Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband
[linux-2.6] / arch / powerpc / kernel / setup-common.c
1 /*
2  * Common boot and setup code for both 32-bit and 64-bit.
3  * Extracted from arch/powerpc/kernel/setup_64.c.
4  *
5  * Copyright (C) 2001 PPC64 Team, IBM Corp
6  *
7  *      This program is free software; you can redistribute it and/or
8  *      modify it under the terms of the GNU General Public License
9  *      as published by the Free Software Foundation; either version
10  *      2 of the License, or (at your option) any later version.
11  */
12 #include <linux/config.h>
13 #include <linux/module.h>
14 #include <linux/string.h>
15 #include <linux/sched.h>
16 #include <linux/init.h>
17 #include <linux/kernel.h>
18 #include <linux/reboot.h>
19 #include <linux/delay.h>
20 #include <linux/initrd.h>
21 #include <linux/ide.h>
22 #include <linux/seq_file.h>
23 #include <linux/ioport.h>
24 #include <linux/console.h>
25 #include <linux/utsname.h>
26 #include <linux/tty.h>
27 #include <linux/root_dev.h>
28 #include <linux/notifier.h>
29 #include <linux/cpu.h>
30 #include <linux/unistd.h>
31 #include <linux/serial.h>
32 #include <linux/serial_8250.h>
33 #include <asm/io.h>
34 #include <asm/prom.h>
35 #include <asm/processor.h>
36 #include <asm/systemcfg.h>
37 #include <asm/pgtable.h>
38 #include <asm/smp.h>
39 #include <asm/elf.h>
40 #include <asm/machdep.h>
41 #include <asm/time.h>
42 #include <asm/cputable.h>
43 #include <asm/sections.h>
44 #include <asm/btext.h>
45 #include <asm/nvram.h>
46 #include <asm/setup.h>
47 #include <asm/system.h>
48 #include <asm/rtas.h>
49 #include <asm/iommu.h>
50 #include <asm/serial.h>
51 #include <asm/cache.h>
52 #include <asm/page.h>
53 #include <asm/mmu.h>
54 #include <asm/lmb.h>
55 #include <asm/xmon.h>
56
57 #include "setup.h"
58
59 #undef DEBUG
60
61 #ifdef DEBUG
62 #define DBG(fmt...) udbg_printf(fmt)
63 #else
64 #define DBG(fmt...)
65 #endif
66
67 #ifdef CONFIG_PPC_MULTIPLATFORM
68 int _machine = 0;
69 EXPORT_SYMBOL(_machine);
70 #endif
71
72 unsigned long klimit = (unsigned long) _end;
73
74 /*
75  * This still seems to be needed... -- paulus
76  */ 
77 struct screen_info screen_info = {
78         .orig_x = 0,
79         .orig_y = 25,
80         .orig_video_cols = 80,
81         .orig_video_lines = 25,
82         .orig_video_isVGA = 1,
83         .orig_video_points = 16
84 };
85
86 #ifdef __DO_IRQ_CANON
87 /* XXX should go elsewhere eventually */
88 int ppc_do_canonicalize_irqs;
89 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
90 #endif
91
92 /* also used by kexec */
93 void machine_shutdown(void)
94 {
95         if (ppc_md.nvram_sync)
96                 ppc_md.nvram_sync();
97 }
98
99 void machine_restart(char *cmd)
100 {
101         machine_shutdown();
102         ppc_md.restart(cmd);
103 #ifdef CONFIG_SMP
104         smp_send_stop();
105 #endif
106         printk(KERN_EMERG "System Halted, OK to turn off power\n");
107         local_irq_disable();
108         while (1) ;
109 }
110
111 void machine_power_off(void)
112 {
113         machine_shutdown();
114         ppc_md.power_off();
115 #ifdef CONFIG_SMP
116         smp_send_stop();
117 #endif
118         printk(KERN_EMERG "System Halted, OK to turn off power\n");
119         local_irq_disable();
120         while (1) ;
121 }
122 /* Used by the G5 thermal driver */
123 EXPORT_SYMBOL_GPL(machine_power_off);
124
125 void (*pm_power_off)(void) = machine_power_off;
126 EXPORT_SYMBOL_GPL(pm_power_off);
127
128 void machine_halt(void)
129 {
130         machine_shutdown();
131         ppc_md.halt();
132 #ifdef CONFIG_SMP
133         smp_send_stop();
134 #endif
135         printk(KERN_EMERG "System Halted, OK to turn off power\n");
136         local_irq_disable();
137         while (1) ;
138 }
139
140
141 #ifdef CONFIG_TAU
142 extern u32 cpu_temp(unsigned long cpu);
143 extern u32 cpu_temp_both(unsigned long cpu);
144 #endif /* CONFIG_TAU */
145
146 #ifdef CONFIG_SMP
147 DEFINE_PER_CPU(unsigned int, pvr);
148 #endif
149
150 static int show_cpuinfo(struct seq_file *m, void *v)
151 {
152         unsigned long cpu_id = (unsigned long)v - 1;
