Merge tag 'iwlwifi-next-for-kalle-2016-07-01' of git://git.kernel.org/pub/scm/linux...
[sfrench/cifs-2.6.git] / arch / arc / kernel / setup.c
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/of_fdt.h>
17 #include <linux/of_platform.h>
18 #include <linux/cache.h>
19 #include <asm/sections.h>
20 #include <asm/arcregs.h>
21 #include <asm/tlb.h>
22 #include <asm/setup.h>
23 #include <asm/page.h>
24 #include <asm/irq.h>
25 #include <asm/unwind.h>
26 #include <asm/mach_desc.h>
27 #include <asm/smp.h>
28
29 #define FIX_PTR(x)  __asm__ __volatile__(";" : "+r"(x))
30
31 unsigned int intr_to_DE_cnt;
32
33 /* Part of U-boot ABI: see head.S */
34 int __initdata uboot_tag;
35 char __initdata *uboot_arg;
36
37 const struct machine_desc *machine_desc;
38
39 struct task_struct *_current_task[NR_CPUS];     /* For stack switching */
40
41 struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
42
43 static void read_decode_ccm_bcr(struct cpuinfo_arc *cpu)
44 {
45         if (is_isa_arcompact()) {
46                 struct bcr_iccm_arcompact iccm;
47                 struct bcr_dccm_arcompact dccm;
48
49                 READ_BCR(ARC_REG_ICCM_BUILD, iccm);
50                 if (iccm.ver) {
51                         cpu->iccm.sz = 4096 << iccm.sz; /* 8K to 512K */
52                         cpu->iccm.base_addr = iccm.base << 16;
53                 }
54
55                 READ_BCR(ARC_REG_DCCM_BUILD, dccm);
56                 if (dccm.ver) {
57                         unsigned long base;
58                         cpu->dccm.sz = 2048 << dccm.sz; /* 2K to 256K */
59
60                         base = read_aux_reg(ARC_REG_DCCM_BASE_BUILD);
61                         cpu->dccm.base_addr = base & ~0xF;
62                 }
63         } else {
64                 struct bcr_iccm_arcv2 iccm;
65                 struct bcr_dccm_arcv2 dccm;
66                 unsigned long region;
67
68                 READ_BCR(ARC_REG_ICCM_BUILD, iccm);
69                 if (iccm.ver) {
70                         cpu->iccm.sz = 256 << iccm.sz00;        /* 512B to 16M */
71                         if (iccm.sz00 == 0xF && iccm.sz01 > 0)
72                                 cpu->iccm.sz <<= iccm.sz01;
73
74                         region = read_aux_reg(ARC_REG_AUX_ICCM);
75                         cpu->iccm.base_addr = region & 0xF0000000;
76                 }
77
78                 READ_BCR(ARC_REG_DCCM_BUILD, dccm);
79                 if (dccm.ver) {
80                         cpu->dccm.sz = 256 << dccm.sz0;
81                         if (dccm.sz0 == 0xF && dccm.sz1 > 0)
82                                 cpu->dccm.sz <<= dccm.sz1;
83
84                         region = read_aux_reg(ARC_REG_AUX_DCCM);
85                         cpu->dccm.base_addr = region & 0xF0000000;
86                 }
87         }
88 }
89
90 static void read_arc_build_cfg_regs(void)
91 {
92         struct bcr_timer timer;
93         struct bcr_generic bcr;
94         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
95         FIX_PTR(cpu);
96
97         READ_BCR(AUX_IDENTITY, cpu->core);
98         READ_BCR(ARC_REG_ISA_CFG_BCR, cpu->isa);
99
100         READ_BCR(ARC_REG_TIMERS_BCR, timer);
101         cpu->extn.timer0 = timer.t0;
102         cpu->extn.timer1 = timer.t1;
103         cpu->extn.rtc = timer.rtc;
104
105         cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
106
107         READ_BCR(ARC_REG_MUL_BCR, cpu->extn_mpy);
108
109         cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR) > 1 ? 1 : 0; /* 2,3 */
110         cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR) > 1 ? 1 : 0; /* 2,3 */
111         cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR) ? 1 : 0;        /* 1,3 */
112         cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR) ? 1 : 0;
113         cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR) > 1 ? 1 : 0; /* 2 */
114         READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem);
115
116         /* Read CCM BCRs for boot reporting even if not enabled in Kconfig */
