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|
/* $OpenBSD: nubus.c,v 1.9 1997/03/12 13:15:58 briggs Exp $ */
/* $NetBSD: nubus.c,v 1.32 1997/02/28 07:54:02 scottr Exp $ */
/*
* Copyright (c) 1995, 1996 Allen Briggs. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Allen Briggs.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/dmap.h>
#include <vm/vm.h>
#include <vm/vm_kern.h>
#include <vm/vm_map.h>
#include <machine/autoconf.h>
#include <machine/bus.h>
#include <machine/vmparam.h>
#include <machine/param.h>
#include <machine/cpu.h>
#include <machine/pte.h>
#include <machine/viareg.h>
#include "nubus.h"
#ifdef DEBUG
static int nubus_debug = 0x01;
#define NDB_PROBE 0x1
#define NDB_FOLLOW 0x2
#define NDB_ARITH 0x4
#endif
static int nubus_print __P((void *, const char *));
static int nubus_match __P((struct device *, void *, void *));
static void nubus_attach __P((struct device *, struct device *, void *));
int nubus_video_resource __P((int));
static int probe_slot __P((int slot, nubus_slot *fmt));
static u_long IncPtr __P((nubus_slot *fmt, u_long base, long amt));
static u_long nubus_calc_CRC __P((nubus_slot *fmt));
static u_char GetByte __P((nubus_slot *fmt, u_long ptr));
#ifdef notyet
/* unused */ static u_short GetWord __P((nubus_slot *fmt, u_long ptr));
#endif
static u_long GetLong __P((nubus_slot *fmt, u_long ptr));
static int nubus_peek __P((vm_offset_t, int));
struct cfattach nubus_ca = {
sizeof(struct nubus_softc), nubus_match, nubus_attach
};
struct cfdriver nubus_cd = {
NULL, "nubus", DV_DULL,
};
static int
nubus_match(parent, vcf, aux)
struct device *parent;
void *vcf;
void *aux;
{
static int nubus_matched = 0;
/* Allow only one instance. */
if (nubus_matched)
return (0);
nubus_matched = 1;
return (1);
}
static void
nubus_attach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct nubus_attach_args na_args;
nubus_slot fmtblock;
nubus_dir dir;
nubus_dirent dirent;
nubus_type slottype;
int i, rsrcid;
printf("\n");
for (i = NUBUS_MIN_SLOT; i <= NUBUS_MAX_SLOT; i++) {
if (probe_slot(i, &fmtblock) <= 0)
continue;
if ((rsrcid = nubus_video_resource(i)) == (-1))
rsrcid = 0x80;
nubus_get_main_dir(&fmtblock, &dir);
if (nubus_find_rsrc(&fmtblock, &dir, rsrcid, &dirent) <= 0)
continue;
nubus_get_dir_from_rsrc(&fmtblock, &dirent, &dir);
if (nubus_find_rsrc(&fmtblock, &dir, NUBUS_RSRC_TYPE,
&dirent) <= 0)
continue;
if (nubus_get_ind_data(&fmtblock, &dirent,
(caddr_t) &slottype, sizeof(nubus_type)) <= 0)
continue;
na_args.slot = i;
na_args.rsrcid = rsrcid;
na_args.category = slottype.category;
na_args.type = slottype.type;
na_args.drsw = slottype.drsw;
na_args.drhw = slottype.drhw;
na_args.fmt = &fmtblock;
config_found(self, &na_args, nubus_print);
}
/*
* enable nubus interrupts here.
*/
enable_nubus_intr();
}
static int
nubus_print(aux, name)
void *aux;
const char *name;
{
struct nubus_attach_args *na = (struct nubus_attach_args *) aux;
if (name) {
printf("%s: slot %x: %s ", name, na->fmt->slot,
nubus_get_card_name(na->fmt));
printf("(Vendor: %s, ",
nubus_get_vendor(na->fmt, NUBUS_RSRC_VEND_ID));
printf("Part: %s)",
nubus_get_vendor(na->fmt, NUBUS_RSRC_VEND_PART));
}
return (UNCONF);
}
int
nubus_video_resource(slot)
int slot;
{
extern u_int16_t mac68k_vrsrc_vec[];
int i;
for (i = 0 ; i < 6 ; i++)
if ((mac68k_vrsrc_vec[i] & 0xff) == slot)
return ((mac68k_vrsrc_vec[i] >> 8) & 0xff);
return (-1);
}
/*
* Probe a given nubus slot. If a card is there and we can get the
* format block from it's clutching decl. ROMs, fill the format block
* and return non-zero. If we can't find a card there with a valid
* decl. ROM, return 0.
