xref: /openbmc/linux/arch/xtensa/kernel/setup.c (revision aa1f10e8) 
1 /*
2  * arch/xtensa/kernel/setup.c
3  *
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
6  * for more details.
7  *
8  * Copyright (C) 1995  Linus Torvalds
9  * Copyright (C) 2001 - 2005  Tensilica Inc.
10  * Copyright (C) 2014 - 2016  Cadence Design Systems Inc.
11  *
12  * Chris Zankel	<chris@zankel.net>
13  * Joe Taylor	<joe@tensilica.com, joetylr@yahoo.com>
14  * Kevin Chea
15  * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
16  */
17 
18 #include <linux/errno.h>
19 #include <linux/init.h>
20 #include <linux/mm.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>
27 #include <linux/of.h>
28 #include <linux/of_fdt.h>
29 
30 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
31 # include <linux/console.h>
32 #endif
33 
34 #ifdef CONFIG_PROC_FS
35 # include <linux/seq_file.h>
36 #endif
37 
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>
44 #include <asm/page.h>
45 #include <asm/setup.h>
46 #include <asm/param.h>
47 #include <asm/smp.h>
48 #include <asm/sysmem.h>
49 
50 #include <platform/hardware.h>
51 
52 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
53 struct screen_info screen_info = {
54 	.orig_x = 0,
55 	.orig_y = 24,
56 	.orig_video_cols = 80,
57 	.orig_video_lines = 24,
58 	.orig_video_isVGA = 1,
59 	.orig_video_points = 16,
60 };
61 #endif
62 
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;
68 #endif
69 
70 #ifdef CONFIG_OF
71 void *dtb_start = __dtb_start;
72 #endif
73 
74 extern unsigned long loops_per_jiffy;
75 
76 /* Command line specified as configuration option. */
77 
78 static char __initdata command_line[COMMAND_LINE_SIZE];
79 
80 #ifdef CONFIG_CMDLINE_BOOL
81 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
82 #endif
83 
84 /*
85  * Boot parameter parsing.
86  *
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
90  * BP_TAG_LAST tag.
91  */
92 
93 typedef struct tagtable {
94 	u32 tag;
95 	int (*parse)(const bp_tag_t*);
96 } tagtable_t;
97 
98 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn 		\
99 	__attribute__((used, section(".taglist"))) = { tag, fn }
100 
101 /* parse current tag */
102 
103 static int __init parse_tag_mem(const bp_tag_t *tag)
104 {
105 	struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
106 
107 	if (mi->type != MEMORY_TYPE_CONVENTIONAL)
108 		return -1;
109 
110 	return memblock_add(mi->start, mi->end - mi->start);
111 }
112 
113 __tagtable(BP_TAG_MEMORY, parse_tag_mem);
114 
115 #ifdef CONFIG_BLK_DEV_INITRD
116 
117 static int __init parse_tag_initrd(const bp_tag_t* tag)
118 {
119 	struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
120 
121 	initrd_start = (unsigned long)__va(mi->start);
122 	initrd_end = (unsigned long)__va(mi->end);
123 
124 	return 0;
125 }
126 
127 __tagtable(BP_TAG_INITRD, parse_tag_initrd);
128 
129 #endif /* CONFIG_BLK_DEV_INITRD */
130 
131 #ifdef CONFIG_OF
132 
133 static int __init parse_tag_fdt(const bp_tag_t *tag)
134 {
135 	dtb_start = __va(tag->data[0]);
136 	return 0;
137 }
138 
139 __tagtable(BP_TAG_FDT, parse_tag_fdt);
140 
141 #endif /* CONFIG_OF */
142 
143 static int __init parse_tag_cmdline(const bp_tag_t* tag)
144 {
145 	strlcpy(command_line, (char *)(tag->data), COMMAND_LINE_SIZE);
146 	return 0;
147 }
148 
149 __tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
150 
151 static int __init parse_bootparam(const bp_tag_t* tag)
152 {
153 	extern tagtable_t __tagtable_begin, __tagtable_end;
154 	tagtable_t *t;
155 
