/* Copyright (C) 1999,2001
*
* Author: J.E.J.Bottomley@HansenPartnership.com
*
* linux/arch/i386/kernel/voyager.c
*
* This file contains all the voyager specific routines for getting
* initialisation of the architecture to function. For additional
* features see:
*
* voyager_cat.c - Voyager CAT bus interface
* voyager_smp.c - Voyager SMP hal (emulates linux smp.c)
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/sysrq.h>
#include <asm/io.h>
#include <asm/voyager.h>
#include <asm/vic.h>
#include <linux/pm.h>
#include <linux/irq.h>
#include <asm/tlbflush.h>
#include <asm/arch_hooks.h>
#include <asm/i8253.h>
/*
* Power off function, if any
*/
void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);
int voyager_level = 0;
struct voyager_SUS *voyager_SUS = NULL;
#ifdef CONFIG_SMP
static void
voyager_dump(int dummy1, struct pt_regs *dummy2, struct tty_struct *dummy3)
{
/* get here via a sysrq */
voyager_smp_dump();
}
static struct sysrq_key_op sysrq_voyager_dump_op = {
.handler = voyager_dump,
.help_msg = "Voyager",
.action_msg = "Dump Voyager Status",
};
#endif
void
voyager_detect(struct voyager_bios_info *bios)
{
if(bios->len != 0xff) {
int class = (bios->class_1 << 8)
| (bios->class_2 & 0xff);
printk("Voyager System detected.\n"
" Class %x, Revision %d.%d\n",
class, bios->major, bios->minor);
if(class == VOYAGER_LEVEL4)
voyager_level = 4;
else if(class < VOYAGER_LEVEL5_AND_ABOVE)
voyager_level = 3;
else
voyager_level = 5;
printk(" Architecture Level %d\n", voyager_level);
if(voyager_level < 4)
printk("\n**WARNING**: Voyager HAL only supports Levels 4 and 5 Architectures at the moment\n\n");
/* install the power off handler */
pm_power_off = voyager_power_off;
#ifdef CONFIG_SMP
register_sysrq_key('v', &sysrq_voyager_dump_op);
#endif
} else {
printk("\n\n**WARNING**: No Voyager Subsystem Found\n");
}
}
void
voyager_system_interrupt(int cpl, void *dev_id, struct pt_regs *regs)
{
printk("Voyager: detected system interrupt\n");
}
/* Routine to read information from the extended CMOS area */
__u8
voyager_extended_cmos_read(__u16 addr)
{
outb(addr & 0xff, 0x74);
outb((addr >> 8) & 0xff, 0x75);
return inb(0x76);
}
/* internal definitions for the SUS Click Map of memory */
#define CLICK_ENTRIES 16
#define CLICK_SIZE 4096 /* click to byte conversion for Length */
typedef struct ClickMap {
struct Entry {
__u32 Address;
__u32 Length;
} Entry[CLICK_ENTRIES];
} ClickMap_t;
/* This routine is pretty much an awful hack to read the bios clickmap by
* mapping it into page 0. There are usually three regions in the map:
* Base Memory
* Extended Memory
* zero length marker for end of map
*
* Returns are 0 for failure and 1 for success on extracting region.
*/
int __init
voyager_memory_detect(int region, __u32 *start, __u32 *length)
{
int i;
int retval = 0;
__u8 cmos[4];
ClickMap_t *map;
unsigned long map_addr;
unsigned long old;
if(region >= CLICK_ENTRIES) {
printk("Voyager: Illegal ClickMap region %d\n", region);
return 0;
}
for(i = 0; i < sizeof(cmos); i++)
cmos[i] = voyager_extended_cmos_read(VOYAGER_MEMORY_CLICKMAP + i);
map_addr = *(unsigned long *)cmos;
/* steal page 0 for this */
old = pg0[0];
pg0[0] = ((map_addr & PAGE_MASK) | _PAGE_RW | _PAGE_PRESENT);
local_flush_tlb();
/* now clear everything out but page 0 */
map = (ClickMap_t *)(map_addr & (~PAGE_MASK));
/* zero length is the end of the clickmap */
if(map->Entry[region].Length != 0) {
*length = map->Entry[region].Length * CLICK_SIZE;
*start = map->Entry[region].Address;
retval = 1;
}
/* replace the mapping */
pg0[0] = old;
local_flush_tlb();
return retval;
}
/* voyager specific handling code for timer interrupts. Used to hand
* off the timer tick to the SMP code, since the VIC doesn't have an
* internal timer (The QIC does, but that's another story). */
void
voyager_timer_interrupt(struct pt_regs *regs)
{
if((jiffies & 0x3ff) == 0) {
/* There seems to be something flaky in either
* hardware or software that is resetting the timer 0
* count to something much higher than it should be
* This seems to occur in the boot sequence, just
* before root is mounted. Therefore, every 10
* seconds or so, we sanity check the timer zero count
* and kick it back to where it should be.
