Merge tag 'm68k-for-v4.20-tag2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[sfrench/cifs-2.6.git] / arch / m68k / kernel / setup_mm.c
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/memblock.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 unsigned int (*mach_get_ss)(void);
92 int (*mach_get_rtc_pll)(struct rtc_pll_info *);
93 int (*mach_set_rtc_pll)(struct rtc_pll_info *);
94 EXPORT_SYMBOL(mach_get_ss);
95 EXPORT_SYMBOL(mach_get_rtc_pll);
96 EXPORT_SYMBOL(mach_set_rtc_pll);
97 void (*mach_reset)( void );
98 void (*mach_halt)( void );
99 void (*mach_power_off)( void );
100 long mach_max_dma_address = 0x00ffffff; /* default set to the lower 16MB */
101 #ifdef CONFIG_HEARTBEAT
102 void (*mach_heartbeat) (int);
103 EXPORT_SYMBOL(mach_heartbeat);
104 #endif
105 #ifdef CONFIG_M68K_L2_CACHE
106 void (*mach_l2_flush) (int);
107 #endif
108 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
109 int isa_type;
110 int isa_sex;
111 EXPORT_SYMBOL(isa_type);
112 EXPORT_SYMBOL(isa_sex);
113 #endif
114
115 extern int amiga_parse_bootinfo(const struct bi_record *);
116 extern int atari_parse_bootinfo(const struct bi_record *);
117 extern int mac_parse_bootinfo(const struct bi_record *);
118 extern int q40_parse_bootinfo(const struct bi_record *);
119 extern int bvme6000_parse_bootinfo(const struct bi_record *);
120 extern int mvme16x_parse_bootinfo(const struct bi_record *);
121 extern int mvme147_parse_bootinfo(const struct bi_record *);
122 extern int hp300_parse_bootinfo(const struct bi_record *);
123 extern int apollo_parse_bootinfo(const struct bi_record *);
124
125 extern void config_amiga(void);
126 extern void config_atari(void);
127 extern void config_mac(void);
128 extern void config_sun3(void);
129 extern void config_apollo(void);
130 extern void config_mvme147(void);
131 extern void config_mvme16x(void);
132 extern void config_bvme6000(void);
133 extern void config_hp300(void);
134 extern void config_q40(void);
135 extern void config_sun3x(void);
136
137 #define MASK_256K 0xfffc0000
138
139 extern void paging_init(void);
140
141 static void __init m68k_parse_bootinfo(const struct bi_record *record)
142 {
143         uint16_t tag;
144
145         save_bootinfo(record);
146
147         while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
148                 int unknown = 0;
149                 const void *data = record->data;
150                 uint16_t size = be16_to_cpu(record->size);
151
152                 switch (tag) {
153                 case BI_MACHTYPE:
154                 case BI_CPUTYPE:
155                 case BI_FPUTYPE:
156                 case BI_MMUTYPE:
157                         /* Already set up by head.S */
158                         break;
159
160                 case BI_MEMCHUNK:
161                         if (m68k_num_memory < NUM_MEMINFO) {
162                                 const struct mem_info *m = data;
163                                 m68k_memory[m68k_num_memory].addr =
164                                         be32_to_cpu(m->addr);
165                                 m68k_memory[m68k_num_memory].size =
166                                         be32_to_cpu(m->size);
167                                 m68k_num_memory++;
168                         } else
169                                 pr_warn("%s: too many memory chunks\n",
170                                         __func__);
171                         break;
172
173                 case BI_RAMDISK:
174                         {
175                                 const struct mem_info *m = data;
176                                 m68k_ramdisk.addr = be32_to_cpu(m->addr);
177                                 m68k_ramdisk.size = be32_to_cpu(m->size);
178                         }
179                         break;
180
181                 case BI_COMMAND_LINE:
182                         strlcpy(m68k_command_line, data,
183                                 sizeof(m68k_command_line));
184                         break;
185
186                 default:
187                         if (MACH_IS_AMIGA)
