Remove asm/a.out.h files for all architectures without a.out support.
[linux-3.10.git] / 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
67 #include "plpar_wrappers.h"
68 #include "pseries.h"
69
70 int CMO_PrPSP = -1;
71 int CMO_SecPSP = -1;
72 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT);
73 EXPORT_SYMBOL(CMO_PageSize);
74
75 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
76
77 static void pseries_shared_idle_sleep(void);
78 static void pseries_dedicated_idle_sleep(void);
79
80 static struct device_node *pSeries_mpic_node;
81
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  */
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
115 static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
116 {
117         unsigned int cascade_irq = i8259_irq();
118         if (cascade_irq != NO_IRQ)
119                 generic_handle_irq(cascade_irq);
120         desc->chip->eoi(irq);
121 }
122
123 static void __init pseries_setup_i8259_cascade(void)
124 {
125         struct device_node *np, *old, *found = NULL;
126         unsigned int cascade;
127         const u32 *addrp;
128         unsigned long intack = 0;
129         int naddr;
130
131         for_each_node_by_type(np, "interrupt-controller") {
132                 if (of_device_is_compatible(np, "chrp,iic")) {
133                         found = np;
134                         break;
135                 }
136         }
137
138         if (found == NULL) {
139                 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
140                 return;
141         }
142
143         cascade = irq_of_parse_and_map(found, 0);
144         if (cascade == NO_IRQ) {
145                 printk(KERN_ERR "pic: failed to map cascade interrupt");
146                 return;
147         }
148         pr_debug("pic: cascade mapped to irq %d\n", cascade);
149
150         for (old = of_node_get(found); old != NULL ; old = np) {
151                 np = of_get_parent(old);
152                 of_node_put(old);
153                 if (np == NULL)
154                         break;
155                 if (strcmp(np->name, "pci") != 0)
156                         continue;
157                 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
158                 if (addrp == NULL)
159                         continue;
160                 naddr = of_n_addr_cells(np);
161                 intack = addrp[naddr-1];
162                 if (naddr > 1)
163                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
164         }
165         if (intack)
166                 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
167         i8259_init(found, intack);
168         of_node_put(found);
169         set_irq_chained_handler(cascade, pseries_8259_cascade);
170 }
171
172 static void __init pseries_mpic_init_IRQ(void)
173 {
174         struct device_node *np;
175         const unsigned int *opprop;
176         unsigned long openpic_addr = 0;
177         int naddr, n, i, opplen;
178         struct mpic *mpic;
179
180         np = of_find_node_by_path("/");
181         naddr = of_n_addr_cells(np);
182         opprop = of_get_property(np, "platform-open-pic", &opplen);
183         if (opprop != 0) {
184                 openpic_addr = of_read_number(opprop, naddr);
185                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
186         }
187         of_node_put(np);
188
189         BUG_ON(openpic_addr == 0);
190
191         /* Setup the openpic driver */
192         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
193                           MPIC_PRIMARY,
194                           16, 250, /* isu size, irq count */
195                           " 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         /* All ISUs are setup, complete initialization */
206         mpic_init(mpic);
207
208         /* Look for cascade */
209         pseries_setup_i8259_cascade();
210 }
211
212 static void __init pseries_xics_init_IRQ(void)
213 {
214         xics_init_IRQ();
215         pseries_setup_i8259_cascade();
216 }
217
218 static void pseries_lpar_enable_pmcs(void)
219 {
220         unsigned long set, reset;
221
222         set = 1UL << 63;
223         reset = 0;
224         plpar_hcall_norets(H_PERFMON, set, reset);
225
226         /* instruct hypervisor to maintain PMCs */
227         if (firmware_has_feature(FW_FEATURE_SPLPAR))
228                 get_lppaca()->pmcregs_in_use = 1;
229 }
230
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                         ppc_md.get_irq        = mpic_get_irq;
243                         setup_kexec_cpu_down_mpic();
