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 extern void paging_init(void);
111
m68k_parse_bootinfo(const struct bi_record * record)112 static void __init m68k_parse_bootinfo(const struct bi_record *record)
113 {
114 const struct bi_record *first_record = record;
115 uint16_t tag;
116
117 while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
118 int unknown = 0;
119 const void *data = record->data;
120 uint16_t size = be16_to_cpu(record->size);
121
122 switch (tag) {
123 case BI_MACHTYPE:
124 case BI_CPUTYPE:
125 case BI_FPUTYPE:
126 case BI_MMUTYPE:
127 /* Already set up by head.S */
128 break;
129
130 case BI_MEMCHUNK:
131 if (m68k_num_memory < NUM_MEMINFO) {
132 const struct mem_info *m = data;
133 m68k_memory[m68k_num_memory].addr =
134 be32_to_cpu(m->addr);
135 m68k_memory[m68k_num_memory].size =
136 be32_to_cpu(m->size);
137 m68k_num_memory++;
138 } else
139 pr_warn("%s: too many memory chunks\n",
140 __func__);
141 break;
142
143 case BI_RAMDISK:
144 {
145 const struct mem_info *m = data;
146 m68k_ramdisk.addr = be32_to_cpu(m->addr);
147 m68k_ramdisk.size = be32_to_cpu(m->size);
148 }
149 break;
150
151 case BI_COMMAND_LINE:
152 strscpy(m68k_command_line, data,
153 sizeof(m68k_command_line));
154 break;
155
156 case BI_RNG_SEED: {
157 u16 len = be16_to_cpup(data);
158 add_bootloader_randomness(data + 2, len);
159 /*
160 * Zero the data to preserve forward secrecy, and zero the
161 * length to prevent kexec from using it.
162 */
163 memzero_explicit((void *)data, len + 2);
164 break;
165 }
166
167 default:
168 if (MACH_IS_AMIGA)
169 unknown = amiga_parse_bootinfo(record);
170 else if (MACH_IS_ATARI)
171 unknown = atari_parse_bootinfo(record);
172 else if (MACH_IS_MAC)
173 unknown = mac_parse_bootinfo(record);
174 else if (MACH_IS_Q40)
175 unknown = q40_parse_bootinfo(record);
176 else if (MACH_IS_BVME6000)
177 unknown = bvme6000_parse_bootinfo(record);
178 else if (MACH_IS_MVME16x)
179 unknown = mvme16x_parse_bootinfo(record);
180 else if (MACH_IS_MVME147)
181 unknown = mvme147_parse_bootinfo(record);
182 else if (MACH_IS_HP300)
183 unknown = hp300_parse_bootinfo(record);
184 else if (MACH_IS_APOLLO)
185 unknown = apollo_parse_bootinfo(record);
186 else if (MACH_IS_VIRT)
187 unknown = virt_parse_bootinfo(record);
188 else
189 unknown = 1;
190 }
191 if (unknown)
192 pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
193 tag);
194 record = (struct bi_record *)((unsigned long)record + size);
195 }
196
197 save_bootinfo(first_record);
198
199 m68k_realnum_memory = m68k_num_memory;
200 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
201 if (m68k_num_memory > 1) {
202 pr_warn("%s: ignoring last %i chunks of physical memory\n",
203 __func__, (m68k_num_memory - 1));
204 m68k_num_memory = 1;
205 }
206 #endif
207 }
208
setup_arch(char ** cmdline_p)209 void __init setup_arch(char **cmdline_p)
210 {
211 /* The bootinfo is located right after the kernel */
212 if (!CPU_IS_COLDFIRE)
213 m68k_parse_bootinfo((const struct bi_record *)_end);
214
215 if (CPU_IS_040)
216 m68k_is040or060 = 4;
217 else if (CPU_IS_060)
218 m68k_is040or060 = 6;
219
220 /* FIXME: m68k_fputype is passed in by Penguin booter, which can
221 * be confused by software FPU emulation. BEWARE.
222 * We should really do our own FPU check at startup.
