xref: /openbmc/linux/arch/m68k/kernel/setup_mm.c (revision 7e6f7d24) 
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 defined(CONFIG_ISA) && defined(MULTI_ISA)
110 int isa_type;
111 int isa_sex;
112 EXPORT_SYMBOL(isa_type);
113 EXPORT_SYMBOL(isa_sex);
114 #endif
115 
116 extern int amiga_parse_bootinfo(const struct bi_record *);
117 extern int atari_parse_bootinfo(const struct bi_record *);
118 extern int mac_parse_bootinfo(const struct bi_record *);
119 extern int q40_parse_bootinfo(const struct bi_record *);
120 extern int bvme6000_parse_bootinfo(const struct bi_record *);
121 extern int mvme16x_parse_bootinfo(const struct bi_record *);
122 extern int mvme147_parse_bootinfo(const struct bi_record *);
123 extern int hp300_parse_bootinfo(const struct bi_record *);
124 extern int apollo_parse_bootinfo(const struct bi_record *);
125 
126 extern void config_amiga(void);
127 extern void config_atari(void);
128 extern void config_mac(void);
129 extern void config_sun3(void);
130 extern void config_apollo(void);
131 extern void config_mvme147(void);
132 extern void config_mvme16x(void);
133 extern void config_bvme6000(void);
134 extern void config_hp300(void);
135 extern void config_q40(void);
136 extern void config_sun3x(void);
137 
138 #define MASK_256K 0xfffc0000
139 
140 extern void paging_init(void);
141 
142 static void __init m68k_parse_bootinfo(const struct bi_record *record)
143 {
144 	uint16_t tag;
145 
146 	save_bootinfo(record);
147 
148 	while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
149 		int unknown = 0;
150 		const void *data = record->data;
151 		uint16_t size = be16_to_cpu(record->size);
152 
153 		switch (tag) {
154 		case BI_MACHTYPE:
155 		case BI_CPUTYPE:
156 		case BI_FPUTYPE:
157 		case BI_MMUTYPE:
158 			/* Already set up by head.S */
159 			break;
160 
161 		case BI_MEMCHUNK:
162 			if (m68k_num_memory < NUM_MEMINFO) {
163 				const struct mem_info *m = data;
164 				m68k_memory[m68k_num_memory].addr =
165 					be32_to_cpu(m->addr);
166 				m68k_memory[m68k_num_memory].size =
167 					be32_to_cpu(m->size);
168 				m68k_num_memory++;
169 			} else
170 				pr_warn("%s: too many memory chunks\n",
171 					__func__);
172 			break;
173 
174 		case BI_RAMDISK:
175 			{
176 				const struct mem_info *m = data;
177 				m68k_ramdisk.addr = be32_to_cpu(m->addr);
178 				m68k_ramdisk.size = be32_to_cpu(m->size);
179 			}
180 			break;
181 
182 		case BI_COMMAND_LINE:
183 			strlcpy(m68k_command_line, data,
184 				sizeof(m68k_command_line));
185 			break;
186 
187 		default:
188 			if (MACH_IS_AMIGA)
189 				unknown = amiga_parse_bootinfo(record);
190 			else if (MACH_IS_ATARI)
191 				unknown = atari_parse_bootinfo(record);
192 			else if (MACH_IS_MAC)
193 				unknown = mac_parse_bootinfo(record);
194 			else if (MACH_IS_Q40)
195 				unknown = q40_parse_bootinfo(record);
196 			else if (MACH_IS_BVME6000)
197 				unknown = bvme6000_parse_bootinfo(record);
198 			else if (MACH_IS_MVME16x)
199 				unknown = mvme16x_parse_bootinfo(record);
200 			else if (MACH_IS_MVME147)
201 				unknown = mvme147_parse_bootinfo(record);
202 			else if (MACH_IS_HP300)
203 				unknown = hp300_parse_bootinfo(record);
204 			else if (MACH_IS_APOLLO)
205 				unknown = apollo_parse_bootinfo(record);
206 			else
207 				unknown = 1;
208 		}
209 		if (unknown)
210 			pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
211 				tag);
212 		record = (struct bi_record *)((unsigned long)record + size);
213 	}
214 
215 	m68k_realnum_memory = m68k_num_memory;
216 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
217 	if (m68k_num_memory > 1) {
218 		pr_warn("%s: ignoring last %i chunks of physical memory\n",
219 			__func__, (m68k_num_memory - 1));
220 		m68k_num_memory = 1;
221 	}
222 #endif
223 }
224 
225 void __init setup_arch(char **cmdline_p)
226 {
227 #ifndef CONFIG_SUN3
228 	int i;
229 #endif
230 
231 	/* The bootinfo is located right after the kernel */
232 	if (!CPU_IS_COLDFIRE)
233 		m68k_parse_bootinfo((const struct bi_record *)_end);
234 
235 	if (CPU_IS_040)
236 		m68k_is040or060 = 4;
237 	else if (CPU_IS_060)
238 		m68k_is040or060 = 6;
239 
240 	/* FIXME: m68k_fputype is passed in by Penguin booter, which can
241 	 * be confused by software FPU emulation. BEWARE.
