?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Blackfin: detect anomaly 05000274
[linux-2.6/btrfs-unstable.git] / arch / blackfin / kernel / setup.c
blobdc30e0aa54cd2497a3d7470e09739870a78d5076
1 /*
2 * arch/blackfin/kernel/setup.c
3 *
4 * Copyright 2004-2006 Analog Devices Inc.
5 *
6 * Enter bugs at http://blackfin.uclinux.org/
7 *
8 * Licensed under the GPL-2 or later.
9 */
10
11 #include <linux/delay.h>
12 #include <linux/console.h>
13 #include <linux/bootmem.h>
14 #include <linux/seq_file.h>
15 #include <linux/cpu.h>
16 #include <linux/mm.h>
17 #include <linux/module.h>
18 #include <linux/tty.h>
19 #include <linux/pfn.h>
20
21 #include <linux/ext2_fs.h>
22 #include <linux/cramfs_fs.h>
23 #include <linux/romfs_fs.h>
24
25 #include <asm/cplb.h>
26 #include <asm/cacheflush.h>
27 #include <asm/blackfin.h>
28 #include <asm/cplbinit.h>
29 #include <asm/div64.h>
30 #include <asm/cpu.h>
31 #include <asm/fixed_code.h>
32 #include <asm/early_printk.h>
33
34 u16 _bfin_swrst;
35 EXPORT_SYMBOL(_bfin_swrst);
36
37 unsigned long memory_start, memory_end, physical_mem_end;
38 unsigned long _rambase, _ramstart, _ramend;
39 unsigned long reserved_mem_dcache_on;
40 unsigned long reserved_mem_icache_on;
41 EXPORT_SYMBOL(memory_start);
42 EXPORT_SYMBOL(memory_end);
43 EXPORT_SYMBOL(physical_mem_end);
44 EXPORT_SYMBOL(_ramend);
45 EXPORT_SYMBOL(reserved_mem_dcache_on);
46
47 #ifdef CONFIG_MTD_UCLINUX
48 unsigned long memory_mtd_end, memory_mtd_start, mtd_size;
49 unsigned long _ebss;
50 EXPORT_SYMBOL(memory_mtd_end);
51 EXPORT_SYMBOL(memory_mtd_start);
52 EXPORT_SYMBOL(mtd_size);
53 #endif
54
55 char __initdata command_line[COMMAND_LINE_SIZE];
56 void __initdata *init_retx, *init_saved_retx, *init_saved_seqstat,
57 *init_saved_icplb_fault_addr, *init_saved_dcplb_fault_addr;
58
59 /* boot memmap, for parsing "memmap=" */
60 #define BFIN_MEMMAP_MAX 128 /* number of entries in bfin_memmap */
61 #define BFIN_MEMMAP_RAM 1
62 #define BFIN_MEMMAP_RESERVED 2
63 static struct bfin_memmap {
64 int nr_map;
65 struct bfin_memmap_entry {
66 unsigned long long addr; /* start of memory segment */
67 unsigned long long size;
68 unsigned long type;
69 } map[BFIN_MEMMAP_MAX];
70 } bfin_memmap __initdata;
71
72 /* for memmap sanitization */
73 struct change_member {
74 struct bfin_memmap_entry *pentry; /* pointer to original entry */
75 unsigned long long addr; /* address for this change point */
76 };
77 static struct change_member change_point_list[2*BFIN_MEMMAP_MAX] __initdata;
78 static struct change_member *change_point[2*BFIN_MEMMAP_MAX] __initdata;
79 static struct bfin_memmap_entry *overlap_list[BFIN_MEMMAP_MAX] __initdata;
80 static struct bfin_memmap_entry new_map[BFIN_MEMMAP_MAX] __initdata;
81
82 DEFINE_PER_CPU(struct blackfin_cpudata, cpu_data);
83
84 static int early_init_clkin_hz(char *buf);
85
86 #if defined(CONFIG_BFIN_DCACHE) || defined(CONFIG_BFIN_ICACHE)
87 void __init generate_cplb_tables(void)
88 {
89 unsigned int cpu;
90
91 generate_cplb_tables_all();
92 /* Generate per-CPU I&D CPLB tables */
93 for (cpu = 0; cpu < num_possible_cpus(); ++cpu)
94 generate_cplb_tables_cpu(cpu);
95 }
96 #endif
97
98 void __cpuinit bfin_setup_caches(unsigned int cpu)
99 {
100 #ifdef CONFIG_BFIN_ICACHE
101 bfin_icache_init(icplb_tbl[cpu]);
102 #endif
103
104 #ifdef CONFIG_BFIN_DCACHE
105 bfin_dcache_init(dcplb_tbl[cpu]);
106 #endif
107
108 /*
109 * In cache coherence emulation mode, we need to have the
110 * D-cache enabled before running any atomic operation which
111 * might invove cache invalidation (i.e. spinlock, rwlock).
112 * So printk's are deferred until then.
113 */
114 #ifdef CONFIG_BFIN_ICACHE
115 printk(KERN_INFO "Instruction Cache Enabled for CPU%u\n", cpu);
116 #endif
117 #ifdef CONFIG_BFIN_DCACHE
118 printk(KERN_INFO "Data Cache Enabled for CPU%u"
119 # if defined CONFIG_BFIN_WB
120 " (write-back)"
121 # elif defined CONFIG_BFIN_WT
122 " (write-through)"
123 # endif
124 "\n", cpu);
125 #endif
126 }
127
128 void __cpuinit bfin_setup_cpudata(unsigned int cpu)
129 {
130 struct blackfin_cpudata *cpudata = &per_cpu(cpu_data, cpu);
131
132 cpudata->idle = current;
133 cpudata->loops_per_jiffy = loops_per_jiffy;
134 cpudata->imemctl = bfin_read_IMEM_CONTROL();
135 cpudata->dmemctl = bfin_read_DMEM_CONTROL();
136 }
137
138 void __init bfin_cache_init(void)
139 {
140 #if defined(CONFIG_BFIN_DCACHE) || defined(CONFIG_BFIN_ICACHE)
141 generate_cplb_tables();
142 #endif
143 bfin_setup_caches(0);
144 }
145
146 void __init bfin_relocate_l1_mem(void)
147 {
148 unsigned long l1_code_length;
149 unsigned long l1_data_a_length;
150 unsigned long l1_data_b_length;
151 unsigned long l2_length;
152
153 /*
154 * due to the ALIGN(4) in the arch/blackfin/kernel/vmlinux.lds.S
155 * we know that everything about l1 text/data is nice and aligned,
156 * so copy by 4 byte chunks, and don't worry about overlapping
157 * src/dest.
