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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/cpuidle.h>
 43 #include <linux/of.h>
 44 #include <linux/kexec.h>
 45 
 46 #include <asm/mmu.h>
 47 #include <asm/processor.h>
 48 #include <asm/io.h>
 49 #include <asm/pgtable.h>
 50 #include <asm/prom.h>
 51 #include <asm/rtas.h>
 52 #include <asm/pci-bridge.h>
 53 #include <asm/iommu.h>
 54 #include <asm/dma.h>
 55 #include <asm/machdep.h>
 56 #include <asm/irq.h>
 57 #include <asm/time.h>
 58 #include <asm/nvram.h>
 59 #include <asm/pmc.h>
 60 #include <asm/mpic.h>
 61 #include <asm/xics.h>
 62 #include <asm/ppc-pci.h>
 63 #include <asm/i8259.h>
 64 #include <asm/udbg.h>
 65 #include <asm/smp.h>
 66 #include <asm/firmware.h>
 67 #include <asm/eeh.h>
 68 #include <asm/reg.h>
 69 
 70 #include "plpar_wrappers.h"
 71 #include "pseries.h"
 72 
 73 int CMO_PrPSP = -1;
 74 int CMO_SecPSP = -1;
 75 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT);
 76 EXPORT_SYMBOL(CMO_PageSize);
 77 
 78 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
 79 
 80 static struct device_node *pSeries_mpic_node;
 81 
 82 static void pSeries_show_cpuinfo(struct seq_file *m)
 83 {
 84         struct device_node *root;
 85         const char *model = "";
 86 
 87         root = of_find_node_by_path("/");
 88         if (root)
 89                 model = of_get_property(root, "model", NULL);
 90         seq_printf(m, "machine\t\t: CHRP %s\n", model);
 91         of_node_put(root);
 92 }
 93 
 94 /* Initialize firmware assisted non-maskable interrupts if
 95  * the firmware supports this feature.
 96  */
 97 static void __init fwnmi_init(void)
 98 {
 99         unsigned long system_reset_addr, machine_check_addr;
100 
101         int ibm_nmi_register = rtas_token("ibm,nmi-register");
102         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
103                 return;
104 
105         /* If the kernel's not linked at zero we point the firmware at low
106          * addresses anyway, and use a trampoline to get to the real code. */
107         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
108         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
109 
110         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
111                                 machine_check_addr))
112                 fwnmi_active = 1;
113 }
114 
115 static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
116 {
117         struct irq_chip *chip = irq_desc_get_chip(desc);
118         unsigned int cascade_irq = i8259_irq();
119 
120         if (cascade_irq != NO_IRQ)
121                 generic_handle_irq(cascade_irq);
122 
123         chip->irq_eoi(&desc->irq_data);
124 }
125 
126 static void __init pseries_setup_i8259_cascade(void)
127 {
128         struct device_node *np, *old, *found = NULL;
129         unsigned int cascade;
130         const u32 *addrp;
131         unsigned long intack = 0;
132         int naddr;
133 
134         for_each_node_by_type(np, "interrupt-controller") {
135                 if (of_device_is_compatible(np, "chrp,iic")) {
136                         found = np;
137                         break;
138                 }
139         }
140 
141         if (found == NULL) {
142                 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
143                 return;
144         }
145 
146         cascade = irq_of_parse_and_map(found, 0);
147         if (cascade == NO_IRQ) {
148                 printk(KERN_ERR "pic: failed to map cascade interrupt");
149                 return;
150         }
151         pr_debug("pic: cascade mapped to irq %d\n", cascade);
152 
153         for (old = of_node_get(found); old != NULL ; old = np) {
154                 np = of_get_parent(old);
155                 of_node_put(old);
156                 if (np == NULL)
157                         break;
158                 if (strcmp(np->name, "pci") != 0)
159                         continue;
160                 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
161                 if (addrp == NULL)
162                         continue;
163                 naddr = of_n_addr_cells(np);
164                 intack = addrp[naddr-1];
165                 if (naddr > 1)
166                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
