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/bootmem.h>
24 #include <linux/proc_fs.h>
25 #include <linux/seq_file.h>
26 #include <linux/module.h>
27 #include <linux/initrd.h>
28
29 #include <asm/bootinfo.h>
30 #include <asm/byteorder.h>
31 #include <asm/sections.h>
32 #include <asm/setup.h>
33 #include <asm/fpu.h>
34 #include <asm/irq.h>
35 #include <asm/io.h>
36 #include <asm/machdep.h>
37 #ifdef CONFIG_AMIGA
38 #include <asm/amigahw.h>
39 #endif
40 #ifdef CONFIG_ATARI
41 #include <asm/atarihw.h>
42 #include <asm/atari_stram.h>
43 #endif
44 #ifdef CONFIG_SUN3X
45 #include <asm/dvma.h>
46 #endif
47 #include <asm/natfeat.h>
48
49 #if !FPSTATESIZE || !NR_IRQS
50 #warning No CPU/platform type selected, your kernel will not work!
51 #warning Are you building an allnoconfig kernel?
52 #endif
53
54 unsigned long m68k_machtype;
55 EXPORT_SYMBOL(m68k_machtype);
56 unsigned long m68k_cputype;
57 EXPORT_SYMBOL(m68k_cputype);
58 unsigned long m68k_fputype;
59 unsigned long m68k_mmutype;
60 EXPORT_SYMBOL(m68k_mmutype);
61 #ifdef CONFIG_VME
62 unsigned long vme_brdtype;
63 EXPORT_SYMBOL(vme_brdtype);
64 #endif
65
66 int m68k_is040or060;
67 EXPORT_SYMBOL(m68k_is040or060);
68
69 extern unsigned long availmem;
70
71 int m68k_num_memory;
72 EXPORT_SYMBOL(m68k_num_memory);
73 int m68k_realnum_memory;
74 EXPORT_SYMBOL(m68k_realnum_memory);
75 unsigned long m68k_memoffset;
76 struct m68k_mem_info m68k_memory[NUM_MEMINFO];
77 EXPORT_SYMBOL(m68k_memory);
78
79 static struct m68k_mem_info m68k_ramdisk __initdata;
80
81 static char m68k_command_line[CL_SIZE] __initdata;
82
83 void (*mach_sched_init) (irq_handler_t handler) __initdata = NULL;
84 /* machine dependent irq functions */
85 void (*mach_init_IRQ) (void) __initdata = NULL;
86 void (*mach_get_model) (char *model);
87 void (*mach_get_hardware_list) (struct seq_file *m);
88 /* machine dependent timer functions */
89 int (*mach_hwclk) (int, struct rtc_time*);
90 EXPORT_SYMBOL(mach_hwclk);
91 int (*mach_set_clock_mmss) (unsigned long);
92 unsigned int (*mach_get_ss)(void);
93 int (*mach_get_rtc_pll)(struct rtc_pll_info *);
94 int (*mach_set_rtc_pll)(struct rtc_pll_info *);
95 EXPORT_SYMBOL(mach_get_ss);
96 EXPORT_SYMBOL(mach_get_rtc_pll);
97 EXPORT_SYMBOL(mach_set_rtc_pll);
98 void (*mach_reset)( void );
99 void (*mach_halt)( void );
100 void (*mach_power_off)( void );
101 long mach_max_dma_address = 0x00ffffff; /* default set to the lower 16MB */
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 IS_ENABLED(CONFIG_INPUT_M68K_BEEP)
110 void (*mach_beep)(unsigned int, unsigned int);
111 EXPORT_SYMBOL(mach_beep);
112 #endif
113 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
114 int isa_type;
115 int isa_sex;
116 EXPORT_SYMBOL(isa_type);
117 EXPORT_SYMBOL(isa_sex);
118 #endif
119
120 extern int amiga_parse_bootinfo(const struct bi_record *);
121 extern int atari_parse_bootinfo(const struct bi_record *);
122 extern int mac_parse_bootinfo(const struct bi_record *);
123 extern int q40_parse_bootinfo(const struct bi_record *);
124 extern int bvme6000_parse_bootinfo(const struct bi_record *);
125 extern int mvme16x_parse_bootinfo(const struct bi_record *);
126 extern int mvme147_parse_bootinfo(const struct bi_record *);
127 extern int hp300_parse_bootinfo(const struct bi_record *);