156 	/* Boot parameters must start with a BP_TAG_FIRST tag. */
157 
158 	if (tag->id != BP_TAG_FIRST) {
159 		printk(KERN_WARNING "Invalid boot parameters!\n");
160 		return 0;
161 	}
162 
163 	tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
164 
165 	/* Parse all tags. */
166 
167 	while (tag != NULL && tag->id != BP_TAG_LAST) {
168 	 	for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
169 			if (tag->id == t->tag) {
170 				t->parse(tag);
171 				break;
172 			}
173 		}
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);
178 	}
179 
180 	return 0;
181 }
182 
183 #ifdef CONFIG_OF
184 
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);
188 
189 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
190 		int depth, void *data)
191 {
192 	const __be32 *ranges;
193 	int len;
194 
195 	if (depth > 1)
196 		return 0;
197 
198 	if (!of_flat_dt_is_compatible(node, "simple-bus"))
199 		return 0;
200 
201 	ranges = of_get_flat_dt_prop(node, "ranges", &len);
202 	if (!ranges)
203 		return 1;
204 	if (len == 0)
205 		return 1;
206 
207 	xtensa_kio_paddr = of_read_ulong(ranges+1, 1);
208 	/* round down to nearest 256MB boundary */
209 	xtensa_kio_paddr &= 0xf0000000;
210 
211 	return 1;
212 }
213 #else
214 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
215 		int depth, void *data)
216 {
217 	return 1;
218 }
219 #endif
220 
221 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
222 {
223 	size &= PAGE_MASK;
224 	memblock_add(base, size);
225 }
226 
227 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
228 {
229 	return __alloc_bootmem(size, align, 0);
230 }
231 
232 void __init early_init_devtree(void *params)
233 {
234 	early_init_dt_scan(params);
235 	of_scan_flat_dt(xtensa_dt_io_area, NULL);
236 
237 	if (!command_line[0])
238 		strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
239 }
240 
241 #endif /* CONFIG_OF */
242 
243 /*
244  * Initialize architecture. (Early stage)
245  */
246 
247 void __init init_arch(bp_tag_t *bp_start)
248 {
249 	/* Parse boot parameters */
250 
251 	if (bp_start)
252 		parse_bootparam(bp_start);
253 
254 #ifdef CONFIG_OF
255 	early_init_devtree(dtb_start);
256 #endif
257 
258 #ifdef CONFIG_CMDLINE_BOOL
259 	if (!command_line[0])
260 		strlcpy(command_line, default_command_line, COMMAND_LINE_SIZE);
261 #endif
262 
263 	/* Early hook for platforms */
264 
265 	platform_init(bp_start);
266 
267 	/* Initialize MMU. */
268 
269 	init_mmu();
270 }
271 
272 /*
273  * Initialize system. Setup memory and reserve regions.
274  */
275 
276 extern char _end[];
277 extern char _stext[];
278 extern char _WindowVectors_text_start;
279 extern char _WindowVectors_text_end;
280 extern char _DebugInterruptVector_literal_start;
281 extern char _DebugInterruptVector_text_end;
282 extern char _KernelExceptionVector_literal_start;
283 extern char _KernelExceptionVector_text_end;
284 extern char _UserExceptionVector_literal_start;
285 extern char _UserExceptionVector_text_end;
286 extern char _DoubleExceptionVector_literal_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;
291 #endif
292 #if XCHAL_EXCM_LEVEL >= 3
293 extern char _Level3InterruptVector_text_start;
294 extern char _Level3InterruptVector_text_end;
295 #endif
296 #if XCHAL_EXCM_LEVEL >= 4
297 extern char _Level4InterruptVector_text_start;
298 extern char _Level4InterruptVector_text_end;
299 #endif
300 #if XCHAL_EXCM_LEVEL >= 5
301 extern char _Level5InterruptVector_text_start;
302 extern char _Level5InterruptVector_text_end;
303 #endif
