/* Code to support devices on the DIO (and eventually DIO-II) bus * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk> *  * This code has basically these routines at the moment: * int dio_find(u_int deviceid) *    Search the list of DIO devices and return the select code *    of the next unconfigured device found that matches the given device ID. *    Note that the deviceid parameter should be the encoded ID. *    This means that framebuffers should pass it as  *    DIO_ENCODE_ID(DIO_ID_FBUFFER,DIO_ID2_TOPCAT) *    (or whatever); everybody else just uses DIO_ID_FOOBAR. * void *dio_scodetoviraddr(int scode) *    Return the virtual address corresponding to the given select code. *    NB: DIO-II devices will have to be mapped in in this routine! * int dio_scodetoipl(int scode) *    Every DIO card has a fixed interrupt priority level. This function  *    returns it, whatever it is. * const char *dio_scodetoname(int scode) *    Return a character string describing this board [might be "" if  *    not CONFIG_DIO_CONSTANTS] * void dio_config_board(int scode)     mark board as configured in the list * void dio_unconfig_board(int scode)   mark board as no longer configured * * This file is based on the way the Amiga port handles Zorro II cards,  * although we aren't so complicated... */#include <linux/config.h>#include <linux/kernel.h>#include <linux/types.h>#include <linux/dio.h>#include <linux/slab.h>                         /* kmalloc() */#include <linux/init.h>#include <asm/hwtest.h>                           /* hwreg_present() */#include <asm/io.h>                               /* readb() *//* not a real config option yet! */#define CONFIG_DIO_CONSTANTS#ifdef CONFIG_DIO_CONSTANTS/* We associate each numeric ID with an appropriate descriptive string * using a constant array of these structs. * FIXME: we should be able to arrange to throw away most of the strings * using the initdata stuff. Then we wouldn't need to worry about  * carrying them around... * I think we do this by copying them into newly kmalloc()ed memory and  * marking the names[] array as .initdata ? */struct dioname{        int id;        const char *name;};/* useful macro */#define DIONAME(x) { DIO_ID_##x, DIO_DESC_##x }#define DIOFBNAME(x) { DIO_ENCODE_ID( DIO_ID_FBUFFER, DIO_ID2_##x), DIO_DESC2_##x }static struct dioname names[] = {        DIONAME(DCA0), DIONAME(DCA0REM), DIONAME(DCA1), DIONAME(DCA1REM),        DIONAME(DCM), DIONAME(DCMREM),        DIONAME(LAN),        DIONAME(FHPIB), DIONAME(NHPIB), DIONAME(IHPIB),        DIONAME(SCSI0), DIONAME(SCSI1), DIONAME(SCSI2), DIONAME(SCSI3),        DIONAME(FBUFFER),        DIONAME(PARALLEL), DIONAME(VME), DIONAME(DCL), DIONAME(DCLREM),        DIONAME(MISC0), DIONAME(MISC1), DIONAME(MISC2), DIONAME(MISC3),        DIONAME(MISC4), DIONAME(MISC5), DIONAME(MISC6), DIONAME(MISC7),        DIONAME(MISC8), DIONAME(MISC9), DIONAME(MISC10), DIONAME(MISC11),         DIONAME(MISC12), DIONAME(MISC13),        DIOFBNAME(GATORBOX), DIOFBNAME(TOPCAT), DIOFBNAME(RENAISSANCE),        DIOFBNAME(LRCATSEYE), DIOFBNAME(HRCCATSEYE), DIOFBNAME(HRMCATSEYE),        DIOFBNAME(DAVINCI), DIOFBNAME(XXXCATSEYE), DIOFBNAME(HYPERION),        DIOFBNAME(XGENESIS), DIOFBNAME(TIGER), DIOFBNAME(YGENESIS)   };#undef DIONAME#undef DIOFBNAME#define NUMNAMES (sizeof(names) / sizeof(struct dioname))static const char *unknowndioname         = "unknown DIO board -- please email <pmaydell@chiark.greenend.org.uk>!";static const char *dio_getname(int id){        /* return pointer to a constant string describing the board with given ID */	unsigned int i;        for (i = 0; i < NUMNAMES; i++)                if (names[i].id == id)                         return names[i].name;                return unknowndioname;}#elsestatic char dio_no_name[] = { 0 };#define dio_getname(_id)	(dio_no_name)#endif /* CONFIG_DIO_CONSTANTS *//* We represent all the DIO boards in the system with a linked list of these structs. */struct dioboard{        struct dioboard *next;                    /* link to next struct in list */        int ipl;                                  /* IPL of this board */        int configured;                           /* has this board been configured? */        int scode;                                /* select code of this board */        int id;                                   /* encoded ID */        const char *name;};static struct dioboard *blist = NULL;static int __init dio_find_slow(int deviceid){	/* Called to find a DIO device before the full bus scan has run.  Basically         * only used by the console driver.         * We don't do the primary+secondary ID encoding thing here. Maybe we should.         * (that would break the topcat detection, though. I need to think about         * the whole primary/secondary ID thing.)         */	int scode;        u_char prid;	for (scode = 0; scode < DIO_SCMAX; scode++)	{		void *va;                if (DIO_SCINHOLE(scode))                        continue;                                va = dio_scodetoviraddr(scode);                if (!va || !hwreg_present(va + DIO_IDOFF))                        continue;             /* no board present at that select code */                /* We aren't very likely to want to use this to get at the IHPIB,                 * but maybe it's returning the same ID as the card we do want...                 */                if (!DIO_ISIHPIB(scode))                        prid = DIO_ID(va);                else                        prid = DIO_ID_IHPIB;		if (prid == deviceid)			return scode;	}	return 0;}/* Aargh: we use 0 for an error return code, but select code 0 exists! * FIXME (trivial, use -1, but requires changes to all the drivers :-< ) */int dio_find(int deviceid){	if (blist) 	{		/* fast way */		struct dioboard *b;		for (b = blist; b; b = b->next)			if (b->id == deviceid && b->configured == 0)				return b->scode;		return 0;	}	return dio_find_slow(deviceid);}/* This is the function that scans the DIO space and works out what * hardware is actually present. */static int __init dio_init(void){        int scode;        struct dioboard *b, *bprev = NULL;           printk("Scanning for DIO devices...\n");                for (scode = 0; scode < DIO_SCMAX; ++scode)        {                u_char prid, secid = 0;        /* primary, secondary ID bytes */                u_char *va;                                if (DIO_SCINHOLE(scode))                        continue;                                va = dio_scodetoviraddr(scode);                if (!va || !hwreg_present(va + DIO_IDOFF))                        continue;              /* no board present at that select code */                /* Found a board, allocate it an entry in the list */                b = kmalloc(sizeof(struct dioboard), GFP_KERNEL);                                /* read the ID byte(s) and encode if necessary. Note workaround                  * for broken internal HPIB devices...                 */                if (!DIO_ISIHPIB(scode))                        prid = DIO_ID(va);                else                         prid = DIO_ID_IHPIB;                                if (DIO_NEEDSSECID(prid))                {                        secid = DIO_SECID(va);                        b->id = DIO_ENCODE_ID(prid, secid);                }                else                        b->id = prid;                      b->configured = 0;                b->scode = scode;                b->ipl = DIO_IPL(va);                b->name = dio_getname(b->id);                printk("select code %3d: ipl %d: ID %02X", scode, b->ipl, prid);                if (DIO_NEEDSSECID(b->id))                        printk(":%02X", secid);                printk(": %s\n", b->name);                                b->next = NULL;                if (bprev)                        bprev->next = b;                else                        blist = b;                bprev = b;        }	return 0;}subsys_initcall(dio_init);/* Bear in mind that this is called in the very early stages of initialisation * in order to get the virtual address of the serial port for the console... */void *dio_scodetoviraddr(int scode){        if (scode > DIOII_SCBASE)        {                printk("dio_scodetoviraddr: don't support DIO-II yet!\n");                return 0;        }        else if (scode > DIO_SCMAX || scode < 0)                return 0;        else if (DIO_SCINHOLE(scode))                return 0;        else if (DIO_ISIHPIB(scode))                return (void*)DIO_IHPIBADDR;        return (void*)(DIO_VIRADDRBASE + DIO_BASE + scode * 0x10000);}int dio_scodetoipl(int scode){        struct dioboard *b;        for (b = blist; b; b = b->next)                if (b->scode == scode)                         break;                if (!b)        {                printk("dio_scodetoipl: bad select code %d\n", scode);                return 0;        }        else                return b->ipl;}const char *dio_scodetoname(int scode){        struct dioboard *b;        for (b = blist; b; b = b->next)                if (b->scode == scode)                         break;                if (!b)        {                printk("dio_scodetoname: bad select code %d\n", scode);                return NULL;        }        else                return b->name;}void dio_config_board(int scode){        struct dioboard *b;        for (b = blist; b; b = b->next)                if (b->scode == scode)                        break;           if (!b)                 printk("dio_config_board: bad select code %d\n", scode);        else if (b->configured)                printk("dio_config_board: board at select code %d already configured\n", scode);        else                b->configured = 1;}void dio_unconfig_board(int scode){        struct dioboard *b;        for (b = blist; b; b = b->next)                if (b->scode == scode)                         break;           if (!b)                 printk("dio_unconfig_board: bad select code %d\n", scode);        else if (!b->configured)                printk("dio_unconfig_board: board at select code %d not configured\n", 		       scode);        else                 b->configured = 0;}