Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[sfrench/cifs-2.6.git] / arch / powerpc / platforms / pseries / setup.c
1 /*
2  *  64-bit pSeries and RS/6000 setup code.
3  *
4  *  Copyright (C) 1995  Linus Torvalds
5  *  Adapted from 'alpha' version by Gary Thomas
6  *  Modified by Cort Dougan (cort@cs.nmt.edu)
7  *  Modified by PPC64 Team, IBM Corp
8  *
9  * This program is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU General Public License
11  * as published by the Free Software Foundation; either version
12  * 2 of the License, or (at your option) any later version.
13  */
14
15 /*
16  * bootup setup stuff..
17  */
18
19 #include <linux/cpu.h>
20 #include <linux/errno.h>
21 #include <linux/sched.h>
22 #include <linux/kernel.h>
23 #include <linux/mm.h>
24 #include <linux/stddef.h>
25 #include <linux/unistd.h>
26 #include <linux/user.h>
27 #include <linux/tty.h>
28 #include <linux/major.h>
29 #include <linux/interrupt.h>
30 #include <linux/reboot.h>
31 #include <linux/init.h>
32 #include <linux/ioport.h>
33 #include <linux/console.h>
34 #include <linux/pci.h>
35 #include <linux/utsname.h>
36 #include <linux/adb.h>
37 #include <linux/export.h>
38 #include <linux/delay.h>
39 #include <linux/irq.h>
40 #include <linux/seq_file.h>
41 #include <linux/root_dev.h>
42 #include <linux/of.h>
43 #include <linux/of_pci.h>
44
45 #include <asm/mmu.h>
46 #include <asm/processor.h>
47 #include <asm/io.h>
48 #include <asm/pgtable.h>
49 #include <asm/prom.h>
50 #include <asm/rtas.h>
51 #include <asm/pci-bridge.h>
52 #include <asm/iommu.h>
53 #include <asm/dma.h>
54 #include <asm/machdep.h>
55 #include <asm/irq.h>
56 #include <asm/time.h>
57 #include <asm/nvram.h>
58 #include <asm/pmc.h>
59 #include <asm/xics.h>
60 #include <asm/xive.h>
61 #include <asm/ppc-pci.h>
62 #include <asm/i8259.h>
63 #include <asm/udbg.h>
64 #include <asm/smp.h>
65 #include <asm/firmware.h>
66 #include <asm/eeh.h>
67 #include <asm/reg.h>
68 #include <asm/plpar_wrappers.h>
69 #include <asm/kexec.h>
70 #include <asm/isa-bridge.h>
71
72 #include "pseries.h"
73
74 int CMO_PrPSP = -1;
75 int CMO_SecPSP = -1;
76 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT_4K);
77 EXPORT_SYMBOL(CMO_PageSize);
78
79 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
80
81 static void pSeries_show_cpuinfo(struct seq_file *m)
82 {
83         struct device_node *root;
84         const char *model = "";
85
86         root = of_find_node_by_path("/");
87         if (root)
88                 model = of_get_property(root, "model", NULL);
89         seq_printf(m, "machine\t\t: CHRP %s\n", model);
90         of_node_put(root);
91         if (radix_enabled())
92                 seq_printf(m, "MMU\t\t: Radix\n");
93         else
94                 seq_printf(m, "MMU\t\t: Hash\n");
95 }
96
97 /* Initialize firmware assisted non-maskable interrupts if
98  * the firmware supports this feature.
