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/mm.h>
14 #include <linux/sched.h>
15 #include <linux/delay.h>
16 #include <linux/interrupt.h>
17 #include <linux/fs.h>
18 #include <linux/console.h>
19 #include <linux/genhd.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
30 #include <asm/bootinfo.h>
31 #include <asm/byteorder.h>
32 #include <asm/sections.h>
33 #include <asm/setup.h>
34 #include <asm/fpu.h>
35 #include <asm/irq.h>
36 #include <asm/io.h>
37 #include <asm/machdep.h>
38 #ifdef CONFIG_AMIGA
39 #include <asm/amigahw.h>
40 #endif
41 #include <asm/atarihw.h>
42 #ifdef CONFIG_ATARI
43 #include <asm/atari_stram.h>
44 #endif
45 #ifdef CONFIG_SUN3X
46 #include <asm/dvma.h>
47 #endif
48 #include <asm/macintosh.h>
49 #include <asm/natfeat.h>
50
51 #if !FPSTATESIZE || !NR_IRQS
52 #warning No CPU/platform type selected, your kernel will not work!
53 #warning Are you building an allnoconfig kernel?
54 #endif
55
56 unsigned long m68k_machtype;
57 EXPORT_SYMBOL(m68k_machtype);
58 unsigned long m68k_cputype;
59 EXPORT_SYMBOL(m68k_cputype);
60 unsigned long m68k_fputype;
61 unsigned long m68k_mmutype;
62 EXPORT_SYMBOL(m68k_mmutype);
63 #ifdef CONFIG_VME
64 unsigned long vme_brdtype;
65 EXPORT_SYMBOL(vme_brdtype);
66 #endif
67
68 int m68k_is040or060;
69 EXPORT_SYMBOL(m68k_is040or060);
70
71 extern unsigned long availmem;
72
73 int m68k_num_memory;
74 EXPORT_SYMBOL(m68k_num_memory);
75 int m68k_realnum_memory;
76 EXPORT_SYMBOL(m68k_realnum_memory);
77 unsigned long m68k_memoffset;
78 struct m68k_mem_info m68k_memory[NUM_MEMINFO];
79 EXPORT_SYMBOL(m68k_memory);
80
81 static struct m68k_mem_info m68k_ramdisk __initdata;
82
83 static char m68k_command_line[CL_SIZE] __initdata;
84
85 void (*mach_sched_init) (void) __initdata = NULL;
86 /* machine dependent irq functions */
87 void (*mach_init_IRQ) (void) __initdata = NULL;
88 void (*mach_get_model) (char *model);
89 void (*mach_get_hardware_list) (struct seq_file *m);
90 /* machine dependent timer functions */
91 int (*mach_hwclk) (int, struct rtc_time*);
92 EXPORT_SYMBOL(mach_hwclk);
93 unsigned int (*mach_get_ss)(void);
94 int (*mach_get_rtc_pll)(struct rtc_pll_info *);
95 int (*mach_set_rtc_pll)(struct rtc_pll_info *);
96 EXPORT_SYMBOL(mach_get_ss);
97 EXPORT_SYMBOL(mach_get_rtc_pll);
98 EXPORT_SYMBOL(mach_set_rtc_pll);
99 void (*mach_reset)( void );
100 void (*mach_halt)( void );
101 void (*mach_power_off)( void );
102 #ifdef CONFIG_HEARTBEAT
103 void (*mach_heartbeat) (int);
104 EXPORT_SYMBOL(mach_heartbeat);
105 #endif
106 #ifdef CONFIG_M68K_L2_CACHE
107 void (*mach_l2_flush) (int);
108 #endif
109 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
110 int isa_type;
111 int isa_sex;
112 EXPORT_SYMBOL(isa_type);
113 EXPORT_SYMBOL(isa_sex);
114 #endif
115
116 extern int amiga_parse_bootinfo(const struct bi_record *);
117 extern int atari_parse_bootinfo(const struct bi_record *);
118 extern int mac_parse_bootinfo(const struct bi_record *);
119 extern int q40_parse_bootinfo(const struct bi_record *);
120 extern int bvme6000_parse_bootinfo(const struct bi_record *);
121 extern int mvme16x_parse_bootinfo(const struct bi_record *);
122 extern int mvme147_parse_bootinfo(const struct bi_record *);
123 extern int hp300_parse_bootinfo(const struct bi_record *);
