xref: /openbmc/linux/arch/sparc/prom/misc_64.c (revision b2441318)
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 
prom_service_exists(const char * service_name)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 
prom_sun4v_guest_soft_state(void)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'. */
prom_reboot(const char * 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'. */
prom_feval(const char * 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  */
prom_cmdline(void)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  */
prom_halt(void)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 
prom_halt_power_off(void)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  */
prom_get_idprom(char * idbuf,int num_bytes)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 
prom_get_mmu_ihandle(void)165 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 
prom_get_memory_ihandle(void)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. */
tlb_load(const char * type,unsigned long index,unsigned long tte_data,unsigned long vaddr)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 
prom_itlb_load(unsigned long index,unsigned long tte_data,unsigned long vaddr)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 
prom_dtlb_load(unsigned long index,unsigned long tte_data,unsigned long vaddr)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 
prom_map(int mode,unsigned long size,unsigned long vaddr,unsigned long paddr)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 
prom_unmap(unsigned long size,unsigned long vaddr)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  */
prom_retain(const char * name,unsigned long size,unsigned long align,unsigned long * paddr)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  */
prom_getunumber(int syndrome_code,unsigned long phys_addr,char * buf,int buflen)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. */
prom_sleepself(void)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 
prom_sleepsystem(void)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 
prom_wakeupsystem(void)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
prom_startcpu(int cpunode,unsigned long pc,unsigned long arg)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 
prom_startcpu_cpuid(int cpuid,unsigned long pc,unsigned long arg)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 
prom_stopcpu_cpuid(int cpuid)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 
prom_stopself(void)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 
prom_idleself(void)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 
prom_resumecpu(int cpunode)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