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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
58unsigned long m68k_machtype;
59EXPORT_SYMBOL(m68k_machtype);
60unsigned long m68k_cputype;
61EXPORT_SYMBOL(m68k_cputype);
62unsigned long m68k_fputype;
63unsigned long m68k_mmutype;
64EXPORT_SYMBOL(m68k_mmutype);
65#ifdef CONFIG_VME
66unsigned long vme_brdtype;
67EXPORT_SYMBOL(vme_brdtype);
68#endif
69
70int m68k_is040or060;
71EXPORT_SYMBOL(m68k_is040or060);
72
73extern unsigned long availmem;
74
75int m68k_num_memory;
76EXPORT_SYMBOL(m68k_num_memory);
77int m68k_realnum_memory;
78EXPORT_SYMBOL(m68k_realnum_memory);
79unsigned long m68k_memoffset;
80struct m68k_mem_info m68k_memory[NUM_MEMINFO];
81EXPORT_SYMBOL(m68k_memory);
82
83static struct m68k_mem_info m68k_ramdisk __initdata;
84
85static char m68k_command_line[CL_SIZE] __initdata;
86
87void (*mach_sched_init) (void) __initdata = NULL;
88/* machine dependent irq functions */
89void (*mach_init_IRQ) (void) __initdata = NULL;
90void (*mach_get_model) (char *model);
91void (*mach_get_hardware_list) (struct seq_file *m);
92void (*mach_reset)( void );
93void (*mach_halt)( void );
94#ifdef CONFIG_HEARTBEAT
95void (*mach_heartbeat) (int);
96EXPORT_SYMBOL(mach_heartbeat);
97#endif
98#ifdef CONFIG_M68K_L2_CACHE
99void (*mach_l2_flush) (int);
100#endif
101#if defined(CONFIG_ISA) && defined(MULTI_ISA)
102int isa_type;
103int isa_sex;
104EXPORT_SYMBOL(isa_type);
105EXPORT_SYMBOL(isa_sex);
106#endif
107
108#define MASK_256K 0xfffc0000
109
110static void __init m68k_parse_bootinfo(const struct bi_record *record)
111{
112 const struct bi_record *first_record = record;
113 uint16_t tag;
114
115 while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
116 int unknown = 0;
117 const void *data = record->data;
118 uint16_t size = be16_to_cpu(record->size);
119
120 switch (tag) {
121 case BI_MACHTYPE:
122 case BI_CPUTYPE:
123 case BI_FPUTYPE:
124 case BI_MMUTYPE:
125 /* Already set up by head.S */
126 break;
127
128 case BI_MEMCHUNK:
129 if (m68k_num_memory < NUM_MEMINFO) {
130 const struct mem_info *m = data;
131 m68k_memory[m68k_num_memory].addr =
132 be32_to_cpu(m->addr);
133 m68k_memory[m68k_num_memory].size =
134 be32_to_cpu(m->size);
135 m68k_num_memory++;
136 } else
137 pr_warn("%s: too many memory chunks\n",
138 __func__);
139 break;
140
141 case BI_RAMDISK:
142 {
143 const struct mem_info *m = data;
144 m68k_ramdisk.addr = be32_to_cpu(m->addr);
145 m68k_ramdisk.size = be32_to_cpu(m->size);
146 }
147 break;
148
149 case BI_COMMAND_LINE:
150 strscpy(m68k_command_line, data);
151 break;
152
153 case BI_RNG_SEED: {
154 u16 len = be16_to_cpup(data);
155 add_bootloader_randomness(data + 2, len);
156 /*
157 * Zero the data to preserve forward secrecy, and zero the
158 * length to prevent kexec from using it.