242 	 * We should really do our own FPU check at startup.
243 	 * [what do we do with buggy 68LC040s? if we have problems
244 	 *  with them, we should add a test to check_bugs() below] */
245 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
246 	/* clear the fpu if we have one */
247 	if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
248 		volatile int zero = 0;
249 		asm volatile ("frestore %0" : : "m" (zero));
250 	}
251 #endif
252 
253 	if (CPU_IS_060) {
254 		u32 pcr;
255 
256 		asm (".chip 68060; movec %%pcr,%0; .chip 68k"
257 		     : "=d" (pcr));
258 		if (((pcr >> 8) & 0xff) <= 5) {
259 			pr_warn("Enabling workaround for errata I14\n");
260 			asm (".chip 68060; movec %0,%%pcr; .chip 68k"
261 			     : : "d" (pcr | 0x20));
262 		}
263 	}
264 
265 	init_mm.start_code = PAGE_OFFSET;
266 	init_mm.end_code = (unsigned long)_etext;
267 	init_mm.end_data = (unsigned long)_edata;
268 	init_mm.brk = (unsigned long)_end;
269 
270 #if defined(CONFIG_BOOTPARAM)
271 	strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
272 	m68k_command_line[CL_SIZE - 1] = 0;
273 #endif /* CONFIG_BOOTPARAM */
274 	process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
275 	*cmdline_p = m68k_command_line;
276 	memcpy(boot_command_line, *cmdline_p, CL_SIZE);
277 
278 	parse_early_param();
279 
280 #ifdef CONFIG_DUMMY_CONSOLE
281 	conswitchp = &dummy_con;
282 #endif
283 
284 	switch (m68k_machtype) {
285 #ifdef CONFIG_AMIGA
286 	case MACH_AMIGA:
287 		config_amiga();
288 		break;
289 #endif
290 #ifdef CONFIG_ATARI
291 	case MACH_ATARI:
292 		config_atari();
293 		break;
294 #endif
295 #ifdef CONFIG_MAC
296 	case MACH_MAC:
297 		config_mac();
298 		break;
299 #endif
300 #ifdef CONFIG_SUN3
301 	case MACH_SUN3:
302 		config_sun3();
303 		break;
304 #endif
305 #ifdef CONFIG_APOLLO
306 	case MACH_APOLLO:
307 		config_apollo();
308 		break;
309 #endif
310 #ifdef CONFIG_MVME147
311 	case MACH_MVME147:
312 		config_mvme147();
313 		break;
314 #endif
315 #ifdef CONFIG_MVME16x
316 	case MACH_MVME16x:
317 		config_mvme16x();
318 		break;
319 #endif
320 #ifdef CONFIG_BVME6000
321 	case MACH_BVME6000:
322 		config_bvme6000();
323 		break;
324 #endif
325 #ifdef CONFIG_HP300
326 	case MACH_HP300:
327 		config_hp300();
328 		break;
329 #endif
330 #ifdef CONFIG_Q40
331 	case MACH_Q40:
332 		config_q40();
333 		break;
334 #endif
335 #ifdef CONFIG_SUN3X
336 	case MACH_SUN3X:
337 		config_sun3x();
338 		break;
339 #endif
340 #ifdef CONFIG_COLDFIRE
341 	case MACH_M54XX:
342 	case MACH_M5441X:
343 		cf_bootmem_alloc();
344 		cf_mmu_context_init();
345 		config_BSP(NULL, 0);
346 		break;
347 #endif
348 	default:
349 		panic("No configuration setup");
350 	}
351 
352 	paging_init();
353 