99  */
100 static void __init fwnmi_init(void)
101 {
102         unsigned long system_reset_addr, machine_check_addr;
103
104         int ibm_nmi_register = rtas_token("ibm,nmi-register");
105         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
106                 return;
107
108         /* If the kernel's not linked at zero we point the firmware at low
109          * addresses anyway, and use a trampoline to get to the real code. */
110         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
111         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
112
113         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
114                                 machine_check_addr))
115                 fwnmi_active = 1;
116 }
117
118 static void pseries_8259_cascade(struct irq_desc *desc)
119 {
120         struct irq_chip *chip = irq_desc_get_chip(desc);
121         unsigned int cascade_irq = i8259_irq();
122
123         if (cascade_irq)
124                 generic_handle_irq(cascade_irq);
125
126         chip->irq_eoi(&desc->irq_data);
127 }
128
129 static void __init pseries_setup_i8259_cascade(void)
130 {
131         struct device_node *np, *old, *found = NULL;
132         unsigned int cascade;
133         const u32 *addrp;
134         unsigned long intack = 0;
135         int naddr;
136
137         for_each_node_by_type(np, "interrupt-controller") {
138                 if (of_device_is_compatible(np, "chrp,iic")) {
139                         found = np;
140                         break;
141                 }
142         }
143
144         if (found == NULL) {
145                 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
146                 return;
147         }
148
149         cascade = irq_of_parse_and_map(found, 0);
150         if (!cascade) {
151                 printk(KERN_ERR "pic: failed to map cascade interrupt");
152                 return;
153         }
154         pr_debug("pic: cascade mapped to irq %d\n", cascade);
155
156         for (old = of_node_get(found); old != NULL ; old = np) {
157                 np = of_get_parent(old);
158                 of_node_put(old);
159                 if (np == NULL)
160                         break;
161                 if (strcmp(np->name, "pci") != 0)
162                         continue;
163                 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
164                 if (addrp == NULL)
165                         continue;
166                 naddr = of_n_addr_cells(np);
167                 intack = addrp[naddr-1];
168                 if (naddr > 1)
169                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
170         }
171         if (intack)
172                 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
173         i8259_init(found, intack);
174         of_node_put(found);
175         irq_set_chained_handler(cascade, pseries_8259_cascade);
176 }
177
178 static void __init pseries_init_irq(void)
179 {
180         /* Try using a XIVE if available, otherwise use a XICS */
181         if (!xive_spapr_init()) {
182                 xics_init();
183                 pseries_setup_i8259_cascade();
184         }
185 }
186
187 static void pseries_lpar_enable_pmcs(void)
188 {
189         unsigned long set, reset;
190
191         set = 1UL << 63;
192         reset = 0;
193         plpar_hcall_norets(H_PERFMON, set, reset);
194 }
195
196 static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *data)
197 {
198         struct of_reconfig_data *rd = data;
199         struct device_node *parent, *np = rd->dn;
200         struct pci_dn *pdn;
201         int err = NOTIFY_OK;
202
203         switch (action) {
204         case OF_RECONFIG_ATTACH_NODE:
205                 parent = of_get_parent(np);
206                 pdn = parent ? PCI_DN(parent) : NULL;
207                 if (pdn)
208                         pci_add_device_node_info(pdn->phb, np);
209
210                 of_node_put(parent);
211                 break;
212         case OF_RECONFIG_DETACH_NODE:
213                 pdn = PCI_DN(np);
214                 if (pdn)
215                         list_del(&pdn->list);
216                 break;
217         default:
218                 err = NOTIFY_DONE;
219                 break;
220         }
221         return err;
222 }
223
224 static struct notifier_block pci_dn_reconfig_nb = {
225         .notifier_call = pci_dn_reconfig_notifier,
226 };
227
228 struct kmem_cache *dtl_cache;
229
230 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
231 /*
232  * Allocate space for the dispatch trace log for all possible cpus
233  * and register the buffers with the hypervisor.  This is used for
234  * computing time stolen by the hypervisor.