223 * [what do we do with buggy 68LC040s? if we have problems
224 * with them, we should add a test to check_bugs() below] */
225 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
226 /* clear the fpu if we have one */
227 if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
228 volatile int zero = 0;
229 asm volatile ("frestore %0" : : "m" (zero));
230 }
231 #endif
232
233 if (CPU_IS_060) {
234 u32 pcr;
235
236 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
237 : "=d" (pcr));
238 if (((pcr >> 8) & 0xff) <= 5) {
239 pr_warn("Enabling workaround for errata I14\n");
240 asm (".chip 68060; movec %0,%%pcr; .chip 68k"
241 : : "d" (pcr | 0x20));
242 }
243 }
244
245 setup_initial_init_mm((void *)PAGE_OFFSET, _etext, _edata, _end);
246
247 #if defined(CONFIG_BOOTPARAM)
248 strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
249 m68k_command_line[CL_SIZE - 1] = 0;
250 #endif /* CONFIG_BOOTPARAM */
251 process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
252 *cmdline_p = m68k_command_line;
253 memcpy(boot_command_line, *cmdline_p, CL_SIZE);
254
255 parse_early_param();
256
257 switch (m68k_machtype) {
258 #ifdef CONFIG_AMIGA
259 case MACH_AMIGA:
260 config_amiga();
261 break;
262 #endif
263 #ifdef CONFIG_ATARI
264 case MACH_ATARI:
265 config_atari();
266 break;
267 #endif
268 #ifdef CONFIG_MAC
269 case MACH_MAC:
270 config_mac();
271 break;
272 #endif
273 #ifdef CONFIG_SUN3
274 case MACH_SUN3:
275 config_sun3();
276 break;
277 #endif
278 #ifdef CONFIG_APOLLO
279 case MACH_APOLLO:
280 config_apollo();
281 break;
282 #endif
283 #ifdef CONFIG_MVME147
284 case MACH_MVME147:
285 config_mvme147();
286 break;
287 #endif
288 #ifdef CONFIG_MVME16x
289 case MACH_MVME16x:
290 config_mvme16x();
291 break;
292 #endif
293 #ifdef CONFIG_BVME6000
294 case MACH_BVME6000:
295 config_bvme6000();
296 break;
297 #endif
298 #ifdef CONFIG_HP300
299 case MACH_HP300:
300 config_hp300();
301 break;
302 #endif
303 #ifdef CONFIG_Q40
304 case MACH_Q40:
305 config_q40();
306 break;
307 #endif
308 #ifdef CONFIG_SUN3X
309 case MACH_SUN3X:
310 config_sun3x();
311 break;
312 #endif
313 #ifdef CONFIG_COLDFIRE
314 case MACH_M54XX:
315 case MACH_M5441X:
316 cf_bootmem_alloc();
317 cf_mmu_context_init();
318 config_BSP(NULL, 0);
319 break;
320 #endif
321 #ifdef CONFIG_VIRT
322 case MACH_VIRT:
323 config_virt();
324 break;
325 #endif
326 default:
327 panic("No configuration setup");
328 }
329
330 if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && m68k_ramdisk.size)
331 memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);
332
333 paging_init();
334
335 if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && m68k_ramdisk.size) {
336 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
337 initrd_end = initrd_start + m68k_ramdisk.size;
338 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
339 }
340
341 #ifdef CONFIG_NATFEAT
342 nf_init();
343 #endif
344
345 #ifdef CONFIG_ATARI
346 if (MACH_IS_ATARI)
347 atari_stram_reserve_pages((void *)availmem);
348 #endif
349 #ifdef CONFIG_SUN3X
350 if (MACH_IS_SUN3X) {
351 dvma_init();
352 }
353 #endif
354
355 /* set ISA defs early as possible */
356 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
357 if (MACH_IS_Q40) {
358 isa_type = ISA_TYPE_Q40;
359 isa_sex = 0;
360 }
361 #ifdef CONFIG_AMIGA_PCMCIA
362 if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