124 extern int apollo_parse_bootinfo(const struct bi_record *);
125
126 extern void config_amiga(void);
127 extern void config_atari(void);
128 extern void config_mac(void);
129 extern void config_sun3(void);
130 extern void config_apollo(void);
131 extern void config_mvme147(void);
132 extern void config_mvme16x(void);
133 extern void config_bvme6000(void);
134 extern void config_hp300(void);
135 extern void config_q40(void);
136 extern void config_sun3x(void);
137
138 #define MASK_256K 0xfffc0000
139
140 extern void paging_init(void);
141
m68k_parse_bootinfo(const struct bi_record * record)142 static void __init m68k_parse_bootinfo(const struct bi_record *record)
143 {
144 uint16_t tag;
145
146 save_bootinfo(record);
147
148 while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
149 int unknown = 0;
150 const void *data = record->data;
151 uint16_t size = be16_to_cpu(record->size);
152
153 switch (tag) {
154 case BI_MACHTYPE:
155 case BI_CPUTYPE:
156 case BI_FPUTYPE:
157 case BI_MMUTYPE:
158 /* Already set up by head.S */
159 break;
160
161 case BI_MEMCHUNK:
162 if (m68k_num_memory < NUM_MEMINFO) {
163 const struct mem_info *m = data;
164 m68k_memory[m68k_num_memory].addr =
165 be32_to_cpu(m->addr);
166 m68k_memory[m68k_num_memory].size =
167 be32_to_cpu(m->size);
168 m68k_num_memory++;
169 } else
170 pr_warn("%s: too many memory chunks\n",
171 __func__);
172 break;
173
174 case BI_RAMDISK:
175 {
176 const struct mem_info *m = data;
177 m68k_ramdisk.addr = be32_to_cpu(m->addr);
178 m68k_ramdisk.size = be32_to_cpu(m->size);
179 }
180 break;
181
182 case BI_COMMAND_LINE:
183 strlcpy(m68k_command_line, data,
184 sizeof(m68k_command_line));
185 break;
186
187 default:
188 if (MACH_IS_AMIGA)
189 unknown = amiga_parse_bootinfo(record);
190 else if (MACH_IS_ATARI)
191 unknown = atari_parse_bootinfo(record);
192 else if (MACH_IS_MAC)
193 unknown = mac_parse_bootinfo(record);
194 else if (MACH_IS_Q40)
195 unknown = q40_parse_bootinfo(record);
196 else if (MACH_IS_BVME6000)
197 unknown = bvme6000_parse_bootinfo(record);
198 else if (MACH_IS_MVME16x)
199 unknown = mvme16x_parse_bootinfo(record);
200 else if (MACH_IS_MVME147)
201 unknown = mvme147_parse_bootinfo(record);
202 else if (MACH_IS_HP300)
203 unknown = hp300_parse_bootinfo(record);
204 else if (MACH_IS_APOLLO)
205 unknown = apollo_parse_bootinfo(record);
206 else
207 unknown = 1;
208 }
209 if (unknown)
210 pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
211 tag);
212 record = (struct bi_record *)((unsigned long)record + size);
213 }
214
215 m68k_realnum_memory = m68k_num_memory;
216 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
217 if (m68k_num_memory > 1) {
218 pr_warn("%s: ignoring last %i chunks of physical memory\n",
219 __func__, (m68k_num_memory - 1));
220 m68k_num_memory = 1;
221 }
222 #endif
223 }
224
setup_arch(char ** cmdline_p)225 void __init setup_arch(char **cmdline_p)
226 {
227 /* The bootinfo is located right after the kernel */
228 if (!CPU_IS_COLDFIRE)
229 m68k_parse_bootinfo((const struct bi_record *)_end);
230
231 if (CPU_IS_040)
232 m68k_is040or060 = 4;
233 else if (CPU_IS_060)
234 m68k_is040or060 = 6;
235
236 /* FIXME: m68k_fputype is passed in by Penguin booter, which can
237 * be confused by software FPU emulation. BEWARE.
238 * We should really do our own FPU check at startup.
