1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * System Abstraction Layer (SAL) interface routines.
4 *
5 * Copyright (C) 1998, 1999, 2001, 2003 Hewlett-Packard Co
6 * David Mosberger-Tang <davidm@hpl.hp.com>
7 * Copyright (C) 1999 VA Linux Systems
8 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
9 */
10
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/spinlock.h>
15 #include <linux/string.h>
16
17 #include <asm/delay.h>
18 #include <asm/page.h>
19 #include <asm/sal.h>
20 #include <asm/pal.h>
21 #include <asm/xtp.h>
22
23 __cacheline_aligned DEFINE_SPINLOCK(sal_lock);
24 unsigned long sal_platform_features;
25
26 unsigned short sal_revision;
27 unsigned short sal_version;
28
29 #define SAL_MAJOR(x) ((x) >> 8)
30 #define SAL_MINOR(x) ((x) & 0xff)
31
32 static struct {
33 void *addr; /* function entry point */
34 void *gpval; /* gp value to use */
35 } pdesc;
36
37 static long
default_handler(void)38 default_handler (void)
39 {
40 return -1;
41 }
42
43 ia64_sal_handler ia64_sal = (ia64_sal_handler) default_handler;
44 ia64_sal_desc_ptc_t *ia64_ptc_domain_info;
45
46 const char *
ia64_sal_strerror(long status)47 ia64_sal_strerror (long status)
48 {
49 const char *str;
50 switch (status) {
51 case 0: str = "Call completed without error"; break;
52 case 1: str = "Effect a warm boot of the system to complete "
53 "the update"; break;
54 case -1: str = "Not implemented"; break;
55 case -2: str = "Invalid argument"; break;
56 case -3: str = "Call completed with error"; break;
57 case -4: str = "Virtual address not registered"; break;
58 case -5: str = "No information available"; break;
59 case -6: str = "Insufficient space to add the entry"; break;
60 case -7: str = "Invalid entry_addr value"; break;
61 case -8: str = "Invalid interrupt vector"; break;
62 case -9: str = "Requested memory not available"; break;
63 case -10: str = "Unable to write to the NVM device"; break;
64 case -11: str = "Invalid partition type specified"; break;
65 case -12: str = "Invalid NVM_Object id specified"; break;
66 case -13: str = "NVM_Object already has the maximum number "
67 "of partitions"; break;
68 case -14: str = "Insufficient space in partition for the "
69 "requested write sub-function"; break;
70 case -15: str = "Insufficient data buffer space for the "
71 "requested read record sub-function"; break;
72 case -16: str = "Scratch buffer required for the write/delete "
73 "sub-function"; break;
74 case -17: str = "Insufficient space in the NVM_Object for the "
75 "requested create sub-function"; break;
76 case -18: str = "Invalid value specified in the partition_rec "
77 "argument"; break;
78 case -19: str = "Record oriented I/O not supported for this "
79 "partition"; break;
80 case -20: str = "Bad format of record to be written or "
81 "required keyword variable not "
82 "specified"; break;
83 default: str = "Unknown SAL status code"; break;
84 }
85 return str;
86 }
87
88 void __init
ia64_sal_handler_init(void * entry_point,void * gpval)89 ia64_sal_handler_init (void *entry_point, void *gpval)
90 {
91 /* fill in the SAL procedure descriptor and point ia64_sal to it: */
92 pdesc.addr = entry_point;
93 pdesc.gpval = gpval;
94 ia64_sal = (ia64_sal_handler) &pdesc;
95 }
96
97 static void __init
check_versions(struct ia64_sal_systab * systab)98 check_versions (struct ia64_sal_systab *systab)
99 {
100 sal_revision = (systab->sal_rev_major << 8) | systab->sal_rev_minor;
101 sal_version = (systab->sal_b_rev_major << 8) | systab->sal_b_rev_minor;
102
103 /* Check for broken firmware */
104 if ((sal_revision == SAL_VERSION_CODE(49, 29))
105 && (sal_version == SAL_VERSION_CODE(49, 29)))
106 {
107 /*
108 * Old firmware for zx2000 prototypes have this weird version number,
109 * reset it to something sane.
110 */
111 sal_revision = SAL_VERSION_CODE(2, 8);
112 sal_version = SAL_VERSION_CODE(0, 0);
113 }
114 }
115
116 static void __init
sal_desc_entry_point(void * p)117 sal_desc_entry_point (void *p)
118 {
119 struct ia64_sal_desc_entry_point *ep = p;
120 ia64_pal_handler_init(__va(ep->pal_proc));
121 ia64_sal_handler_init(__va(ep->sal_proc), __va(ep->gp));
122 }
123
124 #ifdef CONFIG_SMP
125 static void __init
set_smp_redirect(int flag)126 set_smp_redirect (int flag)
127 {
128 #ifndef CONFIG_HOTPLUG_CPU
129 if (no_int_routing)
130 smp_int_redirect &= ~flag;
131 else
132 smp_int_redirect |= flag;
133 #else
134 /*
135 * For CPU Hotplug we dont want to do any chipset supported
136 * interrupt redirection. The reason is this would require that
137 * All interrupts be stopped and hard bind the irq to a cpu.
