1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * misc.c: Miscellaneous prom functions that don't belong
4 * anywhere else.
5 *
6 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
7 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
8 */
9
10 #include <linux/types.h>
11 #include <linux/kernel.h>
12 #include <linux/sched.h>
13 #include <linux/interrupt.h>
14 #include <linux/delay.h>
15 #include <linux/module.h>
16
17 #include <asm/openprom.h>
18 #include <asm/oplib.h>
19 #include <asm/ldc.h>
20
21 static int prom_service_exists(const char *service_name)
22 {
23 unsigned long args[5];
24
25 args[0] = (unsigned long) "test";
26 args[1] = 1;
27 args[2] = 1;
28 args[3] = (unsigned long) service_name;
29 args[4] = (unsigned long) -1;
30
31 p1275_cmd_direct(args);
32
33 if (args[4])
34 return 0;
35 return 1;
36 }
37
38 void prom_sun4v_guest_soft_state(void)
39 {
40 const char *svc = "SUNW,soft-state-supported";
41 unsigned long args[3];
42
43 if (!prom_service_exists(svc))
44 return;
45 args[0] = (unsigned long) svc;
46 args[1] = 0;
47 args[2] = 0;
48 p1275_cmd_direct(args);
49 }
50
51 /* Reset and reboot the machine with the command 'bcommand'. */
52 void prom_reboot(const char *bcommand)
53 {
54 unsigned long args[4];
55
56 #ifdef CONFIG_SUN_LDOMS
57 if (ldom_domaining_enabled)
58 ldom_reboot(bcommand);
59 #endif
60 args[0] = (unsigned long) "boot";
61 args[1] = 1;
62 args[2] = 0;
63 args[3] = (unsigned long) bcommand;
64
65 p1275_cmd_direct(args);
66 }
67
68 /* Forth evaluate the expression contained in 'fstring'. */
69 void prom_feval(const char *fstring)
70 {
71 unsigned long args[5];
72
73 if (!fstring || fstring[0] == 0)
74 return;
75 args[0] = (unsigned long) "interpret";
76 args[1] = 1;
77 args[2] = 1;
78 args[3] = (unsigned long) fstring;
79 args[4] = (unsigned long) -1;
80
81 p1275_cmd_direct(args);
82 }
83 EXPORT_SYMBOL(prom_feval);
84
85 /* Drop into the prom, with the chance to continue with the 'go'
86 * prom command.
87 */
88 void prom_cmdline(void)
89 {
90 unsigned long args[3];
91 unsigned long flags;
92
93 local_irq_save(flags);
94
95 #ifdef CONFIG_SMP
96 smp_capture();
97 #endif
98
99 args[0] = (unsigned long) "enter";
100 args[1] = 0;
101 args[2] = 0;
102
103 p1275_cmd_direct(args);
104
105 #ifdef CONFIG_SMP
106 smp_release();
107 #endif
108
109 local_irq_restore(flags);
110 }
111
112 /* Drop into the prom, but completely terminate the program.
113 * No chance of continuing.
114 */
115 void notrace prom_halt(void)
116 {
117 unsigned long args[3];
118
119 #ifdef CONFIG_SUN_LDOMS
120 if (ldom_domaining_enabled)
121 ldom_power_off();
122 #endif
123 again:
124 args[0] = (unsigned long) "exit";
125 args[1] = 0;
126 args[2] = 0;
127 p1275_cmd_direct(args);
128 goto again; /* PROM is out to get me -DaveM */
129 }
130
131 void prom_halt_power_off(void)
132 {
133 unsigned long args[3];
134
135 #ifdef CONFIG_SUN_LDOMS
136 if (ldom_domaining_enabled)
137 ldom_power_off();
138 #endif
139 args[0] = (unsigned long) "SUNW,power-off";
140 args[1] = 0;
141 args[2] = 0;
142 p1275_cmd_direct(args);
143
144 /* if nothing else helps, we just halt */
145 prom_halt();
146 }
147
148 /* Get the idprom and stuff it into buffer 'idbuf'. Returns the
149 * format type. 'num_bytes' is the number of bytes that your idbuf
150 * has space for. Returns 0xff on error.