158 *
159 * We can't use the dma_memcpy functions, since they can call
160 * scheduler functions which might be in L1 :( and core writes
161 * into L1 instruction cause bad access errors, so we are stuck,
162 * we are required to use DMA, but can't use the common dma
163 * functions. We can't use memcpy either - since that might be
164 * going to be in the relocated L1
165 */
166
167 blackfin_dma_early_init();
168
169 /* if necessary, copy _stext_l1 to _etext_l1 to L1 instruction SRAM */
170 l1_code_length = _etext_l1 - _stext_l1;
171 if (l1_code_length)
172 early_dma_memcpy(_stext_l1, _l1_lma_start, l1_code_length);
173
174 /* if necessary, copy _sdata_l1 to _sbss_l1 to L1 data bank A SRAM */
175 l1_data_a_length = _sbss_l1 - _sdata_l1;
176 if (l1_data_a_length)
177 early_dma_memcpy(_sdata_l1, _l1_lma_start + l1_code_length, l1_data_a_length);
178
179 /* if necessary, copy _sdata_b_l1 to _sbss_b_l1 to L1 data bank B SRAM */
180 l1_data_b_length = _sbss_b_l1 - _sdata_b_l1;
181 if (l1_data_b_length)
182 early_dma_memcpy(_sdata_b_l1, _l1_lma_start + l1_code_length +
183 l1_data_a_length, l1_data_b_length);
184
185 early_dma_memcpy_done();
186
187 /* if necessary, copy _stext_l2 to _edata_l2 to L2 SRAM */
188 if (L2_LENGTH != 0) {
189 l2_length = _sbss_l2 - _stext_l2;
190 if (l2_length)
191 memcpy(_stext_l2, _l2_lma_start, l2_length);
192 }
193 }
194
195 /* add_memory_region to memmap */
196 static void __init add_memory_region(unsigned long long start,
197 unsigned long long size, int type)
198 {
199 int i;
200
201 i = bfin_memmap.nr_map;
202
203 if (i == BFIN_MEMMAP_MAX) {
204 printk(KERN_ERR "Ooops! Too many entries in the memory map!\n");
205 return;
206 }
207
208 bfin_memmap.map[i].addr = start;
209 bfin_memmap.map[i].size = size;
210 bfin_memmap.map[i].type = type;
211 bfin_memmap.nr_map++;
212 }
213
214 /*
215 * Sanitize the boot memmap, removing overlaps.
216 */
217 static int __init sanitize_memmap(struct bfin_memmap_entry *map, int *pnr_map)
218 {
219 struct change_member *change_tmp;
220 unsigned long current_type, last_type;
221 unsigned long long last_addr;
222 int chgidx, still_changing;
223 int overlap_entries;
224 int new_entry;
225 int old_nr, new_nr, chg_nr;
226 int i;
227
228 /*
229 Visually we're performing the following (1,2,3,4 = memory types)
230
231 Sample memory map (w/overlaps):
232 ____22__________________
233 ______________________4_
234 ____1111________________
235 _44_____________________
236 11111111________________
237 ____________________33__
238 ___________44___________
239 __________33333_________
240 ______________22________
241 ___________________2222_
242 _________111111111______
243 _____________________11_
244 _________________4______
245
246 Sanitized equivalent (no overlap):
247 1_______________________
248 _44_____________________
249 ___1____________________
250 ____22__________________
251 ______11________________
252 _________1______________
253 __________3_____________
254 ___________44___________
255 _____________33_________
256 _______________2________
257 ________________1_______
258 _________________4______
259 ___________________2____
260 ____________________33__
261 ______________________4_
262 */
263 /* if there's only one memory region, don't bother */
264 if (*pnr_map < 2)
265 return -1;
266
267 old_nr = *pnr_map;
268
269 /* bail out if we find any unreasonable addresses in memmap */
270 for (i = 0; i < old_nr; i++)
271 if (map[i].addr + map[i].size < map[i].addr)
272 return -1;
273
274 /* create pointers for initial change-point information (for sorting) */
275 for (i = 0; i < 2*old_nr; i++)
276 change_point[i] = &change_point_list[i];
277
278 /* record all known change-points (starting and ending addresses),
279 omitting those that are for empty memory regions */
280 chgidx = 0;
281 for (i = 0; i < old_nr; i++) {
282 if (map[i].size != 0) {
283 change_point[chgidx]->addr = map[i].addr;
284 change_point[chgidx++]->pentry = &map[i];
285 change_point[chgidx]->addr = map[i].addr + map[i].size;
286 change_point[chgidx++]->pentry = &map[i];
287 }
288 }
289 chg_nr = chgidx; /* true number of change-points */
290
291 /* sort change-point list by memory addresses (low -> high) */
292 still_changing = 1;
293 while (still_changing) {
294 still_changing = 0;
295 for (i = 1; i < chg_nr; i++) {
296 /* if <current_addr> > <last_addr>, swap */
297 /* or, if current=<start_addr> & last=<end_addr>, swap */
298 if ((change_point[i]->addr < change_point[i-1]->addr) ||
299 ((change_point[i]->addr == change_point[i-1]->addr) &&
300 (change_point[i]->addr == change_point[i]->pentry->addr) &&
301 (change_point[i-1]->addr != change_point[i-1]->pentry->addr))
302 ) {
