arch/x86/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/module.h>
  16 #include <linux/types.h>
  17 #include <linux/sched.h>
  18 #include <linux/ptrace.h>
  19 #include <linux/ioport.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/init.h>
  22 #include <linux/delay.h>
  23 #include <linux/reboot.h>
  24 #include <linux/sysrq.h>
  25 #include <linux/smp.h>
  26 #include <linux/nodemask.h>
  27 #include <asm/io.h>
  28 #include <asm/voyager.h>
  29 #include <asm/vic.h>
  30 #include <linux/pm.h>
  31 #include <asm/tlbflush.h>
  32 #include <asm/arch_hooks.h>
  33 #include <asm/i8253.h>
  34
  35 /*
  36  * Power off function, if any
  37  */
  38 void (*pm_power_off) (void);
  39 EXPORT_SYMBOL(pm_power_off);
  40
  41 int voyager_level = 0;
  42
  43 struct voyager_SUS *voyager_SUS = NULL;
  44
  45 #ifdef CONFIG_SMP
  46 static void voyager_dump(int dummy1, struct tty_struct *dummy3)
  47 {
  48         /* get here via a sysrq */
  49         voyager_smp_dump();
  50 }
  51
  52 static struct sysrq_key_op sysrq_voyager_dump_op = {
  53         .handler = voyager_dump,
  54         .help_msg = "Voyager",
  55         .action_msg = "Dump Voyager Status",
  56 };
  57 #endif
  58
  59 void voyager_detect(struct voyager_bios_info *bios)
  60 {
  61         if (bios->len != 0xff) {
  62                 int class = (bios->class_1 << 8)
  63                     | (bios->class_2 & 0xff);
  64
  65                 printk("Voyager System detected.\n"
  66                        "        Class %x, Revision %d.%d\n",
  67                        class, bios->major, bios->minor);
  68                 if (class == VOYAGER_LEVEL4)
  69                         voyager_level = 4;
  70                 else if (class < VOYAGER_LEVEL5_AND_ABOVE)
  71                         voyager_level = 3;
  72                 else
  73                         voyager_level = 5;
  74                 printk("        Architecture Level %d\n", voyager_level);
  75                 if (voyager_level < 4)
  76                         printk
  77                             ("\n**WARNING**: Voyager HAL only supports Levels 4 and 5 Architectures at the moment\n\n");
  78                 /* install the power off handler */
  79                 pm_power_off = voyager_power_off;
  80 #ifdef CONFIG_SMP
  81                 register_sysrq_key('v', &sysrq_voyager_dump_op);
  82 #endif
  83         } else {
  84                 printk("\n\n**WARNING**: No Voyager Subsystem Found\n");
  85         }
  86 }
  87
  88 void voyager_system_interrupt(int cpl, void *dev_id)
  89 {
  90         printk("Voyager: detected system interrupt\n");
  91 }
  92
  93 /* Routine to read information from the extended CMOS area */
  94 __u8 voyager_extended_cmos_read(__u16 addr)
  95 {
  96         outb(addr & 0xff, 0x74);
  97         outb((addr >> 8) & 0xff, 0x75);
  98         return inb(0x76);
  99 }
 100
 101 /* internal definitions for the SUS Click Map of memory */
 102
 103 #define CLICK_ENTRIES   16
 104 #define CLICK_SIZE      4096    /* click to byte conversion for Length */
 105
 106 typedef struct ClickMap {
 107         struct Entry {
 108                 __u32 Address;
 109                 __u32 Length;
 110         } Entry[CLICK_ENTRIES];
 111 } ClickMap_t;
 112
 113 /* This routine is pretty much an awful hack to read the bios clickmap by
 114  * mapping it into page 0.  There are usually three regions in the map:
 115  *      Base Memory
 116  *      Extended Memory
 117  *      zero length marker for end of map
 118  *
 119  * Returns are 0 for failure and 1 for success on extracting region.
