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/genhd.h>
21 #include <linux/errno.h>
22 #include <linux/string.h>
23 #include <linux/init.h>
24 #include <linux/memblock.h>
25 #include <linux/proc_fs.h>
26 #include <linux/seq_file.h>
27 #include <linux/module.h>
28 #include <linux/nvram.h>
29 #include <linux/initrd.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
52 #if !FPSTATESIZE || !NR_IRQS
53 #warning No CPU/platform type selected, your kernel will not work!
54 #warning Are you building an allnoconfig kernel?
55 #endif
56
57 unsigned long m68k_machtype;
58 EXPORT_SYMBOL(m68k_machtype);
59 unsigned long m68k_cputype;
60 EXPORT_SYMBOL(m68k_cputype);
61 unsigned long m68k_fputype;
62 unsigned long m68k_mmutype;
63 EXPORT_SYMBOL(m68k_mmutype);
64 #ifdef CONFIG_VME
65 unsigned long vme_brdtype;
66 EXPORT_SYMBOL(vme_brdtype);
67 #endif
68
69 int m68k_is040or060;
70 EXPORT_SYMBOL(m68k_is040or060);
71
72 extern unsigned long availmem;
73
74 int m68k_num_memory;
75 EXPORT_SYMBOL(m68k_num_memory);
76 int m68k_realnum_memory;
77 EXPORT_SYMBOL(m68k_realnum_memory);
78 unsigned long m68k_memoffset;
79 struct m68k_mem_info m68k_memory[NUM_MEMINFO];
80 EXPORT_SYMBOL(m68k_memory);
81
82 static struct m68k_mem_info m68k_ramdisk __initdata;
83
84 static char m68k_command_line[CL_SIZE] __initdata;
85
86 void (*mach_sched_init) (irq_handler_t handler) __initdata = NULL;
87 /* machine dependent irq functions */
88 void (*mach_init_IRQ) (void) __initdata = NULL;
89 void (*mach_get_model) (char *model);
90 void (*mach_get_hardware_list) (struct seq_file *m);
91 /* machine dependent timer functions */
92 int (*mach_hwclk) (int, struct rtc_time*);
93 EXPORT_SYMBOL(mach_hwclk);
94 unsigned int (*mach_get_ss)(void);
95 int (*mach_get_rtc_pll)(struct rtc_pll_info *);
96 int (*mach_set_rtc_pll)(struct rtc_pll_info *);
97 EXPORT_SYMBOL(mach_get_ss);
98 EXPORT_SYMBOL(mach_get_rtc_pll);
99 EXPORT_SYMBOL(mach_set_rtc_pll);
100 void (*mach_reset)( void );
101 void (*mach_halt)( void );
102 void (*mach_power_off)( void );
103 long mach_max_dma_address = 0x00ffffff; /* default set to the lower 16MB */
104 #ifdef CONFIG_HEARTBEAT
105 void (*mach_heartbeat) (int);
106 EXPORT_SYMBOL(mach_heartbeat);
107 #endif
108 #ifdef CONFIG_M68K_L2_CACHE
109 void (*mach_l2_flush) (int);
110 #endif
111 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
112 int isa_type;
113 int isa_sex;
114 EXPORT_SYMBOL(isa_type);
115 EXPORT_SYMBOL(isa_sex);
116 #endif
117
118 extern int amiga_parse_bootinfo(const struct bi_record *);
119 extern int atari_parse_bootinfo(const struct bi_record *);
120 extern int mac_parse_bootinfo(const struct bi_record *);
121 extern int q40_parse_bootinfo(const struct bi_record *);
122 extern int bvme6000_parse_bootinfo(const struct bi_record *);
123 extern int mvme16x_parse_bootinfo(const struct bi_record *);
124 extern int mvme147_parse_bootinfo(const struct bi_record *);
125 extern int hp300_parse_bootinfo(const struct bi_record *);
126 extern int apollo_parse_bootinfo(const struct bi_record *);
127
128 extern void config_amiga(void);
129 extern void config_atari(void);
130 extern void config_mac(void);
