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