153         unsigned int pvr;
154         unsigned short maj;
155         unsigned short min;
156
157         if (cpu_id == NR_CPUS) {
158 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
159                 unsigned long bogosum = 0;
160                 int i;
161                 for (i = 0; i < NR_CPUS; ++i)
162                         if (cpu_online(i))
163                                 bogosum += loops_per_jiffy;
164                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
165                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
166 #endif /* CONFIG_SMP && CONFIG_PPC32 */
167                 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
168
169                 if (ppc_md.show_cpuinfo != NULL)
170                         ppc_md.show_cpuinfo(m);
171
172                 return 0;
173         }
174
175         /* We only show online cpus: disable preempt (overzealous, I
176          * knew) to prevent cpu going down. */
177         preempt_disable();
178         if (!cpu_online(cpu_id)) {
179                 preempt_enable();
180                 return 0;
181         }
182
183 #ifdef CONFIG_SMP
184         pvr = per_cpu(pvr, cpu_id);
185 #else
186         pvr = mfspr(SPRN_PVR);
187 #endif
188         maj = (pvr >> 8) & 0xFF;
189         min = pvr & 0xFF;
190
191         seq_printf(m, "processor\t: %lu\n", cpu_id);
192         seq_printf(m, "cpu\t\t: ");
193
194         if (cur_cpu_spec->pvr_mask)
195                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
196         else
197                 seq_printf(m, "unknown (%08x)", pvr);
198
199 #ifdef CONFIG_ALTIVEC
200         if (cpu_has_feature(CPU_FTR_ALTIVEC))
201                 seq_printf(m, ", altivec supported");
202 #endif /* CONFIG_ALTIVEC */
203
204         seq_printf(m, "\n");
205
206 #ifdef CONFIG_TAU
207         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
208 #ifdef CONFIG_TAU_AVERAGE
209                 /* more straightforward, but potentially misleading */
210                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
211                            cpu_temp(cpu_id));
212 #else
213                 /* show the actual temp sensor range */
214                 u32 temp;
215                 temp = cpu_temp_both(cpu_id);
216                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
217                            temp & 0xff, temp >> 16);
218 #endif
219         }
220 #endif /* CONFIG_TAU */
221
222         /*
223          * Assume here that all clock rates are the same in a
224          * smp system.  -- Cort
225          */
226         if (ppc_proc_freq)
227                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
228                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
229
230         if (ppc_md.show_percpuinfo != NULL)
231                 ppc_md.show_percpuinfo(m, cpu_id);
232
233         /* If we are a Freescale core do a simple check so
234          * we dont have to keep adding cases in the future */
235         if (PVR_VER(pvr) & 0x8000) {
236                 maj = PVR_MAJ(pvr);
237                 min = PVR_MIN(pvr);
238         } else {
239                 switch (PVR_VER(pvr)) {
240                         case 0x0020:    /* 403 family */
241                                 maj = PVR_MAJ(pvr) + 1;
242                                 min = PVR_MIN(pvr);
243                                 break;
244                         case 0x1008:    /* 740P/750P ?? */
245                                 maj = ((pvr >> 8) & 0xFF) - 1;
246                                 min = pvr & 0xFF;
247                                 break;
248                         default:
249                                 maj = (pvr >> 8) & 0xFF;
250                                 min = pvr & 0xFF;
251                                 break;
252                 }
253         }
254
255         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
256                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
257
258 #ifdef CONFIG_PPC32