131 extern void config_sun3(void);
132 extern void config_apollo(void);
133 extern void config_mvme147(void);
134 extern void config_mvme16x(void);
135 extern void config_bvme6000(void);
136 extern void config_hp300(void);
137 extern void config_q40(void);
138 extern void config_sun3x(void);
139
140 #define MASK_256K 0xfffc0000
141
142 extern void paging_init(void);
143
m68k_parse_bootinfo(const struct bi_record * record)144 static void __init m68k_parse_bootinfo(const struct bi_record *record)
145 {
146 uint16_t tag;
147
148 save_bootinfo(record);
149
150 while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
151 int unknown = 0;
152 const void *data = record->data;
153 uint16_t size = be16_to_cpu(record->size);
154
155 switch (tag) {
156 case BI_MACHTYPE:
157 case BI_CPUTYPE:
158 case BI_FPUTYPE:
159 case BI_MMUTYPE:
160 /* Already set up by head.S */
161 break;
162
163 case BI_MEMCHUNK:
164 if (m68k_num_memory < NUM_MEMINFO) {
165 const struct mem_info *m = data;
166 m68k_memory[m68k_num_memory].addr =
167 be32_to_cpu(m->addr);
168 m68k_memory[m68k_num_memory].size =
169 be32_to_cpu(m->size);
170 m68k_num_memory++;
171 } else
172 pr_warn("%s: too many memory chunks\n",
173 __func__);
174 break;
175
176 case BI_RAMDISK:
177 {
178 const struct mem_info *m = data;
179 m68k_ramdisk.addr = be32_to_cpu(m->addr);
180 m68k_ramdisk.size = be32_to_cpu(m->size);
181 }
182 break;
183
184 case BI_COMMAND_LINE:
185 strlcpy(m68k_command_line, data,
186 sizeof(m68k_command_line));
187 break;
188
189 default:
190 if (MACH_IS_AMIGA)
191 unknown = amiga_parse_bootinfo(record);
192 else if (MACH_IS_ATARI)
193 unknown = atari_parse_bootinfo(record);
194 else if (MACH_IS_MAC)
195 unknown = mac_parse_bootinfo(record);
196 else if (MACH_IS_Q40)
197 unknown = q40_parse_bootinfo(record);
198 else if (MACH_IS_BVME6000)
199 unknown = bvme6000_parse_bootinfo(record);
200 else if (MACH_IS_MVME16x)
201 unknown = mvme16x_parse_bootinfo(record);
202 else if (MACH_IS_MVME147)
203 unknown = mvme147_parse_bootinfo(record);
204 else if (MACH_IS_HP300)
205 unknown = hp300_parse_bootinfo(record);
206 else if (MACH_IS_APOLLO)
207 unknown = apollo_parse_bootinfo(record);
208 else
209 unknown = 1;
210 }
211 if (unknown)
212 pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
213 tag);
214 record = (struct bi_record *)((unsigned long)record + size);
215 }
216
217 m68k_realnum_memory = m68k_num_memory;
218 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
219 if (m68k_num_memory > 1) {
220 pr_warn("%s: ignoring last %i chunks of physical memory\n",
221 __func__, (m68k_num_memory - 1));
222 m68k_num_memory = 1;
223 }
224 #endif
225 }
226
setup_arch(char ** cmdline_p)227 void __init setup_arch(char **cmdline_p)
228 {
229 /* The bootinfo is located right after the kernel */
230 if (!CPU_IS_COLDFIRE)
231 m68k_parse_bootinfo((const struct bi_record *)_end);
232
233 if (CPU_IS_040)
234 m68k_is040or060 = 4;
235 else if (CPU_IS_060)
236 m68k_is040or060 = 6;
237
238 /* FIXME: m68k_fputype is passed in by Penguin booter, which can
239 * be confused by software FPU emulation. BEWARE.
240 * We should really do our own FPU check at startup.
