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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);