138 * Later when the interrupt is fired we need to set the redir hint
139 * on again in the vector. This is cumbersome for something that the
140 * user mode irq balancer will solve anyways.
141 */
142 no_int_routing=1;
143 smp_int_redirect &= ~flag;
144 #endif
145 }
146 #else
147 #define set_smp_redirect(flag) do { } while (0)
148 #endif
149
150 static void __init
sal_desc_platform_feature(void * p)151 sal_desc_platform_feature (void *p)
152 {
153 struct ia64_sal_desc_platform_feature *pf = p;
154 sal_platform_features = pf->feature_mask;
155
156 printk(KERN_INFO "SAL Platform features:");
157 if (!sal_platform_features) {
158 printk(" None\n");
159 return;
160 }
161
162 if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_BUS_LOCK)
163 printk(" BusLock");
164 if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_IRQ_REDIR_HINT) {
165 printk(" IRQ_Redirection");
166 set_smp_redirect(SMP_IRQ_REDIRECTION);
167 }
168 if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_IPI_REDIR_HINT) {
169 printk(" IPI_Redirection");
170 set_smp_redirect(SMP_IPI_REDIRECTION);
171 }
172 if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)
173 printk(" ITC_Drift");
174 printk("\n");
175 }
176
177 #ifdef CONFIG_SMP
178 static void __init
sal_desc_ap_wakeup(void * p)179 sal_desc_ap_wakeup (void *p)
180 {
181 struct ia64_sal_desc_ap_wakeup *ap = p;
182
183 switch (ap->mechanism) {
184 case IA64_SAL_AP_EXTERNAL_INT:
185 ap_wakeup_vector = ap->vector;
186 printk(KERN_INFO "SAL: AP wakeup using external interrupt "
187 "vector 0x%lx\n", ap_wakeup_vector);
188 break;
189 default:
190 printk(KERN_ERR "SAL: AP wakeup mechanism unsupported!\n");
191 break;
192 }
193 }
194
195 static void __init
chk_nointroute_opt(void)196 chk_nointroute_opt(void)
197 {
198 char *cp;
199
200 for (cp = boot_command_line; *cp; ) {
201 if (memcmp(cp, "nointroute", 10) == 0) {
202 no_int_routing = 1;
203 printk ("no_int_routing on\n");
204 break;
205 } else {
206 while (*cp != ' ' && *cp)
207 ++cp;
208 while (*cp == ' ')
209 ++cp;
210 }
211 }
212 }
213
214 #else
sal_desc_ap_wakeup(void * p)215 static void __init sal_desc_ap_wakeup(void *p) { }
216 #endif
217
218 /*
219 * HP rx5670 firmware polls for interrupts during SAL_CACHE_FLUSH by reading
220 * cr.ivr, but it never writes cr.eoi. This leaves any interrupt marked as
221 * "in-service" and masks other interrupts of equal or lower priority.
222 *
223 * HP internal defect reports: F1859, F2775, F3031.
224 */
225 static int sal_cache_flush_drops_interrupts;
226
227 static int __init
force_pal_cache_flush(char * str)228 force_pal_cache_flush(char *str)
229 {
230 sal_cache_flush_drops_interrupts = 1;
231 return 0;
232 }
233 early_param("force_pal_cache_flush", force_pal_cache_flush);
234
235 void __init
check_sal_cache_flush(void)236 check_sal_cache_flush (void)
237 {
238 unsigned long flags;
239 int cpu;
240 u64 vector, cache_type = 3;
241 struct ia64_sal_retval isrv;
242
243 if (sal_cache_flush_drops_interrupts)
244 return;
245
246 cpu = get_cpu();
247 local_irq_save(flags);
248
249 /*
250 * Send ourselves a timer interrupt, wait until it's reported, and see
251 * if SAL_CACHE_FLUSH drops it.
