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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 */
5
6#include <linux/seq_file.h>
7#include <linux/fs.h>
8#include <linux/delay.h>
9#include <linux/root_dev.h>
10#include <linux/clk.h>
11#include <linux/clocksource.h>
12#include <linux/console.h>
13#include <linux/module.h>
14#include <linux/sizes.h>
15#include <linux/cpu.h>
16#include <linux/of_clk.h>
17#include <linux/of_fdt.h>
18#include <linux/of.h>
19#include <linux/cache.h>
20#include <uapi/linux/mount.h>
21#include <asm/sections.h>
22#include <asm/arcregs.h>
23#include <asm/asserts.h>
24#include <asm/tlb.h>
25#include <asm/setup.h>
26#include <asm/page.h>
27#include <asm/irq.h>
28#include <asm/unwind.h>
29#include <asm/mach_desc.h>
30#include <asm/smp.h>
31#include <asm/dsp-impl.h>
32
33#define FIX_PTR(x) __asm__ __volatile__(";" : "+r"(x))
34
35unsigned int intr_to_DE_cnt;
36
37/* Part of U-boot ABI: see head.S */
38int __initdata uboot_tag;
39int __initdata uboot_magic;
40char __initdata *uboot_arg;
41
42const struct machine_desc *machine_desc;
43
44struct task_struct *_current_task[NR_CPUS]; /* For stack switching */
45
46struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
47
48static const struct id_to_str arc_legacy_rel[] = {
49 /* ID.ARCVER, Release */
50#ifdef CONFIG_ISA_ARCOMPACT
51 { 0x34, "R4.10"},
52 { 0x35, "R4.11"},
53#else
54 { 0x51, "R2.0" },
55 { 0x52, "R2.1" },
56 { 0x53, "R3.0" },
57#endif
58 { 0x00, NULL }
59};
60
61static const struct id_to_str arc_hs_ver54_rel[] = {
62 /* UARCH.MAJOR, Release */
63 { 0, "R3.10a"},
64 { 1, "R3.50a"},
65 { 2, "R3.60a"},
66 { 3, "R4.00a"},
67 { 0xFF, NULL }
68};
69
70static void read_decode_ccm_bcr(struct cpuinfo_arc *cpu)
71{
72 if (is_isa_arcompact()) {
73 struct bcr_iccm_arcompact iccm;
74 struct bcr_dccm_arcompact dccm;
75
76 READ_BCR(ARC_REG_ICCM_BUILD, iccm);
77 if (iccm.ver) {
78 cpu->iccm.sz = 4096 << iccm.sz; /* 8K to 512K */
79 cpu->iccm.base_addr = iccm.base << 16;
80 }
81
82 READ_BCR(ARC_REG_DCCM_BUILD, dccm);
83 if (dccm.ver) {
84 unsigned long base;
85 cpu->dccm.sz = 2048 << dccm.sz; /* 2K to 256K */
86
87 base = read_aux_reg(ARC_REG_DCCM_BASE_BUILD);
88 cpu->dccm.base_addr = base & ~0xF;
89 }
90 } else {
91 struct bcr_iccm_arcv2 iccm;
92 struct bcr_dccm_arcv2 dccm;
93 unsigned long region;
94
95 READ_BCR(ARC_REG_ICCM_BUILD, iccm);
96 if (iccm.ver) {
97 cpu->iccm.sz = 256 << iccm.sz00; /* 512B to 16M */
98 if (iccm.sz00 == 0xF && iccm.sz01 > 0)
99 cpu->iccm.sz <<= iccm.sz01;
100
101 region = read_aux_reg(ARC_REG_AUX_ICCM);
102 cpu->iccm.base_addr = region & 0xF0000000;
103 }
104
105 READ_BCR(ARC_REG_DCCM_BUILD, dccm);
106 if (dccm.ver) {
107 cpu->dccm.sz = 256 << dccm.sz0;
108 if (dccm.sz0 == 0xF && dccm.sz1 > 0)
109 cpu->dccm.sz <<= dccm.sz1;
110
111 region = read_aux_reg(ARC_REG_AUX_DCCM);
112 cpu->dccm.base_addr = region & 0xF0000000;
113 }
114 }
115}
116
117static void decode_arc_core(struct cpuinfo_arc *cpu)
118{
119 struct bcr_uarch_build_arcv2 uarch;
120 const struct id_to_str *tbl;
121
122 if (cpu->core.family < 0x54) { /* includes arc700 */
123
124 for (tbl = &arc_legacy_rel[0]; tbl->id != 0; tbl++) {
125 if (cpu->core.family == tbl->id) {
126 cpu->release = tbl->str;
127 break;
128 }
129 }
130
131 if (is_isa_arcompact())
132 cpu->name = "ARC700";
133 else if (tbl->str)
134 cpu->name = "HS38";
135 else
136 cpu->name = cpu->release = "Unknown";
137
138 return;
139 }
140
141 /*
142 * Initial HS cores bumped AUX IDENTITY.ARCVER for each release until
143 * ARCVER 0x54 which introduced AUX MICRO_ARCH_BUILD and subsequent
144 * releases only update it.
