2 * arch/blackfin/kernel/setup.c
4 * Copyright 2004-2006 Analog Devices Inc.
6 * Enter bugs at http://blackfin.uclinux.org/
8 * Licensed under the GPL-2 or later.
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>
17 #include <linux/module.h>
18 #include <linux/tty.h>
19 #include <linux/pfn.h>
21 #ifdef CONFIG_MTD_UCLINUX
22 #include <linux/mtd/map.h>
23 #include <linux/ext2_fs.h>
24 #include <linux/cramfs_fs.h>
25 #include <linux/romfs_fs.h>
29 #include <asm/cacheflush.h>
30 #include <asm/blackfin.h>
31 #include <asm/cplbinit.h>
32 #include <asm/div64.h>
34 #include <asm/fixed_code.h>
35 #include <asm/early_printk.h>
38 EXPORT_SYMBOL(_bfin_swrst
);
40 unsigned long memory_start
, memory_end
, physical_mem_end
;
41 unsigned long _rambase
, _ramstart
, _ramend
;
42 unsigned long reserved_mem_dcache_on
;
43 unsigned long reserved_mem_icache_on
;
44 EXPORT_SYMBOL(memory_start
);
45 EXPORT_SYMBOL(memory_end
);
46 EXPORT_SYMBOL(physical_mem_end
);
47 EXPORT_SYMBOL(_ramend
);
48 EXPORT_SYMBOL(reserved_mem_dcache_on
);
50 #ifdef CONFIG_MTD_UCLINUX
51 extern struct map_info uclinux_ram_map
;
52 unsigned long memory_mtd_end
, memory_mtd_start
, mtd_size
;
54 EXPORT_SYMBOL(memory_mtd_end
);
55 EXPORT_SYMBOL(memory_mtd_start
);
56 EXPORT_SYMBOL(mtd_size
);
59 char __initdata command_line
[COMMAND_LINE_SIZE
];
60 void __initdata
*init_retx
, *init_saved_retx
, *init_saved_seqstat
,
61 *init_saved_icplb_fault_addr
, *init_saved_dcplb_fault_addr
;
63 /* boot memmap, for parsing "memmap=" */
64 #define BFIN_MEMMAP_MAX 128 /* number of entries in bfin_memmap */
65 #define BFIN_MEMMAP_RAM 1
66 #define BFIN_MEMMAP_RESERVED 2
67 static struct bfin_memmap
{
69 struct bfin_memmap_entry
{
70 unsigned long long addr
; /* start of memory segment */
71 unsigned long long size
;
73 } map
[BFIN_MEMMAP_MAX
];
74 } bfin_memmap __initdata
;
76 /* for memmap sanitization */
77 struct change_member
{
78 struct bfin_memmap_entry
*pentry
; /* pointer to original entry */
79 unsigned long long addr
; /* address for this change point */
81 static struct change_member change_point_list
[2*BFIN_MEMMAP_MAX
] __initdata
;
82 static struct change_member
*change_point
[2*BFIN_MEMMAP_MAX
] __initdata
;
83 static struct bfin_memmap_entry
*overlap_list
[BFIN_MEMMAP_MAX
] __initdata
;
84 static struct bfin_memmap_entry new_map
[BFIN_MEMMAP_MAX
] __initdata
;
86 DEFINE_PER_CPU(struct blackfin_cpudata
, cpu_data
);
88 static int early_init_clkin_hz(char *buf
);
90 #if defined(CONFIG_BFIN_DCACHE) || defined(CONFIG_BFIN_ICACHE)
91 void __init
generate_cplb_tables(void)
95 generate_cplb_tables_all();
96 /* Generate per-CPU I&D CPLB tables */
97 for (cpu
= 0; cpu
< num_possible_cpus(); ++cpu
)
98 generate_cplb_tables_cpu(cpu
);
102 void __cpuinit
bfin_setup_caches(unsigned int cpu
)
104 #ifdef CONFIG_BFIN_ICACHE
105 bfin_icache_init(icplb_tbl
[cpu
]);
108 #ifdef CONFIG_BFIN_DCACHE
109 bfin_dcache_init(dcplb_tbl
[cpu
]);
113 * In cache coherence emulation mode, we need to have the
114 * D-cache enabled before running any atomic operation which
115 * might invove cache invalidation (i.e. spinlock, rwlock).
116 * So printk's are deferred until then.