252 */
253 ia64_send_ipi(cpu, IA64_TIMER_VECTOR, IA64_IPI_DM_INT, 0);
254
255 while (!ia64_get_irr(IA64_TIMER_VECTOR))
256 cpu_relax();
257
258 SAL_CALL(isrv, SAL_CACHE_FLUSH, cache_type, 0, 0, 0, 0, 0, 0);
259
260 if (isrv.status)
261 printk(KERN_ERR "SAL_CAL_FLUSH failed with %ld\n", isrv.status);
262
263 if (ia64_get_irr(IA64_TIMER_VECTOR)) {
264 vector = ia64_get_ivr();
265 ia64_eoi();
266 WARN_ON(vector != IA64_TIMER_VECTOR);
267 } else {
268 sal_cache_flush_drops_interrupts = 1;
269 printk(KERN_ERR "SAL: SAL_CACHE_FLUSH drops interrupts; "
270 "PAL_CACHE_FLUSH will be used instead\n");
271 ia64_eoi();
272 }
273
274 local_irq_restore(flags);
275 put_cpu();
276 }
277
278 s64
ia64_sal_cache_flush(u64 cache_type)279 ia64_sal_cache_flush (u64 cache_type)
280 {
281 struct ia64_sal_retval isrv;
282
283 if (sal_cache_flush_drops_interrupts) {
284 unsigned long flags;
285 u64 progress;
286 s64 rc;
287
288 progress = 0;
289 local_irq_save(flags);
290 rc = ia64_pal_cache_flush(cache_type,
291 PAL_CACHE_FLUSH_INVALIDATE, &progress, NULL);
292 local_irq_restore(flags);
293 return rc;
294 }
295
296 SAL_CALL(isrv, SAL_CACHE_FLUSH, cache_type, 0, 0, 0, 0, 0, 0);
297 return isrv.status;
298 }
299 EXPORT_SYMBOL_GPL(ia64_sal_cache_flush);
300
301 void __init
ia64_sal_init(struct ia64_sal_systab * systab)302 ia64_sal_init (struct ia64_sal_systab *systab)
303 {
304 char *p;
305 int i;
306
307 if (!systab) {
308 printk(KERN_WARNING "Hmm, no SAL System Table.\n");
309 return;
310 }
311
312 if (strncmp(systab->signature, "SST_", 4) != 0)
313 printk(KERN_ERR "bad signature in system table!");
314
315 check_versions(systab);
316 #ifdef CONFIG_SMP
317 chk_nointroute_opt();
318 #endif
319
320 /* revisions are coded in BCD, so %x does the job for us */
321 printk(KERN_INFO "SAL %x.%x: %.32s %.32s%sversion %x.%x\n",
322 SAL_MAJOR(sal_revision), SAL_MINOR(sal_revision),
323 systab->oem_id, systab->product_id,
324 systab->product_id[0] ? " " : "",
325 SAL_MAJOR(sal_version), SAL_MINOR(sal_version));
326
327 p = (char *) (systab + 1);
328 for (i = 0; i < systab->entry_count; i++) {
329 /*
330 * The first byte of each entry type contains the type
331 * descriptor.
332 */
333 switch (*p) {
334 case SAL_DESC_ENTRY_POINT:
335 sal_desc_entry_point(p);
336 break;
337 case SAL_DESC_PLATFORM_FEATURE:
338 sal_desc_platform_feature(p);
339 break;
340 case SAL_DESC_PTC:
341 ia64_ptc_domain_info = (ia64_sal_desc_ptc_t *)p;
342 break;
343 case SAL_DESC_AP_WAKEUP:
344 sal_desc_ap_wakeup(p);
345 break;
346 }
347 p += SAL_DESC_SIZE(*p);
348 }
349
350 }
351
352 int
ia64_sal_oemcall(struct ia64_sal_retval * isrvp,u64 oemfunc,u64 arg1,u64 arg2,u64 arg3,u64 arg4,u64 arg5,u64 arg6,u64 arg7)353 ia64_sal_oemcall(struct ia64_sal_retval *isrvp, u64 oemfunc, u64 arg1,
354 u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7)
355 {
356 if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
357 return -1;
358 SAL_CALL(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6, arg7);
359 return 0;
360 }
361 EXPORT_SYMBOL(ia64_sal_oemcall);
362
363 int
ia64_sal_oemcall_nolock(struct ia64_sal_retval * isrvp,u64 oemfunc,u64 arg1,u64 arg2,u64 arg3,u64 arg4,u64 arg5,u64 arg6,u64 arg7)364 ia64_sal_oemcall_nolock(struct ia64_sal_retval *isrvp, u64 oemfunc, u64 arg1,
365 u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6,
366 u64 arg7)
367 {
368 if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
369 return -1;
370 SAL_CALL_NOLOCK(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6,
371 arg7);
372 return 0;
373 }
374 EXPORT_SYMBOL(ia64_sal_oemcall_nolock);
375
376 int
ia64_sal_oemcall_reentrant(struct ia64_sal_retval * isrvp,u64 oemfunc,u64 arg1,u64 arg2,u64 arg3,u64 arg4,u64 arg5,u64 arg6,u64 arg7)377 ia64_sal_oemcall_reentrant(struct ia64_sal_retval *isrvp, u64 oemfunc,
378 u64 arg1, u64 arg2, u64 arg3, u64 arg4, u64 arg5,
379 u64 arg6, u64 arg7)
380 {
381 if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
382 return -1;
383 SAL_CALL_REENTRANT(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6,
384 arg7);
385 return 0;
386 }
387 EXPORT_SYMBOL(ia64_sal_oemcall_reentrant);
388
389 long
ia64_sal_freq_base(unsigned long which,unsigned long * ticks_per_second,unsigned long * drift_info)390 ia64_sal_freq_base (unsigned long which, unsigned long *ticks_per_second,
391 unsigned long *drift_info)
392 {
393 struct ia64_sal_retval isrv;
394
395 SAL_CALL(isrv, SAL_FREQ_BASE, which, 0, 0, 0, 0, 0, 0);
396 *ticks_per_second = isrv.v0;
397 *drift_info = isrv.v1;
398 return isrv.status;
399 }
400 EXPORT_SYMBOL_GPL(ia64_sal_freq_base);
401