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TOMOYO Linux Cross Reference
Linux/arch/powerpc/platforms/pseries/setup.c

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  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/kexec.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/mpic.h>
 60 #include <asm/xics.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 
 70 #include "pseries.h"
 71 
 72 int CMO_PrPSP = -1;
 73 int CMO_SecPSP = -1;
 74 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT_4K);
 75 EXPORT_SYMBOL(CMO_PageSize);
 76 
 77 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
 78 
 79 static struct device_node *pSeries_mpic_node;
 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 }
 92 
 93 /* Initialize firmware assisted non-maskable interrupts if
 94  * the firmware supports this feature.
 95  */
 96 static void __init fwnmi_init(void)
 97 {
 98         unsigned long system_reset_addr, machine_check_addr;
 99 
100         int ibm_nmi_register = rtas_token("ibm,nmi-register");
101         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
102                 return;
103 
104         /* If the kernel's not linked at zero we point the firmware at low
105          * addresses anyway, and use a trampoline to get to the real code. */
106         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
107         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
108 
109         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
110                                 machine_check_addr))
111                 fwnmi_active = 1;
112 }
113 
114 static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
115 {
116         struct irq_chip *chip = irq_desc_get_chip(desc);
117         unsigned int cascade_irq = i8259_irq();
118 
119         if (cascade_irq != NO_IRQ)
120                 generic_handle_irq(cascade_irq);
121 
122         chip->irq_eoi(&desc->irq_data);
123 }
124 
125 static void __init pseries_setup_i8259_cascade(void)
126 {
127         struct device_node *np, *old, *found = NULL;
128         unsigned int cascade;
129         const u32 *addrp;
130         unsigned long intack = 0;
131         int naddr;
132 
133         for_each_node_by_type(np, "interrupt-controller") {
134                 if (of_device_is_compatible(np, "chrp,iic")) {
135                         found = np;
136                         break;
137                 }
138         }
139 
140         if (found == NULL) {
141                 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
142                 return;
143         }
144 
145         cascade = irq_of_parse_and_map(found, 0);
146         if (cascade == NO_IRQ) {
147                 printk(KERN_ERR "pic: failed to map cascade interrupt");
148                 return;
149         }
150         pr_debug("pic: cascade mapped to irq %d\n", cascade);
151 
152         for (old = of_node_get(found); old != NULL ; old = np) {
153                 np = of_get_parent(old);
154                 of_node_put(old);
155                 if (np == NULL)
156                         break;
157                 if (strcmp(np->name, "pci") != 0)
158                         continue;
159                 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
160                 if (addrp == NULL)
161                         continue;
162                 naddr = of_n_addr_cells(np);
163                 intack = addrp[naddr-1];
164                 if (naddr > 1)
165                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
166         }
167         if (intack)
168                 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
169         i8259_init(found, intack);
170         of_node_put(found);
171         irq_set_chained_handler(cascade, pseries_8259_cascade);
172 }
173 
174 static void __init pseries_mpic_init_IRQ(void)
175 {
176         struct device_node *np;
177         const unsigned int *opprop;
178         unsigned long openpic_addr = 0;
179         int naddr, n, i, opplen;
180         struct mpic *mpic;
181 
182         np = of_find_node_by_path("/");
183         naddr = of_n_addr_cells(np);
184         opprop = of_get_property(np, "platform-open-pic", &opplen);
185         if (opprop != NULL) {
186                 openpic_addr = of_read_number(opprop, naddr);
187                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
188         }
189         of_node_put(np);
190 
191         BUG_ON(openpic_addr == 0);
192 
193         /* Setup the openpic driver */
194         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
195                         MPIC_NO_RESET, 16, 0, " MPIC     ");
196         BUG_ON(mpic == NULL);
197 
198         /* Add ISUs */
199         opplen /= sizeof(u32);
200         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
201                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
202                 mpic_assign_isu(mpic, n, isuaddr);
203         }
204 
205         /* Setup top-level get_irq */
206         ppc_md.get_irq = mpic_get_irq;
207 
208         /* All ISUs are setup, complete initialization */
209         mpic_init(mpic);
210 
211         /* Look for cascade */
212         pseries_setup_i8259_cascade();
213 }
214 
215 static void __init pseries_xics_init_IRQ(void)
216 {
217         xics_init();
218         pseries_setup_i8259_cascade();
219 }
220 
221 static void pseries_lpar_enable_pmcs(void)
222 {
223         unsigned long set, reset;
224 