151 */
152 unsigned char prom_get_idprom(char *idbuf, int num_bytes)
153 {
154 int len;
155
156 len = prom_getproplen(prom_root_node, "idprom");
157 if ((len >num_bytes) || (len == -1))
158 return 0xff;
159 if (!prom_getproperty(prom_root_node, "idprom", idbuf, num_bytes))
160 return idbuf[0];
161
162 return 0xff;
163 }
164
165 static int prom_get_mmu_ihandle(void)
166 {
167 phandle node;
168 int ret;
169
170 if (prom_mmu_ihandle_cache != 0)
171 return prom_mmu_ihandle_cache;
172
173 node = prom_finddevice(prom_chosen_path);
174 ret = prom_getint(node, prom_mmu_name);
175 if (ret == -1 || ret == 0)
176 prom_mmu_ihandle_cache = -1;
177 else
178 prom_mmu_ihandle_cache = ret;
179
180 return ret;
181 }
182
183 static int prom_get_memory_ihandle(void)
184 {
185 static int memory_ihandle_cache;
186 phandle node;
187 int ret;
188
189 if (memory_ihandle_cache != 0)
190 return memory_ihandle_cache;
191
192 node = prom_finddevice("/chosen");
193 ret = prom_getint(node, "memory");
194 if (ret == -1 || ret == 0)
195 memory_ihandle_cache = -1;
196 else
197 memory_ihandle_cache = ret;
198
199 return ret;
200 }
201
202 /* Load explicit I/D TLB entries. */
203 static long tlb_load(const char *type, unsigned long index,
204 unsigned long tte_data, unsigned long vaddr)
205 {
206 unsigned long args[9];
207
208 args[0] = (unsigned long) prom_callmethod_name;
209 args[1] = 5;
210 args[2] = 1;
211 args[3] = (unsigned long) type;
212 args[4] = (unsigned int) prom_get_mmu_ihandle();
213 args[5] = vaddr;
214 args[6] = tte_data;
215 args[7] = index;
216 args[8] = (unsigned long) -1;
217
218 p1275_cmd_direct(args);
219
220 return (long) args[8];
221 }
222
223 long prom_itlb_load(unsigned long index,
224 unsigned long tte_data,
225 unsigned long vaddr)
226 {
227 return tlb_load("SUNW,itlb-load", index, tte_data, vaddr);
228 }
229
230 long prom_dtlb_load(unsigned long index,
231 unsigned long tte_data,
232 unsigned long vaddr)
233 {
234 return tlb_load("SUNW,dtlb-load", index, tte_data, vaddr);
235 }
236
237 int prom_map(int mode, unsigned long size,
238 unsigned long vaddr, unsigned long paddr)
239 {
240 unsigned long args[11];
241 int ret;
242
243 args[0] = (unsigned long) prom_callmethod_name;
244 args[1] = 7;
245 args[2] = 1;
246 args[3] = (unsigned long) prom_map_name;
247 args[4] = (unsigned int) prom_get_mmu_ihandle();
248 args[5] = (unsigned int) mode;
249 args[6] = size;
250 args[7] = vaddr;
251 args[8] = 0;
252 args[9] = paddr;
253 args[10] = (unsigned long) -1;
254
255 p1275_cmd_direct(args);
256
257 ret = (int) args[10];
258 if (ret == 0)
259 ret = -1;
260 return ret;
261 }
262
263 void prom_unmap(unsigned long size, unsigned long vaddr)
264 {
265 unsigned long args[7];
266
267 args[0] = (unsigned long) prom_callmethod_name;
268 args[1] = 4;
269 args[2] = 0;
270 args[3] = (unsigned long) prom_unmap_name;
271 args[4] = (unsigned int) prom_get_mmu_ihandle();
272 args[5] = size;
273 args[6] = vaddr;
274
275 p1275_cmd_direct(args);
276 }
277
278 /* Set aside physical memory which is not touched or modified
279 * across soft resets.
280 */
281 int prom_retain(const char *name, unsigned long size,
282 unsigned long align, unsigned long *paddr)
283 {
284 unsigned long args[11];
285
286 args[0] = (unsigned long) prom_callmethod_name;
287 args[1] = 5;
288 args[2] = 3;
289 args[3] = (unsigned long) "SUNW,retain";
290 args[4] = (unsigned int) prom_get_memory_ihandle();
291 args[5] = align;
292 args[6] = size;
293 args[7] = (unsigned long) name;
294 args[8] = (unsigned long) -1;
295 args[9] = (unsigned long) -1;
296 args[10] = (unsigned long) -1;
297
298 p1275_cmd_direct(args);
299
300 if (args[8])
301 return (int) args[8];
302
303 /* Next we get "phys_high" then "phys_low". On 64-bit
304 * the phys_high cell is don't care since the phys_low
305 * cell has the full value.