 120  */
 121 int __init voyager_memory_detect(int region, __u32 * start, __u32 * length)
 122 {
 123         int i;
 124         int retval = 0;
 125         __u8 cmos[4];
 126         ClickMap_t *map;
 127         unsigned long map_addr;
 128         unsigned long old;
 129
 130         if (region >= CLICK_ENTRIES) {
 131                 printk("Voyager: Illegal ClickMap region %d\n", region);
 132                 return 0;
 133         }
 134
 135         for (i = 0; i < sizeof(cmos); i++)
 136                 cmos[i] =
 137                     voyager_extended_cmos_read(VOYAGER_MEMORY_CLICKMAP + i);
 138
 139         map_addr = *(unsigned long *)cmos;
 140
 141         /* steal page 0 for this */
 142         old = pg0[0];
 143         pg0[0] = ((map_addr & PAGE_MASK) | _PAGE_RW | _PAGE_PRESENT);
 144         local_flush_tlb();
 145         /* now clear everything out but page 0 */
 146         map = (ClickMap_t *) (map_addr & (~PAGE_MASK));
 147
 148         /* zero length is the end of the clickmap */
 149         if (map->Entry[region].Length != 0) {
 150                 *length = map->Entry[region].Length * CLICK_SIZE;
 151                 *start = map->Entry[region].Address;
 152                 retval = 1;
 153         }
 154
 155         /* replace the mapping */
 156         pg0[0] = old;
 157         local_flush_tlb();
 158         return retval;
 159 }
 160
 161 /* voyager specific handling code for timer interrupts.  Used to hand
 162  * off the timer tick to the SMP code, since the VIC doesn't have an
 163  * internal timer (The QIC does, but that's another story). */
 164 void voyager_timer_interrupt(void)
 165 {
 166         if ((jiffies & 0x3ff) == 0) {
 167
 168                 /* There seems to be something flaky in either
 169                  * hardware or software that is resetting the timer 0
 170                  * count to something much higher than it should be
 171                  * This seems to occur in the boot sequence, just
 172                  * before root is mounted.  Therefore, every 10
 173                  * seconds or so, we sanity check the timer zero count
 174                  * and kick it back to where it should be.
 175                  *
 176                  * FIXME: This is the most awful hack yet seen.  I
 177                  * should work out exactly what is interfering with
 178                  * the timer count settings early in the boot sequence
 179                  * and swiftly introduce it to something sharp and
 180                  * pointy.  */
 181                 __u16 val;
 182
 183                 spin_lock(&i8253_lock);
 184
 185                 outb_p(0x00, 0x43);
 186                 val = inb_p(0x40);
 187                 val |= inb(0x40) << 8;
 188                 spin_unlock(&i8253_lock);
 189
 190                 if (val > LATCH) {
 191                         printk
 192                             ("\nVOYAGER: countdown timer value too high (%d), resetting\n\n",
 193                              val);
 194                         spin_lock(&i8253_lock);
 195                         outb(0x34, 0x43);
 196                         outb_p(LATCH & 0xff, 0x40);     /* LSB */
 197                         outb(LATCH >> 8, 0x40); /* MSB */
 198                         spin_unlock(&i8253_lock);
 199                 }
 200         }
 201 #ifdef CONFIG_SMP
 202         smp_vic_timer_interrupt();
 203 #endif
 204 }
 205
 206 void voyager_power_off(void)
 207 {
 208         printk("VOYAGER Power Off\n");
 209
 210         if (voyager_level == 5) {
 211                 voyager_cat_power_off();
 212         } else if (voyager_level == 4) {
 213                 /* This doesn't apparently work on most L4 machines,
 214                  * but the specs say to do this to get automatic power