145 */
146 READ_BCR(ARC_REG_MICRO_ARCH_BCR, uarch);
147
148 if (uarch.prod == 4) {
149 cpu->name = "HS48";
150 cpu->extn.dual = 1;
151
152 } else {
153 cpu->name = "HS38";
154 }
155
156 for (tbl = &arc_hs_ver54_rel[0]; tbl->id != 0xFF; tbl++) {
157 if (uarch.maj == tbl->id) {
158 cpu->release = tbl->str;
159 break;
160 }
161 }
162}
163
164static void read_arc_build_cfg_regs(void)
165{
166 struct bcr_timer timer;
167 struct bcr_generic bcr;
168 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
169 struct bcr_isa_arcv2 isa;
170 struct bcr_actionpoint ap;
171
172 FIX_PTR(cpu);
173
174 READ_BCR(AUX_IDENTITY, cpu->core);
175 decode_arc_core(cpu);
176
177 READ_BCR(ARC_REG_TIMERS_BCR, timer);
178 cpu->extn.timer0 = timer.t0;
179 cpu->extn.timer1 = timer.t1;
180 cpu->extn.rtc = timer.rtc;
181
182 cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
183
184 READ_BCR(ARC_REG_MUL_BCR, cpu->extn_mpy);
185
186 /* Read CCM BCRs for boot reporting even if not enabled in Kconfig */
187 read_decode_ccm_bcr(cpu);
188
189 read_decode_mmu_bcr();
190 read_decode_cache_bcr();
191
192 if (is_isa_arcompact()) {
193 struct bcr_fp_arcompact sp, dp;
194 struct bcr_bpu_arcompact bpu;
195
196 READ_BCR(ARC_REG_FP_BCR, sp);
197 READ_BCR(ARC_REG_DPFP_BCR, dp);
198 cpu->extn.fpu_sp = sp.ver ? 1 : 0;
199 cpu->extn.fpu_dp = dp.ver ? 1 : 0;
200
201 READ_BCR(ARC_REG_BPU_BCR, bpu);
202 cpu->bpu.ver = bpu.ver;
203 cpu->bpu.full = bpu.fam ? 1 : 0;
204 if (bpu.ent) {
205 cpu->bpu.num_cache = 256 << (bpu.ent - 1);
206 cpu->bpu.num_pred = 256 << (bpu.ent - 1);
207 }
208 } else {
209 struct bcr_fp_arcv2 spdp;
210 struct bcr_bpu_arcv2 bpu;
211
212 READ_BCR(ARC_REG_FP_V2_BCR, spdp);
213 cpu->extn.fpu_sp = spdp.sp ? 1 : 0;
214 cpu->extn.fpu_dp = spdp.dp ? 1 : 0;
215
216 READ_BCR(ARC_REG_BPU_BCR, bpu);
217 cpu->bpu.ver = bpu.ver;
218 cpu->bpu.full = bpu.ft;
219 cpu->bpu.num_cache = 256 << bpu.bce;
220 cpu->bpu.num_pred = 2048 << bpu.pte;
221 cpu->bpu.ret_stk = 4 << bpu.rse;
222
223 /* if dual issue hardware, is it enabled ? */
224 if (cpu->extn.dual) {
225 unsigned int exec_ctrl;
226
227 READ_BCR(AUX_EXEC_CTRL, exec_ctrl);
228 cpu->extn.dual_enb = !(exec_ctrl & 1);
229 }
230 }
231
232 READ_BCR(ARC_REG_AP_BCR, ap);
233 if (ap.ver) {
234 cpu->extn.ap_num = 2 << ap.num;
235 cpu->extn.ap_full = !ap.min;
236 }
237
238 READ_BCR(ARC_REG_SMART_BCR, bcr);
239 cpu->extn.smart = bcr.ver ? 1 : 0;
240
241 READ_BCR(ARC_REG_RTT_BCR, bcr);
242 cpu->extn.rtt = bcr.ver ? 1 : 0;
243
244 READ_BCR(ARC_REG_ISA_CFG_BCR, isa);
245
246 /* some hacks for lack of feature BCR info in old ARC700 cores */
247 if (is_isa_arcompact()) {
248 if (!isa.ver) /* ISA BCR absent, use Kconfig info */
249 cpu->isa.atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC);
250 else {
251 /* ARC700_BUILD only has 2 bits of isa info */
252 struct bcr_generic bcr = *(struct bcr_generic *)&isa;
253 cpu->isa.atomic = bcr.info & 1;
254 }
255
256 cpu->isa.be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
257
258 /* there's no direct way to distinguish 750 vs. 770 */
259 if (unlikely(cpu->core.family < 0x34 || cpu->mmu.ver < 3))
260 cpu->name = "ARC750";
261 } else {
262 cpu->isa = isa;
263 }
264}
265
266static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
267{
268 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
269 struct bcr_identity *core = &cpu->core;
270 char mpy_opt[16];
271 int n = 0;
272
273 FIX_PTR(cpu);
274
275 n += scnprintf(buf + n, len - n,
276 "\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n",
277 core->family, core->cpu_id, core->chip_id);
278
279 n += scnprintf(buf + n, len - n, "processor [%d]\t: %s %s (%s ISA) %s%s%s\n",
280 cpu_id, cpu->name, cpu->release,
281 is_isa_arcompact() ? "ARCompact" : "ARCv2",
282 IS_AVAIL1(cpu->isa.be, "[Big-Endian]"),
283 IS_AVAIL3(cpu->extn.dual, cpu->extn.dual_enb, " Dual-Issue "));
284
285 n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s%s%s\nISA Extn\t: ",