167         }
168         if (intack)
169                 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
170         i8259_init(found, intack);
171         of_node_put(found);
172         irq_set_chained_handler(cascade, pseries_8259_cascade);
173 }
174 
175 static void __init pseries_mpic_init_IRQ(void)
176 {
177         struct device_node *np;
178         const unsigned int *opprop;
179         unsigned long openpic_addr = 0;
180         int naddr, n, i, opplen;
181         struct mpic *mpic;
182 
183         np = of_find_node_by_path("/");
184         naddr = of_n_addr_cells(np);
185         opprop = of_get_property(np, "platform-open-pic", &opplen);
186         if (opprop != 0) {
187                 openpic_addr = of_read_number(opprop, naddr);
188                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
189         }
190         of_node_put(np);
191 
192         BUG_ON(openpic_addr == 0);
193 
194         /* Setup the openpic driver */
195         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
196                         MPIC_NO_RESET, 16, 0, " MPIC     ");
197         BUG_ON(mpic == NULL);
198 
199         /* Add ISUs */
200         opplen /= sizeof(u32);
201         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
202                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
203                 mpic_assign_isu(mpic, n, isuaddr);
204         }
205 
206         /* Setup top-level get_irq */
207         ppc_md.get_irq = mpic_get_irq;
208 
209         /* All ISUs are setup, complete initialization */
210         mpic_init(mpic);
211 
212         /* Look for cascade */
213         pseries_setup_i8259_cascade();
214 }
215 
216 static void __init pseries_xics_init_IRQ(void)
217 {
218         xics_init();
219         pseries_setup_i8259_cascade();
220 }
221 
222 static void pseries_lpar_enable_pmcs(void)
223 {
224         unsigned long set, reset;
225 
226         set = 1UL << 63;
227         reset = 0;
228         plpar_hcall_norets(H_PERFMON, set, reset);
229 }
230 
231 static void __init pseries_discover_pic(void)
232 {
233         struct device_node *np;
234         const char *typep;
235 
236         for (np = NULL; (np = of_find_node_by_name(np,
237                                                    "interrupt-controller"));) {
238                 typep = of_get_property(np, "compatible", NULL);
239                 if (strstr(typep, "open-pic")) {
240                         pSeries_mpic_node = of_node_get(np);
241                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
242                         setup_kexec_cpu_down_mpic();
243                         smp_init_pseries_mpic();
244                         return;
245                 } else if (strstr(typep, "ppc-xicp")) {
246                         ppc_md.init_IRQ       = pseries_xics_init_IRQ;
247                         setup_kexec_cpu_down_xics();
248                         smp_init_pseries_xics();
249                         return;
250                 }
251         }
252         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
253                " interrupt-controller\n");
254 }
255 
256 static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node)
257 {
258         struct device_node *np = node;
259         struct pci_dn *pci = NULL;
260         int err = NOTIFY_OK;
261 
262         switch (action) {
263         case OF_RECONFIG_ATTACH_NODE:
264                 pci = np->parent->data;
265                 if (pci) {
266                         update_dn_pci_info(np, pci->phb);
267 
268                         /* Create EEH device for the OF node */
269                         eeh_dev_init(np, pci->phb);
270                 }
271                 break;
272         default:
273                 err = NOTIFY_DONE;
274                 break;
275         }
276         return err;
277 }
278 
279 static struct notifier_block pci_dn_reconfig_nb = {
280         .notifier_call = pci_dn_reconfig_notifier,
281 };
282 
283 struct kmem_cache *dtl_cache;
284 
285 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
286 /*
287  * Allocate space for the dispatch trace log for all possible cpus
288  * and register the buffers with the hypervisor.  This is used for
289  * computing time stolen by the hypervisor.
