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.
10 * Copyright (C) 2014 - 2016 Cadence Design Systems Inc.
12 * Chris Zankel <chris@zankel.net>
13 * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
15 * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
18 #include <linux/errno.h>
19 #include <linux/init.h>
21 #include <linux/proc_fs.h>
22 #include <linux/screen_info.h>
23 #include <linux/bootmem.h>
24 #include <linux/kernel.h>
25 #include <linux/percpu.h>
26 #include <linux/cpu.h>
28 #include <linux/of_fdt.h>
30 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
31 # include <linux/console.h>
35 # include <linux/seq_file.h>
38 #include <asm/bootparam.h>
39 #include <asm/mmu_context.h>
40 #include <asm/pgtable.h>
41 #include <asm/processor.h>
42 #include <asm/timex.h>
43 #include <asm/platform.h>
45 #include <asm/setup.h>
46 #include <asm/param.h>
48 #include <asm/sysmem.h>
50 #include <platform/hardware.h>
52 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
53 struct screen_info screen_info
= {
56 .orig_video_cols
= 80,
57 .orig_video_lines
= 24,
58 .orig_video_isVGA
= 1,
59 .orig_video_points
= 16,
63 #ifdef CONFIG_BLK_DEV_INITRD
64 extern unsigned long initrd_start
;
65 extern unsigned long initrd_end
;
66 int initrd_is_mapped
= 0;
67 extern int initrd_below_start_ok
;
71 void *dtb_start
= __dtb_start
;
74 extern unsigned long loops_per_jiffy
;
76 /* Command line specified as configuration option. */
78 static char __initdata command_line
[COMMAND_LINE_SIZE
];
80 #ifdef CONFIG_CMDLINE_BOOL
81 static char default_command_line
[COMMAND_LINE_SIZE
] __initdata
= CONFIG_CMDLINE
;
85 * Boot parameter parsing.
87 * The Xtensa port uses a list of variable-sized tags to pass data to
88 * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
89 * to be recognised. The list is terminated with a zero-sized
93 typedef struct tagtable
{
95 int (*parse
)(const bp_tag_t
*);
98 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn \
99 __attribute__((used, section(".taglist"))) = { tag, fn }
101 /* parse current tag */
103 static int __init
parse_tag_mem(const bp_tag_t
*tag
)
105 struct bp_meminfo
*mi
= (struct bp_meminfo
*)(tag
->data
);
107 if (mi
->type
!= MEMORY_TYPE_CONVENTIONAL
)
110 return memblock_add(mi
->start
, mi
->end
- mi
->start
);
113 __tagtable(BP_TAG_MEMORY
, parse_tag_mem
);
115 #ifdef CONFIG_BLK_DEV_INITRD
117 static int __init
parse_tag_initrd(const bp_tag_t
* tag
)
119 struct bp_meminfo
*mi
= (struct bp_meminfo
*)(tag
->data
);
121 initrd_start
= (unsigned long)__va(mi
->start
);
122 initrd_end
= (unsigned long)__va(mi
->end
);
127 __tagtable(BP_TAG_INITRD
, parse_tag_initrd
);
129 #endif /* CONFIG_BLK_DEV_INITRD */
133 static int __init
parse_tag_fdt(const bp_tag_t
*tag
)
135 dtb_start
= __va(tag
->data
[0]);
139 __tagtable(BP_TAG_FDT
, parse_tag_fdt
);
141 #endif /* CONFIG_OF */
143 static int __init
parse_tag_cmdline(const bp_tag_t
* tag
)
145 strlcpy(command_line
, (char *)(tag
->data
), COMMAND_LINE_SIZE
);
149 __tagtable(BP_TAG_COMMAND_LINE
, parse_tag_cmdline
);
151 static int __init
parse_bootparam(const bp_tag_t
* tag
)
153 extern tagtable_t __tagtable_begin
, __tagtable_end
;
156 /* Boot parameters must start with a BP_TAG_FIRST tag. */
158 if (tag
->id
!= BP_TAG_FIRST
) {
159 printk(KERN_WARNING
"Invalid boot parameters!\n");
163 tag
= (bp_tag_t
*)((unsigned long)tag
+ sizeof(bp_tag_t
) + tag
->size
);
165 /* Parse all tags. */
167 while (tag
!= NULL
&& tag
->id
!= BP_TAG_LAST
) {
168 for (t
= &__tagtable_begin
; t
< &__tagtable_end
; t
++) {
