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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [x86/] [mach-voyager/] [voyager_basic.c] - Rev 3
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/* 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/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 <linux/smp.h> #include <linux/nodemask.h> #include <asm/io.h> #include <asm/voyager.h> #include <asm/vic.h> #include <linux/pm.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 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) { 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(void) { 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(); #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 */ local_irq_disable(); for(;;) halt(); } /* 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_shutdown(void) { /* Architecture specific shutdown needed before a kexec */ } 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); } local_irq_disable(); for(;;) halt(); } void machine_emergency_restart(void) { /*for now, just hook this to a warm restart */ machine_restart(NULL); } void mca_nmi_hook(void) { __u8 dumpval __maybe_unused = inb(0xf823); __u8 swnmi __maybe_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(); }