118 #ifdef CONFIG_BFIN_ICACHE
119 printk(KERN_INFO
"Instruction Cache Enabled for CPU%u\n", cpu
);
121 #ifdef CONFIG_BFIN_DCACHE
122 printk(KERN_INFO
"Data Cache Enabled for CPU%u"
123 # if defined CONFIG_BFIN_WB
125 # elif defined CONFIG_BFIN_WT
132 void __cpuinit
bfin_setup_cpudata(unsigned int cpu
)
134 struct blackfin_cpudata
*cpudata
= &per_cpu(cpu_data
, cpu
);
136 cpudata
->idle
= current
;
137 cpudata
->loops_per_jiffy
= loops_per_jiffy
;
138 cpudata
->imemctl
= bfin_read_IMEM_CONTROL();
139 cpudata
->dmemctl
= bfin_read_DMEM_CONTROL();
142 void __init
bfin_cache_init(void)
144 #if defined(CONFIG_BFIN_DCACHE) || defined(CONFIG_BFIN_ICACHE)
145 generate_cplb_tables();
147 bfin_setup_caches(0);
150 void __init
bfin_relocate_l1_mem(void)
152 unsigned long l1_code_length
;
153 unsigned long l1_data_a_length
;
154 unsigned long l1_data_b_length
;
155 unsigned long l2_length
;
158 * due to the ALIGN(4) in the arch/blackfin/kernel/vmlinux.lds.S
159 * we know that everything about l1 text/data is nice and aligned,
160 * so copy by 4 byte chunks, and don't worry about overlapping
163 * We can't use the dma_memcpy functions, since they can call
164 * scheduler functions which might be in L1 :( and core writes
165 * into L1 instruction cause bad access errors, so we are stuck,
166 * we are required to use DMA, but can't use the common dma
167 * functions. We can't use memcpy either - since that might be
168 * going to be in the relocated L1
171 blackfin_dma_early_init();
173 /* if necessary, copy _stext_l1 to _etext_l1 to L1 instruction SRAM */
174 l1_code_length
= _etext_l1
- _stext_l1
;
176 early_dma_memcpy(_stext_l1
, _l1_lma_start
, l1_code_length
);
178 /* if necessary, copy _sdata_l1 to _sbss_l1 to L1 data bank A SRAM */
179 l1_data_a_length
= _sbss_l1
- _sdata_l1
;
180 if (l1_data_a_length
)
181 early_dma_memcpy(_sdata_l1
, _l1_lma_start
+ l1_code_length
, l1_data_a_length
);
183 /* if necessary, copy _sdata_b_l1 to _sbss_b_l1 to L1 data bank B SRAM */
184 l1_data_b_length
= _sbss_b_l1
- _sdata_b_l1
;
185 if (l1_data_b_length
)
186 early_dma_memcpy(_sdata_b_l1
, _l1_lma_start
+ l1_code_length
+
187 l1_data_a_length
, l1_data_b_length
);
189 early_dma_memcpy_done();
191 /* if necessary, copy _stext_l2 to _edata_l2 to L2 SRAM */
192 if (L2_LENGTH
!= 0) {
193 l2_length
= _sbss_l2
- _stext_l2
;
195 memcpy(_stext_l2
, _l2_lma_start
, l2_length
);
199 /* add_memory_region to memmap */
200 static void __init
add_memory_region(unsigned long long start
,
201 unsigned long long size
, int type
)
205 i
= bfin_memmap
.nr_map
;
207 if (i
== BFIN_MEMMAP_MAX
) {
208 printk(KERN_ERR
"Ooops! Too many entries in the memory map!\n");
212 bfin_memmap
.map
[i
].addr
= start
;
213 bfin_memmap
.map
[i
].size
= size
;
214 bfin_memmap
.map
[i
].type
= type
;
215 bfin_memmap
.nr_map
++;
219 * Sanitize the boot memmap, removing overlaps.
221 static int __init
sanitize_memmap(struct bfin_memmap_entry
*map
, int *pnr_map
)
223 struct change_member
*change_tmp
;
224 unsigned long current_type
, last_type
;
225 unsigned long long last_addr
;
226 int chgidx
, still_changing
;
229 int old_nr
, new_nr
, chg_nr
;
233 Visually we're performing the following (1,2,3,4 = memory types)
235 Sample memory map (w/overlaps):
236 ____22__________________
237 ______________________4_
238 ____1111________________
239 _44_____________________
240 11111111________________
241 ____________________33__
242 ___________44___________
243 __________33333_________
244 ______________22________
245 ___________________2222_
246 _________111111111______
247 _____________________11_
248 _________________4______
250 Sanitized equivalent (no overlap):
251 1_______________________
252 _44_____________________
253 ___1____________________
254 ____22__________________
255 ______11________________
256 _________1______________
257 __________3_____________
258 ___________44___________
259 _____________33_________
260 _______________2________
261 ________________1_______
262 _________________4______
263 ___________________2____
264 ____________________33__
265 ______________________4_
267 /* if there's only one memory region, don't bother */
273 /* bail out if we find any unreasonable addresses in memmap */
274 for (i
= 0; i
< old_nr
; i
++)
275 if (map
[i
].addr
+ map
[i
].size
< map
[i
].addr
)
278 /* create pointers for initial change-point information (for sorting) */
279 for (i
= 0; i
< 2*old_nr
; i
++)
280 change_point
[i
] = &change_point_list
[i
];
282 /* record all known change-points (starting and ending addresses),
283 omitting those that are for empty memory regions */
285 for (i
= 0; i
< old_nr
; i
++) {
286 if (map
[i
].size
!= 0) {
287 change_point
[chgidx
]->addr
= map
[i
].addr
;
288 change_point
[chgidx
++]->pentry