117         read_decode_ccm_bcr(cpu);
118
119         read_decode_mmu_bcr();
120         read_decode_cache_bcr();
121
122         if (is_isa_arcompact()) {
123                 struct bcr_fp_arcompact sp, dp;
124                 struct bcr_bpu_arcompact bpu;
125
126                 READ_BCR(ARC_REG_FP_BCR, sp);
127                 READ_BCR(ARC_REG_DPFP_BCR, dp);
128                 cpu->extn.fpu_sp = sp.ver ? 1 : 0;
129                 cpu->extn.fpu_dp = dp.ver ? 1 : 0;
130
131                 READ_BCR(ARC_REG_BPU_BCR, bpu);
132                 cpu->bpu.ver = bpu.ver;
133                 cpu->bpu.full = bpu.fam ? 1 : 0;
134                 if (bpu.ent) {
135                         cpu->bpu.num_cache = 256 << (bpu.ent - 1);
136                         cpu->bpu.num_pred = 256 << (bpu.ent - 1);
137                 }
138         } else {
139                 struct bcr_fp_arcv2 spdp;
140                 struct bcr_bpu_arcv2 bpu;
141
142                 READ_BCR(ARC_REG_FP_V2_BCR, spdp);
143                 cpu->extn.fpu_sp = spdp.sp ? 1 : 0;
144                 cpu->extn.fpu_dp = spdp.dp ? 1 : 0;
145
146                 READ_BCR(ARC_REG_BPU_BCR, bpu);
147                 cpu->bpu.ver = bpu.ver;
148                 cpu->bpu.full = bpu.ft;
149                 cpu->bpu.num_cache = 256 << bpu.bce;
150                 cpu->bpu.num_pred = 2048 << bpu.pte;
151         }
152
153         READ_BCR(ARC_REG_AP_BCR, bcr);
154         cpu->extn.ap = bcr.ver ? 1 : 0;
155
156         READ_BCR(ARC_REG_SMART_BCR, bcr);
157         cpu->extn.smart = bcr.ver ? 1 : 0;
158
159         READ_BCR(ARC_REG_RTT_BCR, bcr);
160         cpu->extn.rtt = bcr.ver ? 1 : 0;
161
162         cpu->extn.debug = cpu->extn.ap | cpu->extn.smart | cpu->extn.rtt;
163 }
164
165 static const struct cpuinfo_data arc_cpu_tbl[] = {
166 #ifdef CONFIG_ISA_ARCOMPACT
167         { {0x20, "ARC 600"      }, 0x2F},
168         { {0x30, "ARC 700"      }, 0x33},
169         { {0x34, "ARC 700 R4.10"}, 0x34},
170         { {0x35, "ARC 700 R4.11"}, 0x35},
171 #else
172         { {0x50, "ARC HS38 R2.0"}, 0x51},
173         { {0x52, "ARC HS38 R2.1"}, 0x52},
174 #endif
175         { {0x00, NULL           } }
176 };
177
178
179 static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
180 {
181         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
182         struct bcr_identity *core = &cpu->core;
183         const struct cpuinfo_data *tbl;
184         char *isa_nm;
185         int i, be, atomic;
186         int n = 0;
187
188         FIX_PTR(cpu);
189
190         if (is_isa_arcompact()) {
191                 isa_nm = "ARCompact";
192                 be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
193
194                 atomic = cpu->isa.atomic1;
195                 if (!cpu->isa.ver)      /* ISA BCR absent, use Kconfig info */
196                         atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC);
197         } else {
198                 isa_nm = "ARCv2";
199                 be = cpu->isa.be;
200                 atomic = cpu->isa.atomic;
201         }
202
203         n += scnprintf(buf + n, len - n,
204                        "\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n",
205                        core->family, core->cpu_id, core->chip_id);
206
207         for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) {
208                 if ((core->family >= tbl->info.id) &&
209                     (core->family <= tbl->up_range)) {
210                         n += scnprintf(buf + n, len - n,
211                                        "processor [%d]\t: %s (%s ISA) %s\n",
212                                        cpu_id, tbl->info.str, isa_nm,
213                                        IS_AVAIL1(be, "[Big-Endian]"));
214                         break;
215                 }
216         }
217
218         if (tbl->info.id == 0)
219                 n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n");
220
221         n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s\nISA Extn\t: ",
