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Linux/arch/m68k/kernel/setup_mm.c

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  1 /*
  2  *  linux/arch/m68k/kernel/setup.c
  3  *
  4  *  Copyright (C) 1995  Hamish Macdonald
  5  */
  6 
  7 /*
  8  * This file handles the architecture-dependent parts of system setup
  9  */
 10 
 11 #include <linux/kernel.h>
 12 #include <linux/mm.h>
 13 #include <linux/sched.h>
 14 #include <linux/delay.h>
 15 #include <linux/interrupt.h>
 16 #include <linux/fs.h>
 17 #include <linux/console.h>
 18 #include <linux/genhd.h>
 19 #include <linux/errno.h>
 20 #include <linux/string.h>
 21 #include <linux/init.h>
 22 #include <linux/bootmem.h>
 23 #include <linux/proc_fs.h>
 24 #include <linux/seq_file.h>
 25 #include <linux/module.h>
 26 #include <linux/initrd.h>
 27 
 28 #include <asm/bootinfo.h>
 29 #include <asm/byteorder.h>
 30 #include <asm/sections.h>
 31 #include <asm/setup.h>
 32 #include <asm/fpu.h>
 33 #include <asm/irq.h>
 34 #include <asm/io.h>
 35 #include <asm/machdep.h>
 36 #ifdef CONFIG_AMIGA
 37 #include <asm/amigahw.h>
 38 #endif
 39 #ifdef CONFIG_ATARI
 40 #include <asm/atarihw.h>
 41 #include <asm/atari_stram.h>
 42 #endif
 43 #ifdef CONFIG_SUN3X
 44 #include <asm/dvma.h>
 45 #endif
 46 #include <asm/natfeat.h>
 47 
 48 #if !FPSTATESIZE || !NR_IRQS
 49 #warning No CPU/platform type selected, your kernel will not work!
 50 #warning Are you building an allnoconfig kernel?
 51 #endif
 52 
 53 unsigned long m68k_machtype;
 54 EXPORT_SYMBOL(m68k_machtype);
 55 unsigned long m68k_cputype;
 56 EXPORT_SYMBOL(m68k_cputype);
 57 unsigned long m68k_fputype;
 58 unsigned long m68k_mmutype;
 59 EXPORT_SYMBOL(m68k_mmutype);
 60 #ifdef CONFIG_VME
 61 unsigned long vme_brdtype;
 62 EXPORT_SYMBOL(vme_brdtype);
 63 #endif
 64 
 65 int m68k_is040or060;
 66 EXPORT_SYMBOL(m68k_is040or060);
 67 
 68 extern unsigned long availmem;
 69 
 70 int m68k_num_memory;
 71 EXPORT_SYMBOL(m68k_num_memory);
 72 int m68k_realnum_memory;
 73 EXPORT_SYMBOL(m68k_realnum_memory);
 74 unsigned long m68k_memoffset;
 75 struct m68k_mem_info m68k_memory[NUM_MEMINFO];
 76 EXPORT_SYMBOL(m68k_memory);
 77 
 78 static struct m68k_mem_info m68k_ramdisk __initdata;
 79 
 80 static char m68k_command_line[CL_SIZE] __initdata;
 81 
 82 void (*mach_sched_init) (irq_handler_t handler) __initdata = NULL;
 83 /* machine dependent irq functions */
 84 void (*mach_init_IRQ) (void) __initdata = NULL;
 85 void (*mach_get_model) (char *model);
 86 void (*mach_get_hardware_list) (struct seq_file *m);
 87 /* machine dependent timer functions */
 88 int (*mach_hwclk) (int, struct rtc_time*);
 89 EXPORT_SYMBOL(mach_hwclk);
 90 int (*mach_set_clock_mmss) (unsigned long);
 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_INPUT_M68K_BEEP) || defined(CONFIG_INPUT_M68K_BEEP_MODULE)
109 void (*mach_beep)(unsigned int, unsigned int);
110 EXPORT_SYMBOL(mach_beep);
111 #endif
112 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
113 int isa_type;
114 int isa_sex;
115 EXPORT_SYMBOL(isa_type);
116 EXPORT_SYMBOL(isa_sex);
117 #endif
118 
119 extern int amiga_parse_bootinfo(const struct bi_record *);
120 extern int atari_parse_bootinfo(const struct bi_record *);
121 extern int mac_parse_bootinfo(const struct bi_record *);
122 extern int q40_parse_bootinfo(const struct bi_record *);
123 extern int bvme6000_parse_bootinfo(const struct bi_record *);
124 extern int mvme16x_parse_bootinfo(const struct bi_record *);
125 extern int mvme147_parse_bootinfo(const struct bi_record *);
126 extern int hp300_parse_bootinfo(const struct bi_record *);
127 extern int apollo_parse_bootinfo(const struct bi_record *);
128 
129 extern void config_amiga(void);
130 extern void config_atari(void);
131 extern void config_mac(void);
132 extern void config_sun3(void);
133 extern void config_apollo(void);
134 extern void config_mvme147(void);
135 extern void config_mvme16x(void);
136 extern void config_bvme6000(void);
137 extern void config_hp300(void);
138 extern void config_q40(void);
139 extern void config_sun3x(void);
140 
141 #define MASK_256K 0xfffc0000
142 
143 extern void paging_init(void);
144 
145 static void __init m68k_parse_bootinfo(const struct bi_record *record)
146 {
147         uint16_t tag;
148 
149         save_bootinfo(record);