*
* First, we check to see if we can access the memory at the tail
* end of the slot. If so, then we check for a bytelanes byte. We
* could probably just return a failure status if we bus error on
* the first try, but there really is little reason not to go ahead
* and check the other three locations in case there's a wierd card
* out there.
*
* Checking for a card involves locating the "bytelanes" byte which
* tells us how to interpret the declaration ROM's data. The format
* block is at the top of the card's standard memory space and the
* bytelanes byte is at the end of that block.
*
* After some inspection of the bytelanes byte, it appears that it
* takes the form 0xXY where Y is a bitmask of the bytelanes in use
* and X is a bitmask of the lanes to ignore. Hence, (X ^ Y) == 0
* and (less obviously), Y will have the upper N bits clear if it is
* found N bytes from the last possible location. Both that and
* the exclusive-or check are made.
*
* If a valid
*/
static u_char nbits[]={0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4};
static int
probe_slot(slot, fmt)
int slot;
nubus_slot *fmt;
{
caddr_t rom_probe;
vm_offset_t hdr;
#ifdef DEBUG
vm_offset_t pa;
#endif
u_int data;
int hdr_size, i;
fmt->bytelanes = 0;
fmt->slot = (u_long)slot;
rom_probe = (caddr_t) (NUBUS_SLOT2PA(fmt->slot) + NBMEMSIZE);
#ifdef DEBUG
if (nubus_debug & NDB_PROBE) {
pa = pmap_extract(pmap_kernel(), (vm_offset_t) rom_probe - 1);
printf("probing slot %d, first probe at %p (PA %lx).\n",
slot, rom_probe - 1, pa);
}
#endif
for (i = 4; i && (fmt->bytelanes == 0); i--) {
rom_probe--;
data = nubus_peek((vm_offset_t) rom_probe, 1);
if (data == (u_int) -1)
continue;
if (data == 0)
continue;
if ( ((((data & 0xf0) >> 4) ^ (data & 0x0f)) == 0x0f)
&& ((data & 0x0f) < (1 << i)) ) {
fmt->bytelanes = data;
fmt->step = nbits[(data & 0x0f)];
}
}
#ifdef DEBUG
if (nubus_debug & NDB_PROBE)
if (fmt->bytelanes == 0)
printf("bytelanes not found for slot 0x%x.\n", slot);
#endif
if (fmt->bytelanes == 0)
return 0;
#ifdef DEBUG
if (nubus_debug & NDB_PROBE)
printf("bytelanes of 0x%x found for slot 0x%x.\n",
fmt->bytelanes, slot);
#endif
hdr_size = 20;
/*
* Go ahead and attempt to load format header.
* First, we need to find the first byte beyond memory that
* would be valid. This is necessary for NUBUS_ROM_offset()
* to work.
