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/* 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>
/* 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;
}
#else
static 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.
*/
void __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;
}
}
/* 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;
}