Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
[linux-2.6] / 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/slab.h>
27 #include <linux/user.h>
28 #include <linux/tty.h>
29 #include <linux/major.h>
30 #include <linux/interrupt.h>
31 #include <linux/reboot.h>
32 #include <linux/init.h>
33 #include <linux/ioport.h>
34 #include <linux/console.h>
35 #include <linux/pci.h>
36 #include <linux/utsname.h>
37 #include <linux/adb.h>
38 #include <linux/module.h>
39 #include <linux/delay.h>
40 #include <linux/irq.h>
41 #include <linux/seq_file.h>
42 #include <linux/root_dev.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 "xics.h"
58 #include <asm/pmc.h>
59 #include <asm/mpic.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 void pseries_shared_idle_sleep(void);
79 static void pseries_dedicated_idle_sleep(void);
80
81 static struct device_node *pSeries_mpic_node;
82
83 static void pSeries_show_cpuinfo(struct seq_file *m)
84 {
85         struct device_node *root;
86         const char *model = "";
87
88         root = of_find_node_by_path("/");
89         if (root)
90                 model = of_get_property(root, "model", NULL);
91         seq_printf(m, "machine\t\t: CHRP %s\n", model);
92         of_node_put(root);
93 }
94
95 /* Initialize firmware assisted non-maskable interrupts if
96  * the firmware supports this feature.
97  */
98 static void __init fwnmi_init(void)
99 {
100         unsigned long system_reset_addr, machine_check_addr;
101
102         int ibm_nmi_register = rtas_token("ibm,nmi-register");
103         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
104                 return;
105
106         /* If the kernel's not linked at zero we point the firmware at low
107          * addresses anyway, and use a trampoline to get to the real code. */
108         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
109         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
110
111         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
112                                 machine_check_addr))
113                 fwnmi_active = 1;
114 }
115
116 static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
117 {
118         unsigned int cascade_irq = i8259_irq();
119         if (cascade_irq != NO_IRQ)
120                 generic_handle_irq(cascade_irq);
121         desc->chip->eoi(irq);
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         set_irq_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_PRIMARY,
195                           16, 250, /* isu size, irq count */
196                           " 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         /* All ISUs are setup, complete initialization */
207         mpic_init(mpic);
208
209         /* Look for cascade */
210         pseries_setup_i8259_cascade();
211 }
212
213 static void __init pseries_xics_init_IRQ(void)
214 {
215         xics_init_IRQ();
216         pseries_setup_i8259_cascade();
217 }
218
219 static void pseries_lpar_enable_pmcs(void)
220 {
221         unsigned long set, reset;
222
223         set = 1UL << 63;
224         reset = 0;
225         plpar_hcall_norets(H_PERFMON, set, reset);
226
227         /* instruct hypervisor to maintain PMCs */
228         if (firmware_has_feature(FW_FEATURE_SPLPAR))
229                 get_lppaca()->pmcregs_in_use = 1;
230 }
231
232 static void __init pseries_discover_pic(void)
233 {
234         struct device_node *np;
235         const char *typep;
236
237         for (np = NULL; (np = of_find_node_by_name(np,
238                                                    "interrupt-controller"));) {
239                 typep = of_get_property(np, "compatible", NULL);
240                 if (strstr(typep, "open-pic")) {
241                         pSeries_mpic_node = of_node_get(np);
242                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
243                         ppc_md.get_irq        = mpic_get_irq;
244                         setup_kexec_cpu_down_mpic();
245                         smp_init_pseries_mpic();
246                         return;
247                 } else if (strstr(typep, "ppc-xicp")) {
248                         ppc_md.init_IRQ       = pseries_xics_init_IRQ;
249                         setup_kexec_cpu_down_xics();
250                         smp_init_pseries_xics();
251                         return;
252                 }
253         }
254         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
255                " interrupt-controller\n");
256 }
257
258 static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node)