150 
151         while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
152                 int unknown = 0;
153                 const void *data = record->data;
154                 uint16_t size = be16_to_cpu(record->size);
155 
156                 switch (tag) {
157                 case BI_MACHTYPE:
158                 case BI_CPUTYPE:
159                 case BI_FPUTYPE:
160                 case BI_MMUTYPE:
161                         /* Already set up by head.S */
162                         break;
163 
164                 case BI_MEMCHUNK:
165                         if (m68k_num_memory < NUM_MEMINFO) {
166                                 const struct mem_info *m = data;
167                                 m68k_memory[m68k_num_memory].addr =
168                                         be32_to_cpu(m->addr);
169                                 m68k_memory[m68k_num_memory].size =
170                                         be32_to_cpu(m->size);
171                                 m68k_num_memory++;
172                         } else
173                                 pr_warn("%s: too many memory chunks\n",
174                                         __func__);
175                         break;
176 
177                 case BI_RAMDISK:
178                         {
179                                 const struct mem_info *m = data;
180                                 m68k_ramdisk.addr = be32_to_cpu(m->addr);
181                                 m68k_ramdisk.size = be32_to_cpu(m->size);
182                         }
183                         break;
184 
185                 case BI_COMMAND_LINE:
186                         strlcpy(m68k_command_line, data,
187                                 sizeof(m68k_command_line));
188                         break;
189 
190                 default:
191                         if (MACH_IS_AMIGA)
192                                 unknown = amiga_parse_bootinfo(record);
193                         else if (MACH_IS_ATARI)
194                                 unknown = atari_parse_bootinfo(record);
195                         else if (MACH_IS_MAC)
196                                 unknown = mac_parse_bootinfo(record);
197                         else if (MACH_IS_Q40)
198                                 unknown = q40_parse_bootinfo(record);
199                         else if (MACH_IS_BVME6000)
200                                 unknown = bvme6000_parse_bootinfo(record);
201                         else if (MACH_IS_MVME16x)
202                                 unknown = mvme16x_parse_bootinfo(record);
203                         else if (MACH_IS_MVME147)
204                                 unknown = mvme147_parse_bootinfo(record);
205                         else if (MACH_IS_HP300)
206                                 unknown = hp300_parse_bootinfo(record);
207                         else if (MACH_IS_APOLLO)
208                                 unknown = apollo_parse_bootinfo(record);
209                         else
210                                 unknown = 1;
211                 }
212                 if (unknown)
213                         pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
214                                 tag);
215                 record = (struct bi_record *)((unsigned long)record + size);
216         }
217 
218         m68k_realnum_memory = m68k_num_memory;
219 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
220         if (m68k_num_memory > 1) {
221                 pr_warn("%s: ignoring last %i chunks of physical memory\n",
222                         __func__, (m68k_num_memory - 1));
223                 m68k_num_memory = 1;
224         }
225 #endif
226 }
227 
228 void __init setup_arch(char **cmdline_p)
229 {
230 #ifndef CONFIG_SUN3
231         int i;
232 #endif
233 
234         /* The bootinfo is located right after the kernel */
235         if (!CPU_IS_COLDFIRE)
236                 m68k_parse_bootinfo((const struct bi_record *)_end);
237 
238         if (CPU_IS_040)
239                 m68k_is040or060 = 4;
240         else if (CPU_IS_060)
241                 m68k_is040or060 = 6;
242 
243         /* FIXME: m68k_fputype is passed in by Penguin booter, which can
244          * be confused by software FPU emulation. BEWARE.