363 isa_type = ISA_TYPE_AG;
364 isa_sex = 1;
365 }
366 #endif
367 #ifdef CONFIG_ATARI_ROM_ISA
368 if (MACH_IS_ATARI) {
369 isa_type = ISA_TYPE_ENEC;
370 isa_sex = 0;
371 }
372 #endif
373 #endif
374 }
375
show_cpuinfo(struct seq_file * m,void * v)376 static int show_cpuinfo(struct seq_file *m, void *v)
377 {
378 const char *cpu, *mmu, *fpu;
379 unsigned long clockfreq, clockfactor;
380
381 #define LOOP_CYCLES_68020 (8)
382 #define LOOP_CYCLES_68030 (8)
383 #define LOOP_CYCLES_68040 (3)
384 #define LOOP_CYCLES_68060 (1)
385 #define LOOP_CYCLES_COLDFIRE (2)
386
387 if (CPU_IS_020) {
388 cpu = "68020";
389 clockfactor = LOOP_CYCLES_68020;
390 } else if (CPU_IS_030) {
391 cpu = "68030";
392 clockfactor = LOOP_CYCLES_68030;
393 } else if (CPU_IS_040) {
394 cpu = "68040";
395 clockfactor = LOOP_CYCLES_68040;
396 } else if (CPU_IS_060) {
397 cpu = "68060";
398 clockfactor = LOOP_CYCLES_68060;
399 } else if (CPU_IS_COLDFIRE) {
400 cpu = "ColdFire";
401 clockfactor = LOOP_CYCLES_COLDFIRE;
402 } else {
403 cpu = "680x0";
404 clockfactor = 0;
405 }
406
407 #ifdef CONFIG_M68KFPU_EMU_ONLY
408 fpu = "none(soft float)";
409 #else
410 if (m68k_fputype & FPU_68881)
411 fpu = "68881";
412 else if (m68k_fputype & FPU_68882)
413 fpu = "68882";
414 else if (m68k_fputype & FPU_68040)
415 fpu = "68040";
416 else if (m68k_fputype & FPU_68060)
417 fpu = "68060";
418 else if (m68k_fputype & FPU_SUNFPA)
419 fpu = "Sun FPA";
420 else if (m68k_fputype & FPU_COLDFIRE)
421 fpu = "ColdFire";
422 else
423 fpu = "none";
424 #endif
425
426 if (m68k_mmutype & MMU_68851)
427 mmu = "68851";
428 else if (m68k_mmutype & MMU_68030)
429 mmu = "68030";
430 else if (m68k_mmutype & MMU_68040)
431 mmu = "68040";
432 else if (m68k_mmutype & MMU_68060)
433 mmu = "68060";
434 else if (m68k_mmutype & MMU_SUN3)
435 mmu = "Sun-3";
436 else if (m68k_mmutype & MMU_APOLLO)
437 mmu = "Apollo";
438 else if (m68k_mmutype & MMU_COLDFIRE)
439 mmu = "ColdFire";
440 else
441 mmu = "unknown";
442
443 clockfreq = loops_per_jiffy * HZ * clockfactor;
444
445 seq_printf(m, "CPU:\t\t%s\n"
446 "MMU:\t\t%s\n"
447 "FPU:\t\t%s\n"
448 "Clocking:\t%lu.%1luMHz\n"
449 "BogoMips:\t%lu.%02lu\n"
450 "Calibration:\t%lu loops\n",
451 cpu, mmu, fpu,
452 clockfreq/1000000,(clockfreq/100000)%10,
453 loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
454 loops_per_jiffy);
455 return 0;
456 }
457
c_start(struct seq_file * m,loff_t * pos)458 static void *c_start(struct seq_file *m, loff_t *pos)
459 {
460 return *pos < 1 ? (void *)1 : NULL;
461 }
c_next(struct seq_file * m,void * v,loff_t * pos)462 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
463 {
464 ++*pos;
465 return NULL;
466 }
c_stop(struct seq_file * m,void * v)467 static void c_stop(struct seq_file *m, void *v)
468 {
469 }
470 const struct seq_operations cpuinfo_op = {
471 .start = c_start,
472 .next = c_next,
473 .stop = c_stop,
474 .show = show_cpuinfo,
475 };
476
477 #ifdef CONFIG_PROC_HARDWARE
hardware_proc_show(struct seq_file * m,void * v)478 static int hardware_proc_show(struct seq_file *m, void *v)
479 {
480 char model[80];
481 unsigned long mem;
482 int i;
483
484 if (mach_get_model)
485 mach_get_model(model);
486 else
487 strcpy(model, "Unknown m68k");
488
489 seq_printf(m, "Model:\t\t%s\n", model);
490 for (mem = 0, i = 0; i < m68k_num_memory; i++)
491 mem += m68k_memory[i].size;