303 change_tmp = change_point[i];
304 change_point[i] = change_point[i-1];
305 change_point[i-1] = change_tmp;
306 still_changing = 1;
307 }
308 }
309 }
310
311 /* create a new memmap, removing overlaps */
312 overlap_entries = 0; /* number of entries in the overlap table */
313 new_entry = 0; /* index for creating new memmap entries */
314 last_type = 0; /* start with undefined memory type */
315 last_addr = 0; /* start with 0 as last starting address */
316 /* loop through change-points, determining affect on the new memmap */
317 for (chgidx = 0; chgidx < chg_nr; chgidx++) {
318 /* keep track of all overlapping memmap entries */
319 if (change_point[chgidx]->addr == change_point[chgidx]->pentry->addr) {
320 /* add map entry to overlap list (> 1 entry implies an overlap) */
321 overlap_list[overlap_entries++] = change_point[chgidx]->pentry;
322 } else {
323 /* remove entry from list (order independent, so swap with last) */
324 for (i = 0; i < overlap_entries; i++) {
325 if (overlap_list[i] == change_point[chgidx]->pentry)
326 overlap_list[i] = overlap_list[overlap_entries-1];
327 }
328 overlap_entries--;
329 }
330 /* if there are overlapping entries, decide which "type" to use */
331 /* (larger value takes precedence -- 1=usable, 2,3,4,4+=unusable) */
332 current_type = 0;
333 for (i = 0; i < overlap_entries; i++)
334 if (overlap_list[i]->type > current_type)
335 current_type = overlap_list[i]->type;
336 /* continue building up new memmap based on this information */
337 if (current_type != last_type) {
338 if (last_type != 0) {
339 new_map[new_entry].size =
340 change_point[chgidx]->addr - last_addr;
341 /* move forward only if the new size was non-zero */
342 if (new_map[new_entry].size != 0)
343 if (++new_entry >= BFIN_MEMMAP_MAX)
344 break; /* no more space left for new entries */
345 }
346 if (current_type != 0) {
347 new_map[new_entry].addr = change_point[chgidx]->addr;
348 new_map[new_entry].type = current_type;
349 last_addr = change_point[chgidx]->addr;
350 }
351 last_type = current_type;
352 }
353 }
354 new_nr = new_entry; /* retain count for new entries */
355
356 /* copy new mapping into original location */
357 memcpy(map, new_map, new_nr*sizeof(struct bfin_memmap_entry));
358 *pnr_map = new_nr;
359
360 return 0;
361 }
362
363 static void __init print_memory_map(char *who)
364 {
365 int i;
366
367 for (i = 0; i < bfin_memmap.nr_map; i++) {
368 printk(KERN_DEBUG " %s: %016Lx - %016Lx ", who,
369 bfin_memmap.map[i].addr,
370 bfin_memmap.map[i].addr + bfin_memmap.map[i].size);
371 switch (bfin_memmap.map[i].type) {
372 case BFIN_MEMMAP_RAM:
373 printk("(usable)\n");
374 break;
375 case BFIN_MEMMAP_RESERVED:
376 printk("(reserved)\n");
377 break;
378 default: printk("type %lu\n", bfin_memmap.map[i].type);
379 break;
380 }
381 }
382 }
383
384 static __init int parse_memmap(char *arg)
385 {
386 unsigned long long start_at, mem_size;
387
388 if (!arg)
389 return -EINVAL;
390
391 mem_size = memparse(arg, &arg);
392 if (*arg == '@') {
393 start_at = memparse(arg+1, &arg);
394 add_memory_region(start_at, mem_size, BFIN_MEMMAP_RAM);
395 } else if (*arg == '$') {
396 start_at = memparse(arg+1, &arg);
397 add_memory_region(start_at, mem_size, BFIN_MEMMAP_RESERVED);
398 }
399
400 return 0;
401 }
402
403 /*
404 * Initial parsing of the command line. Currently, we support:
405 * - Controlling the linux memory size: mem=xxx[KMG]
406 * - Controlling the physical memory size: max_mem=xxx[KMG][$][#]
407 * $ -> reserved memory is dcacheable
408 * # -> reserved memory is icacheable
409 * - "memmap=XXX[KkmM][@][$]XXX[KkmM]" defines a memory region
410 * @ from <start> to <start>+<mem>, type RAM
411 * $ from <start> to <start>+<mem>, type RESERVED
412 */
413 static __init void parse_cmdline_early(char *cmdline_p)
414 {
415 char c = ' ', *to = cmdline_p;
416 unsigned int memsize;
417 for (;;) {
418 if (c == ' ') {
419 if (!memcmp(to, "mem=", 4)) {
420 to += 4;
421 memsize = memparse(to, &to);
422 if (memsize)
423 _ramend = memsize;
424
425 } else if (!memcmp(to, "max_mem=", 8)) {
426 to += 8;
427 memsize = memparse(to, &to);
428 if (memsize) {
429 physical_mem_end = memsize;
430 if (*to != ' ') {
431 if (*to == '$'
432 || *(to + 1) == '$')
433 reserved_mem_dcache_on = 1;
434 if (*to == '#'
435 || *(to + 1) == '#')
436 reserved_mem_icache_on = 1;
437 }
438 }
439 } else if (!memcmp(to, "clkin_hz=", 9)) {
440 to += 9;
441 early_init_clkin_hz(to);
442 } else if (!memcmp(to, "earlyprintk=", 12)) {
443 to += 12;
444 setup_early_printk(to);
445 } else if (!memcmp(to, "memmap=", 7)) {
446 to += 7;
447 parse_memmap(to);
448 }
449 }
450 c = *(to++);
451 if (!c)
452 break;
453 }
454 }
455
456 /*
457 * Setup memory defaults from user config.
