xref: /openbmc/linux/arch/m68k/kernel/setup_mm.c (revision 9ceecc25)
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 
58 unsigned long m68k_machtype;
59 EXPORT_SYMBOL(m68k_machtype);
60 unsigned long m68k_cputype;
61 EXPORT_SYMBOL(m68k_cputype);
62 unsigned long m68k_fputype;
63 unsigned long m68k_mmutype;
64 EXPORT_SYMBOL(m68k_mmutype);
65 #ifdef CONFIG_VME
66 unsigned long vme_brdtype;
67 EXPORT_SYMBOL(vme_brdtype);
68 #endif
69 
70 int m68k_is040or060;
71 EXPORT_SYMBOL(m68k_is040or060);
72 
73 extern unsigned long availmem;
74 
75 int m68k_num_memory;
76 EXPORT_SYMBOL(m68k_num_memory);
77 int m68k_realnum_memory;
78 EXPORT_SYMBOL(m68k_realnum_memory);
79 unsigned long m68k_memoffset;
80 struct m68k_mem_info m68k_memory[NUM_MEMINFO];
81 EXPORT_SYMBOL(m68k_memory);
82 
83 static struct m68k_mem_info m68k_ramdisk __initdata;
84 
85 static char m68k_command_line[CL_SIZE] __initdata;
86 
87 void (*mach_sched_init) (void) __initdata = NULL;
88 /* machine dependent irq functions */
89 void (*mach_init_IRQ) (void) __initdata = NULL;
90 void (*mach_get_model) (char *model);
91 void (*mach_get_hardware_list) (struct seq_file *m);
92 void (*mach_reset)( void );
93 void (*mach_halt)( void );
94 #ifdef CONFIG_HEARTBEAT
95 void (*mach_heartbeat) (int);
96 EXPORT_SYMBOL(mach_heartbeat);
97 #endif
98 #ifdef CONFIG_M68K_L2_CACHE
99 void (*mach_l2_flush) (int);
100 #endif
101 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
102 int isa_type;
103 int isa_sex;
104 EXPORT_SYMBOL(isa_type);
105 EXPORT_SYMBOL(isa_sex);
106 #endif
107 
108 #define MASK_256K 0xfffc0000
109 
110 extern void paging_init(void);
111 
m68k_parse_bootinfo(const struct bi_record * record)112 static void __init m68k_parse_bootinfo(const struct bi_record *record)
113 {
114 	const struct bi_record *first_record = record;
115 	uint16_t tag;
116 
117 	while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
118 		int unknown = 0;
119 		const void *data = record->data;
120 		uint16_t size = be16_to_cpu(record->size);
121 
122 		switch (tag) {
123 		case BI_MACHTYPE:
124 		case BI_CPUTYPE:
125 		case BI_FPUTYPE:
126 		case BI_MMUTYPE:
127 			/* Already set up by head.S */
128 			break;
129 
130 		case BI_MEMCHUNK:
131 			if (m68k_num_memory < NUM_MEMINFO) {
132 				const struct mem_info *m = data;
133 				m68k_memory[m68k_num_memory].addr =
134 					be32_to_cpu(m->addr);
135 				m68k_memory[m68k_num_memory].size =
136 					be32_to_cpu(m->size);
137 				m68k_num_memory++;
138 			} else
139 				pr_warn("%s: too many memory chunks\n",
140 					__func__);
141 			break;
142 
143 		case BI_RAMDISK:
144 			{
145 				const struct mem_info *m = data;
146 				m68k_ramdisk.addr = be32_to_cpu(m->addr);
147 				m68k_ramdisk.size = be32_to_cpu(m->size);
148 			}
149 			break;
150 
151 		case BI_COMMAND_LINE:
152 			strscpy(m68k_command_line, data,
153 				sizeof(m68k_command_line));
154 			break;
155 
156 		case BI_RNG_SEED: {
157 			u16 len = be16_to_cpup(data);
158 			add_bootloader_randomness(data + 2, len);
159 			/*
160 			 * Zero the data to preserve forward secrecy, and zero the
161 			 * length to prevent kexec from using it.