*/
hdr = (vm_offset_t)
nubus_mapin(NUBUS_SLOT2PA(fmt->slot), NBMEMSIZE);
if (hdr == NULL) {
printf("Failed to map %d bytes for NuBUS slot %d probe. ",
NBMEMSIZE, fmt->slot);
printf("Physical slot address %x\n",
(unsigned int) NUBUS_SLOT2PA(fmt->slot));
}
fmt->virtual_base = hdr;
hdr += NBMEMSIZE;
i = 0x10 | (fmt->bytelanes & 0x0f);
while ((i & 1) == 0) {
hdr++;
i >>= 1;
}
fmt->top = hdr;
hdr = IncPtr(fmt, hdr, -hdr_size);
#ifdef DEBUG
if (nubus_debug & NDB_PROBE)
printf("fmt->top is 0x%lx, that minus 0x%x puts us at 0x%lx.\n",
fmt->top, hdr_size, hdr);
#if 0
for (i=1 ; i < 8 ; i++) {
printf("0x%x - 0x%x = 0x%x, + 0x%x = 0x%x.\n",
hdr, i, IncPtr(fmt, hdr, -i),
i, IncPtr(fmt, hdr, i));
}
#endif
#endif
fmt->directory_offset = 0xff000000 | GetLong(fmt, hdr);
hdr = IncPtr(fmt, hdr, 4);
fmt->length = GetLong(fmt, hdr);
hdr = IncPtr(fmt, hdr, 4);
fmt->crc = GetLong(fmt, hdr);
hdr = IncPtr(fmt, hdr, 4);
fmt->revision_level = GetByte(fmt, hdr);
hdr = IncPtr(fmt, hdr, 1);
fmt->format = GetByte(fmt, hdr);
hdr = IncPtr(fmt, hdr, 1);
fmt->test_pattern = GetLong(fmt, hdr);
#ifdef DEBUG
if (nubus_debug & NDB_PROBE) {
printf("Directory offset 0x%x\t", fmt->directory_offset);
printf("Length 0x%x\t", fmt->length);
printf("CRC 0x%x\n", fmt->crc);
printf("Revision level 0x%x\t", fmt->revision_level);
printf("Format 0x%x\t", fmt->format);
printf("Test Pattern 0x%x\n", fmt->test_pattern);
}
#endif
if ((fmt->directory_offset & 0x00ff0000) == 0) {
printf("Invalid looking directory offset (0x%x)!\n",
fmt->directory_offset);
return 0;
}
if (fmt->test_pattern != NUBUS_ROM_TEST_PATTERN) {
printf("Nubus--test pattern invalid:\n");
printf(" slot 0x%x, bytelanes 0x%x?\n",
fmt->slot, fmt->bytelanes);
printf(" read test 0x%x, compare with 0x%x.\n",
fmt->test_pattern, NUBUS_ROM_TEST_PATTERN);
return 0;
}
/* Perform CRC */
if (fmt->crc != nubus_calc_CRC(fmt)) {
printf("Nubus--crc check failed, slot 0x%x.\n",
fmt->slot);
return 0;
}
return 1;
}
/*
* Compute byte offset on card, taking into account bytelanes.
* Base must be on a valid bytelane for this function to work.
* Return the new address.
*
* XXX -- There has GOT to be a better way to do this.
*/
static u_long
IncPtr(fmt, base, amt)
nubus_slot *fmt;
u_long base;
long amt;
{
u_char b, t;
if (!amt)
return base;
if (amt < 0) {
amt = -amt;
b = fmt->bytelanes;
t = (b << 4);
b <<= (3 - (base & 0x3));
while (amt) {
b <<= 1;
if (b == t)
b = fmt->bytelanes;
if (b & 0x08)
amt--;
base--;
}
return base;
}
t = (fmt->bytelanes & 0xf) | 0x10;
b = t >> (base & 0x3);
while (amt) {
b >>= 1;
if (b == 1)
b = t;
if (b & 1)
amt--;
base++;
}
return base;
}
static u_long
nubus_calc_CRC(fmt)
nubus_slot *fmt;
{
#if 0
u_long base, ptr, crc_loc, sum;
int i;
base = fmt->top;
crc_loc = NUBUS_ROM_offset(fmt, base, -12);
ptr = NUBUS_ROM_offset(fmt, base, -fmt->length);
sum = 0;
while (ptr < base)
roll #1, sum
if (ptr == crc_loc) {
roll #3, sum
ptr = IncPtr(fmt, ptr, 3);
} else {
sum += GetByte(fmt, ptr);
}
ptr = IncPtr(fmt, ptr, 1);
}
return sum;
#endif
return fmt->crc;
