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/*
* tc-init: We assume the TURBOchannel to be up and running so
* just probe for Modules and fill in the global data structure
* tc_bus.
*
* 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.
*
* Copyright (c) Harald Koerfgen, 1998
*/
#include <linux/string.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <asm/addrspace.h>
#include <asm/errno.h>
#include <asm/dec/machtype.h>
#include <asm/dec/tcinfo.h>
#include <asm/dec/tcmodule.h>
#include <asm/dec/interrupts.h>
#include <asm/ptrace.h>
#include <linux/kernel.h>
#include <linux/module.h>
#define TC_DEBUG
MODULE_LICENSE("GPL");
slot_info tc_bus[MAX_SLOT];
static int max_tcslot;
static tcinfo *info;
unsigned long system_base;
extern void (*dbe_board_handler)(struct pt_regs *regs);
extern unsigned long *(*rex_slot_address)(int);
extern void *(*rex_gettcinfo)(void);
/*
* Interface to the world. Read comment in include/asm-mips/tc.h.
*/
int search_tc_card(char *name)
{
int slot;
slot_info *sip;
for (slot = 0; slot <= max_tcslot; slot++) {
sip = &tc_bus[slot];
if ((sip->flags & FREE) && (strncmp(sip->name, name, strlen(name)) == 0)) {
return slot;
}
}
return -ENODEV;
}
void claim_tc_card(int slot)
{
if (tc_bus[slot].flags & IN_USE) {
printk("claim_tc_card: attempting to claim a card already in use\n");
return;
}
tc_bus[slot].flags &= ~FREE;
tc_bus[slot].flags |= IN_USE;
}
void release_tc_card(int slot)
{
if (tc_bus[slot].flags & FREE) {
printk("release_tc_card: attempting to release a card already free\n");
return;
}
tc_bus[slot].flags &= ~IN_USE;
tc_bus[slot].flags |= FREE;
}
unsigned long get_tc_base_addr(int slot)
{
return tc_bus[slot].base_addr;
}
unsigned long get_tc_irq_nr(int slot)
{
return tc_bus[slot].interrupt;
}
unsigned long get_tc_speed(void)
{
return 100000 * (10000 / (unsigned long)info->clk_period);
}
/*
* Probing for TURBOchannel modules
*/
static void __init my_dbe_handler(struct pt_regs *regs)
{
regs->cp0_epc += 4;
}
static void __init tc_probe(unsigned long startaddr, unsigned long size, int max_slot)
{
int i, slot;
long offset;
unsigned char *module;
void (*old_be_handler)(struct pt_regs *regs);
/* Install our exception handler temporarily */
old_be_handler = dbe_board_handler;
dbe_board_handler = my_dbe_handler;
for (slot = 0; slot <= max_slot; slot++) {
module = (char *)(startaddr + slot * size);
offset = -1;
if (module[OLDCARD + TC_PATTERN0] == 0x55 && module[OLDCARD + TC_PATTERN1] == 0x00
&& module[OLDCARD + TC_PATTERN2] == 0xaa && module[OLDCARD + TC_PATTERN3] == 0xff)
offset = OLDCARD;
if (module[TC_PATTERN0] == 0x55 && module[TC_PATTERN1] == 0x00
&& module[TC_PATTERN2] == 0xaa && module[TC_PATTERN3] == 0xff)
offset = 0;
if (offset != -1) {
tc_bus[slot].base_addr = (unsigned long)module;
for(i = 0; i < 8; i++) {
tc_bus[slot].firmware[i] = module[TC_FIRM_VER + offset + 4 * i];
tc_bus[slot].vendor[i] = module[TC_VENDOR + offset + 4 * i];
tc_bus[slot].name[i] = module[TC_MODULE + offset + 4 * i];
}
tc_bus[slot].firmware[8] = 0;
tc_bus[slot].vendor[8] = 0;
tc_bus[slot].name[8] = 0;
/*
* Looks unneccesary, but we may change
* TC? in the future
*/
switch (slot) {
case 0:
tc_bus[slot].interrupt = TC0;
break;
case 1:
tc_bus[slot].interrupt = TC1;
break;
case 2:
tc_bus[slot].interrupt = TC2;
break;
/*
* Yuck! DS5000/200 onboard devices
*/
case 5:
tc_bus[slot].interrupt = SCSI_INT;
break;
case 6:
tc_bus[slot].interrupt = ETHER;
break;
default:
tc_bus[slot].interrupt = -1;
break;
}
}
}
dbe_board_handler = old_be_handler;
}
/*
* the main entry
*/
void __init tc_init(void)
{
int tc_clock;
int i;
unsigned long slot0addr;
unsigned long slot_size;
if (!TURBOCHANNEL)
return;
for (i = 0; i < MAX_SLOT; i++) {
tc_bus[i].base_addr = 0;
tc_bus[i].name[0] = 0;
tc_bus[i].vendor[0] = 0;
tc_bus[i].firmware[0] = 0;
tc_bus[i].interrupt = -1;
tc_bus[i].flags = FREE;
}
info = (tcinfo *) rex_gettcinfo();
slot0addr = (unsigned long)KSEG1ADDR(rex_slot_address(0));
switch (mips_machtype) {
case MACH_DS5000_200:
max_tcslot = 6;
break;
case MACH_DS5000_1XX:
case MACH_DS5000_2X0:
max_tcslot = 2;
break;
case MACH_DS5000_XX:
default:
max_tcslot = 1;
break;
}
tc_clock = 10000 / info->clk_period;
if (TURBOCHANNEL && info->slot_size && slot0addr) {
printk("TURBOchannel rev. %1d at %2d.%1d MHz ", info->revision,
tc_clock / 10, tc_clock % 10);
printk("(with%s parity)\n", info->parity ? "" : "out");
slot_size = info->slot_size << 20;
tc_probe(slot0addr, slot_size, max_tcslot);
/*
* All TURBOchannel DECstations have the onboard devices
* where the (max_tcslot + 1 or 2 on DS5k/xx) Option Module
* would be.
*/
if(mips_machtype == MACH_DS5000_XX)
i = 2;
else
i = 1;
system_base = slot0addr + slot_size * (max_tcslot + i);
#ifdef TC_DEBUG
for (i = 0; i <= max_tcslot; i++)
if (tc_bus[i].base_addr) {
printk(" slot %d: ", i);
printk("%s %s %s\n", tc_bus[i].vendor,
tc_bus[i].name, tc_bus[i].firmware);
}
#endif
ioport_resource.end = KSEG2 - 1;
}
}
EXPORT_SYMBOL(search_tc_card);
EXPORT_SYMBOL(claim_tc_card);
EXPORT_SYMBOL(release_tc_card);
EXPORT_SYMBOL(get_tc_base_addr);
EXPORT_SYMBOL(get_tc_irq_nr);
EXPORT_SYMBOL(get_tc_speed);
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