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Merge branch 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
[~andy/linux] / 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/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
71 int CMO_PrPSP = -1;
72 int CMO_SecPSP = -1;
73 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT);
74 EXPORT_SYMBOL(CMO_PageSize);
75
76 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
77
78 static struct device_node *pSeries_mpic_node;
79
80 static 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  */
95 static 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
113 static 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
124 static 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
173 static 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
214 static void __init pseries_xics_init_IRQ(void)
215 {
216         xics_init();
217         pseries_setup_i8259_cascade();
218 }
219
220 static 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
229 static 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
254 static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node)
255 {
256         struct device_node *np = node;
257         struct pci_dn *pci = NULL;
258         int err = NOTIFY_OK;
259
260         switch (action) {
261         case 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
277 static struct notifier_block pci_dn_reconfig_nb = {
278         .notifier_call = pci_dn_reconfig_notifier,
279 };
280
281 struct kmem_cache *dtl_cache;
282
283 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
284 /*
285  * Allocate space for the dispatch trace log for all possible cpus
286  * and register the buffers with the hypervisor.  This is used for
287  * computing time stolen by the hypervisor.
288  */
289 static int alloc_dispatch_logs(void)
290 {
291         int cpu, ret;
292         struct paca_struct *pp;
293         struct dtl_entry *dtl;
294
295         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
296                 return 0;
297
298         if (!dtl_cache)
299                 return 0;
300
301         for_each_possible_cpu(cpu) {
302                 pp = &paca[cpu];
303                 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
304                 if (!dtl) {
305                         pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
306                                 cpu);
307                         pr_warn("Stolen time statistics will be unreliable\n");
308                         break;
309                 }
310
311                 pp->dtl_ridx = 0;
312                 pp->dispatch_log = dtl;
313                 pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
314                 pp->dtl_curr = dtl;
315         }
316
317         /* Register the DTL for the current (boot) cpu */
318         dtl = get_paca()->dispatch_log;
319         get_paca()->dtl_ridx = 0;
320         get_paca()->dtl_curr = dtl;
321         get_paca()->lppaca_ptr->dtl_idx = 0;
322
323         /* hypervisor reads buffer length from this field */
324         dtl->enqueue_to_dispatch_time = 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 */
335 static inline int alloc_dispatch_logs(void)
336 {
337         return 0;
338 }
339 #endif /* CONFIG_VIRT_CPU_ACCOUNTING */
340
341 static int alloc_dispatch_log_kmem_cache(void)
342 {
343         dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
344                                                 DISPATCH_LOG_BYTES, 0, NULL);
345         if (!dtl_cache) {
346                 pr_warn("Failed to create dispatch trace log buffer cache\n");
347                 pr_warn("Stolen time statistics will be unreliable\n");
348                 return 0;
349         }
350
351         return alloc_dispatch_logs();
352 }
353 early_initcall(alloc_dispatch_log_kmem_cache);
354
355 static 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
370 static 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         find_and_init_phbs();
392         pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb);
393
394         pSeries_nvram_init();
395
396         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
397                 vpa_init(boot_cpuid);
398                 ppc_md.power_save = pSeries_idle;
399         }
400
401         if (firmware_has_feature(FW_FEATURE_LPAR))
402                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
403         else
404                 ppc_md.enable_pmcs = power4_enable_pmcs;
405 }
406
407 static int __init pSeries_init_panel(void)
408 {
409         /* Manually leave the kernel version on the panel. */
410         ppc_md.progress("Linux ppc64\n", 0);
411         ppc_md.progress(init_utsname()->version, 0);
412
413         return 0;
414 }
