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
44#include <asm/mmu.h>
45#include <asm/processor.h>
46#include <asm/io.h>
47#include <asm/pgtable.h>
48#include <asm/prom.h>
49#include <asm/rtas.h>
50#include <asm/pci-bridge.h>
51#include <asm/iommu.h>
52#include <asm/dma.h>
53#include <asm/machdep.h>
54#include <asm/irq.h>
55#include <asm/time.h>
56#include <asm/nvram.h>
57#include <asm/pmc.h>
58#include <asm/mpic.h>
59#include <asm/xics.h>
60#include <asm/ppc-pci.h>
61#include <asm/i8259.h>
62#include <asm/udbg.h>
63#include <asm/smp.h>
64#include <asm/firmware.h>
65#include <asm/eeh.h>
66#include <asm/pSeries_reconfig.h>
67
68#include "plpar_wrappers.h"
69#include "pseries.h"
70
71int CMO_PrPSP = -1;
72int CMO_SecPSP = -1;
73unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT);
74EXPORT_SYMBOL(CMO_PageSize);
75
76int fwnmi_active;  /* TRUE if an FWNMI handler is present */
77
78static struct device_node *pSeries_mpic_node;
79
80static void pSeries_show_cpuinfo(struct seq_file *m)
81{
82	struct device_node *root;
83	const char *model = "";
84
85	root = of_find_node_by_path("/");
86	if (root)
87		model = of_get_property(root, "model", NULL);
88	seq_printf(m, "machine\t\t: CHRP %s\n", model);
89	of_node_put(root);
90}
91
92/* Initialize firmware assisted non-maskable interrupts if
93 * the firmware supports this feature.
94 */
95static void __init fwnmi_init(void)
96{
97	unsigned long system_reset_addr, machine_check_addr;
98
99	int ibm_nmi_register = rtas_token("ibm,nmi-register");
100	if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
101		return;
102
103	/* If the kernel's not linked at zero we point the firmware at low
104	 * addresses anyway, and use a trampoline to get to the real code. */
105	system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
106	machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
107
108	if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
109				machine_check_addr))
110		fwnmi_active = 1;
111}
112
113static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
114{
115	struct irq_chip *chip = irq_desc_get_chip(desc);
116	unsigned int cascade_irq = i8259_irq();
117
118	if (cascade_irq != NO_IRQ)
119		generic_handle_irq(cascade_irq);
120
121	chip->irq_eoi(&desc->irq_data);
122}
123
124static void __init pseries_setup_i8259_cascade(void)
125{
126	struct device_node *np, *old, *found = NULL;
127	unsigned int cascade;
128	const u32 *addrp;
129	unsigned long intack = 0;
130	int naddr;
131
132	for_each_node_by_type(np, "interrupt-controller") {
133		if (of_device_is_compatible(np, "chrp,iic")) {
134			found = np;
135			break;
136		}
137	}
138
139	if (found == NULL) {
140		printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
141		return;
142	}
143
144	cascade = irq_of_parse_and_map(found, 0);
145	if (cascade == NO_IRQ) {
146		printk(KERN_ERR "pic: failed to map cascade interrupt");
147		return;
148	}
149	pr_debug("pic: cascade mapped to irq %d\n", cascade);
150
151	for (old = of_node_get(found); old != NULL ; old = np) {
152		np = of_get_parent(old);
153		of_node_put(old);
154		if (np == NULL)
155			break;
156		if (strcmp(np->name, "pci") != 0)
157			continue;
158		addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
159		if (addrp == NULL)
160			continue;
161		naddr = of_n_addr_cells(np);
162		intack = addrp[naddr-1];
163		if (naddr > 1)
164			intack |= ((unsigned long)addrp[naddr-2]) << 32;
165	}
166	if (intack)
167		printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
168	i8259_init(found, intack);
169	of_node_put(found);
170	irq_set_chained_handler(cascade, pseries_8259_cascade);
171}
172
173static void __init pseries_mpic_init_IRQ(void)
174{
175	struct device_node *np;
176	const unsigned int *opprop;
177	unsigned long openpic_addr = 0;