245          * We should really do our own FPU check at startup.
246          * [what do we do with buggy 68LC040s? if we have problems
247          *  with them, we should add a test to check_bugs() below] */
248 #ifndef CONFIG_M68KFPU_EMU_ONLY
249         /* clear the fpu if we have one */
250         if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
251                 volatile int zero = 0;
252                 asm volatile ("frestore %0" : : "m" (zero));
253         }
254 #endif
255 
256         if (CPU_IS_060) {
257                 u32 pcr;
258 
259                 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
260                      : "=d" (pcr));
261                 if (((pcr >> 8) & 0xff) <= 5) {
262                         pr_warn("Enabling workaround for errata I14\n");
263                         asm (".chip 68060; movec %0,%%pcr; .chip 68k"
264                              : : "d" (pcr | 0x20));
265                 }
266         }
267 
268         init_mm.start_code = PAGE_OFFSET;
269         init_mm.end_code = (unsigned long)_etext;
270         init_mm.end_data = (unsigned long)_edata;
271         init_mm.brk = (unsigned long)_end;
272 
273 #if defined(CONFIG_BOOTPARAM)
274         strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
275         m68k_command_line[CL_SIZE - 1] = 0;
276 #endif /* CONFIG_BOOTPARAM */
277         *cmdline_p = m68k_command_line;
278         memcpy(boot_command_line, *cmdline_p, CL_SIZE);
279 
280         parse_early_param();
281 
282 #ifdef CONFIG_DUMMY_CONSOLE
283         conswitchp = &dummy_con;
284 #endif
285 
286         switch (m68k_machtype) {
287 #ifdef CONFIG_AMIGA
288         case MACH_AMIGA:
289                 config_amiga();
290                 break;
291 #endif
292 #ifdef CONFIG_ATARI
293         case MACH_ATARI:
294                 config_atari();
295                 break;
296 #endif
297 #ifdef CONFIG_MAC
298         case MACH_MAC:
299                 config_mac();
300                 break;
301 #endif
302 #ifdef CONFIG_SUN3
303         case MACH_SUN3:
304                 config_sun3();
305                 break;
306 #endif
307 #ifdef CONFIG_APOLLO
308         case MACH_APOLLO:
309                 config_apollo();
310                 break;
311 #endif
312 #ifdef CONFIG_MVME147
313         case MACH_MVME147:
314                 config_mvme147();
315                 break;
316 #endif
317 #ifdef CONFIG_MVME16x
318         case MACH_MVME16x:
319                 config_mvme16x();
320                 break;
321 #endif
322 #ifdef CONFIG_BVME6000
323         case MACH_BVME6000:
324                 config_bvme6000();
325                 break;
326 #endif
327 #ifdef CONFIG_HP300
328         case MACH_HP300:
329                 config_hp300();
330                 break;
331 #endif
332 #ifdef CONFIG_Q40
333         case MACH_Q40:
334                 config_q40();
335                 break;
336 #endif
337 #ifdef CONFIG_SUN3X
338         case MACH_SUN3X:
339                 config_sun3x();
340                 break;
341 #endif
342 #ifdef CONFIG_COLDFIRE
343         case MACH_M54XX:
344                 config_BSP(NULL, 0);
345                 break;
346 #endif
347         default:
348                 panic("No configuration setup");
349         }
350 
351         paging_init();
352 
353 #ifdef CONFIG_NATFEAT
354         nf_init();
355 #endif
356 
357 #ifndef CONFIG_SUN3
358         for (i = 1; i < m68k_num_memory; i++)
359                 free_bootmem_node(NODE_DATA(i), m68k_memory[i].addr,