304 #if XCHAL_EXCM_LEVEL >= 6
305 extern char _Level6InterruptVector_text_start;
306 extern char _Level6InterruptVector_text_end;
307 #endif
308 #ifdef CONFIG_SMP
309 extern char _SecondaryResetVector_text_start;
310 extern char _SecondaryResetVector_text_end;
311 #endif
312 
313 static inline int mem_reserve(unsigned long start, unsigned long end)
314 {
315 	return memblock_reserve(start, end - start);
316 }
317 
318 void __init setup_arch(char **cmdline_p)
319 {
320 	*cmdline_p = command_line;
321 	platform_setup(cmdline_p);
322 	strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
323 
324 	/* Reserve some memory regions */
325 
326 #ifdef CONFIG_BLK_DEV_INITRD
327 	if (initrd_start < initrd_end) {
328 		initrd_is_mapped = mem_reserve(__pa(initrd_start),
329 					       __pa(initrd_end)) == 0;
330 		initrd_below_start_ok = 1;
331 	} else {
332 		initrd_start = 0;
333 	}
334 #endif
335 
336 	mem_reserve(__pa(_stext), __pa(_end));
337 
338 #ifdef CONFIG_VECTORS_OFFSET
339 	mem_reserve(__pa(&_WindowVectors_text_start),
340 		    __pa(&_WindowVectors_text_end));
341 
342 	mem_reserve(__pa(&_DebugInterruptVector_literal_start),
343 		    __pa(&_DebugInterruptVector_text_end));
344 
345 	mem_reserve(__pa(&_KernelExceptionVector_literal_start),
346 		    __pa(&_KernelExceptionVector_text_end));
347 
348 	mem_reserve(__pa(&_UserExceptionVector_literal_start),
349 		    __pa(&_UserExceptionVector_text_end));
350 
351 	mem_reserve(__pa(&_DoubleExceptionVector_literal_start),
352 		    __pa(&_DoubleExceptionVector_text_end));
353 
354 #if XCHAL_EXCM_LEVEL >= 2
355 	mem_reserve(__pa(&_Level2InterruptVector_text_start),
356 		    __pa(&_Level2InterruptVector_text_end));
357 #endif
358 #if XCHAL_EXCM_LEVEL >= 3
359 	mem_reserve(__pa(&_Level3InterruptVector_text_start),
360 		    __pa(&_Level3InterruptVector_text_end));
361 #endif
362 #if XCHAL_EXCM_LEVEL >= 4
363 	mem_reserve(__pa(&_Level4InterruptVector_text_start),
364 		    __pa(&_Level4InterruptVector_text_end));
365 #endif
366 #if XCHAL_EXCM_LEVEL >= 5
367 	mem_reserve(__pa(&_Level5InterruptVector_text_start),
368 		    __pa(&_Level5InterruptVector_text_end));
369 #endif
370 #if XCHAL_EXCM_LEVEL >= 6
371 	mem_reserve(__pa(&_Level6InterruptVector_text_start),
372 		    __pa(&_Level6InterruptVector_text_end));
373 #endif
374 
375 #endif /* CONFIG_VECTORS_OFFSET */
376 
377 #ifdef CONFIG_SMP
378 	mem_reserve(__pa(&_SecondaryResetVector_text_start),
379 		    __pa(&_SecondaryResetVector_text_end));
380 #endif
381 	parse_early_param();
382 	bootmem_init();
383 
384 	unflatten_and_copy_device_tree();
385 
386 #ifdef CONFIG_SMP
387 	smp_init_cpus();
388 #endif
389 
390 	paging_init();
391 	zones_init();
392 
393 #ifdef CONFIG_VT
394 # if defined(CONFIG_VGA_CONSOLE)
395 	conswitchp = &vga_con;
396 # elif defined(CONFIG_DUMMY_CONSOLE)
397 	conswitchp = &dummy_con;
398 # endif
399 #endif
400 
401 #ifdef CONFIG_PCI
402 	platform_pcibios_init();
403 #endif
404 }
405 
406 static DEFINE_PER_CPU(struct cpu, cpu_data);
407 
408 static int __init topology_init(void)
409 {
410 	int i;
411 
412 	for_each_possible_cpu(i) {
413 		struct cpu *cpu = &per_cpu(cpu_data, i);
414 		cpu->hotpluggable = !!i;
415 		register_cpu(cpu, i);
416 	}
417 
418 	return 0;
419 }
420 subsys_initcall(topology_init);
421 
422 void cpu_reset(void)
423 {
424 #if XCHAL_HAVE_PTP_MMU && IS_ENABLED(CONFIG_MMU)
425 	local_irq_disable();
426 	/*
427 	 * We have full MMU: all autoload ways, ways 7, 8 and 9 of DTLB must
428 	 * be flushed.
