2 * arch/xtensa/kernel/setup.c
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
8 * Copyright (C) 1995 Linus Torvalds
9 * Copyright (C) 2001 - 2005 Tensilica Inc.
11 * Chris Zankel <chris@zankel.net>
12 * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
14 * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
17 #include <linux/errno.h>
18 #include <linux/init.h>
20 #include <linux/proc_fs.h>
21 #include <linux/screen_info.h>
22 #include <linux/bootmem.h>
23 #include <linux/kernel.h>
26 #include <linux/of_fdt.h>
27 #include <linux/of_platform.h>
30 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
31 # include <linux/console.h>
35 # include <linux/timex.h>
39 # include <linux/seq_file.h>
42 #include <asm/bootparam.h>
43 #include <asm/pgtable.h>
44 #include <asm/processor.h>
45 #include <asm/timex.h>
46 #include <asm/platform.h>
48 #include <asm/setup.h>
49 #include <asm/param.h>
50 #include <asm/traps.h>
52 #include <platform/hardware.h>
54 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
55 struct screen_info screen_info
= { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16};
58 #ifdef CONFIG_BLK_DEV_FD
59 extern struct fd_ops no_fd_ops
;
60 struct fd_ops
*fd_ops
;
63 extern struct rtc_ops no_rtc_ops
;
64 struct rtc_ops
*rtc_ops
;
66 #ifdef CONFIG_BLK_DEV_INITRD
67 extern void *initrd_start
;
68 extern void *initrd_end
;
69 int initrd_is_mapped
= 0;
70 extern int initrd_below_start_ok
;
74 extern u32 __dtb_start
[];
75 void *dtb_start
= __dtb_start
;
78 unsigned char aux_device_present
;
79 extern unsigned long loops_per_jiffy
;
81 /* Command line specified as configuration option. */
83 static char __initdata command_line
[COMMAND_LINE_SIZE
];
85 #ifdef CONFIG_CMDLINE_BOOL
86 static char default_command_line
[COMMAND_LINE_SIZE
] __initdata
= CONFIG_CMDLINE
;
89 sysmem_info_t __initdata sysmem
;
92 extern void init_mmu(void);
94 static inline void init_mmu(void) { }
97 extern int mem_reserve(unsigned long, unsigned long, int);
98 extern void bootmem_init(void);
99 extern void zones_init(void);
102 * Boot parameter parsing.
104 * The Xtensa port uses a list of variable-sized tags to pass data to
105 * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
106 * to be recognised. The list is terminated with a zero-sized
110 typedef struct tagtable
{
112 int (*parse
)(const bp_tag_t
*);
115 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn \
116 __attribute__((used, section(".taglist"))) = { tag, fn }
118 /* parse current tag */
120 static int __init
add_sysmem_bank(unsigned long type
, unsigned long start
,
123 if (sysmem
.nr_banks
>= SYSMEM_BANKS_MAX
) {
125 "Ignoring memory bank 0x%08lx size %ldKB\n",
129 sysmem
.bank
[sysmem
.nr_banks
].type
= type
;
130 sysmem
.bank
[sysmem
.nr_banks
].start
= PAGE_ALIGN(start
);
131 sysmem
.bank
[sysmem
.nr_banks
].end
= end
& PAGE_MASK
;
137 static int __init
parse_tag_mem(const bp_tag_t
*tag
)
139 meminfo_t
*mi
= (meminfo_t
*)(tag
->data
);
141 if (mi
->type
!= MEMORY_TYPE_CONVENTIONAL
)
144 return add_sysmem_bank(mi
->type
, mi
->start
, mi
->end
);
147 __tagtable(BP_TAG_MEMORY
, parse_tag_mem
);
149 #ifdef CONFIG_BLK_DEV_INITRD
151 static int __init
parse_tag_initrd(const bp_tag_t
* tag
)
154 mi
= (meminfo_t
*)(tag
->data
);
155 initrd_start
= __va(mi
->start
);
156 initrd_end
= __va(mi
->end
);
161 __tagtable(BP_TAG_INITRD
, parse_tag_initrd
);
165 static int __init
parse_tag_fdt(const bp_tag_t
*tag
)
167 dtb_start
= __va(tag
->data
[0]);
171 __tagtable(BP_TAG_FDT
, parse_tag_fdt
);
173 void __init
early_init_dt_setup_initrd_arch(unsigned long start
,
176 initrd_start
= (void *)__va(start
);
177 initrd_end
= (void *)__va(end
);
178 initrd_below_start_ok
= 1;
181 #endif /* CONFIG_OF */
183 #endif /* CONFIG_BLK_DEV_INITRD */
185 static int __init
parse_tag_cmdline(const bp_tag_t
* tag
)
187 strlcpy(command_line
, (char *)(tag
->data
), COMMAND_LINE_SIZE
);
191 __tagtable(BP_TAG_COMMAND_LINE
, parse_tag_cmdline
);
193 static int __init