290  */
291 static int alloc_dispatch_logs(void)
292 {
293         int cpu, ret;
294         struct paca_struct *pp;
295         struct dtl_entry *dtl;
296 
297         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
298                 return 0;
299 
300         if (!dtl_cache)
301                 return 0;
302 
303         for_each_possible_cpu(cpu) {
304                 pp = &paca[cpu];
305                 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
306                 if (!dtl) {
307                         pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
308                                 cpu);
309                         pr_warn("Stolen time statistics will be unreliable\n");
310                         break;
311                 }
312 
313                 pp->dtl_ridx = 0;
314                 pp->dispatch_log = dtl;
315                 pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
316                 pp->dtl_curr = dtl;
317         }
318 
319         /* Register the DTL for the current (boot) cpu */
320         dtl = get_paca()->dispatch_log;
321         get_paca()->dtl_ridx = 0;
322         get_paca()->dtl_curr = dtl;
323         get_paca()->lppaca_ptr->dtl_idx = 0;
324 
325         /* hypervisor reads buffer length from this field */
326         dtl->enqueue_to_dispatch_time = DISPATCH_LOG_BYTES;
327         ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
328         if (ret)
329                 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
330                        "with %d\n", smp_processor_id(),
331                        hard_smp_processor_id(), ret);
332         get_paca()->lppaca_ptr->dtl_enable_mask = 2;
333 
334         return 0;
335 }
336 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
337 static inline int alloc_dispatch_logs(void)
338 {
339         return 0;
340 }
341 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
342 
343 static int alloc_dispatch_log_kmem_cache(void)
344 {
345         dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
346                                                 DISPATCH_LOG_BYTES, 0, NULL);
347         if (!dtl_cache) {
348                 pr_warn("Failed to create dispatch trace log buffer cache\n");
349                 pr_warn("Stolen time statistics will be unreliable\n");
350                 return 0;
351         }
352 
353         return alloc_dispatch_logs();
354 }
355 early_initcall(alloc_dispatch_log_kmem_cache);
356 
357 static void pseries_lpar_idle(void)
358 {
359         /* This would call on the cpuidle framework, and the back-end pseries
360          * driver to  go to idle states
361          */
362         if (cpuidle_idle_call()) {
363                 /* On error, execute default handler
364                  * to go into low thread priority and possibly
365                  * low power mode by cedeing processor to hypervisor
366                  */
367 
368                 /* Indicate to hypervisor that we are idle. */
369                 get_lppaca()->idle = 1;
370 
371                 /*
372                  * Yield the processor to the hypervisor.  We return if
373                  * an external interrupt occurs (which are driven prior
374                  * to returning here) or if a prod occurs from another
375                  * processor. When returning here, external interrupts
376                  * are enabled.
377                  */
378                 cede_processor();
379 
380                 get_lppaca()->idle = 0;
381         }
382 }
383 
384 /*
385  * Enable relocation on during exceptions. This has partition wide scope and
386  * may take a while to complete, if it takes longer than one second we will
387  * just give up rather than wasting any more time on this - if that turns out
388  * to ever be a problem in practice we can move this into a kernel thread to
389  * finish off the process later in boot.