429 	 * Way 4 is not currently used by linux.
430 	 * Ways 5 and 6 shall not be touched on MMUv2 as they are hardwired.
431 	 * Way 5 shall be flushed and way 6 shall be set to identity mapping
432 	 * on MMUv3.
433 	 */
434 	local_flush_tlb_all();
435 	invalidate_page_directory();
436 #if XCHAL_HAVE_SPANNING_WAY
437 	/* MMU v3 */
438 	{
439 		unsigned long vaddr = (unsigned long)cpu_reset;
440 		unsigned long paddr = __pa(vaddr);
441 		unsigned long tmpaddr = vaddr + SZ_512M;
442 		unsigned long tmp0, tmp1, tmp2, tmp3;
443 
444 		/*
445 		 * Find a place for the temporary mapping. It must not be
446 		 * in the same 512MB region with vaddr or paddr, otherwise
447 		 * there may be multihit exception either on entry to the
448 		 * temporary mapping, or on entry to the identity mapping.
449 		 * (512MB is the biggest page size supported by TLB.)
450 		 */
451 		while (((tmpaddr ^ paddr) & -SZ_512M) == 0)
452 			tmpaddr += SZ_512M;
453 
454 		/* Invalidate mapping in the selected temporary area */
455 		if (itlb_probe(tmpaddr) & BIT(ITLB_HIT_BIT))
456 			invalidate_itlb_entry(itlb_probe(tmpaddr));
457 		if (itlb_probe(tmpaddr + PAGE_SIZE) & BIT(ITLB_HIT_BIT))
458 			invalidate_itlb_entry(itlb_probe(tmpaddr + PAGE_SIZE));
459 
460 		/*
461 		 * Map two consecutive pages starting at the physical address
462 		 * of this function to the temporary mapping area.
463 		 */
464 		write_itlb_entry(__pte((paddr & PAGE_MASK) |
465 				       _PAGE_HW_VALID |
466 				       _PAGE_HW_EXEC |
467 				       _PAGE_CA_BYPASS),
468 				 tmpaddr & PAGE_MASK);
469 		write_itlb_entry(__pte(((paddr & PAGE_MASK) + PAGE_SIZE) |
470 				       _PAGE_HW_VALID |
471 				       _PAGE_HW_EXEC |
472 				       _PAGE_CA_BYPASS),
473 				 (tmpaddr & PAGE_MASK) + PAGE_SIZE);
474 
475 		/* Reinitialize TLB */
476 		__asm__ __volatile__ ("movi	%0, 1f\n\t"
477 				      "movi	%3, 2f\n\t"
478 				      "add	%0, %0, %4\n\t"
479 				      "add	%3, %3, %5\n\t"
480 				      "jx	%0\n"
481 				      /*
482 				       * No literal, data or stack access
483 				       * below this point
484 				       */
485 				      "1:\n\t"
486 				      /* Initialize *tlbcfg */
487 				      "movi	%0, 0\n\t"
488 				      "wsr	%0, itlbcfg\n\t"
489 				      "wsr	%0, dtlbcfg\n\t"
490 				      /* Invalidate TLB way 5 */
491 				      "movi	%0, 4\n\t"
492 				      "movi	%1, 5\n"
493 				      "1:\n\t"
494 				      "iitlb	%1\n\t"
495 				      "idtlb	%1\n\t"
496 				      "add	%1, %1, %6\n\t"
497 				      "addi	%0, %0, -1\n\t"
498 				      "bnez	%0, 1b\n\t"
499 				      /* Initialize TLB way 6 */
500 				      "movi	%0, 7\n\t"
501 				      "addi	%1, %9, 3\n\t"
502 				      "addi	%2, %9, 6\n"
503 				      "1:\n\t"
