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/* $Id: sbus.h,v 1.16 1998/12/16 04:33:52 davem Exp $
* sbus.h: Defines for the Sun SBus.
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
*/
#ifndef _SPARC_SBUS_H
#define _SPARC_SBUS_H
#include <asm/oplib.h>
#include <asm/iommu.h>
/* We scan which devices are on the SBus using the PROM node device
* tree. SBus devices are described in two different ways. You can
* either get an absolute address at which to access the device, or
* you can get a SBus 'slot' number and an offset within that slot.
*/
/* The base address at which to calculate device OBIO addresses. */
#define SUN_SBUS_BVADDR 0xf8000000
#define SBUS_OFF_MASK 0x01ffffff
/* These routines are used to calculate device address from slot
* numbers + offsets, and vice versa.
*/
extern __inline__ unsigned long sbus_devaddr(int slotnum, unsigned long offset)
{
return (unsigned long) (SUN_SBUS_BVADDR+((slotnum)<<25)+(offset));
}
extern __inline__ int sbus_dev_slot(unsigned long dev_addr)
{
return (int) (((dev_addr)-SUN_SBUS_BVADDR)>>25);
}
extern __inline__ unsigned long sbus_dev_offset(unsigned long dev_addr)
{
return (unsigned long) (((dev_addr)-SUN_SBUS_BVADDR)&SBUS_OFF_MASK);
}
struct linux_sbus;
/* Linux SBUS device tables */
struct linux_sbus_device {
struct linux_sbus_device *next; /* next device on this SBus or null */
struct linux_sbus_device *child; /* For ledma and espdma on sun4m */
struct linux_sbus *my_bus; /* Back ptr to sbus */
int prom_node; /* PROM device tree node for this device */
char prom_name[32]; /* PROM device name */
struct linux_prom_registers reg_addrs[PROMREG_MAX];
int num_registers, ranges_applied;
unsigned int irqs[4];
int num_irqs;
unsigned long sbus_addr; /* Absolute base address for device. */
unsigned long sbus_vaddrs[PROMVADDR_MAX];
unsigned long num_vaddrs;
unsigned long offset; /* Offset given by PROM */
int slot;
};
/* This struct describes the SBus(s) found on this machine. */
struct linux_sbus {
struct linux_sbus *next; /* next SBus, if more than one SBus */
struct linux_sbus_device *devices; /* Link to devices on this SBus */
struct iommu_struct *iommu; /* IOMMU for this sbus if applicable */
int prom_node; /* PROM device tree node for this SBus */
char prom_name[16]; /* Usually "sbus" or "sbi" */
int clock_freq;
struct linux_prom_ranges sbus_ranges[PROMREG_MAX];
int num_sbus_ranges;
int devid;
int board;
};
extern struct linux_sbus *SBus_chain;
extern __inline__ int
sbus_is_slave(struct linux_sbus_device *dev)
{
/* Have to write this for sun4c's */
return 0;
}
/* Device probing routines could find these handy */
#define for_each_sbus(bus) \
for((bus) = SBus_chain; (bus); (bus)=(bus)->next)
#define for_each_sbusdev(device, bus) \
for((device) = (bus)->devices; (device); (device)=(device)->next)
#define for_all_sbusdev(device, bus) \
for((bus) = SBus_chain, (device) = (bus)->devices; (bus); (device)=((device)->next ? (device)->next : ((bus) = (bus)->next, (bus) ? (bus)->devices : 0)))
/* If you did not get the buffer from mmu_get_*() or sparc_alloc_dvma()
* then you must use this to get the 32-bit SBUS dvma address.
* And in this case it is your responsibility to make sure the buffer
* is GFP_DMA, ie. that it is not greater than MAX_DMA_ADDRESS.
*/
#define sbus_dvma_addr(__addr) ((__u32)(__addr))
/* Apply promlib probed SBUS ranges to registers. */
extern void prom_apply_sbus_ranges(struct linux_sbus *sbus,
struct linux_prom_registers *sbusregs,
int nregs, struct linux_sbus_device *sdev);
#endif /* !(_SPARC_SBUS_H) */
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