244                         smp_init_pseries_mpic();
245                         return;
246                 } else if (strstr(typep, "ppc-xicp")) {
247                         ppc_md.init_IRQ       = pseries_xics_init_IRQ;
248                         setup_kexec_cpu_down_xics();
249                         smp_init_pseries_xics();
250                         return;
251                 }
252         }
253         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
254                " interrupt-controller\n");
255 }
256
257 static void __init pSeries_setup_arch(void)
258 {
259         /* Discover PIC type and setup ppc_md accordingly */
260         pseries_discover_pic();
261
262         /* openpic global configuration register (64-bit format). */
263         /* openpic Interrupt Source Unit pointer (64-bit format). */
264         /* python0 facility area (mmio) (64-bit format) REAL address. */
265
266         /* init to some ~sane value until calibrate_delay() runs */
267         loops_per_jiffy = 50000000;
268
269         fwnmi_init();
270
271         /* Find and initialize PCI host bridges */
272         init_pci_config_tokens();
273         find_and_init_phbs();
274         eeh_init();
275
276         pSeries_nvram_init();
277
278         /* Choose an idle loop */
279         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
280                 vpa_init(boot_cpuid);
281                 if (get_lppaca()->shared_proc) {
282                         printk(KERN_DEBUG "Using shared processor idle loop\n");
283                         ppc_md.power_save = pseries_shared_idle_sleep;
284                 } else {
285                         printk(KERN_DEBUG "Using dedicated idle loop\n");
286                         ppc_md.power_save = pseries_dedicated_idle_sleep;
287                 }
288         } else {
289                 printk(KERN_DEBUG "Using default idle loop\n");
290         }
291
292         if (firmware_has_feature(FW_FEATURE_LPAR))
293                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
294         else
295                 ppc_md.enable_pmcs = power4_enable_pmcs;
296 }
297
298 static int __init pSeries_init_panel(void)
299 {
300         /* Manually leave the kernel version on the panel. */
301         ppc_md.progress("Linux ppc64\n", 0);
302         ppc_md.progress(init_utsname()->version, 0);
303
304         return 0;
305 }
306 arch_initcall(pSeries_init_panel);
307
308 static int pseries_set_dabr(unsigned long dabr)
309 {
310         return plpar_hcall_norets(H_SET_DABR, dabr);
311 }
312
313 static int pseries_set_xdabr(unsigned long dabr)
314 {
315         /* We want to catch accesses from kernel and userspace */
316         return plpar_hcall_norets(H_SET_XDABR, dabr,
317                         H_DABRX_KERNEL | H_DABRX_USER);
318 }
319
320 #define CMO_CHARACTERISTICS_TOKEN 44
321 #define CMO_MAXLENGTH 1026
322
323 /**
324  * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
325  * handle that here. (Stolen from parse_system_parameter_string)
326  */
327 void pSeries_cmo_feature_init(void)
328 {
329         char *ptr, *key, *value, *end;
330         int call_status;
331         int page_order = IOMMU_PAGE_SHIFT;
332
333         pr_debug(" -> fw_cmo_feature_init()\n");
334         spin_lock(&rtas_data_buf_lock);
335         memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
336         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
337                                 NULL,
338                                 CMO_CHARACTERISTICS_TOKEN,
339                                 __pa(rtas_data_buf),
340                                 RTAS_DATA_BUF_SIZE);
341
342         if (call_status != 0) {
343                 spin_unlock(&rtas_data_buf_lock);
344                 pr_debug("CMO not available\n");
345                 pr_debug(" <- fw_cmo_feature_init()\n");
346                 return;
347         }
348
349         end = rtas_data_buf + CMO_MAXLENGTH - 2;
350         ptr = rtas_data_buf + 2;        /* step over strlen value */
351         key = value = ptr;
352
353         while (*ptr && (ptr <= end)) {
354                 /* Separate the key and value by replacing '=' with '\0' and
355                  * point the value at the string after the '='
356                  */
357                 if (ptr[0] == '=') {
358                         ptr[0] = '\0';
359                         value = ptr + 1;
360                 } else if (ptr[0] == '\0' || ptr[0] == ',') {
361                         /* Terminate the string containing the key/value pair */
362                         ptr[0] = '\0';
363