458 * The physical memory layout looks like:
459 *
460 * [_rambase, _ramstart]: kernel image
461 * [memory_start, memory_end]: dynamic memory managed by kernel
462 * [memory_end, _ramend]: reserved memory
463 * [memory_mtd_start(memory_end),
464 * memory_mtd_start + mtd_size]: rootfs (if any)
465 * [_ramend - DMA_UNCACHED_REGION,
466 * _ramend]: uncached DMA region
467 * [_ramend, physical_mem_end]: memory not managed by kernel
468 */
469 static __init void memory_setup(void)
470 {
471 #ifdef CONFIG_MTD_UCLINUX
472 unsigned long mtd_phys = 0;
473 #endif
474
475 _rambase = (unsigned long)_stext;
476 _ramstart = (unsigned long)_end;
477
478 if (DMA_UNCACHED_REGION > (_ramend - _ramstart)) {
479 console_init();
480 panic("DMA region exceeds memory limit: %lu.",
481 _ramend - _ramstart);
482 }
483 memory_end = _ramend - DMA_UNCACHED_REGION;
484
485 #ifdef CONFIG_MPU
486 /* Round up to multiple of 4MB */
487 memory_start = (_ramstart + 0x3fffff) & ~0x3fffff;
488 #else
489 memory_start = PAGE_ALIGN(_ramstart);
490 #endif
491
492 #if defined(CONFIG_MTD_UCLINUX)
493 /* generic memory mapped MTD driver */
494 memory_mtd_end = memory_end;
495
496 mtd_phys = _ramstart;
497 mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 8)));
498
499 # if defined(CONFIG_EXT2_FS) || defined(CONFIG_EXT3_FS)
500 if (*((unsigned short *)(mtd_phys + 0x438)) == EXT2_SUPER_MAGIC)
501 mtd_size =
502 PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x404)) << 10);
503 # endif
504
505 # if defined(CONFIG_CRAMFS)
506 if (*((unsigned long *)(mtd_phys)) == CRAMFS_MAGIC)
507 mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x4)));
508 # endif
509
510 # if defined(CONFIG_ROMFS_FS)
511 if (((unsigned long *)mtd_phys)[0] == ROMSB_WORD0
512 && ((unsigned long *)mtd_phys)[1] == ROMSB_WORD1)
513 mtd_size =
514 PAGE_ALIGN(be32_to_cpu(((unsigned long *)mtd_phys)[2]));
515 # if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
516 /* Due to a Hardware Anomaly we need to limit the size of usable
517 * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
518 * 05000263 - Hardware loop corrupted when taking an ICPLB exception
519 */
520 # if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
521 if (memory_end >= 56 * 1024 * 1024)
522 memory_end = 56 * 1024 * 1024;
523 # else
524 if (memory_end >= 60 * 1024 * 1024)
525 memory_end = 60 * 1024 * 1024;
526 # endif /* CONFIG_DEBUG_HUNT_FOR_ZERO */
527 # endif /* ANOMALY_05000263 */
528 # endif /* CONFIG_ROMFS_FS */
529
530 memory_end -= mtd_size;
531
532 if (mtd_size == 0) {
533 console_init();
534 panic("Don't boot kernel without rootfs attached.");
535 }
536
537 /* Relocate MTD image to the top of memory after the uncached memory area */
538 dma_memcpy((char *)memory_end, _end, mtd_size);
539
540 memory_mtd_start = memory_end;
541 _ebss = memory_mtd_start; /* define _ebss for compatible */
542 #endif /* CONFIG_MTD_UCLINUX */
543
544 #if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
545 /* Due to a Hardware Anomaly we need to limit the size of usable
546 * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
547 * 05000263 - Hardware loop corrupted when taking an ICPLB exception
548 */
549 #if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
550 if (memory_end >= 56 * 1024 * 1024)
551 memory_end = 56 * 1024 * 1024;
552 #else
553 if (memory_end >= 60 * 1024 * 1024)
554 memory_end = 60 * 1024 * 1024;
555 #endif /* CONFIG_DEBUG_HUNT_FOR_ZERO */
556 printk(KERN_NOTICE "Warning: limiting memory to %liMB due to hardware anomaly 05000263\n", memory_end >> 20);
557 #endif /* ANOMALY_05000263 */
558
559 #ifdef CONFIG_MPU
560 page_mask_nelts = ((_ramend >> PAGE_SHIFT) + 31) / 32;
561 page_mask_order = get_order(3 * page_mask_nelts * sizeof(long));
562 #endif
563
564 #if !defined(CONFIG_MTD_UCLINUX)
565 /*In case there is no valid CPLB behind memory_end make sure we don't get to close*/
566 memory_end -= SIZE_4K;
567 #endif
568
569 init_mm.start_code = (unsigned long)_stext;
570 init_mm.end_code = (unsigned long)_etext;
571 init_mm.end_data = (unsigned long)_edata;
572 init_mm.brk = (unsigned long)0;
573
574 printk(KERN_INFO "Board Memory: %ldMB\n", physical_mem_end >> 20);
575 printk(KERN_INFO "Kernel Managed Memory: %ldMB\n", _ramend >> 20);
576
577 printk(KERN_INFO "Memory map:\n"
578 KERN_INFO " fixedcode = 0x%p-0x%p\n"
579 KERN_INFO " text = 0x%p-0x%p\n"
580 KERN_INFO " rodata = 0x%p-0x%p\n"
581 KERN_INFO " bss = 0x%p-0x%p\n"
582 KERN_INFO " data = 0x%p-0x%p\n"
583 KERN_INFO " stack = 0x%p-0x%p\n"
584 KERN_INFO " init = 0x%p-0x%p\n"
585 KERN_INFO " available = 0x%p-0x%p\n"
586 #ifdef CONFIG_MTD_UCLINUX
587 KERN_INFO " rootfs = 0x%p-0x%p\n"
588 #endif
589 #if DMA_UNCACHED_REGION > 0
590 KERN_INFO " DMA Zone = 0x%p-0x%p\n"
591 #endif
592 , (void *)FIXED_CODE_START, (void *)FIXED_CODE_END,
593 _stext, _etext,
594 __start_rodata, __end_rodata,
595 __bss_start, __bss_stop,
596 _sdata, _edata,
597 (void *)&init_thread_union,
598 (void *)((int)(&init_thread_union) + 0x2000),
599 __init_begin, __init_end,
600 (void *)_ramstart, (void *)memory_end
601 #ifdef CONFIG_MTD_UCLINUX
602 , (void *)memory_mtd_start, (void *)(memory_mtd_start + mtd_size)
603 #endif
604 #if DMA_UNCACHED_REGION > 0
605 , (void *)(_ramend - DMA_UNCACHED_REGION), (void *)(_ramend)
606 #endif
607 );
608 }
609
610 /*
611 * Find the lowest, highest page frame number we have available
612 */
613 void __init find_min_max_pfn(void)
614 {
615 int i;
616
617 max_pfn = 0;
618 min_low_pfn = memory_end;
619
620 for (i = 0; i < bfin_memmap.nr_map; i++) {
621 unsigned long start, end;
622 /* RAM? */
623 if (bfin_memmap.map[i].type != BFIN_MEMMAP_RAM)
624 continue;
625 start = PFN_UP(bfin_memmap.map[i].addr);
626 end = PFN_DOWN(bfin_memmap.map[i].addr +
627 bfin_memmap.map[i].size);
628 if (start >= end)
629 continue;
630 if (end > max_pfn)
631 max_pfn = end;
632 if (start < min_low_pfn)
633 min_low_pfn = start;
634 }
635 }
636
637 static __init void setup_bootmem_allocator(void)
638 {
639 int bootmap_size;
640 int i;
641 unsigned long start_pfn, end_pfn;
642 unsigned long curr_pfn, last_pfn, size;
643
644 /* mark memory between memory_start and memory_end usable */
645 add_memory_region(memory_start,
646 memory_end - memory_start, BFIN_MEMMAP_RAM);
647 /* sanity check for overlap */
648 sanitize_memmap(bfin_memmap.map, &bfin_memmap.nr_map);
649 print_memory_map("boot memmap");
650
651 /* intialize globals in linux/bootmem.h */
652 find_min_max_pfn();
653 /* pfn of the last usable page frame */
654 if (max_pfn > memory_end >> PAGE_SHIFT)
655 max_pfn = memory_end >> PAGE_SHIFT;
656 /* pfn of last page frame directly mapped by kernel */
657 max_low_pfn = max_pfn;
658 /* pfn of the first usable page frame after kernel image*/
659 if (min_low_pfn < memory_start >> PAGE_SHIFT)
660 min_low_pfn = memory_start >> PAGE_SHIFT;
661
662 start_pfn = PAGE_OFFSET >> PAGE_SHIFT;
663 end_pfn = memory_end >> PAGE_SHIFT;
664
665 /*
666 * give all the memory to the bootmap allocator, tell it to put the
667 * boot mem_map at the start of memory.