360                                   m68k_memory[i].size);
361 #ifdef CONFIG_BLK_DEV_INITRD
362         if (m68k_ramdisk.size) {
363                 reserve_bootmem_node(__virt_to_node(phys_to_virt(m68k_ramdisk.addr)),
364                                      m68k_ramdisk.addr, m68k_ramdisk.size,
365                                      BOOTMEM_DEFAULT);
366                 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
367                 initrd_end = initrd_start + m68k_ramdisk.size;
368                 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
369         }
370 #endif
371 
372 #ifdef CONFIG_ATARI
373         if (MACH_IS_ATARI)
374                 atari_stram_reserve_pages((void *)availmem);
375 #endif
376 #ifdef CONFIG_SUN3X
377         if (MACH_IS_SUN3X) {
378                 dvma_init();
379         }
380 #endif
381 
382 #endif /* !CONFIG_SUN3 */
383 
384 /* set ISA defs early as possible */
385 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
386         if (MACH_IS_Q40) {
387                 isa_type = ISA_TYPE_Q40;
388                 isa_sex = 0;
389         }
390 #ifdef CONFIG_AMIGA_PCMCIA
391         if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
392                 isa_type = ISA_TYPE_AG;
393                 isa_sex = 1;
394         }
395 #endif
396 #ifdef CONFIG_ATARI_ROM_ISA
397         if (MACH_IS_ATARI) {
398                 isa_type = ISA_TYPE_ENEC;
399                 isa_sex = 0;
400         }
401 #endif
402 #endif
403 }
404 
405 static int show_cpuinfo(struct seq_file *m, void *v)
406 {
407         const char *cpu, *mmu, *fpu;
408         unsigned long clockfreq, clockfactor;
409 
410 #define LOOP_CYCLES_68020       (8)
411 #define LOOP_CYCLES_68030       (8)
412 #define LOOP_CYCLES_68040       (3)
413 #define LOOP_CYCLES_68060       (1)
414 #define LOOP_CYCLES_COLDFIRE    (2)
415 
416         if (CPU_IS_020) {
417                 cpu = "68020";
418                 clockfactor = LOOP_CYCLES_68020;
419         } else if (CPU_IS_030) {
420                 cpu = "68030";
421                 clockfactor = LOOP_CYCLES_68030;
422         } else if (CPU_IS_040) {
423                 cpu = "68040";
424                 clockfactor = LOOP_CYCLES_68040;
425         } else if (CPU_IS_060) {
426                 cpu = "68060";
427                 clockfactor = LOOP_CYCLES_68060;
428         } else if (CPU_IS_COLDFIRE) {
429                 cpu = "ColdFire";
430                 clockfactor = LOOP_CYCLES_COLDFIRE;
431         } else {
432                 cpu = "680x0";
433                 clockfactor = 0;
434         }
435 
436 #ifdef CONFIG_M68KFPU_EMU_ONLY
437         fpu = "none(soft float)";
438 #else
439         if (m68k_fputype & FPU_68881)
440                 fpu = "68881";
441         else if (m68k_fputype & FPU_68882)
442                 fpu = "68882";
443         else if (m68k_fputype & FPU_68040)
444                 fpu = "68040";
445         else if (m68k_fputype & FPU_68060)
446                 fpu = "68060";
447         else if (m68k_fputype & FPU_SUNFPA)
448                 fpu = "Sun FPA";
449         else if (m68k_fputype & FPU_COLDFIRE)
450                 fpu = "ColdFire";
451         else
452                 fpu = "none";
453 #endif
454 
455         if (m68k_mmutype & MMU_68851)
456                 mmu = "68851";
457         else if (m68k_mmutype & MMU_68030)
458                 mmu = "68030";
459         else if (m68k_mmutype & MMU_68040)
460                 mmu = "68040";
461         else if (m68k_mmutype & MMU_68060)
