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) (irq_handler_t handler) __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 long mach_max_dma_address = 0x00ffffff; /* default set to the lower 16MB */
103 #ifdef CONFIG_HEARTBEAT
104 void (*mach_heartbeat) (int);
105 EXPORT_SYMBOL(mach_heartbeat);
106 #endif
107 #ifdef CONFIG_M68K_L2_CACHE
108 void (*mach_l2_flush) (int);
109 #endif
110 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
111 int isa_type;
112 int isa_sex;
113 EXPORT_SYMBOL(isa_type);
114 EXPORT_SYMBOL(isa_sex);
115 #endif
116
117 extern int amiga_parse_bootinfo(const struct bi_record *);
118 extern int atari_parse_bootinfo(const struct bi_record *);
119 extern int mac_parse_bootinfo(const struct bi_record *);
120 extern int q40_parse_bootinfo(const struct bi_record *);
121 extern int bvme6000_parse_bootinfo(const struct bi_record *);
122 extern int mvme16x_parse_bootinfo(const struct bi_record *);
123 extern int mvme147_parse_bootinfo(const struct bi_record *);
124 extern int hp300_parse_bootinfo(const struct bi_record *);
125 extern int apollo_parse_bootinfo(const struct bi_record *);
126
127 extern void config_amiga(void);
128 extern void config_atari(void);
129 extern void config_mac(void);
130 extern void config_sun3(void);
131 extern void config_apollo(void);
132 extern void config_mvme147(void);
133 extern void config_mvme16x(void);
134 extern void config_bvme6000(void);
135 extern void config_hp300(void);
136 extern void config_q40(void);
137 extern void config_sun3x(void);
138
139 #define MASK_256K 0xfffc0000
140
141 extern void paging_init(void);
142
m68k_parse_bootinfo(const struct bi_record * record)143 static void __init m68k_parse_bootinfo(const struct bi_record *record)
144 {
145 uint16_t tag;
146
147 save_bootinfo(record);
148
149 while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
150 int unknown = 0;
151 const void *data = record->data;
152 uint16_t size = be16_to_cpu(record->size);
153
154 switch (tag) {
155 case BI_MACHTYPE:
156 case BI_CPUTYPE:
157 case BI_FPUTYPE:
158 case BI_MMUTYPE:
159 /* Already set up by head.S */
160 break;
161
162 case BI_MEMCHUNK:
163 if (m68k_num_memory < NUM_MEMINFO) {
164 const struct mem_info *m = data;
165 m68k_memory[m68k_num_memory].addr =
166 be32_to_cpu(m->addr);
167 m68k_memory[m68k_num_memory].size =
168 be32_to_cpu(m->size);
169 m68k_num_memory++;
170 } else
171 pr_warn("%s: too many memory chunks\n",
172 __func__);
173 break;
174
175 case BI_RAMDISK:
176 {
177 const struct mem_info *m = data;
178 m68k_ramdisk.addr = be32_to_cpu(m->addr);
179 m68k_ramdisk.size = be32_to_cpu(m->size);
180 }
181 break;
182
183 case BI_COMMAND_LINE:
184 strlcpy(m68k_command_line, data,
185 sizeof(m68k_command_line));
186 break;
187
188 default:
189 if (MACH_IS_AMIGA)
190 unknown = amiga_parse_bootinfo(record);
191 else if (MACH_IS_ATARI)
192 unknown = atari_parse_bootinfo(record);
193 else if (MACH_IS_MAC)
194 unknown = mac_parse_bootinfo(record);
195 else if (MACH_IS_Q40)
196 unknown = q40_parse_bootinfo(record);
197 else if (MACH_IS_BVME6000)
198 unknown = bvme6000_parse_bootinfo(record);
199 else if (MACH_IS_MVME16x)
200 unknown = mvme16x_parse_bootinfo(record);
201 else if (MACH_IS_MVME147)
202 unknown = mvme147_parse_bootinfo(record);
203 else if (MACH_IS_HP300)
204 unknown = hp300_parse_bootinfo(record);
205 else if (MACH_IS_APOLLO)
206 unknown = apollo_parse_bootinfo(record);
207 else
208 unknown = 1;
209 }
210 if (unknown)
211 pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
212 tag);
213 record = (struct bi_record *)((unsigned long)record + size);
214 }
215
216 m68k_realnum_memory = m68k_num_memory;
217 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
218 if (m68k_num_memory > 1) {
219 pr_warn("%s: ignoring last %i chunks of physical memory\n",
220 __func__, (m68k_num_memory - 1));
221 m68k_num_memory = 1;
222 }
223 #endif
224 }
225
setup_arch(char ** cmdline_p)226 void __init setup_arch(char **cmdline_p)
227 {
228 /* The bootinfo is located right after the kernel */
229 if (!CPU_IS_COLDFIRE)
230 m68k_parse_bootinfo((const struct bi_record *)_end);
231
232 if (CPU_IS_040)
233 m68k_is040or060 = 4;
234 else if (CPU_IS_060)
235 m68k_is040or060 = 6;
236
237 /* FIXME: m68k_fputype is passed in by Penguin booter, which can
238 * be confused by software FPU emulation. BEWARE.
