be12041c0fc5404ab8b811050f45de883c225631
[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/vdso_datapage.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 #include <asm/udbg.h>
63 #define DBG(fmt...) udbg_printf(fmt)
64 #else
65 #define DBG(fmt...)
66 #endif
67
68 #ifdef CONFIG_PPC_MULTIPLATFORM
69 int _machine = 0;
70 EXPORT_SYMBOL(_machine);
71 #endif
72
73 unsigned long klimit = (unsigned long) _end;
74
75 /*
76  * This still seems to be needed... -- paulus
77  */ 
78 struct screen_info screen_info = {
79         .orig_x = 0,
80         .orig_y = 25,
81         .orig_video_cols = 80,
82         .orig_video_lines = 25,
83         .orig_video_isVGA = 1,
84         .orig_video_points = 16
85 };
86
87 #ifdef __DO_IRQ_CANON
88 /* XXX should go elsewhere eventually */
89 int ppc_do_canonicalize_irqs;
90 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
91 #endif
92
93 /* also used by kexec */
94 void machine_shutdown(void)
95 {
96         if (ppc_md.machine_shutdown)
97                 ppc_md.machine_shutdown();
98 }
99
100 void machine_restart(char *cmd)
101 {
102         machine_shutdown();
103         if (ppc_md.restart)
104                 ppc_md.restart(cmd);
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
113 void machine_power_off(void)
114 {
115         machine_shutdown();
116         if (ppc_md.power_off)
117                 ppc_md.power_off();
118 #ifdef CONFIG_SMP
119         smp_send_stop();
120 #endif
121         printk(KERN_EMERG "System Halted, OK to turn off power\n");
122         local_irq_disable();
123         while (1) ;
124 }
125 /* Used by the G5 thermal driver */
126 EXPORT_SYMBOL_GPL(machine_power_off);
127
128 void (*pm_power_off)(void) = machine_power_off;
129 EXPORT_SYMBOL_GPL(pm_power_off);
130
131 void machine_halt(void)
132 {
133         machine_shutdown();
134         if (ppc_md.halt)
135                 ppc_md.halt();
136 #ifdef CONFIG_SMP
137         smp_send_stop();
138 #endif
139         printk(KERN_EMERG "System Halted, OK to turn off power\n");
140         local_irq_disable();
141         while (1) ;
142 }
143
144
145 #ifdef CONFIG_TAU
146 extern u32 cpu_temp(unsigned long cpu);
147 extern u32 cpu_temp_both(unsigned long cpu);
148 #endif /* CONFIG_TAU */
149
150 #ifdef CONFIG_SMP
151 DEFINE_PER_CPU(unsigned int, pvr);
152 #endif
153
154 static int show_cpuinfo(struct seq_file *m, void *v)
155 {
156         unsigned long cpu_id = (unsigned long)v - 1;
157         unsigned int pvr;
158         unsigned short maj;
159         unsigned short min;
160
161         if (cpu_id == NR_CPUS) {
162 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
163                 unsigned long bogosum = 0;
164                 int i;
165                 for (i = 0; i < NR_CPUS; ++i)
166                         if (cpu_online(i))
167                                 bogosum += loops_per_jiffy;
168                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
169                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
170 #endif /* CONFIG_SMP && CONFIG_PPC32 */
171                 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
172
173                 if (ppc_md.show_cpuinfo != NULL)
174                         ppc_md.show_cpuinfo(m);
175
176                 return 0;
177         }
178
179         /* We only show online cpus: disable preempt (overzealous, I
180          * knew) to prevent cpu going down. */
181         preempt_disable();
182         if (!cpu_online(cpu_id)) {
183                 preempt_enable();
184                 return 0;
185         }
186
187 #ifdef CONFIG_SMP
188         pvr = per_cpu(pvr, cpu_id);
189 #else
190         pvr = mfspr(SPRN_PVR);
191 #endif
192         maj = (pvr >> 8) & 0xFF;
193         min = pvr & 0xFF;
194
195         seq_printf(m, "processor\t: %lu\n", cpu_id);
196         seq_printf(m, "cpu\t\t: ");
197
198         if (cur_cpu_spec->pvr_mask)
199                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
200         else
201                 seq_printf(m, "unknown (%08x)", pvr);
202
203 #ifdef CONFIG_ALTIVEC
204         if (cpu_has_feature(CPU_FTR_ALTIVEC))
205                 seq_printf(m, ", altivec supported");
206 #endif /* CONFIG_ALTIVEC */
207
208         seq_printf(m, "\n");
209
210 #ifdef CONFIG_TAU
211         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
212 #ifdef CONFIG_TAU_AVERAGE
213                 /* more straightforward, but potentially misleading */
214                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
215                            cpu_temp(cpu_id));
216 #else
217                 /* show the actual temp sensor range */