128 extern int apollo_parse_bootinfo(const struct bi_record *);
129
130 extern void config_amiga(void);
131 extern void config_atari(void);
132 extern void config_mac(void);
133 extern void config_sun3(void);
134 extern void config_apollo(void);
135 extern void config_mvme147(void);
136 extern void config_mvme16x(void);
137 extern void config_bvme6000(void);
138 extern void config_hp300(void);
139 extern void config_q40(void);
140 extern void config_sun3x(void);
141
142 #define MASK_256K 0xfffc0000
143
144 extern void paging_init(void);
145
m68k_parse_bootinfo(const struct bi_record * record)146 static void __init m68k_parse_bootinfo(const struct bi_record *record)
147 {
148 uint16_t tag;
149
150 save_bootinfo(record);
151
152 while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
153 int unknown = 0;
154 const void *data = record->data;
155 uint16_t size = be16_to_cpu(record->size);
156
157 switch (tag) {
158 case BI_MACHTYPE:
159 case BI_CPUTYPE:
160 case BI_FPUTYPE:
161 case BI_MMUTYPE:
162 /* Already set up by head.S */
163 break;
164
165 case BI_MEMCHUNK:
166 if (m68k_num_memory < NUM_MEMINFO) {
167 const struct mem_info *m = data;
168 m68k_memory[m68k_num_memory].addr =
169 be32_to_cpu(m->addr);
170 m68k_memory[m68k_num_memory].size =
171 be32_to_cpu(m->size);
172 m68k_num_memory++;
173 } else
174 pr_warn("%s: too many memory chunks\n",
175 __func__);
176 break;
177
178 case BI_RAMDISK:
179 {
180 const struct mem_info *m = data;
181 m68k_ramdisk.addr = be32_to_cpu(m->addr);
182 m68k_ramdisk.size = be32_to_cpu(m->size);
183 }
184 break;
185
186 case BI_COMMAND_LINE:
187 strlcpy(m68k_command_line, data,
188 sizeof(m68k_command_line));
189 break;
190
191 default:
192 if (MACH_IS_AMIGA)
193 unknown = amiga_parse_bootinfo(record);
194 else if (MACH_IS_ATARI)
195 unknown = atari_parse_bootinfo(record);
196 else if (MACH_IS_MAC)
197 unknown = mac_parse_bootinfo(record);
198 else if (MACH_IS_Q40)
199 unknown = q40_parse_bootinfo(record);
200 else if (MACH_IS_BVME6000)
201 unknown = bvme6000_parse_bootinfo(record);
202 else if (MACH_IS_MVME16x)
203 unknown = mvme16x_parse_bootinfo(record);
204 else if (MACH_IS_MVME147)
205 unknown = mvme147_parse_bootinfo(record);
206 else if (MACH_IS_HP300)
207 unknown = hp300_parse_bootinfo(record);
208 else if (MACH_IS_APOLLO)
209 unknown = apollo_parse_bootinfo(record);
210 else
211 unknown = 1;
212 }
213 if (unknown)
214 pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
215 tag);
216 record = (struct bi_record *)((unsigned long)record + size);
217 }
218
219 m68k_realnum_memory = m68k_num_memory;
220 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
221 if (m68k_num_memory > 1) {
222 pr_warn("%s: ignoring last %i chunks of physical memory\n",
223 __func__, (m68k_num_memory - 1));
224 m68k_num_memory = 1;
225 }
226 #endif
227 }
228
setup_arch(char ** cmdline_p)229 void __init setup_arch(char **cmdline_p)
230 {
231 #ifndef CONFIG_SUN3
232 int i;
233 #endif
234
235 /* The bootinfo is located right after the kernel */
236 if (!CPU_IS_COLDFIRE)
237 m68k_parse_bootinfo((const struct bi_record *)_end);
238
239 if (CPU_IS_040)
240 m68k_is040or060 = 4;
241 else if (CPU_IS_060)
242 m68k_is040or060 = 6;
243
244 /* FIXME: m68k_fputype is passed in by Penguin booter, which can
245 * be confused by software FPU emulation. BEWARE.