235  */
236 static int alloc_dispatch_logs(void)
237 {
238         int cpu, ret;
239         struct paca_struct *pp;
240         struct dtl_entry *dtl;
241
242         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
243                 return 0;
244
245         if (!dtl_cache)
246                 return 0;
247
248         for_each_possible_cpu(cpu) {
249                 pp = &paca[cpu];
250                 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
251                 if (!dtl) {
252                         pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
253                                 cpu);
254                         pr_warn("Stolen time statistics will be unreliable\n");
255                         break;
256                 }
257
258                 pp->dtl_ridx = 0;
259                 pp->dispatch_log = dtl;
260                 pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
261                 pp->dtl_curr = dtl;
262         }
263
264         /* Register the DTL for the current (boot) cpu */
265         dtl = get_paca()->dispatch_log;
266         get_paca()->dtl_ridx = 0;
267         get_paca()->dtl_curr = dtl;
268         get_paca()->lppaca_ptr->dtl_idx = 0;
269
270         /* hypervisor reads buffer length from this field */
271         dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
272         ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
273         if (ret)
274                 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
275                        "with %d\n", smp_processor_id(),
276                        hard_smp_processor_id(), ret);
277         get_paca()->lppaca_ptr->dtl_enable_mask = 2;
278
279         return 0;
280 }
281 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
282 static inline int alloc_dispatch_logs(void)
283 {
284         return 0;
285 }
286 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
287
288 static int alloc_dispatch_log_kmem_cache(void)
289 {
290         dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
291                                                 DISPATCH_LOG_BYTES, 0, NULL);
292         if (!dtl_cache) {
293                 pr_warn("Failed to create dispatch trace log buffer cache\n");
294                 pr_warn("Stolen time statistics will be unreliable\n");
295                 return 0;
296         }
297
298         return alloc_dispatch_logs();
299 }
300 machine_early_initcall(pseries, alloc_dispatch_log_kmem_cache);
301
302 static void pseries_lpar_idle(void)
303 {
304         /*
305          * Default handler to go into low thread priority and possibly
306          * low power mode by ceding processor to hypervisor
307          */
308
309         /* Indicate to hypervisor that we are idle. */
310         get_lppaca()->idle = 1;
311
312         /*
313          * Yield the processor to the hypervisor.  We return if
314          * an external interrupt occurs (which are driven prior
315          * to returning here) or if a prod occurs from another
316          * processor. When returning here, external interrupts
317          * are enabled.
318          */
319         cede_processor();
320
321         get_lppaca()->idle = 0;
322 }
323
324 /*
325  * Enable relocation on during exceptions. This has partition wide scope and
326  * may take a while to complete, if it takes longer than one second we will
327  * just give up rather than wasting any more time on this - if that turns out
328  * to ever be a problem in practice we can move this into a kernel thread to
329  * finish off the process later in boot.
330  */
331 void pseries_enable_reloc_on_exc(void)
332 {
333         long rc;
334         unsigned int delay, total_delay = 0;
335
336         while (1) {
337                 rc = enable_reloc_on_exceptions();
338                 if (!H_IS_LONG_BUSY(rc)) {
339                         if (rc == H_P2) {
340                                 pr_info("Relocation on exceptions not"
341                                         " supported\n");
342                         } else if (rc != H_SUCCESS) {
343                                 pr_warn("Unable to enable relocation"
344                                         " on exceptions: %ld\n", rc);
345                         }
346                         break;
347                 }
348
349                 delay = get_longbusy_msecs(rc);
350                 total_delay += delay;
351                 if (total_delay > 1000) {
352                         pr_warn("Warning: Giving up waiting to enable "
353                                 "relocation on exceptions (%u msec)!\n",
354                                 total_delay);
355                         return;
356                 }
357
358                 mdelay(delay);
359         }
360 }
361 EXPORT_SYMBOL(pseries_enable_reloc_on_exc);
362
363 void pseries_disable_reloc_on_exc(void)
364 {
365         long rc;
366
367         while (1) {
368                 rc = disable_reloc_on_exceptions();
369                 if (!H_IS_LONG_BUSY(rc))
370                         break;
371                 mdelay(get_longbusy_msecs(rc));
372         }
373         if (rc != H_SUCCESS)
374                 pr_warning("Warning: Failed to disable relocation on "
375                            "exceptions: %ld\n", rc);
376 }
377 EXPORT_SYMBOL(pseries_disable_reloc_on_exc);
378
379 #ifdef CONFIG_KEXEC_CORE
380 static void pSeries_machine_kexec(struct kimage *image)
381 {
382         if (firmware_has_feature(FW_FEATURE_SET_MODE))
383                 pseries_disable_reloc_on_exc();
384
385         default_machine_kexec(image);
386 }
387 #endif
388
389 #ifdef __LITTLE_ENDIAN__
390 void pseries_big_endian_exceptions(void)
391 {
392         long rc;
393
394         while (1) {
395                 rc = enable_big_endian_exceptions();
396                 if (!H_IS_LONG_BUSY(rc))
397                         break;
398                 mdelay(get_longbusy_msecs(rc));
399         }
400
401         /*
402          * At this point it is unlikely panic() will get anything
403          * out to the user, since this is called very late in kexec
404          * but at least this will stop us from continuing on further
405          * and creating an even more difficult to debug situation.
