[PATCH] w1_therm: support for ds18b20, ds1822 thermal sensors.
[linux-2.6/verdex.git] / arch / mips / kernel / setup.c
blob6018ca25acebaf038ccc20988624033966252957
1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
6 * Copyright (C) 1995 Linus Torvalds
7 * Copyright (C) 1995 Waldorf Electronics
8 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle
9 * Copyright (C) 1996 Stoned Elipot
10 * Copyright (C) 1999 Silicon Graphics, Inc.
11 * Copyright (C) 2000 2001, 2002 Maciej W. Rozycki
13 #include <linux/config.h>
14 #include <linux/errno.h>
15 #include <linux/init.h>
16 #include <linux/ioport.h>
17 #include <linux/sched.h>
18 #include <linux/kernel.h>
19 #include <linux/mm.h>
20 #include <linux/module.h>
21 #include <linux/stddef.h>
22 #include <linux/string.h>
23 #include <linux/unistd.h>
24 #include <linux/slab.h>
25 #include <linux/user.h>
26 #include <linux/utsname.h>
27 #include <linux/a.out.h>
28 #include <linux/tty.h>
29 #include <linux/bootmem.h>
30 #include <linux/initrd.h>
31 #include <linux/major.h>
32 #include <linux/kdev_t.h>
33 #include <linux/root_dev.h>
34 #include <linux/highmem.h>
35 #include <linux/console.h>
37 #include <asm/addrspace.h>
38 #include <asm/bootinfo.h>
39 #include <asm/cpu.h>
40 #include <asm/sections.h>
41 #include <asm/setup.h>
42 #include <asm/system.h>
44 struct cpuinfo_mips cpu_data[NR_CPUS];
46 EXPORT_SYMBOL(cpu_data);
48 #ifdef CONFIG_VT
49 struct screen_info screen_info;
50 #endif
53 * Despite it's name this variable is even if we don't have PCI
55 unsigned int PCI_DMA_BUS_IS_PHYS;
57 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
60 * Setup information
62 * These are initialized so they are in the .data section
64 unsigned long mips_machtype = MACH_UNKNOWN;
65 unsigned long mips_machgroup = MACH_GROUP_UNKNOWN;
67 EXPORT_SYMBOL(mips_machtype);
68 EXPORT_SYMBOL(mips_machgroup);
70 struct boot_mem_map boot_mem_map;
72 static char command_line[CL_SIZE];
73 char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE;
76 * mips_io_port_base is the begin of the address space to which x86 style
77 * I/O ports are mapped.
79 const unsigned long mips_io_port_base = -1;
80 EXPORT_SYMBOL(mips_io_port_base);
83 * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
84 * for the processor.
86 unsigned long isa_slot_offset;
87 EXPORT_SYMBOL(isa_slot_offset);
89 static struct resource code_resource = { .name = "Kernel code", };
90 static struct resource data_resource = { .name = "Kernel data", };
92 void __init add_memory_region(phys_t start, phys_t size, long type)
94 int x = boot_mem_map.nr_map;
95 struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
98 * Try to merge with previous entry if any. This is far less than
99 * perfect but is sufficient for most real world cases.
101 if (x && prev->addr + prev->size == start && prev->type == type) {
102 prev->size += size;
103 return;
106 if (x == BOOT_MEM_MAP_MAX) {
107 printk("Ooops! Too many entries in the memory map!\n");
108 return;
111 boot_mem_map.map[x].addr = start;
112 boot_mem_map.map[x].size = size;
113 boot_mem_map.map[x].type = type;
114 boot_mem_map.nr_map++;
117 static void __init print_memory_map(void)
119 int i;
120 const int field = 2 * sizeof(unsigned long);
122 for (i = 0; i < boot_mem_map.nr_map; i++) {
123 printk(" memory: %0*Lx @ %0*Lx ",
124 field, (unsigned long long) boot_mem_map.map[i].size,
125 field, (unsigned long long) boot_mem_map.map[i].addr);
127 switch (boot_mem_map.map[i].type) {
128 case BOOT_MEM_RAM:
129 printk("(usable)\n");
130 break;
131 case BOOT_MEM_ROM_DATA:
132 printk("(ROM data)\n");
133 break;
134 case BOOT_MEM_RESERVED:
135 printk("(reserved)\n");
136 break;
137 default:
138 printk("type %lu\n", boot_mem_map.map[i].type);
139 break;
144 static inline void parse_cmdline_early(void)
146 char c = ' ', *to = command_line, *from = saved_command_line;
147 unsigned long start_at, mem_size;
148 int len = 0;
149 int usermem = 0;
151 printk("Determined physical RAM map:\n");
152 print_memory_map();
154 for (;;) {
156 * "mem=XXX[kKmM]" defines a memory region from
157 * 0 to <XXX>, overriding the determined size.
