include/asm-sparc64/sbus.h

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 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 longsbus_devaddr(int slotnum,unsigned long offset)
 30 {
 31 return(unsigned long) (SUN_SBUS_BVADDR+((slotnum)<<28)+(offset));
 32 }
 33
 34 extern __inline__ intsbus_dev_slot(unsigned long dev_addr)
 35 {
 36 return(int) (((dev_addr)-SUN_SBUS_BVADDR)>>28);
 37 }
 38
 39 extern __inline__ unsigned longsbus_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 externstruct 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 externvoidmmu_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 externunsigned long phys_base;
 101 #define sbus_dvma_addr(__addr) ((__u32)(__pa(__addr) - phys_base))
 102
 103 /* Apply promlib probed SBUS ranges to registers. */
 104 externvoidprom_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) */