Loading...
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/clk-provider.h>
12#include <linux/clocksource.h>
13#include <linux/console.h>
14#include <linux/module.h>
15#include <linux/cpu.h>
16#include <linux/of_fdt.h>
17#include <linux/of.h>
18#include <linux/cache.h>
19#include <uapi/linux/mount.h>
20#include <asm/sections.h>
21#include <asm/arcregs.h>
22#include <asm/tlb.h>
23#include <asm/setup.h>
24#include <asm/page.h>
25#include <asm/irq.h>
26#include <asm/unwind.h>
27#include <asm/mach_desc.h>
28#include <asm/smp.h>
29
30#define FIX_PTR(x) __asm__ __volatile__(";" : "+r"(x))
31
32unsigned int intr_to_DE_cnt;
33
34/* Part of U-boot ABI: see head.S */
35int __initdata uboot_tag;
36int __initdata uboot_magic;
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_legacy_rel[] = {
46 /* ID.ARCVER, Release */
47#ifdef CONFIG_ISA_ARCOMPACT
48 { 0x34, "R4.10"},
49 { 0x35, "R4.11"},
50#else
51 { 0x51, "R2.0" },
52 { 0x52, "R2.1" },
53 { 0x53, "R3.0" },
54#endif
55 { 0x00, NULL }
56};
57
58static const struct id_to_str arc_cpu_rel[] = {
59 /* UARCH.MAJOR, Release */
60 { 0, "R3.10a"},
61 { 1, "R3.50a"},
62 { 0xFF, NULL }
63};
64
65static void read_decode_ccm_bcr(struct cpuinfo_arc *cpu)
66{
67 if (is_isa_arcompact()) {
68 struct bcr_iccm_arcompact iccm;
69 struct bcr_dccm_arcompact dccm;
70
71 READ_BCR(ARC_REG_ICCM_BUILD, iccm);
72 if (iccm.ver) {
73 cpu->iccm.sz = 4096 << iccm.sz; /* 8K to 512K */
74 cpu->iccm.base_addr = iccm.base << 16;
75 }
76
77 READ_BCR(ARC_REG_DCCM_BUILD, dccm);
78 if (dccm.ver) {
79 unsigned long base;
80 cpu->dccm.sz = 2048 << dccm.sz; /* 2K to 256K */
81
82 base = read_aux_reg(ARC_REG_DCCM_BASE_BUILD);
83 cpu->dccm.base_addr = base & ~0xF;
84 }
85 } else {
86 struct bcr_iccm_arcv2 iccm;
87 struct bcr_dccm_arcv2 dccm;
88 unsigned long region;
89
90 READ_BCR(ARC_REG_ICCM_BUILD, iccm);
91 if (iccm.ver) {
92 cpu->iccm.sz = 256 << iccm.sz00; /* 512B to 16M */
93 if (iccm.sz00 == 0xF && iccm.sz01 > 0)
94 cpu->iccm.sz <<= iccm.sz01;
95
96 region = read_aux_reg(ARC_REG_AUX_ICCM);
97 cpu->iccm.base_addr = region & 0xF0000000;
98 }
99
100 READ_BCR(ARC_REG_DCCM_BUILD, dccm);
101 if (dccm.ver) {
102 cpu->dccm.sz = 256 << dccm.sz0;
103 if (dccm.sz0 == 0xF && dccm.sz1 > 0)
104 cpu->dccm.sz <<= dccm.sz1;
105
106 region = read_aux_reg(ARC_REG_AUX_DCCM);
107 cpu->dccm.base_addr = region & 0xF0000000;
108 }
109 }
110}
111
112static void decode_arc_core(struct cpuinfo_arc *cpu)
113{
114 struct bcr_uarch_build_arcv2 uarch;
115 const struct id_to_str *tbl;
116
117 /*
118 * Up until (including) the first core4 release (0x54) things were
119 * simple: AUX IDENTITY.ARCVER was sufficient to identify arc family
120 * and release: 0x50 to 0x53 was HS38, 0x54 was HS48 (dual issue)
121 */
122
123 if (cpu->core.family < 0x54) { /* includes arc700 */
124
125 for (tbl = &arc_legacy_rel[0]; tbl->id != 0; tbl++) {
126 if (cpu->core.family == tbl->id) {
127 cpu->release = tbl->str;
128 break;
129 }
130 }
131
132 if (is_isa_arcompact())
133 cpu->name = "ARC700";
134 else if (tbl->str)
135 cpu->name = "HS38";
136 else
137 cpu->name = cpu->release = "Unknown";
138
139 return;
140 }
141
142 /*
143 * However the subsequent HS release (same 0x54) allow HS38 or HS48
144 * configurations and encode this info in a different BCR.
145 * The BCR was introduced in 0x54 so can't be read unconditionally.