169 if (tag
->id
== t
->tag
) {
174 if (t
== &__tagtable_end
)
175 printk(KERN_WARNING
"Ignoring tag "
176 "0x%08x\n", tag
->id
);
177 tag
= (bp_tag_t
*)((unsigned long)(tag
+ 1) + tag
->size
);
185 #if !XCHAL_HAVE_PTP_MMU || XCHAL_HAVE_SPANNING_WAY
186 unsigned long xtensa_kio_paddr
= XCHAL_KIO_DEFAULT_PADDR
;
187 EXPORT_SYMBOL(xtensa_kio_paddr
);
189 static int __init
xtensa_dt_io_area(unsigned long node
, const char *uname
,
190 int depth
, void *data
)
192 const __be32
*ranges
;
198 if (!of_flat_dt_is_compatible(node
, "simple-bus"))
201 ranges
= of_get_flat_dt_prop(node
, "ranges", &len
);
207 xtensa_kio_paddr
= of_read_ulong(ranges
+1, 1);
208 /* round down to nearest 256MB boundary */
209 xtensa_kio_paddr
&= 0xf0000000;
214 static int __init
xtensa_dt_io_area(unsigned long node
, const char *uname
,
215 int depth
, void *data
)
221 void __init
early_init_dt_add_memory_arch(u64 base
, u64 size
)
224 memblock_add(base
, size
);
227 void * __init
early_init_dt_alloc_memory_arch(u64 size
, u64 align
)
229 return __alloc_bootmem(size
, align
, 0);
232 void __init
early_init_devtree(void *params
)
234 early_init_dt_scan(params
);
235 of_scan_flat_dt(xtensa_dt_io_area
, NULL
);
237 if (!command_line
[0])
238 strlcpy(command_line
, boot_command_line
, COMMAND_LINE_SIZE
);
241 #endif /* CONFIG_OF */
244 * Initialize architecture. (Early stage)
247 void __init
init_arch(bp_tag_t
*bp_start
)
249 /* Parse boot parameters */
252 parse_bootparam(bp_start
);
255 early_init_devtree(dtb_start
);
258 #ifdef CONFIG_CMDLINE_BOOL
259 if (!command_line
[0])
260 strlcpy(command_line
, default_command_line
, COMMAND_LINE_SIZE
);
263 /* Early hook for platforms */
265 platform_init(bp_start
);
267 /* Initialize MMU. */
273 * Initialize system. Setup memory and reserve regions.
277 extern char _stext
[];
278 extern char _WindowVectors_text_start
;
279 extern char _WindowVectors_text_end
;
280 extern char _DebugInterruptVector_text_start
;
281 extern char _DebugInterruptVector_text_end
;
282 extern char _KernelExceptionVector_text_start
;
283 extern char _KernelExceptionVector_text_end
;
284 extern char _UserExceptionVector_text_start
;
285 extern char _UserExceptionVector_text_end
;
286 extern char _DoubleExceptionVector_text_start
;
287 extern char _DoubleExceptionVector_text_end
;
288 #if XCHAL_EXCM_LEVEL >= 2
289 extern char _Level2InterruptVector_text_start
;
290 extern char _Level2InterruptVector_text_end
;
292 #if XCHAL_EXCM_LEVEL >= 3
293 extern char _Level3InterruptVector_text_start
;
294 extern char _Level3InterruptVector_text_end
;
296 #if XCHAL_EXCM_LEVEL >= 4
297 extern char _Level4InterruptVector_text_start
;
298 extern char _Level4InterruptVector_text_end
;
300 #if XCHAL_EXCM_LEVEL >= 5
301 extern char _Level5InterruptVector_text_start
;
302 extern char _Level5InterruptVector_text_end
;
304 #if XCHAL_EXCM_LEVEL >= 6
305 extern char _Level6InterruptVector_text_start
;
306 extern char _Level6InterruptVector_text_end
;
309 extern char _SecondaryResetVector_text_start
;
310 extern char _SecondaryResetVector_text_end
;
313 static inline int mem_reserve(unsigned long start
, unsigned long end
)
315 return memblock_reserve(start
, end
- start
);
318 void __init
setup_arch(char **cmdline_p
)
320 pr_info("config ID: %08x:%08x\n",
321 get_sr(SREG_EPC
), get_sr(SREG_EXCSAVE
));
322 if (get_sr(SREG_EPC
) != XCHAL_HW_CONFIGID0
||
323 get_sr(SREG_EXCSAVE
) != XCHAL_HW_CONFIGID1
)
324 pr_info("built for config ID: %08x:%08x\n",
325 XCHAL_HW_CONFIGID0
, XCHAL_HW_CONFIGID1
);
327 *cmdline_p
= command_line