= &map
[i
];
289 change_point
[chgidx
]->addr
= map
[i
].addr
+ map
[i
].size
;
290 change_point
[chgidx
++]->pentry
= &map
[i
];
293 chg_nr
= chgidx
; /* true number of change-points */
295 /* sort change-point list by memory addresses (low -> high) */
297 while (still_changing
) {
299 for (i
= 1; i
< chg_nr
; i
++) {
300 /* if <current_addr> > <last_addr>, swap */
301 /* or, if current=<start_addr> & last=<end_addr>, swap */
302 if ((change_point
[i
]->addr
< change_point
[i
-1]->addr
) ||
303 ((change_point
[i
]->addr
== change_point
[i
-1]->addr
) &&
304 (change_point
[i
]->addr
== change_point
[i
]->pentry
->addr
) &&
305 (change_point
[i
-1]->addr
!= change_point
[i
-1]->pentry
->addr
))
307 change_tmp
= change_point
[i
];
308 change_point
[i
] = change_point
[i
-1];
309 change_point
[i
-1] = change_tmp
;
315 /* create a new memmap, removing overlaps */
316 overlap_entries
= 0; /* number of entries in the overlap table */
317 new_entry
= 0; /* index for creating new memmap entries */
318 last_type
= 0; /* start with undefined memory type */
319 last_addr
= 0; /* start with 0 as last starting address */
320 /* loop through change-points, determining affect on the new memmap */
321 for (chgidx
= 0; chgidx
< chg_nr
; chgidx
++) {
322 /* keep track of all overlapping memmap entries */
323 if (change_point
[chgidx
]->addr
== change_point
[chgidx
]->pentry
->addr
) {
324 /* add map entry to overlap list (> 1 entry implies an overlap) */
325 overlap_list
[overlap_entries
++] = change_point
[chgidx
]->pentry
;
327 /* remove entry from list (order independent, so swap with last) */
328 for (i
= 0; i
< overlap_entries
; i
++) {
329 if (overlap_list
[i
] == change_point
[chgidx
]->pentry
)
330 overlap_list
[i
] = overlap_list
[overlap_entries
-1];
334 /* if there are overlapping entries, decide which "type" to use */
335 /* (larger value takes precedence -- 1=usable, 2,3,4,4+=unusable) */
337 for (i
= 0; i
< overlap_entries
; i
++)
338 if (overlap_list
[i
]->type
> current_type
)
339 current_type
= overlap_list
[i
]->type
;
340 /* continue building up new memmap based on this information */
341 if (current_type
!= last_type
) {
342 if (last_type
!= 0) {
343 new_map
[new_entry
].size
=
344 change_point
[chgidx
]->addr
- last_addr
;
345 /* move forward only if the new size was non-zero */
346 if (new_map
[new_entry
].size
!= 0)
347 if (++new_entry
>= BFIN_MEMMAP_MAX
)
348 break; /* no more space left for new entries */
350 if (current_type
!= 0) {
351 new_map
[new_entry
].addr
= change_point
[chgidx
]->addr
;
352 new_map
[new_entry
].type
= current_type
;
353 last_addr
= change_point
[chgidx
]->addr
;
355 last_type
= current_type
;
358 new_nr
= new_entry
; /* retain count for new entries */
360 /* copy new mapping into original location */
361 memcpy(map
, new_map
, new_nr
*sizeof(struct bfin_memmap_entry
));
367 static void __init
print_memory_map(char *who
)
371 for (i
= 0; i
< bfin_memmap
.nr_map
; i
++) {
372 printk(KERN_DEBUG
" %s: %016Lx - %016Lx ", who
,
373 bfin_memmap
.map
[i
].addr
,
374 bfin_memmap
.map
[i
].addr
+ bfin_memmap
.map
[i
].size
);
375 switch (bfin_memmap
.map
[i
].type
) {
376 case BFIN_MEMMAP_RAM
:
377 printk("(usable)\n");
379 case BFIN_MEMMAP_RESERVED
:
380 printk("(reserved)\n");
382 default: printk("type %lu\n", bfin_memmap
.map
[i
].type
);
388 static __init
int parse_memmap(char *arg
)
390 unsigned long long start_at
, mem_size
;
395 mem_size
= memparse(arg
, &arg
);
397 start_at
= memparse(arg
+1, &arg
);
398 add_memory_region(start_at
, mem_size
, BFIN_MEMMAP_RAM
);
399 } else if (*arg
== '$') {
400 start_at
= memparse(arg
+1, &arg
);
401 add_memory_region(start_at
, mem_size
, BFIN_MEMMAP_RESERVED
);
408 * Initial parsing of the command line. Currently, we support:
409 * - Controlling the linux memory size: mem=xxx[KMG]
410 * - Controlling the physical memory size: max_mem=xxx[KMG][$][#]
411 * $ -> reserved memory is dcacheable
412 * # -> reserved memory is icacheable
413 * - "memmap=XXX[KkmM][@][$]XXX[KkmM]" defines a memory region
414 * @ from <start> to <start>+<mem>, type RAM
415 * $ from <start> to <start>+<mem>, type RESERVED
417 static __init
void parse_cmdline_early(char *cmdline_p
)
419 char c
= ' ', *to
= cmdline_p
;
420 unsigned int memsize
;
423 if (!memcmp(to
, "mem=", 4)) {
425 memsize
= memparse(to
, &to
);
429 } else if (!memcmp(to
, "max_mem=", 8)) {
431 memsize
= memparse(to
, &to
);
433 physical_mem_end
= memsize
;
437 reserved_mem_dcache_on
= 1;
440 reserved_mem_icache_on
= 1;
443 } else if (!memcmp(to
, "clkin_hz=", 9)) {
445 early_init_clkin_hz(to
);
446 } else if (!memcmp(to
, "earlyprintk=", 12)) {
448 setup_early_printk(to
);
449 } else if (!memcmp(to
, "memmap=", 7)) {
461 * Setup memory defaults from user config.