218                 u32 temp;
219                 temp = cpu_temp_both(cpu_id);
220                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
221                            temp & 0xff, temp >> 16);
222 #endif
223         }
224 #endif /* CONFIG_TAU */
225
226         /*
227          * Assume here that all clock rates are the same in a
228          * smp system.  -- Cort
229          */
230         if (ppc_proc_freq)
231                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
232                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
233
234         if (ppc_md.show_percpuinfo != NULL)
235                 ppc_md.show_percpuinfo(m, cpu_id);
236
237         /* If we are a Freescale core do a simple check so
238          * we dont have to keep adding cases in the future */
239         if (PVR_VER(pvr) & 0x8000) {
240                 maj = PVR_MAJ(pvr);
241                 min = PVR_MIN(pvr);
242         } else {
243                 switch (PVR_VER(pvr)) {
244                         case 0x0020:    /* 403 family */
245                                 maj = PVR_MAJ(pvr) + 1;
246                                 min = PVR_MIN(pvr);
247                                 break;
248                         case 0x1008:    /* 740P/750P ?? */
249                                 maj = ((pvr >> 8) & 0xFF) - 1;
250                                 min = pvr & 0xFF;
251                                 break;
252                         default:
253                                 maj = (pvr >> 8) & 0xFF;
254                                 min = pvr & 0xFF;
255                                 break;
256                 }
257         }
258
259         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
260                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
261
262 #ifdef CONFIG_PPC32
263         seq_printf(m, "bogomips\t: %lu.%02lu\n",
264                    loops_per_jiffy / (500000/HZ),
265                    (loops_per_jiffy / (5000/HZ)) % 100);
266 #endif
267
268 #ifdef CONFIG_SMP
269         seq_printf(m, "\n");
270 #endif
271
272         preempt_enable();
273         return 0;
274 }
275
276 static void *c_start(struct seq_file *m, loff_t *pos)
277 {
278         unsigned long i = *pos;
279
280         return i <= NR_CPUS ? (void *)(i + 1) : NULL;
281 }
282
283 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
284 {
285         ++*pos;
286         return c_start(m, pos);
287 }
288
289 static void c_stop(struct seq_file *m, void *v)
290 {
291 }
292
293 struct seq_operations cpuinfo_op = {
294         .start =c_start,
295         .next = c_next,
296         .stop = c_stop,
297         .show = show_cpuinfo,
298 };
299
300 void __init check_for_initrd(void)
301 {
302 #ifdef CONFIG_BLK_DEV_INITRD
303         unsigned long *prop;
304
305         DBG(" -> check_for_initrd()\n");
306
307         if (of_chosen) {
308                 prop = (unsigned long *)get_property(of_chosen,
309                                 "linux,initrd-start", NULL);
310                 if (prop != NULL) {
311                         initrd_start = (unsigned long)__va(*prop);
312                         prop = (unsigned long *)get_property(of_chosen,
313                                         "linux,initrd-end", NULL);
314                         if (prop != NULL) {
315                                 initrd_end = (unsigned long)__va(*prop);
316                                 initrd_below_start_ok = 1;
317                         } else
318                                 initrd_start = 0;
319                 }
320         }
321
322         /* If we were passed an initrd, set the ROOT_DEV properly if the values
323          * look sensible. If not, clear initrd reference.
324          */
325         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
326             initrd_end > initrd_start)
327                 ROOT_DEV = Root_RAM0;
328         else
329                 initrd_start = initrd_end = 0;
330
331         if (initrd_start)
332                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
333
334         DBG(" <- check_for_initrd()\n");
335 #endif /* CONFIG_BLK_DEV_INITRD */
336 }
337
338 #ifdef CONFIG_SMP
339
340 /**
341  * setup_cpu_maps - initialize the following cpu maps:
342  *                  cpu_possible_map
343  *                  cpu_present_map
344  *                  cpu_sibling_map
345  *
346  * Having the possible map set up early allows us to restrict allocations
347  * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
348  *
349  * We do not initialize the online map here; cpus set their own bits in
350  * cpu_online_map as they come up.