259 {
260         struct device_node *np = node;
261         struct pci_dn *pci = NULL;
262         int err = NOTIFY_OK;
263
264         switch (action) {
265         case PSERIES_RECONFIG_ADD:
266                 pci = np->parent->data;
267                 if (pci)
268                         update_dn_pci_info(np, pci->phb);
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 static void __init pSeries_setup_arch(void)
282 {
283         /* Discover PIC type and setup ppc_md accordingly */
284         pseries_discover_pic();
285
286         /* openpic global configuration register (64-bit format). */
287         /* openpic Interrupt Source Unit pointer (64-bit format). */
288         /* python0 facility area (mmio) (64-bit format) REAL address. */
289
290         /* init to some ~sane value until calibrate_delay() runs */
291         loops_per_jiffy = 50000000;
292
293         fwnmi_init();
294
295         /* Find and initialize PCI host bridges */
296         init_pci_config_tokens();
297         find_and_init_phbs();
298         pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb);
299         eeh_init();
300
301         pSeries_nvram_init();
302
303         /* Choose an idle loop */
304         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
305                 vpa_init(boot_cpuid);
306                 if (get_lppaca()->shared_proc) {
307                         printk(KERN_DEBUG "Using shared processor idle loop\n");
308                         ppc_md.power_save = pseries_shared_idle_sleep;
309                 } else {
310                         printk(KERN_DEBUG "Using dedicated idle loop\n");
311                         ppc_md.power_save = pseries_dedicated_idle_sleep;
312                 }
313         } else {
314                 printk(KERN_DEBUG "Using default idle loop\n");
315         }
316
317         if (firmware_has_feature(FW_FEATURE_LPAR))
318                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
319         else
320                 ppc_md.enable_pmcs = power4_enable_pmcs;
321 }
322
323 static int __init pSeries_init_panel(void)
324 {
325         /* Manually leave the kernel version on the panel. */
326         ppc_md.progress("Linux ppc64\n", 0);
327         ppc_md.progress(init_utsname()->version, 0);
328
329         return 0;
330 }
331 arch_initcall(pSeries_init_panel);
332
333 static int pseries_set_dabr(unsigned long dabr)
334 {
335         return plpar_hcall_norets(H_SET_DABR, dabr);
336 }
337
338 static int pseries_set_xdabr(unsigned long dabr)
339 {
340         /* We want to catch accesses from kernel and userspace */
341         return plpar_hcall_norets(H_SET_XDABR, dabr,
342                         H_DABRX_KERNEL | H_DABRX_USER);
343 }
344
345 #define CMO_CHARACTERISTICS_TOKEN 44
346 #define CMO_MAXLENGTH 1026
347
348 /**
349  * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
350  * handle that here. (Stolen from parse_system_parameter_string)
351  */
352 void pSeries_cmo_feature_init(void)
353 {
354         char *ptr, *key, *value, *end;
355         int call_status;
356         int page_order = IOMMU_PAGE_SHIFT;
357
358         pr_debug(" -> fw_cmo_feature_init()\n");
359         spin_lock(&rtas_data_buf_lock);
360         memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
361         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
362                                 NULL,
363                                 CMO_CHARACTERISTICS_TOKEN,
364                                 __pa(rtas_data_buf),
365                                 RTAS_DATA_BUF_SIZE);
366
367         if (call_status != 0) {
368                 spin_unlock(&rtas_data_buf_lock);
369                 pr_debug("CMO not available\n");
370                 pr_debug(" <- fw_cmo_feature_init()\n");
371                 return;
372         }
373
374         end = rtas_data_buf + CMO_MAXLENGTH - 2;
375         ptr = rtas_data_buf + 2;        /* step over strlen value */
376         key = value = ptr;
377
378         while (*ptr && (ptr <= end)) {
379                 /* Separate the key and value by replacing '=' with '\0' and
380                  * point the value at the string after the '='
381                  */
382                 if (ptr[0] == '=') {
383                         ptr[0] = '\0';
384                         value = ptr + 1;
385                 } else if (ptr[0] == '\0' || ptr[0] == ',') {
386                         /* Terminate the string containing the key/value pair */
387                         ptr[0] = '\0';
388
389                         if (key == value) {