668 */
669 bootmap_size = init_bootmem_node(NODE_DATA(0),
670 memory_start >> PAGE_SHIFT, /* map goes here */
671 start_pfn, end_pfn);
672
673 /* register the memmap regions with the bootmem allocator */
674 for (i = 0; i < bfin_memmap.nr_map; i++) {
675 /*
676 * Reserve usable memory
677 */
678 if (bfin_memmap.map[i].type != BFIN_MEMMAP_RAM)
679 continue;
680 /*
681 * We are rounding up the start address of usable memory:
682 */
683 curr_pfn = PFN_UP(bfin_memmap.map[i].addr);
684 if (curr_pfn >= end_pfn)
685 continue;
686 /*
687 * ... and at the end of the usable range downwards:
688 */
689 last_pfn = PFN_DOWN(bfin_memmap.map[i].addr +
690 bfin_memmap.map[i].size);
691
692 if (last_pfn > end_pfn)
693 last_pfn = end_pfn;
694
695 /*
696 * .. finally, did all the rounding and playing
697 * around just make the area go away?
698 */
699 if (last_pfn <= curr_pfn)
700 continue;
701
702 size = last_pfn - curr_pfn;
703 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
704 }
705
706 /* reserve memory before memory_start, including bootmap */
707 reserve_bootmem(PAGE_OFFSET,
708 memory_start + bootmap_size + PAGE_SIZE - 1 - PAGE_OFFSET,
709 BOOTMEM_DEFAULT);
710 }
711
712 #define EBSZ_TO_MEG(ebsz) \
713 ({ \
714 int meg = 0; \
715 switch (ebsz & 0xf) { \
716 case 0x1: meg = 16; break; \
717 case 0x3: meg = 32; break; \
718 case 0x5: meg = 64; break; \
719 case 0x7: meg = 128; break; \
720 case 0x9: meg = 256; break; \
721 case 0xb: meg = 512; break; \
722 } \
723 meg; \
724 })
725 static inline int __init get_mem_size(void)
726 {
727 #if defined(EBIU_SDBCTL)
728 # if defined(BF561_FAMILY)
729 int ret = 0;
730 u32 sdbctl = bfin_read_EBIU_SDBCTL();
731 ret += EBSZ_TO_MEG(sdbctl >> 0);
732 ret += EBSZ_TO_MEG(sdbctl >> 8);
733 ret += EBSZ_TO_MEG(sdbctl >> 16);
734 ret += EBSZ_TO_MEG(sdbctl >> 24);
735 return ret;
736 # else
737 return EBSZ_TO_MEG(bfin_read_EBIU_SDBCTL());
738 # endif
739 #elif defined(EBIU_DDRCTL1)
740 u32 ddrctl = bfin_read_EBIU_DDRCTL1();
741 int ret = 0;
742 switch (ddrctl & 0xc0000) {
743 case DEVSZ_64: ret = 64 / 8;
744 case DEVSZ_128: ret = 128 / 8;
745 case DEVSZ_256: ret = 256 / 8;
746 case DEVSZ_512: ret = 512 / 8;
747 }
748 switch (ddrctl & 0x30000) {
749 case DEVWD_4: ret *= 2;
750 case DEVWD_8: ret *= 2;
751 case DEVWD_16: break;
752 }
753 if ((ddrctl & 0xc000) == 0x4000)
754 ret *= 2;
755 return ret;
756 #endif
757 BUG();
758 }
759
760 void __init setup_arch(char **cmdline_p)
761 {
762 unsigned long sclk, cclk;
763
764 #ifdef CONFIG_DUMMY_CONSOLE
765 conswitchp = &dummy_con;
766 #endif
767
768 #if defined(CONFIG_CMDLINE_BOOL)
769 strncpy(&command_line[0], CONFIG_CMDLINE, sizeof(command_line));
770 command_line[sizeof(command_line) - 1] = 0;
771 #endif
772
773 /* Keep a copy of command line */
774 *cmdline_p = &command_line[0];
775 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
776 boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';
777
778 /* setup memory defaults from the user config */
779 physical_mem_end = 0;
780 _ramend = get_mem_size() * 1024 * 1024;
781
782 memset(&bfin_memmap, 0, sizeof(bfin_memmap));
783
784 parse_cmdline_early(&command_line[0]);
785
786 if (physical_mem_end == 0)
787 physical_mem_end = _ramend;
788
789 memory_setup();
790
791 /* Initialize Async memory banks */
792 bfin_write_EBIU_AMBCTL0(AMBCTL0VAL);
793 bfin_write_EBIU_AMBCTL1(AMBCTL1VAL);
794 bfin_write_EBIU_AMGCTL(AMGCTLVAL);
795 #ifdef CONFIG_EBIU_MBSCTLVAL
796 bfin_write_EBIU_MBSCTL(CONFIG_EBIU_MBSCTLVAL);
797 bfin_write_EBIU_MODE(CONFIG_EBIU_MODEVAL);
798 bfin_write_EBIU_FCTL(CONFIG_EBIU_FCTLVAL);
799 #endif
800
801 cclk = get_cclk();
802 sclk = get_sclk();
803
804 if ((ANOMALY_05000273 || ANOMALY_05000274) && (cclk >> 1) < sclk)
805 panic("ANOMALY 05000273 or 05000274: CCLK must be >= 2*SCLK");
806
807 #ifdef BF561_FAMILY
808 if (ANOMALY_05000266) {
809 bfin_read_IMDMA_D0_IRQ_STATUS();
810 bfin_read_IMDMA_D1_IRQ_STATUS();
811 }
812 #endif
813 printk(KERN_INFO "Hardware Trace ");
814 if (bfin_read_TBUFCTL() & 0x1)
815 printk("Active ");
816 else
817 printk("Off ");
818 if (bfin_read_TBUFCTL() & 0x2)
819 printk("and Enabled\n");
820 else
821 printk("and Disabled\n");
822
823 #if defined(CONFIG_CHR_DEV_FLASH) || defined(CONFIG_BLK_DEV_FLASH)
824 /* we need to initialize the Flashrom device here since we might
825 * do things with flash early on in the boot
826 */
827 flash_probe();
828 #endif
829
830 printk(KERN_INFO "Boot Mode: %i\n", bfin_read_SYSCR() & 0xF);
831
832 /* Newer parts mirror SWRST bits in SYSCR */
833 #if defined(CONFIG_BF53x) || defined(CONFIG_BF561) || \
834 defined(CONFIG_BF538) || defined(CONFIG_BF539)
835 _bfin_swrst = bfin_read_SWRST();
836 #else
837 _bfin_swrst = bfin_read_SYSCR();
838 #endif
839
840 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
841 bfin_write_SWRST(_bfin_swrst & ~DOUBLE_FAULT);
842 #endif
843 #ifdef CONFIG_DEBUG_DOUBLEFAULT_RESET
844 bfin_write_SWRST(_bfin_swrst | DOUBLE_FAULT);
845 #endif
846
847 #ifdef CONFIG_SMP