146 */
147
148 READ_BCR(ARC_REG_MICRO_ARCH_BCR, uarch);
149
150 if (uarch.prod == 4) {
151 cpu->name = "HS48";
152 cpu->extn.dual = 1;
153
154 } else {
155 cpu->name = "HS38";
156 }
157
158 for (tbl = &arc_cpu_rel[0]; tbl->id != 0xFF; tbl++) {
159 if (uarch.maj == tbl->id) {
160 cpu->release = tbl->str;
161 break;
162 }
163 }
164}
165
166static void read_arc_build_cfg_regs(void)
167{
168 struct bcr_timer timer;
169 struct bcr_generic bcr;
170 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
171 struct bcr_isa_arcv2 isa;
172 struct bcr_actionpoint ap;
173
174 FIX_PTR(cpu);
175
176 READ_BCR(AUX_IDENTITY, cpu->core);
177 decode_arc_core(cpu);
178
179 READ_BCR(ARC_REG_TIMERS_BCR, timer);
180 cpu->extn.timer0 = timer.t0;
181 cpu->extn.timer1 = timer.t1;
182 cpu->extn.rtc = timer.rtc;
183
184 cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
185
186 READ_BCR(ARC_REG_MUL_BCR, cpu->extn_mpy);
187
188 /* Read CCM BCRs for boot reporting even if not enabled in Kconfig */
189 read_decode_ccm_bcr(cpu);
190
191 read_decode_mmu_bcr();
192 read_decode_cache_bcr();
193
194 if (is_isa_arcompact()) {
195 struct bcr_fp_arcompact sp, dp;
196 struct bcr_bpu_arcompact bpu;
197
198 READ_BCR(ARC_REG_FP_BCR, sp);
199 READ_BCR(ARC_REG_DPFP_BCR, dp);
200 cpu->extn.fpu_sp = sp.ver ? 1 : 0;
201 cpu->extn.fpu_dp = dp.ver ? 1 : 0;
202
203 READ_BCR(ARC_REG_BPU_BCR, bpu);
204 cpu->bpu.ver = bpu.ver;
205 cpu->bpu.full = bpu.fam ? 1 : 0;
206 if (bpu.ent) {
207 cpu->bpu.num_cache = 256 << (bpu.ent - 1);
208 cpu->bpu.num_pred = 256 << (bpu.ent - 1);
209 }
210 } else {
211 struct bcr_fp_arcv2 spdp;
212 struct bcr_bpu_arcv2 bpu;
213
214 READ_BCR(ARC_REG_FP_V2_BCR, spdp);
215 cpu->extn.fpu_sp = spdp.sp ? 1 : 0;
216 cpu->extn.fpu_dp = spdp.dp ? 1 : 0;
217
218 READ_BCR(ARC_REG_BPU_BCR, bpu);
219 cpu->bpu.ver = bpu.ver;
220 cpu->bpu.full = bpu.ft;
221 cpu->bpu.num_cache = 256 << bpu.bce;
222 cpu->bpu.num_pred = 2048 << bpu.pte;
223 cpu->bpu.ret_stk = 4 << bpu.rse;
224
225 /* if dual issue hardware, is it enabled ? */
226 if (cpu->extn.dual) {
227 unsigned int exec_ctrl;
228
229 READ_BCR(AUX_EXEC_CTRL, exec_ctrl);
230 cpu->extn.dual_enb = !(exec_ctrl & 1);
231 }
232 }
233
234 READ_BCR(ARC_REG_AP_BCR, ap);
235 if (ap.ver) {
236 cpu->extn.ap_num = 2 << ap.num;
237 cpu->extn.ap_full = !ap.min;
238 }
239
240 READ_BCR(ARC_REG_SMART_BCR, bcr);
241 cpu->extn.smart = bcr.ver ? 1 : 0;
242
243 READ_BCR(ARC_REG_RTT_BCR, bcr);
244 cpu->extn.rtt = bcr.ver ? 1 : 0;
245
246 READ_BCR(ARC_REG_ISA_CFG_BCR, isa);
247
248 /* some hacks for lack of feature BCR info in old ARC700 cores */
249 if (is_isa_arcompact()) {
250 if (!isa.ver) /* ISA BCR absent, use Kconfig info */
251 cpu->isa.atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC);
252 else {
253 /* ARC700_BUILD only has 2 bits of isa info */
254 struct bcr_generic bcr = *(struct bcr_generic *)&isa;
255 cpu->isa.atomic = bcr.info & 1;
256 }
257
258 cpu->isa.be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
259
260 /* there's no direct way to distinguish 750 vs. 770 */
261 if (unlikely(cpu->core.family < 0x34 || cpu->mmu.ver < 3))
262 cpu->name = "ARC750";
263 } else {
264 cpu->isa = isa;
265 }
266}
267
268static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
269{
270 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
271 struct bcr_identity *core = &cpu->core;
272 char mpy_opt[16];
273 int n = 0;
274
275 FIX_PTR(cpu);
276
277 n += scnprintf(buf + n, len - n,
278 "\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n",
279 core->family, core->cpu_id, core->chip_id);
280
281 n += scnprintf(buf + n, len - n, "processor [%d]\t: %s %s (%s ISA) %s%s%s\n",
282 cpu_id, cpu->name, cpu->release,
283 is_isa_arcompact() ? "ARCompact" : "ARCv2",