351  *
352  * This function is valid only for Open Firmware systems.  finish_device_tree
353  * must be called before using this.
354  *
355  * While we're here, we may as well set the "physical" cpu ids in the paca.
356  */
357 void __init smp_setup_cpu_maps(void)
358 {
359         struct device_node *dn = NULL;
360         int cpu = 0;
361         int swap_cpuid = 0;
362
363         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
364                 int *intserv;
365                 int j, len = sizeof(u32), nthreads = 1;
366
367                 intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
368                                               &len);
369                 if (intserv)
370                         nthreads = len / sizeof(int);
371                 else {
372                         intserv = (int *) get_property(dn, "reg", NULL);
373                         if (!intserv)
374                                 intserv = &cpu; /* assume logical == phys */
375                 }
376
377                 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
378                         cpu_set(cpu, cpu_present_map);
379                         set_hard_smp_processor_id(cpu, intserv[j]);
380
381                         if (intserv[j] == boot_cpuid_phys)
382                                 swap_cpuid = cpu;
383                         cpu_set(cpu, cpu_possible_map);
384                         cpu++;
385                 }
386         }
387
388         /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
389          * boot cpu is logical 0.
390          */
391         if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
392                 u32 tmp;
393                 tmp = get_hard_smp_processor_id(0);
394                 set_hard_smp_processor_id(0, boot_cpuid_phys);
395                 set_hard_smp_processor_id(swap_cpuid, tmp);
396         }
397
398 #ifdef CONFIG_PPC64
399         /*
400          * On pSeries LPAR, we need to know how many cpus
401          * could possibly be added to this partition.
402          */
403         if (_machine == PLATFORM_PSERIES_LPAR &&
404             (dn = of_find_node_by_path("/rtas"))) {
405                 int num_addr_cell, num_size_cell, maxcpus;
406                 unsigned int *ireg;
407
408                 num_addr_cell = prom_n_addr_cells(dn);
409                 num_size_cell = prom_n_size_cells(dn);
410
411                 ireg = (unsigned int *)
412                         get_property(dn, "ibm,lrdr-capacity", NULL);
413
414                 if (!ireg)
415                         goto out;
416
417                 maxcpus = ireg[num_addr_cell + num_size_cell];
418
419                 /* Double maxcpus for processors which have SMT capability */
420                 if (cpu_has_feature(CPU_FTR_SMT))
421                         maxcpus *= 2;
422
423                 if (maxcpus > NR_CPUS) {
424                         printk(KERN_WARNING
425                                "Partition configured for %d cpus, "
426                                "operating system maximum is %d.\n",
427                                maxcpus, NR_CPUS);
428                         maxcpus = NR_CPUS;
429                 } else
430                         printk(KERN_INFO "Partition configured for %d cpus.\n",
431                                maxcpus);
432
433                 for (cpu = 0; cpu < maxcpus; cpu++)
434                         cpu_set(cpu, cpu_possible_map);
435         out:
436                 of_node_put(dn);
437         }
438
439         /*
440          * Do the sibling map; assume only two threads per processor.
441          */
442         for_each_cpu(cpu) {
443                 cpu_set(cpu, cpu_sibling_map[cpu]);
444                 if (cpu_has_feature(CPU_FTR_SMT))
445                         cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
446         }
447
448         vdso_data->processorCount = num_present_cpus();
449 #endif /* CONFIG_PPC64 */
450 }
451 #endif /* CONFIG_SMP */
452
453 #ifdef CONFIG_XMON
454 static int __init early_xmon(char *p)
455 {
456         /* ensure xmon is enabled */
457         if (p) {
458                 if (strncmp(p, "on", 2) == 0)
459                         xmon_init(1);
460                 if (strncmp(p, "off", 3) == 0)
461                         xmon_init(0);
462                 if (strncmp(p, "early", 5) != 0)
463                         return 0;
464         }
465         xmon_init(1);
466         debugger(NULL);
467
468         return 0;
469 }
470 early_param("xmon", early_xmon);
471 #endif