1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/arch/m68k/kernel/setup.c
4 *
5 * Copyright (C) 1995 Hamish Macdonald
6 */
7
8 /*
9 * This file handles the architecture-dependent parts of system setup
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/cpu.h>
14 #include <linux/mm.h>
15 #include <linux/sched.h>
16 #include <linux/delay.h>
17 #include <linux/interrupt.h>
18 #include <linux/fs.h>
19 #include <linux/console.h>
20 #include <linux/errno.h>
21 #include <linux/string.h>
22 #include <linux/init.h>
23 #include <linux/memblock.h>
24 #include <linux/proc_fs.h>
25 #include <linux/seq_file.h>
26 #include <linux/module.h>
27 #include <linux/nvram.h>
28 #include <linux/initrd.h>
29 #include <linux/random.h>
30
31 #include <asm/bootinfo.h>
32 #include <asm/byteorder.h>
33 #include <asm/sections.h>
34 #include <asm/setup.h>
35 #include <asm/fpu.h>
36 #include <asm/irq.h>
37 #include <asm/io.h>
38 #include <asm/machdep.h>
39 #ifdef CONFIG_AMIGA
40 #include <asm/amigahw.h>
41 #endif
42 #include <asm/atarihw.h>
43 #ifdef CONFIG_ATARI
44 #include <asm/atari_stram.h>
45 #endif
46 #ifdef CONFIG_SUN3X
47 #include <asm/dvma.h>
48 #endif
49 #include <asm/macintosh.h>
50 #include <asm/natfeat.h>
51 #include <asm/config.h>
52
53 #if !FPSTATESIZE || !NR_IRQS
54 #warning No CPU/platform type selected, your kernel will not work!
55 #warning Are you building an allnoconfig kernel?
56 #endif
57
58 unsigned long m68k_machtype;
59 EXPORT_SYMBOL(m68k_machtype);
60 unsigned long m68k_cputype;
61 EXPORT_SYMBOL(m68k_cputype);
62 unsigned long m68k_fputype;
63 unsigned long m68k_mmutype;
64 EXPORT_SYMBOL(m68k_mmutype);
65 #ifdef CONFIG_VME
66 unsigned long vme_brdtype;
67 EXPORT_SYMBOL(vme_brdtype);
68 #endif
69
70 int m68k_is040or060;
71 EXPORT_SYMBOL(m68k_is040or060);
72
73 extern unsigned long availmem;
74
75 int m68k_num_memory;
76 EXPORT_SYMBOL(m68k_num_memory);
77 int m68k_realnum_memory;
78 EXPORT_SYMBOL(m68k_realnum_memory);
79 unsigned long m68k_memoffset;
80 struct m68k_mem_info m68k_memory[NUM_MEMINFO];
81 EXPORT_SYMBOL(m68k_memory);
82
83 static struct m68k_mem_info m68k_ramdisk __initdata;
84
85 static char m68k_command_line[CL_SIZE] __initdata;
86
87 void (*mach_sched_init) (void) __initdata = NULL;
88 /* machine dependent irq functions */
89 void (*mach_init_IRQ) (void) __initdata = NULL;
90 void (*mach_get_model) (char *model);
91 void (*mach_get_hardware_list) (struct seq_file *m);
92 void (*mach_reset)( void );
93 void (*mach_halt)( void );
94 #ifdef CONFIG_HEARTBEAT
95 void (*mach_heartbeat) (int);
96 EXPORT_SYMBOL(mach_heartbeat);
97 #endif
98 #ifdef CONFIG_M68K_L2_CACHE
99 void (*mach_l2_flush) (int);
100 #endif
101 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
102 int isa_type;
103 int isa_sex;
104 EXPORT_SYMBOL(isa_type);
105 EXPORT_SYMBOL(isa_sex);
106 #endif
107
108 #define MASK_256K 0xfffc0000
109
110 static void __init m68k_parse_bootinfo(const struct bi_record *record)
111 {
112 const struct bi_record *first_record = record;