406          *
407          * There is a known problem when kdump'ing, if cpus are offline
408          * the above call will fail. Rather than panicking again, keep
409          * going and hope the kdump kernel is also little endian, which
410          * it usually is.
411          */
412         if (rc && !kdump_in_progress())
413                 panic("Could not enable big endian exceptions");
414 }
415
416 void pseries_little_endian_exceptions(void)
417 {
418         long rc;
419
420         while (1) {
421                 rc = enable_little_endian_exceptions();
422                 if (!H_IS_LONG_BUSY(rc))
423                         break;
424                 mdelay(get_longbusy_msecs(rc));
425         }
426         if (rc) {
427                 ppc_md.progress("H_SET_MODE LE exception fail", 0);
428                 panic("Could not enable little endian exceptions");
429         }
430 }
431 #endif
432
433 static void __init find_and_init_phbs(void)
434 {
435         struct device_node *node;
436         struct pci_controller *phb;
437         struct device_node *root = of_find_node_by_path("/");
438
439         for_each_child_of_node(root, node) {
440                 if (node->type == NULL || (strcmp(node->type, "pci") != 0 &&
441                                            strcmp(node->type, "pciex") != 0))
442                         continue;
443
444                 phb = pcibios_alloc_controller(node);
445                 if (!phb)
446                         continue;
447                 rtas_setup_phb(phb);
448                 pci_process_bridge_OF_ranges(phb, node, 0);
449                 isa_bridge_find_early(phb);
450                 phb->controller_ops = pseries_pci_controller_ops;
451         }
452
453         of_node_put(root);
454
455         /*
456          * PCI_PROBE_ONLY and PCI_REASSIGN_ALL_BUS can be set via properties
457          * in chosen.
458          */
459         of_pci_check_probe_only();
460 }
461
462 static void pseries_setup_rfi_flush(void)
463 {
464         struct h_cpu_char_result result;
465         enum l1d_flush_type types;
466         bool enable;
467         long rc;
468
469         /* Enable by default */
470         enable = true;
471
472         rc = plpar_get_cpu_characteristics(&result);
473         if (rc == H_SUCCESS) {
474                 types = L1D_FLUSH_NONE;
475
476                 if (result.character & H_CPU_CHAR_L1D_FLUSH_TRIG2)
477                         types |= L1D_FLUSH_MTTRIG;
478                 if (result.character & H_CPU_CHAR_L1D_FLUSH_ORI30)
479                         types |= L1D_FLUSH_ORI;
480
481                 /* Use fallback if nothing set in hcall */
482                 if (types == L1D_FLUSH_NONE)
483                         types = L1D_FLUSH_FALLBACK;
484
485                 if (!(result.behaviour & H_CPU_BEHAV_L1D_FLUSH_PR))
486                         enable = false;
487         } else {
488                 /* Default to fallback if case hcall is not available */
489                 types = L1D_FLUSH_FALLBACK;
490         }
491
492         setup_rfi_flush(types, enable);
493 }
494
495 static void __init pSeries_setup_arch(void)
496 {
497         set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
498
499         /* Discover PIC type and setup ppc_md accordingly */
500         smp_init_pseries();
501
502
503         /* openpic global configuration register (64-bit format). */
504         /* openpic Interrupt Source Unit pointer (64-bit format). */
505         /* python0 facility area (mmio) (64-bit format) REAL address. */
506
507         /* init to some ~sane value until calibrate_delay() runs */
508         loops_per_jiffy = 50000000;
509
510         fwnmi_init();
511
512         pseries_setup_rfi_flush();
513
514         /* By default, only probe PCI (can be overridden by rtas_pci) */
515         pci_add_flags(PCI_PROBE_ONLY);
516
517         /* Find and initialize PCI host bridges */
518         init_pci_config_tokens();
519         find_and_init_phbs();
520         of_reconfig_notifier_register(&pci_dn_reconfig_nb);
521
522         pSeries_nvram_init();
523
524         if (firmware_has_feature(FW_FEATURE_LPAR)) {
525                 vpa_init(boot_cpuid);
526                 ppc_md.power_save = pseries_lpar_idle;
527                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
528         } else {
529                 /* No special idle routine */
530                 ppc_md.enable_pmcs = power4_enable_pmcs;
531         }
532
533         ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
534 }
535
536 static int __init pSeries_init_panel(void)
537 {
538         /* Manually leave the kernel version on the panel. */
539 #ifdef __BIG_ENDIAN__
540         ppc_md.progress("Linux ppc64\n", 0);
541 #else
542         ppc_md.progress("Linux ppc64le\n", 0);
543 #endif
544         ppc_md.progress(init_utsname()->version, 0);
545
546         return 0;
547 }
548 machine_arch_initcall(pseries, pSeries_init_panel);
549
550 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
551 {
552         return plpar_hcall_norets(H_SET_DABR, dabr);
553 }
554
555 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
556 {
557         /* Have to set at least one bit in the DABRX according to PAPR */