 215                  * off.  Unfortunately, if it doesn't power off the
 216                  * machine, it ends up doing a cold restart, which
 217                  * isn't really intended, so comment out the code */
 218 #if 0
 219                 int port;
 220
 221                 /* enable the voyager Configuration Space */
 222                 outb((inb(VOYAGER_MC_SETUP) & 0xf0) | 0x8, VOYAGER_MC_SETUP);
 223                 /* the port for the power off flag is an offset from the
 224                    floating base */
 225                 port = (inb(VOYAGER_SSPB_RELOCATION_PORT) << 8) + 0x21;
 226                 /* set the power off flag */
 227                 outb(inb(port) | 0x1, port);
 228 #endif
 229         }
 230         /* and wait for it to happen */
 231         local_irq_disable();
 232         for (;;)
 233                 halt();
 234 }
 235
 236 /* copied from process.c */
 237 static inline void kb_wait(void)
 238 {
 239         int i;
 240
 241         for (i = 0; i < 0x10000; i++)
 242                 if ((inb_p(0x64) & 0x02) == 0)
 243                         break;
 244 }
 245
 246 void machine_shutdown(void)
 247 {
 248         /* Architecture specific shutdown needed before a kexec */
 249 }
 250
 251 void machine_restart(char *cmd)
 252 {
 253         printk("Voyager Warm Restart\n");
 254         kb_wait();
 255
 256         if (voyager_level == 5) {
 257                 /* write magic values to the RTC to inform system that
 258                  * shutdown is beginning */
 259                 outb(0x8f, 0x70);
 260                 outb(0x5, 0x71);
 261
 262                 udelay(50);
 263                 outb(0xfe, 0x64);       /* pull reset low */
 264         } else if (voyager_level == 4) {
 265                 __u16 catbase = inb(VOYAGER_SSPB_RELOCATION_PORT) << 8;
 266                 __u8 basebd = inb(VOYAGER_MC_SETUP);
 267
 268                 outb(basebd | 0x08, VOYAGER_MC_SETUP);
 269                 outb(0x02, catbase + 0x21);
 270         }
 271         local_irq_disable();
 272         for (;;)
 273                 halt();
 274 }
 275
 276 void machine_emergency_restart(void)
 277 {
 278         /*for now, just hook this to a warm restart */
 279         machine_restart(NULL);
 280 }
 281
 282 void mca_nmi_hook(void)
 283 {
 284         __u8 dumpval __maybe_unused = inb(0xf823);
 285         __u8 swnmi __maybe_unused = inb(0xf813);
 286
 287         /* FIXME: assume dump switch pressed */
 288         /* check to see if the dump switch was pressed */
 289         VDEBUG(("VOYAGER: dumpval = 0x%x, swnmi = 0x%x\n", dumpval, swnmi));
 290         /* clear swnmi */
 291         outb(0xff, 0xf813);
 292         /* tell SUS to ignore dump */
 293         if (voyager_level == 5 && voyager_SUS != NULL) {
 294                 if (voyager_SUS->SUS_mbox == VOYAGER_DUMP_BUTTON_NMI) {
 295                         voyager_SUS->kernel_mbox = VOYAGER_NO_COMMAND;
 296                         voyager_SUS->kernel_flags |= VOYAGER_OS_IN_PROGRESS;
 297                         udelay(1000);
 298                         voyager_SUS->kernel_mbox = VOYAGER_IGNORE_DUMP;
 299                         voyager_SUS->kernel_flags &= ~VOYAGER_OS_IN_PROGRESS;
 300                 }
 301         }
 302         printk(KERN_ERR
 303                "VOYAGER: Dump switch pressed, printing CPU%d tracebacks\n",
 304                smp_processor_id());
 305         show_stack(NULL, NULL);
 306         show_state();
 307 }
 308
 309 void machine_halt(void)
 310 {
 311         /* treat a halt like a power off */
 312         machine_power_off();
 313 }
 314
 315 void machine_power_off(void)
 316 {
 317         if (pm_power_off)
 318                 pm_power_off();
 319 }