462                 mmu = "68060";
463         else if (m68k_mmutype & MMU_SUN3)
464                 mmu = "Sun-3";
465         else if (m68k_mmutype & MMU_APOLLO)
466                 mmu = "Apollo";
467         else if (m68k_mmutype & MMU_COLDFIRE)
468                 mmu = "ColdFire";
469         else
470                 mmu = "unknown";
471 
472         clockfreq = loops_per_jiffy * HZ * clockfactor;
473 
474         seq_printf(m, "CPU:\t\t%s\n"
475                    "MMU:\t\t%s\n"
476                    "FPU:\t\t%s\n"
477                    "Clocking:\t%lu.%1luMHz\n"
478                    "BogoMips:\t%lu.%02lu\n"
479                    "Calibration:\t%lu loops\n",
480                    cpu, mmu, fpu,
481                    clockfreq/1000000,(clockfreq/100000)%10,
482                    loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
483                    loops_per_jiffy);
484         return 0;
485 }
486 
487 static void *c_start(struct seq_file *m, loff_t *pos)
488 {
489         return *pos < 1 ? (void *)1 : NULL;
490 }
491 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
492 {
493         ++*pos;
494         return NULL;
495 }
496 static void c_stop(struct seq_file *m, void *v)
497 {
498 }
499 const struct seq_operations cpuinfo_op = {
500         .start  = c_start,
501         .next   = c_next,
502         .stop   = c_stop,
503         .show   = show_cpuinfo,
504 };
505 
506 #ifdef CONFIG_PROC_HARDWARE
507 static int hardware_proc_show(struct seq_file *m, void *v)
508 {
509         char model[80];
510         unsigned long mem;
511         int i;
512 
513         if (mach_get_model)
514                 mach_get_model(model);
515         else
516                 strcpy(model, "Unknown m68k");
517 
518         seq_printf(m, "Model:\t\t%s\n", model);
519         for (mem = 0, i = 0; i < m68k_num_memory; i++)
520                 mem += m68k_memory[i].size;
521         seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
522 
523         if (mach_get_hardware_list)
524                 mach_get_hardware_list(m);
525 
526         return 0;
527 }
528 
529 static int hardware_proc_open(struct inode *inode, struct file *file)
530 {
531         return single_open(file, hardware_proc_show, NULL);
532 }
533 
534 static const struct file_operations hardware_proc_fops = {
535         .open           = hardware_proc_open,
536         .read           = seq_read,
537         .llseek         = seq_lseek,
538         .release        = single_release,
539 };
540 
541 static int __init proc_hardware_init(void)
542 {
543         proc_create("hardware", 0, NULL, &hardware_proc_fops);
544         return 0;
545 }
546 module_init(proc_hardware_init);
547 #endif
548 
549 void check_bugs(void)
550 {
551 #ifndef CONFIG_M68KFPU_EMU
552         if (m68k_fputype == 0) {
553                 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
554                         "WHICH IS REQUIRED BY LINUX/M68K ***\n");
555                 pr_emerg("Upgrade your hardware or join the FPU "
556                         "emulation project\n");
557                 panic("no FPU");
558         }
559 #endif /* !CONFIG_M68KFPU_EMU */
560 }
561 
562 #ifdef CONFIG_ADB
563 static int __init adb_probe_sync_enable (char *str) {
564         extern int __adb_probe_sync;
565         __adb_probe_sync = 1;
566         return 1;
567 }
568 
569 __setup("adb_sync", adb_probe_sync_enable);
570 #endif /* CONFIG_ADB */
571 

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