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/dma-mapping.h>
  11 #include <linux/ioport.h>
  12
  13 #include <asm/oplib.h>
  14 /* #include <asm/iommu.h> */ /* Unused since we use opaque iommu (|io-unit) */
  15 #include <asm/scatterlist.h>
  16
  17 /* We scan which devices are on the SBus using the PROM node device
  18  * tree.  SBus devices are described in two different ways.  You can
  19  * either get an absolute address at which to access the device, or
  20  * you can get a SBus 'slot' number and an offset within that slot.
  21  */
  22
  23 /* The base address at which to calculate device OBIO addresses. */
  24 #define SUN_SBUS_BVADDR        0xf8000000
  25 #define SBUS_OFF_MASK          0x01ffffff
  26
  27 /* These routines are used to calculate device address from slot
  28  * numbers + offsets, and vice versa.
  29  */
  30
  31 static inline unsigned long sbus_devaddr(int slotnum, unsigned long offset)
  32 {
  33   return (unsigned long) (SUN_SBUS_BVADDR+((slotnum)<<25)+(offset));
  34 }
  35
  36 static inline int sbus_dev_slot(unsigned long dev_addr)
  37 {
  38   return (int) (((dev_addr)-SUN_SBUS_BVADDR)>>25);
  39 }
  40
  41 struct sbus_bus;
  42
  43 /* Linux SBUS device tables */
  44 struct sbus_dev {
  45         struct sbus_bus *bus;       /* Back ptr to sbus */
  46         struct sbus_dev *next;      /* next device on this SBus or null */
  47         struct sbus_dev *child;     /* For ledma and espdma on sun4m */
  48         struct sbus_dev *parent;    /* Parent device if not toplevel */
  49         int prom_node;              /* PROM device tree node for this device */
  50         char prom_name[64];         /* PROM device name */
  51         int slot;
  52
  53         struct resource resource[PROMREG_MAX];
  54
  55         struct linux_prom_registers reg_addrs[PROMREG_MAX];
  56         int num_registers, ranges_applied;
  57
  58         struct linux_prom_ranges device_ranges[PROMREG_MAX];
  59         int num_device_ranges;
  60
  61         unsigned int irqs[4];
  62         int num_irqs;
  63 };
  64
  65 /* This struct describes the SBus(s) found on this machine. */
  66 struct sbus_bus {
  67         void                    *iommu;         /* Opaque IOMMU cookie */
  68         struct sbus_dev         *devices;       /* Link to devices on this SBus */
  69         struct sbus_bus         *next;          /* next SBus, if more than one SBus */
  70         int                     prom_node;      /* PROM device tree node for this SBus */
  71         char                    prom_name[64];  /* Usually "sbus" or "sbi" */
  72         int                     clock_freq;
  73
  74         struct linux_prom_ranges sbus_ranges[PROMREG_MAX];
  75         int num_sbus_ranges;
  76
  77         int devid;
  78         int board;
  79 };
  80
  81 extern struct sbus_bus *sbus_root;
  82
  83 static inline int
  84 sbus_is_slave(struct sbus_dev *dev)
  85 {
  86         /* XXX Have to write this for sun4c's */
  87         return 0;
  88 }
  89
  90 /* Device probing routines could find these handy */
  91 #define for_each_sbus(bus) \
  92         for((bus) = sbus_root; (bus); (bus)=(bus)->next)
  93
  94 #define for_each_sbusdev(device, bus) \
  95         for((device) = (bus)->devices; (device); (device)=(device)->next)
  96
  97 #define for_all_sbusdev(device, bus) \
  98         for ((bus) = sbus_root; (bus); (bus) = (bus)->next) \
  99                 for ((device) = (bus)->devices; (device); (device) = (device)->next)
 100
 101 /* Driver DVMA interfaces. */
 102 #define sbus_can_dma_64bit(sdev)        (0) /* actually, sparc_cpu_model==sun4d */
 103 #define sbus_can_burst64(sdev)          (0) /* actually, sparc_cpu_model==sun4d */
 104 extern void sbus_set_sbus64(struct sbus_dev *, int);
 105
 106 /* These yield IOMMU mappings in consistent mode. */
 107 extern void *sbus_alloc_consistent(struct sbus_dev *, long, u32 *dma_addrp);
 108 extern void sbus_free_consistent(struct sbus_dev *, long, void *, u32);
 109 void prom_adjust_ranges(struct linux_prom_ranges *, int,
 110                         struct linux_prom_ranges *, int);
 111
 112 #define SBUS_DMA_BIDIRECTIONAL  DMA_BIDIRECTIONAL
 113 #define SBUS_DMA_TODEVICE       DMA_TO_DEVICE
 114 #define SBUS_DMA_FROMDEVICE     DMA_FROM_DEVICE
 115 #define SBUS_DMA_NONE           DMA_NONE
 116
 117 /* All the rest use streaming mode mappings. */
 118 extern dma_addr_t sbus_map_single(struct sbus_dev *, void *, size_t, int);
 119 extern void sbus_unmap_single(struct sbus_dev *, dma_addr_t, size_t, int);
 120 extern int sbus_map_sg(struct sbus_dev *, struct scatterlist *, int, int);
 121 extern void sbus_unmap_sg(struct sbus_dev *, struct scatterlist *, int, int);
 122
 123 /* Finally, allow explicit synchronization of streamable mappings. */
 124 extern void sbus_dma_sync_single_for_cpu(struct sbus_dev *, dma_addr_t, size_t, int);
 125 #define sbus_dma_sync_single sbus_dma_sync_single_for_cpu
 126 extern void sbus_dma_sync_single_for_device(struct sbus_dev *, dma_addr_t, size_t, int);
 127 extern void sbus_dma_sync_sg_for_cpu(struct sbus_dev *, struct scatterlist *, int, int);
 128 #define sbus_dma_sync_sg sbus_dma_sync_sg_for_cpu
 129 extern void sbus_dma_sync_sg_for_device(struct sbus_dev *, struct scatterlist *, int, int);
 130
 131 /* Eric Brower (ebrower@usa.net)
 132  * Translate SBus interrupt levels to ino values--
 133  * this is used when converting sbus "interrupts" OBP
 134  * node values to "intr" node values, and is platform
 135  * dependent.  If only we could call OBP with
 136  * "sbus-intr>cpu (sbint -- ino)" from kernel...
 137  * See .../drivers/sbus/sbus.c for details.
 138  */
 139 BTFIXUPDEF_CALL(unsigned int, sbint_to_irq, struct sbus_dev *sdev, unsigned int)
 140 #define sbint_to_irq(sdev, sbint) BTFIXUP_CALL(sbint_to_irq)(sdev, sbint)
 141
 142 #endif /* !(_SPARC_SBUS_H) */