1 // SPDX-License-Identifier: GPL-2.0
3 * linux/arch/m68k/kernel/setup.c
5 * Copyright (C) 1995 Hamish Macdonald
9 * This file handles the architecture-dependent parts of system setup
12 #include <linux/kernel.h>
14 #include <linux/sched.h>
15 #include <linux/delay.h>
16 #include <linux/interrupt.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/memblock.h>
25 #include <linux/proc_fs.h>
26 #include <linux/seq_file.h>
27 #include <linux/module.h>
28 #include <linux/initrd.h>
30 #include <asm/bootinfo.h>
31 #include <asm/byteorder.h>
32 #include <asm/sections.h>
33 #include <asm/setup.h>
37 #include <asm/machdep.h>
39 #include <asm/amigahw.h>
42 #include <asm/atarihw.h>
43 #include <asm/atari_stram.h>
48 #include <asm/natfeat.h>
50 #if !FPSTATESIZE || !NR_IRQS
51 #warning No CPU/platform type selected, your kernel will not work!
52 #warning Are you building an allnoconfig kernel?
55 unsigned long m68k_machtype;
56 EXPORT_SYMBOL(m68k_machtype);
57 unsigned long m68k_cputype;
58 EXPORT_SYMBOL(m68k_cputype);
59 unsigned long m68k_fputype;
60 unsigned long m68k_mmutype;
61 EXPORT_SYMBOL(m68k_mmutype);
63 unsigned long vme_brdtype;
64 EXPORT_SYMBOL(vme_brdtype);
68 EXPORT_SYMBOL(m68k_is040or060);
70 extern unsigned long availmem;
73 EXPORT_SYMBOL(m68k_num_memory);
74 int m68k_realnum_memory;
75 EXPORT_SYMBOL(m68k_realnum_memory);
76 unsigned long m68k_memoffset;
77 struct m68k_mem_info m68k_memory[NUM_MEMINFO];
78 EXPORT_SYMBOL(m68k_memory);
80 static struct m68k_mem_info m68k_ramdisk __initdata;
82 static char m68k_command_line[CL_SIZE] __initdata;
84 void (*mach_sched_init) (irq_handler_t handler) __initdata = NULL;
85 /* machine dependent irq functions */
86 void (*mach_init_IRQ) (void) __initdata = NULL;
87 void (*mach_get_model) (char *model);
88 void (*mach_get_hardware_list) (struct seq_file *m);
89 /* machine dependent timer functions */
90 int (*mach_hwclk) (int, struct rtc_time*);
91 EXPORT_SYMBOL(mach_hwclk);
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);
106 #ifdef CONFIG_M68K_L2_CACHE
107 void (*mach_l2_flush) (int);
109 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
112 EXPORT_SYMBOL(isa_type);
113 EXPORT_SYMBOL(isa_sex);
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 *);
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);
138 #define MASK_256K 0xfffc0000
140 extern void paging_init(void);
142 static void __init m68k_parse_bootinfo(const struct bi_record *record)
146 save_bootinfo(record);
148 while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
150 const void *data = record->data;
151 uint16_t size = be16_to_cpu(record->size);
158 /* Already set up by head.S */
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);
170 pr_warn("%s: too many memory chunks\n",
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);
182 case BI_COMMAND_LINE:
183 strlcpy(m68k_command_line, data,
184 sizeof(m68k_command_line));
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);
210 pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
212 record = (struct bi_record *)((unsigned long)record + size);
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));
225 void __init setup_arch(char **cmdline_p)
227 /* The bootinfo is located right after the kernel */
228 if (!CPU_IS_COLDFIRE)
229 m68k_parse_bootinfo((const struct bi_record *)_end);
236 /* FIXME: m68k_fputype is passed in by Penguin booter, which can
237 * be confused by software FPU emulation. BEWARE.
238 * We should really do our own FPU check at startup.
