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 #ifdef CONFIG_DUMMY_CONSOLE
278 conswitchp = &dummy_con;
279 #endif
280
281 switch (m68k_machtype) {
282 #ifdef CONFIG_AMIGA
283 case MACH_AMIGA:
284 config_amiga();
285 break;
286 #endif
287 #ifdef CONFIG_ATARI
288 case MACH_ATARI:
289 config_atari();
290 break;
291 #endif
292 #ifdef CONFIG_MAC
293 case MACH_MAC:
294 config_mac();
295 break;
296 #endif
297 #ifdef CONFIG_SUN3
298 case MACH_SUN3:
299 config_sun3();
300 break;
301 #endif
302 #ifdef CONFIG_APOLLO
303 case MACH_APOLLO:
304 config_apollo();
305 break;
306 #endif
307 #ifdef CONFIG_MVME147
308 case MACH_MVME147:
309 config_mvme147();
310 break;
311 #endif
312 #ifdef CONFIG_MVME16x
313 case MACH_MVME16x:
314 config_mvme16x();
315 break;
316 #endif
317 #ifdef CONFIG_BVME6000
318 case MACH_BVME6000:
319 config_bvme6000();
320 break;
321 #endif
322 #ifdef CONFIG_HP300
323 case MACH_HP300:
324 config_hp300();
325 break;
326 #endif
327 #ifdef CONFIG_Q40
328 case MACH_Q40:
329 config_q40();
330 break;
331 #endif
332 #ifdef CONFIG_SUN3X
333 case MACH_SUN3X:
334 config_sun3x();
335 break;
336 #endif
337 #ifdef CONFIG_COLDFIRE
338 case MACH_M54XX:
339 case MACH_M5441X:
340 cf_bootmem_alloc();
341 cf_mmu_context_init();
342 config_BSP(NULL, 0);
343 break;
344 #endif
345 default:
346 panic("No configuration setup");
347 }
348
349 paging_init();
350
351 #ifdef CONFIG_NATFEAT
352 nf_init();
353 #endif
354
355 #ifndef CONFIG_SUN3
356 #ifdef CONFIG_BLK_DEV_INITRD
357 if (m68k_ramdisk.size) {
358 memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);
359 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
360 initrd_end = initrd_start + m68k_ramdisk.size;
361 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
362 }
363 #endif
364
365 #ifdef CONFIG_ATARI
366 if (MACH_IS_ATARI)
367 atari_stram_reserve_pages((void *)availmem);
368 #endif
369 #ifdef CONFIG_SUN3X
370 if (MACH_IS_SUN3X) {
371 dvma_init();
372 }
373 #endif
374
375 #endif /* !CONFIG_SUN3 */
376
377 /* set ISA defs early as possible */
378 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
379 if (MACH_IS_Q40) {
380 isa_type = ISA_TYPE_Q40;
381 isa_sex = 0;
382 }
383 #ifdef CONFIG_AMIGA_PCMCIA
384 if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
385 isa_type = ISA_TYPE_AG;
386 isa_sex = 1;
387 }
388 #endif
389 #ifdef CONFIG_ATARI_ROM_ISA
390 if (MACH_IS_ATARI) {
391 isa_type = ISA_TYPE_ENEC;
392 isa_sex = 0;
393 }
394 #endif
395 #endif
396 }
397
show_cpuinfo(struct seq_file * m,void * v)398 static int show_cpuinfo(struct seq_file *m, void *v)
399 {
400 const char *cpu, *mmu, *fpu;
401 unsigned long clockfreq, clockfactor;
402
403 #define LOOP_CYCLES_68020 (8)
404 #define LOOP_CYCLES_68030 (8)
405 #define LOOP_CYCLES_68040 (3)
406 #define LOOP_CYCLES_68060 (1)
407 #define LOOP_CYCLES_COLDFIRE (2)
408
409 if (CPU_IS_020) {
410 cpu = "68020";
411 clockfactor = LOOP_CYCLES_68020;
412 } else if (CPU_IS_030) {
413 cpu = "68030";
414 clockfactor = LOOP_CYCLES_68030;