462 * The physical memory layout looks like:
464 * [_rambase, _ramstart]: kernel image
465 * [memory_start, memory_end]: dynamic memory managed by kernel
466 * [memory_end, _ramend]: reserved memory
467 * [memory_mtd_start(memory_end),
468 * memory_mtd_start + mtd_size]: rootfs (if any)
469 * [_ramend - DMA_UNCACHED_REGION,
470 * _ramend]: uncached DMA region
471 * [_ramend, physical_mem_end]: memory not managed by kernel
473 static __init
void memory_setup(void)
475 #ifdef CONFIG_MTD_UCLINUX
476 unsigned long mtd_phys
= 0;
479 _rambase
= (unsigned long)_stext
;
480 _ramstart
= (unsigned long)_end
;
482 if (DMA_UNCACHED_REGION
> (_ramend
- _ramstart
)) {
484 panic("DMA region exceeds memory limit: %lu.",
485 _ramend
- _ramstart
);
487 memory_end
= _ramend
- DMA_UNCACHED_REGION
;
490 /* Round up to multiple of 4MB */
491 memory_start
= (_ramstart
+ 0x3fffff) & ~0x3fffff;
493 memory_start
= PAGE_ALIGN(_ramstart
);
496 #if defined(CONFIG_MTD_UCLINUX)
497 /* generic memory mapped MTD driver */
498 memory_mtd_end
= memory_end
;
500 mtd_phys
= _ramstart
;
501 mtd_size
= PAGE_ALIGN(*((unsigned long *)(mtd_phys
+ 8)));
503 # if defined(CONFIG_EXT2_FS) || defined(CONFIG_EXT3_FS)
504 if (*((unsigned short *)(mtd_phys
+ 0x438)) == EXT2_SUPER_MAGIC
)
506 PAGE_ALIGN(*((unsigned long *)(mtd_phys
+ 0x404)) << 10);
509 # if defined(CONFIG_CRAMFS)
510 if (*((unsigned long *)(mtd_phys
)) == CRAMFS_MAGIC
)
511 mtd_size
= PAGE_ALIGN(*((unsigned long *)(mtd_phys
+ 0x4)));
514 # if defined(CONFIG_ROMFS_FS)
515 if (((unsigned long *)mtd_phys
)[0] == ROMSB_WORD0
516 && ((unsigned long *)mtd_phys
)[1] == ROMSB_WORD1
)
518 PAGE_ALIGN(be32_to_cpu(((unsigned long *)mtd_phys
)[2]));
519 # if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
520 /* Due to a Hardware Anomaly we need to limit the size of usable
521 * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
522 * 05000263 - Hardware loop corrupted when taking an ICPLB exception
524 # if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
525 if (memory_end
>= 56 * 1024 * 1024)
526 memory_end
= 56 * 1024 * 1024;
528 if (memory_end
>= 60 * 1024 * 1024)
529 memory_end
= 60 * 1024 * 1024;
530 # endif /* CONFIG_DEBUG_HUNT_FOR_ZERO */
531 # endif /* ANOMALY_05000263 */
532 # endif /* CONFIG_ROMFS_FS */
534 memory_end
-= mtd_size
;
538 panic("Don't boot kernel without rootfs attached.");
541 /* Relocate MTD image to the top of memory after the uncached memory area */
542 uclinux_ram_map
.phys
= memory_mtd_start
= memory_end
;
543 uclinux_ram_map
.size
= mtd_size
;
544 dma_memcpy((void *)uclinux_ram_map
.phys
, _end
, uclinux_ram_map
.size
);
545 #endif /* CONFIG_MTD_UCLINUX */
547 #if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
548 /* Due to a Hardware Anomaly we need to limit the size of usable
549 * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
550 * 05000263 - Hardware loop corrupted when taking an ICPLB exception
552 #if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
553 if (memory_end
>= 56 * 1024 * 1024)
554 memory_end
= 56 * 1024 * 1024;
556 if (memory_end
>= 60 * 1024 * 1024)
557 memory_end
= 60 * 1024 * 1024;
558 #endif /* CONFIG_DEBUG_HUNT_FOR_ZERO */
559 printk(KERN_NOTICE
"Warning: limiting memory to %liMB due to hardware anomaly 05000263\n", memory_end
>> 20);
560 #endif /* ANOMALY_05000263 */
563 page_mask_nelts
= ((_ramend
>> PAGE_SHIFT
) + 31) / 32;
564 page_mask_order
= get_order(3 * page_mask_nelts
* sizeof(long));
567 #if !defined(CONFIG_MTD_UCLINUX)
568 /*In case there is no valid CPLB behind memory_end make sure we don't get to close*/
569 memory_end
-= SIZE_4K
;
572 init_mm
.start_code
= (unsigned long)_stext
;
573 init_mm
.end_code
= (unsigned long)_etext
;
574 init_mm
.end_data
= (unsigned long)_edata
;
575 init_mm
.brk
= (unsigned long)0;
577 printk(KERN_INFO
"Board Memory: %ldMB\n", physical_mem_end
>> 20);
578 printk(KERN_INFO
"Kernel Managed Memory: %ldMB\n", _ramend
>> 20);
580 printk(KERN_INFO
"Memory map:\n"
581 KERN_INFO
" fixedcode = 0x%p-0x%p\n"
582 KERN_INFO
" text = 0x%p-0x%p\n"
583 KERN_INFO
" rodata = 0x%p-0x%p\n"
584 KERN_INFO
" bss = 0x%p-0x%p\n"
585 KERN_INFO
" data = 0x%p-0x%p\n"
586 KERN_INFO
" stack = 0x%p-0x%p\n"
587 KERN_INFO
" init = 0x%p-0x%p\n"
588 KERN_INFO
" available = 0x%p-0x%p\n"
589 #ifdef CONFIG_MTD_UCLINUX
590 KERN_INFO
" rootfs = 0x%p-0x%p\n"
592 #if DMA_UNCACHED_REGION > 0
593 KERN_INFO
" DMA Zone = 0x%p-0x%p\n"
595 , (void *)FIXED_CODE_START
, (void *)FIXED_CODE_END
,
597 __start_rodata
, __end_rodata
,
598 __bss_start
, __bss_stop
,
600 (void *)&init_thread_union
,
601 (void *)((int)(&init_thread_union
) + 0x2000),
602 __init_begin
, __init_end
,
603 (void *)_ramstart
, (void *)memory_end
604 #ifdef CONFIG_MTD_UCLINUX
605 , (void *)memory_mtd_start
, (void *)(memory_mtd_start
+ mtd_size
)
607 #if DMA_UNCACHED_REGION > 0
608 , (void *)(_ramend
- DMA_UNCACHED_REGION
), (void *)(_ramend
)
614 * Find the lowest, highest page frame number we have available
616 void __init
find_min_max_pfn(void)
621 min_low_pfn
= memory_end
;
623 for (i
= 0; i
< bfin_memmap
.nr_map
; i
++) {
624 unsigned long start
, end
;
626 if (bfin_memmap
.map
[i
].type
!= BFIN_MEMMAP_RAM
)
628 start
= PFN_UP(bfin_memmap
.map
[i
].addr
);
629 end
= PFN_DOWN(bfin_memmap
.map
[i
].addr
+
630 bfin_memmap
.map
[i
].size
);
635 if (start
< min_low_pfn
)
640 static __init
void setup_bootmem_allocator(void)
644 unsigned long start_pfn
, end_pfn
;
645 unsigned long curr_pfn
, last_pfn
, size
;
647 /* mark memory between memory_start and memory_end usable */
648 add_memory_region(memory_start
,
649 memory_end
- memory_start
, BFIN_MEMMAP_RAM
);
650 /* sanity check for overlap */
651 sanitize_memmap(bfin_memmap
.map
, &bfin_memmap
.nr_map
);
652 print_memory_map("boot memmap");
654 /* intialize globals in linux/bootmem.h */
656 /* pfn of the last usable page frame */
657 if (max_pfn
> memory_end
>> PAGE_SHIFT
)
658 max_pfn
= memory_end
>> PAGE_SHIFT
;
659 /* pfn of last page frame directly mapped by kernel */
660 max_low_pfn
= max_pfn
;
661 /* pfn of the first usable page frame after kernel image*/
662 if (min_low_pfn
< memory_start
>> PAGE_SHIFT
)
663 min_low_pfn
= memory_start
>> PAGE_SHIFT
;
665 start_pfn
= PAGE_OFFSET
>> PAGE_SHIFT
;
666 end_pfn
= memory_end
>> PAGE_SHIFT
;
669 * give all the memory to the bootmap allocator, tell it to put the
670 * boot mem_map at the start of memory.