504 				      "witlb	%1, %2\n\t"
505 				      "wdtlb	%1, %2\n\t"
506 				      "add	%1, %1, %7\n\t"
507 				      "add	%2, %2, %7\n\t"
508 				      "addi	%0, %0, -1\n\t"
509 				      "bnez	%0, 1b\n\t"
510 				      /* Jump to identity mapping */
511 				      "jx	%3\n"
512 				      "2:\n\t"
513 				      /* Complete way 6 initialization */
514 				      "witlb	%1, %2\n\t"
515 				      "wdtlb	%1, %2\n\t"
516 				      /* Invalidate temporary mapping */
517 				      "sub	%0, %9, %7\n\t"
518 				      "iitlb	%0\n\t"
519 				      "add	%0, %0, %8\n\t"
520 				      "iitlb	%0"
521 				      : "=&a"(tmp0), "=&a"(tmp1), "=&a"(tmp2),
522 					"=&a"(tmp3)
523 				      : "a"(tmpaddr - vaddr),
524 					"a"(paddr - vaddr),
525 					"a"(SZ_128M), "a"(SZ_512M),
526 					"a"(PAGE_SIZE),
527 					"a"((tmpaddr + SZ_512M) & PAGE_MASK)
528 				      : "memory");
529 	}
530 #endif
531 #endif
532 	__asm__ __volatile__ ("movi	a2, 0\n\t"
533 			      "wsr	a2, icountlevel\n\t"
534 			      "movi	a2, 0\n\t"
535 			      "wsr	a2, icount\n\t"
536 #if XCHAL_NUM_IBREAK > 0
537 			      "wsr	a2, ibreakenable\n\t"
538 #endif
539 #if XCHAL_HAVE_LOOPS
540 			      "wsr	a2, lcount\n\t"
541 #endif
542 			      "movi	a2, 0x1f\n\t"
543 			      "wsr	a2, ps\n\t"
544 			      "isync\n\t"
545 			      "jx	%0\n\t"
546 			      :
547 			      : "a" (XCHAL_RESET_VECTOR_VADDR)
548 			      : "a2");
549 	for (;;)
550 		;
551 }
552 
553 void machine_restart(char * cmd)
554 {
555 	platform_restart();
556 }
557 
558 void machine_halt(void)
559 {
560 	platform_halt();
561 	while (1);
562 }
563 
564 void machine_power_off(void)
565 {
566 	platform_power_off();
567 	while (1);
568 }
569 #ifdef CONFIG_PROC_FS
570 
571 /*
572  * Display some core information through /proc/cpuinfo.
573  */
574 
575 static int
576 c_show(struct seq_file *f, void *slot)
577 {
578 	/* high-level stuff */
579 	seq_printf(f, "CPU count\t: %u\n"
580 		      "CPU list\t: %*pbl\n"
581 		      "vendor_id\t: Tensilica\n"
582 		      "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n"
583 		      "core ID\t\t: " XCHAL_CORE_ID "\n"
584 		      "build ID\t: 0x%x\n"
585 		      "byte order\t: %s\n"
586 		      "cpu MHz\t\t: %lu.%02lu\n"
587 		      "bogomips\t: %lu.%02lu\n",
588 		      num_online_cpus(),
589 		      cpumask_pr_args(cpu_online_mask),
590 		      XCHAL_BUILD_UNIQUE_ID,
591 		      XCHAL_HAVE_BE ?  "big" : "little",
592 		      ccount_freq/1000000,
593 		      (ccount_freq/10000) % 100,
594 		      loops_per_jiffy/(500000/HZ),
595 		      (loops_per_jiffy/(5000/HZ)) % 100);
596 	seq_puts(f, "flags\t\t: "
597 #if XCHAL_HAVE_NMI
598 		     "nmi "
599 #endif
600 #if XCHAL_HAVE_DEBUG
601 		     "debug "
602 # if XCHAL_HAVE_OCD