286 IS_AVAIL1(cpu->extn.timer0, "Timer0 "),
287 IS_AVAIL1(cpu->extn.timer1, "Timer1 "),
288 IS_AVAIL2(cpu->extn.rtc, "RTC [UP 64-bit] ", CONFIG_ARC_TIMERS_64BIT),
289 IS_AVAIL2(cpu->extn.gfrc, "GFRC [SMP 64-bit] ", CONFIG_ARC_TIMERS_64BIT));
290
291 if (cpu->extn_mpy.ver) {
292 if (is_isa_arcompact()) {
293 scnprintf(mpy_opt, 16, "mpy");
294 } else {
295
296 int opt = 2; /* stock MPY/MPYH */
297
298 if (cpu->extn_mpy.dsp) /* OPT 7-9 */
299 opt = cpu->extn_mpy.dsp + 6;
300
301 scnprintf(mpy_opt, 16, "mpy[opt %d] ", opt);
302 }
303 }
304
305 n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n",
306 IS_AVAIL2(cpu->isa.atomic, "atomic ", CONFIG_ARC_HAS_LLSC),
307 IS_AVAIL2(cpu->isa.ldd, "ll64 ", CONFIG_ARC_HAS_LL64),
308 IS_AVAIL2(cpu->isa.unalign, "unalign ", CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS),
309 IS_AVAIL1(cpu->extn_mpy.ver, mpy_opt),
310 IS_AVAIL1(cpu->isa.div_rem, "div_rem "));
311
312 if (cpu->bpu.ver) {
313 n += scnprintf(buf + n, len - n,
314 "BPU\t\t: %s%s match, cache:%d, Predict Table:%d Return stk: %d",
315 IS_AVAIL1(cpu->bpu.full, "full"),
316 IS_AVAIL1(!cpu->bpu.full, "partial"),
317 cpu->bpu.num_cache, cpu->bpu.num_pred, cpu->bpu.ret_stk);
318
319 if (is_isa_arcv2()) {
320 struct bcr_lpb lpb;
321
322 READ_BCR(ARC_REG_LPB_BUILD, lpb);
323 if (lpb.ver) {
324 unsigned int ctl;
325 ctl = read_aux_reg(ARC_REG_LPB_CTRL);
326
327 n += scnprintf(buf + n, len - n, " Loop Buffer:%d %s",
328 lpb.entries,
329 IS_DISABLED_RUN(!ctl));
330 }
331 }
332 n += scnprintf(buf + n, len - n, "\n");
333 }
334
335 return buf;
336}
337
338static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
339{
340 int n = 0;
341 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
342
343 FIX_PTR(cpu);
344
345 n += scnprintf(buf + n, len - n, "Vector Table\t: %#x\n", cpu->vec_base);
346
347 if (cpu->extn.fpu_sp || cpu->extn.fpu_dp)
348 n += scnprintf(buf + n, len - n, "FPU\t\t: %s%s\n",
349 IS_AVAIL1(cpu->extn.fpu_sp, "SP "),
350 IS_AVAIL1(cpu->extn.fpu_dp, "DP "));
351
352 if (cpu->extn.ap_num | cpu->extn.smart | cpu->extn.rtt) {
353 n += scnprintf(buf + n, len - n, "DEBUG\t\t: %s%s",
354 IS_AVAIL1(cpu->extn.smart, "smaRT "),
355 IS_AVAIL1(cpu->extn.rtt, "RTT "));
356 if (cpu->extn.ap_num) {
357 n += scnprintf(buf + n, len - n, "ActionPoint %d/%s",
358 cpu->extn.ap_num,
359 cpu->extn.ap_full ? "full":"min");
360 }
361 n += scnprintf(buf + n, len - n, "\n");
362 }
363
364 if (cpu->dccm.sz || cpu->iccm.sz)
365 n += scnprintf(buf + n, len - n, "Extn [CCM]\t: DCCM @ %x, %d KB / ICCM: @ %x, %d KB\n",
366 cpu->dccm.base_addr, TO_KB(cpu->dccm.sz),
367 cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
368
369 if (is_isa_arcv2()) {
370
371 /* Error Protection: ECC/Parity */
372 struct bcr_erp erp;
373 READ_BCR(ARC_REG_ERP_BUILD, erp);
374
375 if (erp.ver) {
376 struct ctl_erp ctl;
377 READ_BCR(ARC_REG_ERP_CTRL, ctl);
378
379 /* inverted bits: 0 means enabled */
380 n += scnprintf(buf + n, len - n, "Extn [ECC]\t: %s%s%s%s%s%s\n",
381 IS_AVAIL3(erp.ic, !ctl.dpi, "IC "),
382 IS_AVAIL3(erp.dc, !ctl.dpd, "DC "),
383 IS_AVAIL3(erp.mmu, !ctl.mpd, "MMU "));
384 }
385 }
386
387 return buf;
388}
389
390void chk_opt_strict(char *opt_name, bool hw_exists, bool opt_ena)
391{
392 if (hw_exists && !opt_ena)
393 pr_warn(" ! Enable %s for working apps\n", opt_name);
394 else if (!hw_exists && opt_ena)
395 panic("Disable %s, hardware NOT present\n", opt_name);
396}
397
398void chk_opt_weak(char *opt_name, bool hw_exists, bool opt_ena)
399{
400 if (!hw_exists && opt_ena)
401 panic("Disable %s, hardware NOT present\n", opt_name);
402}
403
404static void arc_chk_core_config(void)
405{
406 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
407 int present = 0;
408
409 if (!cpu->extn.timer0)
410 panic("Timer0 is not present!\n");
411
412 if (!cpu->extn.timer1)
413 panic("Timer1 is not present!\n");
414
415#ifdef CONFIG_ARC_HAS_DCCM
416 /*
417 * DCCM can be arbit placed in hardware.
