[PATCH] i386 voyager: Add machine_shutdown
[linux-2.6.git] / 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 #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
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",
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
188                 spin_lock(&i8253_lock);
189                 
190                 outb_p(0x00, 0x43);
191                 val = inb_p(0x40);
192                 val |= inb(0x40) << 8;
193                 spin_unlock(&i8253_lock);
194
195                 if(val > LATCH) {
196                         printk("\nVOYAGER: countdown timer value too high (%d), resetting\n\n", val);
197                         spin_lock(&i8253_lock);
198                         outb(0x34,0x43);
199                         outb_p(LATCH & 0xff , 0x40);    /* LSB */
200                         outb(LATCH >> 8 , 0x40);        /* MSB */
201                         spin_unlock(&i8253_lock);
202                 }
203         }
204 #ifdef CONFIG_SMP
205         smp_vic_timer_interrupt(regs);
206 #endif
207 }
208
209 void
210 voyager_power_off(void)
211 {
212         printk("VOYAGER Power Off\n");
213
214         if(voyager_level == 5) {
215                 voyager_cat_power_off();
216         } else if(voyager_level == 4) {
217                 /* This doesn't apparently work on most L4 machines,
218                  * but the specs say to do this to get automatic power
219                  * off.  Unfortunately, if it doesn't power off the
220                  * machine, it ends up doing a cold restart, which
221                  * isn't really intended, so comment out the code */
222 #if 0
223                 int port;
224
225           
226                 /* enable the voyager Configuration Space */
227                 outb((inb(VOYAGER_MC_SETUP) & 0xf0) | 0x8, 
228                      VOYAGER_MC_SETUP);
229                 /* the port for the power off flag is an offset from the
230                    floating base */
231                 port = (inb(VOYAGER_SSPB_RELOCATION_PORT) << 8) + 0x21;
232                 /* set the power off flag */
233                 outb(inb(port) | 0x1, port);
234 #endif
235         }
236         /* and wait for it to happen */
237         for(;;) {
238                 __asm("cli");
239                 __asm("hlt");
240         }
241 }
242
243 /* copied from process.c */
244 static inline void
245 kb_wait(void)
246 {
247         int i;
248
249         for (i=0; i<0x10000; i++)
250                 if ((inb_p(0x64) & 0x02) == 0)
251                         break;
252 }
253
254 void
255 machine_shutdown(void)
256 {
257         /* Architecture specific shutdown needed before a kexec */
258 }
259
260 void
261 machine_restart(char *cmd)
262 {
263         printk("Voyager Warm Restart\n");
264         kb_wait();
265
266         if(voyager_level == 5) {
267                 /* write magic values to the RTC to inform system that
268                  * shutdown is beginning */
269                 outb(0x8f, 0x70);
270                 outb(0x5 , 0x71);
271                 
272                 udelay(50);
273                 outb(0xfe,0x64);         /* pull reset low */
274         } else if(voyager_level == 4) {
275                 __u16 catbase = inb(VOYAGER_SSPB_RELOCATION_PORT)<<8;
276                 __u8 basebd = inb(VOYAGER_MC_SETUP);
277                 
278                 outb(basebd | 0x08, VOYAGER_MC_SETUP);
279                 outb(0x02, catbase + 0x21);
280         }
281         for(;;) {
282                 asm("cli");
283                 asm("hlt");
284         }
285 }
286
287 void
288 machine_emergency_restart(void)
289 {
290         /*for now, just hook this to a warm restart */
291         machine_restart(NULL);
292 }
293
294 void
295 mca_nmi_hook(void)
296 {
297         __u8 dumpval __attribute__((unused)) = inb(0xf823);
298         __u8 swnmi __attribute__((unused)) = inb(0xf813);
299
300         /* FIXME: assume dump switch pressed */
301         /* check to see if the dump switch was pressed */
302         VDEBUG(("VOYAGER: dumpval = 0x%x, swnmi = 0x%x\n", dumpval, swnmi));
303         /* clear swnmi */
304         outb(0xff, 0xf813);
305         /* tell SUS to ignore dump */
306         if(voyager_level == 5 && voyager_SUS != NULL) {
307                 if(voyager_SUS->SUS_mbox == VOYAGER_DUMP_BUTTON_NMI) {
308                         voyager_SUS->kernel_mbox = VOYAGER_NO_COMMAND;
309                         voyager_SUS->kernel_flags |= VOYAGER_OS_IN_PROGRESS;
310                         udelay(1000);
311                         voyager_SUS->kernel_mbox = VOYAGER_IGNORE_DUMP;
312                         voyager_SUS->kernel_flags &= ~VOYAGER_OS_IN_PROGRESS;
313                 }
314         }
315         printk(KERN_ERR "VOYAGER: Dump switch pressed, printing CPU%d tracebacks\n", smp_processor_id());
316         show_stack(NULL, NULL);
317         show_state();
318 }
319
320
321
322 void
323 machine_halt(void)
324 {
325         /* treat a halt like a power off */
326         machine_power_off();
327 }
328
329 void machine_power_off(void)
330 {
331         if (pm_power_off)
332                 pm_power_off();
333 }
334