include/asm-sparc64/sbus.h

   1 /* $Id: sbus.h,v 1.10 1998/12/16 04:33:58 davem Exp $
   2  * sbus.h:  Defines for the Sun SBus.
   3  *
   4  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   5  */
   6
   7 /* XXX This needs to be mostly redone for sun5 SYSIO. */
   8
   9 #ifndef _SPARC64_SBUS_H
  10 #define _SPARC64_SBUS_H
  11
  12 #include <asm/oplib.h>
  13 #include <asm/iommu.h>
  14
  15 /* We scan which devices are on the SBus using the PROM node device
  16  * tree.  SBus devices are described in two different ways.  You can
  17  * either get an absolute address at which to access the device, or
  18  * you can get a SBus 'slot' number and an offset within that slot.
  19  */
  20
  21 /* The base address at which to calculate device OBIO addresses. */
  22 #define SUN_SBUS_BVADDR        0x00000000
  23 #define SBUS_OFF_MASK          0x0fffffff
  24
  25 /* These routines are used to calculate device address from slot
  26  * numbers + offsets, and vice versa.
  27  */
  28
  29 extern __inline__ unsigned long sbus_devaddr(int slotnum, unsigned long offset)
  30 {
  31   return (unsigned long) (SUN_SBUS_BVADDR+((slotnum)<<28)+(offset));
  32 }
  33
  34 extern __inline__ int sbus_dev_slot(unsigned long dev_addr)
  35 {
  36   return (int) (((dev_addr)-SUN_SBUS_BVADDR)>>28);
  37 }
  38
  39 extern __inline__ unsigned long sbus_dev_offset(unsigned long dev_addr)
  40 {
  41   return (unsigned long) (((dev_addr)-SUN_SBUS_BVADDR)&SBUS_OFF_MASK);
  42 }
  43
  44 struct linux_sbus;
  45
  46 /* Linux SBUS device tables */
  47 struct linux_sbus_device {
  48   struct linux_sbus_device *next;      /* next device on this SBus or null */
  49   struct linux_sbus_device *child;     /* For ledma and espdma on sun4m */
  50   struct linux_sbus *my_bus;           /* Back ptr to sbus */
  51   int prom_node;                       /* PROM device tree node for this device */
  52   char prom_name[32];                  /* PROM device name */
  53
  54   struct linux_prom_registers reg_addrs[PROMREG_MAX];
  55   int num_registers, ranges_applied;
  56
  57   unsigned int irqs[4];
  58   int num_irqs;
  59
  60   unsigned long sbus_addr;             /* Absolute base address for device. */
  61   unsigned long sbus_vaddrs[PROMVADDR_MAX];
  62   unsigned long num_vaddrs;
  63   unsigned long offset;                /* Offset given by PROM */
  64   int slot;
  65 };
  66
  67 /* This struct describes the SBus(s) found on this machine. */
  68 struct linux_sbus {
  69         struct linux_sbus *next;             /* next SBus, if more than one SBus */
  70         struct linux_sbus_device *devices;   /* Link to devices on this SBus */
  71         struct iommu_struct *iommu;          /* IOMMU for this sbus if applicable */
  72         int prom_node;                       /* PROM device tree node for this SBus */
  73         char prom_name[64];                  /* Usually "sbus" or "sbi" */
  74         int clock_freq;
  75         struct linux_prom_ranges sbus_ranges[PROMREG_MAX];
  76         int num_sbus_ranges;
  77         int upaid;
  78         void *starfire_cookie;
  79 };
  80
  81 extern struct linux_sbus *SBus_chain;
  82
  83 /* Device probing routines could find these handy */
  84 #define for_each_sbus(bus) \
  85         for((bus) = SBus_chain; (bus); (bus)=(bus)->next)
  86
  87 #define for_each_sbusdev(device, bus) \
  88         for((device) = (bus)->devices; (device); (device)=(device)->next)
  89
  90 #define for_all_sbusdev(device, bus) \
  91         for((bus) = SBus_chain, ((device) = (bus) ? (bus)->devices : 0); (bus); (device)=((device)->next ? (device)->next : ((bus) = (bus)->next, (bus) ? (bus)->devices : 0)))
  92
  93 extern void mmu_set_sbus64(struct linux_sbus_device *, int);
  94
  95 /* If you did not get the buffer from mmu_get_*() or sparc_alloc_dvma()
  96  * then you must use this to get the 32-bit SBUS dvma address.
  97  * And in this case it is your responsibility to make sure the buffer
  98  * is GFP_DMA, ie. that it is not greater than MAX_DMA_ADDRESS.
  99  */
 100 extern unsigned long phys_base;
 101 #define sbus_dvma_addr(__addr)  ((__u32)(__pa(__addr) - phys_base))
 102
 103 /* Apply promlib probed SBUS ranges to registers. */
 104 extern void prom_apply_sbus_ranges(struct linux_sbus *sbus,
 105                                    struct linux_prom_registers *sbusregs, int nregs,
 106                                    struct linux_sbus_device *sdev);
 107
 108 #endif /* !(_SPARC64_SBUS_H) */