558         if (dabrx == 0 && dabr == 0)
559                 dabrx = DABRX_USER;
560         /* PAPR says we can only set kernel and user bits */
561         dabrx &= DABRX_KERNEL | DABRX_USER;
562
563         return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
564 }
565
566 static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx)
567 {
568         /* PAPR says we can't set HYP */
569         dawrx &= ~DAWRX_HYP;
570
571         return  plapr_set_watchpoint0(dawr, dawrx);
572 }
573
574 #define CMO_CHARACTERISTICS_TOKEN 44
575 #define CMO_MAXLENGTH 1026
576
577 void pSeries_coalesce_init(void)
578 {
579         struct hvcall_mpp_x_data mpp_x_data;
580
581         if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
582                 powerpc_firmware_features |= FW_FEATURE_XCMO;
583         else
584                 powerpc_firmware_features &= ~FW_FEATURE_XCMO;
585 }
586
587 /**
588  * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
589  * handle that here. (Stolen from parse_system_parameter_string)
590  */
591 static void pSeries_cmo_feature_init(void)
592 {
593         char *ptr, *key, *value, *end;
594         int call_status;
595         int page_order = IOMMU_PAGE_SHIFT_4K;
596
597         pr_debug(" -> fw_cmo_feature_init()\n");
598         spin_lock(&rtas_data_buf_lock);
599         memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
600         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
601                                 NULL,
602                                 CMO_CHARACTERISTICS_TOKEN,
603                                 __pa(rtas_data_buf),
604                                 RTAS_DATA_BUF_SIZE);
605
606         if (call_status != 0) {
607                 spin_unlock(&rtas_data_buf_lock);
608                 pr_debug("CMO not available\n");
609                 pr_debug(" <- fw_cmo_feature_init()\n");
610                 return;
611         }
612
613         end = rtas_data_buf + CMO_MAXLENGTH - 2;
614         ptr = rtas_data_buf + 2;        /* step over strlen value */
615         key = value = ptr;
616
617         while (*ptr && (ptr <= end)) {
618                 /* Separate the key and value by replacing '=' with '\0' and
619                  * point the value at the string after the '='
620                  */
621                 if (ptr[0] == '=') {
622                         ptr[0] = '\0';
623                         value = ptr + 1;
624                 } else if (ptr[0] == '\0' || ptr[0] == ',') {
625                         /* Terminate the string containing the key/value pair */
626                         ptr[0] = '\0';
627
628                         if (key == value) {
629                                 pr_debug("Malformed key/value pair\n");
630                                 /* Never found a '=', end processing */
631                                 break;
632                         }
633
634                         if (0 == strcmp(key, "CMOPageSize"))
635                                 page_order = simple_strtol(value, NULL, 10);
636                         else if (0 == strcmp(key, "PrPSP"))
637                                 CMO_PrPSP = simple_strtol(value, NULL, 10);
638                         else if (0 == strcmp(key, "SecPSP"))
639                                 CMO_SecPSP = simple_strtol(value, NULL, 10);
640                         value = key = ptr + 1;
641                 }
642                 ptr++;
643         }
644
645         /* Page size is returned as the power of 2 of the page size,
646          * convert to the page size in bytes before returning
647          */
648         CMO_PageSize = 1 << page_order;
649         pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
650
651         if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
652                 pr_info("CMO enabled\n");
653                 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
654                          CMO_SecPSP);
655                 powerpc_firmware_features |= FW_FEATURE_CMO;
656                 pSeries_coalesce_init();
657         } else
658                 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
659                          CMO_SecPSP);
660         spin_unlock(&rtas_data_buf_lock);
661         pr_debug(" <- fw_cmo_feature_init()\n");
662 }
663
664 /*
665  * Early initialization.  Relocation is on but do not reference unbolted pages
666  */
667 static void __init pseries_init(void)
668 {
669         pr_debug(" -> pseries_init()\n");
670
671 #ifdef CONFIG_HVC_CONSOLE
672         if (firmware_has_feature(FW_FEATURE_LPAR))
673                 hvc_vio_init_early();
674 #endif
675         if (firmware_has_feature(FW_FEATURE_XDABR))
676                 ppc_md.set_dabr = pseries_set_xdabr;
677         else if (firmware_has_feature(FW_FEATURE_DABR))
678                 ppc_md.set_dabr = pseries_set_dabr;
679
680         if (firmware_has_feature(FW_FEATURE_SET_MODE))
681                 ppc_md.set_dawr = pseries_set_dawr;
682
683         pSeries_cmo_feature_init();
684         iommu_init_early_pSeries();
685
686         pr_debug(" <- pseries_init()\n");
687 }
688
689 /**
690  * pseries_power_off - tell firmware about how to power off the system.
