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 *data)
255 {
256 	struct of_reconfig_data *rd = data;
257 	struct device_node *np = rd->dn;
258 	struct pci_dn *pci = NULL;
259 	int err = NOTIFY_OK;
260 
261 	switch (action) {
262 	case OF_RECONFIG_ATTACH_NODE:
263 		pci = np->parent->data;
264 		if (pci) {
265 			update_dn_pci_info(np, pci->phb);
266 
267 			/* Create EEH device for the OF node */
268 			eeh_dev_init(np, pci->phb);
269 		}
270 		break;
271 	default:
272 		err = NOTIFY_DONE;
273 		break;
274 	}
275 	return err;
276 }
277 
278 static struct notifier_block pci_dn_reconfig_nb = {
279 	.notifier_call = pci_dn_reconfig_notifier,
280 };
281 
282 struct kmem_cache *dtl_cache;
283 
284 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
285 /*
286  * Allocate space for the dispatch trace log for all possible cpus
287  * and register the buffers with the hypervisor.  This is used for
288  * computing time stolen by the hypervisor.
289  */
290 static int alloc_dispatch_logs(void)
291 {
292 	int cpu, ret;
293 	struct paca_struct *pp;
294 	struct dtl_entry *dtl;
295 
296 	if (!firmware_has_feature(FW_FEATURE_SPLPAR))
297 		return 0;
298 
299 	if (!dtl_cache)
300 		return 0;
301 
302 	for_each_possible_cpu(cpu) {
303 		pp = &paca[cpu];
304 		dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
305 		if (!dtl) {
306 			pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
307 				cpu);
308 			pr_warn("Stolen time statistics will be unreliable\n");
309 			break;
310 		}
311 
312 		pp->dtl_ridx = 0;
313 		pp->dispatch_log = dtl;
314 		pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
315 		pp->dtl_curr = dtl;
316 	}
317 
318 	/* Register the DTL for the current (boot) cpu */
319 	dtl = get_paca()->dispatch_log;
320 	get_paca()->dtl_ridx = 0;
321 	get_paca()->dtl_curr = dtl;
322 	get_paca()->lppaca_ptr->dtl_idx = 0;
323 
324 	/* hypervisor reads buffer length from this field */
325 	dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
326 	ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
327 	if (ret)
328 		pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
329 		       "with %d\n", smp_processor_id(),
330 		       hard_smp_processor_id(), ret);
331 	get_paca()->lppaca_ptr->dtl_enable_mask = 2;
332 
333 	return 0;
334 }
335 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
336 static inline int alloc_dispatch_logs(void)
337 {
338 	return 0;
339 }
340 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
341 
342 static int alloc_dispatch_log_kmem_cache(void)
343 {
344 	dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
345 						DISPATCH_LOG_BYTES, 0, NULL);
346 	if (!dtl_cache) {
347 		pr_warn("Failed to create dispatch trace log buffer cache\n");
348 		pr_warn("Stolen time statistics will be unreliable\n");
349 		return 0;
350 	}
351 
352 	return alloc_dispatch_logs();
353 }
354 machine_early_initcall(pseries, alloc_dispatch_log_kmem_cache);
355 
356 static void pseries_lpar_idle(void)
357 {
358 	/*
359 	 * Default handler to go into low thread priority and possibly
360 	 * low power mode by cedeing processor to hypervisor
361 	 */
362 
363 	/* Indicate to hypervisor that we are idle. */
364 	get_lppaca()->idle = 1;
365 
366 	/*
367 	 * Yield the processor to the hypervisor.  We return if
368 	 * an external interrupt occurs (which are driven prior
369 	 * to returning here) or if a prod occurs from another
370 	 * processor. When returning here, external interrupts
371 	 * are enabled.
372 	 */
373 	cede_processor();
374 
375 	get_lppaca()->idle = 0;
376 }
377 
378 /*
379  * Enable relocation on during exceptions. This has partition wide scope and
380  * may take a while to complete, if it takes longer than one second we will
381  * just give up rather than wasting any more time on this - if that turns out
382  * to ever be a problem in practice we can move this into a kernel thread to
383  * finish off the process later in boot.