239 * We should really do our own FPU check at startup.
240 * [what do we do with buggy 68LC040s? if we have problems
241 * with them, we should add a test to check_bugs() below] */
242 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
243 /* clear the fpu if we have one */
244 if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
245 volatile int zero = 0;
246 asm volatile ("frestore %0" : : "m" (zero));
247 }
248 #endif
249
250 if (CPU_IS_060) {
251 u32 pcr;
252
253 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
254 : "=d" (pcr));
255 if (((pcr >> 8) & 0xff) <= 5) {
256 pr_warn("Enabling workaround for errata I14\n");
257 asm (".chip 68060; movec %0,%%pcr; .chip 68k"
258 : : "d" (pcr | 0x20));
259 }
260 }
261
262 init_mm.start_code = PAGE_OFFSET;
263 init_mm.end_code = (unsigned long)_etext;
264 init_mm.end_data = (unsigned long)_edata;
265 init_mm.brk = (unsigned long)_end;
266
267 #if defined(CONFIG_BOOTPARAM)
268 strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
269 m68k_command_line[CL_SIZE - 1] = 0;
270 #endif /* CONFIG_BOOTPARAM */
271 process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
272 *cmdline_p = m68k_command_line;
273 memcpy(boot_command_line, *cmdline_p, CL_SIZE);
274
275 parse_early_param();
276
277 switch (m68k_machtype) {
278 #ifdef CONFIG_AMIGA
279 case MACH_AMIGA:
280 config_amiga();
281 break;
282 #endif
283 #ifdef CONFIG_ATARI
284 case MACH_ATARI:
285 config_atari();
286 break;
287 #endif
288 #ifdef CONFIG_MAC
289 case MACH_MAC:
290 config_mac();
291 break;
292 #endif
293 #ifdef CONFIG_SUN3
294 case MACH_SUN3:
295 config_sun3();
296 break;
297 #endif
298 #ifdef CONFIG_APOLLO
299 case MACH_APOLLO:
300 config_apollo();
301 break;
302 #endif
303 #ifdef CONFIG_MVME147
304 case MACH_MVME147:
305 config_mvme147();
306 break;
307 #endif
308 #ifdef CONFIG_MVME16x
309 case MACH_MVME16x:
310 config_mvme16x();
311 break;
312 #endif
313 #ifdef CONFIG_BVME6000
314 case MACH_BVME6000:
315 config_bvme6000();
316 break;
317 #endif
318 #ifdef CONFIG_HP300
319 case MACH_HP300:
320 config_hp300();
321 break;
322 #endif
323 #ifdef CONFIG_Q40
324 case MACH_Q40:
325 config_q40();
326 break;
327 #endif
328 #ifdef CONFIG_SUN3X
329 case MACH_SUN3X:
330 config_sun3x();
331 break;
332 #endif
333 #ifdef CONFIG_COLDFIRE
334 case MACH_M54XX:
335 case MACH_M5441X:
336 cf_bootmem_alloc();
337 cf_mmu_context_init();
338 config_BSP(NULL, 0);
339 break;
340 #endif
341 default:
342 panic("No configuration setup");
343 }
344
345 paging_init();
346
347 #ifdef CONFIG_NATFEAT
348 nf_init();
349 #endif
350
351 #ifndef CONFIG_SUN3
352 #ifdef CONFIG_BLK_DEV_INITRD
353 if (m68k_ramdisk.size) {
354 memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);
355 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
356 initrd_end = initrd_start + m68k_ramdisk.size;
357 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
358 }
359 #endif
360
361 #ifdef CONFIG_ATARI
362 if (MACH_IS_ATARI)
363 atari_stram_reserve_pages((void *)availmem);
364 #endif
365 #ifdef CONFIG_SUN3X
366 if (MACH_IS_SUN3X) {
367 dvma_init();
368 }
369 #endif
370
371 #endif /* !CONFIG_SUN3 */
372
373 /* set ISA defs early as possible */
374 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
375 if (MACH_IS_Q40) {
376 isa_type = ISA_TYPE_Q40;
377 isa_sex = 0;
378 }
379 #ifdef CONFIG_AMIGA_PCMCIA