259         seq_printf(m, "bogomips\t: %lu.%02lu\n",
260                    loops_per_jiffy / (500000/HZ),
261                    (loops_per_jiffy / (5000/HZ)) % 100);
262 #endif
263
264 #ifdef CONFIG_SMP
265         seq_printf(m, "\n");
266 #endif
267
268         preempt_enable();
269         return 0;
270 }
271
272 static void *c_start(struct seq_file *m, loff_t *pos)
273 {
274         unsigned long i = *pos;
275
276         return i <= NR_CPUS ? (void *)(i + 1) : NULL;
277 }
278
279 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
280 {
281         ++*pos;
282         return c_start(m, pos);
283 }
284
285 static void c_stop(struct seq_file *m, void *v)
286 {
287 }
288
289 struct seq_operations cpuinfo_op = {
290         .start =c_start,
291         .next = c_next,
292         .stop = c_stop,
293         .show = show_cpuinfo,
294 };
295
296 #ifdef CONFIG_PPC_MULTIPLATFORM
297 static int __init set_preferred_console(void)
298 {
299         struct device_node *prom_stdout = NULL;
300         char *name;
301         u32 *spd;
302         int offset = 0;
303
304         DBG(" -> set_preferred_console()\n");
305
306         /* The user has requested a console so this is already set up. */
307         if (strstr(saved_command_line, "console=")) {
308                 DBG(" console was specified !\n");
309                 return -EBUSY;
310         }
311
312         if (!of_chosen) {
313                 DBG(" of_chosen is NULL !\n");
314                 return -ENODEV;
315         }
316         /* We are getting a weird phandle from OF ... */
317         /* ... So use the full path instead */
318         name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
319         if (name == NULL) {
320                 DBG(" no linux,stdout-path !\n");
321                 return -ENODEV;
322         }
323         prom_stdout = of_find_node_by_path(name);
324         if (!prom_stdout) {
325                 DBG(" can't find stdout package %s !\n", name);
326                 return -ENODEV;
327         }       
328         DBG("stdout is %s\n", prom_stdout->full_name);
329
330         name = (char *)get_property(prom_stdout, "name", NULL);
331         if (!name) {
332                 DBG(" stdout package has no name !\n");
333                 goto not_found;
334         }
335         spd = (u32 *)get_property(prom_stdout, "current-speed", NULL);
336
337         if (0)
338                 ;
339 #ifdef CONFIG_SERIAL_8250_CONSOLE
340         else if (strcmp(name, "serial") == 0) {
341                 int i;
342                 u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
343                 if (i > 8) {
344                         switch (reg[1]) {
345                                 case 0x3f8:
346                                         offset = 0;
347                                         break;
348                                 case 0x2f8:
349                                         offset = 1;
350                                         break;
351                                 case 0x898:
352                                         offset = 2;
353                                         break;
354                                 case 0x890:
355                                         offset = 3;
356                                         break;
357                                 default:
358                                         /* We dont recognise the serial port */
359                                         goto not_found;
360                         }
361                 }
362         }
363 #endif /* CONFIG_SERIAL_8250_CONSOLE */
364 #ifdef CONFIG_PPC_PSERIES
365         else if (strcmp(name, "vty") == 0) {
366                 u32 *reg = (u32 *)get_property(prom_stdout, "reg", NULL);
367                 char *compat = (char *)get_property(prom_stdout, "compatible", NULL);
368
369                 if (reg && compat && (strcmp(compat, "hvterm-protocol") == 0)) {
370                         /* Host Virtual Serial Interface */
371                         switch (reg[0]) {
372                                 case 0x30000000:
373                                         offset = 0;
374                                         break;
375                                 case 0x30000001:
376                                         offset = 1;
377                                         break;
378                                 default:
379                                         goto not_found;
380                         }
381                         of_node_put(prom_stdout);
382                         DBG("Found hvsi console at offset %d\n", offset);
383                         return add_preferred_console("hvsi", offset, NULL);
384                 } else {
385                         /* pSeries LPAR virtual console */
386                         of_node_put(prom_stdout);
387                         DBG("Found hvc console\n");
388                         return add_preferred_console("hvc", 0, NULL);
389                 }
390         }
391 #endif /* CONFIG_PPC_PSERIES */
392 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
393         else if (strcmp(name, "ch-a") == 0)
394                 offset = 0;
395         else if (strcmp(name, "ch-b") == 0)
396                 offset = 1;
397 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
398         else
399                 goto not_found;
400         of_node_put(prom_stdout);
401
402         DBG("Found serial console at ttyS%d\n", offset);
403
404         if (spd) {
405                 static char __initdata opt[16];
406                 sprintf(opt, "%d", *spd);
407                 return add_preferred_console("ttyS", offset, opt);
408         } else
409                 return add_preferred_console("ttyS", offset, NULL);
410
411  not_found:
412         DBG("No preferred console found !\n");
413         of_node_put(prom_stdout);
414         return -ENODEV;
415 }
416 console_initcall(set_preferred_console);
417 #endif /* CONFIG_PPC_MULTIPLATFORM */
418
419 void __init check_for_initrd(void)
420 {
421 #ifdef CONFIG_BLK_DEV_INITRD
422         unsigned long *prop;
423
424         DBG(" -> check_for_initrd()\n");
425
426         if (of_chosen) {
427                 prop = (unsigned long *)get_property(of_chosen,
428                                 "linux,initrd-start", NULL);
429                 if (prop != NULL) {
430                         initrd_start = (unsigned long)__va(*prop);
431                         prop = (unsigned long *)get_property(of_chosen,
432                                         "linux,initrd-end", NULL);
433                         if (prop != NULL) {
434                                 initrd_end = (unsigned long)__va(*prop);
435                                 initrd_below_start_ok = 1;
436                         } else
437                                 initrd_start = 0;
438                 }
439         }
440
441         /* If we were passed an initrd, set the ROOT_DEV properly if the values
442          * look sensible. If not, clear initrd reference.
443          */
444         if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
445             initrd_end > initrd_start)
446                 ROOT_DEV = Root_RAM0;
447         else {
448                 printk("Bogus initrd %08lx %08lx\n", initrd_start, initrd_end);
449                 initrd_start = initrd_end = 0;
450         }
451
452         if (initrd_start)
453                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
454
455         DBG(" <- check_for_initrd()\n");
456 #endif /* CONFIG_BLK_DEV_INITRD */
457 }
458
459 #ifdef CONFIG_SMP
460
461 /**
462  * setup_cpu_maps - initialize the following cpu maps:
463  *                  cpu_possible_map
464  *                  cpu_present_map
465  *                  cpu_sibling_map
466  *
467  * Having the possible map set up early allows us to restrict allocations
468  * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
469  *
470  * We do not initialize the online map here; cpus set their own bits in
471  * cpu_online_map as they come up.
472  *
473  * This function is valid only for Open Firmware systems.  finish_device_tree
474  * must be called before using this.