691  *
692  * This function calls either the power-off rtas token in normal cases
693  * or the ibm,power-off-ups token (if present & requested) in case of
694  * a power failure. If power-off token is used, power on will only be
695  * possible with power button press. If ibm,power-off-ups token is used
696  * it will allow auto poweron after power is restored.
697  */
698 static void pseries_power_off(void)
699 {
700         int rc;
701         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
702
703         if (rtas_flash_term_hook)
704                 rtas_flash_term_hook(SYS_POWER_OFF);
705
706         if (rtas_poweron_auto == 0 ||
707                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
708                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
709                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
710         } else {
711                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
712                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
713         }
714         for (;;);
715 }
716
717 static int __init pSeries_probe(void)
718 {
719         const char *dtype = of_get_property(of_root, "device_type", NULL);
720
721         if (dtype == NULL)
722                 return 0;
723         if (strcmp(dtype, "chrp"))
724                 return 0;
725
726         /* Cell blades firmware claims to be chrp while it's not. Until this
727          * is fixed, we need to avoid those here.
728          */
729         if (of_machine_is_compatible("IBM,CPBW-1.0") ||
730             of_machine_is_compatible("IBM,CBEA"))
731                 return 0;
732
733         pm_power_off = pseries_power_off;
734
735         pr_debug("Machine is%s LPAR !\n",
736                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
737
738         pseries_init();
739
740         return 1;
741 }
742
743 static int pSeries_pci_probe_mode(struct pci_bus *bus)
744 {
745         if (firmware_has_feature(FW_FEATURE_LPAR))
746                 return PCI_PROBE_DEVTREE;
747         return PCI_PROBE_NORMAL;
748 }
749
750 struct pci_controller_ops pseries_pci_controller_ops = {
751         .probe_mode             = pSeries_pci_probe_mode,
752 };
753
754 define_machine(pseries) {
755         .name                   = "pSeries",
756         .probe                  = pSeries_probe,
757         .setup_arch             = pSeries_setup_arch,
758         .init_IRQ               = pseries_init_irq,
759         .show_cpuinfo           = pSeries_show_cpuinfo,
760         .log_error              = pSeries_log_error,
761         .pcibios_fixup          = pSeries_final_fixup,
762         .restart                = rtas_restart,
763         .halt                   = rtas_halt,
764         .panic                  = rtas_os_term,
765         .get_boot_time          = rtas_get_boot_time,
766         .get_rtc_time           = rtas_get_rtc_time,
767         .set_rtc_time           = rtas_set_rtc_time,
768         .calibrate_decr         = generic_calibrate_decr,
769         .progress               = rtas_progress,
770         .system_reset_exception = pSeries_system_reset_exception,
771         .machine_check_exception = pSeries_machine_check_exception,
772 #ifdef CONFIG_KEXEC_CORE
773         .machine_kexec          = pSeries_machine_kexec,
774         .kexec_cpu_down         = pseries_kexec_cpu_down,
775 #endif
776 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
777         .memory_block_size      = pseries_memory_block_size,
778 #endif
779 };