113 uint16_t tag;
114
115 while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
116 int unknown = 0;
117 const void *data = record->data;
118 uint16_t size = be16_to_cpu(record->size);
119
120 switch (tag) {
121 case BI_MACHTYPE:
122 case BI_CPUTYPE:
123 case BI_FPUTYPE:
124 case BI_MMUTYPE:
125 /* Already set up by head.S */
126 break;
127
128 case BI_MEMCHUNK:
129 if (m68k_num_memory < NUM_MEMINFO) {
130 const struct mem_info *m = data;
131 m68k_memory[m68k_num_memory].addr =
132 be32_to_cpu(m->addr);
133 m68k_memory[m68k_num_memory].size =
134 be32_to_cpu(m->size);
135 m68k_num_memory++;
136 } else
137 pr_warn("%s: too many memory chunks\n",
138 __func__);
139 break;
140
141 case BI_RAMDISK:
142 {
143 const struct mem_info *m = data;
144 m68k_ramdisk.addr = be32_to_cpu(m->addr);
145 m68k_ramdisk.size = be32_to_cpu(m->size);
146 }
147 break;
148
149 case BI_COMMAND_LINE:
150 strscpy(m68k_command_line, data,
151 sizeof(m68k_command_line));
152 break;
153
154 case BI_RNG_SEED: {
155 u16 len = be16_to_cpup(data);
156 add_bootloader_randomness(data + 2, len);
157 /*
158 * Zero the data to preserve forward secrecy, and zero the
159 * length to prevent kexec from using it.
160 */
161 memzero_explicit((void *)data, len + 2);
162 break;
163 }
164
165 default:
166 if (MACH_IS_AMIGA)
167 unknown = amiga_parse_bootinfo(record);
168 else if (MACH_IS_ATARI)
169 unknown = atari_parse_bootinfo(record);
170 else if (MACH_IS_MAC)
171 unknown = mac_parse_bootinfo(record);
172 else if (MACH_IS_Q40)
173 unknown = q40_parse_bootinfo(record);
174 else if (MACH_IS_BVME6000)
175 unknown = bvme6000_parse_bootinfo(record);
176 else if (MACH_IS_MVME16x)
177 unknown = mvme16x_parse_bootinfo(record);
178 else if (MACH_IS_MVME147)
179 unknown = mvme147_parse_bootinfo(record);
180 else if (MACH_IS_HP300)
181 unknown = hp300_parse_bootinfo(record);
182 else if (MACH_IS_APOLLO)
183 unknown = apollo_parse_bootinfo(record);
184 else if (MACH_IS_VIRT)
185 unknown = virt_parse_bootinfo(record);
186 else
187 unknown = 1;
188 }
189 if (unknown)
190 pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
191 tag);
192 record = (struct bi_record *)((unsigned long)record + size);
193 }
194
195 save_bootinfo(first_record);
196
197 m68k_realnum_memory = m68k_num_memory;
198 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
199 if (m68k_num_memory > 1) {
200 pr_warn("%s: ignoring last %i chunks of physical memory\n",
201 __func__, (m68k_num_memory - 1));
202 m68k_num_memory = 1;
203 }
204 #endif
205 }
206
207 void __init setup_arch(char **cmdline_p)
208 {
209 /* The bootinfo is located right after the kernel */
210 if (!CPU_IS_COLDFIRE)
211 m68k_parse_bootinfo((const struct bi_record *)_end);
212
213 if (CPU_IS_040)
214 m68k_is040or060 = 4;
215 else if (CPU_IS_060)
216 m68k_is040or060 = 6;
217
218 /* FIXME: m68k_fputype is passed in by Penguin booter, which can
219 * be confused by software FPU emulation. BEWARE.
220 * We should really do our own FPU check at startup.