475  *
476  * While we're here, we may as well set the "physical" cpu ids in the paca.
477  */
478 void __init smp_setup_cpu_maps(void)
479 {
480         struct device_node *dn = NULL;
481         int cpu = 0;
482         int swap_cpuid = 0;
483
484         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
485                 int *intserv;
486                 int j, len = sizeof(u32), nthreads = 1;
487
488                 intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
489                                               &len);
490                 if (intserv)
491                         nthreads = len / sizeof(int);
492                 else {
493                         intserv = (int *) get_property(dn, "reg", NULL);
494                         if (!intserv)
495                                 intserv = &cpu; /* assume logical == phys */
496                 }
497
498                 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
499                         cpu_set(cpu, cpu_present_map);
500                         set_hard_smp_processor_id(cpu, intserv[j]);
501
502                         if (intserv[j] == boot_cpuid_phys)
503                                 swap_cpuid = cpu;
504                         cpu_set(cpu, cpu_possible_map);
505                         cpu++;
506                 }
507         }
508
509         /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
510          * boot cpu is logical 0.
511          */
512         if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
513                 u32 tmp;
514                 tmp = get_hard_smp_processor_id(0);
515                 set_hard_smp_processor_id(0, boot_cpuid_phys);
516                 set_hard_smp_processor_id(swap_cpuid, tmp);
517         }
518
519 #ifdef CONFIG_PPC64
520         /*
521          * On pSeries LPAR, we need to know how many cpus
522          * could possibly be added to this partition.
523          */
524         if (_machine == PLATFORM_PSERIES_LPAR &&
525             (dn = of_find_node_by_path("/rtas"))) {
526                 int num_addr_cell, num_size_cell, maxcpus;
527                 unsigned int *ireg;
528
529                 num_addr_cell = prom_n_addr_cells(dn);
530                 num_size_cell = prom_n_size_cells(dn);
531
532                 ireg = (unsigned int *)
533                         get_property(dn, "ibm,lrdr-capacity", NULL);
534
535                 if (!ireg)
536                         goto out;
537
538                 maxcpus = ireg[num_addr_cell + num_size_cell];
539
540                 /* Double maxcpus for processors which have SMT capability */
541                 if (cpu_has_feature(CPU_FTR_SMT))
542                         maxcpus *= 2;
543
544                 if (maxcpus > NR_CPUS) {
545                         printk(KERN_WARNING
546                                "Partition configured for %d cpus, "
547                                "operating system maximum is %d.\n",
548                                maxcpus, NR_CPUS);
549                         maxcpus = NR_CPUS;
550                 } else
551                         printk(KERN_INFO "Partition configured for %d cpus.\n",
552                                maxcpus);
553
554                 for (cpu = 0; cpu < maxcpus; cpu++)
555                         cpu_set(cpu, cpu_possible_map);
556         out:
557                 of_node_put(dn);
558         }
559
560         /*
561          * Do the sibling map; assume only two threads per processor.
562          */
563         for_each_cpu(cpu) {
564                 cpu_set(cpu, cpu_sibling_map[cpu]);
565                 if (cpu_has_feature(CPU_FTR_SMT))
566                         cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
567         }
568
569         _systemcfg->processorCount = num_present_cpus();
570 #endif /* CONFIG_PPC64 */
571 }
572 #endif /* CONFIG_SMP */
573
574 #ifdef CONFIG_XMON
575 static int __init early_xmon(char *p)
576 {
577         /* ensure xmon is enabled */
578         if (p) {
579                 if (strncmp(p, "on", 2) == 0)
580                         xmon_init(1);
581                 if (strncmp(p, "off", 3) == 0)
582                         xmon_init(0);
583                 if (strncmp(p, "early", 5) != 0)
584                         return 0;
585         }
586         xmon_init(1);
587         debugger(NULL);
588
589         return 0;
590 }
591 early_param("xmon", early_xmon);
592 #endif