xref: /openbmc/linux/arch/xtensa/kernel/setup.c (revision a06c488d) 
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  *
11  * Chris Zankel	<chris@zankel.net>
12  * Joe Taylor	<joe@tensilica.com, joetylr@yahoo.com>
13  * Kevin Chea
14  * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
15  */
16 
17 #include <linux/errno.h>
18 #include <linux/init.h>
19 #include <linux/mm.h>
20 #include <linux/proc_fs.h>
21 #include <linux/screen_info.h>
22 #include <linux/bootmem.h>
23 #include <linux/kernel.h>
24 #include <linux/percpu.h>
25 #include <linux/clk-provider.h>
26 #include <linux/cpu.h>
27 #include <linux/of_fdt.h>
28 #include <linux/of_platform.h>
29 
30 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
31 # include <linux/console.h>
32 #endif
33 
34 #ifdef CONFIG_RTC
35 # include <linux/timex.h>
36 #endif
37 
38 #ifdef CONFIG_PROC_FS
39 # include <linux/seq_file.h>
40 #endif
41 
42 #include <asm/bootparam.h>
43 #include <asm/mmu_context.h>
44 #include <asm/pgtable.h>
45 #include <asm/processor.h>
46 #include <asm/timex.h>
47 #include <asm/platform.h>
48 #include <asm/page.h>
49 #include <asm/setup.h>
50 #include <asm/param.h>
51 #include <asm/traps.h>
52 #include <asm/smp.h>
53 #include <asm/sysmem.h>
54 
55 #include <platform/hardware.h>
56 
57 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
58 struct screen_info screen_info = { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16};
59 #endif
60 
61 #ifdef CONFIG_BLK_DEV_FD
62 extern struct fd_ops no_fd_ops;
63 struct fd_ops *fd_ops;
64 #endif
65 
66 extern struct rtc_ops no_rtc_ops;
67 struct rtc_ops *rtc_ops;
68 
69 #ifdef CONFIG_BLK_DEV_INITRD
70 extern unsigned long initrd_start;
71 extern unsigned long initrd_end;
72 int initrd_is_mapped = 0;
73 extern int initrd_below_start_ok;
74 #endif
75 
76 #ifdef CONFIG_OF
77 void *dtb_start = __dtb_start;
78 #endif
79 
80 unsigned char aux_device_present;
81 extern unsigned long loops_per_jiffy;
82 
83 /* Command line specified as configuration option. */
84 
85 static char __initdata command_line[COMMAND_LINE_SIZE];
86 
87 #ifdef CONFIG_CMDLINE_BOOL
88 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
89 #endif
90 
91 /*
92  * Boot parameter parsing.
93  *
94  * The Xtensa port uses a list of variable-sized tags to pass data to
95  * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
96  * to be recognised. The list is terminated with a zero-sized
97  * BP_TAG_LAST tag.
98  */
99 
100 typedef struct tagtable {
101 	u32 tag;
102 	int (*parse)(const bp_tag_t*);
103 } tagtable_t;
104 
105 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn 		\
106 	__attribute__((used, section(".taglist"))) = { tag, fn }
107 
108 /* parse current tag */
109 
110 static int __init parse_tag_mem(const bp_tag_t *tag)
111 {
112 	struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
113 
114 	if (mi->type != MEMORY_TYPE_CONVENTIONAL)
115 		return -1;
116 
117 	return add_sysmem_bank(mi->start, mi->end);
118 }
119 
120 __tagtable(BP_TAG_MEMORY, parse_tag_mem);
121 
122 #ifdef CONFIG_BLK_DEV_INITRD
123 
124 static int __init parse_tag_initrd(const bp_tag_t* tag)
125 {
126 	struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
127 
128 	initrd_start = (unsigned long)__va(mi->start);
129 	initrd_end = (unsigned long)__va(mi->end);
130 
131 	return 0;
132 }
133 
134 __tagtable(BP_TAG_INITRD, parse_tag_initrd);
135 
136 #ifdef CONFIG_OF
137 
138 static int __init parse_tag_fdt(const bp_tag_t *tag)
139 {
140 	dtb_start = __va(tag->data[0]);
141 	return 0;
142 }
143 
144 __tagtable(BP_TAG_FDT, parse_tag_fdt);
145 
146 #endif /* CONFIG_OF */
147 
148 #endif /* CONFIG_BLK_DEV_INITRD */