221 * [what do we do with buggy 68LC040s? if we have problems
222 * with them, we should add a test to check_bugs() below] */
223 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
224 /* clear the fpu if we have one */
225 if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
226 volatile int zero = 0;
227 asm volatile ("frestore %0" : : "m" (zero));
228 }
229 #endif
230
231 if (CPU_IS_060) {
232 u32 pcr;
233
234 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
235 : "=d" (pcr));
236 if (((pcr >> 8) & 0xff) <= 5) {
237 pr_warn("Enabling workaround for errata I14\n");
238 asm (".chip 68060; movec %0,%%pcr; .chip 68k"
239 : : "d" (pcr | 0x20));
240 }
241 }
242
243 setup_initial_init_mm((void *)PAGE_OFFSET, _etext, _edata, _end);
244
245 #if defined(CONFIG_BOOTPARAM)
246 strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
247 m68k_command_line[CL_SIZE - 1] = 0;
248 #endif /* CONFIG_BOOTPARAM */
249 process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
250 *cmdline_p = m68k_command_line;
251 memcpy(boot_command_line, *cmdline_p, CL_SIZE);
252
253 parse_early_param();
254
255 switch (m68k_machtype) {
256 #ifdef CONFIG_AMIGA
257 case MACH_AMIGA:
258 config_amiga();
259 break;
260 #endif
261 #ifdef CONFIG_ATARI
262 case MACH_ATARI:
263 config_atari();
264 break;
265 #endif
266 #ifdef CONFIG_MAC
267 case MACH_MAC:
268 config_mac();
269 break;
270 #endif
271 #ifdef CONFIG_SUN3
272 case MACH_SUN3:
273 config_sun3();
274 break;
275 #endif
276 #ifdef CONFIG_APOLLO
277 case MACH_APOLLO:
278 config_apollo();
279 break;
280 #endif
281 #ifdef CONFIG_MVME147
282 case MACH_MVME147:
283 config_mvme147();
284 break;
285 #endif
286 #ifdef CONFIG_MVME16x
287 case MACH_MVME16x:
288 config_mvme16x();
289 break;
290 #endif
291 #ifdef CONFIG_BVME6000
292 case MACH_BVME6000:
293 config_bvme6000();
294 break;
295 #endif
296 #ifdef CONFIG_HP300
297 case MACH_HP300:
298 config_hp300();
299 break;
300 #endif
301 #ifdef CONFIG_Q40
302 case MACH_Q40:
303 config_q40();
304 break;
305 #endif
306 #ifdef CONFIG_SUN3X
307 case MACH_SUN3X:
308 config_sun3x();
309 break;
310 #endif
311 #ifdef CONFIG_COLDFIRE
312 case MACH_M54XX:
313 case MACH_M5441X:
314 cf_bootmem_alloc();
315 cf_mmu_context_init();
316 config_BSP(NULL, 0);
317 break;
318 #endif
319 #ifdef CONFIG_VIRT
320 case MACH_VIRT:
321 config_virt();
322 break;
323 #endif
324 default:
325 panic("No configuration setup");
326 }
327
328 if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && m68k_ramdisk.size)
329 memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);
330
331 paging_init();
332
333 if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && m68k_ramdisk.size) {
334 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
335 initrd_end = initrd_start + m68k_ramdisk.size;
336 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
337 }
338
339 #ifdef CONFIG_NATFEAT
340 nf_init();
341 #endif
342
343 #ifdef CONFIG_ATARI
344 if (MACH_IS_ATARI)
345 atari_stram_reserve_pages((void *)availmem);
346 #endif
347 #ifdef CONFIG_SUN3X
348 if (MACH_IS_SUN3X) {
349 dvma_init();
350 }
351 #endif
352
353 /* set ISA defs early as possible */
354 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