672 bootmap_size
= init_bootmem_node(NODE_DATA(0),
673 memory_start
>> PAGE_SHIFT
, /* map goes here */
676 /* register the memmap regions with the bootmem allocator */
677 for (i
= 0; i
< bfin_memmap
.nr_map
; i
++) {
679 * Reserve usable memory
681 if (bfin_memmap
.map
[i
].type
!= BFIN_MEMMAP_RAM
)
684 * We are rounding up the start address of usable memory:
686 curr_pfn
= PFN_UP(bfin_memmap
.map
[i
].addr
);
687 if (curr_pfn
>= end_pfn
)
690 * ... and at the end of the usable range downwards:
692 last_pfn
= PFN_DOWN(bfin_memmap
.map
[i
].addr
+
693 bfin_memmap
.map
[i
].size
);
695 if (last_pfn
> end_pfn
)
699 * .. finally, did all the rounding and playing
700 * around just make the area go away?
702 if (last_pfn
<= curr_pfn
)
705 size
= last_pfn
- curr_pfn
;
706 free_bootmem(PFN_PHYS(curr_pfn
), PFN_PHYS(size
));
709 /* reserve memory before memory_start, including bootmap */
710 reserve_bootmem(PAGE_OFFSET
,
711 memory_start
+ bootmap_size
+ PAGE_SIZE
- 1 - PAGE_OFFSET
,
715 #define EBSZ_TO_MEG(ebsz) \
718 switch (ebsz & 0xf) { \
719 case 0x1: meg = 16; break; \
720 case 0x3: meg = 32; break; \
721 case 0x5: meg = 64; break; \
722 case 0x7: meg = 128; break; \
723 case 0x9: meg = 256; break; \
724 case 0xb: meg = 512; break; \
728 static inline int __init
get_mem_size(void)
730 #if defined(EBIU_SDBCTL)
731 # if defined(BF561_FAMILY)
733 u32 sdbctl
= bfin_read_EBIU_SDBCTL();
734 ret
+= EBSZ_TO_MEG(sdbctl
>> 0);
735 ret
+= EBSZ_TO_MEG(sdbctl
>> 8);
736 ret
+= EBSZ_TO_MEG(sdbctl
>> 16);
737 ret
+= EBSZ_TO_MEG(sdbctl
>> 24);
740 return EBSZ_TO_MEG(bfin_read_EBIU_SDBCTL());
742 #elif defined(EBIU_DDRCTL1)
743 u32 ddrctl
= bfin_read_EBIU_DDRCTL1();
745 switch (ddrctl
& 0xc0000) {
746 case DEVSZ_64
: ret
= 64 / 8;
747 case DEVSZ_128
: ret
= 128 / 8;
748 case DEVSZ_256
: ret
= 256 / 8;
749 case DEVSZ_512
: ret
= 512 / 8;
751 switch (ddrctl
& 0x30000) {
752 case DEVWD_4
: ret
*= 2;
753 case DEVWD_8
: ret
*= 2;
754 case DEVWD_16
: break;
756 if ((ddrctl
& 0xc000) == 0x4000)
763 void __init
setup_arch(char **cmdline_p
)
765 unsigned long sclk
, cclk
;
767 #ifdef CONFIG_DUMMY_CONSOLE
768 conswitchp
= &dummy_con
;
771 #if defined(CONFIG_CMDLINE_BOOL)
772 strncpy(&command_line
[0], CONFIG_CMDLINE
, sizeof(command_line
));
773 command_line
[sizeof(command_line
) - 1] = 0;
776 /* Keep a copy of command line */
777 *cmdline_p
= &command_line
[0];
778 memcpy(boot_command_line
, command_line
, COMMAND_LINE_SIZE
);
779 boot_command_line
[COMMAND_LINE_SIZE
- 1] = '\0';
781 /* setup memory defaults from the user config */
782 physical_mem_end
= 0;
783 _ramend
= get_mem_size() * 1024 * 1024;
785 memset(&bfin_memmap
, 0, sizeof(bfin_memmap
));
787 parse_cmdline_early(&command_line
[0]);
789 if (physical_mem_end
== 0)
790 physical_mem_end
= _ramend
;
794 /* Initialize Async memory banks */
795 bfin_write_EBIU_AMBCTL0(AMBCTL0VAL
);
796 bfin_write_EBIU_AMBCTL1(AMBCTL1VAL
);
797 bfin_write_EBIU_AMGCTL(AMGCTLVAL
);
798 #ifdef CONFIG_EBIU_MBSCTLVAL
799 bfin_write_EBIU_MBSCTL(CONFIG_EBIU_MBSCTLVAL
);
800 bfin_write_EBIU_MODE(CONFIG_EBIU_MODEVAL
);
801 bfin_write_EBIU_FCTL(CONFIG_EBIU_FCTLVAL
);
807 if ((ANOMALY_05000273
|| ANOMALY_05000274
) && (cclk
>> 1) < sclk
)
808 panic("ANOMALY 05000273 or 05000274: CCLK must be >= 2*SCLK");
811 if (ANOMALY_05000266
) {
812 bfin_read_IMDMA_D0_IRQ_STATUS();
813 bfin_read_IMDMA_D1_IRQ_STATUS();
816 printk(KERN_INFO
"Hardware Trace ");
817 if (bfin_read_TBUFCTL() & 0x1)
821 if (bfin_read_TBUFCTL() & 0x2)