354 #ifdef CONFIG_NATFEAT
355 	nf_init();
356 #endif
357 
358 #ifndef CONFIG_SUN3
359 	for (i = 1; i < m68k_num_memory; i++)
360 		free_bootmem_node(NODE_DATA(i), m68k_memory[i].addr,
361 				  m68k_memory[i].size);
362 #ifdef CONFIG_BLK_DEV_INITRD
363 	if (m68k_ramdisk.size) {
364 		reserve_bootmem_node(__virt_to_node(phys_to_virt(m68k_ramdisk.addr)),
365 				     m68k_ramdisk.addr, m68k_ramdisk.size,
366 				     BOOTMEM_DEFAULT);
367 		initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
368 		initrd_end = initrd_start + m68k_ramdisk.size;
369 		pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
370 	}
371 #endif
372 
373 #ifdef CONFIG_ATARI
374 	if (MACH_IS_ATARI)
375 		atari_stram_reserve_pages((void *)availmem);
376 #endif
377 #ifdef CONFIG_SUN3X
378 	if (MACH_IS_SUN3X) {
379 		dvma_init();
380 	}
381 #endif
382 
383 #endif /* !CONFIG_SUN3 */
384 
385 /* set ISA defs early as possible */
386 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
387 	if (MACH_IS_Q40) {
388 		isa_type = ISA_TYPE_Q40;
389 		isa_sex = 0;
390 	}
391 #ifdef CONFIG_AMIGA_PCMCIA
392 	if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
393 		isa_type = ISA_TYPE_AG;
394 		isa_sex = 1;
395 	}
396 #endif
397 #ifdef CONFIG_ATARI_ROM_ISA
398 	if (MACH_IS_ATARI) {
399 		isa_type = ISA_TYPE_ENEC;
400 		isa_sex = 0;
401 	}
402 #endif
403 #endif
404 }
405 
406 static int show_cpuinfo(struct seq_file *m, void *v)
407 {
408 	const char *cpu, *mmu, *fpu;
409 	unsigned long clockfreq, clockfactor;
410 
411 #define LOOP_CYCLES_68020	(8)
412 #define LOOP_CYCLES_68030	(8)
413 #define LOOP_CYCLES_68040	(3)
414 #define LOOP_CYCLES_68060	(1)
415 #define LOOP_CYCLES_COLDFIRE	(2)
416 
417 	if (CPU_IS_020) {
418 		cpu = "68020";
419 		clockfactor = LOOP_CYCLES_68020;
420 	} else if (CPU_IS_030) {
421 		cpu = "68030";
422 		clockfactor = LOOP_CYCLES_68030;
423 	} else if (CPU_IS_040) {
424 		cpu = "68040";
425 		clockfactor = LOOP_CYCLES_68040;
426 	} else if (CPU_IS_060) {
427 		cpu = "68060";
428 		clockfactor = LOOP_CYCLES_68060;
429 	} else if (CPU_IS_COLDFIRE) {
430 		cpu = "ColdFire";
431 		clockfactor = LOOP_CYCLES_COLDFIRE;
432 	} else {
433 		cpu = "680x0";
434 		clockfactor = 0;
435 	}
436 
437 #ifdef CONFIG_M68KFPU_EMU_ONLY
438 	fpu = "none(soft float)";
439 #else
440 	if (m68k_fputype & FPU_68881)
441 		fpu = "68881";
442 	else if (m68k_fputype & FPU_68882)
443 		fpu = "68882";
444 	else if (m68k_fputype & FPU_68040)
445 		fpu = "68040";
446 	else if (m68k_fputype & FPU_68060)
447 		fpu = "68060";
448 	else if (m68k_fputype & FPU_SUNFPA)
449 		fpu = "Sun FPA";
450 	else if (m68k_fputype & FPU_COLDFIRE)
451 		fpu = "ColdFire";
452 	else
453 		fpu = "none";
454 #endif
455 
