arch/i386/mach-voyager/voyager_basic.c

   1 /* Copyright (C) 1999,2001
   2  *
   3  * Author: J.E.J.Bottomley@HansenPartnership.com
   4  *
   5  * linux/arch/i386/kernel/voyager.c
   6  *
   7  * This file contains all the voyager specific routines for getting
   8  * initialisation of the architecture to function.  For additional
   9  * features see:
  10  *
  11  *      voyager_cat.c - Voyager CAT bus interface
  12  *      voyager_smp.c - Voyager SMP hal (emulates linux smp.c)
  13  */
  14
  15 #include <linux/config.h>
  16 #include <linux/module.h>
  17 #include <linux/types.h>
  18 #include <linux/sched.h>
  19 #include <linux/ptrace.h>
  20 #include <linux/ioport.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/init.h>
  23 #include <linux/delay.h>
  24 #include <linux/reboot.h>
  25 #include <linux/sysrq.h>
  26 #include <asm/io.h>
  27 #include <asm/voyager.h>
  28 #include <asm/vic.h>
  29 #include <linux/pm.h>
  30 #include <linux/irq.h>
  31 #include <asm/tlbflush.h>
  32 #include <asm/arch_hooks.h>
  33
  34 /*
  35  * Power off function, if any
  36  */
  37 void (*pm_power_off)(void);
  38
  39 int reboot_thru_bios;
  40
  41 int voyager_level = 0;
  42
  43 struct voyager_SUS *voyager_SUS = NULL;
  44
  45 #ifdef CONFIG_SMP
  46 static void
  47 voyager_dump(int dummy1, struct pt_regs *dummy2, struct tty_struct *dummy3)
  48 {
  49         /* get here via a sysrq */
  50         voyager_smp_dump();
  51 }
  52
  53 static struct sysrq_key_op sysrq_voyager_dump_op = {
  54         .handler        = voyager_dump,
  55         .help_msg       = "Voyager",
  56         .action_msg     = "Dump Voyager Status\n",
  57 };
  58 #endif
  59
  60 void
  61 voyager_detect(struct voyager_bios_info *bios)
  62 {
  63         if(bios->len != 0xff) {
  64                 int class = (bios->class_1 << 8)
  65                         | (bios->class_2 & 0xff);
  66
  67                 printk("Voyager System detected.\n"
  68                        "        Class %x, Revision %d.%d\n",
  69                        class, bios->major, bios->minor);
  70                 if(class == VOYAGER_LEVEL4)
  71                         voyager_level = 4;
  72                 else if(class < VOYAGER_LEVEL5_AND_ABOVE)
  73                         voyager_level = 3;
  74                 else
  75                         voyager_level = 5;
  76                 printk("        Architecture Level %d\n", voyager_level);
  77                 if(voyager_level < 4)
  78                         printk("\n**WARNING**: Voyager HAL only supports Levels 4 and 5 Architectures at the moment\n\n");
  79                 /* install the power off handler */
  80                 pm_power_off = voyager_power_off;
  81 #ifdef CONFIG_SMP
  82                 register_sysrq_key('v', &sysrq_voyager_dump_op);
  83 #endif
  84         } else {
  85                 printk("\n\n**WARNING**: No Voyager Subsystem Found\n");
  86         }
  87 }
  88
  89 void
  90 voyager_system_interrupt(int cpl, void *dev_id, struct pt_regs *regs)
  91 {
  92         printk("Voyager: detected system interrupt\n");
  93 }
  94
  95 /* Routine to read information from the extended CMOS area */
  96 __u8
  97 voyager_extended_cmos_read(__u16 addr)
  98 {
  99         outb(addr & 0xff, 0x74);
 100         outb((addr >> 8) & 0xff, 0x75);
 101         return inb(0x76);
 102 }
 103
 104 /* internal definitions for the SUS Click Map of memory */
 105
 106 #define CLICK_ENTRIES   16
 107 #define CLICK_SIZE      4096    /* click to byte conversion for Length */
 108
 109 typedef struct ClickMap {
 110         struct Entry {
 111                 __u32   Address;
 112                 __u32   Length;
 113         } Entry[CLICK_ENTRIES];
 114 } ClickMap_t;
 115
 116
 117 /* This routine is pretty much an awful hack to read the bios clickmap by
 118  * mapping it into page 0.  There are usually three regions in the map:
 119  *      Base Memory
 120  *      Extended Memory
 121  *      zero length marker for end of map
 122  *
 123  * Returns are 0 for failure and 1 for success on extracting region.
