v2.4.8 -> v2.4.8.1
[opensuse:kernel.git] / arch / arm / kernel / setup.c
1 /*
2  *  linux/arch/arm/kernel/setup.c
3  *
4  *  Copyright (C) 1995-2000 Russell King
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10 #include <linux/config.h>
11 #include <linux/kernel.h>
12 #include <linux/stddef.h>
13 #include <linux/ioport.h>
14 #include <linux/delay.h>
15 #include <linux/utsname.h>
16 #include <linux/blk.h>
17 #include <linux/console.h>
18 #include <linux/bootmem.h>
19 #include <linux/init.h>
20
21 #include <asm/elf.h>
22 #include <asm/hardware.h>
23 #include <asm/io.h>
24 #include <asm/procinfo.h>
25 #include <asm/setup.h>
26 #include <asm/mach-types.h>
27
28 #include <asm/mach/arch.h>
29 #include <asm/mach/irq.h>
30
31 #ifndef MEM_SIZE
32 #define MEM_SIZE        (16*1024*1024)
33 #endif
34
35 #ifndef CONFIG_CMDLINE
36 #define CONFIG_CMDLINE ""
37 #endif
38
39 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
40 char fpe_type[8];
41
42 static int __init fpe_setup(char *line)
43 {
44         memcpy(fpe_type, line, 8);
45         return 1;
46 }
47
48 __setup("fpe=", fpe_setup);
49 #endif
50
51 extern unsigned int mem_fclk_21285;
52 extern void paging_init(struct meminfo *, struct machine_desc *desc);
53 extern void convert_to_tag_list(struct param_struct *params, int mem_init);
54 extern void bootmem_init(struct meminfo *);
55 extern void reboot_setup(char *str);
56 extern int root_mountflags;
57 extern int _stext, _text, _etext, _edata, _end;
58
59 unsigned int processor_id;
60 unsigned int compat;
61 unsigned int __machine_arch_type;
62 unsigned int system_rev;
63 unsigned int system_serial_low;
64 unsigned int system_serial_high;
65 unsigned int elf_hwcap;
66
67 #ifdef MULTI_CPU
68 struct processor processor;
69 #endif
70
71 unsigned char aux_device_present;
72 char elf_platform[ELF_PLATFORM_SIZE];
73 char saved_command_line[COMMAND_LINE_SIZE];
74
75 static struct meminfo meminfo __initdata = { 0, };
76 static struct proc_info_item proc_info;
77 static const char *machine_name;
78 static char command_line[COMMAND_LINE_SIZE];
79
80 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
81 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
82 #define ENDIANNESS ((char)endian_test.l)
83
84 /*
85  * Standard memory resources
86  */
87 static struct resource mem_res[] = {
88         { "Video RAM",   0,     0,     IORESOURCE_MEM                   },
89         { "Kernel code", 0,     0,     IORESOURCE_MEM                   },
90         { "Kernel data", 0,     0,     IORESOURCE_MEM                   }
91 };
92
93 #define video_ram   mem_res[0]
94 #define kernel_code mem_res[1]
95 #define kernel_data mem_res[2]
96
97 static struct resource io_res[] = {
98         { "reserved",    0x3bc, 0x3be, IORESOURCE_IO | IORESOURCE_BUSY },
99         { "reserved",    0x378, 0x37f, IORESOURCE_IO | IORESOURCE_BUSY },
100         { "reserved",    0x278, 0x27f, IORESOURCE_IO | IORESOURCE_BUSY }
101 };
102
103 #define lp0 io_res[0]
104 #define lp1 io_res[1]
105 #define lp2 io_res[2]
106
107 static void __init setup_processor(void)
108 {
109         extern struct proc_info_list __proc_info_begin, __proc_info_end;
110         struct proc_info_list *list;
111
112         /*
113          * locate processor in the list of supported processor
114          * types.  The linker builds this table for us from the
115          * entries in arch/arm/mm/proc-*.S
116          */
117         for (list = &__proc_info_begin; list < &__proc_info_end ; list++)
118                 if ((processor_id & list->cpu_mask) == list->cpu_val)
119                         break;
120
121         /*
122          * If processor type is unrecognised, then we
123          * can do nothing...
