include/asm-sparc/sbus.h

   1 /* $Id: sbus.h,v 1.22 2000/02/18 13:50:50 davem Exp $
   2  * sbus.h:  Defines for the Sun SBus.
   3  *
   4  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   5  */
   6
   7 #ifndef _SPARC_SBUS_H
   8 #define _SPARC_SBUS_H
   9
  10 #include <linux/ioport.h>
  11
  12 #include <asm/oplib.h>
  13 #include <asm/iommu.h>
  14 #include <asm/scatterlist.h>
  15
  16 /* We scan which devices are on the SBus using the PROM node device
  17  * tree.  SBus devices are described in two different ways.  You can
  18  * either get an absolute address at which to access the device, or
  19  * you can get a SBus 'slot' number and an offset within that slot.
  20  */
  21
  22 /* The base address at which to calculate device OBIO addresses. */
  23 #define SUN_SBUS_BVADDR        0xf8000000
  24 #define SBUS_OFF_MASK          0x01ffffff
  25
  26 /* These routines are used to calculate device address from slot
  27  * numbers + offsets, and vice versa.
  28  */
  29
  30 extern __inline__ unsigned long sbus_devaddr(int slotnum, unsigned long offset)
  31 {
  32   return (unsigned long) (SUN_SBUS_BVADDR+((slotnum)<<25)+(offset));
  33 }
  34
  35 extern __inline__ int sbus_dev_slot(unsigned long dev_addr)
  36 {
  37   return (int) (((dev_addr)-SUN_SBUS_BVADDR)>>25);
  38 }
  39
  40 struct sbus_bus;
  41
  42 /* Linux SBUS device tables */
  43 struct sbus_dev {
  44         struct sbus_bus *bus;       /* Back ptr to sbus */
  45         struct sbus_dev *next;      /* next device on this SBus or null */
  46         struct sbus_dev *child;     /* For ledma and espdma on sun4m */
  47         struct sbus_dev *parent;    /* Parent device if not toplevel */
  48         int prom_node;              /* PROM device tree node for this device */
  49         char prom_name[64];         /* PROM device name */
  50         int slot;
  51
  52         struct resource resource[PROMREG_MAX];
  53
  54         struct linux_prom_registers reg_addrs[PROMREG_MAX];
  55         int num_registers, ranges_applied;
  56
  57         struct linux_prom_ranges device_ranges[PROMREG_MAX];
  58         int num_device_ranges;
  59
  60         unsigned int irqs[4];
  61         int num_irqs;
  62 };
  63
  64 /* This struct describes the SBus(s) found on this machine. */
  65 struct sbus_bus {
  66         void                    *iommu;         /* Opaque IOMMU cookie */
  67         struct sbus_dev         *devices;       /* Link to devices on this SBus */
  68         struct sbus_bus         *next;          /* next SBus, if more than one SBus */
  69         int                     prom_node;      /* PROM device tree node for this SBus */
  70         char                    prom_name[64];  /* Usually "sbus" or "sbi" */
  71         int                     clock_freq;
  72
  73         struct linux_prom_ranges sbus_ranges[PROMREG_MAX];
  74         int num_sbus_ranges;
  75
  76         int devid;
  77         int board;
  78 };
  79
  80 extern struct sbus_bus *sbus_root;
  81
  82 extern __inline__ int
  83 sbus_is_slave(struct sbus_dev *dev)
  84 {
  85         /* XXX Have to write this for sun4c's */
  86         return 0;
  87 }
  88
  89 /* Device probing routines could find these handy */
  90 #define for_each_sbus(bus) \
  91         for((bus) = sbus_root; (bus); (bus)=(bus)->next)
  92
  93 #define for_each_sbusdev(device, bus) \
  94         for((device) = (bus)->devices; (device); (device)=(device)->next)
  95
  96 #define for_all_sbusdev(device, bus) \
  97         for((bus) = sbus_root, ((device) = (bus) ? (bus)->devices : 0); (bus); (device)=((device)->next ? (device)->next : ((bus) = (bus)->next, (bus) ? (bus)->devices : 0)))
  98
  99 /* Driver DVMA interfaces. */
 100 #define sbus_can_dma_64bit(sdev)        (0) /* actually, sparc_cpu_model==sun4d */
 101 #define sbus_can_burst64(sdev)          (0) /* actually, sparc_cpu_model==sun4d */
 102 extern void sbus_set_sbus64(struct sbus_dev *, int);
 103
 104 /* These yield IOMMU mappings in consistent mode. */
 105 extern void *sbus_alloc_consistent(struct sbus_dev *, long, u32 *dma_addrp);
 106 extern void sbus_free_consistent(struct sbus_dev *, long, void *, u32);
 107
 108 #define SBUS_DMA_BIDIRECTIONAL  0
 109 #define SBUS_DMA_TODEVICE       1
 110 #define SBUS_DMA_FROMDEVICE     2
 111 #define SBUS_DMA_NONE           3
 112
 113 /* All the rest use streaming mode mappings. */
 114 extern u32 sbus_map_single(struct sbus_dev *, void *, long, int);
 115 extern void sbus_unmap_single(struct sbus_dev *, u32, long, int);
 116 extern int sbus_map_sg(struct sbus_dev *, struct scatterlist *, int, int);
 117 extern void sbus_unmap_sg(struct sbus_dev *, struct scatterlist *, int, int);
 118
 119 /* Finally, allow explicit synchronization of streamable mappings. */
 120 extern void sbus_dma_sync_single(struct sbus_dev *, u32, long, int);
 121 extern void sbus_dma_sync_sg(struct sbus_dev *, struct scatterlist *, int, int);
 122
 123 #endif /* !(_SPARC_SBUS_H) */