178	int naddr, n, i, opplen;
179	struct mpic *mpic;
180
181	np = of_find_node_by_path("/");
182	naddr = of_n_addr_cells(np);
183	opprop = of_get_property(np, "platform-open-pic", &opplen);
184	if (opprop != 0) {
185		openpic_addr = of_read_number(opprop, naddr);
186		printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
187	}
188	of_node_put(np);
189
190	BUG_ON(openpic_addr == 0);
191
192	/* Setup the openpic driver */
193	mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
194			MPIC_NO_RESET, 16, 0, " MPIC     ");
195	BUG_ON(mpic == NULL);
196
197	/* Add ISUs */
198	opplen /= sizeof(u32);
199	for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
200		unsigned long isuaddr = of_read_number(opprop + i, naddr);
201		mpic_assign_isu(mpic, n, isuaddr);
202	}
203
204	/* Setup top-level get_irq */
205	ppc_md.get_irq = mpic_get_irq;
206
207	/* All ISUs are setup, complete initialization */
208	mpic_init(mpic);
209
210	/* Look for cascade */
211	pseries_setup_i8259_cascade();
212}
213
214static void __init pseries_xics_init_IRQ(void)
215{
216	xics_init();
217	pseries_setup_i8259_cascade();
218}
219
220static void pseries_lpar_enable_pmcs(void)
221{
222	unsigned long set, reset;
223
224	set = 1UL << 63;
225	reset = 0;
226	plpar_hcall_norets(H_PERFMON, set, reset);
227}
228
229static void __init pseries_discover_pic(void)
230{
231	struct device_node *np;
232	const char *typep;
233
234	for (np = NULL; (np = of_find_node_by_name(np,
235						   "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
254static 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 PSERIES_RECONFIG_ADD:
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
277static struct notifier_block pci_dn_reconfig_nb = {
278	.notifier_call = pci_dn_reconfig_notifier,
279};
280
281struct kmem_cache *dtl_cache;
282
283#ifdef CONFIG_VIRT_CPU_ACCOUNTING
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 */
289static 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 = 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 */
335static inline int alloc_dispatch_logs(void)
336{
337	return 0;
338}
339#endif /* CONFIG_VIRT_CPU_ACCOUNTING */
340
341static 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}
353early_initcall(alloc_dispatch_log_kmem_cache);
354
355static void pSeries_idle(void)
356{
357	/* This would call on the cpuidle framework, and the back-end pseries
358	 * driver to  go to idle states
359	 */
360	if (cpuidle_idle_call()) {
361		/* On error, execute default handler
362		 * to go into low thread priority and possibly
363		 * low power mode.
364		 */
365		HMT_low();
366		HMT_very_low();
367	}
368}
369
370static void __init pSeries_setup_arch(void)
371{
372	panic_timeout = 10;
373
374	/* Discover PIC type and setup ppc_md accordingly */
375	pseries_discover_pic();
376
377	/* openpic global configuration register (64-bit format). */
378	/* openpic Interrupt Source Unit pointer (64-bit format). */
379	/* python0 facility area (mmio) (64-bit format) REAL address. */
380
381	/* init to some ~sane value until calibrate_delay() runs */
382	loops_per_jiffy = 50000000;
383
384	fwnmi_init();
385
386	/* By default, only probe PCI (can be overriden by rtas_pci) */
387	pci_add_flags(PCI_PROBE_ONLY);
388
389	/* Find and initialize PCI host bridges */
390	init_pci_config_tokens();
391	eeh_pseries_init();
392	find_and_init_phbs();
393	pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb);
394	eeh_init();
395
396	pSeries_nvram_init();
397
398	if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
399		vpa_init(boot_cpuid);
400		ppc_md.power_save = pSeries_idle;
401	}
402
403	if (firmware_has_feature(FW_FEATURE_LPAR))
404		ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
405	else
406		ppc_md.enable_pmcs = power4_enable_pmcs;
407}
408
