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
pSeries_show_cpuinfo(struct seq_file * m)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 */
fwnmi_init(void)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
pseries_8259_cascade(unsigned int irq,struct irq_desc * desc)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
pseries_setup_i8259_cascade(void)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
pseries_mpic_init_IRQ(void)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
pseries_xics_init_IRQ(void)216 static void __init pseries_xics_init_IRQ(void)
217 {
218 xics_init();
219 pseries_setup_i8259_cascade();
220 }
221
pseries_lpar_enable_pmcs(void)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
pseries_discover_pic(void)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
pci_dn_reconfig_notifier(struct notifier_block * nb,unsigned long action,void * node)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 */
alloc_dispatch_logs(void)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 */
alloc_dispatch_logs(void)337 static inline int alloc_dispatch_logs(void)
338 {
339 return 0;
340 }
341 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
342
alloc_dispatch_log_kmem_cache(void)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
pSeries_idle(void)357 static void pSeries_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.
366 */
367 HMT_low();
368 HMT_very_low();
369 }
370 }
371
372 /*
373 * Enable relocation on during exceptions. This has partition wide scope and
374 * may take a while to complete, if it takes longer than one second we will
375 * just give up rather than wasting any more time on this - if that turns out
376 * to ever be a problem in practice we can move this into a kernel thread to
377 * finish off the process later in boot.
378 */
pSeries_enable_reloc_on_exc(void)379 long pSeries_enable_reloc_on_exc(void)
380 {
381 long rc;
382 unsigned int delay, total_delay = 0;
383
384 while (1) {
385 rc = enable_reloc_on_exceptions();
386 if (!H_IS_LONG_BUSY(rc))
387 return rc;
388
389 delay = get_longbusy_msecs(rc);
390 total_delay += delay;
391 if (total_delay > 1000) {
392 pr_warn("Warning: Giving up waiting to enable "
393 "relocation on exceptions (%u msec)!\n",
394 total_delay);
395 return rc;
396 }
397
398 mdelay(delay);
399 }
400 }
401 EXPORT_SYMBOL(pSeries_enable_reloc_on_exc);
402
pSeries_disable_reloc_on_exc(void)403 long pSeries_disable_reloc_on_exc(void)
404 {
405 long rc;
406
407 while (1) {
408 rc = disable_reloc_on_exceptions();
409 if (!H_IS_LONG_BUSY(rc))
410 return rc;
411 mdelay(get_longbusy_msecs(rc));
412 }
413 }
414 EXPORT_SYMBOL(pSeries_disable_reloc_on_exc);
415
416 #ifdef CONFIG_KEXEC
pSeries_machine_kexec(struct kimage * image)417 static void pSeries_machine_kexec(struct kimage *image)
418 {
419 long rc;
420
421 if (firmware_has_feature(FW_FEATURE_SET_MODE) &&
422 (image->type != KEXEC_TYPE_CRASH)) {
423 rc = pSeries_disable_reloc_on_exc();
424 if (rc != H_SUCCESS)
425 pr_warning("Warning: Failed to disable relocation on "
426 "exceptions: %ld\n", rc);
427 }
428
429 default_machine_kexec(image);
430 }
431 #endif
432
pSeries_setup_arch(void)433 static void __init pSeries_setup_arch(void)
434 {
435 panic_timeout = 10;
436
437 /* Discover PIC type and setup ppc_md accordingly */
438 pseries_discover_pic();
439
440 /* openpic global configuration register (64-bit format). */
441 /* openpic Interrupt Source Unit pointer (64-bit format). */
442 /* python0 facility area (mmio) (64-bit format) REAL address. */
443
444 /* init to some ~sane value until calibrate_delay() runs */
445 loops_per_jiffy = 50000000;
446
447 fwnmi_init();
448
449 /* By default, only probe PCI (can be overriden by rtas_pci) */
450 pci_add_flags(PCI_PROBE_ONLY);
451
452 /* Find and initialize PCI host bridges */
453 init_pci_config_tokens();
454 find_and_init_phbs();
455 of_reconfig_notifier_register(&pci_dn_reconfig_nb);
456
457 pSeries_nvram_init();
458
459 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
460 vpa_init(boot_cpuid);
461 ppc_md.power_save = pSeries_idle;
462 }
463
464 if (firmware_has_feature(FW_FEATURE_LPAR))
465 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
466 else
467 ppc_md.enable_pmcs = power4_enable_pmcs;
468
469 ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
470
471 if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
472 long rc;
473 if ((rc = pSeries_enable_reloc_on_exc()) != H_SUCCESS) {