124          */
125         if (list >= &__proc_info_end) {
126                 printk("CPU configuration botched (ID %08x), unable "
127                        "to continue.\n", processor_id);
128                 while (1);
129         }
130
131         proc_info = *list->info;
132
133 #ifdef MULTI_CPU
134         processor = *list->proc;
135 #endif
136
137         printk("Processor: %s %s revision %d\n",
138                proc_info.manufacturer, proc_info.cpu_name,
139                (int)processor_id & 15);
140
141         sprintf(system_utsname.machine, "%s%c", list->arch_name, ENDIANNESS);
142         sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
143         elf_hwcap = list->elf_hwcap;
144
145         cpu_proc_init();
146 }
147
148 static struct machine_desc * __init setup_architecture(unsigned int nr)
149 {
150         extern struct machine_desc __arch_info_begin, __arch_info_end;
151         struct machine_desc *list;
152
153         /*
154          * locate architecture in the list of supported architectures.
155          */
156         for (list = &__arch_info_begin; list < &__arch_info_end; list++)
157                 if (list->nr == nr)
158                         break;
159
160         /*
161          * If the architecture type is not recognised, then we
162          * can co nothing...
163          */
164         if (list >= &__arch_info_end) {
165                 printk("Architecture configuration botched (nr %d), unable "
166                        "to continue.\n", nr);
167                 while (1);
168         }
169
170         printk("Architecture: %s\n", list->name);
171         if (compat)
172                 printk(KERN_WARNING "Using compatibility code "
173                         "scheduled for removal in v%d.%d.%d\n",
174                         compat >> 24, (compat >> 12) & 0x3ff,
175                         compat & 0x3ff);
176
177         return list;
178 }
179
180 /*
181  * Initial parsing of the command line.  We need to pick out the
182  * memory size.  We look for mem=size@start, where start and size
183  * are "size[KkMm]"
184  */
185 static void __init
186 parse_cmdline(struct meminfo *mi, char **cmdline_p, char *from)
187 {
188         char c = ' ', *to = command_line;
189         int usermem = 0, len = 0;
190
191         for (;;) {
192                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
193                         unsigned long size, start;
194
195                         if (to != command_line)
196                                 to -= 1;
197
198                         /*
199                          * If the user specifies memory size, we
200                          * blow away any automatically generated
201                          * size.
202                          */
203                         if (usermem == 0) {
204                                 usermem = 1;
205                                 mi->nr_banks = 0;
206                         }
207
208                         start = PHYS_OFFSET;
209                         size  = memparse(from + 4, &from);
210                         if (*from == '@')
211                                 start = memparse(from + 1, &from);
212
213                         mi->bank[mi->nr_banks].start = start;
214                         mi->bank[mi->nr_banks].size  = size;
215                         mi->bank[mi->nr_banks].node  = PHYS_TO_NID(start);
216                         mi->nr_banks += 1;
217                 }
218                 c = *from++;
219                 if (!c)
220                         break;
221                 if (COMMAND_LINE_SIZE <= ++len)
222                         break;
223                 *to++ = c;
224         }
225         *to = '\0';
226         *cmdline_p = command_line;
227 }
228
229 void __init
230 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
231 {
232 #ifdef CONFIG_BLK_DEV_RAM
233         extern int rd_size;
234
235         rd_image_start = image_start;
236         rd_prompt = prompt;
237         rd_doload = doload;
238
239         if (rd_sz)
240                 rd_size = rd_sz;
241 #endif
242 }
243
244 /*
245  * initial ram disk
246  */
247 void __init setup_initrd(unsigned int start, unsigned int size)
248 {
249 #ifdef CONFIG_BLK_DEV_INITRD
250         if (start == 0)
251                 size = 0;
252         initrd_start = start;
253         initrd_end   = start + size;
254 #endif
255 }
256
257 static void __init
258 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
259 {
260         struct resource *res;
261         int i;
262
263         kernel_code.start  = __virt_to_bus(init_mm.start_code);
264         kernel_code.end    = __virt_to_bus(init_mm.end_code - 1);
265         kernel_data.start  = __virt_to_bus(init_mm.end_code);
266         kernel_data.end    = __virt_to_bus(init_mm.brk - 1);
267
268         for (i = 0; i < mi->nr_banks; i++) {
269                 unsigned long virt_start, virt_end;
270
271                 if (mi->bank[i].size == 0)
272                         continue;
273
274                 virt_start = __phys_to_virt(mi->bank[i].start);
275                 virt_end   = virt_start + mi->bank[i].size - 1;
276
277                 res = alloc_bootmem_low(sizeof(*res));
278                 res->name  = "System RAM";
279                 res->start = __virt_to_phys(virt_start);
280                 res->end   = __virt_to_phys(virt_end);
281                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
282
283                 request_resource(&iomem_resource, res);
284
285                 if (kernel_code.start >= res->start &&
286                     kernel_code.end <= res->end)
287                         request_resource(res, &kernel_code);
288                 if (kernel_data.start >= res->start &&
289                     kernel_data.end <= res->end)
290                         request_resource(res, &kernel_data);
291         }
292
293         if (mdesc->video_start) {
294                 video_ram.start = mdesc->video_start;
295                 video_ram.end   = mdesc->video_end;
296                 request_resource(&iomem_resource, &video_ram);
297         }
298
299         /*
300          * Some machines don't have the possibility of ever
301          * possessing lp0, lp1 or lp2
302          */
303         if (mdesc->reserve_lp0)
304                 request_resource(&ioport_resource, &lp0);
305         if (mdesc->reserve_lp1)
306                 request_resource(&ioport_resource, &lp1);
307         if (mdesc->reserve_lp2)
308                 request_resource(&ioport_resource, &lp2);
309 }
310
311 /*
312  *  Tag parsing.