492 seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
493
494 if (mach_get_hardware_list)
495 mach_get_hardware_list(m);
496
497 return 0;
498 }
499
proc_hardware_init(void)500 static int __init proc_hardware_init(void)
501 {
502 proc_create_single("hardware", 0, NULL, hardware_proc_show);
503 return 0;
504 }
505 module_init(proc_hardware_init);
506 #endif
507
arch_cpu_finalize_init(void)508 void __init arch_cpu_finalize_init(void)
509 {
510 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
511 if (m68k_fputype == 0) {
512 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
513 "WHICH IS REQUIRED BY LINUX/M68K ***\n");
514 pr_emerg("Upgrade your hardware or join the FPU "
515 "emulation project\n");
516 panic("no FPU");
517 }
518 #endif /* !CONFIG_M68KFPU_EMU */
519 }
520
521 #ifdef CONFIG_ADB
adb_probe_sync_enable(char * str)522 static int __init adb_probe_sync_enable (char *str) {
523 extern int __adb_probe_sync;
524 __adb_probe_sync = 1;
525 return 1;
526 }
527
528 __setup("adb_sync", adb_probe_sync_enable);
529 #endif /* CONFIG_ADB */
530
531 #if IS_ENABLED(CONFIG_NVRAM)
532 #ifdef CONFIG_MAC
m68k_nvram_read_byte(int addr)533 static unsigned char m68k_nvram_read_byte(int addr)
534 {
535 if (MACH_IS_MAC)
536 return mac_pram_read_byte(addr);
537 return 0xff;
538 }
539
m68k_nvram_write_byte(unsigned char val,int addr)540 static void m68k_nvram_write_byte(unsigned char val, int addr)
541 {
542 if (MACH_IS_MAC)
543 mac_pram_write_byte(val, addr);
544 }
545 #endif /* CONFIG_MAC */
546
547 #ifdef CONFIG_ATARI
m68k_nvram_read(char * buf,size_t count,loff_t * ppos)548 static ssize_t m68k_nvram_read(char *buf, size_t count, loff_t *ppos)
549 {
550 if (MACH_IS_ATARI)
551 return atari_nvram_read(buf, count, ppos);
552 else if (MACH_IS_MAC)
553 return nvram_read_bytes(buf, count, ppos);
554 return -EINVAL;
555 }
556
m68k_nvram_write(char * buf,size_t count,loff_t * ppos)557 static ssize_t m68k_nvram_write(char *buf, size_t count, loff_t *ppos)
558 {
559 if (MACH_IS_ATARI)
560 return atari_nvram_write(buf, count, ppos);
561 else if (MACH_IS_MAC)
562 return nvram_write_bytes(buf, count, ppos);
563 return -EINVAL;
564 }
565
m68k_nvram_set_checksum(void)566 static long m68k_nvram_set_checksum(void)
567 {
568 if (MACH_IS_ATARI)
569 return atari_nvram_set_checksum();
570 return -EINVAL;
571 }
572
m68k_nvram_initialize(void)573 static long m68k_nvram_initialize(void)
574 {
575 if (MACH_IS_ATARI)
576 return atari_nvram_initialize();
577 return -EINVAL;
578 }
579 #endif /* CONFIG_ATARI */
580
m68k_nvram_get_size(void)581 static ssize_t m68k_nvram_get_size(void)
582 {
583 if (MACH_IS_ATARI)
584 return atari_nvram_get_size();
585 else if (MACH_IS_MAC)
586 return mac_pram_get_size();
587 return -ENODEV;
588 }
589
590 /* Atari device drivers call .read (to get checksum validation) whereas
591 * Mac and PowerMac device drivers just use .read_byte.
592 */
593 const struct nvram_ops arch_nvram_ops = {
594 #ifdef CONFIG_MAC
595 .read_byte = m68k_nvram_read_byte,
596 .write_byte = m68k_nvram_write_byte,
597 #endif
598 #ifdef CONFIG_ATARI
599 .read = m68k_nvram_read,
600 .write = m68k_nvram_write,
601 .set_checksum = m68k_nvram_set_checksum,
602 .initialize = m68k_nvram_initialize,
603 #endif
604 .get_size = m68k_nvram_get_size,
605 };
606 EXPORT_SYMBOL(arch_nvram_ops);
607 #endif /* CONFIG_NVRAM */
608