355 if (MACH_IS_Q40) {
356 isa_type = ISA_TYPE_Q40;
357 isa_sex = 0;
358 }
359 #ifdef CONFIG_AMIGA_PCMCIA
360 if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
361 isa_type = ISA_TYPE_AG;
362 isa_sex = 1;
363 }
364 #endif
365 #ifdef CONFIG_ATARI_ROM_ISA
366 if (MACH_IS_ATARI) {
367 isa_type = ISA_TYPE_ENEC;
368 isa_sex = 0;
369 }
370 #endif
371 #endif
372 }
373
374 static int show_cpuinfo(struct seq_file *m, void *v)
375 {
376 const char *cpu, *mmu, *fpu;
377 unsigned long clockfreq, clockfactor;
378
379 #define LOOP_CYCLES_68020 (8)
380 #define LOOP_CYCLES_68030 (8)
381 #define LOOP_CYCLES_68040 (3)
382 #define LOOP_CYCLES_68060 (1)
383 #define LOOP_CYCLES_COLDFIRE (2)
384
385 if (CPU_IS_020) {
386 cpu = "68020";
387 clockfactor = LOOP_CYCLES_68020;
388 } else if (CPU_IS_030) {
389 cpu = "68030";
390 clockfactor = LOOP_CYCLES_68030;
391 } else if (CPU_IS_040) {
392 cpu = "68040";
393 clockfactor = LOOP_CYCLES_68040;
394 } else if (CPU_IS_060) {
395 cpu = "68060";
396 clockfactor = LOOP_CYCLES_68060;
397 } else if (CPU_IS_COLDFIRE) {
398 cpu = "ColdFire";
399 clockfactor = LOOP_CYCLES_COLDFIRE;
400 } else {
401 cpu = "680x0";
402 clockfactor = 0;
403 }
404
405 #ifdef CONFIG_M68KFPU_EMU_ONLY
406 fpu = "none(soft float)";
407 #else
408 if (m68k_fputype & FPU_68881)
409 fpu = "68881";
410 else if (m68k_fputype & FPU_68882)
411 fpu = "68882";
412 else if (m68k_fputype & FPU_68040)
413 fpu = "68040";
414 else if (m68k_fputype & FPU_68060)
415 fpu = "68060";
416 else if (m68k_fputype & FPU_SUNFPA)
417 fpu = "Sun FPA";
418 else if (m68k_fputype & FPU_COLDFIRE)
419 fpu = "ColdFire";
420 else
421 fpu = "none";
422 #endif
423
424 if (m68k_mmutype & MMU_68851)
425 mmu = "68851";
426 else if (m68k_mmutype & MMU_68030)
427 mmu = "68030";
428 else if (m68k_mmutype & MMU_68040)
429 mmu = "68040";
430 else if (m68k_mmutype & MMU_68060)
431 mmu = "68060";
432 else if (m68k_mmutype & MMU_SUN3)
433 mmu = "Sun-3";
434 else if (m68k_mmutype & MMU_APOLLO)
435 mmu = "Apollo";
436 else if (m68k_mmutype & MMU_COLDFIRE)
437 mmu = "ColdFire";
438 else
439 mmu = "unknown";
440
441 clockfreq = loops_per_jiffy * HZ * clockfactor;
442
443 seq_printf(m, "CPU:\t\t%s\n"
444 "MMU:\t\t%s\n"
445 "FPU:\t\t%s\n"
446 "Clocking:\t%lu.%1luMHz\n"
447 "BogoMips:\t%lu.%02lu\n"
448 "Calibration:\t%lu loops\n",
449 cpu, mmu, fpu,
450 clockfreq/1000000,(clockfreq/100000)%10,
451 loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
452 loops_per_jiffy);
453 return 0;
454 }
455
456 static void *c_start(struct seq_file *m, loff_t *pos)
457 {
458 return *pos < 1 ? (void *)1 : NULL;
459 }
460 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
461 {
462 ++*pos;
463 return NULL;
464 }
465 static void c_stop(struct seq_file *m, void *v)
466 {
467 }
468 const struct seq_operations cpuinfo_op = {
469 .start = c_start,
470 .next = c_next,
471 .stop = c_stop,
472 .show = show_cpuinfo,
473 };
474
475 #ifdef CONFIG_PROC_HARDWARE
476 static int hardware_proc_show(struct seq_file *m, void *v)
477 {
478 char model[80];
479 unsigned long mem;
480 int i;
481
482 if (mach_get_model)
483 mach_get_model(model);
484 else
485 strcpy(model, "Unknown m68k");
486