390                                 pr_debug("Malformed key/value pair\n");
391                                 /* Never found a '=', end processing */
392                                 break;
393                         }
394
395                         if (0 == strcmp(key, "CMOPageSize"))
396                                 page_order = simple_strtol(value, NULL, 10);
397                         else if (0 == strcmp(key, "PrPSP"))
398                                 CMO_PrPSP = simple_strtol(value, NULL, 10);
399                         else if (0 == strcmp(key, "SecPSP"))
400                                 CMO_SecPSP = simple_strtol(value, NULL, 10);
401                         value = key = ptr + 1;
402                 }
403                 ptr++;
404         }
405
406         /* Page size is returned as the power of 2 of the page size,
407          * convert to the page size in bytes before returning
408          */
409         CMO_PageSize = 1 << page_order;
410         pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
411
412         if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
413                 pr_info("CMO enabled\n");
414                 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
415                          CMO_SecPSP);
416                 powerpc_firmware_features |= FW_FEATURE_CMO;
417         } else
418                 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
419                          CMO_SecPSP);
420         spin_unlock(&rtas_data_buf_lock);
421         pr_debug(" <- fw_cmo_feature_init()\n");
422 }
423
424 /*
425  * Early initialization.  Relocation is on but do not reference unbolted pages
426  */
427 static void __init pSeries_init_early(void)
428 {
429         pr_debug(" -> pSeries_init_early()\n");
430
431         if (firmware_has_feature(FW_FEATURE_LPAR))
432                 find_udbg_vterm();
433
434         if (firmware_has_feature(FW_FEATURE_DABR))
435                 ppc_md.set_dabr = pseries_set_dabr;
436         else if (firmware_has_feature(FW_FEATURE_XDABR))
437                 ppc_md.set_dabr = pseries_set_xdabr;
438
439         pSeries_cmo_feature_init();
440         iommu_init_early_pSeries();
441
442         pr_debug(" <- pSeries_init_early()\n");
443 }
444
445 /*
446  * Called very early, MMU is off, device-tree isn't unflattened
447  */
448
449 static int __init pSeries_probe_hypertas(unsigned long node,
450                                          const char *uname, int depth,
451                                          void *data)
452 {
453         const char *hypertas;
454         unsigned long len;
455
456         if (depth != 1 ||
457             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
458                 return 0;
459
460         hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
461         if (!hypertas)
462                 return 1;
463
464         powerpc_firmware_features |= FW_FEATURE_LPAR;
465         fw_feature_init(hypertas, len);
466
467         return 1;
468 }
469
470 static int __init pSeries_probe(void)
471 {
472         unsigned long root = of_get_flat_dt_root();
473         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
474
475         if (dtype == NULL)
476                 return 0;
477         if (strcmp(dtype, "chrp"))
478                 return 0;
479
480         /* Cell blades firmware claims to be chrp while it's not. Until this
481          * is fixed, we need to avoid those here.
482          */
483         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
484             of_flat_dt_is_compatible(root, "IBM,CBEA"))
485                 return 0;
486
487         pr_debug("pSeries detected, looking for LPAR capability...\n");
488
489         /* Now try to figure out if we are running on LPAR */
490         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
491
492         if (firmware_has_feature(FW_FEATURE_LPAR))
493                 hpte_init_lpar();
494         else
495                 hpte_init_native();
496
497         pr_debug("Machine is%s LPAR !\n",
498                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
499
500         return 1;
501 }
502
503
504 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
505
506 static void pseries_dedicated_idle_sleep(void)
507
508         unsigned int cpu = smp_processor_id();
509         unsigned long start_snooze;
510         unsigned long in_purr, out_purr;
511
512         /*
513          * Indicate to the HV that we are idle. Now would be
514          * a good time to find other work to dispatch.