parse_bootparam(const bp_tag_t
* tag
)
195 extern tagtable_t __tagtable_begin
, __tagtable_end
;
198 /* Boot parameters must start with a BP_TAG_FIRST tag. */
200 if (tag
->id
!= BP_TAG_FIRST
) {
201 printk(KERN_WARNING
"Invalid boot parameters!\n");
205 tag
= (bp_tag_t
*)((unsigned long)tag
+ sizeof(bp_tag_t
) + tag
->size
);
207 /* Parse all tags. */
209 while (tag
!= NULL
&& tag
->id
!= BP_TAG_LAST
) {
210 for (t
= &__tagtable_begin
; t
< &__tagtable_end
; t
++) {
211 if (tag
->id
== t
->tag
) {
216 if (t
== &__tagtable_end
)
217 printk(KERN_WARNING
"Ignoring tag "
218 "0x%08x\n", tag
->id
);
219 tag
= (bp_tag_t
*)((unsigned long)(tag
+ 1) + tag
->size
);
227 void __init
early_init_dt_add_memory_arch(u64 base
, u64 size
)
230 add_sysmem_bank(MEMORY_TYPE_CONVENTIONAL
, base
, base
+ size
);
233 void * __init
early_init_dt_alloc_memory_arch(u64 size
, u64 align
)
235 return __alloc_bootmem(size
, align
, 0);
238 void __init
early_init_devtree(void *params
)
240 /* Setup flat device-tree pointer */
241 initial_boot_params
= params
;
243 /* Retrieve various informations from the /chosen node of the
244 * device-tree, including the platform type, initrd location and
245 * size, TCE reserve, and more ...
247 if (!command_line
[0])
248 of_scan_flat_dt(early_init_dt_scan_chosen
, command_line
);
250 /* Scan memory nodes and rebuild MEMBLOCKs */
251 of_scan_flat_dt(early_init_dt_scan_root
, NULL
);
252 if (sysmem
.nr_banks
== 0)
253 of_scan_flat_dt(early_init_dt_scan_memory
, NULL
);
256 static void __init
copy_devtree(void)
258 void *alloc
= early_init_dt_alloc_memory_arch(
259 be32_to_cpu(initial_boot_params
->totalsize
), 8);
261 memcpy(alloc
, initial_boot_params
,
262 be32_to_cpu(initial_boot_params
->totalsize
));
263 initial_boot_params
= alloc
;
267 static int __init
xtensa_device_probe(void)
269 of_platform_populate(NULL
, NULL
, NULL
, NULL
);
273 device_initcall(xtensa_device_probe
);
275 #endif /* CONFIG_OF */
278 * Initialize architecture. (Early stage)
281 void __init
init_arch(bp_tag_t
*bp_start
)
285 /* Parse boot parameters */
288 parse_bootparam(bp_start
);
291 early_init_devtree(dtb_start
);
294 if (sysmem
.nr_banks
== 0) {
296 sysmem
.bank
[0].start
= PLATFORM_DEFAULT_MEM_START
;
297 sysmem
.bank
[0].end
= PLATFORM_DEFAULT_MEM_START
298 + PLATFORM_DEFAULT_MEM_SIZE
;
301 #ifdef CONFIG_CMDLINE_BOOL
302 if (!command_line
[0])
303 strlcpy(command_line
, default_command_line
, COMMAND_LINE_SIZE
);
306 /* Early hook for platforms */
308 platform_init(bp_start
);
310 /* Initialize MMU. */
316 * Initialize system. Setup memory and reserve regions.
321 extern char _WindowVectors_text_start
;
322 extern char _WindowVectors_text_end
;
323 extern char _DebugInterruptVector_literal_start
;
324 extern char _DebugInterruptVector_text_end
;
325 extern char _KernelExceptionVector_literal_start
;
326 extern char _KernelExceptionVector_text_end
;
327 extern char _UserExceptionVector_literal_start
;
328 extern char _UserExceptionVector_text_end
;
329 extern char _DoubleExceptionVector_literal_start
;
330 extern char _DoubleExceptionVector_text_end
;
331 #if XCHAL_EXCM_LEVEL >= 2
332 extern char _Level2InterruptVector_text_start
;
333 extern char _Level2InterruptVector_text_end
;
335 #if XCHAL_EXCM_LEVEL >= 3
336 extern char _Level3InterruptVector_text_start
;
337 extern char _Level3InterruptVector_text_end
;
339 #if XCHAL_EXCM_LEVEL >= 4
340 extern char _Level4InterruptVector_text_start
;
341 extern char _Level4InterruptVector_text_end
;
343 #if XCHAL_EXCM_LEVEL >= 5
344 extern char _Level5InterruptVector_text_start
;
345 extern char _Level5InterruptVector_text_end
;
347 #if XCHAL_EXCM_LEVEL >= 6
348 extern char _Level6InterruptVector_text_start
;
349 extern char _Level6InterruptVector_text_end
;
354 #ifdef CONFIG_S32C1I_SELFTEST
355 #if XCHAL_HAVE_S32C1I
357 static int __initdata rcw_word
, rcw_probe_pc
, rcw_exc
;
360 * Basic atomic compare-and-swap, that records PC of S32C1I for probing.