284 IS_AVAIL1(cpu->isa.be, "[Big-Endian]"),
285 IS_AVAIL3(cpu->extn.dual, cpu->extn.dual_enb, " Dual-Issue "));
286
287 n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s%s%s\nISA Extn\t: ",
288 IS_AVAIL1(cpu->extn.timer0, "Timer0 "),
289 IS_AVAIL1(cpu->extn.timer1, "Timer1 "),
290 IS_AVAIL2(cpu->extn.rtc, "RTC [UP 64-bit] ", CONFIG_ARC_TIMERS_64BIT),
291 IS_AVAIL2(cpu->extn.gfrc, "GFRC [SMP 64-bit] ", CONFIG_ARC_TIMERS_64BIT));
292
293 if (cpu->extn_mpy.ver) {
294 if (is_isa_arcompact()) {
295 scnprintf(mpy_opt, 16, "mpy");
296 } else {
297
298 int opt = 2; /* stock MPY/MPYH */
299
300 if (cpu->extn_mpy.dsp) /* OPT 7-9 */
301 opt = cpu->extn_mpy.dsp + 6;
302
303 scnprintf(mpy_opt, 16, "mpy[opt %d] ", opt);
304 }
305 }
306
307 n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n",
308 IS_AVAIL2(cpu->isa.atomic, "atomic ", CONFIG_ARC_HAS_LLSC),
309 IS_AVAIL2(cpu->isa.ldd, "ll64 ", CONFIG_ARC_HAS_LL64),
310 IS_AVAIL2(cpu->isa.unalign, "unalign ", CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS),
311 IS_AVAIL1(cpu->extn_mpy.ver, mpy_opt),
312 IS_AVAIL1(cpu->isa.div_rem, "div_rem "));
313
314 if (cpu->bpu.ver) {
315 n += scnprintf(buf + n, len - n,
316 "BPU\t\t: %s%s match, cache:%d, Predict Table:%d Return stk: %d",
317 IS_AVAIL1(cpu->bpu.full, "full"),
318 IS_AVAIL1(!cpu->bpu.full, "partial"),
319 cpu->bpu.num_cache, cpu->bpu.num_pred, cpu->bpu.ret_stk);
320
321 if (is_isa_arcv2()) {
322 struct bcr_lpb lpb;
323
324 READ_BCR(ARC_REG_LPB_BUILD, lpb);
325 if (lpb.ver) {
326 unsigned int ctl;
327 ctl = read_aux_reg(ARC_REG_LPB_CTRL);
328
329 n += scnprintf(buf + n, len - n, " Loop Buffer:%d %s",
330 lpb.entries,
331 IS_DISABLED_RUN(!ctl));
332 }
333 }
334 n += scnprintf(buf + n, len - n, "\n");
335 }
336
337 return buf;
338}
339
340static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
341{
342 int n = 0;
343 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
344
345 FIX_PTR(cpu);
346
347 n += scnprintf(buf + n, len - n, "Vector Table\t: %#x\n", cpu->vec_base);
348
349 if (cpu->extn.fpu_sp || cpu->extn.fpu_dp)
350 n += scnprintf(buf + n, len - n, "FPU\t\t: %s%s\n",
351 IS_AVAIL1(cpu->extn.fpu_sp, "SP "),
352 IS_AVAIL1(cpu->extn.fpu_dp, "DP "));
353
354 if (cpu->extn.ap_num | cpu->extn.smart | cpu->extn.rtt) {
355 n += scnprintf(buf + n, len - n, "DEBUG\t\t: %s%s",
356 IS_AVAIL1(cpu->extn.smart, "smaRT "),
357 IS_AVAIL1(cpu->extn.rtt, "RTT "));
358 if (cpu->extn.ap_num) {
359 n += scnprintf(buf + n, len - n, "ActionPoint %d/%s",
360 cpu->extn.ap_num,
361 cpu->extn.ap_full ? "full":"min");
362 }
363 n += scnprintf(buf + n, len - n, "\n");
364 }
365
366 if (cpu->dccm.sz || cpu->iccm.sz)
367 n += scnprintf(buf + n, len - n, "Extn [CCM]\t: DCCM @ %x, %d KB / ICCM: @ %x, %d KB\n",
368 cpu->dccm.base_addr, TO_KB(cpu->dccm.sz),
369 cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
370
371 if (is_isa_arcv2()) {
372
373 /* Error Protection: ECC/Parity */
374 struct bcr_erp erp;
375 READ_BCR(ARC_REG_ERP_BUILD, erp);
376
377 if (erp.ver) {
378 struct ctl_erp ctl;
379 READ_BCR(ARC_REG_ERP_CTRL, ctl);
380
381 /* inverted bits: 0 means enabled */
382 n += scnprintf(buf + n, len - n, "Extn [ECC]\t: %s%s%s%s%s%s\n",
383 IS_AVAIL3(erp.ic, !ctl.dpi, "IC "),
384 IS_AVAIL3(erp.dc, !ctl.dpd, "DC "),
385 IS_AVAIL3(erp.mmu, !ctl.mpd, "MMU "));
386 }
387 }
388
389 return buf;
390}
391
392static void arc_chk_core_config(void)
393{
394 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
395 int saved = 0, present = 0;
396 char *opt_nm = NULL;
397
398 if (!cpu->extn.timer0)
399 panic("Timer0 is not present!\n");
400
401 if (!cpu->extn.timer1)
402 panic("Timer1 is not present!\n");
403
404#ifdef CONFIG_ARC_HAS_DCCM
405 /*
406 * DCCM can be arbit placed in hardware.