149 
150 static int __init parse_tag_cmdline(const bp_tag_t* tag)
151 {
152 	strlcpy(command_line, (char *)(tag->data), COMMAND_LINE_SIZE);
153 	return 0;
154 }
155 
156 __tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
157 
158 static int __init parse_bootparam(const bp_tag_t* tag)
159 {
160 	extern tagtable_t __tagtable_begin, __tagtable_end;
161 	tagtable_t *t;
162 
163 	/* Boot parameters must start with a BP_TAG_FIRST tag. */
164 
165 	if (tag->id != BP_TAG_FIRST) {
166 		printk(KERN_WARNING "Invalid boot parameters!\n");
167 		return 0;
168 	}
169 
170 	tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
171 
172 	/* Parse all tags. */
173 
174 	while (tag != NULL && tag->id != BP_TAG_LAST) {
175 	 	for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
176 			if (tag->id == t->tag) {
177 				t->parse(tag);
178 				break;
179 			}
180 		}
181 		if (t == &__tagtable_end)
182 			printk(KERN_WARNING "Ignoring tag "
183 			       "0x%08x\n", tag->id);
184 		tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
185 	}
186 
187 	return 0;
188 }
189 
190 #ifdef CONFIG_OF
191 bool __initdata dt_memory_scan = false;
192 
193 #if !XCHAL_HAVE_PTP_MMU || XCHAL_HAVE_SPANNING_WAY
194 unsigned long xtensa_kio_paddr = XCHAL_KIO_DEFAULT_PADDR;
195 EXPORT_SYMBOL(xtensa_kio_paddr);
196 
197 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
198 		int depth, void *data)
199 {
200 	const __be32 *ranges;
201 	int len;
202 
203 	if (depth > 1)
204 		return 0;
205 
206 	if (!of_flat_dt_is_compatible(node, "simple-bus"))
207 		return 0;
208 
209 	ranges = of_get_flat_dt_prop(node, "ranges", &len);
210 	if (!ranges)
211 		return 1;
212 	if (len == 0)
213 		return 1;
214 
215 	xtensa_kio_paddr = of_read_ulong(ranges+1, 1);
216 	/* round down to nearest 256MB boundary */
217 	xtensa_kio_paddr &= 0xf0000000;
218 
219 	return 1;
220 }
221 #else
222 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
223 		int depth, void *data)
224 {
225 	return 1;
226 }
227 #endif
228 
229 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
230 {
231 	if (!dt_memory_scan)
232 		return;
233 
234 	size &= PAGE_MASK;
235 	add_sysmem_bank(base, base + size);
236 }
237 
238 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
239 {
240 	return __alloc_bootmem(size, align, 0);
241 }
242 
243 void __init early_init_devtree(void *params)
244 {
245 	if (sysmem.nr_banks == 0)
246 		dt_memory_scan = true;
247 
248 	early_init_dt_scan(params);
249 	of_scan_flat_dt(xtensa_dt_io_area, NULL);
250 
251 	if (!command_line[0])
252 		strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
253 }
254 
255 static int __init xtensa_device_probe(void)
256 {
257 	of_clk_init(NULL);
258 	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
259 	return 0;
260 }
261 
262 device_initcall(xtensa_device_probe);
263 
264 #endif /* CONFIG_OF */
265 
266 /*
267  * Initialize architecture. (Early stage)
268  */
269 
270 void __init init_arch(bp_tag_t *bp_start)
271 {
272 	/* Parse boot parameters */
273 
274 	if (bp_start)
275 		parse_bootparam(bp_start);
276 
277 #ifdef CONFIG_OF
278 	early_init_devtree(dtb_start);
279 #endif
280 
281 	if (sysmem.nr_banks == 0) {
282 		add_sysmem_bank(PLATFORM_DEFAULT_MEM_START,
283 				PLATFORM_DEFAULT_MEM_START +
284 				PLATFORM_DEFAULT_MEM_SIZE);
285 	}
286 
287 #ifdef CONFIG_CMDLINE_BOOL
288 	if (!command_line[0])
289 		strlcpy(command_line, default_command_line, COMMAND_LINE_SIZE);
290 #endif
291 
292 	/* Early hook for platforms */
293 
294 	platform_init(bp_start);
295 
296 	/* Initialize MMU. */
297 
298 	init_mmu();
299 }
300 
301 /*
302  * Initialize system. Setup memory and reserve regions.