246 * We should really do our own FPU check at startup.
247 * [what do we do with buggy 68LC040s? if we have problems
248 * with them, we should add a test to check_bugs() below] */
249 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
250 /* clear the fpu if we have one */
251 if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
252 volatile int zero = 0;
253 asm volatile ("frestore %0" : : "m" (zero));
254 }
255 #endif
256
257 if (CPU_IS_060) {
258 u32 pcr;
259
260 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
261 : "=d" (pcr));
262 if (((pcr >> 8) & 0xff) <= 5) {
263 pr_warn("Enabling workaround for errata I14\n");
264 asm (".chip 68060; movec %0,%%pcr; .chip 68k"
265 : : "d" (pcr | 0x20));
266 }
267 }
268
269 init_mm.start_code = PAGE_OFFSET;
270 init_mm.end_code = (unsigned long)_etext;
271 init_mm.end_data = (unsigned long)_edata;
272 init_mm.brk = (unsigned long)_end;
273
274 #if defined(CONFIG_BOOTPARAM)
275 strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
276 m68k_command_line[CL_SIZE - 1] = 0;
277 #endif /* CONFIG_BOOTPARAM */
278 process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
279 *cmdline_p = m68k_command_line;
280 memcpy(boot_command_line, *cmdline_p, CL_SIZE);
281
282 parse_early_param();
283
284 #ifdef CONFIG_DUMMY_CONSOLE
285 conswitchp = &dummy_con;
286 #endif
287
288 switch (m68k_machtype) {
289 #ifdef CONFIG_AMIGA
290 case MACH_AMIGA:
291 config_amiga();
292 break;
293 #endif
294 #ifdef CONFIG_ATARI
295 case MACH_ATARI:
296 config_atari();
297 break;
298 #endif
299 #ifdef CONFIG_MAC
300 case MACH_MAC:
301 config_mac();
302 break;
303 #endif
304 #ifdef CONFIG_SUN3
305 case MACH_SUN3:
306 config_sun3();
307 break;
308 #endif
309 #ifdef CONFIG_APOLLO
310 case MACH_APOLLO:
311 config_apollo();
312 break;
313 #endif
314 #ifdef CONFIG_MVME147
315 case MACH_MVME147:
316 config_mvme147();
317 break;
318 #endif
319 #ifdef CONFIG_MVME16x
320 case MACH_MVME16x:
321 config_mvme16x();
322 break;
323 #endif
324 #ifdef CONFIG_BVME6000
325 case MACH_BVME6000:
326 config_bvme6000();
327 break;
328 #endif
329 #ifdef CONFIG_HP300
330 case MACH_HP300:
331 config_hp300();
332 break;
333 #endif
334 #ifdef CONFIG_Q40
335 case MACH_Q40:
336 config_q40();
337 break;
338 #endif
339 #ifdef CONFIG_SUN3X
340 case MACH_SUN3X:
341 config_sun3x();
342 break;
343 #endif
344 #ifdef CONFIG_COLDFIRE
345 case MACH_M54XX:
346 case MACH_M5441X:
347 config_BSP(NULL, 0);
348 break;
349 #endif
350 default:
351 panic("No configuration setup");
352 }
353
354 paging_init();
355
356 #ifdef CONFIG_NATFEAT
357 nf_init();
358 #endif
359
360 #ifndef CONFIG_SUN3
361 for (i = 1; i < m68k_num_memory; i++)
362 free_bootmem_node(NODE_DATA(i), m68k_memory[i].addr,
363 m68k_memory[i].size);
364 #ifdef CONFIG_BLK_DEV_INITRD
365 if (m68k_ramdisk.size) {
