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/memblock.h>
24 #include <linux/proc_fs.h>
25 #include <linux/seq_file.h>
26 #include <linux/module.h>
27 #include <linux/initrd.h>
29 #include <asm/bootinfo.h>
30 #include <asm/byteorder.h>
31 #include <asm/sections.h>
32 #include <asm/setup.h>
36 #include <asm/machdep.h>
38 #include <asm/amigahw.h>
41 #include <asm/atarihw.h>
42 #include <asm/atari_stram.h>
47 #include <asm/natfeat.h>
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?
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);
62 unsigned long vme_brdtype;
63 EXPORT_SYMBOL(vme_brdtype);
67 EXPORT_SYMBOL(m68k_is040or060);
69 extern unsigned long availmem;
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);
79 static struct m68k_mem_info m68k_ramdisk __initdata;
81 static char m68k_command_line[CL_SIZE] __initdata;
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);
105 #ifdef CONFIG_M68K_L2_CACHE
106 void (*mach_l2_flush) (int);
108 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
111 EXPORT_SYMBOL(isa_type);
112 EXPORT_SYMBOL(isa_sex);
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 *);
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);
137 #define MASK_256K 0xfffc0000
139 extern void paging_init(void);
141 static void __init m68k_parse_bootinfo(const struct bi_record *record)
145 save_bootinfo(record);
147 while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
149 const void *data = record->data;
150 uint16_t size = be16_to_cpu(record->size);
157 /* Already set up by head.S */
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 memblock_add(m68k_memory[m68k_num_memory].addr,
168 m68k_memory[m68k_num_memory].size);
171 pr_warn("%s: too many memory chunks\n",
177 const struct mem_info *m = data;
178 m68k_ramdisk.addr = be32_to_cpu(m->addr);
179 m68k_ramdisk.size = be32_to_cpu(m->size);
183 case BI_COMMAND_LINE:
184 strlcpy(m68k_command_line, data,
185 sizeof(m68k_command_line));
190 unknown = amiga_parse_bootinfo(record);
191 else if (MACH_IS_ATARI)
192 unknown = atari_parse_bootinfo(record);
193 else if (MACH_IS_MAC)
194 unknown = mac_parse_bootinfo(record);
195 else if (MACH_IS_Q40)
196 unknown = q40_parse_bootinfo(record);
197 else if (MACH_IS_BVME6000)
198 unknown = bvme6000_parse_bootinfo(record);
199 else if (MACH_IS_MVME16x)
200 unknown = mvme16x_parse_bootinfo(record);
201 else if (MACH_IS_MVME147)
202 unknown = mvme147_parse_bootinfo(record);
203 else if (MACH_IS_HP300)
204 unknown = hp300_parse_bootinfo(record);
205 else if (MACH_IS_APOLLO)
206 unknown = apollo_parse_bootinfo(record);
211 pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
213 record = (struct bi_record *)((unsigned long)record + size);
216 m68k_realnum_memory = m68k_num_memory;
217 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
218 if (m68k_num_memory > 1) {
219 pr_warn("%s: ignoring last %i chunks of physical memory\n",
220 __func__, (m68k_num_memory - 1));
226 void __init setup_arch(char **cmdline_p)
228 /* The bootinfo is located right after the kernel */
229 if (!CPU_IS_COLDFIRE)
230 m68k_parse_bootinfo((const struct bi_record *)_end);
237 /* FIXME: m68k_fputype is passed in by Penguin booter, which can
238 * be confused by software FPU emulation. BEWARE.
239 * We should really do our own FPU check at startup.