848 if (_bfin_swrst & SWRST_DBL_FAULT_A) {
849 #else
850 if (_bfin_swrst & RESET_DOUBLE) {
851 #endif
852 printk(KERN_EMERG "Recovering from DOUBLE FAULT event\n");
853 #ifdef CONFIG_DEBUG_DOUBLEFAULT
854 /* We assume the crashing kernel, and the current symbol table match */
855 printk(KERN_EMERG " While handling exception (EXCAUSE = 0x%x) at %pF\n",
856 (int)init_saved_seqstat & SEQSTAT_EXCAUSE, init_saved_retx);
857 printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %pF\n", init_saved_dcplb_fault_addr);
858 printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %pF\n", init_saved_icplb_fault_addr);
859 #endif
860 printk(KERN_NOTICE " The instruction at %pF caused a double exception\n",
861 init_retx);
862 } else if (_bfin_swrst & RESET_WDOG)
863 printk(KERN_INFO "Recovering from Watchdog event\n");
864 else if (_bfin_swrst & RESET_SOFTWARE)
865 printk(KERN_NOTICE "Reset caused by Software reset\n");
866
867 printk(KERN_INFO "Blackfin support (C) 2004-2009 Analog Devices, Inc.\n");
868 if (bfin_compiled_revid() == 0xffff)
869 printk(KERN_INFO "Compiled for ADSP-%s Rev any\n", CPU);
870 else if (bfin_compiled_revid() == -1)
871 printk(KERN_INFO "Compiled for ADSP-%s Rev none\n", CPU);
872 else
873 printk(KERN_INFO "Compiled for ADSP-%s Rev 0.%d\n", CPU, bfin_compiled_revid());
874
875 if (unlikely(CPUID != bfin_cpuid()))
876 printk(KERN_ERR "ERROR: Not running on ADSP-%s: unknown CPUID 0x%04x Rev 0.%d\n",
877 CPU, bfin_cpuid(), bfin_revid());
878 else {
879 if (bfin_revid() != bfin_compiled_revid()) {
880 if (bfin_compiled_revid() == -1)
881 printk(KERN_ERR "Warning: Compiled for Rev none, but running on Rev %d\n",
882 bfin_revid());
883 else if (bfin_compiled_revid() != 0xffff) {
884 printk(KERN_ERR "Warning: Compiled for Rev %d, but running on Rev %d\n",
885 bfin_compiled_revid(), bfin_revid());
886 if (bfin_compiled_revid() > bfin_revid())
887 panic("Error: you are missing anomaly workarounds for this rev");
888 }
889 }
890 if (bfin_revid() < CONFIG_BF_REV_MIN || bfin_revid() > CONFIG_BF_REV_MAX)
891 printk(KERN_ERR "Warning: Unsupported Chip Revision ADSP-%s Rev 0.%d detected\n",
892 CPU, bfin_revid());
893 }
894
895 /* We can't run on BF548-0.1 due to ANOMALY 05000448 */
896 if (bfin_cpuid() == 0x27de && bfin_revid() == 1)
897 panic("You can't run on this processor due to 05000448");
898
899 printk(KERN_INFO "Blackfin Linux support by http://blackfin.uclinux.org/\n");
900
901 printk(KERN_INFO "Processor Speed: %lu MHz core clock and %lu MHz System Clock\n",
902 cclk / 1000000, sclk / 1000000);
903
904 setup_bootmem_allocator();
905
906 paging_init();
907
908 /* Copy atomic sequences to their fixed location, and sanity check that
909 these locations are the ones that we advertise to userspace. */
910 memcpy((void *)FIXED_CODE_START, &fixed_code_start,
911 FIXED_CODE_END - FIXED_CODE_START);
912 BUG_ON((char *)&sigreturn_stub - (char *)&fixed_code_start
913 != SIGRETURN_STUB - FIXED_CODE_START);
914 BUG_ON((char *)&atomic_xchg32 - (char *)&fixed_code_start
915 != ATOMIC_XCHG32 - FIXED_CODE_START);
916 BUG_ON((char *)&atomic_cas32 - (char *)&fixed_code_start
917 != ATOMIC_CAS32 - FIXED_CODE_START);
918 BUG_ON((char *)&atomic_add32 - (char *)&fixed_code_start
919 != ATOMIC_ADD32 - FIXED_CODE_START);
920 BUG_ON((char *)&atomic_sub32 - (char *)&fixed_code_start
921 != ATOMIC_SUB32 - FIXED_CODE_START);
922 BUG_ON((char *)&atomic_ior32 - (char *)&fixed_code_start
923 != ATOMIC_IOR32 - FIXED_CODE_START);
924 BUG_ON((char *)&atomic_and32 - (char *)&fixed_code_start
925 != ATOMIC_AND32 - FIXED_CODE_START);
926 BUG_ON((char *)&atomic_xor32 - (char *)&fixed_code_start
927 != ATOMIC_XOR32 - FIXED_CODE_START);
928 BUG_ON((char *)&safe_user_instruction - (char *)&fixed_code_start
929 != SAFE_USER_INSTRUCTION - FIXED_CODE_START);
930
931 #ifdef CONFIG_SMP
932 platform_init_cpus();
933 #endif
934 init_exception_vectors();
935 bfin_cache_init(); /* Initialize caches for the boot CPU */
936 }
937
938 static int __init topology_init(void)
939 {
940 unsigned int cpu;
941 /* Record CPU-private information for the boot processor. */
942 bfin_setup_cpudata(0);
943
944 for_each_possible_cpu(cpu) {
945 register_cpu(&per_cpu(cpu_data, cpu).cpu, cpu);
946 }
947
948 return 0;
949 }
950
951 subsys_initcall(topology_init);
952
953 /* Get the input clock frequency */
954 static u_long cached_clkin_hz = CONFIG_CLKIN_HZ;
955 static u_long get_clkin_hz(void)
956 {
957 return cached_clkin_hz;
958 }
959 static int __init early_init_clkin_hz(char *buf)
960 {
961 cached_clkin_hz = simple_strtoul(buf, NULL, 0);
962 #ifdef BFIN_KERNEL_CLOCK
963 if (cached_clkin_hz != CONFIG_CLKIN_HZ)
964 panic("cannot change clkin_hz when reprogramming clocks");
965 #endif
966 return 1;
967 }
968 early_param("clkin_hz=", early_init_clkin_hz);
969
970 /* Get the voltage input multiplier */
971 static u_long get_vco(void)
972 {
973 static u_long cached_vco;
974 u_long msel, pll_ctl;
975
976 /* The assumption here is that VCO never changes at runtime.