418 * Make sure it's placement/sz matches what Linux is built with
419 */
420 if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
421 panic("Linux built with incorrect DCCM Base address\n");
422
423 if (CONFIG_ARC_DCCM_SZ * SZ_1K != cpu->dccm.sz)
424 panic("Linux built with incorrect DCCM Size\n");
425#endif
426
427#ifdef CONFIG_ARC_HAS_ICCM
428 if (CONFIG_ARC_ICCM_SZ * SZ_1K != cpu->iccm.sz)
429 panic("Linux built with incorrect ICCM Size\n");
430#endif
431
432 /*
433 * FP hardware/software config sanity
434 * -If hardware present, kernel needs to save/restore FPU state
435 * -If not, it will crash trying to save/restore the non-existant regs
436 */
437
438 if (is_isa_arcompact()) {
439 /* only DPDP checked since SP has no arch visible regs */
440 present = cpu->extn.fpu_dp;
441 CHK_OPT_STRICT(CONFIG_ARC_FPU_SAVE_RESTORE, present);
442 } else {
443 /* Accumulator Low:High pair (r58:59) present if DSP MPY or FPU */
444 present = cpu->extn_mpy.dsp | cpu->extn.fpu_sp | cpu->extn.fpu_dp;
445 CHK_OPT_STRICT(CONFIG_ARC_HAS_ACCL_REGS, present);
446
447 dsp_config_check();
448 }
449}
450
451/*
452 * Initialize and setup the processor core
453 * This is called by all the CPUs thus should not do special case stuff
454 * such as only for boot CPU etc
455 */
456
457void setup_processor(void)
458{
459 char str[512];
460 int cpu_id = smp_processor_id();
461
462 read_arc_build_cfg_regs();
463 arc_init_IRQ();
464
465 pr_info("%s", arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
466
467 arc_mmu_init();
468 arc_cache_init();
469
470 pr_info("%s", arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
471 pr_info("%s", arc_platform_smp_cpuinfo());
472
473 arc_chk_core_config();
474}
475
476static inline bool uboot_arg_invalid(unsigned long addr)
477{
478 /*
479 * Check that it is a untranslated address (although MMU is not enabled
480 * yet, it being a high address ensures this is not by fluke)
481 */
482 if (addr < PAGE_OFFSET)
483 return true;
484
485 /* Check that address doesn't clobber resident kernel image */
486 return addr >= (unsigned long)_stext && addr <= (unsigned long)_end;
487}
488
489#define IGNORE_ARGS "Ignore U-boot args: "
490
491/* uboot_tag values for U-boot - kernel ABI revision 0; see head.S */
492#define UBOOT_TAG_NONE 0
493#define UBOOT_TAG_CMDLINE 1
494#define UBOOT_TAG_DTB 2
495/* We always pass 0 as magic from U-boot */
496#define UBOOT_MAGIC_VALUE 0
497
498void __init handle_uboot_args(void)
499{
500 bool use_embedded_dtb = true;
501 bool append_cmdline = false;
502
503 /* check that we know this tag */
504 if (uboot_tag != UBOOT_TAG_NONE &&
505 uboot_tag != UBOOT_TAG_CMDLINE &&
506 uboot_tag != UBOOT_TAG_DTB) {
507 pr_warn(IGNORE_ARGS "invalid uboot tag: '%08x'\n", uboot_tag);
508 goto ignore_uboot_args;
509 }
510
511 if (uboot_magic != UBOOT_MAGIC_VALUE) {
512 pr_warn(IGNORE_ARGS "non zero uboot magic\n");
513 goto ignore_uboot_args;
514 }
515
516 if (uboot_tag != UBOOT_TAG_NONE &&
517 uboot_arg_invalid((unsigned long)uboot_arg)) {
518 pr_warn(IGNORE_ARGS "invalid uboot arg: '%px'\n", uboot_arg);
519 goto ignore_uboot_args;
520 }
521
522 /* see if U-boot passed an external Device Tree blob */
523 if (uboot_tag == UBOOT_TAG_DTB) {
524 machine_desc = setup_machine_fdt((void *)uboot_arg);
525
526 /* external Device Tree blob is invalid - use embedded one */
527 use_embedded_dtb = !machine_desc;
528 }
529
530 if (uboot_tag == UBOOT_TAG_CMDLINE)
531 append_cmdline = true;
532
533ignore_uboot_args:
534
535 if (use_embedded_dtb) {
536 machine_desc = setup_machine_fdt(__dtb_start);
537 if (!machine_desc)
538 panic("Embedded DT invalid\n");
539 }
540
541 /*
542 * NOTE: @boot_command_line is populated by setup_machine_fdt() so this
543 * append processing can only happen after.
544 */
545 if (append_cmdline) {
546 /* Ensure a whitespace between the 2 cmdlines */
547 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
548 strlcat(boot_command_line, uboot_arg, COMMAND_LINE_SIZE);
549 }
550}
551
552void __init setup_arch(char **cmdline_p)
553{
554 handle_uboot_args();
555
556 /* Save unparsed command line copy for /proc/cmdline */
557 *cmdline_p = boot_command_line;
558
559 /* To force early parsing of things like mem=xxx */
560 parse_early_param();
561
562 /* Platform/board specific: e.g. early console registration */
563 if (machine_desc->init_early)
564 machine_desc->init_early();
565
566 smp_init_cpus();
567
568 setup_processor();
569 setup_arch_memory();
570
571 /* copy flat DT out of .init and then unflatten it */
572 unflatten_and_copy_device_tree();
573
574 /* Can be issue if someone passes cmd line arg "ro"
575 * But that is unlikely so keeping it as it is
576 */
577 root_mountflags &= ~MS_RDONLY;
578
579 arc_unwind_init();
580}
581
582/*
583 * Called from start_kernel() - boot CPU only
584 */
585void __init time_init(void)
586{
587 of_clk_init(NULL);
588 timer_probe();
589}
590
591static int __init customize_machine(void)
592{
593 if (machine_desc->init_machine)
594 machine_desc->init_machine();
595
596 return 0;
597}
598arch_initcall(customize_machine);
599
600static int __init init_late_machine(void)
601{
602 if (machine_desc->init_late)
603 machine_desc->init_late();
604
605 return 0;
606}
607late_initcall(init_late_machine);
608/*
609 * Get CPU information for use by the procfs.