239 * [what do we do with buggy 68LC040s? if we have problems
240 * with them, we should add a test to check_bugs() below] */
241 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
242 /* clear the fpu if we have one */
243 if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
244 volatile int zero = 0;
245 asm volatile ("frestore %0" : : "m" (zero));
246 }
247 #endif
248
249 if (CPU_IS_060) {
250 u32 pcr;
251
252 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
253 : "=d" (pcr));
254 if (((pcr >> 8) & 0xff) <= 5) {
255 pr_warn("Enabling workaround for errata I14\n");
256 asm (".chip 68060; movec %0,%%pcr; .chip 68k"
257 : : "d" (pcr | 0x20));
258 }
259 }
260
261 setup_initial_init_mm((void *)PAGE_OFFSET, _etext, _edata, _end);
262
263 #if defined(CONFIG_BOOTPARAM)
264 strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
265 m68k_command_line[CL_SIZE - 1] = 0;
266 #endif /* CONFIG_BOOTPARAM */
267 process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
268 *cmdline_p = m68k_command_line;
269 memcpy(boot_command_line, *cmdline_p, CL_SIZE);
270
271 parse_early_param();
272
273 switch (m68k_machtype) {
274 #ifdef CONFIG_AMIGA
275 case MACH_AMIGA:
276 config_amiga();
277 break;
278 #endif
279 #ifdef CONFIG_ATARI
280 case MACH_ATARI:
281 config_atari();
282 break;
283 #endif
284 #ifdef CONFIG_MAC
285 case MACH_MAC:
286 config_mac();
287 break;
288 #endif
289 #ifdef CONFIG_SUN3
290 case MACH_SUN3:
291 config_sun3();
292 break;
293 #endif
294 #ifdef CONFIG_APOLLO
295 case MACH_APOLLO:
296 config_apollo();
297 break;
298 #endif
299 #ifdef CONFIG_MVME147
300 case MACH_MVME147:
301 config_mvme147();
302 break;
303 #endif
304 #ifdef CONFIG_MVME16x
305 case MACH_MVME16x:
306 config_mvme16x();
307 break;
308 #endif
309 #ifdef CONFIG_BVME6000
310 case MACH_BVME6000:
311 config_bvme6000();
312 break;
313 #endif
314 #ifdef CONFIG_HP300
315 case MACH_HP300:
316 config_hp300();
317 break;
318 #endif
319 #ifdef CONFIG_Q40
320 case MACH_Q40:
321 config_q40();
322 break;
323 #endif
324 #ifdef CONFIG_SUN3X
325 case MACH_SUN3X:
326 config_sun3x();
327 break;
328 #endif
329 #ifdef CONFIG_COLDFIRE
330 case MACH_M54XX:
331 case MACH_M5441X:
332 cf_bootmem_alloc();
333 cf_mmu_context_init();
334 config_BSP(NULL, 0);
335 break;
336 #endif
337 default:
338 panic("No configuration setup");
339 }
340
341 paging_init();
342
343 #ifdef CONFIG_NATFEAT
344 nf_init();
345 #endif
346
347 #ifndef CONFIG_SUN3
348 #ifdef CONFIG_BLK_DEV_INITRD
349 if (m68k_ramdisk.size) {
350 memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);
351 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
352 initrd_end = initrd_start + m68k_ramdisk.size;
353 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
354 }
355 #endif
356
357 #ifdef CONFIG_ATARI
358 if (MACH_IS_ATARI)
359 atari_stram_reserve_pages((void *)availmem);
360 #endif
361 #ifdef CONFIG_SUN3X
362 if (MACH_IS_SUN3X) {
363 dvma_init();
364 }
365 #endif
366
367 #endif /* !CONFIG_SUN3 */
368
369 /* set ISA defs early as possible */
370 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
371 if (MACH_IS_Q40) {
372 isa_type = ISA_TYPE_Q40;
373 isa_sex = 0;
374 }
375 #ifdef CONFIG_AMIGA_PCMCIA
376 if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
377 isa_type = ISA_TYPE_AG;
378 isa_sex = 1;
379 }
380 #endif