390  */
391 long pSeries_enable_reloc_on_exc(void)
392 {
393         long rc;
394         unsigned int delay, total_delay = 0;
395 
396         while (1) {
397                 rc = enable_reloc_on_exceptions();
398                 if (!H_IS_LONG_BUSY(rc))
399                         return rc;
400 
401                 delay = get_longbusy_msecs(rc);
402                 total_delay += delay;
403                 if (total_delay > 1000) {
404                         pr_warn("Warning: Giving up waiting to enable "
405                                 "relocation on exceptions (%u msec)!\n",
406                                 total_delay);
407                         return rc;
408                 }
409 
410                 mdelay(delay);
411         }
412 }
413 EXPORT_SYMBOL(pSeries_enable_reloc_on_exc);
414 
415 long pSeries_disable_reloc_on_exc(void)
416 {
417         long rc;
418 
419         while (1) {
420                 rc = disable_reloc_on_exceptions();
421                 if (!H_IS_LONG_BUSY(rc))
422                         return rc;
423                 mdelay(get_longbusy_msecs(rc));
424         }
425 }
426 EXPORT_SYMBOL(pSeries_disable_reloc_on_exc);
427 
428 #ifdef CONFIG_KEXEC
429 static void pSeries_machine_kexec(struct kimage *image)
430 {
431         long rc;
432 
433         if (firmware_has_feature(FW_FEATURE_SET_MODE) &&
434             (image->type != KEXEC_TYPE_CRASH)) {
435                 rc = pSeries_disable_reloc_on_exc();
436                 if (rc != H_SUCCESS)
437                         pr_warning("Warning: Failed to disable relocation on "
438                                    "exceptions: %ld\n", rc);
439         }
440 
441         default_machine_kexec(image);
442 }
443 #endif
444 
445 static void __init pSeries_setup_arch(void)
446 {
447         panic_timeout = 10;
448 
449         /* Discover PIC type and setup ppc_md accordingly */
450         pseries_discover_pic();
451 
452         /* openpic global configuration register (64-bit format). */
453         /* openpic Interrupt Source Unit pointer (64-bit format). */
454         /* python0 facility area (mmio) (64-bit format) REAL address. */
455 
456         /* init to some ~sane value until calibrate_delay() runs */
457         loops_per_jiffy = 50000000;
458 
459         fwnmi_init();
460 
461         /* By default, only probe PCI (can be overriden by rtas_pci) */
462         pci_add_flags(PCI_PROBE_ONLY);
463 
464         /* Find and initialize PCI host bridges */
465         init_pci_config_tokens();
466         find_and_init_phbs();
467         of_reconfig_notifier_register(&pci_dn_reconfig_nb);
468 
469         pSeries_nvram_init();
470 
471         if (firmware_has_feature(FW_FEATURE_LPAR)) {
472                 vpa_init(boot_cpuid);
473                 ppc_md.power_save = pseries_lpar_idle;
474                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
475         } else {
476                 /* No special idle routine */
477                 ppc_md.enable_pmcs = power4_enable_pmcs;
478         }
479 
480         ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
481 
482         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
483                 long rc;
484                 if ((rc = pSeries_enable_reloc_on_exc()) != H_SUCCESS) {
485                         pr_warn("Unable to enable relocation on exceptions: "
486                                 "%ld\n", rc);
487                 }
488         }
489 }
490 
491 static int __init pSeries_init_panel(void)
492 {
493         /* Manually leave the kernel version on the panel. */
494         ppc_md.progress("Linux ppc64\n", 0);
495         ppc_md.progress(init_utsname()->version, 0);
496 
497         return 0;
498 }
499 machine_arch_initcall(pseries, pSeries_init_panel);
500 
501 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
502 {
503         return plpar_hcall_norets(H_SET_DABR, dabr);
504 }
505 
506 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
507 {
508         /* Have to set at least one bit in the DABRX according to PAPR */
509         if (dabrx == 0 && dabr == 0)
510                 dabrx = DABRX_USER;
511         /* PAPR says we can only set kernel and user bits */
512         dabrx &= DABRX_KERNEL | DABRX_USER;
513 
514         return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
515 }
516 
517 static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx)
518 {
519         /* PAPR says we can't set HYP */
520         dawrx &= ~DAWRX_HYP;
521 
522         return  plapr_set_watchpoint0(dawr, dawrx);
523 }
524 
525 #define CMO_CHARACTERISTICS_TOKEN 44
526 #define CMO_MAXLENGTH 1026
527 
528 void pSeries_coalesce_init(void)
529 {
530         struct hvcall_mpp_x_data mpp_x_data;
531 
532         if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
533                 powerpc_firmware_features |= FW_FEATURE_XCMO;
534         else
535                 powerpc_firmware_features &= ~FW_FEATURE_XCMO;
536 }
537 
538 /**
539  * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
540  * handle that here. (Stolen from parse_system_parameter_string)
541  */
542 void pSeries_cmo_feature_init(void)
543 {
544         char *ptr, *key, *value, *end;
545         int call_status;
546         int page_order = IOMMU_PAGE_SHIFT;
547 
548         pr_debug(" -> fw_cmo_feature_init()\n");
549         spin_lock(&rtas_data_buf_lock);
550         memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
551         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