241 * [what do we do with buggy 68LC040s? if we have problems
242 * with them, we should add a test to check_bugs() below] */
243 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
244 /* clear the fpu if we have one */
245 if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
246 volatile int zero = 0;
247 asm volatile ("frestore %0" : : "m" (zero));
248 }
249 #endif
250
251 if (CPU_IS_060) {
252 u32 pcr;
253
254 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
255 : "=d" (pcr));
256 if (((pcr >> 8) & 0xff) <= 5) {
257 pr_warn("Enabling workaround for errata I14\n");
258 asm (".chip 68060; movec %0,%%pcr; .chip 68k"
259 : : "d" (pcr | 0x20));
260 }
261 }
262
263 init_mm.start_code = PAGE_OFFSET;
264 init_mm.end_code = (unsigned long)_etext;
265 init_mm.end_data = (unsigned long)_edata;
266 init_mm.brk = (unsigned long)_end;
267
268 #if defined(CONFIG_BOOTPARAM)
269 strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
270 m68k_command_line[CL_SIZE - 1] = 0;
271 #endif /* CONFIG_BOOTPARAM */
272 process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
273 *cmdline_p = m68k_command_line;
274 memcpy(boot_command_line, *cmdline_p, CL_SIZE);
275
276 parse_early_param();
277
278 switch (m68k_machtype) {
279 #ifdef CONFIG_AMIGA
280 case MACH_AMIGA:
281 config_amiga();
282 break;
283 #endif
284 #ifdef CONFIG_ATARI
285 case MACH_ATARI:
286 config_atari();
287 break;
288 #endif
289 #ifdef CONFIG_MAC
290 case MACH_MAC:
291 config_mac();
292 break;
293 #endif
294 #ifdef CONFIG_SUN3
295 case MACH_SUN3:
296 config_sun3();
297 break;
298 #endif
299 #ifdef CONFIG_APOLLO
300 case MACH_APOLLO:
301 config_apollo();
302 break;
303 #endif
304 #ifdef CONFIG_MVME147
305 case MACH_MVME147:
306 config_mvme147();
307 break;
308 #endif
309 #ifdef CONFIG_MVME16x
310 case MACH_MVME16x:
311 config_mvme16x();
312 break;
313 #endif
314 #ifdef CONFIG_BVME6000
315 case MACH_BVME6000:
316 config_bvme6000();
317 break;
318 #endif
319 #ifdef CONFIG_HP300
320 case MACH_HP300:
321 config_hp300();
322 break;
323 #endif
324 #ifdef CONFIG_Q40
325 case MACH_Q40:
326 config_q40();
327 break;
328 #endif
329 #ifdef CONFIG_SUN3X
330 case MACH_SUN3X:
331 config_sun3x();
332 break;
333 #endif
334 #ifdef CONFIG_COLDFIRE
335 case MACH_M54XX:
336 case MACH_M5441X:
337 cf_bootmem_alloc();
338 cf_mmu_context_init();
339 config_BSP(NULL, 0);
340 break;
341 #endif
342 default:
343 panic("No configuration setup");
344 }
345
346 paging_init();
347
348 #ifdef CONFIG_NATFEAT
349 nf_init();
350 #endif
351
352 #ifndef CONFIG_SUN3
353 #ifdef CONFIG_BLK_DEV_INITRD
354 if (m68k_ramdisk.size) {
355 memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);
356 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
357 initrd_end = initrd_start + m68k_ramdisk.size;
358 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
359 }
360 #endif
361
362 #ifdef CONFIG_ATARI
363 if (MACH_IS_ATARI)
364 atari_stram_reserve_pages((void *)availmem);
365 #endif
366 #ifdef CONFIG_SUN3X
367 if (MACH_IS_SUN3X) {
368 dvma_init();
369 }
370 #endif
371
372 #endif /* !CONFIG_SUN3 */
373
374 /* set ISA defs early as possible */
375 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
376 if (MACH_IS_Q40) {
377 isa_type = ISA_TYPE_Q40;
378 isa_sex = 0;
379 }
380 #ifdef CONFIG_AMIGA_PCMCIA
381 if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