162 			 */
163 			memzero_explicit((void *)data, len + 2);
164 			break;
165 		}
166 
167 		default:
168 			if (MACH_IS_AMIGA)
169 				unknown = amiga_parse_bootinfo(record);
170 			else if (MACH_IS_ATARI)
171 				unknown = atari_parse_bootinfo(record);
172 			else if (MACH_IS_MAC)
173 				unknown = mac_parse_bootinfo(record);
174 			else if (MACH_IS_Q40)
175 				unknown = q40_parse_bootinfo(record);
176 			else if (MACH_IS_BVME6000)
177 				unknown = bvme6000_parse_bootinfo(record);
178 			else if (MACH_IS_MVME16x)
179 				unknown = mvme16x_parse_bootinfo(record);
180 			else if (MACH_IS_MVME147)
181 				unknown = mvme147_parse_bootinfo(record);
182 			else if (MACH_IS_HP300)
183 				unknown = hp300_parse_bootinfo(record);
184 			else if (MACH_IS_APOLLO)
185 				unknown = apollo_parse_bootinfo(record);
186 			else if (MACH_IS_VIRT)
187 				unknown = virt_parse_bootinfo(record);
188 			else
189 				unknown = 1;
190 		}
191 		if (unknown)
192 			pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
193 				tag);
194 		record = (struct bi_record *)((unsigned long)record + size);
195 	}
196 
197 	save_bootinfo(first_record);
198 
199 	m68k_realnum_memory = m68k_num_memory;
200 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
201 	if (m68k_num_memory > 1) {
202 		pr_warn("%s: ignoring last %i chunks of physical memory\n",
203 			__func__, (m68k_num_memory - 1));
204 		m68k_num_memory = 1;
205 	}
206 #endif
207 }
208 
setup_arch(char ** cmdline_p)209 void __init setup_arch(char **cmdline_p)
210 {
211 	/* The bootinfo is located right after the kernel */
212 	if (!CPU_IS_COLDFIRE)
213 		m68k_parse_bootinfo((const struct bi_record *)_end);
214 
215 	if (CPU_IS_040)
216 		m68k_is040or060 = 4;
217 	else if (CPU_IS_060)
218 		m68k_is040or060 = 6;
219 
220 	/* FIXME: m68k_fputype is passed in by Penguin booter, which can
221 	 * be confused by software FPU emulation. BEWARE.
222 	 * We should really do our own FPU check at startup.
223 	 * [what do we do with buggy 68LC040s? if we have problems
224 	 *  with them, we should add a test to check_bugs() below] */
225 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
226 	/* clear the fpu if we have one */
227 	if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
228 		volatile int zero = 0;
229 		asm volatile ("frestore %0" : : "m" (zero));
230 	}
231 #endif
232 
233 	if (CPU_IS_060) {
234 		u32 pcr;
235 
236 		asm (".chip 68060; movec %%pcr,%0; .chip 68k"
237 		     : "=d" (pcr));
238 		if (((pcr >> 8) & 0xff) <= 5) {
239 			pr_warn("Enabling workaround for errata I14\n");
240 			asm (".chip 68060; movec %0,%%pcr; .chip 68k"
241 			     : : "d" (pcr | 0x20));
242 		}
243 	}
244 
245 	setup_initial_init_mm((void *)PAGE_OFFSET, _etext, _edata, _end);
246 
247 #if defined(CONFIG_BOOTPARAM)
248 	strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
249 	m68k_command_line[CL_SIZE - 1] = 0;
250 #endif /* CONFIG_BOOTPARAM */
251 	process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
252 	*cmdline_p = m68k_command_line;
253 	memcpy(boot_command_line, *cmdline_p, CL_SIZE);
254 
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 
show_cpuinfo(struct seq_file * m,void * v)376 static 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 
c_start(struct seq_file * m,loff_t * pos)458 static void *c_start(struct seq_file *m, loff_t *pos)
459 {
460 	return *pos < 1 ? (void *)1 : NULL;
461 }
c_next(struct seq_file * m,void * v,loff_t * pos)462 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
463 {
464 	++*pos;
465 	return NULL;
466 }
c_stop(struct seq_file * m,void * v)467 static void c_stop(struct seq_file *m, void *v)
468 {
469 }
470 const 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
hardware_proc_show(struct seq_file * m,void * v)478 static 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 		strcpy(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 
proc_hardware_init(void)500 static int __init proc_hardware_init(void)
501 {
502 	proc_create_single("hardware", 0, NULL, hardware_proc_show);
503 	return 0;
504 }
505 module_init(proc_hardware_init);
506 #endif
507 
arch_cpu_finalize_init(void)508 void __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
adb_probe_sync_enable(char * str)522 static 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
m68k_nvram_read_byte(int addr)533 static 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 
m68k_nvram_write_byte(unsigned char val,int addr)540 static 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
m68k_nvram_read(char * buf,size_t count,loff_t * ppos)548 static 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 
m68k_nvram_write(char * buf,size_t count,loff_t * ppos)557 static 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 
m68k_nvram_set_checksum(void)566 static long m68k_nvram_set_checksum(void)
567 {
568 	if (MACH_IS_ATARI)
569 		return atari_nvram_set_checksum();
570 	return -EINVAL;
571 }
572 
m68k_nvram_initialize(void)573 static 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 
m68k_nvram_get_size(void)581 static 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  */
593 const 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 };
606 EXPORT_SYMBOL(arch_nvram_ops);
607 #endif /* CONFIG_NVRAM */
608