188                                 unknown = amiga_parse_bootinfo(record);
189                         else if (MACH_IS_ATARI)
190                                 unknown = atari_parse_bootinfo(record);
191                         else if (MACH_IS_MAC)
192                                 unknown = mac_parse_bootinfo(record);
193                         else if (MACH_IS_Q40)
194                                 unknown = q40_parse_bootinfo(record);
195                         else if (MACH_IS_BVME6000)
196                                 unknown = bvme6000_parse_bootinfo(record);
197                         else if (MACH_IS_MVME16x)
198                                 unknown = mvme16x_parse_bootinfo(record);
199                         else if (MACH_IS_MVME147)
200                                 unknown = mvme147_parse_bootinfo(record);
201                         else if (MACH_IS_HP300)
202                                 unknown = hp300_parse_bootinfo(record);
203                         else if (MACH_IS_APOLLO)
204                                 unknown = apollo_parse_bootinfo(record);
205                         else
206                                 unknown = 1;
207                 }
208                 if (unknown)
209                         pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
210                                 tag);
211                 record = (struct bi_record *)((unsigned long)record + size);
212         }
213
214         m68k_realnum_memory = m68k_num_memory;
215 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
216         if (m68k_num_memory > 1) {
217                 pr_warn("%s: ignoring last %i chunks of physical memory\n",
218                         __func__, (m68k_num_memory - 1));
219                 m68k_num_memory = 1;
220         }
221 #endif
222 }
223
224 void __init setup_arch(char **cmdline_p)
225 {
226         /* The bootinfo is located right after the kernel */
227         if (!CPU_IS_COLDFIRE)
228                 m68k_parse_bootinfo((const struct bi_record *)_end);
229
230         if (CPU_IS_040)
231                 m68k_is040or060 = 4;
232         else if (CPU_IS_060)
233                 m68k_is040or060 = 6;
234
235         /* FIXME: m68k_fputype is passed in by Penguin booter, which can
236          * be confused by software FPU emulation. BEWARE.
237          * We should really do our own FPU check at startup.
238          * [what do we do with buggy 68LC040s? if we have problems
239          *  with them, we should add a test to check_bugs() below] */
240 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
241         /* clear the fpu if we have one */
242         if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
243                 volatile int zero = 0;
244                 asm volatile ("frestore %0" : : "m" (zero));
245         }
246 #endif
247
248         if (CPU_IS_060) {
249                 u32 pcr;
250
251                 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
252                      : "=d" (pcr));
253                 if (((pcr >> 8) & 0xff) <= 5) {
254                         pr_warn("Enabling workaround for errata I14\n");
255                         asm (".chip 68060; movec %0,%%pcr; .chip 68k"
256                              : : "d" (pcr | 0x20));
257                 }
258         }
259
260         init_mm.start_code = PAGE_OFFSET;
261         init_mm.end_code = (unsigned long)_etext;
262         init_mm.end_data = (unsigned long)_edata;
263         init_mm.brk = (unsigned long)_end;
264
265 #if defined(CONFIG_BOOTPARAM)
266         strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
267         m68k_command_line[CL_SIZE - 1] = 0;
268 #endif /* CONFIG_BOOTPARAM */
269         process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
270         *cmdline_p = m68k_command_line;
271         memcpy(boot_command_line, *cmdline_p, CL_SIZE);
272
273         parse_early_param();
274
275 #ifdef CONFIG_DUMMY_CONSOLE
276         conswitchp = &dummy_con;
277 #endif
278
279         switch (m68k_machtype) {
280 #ifdef CONFIG_AMIGA
281         case MACH_AMIGA:
282                 config_amiga();
283                 break;
284 #endif
285 #ifdef CONFIG_ATARI
286         case MACH_ATARI:
287                 config_atari();
288                 break;
289 #endif
290 #ifdef CONFIG_MAC
291         case MACH_MAC:
292                 config_mac();
293                 break;
294 #endif
295 #ifdef CONFIG_SUN3
296         case MACH_SUN3:
297                 config_sun3();
298                 break;
299 #endif
300 #ifdef CONFIG_APOLLO
301         case MACH_APOLLO:
302                 config_apollo();
303                 break;
304 #endif
305 #ifdef CONFIG_MVME147
306         case MACH_MVME147:
307                 config_mvme147();
308                 break;
309 #endif
310 #ifdef CONFIG_MVME16x
311         case MACH_MVME16x:
312                 config_mvme16x();
313                 break;
314 #endif
315 #ifdef CONFIG_BVME6000
316         case MACH_BVME6000:
317                 config_bvme6000();
318                 break;
319 #endif
320 #ifdef CONFIG_HP300
321         case MACH_HP300:
322                 config_hp300();
323                 break;
324 #endif
325 #ifdef CONFIG_Q40
326         case MACH_Q40:
327                 config_q40();
328                 break;
329 #endif
330 #ifdef CONFIG_SUN3X
331         case MACH_SUN3X:
332                 config_sun3x();
333                 break;
334 #endif
335 #ifdef CONFIG_COLDFIRE
336         case MACH_M54XX:
337         case MACH_M5441X:
338                 cf_bootmem_alloc();
339                 cf_mmu_context_init();
340                 config_BSP(NULL, 0);
341                 break;
342 #endif
343         default:
344                 panic("No configuration setup");
345         }
346
347         paging_init();
348
349 #ifdef CONFIG_NATFEAT
350         nf_init();
351 #endif
352
353 #ifndef CONFIG_SUN3
354 #ifdef CONFIG_BLK_DEV_INITRD
355         if (m68k_ramdisk.size) {
356                 memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);
357                 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
358                 initrd_end = initrd_start + m68k_ramdisk.size;
359                 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
360         }
361 #endif
362
363 #ifdef CONFIG_ATARI
364         if (MACH_IS_ATARI)
365                 atari_stram_reserve_pages((void *)availmem);
366 #endif
367 #ifdef CONFIG_SUN3X
368         if (MACH_IS_SUN3X) {
369                 dvma_init();
370         }
371 #endif
372
373 #endif /* !CONFIG_SUN3 */
374
375 /* set ISA defs early as possible */
376 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
377         if (MACH_IS_Q40) {
378                 isa_type = ISA_TYPE_Q40;
379                 isa_sex = 0;
380         }
381 #ifdef CONFIG_AMIGA_PCMCIA
382         if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
383                 isa_type = ISA_TYPE_AG;
384                 isa_sex = 1;
385         }
386 #endif
387 #ifdef CONFIG_ATARI_ROM_ISA
388         if (MACH_IS_ATARI) {
389                 isa_type = ISA_TYPE_ENEC;
390                 isa_sex = 0;
391         }
392 #endif
393 #endif
394 }
395
396 static int show_cpuinfo(struct seq_file *m, void *v)
397 {
398         const char *cpu, *mmu, *fpu;
399         unsigned long clockfreq, clockfactor;
400
401 #define LOOP_CYCLES_68020       (8)
402 #define LOOP_CYCLES_68030       (8)
403 #define LOOP_CYCLES_68040       (3)
404 #define LOOP_CYCLES_68060       (1)
405 #define LOOP_CYCLES_COLDFIRE    (2)
406
407         if (CPU_IS_020) {
408                 cpu = "68020";
409                 clockfactor = LOOP_CYCLES_68020;
410         } else if (CPU_IS_030) {
411                 cpu = "68030";
412                 clockfactor = LOOP_CYCLES_68030;
413         } else if (CPU_IS_040) {
414                 cpu = "68040";
415                 clockfactor = LOOP_CYCLES_68040;
416         } else if (CPU_IS_060) {
417                 cpu = "68060";
418                 clockfactor = LOOP_CYCLES_68060;
419         } else if (CPU_IS_COLDFIRE) {
420                 cpu = "ColdFire";
421                 clockfactor = LOOP_CYCLES_COLDFIRE;