407 * Make sure it's placement/sz matches what Linux is built with
408 */
409 if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
410 panic("Linux built with incorrect DCCM Base address\n");
411
412 if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
413 panic("Linux built with incorrect DCCM Size\n");
414#endif
415
416#ifdef CONFIG_ARC_HAS_ICCM
417 if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
418 panic("Linux built with incorrect ICCM Size\n");
419#endif
420
421 /*
422 * FP hardware/software config sanity
423 * -If hardware present, kernel needs to save/restore FPU state
424 * -If not, it will crash trying to save/restore the non-existant regs
425 */
426
427 if (is_isa_arcompact()) {
428 opt_nm = "CONFIG_ARC_FPU_SAVE_RESTORE";
429 saved = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE);
430
431 /* only DPDP checked since SP has no arch visible regs */
432 present = cpu->extn.fpu_dp;
433 } else {
434 opt_nm = "CONFIG_ARC_HAS_ACCL_REGS";
435 saved = IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS);
436
437 /* Accumulator Low:High pair (r58:59) present if DSP MPY or FPU */
438 present = cpu->extn_mpy.dsp | cpu->extn.fpu_sp | cpu->extn.fpu_dp;
439 }
440
441 if (present && !saved)
442 pr_warn("Enable %s for working apps\n", opt_nm);
443 else if (!present && saved)
444 panic("Disable %s, hardware NOT present\n", opt_nm);
445}
446
447/*
448 * Initialize and setup the processor core
449 * This is called by all the CPUs thus should not do special case stuff
450 * such as only for boot CPU etc
451 */
452
453void setup_processor(void)
454{
455 char str[512];
456 int cpu_id = smp_processor_id();
457
458 read_arc_build_cfg_regs();
459 arc_init_IRQ();
460
461 pr_info("%s", arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
462
463 arc_mmu_init();
464 arc_cache_init();
465
466 pr_info("%s", arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
467 pr_info("%s", arc_platform_smp_cpuinfo());
468
469 arc_chk_core_config();
470}
471
472static inline bool uboot_arg_invalid(unsigned long addr)
473{
474 /*
475 * Check that it is a untranslated address (although MMU is not enabled
476 * yet, it being a high address ensures this is not by fluke)
477 */
478 if (addr < PAGE_OFFSET)
479 return true;
480
481 /* Check that address doesn't clobber resident kernel image */
482 return addr >= (unsigned long)_stext && addr <= (unsigned long)_end;
483}
484
485#define IGNORE_ARGS "Ignore U-boot args: "
486
487/* uboot_tag values for U-boot - kernel ABI revision 0; see head.S */
488#define UBOOT_TAG_NONE 0
489#define UBOOT_TAG_CMDLINE 1
490#define UBOOT_TAG_DTB 2
491/* We always pass 0 as magic from U-boot */
492#define UBOOT_MAGIC_VALUE 0
493
494void __init handle_uboot_args(void)
495{
496 bool use_embedded_dtb = true;
497 bool append_cmdline = false;
498
499 /* check that we know this tag */
500 if (uboot_tag != UBOOT_TAG_NONE &&
501 uboot_tag != UBOOT_TAG_CMDLINE &&
502 uboot_tag != UBOOT_TAG_DTB) {
503 pr_warn(IGNORE_ARGS "invalid uboot tag: '%08x'\n", uboot_tag);
504 goto ignore_uboot_args;
505 }
506
507 if (uboot_magic != UBOOT_MAGIC_VALUE) {
508 pr_warn(IGNORE_ARGS "non zero uboot magic\n");
509 goto ignore_uboot_args;
510 }
511
512 if (uboot_tag != UBOOT_TAG_NONE &&
513 uboot_arg_invalid((unsigned long)uboot_arg)) {
514 pr_warn(IGNORE_ARGS "invalid uboot arg: '%px'\n", uboot_arg);
515 goto ignore_uboot_args;
516 }
517
518 /* see if U-boot passed an external Device Tree blob */
519 if (uboot_tag == UBOOT_TAG_DTB) {
520 machine_desc = setup_machine_fdt((void *)uboot_arg);
521
522 /* external Device Tree blob is invalid - use embedded one */
523 use_embedded_dtb = !machine_desc;
524 }
525
526 if (uboot_tag == UBOOT_TAG_CMDLINE)
527 append_cmdline = true;
528
529ignore_uboot_args:
530
531 if (use_embedded_dtb) {
532 machine_desc = setup_machine_fdt(__dtb_start);
533 if (!machine_desc)
534 panic("Embedded DT invalid\n");
535 }
536
537 /*
538 * NOTE: @boot_command_line is populated by setup_machine_fdt() so this
539 * append processing can only happen after.