409static int __init pSeries_init_panel(void)
410{
411	/* Manually leave the kernel version on the panel. */
412	ppc_md.progress("Linux ppc64\n", 0);
413	ppc_md.progress(init_utsname()->version, 0);
414
415	return 0;
416}
417machine_arch_initcall(pseries, pSeries_init_panel);
418
419static int pseries_set_dabr(unsigned long dabr)
420{
421	return plpar_hcall_norets(H_SET_DABR, dabr);
422}
423
424static int pseries_set_xdabr(unsigned long dabr)
425{
426	/* We want to catch accesses from kernel and userspace */
427	return plpar_hcall_norets(H_SET_XDABR, dabr,
428			H_DABRX_KERNEL | H_DABRX_USER);
429}
430
431#define CMO_CHARACTERISTICS_TOKEN 44
432#define CMO_MAXLENGTH 1026
433
434void pSeries_coalesce_init(void)
435{
436	struct hvcall_mpp_x_data mpp_x_data;
437
438	if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
439		powerpc_firmware_features |= FW_FEATURE_XCMO;
440	else
441		powerpc_firmware_features &= ~FW_FEATURE_XCMO;
442}
443
444/**
445 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
446 * handle that here. (Stolen from parse_system_parameter_string)
447 */
448void pSeries_cmo_feature_init(void)
449{
450	char *ptr, *key, *value, *end;
451	int call_status;
452	int page_order = IOMMU_PAGE_SHIFT;
453
454	pr_debug(" -> fw_cmo_feature_init()\n");
455	spin_lock(&rtas_data_buf_lock);
456	memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
457	call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
458				NULL,
459				CMO_CHARACTERISTICS_TOKEN,
460				__pa(rtas_data_buf),
461				RTAS_DATA_BUF_SIZE);
462
463	if (call_status != 0) {
464		spin_unlock(&rtas_data_buf_lock);
465		pr_debug("CMO not available\n");
466		pr_debug(" <- fw_cmo_feature_init()\n");
467		return;
468	}
469
470	end = rtas_data_buf + CMO_MAXLENGTH - 2;
471	ptr = rtas_data_buf + 2;	/* step over strlen value */
472	key = value = ptr;
473
474	while (*ptr && (ptr <= end)) {
475		/* Separate the key and value by replacing '=' with '\0' and
476		 * point the value at the string after the '='
477		 */
478		if (ptr[0] == '=') {
479			ptr[0] = '\0';
480			value = ptr + 1;
481		} else if (ptr[0] == '\0' || ptr[0] == ',') {
482			/* Terminate the string containing the key/value pair */
483			ptr[0] = '\0';
484
485			if (key == value) {
486				pr_debug("Malformed key/value pair\n");
487				/* Never found a '=', end processing */
488				break;
489			}
490
491			if (0 == strcmp(key, "CMOPageSize"))
492				page_order = simple_strtol(value, NULL, 10);
493			else if (0 == strcmp(key, "PrPSP"))
494				CMO_PrPSP = simple_strtol(value, NULL, 10);
495			else if (0 == strcmp(key, "SecPSP"))
496				CMO_SecPSP = simple_strtol(value, NULL, 10);
497			value = key = ptr + 1;
498		}
499		ptr++;
500	}
501
502	/* Page size is returned as the power of 2 of the page size,
503	 * convert to the page size in bytes before returning
504	 */
505	CMO_PageSize = 1 << page_order;
506	pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
507
508	if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
509		pr_info("CMO enabled\n");
510		pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
511		         CMO_SecPSP);
512		powerpc_firmware_features |= FW_FEATURE_CMO;
513		pSeries_coalesce_init();
514	} else
515		pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
516		         CMO_SecPSP);
517	spin_unlock(&rtas_data_buf_lock);
518	pr_debug(" <- fw_cmo_feature_init()\n");
519}
520
521/*
522 * Early initialization.  Relocation is on but do not reference unbolted pages
523 */
524static void __init pSeries_init_early(void)
525{
526	pr_debug(" -> pSeries_init_early()\n");
527
528#ifdef CONFIG_HVC_CONSOLE
529	if (firmware_has_feature(FW_FEATURE_LPAR))
530		hvc_vio_init_early();
531#endif
532	if (firmware_has_feature(FW_FEATURE_DABR))
533		ppc_md.set_dabr = pseries_set_dabr;