}
static u_char
GetByte(fmt, ptr)
nubus_slot *fmt;
u_long ptr;
{
return *(caddr_t)ptr;
}
#ifdef notyet
/* Nothing uses this, yet */
static u_short
GetWord(fmt, ptr)
nubus_slot *fmt;
u_long ptr;
{
u_short s;
s = (GetByte(fmt, ptr) << 8);
ptr = IncPtr(fmt, ptr, 1);
s |= GetByte(fmt, ptr);
return s;
}
#endif
static u_long
GetLong(fmt, ptr)
nubus_slot *fmt;
u_long ptr;
{
register u_long l;
register int i;
l = 0;
for ( i = 0; i < 4; i++) {
l = (l << 8) | GetByte(fmt, ptr);
ptr = IncPtr(fmt, ptr, 1);
}
return l;
}
void
nubus_get_main_dir(slot, dir_return)
nubus_slot *slot;
nubus_dir *dir_return;
{
#ifdef DEBUG
if (nubus_debug & NDB_FOLLOW)
printf("nubus_get_main_dir(0x%x, 0x%x)\n",
(u_int) slot, (u_int) dir_return);
#endif
dir_return->dirbase = IncPtr(slot, slot->top,
slot->directory_offset - 20);
dir_return->curr_ent = dir_return->dirbase;
}
int
nubus_find_rsrc(slot, dir, rsrcid, dirent_return)
nubus_slot *slot;
nubus_dir *dir;
u_int8_t rsrcid;
nubus_dirent *dirent_return;
{
u_long entry;
u_char byte;
#ifdef DEBUG
if (nubus_debug & NDB_FOLLOW)
printf("nubus_find_rsrc(0x%x, 0x%x, 0x%x, 0x%x)\n",
(u_int) slot, (u_int) dir, (u_int) rsrcid,
(u_int) dirent_return);
#endif
if (slot->test_pattern != NUBUS_ROM_TEST_PATTERN)
return -1;
entry = dir->curr_ent;
do {
byte = GetByte(slot, entry);
#ifdef DEBUG
if (nubus_debug & NDB_FOLLOW)
printf("\tFound rsrc 0x%x.\n", byte);
#endif
if (byte == rsrcid) {
dirent_return->myloc = entry;
dirent_return->rsrc_id = rsrcid;
entry = GetLong(slot, entry);
dirent_return->offset = (entry & 0x00ffffff);
return 1;
}
if (byte == 0xff) {
entry = dir->dirbase;
} else {
entry = IncPtr(slot, entry, 4);
}
} while (entry != (u_long) dir->curr_ent);
return 0;
}
void
nubus_get_dir_from_rsrc(slot, dirent, dir_return)
nubus_slot *slot;
nubus_dirent *dirent;
nubus_dir *dir_return;
{
u_long loc;
#ifdef DEBUG
if (nubus_debug & NDB_FOLLOW)
printf("nubus_get_dir_from_rsrc(0x%x, 0x%x, 0x%x).\n",
(u_int) slot, (u_int) dirent, (u_int) dir_return);
#endif
if ((loc = dirent->offset) & 0x800000) {
loc |= 0xff000000;
}
dir_return->dirbase = IncPtr(slot, dirent->myloc, loc);
dir_return->curr_ent = dir_return->dirbase;
}
int
nubus_get_ind_data(slot, dirent, data_return, nbytes)
nubus_slot *slot;
nubus_dirent *dirent;
caddr_t data_return;
int nbytes;
{
u_long loc;
#ifdef DEBUG
if (nubus_debug & NDB_FOLLOW)
printf("nubus_get_ind_data(0x%x, 0x%x, 0x%x, %d).\n",
(u_int) slot, (u_int) dirent, (u_int) data_return,
nbytes);
#endif
if ((loc = dirent->offset) & 0x800000) {
loc |= 0xff000000;
}
loc = IncPtr(slot, dirent->myloc, loc);
while (nbytes--) {
*data_return++ = GetByte(slot, loc);
loc = IncPtr(slot, loc, 1);
}
return 1;
}
int
nubus_get_c_string(slot, dirent, data_return, max_bytes)
nubus_slot *slot;
nubus_dirent *dirent;
caddr_t data_return;
int max_bytes;
{
u_long loc;
#ifdef DEBUG
if (nubus_debug & NDB_FOLLOW)
printf("nubus_get_c_string(0x%x, 0x%x, 0x%x, %d).\n",
(u_int) slot, (u_int) dirent, (u_int) data_return,
max_bytes);
#endif
if ((loc = dirent->offset) & 0x800000) {