366 reserve_bootmem_node(__virt_to_node(phys_to_virt(m68k_ramdisk.addr)),
367 m68k_ramdisk.addr, m68k_ramdisk.size,
368 BOOTMEM_DEFAULT);
369 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
370 initrd_end = initrd_start + m68k_ramdisk.size;
371 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
372 }
373 #endif
374
375 #ifdef CONFIG_ATARI
376 if (MACH_IS_ATARI)
377 atari_stram_reserve_pages((void *)availmem);
378 #endif
379 #ifdef CONFIG_SUN3X
380 if (MACH_IS_SUN3X) {
381 dvma_init();
382 }
383 #endif
384
385 #endif /* !CONFIG_SUN3 */
386
387 /* set ISA defs early as possible */
388 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
389 if (MACH_IS_Q40) {
390 isa_type = ISA_TYPE_Q40;
391 isa_sex = 0;
392 }
393 #ifdef CONFIG_AMIGA_PCMCIA
394 if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
395 isa_type = ISA_TYPE_AG;
396 isa_sex = 1;
397 }
398 #endif
399 #ifdef CONFIG_ATARI_ROM_ISA
400 if (MACH_IS_ATARI) {
401 isa_type = ISA_TYPE_ENEC;
402 isa_sex = 0;
403 }
404 #endif
405 #endif
406 }
407
show_cpuinfo(struct seq_file * m,void * v)408 static int show_cpuinfo(struct seq_file *m, void *v)
409 {
410 const char *cpu, *mmu, *fpu;
411 unsigned long clockfreq, clockfactor;
412
413 #define LOOP_CYCLES_68020 (8)
414 #define LOOP_CYCLES_68030 (8)
415 #define LOOP_CYCLES_68040 (3)
416 #define LOOP_CYCLES_68060 (1)
417 #define LOOP_CYCLES_COLDFIRE (2)
418
419 if (CPU_IS_020) {
420 cpu = "68020";
421 clockfactor = LOOP_CYCLES_68020;
422 } else if (CPU_IS_030) {
423 cpu = "68030";
424 clockfactor = LOOP_CYCLES_68030;
425 } else if (CPU_IS_040) {
426 cpu = "68040";
427 clockfactor = LOOP_CYCLES_68040;
428 } else if (CPU_IS_060) {
429 cpu = "68060";
430 clockfactor = LOOP_CYCLES_68060;
431 } else if (CPU_IS_COLDFIRE) {
432 cpu = "ColdFire";
433 clockfactor = LOOP_CYCLES_COLDFIRE;
434 } else {
435 cpu = "680x0";
436 clockfactor = 0;
437 }
438
439 #ifdef CONFIG_M68KFPU_EMU_ONLY
440 fpu = "none(soft float)";
441 #else
442 if (m68k_fputype & FPU_68881)
443 fpu = "68881";
444 else if (m68k_fputype & FPU_68882)
445 fpu = "68882";
446 else if (m68k_fputype & FPU_68040)
447 fpu = "68040";
448 else if (m68k_fputype & FPU_68060)
449 fpu = "68060";
450 else if (m68k_fputype & FPU_SUNFPA)
451 fpu = "Sun FPA";
452 else if (m68k_fputype & FPU_COLDFIRE)
453 fpu = "ColdFire";
454 else
455 fpu = "none";
456 #endif
457
458 if (m68k_mmutype & MMU_68851)
459 mmu = "68851";
460 else if (m68k_mmutype & MMU_68030)
461 mmu = "68030";
462 else if (m68k_mmutype & MMU_68040)
463 mmu = "68040";
464 else if (m68k_mmutype & MMU_68060)
465 mmu = "68060";
466 else if (m68k_mmutype & MMU_SUN3)
467 mmu = "Sun-3";
468 else if (m68k_mmutype & MMU_APOLLO)
469 mmu = "Apollo";
470 else if (m68k_mmutype & MMU_COLDFIRE)
471 mmu = "ColdFire";
472 else
473 mmu = "unknown";
