define PBM_CHIP_TYPE_SCHIZO            3
 147 #define PBM_CHIP_TYPE_SCHIZO_PLUS       4
 148 #define PBM_CHIP_TYPE_TOMATILLO         5
 149         int                             chip_version;
 150         int                             chip_revision;
 151
 152         /* Name used for top-level resources. */
 153         char                            name[64];
 154
 155         /* OBP specific information. */
 156         int                             prom_node;
 157         char                            prom_name[64];
 158         struct linux_prom_pci_ranges    pbm_ranges[PROM_PCIRNG_MAX];
 159         int                             num_pbm_ranges;
 160         struct linux_prom_pci_intmap    pbm_intmap[PROM_PCIIMAP_MAX];
 161         int                             num_pbm_intmap;
 162         struct linux_prom_pci_intmask   pbm_intmask;
 163         u64                             ino_bitmap;
 164
 165         /* PBM I/O and Memory space resources. */
 166         struct resource                 io_space;
 167         struct resource                 mem_space;
 168
 169         /* Base of PCI Config space, can be per-PBM or shared. */
 170         unsigned long                   config_space;
 171
 172         /* State of 66MHz capabilities on this PBM. */
 173         int                             is_66mhz_capable;
 174         int                             all_devs_66mhz;
 175
 176         /* This PBM's streaming buffer. */
 177         struct pci_strbuf               stc;
 178
 179         /* IOMMU state, potentially shared by both PBM segments. */
 180         struct pci_iommu                *iommu;
 181
 182         /* PCI slot mapping. */
 183         unsigned int                    pci_first_slot;
 184
 185         /* Now things for the actual PCI bus probes. */
 186         unsigned int                    pci_first_busno;
 187         unsigned int                    pci_last_busno;
 188         struct pci_bus                  *pci_bus;
 189 };
 190
 191 struct pci_controller_info {
 192         /* List of all PCI controllers. */
 193         struct pci_controller_info      *next;
 194
 195         /* Each controller gets a unique index, used mostly for
 196          * error logging purposes.
 197          */
 198         int                             index;
 199
 200         /* Do the PBMs both exist in the same PCI domain? */
 201         int                             pbms_same_domain;
 202
 203         /* The PCI bus modules controlled by us. */
 204         struct pci_pbm_info             pbm_A;
 205         struct pci_pbm_info             pbm_B;
 206
 207         /* Operations which are controller specific. */
 208         void (*scan_bus)(struct pci_controller_info *);
 209         unsigned int (*irq_build)(struct pci_pbm_info *, struct pci_dev *, unsigned int);
 210         void (*base_address_update)(struct pci_dev *, int);
 211         void (*resource_adjust)(struct pci_dev *, struct resource *, struct resource *);
 212
 213         /* Now things for the actual PCI bus probes. */
 214         struct pci_ops                  *pci_ops;
 215         unsigned int                    pci_first_busno;
 216         unsigned int                    pci_last_busno;
 217
 218         void                            *starfire_cookie;
 219 };
 220
 221 /* PCI devices which are not bridges have this placed in their pci_dev
 222  * sysdata member.  This makes OBP aware PCI device drivers easier to
 223  * code.
 224  */
 225 struct pcidev_cookie {
 226         struct pci_pbm_info             *pbm;
 227         char                            prom_name[64];
 228         int                             prom_node;
 229         struct linux_prom_pci_registers prom_regs[PROMREG_MAX];
 230         int num_prom_regs;
 231         struct linux_prom_pci_registers prom_assignments[PROMREG_MAX];
 232         int num_prom_assignments;
 233 };
 234
 235 /* Currently these are the same across all PCI controllers
 236  * we support.  Someday they may not be...
 237  */
 238 #define PCI_IRQ_IGN     0x000007c0      /* Interrupt Group Number */
 239 #define PCI_IRQ_INO     0x0000003f      /* Interrupt Number */
 240
 241 #endif /* !(__SPARC64_PBM_H) */