 124  */
 125 int __init
 126 voyager_memory_detect(int region, __u32 *start, __u32 *length)
 127 {
 128         int i;
 129         int retval = 0;
 130         __u8 cmos[4];
 131         ClickMap_t *map;
 132         unsigned long map_addr;
 133         unsigned long old;
 134
 135         if(region >= CLICK_ENTRIES) {
 136                 printk("Voyager: Illegal ClickMap region %d\n", region);
 137                 return 0;
 138         }
 139
 140         for(i = 0; i < sizeof(cmos); i++)
 141                 cmos[i] = voyager_extended_cmos_read(VOYAGER_MEMORY_CLICKMAP + i);
 142
 143         map_addr = *(unsigned long *)cmos;
 144
 145         /* steal page 0 for this */
 146         old = pg0[0];
 147         pg0[0] = ((map_addr & PAGE_MASK) | _PAGE_RW | _PAGE_PRESENT);
 148         local_flush_tlb();
 149         /* now clear everything out but page 0 */
 150         map = (ClickMap_t *)(map_addr & (~PAGE_MASK));
 151
 152         /* zero length is the end of the clickmap */
 153         if(map->Entry[region].Length != 0) {
 154                 *length = map->Entry[region].Length * CLICK_SIZE;
 155                 *start = map->Entry[region].Address;
 156                 retval = 1;
 157         }
 158
 159         /* replace the mapping */
 160         pg0[0] = old;
 161         local_flush_tlb();
 162         return retval;
 163 }
 164
 165 /* voyager specific handling code for timer interrupts.  Used to hand
 166  * off the timer tick to the SMP code, since the VIC doesn't have an
 167  * internal timer (The QIC does, but that's another story). */
 168 void
 169 voyager_timer_interrupt(struct pt_regs *regs)
 170 {
 171         if((jiffies & 0x3ff) == 0) {
 172
 173                 /* There seems to be something flaky in either
 174                  * hardware or software that is resetting the timer 0
 175                  * count to something much higher than it should be
 176                  * This seems to occur in the boot sequence, just
 177                  * before root is mounted.  Therefore, every 10
 178                  * seconds or so, we sanity check the timer zero count
 179                  * and kick it back to where it should be.
 180                  *
 181                  * FIXME: This is the most awful hack yet seen.  I
 182                  * should work out exactly what is interfering with
 183                  * the timer count settings early in the boot sequence
 184                  * and swiftly introduce it to something sharp and
 185                  * pointy.  */
 186                 __u16 val;
 187                 extern spinlock_t i8253_lock;
 188
 189                 spin_lock(&i8253_lock);
 190
 191                 outb_p(0x00, 0x43);
 192                 val = inb_p(0x40);
 193                 val |= inb(0x40) << 8;
 194                 spin_unlock(&i8253_lock);
 195
 196                 if(val > LATCH) {
 197                         printk("\nVOYAGER: countdown timer value too high (%d), resetting\n\n", val);
 198                         spin_lock(&i8253_lock);
 199                         outb(0x34,0x43);
 200                         outb_p(LATCH & 0xff , 0x40);    /* LSB */
 201                         outb(LATCH >> 8 , 0x40);        /* MSB */
 202                         spin_unlock(&i8253_lock);
 203                 }
 204         }
 205 #ifdef CONFIG_SMP
 206         smp_vic_timer_interrupt(regs);
 207 #endif
 208 }
 209
 210 void
 211 voyager_power_off(void)
 212 {
 213         printk("VOYAGER Power Off\n");
 214
 215         if(voyager_level == 5) {
 216                 voyager_cat_power_off();
 217         } else if(voyager_level == 4) {
 218                 /* This doesn't apparently work on most L4 machines,