364                         if (key == value) {
365                                 pr_debug("Malformed key/value pair\n");
366                                 /* Never found a '=', end processing */
367                                 break;
368                         }
369
370                         if (0 == strcmp(key, "CMOPageSize"))
371                                 page_order = simple_strtol(value, NULL, 10);
372                         else if (0 == strcmp(key, "PrPSP"))
373                                 CMO_PrPSP = simple_strtol(value, NULL, 10);
374                         else if (0 == strcmp(key, "SecPSP"))
375                                 CMO_SecPSP = simple_strtol(value, NULL, 10);
376                         value = key = ptr + 1;
377                 }
378                 ptr++;
379         }
380
381         /* Page size is returned as the power of 2 of the page size,
382          * convert to the page size in bytes before returning
383          */
384         CMO_PageSize = 1 << page_order;
385         pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
386
387         if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
388                 pr_info("CMO enabled\n");
389                 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
390                          CMO_SecPSP);
391                 powerpc_firmware_features |= FW_FEATURE_CMO;
392         } else
393                 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
394                          CMO_SecPSP);
395         spin_unlock(&rtas_data_buf_lock);
396         pr_debug(" <- fw_cmo_feature_init()\n");
397 }
398
399 /*
400  * Early initialization.  Relocation is on but do not reference unbolted pages
401  */
402 static void __init pSeries_init_early(void)
403 {
404         pr_debug(" -> pSeries_init_early()\n");
405
406         if (firmware_has_feature(FW_FEATURE_LPAR))
407                 find_udbg_vterm();
408
409         if (firmware_has_feature(FW_FEATURE_DABR))
410                 ppc_md.set_dabr = pseries_set_dabr;
411         else if (firmware_has_feature(FW_FEATURE_XDABR))
412                 ppc_md.set_dabr = pseries_set_xdabr;
413
414         pSeries_cmo_feature_init();
415         iommu_init_early_pSeries();
416
417         pr_debug(" <- pSeries_init_early()\n");
418 }
419
420 /*
421  * Called very early, MMU is off, device-tree isn't unflattened
422  */
423
424 static int __init pSeries_probe_hypertas(unsigned long node,
425                                          const char *uname, int depth,
426                                          void *data)
427 {
428         const char *hypertas;
429         unsigned long len;
430
431         if (depth != 1 ||
432             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
433                 return 0;
434
435         hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
436         if (!hypertas)
437                 return 1;
438
439         powerpc_firmware_features |= FW_FEATURE_LPAR;
440         fw_feature_init(hypertas, len);
441
442         return 1;
443 }
444
445 static int __init pSeries_probe(void)
446 {
447         unsigned long root = of_get_flat_dt_root();
448         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
449
450         if (dtype == NULL)
451                 return 0;
452         if (strcmp(dtype, "chrp"))
453                 return 0;
454
455         /* Cell blades firmware claims to be chrp while it's not. Until this
456          * is fixed, we need to avoid those here.
457          */
458         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
459             of_flat_dt_is_compatible(root, "IBM,CBEA"))
460                 return 0;
461
462         pr_debug("pSeries detected, looking for LPAR capability...\n");
463
464         /* Now try to figure out if we are running on LPAR */
465         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
466
467         if (firmware_has_feature(FW_FEATURE_LPAR))
468                 hpte_init_lpar();
469         else
470                 hpte_init_native();
471
472         pr_debug("Machine is%s LPAR !\n",
473                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
474
475         return 1;
476 }
477
478
479 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
480
481 static void pseries_dedicated_idle_sleep(void)
482
483         unsigned int cpu = smp_processor_id();
484         unsigned long start_snooze;
485         unsigned long in_purr, out_purr;
486
487         /*
488          * Indicate to the HV that we are idle. Now would be
489          * a good time to find other work to dispatch.
