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Linux/arch/m68k/kernel/setup_mm.c

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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/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 hardware_proc_open(struct inode *inode, struct file *file)
531 {
532         return single_open(file, hardware_proc_show, NULL);
533 }
534 
535 static const struct file_operations hardware_proc_fops = {
536         .open           = hardware_proc_open,
537         .read           = seq_read,
538         .llseek         = seq_lseek,
539         .release        = single_release,
540 };
541 
542 static int __init proc_hardware_init(void)
543 {
544         proc_create("hardware", 0, NULL, &hardware_proc_fops);
545         return 0;
546 }
547 module_init(proc_hardware_init);
548 #endif
549 
550 void check_bugs(void)
551 {
552 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
553         if (m68k_fputype == 0) {
554                 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
555                         "WHICH IS REQUIRED BY LINUX/M68K ***\n");
556                 pr_emerg("Upgrade your hardware or join the FPU "
557                         "emulation project\n");
558                 panic("no FPU");
559         }
560 #endif /* !CONFIG_M68KFPU_EMU */
561 }
562 
563 #ifdef CONFIG_ADB
564 static int __init adb_probe_sync_enable (char *str) {
565         extern int __adb_probe_sync;
566         __adb_probe_sync = 1;
567         return 1;
568 }
569 
570 __setup("adb_sync", adb_probe_sync_enable);
571 #endif /* CONFIG_ADB */
572 

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