313  *
314  * This is the new way of passing data to the kernel at boot time.  Rather
315  * than passing a fixed inflexible structure to the kernel, we pass a list
316  * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
317  * tag for the list to be recognised (to distinguish the tagged list from
318  * a param_struct).  The list is terminated with a zero-length tag (this tag
319  * is not parsed in any way).
320  */
321 static int __init parse_tag_core(const struct tag *tag)
322 {
323         if (tag->hdr.size > 2) {
324                 if ((tag->u.core.flags & 1) == 0)
325                         root_mountflags &= ~MS_RDONLY;
326                 ROOT_DEV = to_kdev_t(tag->u.core.rootdev);
327         }
328         return 0;
329 }
330
331 __tagtable(ATAG_CORE, parse_tag_core);
332
333 static int __init parse_tag_mem32(const struct tag *tag)
334 {
335         if (meminfo.nr_banks >= NR_BANKS) {
336                 printk(KERN_WARNING
337                        "Ignoring memory bank 0x%08x size %dKB\n",
338                         tag->u.mem.start, tag->u.mem.size / 1024);
339                 return -EINVAL;
340         }
341         meminfo.bank[meminfo.nr_banks].start = tag->u.mem.start;
342         meminfo.bank[meminfo.nr_banks].size  = tag->u.mem.size;
343         meminfo.bank[meminfo.nr_banks].node  = PHYS_TO_NID(tag->u.mem.start);
344         meminfo.nr_banks += 1;
345
346         return 0;
347 }
348
349 __tagtable(ATAG_MEM, parse_tag_mem32);
350
351 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
352 struct screen_info screen_info = {
353  orig_video_lines:      30,
354  orig_video_cols:       80,
355  orig_video_mode:       0,
356  orig_video_ega_bx:     0,
357  orig_video_isVGA:      1,
358  orig_video_points:     8
359 };
360
361 static int __init parse_tag_videotext(const struct tag *tag)
362 {
363         screen_info.orig_x            = tag->u.videotext.x;
364         screen_info.orig_y            = tag->u.videotext.y;
365         screen_info.orig_video_page   = tag->u.videotext.video_page;
366         screen_info.orig_video_mode   = tag->u.videotext.video_mode;
367         screen_info.orig_video_cols   = tag->u.videotext.video_cols;
368         screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
369         screen_info.orig_video_lines  = tag->u.videotext.video_lines;
370         screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
371         screen_info.orig_video_points = tag->u.videotext.video_points;
372         return 0;
373 }
374
375 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
376 #endif
377
378 static int __init parse_tag_ramdisk(const struct tag *tag)
379 {
380         setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
381                       (tag->u.ramdisk.flags & 2) == 0,
382                       tag->u.ramdisk.start, tag->u.ramdisk.size);
383         return 0;
384 }
385
386 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
387
388 static int __init parse_tag_initrd(const struct tag *tag)
389 {
390         setup_initrd(tag->u.initrd.start, tag->u.initrd.size);
391         return 0;
392 }
393
394 __tagtable(ATAG_INITRD, parse_tag_initrd);
395
396 static int __init parse_tag_serialnr(const struct tag *tag)
397 {
398         system_serial_low = tag->u.serialnr.low;
399         system_serial_high = tag->u.serialnr.high;
400         return 0;
401 }
402
403 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
404
405 static int __init parse_tag_revision(const struct tag *tag)
406 {
407         system_rev = tag->u.revision.rev;
408         return 0;
409 }
410
411 __tagtable(ATAG_REVISION, parse_tag_revision);
412
413 static int __init parse_tag_cmdline(const struct tag *tag)
414 {
415         strncpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
416         default_command_line[COMMAND_LINE_SIZE - 1] = '\0';
417         return 0;
418 }
419
420 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
421
422 /*
423  * Scan the tag table for this tag, and call its parse function.