 219                  * but the specs say to do this to get automatic power
 220                  * off.  Unfortunately, if it doesn't power off the
 221                  * machine, it ends up doing a cold restart, which
 222                  * isn't really intended, so comment out the code */
 223 #if 0
 224                 int port;
 225
 226
 227                 /* enable the voyager Configuration Space */
 228                 outb((inb(VOYAGER_MC_SETUP) & 0xf0) | 0x8,
 229                      VOYAGER_MC_SETUP);
 230                 /* the port for the power off flag is an offset from the
 231                    floating base */
 232                 port = (inb(VOYAGER_SSPB_RELOCATION_PORT) << 8) + 0x21;
 233                 /* set the power off flag */
 234                 outb(inb(port) | 0x1, port);
 235 #endif
 236         }
 237         /* and wait for it to happen */
 238         for(;;) {
 239                 __asm("cli");
 240                 __asm("hlt");
 241         }
 242 }
 243
 244 /* copied from process.c */
 245 static inline void
 246 kb_wait(void)
 247 {
 248         int i;
 249
 250         for (i=0; i<0x10000; i++)
 251                 if ((inb_p(0x64) & 0x02) == 0)
 252                         break;
 253 }
 254
 255 void
 256 machine_restart(char *cmd)
 257 {
 258         printk("Voyager Warm Restart\n");
 259         kb_wait();
 260
 261         if(voyager_level == 5) {
 262                 /* write magic values to the RTC to inform system that
 263                  * shutdown is beginning */
 264                 outb(0x8f, 0x70);
 265                 outb(0x5 , 0x71);
 266
 267                 udelay(50);
 268                 outb(0xfe,0x64);         /* pull reset low */
 269         } else if(voyager_level == 4) {
 270                 __u16 catbase = inb(VOYAGER_SSPB_RELOCATION_PORT)<<8;
 271                 __u8 basebd = inb(VOYAGER_MC_SETUP);
 272
 273                 outb(basebd | 0x08, VOYAGER_MC_SETUP);
 274                 outb(0x02, catbase + 0x21);
 275         }
 276         for(;;) {
 277                 asm("cli");
 278                 asm("hlt");
 279         }
 280 }
 281
 282 EXPORT_SYMBOL(machine_restart);
 283
 284 void
 285 mca_nmi_hook(void)
 286 {
 287         __u8 dumpval __attribute__((unused)) = inb(0xf823);
 288         __u8 swnmi __attribute__((unused)) = inb(0xf813);
 289
 290         /* FIXME: assume dump switch pressed */
 291         /* check to see if the dump switch was pressed */
 292         VDEBUG(("VOYAGER: dumpval = 0x%x, swnmi = 0x%x\n", dumpval, swnmi));
 293         /* clear swnmi */
 294         outb(0xff, 0xf813);
 295         /* tell SUS to ignore dump */
 296         if(voyager_level == 5 && voyager_SUS != NULL) {
 297                 if(voyager_SUS->SUS_mbox == VOYAGER_DUMP_BUTTON_NMI) {
 298                         voyager_SUS->kernel_mbox = VOYAGER_NO_COMMAND;
 299                         voyager_SUS->kernel_flags |= VOYAGER_OS_IN_PROGRESS;
 300                         udelay(1000);
 301                         voyager_SUS->kernel_mbox = VOYAGER_IGNORE_DUMP;
 302                         voyager_SUS->kernel_flags &= ~VOYAGER_OS_IN_PROGRESS;
 303                 }
 304         }
 305         printk(KERN_ERR "VOYAGER: Dump switch pressed, printing CPU%d tracebacks\n", smp_processor_id());
 306         show_stack(NULL, NULL);
 307         show_state();
 308 }
 309
 310
 311
 312 void
 313 machine_halt(void)
 314 {
 315         /* treat a halt like a power off */
 316         machine_power_off();
 317 }
 318
 319 EXPORT_SYMBOL(machine_halt);
 320
 321 void machine_power_off(void)
 322 {
 323         if (pm_power_off)
 324                 pm_power_off();
 325 }
 326
 327 EXPORT_SYMBOL(machine_power_off);