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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_each_node_by_name(np, "interrupt-controller") {
236                 typep = of_get_property(np, "compatible", NULL);
237                 if (strstr(typep, "open-pic")) {
238                         pSeries_mpic_node = of_node_get(np);
239                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
240                         setup_kexec_cpu_down_mpic();
241                         smp_init_pseries_mpic();
242                         return;
243                 } else if (strstr(typep, "ppc-xicp")) {
244                         ppc_md.init_IRQ       = pseries_xics_init_IRQ;
245                         setup_kexec_cpu_down_xics();
246                         smp_init_pseries_xics();
247                         return;
248                 }
249         }
250         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
251                " interrupt-controller\n");
252 }
253 
254 static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node)
255 {
256         struct device_node *np = node;
257         struct pci_dn *pci = NULL;
258         int err = NOTIFY_OK;
259 
260         switch (action) {
261         case OF_RECONFIG_ATTACH_NODE:
262                 pci = np->parent->data;
263                 if (pci) {
264                         update_dn_pci_info(np, pci->phb);
265 
266                         /* Create EEH device for the OF node */
267                         eeh_dev_init(np, pci->phb);
268                 }
269                 break;
270         default:
271                 err = NOTIFY_DONE;
272                 break;
273         }
274         return err;
275 }
276 
277 static struct notifier_block pci_dn_reconfig_nb = {
278         .notifier_call = pci_dn_reconfig_notifier,
279 };
280 
281 struct kmem_cache *dtl_cache;
282 
283 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
284 /*
285  * Allocate space for the dispatch trace log for all possible cpus
286  * and register the buffers with the hypervisor.  This is used for
287  * computing time stolen by the hypervisor.
288  */
289 static int alloc_dispatch_logs(void)
290 {
291         int cpu, ret;
292         struct paca_struct *pp;
293         struct dtl_entry *dtl;
294 
295         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
296                 return 0;
297 
298         if (!dtl_cache)
299                 return 0;
300 
301         for_each_possible_cpu(cpu) {
302                 pp = &paca[cpu];
303                 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
304                 if (!dtl) {
305                         pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
306                                 cpu);
307                         pr_warn("Stolen time statistics will be unreliable\n");
308                         break;
309                 }
310 
311                 pp->dtl_ridx = 0;
312                 pp->dispatch_log = dtl;
313                 pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
314                 pp->dtl_curr = dtl;
315         }
316 
317         /* Register the DTL for the current (boot) cpu */
318         dtl = get_paca()->dispatch_log;
319         get_paca()->dtl_ridx = 0;
320         get_paca()->dtl_curr = dtl;
321         get_paca()->lppaca_ptr->dtl_idx = 0;
322 
323         /* hypervisor reads buffer length from this field */
324         dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
325         ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
326         if (ret)
327                 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
328                        "with %d\n", smp_processor_id(),
329                        hard_smp_processor_id(), ret);
330         get_paca()->lppaca_ptr->dtl_enable_mask = 2;
331 
332         return 0;
333 }
334 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
335 static inline int alloc_dispatch_logs(void)
336 {
337         return 0;
338 }
339 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
340 
341 static int alloc_dispatch_log_kmem_cache(void)
342 {
343         dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
344                                                 DISPATCH_LOG_BYTES, 0, NULL);
345         if (!dtl_cache) {
346                 pr_warn("Failed to create dispatch trace log buffer cache\n");
347                 pr_warn("Stolen time statistics will be unreliable\n");
348                 return 0;
349         }
350 
351         return alloc_dispatch_logs();
352 }
353 machine_early_initcall(pseries, alloc_dispatch_log_kmem_cache);
354 
355 static void pseries_lpar_idle(void)
356 {
357         /*
358          * Default handler to go into low thread priority and possibly
359          * low power mode by cedeing processor to hypervisor
360          */
361 
362         /* Indicate to hypervisor that we are idle. */
363         get_lppaca()->idle = 1;
364 
365         /*
366          * Yield the processor to the hypervisor.  We return if
367          * an external interrupt occurs (which are driven prior
368          * to returning here) or if a prod occurs from another
369          * processor. When returning here, external interrupts
370          * are enabled.
371          */
372         cede_processor();
373 
374         get_lppaca()->idle = 0;
375 }
376 
377 /*
378  * Enable relocation on during exceptions. This has partition wide scope and
379  * may take a while to complete, if it takes longer than one second we will
380  * just give up rather than wasting any more time on this - if that turns out
381  * to ever be a problem in practice we can move this into a kernel thread to
382  * finish off the process later in boot.