515          */
516         get_lppaca()->idle = 1;
517         get_lppaca()->donate_dedicated_cpu = 1;
518         in_purr = mfspr(SPRN_PURR);
519
520         /*
521          * We come in with interrupts disabled, and need_resched()
522          * has been checked recently.  If we should poll for a little
523          * while, do so.
524          */
525         if (__get_cpu_var(smt_snooze_delay)) {
526                 start_snooze = get_tb() +
527                         __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
528                 local_irq_enable();
529                 set_thread_flag(TIF_POLLING_NRFLAG);
530
531                 while (get_tb() < start_snooze) {
532                         if (need_resched() || cpu_is_offline(cpu))
533                                 goto out;
534                         ppc64_runlatch_off();
535                         HMT_low();
536                         HMT_very_low();
537                 }
538
539                 HMT_medium();
540                 clear_thread_flag(TIF_POLLING_NRFLAG);
541                 smp_mb();
542                 local_irq_disable();
543                 if (need_resched() || cpu_is_offline(cpu))
544                         goto out;
545         }
546
547         cede_processor();
548
549 out:
550         HMT_medium();
551         out_purr = mfspr(SPRN_PURR);
552         get_lppaca()->wait_state_cycles += out_purr - in_purr;
553         get_lppaca()->donate_dedicated_cpu = 0;
554         get_lppaca()->idle = 0;
555 }
556
557 static void pseries_shared_idle_sleep(void)
558 {
559         /*
560          * Indicate to the HV that we are idle. Now would be
561          * a good time to find other work to dispatch.
562          */
563         get_lppaca()->idle = 1;
564
565         /*
566          * Yield the processor to the hypervisor.  We return if
567          * an external interrupt occurs (which are driven prior
568          * to returning here) or if a prod occurs from another
569          * processor. When returning here, external interrupts
570          * are enabled.
571          */
572         cede_processor();
573
574         get_lppaca()->idle = 0;
575 }
576
577 static int pSeries_pci_probe_mode(struct pci_bus *bus)
578 {
579         if (firmware_has_feature(FW_FEATURE_LPAR))
580                 return PCI_PROBE_DEVTREE;
581         return PCI_PROBE_NORMAL;
582 }
583
584 /**
585  * pSeries_power_off - tell firmware about how to power off the system.
586  *
587  * This function calls either the power-off rtas token in normal cases
588  * or the ibm,power-off-ups token (if present & requested) in case of
589  * a power failure. If power-off token is used, power on will only be
590  * possible with power button press. If ibm,power-off-ups token is used
591  * it will allow auto poweron after power is restored.
592  */
593 static void pSeries_power_off(void)
594 {
595         int rc;
596         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
597
598         if (rtas_flash_term_hook)
599                 rtas_flash_term_hook(SYS_POWER_OFF);
600
601         if (rtas_poweron_auto == 0 ||
602                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
603                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
604                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
605         } else {
606                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
607                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
608         }
609         for (;;);
610 }
611
612 #ifndef CONFIG_PCI
613 void pSeries_final_fixup(void) { }
614 #endif
615
616 define_machine(pseries) {
617         .name                   = "pSeries",
618         .probe                  = pSeries_probe,
619         .setup_arch             = pSeries_setup_arch,
620         .init_early             = pSeries_init_early,
621         .show_cpuinfo           = pSeries_show_cpuinfo,
622         .log_error              = pSeries_log_error,
623         .pcibios_fixup          = pSeries_final_fixup,
624         .pci_probe_mode         = pSeries_pci_probe_mode,
625         .restart                = rtas_restart,
626         .power_off              = pSeries_power_off,
627         .halt                   = rtas_halt,
628         .panic                  = rtas_os_term,
629         .get_boot_time          = rtas_get_boot_time,
630         .get_rtc_time           = rtas_get_rtc_time,
631         .set_rtc_time           = rtas_set_rtc_time,
632         .calibrate_decr         = generic_calibrate_decr,
633         .progress               = rtas_progress,
634         .system_reset_exception = pSeries_system_reset_exception,
635         .machine_check_exception = pSeries_machine_check_exception,
636 };