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1da177e4 LT |
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> | |
306e440d | 33 | #include <asm/i8253.h> |
1da177e4 LT |
34 | |
35 | /* | |
36 | * Power off function, if any | |
37 | */ | |
38 | void (*pm_power_off)(void); | |
153f8057 | 39 | EXPORT_SYMBOL(pm_power_off); |
1da177e4 LT |
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; | |
1da177e4 LT |
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 */ | |
f2ab4461 ZA |
237 | local_irq_disable(); |
238 | for(;;) | |
239 | halt(); | |
1da177e4 LT |
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 | ||
094528a7 EB |
253 | void |
254 | machine_shutdown(void) | |
255 | { | |
256 | /* Architecture specific shutdown needed before a kexec */ | |
257 | } | |
258 | ||
1da177e4 LT |
259 | void |
260 | machine_restart(char *cmd) | |
261 | { | |
262 | printk("Voyager Warm Restart\n"); | |
263 | kb_wait(); | |
264 | ||
265 | if(voyager_level == 5) { | |
266 | /* write magic values to the RTC to inform system that | |
267 | * shutdown is beginning */ | |
268 | outb(0x8f, 0x70); | |
269 | outb(0x5 , 0x71); | |
270 | ||
271 | udelay(50); | |
272 | outb(0xfe,0x64); /* pull reset low */ | |
273 | } else if(voyager_level == 4) { | |
274 | __u16 catbase = inb(VOYAGER_SSPB_RELOCATION_PORT)<<8; | |
275 | __u8 basebd = inb(VOYAGER_MC_SETUP); | |
276 | ||
277 | outb(basebd | 0x08, VOYAGER_MC_SETUP); | |
278 | outb(0x02, catbase + 0x21); | |
279 | } | |
f2ab4461 ZA |
280 | local_irq_disable(); |
281 | for(;;) | |
282 | halt(); | |
1da177e4 LT |
283 | } |
284 | ||
e6cb9941 JB |
285 | void |
286 | machine_emergency_restart(void) | |
287 | { | |
288 | /*for now, just hook this to a warm restart */ | |
289 | machine_restart(NULL); | |
290 | } | |
291 | ||
1da177e4 LT |
292 | void |
293 | mca_nmi_hook(void) | |
294 | { | |
295 | __u8 dumpval __attribute__((unused)) = inb(0xf823); | |
296 | __u8 swnmi __attribute__((unused)) = inb(0xf813); | |
297 | ||
298 | /* FIXME: assume dump switch pressed */ | |
299 | /* check to see if the dump switch was pressed */ | |
300 | VDEBUG(("VOYAGER: dumpval = 0x%x, swnmi = 0x%x\n", dumpval, swnmi)); | |
301 | /* clear swnmi */ | |
302 | outb(0xff, 0xf813); | |
303 | /* tell SUS to ignore dump */ | |
304 | if(voyager_level == 5 && voyager_SUS != NULL) { | |
305 | if(voyager_SUS->SUS_mbox == VOYAGER_DUMP_BUTTON_NMI) { | |
306 | voyager_SUS->kernel_mbox = VOYAGER_NO_COMMAND; | |
307 | voyager_SUS->kernel_flags |= VOYAGER_OS_IN_PROGRESS; | |
308 | udelay(1000); | |
309 | voyager_SUS->kernel_mbox = VOYAGER_IGNORE_DUMP; | |
310 | voyager_SUS->kernel_flags &= ~VOYAGER_OS_IN_PROGRESS; | |
311 | } | |
312 | } | |
313 | printk(KERN_ERR "VOYAGER: Dump switch pressed, printing CPU%d tracebacks\n", smp_processor_id()); | |
314 | show_stack(NULL, NULL); | |
315 | show_state(); | |
316 | } | |
317 | ||
318 | ||
319 | ||
320 | void | |
321 | machine_halt(void) | |
322 | { | |
323 | /* treat a halt like a power off */ | |
324 | machine_power_off(); | |
325 | } | |
326 | ||
1da177e4 LT |
327 | void machine_power_off(void) |
328 | { | |
329 | if (pm_power_off) | |
330 | pm_power_off(); | |
331 | } | |
332 |