474 pr_warn("Unable to enable relocation on exceptions: "
475 "%ld\n", rc);
476 }
477 }
478 }
479
pSeries_init_panel(void)480 static int __init pSeries_init_panel(void)
481 {
482 /* Manually leave the kernel version on the panel. */
483 ppc_md.progress("Linux ppc64\n", 0);
484 ppc_md.progress(init_utsname()->version, 0);
485
486 return 0;
487 }
488 machine_arch_initcall(pseries, pSeries_init_panel);
489
pseries_set_dabr(unsigned long dabr,unsigned long dabrx)490 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
491 {
492 return plpar_hcall_norets(H_SET_DABR, dabr);
493 }
494
pseries_set_xdabr(unsigned long dabr,unsigned long dabrx)495 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
496 {
497 /* Have to set at least one bit in the DABRX according to PAPR */
498 if (dabrx == 0 && dabr == 0)
499 dabrx = DABRX_USER;
500 /* PAPR says we can only set kernel and user bits */
501 dabrx &= DABRX_KERNEL | DABRX_USER;
502
503 return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
504 }
505
pseries_set_dawr(unsigned long dawr,unsigned long dawrx)506 static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx)
507 {
508 /* PAPR says we can't set HYP */
509 dawrx &= ~DAWRX_HYP;
510
511 return plapr_set_watchpoint0(dawr, dawrx);
512 }
513
514 #define CMO_CHARACTERISTICS_TOKEN 44
515 #define CMO_MAXLENGTH 1026
516
pSeries_coalesce_init(void)517 void pSeries_coalesce_init(void)
518 {
519 struct hvcall_mpp_x_data mpp_x_data;
520
521 if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
522 powerpc_firmware_features |= FW_FEATURE_XCMO;
523 else
524 powerpc_firmware_features &= ~FW_FEATURE_XCMO;
525 }
526
527 /**
528 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
529 * handle that here. (Stolen from parse_system_parameter_string)
530 */
pSeries_cmo_feature_init(void)531 void pSeries_cmo_feature_init(void)
532 {
533 char *ptr, *key, *value, *end;
534 int call_status;
535 int page_order = IOMMU_PAGE_SHIFT;
536
537 pr_debug(" -> fw_cmo_feature_init()\n");
538 spin_lock(&rtas_data_buf_lock);
539 memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
540 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
541 NULL,
542 CMO_CHARACTERISTICS_TOKEN,
543 __pa(rtas_data_buf),
544 RTAS_DATA_BUF_SIZE);
545
546 if (call_status != 0) {
547 spin_unlock(&rtas_data_buf_lock);
548 pr_debug("CMO not available\n");
549 pr_debug(" <- fw_cmo_feature_init()\n");
550 return;
551 }
552
553 end = rtas_data_buf + CMO_MAXLENGTH - 2;
554 ptr = rtas_data_buf + 2; /* step over strlen value */
555 key = value = ptr;
556
557 while (*ptr && (ptr <= end)) {
558 /* Separate the key and value by replacing '=' with '\0' and
559 * point the value at the string after the '='
560 */
561 if (ptr[0] == '=') {
562 ptr[0] = '\0';
563 value = ptr + 1;
564 } else if (ptr[0] == '\0' || ptr[0] == ',') {
565 /* Terminate the string containing the key/value pair */
566 ptr[0] = '\0';
567
568 if (key == value) {
569 pr_debug("Malformed key/value pair\n");
570 /* Never found a '=', end processing */
571 break;
572 }
573
574 if (0 == strcmp(key, "CMOPageSize"))
575 page_order = simple_strtol(value, NULL, 10);
576 else if (0 == strcmp(key, "PrPSP"))
577 CMO_PrPSP = simple_strtol(value, NULL, 10);
578 else if (0 == strcmp(key, "SecPSP"))
579 CMO_SecPSP = simple_strtol(value, NULL, 10);
580 value = key = ptr + 1;
581 }
582 ptr++;
583 }
584
585 /* Page size is returned as the power of 2 of the page size,
586 * convert to the page size in bytes before returning
587 */
588 CMO_PageSize = 1 << page_order;
589 pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
590
591 if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
592 pr_info("CMO enabled\n");
593 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
594 CMO_SecPSP);
595 powerpc_firmware_features |= FW_FEATURE_CMO;
596 pSeries_coalesce_init();
597 } else
598 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
599 CMO_SecPSP);
600 spin_unlock(&rtas_data_buf_lock);
601 pr_debug(" <- fw_cmo_feature_init()\n");
602 }
603
604 /*
605 * Early initialization. Relocation is on but do not reference unbolted pages
606 */
pSeries_init_early(void)607 static void __init pSeries_init_early(void)
608 {
609 pr_debug(" -> pSeries_init_early()\n");
610
611 #ifdef CONFIG_HVC_CONSOLE
612 if (firmware_has_feature(FW_FEATURE_LPAR))
613 hvc_vio_init_early();
614 #endif
615 if (firmware_has_feature(FW_FEATURE_XDABR))
616 ppc_md.set_dabr = pseries_set_xdabr;