534	else if (firmware_has_feature(FW_FEATURE_XDABR))
535		ppc_md.set_dabr = pseries_set_xdabr;
536
537	pSeries_cmo_feature_init();
538	iommu_init_early_pSeries();
539
540	pr_debug(" <- pSeries_init_early()\n");
541}
542
543/*
544 * Called very early, MMU is off, device-tree isn't unflattened
545 */
546
547static int __init pSeries_probe_hypertas(unsigned long node,
548					 const char *uname, int depth,
549					 void *data)
550{
551	const char *hypertas;
552	unsigned long len;
553
554	if (depth != 1 ||
555	    (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
556		return 0;
557
558	hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
559	if (!hypertas)
560		return 1;
561
562	powerpc_firmware_features |= FW_FEATURE_LPAR;
563	fw_feature_init(hypertas, len);
564
565	return 1;
566}
567
568static int __init pSeries_probe(void)
569{
570	unsigned long root = of_get_flat_dt_root();
571 	char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
572
573 	if (dtype == NULL)
574 		return 0;
575 	if (strcmp(dtype, "chrp"))
576		return 0;
577
578	/* Cell blades firmware claims to be chrp while it's not. Until this
579	 * is fixed, we need to avoid those here.
580	 */
581	if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
582	    of_flat_dt_is_compatible(root, "IBM,CBEA"))
583		return 0;
584
585	pr_debug("pSeries detected, looking for LPAR capability...\n");
586
587	/* Now try to figure out if we are running on LPAR */
588	of_scan_flat_dt(pSeries_probe_hypertas, NULL);
589
590	if (firmware_has_feature(FW_FEATURE_LPAR))
591		hpte_init_lpar();
592	else
593		hpte_init_native();
594
595	pr_debug("Machine is%s LPAR !\n",
596	         (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
597
598	return 1;
599}
600
601static int pSeries_pci_probe_mode(struct pci_bus *bus)
602{
603	if (firmware_has_feature(FW_FEATURE_LPAR))
604		return PCI_PROBE_DEVTREE;
605	return PCI_PROBE_NORMAL;
606}
607
608/**
609 * pSeries_power_off - tell firmware about how to power off the system.
610 *
611 * This function calls either the power-off rtas token in normal cases
612 * or the ibm,power-off-ups token (if present & requested) in case of
613 * a power failure. If power-off token is used, power on will only be
614 * possible with power button press. If ibm,power-off-ups token is used
615 * it will allow auto poweron after power is restored.
616 */
617static void pSeries_power_off(void)
618{
619	int rc;
620	int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
621
622	if (rtas_flash_term_hook)
623		rtas_flash_term_hook(SYS_POWER_OFF);
624
625	if (rtas_poweron_auto == 0 ||
626		rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
627		rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
628		printk(KERN_INFO "RTAS power-off returned %d\n", rc);
629	} else {
630		rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
631		printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
632	}
633	for (;;);
634}
635
636#ifndef CONFIG_PCI
637void pSeries_final_fixup(void) { }
638#endif
639
640define_machine(pseries) {
641	.name			= "pSeries",
642	.probe			= pSeries_probe,
643	.setup_arch		= pSeries_setup_arch,
644	.init_early		= pSeries_init_early,
645	.show_cpuinfo		= pSeries_show_cpuinfo,
646	.log_error		= pSeries_log_error,
647	.pcibios_fixup		= pSeries_final_fixup,
648	.pci_probe_mode		= pSeries_pci_probe_mode,
649	.restart		= rtas_restart,
650	.power_off		= pSeries_power_off,
651	.halt			= rtas_halt,
652	.panic			= rtas_os_term,
653	.get_boot_time		= rtas_get_boot_time,
654	.get_rtc_time		= rtas_get_rtc_time,
655	.set_rtc_time		= rtas_set_rtc_time,
656	.calibrate_decr		= generic_calibrate_decr,
657	.progress		= rtas_progress,
658	.system_reset_exception = pSeries_system_reset_exception,
659	.machine_check_exception = pSeries_machine_check_exception,
660};
661