610 */
611
612#define cpu_to_ptr(c) ((void *)(0xFFFF0000 | (unsigned int)(c)))
613#define ptr_to_cpu(p) (~0xFFFF0000UL & (unsigned int)(p))
614
615static int show_cpuinfo(struct seq_file *m, void *v)
616{
617 char *str;
618 int cpu_id = ptr_to_cpu(v);
619 struct device *cpu_dev = get_cpu_device(cpu_id);
620 struct clk *cpu_clk;
621 unsigned long freq = 0;
622
623 if (!cpu_online(cpu_id)) {
624 seq_printf(m, "processor [%d]\t: Offline\n", cpu_id);
625 goto done;
626 }
627
628 str = (char *)__get_free_page(GFP_KERNEL);
629 if (!str)
630 goto done;
631
632 seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
633
634 cpu_clk = clk_get(cpu_dev, NULL);
635 if (IS_ERR(cpu_clk)) {
636 seq_printf(m, "CPU speed \t: Cannot get clock for processor [%d]\n",
637 cpu_id);
638 } else {
639 freq = clk_get_rate(cpu_clk);
640 }
641 if (freq)
642 seq_printf(m, "CPU speed\t: %lu.%02lu Mhz\n",
643 freq / 1000000, (freq / 10000) % 100);
644
645 seq_printf(m, "Bogo MIPS\t: %lu.%02lu\n",
646 loops_per_jiffy / (500000 / HZ),
647 (loops_per_jiffy / (5000 / HZ)) % 100);
648
649 seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
650 seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
651 seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
652 seq_printf(m, arc_platform_smp_cpuinfo());
653
654 free_page((unsigned long)str);
655done:
656 seq_printf(m, "\n");
657
658 return 0;
659}
660
661static void *c_start(struct seq_file *m, loff_t *pos)
662{
663 /*
664 * Callback returns cpu-id to iterator for show routine, NULL to stop.
665 * However since NULL is also a valid cpu-id (0), we use a round-about
666 * way to pass it w/o having to kmalloc/free a 2 byte string.
667 * Encode cpu-id as 0xFFcccc, which is decoded by show routine.
668 */
669 return *pos < nr_cpu_ids ? cpu_to_ptr(*pos) : NULL;
670}
671
672static void *c_next(struct seq_file *m, void *v, loff_t *pos)
673{
674 ++*pos;
675 return c_start(m, pos);
676}
677
678static void c_stop(struct seq_file *m, void *v)
679{
680}
681
682const struct seq_operations cpuinfo_op = {
683 .start = c_start,
684 .next = c_next,
685 .stop = c_stop,
686 .show = show_cpuinfo
687};
688
689static DEFINE_PER_CPU(struct cpu, cpu_topology);
690
691static int __init topology_init(void)
692{
693 int cpu;
694
695 for_each_present_cpu(cpu)
696 register_cpu(&per_cpu(cpu_topology, cpu), cpu);
697
698 return 0;
699}
700
701subsys_initcall(topology_init);
1/*
2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9#include <linux/seq_file.h>
10#include <linux/fs.h>
11#include <linux/delay.h>
12#include <linux/root_dev.h>
13#include <linux/clk-provider.h>
14#include <linux/clocksource.h>
15#include <linux/console.h>
16#include <linux/module.h>
17#include <linux/cpu.h>
18#include <linux/of_fdt.h>
19#include <linux/of.h>
20#include <linux/cache.h>
21#include <asm/sections.h>
22#include <asm/arcregs.h>
23#include <asm/tlb.h>
24#include <asm/setup.h>
25#include <asm/page.h>
26#include <asm/irq.h>
27#include <asm/unwind.h>
28#include <asm/mach_desc.h>
29#include <asm/smp.h>
30
31#define FIX_PTR(x) __asm__ __volatile__(";" : "+r"(x))
32
33unsigned int intr_to_DE_cnt;
34
35/* Part of U-boot ABI: see head.S */
36int __initdata uboot_tag;
37char __initdata *uboot_arg;
38
39const struct machine_desc *machine_desc;
40
41struct task_struct *_current_task[NR_CPUS]; /* For stack switching */
42
43struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
44
45static const struct id_to_str arc_cpu_rel[] = {
46#ifdef CONFIG_ISA_ARCOMPACT
47 { 0x34, "R4.10"},
48 { 0x35, "R4.11"},
49#else
50 { 0x51, "R2.0" },
51 { 0x52, "R2.1" },
52 { 0x53, "R3.0" },
53#endif
54 { 0x00, NULL }
55};
56
57static const struct id_to_str arc_cpu_nm[] = {
58#ifdef CONFIG_ISA_ARCOMPACT
59 { 0x20, "ARC 600" },
60 { 0x30, "ARC 770" }, /* 750 identified seperately */
61#else
62 { 0x40, "ARC EM" },
63 { 0x50, "ARC HS38" },
64#endif
65 { 0x00, "Unknown" }
66};
67
68static void read_decode_ccm_bcr(struct cpuinfo_arc *cpu)
69{
70 if (is_isa_arcompact()) {
71 struct bcr_iccm_arcompact iccm;