225         set = 1UL << 63;
226         reset = 0;
227         plpar_hcall_norets(H_PERFMON, set, reset);
228 }
229 
230 static void __init pseries_discover_pic(void)
231 {
232         struct device_node *np;
233         const char *typep;
234 
235         for (np = NULL; (np = of_find_node_by_name(np,
236                                                    "interrupt-controller"));) {
237                 typep = of_get_property(np, "compatible", NULL);
238                 if (strstr(typep, "open-pic")) {
239                         pSeries_mpic_node = of_node_get(np);
240                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
241                         setup_kexec_cpu_down_mpic();
242                         smp_init_pseries_mpic();
243                         return;
244                 } else if (strstr(typep, "ppc-xicp")) {
245                         ppc_md.init_IRQ       = pseries_xics_init_IRQ;
246                         setup_kexec_cpu_down_xics();
247                         smp_init_pseries_xics();
248                         return;
249                 }
250         }
251         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
252                " interrupt-controller\n");
253 }
254 
255 static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node)
256 {
257         struct device_node *np = node;
258         struct pci_dn *pci = NULL;
259         int err = NOTIFY_OK;
260 
261         switch (action) {
262         case OF_RECONFIG_ATTACH_NODE:
263                 pci = np->parent->data;
264                 if (pci) {
265                         update_dn_pci_info(np, pci->phb);
266 
267                         /* Create EEH device for the OF node */
268                         eeh_dev_init(np, pci->phb);
269                 }
270                 break;
271         default:
272                 err = NOTIFY_DONE;
273                 break;
274         }
275         return err;
276 }
277 
278 static struct notifier_block pci_dn_reconfig_nb = {
279         .notifier_call = pci_dn_reconfig_notifier,
280 };
281 
282 struct kmem_cache *dtl_cache;
283 
284 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
285 /*
286  * Allocate space for the dispatch trace log for all possible cpus
287  * and register the buffers with the hypervisor.  This is used for
288  * computing time stolen by the hypervisor.
289  */
290 static int alloc_dispatch_logs(void)
291 {
292         int cpu, ret;
293         struct paca_struct *pp;
294         struct dtl_entry *dtl;
295 
296         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
297                 return 0;
298 
299         if (!dtl_cache)
300                 return 0;
301 
302         for_each_possible_cpu(cpu) {
303                 pp = &paca[cpu];
304                 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
305                 if (!dtl) {
306                         pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
307                                 cpu);
308                         pr_warn("Stolen time statistics will be unreliable\n");
309                         break;
310                 }
311 
312                 pp->dtl_ridx = 0;
313                 pp->dispatch_log = dtl;
314                 pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
315                 pp->dtl_curr = dtl;
316         }
317 
318         /* Register the DTL for the current (boot) cpu */
319         dtl = get_paca()->dispatch_log;
320         get_paca()->dtl_ridx = 0;
321         get_paca()->dtl_curr = dtl;
322         get_paca()->lppaca_ptr->dtl_idx = 0;
323 
324         /* hypervisor reads buffer length from this field */
325         dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
326         ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
327         if (ret)
328                 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
329                        "with %d\n", smp_processor_id(),
330                        hard_smp_processor_id(), ret);
331         get_paca()->lppaca_ptr->dtl_enable_mask = 2;
332 
333         return 0;
334 }
335 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
336 static inline int alloc_dispatch_logs(void)
337 {
338         return 0;
339 }
340 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
341 
342 static int alloc_dispatch_log_kmem_cache(void)
343 {
344         dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
345                                                 DISPATCH_LOG_BYTES, 0, NULL);
346         if (!dtl_cache) {
347                 pr_warn("Failed to create dispatch trace log buffer cache\n");
348                 pr_warn("Stolen time statistics will be unreliable\n");
349                 return 0;
350         }
351 
352         return alloc_dispatch_logs();
353 }
354 early_initcall(alloc_dispatch_log_kmem_cache);
355 
356 static void pseries_lpar_idle(void)
357 {
358         /*
359          * Default handler to go into low thread priority and possibly
360          * low power mode by cedeing processor to hypervisor
361          */
362 
363         /* Indicate to hypervisor that we are idle. */
364         get_lppaca()->idle = 1;
365 
366         /*
367          * Yield the processor to the hypervisor.  We return if
368          * an external interrupt occurs (which are driven prior
369          * to returning here) or if a prod occurs from another
370          * processor. When returning here, external interrupts
371          * are enabled.