384  */
385 long pSeries_enable_reloc_on_exc(void)
386 {
387 	long rc;
388 	unsigned int delay, total_delay = 0;
389 
390 	while (1) {
391 		rc = enable_reloc_on_exceptions();
392 		if (!H_IS_LONG_BUSY(rc))
393 			return rc;
394 
395 		delay = get_longbusy_msecs(rc);
396 		total_delay += delay;
397 		if (total_delay > 1000) {
398 			pr_warn("Warning: Giving up waiting to enable "
399 				"relocation on exceptions (%u msec)!\n",
400 				total_delay);
401 			return rc;
402 		}
403 
404 		mdelay(delay);
405 	}
406 }
407 EXPORT_SYMBOL(pSeries_enable_reloc_on_exc);
408 
409 long pSeries_disable_reloc_on_exc(void)
410 {
411 	long rc;
412 
413 	while (1) {
414 		rc = disable_reloc_on_exceptions();
415 		if (!H_IS_LONG_BUSY(rc))
416 			return rc;
417 		mdelay(get_longbusy_msecs(rc));
418 	}
419 }
420 EXPORT_SYMBOL(pSeries_disable_reloc_on_exc);
421 
422 #ifdef CONFIG_KEXEC
423 static void pSeries_machine_kexec(struct kimage *image)
424 {
425 	long rc;
426 
427 	if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
428 		rc = pSeries_disable_reloc_on_exc();
429 		if (rc != H_SUCCESS)
430 			pr_warning("Warning: Failed to disable relocation on "
431 				   "exceptions: %ld\n", rc);
432 	}
433 
434 	default_machine_kexec(image);
435 }
436 #endif
437 
438 #ifdef __LITTLE_ENDIAN__
439 long pseries_big_endian_exceptions(void)
440 {
441 	long rc;
442 
443 	while (1) {
444 		rc = enable_big_endian_exceptions();
445 		if (!H_IS_LONG_BUSY(rc))
446 			return rc;
447 		mdelay(get_longbusy_msecs(rc));
448 	}
449 }
450 
451 static long pseries_little_endian_exceptions(void)
452 {
453 	long rc;
454 
455 	while (1) {
456 		rc = enable_little_endian_exceptions();
457 		if (!H_IS_LONG_BUSY(rc))
458 			return rc;
459 		mdelay(get_longbusy_msecs(rc));
460 	}
461 }
462 #endif
463 
464 static void __init pSeries_setup_arch(void)
465 {
466 	set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
467 
468 	/* Discover PIC type and setup ppc_md accordingly */
469 	pseries_discover_pic();
470 
471 	/* openpic global configuration register (64-bit format). */
472 	/* openpic Interrupt Source Unit pointer (64-bit format). */
473 	/* python0 facility area (mmio) (64-bit format) REAL address. */
474 
475 	/* init to some ~sane value until calibrate_delay() runs */
476 	loops_per_jiffy = 50000000;
477 
478 	fwnmi_init();
479 
480 	/* By default, only probe PCI (can be overriden by rtas_pci) */
481 	pci_add_flags(PCI_PROBE_ONLY);
482 
483 	/* Find and initialize PCI host bridges */
484 	init_pci_config_tokens();
485 	find_and_init_phbs();
486 	of_reconfig_notifier_register(&pci_dn_reconfig_nb);
487 
488 	pSeries_nvram_init();
489 
490 	if (firmware_has_feature(FW_FEATURE_LPAR)) {
491 		vpa_init(boot_cpuid);
492 		ppc_md.power_save = pseries_lpar_idle;
493 		ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
494 	} else {
495 		/* No special idle routine */
496 		ppc_md.enable_pmcs = power4_enable_pmcs;
497 	}
498 
499 	ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
500 
501 	if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
502 		long rc;
503 
504 		rc = pSeries_enable_reloc_on_exc();
505 		if (rc == H_P2) {
506 			pr_info("Relocation on exceptions not supported\n");
507 		} else if (rc != H_SUCCESS) {
508 			pr_warn("Unable to enable relocation on exceptions: "
509 				"%ld\n", rc);
510 		}
511 	}
512 }
513 
514 static int __init pSeries_init_panel(void)
515 {
516 	/* Manually leave the kernel version on the panel. */
517 #ifdef __BIG_ENDIAN__
518 	ppc_md.progress("Linux ppc64\n", 0);
519 #else
520 	ppc_md.progress("Linux ppc64le\n", 0);
521 #endif
522 	ppc_md.progress(init_utsname()->version, 0);
523 
524 	return 0;
525 }
526 machine_arch_initcall(pseries, pSeries_init_panel);
527 
528 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
529 {
530 	return plpar_hcall_norets(H_SET_DABR, dabr);
531 }
532 
533 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
534 {
535 	/* Have to set at least one bit in the DABRX according to PAPR */
536 	if (dabrx == 0 && dabr == 0)
537 		dabrx = DABRX_USER;
538 	/* PAPR says we can only set kernel and user bits */
539 	dabrx &= DABRX_KERNEL | DABRX_USER;
540 
541 	return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
542 }
543 