540 */
541 if (append_cmdline) {
542 /* Ensure a whitespace between the 2 cmdlines */
543 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
544 strlcat(boot_command_line, uboot_arg, COMMAND_LINE_SIZE);
545 }
546}
547
548void __init setup_arch(char **cmdline_p)
549{
550 handle_uboot_args();
551
552 /* Save unparsed command line copy for /proc/cmdline */
553 *cmdline_p = boot_command_line;
554
555 /* To force early parsing of things like mem=xxx */
556 parse_early_param();
557
558 /* Platform/board specific: e.g. early console registration */
559 if (machine_desc->init_early)
560 machine_desc->init_early();
561
562 smp_init_cpus();
563
564 setup_processor();
565 setup_arch_memory();
566
567 /* copy flat DT out of .init and then unflatten it */
568 unflatten_and_copy_device_tree();
569
570 /* Can be issue if someone passes cmd line arg "ro"
571 * But that is unlikely so keeping it as it is
572 */
573 root_mountflags &= ~MS_RDONLY;
574
575#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
576 conswitchp = &dummy_con;
577#endif
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/console.h>
14#include <linux/module.h>
15#include <linux/cpu.h>
16#include <linux/clk-provider.h>
17#include <linux/of_fdt.h>
18#include <linux/of_platform.h>
19#include <linux/cache.h>
20#include <asm/sections.h>
21#include <asm/arcregs.h>
22#include <asm/tlb.h>
23#include <asm/setup.h>
24#include <asm/page.h>
25#include <asm/irq.h>
26#include <asm/unwind.h>
27#include <asm/clk.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 void read_decode_ccm_bcr(struct cpuinfo_arc *cpu)
46{
47 if (is_isa_arcompact()) {
48 struct bcr_iccm_arcompact iccm;
49 struct bcr_dccm_arcompact dccm;
50
51 READ_BCR(ARC_REG_ICCM_BUILD, iccm);
52 if (iccm.ver) {
53 cpu->iccm.sz = 4096 << iccm.sz; /* 8K to 512K */
54 cpu->iccm.base_addr = iccm.base << 16;
55 }
56
57 READ_BCR(ARC_REG_DCCM_BUILD, dccm);
58 if (dccm.ver) {
59 unsigned long base;
60 cpu->dccm.sz = 2048 << dccm.sz; /* 2K to 256K */
61
62 base = read_aux_reg(ARC_REG_DCCM_BASE_BUILD);
63 cpu->dccm.base_addr = base & ~0xF;
64 }
65 } else {
66 struct bcr_iccm_arcv2 iccm;
67 struct bcr_dccm_arcv2 dccm;
68 unsigned long region;
69
70 READ_BCR(ARC_REG_ICCM_BUILD, iccm);
71 if (iccm.ver) {
72 cpu->iccm.sz = 256 << iccm.sz00; /* 512B to 16M */
73 if (iccm.sz00 == 0xF && iccm.sz01 > 0)
74 cpu->iccm.sz <<= iccm.sz01;
75
76 region = read_aux_reg(ARC_REG_AUX_ICCM);
77 cpu->iccm.base_addr = region & 0xF0000000;
78 }
79
80 READ_BCR(ARC_REG_DCCM_BUILD, dccm);
81 if (dccm.ver) {
82 cpu->dccm.sz = 256 << dccm.sz0;
83 if (dccm.sz0 == 0xF && dccm.sz1 > 0)
84 cpu->dccm.sz <<= dccm.sz1;
85
86 region = read_aux_reg(ARC_REG_AUX_DCCM);
87 cpu->dccm.base_addr = region & 0xF0000000;
88 }
89 }
90}
91
92static void read_arc_build_cfg_regs(void)
93{
94 struct bcr_timer timer;
95 struct bcr_generic bcr;
96 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
97 FIX_PTR(cpu);
98
99 READ_BCR(AUX_IDENTITY, cpu->core);
100 READ_BCR(ARC_REG_ISA_CFG_BCR, cpu->isa);
101
102 READ_BCR(ARC_REG_TIMERS_BCR, timer);
103 cpu->extn.timer0 = timer.t0;
104 cpu->extn.timer1 = timer.t1;
105 cpu->extn.rtc = timer.rtc;
106
107 cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
108
109 READ_BCR(ARC_REG_MUL_BCR, cpu->extn_mpy);
110
111 cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR) > 1 ? 1 : 0; /* 2,3 */
112 cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR) > 1 ? 1 : 0; /* 2,3 */
113 cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR) ? 1 : 0; /* 1,3 */
114 cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR) ? 1 : 0;
115 cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR) > 1 ? 1 : 0; /* 2 */
116 READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem);
117
118 /* Read CCM BCRs for boot reporting even if not enabled in Kconfig */
119 read_decode_ccm_bcr(cpu);
120
121 read_decode_mmu_bcr();
122 read_decode_cache_bcr();
123
124 if (is_isa_arcompact()) {
125 struct bcr_fp_arcompact sp, dp;
126 struct bcr_bpu_arcompact bpu;
127
128 READ_BCR(ARC_REG_FP_BCR, sp);
129 READ_BCR(ARC_REG_DPFP_BCR, dp);
130 cpu->extn.fpu_sp = sp.ver ? 1 : 0;
