Merge remote-tracking branch 'pci/next'
[karo-tx-linux.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 #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 #include <asm/plpar_wrappers.h>
70
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_4K);
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(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 != NULL) {
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_each_node_by_name(np, "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 *data)
256 {
257         struct of_reconfig_data *rd = data;
258         struct device_node *parent, *np = rd->dn;
259         struct pci_dn *pdn;
260         int err = NOTIFY_OK;
261
262         switch (action) {
263         case OF_RECONFIG_ATTACH_NODE:
264                 parent = of_get_parent(np);
265                 pdn = parent ? PCI_DN(parent) : NULL;
266                 if (pdn) {
267                         /* Create pdn and EEH device */
268                         update_dn_pci_info(np, pdn->phb);
269                         eeh_dev_init(PCI_DN(np), pdn->phb);
270                 }
271
272                 of_node_put(parent);
273                 break;
274         case OF_RECONFIG_DETACH_NODE:
275                 pdn = PCI_DN(np);
276                 if (pdn)
277                         list_del(&pdn->list);
278                 break;
279         default:
280                 err = NOTIFY_DONE;
281                 break;
282         }
283         return err;
284 }
285
286 static struct notifier_block pci_dn_reconfig_nb = {
287         .notifier_call = pci_dn_reconfig_notifier,
288 };
289
290 struct kmem_cache *dtl_cache;
291
292 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
293 /*
294  * Allocate space for the dispatch trace log for all possible cpus
295  * and register the buffers with the hypervisor.  This is used for
296  * computing time stolen by the hypervisor.
297  */
298 static int alloc_dispatch_logs(void)
299 {
300         int cpu, ret;
301         struct paca_struct *pp;
302         struct dtl_entry *dtl;
303
304         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
305                 return 0;
306
307         if (!dtl_cache)
308                 return 0;
309
310         for_each_possible_cpu(cpu) {
311                 pp = &paca[cpu];
312                 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
313                 if (!dtl) {
314                         pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
315                                 cpu);
316                         pr_warn("Stolen time statistics will be unreliable\n");
317                         break;
318                 }
319
320                 pp->dtl_ridx = 0;
321                 pp->dispatch_log = dtl;
322                 pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
323                 pp->dtl_curr = dtl;
324         }
325
326         /* Register the DTL for the current (boot) cpu */
327         dtl = get_paca()->dispatch_log;
328         get_paca()->dtl_ridx = 0;
329         get_paca()->dtl_curr = dtl;
330         get_paca()->lppaca_ptr->dtl_idx = 0;
331
332         /* hypervisor reads buffer length from this field */
333         dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
334         ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
335         if (ret)
336                 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
337                        "with %d\n", smp_processor_id(),
338                        hard_smp_processor_id(), ret);
339         get_paca()->lppaca_ptr->dtl_enable_mask = 2;
340
341         return 0;
342 }
343 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
344 static inline int alloc_dispatch_logs(void)
345 {
346         return 0;
347 }
348 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
349
350 static int alloc_dispatch_log_kmem_cache(void)
351 {
352         dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
353                                                 DISPATCH_LOG_BYTES, 0, NULL);
354         if (!dtl_cache) {
355                 pr_warn("Failed to create dispatch trace log buffer cache\n");
356                 pr_warn("Stolen time statistics will be unreliable\n");
357                 return 0;
358         }
359
360         return alloc_dispatch_logs();
361 }
362 machine_early_initcall(pseries, alloc_dispatch_log_kmem_cache);
363
364 static void pseries_lpar_idle(void)
365 {
366         /*
367          * Default handler to go into low thread priority and possibly
368          * low power mode by cedeing processor to hypervisor
369          */
370
371         /* Indicate to hypervisor that we are idle. */
372         get_lppaca()->idle = 1;
373
374         /*
375          * Yield the processor to the hypervisor.  We return if
376          * an external interrupt occurs (which are driven prior
377          * to returning here) or if a prod occurs from another
378          * processor. When returning here, external interrupts
379          * are enabled.