240 * [what do we do with buggy 68LC040s? if we have problems
241 * with them, we should add a test to check_bugs() below] */
242 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
243 /* clear the fpu if we have one */
244 if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
245 volatile int zero = 0;
246 asm volatile ("frestore %0" : : "m" (zero));
253 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
255 if (((pcr >> 8) & 0xff) <= 5) {
256 pr_warn("Enabling workaround for errata I14\n");
257 asm (".chip 68060; movec %0,%%pcr; .chip 68k"
258 : : "d" (pcr | 0x20));
262 init_mm.start_code = PAGE_OFFSET;
263 init_mm.end_code = (unsigned long)_etext;
264 init_mm.end_data = (unsigned long)_edata;
265 init_mm.brk = (unsigned long)_end;
267 #if defined(CONFIG_BOOTPARAM)
268 strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
269 m68k_command_line[CL_SIZE - 1] = 0;
270 #endif /* CONFIG_BOOTPARAM */
271 process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
272 *cmdline_p = m68k_command_line;
273 memcpy(boot_command_line, *cmdline_p, CL_SIZE);
277 #ifdef CONFIG_DUMMY_CONSOLE
278 conswitchp = &dummy_con;
281 switch (m68k_machtype) {
307 #ifdef CONFIG_MVME147
312 #ifdef CONFIG_MVME16x
317 #ifdef CONFIG_BVME6000
337 #ifdef CONFIG_COLDFIRE
341 cf_mmu_context_init();
346 panic("No configuration setup");
351 #ifdef CONFIG_NATFEAT
356 #ifdef CONFIG_BLK_DEV_INITRD
357 if (m68k_ramdisk.size) {
358 memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);
359 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
360 initrd_end = initrd_start + m68k_ramdisk.size;
361 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
367 atari_stram_reserve_pages((void *)availmem);
375 #endif /* !CONFIG_SUN3 */
377 /* set ISA defs early as possible */
378 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
380 isa_type = ISA_TYPE_Q40;
383 #ifdef CONFIG_AMIGA_PCMCIA
384 if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
385 isa_type = ISA_TYPE_AG;
389 #ifdef CONFIG_ATARI_ROM_ISA
391 isa_type = ISA_TYPE_ENEC;
398 static int show_cpuinfo(struct seq_file *m, void *v)
400 const char *cpu, *mmu, *fpu;
401 unsigned long clockfreq, clockfactor;
403 #define LOOP_CYCLES_68020 (8)
404 #define LOOP_CYCLES_68030 (8)
405 #define LOOP_CYCLES_68040 (3)
406 #define LOOP_CYCLES_68060 (1)
407 #define LOOP_CYCLES_COLDFIRE (2)
411 clockfactor = LOOP_CYCLES_68020;
412 } else if (CPU_IS_030) {
414 clockfactor = LOOP_CYCLES_68030;
415 } else if (CPU_IS_040) {
417 clockfactor = LOOP_CYCLES_68040;
418 } else if (CPU_IS_060) {
420 clockfactor = LOOP_CYCLES_68060;
421 } else if (CPU_IS_COLDFIRE) {
423 clockfactor = LOOP_CYCLES_COLDFIRE;
429 #ifdef CONFIG_M68KFPU_EMU_ONLY
430 fpu = "none(soft float)";
432 if (m68k_fputype & FPU_68881)
434 else if (m68k_fputype & FPU_68882)
436 else if (m68k_fputype & FPU_68040)
438 else if (m68k_fputype & FPU_68060)
440 else if (m68k_fputype & FPU_SUNFPA)
442 else if (m68k_fputype & FPU_COLDFIRE)
448 if (m68k_mmutype & MMU_68851)
450 else if (m68k_mmutype & MMU_68030)
452 else if (m68k_mmutype & MMU_68040)
454 else if (m68k_mmutype & MMU_68060)
456 else if (m68k_mmutype & MMU_SUN3)
458 else if (m68k_mmutype & MMU_APOLLO)
460 else if (m68k_mmutype & MMU_COLDFIRE)
465 clockfreq = loops_per_jiffy * HZ * clockfactor;
467 seq_printf(m, "CPU:\t\t%s\n"
470 "Clocking:\t%lu.%1luMHz\n"
471 "BogoMips:\t%lu.%02lu\n"
472 "Calibration:\t%lu loops\n",
474 clockfreq/1000000,(clockfreq/100000)%10,
475 loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
480 static void *c_start(struct seq_file *m, loff_t *pos)
482 return *pos < 1 ? (void *)1 : NULL;
484 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
489 static void c_stop(struct seq_file *m, void *v)
492 const struct seq_operations cpuinfo_op = {
496 .show = show_cpuinfo,
499 #ifdef CONFIG_PROC_HARDWARE
500 static int hardware_proc_show(struct seq_file *m, void *v)
507 mach_get_model(model);
509 strcpy(model, "Unknown m68k");
511 seq_printf(m, "Model:\t\t%s\n", model);
512 for (mem = 0, i = 0; i < m68k_num_memory; i++)
513 mem += m68k_memory[i].size;
514 seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
516 if (mach_get_hardware_list)
517 mach_get_hardware_list(m);
522 static int __init proc_hardware_init(void)
524 proc_create_single("hardware", 0, NULL, hardware_proc_show);
527 module_init(proc_hardware_init);
530 void check_bugs(void)
532 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
533 if (m68k_fputype == 0) {
534 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
535 "WHICH IS REQUIRED BY LINUX/M68K ***\n");
536 pr_emerg("Upgrade your hardware or join the FPU "
537 "emulation project\n");
540 #endif /* !CONFIG_M68KFPU_EMU */
544 static int __init adb_probe_sync_enable (char *str) {
545 extern int __adb_probe_sync;
546 __adb_probe_sync = 1;
550 __setup("adb_sync", adb_probe_sync_enable);
551 #endif /* CONFIG_ADB */