131 cpu->extn.fpu_dp = dp.ver ? 1 : 0;
132
133 READ_BCR(ARC_REG_BPU_BCR, bpu);
134 cpu->bpu.ver = bpu.ver;
135 cpu->bpu.full = bpu.fam ? 1 : 0;
136 if (bpu.ent) {
137 cpu->bpu.num_cache = 256 << (bpu.ent - 1);
138 cpu->bpu.num_pred = 256 << (bpu.ent - 1);
139 }
140 } else {
141 struct bcr_fp_arcv2 spdp;
142 struct bcr_bpu_arcv2 bpu;
143
144 READ_BCR(ARC_REG_FP_V2_BCR, spdp);
145 cpu->extn.fpu_sp = spdp.sp ? 1 : 0;
146 cpu->extn.fpu_dp = spdp.dp ? 1 : 0;
147
148 READ_BCR(ARC_REG_BPU_BCR, bpu);
149 cpu->bpu.ver = bpu.ver;
150 cpu->bpu.full = bpu.ft;
151 cpu->bpu.num_cache = 256 << bpu.bce;
152 cpu->bpu.num_pred = 2048 << bpu.pte;
153 }
154
155 READ_BCR(ARC_REG_AP_BCR, bcr);
156 cpu->extn.ap = bcr.ver ? 1 : 0;
157
158 READ_BCR(ARC_REG_SMART_BCR, bcr);
159 cpu->extn.smart = bcr.ver ? 1 : 0;
160
161 READ_BCR(ARC_REG_RTT_BCR, bcr);
162 cpu->extn.rtt = bcr.ver ? 1 : 0;
163
164 cpu->extn.debug = cpu->extn.ap | cpu->extn.smart | cpu->extn.rtt;
165}
166
167static const struct cpuinfo_data arc_cpu_tbl[] = {
168#ifdef CONFIG_ISA_ARCOMPACT
169 { {0x20, "ARC 600" }, 0x2F},
170 { {0x30, "ARC 700" }, 0x33},
171 { {0x34, "ARC 700 R4.10"}, 0x34},
172 { {0x35, "ARC 700 R4.11"}, 0x35},
173#else
174 { {0x50, "ARC HS38 R2.0"}, 0x51},
175 { {0x52, "ARC HS38 R2.1"}, 0x52},
176#endif
177 { {0x00, NULL } }
178};
179
180
181static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
182{
183 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
184 struct bcr_identity *core = &cpu->core;
185 const struct cpuinfo_data *tbl;
186 char *isa_nm;
187 int i, be, atomic;
188 int n = 0;
189
190 FIX_PTR(cpu);
191
192 if (is_isa_arcompact()) {
193 isa_nm = "ARCompact";
194 be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
195
196 atomic = cpu->isa.atomic1;
197 if (!cpu->isa.ver) /* ISA BCR absent, use Kconfig info */
198 atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC);
199 } else {
200 isa_nm = "ARCv2";
201 be = cpu->isa.be;
202 atomic = cpu->isa.atomic;
203 }
204
205 n += scnprintf(buf + n, len - n,
206 "\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n",
207 core->family, core->cpu_id, core->chip_id);
208
209 for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) {
210 if ((core->family >= tbl->info.id) &&
211 (core->family <= tbl->up_range)) {
212 n += scnprintf(buf + n, len - n,
213 "processor [%d]\t: %s (%s ISA) %s\n",
214 cpu_id, tbl->info.str, isa_nm,
215 IS_AVAIL1(be, "[Big-Endian]"));
216 break;
217 }
218 }
219
220 if (tbl->info.id == 0)
221 n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n");
222
223 n += scnprintf(buf + n, len - n, "CPU speed\t: %u.%02u Mhz\n",
224 (unsigned int)(arc_get_core_freq() / 1000000),
225 (unsigned int)(arc_get_core_freq() / 10000) % 100);
226
227 n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s\nISA Extn\t: ",
228 IS_AVAIL1(cpu->extn.timer0, "Timer0 "),
229 IS_AVAIL1(cpu->extn.timer1, "Timer1 "),
230 IS_AVAIL2(cpu->extn.rtc, "Local-64-bit-Ctr ",
231 CONFIG_ARC_HAS_RTC));
232
233 n += i = scnprintf(buf + n, len - n, "%s%s%s%s%s",
234 IS_AVAIL2(atomic, "atomic ", CONFIG_ARC_HAS_LLSC),
235 IS_AVAIL2(cpu->isa.ldd, "ll64 ", CONFIG_ARC_HAS_LL64),
236 IS_AVAIL1(cpu->isa.unalign, "unalign (not used)"));
237
238 if (i)
239 n += scnprintf(buf + n, len - n, "\n\t\t: ");
240
241 if (cpu->extn_mpy.ver) {
242 if (cpu->extn_mpy.ver <= 0x2) { /* ARCompact */
243 n += scnprintf(buf + n, len - n, "mpy ");
244 } else {
245 int opt = 2; /* stock MPY/MPYH */
246
247 if (cpu->extn_mpy.dsp) /* OPT 7-9 */
248 opt = cpu->extn_mpy.dsp + 6;
249
250 n += scnprintf(buf + n, len - n, "mpy[opt %d] ", opt);
251 }
252 }
253
254 n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n",
255 IS_AVAIL1(cpu->isa.div_rem, "div_rem "),
256 IS_AVAIL1(cpu->extn.norm, "norm "),
257 IS_AVAIL1(cpu->extn.barrel, "barrel-shift "),
258 IS_AVAIL1(cpu->extn.swap, "swap "),
259 IS_AVAIL1(cpu->extn.minmax, "minmax "),
260 IS_AVAIL1(cpu->extn.crc, "crc "),
261 IS_AVAIL2(1, "swape", CONFIG_ARC_HAS_SWAPE));
262
263 if (cpu->bpu.ver)
264 n += scnprintf(buf + n, len - n,
265 "BPU\t\t: %s%s match, cache:%d, Predict Table:%d\n",
266 IS_AVAIL1(cpu->bpu.full, "full"),