977 * If, someday, we support that, then we'll have to change this.
978 */
979 if (cached_vco)
980 return cached_vco;
981
982 pll_ctl = bfin_read_PLL_CTL();
983 msel = (pll_ctl >> 9) & 0x3F;
984 if (0 == msel)
985 msel = 64;
986
987 cached_vco = get_clkin_hz();
988 cached_vco >>= (1 & pll_ctl); /* DF bit */
989 cached_vco *= msel;
990 return cached_vco;
991 }
992
993 /* Get the Core clock */
994 u_long get_cclk(void)
995 {
996 static u_long cached_cclk_pll_div, cached_cclk;
997 u_long csel, ssel;
998
999 if (bfin_read_PLL_STAT() & 0x1)
1000 return get_clkin_hz();
1001
1002 ssel = bfin_read_PLL_DIV();
1003 if (ssel == cached_cclk_pll_div)
1004 return cached_cclk;
1005 else
1006 cached_cclk_pll_div = ssel;
1007
1008 csel = ((ssel >> 4) & 0x03);
1009 ssel &= 0xf;
1010 if (ssel && ssel < (1 << csel)) /* SCLK > CCLK */
1011 cached_cclk = get_vco() / ssel;
1012 else
1013 cached_cclk = get_vco() >> csel;
1014 return cached_cclk;
1015 }
1016 EXPORT_SYMBOL(get_cclk);
1017
1018 /* Get the System clock */
1019 u_long get_sclk(void)
1020 {
1021 static u_long cached_sclk;
1022 u_long ssel;
1023
1024 /* The assumption here is that SCLK never changes at runtime.
1025 * If, someday, we support that, then we'll have to change this.
1026 */
1027 if (cached_sclk)
1028 return cached_sclk;
1029
1030 if (bfin_read_PLL_STAT() & 0x1)
1031 return get_clkin_hz();
1032
1033 ssel = bfin_read_PLL_DIV() & 0xf;
1034 if (0 == ssel) {
1035 printk(KERN_WARNING "Invalid System Clock\n");
1036 ssel = 1;
1037 }
1038
1039 cached_sclk = get_vco() / ssel;
1040 return cached_sclk;
1041 }
1042 EXPORT_SYMBOL(get_sclk);
1043
1044 unsigned long sclk_to_usecs(unsigned long sclk)
1045 {
1046 u64 tmp = USEC_PER_SEC * (u64)sclk;
1047 do_div(tmp, get_sclk());
1048 return tmp;
1049 }
1050 EXPORT_SYMBOL(sclk_to_usecs);
1051
1052 unsigned long usecs_to_sclk(unsigned long usecs)
1053 {
1054 u64 tmp = get_sclk() * (u64)usecs;
1055 do_div(tmp, USEC_PER_SEC);
1056 return tmp;
1057 }
1058 EXPORT_SYMBOL(usecs_to_sclk);
1059
1060 /*
1061 * Get CPU information for use by the procfs.
1062 */
1063 static int show_cpuinfo(struct seq_file *m, void *v)
1064 {
1065 char *cpu, *mmu, *fpu, *vendor, *cache;
1066 uint32_t revid;
1067 int cpu_num = *(unsigned int *)v;
1068 u_long sclk, cclk;
1069 u_int icache_size = BFIN_ICACHESIZE / 1024, dcache_size = 0, dsup_banks = 0;
1070 struct blackfin_cpudata *cpudata = &per_cpu(cpu_data, cpu_num);
1071
1072 cpu = CPU;
1073 mmu = "none";
1074 fpu = "none";
1075 revid = bfin_revid();
1076
1077 sclk = get_sclk();
1078 cclk = get_cclk();
1079
1080 switch (bfin_read_CHIPID() & CHIPID_MANUFACTURE) {
1081 case 0xca:
1082 vendor = "Analog Devices";
1083 break;
1084 default:
1085 vendor = "unknown";
1086 break;
1087 }
1088
1089 seq_printf(m, "processor\t: %d\n" "vendor_id\t: %s\n", cpu_num, vendor);
1090
1091 if (CPUID == bfin_cpuid())
1092 seq_printf(m, "cpu family\t: 0x%04x\n", CPUID);
1093 else
1094 seq_printf(m, "cpu family\t: Compiled for:0x%04x, running on:0x%04x\n",
1095 CPUID, bfin_cpuid());
1096
1097 seq_printf(m, "model name\t: ADSP-%s %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n"
1098 "stepping\t: %d\n",
1099 cpu, cclk/1000000, sclk/1000000,
1100 #ifdef CONFIG_MPU
1101 "mpu on",
1102 #else
1103 "mpu off",
1104 #endif
1105 revid);
1106
1107 seq_printf(m, "cpu MHz\t\t: %lu.%03lu/%lu.%03lu\n",
1108 cclk/1000000, cclk%1000000,
1109 sclk/1000000, sclk%1000000);
1110 seq_printf(m, "bogomips\t: %lu.%02lu\n"
1111 "Calibration\t: %lu loops\n",
1112 (cpudata->loops_per_jiffy * HZ) / 500000,
1113 ((cpudata->loops_per_jiffy * HZ) / 5000) % 100,
1114 (cpudata->loops_per_jiffy * HZ));
1115
1116 /* Check Cache configutation */
1117 switch (cpudata->dmemctl & (1 << DMC0_P | 1 << DMC1_P)) {
1118 case ACACHE_BSRAM:
1119 cache = "dbank-A/B\t: cache/sram";
1120 dcache_size = 16;
1121 dsup_banks = 1;
1122 break;
1123 case ACACHE_BCACHE:
1124 cache = "dbank-A/B\t: cache/cache";