222                        IS_AVAIL1(cpu->extn.timer0, "Timer0 "),
223                        IS_AVAIL1(cpu->extn.timer1, "Timer1 "),
224                        IS_AVAIL2(cpu->extn.rtc, "Local-64-bit-Ctr ",
225                                  CONFIG_ARC_HAS_RTC));
226
227         n += i = scnprintf(buf + n, len - n, "%s%s%s%s%s",
228                            IS_AVAIL2(atomic, "atomic ", CONFIG_ARC_HAS_LLSC),
229                            IS_AVAIL2(cpu->isa.ldd, "ll64 ", CONFIG_ARC_HAS_LL64),
230                            IS_AVAIL1(cpu->isa.unalign, "unalign (not used)"));
231
232         if (i)
233                 n += scnprintf(buf + n, len - n, "\n\t\t: ");
234
235         if (cpu->extn_mpy.ver) {
236                 if (cpu->extn_mpy.ver <= 0x2) { /* ARCompact */
237                         n += scnprintf(buf + n, len - n, "mpy ");
238                 } else {
239                         int opt = 2;    /* stock MPY/MPYH */
240
241                         if (cpu->extn_mpy.dsp)  /* OPT 7-9 */
242                                 opt = cpu->extn_mpy.dsp + 6;
243
244                         n += scnprintf(buf + n, len - n, "mpy[opt %d] ", opt);
245                 }
246         }
247
248         n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n",
249                        IS_AVAIL1(cpu->isa.div_rem, "div_rem "),
250                        IS_AVAIL1(cpu->extn.norm, "norm "),
251                        IS_AVAIL1(cpu->extn.barrel, "barrel-shift "),
252                        IS_AVAIL1(cpu->extn.swap, "swap "),
253                        IS_AVAIL1(cpu->extn.minmax, "minmax "),
254                        IS_AVAIL1(cpu->extn.crc, "crc "),
255                        IS_AVAIL2(1, "swape", CONFIG_ARC_HAS_SWAPE));
256
257         if (cpu->bpu.ver)
258                 n += scnprintf(buf + n, len - n,
259                               "BPU\t\t: %s%s match, cache:%d, Predict Table:%d\n",
260                               IS_AVAIL1(cpu->bpu.full, "full"),
261                               IS_AVAIL1(!cpu->bpu.full, "partial"),
262                               cpu->bpu.num_cache, cpu->bpu.num_pred);
263
264         return buf;
265 }
266
267 static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
268 {
269         int n = 0;
270         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
271
272         FIX_PTR(cpu);
273
274         n += scnprintf(buf + n, len - n,
275                        "Vector Table\t: %#x\nUncached Base\t: %#lx\n",
276                        cpu->vec_base, perip_base);
277
278         if (cpu->extn.fpu_sp || cpu->extn.fpu_dp)
279                 n += scnprintf(buf + n, len - n, "FPU\t\t: %s%s\n",
280                                IS_AVAIL1(cpu->extn.fpu_sp, "SP "),
281                                IS_AVAIL1(cpu->extn.fpu_dp, "DP "));
282
283         if (cpu->extn.debug)
284                 n += scnprintf(buf + n, len - n, "DEBUG\t\t: %s%s%s\n",
285                                IS_AVAIL1(cpu->extn.ap, "ActionPoint "),
286                                IS_AVAIL1(cpu->extn.smart, "smaRT "),
287                                IS_AVAIL1(cpu->extn.rtt, "RTT "));
288
289         if (cpu->dccm.sz || cpu->iccm.sz)
290                 n += scnprintf(buf + n, len - n, "Extn [CCM]\t: DCCM @ %x, %d KB / ICCM: @ %x, %d KB\n",
291                                cpu->dccm.base_addr, TO_KB(cpu->dccm.sz),
292                                cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
293
294         n += scnprintf(buf + n, len - n,
295                        "OS ABI [v3]\t: no-legacy-syscalls\n");
296
297         return buf;
298 }
299
300 static void arc_chk_core_config(void)
301 {
302         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
303         int fpu_enabled;
304
305         if (!cpu->extn.timer0)
306                 panic("Timer0 is not present!\n");
307
308         if (!cpu->extn.timer1)
309                 panic("Timer1 is not present!\n");
310
311 #ifdef CONFIG_ARC_HAS_DCCM
312         /*
313          * DCCM can be arbit placed in hardware.