158 * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
159 * <YYY> to <YYY>+<XXX>, overriding the determined size.
161 if (c == ' ' && !memcmp(from, "mem=", 4)) {
162 if (to != command_line)
163 to--;
165 * If a user specifies memory size, we
166 * blow away any automatically generated
167 * size.
169 if (usermem == 0) {
170 boot_mem_map.nr_map = 0;
171 usermem = 1;
173 mem_size = memparse(from + 4, &from);
174 if (*from == '@')
175 start_at = memparse(from + 1, &from);
176 else
177 start_at = 0;
178 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
180 c = *(from++);
181 if (!c)
182 break;
183 if (CL_SIZE <= ++len)
184 break;
185 *(to++) = c;
187 *to = '\0';
189 if (usermem) {
190 printk("User-defined physical RAM map:\n");
191 print_memory_map();
195 static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end)
198 * "rd_start=0xNNNNNNNN" defines the memory address of an initrd
199 * "rd_size=0xNN" it's size
201 unsigned long start = 0;
202 unsigned long size = 0;
203 unsigned long end;
204 char cmd_line[CL_SIZE];
205 char *start_str;
206 char *size_str;
207 char *tmp;
209 strcpy(cmd_line, command_line);
210 *command_line = 0;
211 tmp = cmd_line;
212 /* Ignore "rd_start=" strings in other parameters. */
213 start_str = strstr(cmd_line, "rd_start=");
214 if (start_str && start_str != cmd_line && *(start_str - 1) != ' ')
215 start_str = strstr(start_str, " rd_start=");
216 while (start_str) {
217 if (start_str != cmd_line)
218 strncat(command_line, tmp, start_str - tmp);
219 start = memparse(start_str + 9, &start_str);
220 tmp = start_str + 1;
221 start_str = strstr(start_str, " rd_start=");
223 if (*tmp)
224 strcat(command_line, tmp);
226 strcpy(cmd_line, command_line);
227 *command_line = 0;
228 tmp = cmd_line;
229 /* Ignore "rd_size" strings in other parameters. */
230 size_str = strstr(cmd_line, "rd_size=");
231 if (size_str && size_str != cmd_line && *(size_str - 1) != ' ')
232 size_str = strstr(size_str, " rd_size=");
233 while (size_str) {
234 if (size_str != cmd_line)
235 strncat(command_line, tmp, size_str - tmp);
236 size = memparse(size_str + 8, &size_str);
237 tmp = size_str + 1;
238 size_str = strstr(size_str, " rd_size=");
240 if (*tmp)
241 strcat(command_line, tmp);
243 #ifdef CONFIG_MIPS64
244 /* HACK: Guess if the sign extension was forgotten */
245 if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
246 start |= 0xffffffff00000000;
247 #endif
249 end = start + size;
250 if (start && end) {
251 *rd_start = start;
252 *rd_end = end;
253 return 1;
255 return 0;
258 #define PFN_UP(x) (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
259 #define PFN_DOWN(x) ((x) >> PAGE_SHIFT)
260 #define PFN_PHYS(x) ((x) << PAGE_SHIFT)
262 #define MAXMEM HIGHMEM_START
263 #define MAXMEM_PFN PFN_DOWN(MAXMEM)
265 static inline void bootmem_init(void)
267 unsigned long start_pfn;
268 unsigned long reserved_end = (unsigned long)&_end;
269 #ifndef CONFIG_SGI_IP27
270 unsigned long first_usable_pfn;
271 unsigned long bootmap_size;
272 int i;
273 #endif
274 #ifdef CONFIG_BLK_DEV_INITRD
275 int initrd_reserve_bootmem = 0;
277 /* Board specific code should have set up initrd_start and initrd_end */
278 ROOT_DEV = Root_RAM0;
279 if (parse_rd_cmdline(&initrd_start, &initrd_end)) {
280 reserved_end = max(reserved_end, initrd_end);
281 initrd_reserve_bootmem = 1;
282 } else {
283 unsigned long tmp;
284 u32 *initrd_header;
286 tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2;
287 if (tmp < reserved_end)
288 tmp += PAGE_SIZE;
289 initrd_header = (u32 *)tmp;
290 if (initrd_header[0] == 0x494E5244) {
291 initrd_start = (unsigned long)&initrd_header[2];
292 initrd_end = initrd_start + initrd_header[1];
293 reserved_end = max(reserved_end, initrd_end);
294 initrd_reserve_bootmem = 1;
297 #endif /* CONFIG_BLK_DEV_INITRD */
300 * Partially used pages are not usable - thus
301 * we are rounding upwards.