552                                 NULL,
553                                 CMO_CHARACTERISTICS_TOKEN,
554                                 __pa(rtas_data_buf),
555                                 RTAS_DATA_BUF_SIZE);
556 
557         if (call_status != 0) {
558                 spin_unlock(&rtas_data_buf_lock);
559                 pr_debug("CMO not available\n");
560                 pr_debug(" <- fw_cmo_feature_init()\n");
561                 return;
562         }
563 
564         end = rtas_data_buf + CMO_MAXLENGTH - 2;
565         ptr = rtas_data_buf + 2;        /* step over strlen value */
566         key = value = ptr;
567 
568         while (*ptr && (ptr <= end)) {
569                 /* Separate the key and value by replacing '=' with '\0' and
570                  * point the value at the string after the '='
571                  */
572                 if (ptr[0] == '=') {
573                         ptr[0] = '\0';
574                         value = ptr + 1;
575                 } else if (ptr[0] == '\0' || ptr[0] == ',') {
576                         /* Terminate the string containing the key/value pair */
577                         ptr[0] = '\0';
578 
579                         if (key == value) {
580                                 pr_debug("Malformed key/value pair\n");
581                                 /* Never found a '=', end processing */
582                                 break;
583                         }
584 
585                         if (0 == strcmp(key, "CMOPageSize"))
586                                 page_order = simple_strtol(value, NULL, 10);
587                         else if (0 == strcmp(key, "PrPSP"))
588                                 CMO_PrPSP = simple_strtol(value, NULL, 10);
589                         else if (0 == strcmp(key, "SecPSP"))
590                                 CMO_SecPSP = simple_strtol(value, NULL, 10);
591                         value = key = ptr + 1;
592                 }
593                 ptr++;
594         }
595 
596         /* Page size is returned as the power of 2 of the page size,
597          * convert to the page size in bytes before returning
598          */
599         CMO_PageSize = 1 << page_order;
600         pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
601 
602         if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
603                 pr_info("CMO enabled\n");
604                 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
605                          CMO_SecPSP);
606                 powerpc_firmware_features |= FW_FEATURE_CMO;
607                 pSeries_coalesce_init();
608         } else
609                 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
610                          CMO_SecPSP);
611         spin_unlock(&rtas_data_buf_lock);
612         pr_debug(" <- fw_cmo_feature_init()\n");
613 }
614 
615 /*
616  * Early initialization.  Relocation is on but do not reference unbolted pages
617  */
618 static void __init pSeries_init_early(void)
619 {
620         pr_debug(" -> pSeries_init_early()\n");
621 
622 #ifdef CONFIG_HVC_CONSOLE
623         if (firmware_has_feature(FW_FEATURE_LPAR))
624                 hvc_vio_init_early();
625 #endif
626         if (firmware_has_feature(FW_FEATURE_XDABR))
627                 ppc_md.set_dabr = pseries_set_xdabr;
628         else if (firmware_has_feature(FW_FEATURE_DABR))
629                 ppc_md.set_dabr = pseries_set_dabr;
630 
631         if (firmware_has_feature(FW_FEATURE_SET_MODE))
632                 ppc_md.set_dawr = pseries_set_dawr;
633 
634         pSeries_cmo_feature_init();
635         iommu_init_early_pSeries();
636 
637         pr_debug(" <- pSeries_init_early()\n");
638 }
639 
640 /*
641  * Called very early, MMU is off, device-tree isn't unflattened
642  */
643 
644 static int __init pseries_probe_fw_features(unsigned long node,
645                                             const char *uname, int depth,
646                                             void *data)
647 {
648         const char *prop;
649         unsigned long len;
650         static int hypertas_found;
651         static int vec5_found;
652 
653         if (depth != 1)
654                 return 0;
655 
656         if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
657                 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
658                                            &len);
659                 if (prop) {
660                         powerpc_firmware_features |= FW_FEATURE_LPAR;
661                         fw_hypertas_feature_init(prop, len);
662                 }
663 
664                 hypertas_found = 1;
665         }
666 
667         if (!strcmp(uname, "chosen")) {
668                 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
669                                            &len);
670                 if (prop)
671                         fw_vec5_feature_init(prop, len);
672 
673                 vec5_found = 1;
674         }
675 
676         return hypertas_found && vec5_found;
677 }
678 
679 static int __init pSeries_probe(void)
680 {
681         unsigned long root = of_get_flat_dt_root();
682         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
683 
684         if (dtype == NULL)
685                 return 0;
686         if (strcmp(dtype, "chrp"))
687                 return 0;
688 
689         /* Cell blades firmware claims to be chrp while it's not. Until this
690          * is fixed, we need to avoid those here.
