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