159 */
160 memzero_explicit((void *)data, len + 2);
161 break;
162 }
163
164 default:
165 if (MACH_IS_AMIGA)
166 unknown = amiga_parse_bootinfo(record);
167 else if (MACH_IS_ATARI)
168 unknown = atari_parse_bootinfo(record);
169 else if (MACH_IS_MAC)
170 unknown = mac_parse_bootinfo(record);
171 else if (MACH_IS_Q40)
172 unknown = q40_parse_bootinfo(record);
173 else if (MACH_IS_BVME6000)
174 unknown = bvme6000_parse_bootinfo(record);
175 else if (MACH_IS_MVME16x)
176 unknown = mvme16x_parse_bootinfo(record);
177 else if (MACH_IS_MVME147)
178 unknown = mvme147_parse_bootinfo(record);
179 else if (MACH_IS_HP300)
180 unknown = hp300_parse_bootinfo(record);
181 else if (MACH_IS_APOLLO)
182 unknown = apollo_parse_bootinfo(record);
183 else if (MACH_IS_VIRT)
184 unknown = virt_parse_bootinfo(record);
185 else
186 unknown = 1;
187 }
188 if (unknown)
189 pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
190 tag);
191 record = (struct bi_record *)((unsigned long)record + size);
192 }
193
194 save_bootinfo(first_record);
195
196 m68k_realnum_memory = m68k_num_memory;
197#ifdef CONFIG_SINGLE_MEMORY_CHUNK
198 if (m68k_num_memory > 1) {
199 pr_warn("%s: ignoring last %i chunks of physical memory\n",
200 __func__, (m68k_num_memory - 1));
201 m68k_num_memory = 1;
202 }
203#endif
204}
205
206void __init setup_arch(char **cmdline_p)
207{
208 /* The bootinfo is located right after the kernel */
209 if (!CPU_IS_COLDFIRE)
210 m68k_parse_bootinfo((const struct bi_record *)_end);
211
212 if (CPU_IS_040)
213 m68k_is040or060 = 4;
214 else if (CPU_IS_060)
215 m68k_is040or060 = 6;
216
217 /* FIXME: m68k_fputype is passed in by Penguin booter, which can
218 * be confused by software FPU emulation. BEWARE.
219 * We should really do our own FPU check at startup.
220 * [what do we do with buggy 68LC040s? if we have problems
221 * with them, we should add a test to check_bugs() below] */
222#if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
223 /* clear the fpu if we have one */
224 if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
225 volatile int zero = 0;
226 asm volatile ("frestore %0" : : "m" (zero));
227 }
228#endif
229
230 if (CPU_IS_060) {
231 u32 pcr;
232
233 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
234 : "=d" (pcr));
235 if (((pcr >> 8) & 0xff) <= 5) {
236 pr_warn("Enabling workaround for errata I14\n");
237 asm (".chip 68060; movec %0,%%pcr; .chip 68k"
238 : : "d" (pcr | 0x20));
239 }
240 }
241
242 setup_initial_init_mm((void *)PAGE_OFFSET, _etext, _edata, _end);
243
244#if defined(CONFIG_BOOTPARAM)
245 strscpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
246#endif /* CONFIG_BOOTPARAM */
247 process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
248 *cmdline_p = m68k_command_line;
249 memcpy(boot_command_line, *cmdline_p, CL_SIZE);
250 /*
251 * Initialise the static keys early as they may be enabled by the
252 * cpufeature code and early parameters.
253 */
254 jump_label_init();
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
376static 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
458static void *c_start(struct seq_file *m, loff_t *pos)
459{
460 return *pos < 1 ? (void *)1 : NULL;
461}
462static void *c_next(struct seq_file *m, void *v, loff_t *pos)
463{
464 ++*pos;
465 return NULL;
466}
467static void c_stop(struct seq_file *m, void *v)
468{
469}
470const 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
478static 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 strscpy(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
500static int __init proc_hardware_init(void)
501{
502 proc_create_single("hardware", 0, NULL, hardware_proc_show);
503 return 0;
504}
505module_init(proc_hardware_init);
506#endif
507
508void __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
522static 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
533static 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
540static 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
548static 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
557static 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
566static long m68k_nvram_set_checksum(void)
567{
568 if (MACH_IS_ATARI)
569 return atari_nvram_set_checksum();
570 return -EINVAL;
571}
572
573static 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
581static 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 */
593const 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};
606EXPORT_SYMBOL(arch_nvram_ops);
607#endif /* CONFIG_NVRAM */