;
328 platform_setup(cmdline_p
);
329 strlcpy(boot_command_line
, *cmdline_p
, COMMAND_LINE_SIZE
);
331 /* Reserve some memory regions */
333 #ifdef CONFIG_BLK_DEV_INITRD
334 if (initrd_start
< initrd_end
) {
335 initrd_is_mapped
= mem_reserve(__pa(initrd_start
),
336 __pa(initrd_end
)) == 0;
337 initrd_below_start_ok
= 1;
343 mem_reserve(__pa(_stext
), __pa(_end
));
345 #ifdef CONFIG_VECTORS_OFFSET
346 mem_reserve(__pa(&_WindowVectors_text_start
),
347 __pa(&_WindowVectors_text_end
));
349 mem_reserve(__pa(&_DebugInterruptVector_text_start
),
350 __pa(&_DebugInterruptVector_text_end
));
352 mem_reserve(__pa(&_KernelExceptionVector_text_start
),
353 __pa(&_KernelExceptionVector_text_end
));
355 mem_reserve(__pa(&_UserExceptionVector_text_start
),
356 __pa(&_UserExceptionVector_text_end
));
358 mem_reserve(__pa(&_DoubleExceptionVector_text_start
),
359 __pa(&_DoubleExceptionVector_text_end
));
361 #if XCHAL_EXCM_LEVEL >= 2
362 mem_reserve(__pa(&_Level2InterruptVector_text_start
),
363 __pa(&_Level2InterruptVector_text_end
));
365 #if XCHAL_EXCM_LEVEL >= 3
366 mem_reserve(__pa(&_Level3InterruptVector_text_start
),
367 __pa(&_Level3InterruptVector_text_end
));
369 #if XCHAL_EXCM_LEVEL >= 4
370 mem_reserve(__pa(&_Level4InterruptVector_text_start
),
371 __pa(&_Level4InterruptVector_text_end
));
373 #if XCHAL_EXCM_LEVEL >= 5
374 mem_reserve(__pa(&_Level5InterruptVector_text_start
),
375 __pa(&_Level5InterruptVector_text_end
));
377 #if XCHAL_EXCM_LEVEL >= 6
378 mem_reserve(__pa(&_Level6InterruptVector_text_start
),
379 __pa(&_Level6InterruptVector_text_end
));
382 #endif /* CONFIG_VECTORS_OFFSET */
385 mem_reserve(__pa(&_SecondaryResetVector_text_start
),
386 __pa(&_SecondaryResetVector_text_end
));
391 unflatten_and_copy_device_tree();
401 # if defined(CONFIG_VGA_CONSOLE)
402 conswitchp
= &vga_con
;
403 # elif defined(CONFIG_DUMMY_CONSOLE)
404 conswitchp
= &dummy_con
;
409 platform_pcibios_init();
413 static DEFINE_PER_CPU(struct cpu
, cpu_data
);
415 static int __init
topology_init(void)
419 for_each_possible_cpu(i
) {
420 struct cpu
*cpu
= &per_cpu(cpu_data
, i
);
421 cpu
->hotpluggable
= !!i
;
422 register_cpu(cpu
, i
);
427 subsys_initcall(topology_init
);
431 #if XCHAL_HAVE_PTP_MMU && IS_ENABLED(CONFIG_MMU)
434 * We have full MMU: all autoload ways, ways 7, 8 and 9 of DTLB must
436 * Way 4 is not currently used by linux.
437 * Ways 5 and 6 shall not be touched on MMUv2 as they are hardwired.
438 * Way 5 shall be flushed and way 6 shall be set to identity mapping
441 local_flush_tlb_all();
442 invalidate_page_directory();
443 #if XCHAL_HAVE_SPANNING_WAY
446 unsigned long vaddr
= (unsigned long)cpu_reset
;
447 unsigned long paddr
= __pa(vaddr
);
448 unsigned long tmpaddr
= vaddr
+ SZ_512M
;
449 unsigned long tmp0
, tmp1
, tmp2
, tmp3
;
452 * Find a place for the temporary mapping. It must not be
453 * in the same 512MB region with vaddr or paddr, otherwise
454 * there may be multihit exception either on entry to the
455 * temporary mapping, or on entry to the identity mapping.
456 * (512MB is the biggest page size supported by TLB.)
458 while (((tmpaddr
^ paddr
) & -SZ_512M
) == 0)
461 /* Invalidate mapping in the selected temporary area */
462 if (itlb_probe(tmpaddr
) & BIT(ITLB_HIT_BIT
))
463 invalidate_itlb_entry(itlb_probe(tmpaddr
));
464 if (itlb_probe(tmpaddr
+ PAGE_SIZE
) & BIT(ITLB_HIT_BIT
))
465 invalidate_itlb_entry(itlb_probe(tmpaddr
+ PAGE_SIZE
));
468 * Map two consecutive pages starting at the physical address
469 * of this function to the temporary mapping area.
