m68k: discontinuous memory support
[linux-2.6.git] / arch / m68k / kernel / setup.c
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/seq_file.h>
24 #include <linux/module.h>
25 #include <linux/initrd.h>
26
27 #include <asm/bootinfo.h>
28 #include <asm/setup.h>
29 #include <asm/irq.h>
30 #include <asm/io.h>
31 #include <asm/machdep.h>
32 #ifdef CONFIG_AMIGA
33 #include <asm/amigahw.h>
34 #endif
35 #ifdef CONFIG_ATARI
36 #include <asm/atarihw.h>
37 #include <asm/atari_stram.h>
38 #endif
39 #ifdef CONFIG_SUN3X
40 #include <asm/dvma.h>
41 #endif
42
43 unsigned long m68k_machtype;
44 unsigned long m68k_cputype;
45 EXPORT_SYMBOL(m68k_machtype);
46 EXPORT_SYMBOL(m68k_cputype);
47 unsigned long m68k_fputype;
48 unsigned long m68k_mmutype;
49 #ifdef CONFIG_VME
50 unsigned long vme_brdtype;
51 EXPORT_SYMBOL(vme_brdtype);
52 #endif
53
54 int m68k_is040or060;
55 EXPORT_SYMBOL(m68k_is040or060);
56
57 extern int end;
58 extern unsigned long availmem;
59
60 int m68k_num_memory;
61 int m68k_realnum_memory;
62 EXPORT_SYMBOL(m68k_realnum_memory);
63 unsigned long m68k_memoffset;
64 EXPORT_SYMBOL(m68k_memoffset);
65 struct mem_info m68k_memory[NUM_MEMINFO];
66 EXPORT_SYMBOL(m68k_memory);
67
68 struct mem_info m68k_ramdisk;
69
70 static char m68k_command_line[CL_SIZE];
71
72 void (*mach_sched_init) (irq_handler_t handler) __initdata = NULL;
73 /* machine dependent irq functions */
74 void (*mach_init_IRQ) (void) __initdata = NULL;
75 void (*mach_get_model) (char *model);
76 int (*mach_get_hardware_list) (char *buffer);
77 /* machine dependent timer functions */
78 unsigned long (*mach_gettimeoffset) (void);
79 int (*mach_hwclk) (int, struct rtc_time*);
80 EXPORT_SYMBOL(mach_hwclk);
81 int (*mach_set_clock_mmss) (unsigned long);
82 unsigned int (*mach_get_ss)(void);
83 int (*mach_get_rtc_pll)(struct rtc_pll_info *);
84 int (*mach_set_rtc_pll)(struct rtc_pll_info *);
85 EXPORT_SYMBOL(mach_get_ss);
86 EXPORT_SYMBOL(mach_get_rtc_pll);
87 EXPORT_SYMBOL(mach_set_rtc_pll);
88 void (*mach_reset)( void );
89 void (*mach_halt)( void );
90 void (*mach_power_off)( void );
91 long mach_max_dma_address = 0x00ffffff; /* default set to the lower 16MB */
92 #ifdef CONFIG_HEARTBEAT
93 void (*mach_heartbeat) (int);
94 EXPORT_SYMBOL(mach_heartbeat);
95 #endif
96 #ifdef CONFIG_M68K_L2_CACHE
97 void (*mach_l2_flush) (int);
98 #endif
99 #if defined(CONFIG_INPUT_M68K_BEEP) || defined(CONFIG_INPUT_M68K_BEEP_MODULE)
100 void (*mach_beep)(unsigned int, unsigned int);
101 EXPORT_SYMBOL(mach_beep);
102 #endif
103 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
104 int isa_type;
105 int isa_sex;
106 EXPORT_SYMBOL(isa_type);
107 EXPORT_SYMBOL(isa_sex);
108 #endif
109
110 extern int amiga_parse_bootinfo(const struct bi_record *);
111 extern int atari_parse_bootinfo(const struct bi_record *);
112 extern int mac_parse_bootinfo(const struct bi_record *);
113 extern int q40_parse_bootinfo(const struct bi_record *);
114 extern int bvme6000_parse_bootinfo(const struct bi_record *);
115 extern int mvme16x_parse_bootinfo(const struct bi_record *);
116 extern int mvme147_parse_bootinfo(const struct bi_record *);
117 extern int hp300_parse_bootinfo(const struct bi_record *);
118
119 extern void config_amiga(void);
120 extern void config_atari(void);
121 extern void config_mac(void);
122 extern void config_sun3(void);
123 extern void config_apollo(void);
124 extern void config_mvme147(void);
125 extern void config_mvme16x(void);
126 extern void config_bvme6000(void);
127 extern void config_hp300(void);
128 extern void config_q40(void);
129 extern void config_sun3x(void);
130
131 #define MASK_256K 0xfffc0000
132
133 extern void paging_init(void);
134
135 static void __init m68k_parse_bootinfo(const struct bi_record *record)
136 {
137         while (record->tag != BI_LAST) {