380          */
381         cede_processor();
382
383         get_lppaca()->idle = 0;
384 }
385
386 /*
387  * Enable relocation on during exceptions. This has partition wide scope and
388  * may take a while to complete, if it takes longer than one second we will
389  * just give up rather than wasting any more time on this - if that turns out
390  * to ever be a problem in practice we can move this into a kernel thread to
391  * finish off the process later in boot.
392  */
393 long pSeries_enable_reloc_on_exc(void)
394 {
395         long rc;
396         unsigned int delay, total_delay = 0;
397
398         while (1) {
399                 rc = enable_reloc_on_exceptions();
400                 if (!H_IS_LONG_BUSY(rc))
401                         return rc;
402
403                 delay = get_longbusy_msecs(rc);
404                 total_delay += delay;
405                 if (total_delay > 1000) {
406                         pr_warn("Warning: Giving up waiting to enable "
407                                 "relocation on exceptions (%u msec)!\n",
408                                 total_delay);
409                         return rc;
410                 }
411
412                 mdelay(delay);
413         }
414 }
415 EXPORT_SYMBOL(pSeries_enable_reloc_on_exc);
416
417 long pSeries_disable_reloc_on_exc(void)
418 {
419         long rc;
420
421         while (1) {
422                 rc = disable_reloc_on_exceptions();
423                 if (!H_IS_LONG_BUSY(rc))
424                         return rc;
425                 mdelay(get_longbusy_msecs(rc));
426         }
427 }
428 EXPORT_SYMBOL(pSeries_disable_reloc_on_exc);
429
430 #ifdef CONFIG_KEXEC
431 static void pSeries_machine_kexec(struct kimage *image)
432 {
433         long rc;
434
435         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
436                 rc = pSeries_disable_reloc_on_exc();
437                 if (rc != H_SUCCESS)
438                         pr_warning("Warning: Failed to disable relocation on "
439                                    "exceptions: %ld\n", rc);
440         }
441
442         default_machine_kexec(image);
443 }
444 #endif
445
446 #ifdef __LITTLE_ENDIAN__
447 long pseries_big_endian_exceptions(void)
448 {
449         long rc;
450
451         while (1) {
452                 rc = enable_big_endian_exceptions();
453                 if (!H_IS_LONG_BUSY(rc))
454                         return rc;
455                 mdelay(get_longbusy_msecs(rc));
456         }
457 }
458
459 static long pseries_little_endian_exceptions(void)
460 {
461         long rc;
462
463         while (1) {
464                 rc = enable_little_endian_exceptions();
465                 if (!H_IS_LONG_BUSY(rc))
466                         return rc;
467                 mdelay(get_longbusy_msecs(rc));
468         }
469 }
470 #endif
471
472 static void __init find_and_init_phbs(void)
473 {
474         struct device_node *node;
475         struct pci_controller *phb;
476         struct device_node *root = of_find_node_by_path("/");
477
478         for_each_child_of_node(root, node) {
479                 if (node->type == NULL || (strcmp(node->type, "pci") != 0 &&
480                                            strcmp(node->type, "pciex") != 0))
481                         continue;
482
483                 phb = pcibios_alloc_controller(node);
484                 if (!phb)
485                         continue;
486                 rtas_setup_phb(phb);
487                 pci_process_bridge_OF_ranges(phb, node, 0);
488                 isa_bridge_find_early(phb);
489                 phb->controller_ops = pseries_pci_controller_ops;
490         }
491
492         of_node_put(root);
493         pci_devs_phb_init();
494
495         /*
496          * PCI_PROBE_ONLY and PCI_REASSIGN_ALL_BUS can be set via properties
497          * in chosen.