382 isa_type = ISA_TYPE_AG;
383 isa_sex = 1;
384 }
385 #endif
386 #ifdef CONFIG_ATARI_ROM_ISA
387 if (MACH_IS_ATARI) {
388 isa_type = ISA_TYPE_ENEC;
389 isa_sex = 0;
390 }
391 #endif
392 #endif
393 }
394
show_cpuinfo(struct seq_file * m,void * v)395 static int show_cpuinfo(struct seq_file *m, void *v)
396 {
397 const char *cpu, *mmu, *fpu;
398 unsigned long clockfreq, clockfactor;
399
400 #define LOOP_CYCLES_68020 (8)
401 #define LOOP_CYCLES_68030 (8)
402 #define LOOP_CYCLES_68040 (3)
403 #define LOOP_CYCLES_68060 (1)
404 #define LOOP_CYCLES_COLDFIRE (2)
405
406 if (CPU_IS_020) {
407 cpu = "68020";
408 clockfactor = LOOP_CYCLES_68020;
409 } else if (CPU_IS_030) {
410 cpu = "68030";
411 clockfactor = LOOP_CYCLES_68030;
412 } else if (CPU_IS_040) {
413 cpu = "68040";
414 clockfactor = LOOP_CYCLES_68040;
415 } else if (CPU_IS_060) {
416 cpu = "68060";
417 clockfactor = LOOP_CYCLES_68060;
418 } else if (CPU_IS_COLDFIRE) {
419 cpu = "ColdFire";
420 clockfactor = LOOP_CYCLES_COLDFIRE;
421 } else {
422 cpu = "680x0";
423 clockfactor = 0;
424 }
425
426 #ifdef CONFIG_M68KFPU_EMU_ONLY
427 fpu = "none(soft float)";
428 #else
429 if (m68k_fputype & FPU_68881)
430 fpu = "68881";
431 else if (m68k_fputype & FPU_68882)
432 fpu = "68882";
433 else if (m68k_fputype & FPU_68040)
434 fpu = "68040";
435 else if (m68k_fputype & FPU_68060)
436 fpu = "68060";
437 else if (m68k_fputype & FPU_SUNFPA)
438 fpu = "Sun FPA";
439 else if (m68k_fputype & FPU_COLDFIRE)
440 fpu = "ColdFire";
441 else
442 fpu = "none";
443 #endif
444
445 if (m68k_mmutype & MMU_68851)
446 mmu = "68851";
447 else if (m68k_mmutype & MMU_68030)
448 mmu = "68030";
449 else if (m68k_mmutype & MMU_68040)
450 mmu = "68040";
451 else if (m68k_mmutype & MMU_68060)
452 mmu = "68060";
453 else if (m68k_mmutype & MMU_SUN3)
454 mmu = "Sun-3";
455 else if (m68k_mmutype & MMU_APOLLO)
456 mmu = "Apollo";
457 else if (m68k_mmutype & MMU_COLDFIRE)
458 mmu = "ColdFire";
459 else
460 mmu = "unknown";
461
462 clockfreq = loops_per_jiffy * HZ * clockfactor;
463
464 seq_printf(m, "CPU:\t\t%s\n"
465 "MMU:\t\t%s\n"
466 "FPU:\t\t%s\n"
467 "Clocking:\t%lu.%1luMHz\n"
468 "BogoMips:\t%lu.%02lu\n"
469 "Calibration:\t%lu loops\n",
470 cpu, mmu, fpu,
471 clockfreq/1000000,(clockfreq/100000)%10,
472 loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
473 loops_per_jiffy);
474 return 0;
475 }
476
c_start(struct seq_file * m,loff_t * pos)477 static void *c_start(struct seq_file *m, loff_t *pos)
478 {
479 return *pos < 1 ? (void *)1 : NULL;
480 }
c_next(struct seq_file * m,void * v,loff_t * pos)481 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
482 {
483 ++*pos;
484 return NULL;
485 }
c_stop(struct seq_file * m,void * v)486 static void c_stop(struct seq_file *m, void *v)
487 {
488 }
489 const struct seq_operations cpuinfo_op = {
490 .start = c_start,
491 .next = c_next,
492 .stop = c_stop,
493 .show = show_cpuinfo,
494 };
495
496 #ifdef CONFIG_PROC_HARDWARE
hardware_proc_show(struct seq_file * m,void * v)497 static int hardware_proc_show(struct seq_file *m, void *v)
498 {
499 char model[80];
500 unsigned long mem;
501 int i;
502
503 if (mach_get_model)
504 mach_get_model(model);
505 else
506 strcpy(model, "Unknown m68k");
507
508 seq_printf(m, "Model:\t\t%s\n", model);
509 for (mem = 0, i = 0; i < m68k_num_memory; i++)
510 mem += m68k_memory[i].size;
