Linux-2.6.12-rc2
[linux-3.10.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
34 /*
35  * Power off function, if any
36  */
37 void (*pm_power_off)(void);
38
39 int voyager_level = 0;
40
41 struct voyager_SUS *voyager_SUS = NULL;
42
43 #ifdef CONFIG_SMP
44 static void
45 voyager_dump(int dummy1, struct pt_regs *dummy2, struct tty_struct *dummy3)
46 {
47         /* get here via a sysrq */
48         voyager_smp_dump();
49 }
50
51 static struct sysrq_key_op sysrq_voyager_dump_op = {
52         .handler        = voyager_dump,
53         .help_msg       = "Voyager",
54         .action_msg     = "Dump Voyager Status",
55 };
56 #endif
57
58 void
59 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("\n**WARNING**: Voyager HAL only supports Levels 4 and 5 Architectures at the moment\n\n");
77                 /* install the power off handler */
78                 pm_power_off = voyager_power_off;
79 #ifdef CONFIG_SMP
80                 register_sysrq_key('v', &sysrq_voyager_dump_op);
81 #endif
82         } else {
83                 printk("\n\n**WARNING**: No Voyager Subsystem Found\n");
84         }
85 }
86
87 void
88 voyager_system_interrupt(int cpl, void *dev_id, struct pt_regs *regs)
89 {
90         printk("Voyager: detected system interrupt\n");
91 }
92
93 /* Routine to read information from the extended CMOS area */
94 __u8
95 voyager_extended_cmos_read(__u16 addr)
96 {
97         outb(addr & 0xff, 0x74);
98         outb((addr >> 8) & 0xff, 0x75);
99         return inb(0x76);
100 }
101
102 /* internal definitions for the SUS Click Map of memory */
103
104 #define CLICK_ENTRIES   16
105 #define CLICK_SIZE      4096    /* click to byte conversion for Length */
106
107 typedef struct ClickMap {
108         struct Entry {
109                 __u32   Address;
110                 __u32   Length;
111         } Entry[CLICK_ENTRIES];
112 } ClickMap_t;
113
114
115 /* This routine is pretty much an awful hack to read the bios clickmap by
116  * mapping it into page 0.  There are usually three regions in the map:
117  *      Base Memory
118  *      Extended Memory
119  *      zero length marker for end of map
120  *
121  * Returns are 0 for failure and 1 for success on extracting region.
122  */
123 int __init
124 voyager_memory_detect(int region, __u32 *start, __u32 *length)
125 {
126         int i;
127         int retval = 0;
128         __u8 cmos[4];
129         ClickMap_t *map;
130         unsigned long map_addr;
131         unsigned long old;
132
133         if(region >= CLICK_ENTRIES) {
134                 printk("Voyager: Illegal ClickMap region %d\n", region);
135                 return 0;
136         }
137
138         for(i = 0; i < sizeof(cmos); i++)
139                 cmos[i] = voyager_extended_cmos_read(VOYAGER_MEMORY_CLICKMAP + i);
140
141         map_addr = *(unsigned long *)cmos;
142
143         /* steal page 0 for this */
144         old = pg0[0];
145         pg0[0] = ((map_addr & PAGE_MASK) | _PAGE_RW | _PAGE_PRESENT);
146         local_flush_tlb();
147         /* now clear everything out but page 0 */
148         map = (ClickMap_t *)(map_addr & (~PAGE_MASK));
149
150         /* zero length is the end of the clickmap */
151         if(map->Entry[region].Length != 0) {
152                 *length = map->Entry[region].Length * CLICK_SIZE;
153                 *start = map->Entry[region].Address;
154                 retval = 1;
155         }
156
157         /* replace the mapping */
158         pg0[0] = old;
159         local_flush_tlb();
160         return retval;
161 }
162
163 /* voyager specific handling code for timer interrupts.  Used to hand
164  * off the timer tick to the SMP code, since the VIC doesn't have an
165  * internal timer (The QIC does, but that's another story). */
166 void
167 voyager_timer_interrupt(struct pt_regs *regs)
168 {
169         if((jiffies & 0x3ff) == 0) {
170
171                 /* There seems to be something flaky in either
172                  * hardware or software that is resetting the timer 0
173                  * count to something much higher than it should be
174                  * This seems to occur in the boot sequence, just
175                  * before root is mounted.  Therefore, every 10
176                  * seconds or so, we sanity check the timer zero count
177                  * and kick it back to where it should be.