422         } else {
423                 cpu = "680x0";
424                 clockfactor = 0;
425         }
426
427 #ifdef CONFIG_M68KFPU_EMU_ONLY
428         fpu = "none(soft float)";
429 #else
430         if (m68k_fputype & FPU_68881)
431                 fpu = "68881";
432         else if (m68k_fputype & FPU_68882)
433                 fpu = "68882";
434         else if (m68k_fputype & FPU_68040)
435                 fpu = "68040";
436         else if (m68k_fputype & FPU_68060)
437                 fpu = "68060";
438         else if (m68k_fputype & FPU_SUNFPA)
439                 fpu = "Sun FPA";
440         else if (m68k_fputype & FPU_COLDFIRE)
441                 fpu = "ColdFire";
442         else
443                 fpu = "none";
444 #endif
445
446         if (m68k_mmutype & MMU_68851)
447                 mmu = "68851";
448         else if (m68k_mmutype & MMU_68030)
449                 mmu = "68030";
450         else if (m68k_mmutype & MMU_68040)
451                 mmu = "68040";
452         else if (m68k_mmutype & MMU_68060)
453                 mmu = "68060";
454         else if (m68k_mmutype & MMU_SUN3)
455                 mmu = "Sun-3";
456         else if (m68k_mmutype & MMU_APOLLO)
457                 mmu = "Apollo";
458         else if (m68k_mmutype & MMU_COLDFIRE)
459                 mmu = "ColdFire";
460         else
461                 mmu = "unknown";
462
463         clockfreq = loops_per_jiffy * HZ * clockfactor;
464
465         seq_printf(m, "CPU:\t\t%s\n"
466                    "MMU:\t\t%s\n"
467                    "FPU:\t\t%s\n"
468                    "Clocking:\t%lu.%1luMHz\n"
469                    "BogoMips:\t%lu.%02lu\n"
470                    "Calibration:\t%lu loops\n",
471                    cpu, mmu, fpu,
472                    clockfreq/1000000,(clockfreq/100000)%10,
473                    loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
474                    loops_per_jiffy);
475         return 0;
476 }
477
478 static void *c_start(struct seq_file *m, loff_t *pos)
479 {
480         return *pos < 1 ? (void *)1 : NULL;
481 }
482 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
483 {
484         ++*pos;
485         return NULL;
486 }
487 static void c_stop(struct seq_file *m, void *v)
488 {
489 }
490 const struct seq_operations cpuinfo_op = {
491         .start  = c_start,
492         .next   = c_next,
493         .stop   = c_stop,
494         .show   = show_cpuinfo,
495 };
496
497 #ifdef CONFIG_PROC_HARDWARE
498 static int hardware_proc_show(struct seq_file *m, void *v)
499 {
500         char model[80];
501         unsigned long mem;
502         int i;
503
504         if (mach_get_model)
505                 mach_get_model(model);
506         else
507                 strcpy(model, "Unknown m68k");
508
509         seq_printf(m, "Model:\t\t%s\n", model);
510         for (mem = 0, i = 0; i < m68k_num_memory; i++)
511                 mem += m68k_memory[i].size;
512         seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
513
514         if (mach_get_hardware_list)
515                 mach_get_hardware_list(m);
516
517         return 0;
518 }
519
520 static int __init proc_hardware_init(void)
521 {
522         proc_create_single("hardware", 0, NULL, hardware_proc_show);
523         return 0;
524 }
525 module_init(proc_hardware_init);
526 #endif
527
528 void check_bugs(void)
529 {
530 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
531         if (m68k_fputype == 0) {
532                 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
533                         "WHICH IS REQUIRED BY LINUX/M68K ***\n");
534                 pr_emerg("Upgrade your hardware or join the FPU "
535                         "emulation project\n");
536                 panic("no FPU");
537         }
538 #endif /* !CONFIG_M68KFPU_EMU */
539 }
540
541 #ifdef CONFIG_ADB
542 static int __init adb_probe_sync_enable (char *str) {
543         extern int __adb_probe_sync;
544         __adb_probe_sync = 1;
545         return 1;
546 }
547
548 __setup("adb_sync", adb_probe_sync_enable);
549 #endif /* CONFIG_ADB */