490          */
491         get_lppaca()->idle = 1;
492         get_lppaca()->donate_dedicated_cpu = 1;
493         in_purr = mfspr(SPRN_PURR);
494
495         /*
496          * We come in with interrupts disabled, and need_resched()
497          * has been checked recently.  If we should poll for a little
498          * while, do so.
499          */
500         if (__get_cpu_var(smt_snooze_delay)) {
501                 start_snooze = get_tb() +
502                         __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
503                 local_irq_enable();
504                 set_thread_flag(TIF_POLLING_NRFLAG);
505
506                 while (get_tb() < start_snooze) {
507                         if (need_resched() || cpu_is_offline(cpu))
508                                 goto out;
509                         ppc64_runlatch_off();
510                         HMT_low();
511                         HMT_very_low();
512                 }
513
514                 HMT_medium();
515                 clear_thread_flag(TIF_POLLING_NRFLAG);
516                 smp_mb();
517                 local_irq_disable();
518                 if (need_resched() || cpu_is_offline(cpu))
519                         goto out;
520         }
521
522         cede_processor();
523
524 out:
525         HMT_medium();
526         out_purr = mfspr(SPRN_PURR);
527         get_lppaca()->wait_state_cycles += out_purr - in_purr;
528         get_lppaca()->donate_dedicated_cpu = 0;
529         get_lppaca()->idle = 0;
530 }
531
532 static void pseries_shared_idle_sleep(void)
533 {
534         /*
535          * Indicate to the HV that we are idle. Now would be
536          * a good time to find other work to dispatch.
537          */
538         get_lppaca()->idle = 1;
539
540         /*
541          * Yield the processor to the hypervisor.  We return if
542          * an external interrupt occurs (which are driven prior
543          * to returning here) or if a prod occurs from another
544          * processor. When returning here, external interrupts
545          * are enabled.
546          */
547         cede_processor();
548
549         get_lppaca()->idle = 0;
550 }
551
552 static int pSeries_pci_probe_mode(struct pci_bus *bus)
553 {
554         if (firmware_has_feature(FW_FEATURE_LPAR))
555                 return PCI_PROBE_DEVTREE;
556         return PCI_PROBE_NORMAL;
557 }
558
559 /**
560  * pSeries_power_off - tell firmware about how to power off the system.
561  *
562  * This function calls either the power-off rtas token in normal cases
563  * or the ibm,power-off-ups token (if present & requested) in case of
564  * a power failure. If power-off token is used, power on will only be
565  * possible with power button press. If ibm,power-off-ups token is used
566  * it will allow auto poweron after power is restored.
567  */
568 static void pSeries_power_off(void)
569 {
570         int rc;
571         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
572
573         if (rtas_flash_term_hook)
574                 rtas_flash_term_hook(SYS_POWER_OFF);
575
576         if (rtas_poweron_auto == 0 ||
577                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
578                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
579                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
580         } else {
581                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
582                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
583         }
584         for (;;);
585 }
586
587 #ifndef CONFIG_PCI
588 void pSeries_final_fixup(void) { }
589 #endif
590
591 define_machine(pseries) {
592         .name                   = "pSeries",
593         .probe                  = pSeries_probe,
594         .setup_arch             = pSeries_setup_arch,
595         .init_early             = pSeries_init_early,
596         .show_cpuinfo           = pSeries_show_cpuinfo,
597         .log_error              = pSeries_log_error,
598         .pcibios_fixup          = pSeries_final_fixup,
599         .pci_probe_mode         = pSeries_pci_probe_mode,
600         .restart                = rtas_restart,
601         .power_off              = pSeries_power_off,
602         .halt                   = rtas_halt,
603         .panic                  = rtas_os_term,
604         .get_boot_time          = rtas_get_boot_time,
605         .get_rtc_time           = rtas_get_rtc_time,
606         .set_rtc_time           = rtas_set_rtc_time,
607         .calibrate_decr         = generic_calibrate_decr,
608         .progress               = rtas_progress,
609         .system_reset_exception = pSeries_system_reset_exception,
610         .machine_check_exception = pSeries_machine_check_exception,
611 };