314          * Make sure it's placement/sz matches what Linux is built with
315          */
316         if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
317                 panic("Linux built with incorrect DCCM Base address\n");
318
319         if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
320                 panic("Linux built with incorrect DCCM Size\n");
321 #endif
322
323 #ifdef CONFIG_ARC_HAS_ICCM
324         if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
325                 panic("Linux built with incorrect ICCM Size\n");
326 #endif
327
328         /*
329          * FP hardware/software config sanity
330          * -If hardware contains DPFP, kernel needs to save/restore FPU state
331          * -If not, it will crash trying to save/restore the non-existant regs
332          *
333          * (only DPDP checked since SP has no arch visible regs)
334          */
335         fpu_enabled = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE);
336
337         if (cpu->extn.fpu_dp && !fpu_enabled)
338                 pr_warn("CONFIG_ARC_FPU_SAVE_RESTORE needed for working apps\n");
339         else if (!cpu->extn.fpu_dp && fpu_enabled)
340                 panic("FPU non-existent, disable CONFIG_ARC_FPU_SAVE_RESTORE\n");
341 }
342
343 /*
344  * Initialize and setup the processor core
345  * This is called by all the CPUs thus should not do special case stuff
346  *    such as only for boot CPU etc
347  */
348
349 void setup_processor(void)
350 {
351         char str[512];
352         int cpu_id = smp_processor_id();
353
354         read_arc_build_cfg_regs();
355         arc_init_IRQ();
356
357         printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
358
359         arc_mmu_init();
360         arc_cache_init();
361
362         printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
363         printk(arc_platform_smp_cpuinfo());
364
365         arc_chk_core_config();
366 }
367
368 static inline int is_kernel(unsigned long addr)
369 {
370         if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end)
371                 return 1;
372         return 0;
373 }
374
375 void __init setup_arch(char **cmdline_p)
376 {
377 #ifdef CONFIG_ARC_UBOOT_SUPPORT
378         /* make sure that uboot passed pointer to cmdline/dtb is valid */
379         if (uboot_tag && is_kernel((unsigned long)uboot_arg))
380                 panic("Invalid uboot arg\n");
381
382         /* See if u-boot passed an external Device Tree blob */
383         machine_desc = setup_machine_fdt(uboot_arg);    /* uboot_tag == 2 */
384         if (!machine_desc)
385 #endif
386         {
387                 /* No, so try the embedded one */
388                 machine_desc = setup_machine_fdt(__dtb_start);
389                 if (!machine_desc)
390                         panic("Embedded DT invalid\n");
391
392                 /*
393                  * If we are here, it is established that @uboot_arg didn't
394                  * point to DT blob. Instead if u-boot says it is cmdline,
395                  * append to embedded DT cmdline.