498          */
499         of_pci_check_probe_only();
500 }
501
502 static void __init pSeries_setup_arch(void)
503 {
504         set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
505
506         /* Discover PIC type and setup ppc_md accordingly */
507         pseries_discover_pic();
508
509         /* openpic global configuration register (64-bit format). */
510         /* openpic Interrupt Source Unit pointer (64-bit format). */
511         /* python0 facility area (mmio) (64-bit format) REAL address. */
512
513         /* init to some ~sane value until calibrate_delay() runs */
514         loops_per_jiffy = 50000000;
515
516         fwnmi_init();
517
518         /* By default, only probe PCI (can be overriden by rtas_pci) */
519         pci_add_flags(PCI_PROBE_ONLY);
520
521         /* Find and initialize PCI host bridges */
522         init_pci_config_tokens();
523         find_and_init_phbs();
524         of_reconfig_notifier_register(&pci_dn_reconfig_nb);
525
526         pSeries_nvram_init();
527
528         if (firmware_has_feature(FW_FEATURE_LPAR)) {
529                 vpa_init(boot_cpuid);
530                 ppc_md.power_save = pseries_lpar_idle;
531                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
532         } else {
533                 /* No special idle routine */
534                 ppc_md.enable_pmcs = power4_enable_pmcs;
535         }
536
537         ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
538
539         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
540                 long rc;
541
542                 rc = pSeries_enable_reloc_on_exc();
543                 if (rc == H_P2) {
544                         pr_info("Relocation on exceptions not supported\n");
545                 } else if (rc != H_SUCCESS) {
546                         pr_warn("Unable to enable relocation on exceptions: "
547                                 "%ld\n", rc);
548                 }
549         }
550 }
551
552 static int __init pSeries_init_panel(void)
553 {
554         /* Manually leave the kernel version on the panel. */
555 #ifdef __BIG_ENDIAN__
556         ppc_md.progress("Linux ppc64\n", 0);
557 #else
558         ppc_md.progress("Linux ppc64le\n", 0);
559 #endif
560         ppc_md.progress(init_utsname()->version, 0);
561
562         return 0;
563 }
564 machine_arch_initcall(pseries, pSeries_init_panel);
565
566 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
567 {
568         return plpar_hcall_norets(H_SET_DABR, dabr);
569 }
570
571 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
572 {
573         /* Have to set at least one bit in the DABRX according to PAPR */
574         if (dabrx == 0 && dabr == 0)
575                 dabrx = DABRX_USER;
576         /* PAPR says we can only set kernel and user bits */
577         dabrx &= DABRX_KERNEL | DABRX_USER;
578
579         return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
580 }
581
582 static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx)
583 {
584         /* PAPR says we can't set HYP */
585         dawrx &= ~DAWRX_HYP;
586
587         return  plapr_set_watchpoint0(dawr, dawrx);
588 }
589
590 #define CMO_CHARACTERISTICS_TOKEN 44
591 #define CMO_MAXLENGTH 1026
592
593 void pSeries_coalesce_init(void)
594 {
595         struct hvcall_mpp_x_data mpp_x_data;
596
597         if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
598                 powerpc_firmware_features |= FW_FEATURE_XCMO;
599         else
600                 powerpc_firmware_features &= ~FW_FEATURE_XCMO;
601 }
602
603 /**
604  * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
605  * handle that here. (Stolen from parse_system_parameter_string)
606  */
607 static void pSeries_cmo_feature_init(void)
608 {
609         char *ptr, *key, *value, *end;
610         int call_status;
611         int page_order = IOMMU_PAGE_SHIFT_4K;
612
613         pr_debug(" -> fw_cmo_feature_init()\n");
614         spin_lock(&rtas_data_buf_lock);
615         memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
616         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