303  */
304 
305 extern char _end;
306 extern char _stext;
307 extern char _WindowVectors_text_start;
308 extern char _WindowVectors_text_end;
309 extern char _DebugInterruptVector_literal_start;
310 extern char _DebugInterruptVector_text_end;
311 extern char _KernelExceptionVector_literal_start;
312 extern char _KernelExceptionVector_text_end;
313 extern char _UserExceptionVector_literal_start;
314 extern char _UserExceptionVector_text_end;
315 extern char _DoubleExceptionVector_literal_start;
316 extern char _DoubleExceptionVector_text_end;
317 #if XCHAL_EXCM_LEVEL >= 2
318 extern char _Level2InterruptVector_text_start;
319 extern char _Level2InterruptVector_text_end;
320 #endif
321 #if XCHAL_EXCM_LEVEL >= 3
322 extern char _Level3InterruptVector_text_start;
323 extern char _Level3InterruptVector_text_end;
324 #endif
325 #if XCHAL_EXCM_LEVEL >= 4
326 extern char _Level4InterruptVector_text_start;
327 extern char _Level4InterruptVector_text_end;
328 #endif
329 #if XCHAL_EXCM_LEVEL >= 5
330 extern char _Level5InterruptVector_text_start;
331 extern char _Level5InterruptVector_text_end;
332 #endif
333 #if XCHAL_EXCM_LEVEL >= 6
334 extern char _Level6InterruptVector_text_start;
335 extern char _Level6InterruptVector_text_end;
336 #endif
337 #ifdef CONFIG_SMP
338 extern char _SecondaryResetVector_text_start;
339 extern char _SecondaryResetVector_text_end;
340 #endif
341 
342 
343 #ifdef CONFIG_S32C1I_SELFTEST
344 #if XCHAL_HAVE_S32C1I
345 
346 static int __initdata rcw_word, rcw_probe_pc, rcw_exc;
347 
348 /*
349  * Basic atomic compare-and-swap, that records PC of S32C1I for probing.
350  *
351  * If *v == cmp, set *v = set.  Return previous *v.
352  */
353 static inline int probed_compare_swap(int *v, int cmp, int set)
354 {
355 	int tmp;
356 
357 	__asm__ __volatile__(
358 			"	movi	%1, 1f\n"
359 			"	s32i	%1, %4, 0\n"
360 			"	wsr	%2, scompare1\n"
361 			"1:	s32c1i	%0, %3, 0\n"
362 			: "=a" (set), "=&a" (tmp)
363 			: "a" (cmp), "a" (v), "a" (&rcw_probe_pc), "0" (set)
364 			: "memory"
365 			);
366 	return set;
367 }
368 
369 /* Handle probed exception */
370 
371 static void __init do_probed_exception(struct pt_regs *regs,
372 		unsigned long exccause)
373 {
374 	if (regs->pc == rcw_probe_pc) {	/* exception on s32c1i ? */
375 		regs->pc += 3;		/* skip the s32c1i instruction */
376 		rcw_exc = exccause;
377 	} else {
378 		do_unhandled(regs, exccause);
379 	}
380 }
381 
382 /* Simple test of S32C1I (soc bringup assist) */
383 
384 static int __init check_s32c1i(void)
385 {
386 	int n, cause1, cause2;
387 	void *handbus, *handdata, *handaddr; /* temporarily saved handlers */
388 
389 	rcw_probe_pc = 0;
390 	handbus  = trap_set_handler(EXCCAUSE_LOAD_STORE_ERROR,
391 			do_probed_exception);
392 	handdata = trap_set_handler(EXCCAUSE_LOAD_STORE_DATA_ERROR,
393 			do_probed_exception);
394 	handaddr = trap_set_handler(EXCCAUSE_LOAD_STORE_ADDR_ERROR,
395 			do_probed_exception);
396 