306 */
307 *paddr = args[10];
308
309 return 0;
310 }
311
312 /* Get "Unumber" string for the SIMM at the given
313 * memory address. Usually this will be of the form
314 * "Uxxxx" where xxxx is a decimal number which is
315 * etched into the motherboard next to the SIMM slot
316 * in question.
317 */
318 int prom_getunumber(int syndrome_code,
319 unsigned long phys_addr,
320 char *buf, int buflen)
321 {
322 unsigned long args[12];
323
324 args[0] = (unsigned long) prom_callmethod_name;
325 args[1] = 7;
326 args[2] = 2;
327 args[3] = (unsigned long) "SUNW,get-unumber";
328 args[4] = (unsigned int) prom_get_memory_ihandle();
329 args[5] = buflen;
330 args[6] = (unsigned long) buf;
331 args[7] = 0;
332 args[8] = phys_addr;
333 args[9] = (unsigned int) syndrome_code;
334 args[10] = (unsigned long) -1;
335 args[11] = (unsigned long) -1;
336
337 p1275_cmd_direct(args);
338
339 return (int) args[10];
340 }
341
342 /* Power management extensions. */
343 void prom_sleepself(void)
344 {
345 unsigned long args[3];
346
347 args[0] = (unsigned long) "SUNW,sleep-self";
348 args[1] = 0;
349 args[2] = 0;
350 p1275_cmd_direct(args);
351 }
352
353 int prom_sleepsystem(void)
354 {
355 unsigned long args[4];
356
357 args[0] = (unsigned long) "SUNW,sleep-system";
358 args[1] = 0;
359 args[2] = 1;
360 args[3] = (unsigned long) -1;
361 p1275_cmd_direct(args);
362
363 return (int) args[3];
364 }
365
366 int prom_wakeupsystem(void)
367 {
368 unsigned long args[4];
369
370 args[0] = (unsigned long) "SUNW,wakeup-system";
371 args[1] = 0;
372 args[2] = 1;
373 args[3] = (unsigned long) -1;
374 p1275_cmd_direct(args);
375
376 return (int) args[3];
377 }
378
379 #ifdef CONFIG_SMP
380 void prom_startcpu(int cpunode, unsigned long pc, unsigned long arg)
381 {
382 unsigned long args[6];
383
384 args[0] = (unsigned long) "SUNW,start-cpu";
385 args[1] = 3;
386 args[2] = 0;
387 args[3] = (unsigned int) cpunode;
388 args[4] = pc;
389 args[5] = arg;
390 p1275_cmd_direct(args);
391 }
392
393 void prom_startcpu_cpuid(int cpuid, unsigned long pc, unsigned long arg)
394 {
395 unsigned long args[6];
396
397 args[0] = (unsigned long) "SUNW,start-cpu-by-cpuid";
398 args[1] = 3;
399 args[2] = 0;
400 args[3] = (unsigned int) cpuid;
401 args[4] = pc;
402 args[5] = arg;
403 p1275_cmd_direct(args);
404 }
405
406 void prom_stopcpu_cpuid(int cpuid)
407 {
408 unsigned long args[4];
409
410 args[0] = (unsigned long) "SUNW,stop-cpu-by-cpuid";
411 args[1] = 1;
412 args[2] = 0;
413 args[3] = (unsigned int) cpuid;
414 p1275_cmd_direct(args);
415 }
416
417 void prom_stopself(void)
418 {
419 unsigned long args[3];
420
421 args[0] = (unsigned long) "SUNW,stop-self";
422 args[1] = 0;
423 args[2] = 0;
424 p1275_cmd_direct(args);
425 }
426
427 void prom_idleself(void)
428 {
429 unsigned long args[3];
430
431 args[0] = (unsigned long) "SUNW,idle-self";
432 args[1] = 0;
433 args[2] = 0;
434 p1275_cmd_direct(args);
435 }
436
437 void prom_resumecpu(int cpunode)
438 {
439 unsigned long args[4];
440
441 args[0] = (unsigned long) "SUNW,resume-cpu";
442 args[1] = 1;
443 args[2] = 0;
444 args[3] = (unsigned int) cpunode;
445 p1275_cmd_direct(args);
446 }
447 #endif
448
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