617                                 NULL,
618                                 CMO_CHARACTERISTICS_TOKEN,
619                                 __pa(rtas_data_buf),
620                                 RTAS_DATA_BUF_SIZE);
621
622         if (call_status != 0) {
623                 spin_unlock(&rtas_data_buf_lock);
624                 pr_debug("CMO not available\n");
625                 pr_debug(" <- fw_cmo_feature_init()\n");
626                 return;
627         }
628
629         end = rtas_data_buf + CMO_MAXLENGTH - 2;
630         ptr = rtas_data_buf + 2;        /* step over strlen value */
631         key = value = ptr;
632
633         while (*ptr && (ptr <= end)) {
634                 /* Separate the key and value by replacing '=' with '\0' and
635                  * point the value at the string after the '='
636                  */
637                 if (ptr[0] == '=') {
638                         ptr[0] = '\0';
639                         value = ptr + 1;
640                 } else if (ptr[0] == '\0' || ptr[0] == ',') {
641                         /* Terminate the string containing the key/value pair */
642                         ptr[0] = '\0';
643
644                         if (key == value) {
645                                 pr_debug("Malformed key/value pair\n");
646                                 /* Never found a '=', end processing */
647                                 break;
648                         }
649
650                         if (0 == strcmp(key, "CMOPageSize"))
651                                 page_order = simple_strtol(value, NULL, 10);
652                         else if (0 == strcmp(key, "PrPSP"))
653                                 CMO_PrPSP = simple_strtol(value, NULL, 10);
654                         else if (0 == strcmp(key, "SecPSP"))
655                                 CMO_SecPSP = simple_strtol(value, NULL, 10);
656                         value = key = ptr + 1;
657                 }
658                 ptr++;
659         }
660
661         /* Page size is returned as the power of 2 of the page size,
662          * convert to the page size in bytes before returning
663          */
664         CMO_PageSize = 1 << page_order;
665         pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
666
667         if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
668                 pr_info("CMO enabled\n");
669                 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
670                          CMO_SecPSP);
671                 powerpc_firmware_features |= FW_FEATURE_CMO;
672                 pSeries_coalesce_init();
673         } else
674                 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
675                          CMO_SecPSP);
676         spin_unlock(&rtas_data_buf_lock);
677         pr_debug(" <- fw_cmo_feature_init()\n");
678 }
679
680 /*
681  * Early initialization.  Relocation is on but do not reference unbolted pages
682  */
683 static void __init pSeries_init_early(void)
684 {
685         pr_debug(" -> pSeries_init_early()\n");
686
687 #ifdef CONFIG_HVC_CONSOLE
688         if (firmware_has_feature(FW_FEATURE_LPAR))
689                 hvc_vio_init_early();
690 #endif
691         if (firmware_has_feature(FW_FEATURE_XDABR))
692                 ppc_md.set_dabr = pseries_set_xdabr;
693         else if (firmware_has_feature(FW_FEATURE_DABR))
694                 ppc_md.set_dabr = pseries_set_dabr;
695
696         if (firmware_has_feature(FW_FEATURE_SET_MODE))
697                 ppc_md.set_dawr = pseries_set_dawr;
698
699         pSeries_cmo_feature_init();
700         iommu_init_early_pSeries();
701
702         pr_debug(" <- pSeries_init_early()\n");
703 }
704
705 /**
706  * pseries_power_off - tell firmware about how to power off the system.
707  *
708  * This function calls either the power-off rtas token in normal cases
709  * or the ibm,power-off-ups token (if present & requested) in case of
710  * a power failure. If power-off token is used, power on will only be
711  * possible with power button press. If ibm,power-off-ups token is used
712  * it will allow auto poweron after power is restored.