511 seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
512
513 if (mach_get_hardware_list)
514 mach_get_hardware_list(m);
515
516 return 0;
517 }
518
proc_hardware_init(void)519 static int __init proc_hardware_init(void)
520 {
521 proc_create_single("hardware", 0, NULL, hardware_proc_show);
522 return 0;
523 }
524 module_init(proc_hardware_init);
525 #endif
526
arch_cpu_finalize_init(void)527 void __init arch_cpu_finalize_init(void)
528 {
529 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
530 if (m68k_fputype == 0) {
531 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
532 "WHICH IS REQUIRED BY LINUX/M68K ***\n");
533 pr_emerg("Upgrade your hardware or join the FPU "
534 "emulation project\n");
535 panic("no FPU");
536 }
537 #endif /* !CONFIG_M68KFPU_EMU */
538 }
539
540 #ifdef CONFIG_ADB
adb_probe_sync_enable(char * str)541 static int __init adb_probe_sync_enable (char *str) {
542 extern int __adb_probe_sync;
543 __adb_probe_sync = 1;
544 return 1;
545 }
546
547 __setup("adb_sync", adb_probe_sync_enable);
548 #endif /* CONFIG_ADB */
549
550 #if IS_ENABLED(CONFIG_NVRAM)
551 #ifdef CONFIG_MAC
m68k_nvram_read_byte(int addr)552 static unsigned char m68k_nvram_read_byte(int addr)
553 {
554 if (MACH_IS_MAC)
555 return mac_pram_read_byte(addr);
556 return 0xff;
557 }
558
m68k_nvram_write_byte(unsigned char val,int addr)559 static void m68k_nvram_write_byte(unsigned char val, int addr)
560 {
561 if (MACH_IS_MAC)
562 mac_pram_write_byte(val, addr);
563 }
564 #endif /* CONFIG_MAC */
565
566 #ifdef CONFIG_ATARI
m68k_nvram_read(char * buf,size_t count,loff_t * ppos)567 static ssize_t m68k_nvram_read(char *buf, size_t count, loff_t *ppos)
568 {
569 if (MACH_IS_ATARI)
570 return atari_nvram_read(buf, count, ppos);
571 else if (MACH_IS_MAC)
572 return nvram_read_bytes(buf, count, ppos);
573 return -EINVAL;
574 }
575
m68k_nvram_write(char * buf,size_t count,loff_t * ppos)576 static ssize_t m68k_nvram_write(char *buf, size_t count, loff_t *ppos)
577 {
578 if (MACH_IS_ATARI)
579 return atari_nvram_write(buf, count, ppos);
580 else if (MACH_IS_MAC)
581 return nvram_write_bytes(buf, count, ppos);
582 return -EINVAL;
583 }
584
m68k_nvram_set_checksum(void)585 static long m68k_nvram_set_checksum(void)
586 {
587 if (MACH_IS_ATARI)
588 return atari_nvram_set_checksum();
589 return -EINVAL;
590 }
591
m68k_nvram_initialize(void)592 static long m68k_nvram_initialize(void)
593 {
594 if (MACH_IS_ATARI)
595 return atari_nvram_initialize();
596 return -EINVAL;
597 }
598 #endif /* CONFIG_ATARI */
599
m68k_nvram_get_size(void)600 static ssize_t m68k_nvram_get_size(void)
601 {
602 if (MACH_IS_ATARI)
603 return atari_nvram_get_size();
604 else if (MACH_IS_MAC)
605 return mac_pram_get_size();
606 return -ENODEV;
607 }
608
609 /* Atari device drivers call .read (to get checksum validation) whereas
610 * Mac and PowerMac device drivers just use .read_byte.
611 */
612 const struct nvram_ops arch_nvram_ops = {
613 #ifdef CONFIG_MAC
614 .read_byte = m68k_nvram_read_byte,
615 .write_byte = m68k_nvram_write_byte,
616 #endif
617 #ifdef CONFIG_ATARI
618 .read = m68k_nvram_read,
619 .write = m68k_nvram_write,
620 .set_checksum = m68k_nvram_set_checksum,
621 .initialize = m68k_nvram_initialize,
622 #endif
623 .get_size = m68k_nvram_get_size,
624 };
625 EXPORT_SYMBOL(arch_nvram_ops);
626 #endif /* CONFIG_NVRAM */
627