178                  *
179                  * FIXME: This is the most awful hack yet seen.  I
180                  * should work out exactly what is interfering with
181                  * the timer count settings early in the boot sequence
182                  * and swiftly introduce it to something sharp and
183                  * pointy.  */
184                 __u16 val;
185                 extern spinlock_t i8253_lock;
186
187                 spin_lock(&i8253_lock);
188                 
189                 outb_p(0x00, 0x43);
190                 val = inb_p(0x40);
191                 val |= inb(0x40) << 8;
192                 spin_unlock(&i8253_lock);
193
194                 if(val > LATCH) {
195                         printk("\nVOYAGER: countdown timer value too high (%d), resetting\n\n", val);
196                         spin_lock(&i8253_lock);
197                         outb(0x34,0x43);
198                         outb_p(LATCH & 0xff , 0x40);    /* LSB */
199                         outb(LATCH >> 8 , 0x40);        /* MSB */
200                         spin_unlock(&i8253_lock);
201                 }
202         }
203 #ifdef CONFIG_SMP
204         smp_vic_timer_interrupt(regs);
205 #endif
206 }
207
208 void
209 voyager_power_off(void)
210 {
211         printk("VOYAGER Power Off\n");
212
213         if(voyager_level == 5) {
214                 voyager_cat_power_off();
215         } else if(voyager_level == 4) {
216                 /* This doesn't apparently work on most L4 machines,
217                  * but the specs say to do this to get automatic power
218                  * off.  Unfortunately, if it doesn't power off the
219                  * machine, it ends up doing a cold restart, which
220                  * isn't really intended, so comment out the code */
221 #if 0
222                 int port;
223
224           
225                 /* enable the voyager Configuration Space */
226                 outb((inb(VOYAGER_MC_SETUP) & 0xf0) | 0x8, 
227                      VOYAGER_MC_SETUP);
228                 /* the port for the power off flag is an offset from the
229                    floating base */
230                 port = (inb(VOYAGER_SSPB_RELOCATION_PORT) << 8) + 0x21;
231                 /* set the power off flag */
232                 outb(inb(port) | 0x1, port);
233 #endif
234         }
235         /* and wait for it to happen */
236         for(;;) {
237                 __asm("cli");
238                 __asm("hlt");
239         }
240 }
241
242 /* copied from process.c */
243 static inline void
244 kb_wait(void)
245 {
246         int i;
247
248         for (i=0; i<0x10000; i++)
249                 if ((inb_p(0x64) & 0x02) == 0)
250                         break;
251 }
252
253 void
254 machine_restart(char *cmd)
255 {
256         printk("Voyager Warm Restart\n");
257         kb_wait();
258
259         if(voyager_level == 5) {
260                 /* write magic values to the RTC to inform system that
261                  * shutdown is beginning */
262                 outb(0x8f, 0x70);
263                 outb(0x5 , 0x71);
264                 
265                 udelay(50);
266                 outb(0xfe,0x64);         /* pull reset low */
267         } else if(voyager_level == 4) {
268                 __u16 catbase = inb(VOYAGER_SSPB_RELOCATION_PORT)<<8;
269                 __u8 basebd = inb(VOYAGER_MC_SETUP);
270                 
271                 outb(basebd | 0x08, VOYAGER_MC_SETUP);
272                 outb(0x02, catbase + 0x21);
273         }
274         for(;;) {
275                 asm("cli");
276                 asm("hlt");
277         }
278 }
279
280 EXPORT_SYMBOL(machine_restart);
281
282 void
283 mca_nmi_hook(void)
284 {
285         __u8 dumpval __attribute__((unused)) = inb(0xf823);
286         __u8 swnmi __attribute__((unused)) = inb(0xf813);
287
288         /* FIXME: assume dump switch pressed */
289         /* check to see if the dump switch was pressed */
290         VDEBUG(("VOYAGER: dumpval = 0x%x, swnmi = 0x%x\n", dumpval, swnmi));
291         /* clear swnmi */
292         outb(0xff, 0xf813);
293         /* tell SUS to ignore dump */
294         if(voyager_level == 5 && voyager_SUS != NULL) {
295                 if(voyager_SUS->SUS_mbox == VOYAGER_DUMP_BUTTON_NMI) {
296                         voyager_SUS->kernel_mbox = VOYAGER_NO_COMMAND;
297                         voyager_SUS->kernel_flags |= VOYAGER_OS_IN_PROGRESS;
298                         udelay(1000);
299                         voyager_SUS->kernel_mbox = VOYAGER_IGNORE_DUMP;
300                         voyager_SUS->kernel_flags &= ~VOYAGER_OS_IN_PROGRESS;
301                 }
302         }
303         printk(KERN_ERR "VOYAGER: Dump switch pressed, printing CPU%d tracebacks\n", smp_processor_id());
304         show_stack(NULL, NULL);
305         show_state();
306 }
307
308
309
310 void
311 machine_halt(void)
312 {
313         /* treat a halt like a power off */
314         machine_power_off();
315 }
316
317 EXPORT_SYMBOL(machine_halt);
318
319 void machine_power_off(void)
320 {
321         if (pm_power_off)
322                 pm_power_off();
323 }
324
325 EXPORT_SYMBOL(machine_power_off);