tc.h

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/*
 *  Interface to the TURBOchannel related routines.
 *
 *  Copyright (c) 1998  Harald Koerfgen
 *  Copyright (c) 2005  James Simmons
 *  Copyright (c) 2006  Maciej W. Rozycki
 *
 *  Based on:
 *
 *  "TURBOchannel Firmware Specification", EK-TCAAD-FS-004
 *
 *  from Digital Equipment Corporation.
 *
 *  This file is subject to the terms and conditions of the GNU
 *  General Public License.  See the file "COPYING" in the main
 *  directory of this archive for more details.
 */
#ifndef _LINUX_TC_H
#define _LINUX_TC_H

#include <linux/compiler.h>
#include <linux/device.h>
#include <linux/ioport.h>
#include <linux/types.h>

/*
 * Offsets for the ROM header locations for TURBOchannel cards.
 */
#define TC_OLDCARD  0x3c0000
#define TC_NEWCARD  0x000000

#define TC_ROM_WIDTH    0x3e0
#define TC_ROM_STRIDE   0x3e4
#define TC_ROM_SIZE 0x3e8
#define TC_SLOT_SIZE    0x3ec
#define TC_PATTERN0 0x3f0
#define TC_PATTERN1 0x3f4
#define TC_PATTERN2 0x3f8
#define TC_PATTERN3 0x3fc
#define TC_FIRM_VER 0x400
#define TC_VENDOR   0x420
#define TC_MODULE   0x440
#define TC_FIRM_TYPE    0x460
#define TC_FLAGS    0x470
#define TC_ROM_OBJECTS  0x480

/*
 * Information obtained through the get_tcinfo() PROM call.
 */
struct tcinfo {
    s32     revision;   /* Hardware revision level. */
    s32     clk_period; /* Clock period in nanoseconds. */
    s32     slot_size;  /* Slot size in megabytes. */
    s32     io_timeout; /* I/O timeout in cycles. */
    s32     dma_range;  /* DMA address range in megabytes. */
    s32     max_dma_burst;  /* Maximum DMA burst length. */
    s32     parity;     /* System module supports TC parity. */
    s32     reserved[4];
};

/*
 * TURBOchannel bus.
 */
struct tc_bus {
    struct list_head devices;   /* List of devices on this bus. */
    struct resource resource[2];    /* Address space routed to this bus. */

    struct device   dev;
    char        name[13];
    resource_size_t slot_base;
    resource_size_t ext_slot_base;
    resource_size_t ext_slot_size;
    int     num_tcslots;
    struct tcinfo   info;
};

/*
 * TURBOchannel device.
 */
struct tc_dev {
    struct list_head node;      /* Node in list of all TC devices. */
    struct tc_bus   *bus;       /* Bus this device is on. */
    struct tc_driver *driver;   /* Which driver has allocated this
                       device. */
    struct device   dev;        /* Generic device interface. */
    struct resource resource;   /* Address space of this device. */
    char        vendor[9];
    char        name[9];
    char        firmware[9];
    int     interrupt;
    int     slot;
};

#define to_tc_dev(n) container_of(n, struct tc_dev, dev)

struct tc_device_id {
    char        vendor[9];
    char        name[9];
};

/*
 * TURBOchannel driver.
 */
struct tc_driver {
    struct list_head node;
    const struct tc_device_id *id_table;
    struct device_driver driver;
};

#define to_tc_driver(drv) container_of(drv, struct tc_driver, driver)

/*
 * Return TURBOchannel clock frequency in Hz.
 */
static inline unsigned long tc_get_speed(struct tc_bus *tbus)
{
    return 100000 * (10000 / (unsigned long)tbus->info.clk_period);
}

#ifdef CONFIG_TC

extern struct bus_type tc_bus_type;

extern int tc_register_driver(struct tc_driver *tdrv);
extern void tc_unregister_driver(struct tc_driver *tdrv);

#else /* !CONFIG_TC */

static inline int tc_register_driver(struct tc_driver *tdrv) { return 0; }
static inline void tc_unregister_driver(struct tc_driver *tdrv) { }

#endif /* CONFIG_TC */

/*
 * These have to be provided by the architecture.
 */
extern int tc_preadb(u8 *valp, void __iomem *addr);
extern int tc_bus_get_info(struct tc_bus *tbus);
extern void tc_device_get_irq(struct tc_dev *tdev);

#endif /* _LINUX_TC_H */