424  * The tag table is built by the linker from all the __tagtable
425  * declarations.
426  */
427 static int __init parse_tag(const struct tag *tag)
428 {
429         extern struct tagtable __tagtable_begin, __tagtable_end;
430         struct tagtable *t;
431
432         for (t = &__tagtable_begin; t < &__tagtable_end; t++)
433                 if (tag->hdr.tag == t->tag) {
434                         t->parse(tag);
435                         break;
436                 }
437
438         return t < &__tagtable_end;
439 }
440
441 /*
442  * Parse all tags in the list, checking both the global and architecture
443  * specific tag tables.
444  */
445 static void __init parse_tags(const struct tag *t)
446 {
447         for (; t->hdr.size; t = tag_next(t))
448                 if (!parse_tag(t))
449                         printk(KERN_WARNING
450                                 "Ignoring unrecognised tag 0x%08x\n",
451                                 t->hdr.tag);
452 }
453
454 void __init setup_arch(char **cmdline_p)
455 {
456         struct tag *tags = NULL;
457         struct machine_desc *mdesc;
458         char *from = default_command_line;
459
460         ROOT_DEV = MKDEV(0, 255);
461
462         setup_processor();
463         mdesc = setup_architecture(machine_arch_type);
464         machine_name = mdesc->name;
465
466         if (mdesc->soft_reboot)
467                 reboot_setup("s");
468
469         if (mdesc->param_offset)
470                 tags = phys_to_virt(mdesc->param_offset);
471
472         /*
473          * Do the machine-specific fixups before we parse the
474          * parameters or tags.
475          */
476         if (mdesc->fixup)
477                 mdesc->fixup(mdesc, (struct param_struct *)tags,
478                              &from, &meminfo);
479
480         /*
481          * If we have the old style parameters, convert them to
482          * a tag list before.
483          */
484         if (tags && tags->hdr.tag != ATAG_CORE)
485                 convert_to_tag_list((struct param_struct *)tags,
486                                     meminfo.nr_banks == 0);
487
488         if (tags && tags->hdr.tag == ATAG_CORE)
489                 parse_tags(tags);
490
491         if (meminfo.nr_banks == 0) {
492                 meminfo.nr_banks      = 1;
493                 meminfo.bank[0].start = PHYS_OFFSET;
494                 meminfo.bank[0].size  = MEM_SIZE;
495         }
496
497         init_mm.start_code = (unsigned long) &_text;
498         init_mm.end_code   = (unsigned long) &_etext;
499         init_mm.end_data   = (unsigned long) &_edata;
500         init_mm.brk        = (unsigned long) &_end;
501
502         memcpy(saved_command_line, from, COMMAND_LINE_SIZE);
503         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
504         parse_cmdline(&meminfo, cmdline_p, from);
505         bootmem_init(&meminfo);
506         paging_init(&meminfo, mdesc);
507         request_standard_resources(&meminfo, mdesc);
508
509         /*
510          * Set up various architecture-specific pointers
511          */
512         init_arch_irq = mdesc->init_irq;
513
514 #ifdef CONFIG_VT
515 #if defined(CONFIG_VGA_CONSOLE)
516         conswitchp = &vga_con;
517 #elif defined(CONFIG_DUMMY_CONSOLE)
518         conswitchp = &dummy_con;
519 #endif
520 #endif
521 }
522
523 int get_cpuinfo(char * buffer)
524 {
525         char *p = buffer;
526
527         p += sprintf(p, "Processor\t: %s %s rev %d (%s)\n",
528                      proc_info.manufacturer, proc_info.cpu_name,
529                      (int)processor_id & 15, elf_platform);
530
531         p += sprintf(p, "BogoMIPS\t: %lu.%02lu\n",
532                      loops_per_jiffy / (500000/HZ),
533                      (loops_per_jiffy / (5000/HZ)) % 100);
534
535         p += sprintf(p, "Hardware\t: %s\n", machine_name);
536
537         p += sprintf(p, "Revision\t: %04x\n",
538                      system_rev);
539
540         p += sprintf(p, "Serial\t\t: %08x%08x\n",
541                      system_serial_high,
542                      system_serial_low);
543
544         return p - buffer;
545 }