415 machine_arch_initcall(pseries, pSeries_init_panel);
416
417 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
418 {
419         return plpar_hcall_norets(H_SET_DABR, dabr);
420 }
421
422 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
423 {
424         /* Have to set at least one bit in the DABRX according to PAPR */
425         if (dabrx == 0 && dabr == 0)
426                 dabrx = DABRX_USER;
427         /* PAPR says we can only set kernel and user bits */
428         dabrx &= DABRX_KERNEL | DABRX_USER;
429
430         return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
431 }
432
433 #define CMO_CHARACTERISTICS_TOKEN 44
434 #define CMO_MAXLENGTH 1026
435
436 void pSeries_coalesce_init(void)
437 {
438         struct hvcall_mpp_x_data mpp_x_data;
439
440         if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
441                 powerpc_firmware_features |= FW_FEATURE_XCMO;
442         else
443                 powerpc_firmware_features &= ~FW_FEATURE_XCMO;
444 }
445
446 /**
447  * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
448  * handle that here. (Stolen from parse_system_parameter_string)
449  */
450 void pSeries_cmo_feature_init(void)
451 {
452         char *ptr, *key, *value, *end;
453         int call_status;
454         int page_order = IOMMU_PAGE_SHIFT;
455
456         pr_debug(" -> fw_cmo_feature_init()\n");
457         spin_lock(&rtas_data_buf_lock);
458         memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
459         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
460                                 NULL,
461                                 CMO_CHARACTERISTICS_TOKEN,
462                                 __pa(rtas_data_buf),
463                                 RTAS_DATA_BUF_SIZE);
464
465         if (call_status != 0) {
466                 spin_unlock(&rtas_data_buf_lock);
467                 pr_debug("CMO not available\n");
468                 pr_debug(" <- fw_cmo_feature_init()\n");
469                 return;
470         }
471
472         end = rtas_data_buf + CMO_MAXLENGTH - 2;
473         ptr = rtas_data_buf + 2;        /* step over strlen value */
474         key = value = ptr;
475
476         while (*ptr && (ptr <= end)) {
477                 /* Separate the key and value by replacing '=' with '\0' and
478                  * point the value at the string after the '='
479                  */
480                 if (ptr[0] == '=') {
481                         ptr[0] = '\0';
482                         value = ptr + 1;
483                 } else if (ptr[0] == '\0' || ptr[0] == ',') {
484                         /* Terminate the string containing the key/value pair */
485                         ptr[0] = '\0';
486
487                         if (key == value) {
488                                 pr_debug("Malformed key/value pair\n");
489                                 /* Never found a '=', end processing */
490                                 break;
491                         }
492
493                         if (0 == strcmp(key, "CMOPageSize"))
494                                 page_order = simple_strtol(value, NULL, 10);
495                         else if (0 == strcmp(key, "PrPSP"))
496                                 CMO_PrPSP = simple_strtol(value, NULL, 10);
497                         else if (0 == strcmp(key, "SecPSP"))
498                                 CMO_SecPSP = simple_strtol(value, NULL, 10);
499                         value = key = ptr + 1;
500                 }
501                 ptr++;
502         }
503
504         /* Page size is returned as the power of 2 of the page size,
505          * convert to the page size in bytes before returning
506          */
507         CMO_PageSize = 1 << page_order;
508         pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
509
510         if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
511                 pr_info("CMO enabled\n");
512                 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
513                          CMO_SecPSP);
514                 powerpc_firmware_features |= FW_FEATURE_CMO;
515                 pSeries_coalesce_init();
516         } else
517                 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
518                          CMO_SecPSP);
519         spin_unlock(&rtas_data_buf_lock);
520         pr_debug(" <- fw_cmo_feature_init()\n");
521 }
522
523 /*
524  * Early initialization.  Relocation is on but do not reference unbolted pages
525  */
526 static void __init pSeries_init_early(void)
527 {
528         pr_debug(" -> pSeries_init_early()\n");
529
530 #ifdef CONFIG_HVC_CONSOLE
531         if (firmware_has_feature(FW_FEATURE_LPAR))
532                 hvc_vio_init_early();
533 #endif
534         if (firmware_has_feature(FW_FEATURE_XDABR))