372          */
373         cede_processor();
374 
375         get_lppaca()->idle = 0;
376 }
377 
378 /*
379  * Enable relocation on during exceptions. This has partition wide scope and
380  * may take a while to complete, if it takes longer than one second we will
381  * just give up rather than wasting any more time on this - if that turns out
382  * to ever be a problem in practice we can move this into a kernel thread to
383  * finish off the process later in boot.
384  */
385 long pSeries_enable_reloc_on_exc(void)
386 {
387         long rc;
388         unsigned int delay, total_delay = 0;
389 
390         while (1) {
391                 rc = enable_reloc_on_exceptions();
392                 if (!H_IS_LONG_BUSY(rc))
393                         return rc;
394 
395                 delay = get_longbusy_msecs(rc);
396                 total_delay += delay;
397                 if (total_delay > 1000) {
398                         pr_warn("Warning: Giving up waiting to enable "
399                                 "relocation on exceptions (%u msec)!\n",
400                                 total_delay);
401                         return rc;
402                 }
403 
404                 mdelay(delay);
405         }
406 }
407 EXPORT_SYMBOL(pSeries_enable_reloc_on_exc);
408 
409 long pSeries_disable_reloc_on_exc(void)
410 {
411         long rc;
412 
413         while (1) {
414                 rc = disable_reloc_on_exceptions();
415                 if (!H_IS_LONG_BUSY(rc))
416                         return rc;
417                 mdelay(get_longbusy_msecs(rc));
418         }
419 }
420 EXPORT_SYMBOL(pSeries_disable_reloc_on_exc);
421 
422 #ifdef CONFIG_KEXEC
423 static void pSeries_machine_kexec(struct kimage *image)
424 {
425         long rc;
426 
427         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
428                 rc = pSeries_disable_reloc_on_exc();
429                 if (rc != H_SUCCESS)
430                         pr_warning("Warning: Failed to disable relocation on "
431                                    "exceptions: %ld\n", rc);
432         }
433 
434         default_machine_kexec(image);
435 }
436 #endif
437 
438 #ifdef __LITTLE_ENDIAN__
439 long pseries_big_endian_exceptions(void)
440 {
441         long rc;
442 
443         while (1) {
444                 rc = enable_big_endian_exceptions();
445                 if (!H_IS_LONG_BUSY(rc))
446                         return rc;
447                 mdelay(get_longbusy_msecs(rc));
448         }
449 }
450 
451 static long pseries_little_endian_exceptions(void)
452 {
453         long rc;
454 
455         while (1) {
456                 rc = enable_little_endian_exceptions();
457                 if (!H_IS_LONG_BUSY(rc))
458                         return rc;
459                 mdelay(get_longbusy_msecs(rc));
460         }
461 }
462 #endif
463 
464 static void __init pSeries_setup_arch(void)
465 {
466         set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
467 
468         /* Discover PIC type and setup ppc_md accordingly */
469         pseries_discover_pic();
470 
471         /* openpic global configuration register (64-bit format). */
472         /* openpic Interrupt Source Unit pointer (64-bit format). */
473         /* python0 facility area (mmio) (64-bit format) REAL address. */
474 
475         /* init to some ~sane value until calibrate_delay() runs */
476         loops_per_jiffy = 50000000;
477 
478         fwnmi_init();
479 
480         /* By default, only probe PCI (can be overriden by rtas_pci) */
481         pci_add_flags(PCI_PROBE_ONLY);
482 
483         /* Find and initialize PCI host bridges */
484         init_pci_config_tokens();
485         find_and_init_phbs();
486         of_reconfig_notifier_register(&pci_dn_reconfig_nb);
487 
488         pSeries_nvram_init();
489 
490         if (firmware_has_feature(FW_FEATURE_LPAR)) {
491                 vpa_init(boot_cpuid);
492                 ppc_md.power_save = pseries_lpar_idle;
493                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