*
* FIXME: This is the most awful hack yet seen. I
* should work out exactly what is interfering with
* the timer count settings early in the boot sequence
* and swiftly introduce it to something sharp and
* pointy. */
__u16 val;
spin_lock(&i8253_lock);
outb_p(0x00, 0x43);
val = inb_p(0x40);
val |= inb(0x40) << 8;
spin_unlock(&i8253_lock);
if(val > LATCH) {
printk("\nVOYAGER: countdown timer value too high (%d), resetting\n\n", val);
spin_lock(&i8253_lock);
outb(0x34,0x43);
outb_p(LATCH & 0xff , 0x40); /* LSB */
outb(LATCH >> 8 , 0x40); /* MSB */
spin_unlock(&i8253_lock);
}
}
#ifdef CONFIG_SMP
smp_vic_timer_interrupt(regs);
#endif
}
void
voyager_power_off(void)
{
printk("VOYAGER Power Off\n");
if(voyager_level == 5) {
voyager_cat_power_off();
} else if(voyager_level == 4) {
/* This doesn't apparently work on most L4 machines,
* but the specs say to do this to get automatic power
* off. Unfortunately, if it doesn't power off the
* machine, it ends up doing a cold restart, which
* isn't really intended, so comment out the code */
#if 0
int port;
/* enable the voyager Configuration Space */
outb((inb(VOYAGER_MC_SETUP) & 0xf0) | 0x8,
VOYAGER_MC_SETUP);
/* the port for the power off flag is an offset from the
floating base */
port = (inb(VOYAGER_SSPB_RELOCATION_PORT) << 8) + 0x21;
/* set the power off flag */
outb(inb(port) | 0x1, port);
#endif
}
/* and wait for it to happen */
for(;;) {
__asm("cli");
__asm("hlt");
}
}
/* copied from process.c */
static inline void
kb_wait(void)
{
int i;
for (i=0; i<0x10000; i++)
if ((inb_p(0x64) & 0x02) == 0)
break;
}
void
machine_restart(char *cmd)
{
printk("Voyager Warm Restart\n");
kb_wait();
if(voyager_level == 5) {
/* write magic values to the RTC to inform system that
* shutdown is beginning */
outb(0x8f, 0x70);
outb(0x5 , 0x71);
udelay(50);
outb(0xfe,0x64); /* pull reset low */
} else if(voyager_level == 4) {
__u16 catbase = inb(VOYAGER_SSPB_RELOCATION_PORT)<<8;
__u8 basebd = inb(VOYAGER_MC_SETUP);
outb(basebd | 0x08, VOYAGER_MC_SETUP);
outb(0x02, catbase + 0x21);
}
for(;;) {
asm("cli");
asm("hlt");
}
}
void
mca_nmi_hook(void)
{
__u8 dumpval __attribute__((unused)) = inb(0xf823);
__u8 swnmi __attribute__((unused)) = inb(0xf813);
/* FIXME: assume dump switch pressed */
/* check to see if the dump switch was pressed */
VDEBUG(("VOYAGER: dumpval = 0x%x, swnmi = 0x%x\n", dumpval, swnmi));
/* clear swnmi */
outb(0xff, 0xf813);
/* tell SUS to ignore dump */
if(voyager_level == 5 && voyager_SUS != NULL) {
if(voyager_SUS->SUS_mbox == VOYAGER_DUMP_BUTTON_NMI) {
voyager_SUS->kernel_mbox = VOYAGER_NO_COMMAND;
voyager_SUS->kernel_flags |= VOYAGER_OS_IN_PROGRESS;
udelay(1000);
voyager_SUS->kernel_mbox = VOYAGER_IGNORE_DUMP;
voyager_SUS->kernel_flags &= ~VOYAGER_OS_IN_PROGRESS;
}
}
printk(KERN_ERR "VOYAGER: Dump switch pressed, printing CPU%d tracebacks\n", smp_processor_id());
show_stack(NULL, NULL);
show_state();
}
void
machine_halt(void)
{
/* treat a halt like a power off */
machine_power_off();
}
void machine_power_off(void)
{
if (pm_power_off)
pm_power_off();
}