822 printk("and Enabled\n");
824 printk("and Disabled\n");
826 #if defined(CONFIG_CHR_DEV_FLASH) || defined(CONFIG_BLK_DEV_FLASH)
827 /* we need to initialize the Flashrom device here since we might
828 * do things with flash early on in the boot
833 printk(KERN_INFO
"Boot Mode: %i\n", bfin_read_SYSCR() & 0xF);
835 /* Newer parts mirror SWRST bits in SYSCR */
836 #if defined(CONFIG_BF53x) || defined(CONFIG_BF561) || \
837 defined(CONFIG_BF538) || defined(CONFIG_BF539)
838 _bfin_swrst
= bfin_read_SWRST();
840 _bfin_swrst
= bfin_read_SYSCR();
843 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
844 bfin_write_SWRST(_bfin_swrst
& ~DOUBLE_FAULT
);
846 #ifdef CONFIG_DEBUG_DOUBLEFAULT_RESET
847 bfin_write_SWRST(_bfin_swrst
| DOUBLE_FAULT
);
851 if (_bfin_swrst
& SWRST_DBL_FAULT_A
) {
853 if (_bfin_swrst
& RESET_DOUBLE
) {
855 printk(KERN_EMERG
"Recovering from DOUBLE FAULT event\n");
856 #ifdef CONFIG_DEBUG_DOUBLEFAULT
857 /* We assume the crashing kernel, and the current symbol table match */
858 printk(KERN_EMERG
" While handling exception (EXCAUSE = 0x%x) at %pF\n",
859 (int)init_saved_seqstat
& SEQSTAT_EXCAUSE
, init_saved_retx
);
860 printk(KERN_NOTICE
" DCPLB_FAULT_ADDR: %pF\n", init_saved_dcplb_fault_addr
);
861 printk(KERN_NOTICE
" ICPLB_FAULT_ADDR: %pF\n", init_saved_icplb_fault_addr
);
863 printk(KERN_NOTICE
" The instruction at %pF caused a double exception\n",
865 } else if (_bfin_swrst
& RESET_WDOG
)
866 printk(KERN_INFO
"Recovering from Watchdog event\n");
867 else if (_bfin_swrst
& RESET_SOFTWARE
)
868 printk(KERN_NOTICE
"Reset caused by Software reset\n");
870 printk(KERN_INFO
"Blackfin support (C) 2004-2009 Analog Devices, Inc.\n");
871 if (bfin_compiled_revid() == 0xffff)
872 printk(KERN_INFO
"Compiled for ADSP-%s Rev any\n", CPU
);
873 else if (bfin_compiled_revid() == -1)
874 printk(KERN_INFO
"Compiled for ADSP-%s Rev none\n", CPU
);
876 printk(KERN_INFO
"Compiled for ADSP-%s Rev 0.%d\n", CPU
, bfin_compiled_revid());
878 if (unlikely(CPUID
!= bfin_cpuid()))
879 printk(KERN_ERR
"ERROR: Not running on ADSP-%s: unknown CPUID 0x%04x Rev 0.%d\n",
880 CPU
, bfin_cpuid(), bfin_revid());
882 if (bfin_revid() != bfin_compiled_revid()) {
883 if (bfin_compiled_revid() == -1)
884 printk(KERN_ERR
"Warning: Compiled for Rev none, but running on Rev %d\n",
886 else if (bfin_compiled_revid() != 0xffff) {
887 printk(KERN_ERR
"Warning: Compiled for Rev %d, but running on Rev %d\n",
888 bfin_compiled_revid(), bfin_revid());
889 if (bfin_compiled_revid() > bfin_revid())
890 panic("Error: you are missing anomaly workarounds for this rev");
893 if (bfin_revid() < CONFIG_BF_REV_MIN
|| bfin_revid() > CONFIG_BF_REV_MAX
)
894 printk(KERN_ERR
"Warning: Unsupported Chip Revision ADSP-%s Rev 0.%d detected\n",
898 /* We can't run on BF548-0.1 due to ANOMALY 05000448 */
899 if (bfin_cpuid() == 0x27de && bfin_revid() == 1)
900 panic("You can't run on this processor due to 05000448");
902 printk(KERN_INFO
"Blackfin Linux support by http://blackfin.uclinux.org/\n");
904 printk(KERN_INFO
"Processor Speed: %lu MHz core clock and %lu MHz System Clock\n",
905 cclk
/ 1000000, sclk
/ 1000000);
907 setup_bootmem_allocator();
911 /* Copy atomic sequences to their fixed location, and sanity check that
912 these locations are the ones that we advertise to userspace. */
913 memcpy((void *)FIXED_CODE_START
, &fixed_code_start
,
914 FIXED_CODE_END
- FIXED_CODE_START
);
915 BUG_ON((char *)&sigreturn_stub
- (char *)&fixed_code_start