691          */
692         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
693             of_flat_dt_is_compatible(root, "IBM,CBEA"))
694                 return 0;
695 
696         pr_debug("pSeries detected, looking for LPAR capability...\n");
697 
698         /* Now try to figure out if we are running on LPAR */
699         of_scan_flat_dt(pseries_probe_fw_features, NULL);
700 
701         if (firmware_has_feature(FW_FEATURE_LPAR))
702                 hpte_init_lpar();
703         else
704                 hpte_init_native();
705 
706         pr_debug("Machine is%s LPAR !\n",
707                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
708 
709         return 1;
710 }
711 
712 static int pSeries_pci_probe_mode(struct pci_bus *bus)
713 {
714         if (firmware_has_feature(FW_FEATURE_LPAR))
715                 return PCI_PROBE_DEVTREE;
716         return PCI_PROBE_NORMAL;
717 }
718 
719 /**
720  * pSeries_power_off - tell firmware about how to power off the system.
721  *
722  * This function calls either the power-off rtas token in normal cases
723  * or the ibm,power-off-ups token (if present & requested) in case of
724  * a power failure. If power-off token is used, power on will only be
725  * possible with power button press. If ibm,power-off-ups token is used
726  * it will allow auto poweron after power is restored.
727  */
728 static void pSeries_power_off(void)
729 {
730         int rc;
731         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
732 
733         if (rtas_flash_term_hook)
734                 rtas_flash_term_hook(SYS_POWER_OFF);
735 
736         if (rtas_poweron_auto == 0 ||
737                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
738                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
739                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
740         } else {
741                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
742                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
743         }
744         for (;;);
745 }
746 
747 #ifndef CONFIG_PCI
748 void pSeries_final_fixup(void) { }
749 #endif
750 
751 define_machine(pseries) {
752         .name                   = "pSeries",
753         .probe                  = pSeries_probe,
754         .setup_arch             = pSeries_setup_arch,
755         .init_early             = pSeries_init_early,
756         .show_cpuinfo           = pSeries_show_cpuinfo,
757         .log_error              = pSeries_log_error,
758         .pcibios_fixup          = pSeries_final_fixup,
759         .pci_probe_mode         = pSeries_pci_probe_mode,
760         .restart                = rtas_restart,
761         .power_off              = pSeries_power_off,
762         .halt                   = rtas_halt,
763         .panic                  = rtas_os_term,
764         .get_boot_time          = rtas_get_boot_time,
765         .get_rtc_time           = rtas_get_rtc_time,
766         .set_rtc_time           = rtas_set_rtc_time,
767         .calibrate_decr         = generic_calibrate_decr,
768         .progress               = rtas_progress,
769         .system_reset_exception = pSeries_system_reset_exception,
770         .machine_check_exception = pSeries_machine_check_exception,
771 #ifdef CONFIG_KEXEC
772         .machine_kexec          = pSeries_machine_kexec,
773 #endif
774 };
775 

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