381 #ifdef CONFIG_ATARI_ROM_ISA
382 if (MACH_IS_ATARI) {
383 isa_type = ISA_TYPE_ENEC;
384 isa_sex = 0;
385 }
386 #endif
387 #endif
388 }
389
show_cpuinfo(struct seq_file * m,void * v)390 static int show_cpuinfo(struct seq_file *m, void *v)
391 {
392 const char *cpu, *mmu, *fpu;
393 unsigned long clockfreq, clockfactor;
394
395 #define LOOP_CYCLES_68020 (8)
396 #define LOOP_CYCLES_68030 (8)
397 #define LOOP_CYCLES_68040 (3)
398 #define LOOP_CYCLES_68060 (1)
399 #define LOOP_CYCLES_COLDFIRE (2)
400
401 if (CPU_IS_020) {
402 cpu = "68020";
403 clockfactor = LOOP_CYCLES_68020;
404 } else if (CPU_IS_030) {
405 cpu = "68030";
406 clockfactor = LOOP_CYCLES_68030;
407 } else if (CPU_IS_040) {
408 cpu = "68040";
409 clockfactor = LOOP_CYCLES_68040;
410 } else if (CPU_IS_060) {
411 cpu = "68060";
412 clockfactor = LOOP_CYCLES_68060;
413 } else if (CPU_IS_COLDFIRE) {
414 cpu = "ColdFire";
415 clockfactor = LOOP_CYCLES_COLDFIRE;
416 } else {
417 cpu = "680x0";
418 clockfactor = 0;
419 }
420
421 #ifdef CONFIG_M68KFPU_EMU_ONLY
422 fpu = "none(soft float)";
423 #else
424 if (m68k_fputype & FPU_68881)
425 fpu = "68881";
426 else if (m68k_fputype & FPU_68882)
427 fpu = "68882";
428 else if (m68k_fputype & FPU_68040)
429 fpu = "68040";
430 else if (m68k_fputype & FPU_68060)
431 fpu = "68060";
432 else if (m68k_fputype & FPU_SUNFPA)
433 fpu = "Sun FPA";
434 else if (m68k_fputype & FPU_COLDFIRE)
435 fpu = "ColdFire";
436 else
437 fpu = "none";
438 #endif
439
440 if (m68k_mmutype & MMU_68851)
441 mmu = "68851";
442 else if (m68k_mmutype & MMU_68030)
443 mmu = "68030";
444 else if (m68k_mmutype & MMU_68040)
445 mmu = "68040";
446 else if (m68k_mmutype & MMU_68060)
447 mmu = "68060";
448 else if (m68k_mmutype & MMU_SUN3)
449 mmu = "Sun-3";
450 else if (m68k_mmutype & MMU_APOLLO)
451 mmu = "Apollo";
452 else if (m68k_mmutype & MMU_COLDFIRE)
453 mmu = "ColdFire";
454 else
455 mmu = "unknown";
456
457 clockfreq = loops_per_jiffy * HZ * clockfactor;
458
459 seq_printf(m, "CPU:\t\t%s\n"
460 "MMU:\t\t%s\n"
461 "FPU:\t\t%s\n"
462 "Clocking:\t%lu.%1luMHz\n"
463 "BogoMips:\t%lu.%02lu\n"
464 "Calibration:\t%lu loops\n",
465 cpu, mmu, fpu,
466 clockfreq/1000000,(clockfreq/100000)%10,
467 loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
468 loops_per_jiffy);
469 return 0;
470 }
471
c_start(struct seq_file * m,loff_t * pos)472 static void *c_start(struct seq_file *m, loff_t *pos)
473 {
474 return *pos < 1 ? (void *)1 : NULL;
475 }
c_next(struct seq_file * m,void * v,loff_t * pos)476 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
477 {
478 ++*pos;
479 return NULL;
480 }
c_stop(struct seq_file * m,void * v)481 static void c_stop(struct seq_file *m, void *v)
482 {
483 }
484 const struct seq_operations cpuinfo_op = {
485 .start = c_start,
486 .next = c_next,
487 .stop = c_stop,
488 .show = show_cpuinfo,
489 };
490
491 #ifdef CONFIG_PROC_HARDWARE
hardware_proc_show(struct seq_file * m,void * v)492 static int hardware_proc_show(struct seq_file *m, void *v)
493 {
494 char model[80];
495 unsigned long mem;
496 int i;
497
498 if (mach_get_model)
499 mach_get_model(model);
500 else
501 strcpy(model, "Unknown m68k");
502
503 seq_printf(m, "Model:\t\t%s\n", model);
504 for (mem = 0, i = 0; i < m68k_num_memory; i++)
505 mem += m68k_memory[i].size;