713  */
714 static void pseries_power_off(void)
715 {
716         int rc;
717         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
718
719         if (rtas_flash_term_hook)
720                 rtas_flash_term_hook(SYS_POWER_OFF);
721
722         if (rtas_poweron_auto == 0 ||
723                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
724                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
725                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
726         } else {
727                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
728                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
729         }
730         for (;;);
731 }
732
733 /*
734  * Called very early, MMU is off, device-tree isn't unflattened
735  */
736
737 static int __init pseries_probe_fw_features(unsigned long node,
738                                             const char *uname, int depth,
739                                             void *data)
740 {
741         const char *prop;
742         int len;
743         static int hypertas_found;
744         static int vec5_found;
745
746         if (depth != 1)
747                 return 0;
748
749         if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
750                 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
751                                            &len);
752                 if (prop) {
753                         powerpc_firmware_features |= FW_FEATURE_LPAR;
754                         fw_hypertas_feature_init(prop, len);
755                 }
756
757                 hypertas_found = 1;
758         }
759
760         if (!strcmp(uname, "chosen")) {
761                 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
762                                            &len);
763                 if (prop)
764                         fw_vec5_feature_init(prop, len);
765
766                 vec5_found = 1;
767         }
768
769         return hypertas_found && vec5_found;
770 }
771
772 static int __init pSeries_probe(void)
773 {
774         unsigned long root = of_get_flat_dt_root();
775         const char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
776
777         if (dtype == NULL)
778                 return 0;
779         if (strcmp(dtype, "chrp"))
780                 return 0;
781
782         /* Cell blades firmware claims to be chrp while it's not. Until this
783          * is fixed, we need to avoid those here.
784          */
785         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
786             of_flat_dt_is_compatible(root, "IBM,CBEA"))
787                 return 0;
788
789         pr_debug("pSeries detected, looking for LPAR capability...\n");
790
791         /* Now try to figure out if we are running on LPAR */
792         of_scan_flat_dt(pseries_probe_fw_features, NULL);
793
794 #ifdef __LITTLE_ENDIAN__
795         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
796                 long rc;
797                 /*
798                  * Tell the hypervisor that we want our exceptions to
799                  * be taken in little endian mode. If this fails we don't
800                  * want to use BUG() because it will trigger an exception.
801                  */
802                 rc = pseries_little_endian_exceptions();
803                 if (rc) {
804                         ppc_md.progress("H_SET_MODE LE exception fail", 0);
805                         panic("Could not enable little endian exceptions");
806                 }
807         }
808 #endif
809
810         if (firmware_has_feature(FW_FEATURE_LPAR))
811                 hpte_init_lpar();
812         else
813                 hpte_init_native();
814
815         pm_power_off = pseries_power_off;
816
817         pr_debug("Machine is%s LPAR !\n",
818                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
819
820         return 1;
821 }
822
823 static int pSeries_pci_probe_mode(struct pci_bus *bus)
824 {
825         if (firmware_has_feature(FW_FEATURE_LPAR))
826                 return PCI_PROBE_DEVTREE;
827         return PCI_PROBE_NORMAL;
828 }
829
830 struct pci_controller_ops pseries_pci_controller_ops = {
831         .probe_mode             = pSeries_pci_probe_mode,
832 };
833
834 define_machine(pseries) {
835         .name                   = "pSeries",
836         .probe                  = pSeries_probe,
837         .setup_arch             = pSeries_setup_arch,
838         .init_early             = pSeries_init_early,
839         .show_cpuinfo           = pSeries_show_cpuinfo,
840         .log_error              = pSeries_log_error,
841         .pcibios_fixup          = pSeries_final_fixup,
842         .restart                = rtas_restart,
843         .halt                   = rtas_halt,
844         .panic                  = rtas_os_term,
845         .get_boot_time          = rtas_get_boot_time,
846         .get_rtc_time           = rtas_get_rtc_time,
847         .set_rtc_time           = rtas_set_rtc_time,
848         .calibrate_decr         = generic_calibrate_decr,
849         .progress               = rtas_progress,
850         .system_reset_exception = pSeries_system_reset_exception,
851         .machine_check_exception = pSeries_machine_check_exception,
852 #ifdef CONFIG_KEXEC
853         .machine_kexec          = pSeries_machine_kexec,
854 #endif
855 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
856         .memory_block_size      = pseries_memory_block_size,
857 #endif
858 };