474
475 clockfreq = loops_per_jiffy * HZ * clockfactor;
476
477 seq_printf(m, "CPU:\t\t%s\n"
478 "MMU:\t\t%s\n"
479 "FPU:\t\t%s\n"
480 "Clocking:\t%lu.%1luMHz\n"
481 "BogoMips:\t%lu.%02lu\n"
482 "Calibration:\t%lu loops\n",
483 cpu, mmu, fpu,
484 clockfreq/1000000,(clockfreq/100000)%10,
485 loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
486 loops_per_jiffy);
487 return 0;
488 }
489
c_start(struct seq_file * m,loff_t * pos)490 static void *c_start(struct seq_file *m, loff_t *pos)
491 {
492 return *pos < 1 ? (void *)1 : NULL;
493 }
c_next(struct seq_file * m,void * v,loff_t * pos)494 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
495 {
496 ++*pos;
497 return NULL;
498 }
c_stop(struct seq_file * m,void * v)499 static void c_stop(struct seq_file *m, void *v)
500 {
501 }
502 const struct seq_operations cpuinfo_op = {
503 .start = c_start,
504 .next = c_next,
505 .stop = c_stop,
506 .show = show_cpuinfo,
507 };
508
509 #ifdef CONFIG_PROC_HARDWARE
hardware_proc_show(struct seq_file * m,void * v)510 static int hardware_proc_show(struct seq_file *m, void *v)
511 {
512 char model[80];
513 unsigned long mem;
514 int i;
515
516 if (mach_get_model)
517 mach_get_model(model);
518 else
519 strcpy(model, "Unknown m68k");
520
521 seq_printf(m, "Model:\t\t%s\n", model);
522 for (mem = 0, i = 0; i < m68k_num_memory; i++)
523 mem += m68k_memory[i].size;
524 seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
525
526 if (mach_get_hardware_list)
527 mach_get_hardware_list(m);
528
529 return 0;
530 }
531
hardware_proc_open(struct inode * inode,struct file * file)532 static int hardware_proc_open(struct inode *inode, struct file *file)
533 {
534 return single_open(file, hardware_proc_show, NULL);
535 }
536
537 static const struct file_operations hardware_proc_fops = {
538 .open = hardware_proc_open,
539 .read = seq_read,
540 .llseek = seq_lseek,
541 .release = single_release,
542 };
543
proc_hardware_init(void)544 static int __init proc_hardware_init(void)
545 {
546 proc_create("hardware", 0, NULL, &hardware_proc_fops);
547 return 0;
548 }
549 module_init(proc_hardware_init);
550 #endif
551
check_bugs(void)552 void check_bugs(void)
553 {
554 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
555 if (m68k_fputype == 0) {
556 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
557 "WHICH IS REQUIRED BY LINUX/M68K ***\n");
558 pr_emerg("Upgrade your hardware or join the FPU "
559 "emulation project\n");
560 panic("no FPU");
561 }
562 #endif /* !CONFIG_M68KFPU_EMU */
563 }
564
565 #ifdef CONFIG_ADB
adb_probe_sync_enable(char * str)566 static int __init adb_probe_sync_enable (char *str) {
567 extern int __adb_probe_sync;
568 __adb_probe_sync = 1;
569 return 1;
570 }
571
572 __setup("adb_sync", adb_probe_sync_enable);
573 #endif /* CONFIG_ADB */
574