544 static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx)
545 {
546 	/* PAPR says we can't set HYP */
547 	dawrx &= ~DAWRX_HYP;
548 
549 	return  plapr_set_watchpoint0(dawr, dawrx);
550 }
551 
552 #define CMO_CHARACTERISTICS_TOKEN 44
553 #define CMO_MAXLENGTH 1026
554 
555 void pSeries_coalesce_init(void)
556 {
557 	struct hvcall_mpp_x_data mpp_x_data;
558 
559 	if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
560 		powerpc_firmware_features |= FW_FEATURE_XCMO;
561 	else
562 		powerpc_firmware_features &= ~FW_FEATURE_XCMO;
563 }
564 
565 /**
566  * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
567  * handle that here. (Stolen from parse_system_parameter_string)
568  */
569 static void pSeries_cmo_feature_init(void)
570 {
571 	char *ptr, *key, *value, *end;
572 	int call_status;
573 	int page_order = IOMMU_PAGE_SHIFT_4K;
574 
575 	pr_debug(" -> fw_cmo_feature_init()\n");
576 	spin_lock(&rtas_data_buf_lock);
577 	memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
578 	call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
579 				NULL,
580 				CMO_CHARACTERISTICS_TOKEN,
581 				__pa(rtas_data_buf),
582 				RTAS_DATA_BUF_SIZE);
583 
584 	if (call_status != 0) {
585 		spin_unlock(&rtas_data_buf_lock);
586 		pr_debug("CMO not available\n");
587 		pr_debug(" <- fw_cmo_feature_init()\n");
588 		return;
589 	}
590 
591 	end = rtas_data_buf + CMO_MAXLENGTH - 2;
592 	ptr = rtas_data_buf + 2;	/* step over strlen value */
593 	key = value = ptr;
594 
595 	while (*ptr && (ptr <= end)) {
596 		/* Separate the key and value by replacing '=' with '\0' and
597 		 * point the value at the string after the '='
598 		 */
599 		if (ptr[0] == '=') {
600 			ptr[0] = '\0';
601 			value = ptr + 1;
602 		} else if (ptr[0] == '\0' || ptr[0] == ',') {
603 			/* Terminate the string containing the key/value pair */
604 			ptr[0] = '\0';
605 
606 			if (key == value) {
607 				pr_debug("Malformed key/value pair\n");
608 				/* Never found a '=', end processing */
609 				break;
610 			}
611 
612 			if (0 == strcmp(key, "CMOPageSize"))
613 				page_order = simple_strtol(value, NULL, 10);
614 			else if (0 == strcmp(key, "PrPSP"))
615 				CMO_PrPSP = simple_strtol(value, NULL, 10);
616 			else if (0 == strcmp(key, "SecPSP"))
617 				CMO_SecPSP = simple_strtol(value, NULL, 10);
618 			value = key = ptr + 1;
619 		}
620 		ptr++;
621 	}
622 
623 	/* Page size is returned as the power of 2 of the page size,
624 	 * convert to the page size in bytes before returning
625 	 */
626 	CMO_PageSize = 1 << page_order;
627 	pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
628 
629 	if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
630 		pr_info("CMO enabled\n");
631 		pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
632 		         CMO_SecPSP);
633 		powerpc_firmware_features |= FW_FEATURE_CMO;
634 		pSeries_coalesce_init();
635 	} else
636 		pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
637 		         CMO_SecPSP);
638 	spin_unlock(&rtas_data_buf_lock);
639 	pr_debug(" <- fw_cmo_feature_init()\n");
640 }
641 
642 /*
643  * Early initialization.  Relocation is on but do not reference unbolted pages
644  */
645 static void __init pSeries_init_early(void)
646 {
647 	pr_debug(" -> pSeries_init_early()\n");
648 
649 #ifdef CONFIG_HVC_CONSOLE
650 	if (firmware_has_feature(FW_FEATURE_LPAR))
651 		hvc_vio_init_early();
652 #endif
653 	if (firmware_has_feature(FW_FEATURE_XDABR))
654 		ppc_md.set_dabr = pseries_set_xdabr;
655 	else if (firmware_has_feature(FW_FEATURE_DABR))
656 		ppc_md.set_dabr = pseries_set_dabr;
657 
658 	if (firmware_has_feature(FW_FEATURE_SET_MODE))
659 		ppc_md.set_dawr = pseries_set_dawr;
660 
661 	pSeries_cmo_feature_init();
662 	iommu_init_early_pSeries();
663 
664 	pr_debug(" <- pSeries_init_early()\n");
665 }
666 
667 /**
668  * pseries_power_off - tell firmware about how to power off the system.
669  *
670  * This function calls either the power-off rtas token in normal cases
671  * or the ibm,power-off-ups token (if present & requested) in case of
672  * a power failure. If power-off token is used, power on will only be
673  * possible with power button press. If ibm,power-off-ups token is used
674  * it will allow auto poweron after power is restored.