383  */
384 long pSeries_enable_reloc_on_exc(void)
385 {
386         long rc;
387         unsigned int delay, total_delay = 0;
388 
389         while (1) {
390                 rc = enable_reloc_on_exceptions();
391                 if (!H_IS_LONG_BUSY(rc))
392                         return rc;
393 
394                 delay = get_longbusy_msecs(rc);
395                 total_delay += delay;
396                 if (total_delay > 1000) {
397                         pr_warn("Warning: Giving up waiting to enable "
398                                 "relocation on exceptions (%u msec)!\n",
399                                 total_delay);
400                         return rc;
401                 }
402 
403                 mdelay(delay);
404         }
405 }
406 EXPORT_SYMBOL(pSeries_enable_reloc_on_exc);
407 
408 long pSeries_disable_reloc_on_exc(void)
409 {
410         long rc;
411 
412         while (1) {
413                 rc = disable_reloc_on_exceptions();
414                 if (!H_IS_LONG_BUSY(rc))
415                         return rc;
416                 mdelay(get_longbusy_msecs(rc));
417         }
418 }
419 EXPORT_SYMBOL(pSeries_disable_reloc_on_exc);
420 
421 #ifdef CONFIG_KEXEC
422 static void pSeries_machine_kexec(struct kimage *image)
423 {
424         long rc;
425 
426         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
427                 rc = pSeries_disable_reloc_on_exc();
428                 if (rc != H_SUCCESS)
429                         pr_warning("Warning: Failed to disable relocation on "
430                                    "exceptions: %ld\n", rc);
431         }
432 
433         default_machine_kexec(image);
434 }
435 #endif
436 
437 #ifdef __LITTLE_ENDIAN__
438 long pseries_big_endian_exceptions(void)
439 {
440         long rc;
441 
442         while (1) {
443                 rc = enable_big_endian_exceptions();
444                 if (!H_IS_LONG_BUSY(rc))
445                         return rc;
446                 mdelay(get_longbusy_msecs(rc));
447         }
448 }
449 
450 static long pseries_little_endian_exceptions(void)
451 {
452         long rc;
453 
454         while (1) {
455                 rc = enable_little_endian_exceptions();
456                 if (!H_IS_LONG_BUSY(rc))
457                         return rc;
458                 mdelay(get_longbusy_msecs(rc));
459         }
460 }
461 #endif
462 
463 static void __init pSeries_setup_arch(void)
464 {
465         set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
466 
467         /* Discover PIC type and setup ppc_md accordingly */
468         pseries_discover_pic();
469 
470         /* openpic global configuration register (64-bit format). */
471         /* openpic Interrupt Source Unit pointer (64-bit format). */
472         /* python0 facility area (mmio) (64-bit format) REAL address. */
473 
474         /* init to some ~sane value until calibrate_delay() runs */
475         loops_per_jiffy = 50000000;
476 
477         fwnmi_init();
478 
479         /* By default, only probe PCI (can be overriden by rtas_pci) */
480         pci_add_flags(PCI_PROBE_ONLY);
481 
482         /* Find and initialize PCI host bridges */
483         init_pci_config_tokens();
484         find_and_init_phbs();
485         of_reconfig_notifier_register(&pci_dn_reconfig_nb);
486 
487         pSeries_nvram_init();
488 
489         if (firmware_has_feature(FW_FEATURE_LPAR)) {
490                 vpa_init(boot_cpuid);
491                 ppc_md.power_save = pseries_lpar_idle;
492                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
493         } else {
494                 /* No special idle routine */
495                 ppc_md.enable_pmcs = power4_enable_pmcs;
496         }
497 
498         ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
499 
500         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
501                 long rc;
502                 if ((rc = pSeries_enable_reloc_on_exc()) != H_SUCCESS) {
503                         pr_warn("Unable to enable relocation on exceptions: "
504                                 "%ld\n", rc);
505                 }
506         }
507 }
508 
509 static int __init pSeries_init_panel(void)
510 {
511         /* Manually leave the kernel version on the panel. */
512 #ifdef __BIG_ENDIAN__
513         ppc_md.progress("Linux ppc64\n", 0);
514 #else
515         ppc_md.progress("Linux ppc64le\n", 0);
516 #endif
517         ppc_md.progress(init_utsname()->version, 0);
518 
519         return 0;
520 }
521 machine_arch_initcall(pseries, pSeries_init_panel);
522 
523 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
524 {
525         return plpar_hcall_norets(H_SET_DABR, dabr);
526 }
527 
528 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
529 {
530         /* Have to set at least one bit in the DABRX according to PAPR */
531         if (dabrx == 0 && dabr == 0)
532                 dabrx = DABRX_USER;
533         /* PAPR says we can only set kernel and user bits */
534         dabrx &= DABRX_KERNEL | DABRX_USER;
535 
536         return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
537 }
538 
539 static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx)
540 {
541         /* PAPR says we can't set HYP */
542         dawrx &= ~DAWRX_HYP;
543 
544         return  plapr_set_watchpoint0(dawr, dawrx);
545 }
546 
547 #define CMO_CHARACTERISTICS_TOKEN 44
548 #define CMO_MAXLENGTH 1026
549 
550 void pSeries_coalesce_init(void)
551 {
552         struct hvcall_mpp_x_data mpp_x_data;
553 
554         if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
555                 powerpc_firmware_features |= FW_FEATURE_XCMO;
556         else
557                 powerpc_firmware_features &= ~FW_FEATURE_XCMO;
558 }
559 
560 /**
561  * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
562  * handle that here. (Stolen from parse_system_parameter_string)
563  */