415 } else if (CPU_IS_040) {
416 cpu = "68040";
417 clockfactor = LOOP_CYCLES_68040;
418 } else if (CPU_IS_060) {
419 cpu = "68060";
420 clockfactor = LOOP_CYCLES_68060;
421 } else if (CPU_IS_COLDFIRE) {
422 cpu = "ColdFire";
423 clockfactor = LOOP_CYCLES_COLDFIRE;
424 } else {
425 cpu = "680x0";
426 clockfactor = 0;
427 }
428
429 #ifdef CONFIG_M68KFPU_EMU_ONLY
430 fpu = "none(soft float)";
431 #else
432 if (m68k_fputype & FPU_68881)
433 fpu = "68881";
434 else if (m68k_fputype & FPU_68882)
435 fpu = "68882";
436 else if (m68k_fputype & FPU_68040)
437 fpu = "68040";
438 else if (m68k_fputype & FPU_68060)
439 fpu = "68060";
440 else if (m68k_fputype & FPU_SUNFPA)
441 fpu = "Sun FPA";
442 else if (m68k_fputype & FPU_COLDFIRE)
443 fpu = "ColdFire";
444 else
445 fpu = "none";
446 #endif
447
448 if (m68k_mmutype & MMU_68851)
449 mmu = "68851";
450 else if (m68k_mmutype & MMU_68030)
451 mmu = "68030";
452 else if (m68k_mmutype & MMU_68040)
453 mmu = "68040";
454 else if (m68k_mmutype & MMU_68060)
455 mmu = "68060";
456 else if (m68k_mmutype & MMU_SUN3)
457 mmu = "Sun-3";
458 else if (m68k_mmutype & MMU_APOLLO)
459 mmu = "Apollo";
460 else if (m68k_mmutype & MMU_COLDFIRE)
461 mmu = "ColdFire";
462 else
463 mmu = "unknown";
464
465 clockfreq = loops_per_jiffy * HZ * clockfactor;
466
467 seq_printf(m, "CPU:\t\t%s\n"
468 "MMU:\t\t%s\n"
469 "FPU:\t\t%s\n"
470 "Clocking:\t%lu.%1luMHz\n"
471 "BogoMips:\t%lu.%02lu\n"
472 "Calibration:\t%lu loops\n",
473 cpu, mmu, fpu,
474 clockfreq/1000000,(clockfreq/100000)%10,
475 loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
476 loops_per_jiffy);
477 return 0;
478 }
479
c_start(struct seq_file * m,loff_t * pos)480 static void *c_start(struct seq_file *m, loff_t *pos)
481 {
482 return *pos < 1 ? (void *)1 : NULL;
483 }
c_next(struct seq_file * m,void * v,loff_t * pos)484 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
485 {
486 ++*pos;
487 return NULL;
488 }
c_stop(struct seq_file * m,void * v)489 static void c_stop(struct seq_file *m, void *v)
490 {
491 }
492 const struct seq_operations cpuinfo_op = {
493 .start = c_start,
494 .next = c_next,
495 .stop = c_stop,
496 .show = show_cpuinfo,
497 };
498
499 #ifdef CONFIG_PROC_HARDWARE
hardware_proc_show(struct seq_file * m,void * v)500 static int hardware_proc_show(struct seq_file *m, void *v)
501 {
502 char model[80];
503 unsigned long mem;
504 int i;
505
506 if (mach_get_model)
507 mach_get_model(model);
508 else
509 strcpy(model, "Unknown m68k");
510
511 seq_printf(m, "Model:\t\t%s\n", model);
512 for (mem = 0, i = 0; i < m68k_num_memory; i++)
513 mem += m68k_memory[i].size;
514 seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
515
516 if (mach_get_hardware_list)
517 mach_get_hardware_list(m);
518
519 return 0;
520 }
521
proc_hardware_init(void)522 static int __init proc_hardware_init(void)
523 {
524 proc_create_single("hardware", 0, NULL, hardware_proc_show);
525 return 0;
526 }
527 module_init(proc_hardware_init);
