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>
13 #include <linux/cpu.h>
15 #include <linux/sched.h>
16 #include <linux/delay.h>
17 #include <linux/interrupt.h>
19 #include <linux/console.h>
20 #include <linux/genhd.h>
21 #include <linux/errno.h>
22 #include <linux/string.h>
23 #include <linux/init.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/nvram.h>
29 #include <linux/initrd.h>
31 #include <asm/bootinfo.h>
32 #include <asm/byteorder.h>
33 #include <asm/sections.h>
34 #include <asm/setup.h>
38 #include <asm/machdep.h>
40 #include <asm/amigahw.h>
42 #include <asm/atarihw.h>
44 #include <asm/atari_stram.h>
49 #include <asm/macintosh.h>
50 #include <asm/natfeat.h>
52 #if !FPSTATESIZE || !NR_IRQS
53 #warning No CPU/platform type selected, your kernel will not work!
54 #warning Are you building an allnoconfig kernel?
57 unsigned long m68k_machtype;
58 EXPORT_SYMBOL(m68k_machtype);
59 unsigned long m68k_cputype;
60 EXPORT_SYMBOL(m68k_cputype);
61 unsigned long m68k_fputype;
62 unsigned long m68k_mmutype;
63 EXPORT_SYMBOL(m68k_mmutype);
65 unsigned long vme_brdtype;
66 EXPORT_SYMBOL(vme_brdtype);
70 EXPORT_SYMBOL(m68k_is040or060);
72 extern unsigned long availmem;
75 EXPORT_SYMBOL(m68k_num_memory);
76 int m68k_realnum_memory;
77 EXPORT_SYMBOL(m68k_realnum_memory);
78 unsigned long m68k_memoffset;
79 struct m68k_mem_info m68k_memory[NUM_MEMINFO];
80 EXPORT_SYMBOL(m68k_memory);
82 static struct m68k_mem_info m68k_ramdisk __initdata;
84 static char m68k_command_line[CL_SIZE] __initdata;
86 void (*mach_sched_init) (irq_handler_t handler) __initdata = NULL;
87 /* machine dependent irq functions */
88 void (*mach_init_IRQ) (void) __initdata = NULL;
89 void (*mach_get_model) (char *model);
90 void (*mach_get_hardware_list) (struct seq_file *m);
91 /* machine dependent timer functions */
92 int (*mach_hwclk) (int, struct rtc_time*);
93 EXPORT_SYMBOL(mach_hwclk);
94 unsigned int (*mach_get_ss)(void);
95 int (*mach_get_rtc_pll)(struct rtc_pll_info *);
96 int (*mach_set_rtc_pll)(struct rtc_pll_info *);
97 EXPORT_SYMBOL(mach_get_ss);
98 EXPORT_SYMBOL(mach_get_rtc_pll);
99 EXPORT_SYMBOL(mach_set_rtc_pll);
100 void (*mach_reset)( void );
101 void (*mach_halt)( void );
102 void (*mach_power_off)( void );
103 long mach_max_dma_address = 0x00ffffff; /* default set to the lower 16MB */
104 #ifdef CONFIG_HEARTBEAT
105 void (*mach_heartbeat) (int);
106 EXPORT_SYMBOL(mach_heartbeat);
108 #ifdef CONFIG_M68K_L2_CACHE
109 void (*mach_l2_flush) (int);
111 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
114 EXPORT_SYMBOL(isa_type);
115 EXPORT_SYMBOL(isa_sex);
118 extern int amiga_parse_bootinfo(const struct bi_record *);
119 extern int atari_parse_bootinfo(const struct bi_record *);
120 extern int mac_parse_bootinfo(const struct bi_record *);
121 extern int q40_parse_bootinfo(const struct bi_record *);
122 extern int bvme6000_parse_bootinfo(const struct bi_record *);
123 extern int mvme16x_parse_bootinfo(const struct bi_record *);
124 extern int mvme147_parse_bootinfo(const struct bi_record *);
125 extern int hp300_parse_bootinfo(const struct bi_record *);
126 extern int apollo_parse_bootinfo(const struct bi_record *);
128 extern void config_amiga(void);
129 extern void config_atari(void);
130 extern void config_mac(void);
131 extern void config_sun3(void);
132 extern void config_apollo(void);
133 extern void config_mvme147(void);
134 extern void config_mvme16x(void);
135 extern void config_bvme6000(void);
136 extern void config_hp300(void);
137 extern void config_q40(void);
138 extern void config_sun3x(void);
140 #define MASK_256K 0xfffc0000
142 extern void paging_init(void);
144 static void __init m68k_parse_bootinfo(const struct bi_record *record)
148 save_bootinfo(record);
150 while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
152 const void *data = record->data;
153 uint16_t size = be16_to_cpu(record->size);
160 /* Already set up by head.S */
164 if (m68k_num_memory < NUM_MEMINFO) {
165 const struct mem_info *m = data;
166 m68k_memory[m68k_num_memory].addr =
167 be32_to_cpu(m->addr);
168 m68k_memory[m68k_num_memory].size =
169 be32_to_cpu(m->size);
172 pr_warn("%s: too many memory chunks\n",
178 const struct mem_info *m = data;
179 m68k_ramdisk.addr = be32_to_cpu(m->addr);
180 m68k_ramdisk.size = be32_to_cpu(m->size);
184 case BI_COMMAND_LINE:
185 strlcpy(m68k_command_line, data,
186 sizeof(m68k_command_line));
191 unknown = amiga_parse_bootinfo(record);
192 else if (MACH_IS_ATARI)
193 unknown = atari_parse_bootinfo(record);
194 else if (MACH_IS_MAC)
195 unknown = mac_parse_bootinfo(record);
196 else if (MACH_IS_Q40)
197 unknown = q40_parse_bootinfo(record);
198 else if (MACH_IS_BVME6000)
199 unknown = bvme6000_parse_bootinfo(record);
200 else if (MACH_IS_MVME16x)
201 unknown = mvme16x_parse_bootinfo(record);
202 else if (MACH_IS_MVME147)
203 unknown = mvme147_parse_bootinfo(record);
204 else if (MACH_IS_HP300)
205 unknown = hp300_parse_bootinfo(record);
206 else if (MACH_IS_APOLLO)
207 unknown = apollo_parse_bootinfo(record);
212 pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
214 record = (struct bi_record *)((unsigned long)record + size);
217 m68k_realnum_memory = m68k_num_memory;
218 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
219 if (m68k_num_memory > 1) {
220 pr_warn("%s: ignoring last %i chunks of physical memory\n",
221 __func__, (m68k_num_memory - 1));
227 void __init setup_arch(char **cmdline_p)
229 /* The bootinfo is located right after the kernel */
230 if (!CPU_IS_COLDFIRE)
231 m68k_parse_bootinfo((const struct bi_record *)_end);
238 /* FIXME: m68k_fputype is passed in by Penguin booter, which can
239 * be confused by software FPU emulation. BEWARE.