362 * If *v == cmp, set *v = set. Return previous *v.
364 static inline int probed_compare_swap(int *v
, int cmp
, int set
)
368 __asm__
__volatile__(
371 " wsr %2, scompare1\n"
372 "1: s32c1i %0, %3, 0\n"
373 : "=a" (set
), "=&a" (tmp
)
374 : "a" (cmp
), "a" (v
), "a" (&rcw_probe_pc
), "0" (set
)
380 /* Handle probed exception */
382 void __init
do_probed_exception(struct pt_regs
*regs
, unsigned long exccause
)
384 if (regs
->pc
== rcw_probe_pc
) { /* exception on s32c1i ? */
385 regs
->pc
+= 3; /* skip the s32c1i instruction */
388 do_unhandled(regs
, exccause
);
392 /* Simple test of S32C1I (soc bringup assist) */
394 void __init
check_s32c1i(void)
396 int n
, cause1
, cause2
;
397 void *handbus
, *handdata
, *handaddr
; /* temporarily saved handlers */
400 handbus
= trap_set_handler(EXCCAUSE_LOAD_STORE_ERROR
,
401 do_probed_exception
);
402 handdata
= trap_set_handler(EXCCAUSE_LOAD_STORE_DATA_ERROR
,
403 do_probed_exception
);
404 handaddr
= trap_set_handler(EXCCAUSE_LOAD_STORE_ADDR_ERROR
,
405 do_probed_exception
);
407 /* First try an S32C1I that does not store: */
410 n
= probed_compare_swap(&rcw_word
, 0, 2);
413 /* took exception? */
415 /* unclean exception? */
416 if (n
!= 2 || rcw_word
!= 1)
417 panic("S32C1I exception error");
418 } else if (rcw_word
!= 1 || n
!= 1) {
419 panic("S32C1I compare error");
422 /* Then an S32C1I that stores: */
424 rcw_word
= 0x1234567;
425 n
= probed_compare_swap(&rcw_word
, 0x1234567, 0xabcde);
429 /* unclean exception? */
430 if (n
!= 0xabcde || rcw_word
!= 0x1234567)
431 panic("S32C1I exception error (b)");
432 } else if (rcw_word
!= 0xabcde || n
!= 0x1234567) {
433 panic("S32C1I store error");
436 /* Verify consistency of exceptions: */
437 if (cause1
|| cause2
) {
438 pr_warn("S32C1I took exception %d, %d\n", cause1
, cause2
);
439 /* If emulation of S32C1I upon bus error gets implemented,
440 we can get rid of this panic for single core (not SMP) */
441 panic("S32C1I exceptions not currently supported");
443 if (cause1
!= cause2
)
444 panic("inconsistent S32C1I exceptions");
446 trap_set_handler(EXCCAUSE_LOAD_STORE_ERROR
, handbus
);
447 trap_set_handler(EXCCAUSE_LOAD_STORE_DATA_ERROR
, handdata
);
448 trap_set_handler(EXCCAUSE_LOAD_STORE_ADDR_ERROR
, handaddr
);
451 #else /* XCHAL_HAVE_S32C1I */
453 /* This condition should not occur with a commercially deployed processor.