506 seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
507
508 if (mach_get_hardware_list)
509 mach_get_hardware_list(m);
510
511 return 0;
512 }
513
proc_hardware_init(void)514 static int __init proc_hardware_init(void)
515 {
516 proc_create_single("hardware", 0, NULL, hardware_proc_show);
517 return 0;
518 }
519 module_init(proc_hardware_init);
520 #endif
521
check_bugs(void)522 void check_bugs(void)
523 {
524 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
525 if (m68k_fputype == 0) {
526 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
527 "WHICH IS REQUIRED BY LINUX/M68K ***\n");
528 pr_emerg("Upgrade your hardware or join the FPU "
529 "emulation project\n");
530 panic("no FPU");
531 }
532 #endif /* !CONFIG_M68KFPU_EMU */
533 }
534
535 #ifdef CONFIG_ADB
adb_probe_sync_enable(char * str)536 static int __init adb_probe_sync_enable (char *str) {
537 extern int __adb_probe_sync;
538 __adb_probe_sync = 1;
539 return 1;
540 }
541
542 __setup("adb_sync", adb_probe_sync_enable);
543 #endif /* CONFIG_ADB */
544
545 #if IS_ENABLED(CONFIG_NVRAM)
546 #ifdef CONFIG_MAC
m68k_nvram_read_byte(int addr)547 static unsigned char m68k_nvram_read_byte(int addr)
548 {
549 if (MACH_IS_MAC)
550 return mac_pram_read_byte(addr);
551 return 0xff;
552 }
553
m68k_nvram_write_byte(unsigned char val,int addr)554 static void m68k_nvram_write_byte(unsigned char val, int addr)
555 {
556 if (MACH_IS_MAC)
557 mac_pram_write_byte(val, addr);
558 }
559 #endif /* CONFIG_MAC */
560
561 #ifdef CONFIG_ATARI
m68k_nvram_read(char * buf,size_t count,loff_t * ppos)562 static ssize_t m68k_nvram_read(char *buf, size_t count, loff_t *ppos)
563 {
564 if (MACH_IS_ATARI)
565 return atari_nvram_read(buf, count, ppos);
566 else if (MACH_IS_MAC)
567 return nvram_read_bytes(buf, count, ppos);
568 return -EINVAL;
569 }
570
m68k_nvram_write(char * buf,size_t count,loff_t * ppos)571 static ssize_t m68k_nvram_write(char *buf, size_t count, loff_t *ppos)
572 {
573 if (MACH_IS_ATARI)
574 return atari_nvram_write(buf, count, ppos);
575 else if (MACH_IS_MAC)
576 return nvram_write_bytes(buf, count, ppos);
577 return -EINVAL;
578 }
579
m68k_nvram_set_checksum(void)580 static long m68k_nvram_set_checksum(void)
581 {
582 if (MACH_IS_ATARI)
583 return atari_nvram_set_checksum();
584 return -EINVAL;
585 }
586
m68k_nvram_initialize(void)587 static long m68k_nvram_initialize(void)
588 {
589 if (MACH_IS_ATARI)
590 return atari_nvram_initialize();
591 return -EINVAL;
592 }
593 #endif /* CONFIG_ATARI */
594
m68k_nvram_get_size(void)595 static ssize_t m68k_nvram_get_size(void)
596 {
597 if (MACH_IS_ATARI)
598 return atari_nvram_get_size();
599 else if (MACH_IS_MAC)
600 return mac_pram_get_size();
601 return -ENODEV;
602 }
603
604 /* Atari device drivers call .read (to get checksum validation) whereas
605 * Mac and PowerMac device drivers just use .read_byte.
606 */
607 const struct nvram_ops arch_nvram_ops = {
608 #ifdef CONFIG_MAC
609 .read_byte = m68k_nvram_read_byte,
610 .write_byte = m68k_nvram_write_byte,
611 #endif
612 #ifdef CONFIG_ATARI
613 .read = m68k_nvram_read,
614 .write = m68k_nvram_write,
615 .set_checksum = m68k_nvram_set_checksum,
616 .initialize = m68k_nvram_initialize,
617 #endif
618 .get_size = m68k_nvram_get_size,
619 };
620 EXPORT_SYMBOL(arch_nvram_ops);
621 #endif /* CONFIG_NVRAM */
622