72 struct bcr_dccm_arcompact dccm;
73
74 READ_BCR(ARC_REG_ICCM_BUILD, iccm);
75 if (iccm.ver) {
76 cpu->iccm.sz = 4096 << iccm.sz; /* 8K to 512K */
77 cpu->iccm.base_addr = iccm.base << 16;
78 }
79
80 READ_BCR(ARC_REG_DCCM_BUILD, dccm);
81 if (dccm.ver) {
82 unsigned long base;
83 cpu->dccm.sz = 2048 << dccm.sz; /* 2K to 256K */
84
85 base = read_aux_reg(ARC_REG_DCCM_BASE_BUILD);
86 cpu->dccm.base_addr = base & ~0xF;
87 }
88 } else {
89 struct bcr_iccm_arcv2 iccm;
90 struct bcr_dccm_arcv2 dccm;
91 unsigned long region;
92
93 READ_BCR(ARC_REG_ICCM_BUILD, iccm);
94 if (iccm.ver) {
95 cpu->iccm.sz = 256 << iccm.sz00; /* 512B to 16M */
96 if (iccm.sz00 == 0xF && iccm.sz01 > 0)
97 cpu->iccm.sz <<= iccm.sz01;
98
99 region = read_aux_reg(ARC_REG_AUX_ICCM);
100 cpu->iccm.base_addr = region & 0xF0000000;
101 }
102
103 READ_BCR(ARC_REG_DCCM_BUILD, dccm);
104 if (dccm.ver) {
105 cpu->dccm.sz = 256 << dccm.sz0;
106 if (dccm.sz0 == 0xF && dccm.sz1 > 0)
107 cpu->dccm.sz <<= dccm.sz1;
108
109 region = read_aux_reg(ARC_REG_AUX_DCCM);
110 cpu->dccm.base_addr = region & 0xF0000000;
111 }
112 }
113}
114
115static void read_arc_build_cfg_regs(void)
116{
117 struct bcr_timer timer;
118 struct bcr_generic bcr;
119 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
120 const struct id_to_str *tbl;
121
122 FIX_PTR(cpu);
123
124 READ_BCR(AUX_IDENTITY, cpu->core);
125 READ_BCR(ARC_REG_ISA_CFG_BCR, cpu->isa);
126
127 for (tbl = &arc_cpu_rel[0]; tbl->id != 0; tbl++) {
128 if (cpu->core.family == tbl->id) {
129 cpu->details = tbl->str;
130 break;
131 }
132 }
133
134 for (tbl = &arc_cpu_nm[0]; tbl->id != 0; tbl++) {
135 if ((cpu->core.family & 0xF0) == tbl->id)
136 break;
137 }
138 cpu->name = tbl->str;
139
140 READ_BCR(ARC_REG_TIMERS_BCR, timer);
141 cpu->extn.timer0 = timer.t0;
142 cpu->extn.timer1 = timer.t1;
143 cpu->extn.rtc = timer.rtc;
144
145 cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
146
147 READ_BCR(ARC_REG_MUL_BCR, cpu->extn_mpy);
148
149 cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR) > 1 ? 1 : 0; /* 2,3 */
150 cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR) > 1 ? 1 : 0; /* 2,3 */
151 cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR) ? 1 : 0; /* 1,3 */
152 cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR) ? 1 : 0;
153 cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR) > 1 ? 1 : 0; /* 2 */
154 cpu->extn.swape = (cpu->core.family >= 0x34) ? 1 :
155 IS_ENABLED(CONFIG_ARC_HAS_SWAPE);
156
157 READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem);
158
159 /* Read CCM BCRs for boot reporting even if not enabled in Kconfig */
160 read_decode_ccm_bcr(cpu);
161
162 read_decode_mmu_bcr();
163 read_decode_cache_bcr();
164
165 if (is_isa_arcompact()) {
166 struct bcr_fp_arcompact sp, dp;
167 struct bcr_bpu_arcompact bpu;
168
169 READ_BCR(ARC_REG_FP_BCR, sp);
170 READ_BCR(ARC_REG_DPFP_BCR, dp);
171 cpu->extn.fpu_sp = sp.ver ? 1 : 0;
172 cpu->extn.fpu_dp = dp.ver ? 1 : 0;
173
174 READ_BCR(ARC_REG_BPU_BCR, bpu);
175 cpu->bpu.ver = bpu.ver;
176 cpu->bpu.full = bpu.fam ? 1 : 0;
177 if (bpu.ent) {
178 cpu->bpu.num_cache = 256 << (bpu.ent - 1);
179 cpu->bpu.num_pred = 256 << (bpu.ent - 1);
180 }
181 } else {
182 struct bcr_fp_arcv2 spdp;
183 struct bcr_bpu_arcv2 bpu;
184
185 READ_BCR(ARC_REG_FP_V2_BCR, spdp);
186 cpu->extn.fpu_sp = spdp.sp ? 1 : 0;
187 cpu->extn.fpu_dp = spdp.dp ? 1 : 0;
188
189 READ_BCR(ARC_REG_BPU_BCR, bpu);
190 cpu->bpu.ver = bpu.ver;
191 cpu->bpu.full = bpu.ft;
192 cpu->bpu.num_cache = 256 << bpu.bce;
193 cpu->bpu.num_pred = 2048 << bpu.pte;
194 }
195
196 READ_BCR(ARC_REG_AP_BCR, bcr);
197 cpu->extn.ap = bcr.ver ? 1 : 0;
198
199 READ_BCR(ARC_REG_SMART_BCR, bcr);
200 cpu->extn.smart = bcr.ver ? 1 : 0;
201
202 READ_BCR(ARC_REG_RTT_BCR, bcr);
203 cpu->extn.rtt = bcr.ver ? 1 : 0;
204
205 cpu->extn.debug = cpu->extn.ap | cpu->extn.smart | cpu->extn.rtt;
206
207 /* some hacks for lack of feature BCR info in old ARC700 cores */
208 if (is_isa_arcompact()) {
209 if (!cpu->isa.ver) /* ISA BCR absent, use Kconfig info */