267 IS_AVAIL1(!cpu->bpu.full, "partial"),
268 cpu->bpu.num_cache, cpu->bpu.num_pred);
269
270 return buf;
271}
272
273static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
274{
275 int n = 0;
276 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
277
278 FIX_PTR(cpu);
279
280 n += scnprintf(buf + n, len - n,
281 "Vector Table\t: %#x\nUncached Base\t: %#lx\n",
282 cpu->vec_base, perip_base);
283
284 if (cpu->extn.fpu_sp || cpu->extn.fpu_dp)
285 n += scnprintf(buf + n, len - n, "FPU\t\t: %s%s\n",
286 IS_AVAIL1(cpu->extn.fpu_sp, "SP "),
287 IS_AVAIL1(cpu->extn.fpu_dp, "DP "));
288
289 if (cpu->extn.debug)
290 n += scnprintf(buf + n, len - n, "DEBUG\t\t: %s%s%s\n",
291 IS_AVAIL1(cpu->extn.ap, "ActionPoint "),
292 IS_AVAIL1(cpu->extn.smart, "smaRT "),
293 IS_AVAIL1(cpu->extn.rtt, "RTT "));
294
295 if (cpu->dccm.sz || cpu->iccm.sz)
296 n += scnprintf(buf + n, len - n, "Extn [CCM]\t: DCCM @ %x, %d KB / ICCM: @ %x, %d KB\n",
297 cpu->dccm.base_addr, TO_KB(cpu->dccm.sz),
298 cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
299
300 n += scnprintf(buf + n, len - n,
301 "OS ABI [v3]\t: no-legacy-syscalls\n");
302
303 return buf;
304}
305
306static void arc_chk_core_config(void)
307{
308 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
309 int fpu_enabled;
310
311 if (!cpu->extn.timer0)
312 panic("Timer0 is not present!\n");
313
314 if (!cpu->extn.timer1)
315 panic("Timer1 is not present!\n");
316
317 if (IS_ENABLED(CONFIG_ARC_HAS_RTC) && !cpu->extn.rtc)
318 panic("RTC is not present\n");
319
320#ifdef CONFIG_ARC_HAS_DCCM
321 /*
322 * DCCM can be arbit placed in hardware.
323 * Make sure it's placement/sz matches what Linux is built with
324 */
325 if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
326 panic("Linux built with incorrect DCCM Base address\n");
327
328 if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
329 panic("Linux built with incorrect DCCM Size\n");
330#endif
331
332#ifdef CONFIG_ARC_HAS_ICCM
333 if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
334 panic("Linux built with incorrect ICCM Size\n");
335#endif
336
337 /*
338 * FP hardware/software config sanity
339 * -If hardware contains DPFP, kernel needs to save/restore FPU state
340 * -If not, it will crash trying to save/restore the non-existant regs
341 *
342 * (only DPDP checked since SP has no arch visible regs)
343 */
344 fpu_enabled = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE);
345
346 if (cpu->extn.fpu_dp && !fpu_enabled)
347 pr_warn("CONFIG_ARC_FPU_SAVE_RESTORE needed for working apps\n");
348 else if (!cpu->extn.fpu_dp && fpu_enabled)
349 panic("FPU non-existent, disable CONFIG_ARC_FPU_SAVE_RESTORE\n");
350}
351
352/*
353 * Initialize and setup the processor core
354 * This is called by all the CPUs thus should not do special case stuff
355 * such as only for boot CPU etc
356 */
357
358void setup_processor(void)
359{
360 char str[512];
361 int cpu_id = smp_processor_id();
362
363 read_arc_build_cfg_regs();
364 arc_init_IRQ();
365
366 printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
367
368 arc_mmu_init();
369 arc_cache_init();
370
371 printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
372 printk(arc_platform_smp_cpuinfo());
373
374 arc_chk_core_config();
375}
376
377static inline int is_kernel(unsigned long addr)
378{
379 if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end)
380 return 1;
381 return 0;
382}
383
384void __init setup_arch(char **cmdline_p)
385{
386#ifdef CONFIG_ARC_UBOOT_SUPPORT
387 /* make sure that uboot passed pointer to cmdline/dtb is valid */
388 if (uboot_tag && is_kernel((unsigned long)uboot_arg))
389 panic("Invalid uboot arg\n");
390
391 /* See if u-boot passed an external Device Tree blob */
392 machine_desc = setup_machine_fdt(uboot_arg); /* uboot_tag == 2 */
393 if (!machine_desc)
394#endif
395 {
396 /* No, so try the embedded one */
397 machine_desc = setup_machine_fdt(__dtb_start);
398 if (!machine_desc)
399 panic("Embedded DT invalid\n");
400
401 /*
402 * If we are here, it is established that @uboot_arg didn't
403 * point to DT blob. Instead if u-boot says it is cmdline,
404 * Appent to embedded DT cmdline.