675  */
676 static void pseries_power_off(void)
677 {
678 	int rc;
679 	int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
680 
681 	if (rtas_flash_term_hook)
682 		rtas_flash_term_hook(SYS_POWER_OFF);
683 
684 	if (rtas_poweron_auto == 0 ||
685 		rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
686 		rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
687 		printk(KERN_INFO "RTAS power-off returned %d\n", rc);
688 	} else {
689 		rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
690 		printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
691 	}
692 	for (;;);
693 }
694 
695 /*
696  * Called very early, MMU is off, device-tree isn't unflattened
697  */
698 
699 static int __init pseries_probe_fw_features(unsigned long node,
700 					    const char *uname, int depth,
701 					    void *data)
702 {
703 	const char *prop;
704 	int len;
705 	static int hypertas_found;
706 	static int vec5_found;
707 
708 	if (depth != 1)
709 		return 0;
710 
711 	if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
712 		prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
713 					   &len);
714 		if (prop) {
715 			powerpc_firmware_features |= FW_FEATURE_LPAR;
716 			fw_hypertas_feature_init(prop, len);
717 		}
718 
719 		hypertas_found = 1;
720 	}
721 
722 	if (!strcmp(uname, "chosen")) {
723 		prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
724 					   &len);
725 		if (prop)
726 			fw_vec5_feature_init(prop, len);
727 
728 		vec5_found = 1;
729 	}
730 
731 	return hypertas_found && vec5_found;
732 }
733 
734 static int __init pSeries_probe(void)
735 {
736 	unsigned long root = of_get_flat_dt_root();
737 	const char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
738 
739  	if (dtype == NULL)
740  		return 0;
741  	if (strcmp(dtype, "chrp"))
742 		return 0;
743 
744 	/* Cell blades firmware claims to be chrp while it's not. Until this
745 	 * is fixed, we need to avoid those here.
746 	 */
747 	if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
748 	    of_flat_dt_is_compatible(root, "IBM,CBEA"))
749 		return 0;
750 
751 	pr_debug("pSeries detected, looking for LPAR capability...\n");
752 
753 	/* Now try to figure out if we are running on LPAR */
754 	of_scan_flat_dt(pseries_probe_fw_features, NULL);
755 
756 #ifdef __LITTLE_ENDIAN__
757 	if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
758 		long rc;
759 		/*
760 		 * Tell the hypervisor that we want our exceptions to
761 		 * be taken in little endian mode. If this fails we don't
762 		 * want to use BUG() because it will trigger an exception.
763 		 */
764 		rc = pseries_little_endian_exceptions();
765 		if (rc) {
766 			ppc_md.progress("H_SET_MODE LE exception fail", 0);
767 			panic("Could not enable little endian exceptions");
768 		}
769 	}
770 #endif
771 
772 	if (firmware_has_feature(FW_FEATURE_LPAR))
773 		hpte_init_lpar();
774 	else
775 		hpte_init_native();
776 
777 	pm_power_off = pseries_power_off;
778 
779 	pr_debug("Machine is%s LPAR !\n",
780 	         (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
781 
782 	return 1;
783 }
784 
785 static int pSeries_pci_probe_mode(struct pci_bus *bus)
786 {
787 	if (firmware_has_feature(FW_FEATURE_LPAR))
788 		return PCI_PROBE_DEVTREE;
789 	return PCI_PROBE_NORMAL;
790 }
791 
792 #ifndef CONFIG_PCI
793 void pSeries_final_fixup(void) { }
794 #endif
795 
796 define_machine(pseries) {
797 	.name			= "pSeries",
798 	.probe			= pSeries_probe,
799 	.setup_arch		= pSeries_setup_arch,
800 	.init_early		= pSeries_init_early,
801 	.show_cpuinfo		= pSeries_show_cpuinfo,
802 	.log_error		= pSeries_log_error,
803 	.pcibios_fixup		= pSeries_final_fixup,
804 	.pci_probe_mode		= pSeries_pci_probe_mode,
805 	.restart		= rtas_restart,
806 	.halt			= rtas_halt,
807 	.panic			= rtas_os_term,
808 	.get_boot_time		= rtas_get_boot_time,
809 	.get_rtc_time		= rtas_get_rtc_time,
810 	.set_rtc_time		= rtas_set_rtc_time,
811 	.calibrate_decr		= generic_calibrate_decr,
812 	.progress		= rtas_progress,
813 	.system_reset_exception = pSeries_system_reset_exception,
814 	.machine_check_exception = pSeries_machine_check_exception,
815 #ifdef CONFIG_KEXEC
816 	.machine_kexec          = pSeries_machine_kexec,
817 #endif
818 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
819 	.memory_block_size	= pseries_memory_block_size,
820 #endif
821 };
822