494         } else {
495                 /* No special idle routine */
496                 ppc_md.enable_pmcs = power4_enable_pmcs;
497         }
498 
499         ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
500 
501         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
502                 long rc;
503                 if ((rc = pSeries_enable_reloc_on_exc()) != H_SUCCESS) {
504                         pr_warn("Unable to enable relocation on exceptions: "
505                                 "%ld\n", rc);
506                 }
507         }
508 }
509 
510 static int __init pSeries_init_panel(void)
511 {
512         /* Manually leave the kernel version on the panel. */
513         ppc_md.progress("Linux ppc64\n", 0);
514         ppc_md.progress(init_utsname()->version, 0);
515 
516         return 0;
517 }
518 machine_arch_initcall(pseries, pSeries_init_panel);
519 
520 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
521 {
522         return plpar_hcall_norets(H_SET_DABR, dabr);
523 }
524 
525 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
526 {
527         /* Have to set at least one bit in the DABRX according to PAPR */
528         if (dabrx == 0 && dabr == 0)
529                 dabrx = DABRX_USER;
530         /* PAPR says we can only set kernel and user bits */
531         dabrx &= DABRX_KERNEL | DABRX_USER;
532 
533         return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
534 }
535 
536 static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx)
537 {
538         /* PAPR says we can't set HYP */
539         dawrx &= ~DAWRX_HYP;
540 
541         return  plapr_set_watchpoint0(dawr, dawrx);
542 }
543 
544 #define CMO_CHARACTERISTICS_TOKEN 44
545 #define CMO_MAXLENGTH 1026
546 
547 void pSeries_coalesce_init(void)
548 {
549         struct hvcall_mpp_x_data mpp_x_data;
550 
551         if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
552                 powerpc_firmware_features |= FW_FEATURE_XCMO;
553         else
554                 powerpc_firmware_features &= ~FW_FEATURE_XCMO;
555 }
556 
557 /**
558  * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
559  * handle that here. (Stolen from parse_system_parameter_string)
560  */
561 void pSeries_cmo_feature_init(void)
562 {
563         char *ptr, *key, *value, *end;
564         int call_status;
565         int page_order = IOMMU_PAGE_SHIFT_4K;
566 
567         pr_debug(" -> fw_cmo_feature_init()\n");
568         spin_lock(&rtas_data_buf_lock);
569         memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
570         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
571                                 NULL,
572                                 CMO_CHARACTERISTICS_TOKEN,
573                                 __pa(rtas_data_buf),
574                                 RTAS_DATA_BUF_SIZE);
575 
576         if (call_status != 0) {
577                 spin_unlock(&rtas_data_buf_lock);
578                 pr_debug("CMO not available\n");
579                 pr_debug(" <- fw_cmo_feature_init()\n");
580                 return;
581         }
582 
583         end = rtas_data_buf + CMO_MAXLENGTH - 2;
584         ptr = rtas_data_buf + 2;        /* step over strlen value */
585         key = value = ptr;
586 
587         while (*ptr && (ptr <= end)) {
588                 /* Separate the key and value by replacing '=' with '\0' and
589                  * point the value at the string after the '='
590                  */
591                 if (ptr[0] == '=') {
592                         ptr[0] = '\0';
593                         value = ptr + 1;
594                 } else if (ptr[0] == '\0' || ptr[0] == ',') {
595                         /* Terminate the string containing the key/value pair */
596                         ptr[0] = '\0';
597 
598                         if (key == value) {
599                                 pr_debug("Malformed key/value pair\n");
600                                 /* Never found a '=', end processing */
601                                 break;
602                         }