405 * setup_machine_fdt() would have populated @boot_command_line
406 */
407 if (uboot_tag == 1) {
408 /* Ensure a whitespace between the 2 cmdlines */
409 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
410 strlcat(boot_command_line, uboot_arg,
411 COMMAND_LINE_SIZE);
412 }
413 }
414
415 /* Save unparsed command line copy for /proc/cmdline */
416 *cmdline_p = boot_command_line;
417
418 /* To force early parsing of things like mem=xxx */
419 parse_early_param();
420
421 /* Platform/board specific: e.g. early console registration */
422 if (machine_desc->init_early)
423 machine_desc->init_early();
424
425 smp_init_cpus();
426
427 setup_processor();
428 setup_arch_memory();
429
430 /* copy flat DT out of .init and then unflatten it */
431 unflatten_and_copy_device_tree();
432
433 /* Can be issue if someone passes cmd line arg "ro"
434 * But that is unlikely so keeping it as it is
435 */
436 root_mountflags &= ~MS_RDONLY;
437
438#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
439 conswitchp = &dummy_con;
440#endif
441
442 arc_unwind_init();
443}
444
445static int __init customize_machine(void)
446{
447 of_clk_init(NULL);
448 /*
449 * Traverses flattened DeviceTree - registering platform devices
450 * (if any) complete with their resources
451 */
452 of_platform_default_populate(NULL, NULL, NULL);
453
454 if (machine_desc->init_machine)
455 machine_desc->init_machine();
456
457 return 0;
458}
459arch_initcall(customize_machine);
460
461static int __init init_late_machine(void)
462{
463 if (machine_desc->init_late)
464 machine_desc->init_late();
465
466 return 0;
467}
468late_initcall(init_late_machine);
469/*
470 * Get CPU information for use by the procfs.
471 */
472
473#define cpu_to_ptr(c) ((void *)(0xFFFF0000 | (unsigned int)(c)))
474#define ptr_to_cpu(p) (~0xFFFF0000UL & (unsigned int)(p))
475
476static int show_cpuinfo(struct seq_file *m, void *v)
477{
478 char *str;
479 int cpu_id = ptr_to_cpu(v);
480
481 if (!cpu_online(cpu_id)) {
482 seq_printf(m, "processor [%d]\t: Offline\n", cpu_id);
483 goto done;
484 }
485
486 str = (char *)__get_free_page(GFP_TEMPORARY);
487 if (!str)
488 goto done;
489
490 seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
491
492 seq_printf(m, "Bogo MIPS\t: %lu.%02lu\n",
493 loops_per_jiffy / (500000 / HZ),
494 (loops_per_jiffy / (5000 / HZ)) % 100);
495
496 seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
497 seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
498 seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
499 seq_printf(m, arc_platform_smp_cpuinfo());
500
501 free_page((unsigned long)str);
502done:
503 seq_printf(m, "\n");
504
505 return 0;
506}
507
508static void *c_start(struct seq_file *m, loff_t *pos)
509{
510 /*
511 * Callback returns cpu-id to iterator for show routine, NULL to stop.
512 * However since NULL is also a valid cpu-id (0), we use a round-about
513 * way to pass it w/o having to kmalloc/free a 2 byte string.
514 * Encode cpu-id as 0xFFcccc, which is decoded by show routine.
515 */
516 return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL;
517}
518
519static void *c_next(struct seq_file *m, void *v, loff_t *pos)
520{
521 ++*pos;
522 return c_start(m, pos);
523}
524
525static void c_stop(struct seq_file *m, void *v)
526{
527}
528
529const struct seq_operations cpuinfo_op = {
530 .start = c_start,
531 .next = c_next,
532 .stop = c_stop,
533 .show = show_cpuinfo
534};
535
536static DEFINE_PER_CPU(struct cpu, cpu_topology);
537
538static int __init topology_init(void)
539{
540 int cpu;
541
542 for_each_present_cpu(cpu)
543 register_cpu(&per_cpu(cpu_topology, cpu), cpu);
544
545 return 0;
546}
547
548subsys_initcall(topology_init);