210 cpu->isa.atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC);
211 else
212 cpu->isa.atomic = cpu->isa.atomic1;
213
214 cpu->isa.be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
215
216 /* there's no direct way to distinguish 750 vs. 770 */
217 if (unlikely(cpu->core.family < 0x34 || cpu->mmu.ver < 3))
218 cpu->name = "ARC750";
219 }
220}
221
222static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
223{
224 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
225 struct bcr_identity *core = &cpu->core;
226 int i, n = 0;
227
228 FIX_PTR(cpu);
229
230 n += scnprintf(buf + n, len - n,
231 "\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n",
232 core->family, core->cpu_id, core->chip_id);
233
234 n += scnprintf(buf + n, len - n, "processor [%d]\t: %s %s (%s ISA) %s\n",
235 cpu_id, cpu->name, cpu->details,
236 is_isa_arcompact() ? "ARCompact" : "ARCv2",
237 IS_AVAIL1(cpu->isa.be, "[Big-Endian]"));
238
239 n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s%s%s\nISA Extn\t: ",
240 IS_AVAIL1(cpu->extn.timer0, "Timer0 "),
241 IS_AVAIL1(cpu->extn.timer1, "Timer1 "),
242 IS_AVAIL2(cpu->extn.rtc, "RTC [UP 64-bit] ", CONFIG_ARC_TIMERS_64BIT),
243 IS_AVAIL2(cpu->extn.gfrc, "GFRC [SMP 64-bit] ", CONFIG_ARC_TIMERS_64BIT));
244
245 n += i = scnprintf(buf + n, len - n, "%s%s%s%s%s",
246 IS_AVAIL2(cpu->isa.atomic, "atomic ", CONFIG_ARC_HAS_LLSC),
247 IS_AVAIL2(cpu->isa.ldd, "ll64 ", CONFIG_ARC_HAS_LL64),
248 IS_AVAIL1(cpu->isa.unalign, "unalign (not used)"));
249
250 if (i)
251 n += scnprintf(buf + n, len - n, "\n\t\t: ");
252
253 if (cpu->extn_mpy.ver) {
254 if (cpu->extn_mpy.ver <= 0x2) { /* ARCompact */
255 n += scnprintf(buf + n, len - n, "mpy ");
256 } else {
257 int opt = 2; /* stock MPY/MPYH */
258
259 if (cpu->extn_mpy.dsp) /* OPT 7-9 */
260 opt = cpu->extn_mpy.dsp + 6;
261
262 n += scnprintf(buf + n, len - n, "mpy[opt %d] ", opt);
263 }
264 }
265
266 n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n",
267 IS_AVAIL1(cpu->isa.div_rem, "div_rem "),
268 IS_AVAIL1(cpu->extn.norm, "norm "),
269 IS_AVAIL1(cpu->extn.barrel, "barrel-shift "),
270 IS_AVAIL1(cpu->extn.swap, "swap "),
271 IS_AVAIL1(cpu->extn.minmax, "minmax "),
272 IS_AVAIL1(cpu->extn.crc, "crc "),
273 IS_AVAIL2(cpu->extn.swape, "swape", CONFIG_ARC_HAS_SWAPE));
274
275 if (cpu->bpu.ver)
276 n += scnprintf(buf + n, len - n,
277 "BPU\t\t: %s%s match, cache:%d, Predict Table:%d\n",
278 IS_AVAIL1(cpu->bpu.full, "full"),
279 IS_AVAIL1(!cpu->bpu.full, "partial"),
280 cpu->bpu.num_cache, cpu->bpu.num_pred);
281
282 return buf;
283}
284
285static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
286{
287 int n = 0;
288 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
289
290 FIX_PTR(cpu);
291
292 n += scnprintf(buf + n, len - n, "Vector Table\t: %#x\n", cpu->vec_base);
293
294 if (cpu->extn.fpu_sp || cpu->extn.fpu_dp)
295 n += scnprintf(buf + n, len - n, "FPU\t\t: %s%s\n",
296 IS_AVAIL1(cpu->extn.fpu_sp, "SP "),
297 IS_AVAIL1(cpu->extn.fpu_dp, "DP "));
298
299 if (cpu->extn.debug)
300 n += scnprintf(buf + n, len - n, "DEBUG\t\t: %s%s%s\n",
301 IS_AVAIL1(cpu->extn.ap, "ActionPoint "),
302 IS_AVAIL1(cpu->extn.smart, "smaRT "),
303 IS_AVAIL1(cpu->extn.rtt, "RTT "));
304
305 if (cpu->dccm.sz || cpu->iccm.sz)
306 n += scnprintf(buf + n, len - n, "Extn [CCM]\t: DCCM @ %x, %d KB / ICCM: @ %x, %d KB\n",
307 cpu->dccm.base_addr, TO_KB(cpu->dccm.sz),
308 cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
309
310 n += scnprintf(buf + n, len - n, "OS ABI [v%d]\t: %s\n",
311 EF_ARC_OSABI_CURRENT >> 8,
312 EF_ARC_OSABI_CURRENT == EF_ARC_OSABI_V3 ?
313 "no-legacy-syscalls" : "64-bit data any register aligned");
314
315 return buf;
316}
317
318static void arc_chk_core_config(void)
319{
320 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
321 int fpu_enabled;
322
323 if (!cpu->extn.timer0)
324 panic("Timer0 is not present!\n");
325
326 if (!cpu->extn.timer1)
327 panic("Timer1 is not present!\n");
328
329#ifdef CONFIG_ARC_HAS_DCCM
330 /*
331 * DCCM can be arbit placed in hardware.