303 start_pfn = PFN_UP(CPHYSADDR(reserved_end));
305 #ifndef CONFIG_SGI_IP27
306 /* Find the highest page frame number we have available. */
307 max_pfn = 0;
308 first_usable_pfn = -1UL;
309 for (i = 0; i < boot_mem_map.nr_map; i++) {
310 unsigned long start, end;
312 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
313 continue;
315 start = PFN_UP(boot_mem_map.map[i].addr);
316 end = PFN_DOWN(boot_mem_map.map[i].addr
317 + boot_mem_map.map[i].size);
319 if (start >= end)
320 continue;
321 if (end > max_pfn)
322 max_pfn = end;
323 if (start < first_usable_pfn) {
324 if (start > start_pfn) {
325 first_usable_pfn = start;
326 } else if (end > start_pfn) {
327 first_usable_pfn = start_pfn;
333 * Determine low and high memory ranges
335 max_low_pfn = max_pfn;
336 if (max_low_pfn > MAXMEM_PFN) {
337 max_low_pfn = MAXMEM_PFN;
338 #ifndef CONFIG_HIGHMEM
339 /* Maximum memory usable is what is directly addressable */
340 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
341 MAXMEM >> 20);
342 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
343 #endif
346 #ifdef CONFIG_HIGHMEM
348 * Crude, we really should make a better attempt at detecting
349 * highstart_pfn
351 highstart_pfn = highend_pfn = max_pfn;
352 if (max_pfn > MAXMEM_PFN) {
353 highstart_pfn = MAXMEM_PFN;
354 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
355 (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT));
357 #endif
359 /* Initialize the boot-time allocator with low memory only. */
360 bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn);
363 * Register fully available low RAM pages with the bootmem allocator.
365 for (i = 0; i < boot_mem_map.nr_map; i++) {
366 unsigned long curr_pfn, last_pfn, size;
369 * Reserve usable memory.
371 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
372 continue;
375 * We are rounding up the start address of usable memory:
377 curr_pfn = PFN_UP(boot_mem_map.map[i].addr);
378 if (curr_pfn >= max_low_pfn)
379 continue;
380 if (curr_pfn < start_pfn)
381 curr_pfn = start_pfn;
384 * ... and at the end of the usable range downwards:
386 last_pfn = PFN_DOWN(boot_mem_map.map[i].addr
387 + boot_mem_map.map[i].size);
389 if (last_pfn > max_low_pfn)
390 last_pfn = max_low_pfn;
393 * Only register lowmem part of lowmem segment with bootmem.
395 size = last_pfn - curr_pfn;
396 if (curr_pfn > PFN_DOWN(HIGHMEM_START))
397 continue;
398 if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START))
399 size = PFN_DOWN(HIGHMEM_START) - curr_pfn;
400 if (!size)
401 continue;
404 * ... finally, did all the rounding and playing
405 * around just make the area go away?