564 static void pSeries_cmo_feature_init(void)
565 {
566         char *ptr, *key, *value, *end;
567         int call_status;
568         int page_order = IOMMU_PAGE_SHIFT_4K;
569 
570         pr_debug(" -> fw_cmo_feature_init()\n");
571         spin_lock(&rtas_data_buf_lock);
572         memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
573         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
574                                 NULL,
575                                 CMO_CHARACTERISTICS_TOKEN,
576                                 __pa(rtas_data_buf),
577                                 RTAS_DATA_BUF_SIZE);
578 
579         if (call_status != 0) {
580                 spin_unlock(&rtas_data_buf_lock);
581                 pr_debug("CMO not available\n");
582                 pr_debug(" <- fw_cmo_feature_init()\n");
583                 return;
584         }
585 
586         end = rtas_data_buf + CMO_MAXLENGTH - 2;
587         ptr = rtas_data_buf + 2;        /* step over strlen value */
588         key = value = ptr;
589 
590         while (*ptr && (ptr <= end)) {
591                 /* Separate the key and value by replacing '=' with '\0' and
592                  * point the value at the string after the '='
593                  */
594                 if (ptr[0] == '=') {
595                         ptr[0] = '\0';
596                         value = ptr + 1;
597                 } else if (ptr[0] == '\0' || ptr[0] == ',') {
598                         /* Terminate the string containing the key/value pair */
599                         ptr[0] = '\0';
600 
601                         if (key == value) {
602                                 pr_debug("Malformed key/value pair\n");
603                                 /* Never found a '=', end processing */
604                                 break;
605                         }
606 
607                         if (0 == strcmp(key, "CMOPageSize"))
608                                 page_order = simple_strtol(value, NULL, 10);
609                         else if (0 == strcmp(key, "PrPSP"))
610                                 CMO_PrPSP = simple_strtol(value, NULL, 10);
611                         else if (0 == strcmp(key, "SecPSP"))
612                                 CMO_SecPSP = simple_strtol(value, NULL, 10);
613                         value = key = ptr + 1;
614                 }
615                 ptr++;
616         }
617 
618         /* Page size is returned as the power of 2 of the page size,
619          * convert to the page size in bytes before returning
620          */
621         CMO_PageSize = 1 << page_order;
622         pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
623 
624         if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
625                 pr_info("CMO enabled\n");
626                 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
627                          CMO_SecPSP);
628                 powerpc_firmware_features |= FW_FEATURE_CMO;
629                 pSeries_coalesce_init();
630         } else
631                 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
632                          CMO_SecPSP);
633         spin_unlock(&rtas_data_buf_lock);
634         pr_debug(" <- fw_cmo_feature_init()\n");
635 }
636 
637 /*
638  * Early initialization.  Relocation is on but do not reference unbolted pages
639  */
640 static void __init pSeries_init_early(void)
641 {
642         pr_debug(" -> pSeries_init_early()\n");
643 
644 #ifdef CONFIG_HVC_CONSOLE
645         if (firmware_has_feature(FW_FEATURE_LPAR))
646                 hvc_vio_init_early();
647 #endif
648         if (firmware_has_feature(FW_FEATURE_XDABR))
649                 ppc_md.set_dabr = pseries_set_xdabr;
650         else if (firmware_has_feature(FW_FEATURE_DABR))
651                 ppc_md.set_dabr = pseries_set_dabr;
652 
653         if (firmware_has_feature(FW_FEATURE_SET_MODE))
654                 ppc_md.set_dawr = pseries_set_dawr;
655 
656         pSeries_cmo_feature_init();
657         iommu_init_early_pSeries();
658 
659         pr_debug(" <- pSeries_init_early()\n");
660 }
661 
662 /*
663  * Called very early, MMU is off, device-tree isn't unflattened
664  */
665 
666 static int __init pseries_probe_fw_features(unsigned long node,
667                                             const char *uname, int depth,
668                                             void *data)
669 {
670         const char *prop;
671         int len;
672         static int hypertas_found;
673         static int vec5_found;
674 
675         if (depth != 1)
676                 return 0;
677 
678         if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
679                 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
680                                            &len);
681                 if (prop) {
682                         powerpc_firmware_features |= FW_FEATURE_LPAR;
683                         fw_hypertas_feature_init(prop, len);
684                 }
685 
686                 hypertas_found = 1;
687         }
688 
689         if (!strcmp(uname, "chosen")) {
690                 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
691                                            &len);
692                 if (prop)
693                         fw_vec5_feature_init(prop, len);
694 
695                 vec5_found = 1;
696         }
697 
698         return hypertas_found && vec5_found;
699 }
700 
701 static int __init pSeries_probe(void)
702 {
703         unsigned long root = of_get_flat_dt_root();
704         const char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
705 
706         if (dtype == NULL)
707                 return 0;
708         if (strcmp(dtype, "chrp"))
709                 return 0;
710 
711         /* Cell blades firmware claims to be chrp while it's not. Until this
712          * is fixed, we need to avoid those here.