535                 ppc_md.set_dabr = pseries_set_xdabr;
536         else if (firmware_has_feature(FW_FEATURE_DABR))
537                 ppc_md.set_dabr = pseries_set_dabr;
538
539         pSeries_cmo_feature_init();
540         iommu_init_early_pSeries();
541
542         pr_debug(" <- pSeries_init_early()\n");
543 }
544
545 /*
546  * Called very early, MMU is off, device-tree isn't unflattened
547  */
548
549 static int __init pSeries_probe_hypertas(unsigned long node,
550                                          const char *uname, int depth,
551                                          void *data)
552 {
553         const char *hypertas;
554         unsigned long len;
555
556         if (depth != 1 ||
557             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
558                 return 0;
559
560         hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
561         if (!hypertas)
562                 return 1;
563
564         powerpc_firmware_features |= FW_FEATURE_LPAR;
565         fw_feature_init(hypertas, len);
566
567         return 1;
568 }
569
570 static int __init pSeries_probe(void)
571 {
572         unsigned long root = of_get_flat_dt_root();
573         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
574
575         if (dtype == NULL)
576                 return 0;
577         if (strcmp(dtype, "chrp"))
578                 return 0;
579
580         /* Cell blades firmware claims to be chrp while it's not. Until this
581          * is fixed, we need to avoid those here.
582          */
583         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
584             of_flat_dt_is_compatible(root, "IBM,CBEA"))
585                 return 0;
586
587         pr_debug("pSeries detected, looking for LPAR capability...\n");
588
589         /* Now try to figure out if we are running on LPAR */
590         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
591
592         if (firmware_has_feature(FW_FEATURE_LPAR))
593                 hpte_init_lpar();
594         else
595                 hpte_init_native();
596
597         pr_debug("Machine is%s LPAR !\n",
598                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
599
600         return 1;
601 }
602
603 static int pSeries_pci_probe_mode(struct pci_bus *bus)
604 {
605         if (firmware_has_feature(FW_FEATURE_LPAR))
606                 return PCI_PROBE_DEVTREE;
607         return PCI_PROBE_NORMAL;
608 }
609
610 /**
611  * pSeries_power_off - tell firmware about how to power off the system.
612  *
613  * This function calls either the power-off rtas token in normal cases
614  * or the ibm,power-off-ups token (if present & requested) in case of
615  * a power failure. If power-off token is used, power on will only be
616  * possible with power button press. If ibm,power-off-ups token is used
617  * it will allow auto poweron after power is restored.
618  */
619 static void pSeries_power_off(void)
620 {
621         int rc;
622         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
623
624         if (rtas_flash_term_hook)
625                 rtas_flash_term_hook(SYS_POWER_OFF);
626
627         if (rtas_poweron_auto == 0 ||
628                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
629                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
630                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
631         } else {
632                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
633                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
634         }
635         for (;;);
636 }
637
638 #ifndef CONFIG_PCI
639 void pSeries_final_fixup(void) { }
640 #endif
641
642 define_machine(pseries) {
643         .name                   = "pSeries",
644         .probe                  = pSeries_probe,
645         .setup_arch             = pSeries_setup_arch,
646         .init_early             = pSeries_init_early,
647         .show_cpuinfo           = pSeries_show_cpuinfo,
648         .log_error              = pSeries_log_error,
649         .pcibios_fixup          = pSeries_final_fixup,
650         .pci_probe_mode         = pSeries_pci_probe_mode,
651         .restart                = rtas_restart,
652         .power_off              = pSeries_power_off,
653         .halt                   = rtas_halt,
654         .panic                  = rtas_os_term,
655         .get_boot_time          = rtas_get_boot_time,
656         .get_rtc_time           = rtas_get_rtc_time,
657         .set_rtc_time           = rtas_set_rtc_time,
658         .calibrate_decr         = generic_calibrate_decr,
659         .progress               = rtas_progress,
660         .system_reset_exception = pSeries_system_reset_exception,
661         .machine_check_exception = pSeries_machine_check_exception,
662 };