617 else if (firmware_has_feature(FW_FEATURE_DABR))
618 ppc_md.set_dabr = pseries_set_dabr;
619
620 if (firmware_has_feature(FW_FEATURE_SET_MODE))
621 ppc_md.set_dawr = pseries_set_dawr;
622
623 pSeries_cmo_feature_init();
624 iommu_init_early_pSeries();
625
626 pr_debug(" <- pSeries_init_early()\n");
627 }
628
629 /*
630 * Called very early, MMU is off, device-tree isn't unflattened
631 */
632
pseries_probe_fw_features(unsigned long node,const char * uname,int depth,void * data)633 static int __init pseries_probe_fw_features(unsigned long node,
634 const char *uname, int depth,
635 void *data)
636 {
637 const char *prop;
638 unsigned long len;
639 static int hypertas_found;
640 static int vec5_found;
641
642 if (depth != 1)
643 return 0;
644
645 if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
646 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
647 &len);
648 if (prop) {
649 powerpc_firmware_features |= FW_FEATURE_LPAR;
650 fw_hypertas_feature_init(prop, len);
651 }
652
653 hypertas_found = 1;
654 }
655
656 if (!strcmp(uname, "chosen")) {
657 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
658 &len);
659 if (prop)
660 fw_vec5_feature_init(prop, len);
661
662 vec5_found = 1;
663 }
664
665 return hypertas_found && vec5_found;
666 }
667
pSeries_probe(void)668 static int __init pSeries_probe(void)
669 {
670 unsigned long root = of_get_flat_dt_root();
671 char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
672
673 if (dtype == NULL)
674 return 0;
675 if (strcmp(dtype, "chrp"))
676 return 0;
677
678 /* Cell blades firmware claims to be chrp while it's not. Until this
679 * is fixed, we need to avoid those here.
680 */
681 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
682 of_flat_dt_is_compatible(root, "IBM,CBEA"))
683 return 0;
684
685 pr_debug("pSeries detected, looking for LPAR capability...\n");
686
687 /* Now try to figure out if we are running on LPAR */
688 of_scan_flat_dt(pseries_probe_fw_features, NULL);
689
690 if (firmware_has_feature(FW_FEATURE_LPAR))
691 hpte_init_lpar();
692 else
693 hpte_init_native();
694
695 pr_debug("Machine is%s LPAR !\n",
696 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
697
698 return 1;
699 }
700
pSeries_pci_probe_mode(struct pci_bus * bus)701 static int pSeries_pci_probe_mode(struct pci_bus *bus)
702 {
703 if (firmware_has_feature(FW_FEATURE_LPAR))
704 return PCI_PROBE_DEVTREE;
705 return PCI_PROBE_NORMAL;
706 }
707
708 /**
709 * pSeries_power_off - tell firmware about how to power off the system.
710 *
711 * This function calls either the power-off rtas token in normal cases
712 * or the ibm,power-off-ups token (if present & requested) in case of
713 * a power failure. If power-off token is used, power on will only be
714 * possible with power button press. If ibm,power-off-ups token is used
715 * it will allow auto poweron after power is restored.
716 */
pSeries_power_off(void)717 static void pSeries_power_off(void)
718 {
719 int rc;
720 int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
721
722 if (rtas_flash_term_hook)
723 rtas_flash_term_hook(SYS_POWER_OFF);
724
725 if (rtas_poweron_auto == 0 ||
726 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
727 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
728 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
729 } else {
730 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
731 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
732 }
733 for (;;);
734 }
735
736 #ifndef CONFIG_PCI
pSeries_final_fixup(void)737 void pSeries_final_fixup(void) { }
738 #endif
739
define_machine(pseries)740 define_machine(pseries) {
741 .name = "pSeries",
742 .probe = pSeries_probe,
743 .setup_arch = pSeries_setup_arch,
744 .init_early = pSeries_init_early,
745 .show_cpuinfo = pSeries_show_cpuinfo,
746 .log_error = pSeries_log_error,
747 .pcibios_fixup = pSeries_final_fixup,
748 .pci_probe_mode = pSeries_pci_probe_mode,
749 .restart = rtas_restart,
750 .power_off = pSeries_power_off,
751 .halt = rtas_halt,
752 .panic = rtas_os_term,
753 .get_boot_time = rtas_get_boot_time,
754 .get_rtc_time = rtas_get_rtc_time,
755 .set_rtc_time = rtas_set_rtc_time,
756 .calibrate_decr = generic_calibrate_decr,
757 .progress = rtas_progress,
758 .system_reset_exception = pSeries_system_reset_exception,
759 .machine_check_exception = pSeries_machine_check_exception,
760 #ifdef CONFIG_KEXEC
761 .machine_kexec = pSeries_machine_kexec,
762 #endif
763 };
764