138                 int unknown = 0;
139                 const unsigned long *data = record->data;
140
141                 switch (record->tag) {
142                 case BI_MACHTYPE:
143                 case BI_CPUTYPE:
144                 case BI_FPUTYPE:
145                 case BI_MMUTYPE:
146                         /* Already set up by head.S */
147                         break;
148
149                 case BI_MEMCHUNK:
150                         if (m68k_num_memory < NUM_MEMINFO) {
151                                 m68k_memory[m68k_num_memory].addr = data[0];
152                                 m68k_memory[m68k_num_memory].size = data[1];
153                                 m68k_num_memory++;
154                         } else
155                                 printk("m68k_parse_bootinfo: too many memory chunks\n");
156                         break;
157
158                 case BI_RAMDISK:
159                         m68k_ramdisk.addr = data[0];
160                         m68k_ramdisk.size = data[1];
161                         break;
162
163                 case BI_COMMAND_LINE:
164                         strlcpy(m68k_command_line, (const char *)data,
165                                 sizeof(m68k_command_line));
166                         break;
167
168                 default:
169                         if (MACH_IS_AMIGA)
170                                 unknown = amiga_parse_bootinfo(record);
171                         else if (MACH_IS_ATARI)
172                                 unknown = atari_parse_bootinfo(record);
173                         else if (MACH_IS_MAC)
174                                 unknown = mac_parse_bootinfo(record);
175                         else if (MACH_IS_Q40)
176                                 unknown = q40_parse_bootinfo(record);
177                         else if (MACH_IS_BVME6000)
178                                 unknown = bvme6000_parse_bootinfo(record);
179                         else if (MACH_IS_MVME16x)
180                                 unknown = mvme16x_parse_bootinfo(record);
181                         else if (MACH_IS_MVME147)
182                                 unknown = mvme147_parse_bootinfo(record);
183                         else if (MACH_IS_HP300)
184                                 unknown = hp300_parse_bootinfo(record);
185                         else
186                                 unknown = 1;
187                 }
188                 if (unknown)
189                         printk("m68k_parse_bootinfo: unknown tag 0x%04x ignored\n",
190                                record->tag);
191                 record = (struct bi_record *)((unsigned long)record +
192                                               record->size);
193         }
194
195         m68k_realnum_memory = m68k_num_memory;
196 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
197         if (m68k_num_memory > 1) {
198                 printk("Ignoring last %i chunks of physical memory\n",
199                        (m68k_num_memory - 1));
200                 m68k_num_memory = 1;
201         }
202         m68k_memoffset = m68k_memory[0].addr-PAGE_OFFSET;
203 #endif
204 }
205
206 void __init setup_arch(char **cmdline_p)
207 {
208         extern int _etext, _edata, _end;
209         int i;
210
211         /* The bootinfo is located right after the kernel bss */
212         m68k_parse_bootinfo((const struct bi_record *)&_end);
213
214         if (CPU_IS_040)
215                 m68k_is040or060 = 4;
216         else if (CPU_IS_060)
217                 m68k_is040or060 = 6;
218
219         /* FIXME: m68k_fputype is passed in by Penguin booter, which can
220          * be confused by software FPU emulation. BEWARE.
221          * We should really do our own FPU check at startup.
