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
21static 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
38void 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'. */
52void 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'. */
69void 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}
83EXPORT_SYMBOL(prom_feval);
84
85/* Drop into the prom, with the chance to continue with the 'go'
86 * prom command.
87 */
88void 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 */
115void 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
123again:
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
131void 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 */
152unsigned 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
165int 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
183static 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. */
203static 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
223long 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
230long 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
237int 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
263void 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 */
281int 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 */
318int 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. */
343void 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
353int 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
366int 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
380void 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
393void 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
406void 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
417void 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
427void 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
437void 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