487 seq_printf(m, "Model:\t\t%s\n", model);
488 for (mem = 0, i = 0; i < m68k_num_memory; i++)
489 mem += m68k_memory[i].size;
490 seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
491
492 if (mach_get_hardware_list)
493 mach_get_hardware_list(m);
494
495 return 0;
496 }
497
498 static int __init proc_hardware_init(void)
499 {
500 proc_create_single("hardware", 0, NULL, hardware_proc_show);
501 return 0;
502 }
503 module_init(proc_hardware_init);
504 #endif
505
506 void __init arch_cpu_finalize_init(void)
507 {
508 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
509 if (m68k_fputype == 0) {
510 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
511 "WHICH IS REQUIRED BY LINUX/M68K ***\n");
512 pr_emerg("Upgrade your hardware or join the FPU "
513 "emulation project\n");
514 panic("no FPU");
515 }
516 #endif /* !CONFIG_M68KFPU_EMU */
517 }
518
519 #ifdef CONFIG_ADB
520 static int __init adb_probe_sync_enable (char *str) {
521 extern int __adb_probe_sync;
522 __adb_probe_sync = 1;
523 return 1;
524 }
525
526 __setup("adb_sync", adb_probe_sync_enable);
527 #endif /* CONFIG_ADB */
528
529 #if IS_ENABLED(CONFIG_NVRAM)
530 #ifdef CONFIG_MAC
531 static unsigned char m68k_nvram_read_byte(int addr)
532 {
533 if (MACH_IS_MAC)
534 return mac_pram_read_byte(addr);
535 return 0xff;
536 }
537
538 static void m68k_nvram_write_byte(unsigned char val, int addr)
539 {
540 if (MACH_IS_MAC)
541 mac_pram_write_byte(val, addr);
542 }
543 #endif /* CONFIG_MAC */
544
545 #ifdef CONFIG_ATARI
546 static ssize_t m68k_nvram_read(char *buf, size_t count, loff_t *ppos)
547 {
548 if (MACH_IS_ATARI)
549 return atari_nvram_read(buf, count, ppos);
550 else if (MACH_IS_MAC)
551 return nvram_read_bytes(buf, count, ppos);
552 return -EINVAL;
553 }
554
555 static ssize_t m68k_nvram_write(char *buf, size_t count, loff_t *ppos)
556 {
557 if (MACH_IS_ATARI)
558 return atari_nvram_write(buf, count, ppos);
559 else if (MACH_IS_MAC)
560 return nvram_write_bytes(buf, count, ppos);
561 return -EINVAL;
562 }
563
564 static long m68k_nvram_set_checksum(void)
565 {
566 if (MACH_IS_ATARI)
567 return atari_nvram_set_checksum();
568 return -EINVAL;
569 }
570
571 static long m68k_nvram_initialize(void)
572 {
573 if (MACH_IS_ATARI)
574 return atari_nvram_initialize();
575 return -EINVAL;
576 }
577 #endif /* CONFIG_ATARI */
578
579 static ssize_t m68k_nvram_get_size(void)
580 {
581 if (MACH_IS_ATARI)
582 return atari_nvram_get_size();
583 else if (MACH_IS_MAC)
584 return mac_pram_get_size();
585 return -ENODEV;
586 }
587
588 /* Atari device drivers call .read (to get checksum validation) whereas
589 * Mac and PowerMac device drivers just use .read_byte.
590 */
591 const struct nvram_ops arch_nvram_ops = {
592 #ifdef CONFIG_MAC
593 .read_byte = m68k_nvram_read_byte,
594 .write_byte = m68k_nvram_write_byte,
595 #endif
596 #ifdef CONFIG_ATARI
597 .read = m68k_nvram_read,
598 .write = m68k_nvram_write,
599 .set_checksum = m68k_nvram_set_checksum,
600 .initialize = m68k_nvram_initialize,
601 #endif
602 .get_size = m68k_nvram_get_size,
603 };
604 EXPORT_SYMBOL(arch_nvram_ops);
605 #endif /* CONFIG_NVRAM */
606
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