222          * [what do we do with buggy 68LC040s? if we have problems
223          *  with them, we should add a test to check_bugs() below] */
224 #ifndef CONFIG_M68KFPU_EMU_ONLY
225         /* clear the fpu if we have one */
226         if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060)) {
227                 volatile int zero = 0;
228                 asm volatile ("frestore %0" : : "m" (zero));
229         }
230 #endif
231
232         if (CPU_IS_060) {
233                 u32 pcr;
234
235                 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
236                      : "=d" (pcr));
237                 if (((pcr >> 8) & 0xff) <= 5) {
238                         printk("Enabling workaround for errata I14\n");
239                         asm (".chip 68060; movec %0,%%pcr; .chip 68k"
240                              : : "d" (pcr | 0x20));
241                 }
242         }
243
244         init_mm.start_code = PAGE_OFFSET;
245         init_mm.end_code = (unsigned long) &_etext;
246         init_mm.end_data = (unsigned long) &_edata;
247         init_mm.brk = (unsigned long) &_end;
248
249         *cmdline_p = m68k_command_line;
250         memcpy(boot_command_line, *cmdline_p, CL_SIZE);
251
252         parse_early_param();
253
254 #ifdef CONFIG_DUMMY_CONSOLE
255         conswitchp = &dummy_con;
256 #endif
257
258         switch (m68k_machtype) {
259 #ifdef CONFIG_AMIGA
260         case MACH_AMIGA:
261                 config_amiga();
262                 break;
263 #endif
264 #ifdef CONFIG_ATARI
265         case MACH_ATARI:
266                 config_atari();
267                 break;
268 #endif
269 #ifdef CONFIG_MAC
270         case MACH_MAC:
271                 config_mac();
272                 break;
273 #endif
274 #ifdef CONFIG_SUN3
275         case MACH_SUN3:
276                 config_sun3();
277                 break;
278 #endif
279 #ifdef CONFIG_APOLLO
280         case MACH_APOLLO:
281                 config_apollo();
282                 break;
283 #endif
284 #ifdef CONFIG_MVME147
285         case MACH_MVME147:
286                 config_mvme147();
287                 break;
288 #endif
289 #ifdef CONFIG_MVME16x
290         case MACH_MVME16x:
291                 config_mvme16x();
292                 break;
293 #endif
294 #ifdef CONFIG_BVME6000
295         case MACH_BVME6000:
296                 config_bvme6000();
297                 break;
298 #endif
299 #ifdef CONFIG_HP300
300         case MACH_HP300:
301                 config_hp300();
302                 break;
303 #endif
304 #ifdef CONFIG_Q40
305         case MACH_Q40:
306                 config_q40();
307                 break;
308 #endif
309 #ifdef CONFIG_SUN3X
310         case MACH_SUN3X:
311                 config_sun3x();
312                 break;
313 #endif
314         default:
315                 panic("No configuration setup");
316         }
317
318         paging_init();
319
320 #ifndef CONFIG_SUN3
321         for (i = 1; i < m68k_num_memory; i++)
322                 free_bootmem_node(NODE_DATA(i), m68k_memory[i].addr,
323                                   m68k_memory[i].size);
324 #ifdef CONFIG_BLK_DEV_INITRD
325         if (m68k_ramdisk.size) {
326                 reserve_bootmem_node(__virt_to_node(phys_to_virt(m68k_ramdisk.addr)),
327                                      m68k_ramdisk.addr, m68k_ramdisk.size);
328                 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
329                 initrd_end = initrd_start + m68k_ramdisk.size;
330                 printk("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
331         }
332 #endif
333
334 #ifdef CONFIG_ATARI
335         if (MACH_IS_ATARI)
336                 atari_stram_reserve_pages((void *)availmem);
337 #endif
338 #ifdef CONFIG_SUN3X
339         if (MACH_IS_SUN3X) {
340                 dvma_init();
341         }
342 #endif
343
344 #endif /* !CONFIG_SUN3 */
345
346 /* set ISA defs early as possible */
347 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
348 #if defined(CONFIG_Q40)
349         if (MACH_IS_Q40) {
350                 isa_type = Q40_ISA;
351                 isa_sex = 0;
352         }
353 #elif defined(CONFIG_GG2)
354         if (MACH_IS_AMIGA && AMIGAHW_PRESENT(GG2_ISA)) {
355                 isa_type = GG2_ISA;
356                 isa_sex = 0;
357         }
358 #elif defined(CONFIG_AMIGA_PCMCIA)
359         if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
360                 isa_type = AG_ISA;
361                 isa_sex = 1;
362         }
363 #endif
364 #endif
365 }