603 
604                         if (0 == strcmp(key, "CMOPageSize"))
605                                 page_order = simple_strtol(value, NULL, 10);
606                         else if (0 == strcmp(key, "PrPSP"))
607                                 CMO_PrPSP = simple_strtol(value, NULL, 10);
608                         else if (0 == strcmp(key, "SecPSP"))
609                                 CMO_SecPSP = simple_strtol(value, NULL, 10);
610                         value = key = ptr + 1;
611                 }
612                 ptr++;
613         }
614 
615         /* Page size is returned as the power of 2 of the page size,
616          * convert to the page size in bytes before returning
617          */
618         CMO_PageSize = 1 << page_order;
619         pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
620 
621         if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
622                 pr_info("CMO enabled\n");
623                 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
624                          CMO_SecPSP);
625                 powerpc_firmware_features |= FW_FEATURE_CMO;
626                 pSeries_coalesce_init();
627         } else
628                 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
629                          CMO_SecPSP);
630         spin_unlock(&rtas_data_buf_lock);
631         pr_debug(" <- fw_cmo_feature_init()\n");
632 }
633 
634 /*
635  * Early initialization.  Relocation is on but do not reference unbolted pages
636  */
637 static void __init pSeries_init_early(void)
638 {
639         pr_debug(" -> pSeries_init_early()\n");
640 
641 #ifdef CONFIG_HVC_CONSOLE
642         if (firmware_has_feature(FW_FEATURE_LPAR))
643                 hvc_vio_init_early();
644 #endif
645         if (firmware_has_feature(FW_FEATURE_XDABR))
646                 ppc_md.set_dabr = pseries_set_xdabr;
647         else if (firmware_has_feature(FW_FEATURE_DABR))
648                 ppc_md.set_dabr = pseries_set_dabr;
649 
650         if (firmware_has_feature(FW_FEATURE_SET_MODE))
651                 ppc_md.set_dawr = pseries_set_dawr;
652 
653         pSeries_cmo_feature_init();
654         iommu_init_early_pSeries();
655 
656         pr_debug(" <- pSeries_init_early()\n");
657 }
658 
659 /*
660  * Called very early, MMU is off, device-tree isn't unflattened
661  */
662 
663 static int __init pseries_probe_fw_features(unsigned long node,
664                                             const char *uname, int depth,
665                                             void *data)
666 {
667         const char *prop;
668         unsigned long len;
669         static int hypertas_found;
670         static int vec5_found;
671 
672         if (depth != 1)
673                 return 0;
674 
675         if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
676                 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
677                                            &len);
678                 if (prop) {
679                         powerpc_firmware_features |= FW_FEATURE_LPAR;
680                         fw_hypertas_feature_init(prop, len);
681                 }
682 
683                 hypertas_found = 1;
684         }
685 
686         if (!strcmp(uname, "chosen")) {
687                 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
688                                            &len);
689                 if (prop)
690                         fw_vec5_feature_init(prop, len);
691 
692                 vec5_found = 1;
693         }
694 
695         return hypertas_found && vec5_found;
696 }
697 
698 static int __init pSeries_probe(void)
699 {
700         unsigned long root = of_get_flat_dt_root();
701         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
702 
703         if (dtype == NULL)
704                 return 0;
705         if (strcmp(dtype, "chrp"))
706                 return 0;
707 
708         /* Cell blades firmware claims to be chrp while it's not. Until this
709          * is fixed, we need to avoid those here.