603 		     "ocd "
604 # endif
605 #endif
606 #if XCHAL_HAVE_DENSITY
607 	    	     "density "
608 #endif
609 #if XCHAL_HAVE_BOOLEANS
610 		     "boolean "
611 #endif
612 #if XCHAL_HAVE_LOOPS
613 		     "loop "
614 #endif
615 #if XCHAL_HAVE_NSA
616 		     "nsa "
617 #endif
618 #if XCHAL_HAVE_MINMAX
619 		     "minmax "
620 #endif
621 #if XCHAL_HAVE_SEXT
622 		     "sext "
623 #endif
624 #if XCHAL_HAVE_CLAMPS
625 		     "clamps "
626 #endif
627 #if XCHAL_HAVE_MAC16
628 		     "mac16 "
629 #endif
630 #if XCHAL_HAVE_MUL16
631 		     "mul16 "
632 #endif
633 #if XCHAL_HAVE_MUL32
634 		     "mul32 "
635 #endif
636 #if XCHAL_HAVE_MUL32_HIGH
637 		     "mul32h "
638 #endif
639 #if XCHAL_HAVE_FP
640 		     "fpu "
641 #endif
642 #if XCHAL_HAVE_S32C1I
643 		     "s32c1i "
644 #endif
645 		     "\n");
646 
647 	/* Registers. */
648 	seq_printf(f,"physical aregs\t: %d\n"
649 		     "misc regs\t: %d\n"
650 		     "ibreak\t\t: %d\n"
651 		     "dbreak\t\t: %d\n",
652 		     XCHAL_NUM_AREGS,
653 		     XCHAL_NUM_MISC_REGS,
654 		     XCHAL_NUM_IBREAK,
655 		     XCHAL_NUM_DBREAK);
656 
657 
658 	/* Interrupt. */
659 	seq_printf(f,"num ints\t: %d\n"
660 		     "ext ints\t: %d\n"
661 		     "int levels\t: %d\n"
662 		     "timers\t\t: %d\n"
663 		     "debug level\t: %d\n",
664 		     XCHAL_NUM_INTERRUPTS,
665 		     XCHAL_NUM_EXTINTERRUPTS,
666 		     XCHAL_NUM_INTLEVELS,
667 		     XCHAL_NUM_TIMERS,
668 		     XCHAL_DEBUGLEVEL);
669 
670 	/* Cache */
671 	seq_printf(f,"icache line size: %d\n"
672 		     "icache ways\t: %d\n"
673 		     "icache size\t: %d\n"
674 		     "icache flags\t: "
675 #if XCHAL_ICACHE_LINE_LOCKABLE
676 		     "lock "
677 #endif
678 		     "\n"
679 		     "dcache line size: %d\n"
680 		     "dcache ways\t: %d\n"
681 		     "dcache size\t: %d\n"
682 		     "dcache flags\t: "
683 #if XCHAL_DCACHE_IS_WRITEBACK
684 		     "writeback "
685 #endif
686 #if XCHAL_DCACHE_LINE_LOCKABLE
687 		     "lock "
688 #endif
689 		     "\n",
690 		     XCHAL_ICACHE_LINESIZE,
691 		     XCHAL_ICACHE_WAYS,
692 		     XCHAL_ICACHE_SIZE,
693 		     XCHAL_DCACHE_LINESIZE,
694 		     XCHAL_DCACHE_WAYS,
695 		     XCHAL_DCACHE_SIZE);
696 
697 	return 0;
698 }
699 
700 /*
701  * We show only CPU #0 info.
702  */
703 static void *
704 c_start(struct seq_file *f, loff_t *pos)
705 {
706 	return (*pos == 0) ? (void *)1 : NULL;
707 }
708 
709 static void *
710 c_next(struct seq_file *f, void *v, loff_t *pos)
711 {
712 	return NULL;
713 }
714 
715 static void
716 c_stop(struct seq_file *f, void *v)
717 {
718 }
719 
720 const struct seq_operations cpuinfo_op =
721 {
722 	.start	= c_start,
723 	.next	= c_next,
724 	.stop	= c_stop,
725 	.show	= c_show,
726 };
727 
728 #endif /* CONFIG_PROC_FS */
729