380 if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
381 isa_type = ISA_TYPE_AG;
382 isa_sex = 1;
383 }
384 #endif
385 #ifdef CONFIG_ATARI_ROM_ISA
386 if (MACH_IS_ATARI) {
387 isa_type = ISA_TYPE_ENEC;
388 isa_sex = 0;
389 }
390 #endif
391 #endif
392 }
393
show_cpuinfo(struct seq_file * m,void * v)394 static int show_cpuinfo(struct seq_file *m, void *v)
395 {
396 const char *cpu, *mmu, *fpu;
397 unsigned long clockfreq, clockfactor;
398
399 #define LOOP_CYCLES_68020 (8)
400 #define LOOP_CYCLES_68030 (8)
401 #define LOOP_CYCLES_68040 (3)
402 #define LOOP_CYCLES_68060 (1)
403 #define LOOP_CYCLES_COLDFIRE (2)
404
405 if (CPU_IS_020) {
406 cpu = "68020";
407 clockfactor = LOOP_CYCLES_68020;
408 } else if (CPU_IS_030) {
409 cpu = "68030";
410 clockfactor = LOOP_CYCLES_68030;
411 } else if (CPU_IS_040) {
412 cpu = "68040";
413 clockfactor = LOOP_CYCLES_68040;
414 } else if (CPU_IS_060) {
415 cpu = "68060";
416 clockfactor = LOOP_CYCLES_68060;
417 } else if (CPU_IS_COLDFIRE) {
418 cpu = "ColdFire";
419 clockfactor = LOOP_CYCLES_COLDFIRE;
420 } else {
421 cpu = "680x0";
422 clockfactor = 0;
423 }
424
425 #ifdef CONFIG_M68KFPU_EMU_ONLY
426 fpu = "none(soft float)";
427 #else
428 if (m68k_fputype & FPU_68881)
429 fpu = "68881";
430 else if (m68k_fputype & FPU_68882)
431 fpu = "68882";
432 else if (m68k_fputype & FPU_68040)
433 fpu = "68040";
434 else if (m68k_fputype & FPU_68060)
435 fpu = "68060";
436 else if (m68k_fputype & FPU_SUNFPA)
437 fpu = "Sun FPA";
438 else if (m68k_fputype & FPU_COLDFIRE)
439 fpu = "ColdFire";
440 else
441 fpu = "none";
442 #endif
443
444 if (m68k_mmutype & MMU_68851)
445 mmu = "68851";
446 else if (m68k_mmutype & MMU_68030)
447 mmu = "68030";
448 else if (m68k_mmutype & MMU_68040)
449 mmu = "68040";
450 else if (m68k_mmutype & MMU_68060)
451 mmu = "68060";
452 else if (m68k_mmutype & MMU_SUN3)
453 mmu = "Sun-3";
454 else if (m68k_mmutype & MMU_APOLLO)
455 mmu = "Apollo";
456 else if (m68k_mmutype & MMU_COLDFIRE)
457 mmu = "ColdFire";
458 else
459 mmu = "unknown";
460
461 clockfreq = loops_per_jiffy * HZ * clockfactor;
462
463 seq_printf(m, "CPU:\t\t%s\n"
464 "MMU:\t\t%s\n"
465 "FPU:\t\t%s\n"
466 "Clocking:\t%lu.%1luMHz\n"
467 "BogoMips:\t%lu.%02lu\n"
468 "Calibration:\t%lu loops\n",
469 cpu, mmu, fpu,
470 clockfreq/1000000,(clockfreq/100000)%10,
471 loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
472 loops_per_jiffy);
473 return 0;
474 }
475
c_start(struct seq_file * m,loff_t * pos)476 static void *c_start(struct seq_file *m, loff_t *pos)
477 {
478 return *pos < 1 ? (void *)1 : NULL;
479 }
c_next(struct seq_file * m,void * v,loff_t * pos)480 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
481 {
482 ++*pos;
483 return NULL;
484 }
c_stop(struct seq_file * m,void * v)485 static void c_stop(struct seq_file *m, void *v)
486 {
487 }
488 const struct seq_operations cpuinfo_op = {
489 .start = c_start,
490 .next = c_next,
491 .stop = c_stop,
492 .show = show_cpuinfo,
493 };
494
495 #ifdef CONFIG_PROC_HARDWARE
hardware_proc_show(struct seq_file * m,void * v)496 static int hardware_proc_show(struct seq_file *m, void *v)
497 {
498 char model[80];
499 unsigned long mem;
500 int i;
501
502 if (mach_get_model)
503 mach_get_model(model);
504 else
505 strcpy(model, "Unknown m68k");
506
507 seq_printf(m, "Model:\t\t%s\n", model);
508 for (mem = 0, i = 0; i < m68k_num_memory; i++)