471 write_itlb_entry(__pte((paddr
& PAGE_MASK
) |
475 tmpaddr
& PAGE_MASK
);
476 write_itlb_entry(__pte(((paddr
& PAGE_MASK
) + PAGE_SIZE
) |
480 (tmpaddr
& PAGE_MASK
) + PAGE_SIZE
);
482 /* Reinitialize TLB */
483 __asm__
__volatile__ ("movi %0, 1f\n\t"
489 * No literal, data or stack access
493 /* Initialize *tlbcfg */
495 "wsr %0, itlbcfg\n\t"
496 "wsr %0, dtlbcfg\n\t"
497 /* Invalidate TLB way 5 */
504 "addi %0, %0, -1\n\t"
506 /* Initialize TLB way 6 */
515 "addi %0, %0, -1\n\t"
517 /* Jump to identity mapping */
520 /* Complete way 6 initialization */
523 /* Invalidate temporary mapping */
528 : "=&a"(tmp0
), "=&a"(tmp1
), "=&a"(tmp2
),
530 : "a"(tmpaddr
- vaddr
),
532 "a"(SZ_128M
), "a"(SZ_512M
),
534 "a"((tmpaddr
+ SZ_512M
) & PAGE_MASK
)
539 __asm__
__volatile__ ("movi a2, 0\n\t"
540 "wsr a2, icountlevel\n\t"
543 #if XCHAL_NUM_IBREAK > 0
544 "wsr a2, ibreakenable\n\t"
554 : "a" (XCHAL_RESET_VECTOR_VADDR
)
560 void machine_restart(char * cmd
)
565 void machine_halt(void)
571 void machine_power_off(void)
573 platform_power_off();
576 #ifdef CONFIG_PROC_FS
579 * Display some core information through /proc/cpuinfo.
583 c_show(struct seq_file
*f
, void *slot
)
585 /* high-level stuff */
586 seq_printf(f
, "CPU count\t: %u\n"
587 "CPU list\t: %*pbl\n"
588 "vendor_id\t: Tensilica\n"
589 "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME
"\n"
590 "core ID\t\t: " XCHAL_CORE_ID
"\n"
592 "config ID\t: %08x:%08x\n"
594 "cpu MHz\t\t: %lu.%02lu\n"
595 "bogomips\t: %lu.%02lu\n",
597 cpumask_pr_args(cpu_online_mask
),
598 XCHAL_BUILD_UNIQUE_ID
,
599 get_sr(SREG_EPC
), get_sr(SREG_EXCSAVE
),
600 XCHAL_HAVE_BE
? "big" : "little",
602 (ccount_freq
/10000) % 100,
603 loops_per_jiffy
/(500000/HZ
),
604 (loops_per_jiffy
/(5000/HZ
)) % 100);
605 seq_puts(f
, "flags\t\t: "
615 #if XCHAL_HAVE_DENSITY
618 #if XCHAL_HAVE_BOOLEANS
627 #if XCHAL_HAVE_MINMAX
633 #if XCHAL_HAVE_CLAMPS
645 #if XCHAL_HAVE_MUL32_HIGH
651 #if XCHAL_HAVE_S32C1I
657 seq_printf(f
,"physical aregs\t: %d\n"
668 seq_printf(f
,"num ints\t: %d\n"
672 "debug level\t: %d\n",
673 XCHAL_NUM_INTERRUPTS
,
674 XCHAL_NUM_EXTINTERRUPTS
,
680 seq_printf(f
,"icache line size: %d\n"
681 "icache ways\t: %d\n"
682 "icache size\t: %d\n"
684 #if XCHAL_ICACHE_LINE_LOCKABLE
688 "dcache line size: %d\n"
689 "dcache ways\t: %d\n"
690 "dcache size\t: %d\n"
692 #if XCHAL_DCACHE_IS_WRITEBACK
695 #if XCHAL_DCACHE_LINE_LOCKABLE
699 XCHAL_ICACHE_LINESIZE
,
702 XCHAL_DCACHE_LINESIZE
,
710 * We show only CPU #0 info.
713 c_start(struct seq_file
*f
, loff_t
*pos
)
715 return (*pos
== 0) ? (void *)1 : NULL
;
719 c_next(struct seq_file
*f
, void *v
, loff_t
*pos
)
725 c_stop(struct seq_file
*f
, void *v
)
729 const struct seq_operations cpuinfo_op
=
737 #endif /* CONFIG_PROC_FS */