397 	/* First try an S32C1I that does not store: */
398 	rcw_exc = 0;
399 	rcw_word = 1;
400 	n = probed_compare_swap(&rcw_word, 0, 2);
401 	cause1 = rcw_exc;
402 
403 	/* took exception? */
404 	if (cause1 != 0) {
405 		/* unclean exception? */
406 		if (n != 2 || rcw_word != 1)
407 			panic("S32C1I exception error");
408 	} else if (rcw_word != 1 || n != 1) {
409 		panic("S32C1I compare error");
410 	}
411 
412 	/* Then an S32C1I that stores: */
413 	rcw_exc = 0;
414 	rcw_word = 0x1234567;
415 	n = probed_compare_swap(&rcw_word, 0x1234567, 0xabcde);
416 	cause2 = rcw_exc;
417 
418 	if (cause2 != 0) {
419 		/* unclean exception? */
420 		if (n != 0xabcde || rcw_word != 0x1234567)
421 			panic("S32C1I exception error (b)");
422 	} else if (rcw_word != 0xabcde || n != 0x1234567) {
423 		panic("S32C1I store error");
424 	}
425 
426 	/* Verify consistency of exceptions: */
427 	if (cause1 || cause2) {
428 		pr_warn("S32C1I took exception %d, %d\n", cause1, cause2);
429 		/* If emulation of S32C1I upon bus error gets implemented,
430 		   we can get rid of this panic for single core (not SMP) */
431 		panic("S32C1I exceptions not currently supported");
432 	}
433 	if (cause1 != cause2)
434 		panic("inconsistent S32C1I exceptions");
435 
436 	trap_set_handler(EXCCAUSE_LOAD_STORE_ERROR, handbus);
437 	trap_set_handler(EXCCAUSE_LOAD_STORE_DATA_ERROR, handdata);
438 	trap_set_handler(EXCCAUSE_LOAD_STORE_ADDR_ERROR, handaddr);
439 	return 0;
440 }
441 
442 #else /* XCHAL_HAVE_S32C1I */
443 
444 /* This condition should not occur with a commercially deployed processor.
445    Display reminder for early engr test or demo chips / FPGA bitstreams */
446 static int __init check_s32c1i(void)
447 {
448 	pr_warn("Processor configuration lacks atomic compare-and-swap support!\n");
449 	return 0;
450 }
451 
452 #endif /* XCHAL_HAVE_S32C1I */
453 early_initcall(check_s32c1i);
454 #endif /* CONFIG_S32C1I_SELFTEST */
455 
456 
457 void __init setup_arch(char **cmdline_p)
458 {
459 	strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
460 	*cmdline_p = command_line;
461 
462 	/* Reserve some memory regions */
463 
464 #ifdef CONFIG_BLK_DEV_INITRD
465 	if (initrd_start < initrd_end) {
466 		initrd_is_mapped = mem_reserve(__pa(initrd_start),
467 					       __pa(initrd_end), 0) == 0;
468 		initrd_below_start_ok = 1;
469 	} else {
470 		initrd_start = 0;
471 	}
472 #endif
473 
474 	mem_reserve(__pa(&_stext),__pa(&_end), 1);
475 
476 	mem_reserve(__pa(&_WindowVectors_text_start),
477 		    __pa(&_WindowVectors_text_end), 0);
478 
479 	mem_reserve(__pa(&_DebugInterruptVector_literal_start),
480 		    __pa(&_DebugInterruptVector_text_end), 0);
481 
482 	mem_reserve(__pa(&_KernelExceptionVector_literal_start),
483 		    __pa(&_KernelExceptionVector_text_end), 0);
484 
485 	mem_reserve(__pa(&_UserExceptionVector_literal_start),
486 		    __pa(&_UserExceptionVector_text_end), 0);
487 