366
367 static int show_cpuinfo(struct seq_file *m, void *v)
368 {
369         const char *cpu, *mmu, *fpu;
370         unsigned long clockfreq, clockfactor;
371
372 #define LOOP_CYCLES_68020       (8)
373 #define LOOP_CYCLES_68030       (8)
374 #define LOOP_CYCLES_68040       (3)
375 #define LOOP_CYCLES_68060       (1)
376
377         if (CPU_IS_020) {
378                 cpu = "68020";
379                 clockfactor = LOOP_CYCLES_68020;
380         } else if (CPU_IS_030) {
381                 cpu = "68030";
382                 clockfactor = LOOP_CYCLES_68030;
383         } else if (CPU_IS_040) {
384                 cpu = "68040";
385                 clockfactor = LOOP_CYCLES_68040;
386         } else if (CPU_IS_060) {
387                 cpu = "68060";
388                 clockfactor = LOOP_CYCLES_68060;
389         } else {
390                 cpu = "680x0";
391                 clockfactor = 0;
392         }
393
394 #ifdef CONFIG_M68KFPU_EMU_ONLY
395         fpu = "none(soft float)";
396 #else
397         if (m68k_fputype & FPU_68881)
398                 fpu = "68881";
399         else if (m68k_fputype & FPU_68882)
400                 fpu = "68882";
401         else if (m68k_fputype & FPU_68040)
402                 fpu = "68040";
403         else if (m68k_fputype & FPU_68060)
404                 fpu = "68060";
405         else if (m68k_fputype & FPU_SUNFPA)
406                 fpu = "Sun FPA";
407         else
408                 fpu = "none";
409 #endif
410
411         if (m68k_mmutype & MMU_68851)
412                 mmu = "68851";
413         else if (m68k_mmutype & MMU_68030)
414                 mmu = "68030";
415         else if (m68k_mmutype & MMU_68040)
416                 mmu = "68040";
417         else if (m68k_mmutype & MMU_68060)
418                 mmu = "68060";
419         else if (m68k_mmutype & MMU_SUN3)
420                 mmu = "Sun-3";
421         else if (m68k_mmutype & MMU_APOLLO)
422                 mmu = "Apollo";
423         else
424                 mmu = "unknown";
425
426         clockfreq = loops_per_jiffy * HZ * clockfactor;
427
428         seq_printf(m, "CPU:\t\t%s\n"
429                    "MMU:\t\t%s\n"
430                    "FPU:\t\t%s\n"
431                    "Clocking:\t%lu.%1luMHz\n"
432                    "BogoMips:\t%lu.%02lu\n"
433                    "Calibration:\t%lu loops\n",
434                    cpu, mmu, fpu,
435                    clockfreq/1000000,(clockfreq/100000)%10,
436                    loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
437                    loops_per_jiffy);
438         return 0;
439 }
440
441 static void *c_start(struct seq_file *m, loff_t *pos)
442 {
443         return *pos < 1 ? (void *)1 : NULL;
444 }
445 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
446 {
447         ++*pos;
448         return NULL;
449 }
450 static void c_stop(struct seq_file *m, void *v)
451 {
452 }
453 struct seq_operations cpuinfo_op = {
454         .start  = c_start,
455         .next   = c_next,
456         .stop   = c_stop,
457         .show   = show_cpuinfo,
458 };
459
460 int get_hardware_list(char *buffer)
461 {
462         int len = 0;
463         char model[80];
464         unsigned long mem;
465         int i;
466
467         if (mach_get_model)
468                 mach_get_model(model);
469         else
470                 strcpy(model, "Unknown m68k");
471
472         len += sprintf(buffer + len, "Model:\t\t%s\n", model);
473         for (mem = 0, i = 0; i < m68k_num_memory; i++)
474                 mem += m68k_memory[i].size;
475         len += sprintf(buffer + len, "System Memory:\t%ldK\n", mem >> 10);
476
477         if (mach_get_hardware_list)
478                 len += mach_get_hardware_list(buffer + len);
479
480         return len;
481 }
482
483 void check_bugs(void)
484 {
485 #ifndef CONFIG_M68KFPU_EMU
486         if (m68k_fputype == 0) {
487                 printk(KERN_EMERG "*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
488                         "WHICH IS REQUIRED BY LINUX/M68K ***\n");
489                 printk(KERN_EMERG "Upgrade your hardware or join the FPU "
490                         "emulation project\n");
491                 panic("no FPU");
492         }
493 #endif /* !CONFIG_M68KFPU_EMU */
494 }
495
496 #ifdef CONFIG_ADB
497 static int __init adb_probe_sync_enable (char *str) {
498         extern int __adb_probe_sync;
499         __adb_probe_sync = 1;
500         return 1;
501 }
502
503 __setup("adb_sync", adb_probe_sync_enable);
504 #endif /* CONFIG_ADB */