332 * Make sure it's placement/sz matches what Linux is built with
333 */
334 if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
335 panic("Linux built with incorrect DCCM Base address\n");
336
337 if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
338 panic("Linux built with incorrect DCCM Size\n");
339#endif
340
341#ifdef CONFIG_ARC_HAS_ICCM
342 if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
343 panic("Linux built with incorrect ICCM Size\n");
344#endif
345
346 /*
347 * FP hardware/software config sanity
348 * -If hardware contains DPFP, kernel needs to save/restore FPU state
349 * -If not, it will crash trying to save/restore the non-existant regs
350 *
351 * (only DPDP checked since SP has no arch visible regs)
352 */
353 fpu_enabled = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE);
354
355 if (cpu->extn.fpu_dp && !fpu_enabled)
356 pr_warn("CONFIG_ARC_FPU_SAVE_RESTORE needed for working apps\n");
357 else if (!cpu->extn.fpu_dp && fpu_enabled)
358 panic("FPU non-existent, disable CONFIG_ARC_FPU_SAVE_RESTORE\n");
359}
360
361/*
362 * Initialize and setup the processor core
363 * This is called by all the CPUs thus should not do special case stuff
364 * such as only for boot CPU etc
365 */
366
367void setup_processor(void)
368{
369 char str[512];
370 int cpu_id = smp_processor_id();
371
372 read_arc_build_cfg_regs();
373 arc_init_IRQ();
374
375 printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
376
377 arc_mmu_init();
378 arc_cache_init();
379
380 printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
381 printk(arc_platform_smp_cpuinfo());
382
383 arc_chk_core_config();
384}
385
386static inline int is_kernel(unsigned long addr)
387{
388 if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end)
389 return 1;
390 return 0;
391}
392
393void __init setup_arch(char **cmdline_p)
394{
395#ifdef CONFIG_ARC_UBOOT_SUPPORT
396 /* make sure that uboot passed pointer to cmdline/dtb is valid */
397 if (uboot_tag && is_kernel((unsigned long)uboot_arg))
398 panic("Invalid uboot arg\n");
399
400 /* See if u-boot passed an external Device Tree blob */
401 machine_desc = setup_machine_fdt(uboot_arg); /* uboot_tag == 2 */
402 if (!machine_desc)
403#endif
404 {
405 /* No, so try the embedded one */
406 machine_desc = setup_machine_fdt(__dtb_start);
407 if (!machine_desc)
408 panic("Embedded DT invalid\n");
409
410 /*
411 * If we are here, it is established that @uboot_arg didn't
412 * point to DT blob. Instead if u-boot says it is cmdline,
413 * append to embedded DT cmdline.
414 * setup_machine_fdt() would have populated @boot_command_line
415 */
416 if (uboot_tag == 1) {
417 /* Ensure a whitespace between the 2 cmdlines */
418 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
419 strlcat(boot_command_line, uboot_arg,
420 COMMAND_LINE_SIZE);
421 }
422 }
423
424 /* Save unparsed command line copy for /proc/cmdline */
425 *cmdline_p = boot_command_line;
426
427 /* To force early parsing of things like mem=xxx */
428 parse_early_param();
429
430 /* Platform/board specific: e.g. early console registration */
431 if (machine_desc->init_early)
432 machine_desc->init_early();
433
434 smp_init_cpus();
435
436 setup_processor();
437 setup_arch_memory();
438
439 /* copy flat DT out of .init and then unflatten it */
440 unflatten_and_copy_device_tree();
441
442 /* Can be issue if someone passes cmd line arg "ro"
443 * But that is unlikely so keeping it as it is
444 */
445 root_mountflags &= ~MS_RDONLY;
446
447#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
448 conswitchp = &dummy_con;
449#endif
450
451 arc_unwind_init();
452}
453
454/*
455 * Called from start_kernel() - boot CPU only
456 */
457void __init time_init(void)
458{
459 of_clk_init(NULL);
460 clocksource_probe();
461}
462
463static int __init customize_machine(void)
464{
465 if (machine_desc->init_machine)
466 machine_desc->init_machine();
467
468 return 0;
469}
470arch_initcall(customize_machine);
471
472static int __init init_late_machine(void)
473{
474 if (machine_desc->init_late)
475 machine_desc->init_late();
476
477 return 0;
478}
479late_initcall(init_late_machine);
480/*
481 * Get CPU information for use by the procfs.
482 */
483
484#define cpu_to_ptr(c) ((void *)(0xFFFF0000 | (unsigned int)(c)))
485#define ptr_to_cpu(p) (~0xFFFF0000UL & (unsigned int)(p))
486
487static int show_cpuinfo(struct seq_file *m, void *v)
488{
489 char *str;
490 int cpu_id = ptr_to_cpu(v);
491 struct device_node *core_clk = of_find_node_by_name(NULL, "core_clk");
492 u32 freq = 0;
493
494 if (!cpu_online(cpu_id)) {
495 seq_printf(m, "processor [%d]\t: Offline\n", cpu_id);
496 goto done;
497 }
498
499 str = (char *)__get_free_page(GFP_TEMPORARY);
500 if (!str)
501 goto done;
502
503 seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
504
505 of_property_read_u32(core_clk, "clock-frequency", &freq);
506 if (freq)
507 seq_printf(m, "CPU speed\t: %u.%02u Mhz\n",
508 freq / 1000000, (freq / 10000) % 100);
509
510 seq_printf(m, "Bogo MIPS\t: %lu.%02lu\n",
511 loops_per_jiffy / (500000 / HZ),
512 (loops_per_jiffy / (5000 / HZ)) % 100);
513
514 seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
515 seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
516 seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
517 seq_printf(m, arc_platform_smp_cpuinfo());
518
519 free_page((unsigned long)str);
520done:
521 seq_printf(m, "\n");
522
523 return 0;
524}
525
526static void *c_start(struct seq_file *m, loff_t *pos)
527{
528 /*
529 * Callback returns cpu-id to iterator for show routine, NULL to stop.
530 * However since NULL is also a valid cpu-id (0), we use a round-about
531 * way to pass it w/o having to kmalloc/free a 2 byte string.
532 * Encode cpu-id as 0xFFcccc, which is decoded by show routine.
533 */
534 return *pos < nr_cpu_ids ? cpu_to_ptr(*pos) : NULL;
535}
536
537static void *c_next(struct seq_file *m, void *v, loff_t *pos)
538{
539 ++*pos;
540 return c_start(m, pos);
541}
542
543static void c_stop(struct seq_file *m, void *v)
544{
545}
546
547const struct seq_operations cpuinfo_op = {
548 .start = c_start,
549 .next = c_next,
550 .stop = c_stop,
551 .show = show_cpuinfo
552};
553
554static DEFINE_PER_CPU(struct cpu, cpu_topology);
555
556static int __init topology_init(void)
557{
558 int cpu;
559
560 for_each_present_cpu(cpu)
561 register_cpu(&per_cpu(cpu_topology, cpu), cpu);
562
563 return 0;
564}
565
566subsys_initcall(topology_init);