loc |= 0xff000000;
}
loc = IncPtr(slot, dirent->myloc, loc);
*data_return = '\0';
while (max_bytes--) {
if ((*data_return++ = GetByte(slot, loc)) == 0)
return 1;
loc = IncPtr(slot, loc, 1);
}
return 0;
}
static char *huh = "???";
char *
nubus_get_vendor(slot, rsrc)
nubus_slot *slot;
int rsrc;
{
static char str_ret[64];
nubus_dir dir;
nubus_dirent ent;
#ifdef DEBUG
if (nubus_debug & NDB_FOLLOW)
printf("nubus_get_vendor(0x%x, 0x%x).\n", (u_int) slot, rsrc);
#endif
nubus_get_main_dir(slot, &dir);
if (nubus_find_rsrc(slot, &dir, 1, &ent) <= 0)
return huh;
nubus_get_dir_from_rsrc(slot, &ent, &dir);
if (nubus_find_rsrc(slot, &dir, NUBUS_RSRC_VENDORINFO, &ent) <= 0)
return huh;
nubus_get_dir_from_rsrc(slot, &ent, &dir);
if (nubus_find_rsrc(slot, &dir, rsrc, &ent) <= 0)
return huh;
nubus_get_c_string(slot, &ent, str_ret, 64);
return str_ret;
}
char *
nubus_get_card_name(slot)
nubus_slot *slot;
{
static char name_ret[64];
nubus_dir dir;
nubus_dirent ent;
#ifdef DEBUG
if (nubus_debug & NDB_FOLLOW)
printf("nubus_get_card_name(0x%lx).\n", (u_long) slot);
#endif
nubus_get_main_dir(slot, &dir);
if (nubus_find_rsrc(slot, &dir, 1, &ent) <= 0)
return huh;
nubus_get_dir_from_rsrc(slot, &ent, &dir);
if (nubus_find_rsrc(slot, &dir, NUBUS_RSRC_NAME, &ent) <= 0)
return huh;
nubus_get_c_string(slot, &ent, name_ret, 64);
return name_ret;
}
/*
* bus_*() functions adapted from sun3 generic "bus" support
* by Allen Briggs.
*/
vm_offset_t tmp_vpages[1];
/*
* Read addr with size len (1,2,4) into val.
* If this generates a bus error, return -1
*
* Create a temporary mapping,
* Try the access using peek_*
* Clean up temp. mapping
*/
static int
nubus_peek(paddr, sz)
vm_offset_t paddr;
int sz;
{
int off, pte, rv;
vm_offset_t pgva;
caddr_t va;
off = paddr & PGOFSET;
paddr -= off;
pte = (paddr & PG_FRAME) | (PG_V | PG_W | PG_CI);
pgva = tmp_vpages[0];
va = (caddr_t)pgva + off;
mac68k_set_pte(pgva, pte);
TBIS(pgva);
/*
* OK, try the access using one of the assembly routines
* that will set pcb_onfault and catch any bus errors.
*/
rv = -1;
switch (sz) {
case 1:
if (!badbaddr(va))
rv = *((u_char *) va);
break;
case 2:
if (!badwaddr(va))
rv = *((u_int16_t *) va);
break;
case 4:
if (!badladdr(va))
rv = *((u_int32_t *) va);
break;
default:
printf("bus_peek: invalid size=%d\n", sz);
rv = -1;
}
mac68k_set_pte(pgva, PG_NV);
TBIS(pgva);
return rv;
}
char *
nubus_mapin(paddr, sz)
int paddr, sz;
{
int off, pa, pmt=0;
vm_offset_t va, retval;
off = paddr & PGOFSET;
pa = paddr - off;
sz += off;
sz = mac68k_round_page(sz);
/* Get some kernel virtual address space. */
va = kmem_alloc_wait(kernel_map, sz);
if (va == 0)
panic("bus_mapin");
retval = va + off;
/* Map it to the specified bus. */
#if 0 /* XXX */
/* This has a problem with wrap-around... */
pmap_map((int)va, pa | pmt, pa + sz, VM_PROT_ALL);
#else
do {
pmap_enter(pmap_kernel(), va, pa | pmt, VM_PROT_ALL, FALSE);
va += NBPG;
pa += NBPG;
} while ((sz -= NBPG) > 0);
#endif
return ((char*)retval);
}
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