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/* $Id: sbus.h,v 1.1.1.1 2004-04-15 02:40:33 phoenix 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 <linux/ioport.h>

#include <asm/oplib.h>

#include <asm/iommu.h>

#include <asm/scatterlist.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);

}

struct sbus_bus;

/* Linux SBUS device tables */

struct sbus_dev {

        struct sbus_bus *bus;       /* Back ptr to sbus */

        struct sbus_dev *next;      /* next device on this SBus or null */

        struct sbus_dev *child;     /* For ledma and espdma on sun4m */

        struct sbus_dev *parent;    /* Parent device if not toplevel */

        int prom_node;              /* PROM device tree node for this device */

        char prom_name[64];         /* PROM device name */

        int slot;

        struct resource resource[PROMREG_MAX];

        struct linux_prom_registers reg_addrs[PROMREG_MAX];

        int num_registers, ranges_applied;

        struct linux_prom_ranges device_ranges[PROMREG_MAX];

        int num_device_ranges;

        unsigned int irqs[4];

        int num_irqs;

};

/* This struct describes the SBus(s) found on this machine. */

struct sbus_bus {

        void                    *iommu;         /* Opaque IOMMU cookie */

        struct sbus_dev         *devices;       /* Link to devices on this SBus */

        struct sbus_bus         *next;          /* next SBus, if more than one SBus */

        int                     prom_node;      /* PROM device tree node for this SBus */

        char                    prom_name[64];  /* 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 sbus_bus *sbus_root;

extern __inline__ int

sbus_is_slave(struct sbus_dev *dev)

{

        /* XXX Have to write this for sun4c's */

        return 0;

}

/* Device probing routines could find these handy */

#define for_each_sbus(bus) \

        for((bus) = sbus_root; (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_root; (bus); (bus) = (bus)->next) \

                for ((device) = (bus)->devices; (device); (device) = (device)->next)

/* Driver DVMA interfaces. */

#define sbus_can_dma_64bit(sdev)        (0) /* actually, sparc_cpu_model==sun4d */

#define sbus_can_burst64(sdev)          (0) /* actually, sparc_cpu_model==sun4d */

extern void sbus_set_sbus64(struct sbus_dev *, int);

/* These yield IOMMU mappings in consistent mode. */

extern void *sbus_alloc_consistent(struct sbus_dev *, long, u32 *dma_addrp);

extern void sbus_free_consistent(struct sbus_dev *, long, void *, u32);

#define SBUS_DMA_BIDIRECTIONAL  0

#define SBUS_DMA_TODEVICE       1

#define SBUS_DMA_FROMDEVICE     2

#define SBUS_DMA_NONE           3

/* All the rest use streaming mode mappings. */

extern dma_addr_t sbus_map_single(struct sbus_dev *, void *, size_t, int);

extern void sbus_unmap_single(struct sbus_dev *, dma_addr_t, size_t, int);

extern int sbus_map_sg(struct sbus_dev *, struct scatterlist *, int, int);

extern void sbus_unmap_sg(struct sbus_dev *, struct scatterlist *, int, int);

/* Finally, allow explicit synchronization of streamable mappings. */

extern void sbus_dma_sync_single(struct sbus_dev *, dma_addr_t, size_t, int);

extern void sbus_dma_sync_sg(struct sbus_dev *, struct scatterlist *, int, int);

/* Eric Brower (ebrower@usa.net)

 * Translate SBus interrupt levels to ino values--

 * this is used when converting sbus "interrupts" OBP

 * node values to "intr" node values, and is platform

 * dependent.  If only we could call OBP with

 * "sbus-intr>cpu (sbint -- ino)" from kernel...

 * See .../drivers/sbus/sbus.c for details.

 */

BTFIXUPDEF_CALL(unsigned int, sbint_to_irq, struct sbus_dev *sdev, unsigned int)

#define sbint_to_irq(sdev, sbint) BTFIXUP_CALL(sbint_to_irq)(sdev, sbint)

#endif /* !(_SPARC_SBUS_H) */