713          */
714         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
715             of_flat_dt_is_compatible(root, "IBM,CBEA"))
716                 return 0;
717 
718         pr_debug("pSeries detected, looking for LPAR capability...\n");
719 
720         /* Now try to figure out if we are running on LPAR */
721         of_scan_flat_dt(pseries_probe_fw_features, NULL);
722 
723 #ifdef __LITTLE_ENDIAN__
724         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
725                 long rc;
726                 /*
727                  * Tell the hypervisor that we want our exceptions to
728                  * be taken in little endian mode. If this fails we don't
729                  * want to use BUG() because it will trigger an exception.
730                  */
731                 rc = pseries_little_endian_exceptions();
732                 if (rc) {
733                         ppc_md.progress("H_SET_MODE LE exception fail", 0);
734                         panic("Could not enable little endian exceptions");
735                 }
736         }
737 #endif
738 
739         if (firmware_has_feature(FW_FEATURE_LPAR))
740                 hpte_init_lpar();
741         else
742                 hpte_init_native();
743 
744         pr_debug("Machine is%s LPAR !\n",
745                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
746 
747         return 1;
748 }
749 
750 static int pSeries_pci_probe_mode(struct pci_bus *bus)
751 {
752         if (firmware_has_feature(FW_FEATURE_LPAR))
753                 return PCI_PROBE_DEVTREE;
754         return PCI_PROBE_NORMAL;
755 }
756 
757 /**
758  * pSeries_power_off - tell firmware about how to power off the system.
759  *
760  * This function calls either the power-off rtas token in normal cases
761  * or the ibm,power-off-ups token (if present & requested) in case of
762  * a power failure. If power-off token is used, power on will only be
763  * possible with power button press. If ibm,power-off-ups token is used
764  * it will allow auto poweron after power is restored.
765  */
766 static void pSeries_power_off(void)
767 {
768         int rc;
769         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
770 
771         if (rtas_flash_term_hook)
772                 rtas_flash_term_hook(SYS_POWER_OFF);
773 
774         if (rtas_poweron_auto == 0 ||
775                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
776                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
777                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
778         } else {
779                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
780                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
781         }
782         for (;;);
783 }
784 
785 #ifndef CONFIG_PCI
786 void pSeries_final_fixup(void) { }
787 #endif
788 
789 define_machine(pseries) {
790         .name                   = "pSeries",
791         .probe                  = pSeries_probe,
792         .setup_arch             = pSeries_setup_arch,
793         .init_early             = pSeries_init_early,
794         .show_cpuinfo           = pSeries_show_cpuinfo,
795         .log_error              = pSeries_log_error,
796         .pcibios_fixup          = pSeries_final_fixup,
797         .pci_probe_mode         = pSeries_pci_probe_mode,
798         .restart                = rtas_restart,
799         .power_off              = pSeries_power_off,
800         .halt                   = rtas_halt,
801         .panic                  = rtas_os_term,
802         .get_boot_time          = rtas_get_boot_time,
803         .get_rtc_time           = rtas_get_rtc_time,
804         .set_rtc_time           = rtas_set_rtc_time,
805         .calibrate_decr         = generic_calibrate_decr,
806         .progress               = rtas_progress,
807         .system_reset_exception = pSeries_system_reset_exception,
808         .machine_check_exception = pSeries_machine_check_exception,
809 #ifdef CONFIG_KEXEC
810         .machine_kexec          = pSeries_machine_kexec,
811 #endif
812 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
813         .memory_block_size      = pseries_memory_block_size,
814 #endif
815 };
816 

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