528 #endif
529
check_bugs(void)530 void check_bugs(void)
531 {
532 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
533 if (m68k_fputype == 0) {
534 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
535 "WHICH IS REQUIRED BY LINUX/M68K ***\n");
536 pr_emerg("Upgrade your hardware or join the FPU "
537 "emulation project\n");
538 panic("no FPU");
539 }
540 #endif /* !CONFIG_M68KFPU_EMU */
541 }
542
543 #ifdef CONFIG_ADB
adb_probe_sync_enable(char * str)544 static int __init adb_probe_sync_enable (char *str) {
545 extern int __adb_probe_sync;
546 __adb_probe_sync = 1;
547 return 1;
548 }
549
550 __setup("adb_sync", adb_probe_sync_enable);
551 #endif /* CONFIG_ADB */
552
553 #if IS_ENABLED(CONFIG_NVRAM)
554 #ifdef CONFIG_MAC
m68k_nvram_read_byte(int addr)555 static unsigned char m68k_nvram_read_byte(int addr)
556 {
557 if (MACH_IS_MAC)
558 return mac_pram_read_byte(addr);
559 return 0xff;
560 }
561
m68k_nvram_write_byte(unsigned char val,int addr)562 static void m68k_nvram_write_byte(unsigned char val, int addr)
563 {
564 if (MACH_IS_MAC)
565 mac_pram_write_byte(val, addr);
566 }
567 #endif /* CONFIG_MAC */
568
569 #ifdef CONFIG_ATARI
m68k_nvram_read(char * buf,size_t count,loff_t * ppos)570 static ssize_t m68k_nvram_read(char *buf, size_t count, loff_t *ppos)
571 {
572 if (MACH_IS_ATARI)
573 return atari_nvram_read(buf, count, ppos);
574 else if (MACH_IS_MAC)
575 return nvram_read_bytes(buf, count, ppos);
576 return -EINVAL;
577 }
578
m68k_nvram_write(char * buf,size_t count,loff_t * ppos)579 static ssize_t m68k_nvram_write(char *buf, size_t count, loff_t *ppos)
580 {
581 if (MACH_IS_ATARI)
582 return atari_nvram_write(buf, count, ppos);
583 else if (MACH_IS_MAC)
584 return nvram_write_bytes(buf, count, ppos);
585 return -EINVAL;
586 }
587
m68k_nvram_set_checksum(void)588 static long m68k_nvram_set_checksum(void)
589 {
590 if (MACH_IS_ATARI)
591 return atari_nvram_set_checksum();
592 return -EINVAL;
593 }
594
m68k_nvram_initialize(void)595 static long m68k_nvram_initialize(void)
596 {
597 if (MACH_IS_ATARI)
598 return atari_nvram_initialize();
599 return -EINVAL;
600 }
601 #endif /* CONFIG_ATARI */
602
m68k_nvram_get_size(void)603 static ssize_t m68k_nvram_get_size(void)
604 {
605 if (MACH_IS_ATARI)
606 return atari_nvram_get_size();
607 else if (MACH_IS_MAC)
608 return mac_pram_get_size();
609 return -ENODEV;
610 }
611
612 /* Atari device drivers call .read (to get checksum validation) whereas
613 * Mac and PowerMac device drivers just use .read_byte.
614 */
615 const struct nvram_ops arch_nvram_ops = {
616 #ifdef CONFIG_MAC
617 .read_byte = m68k_nvram_read_byte,
618 .write_byte = m68k_nvram_write_byte,
619 #endif
620 #ifdef CONFIG_ATARI
621 .read = m68k_nvram_read,
622 .write = m68k_nvram_write,
623 .set_checksum = m68k_nvram_set_checksum,
624 .initialize = m68k_nvram_initialize,
625 #endif
626 .get_size = m68k_nvram_get_size,
627 };
628 EXPORT_SYMBOL(arch_nvram_ops);
629 #endif /* CONFIG_NVRAM */
630