407 if (last_pfn <= curr_pfn)
408 continue;
410 /* Register lowmem ranges */
411 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
414 /* Reserve the bootmap memory. */
415 reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size);
416 #endif /* CONFIG_SGI_IP27 */
418 #ifdef CONFIG_BLK_DEV_INITRD
419 initrd_below_start_ok = 1;
420 if (initrd_start) {
421 unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start);
422 printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
423 (void *)initrd_start, initrd_size);
425 if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
426 printk("initrd extends beyond end of memory "
427 "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n",
428 sizeof(long) * 2,
429 (unsigned long long)CPHYSADDR(initrd_end),
430 sizeof(long) * 2,
431 (unsigned long long)PFN_PHYS(max_low_pfn));
432 initrd_start = initrd_end = 0;
433 initrd_reserve_bootmem = 0;
436 if (initrd_reserve_bootmem)
437 reserve_bootmem(CPHYSADDR(initrd_start), initrd_size);
439 #endif /* CONFIG_BLK_DEV_INITRD */
442 static inline void resource_init(void)
444 int i;
446 #if defined(CONFIG_MIPS64) && !defined(CONFIG_BUILD_ELF64)
448 * The 64bit code in 32bit object format trick can't represent
449 * 64bit wide relocations for linker script symbols.
451 code_resource.start = CPHYSADDR(&_text);
452 code_resource.end = CPHYSADDR(&_etext) - 1;
453 data_resource.start = CPHYSADDR(&_etext);
454 data_resource.end = CPHYSADDR(&_edata) - 1;
455 #else
456 code_resource.start = virt_to_phys(&_text);
457 code_resource.end = virt_to_phys(&_etext) - 1;
458 data_resource.start = virt_to_phys(&_etext);
459 data_resource.end = virt_to_phys(&_edata) - 1;
460 #endif
463 * Request address space for all standard RAM.
465 for (i = 0; i < boot_mem_map.nr_map; i++) {
466 struct resource *res;
467 unsigned long start, end;
469 start = boot_mem_map.map[i].addr;
470 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
471 if (start >= MAXMEM)
472 continue;
473 if (end >= MAXMEM)
474 end = MAXMEM - 1;
476 res = alloc_bootmem(sizeof(struct resource));
477 switch (boot_mem_map.map[i].type) {
478 case BOOT_MEM_RAM:
479 case BOOT_MEM_ROM_DATA:
480 res->name = "System RAM";
481 break;
482 case BOOT_MEM_RESERVED:
483 default:
484 res->name = "reserved";
487 res->start = start;
488 res->end = end;
490 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
491 request_resource(&iomem_resource, res);
494 * We don't know which RAM region contains kernel data,
495 * so we try it repeatedly and let the resource manager
496 * test it.
498 request_resource(res, &code_resource);
499 request_resource(res, &data_resource);
503 #undef PFN_UP
504 #undef PFN_DOWN
505 #undef PFN_PHYS
507 #undef MAXMEM
508 #undef MAXMEM_PFN
510 static int __initdata earlyinit_debug;
512 static int __init earlyinit_debug_setup(char *str)
514 earlyinit_debug = 1;
515 return 1;
517 __setup("earlyinit_debug", earlyinit_debug_setup);
519 extern initcall_t __earlyinitcall_start, __earlyinitcall_end;
521 static void __init do_earlyinitcalls(void)
523 initcall_t *call, *start, *end;
525 start = &__earlyinitcall_start;
526 end = &__earlyinitcall_end;
528 for (call = start; call < end; call++) {
529 if (earlyinit_debug)
530 printk("calling earlyinitcall 0x%p\n", *call);
532 (*call)();
536 void __init setup_arch(char **cmdline_p)
538 cpu_probe();
539 prom_init();
540 cpu_report();
542 #if defined(CONFIG_VT)
543 #if defined(CONFIG_VGA_CONSOLE)
544 conswitchp = &vga_con;
545 #elif defined(CONFIG_DUMMY_CONSOLE)
546 conswitchp = &dummy_con;
547 #endif
548 #endif
550 /* call board setup routine */
551 do_earlyinitcalls();
553 strlcpy(command_line, arcs_cmdline, sizeof(command_line));
554 strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
556 *cmdline_p = command_line;
558 parse_cmdline_early();
559 bootmem_init();
560 paging_init();
561 resource_init();
564 int __init fpu_disable(char *s)
566 cpu_data[0].options &= ~MIPS_CPU_FPU;
568 return 1;
571 __setup("nofpu", fpu_disable);