488 	mem_reserve(__pa(&_DoubleExceptionVector_literal_start),
489 		    __pa(&_DoubleExceptionVector_text_end), 0);
490 
491 #if XCHAL_EXCM_LEVEL >= 2
492 	mem_reserve(__pa(&_Level2InterruptVector_text_start),
493 		    __pa(&_Level2InterruptVector_text_end), 0);
494 #endif
495 #if XCHAL_EXCM_LEVEL >= 3
496 	mem_reserve(__pa(&_Level3InterruptVector_text_start),
497 		    __pa(&_Level3InterruptVector_text_end), 0);
498 #endif
499 #if XCHAL_EXCM_LEVEL >= 4
500 	mem_reserve(__pa(&_Level4InterruptVector_text_start),
501 		    __pa(&_Level4InterruptVector_text_end), 0);
502 #endif
503 #if XCHAL_EXCM_LEVEL >= 5
504 	mem_reserve(__pa(&_Level5InterruptVector_text_start),
505 		    __pa(&_Level5InterruptVector_text_end), 0);
506 #endif
507 #if XCHAL_EXCM_LEVEL >= 6
508 	mem_reserve(__pa(&_Level6InterruptVector_text_start),
509 		    __pa(&_Level6InterruptVector_text_end), 0);
510 #endif
511 
512 #ifdef CONFIG_SMP
513 	mem_reserve(__pa(&_SecondaryResetVector_text_start),
514 		    __pa(&_SecondaryResetVector_text_end), 0);
515 #endif
516 	parse_early_param();
517 	bootmem_init();
518 
519 	unflatten_and_copy_device_tree();
520 
521 	platform_setup(cmdline_p);
522 
523 #ifdef CONFIG_SMP
524 	smp_init_cpus();
525 #endif
526 
527 	paging_init();
528 	zones_init();
529 
530 #ifdef CONFIG_VT
531 # if defined(CONFIG_VGA_CONSOLE)
532 	conswitchp = &vga_con;
533 # elif defined(CONFIG_DUMMY_CONSOLE)
534 	conswitchp = &dummy_con;
535 # endif
536 #endif
537 
538 #ifdef CONFIG_PCI
539 	platform_pcibios_init();
540 #endif
541 }
542 
543 static DEFINE_PER_CPU(struct cpu, cpu_data);
544 
545 static int __init topology_init(void)
546 {
547 	int i;
548 
549 	for_each_possible_cpu(i) {
550 		struct cpu *cpu = &per_cpu(cpu_data, i);
551 		cpu->hotpluggable = !!i;
552 		register_cpu(cpu, i);
553 	}
554 
555 	return 0;
556 }
557 subsys_initcall(topology_init);
558 
559 void machine_restart(char * cmd)
560 {
561 	platform_restart();
562 }
563 
564 void machine_halt(void)
565 {
566 	platform_halt();
567 	while (1);
568 }
569 
570 void machine_power_off(void)
571 {
572 	platform_power_off();
573 	while (1);
574 }
575 #ifdef CONFIG_PROC_FS
576 
577 /*
578  * Display some core information through /proc/cpuinfo.
579  */
580 
581 static int
582 c_show(struct seq_file *f, void *slot)
583 {
584 	/* high-level stuff */
585 	seq_printf(f, "CPU count\t: %u\n"
586 		      "CPU list\t: %*pbl\n"
587 		      "vendor_id\t: Tensilica\n"
588 		      "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n"
589 		      "core ID\t\t: " XCHAL_CORE_ID "\n"
590 		      "build ID\t: 0x%x\n"
591 		      "byte order\t: %s\n"
592 		      "cpu MHz\t\t: %lu.%02lu\n"
593 		      "bogomips\t: %lu.%02lu\n",
594 		      num_online_cpus(),
595 		      cpumask_pr_args(cpu_online_mask),
596 		      XCHAL_BUILD_UNIQUE_ID,
597 		      XCHAL_HAVE_BE ?  "big" : "little",
598 		      ccount_freq/1000000,
599 		      (ccount_freq/10000) % 100,
600 		      loops_per_jiffy/(500000/HZ),