1125 dcache_size = 32;
1126 dsup_banks = 2;
1127 break;
1128 case ASRAM_BSRAM:
1129 cache = "dbank-A/B\t: sram/sram";
1130 dcache_size = 0;
1131 dsup_banks = 0;
1132 break;
1133 default:
1134 cache = "unknown";
1135 dcache_size = 0;
1136 dsup_banks = 0;
1137 break;
1138 }
1139
1140 /* Is it turned on? */
1141 if ((cpudata->dmemctl & (ENDCPLB | DMC_ENABLE)) != (ENDCPLB | DMC_ENABLE))
1142 dcache_size = 0;
1143
1144 if ((cpudata->imemctl & (IMC | ENICPLB)) != (IMC | ENICPLB))
1145 icache_size = 0;
1146
1147 seq_printf(m, "cache size\t: %d KB(L1 icache) "
1148 "%d KB(L1 dcache%s) %d KB(L2 cache)\n",
1149 icache_size, dcache_size,
1150 #if defined CONFIG_BFIN_WB
1151 "-wb"
1152 #elif defined CONFIG_BFIN_WT
1153 "-wt"
1154 #endif
1155 "", 0);
1156
1157 seq_printf(m, "%s\n", cache);
1158
1159 if (icache_size)
1160 seq_printf(m, "icache setup\t: %d Sub-banks/%d Ways, %d Lines/Way\n",
1161 BFIN_ISUBBANKS, BFIN_IWAYS, BFIN_ILINES);
1162 else
1163 seq_printf(m, "icache setup\t: off\n");
1164
1165 seq_printf(m,
1166 "dcache setup\t: %d Super-banks/%d Sub-banks/%d Ways, %d Lines/Way\n",
1167 dsup_banks, BFIN_DSUBBANKS, BFIN_DWAYS,
1168 BFIN_DLINES);
1169 #ifdef __ARCH_SYNC_CORE_DCACHE
1170 seq_printf(m, "SMP Dcache Flushes\t: %lu\n\n", cpudata->dcache_invld_count);
1171 #endif
1172 #ifdef CONFIG_BFIN_ICACHE_LOCK
1173 switch ((cpudata->imemctl >> 3) & WAYALL_L) {
1174 case WAY0_L:
1175 seq_printf(m, "Way0 Locked-Down\n");
1176 break;
1177 case WAY1_L:
1178 seq_printf(m, "Way1 Locked-Down\n");
1179 break;
1180 case WAY01_L:
1181 seq_printf(m, "Way0,Way1 Locked-Down\n");
1182 break;
1183 case WAY2_L:
1184 seq_printf(m, "Way2 Locked-Down\n");
1185 break;
1186 case WAY02_L:
1187 seq_printf(m, "Way0,Way2 Locked-Down\n");
1188 break;
1189 case WAY12_L:
1190 seq_printf(m, "Way1,Way2 Locked-Down\n");
1191 break;
1192 case WAY012_L:
1193 seq_printf(m, "Way0,Way1 & Way2 Locked-Down\n");
1194 break;
1195 case WAY3_L:
1196 seq_printf(m, "Way3 Locked-Down\n");
1197 break;
1198 case WAY03_L:
1199 seq_printf(m, "Way0,Way3 Locked-Down\n");
1200 break;
1201 case WAY13_L:
1202 seq_printf(m, "Way1,Way3 Locked-Down\n");
1203 break;
1204 case WAY013_L:
1205 seq_printf(m, "Way 0,Way1,Way3 Locked-Down\n");
1206 break;
1207 case WAY32_L:
1208 seq_printf(m, "Way3,Way2 Locked-Down\n");
1209 break;
1210 case WAY320_L:
1211 seq_printf(m, "Way3,Way2,Way0 Locked-Down\n");
1212 break;
1213 case WAY321_L:
1214 seq_printf(m, "Way3,Way2,Way1 Locked-Down\n");
1215 break;
1216 case WAYALL_L:
1217 seq_printf(m, "All Ways are locked\n");
1218 break;
1219 default:
1220 seq_printf(m, "No Ways are locked\n");
1221 }
1222 #endif
1223
1224 if (cpu_num != num_possible_cpus() - 1)
1225 return 0;
1226
1227 if (L2_LENGTH)
1228 seq_printf(m, "L2 SRAM\t\t: %dKB\n", L2_LENGTH/0x400);
1229 seq_printf(m, "board name\t: %s\n", bfin_board_name);
1230 seq_printf(m, "board memory\t: %ld kB (0x%p -> 0x%p)\n",
1231 physical_mem_end >> 10, (void *)0, (void *)physical_mem_end);
1232 seq_printf(m, "kernel memory\t: %d kB (0x%p -> 0x%p)\n",
1233 ((int)memory_end - (int)_stext) >> 10,
1234 _stext,
1235 (void *)memory_end);
1236 seq_printf(m, "\n");
1237
1238 return 0;
1239 }
1240
1241 static void *c_start(struct seq_file *m, loff_t *pos)
1242 {
1243 if (*pos == 0)
1244 *pos = first_cpu(cpu_online_map);
1245 if (*pos >= num_online_cpus())
1246 return NULL;
1247
1248 return pos;
1249 }
1250
1251 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1252 {
1253 *pos = next_cpu(*pos, cpu_online_map);
1254
1255 return c_start(m, pos);
1256 }
1257
1258 static void c_stop(struct seq_file *m, void *v)
1259 {
1260 }
1261
1262 const struct seq_operations cpuinfo_op = {
1263 .start = c_start,
1264 .next = c_next,
1265 .stop = c_stop,
1266 .show = show_cpuinfo,
1267 };
1268
1269 void __init cmdline_init(const char *r0)
1270 {
1271 if (r0)
1272 strncpy(command_line, r0, COMMAND_LINE_SIZE);
1273 }
(deprecated) Btrfs devel tree