456 	if (m68k_mmutype & MMU_68851)
457 		mmu = "68851";
458 	else if (m68k_mmutype & MMU_68030)
459 		mmu = "68030";
460 	else if (m68k_mmutype & MMU_68040)
461 		mmu = "68040";
462 	else if (m68k_mmutype & MMU_68060)
463 		mmu = "68060";
464 	else if (m68k_mmutype & MMU_SUN3)
465 		mmu = "Sun-3";
466 	else if (m68k_mmutype & MMU_APOLLO)
467 		mmu = "Apollo";
468 	else if (m68k_mmutype & MMU_COLDFIRE)
469 		mmu = "ColdFire";
470 	else
471 		mmu = "unknown";
472 
473 	clockfreq = loops_per_jiffy * HZ * clockfactor;
474 
475 	seq_printf(m, "CPU:\t\t%s\n"
476 		   "MMU:\t\t%s\n"
477 		   "FPU:\t\t%s\n"
478 		   "Clocking:\t%lu.%1luMHz\n"
479 		   "BogoMips:\t%lu.%02lu\n"
480 		   "Calibration:\t%lu loops\n",
481 		   cpu, mmu, fpu,
482 		   clockfreq/1000000,(clockfreq/100000)%10,
483 		   loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
484 		   loops_per_jiffy);
485 	return 0;
486 }
487 
488 static void *c_start(struct seq_file *m, loff_t *pos)
489 {
490 	return *pos < 1 ? (void *)1 : NULL;
491 }
492 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
493 {
494 	++*pos;
495 	return NULL;
496 }
497 static void c_stop(struct seq_file *m, void *v)
498 {
499 }
500 const struct seq_operations cpuinfo_op = {
501 	.start	= c_start,
502 	.next	= c_next,
503 	.stop	= c_stop,
504 	.show	= show_cpuinfo,
505 };
506 
507 #ifdef CONFIG_PROC_HARDWARE
508 static int hardware_proc_show(struct seq_file *m, void *v)
509 {
510 	char model[80];
511 	unsigned long mem;
512 	int i;
513 
514 	if (mach_get_model)
515 		mach_get_model(model);
516 	else
517 		strcpy(model, "Unknown m68k");
518 
519 	seq_printf(m, "Model:\t\t%s\n", model);
520 	for (mem = 0, i = 0; i < m68k_num_memory; i++)
521 		mem += m68k_memory[i].size;
522 	seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
523 
524 	if (mach_get_hardware_list)
525 		mach_get_hardware_list(m);
526 
527 	return 0;
528 }
529 
530 static int __init proc_hardware_init(void)
531 {
532 	proc_create_single("hardware", 0, NULL, hardware_proc_show);
533 	return 0;
534 }
535 module_init(proc_hardware_init);
536 #endif
537 
538 void check_bugs(void)
539 {
540 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
541 	if (m68k_fputype == 0) {
542 		pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
543 			"WHICH IS REQUIRED BY LINUX/M68K ***\n");
544 		pr_emerg("Upgrade your hardware or join the FPU "
545 			"emulation project\n");
546 		panic("no FPU");
547 	}
548 #endif /* !CONFIG_M68KFPU_EMU */
549 }
550 
551 #ifdef CONFIG_ADB
552 static int __init adb_probe_sync_enable (char *str) {
553 	extern int __adb_probe_sync;
554 	__adb_probe_sync = 1;
555 	return 1;
556 }
557 
558 __setup("adb_sync", adb_probe_sync_enable);
559 #endif /* CONFIG_ADB */
560