239 * [what do we do with buggy 68LC040s? if we have problems
240 * with them, we should add a test to check_bugs() below] */
241 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
242 /* clear the fpu if we have one */
243 if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
244 volatile int zero = 0;
245 asm volatile ("frestore %0" : : "m" (zero));
252 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
254 if (((pcr >> 8) & 0xff) <= 5) {
255 pr_warn("Enabling workaround for errata I14\n");
256 asm (".chip 68060; movec %0,%%pcr; .chip 68k"
257 : : "d" (pcr | 0x20));
261 init_mm.start_code = PAGE_OFFSET;
262 init_mm.end_code = (unsigned long)_etext;
263 init_mm.end_data = (unsigned long)_edata;
264 init_mm.brk = (unsigned long)_end;
266 #if defined(CONFIG_BOOTPARAM)
267 strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
268 m68k_command_line[CL_SIZE - 1] = 0;
269 #endif /* CONFIG_BOOTPARAM */
270 process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
271 *cmdline_p = m68k_command_line;
272 memcpy(boot_command_line, *cmdline_p, CL_SIZE);
276 #ifdef CONFIG_DUMMY_CONSOLE
277 conswitchp = &dummy_con;
280 switch (m68k_machtype) {
306 #ifdef CONFIG_MVME147
311 #ifdef CONFIG_MVME16x
316 #ifdef CONFIG_BVME6000
336 #ifdef CONFIG_COLDFIRE
340 cf_mmu_context_init();
345 panic("No configuration setup");
350 #ifdef CONFIG_NATFEAT
355 #ifdef CONFIG_BLK_DEV_INITRD
356 if (m68k_ramdisk.size) {
357 memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);
358 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
359 initrd_end = initrd_start + m68k_ramdisk.size;
360 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
366 atari_stram_reserve_pages((void *)availmem);
374 #endif /* !CONFIG_SUN3 */
376 /* set ISA defs early as possible */
377 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
379 isa_type = ISA_TYPE_Q40;
382 #ifdef CONFIG_AMIGA_PCMCIA
383 if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
384 isa_type = ISA_TYPE_AG;
388 #ifdef CONFIG_ATARI_ROM_ISA
390 isa_type = ISA_TYPE_ENEC;
397 static int show_cpuinfo(struct seq_file *m, void *v)
399 const char *cpu, *mmu, *fpu;
400 unsigned long clockfreq, clockfactor;
402 #define LOOP_CYCLES_68020 (8)
403 #define LOOP_CYCLES_68030 (8)
404 #define LOOP_CYCLES_68040 (3)
405 #define LOOP_CYCLES_68060 (1)
406 #define LOOP_CYCLES_COLDFIRE (2)
410 clockfactor = LOOP_CYCLES_68020;
411 } else if (CPU_IS_030) {
413 clockfactor = LOOP_CYCLES_68030;
414 } else if (CPU_IS_040) {
416 clockfactor = LOOP_CYCLES_68040;
417 } else if (CPU_IS_060) {
419 clockfactor = LOOP_CYCLES_68060;
420 } else if (CPU_IS_COLDFIRE) {
422 clockfactor = LOOP_CYCLES_COLDFIRE;
428 #ifdef CONFIG_M68KFPU_EMU_ONLY
429 fpu = "none(soft float)";
431 if (m68k_fputype & FPU_68881)
433 else if (m68k_fputype & FPU_68882)
435 else if (m68k_fputype & FPU_68040)
437 else if (m68k_fputype & FPU_68060)
439 else if (m68k_fputype & FPU_SUNFPA)
441 else if (m68k_fputype & FPU_COLDFIRE)
447 if (m68k_mmutype & MMU_68851)
449 else if (m68k_mmutype & MMU_68030)
451 else if (m68k_mmutype & MMU_68040)
453 else if (m68k_mmutype & MMU_68060)
455 else if (m68k_mmutype & MMU_SUN3)
457 else if (m68k_mmutype & MMU_APOLLO)
459 else if (m68k_mmutype & MMU_COLDFIRE)
464 clockfreq = loops_per_jiffy * HZ * clockfactor;
466 seq_printf(m, "CPU:\t\t%s\n"
469 "Clocking:\t%lu.%1luMHz\n"
470 "BogoMips:\t%lu.%02lu\n"
471 "Calibration:\t%lu loops\n",
473 clockfreq/1000000,(clockfreq/100000)%10,
474 loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
479 static void *c_start(struct seq_file *m, loff_t *pos)
481 return *pos < 1 ? (void *)1 : NULL;
483 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
488 static void c_stop(struct seq_file *m, void *v)
491 const struct seq_operations cpuinfo_op = {
495 .show = show_cpuinfo,
498 #ifdef CONFIG_PROC_HARDWARE
499 static int hardware_proc_show(struct seq_file *m, void *v)
506 mach_get_model(model);
508 strcpy(model, "Unknown m68k");
510 seq_printf(m, "Model:\t\t%s\n", model);
511 for (mem = 0, i = 0; i < m68k_num_memory; i++)
512 mem += m68k_memory[i].size;
513 seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
515 if (mach_get_hardware_list)
516 mach_get_hardware_list(m);
521 static int __init proc_hardware_init(void)
523 proc_create_single("hardware", 0, NULL, hardware_proc_show);
526 module_init(proc_hardware_init);
529 void check_bugs(void)
531 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
532 if (m68k_fputype == 0) {
533 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
534 "WHICH IS REQUIRED BY LINUX/M68K ***\n");
535 pr_emerg("Upgrade your hardware or join the FPU "
536 "emulation project\n");
539 #endif /* !CONFIG_M68KFPU_EMU */
543 static int __init adb_probe_sync_enable (char *str) {
544 extern int __adb_probe_sync;
545 __adb_probe_sync = 1;
549 __setup("adb_sync", adb_probe_sync_enable);
550 #endif /* CONFIG_ADB */