509 mem += m68k_memory[i].size;
510 seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
511
512 if (mach_get_hardware_list)
513 mach_get_hardware_list(m);
514
515 return 0;
516 }
517
proc_hardware_init(void)518 static int __init proc_hardware_init(void)
519 {
520 proc_create_single("hardware", 0, NULL, hardware_proc_show);
521 return 0;
522 }
523 module_init(proc_hardware_init);
524 #endif
525
check_bugs(void)526 void check_bugs(void)
527 {
528 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
529 if (m68k_fputype == 0) {
530 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
531 "WHICH IS REQUIRED BY LINUX/M68K ***\n");
532 pr_emerg("Upgrade your hardware or join the FPU "
533 "emulation project\n");
534 panic("no FPU");
535 }
536 #endif /* !CONFIG_M68KFPU_EMU */
537 }
538
539 #ifdef CONFIG_ADB
adb_probe_sync_enable(char * str)540 static int __init adb_probe_sync_enable (char *str) {
541 extern int __adb_probe_sync;
542 __adb_probe_sync = 1;
543 return 1;
544 }
545
546 __setup("adb_sync", adb_probe_sync_enable);
547 #endif /* CONFIG_ADB */
548
549 #if IS_ENABLED(CONFIG_NVRAM)
550 #ifdef CONFIG_MAC
m68k_nvram_read_byte(int addr)551 static unsigned char m68k_nvram_read_byte(int addr)
552 {
553 if (MACH_IS_MAC)
554 return mac_pram_read_byte(addr);
555 return 0xff;
556 }
557
m68k_nvram_write_byte(unsigned char val,int addr)558 static void m68k_nvram_write_byte(unsigned char val, int addr)
559 {
560 if (MACH_IS_MAC)
561 mac_pram_write_byte(val, addr);
562 }
563 #endif /* CONFIG_MAC */
564
565 #ifdef CONFIG_ATARI
m68k_nvram_read(char * buf,size_t count,loff_t * ppos)566 static ssize_t m68k_nvram_read(char *buf, size_t count, loff_t *ppos)
567 {
568 if (MACH_IS_ATARI)
569 return atari_nvram_read(buf, count, ppos);
570 else if (MACH_IS_MAC)
571 return nvram_read_bytes(buf, count, ppos);
572 return -EINVAL;
573 }
574
m68k_nvram_write(char * buf,size_t count,loff_t * ppos)575 static ssize_t m68k_nvram_write(char *buf, size_t count, loff_t *ppos)
576 {
577 if (MACH_IS_ATARI)
578 return atari_nvram_write(buf, count, ppos);
579 else if (MACH_IS_MAC)
580 return nvram_write_bytes(buf, count, ppos);
581 return -EINVAL;
582 }
583
m68k_nvram_set_checksum(void)584 static long m68k_nvram_set_checksum(void)
585 {
586 if (MACH_IS_ATARI)
587 return atari_nvram_set_checksum();
588 return -EINVAL;
589 }
590
m68k_nvram_initialize(void)591 static long m68k_nvram_initialize(void)
592 {
593 if (MACH_IS_ATARI)
594 return atari_nvram_initialize();
595 return -EINVAL;
596 }
597 #endif /* CONFIG_ATARI */
598
m68k_nvram_get_size(void)599 static ssize_t m68k_nvram_get_size(void)
600 {
601 if (MACH_IS_ATARI)
602 return atari_nvram_get_size();
603 else if (MACH_IS_MAC)
604 return mac_pram_get_size();
605 return -ENODEV;
606 }
607
608 /* Atari device drivers call .read (to get checksum validation) whereas
609 * Mac and PowerMac device drivers just use .read_byte.
610 */
611 const struct nvram_ops arch_nvram_ops = {
612 #ifdef CONFIG_MAC
613 .read_byte = m68k_nvram_read_byte,
614 .write_byte = m68k_nvram_write_byte,
615 #endif
616 #ifdef CONFIG_ATARI
617 .read = m68k_nvram_read,
618 .write = m68k_nvram_write,
619 .set_checksum = m68k_nvram_set_checksum,
620 .initialize = m68k_nvram_initialize,
621 #endif
622 .get_size = m68k_nvram_get_size,
623 };
624 EXPORT_SYMBOL(arch_nvram_ops);
625 #endif /* CONFIG_NVRAM */
626