710          */
711         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
712             of_flat_dt_is_compatible(root, "IBM,CBEA"))
713                 return 0;
714 
715         pr_debug("pSeries detected, looking for LPAR capability...\n");
716 
717         /* Now try to figure out if we are running on LPAR */
718         of_scan_flat_dt(pseries_probe_fw_features, NULL);
719 
720 #ifdef __LITTLE_ENDIAN__
721         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
722                 long rc;
723                 /*
724                  * Tell the hypervisor that we want our exceptions to
725                  * be taken in little endian mode. If this fails we don't
726                  * want to use BUG() because it will trigger an exception.
727                  */
728                 rc = pseries_little_endian_exceptions();
729                 if (rc) {
730                         ppc_md.progress("H_SET_MODE LE exception fail", 0);
731                         panic("Could not enable little endian exceptions");
732                 }
733         }
734 #endif
735 
736         if (firmware_has_feature(FW_FEATURE_LPAR))
737                 hpte_init_lpar();
738         else
739                 hpte_init_native();
740 
741         pr_debug("Machine is%s LPAR !\n",
742                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
743 
744         return 1;
745 }
746 
747 static int pSeries_pci_probe_mode(struct pci_bus *bus)
748 {
749         if (firmware_has_feature(FW_FEATURE_LPAR))
750                 return PCI_PROBE_DEVTREE;
751         return PCI_PROBE_NORMAL;
752 }
753 
754 /**
755  * pSeries_power_off - tell firmware about how to power off the system.
756  *
757  * This function calls either the power-off rtas token in normal cases
758  * or the ibm,power-off-ups token (if present & requested) in case of
759  * a power failure. If power-off token is used, power on will only be
760  * possible with power button press. If ibm,power-off-ups token is used
761  * it will allow auto poweron after power is restored.
762  */
763 static void pSeries_power_off(void)
764 {
765         int rc;
766         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
767 
768         if (rtas_flash_term_hook)
769                 rtas_flash_term_hook(SYS_POWER_OFF);
770 
771         if (rtas_poweron_auto == 0 ||
772                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
773                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
774                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
775         } else {
776                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
777                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
778         }
779         for (;;);
780 }
781 
782 #ifndef CONFIG_PCI
783 void pSeries_final_fixup(void) { }
784 #endif
785 
786 define_machine(pseries) {
787         .name                   = "pSeries",
788         .probe                  = pSeries_probe,
789         .setup_arch             = pSeries_setup_arch,
790         .init_early             = pSeries_init_early,
791         .show_cpuinfo           = pSeries_show_cpuinfo,
792         .log_error              = pSeries_log_error,
793         .pcibios_fixup          = pSeries_final_fixup,
794         .pci_probe_mode         = pSeries_pci_probe_mode,
795         .restart                = rtas_restart,
796         .power_off              = pSeries_power_off,
797         .halt                   = rtas_halt,
798         .panic                  = rtas_os_term,
799         .get_boot_time          = rtas_get_boot_time,
800         .get_rtc_time           = rtas_get_rtc_time,
801         .set_rtc_time           = rtas_set_rtc_time,
802         .calibrate_decr         = generic_calibrate_decr,
803         .progress               = rtas_progress,
804         .system_reset_exception = pSeries_system_reset_exception,
805         .machine_check_exception = pSeries_machine_check_exception,
806 #ifdef CONFIG_KEXEC
807         .machine_kexec          = pSeries_machine_kexec,
808 #endif
809 };
810 

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