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/* $Id: sbus.h,v 1.1.1.1 2001-09-10 07:44:43 simons Exp $
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* sbus.h: Defines for the Sun SBus.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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*/
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#ifndef _SPARC_SBUS_H
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#define _SPARC_SBUS_H
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#include <asm/oplib.h>
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#include <asm/iommu.h>
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/* We scan which devices are on the SBus using the PROM node device
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* tree. SBus devices are described in two different ways. You can
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* either get an absolute address at which to access the device, or
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* you can get a SBus 'slot' number and an offset within that slot.
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*/
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/* The base address at which to calculate device OBIO addresses. */
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#define SUN_SBUS_BVADDR 0xf8000000
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#define SBUS_OFF_MASK 0x01ffffff
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/* These routines are used to calculate device address from slot
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* numbers + offsets, and vice versa.
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*/
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extern inline unsigned long sbus_devaddr(int slotnum, unsigned long offset)
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{
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return (unsigned long) (SUN_SBUS_BVADDR+((slotnum)<<25)+(offset));
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}
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extern inline int sbus_dev_slot(unsigned long dev_addr)
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{
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return (int) (((dev_addr)-SUN_SBUS_BVADDR)>>25);
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}
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extern inline unsigned long sbus_dev_offset(unsigned long dev_addr)
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{
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return (unsigned long) (((dev_addr)-SUN_SBUS_BVADDR)&SBUS_OFF_MASK);
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}
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struct linux_sbus;
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/* Linux SBUS device tables */
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struct linux_sbus_device {
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struct linux_sbus_device *next; /* next device on this SBus or null */
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struct linux_sbus_device *child; /* For ledma and espdma on sun4m */
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struct linux_sbus *my_bus; /* Back ptr to sbus */
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int prom_node; /* PROM device tree node for this device */
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char prom_name[64]; /* PROM device name */
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char linux_name[64]; /* Name used internally by Linux */
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struct linux_prom_registers reg_addrs[PROMREG_MAX];
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int num_registers;
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struct linux_prom_irqs irqs[PROMINTR_MAX];
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int num_irqs;
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unsigned long sbus_addr; /* Absolute base address for device. */
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unsigned long sbus_vaddrs[PROMVADDR_MAX];
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unsigned long num_vaddrs;
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unsigned long offset; /* Offset given by PROM */
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int slot;
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};
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/* This struct describes the SBus(s) found on this machine. */
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struct linux_sbus {
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struct linux_sbus *next; /* next SBus, if more than one SBus */
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struct linux_sbus_device *devices; /* Link to devices on this SBus */
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struct iommu_struct *iommu; /* IOMMU for this sbus if applicable */
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int prom_node; /* PROM device tree node for this SBus */
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char prom_name[64]; /* Usually "sbus" */
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int clock_freq;
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};
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extern struct linux_sbus *SBus_chain;
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extern inline int
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sbus_is_slave(struct linux_sbus_device *dev)
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{
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/* Have to write this for sun4c's */
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return 0;
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}
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/* Device probing routines could find these handy */
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#define for_each_sbus(bus) \
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for((bus) = SBus_chain; (bus); (bus)=(bus)->next)
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#define for_each_sbusdev(device, bus) \
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for((device) = (bus)->devices; (device); (device)=(device)->next)
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#endif /* !(_SPARC_SBUS_H) */
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