601 		      (loops_per_jiffy/(5000/HZ)) % 100);
602 
603 	seq_printf(f,"flags\t\t: "
604 #if XCHAL_HAVE_NMI
605 		     "nmi "
606 #endif
607 #if XCHAL_HAVE_DEBUG
608 		     "debug "
609 # if XCHAL_HAVE_OCD
610 		     "ocd "
611 # endif
612 #endif
613 #if XCHAL_HAVE_DENSITY
614 	    	     "density "
615 #endif
616 #if XCHAL_HAVE_BOOLEANS
617 		     "boolean "
618 #endif
619 #if XCHAL_HAVE_LOOPS
620 		     "loop "
621 #endif
622 #if XCHAL_HAVE_NSA
623 		     "nsa "
624 #endif
625 #if XCHAL_HAVE_MINMAX
626 		     "minmax "
627 #endif
628 #if XCHAL_HAVE_SEXT
629 		     "sext "
630 #endif
631 #if XCHAL_HAVE_CLAMPS
632 		     "clamps "
633 #endif
634 #if XCHAL_HAVE_MAC16
635 		     "mac16 "
636 #endif
637 #if XCHAL_HAVE_MUL16
638 		     "mul16 "
639 #endif
640 #if XCHAL_HAVE_MUL32
641 		     "mul32 "
642 #endif
643 #if XCHAL_HAVE_MUL32_HIGH
644 		     "mul32h "
645 #endif
646 #if XCHAL_HAVE_FP
647 		     "fpu "
648 #endif
649 #if XCHAL_HAVE_S32C1I
650 		     "s32c1i "
651 #endif
652 		     "\n");
653 
654 	/* Registers. */
655 	seq_printf(f,"physical aregs\t: %d\n"
656 		     "misc regs\t: %d\n"
657 		     "ibreak\t\t: %d\n"
658 		     "dbreak\t\t: %d\n",
659 		     XCHAL_NUM_AREGS,
660 		     XCHAL_NUM_MISC_REGS,
661 		     XCHAL_NUM_IBREAK,
662 		     XCHAL_NUM_DBREAK);
663 
664 
665 	/* Interrupt. */
666 	seq_printf(f,"num ints\t: %d\n"
667 		     "ext ints\t: %d\n"
668 		     "int levels\t: %d\n"
669 		     "timers\t\t: %d\n"
670 		     "debug level\t: %d\n",
671 		     XCHAL_NUM_INTERRUPTS,
672 		     XCHAL_NUM_EXTINTERRUPTS,
673 		     XCHAL_NUM_INTLEVELS,
674 		     XCHAL_NUM_TIMERS,
675 		     XCHAL_DEBUGLEVEL);
676 
677 	/* Cache */
678 	seq_printf(f,"icache line size: %d\n"
679 		     "icache ways\t: %d\n"
680 		     "icache size\t: %d\n"
681 		     "icache flags\t: "
682 #if XCHAL_ICACHE_LINE_LOCKABLE
683 		     "lock "
684 #endif
685 		     "\n"
686 		     "dcache line size: %d\n"
687 		     "dcache ways\t: %d\n"
688 		     "dcache size\t: %d\n"
689 		     "dcache flags\t: "
690 #if XCHAL_DCACHE_IS_WRITEBACK
691 		     "writeback "
692 #endif
693 #if XCHAL_DCACHE_LINE_LOCKABLE
694 		     "lock "
695 #endif
696 		     "\n",
697 		     XCHAL_ICACHE_LINESIZE,
698 		     XCHAL_ICACHE_WAYS,
699 		     XCHAL_ICACHE_SIZE,
700 		     XCHAL_DCACHE_LINESIZE,
701 		     XCHAL_DCACHE_WAYS,
702 		     XCHAL_DCACHE_SIZE);
703 
704 	return 0;
705 }
706 
707 /*
708  * We show only CPU #0 info.
709  */
710 static void *
711 c_start(struct seq_file *f, loff_t *pos)
712 {
713 	return (*pos == 0) ? (void *)1 : NULL;
714 }
715 
716 static void *
717 c_next(struct seq_file *f, void *v, loff_t *pos)
718 {
719 	return NULL;
720 }
721 
722 static void
723 c_stop(struct seq_file *f, void *v)
724 {
725 }
726 
727 const struct seq_operations cpuinfo_op =
728 {
729 	.start	= c_start,
730 	.next	= c_next,
731 	.stop	= c_stop,
732 	.show	= c_show,
733 };
734 
735 #endif /* CONFIG_PROC_FS */
736