916 != SIGRETURN_STUB
- FIXED_CODE_START
);
917 BUG_ON((char *)&atomic_xchg32
- (char *)&fixed_code_start
918 != ATOMIC_XCHG32
- FIXED_CODE_START
);
919 BUG_ON((char *)&atomic_cas32
- (char *)&fixed_code_start
920 != ATOMIC_CAS32
- FIXED_CODE_START
);
921 BUG_ON((char *)&atomic_add32
- (char *)&fixed_code_start
922 != ATOMIC_ADD32
- FIXED_CODE_START
);
923 BUG_ON((char *)&atomic_sub32
- (char *)&fixed_code_start
924 != ATOMIC_SUB32
- FIXED_CODE_START
);
925 BUG_ON((char *)&atomic_ior32
- (char *)&fixed_code_start
926 != ATOMIC_IOR32
- FIXED_CODE_START
);
927 BUG_ON((char *)&atomic_and32
- (char *)&fixed_code_start
928 != ATOMIC_AND32
- FIXED_CODE_START
);
929 BUG_ON((char *)&atomic_xor32
- (char *)&fixed_code_start
930 != ATOMIC_XOR32
- FIXED_CODE_START
);
931 BUG_ON((char *)&safe_user_instruction
- (char *)&fixed_code_start
932 != SAFE_USER_INSTRUCTION
- FIXED_CODE_START
);
935 platform_init_cpus();
937 init_exception_vectors();
938 bfin_cache_init(); /* Initialize caches for the boot CPU */
941 static int __init
topology_init(void)
944 /* Record CPU-private information for the boot processor. */
945 bfin_setup_cpudata(0);
947 for_each_possible_cpu(cpu
) {
948 register_cpu(&per_cpu(cpu_data
, cpu
).cpu
, cpu
);
954 subsys_initcall(topology_init
);
956 /* Get the input clock frequency */
957 static u_long cached_clkin_hz
= CONFIG_CLKIN_HZ
;
958 static u_long
get_clkin_hz(void)
960 return cached_clkin_hz
;
962 static int __init
early_init_clkin_hz(char *buf
)
964 cached_clkin_hz
= simple_strtoul(buf
, NULL
, 0);
965 #ifdef BFIN_KERNEL_CLOCK
966 if (cached_clkin_hz
!= CONFIG_CLKIN_HZ
)
967 panic("cannot change clkin_hz when reprogramming clocks");
971 early_param("clkin_hz=", early_init_clkin_hz
);
973 /* Get the voltage input multiplier */
974 static u_long
get_vco(void)
976 static u_long cached_vco
;
977 u_long msel
, pll_ctl
;
979 /* The assumption here is that VCO never changes at runtime.
980 * If, someday, we support that, then we'll have to change this.
985 pll_ctl
= bfin_read_PLL_CTL();
986 msel
= (pll_ctl
>> 9) & 0x3F;
990 cached_vco
= get_clkin_hz();
991 cached_vco
>>= (1 & pll_ctl
); /* DF bit */
996 /* Get the Core clock */
997 u_long
get_cclk(void)
999 static u_long cached_cclk_pll_div
, cached_cclk
;
1002 if (bfin_read_PLL_STAT() & 0x1)
1003 return get_clkin_hz();
1005 ssel
= bfin_read_PLL_DIV();
1006 if (ssel
== cached_cclk_pll_div
)
1009 cached_cclk_pll_div
= ssel
;
1011 csel
= ((ssel
>> 4) & 0x03);
1013 if (ssel
&& ssel
< (1 << csel
)) /* SCLK > CCLK */
1014 cached_cclk
= get_vco() / ssel
;
1016 cached_cclk
= get_vco() >> csel
;
1019 EXPORT_SYMBOL(get_cclk
);
1021 /* Get the System clock */
1022 u_long
get_sclk(void)
1024 static u_long cached_sclk
;
1027 /* The assumption here is that SCLK never changes at runtime.
1028 * If, someday, we support that, then we'll have to change this.
1033 if (bfin_read_PLL_STAT() & 0x1)
1034 return get_clkin_hz();
1036 ssel
= bfin_read_PLL_DIV() & 0xf;
1038 printk(KERN_WARNING
"Invalid System Clock\n");
1042 cached_sclk
= get_vco() / ssel
;
1045 EXPORT_SYMBOL(get_sclk
);
1047 unsigned long sclk_to_usecs(unsigned long sclk
)
1049 u64 tmp
= USEC_PER_SEC
* (u64
)sclk
;
1050 do_div(tmp
, get_sclk());
1053 EXPORT_SYMBOL(sclk_to_usecs
);
1055 unsigned long usecs_to_sclk(unsigned long usecs
)
1057 u64 tmp
= get_sclk() * (u64
)usecs
;
1058 do_div(tmp
, USEC_PER_SEC
);
1061 EXPORT_SYMBOL(usecs_to_sclk
);
1064 * Get CPU information for use by the procfs.