396                  * setup_machine_fdt() would have populated @boot_command_line
397                  */
398                 if (uboot_tag == 1) {
399                         /* Ensure a whitespace between the 2 cmdlines */
400                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
401                         strlcat(boot_command_line, uboot_arg,
402                                 COMMAND_LINE_SIZE);
403                 }
404         }
405
406         /* Save unparsed command line copy for /proc/cmdline */
407         *cmdline_p = boot_command_line;
408
409         /* To force early parsing of things like mem=xxx */
410         parse_early_param();
411
412         /* Platform/board specific: e.g. early console registration */
413         if (machine_desc->init_early)
414                 machine_desc->init_early();
415
416         smp_init_cpus();
417
418         setup_processor();
419         setup_arch_memory();
420
421         /* copy flat DT out of .init and then unflatten it */
422         unflatten_and_copy_device_tree();
423
424         /* Can be issue if someone passes cmd line arg "ro"
425          * But that is unlikely so keeping it as it is
426          */
427         root_mountflags &= ~MS_RDONLY;
428
429 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
430         conswitchp = &dummy_con;
431 #endif
432
433         arc_unwind_init();
434 }
435
436 static int __init customize_machine(void)
437 {
438         /*
439          * Traverses flattened DeviceTree - registering platform devices
440          * (if any) complete with their resources
441          */
442         of_platform_default_populate(NULL, NULL, NULL);
443
444         if (machine_desc->init_machine)
445                 machine_desc->init_machine();
446
447         return 0;
448 }
449 arch_initcall(customize_machine);
450
451 static int __init init_late_machine(void)
452 {
453         if (machine_desc->init_late)
454                 machine_desc->init_late();
455
456         return 0;
457 }
458 late_initcall(init_late_machine);
459 /*
460  *  Get CPU information for use by the procfs.
461  */
462
463 #define cpu_to_ptr(c)   ((void *)(0xFFFF0000 | (unsigned int)(c)))
464 #define ptr_to_cpu(p)   (~0xFFFF0000UL & (unsigned int)(p))
465
466 static int show_cpuinfo(struct seq_file *m, void *v)
467 {
468         char *str;
469         int cpu_id = ptr_to_cpu(v);
470         struct device_node *core_clk = of_find_node_by_name(NULL, "core_clk");
471         u32 freq = 0;
472
473         if (!cpu_online(cpu_id)) {
474                 seq_printf(m, "processor [%d]\t: Offline\n", cpu_id);
475                 goto done;
476         }
477
478         str = (char *)__get_free_page(GFP_TEMPORARY);
479         if (!str)
480                 goto done;
481
482         seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
483
484         of_property_read_u32(core_clk, "clock-frequency", &freq);
485         if (freq)
486                 seq_printf(m, "CPU speed\t: %u.%02u Mhz\n",
487                            freq / 1000000, (freq / 10000) % 100);
488
489         seq_printf(m, "Bogo MIPS\t: %lu.%02lu\n",
490                    loops_per_jiffy / (500000 / HZ),
491                    (loops_per_jiffy / (5000 / HZ)) % 100);
492
493         seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
494         seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
495         seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
496         seq_printf(m, arc_platform_smp_cpuinfo());
497
498         free_page((unsigned long)str);
499 done:
500         seq_printf(m, "\n");
501
502         return 0;
503 }
504
505 static void *c_start(struct seq_file *m, loff_t *pos)
506 {
507         /*
508          * Callback returns cpu-id to iterator for show routine, NULL to stop.
509          * However since NULL is also a valid cpu-id (0), we use a round-about
510          * way to pass it w/o having to kmalloc/free a 2 byte string.
511          * Encode cpu-id as 0xFFcccc, which is decoded by show routine.
512          */
513         return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL;
514 }
515
516 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
517 {
518         ++*pos;
519         return c_start(m, pos);
520 }
521
522 static void c_stop(struct seq_file *m, void *v)
523 {
524 }
525
526 const struct seq_operations cpuinfo_op = {
527         .start  = c_start,
528         .next   = c_next,
529         .stop   = c_stop,
530         .show   = show_cpuinfo
531 };
532
533 static DEFINE_PER_CPU(struct cpu, cpu_topology);
534
535 static int __init topology_init(void)
536 {
537         int cpu;
538
539         for_each_present_cpu(cpu)
540             register_cpu(&per_cpu(cpu_topology, cpu), cpu);
541
542         return 0;
543 }
544
545 subsys_initcall(topology_init);