454 Display reminder for early engr test or demo chips / FPGA bitstreams */
455 void __init
check_s32c1i(void)
457 pr_warn("Processor configuration lacks atomic compare-and-swap support!\n");
460 #endif /* XCHAL_HAVE_S32C1I */
461 #else /* CONFIG_S32C1I_SELFTEST */
463 void __init
check_s32c1i(void)
467 #endif /* CONFIG_S32C1I_SELFTEST */
470 void __init
setup_arch(char **cmdline_p
)
472 strlcpy(boot_command_line
, command_line
, COMMAND_LINE_SIZE
);
473 *cmdline_p
= command_line
;
477 /* Reserve some memory regions */
479 #ifdef CONFIG_BLK_DEV_INITRD
480 if (initrd_start
< initrd_end
) {
481 initrd_is_mapped
= mem_reserve(__pa(initrd_start
),
482 __pa(initrd_end
), 0);
483 initrd_below_start_ok
= 1;
489 mem_reserve(__pa(&_stext
),__pa(&_end
), 1);
491 mem_reserve(__pa(&_WindowVectors_text_start
),
492 __pa(&_WindowVectors_text_end
), 0);
494 mem_reserve(__pa(&_DebugInterruptVector_literal_start
),
495 __pa(&_DebugInterruptVector_text_end
), 0);
497 mem_reserve(__pa(&_KernelExceptionVector_literal_start
),
498 __pa(&_KernelExceptionVector_text_end
), 0);
500 mem_reserve(__pa(&_UserExceptionVector_literal_start
),
501 __pa(&_UserExceptionVector_text_end
), 0);
503 mem_reserve(__pa(&_DoubleExceptionVector_literal_start
),
504 __pa(&_DoubleExceptionVector_text_end
), 0);
506 #if XCHAL_EXCM_LEVEL >= 2
507 mem_reserve(__pa(&_Level2InterruptVector_text_start
),
508 __pa(&_Level2InterruptVector_text_end
), 0);
510 #if XCHAL_EXCM_LEVEL >= 3
511 mem_reserve(__pa(&_Level3InterruptVector_text_start
),
512 __pa(&_Level3InterruptVector_text_end
), 0);
514 #if XCHAL_EXCM_LEVEL >= 4
515 mem_reserve(__pa(&_Level4InterruptVector_text_start
),
516 __pa(&_Level4InterruptVector_text_end
), 0);
518 #if XCHAL_EXCM_LEVEL >= 5
519 mem_reserve(__pa(&_Level5InterruptVector_text_start
),
520 __pa(&_Level5InterruptVector_text_end
), 0);
522 #if XCHAL_EXCM_LEVEL >= 6
523 mem_reserve(__pa(&_Level6InterruptVector_text_start
),
524 __pa(&_Level6InterruptVector_text_end
), 0);
531 unflatten_device_tree();
534 platform_setup(cmdline_p
);
540 # if defined(CONFIG_VGA_CONSOLE)
541 conswitchp
= &vga_con
;
542 # elif defined(CONFIG_DUMMY_CONSOLE)
543 conswitchp
= &dummy_con
;
548 platform_pcibios_init();
552 void machine_restart(char * cmd
)
557 void machine_halt(void)
563 void machine_power_off(void)
565 platform_power_off();
568 #ifdef CONFIG_PROC_FS
571 * Display some core information through /proc/cpuinfo.
575 c_show(struct seq_file
*f
, void *slot
)
577 /* high-level stuff */
578 seq_printf(f
,"processor\t: 0\n"
579 "vendor_id\t: Tensilica\n"
580 "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME
"\n"
581 "core ID\t\t: " XCHAL_CORE_ID
"\n"
584 "cpu MHz\t\t: %lu.%02lu\n"
585 "bogomips\t: %lu.%02lu\n",
586 XCHAL_BUILD_UNIQUE_ID
,
587 XCHAL_HAVE_BE
? "big" : "little",
588 CCOUNT_PER_JIFFY
/(1000000/HZ
),
589 (CCOUNT_PER_JIFFY
/(10000/HZ
)) % 100,
590 loops_per_jiffy
/(500000/HZ
),
591 (loops_per_jiffy
/(5000/HZ
)) % 100);
593 seq_printf(f
,"flags\t\t: "
603 #if XCHAL_HAVE_DENSITY
606 #if XCHAL_HAVE_BOOLEANS
615 #if XCHAL_HAVE_MINMAX
621 #if XCHAL_HAVE_CLAMPS
633 #if XCHAL_HAVE_MUL32_HIGH
639 #if XCHAL_HAVE_S32C1I
645 seq_printf(f
,"physical aregs\t: %d\n"
656 seq_printf(f
,"num ints\t: %d\n"
660 "debug level\t: %d\n",
661 XCHAL_NUM_INTERRUPTS
,
662 XCHAL_NUM_EXTINTERRUPTS
,
668 seq_printf(f
,"icache line size: %d\n"
669 "icache ways\t: %d\n"
670 "icache size\t: %d\n"
672 #if XCHAL_ICACHE_LINE_LOCKABLE
676 "dcache line size: %d\n"
677 "dcache ways\t: %d\n"
678 "dcache size\t: %d\n"
680 #if XCHAL_DCACHE_IS_WRITEBACK
683 #if XCHAL_DCACHE_LINE_LOCKABLE
687 XCHAL_ICACHE_LINESIZE
,
690 XCHAL_DCACHE_LINESIZE
,
698 * We show only CPU #0 info.
701 c_start(struct seq_file
*f
, loff_t
*pos
)
703 return (void *) ((*pos
== 0) ? (void *)1 : NULL
);
707 c_next(struct seq_file
*f
, void *v
, loff_t
*pos
)
713 c_stop(struct seq_file
*f
, void *v
)
717 const struct seq_operations cpuinfo_op
=
725 #endif /* CONFIG_PROC_FS */