1066 static int show_cpuinfo(struct seq_file
*m
, void *v
)
1068 char *cpu
, *mmu
, *fpu
, *vendor
, *cache
;
1070 int cpu_num
= *(unsigned int *)v
;
1072 u_int icache_size
= BFIN_ICACHESIZE
/ 1024, dcache_size
= 0, dsup_banks
= 0;
1073 struct blackfin_cpudata
*cpudata
= &per_cpu(cpu_data
, cpu_num
);
1078 revid
= bfin_revid();
1083 switch (bfin_read_CHIPID() & CHIPID_MANUFACTURE
) {
1085 vendor
= "Analog Devices";
1092 seq_printf(m
, "processor\t: %d\n" "vendor_id\t: %s\n", cpu_num
, vendor
);
1094 if (CPUID
== bfin_cpuid())
1095 seq_printf(m
, "cpu family\t: 0x%04x\n", CPUID
);
1097 seq_printf(m
, "cpu family\t: Compiled for:0x%04x, running on:0x%04x\n",
1098 CPUID
, bfin_cpuid());
1100 seq_printf(m
, "model name\t: ADSP-%s %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n"
1102 cpu
, cclk
/1000000, sclk
/1000000,
1110 if (bfin_revid() != bfin_compiled_revid()) {
1111 if (bfin_compiled_revid() == -1)
1112 seq_printf(m
, "(Compiled for Rev none)");
1113 else if (bfin_compiled_revid() == 0xffff)
1114 seq_printf(m
, "(Compiled for Rev any)");
1116 seq_printf(m
, "(Compiled for Rev %d)", bfin_compiled_revid());
1119 seq_printf(m
, "\ncpu MHz\t\t: %lu.%03lu/%lu.%03lu\n",
1120 cclk
/1000000, cclk
%1000000,
1121 sclk
/1000000, sclk
%1000000);
1122 seq_printf(m
, "bogomips\t: %lu.%02lu\n"
1123 "Calibration\t: %lu loops\n",
1124 (cpudata
->loops_per_jiffy
* HZ
) / 500000,
1125 ((cpudata
->loops_per_jiffy
* HZ
) / 5000) % 100,
1126 (cpudata
->loops_per_jiffy
* HZ
));
1128 /* Check Cache configutation */
1129 switch (cpudata
->dmemctl
& (1 << DMC0_P
| 1 << DMC1_P
)) {
1131 cache
= "dbank-A/B\t: cache/sram";
1136 cache
= "dbank-A/B\t: cache/cache";
1141 cache
= "dbank-A/B\t: sram/sram";
1152 /* Is it turned on? */
1153 if ((cpudata
->dmemctl
& (ENDCPLB
| DMC_ENABLE
)) != (ENDCPLB
| DMC_ENABLE
))
1156 if ((cpudata
->imemctl
& (IMC
| ENICPLB
)) != (IMC
| ENICPLB
))
1159 seq_printf(m
, "cache size\t: %d KB(L1 icache) "
1160 "%d KB(L1 dcache%s) %d KB(L2 cache)\n",
1161 icache_size
, dcache_size
,
1162 #if defined CONFIG_BFIN_WB
1164 #elif defined CONFIG_BFIN_WT
1169 seq_printf(m
, "%s\n", cache
);
1172 seq_printf(m
, "icache setup\t: %d Sub-banks/%d Ways, %d Lines/Way\n",
1173 BFIN_ISUBBANKS
, BFIN_IWAYS
, BFIN_ILINES
);
1175 seq_printf(m
, "icache setup\t: off\n");
1178 "dcache setup\t: %d Super-banks/%d Sub-banks/%d Ways, %d Lines/Way\n",
1179 dsup_banks
, BFIN_DSUBBANKS
, BFIN_DWAYS
,
1181 #ifdef __ARCH_SYNC_CORE_DCACHE
1182 seq_printf(m
, "SMP Dcache Flushes\t: %lu\n\n", cpudata
->dcache_invld_count
);
1184 #ifdef CONFIG_BFIN_ICACHE_LOCK
1185 switch ((cpudata
->imemctl
>> 3) & WAYALL_L
) {
1187 seq_printf(m
, "Way0 Locked-Down\n");
1190 seq_printf(m
, "Way1 Locked-Down\n");
1193 seq_printf(m
, "Way0,Way1 Locked-Down\n");
1196 seq_printf(m
, "Way2 Locked-Down\n");
1199 seq_printf(m
, "Way0,Way2 Locked-Down\n");
1202 seq_printf(m
, "Way1,Way2 Locked-Down\n");
1205 seq_printf(m
, "Way0,Way1 & Way2 Locked-Down\n");
1208 seq_printf(m
, "Way3 Locked-Down\n");
1211 seq_printf(m
, "Way0,Way3 Locked-Down\n");
1214 seq_printf(m
, "Way1,Way3 Locked-Down\n");
1217 seq_printf(m
, "Way 0,Way1,Way3 Locked-Down\n");
1220 seq_printf(m
, "Way3,Way2 Locked-Down\n");
1223 seq_printf(m
, "Way3,Way2,Way0 Locked-Down\n");
1226 seq_printf(m
, "Way3,Way2,Way1 Locked-Down\n");
1229 seq_printf(m
, "All Ways are locked\n");
1232 seq_printf(m
, "No Ways are locked\n");
1236 if (cpu_num
!= num_possible_cpus() - 1)
1240 seq_printf(m
, "L2 SRAM\t\t: %dKB\n", L2_LENGTH
/0x400);
1241 seq_printf(m
, "board name\t: %s\n", bfin_board_name
);
1242 seq_printf(m
, "board memory\t: %ld kB (0x%p -> 0x%p)\n",
1243 physical_mem_end
>> 10, (void *)0, (void *)physical_mem_end
);
1244 seq_printf(m
, "kernel memory\t: %d kB (0x%p -> 0x%p)\n",
1245 ((int)memory_end
- (int)_stext
) >> 10,
1247 (void *)memory_end
);
1248 seq_printf(m
, "\n");
1253 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
1256 *pos
= first_cpu(cpu_online_map
);
1257 if (*pos
>= num_online_cpus())
1263 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
1265 *pos
= next_cpu(*pos
, cpu_online_map
);
1267 return c_start(m
, pos
);
1270 static void c_stop(struct seq_file
*m
, void *v
)
1274 const struct seq_operations cpuinfo_op
= {
1278 .show
= show_cpuinfo
,
1281 void __init
cmdline_init(const char *r0
)
1284 strncpy(command_line
, r0
, COMMAND_LINE_SIZE
);