240 * We should really do our own FPU check at startup.
241 * [what do we do with buggy 68LC040s? if we have problems
242 * with them, we should add a test to check_bugs() below] */
243 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
244 /* clear the fpu if we have one */
245 if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
246 volatile int zero = 0;
247 asm volatile ("frestore %0" : : "m" (zero));
254 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
256 if (((pcr >> 8) & 0xff) <= 5) {
257 pr_warn("Enabling workaround for errata I14\n");
258 asm (".chip 68060; movec %0,%%pcr; .chip 68k"
259 : : "d" (pcr | 0x20));
263 init_mm.start_code = PAGE_OFFSET;
264 init_mm.end_code = (unsigned long)_etext;
265 init_mm.end_data = (unsigned long)_edata;
266 init_mm.brk = (unsigned long)_end;
268 #if defined(CONFIG_BOOTPARAM)
269 strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
270 m68k_command_line[CL_SIZE - 1] = 0;
271 #endif /* CONFIG_BOOTPARAM */
272 process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
273 *cmdline_p = m68k_command_line;
274 memcpy(boot_command_line, *cmdline_p, CL_SIZE);
278 #ifdef CONFIG_DUMMY_CONSOLE
279 conswitchp = &dummy_con;
282 switch (m68k_machtype) {
308 #ifdef CONFIG_MVME147
313 #ifdef CONFIG_MVME16x
318 #ifdef CONFIG_BVME6000
338 #ifdef CONFIG_COLDFIRE
342 cf_mmu_context_init();
347 panic("No configuration setup");
352 #ifdef CONFIG_NATFEAT
357 #ifdef CONFIG_BLK_DEV_INITRD
358 if (m68k_ramdisk.size) {
359 memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);
360 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
361 initrd_end = initrd_start + m68k_ramdisk.size;
362 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
368 atari_stram_reserve_pages((void *)availmem);
376 #endif /* !CONFIG_SUN3 */
378 /* set ISA defs early as possible */
379 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
381 isa_type = ISA_TYPE_Q40;
384 #ifdef CONFIG_AMIGA_PCMCIA
385 if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
386 isa_type = ISA_TYPE_AG;
390 #ifdef CONFIG_ATARI_ROM_ISA
392 isa_type = ISA_TYPE_ENEC;
399 static int show_cpuinfo(struct seq_file *m, void *v)
401 const char *cpu, *mmu, *fpu;
402 unsigned long clockfreq, clockfactor;
404 #define LOOP_CYCLES_68020 (8)
405 #define LOOP_CYCLES_68030 (8)
406 #define LOOP_CYCLES_68040 (3)
407 #define LOOP_CYCLES_68060 (1)
408 #define LOOP_CYCLES_COLDFIRE (2)
412 clockfactor = LOOP_CYCLES_68020;
413 } else if (CPU_IS_030) {
415 clockfactor = LOOP_CYCLES_68030;
416 } else if (CPU_IS_040) {
418 clockfactor = LOOP_CYCLES_68040;
419 } else if (CPU_IS_060) {
421 clockfactor = LOOP_CYCLES_68060;
422 } else if (CPU_IS_COLDFIRE) {
424 clockfactor = LOOP_CYCLES_COLDFIRE;
430 #ifdef CONFIG_M68KFPU_EMU_ONLY
431 fpu = "none(soft float)";
433 if (m68k_fputype & FPU_68881)
435 else if (m68k_fputype & FPU_68882)
437 else if (m68k_fputype & FPU_68040)
439 else if (m68k_fputype & FPU_68060)
441 else if (m68k_fputype & FPU_SUNFPA)
443 else if (m68k_fputype & FPU_COLDFIRE)
449 if (m68k_mmutype & MMU_68851)
451 else if (m68k_mmutype & MMU_68030)
453 else if (m68k_mmutype & MMU_68040)
455 else if (m68k_mmutype & MMU_68060)
457 else if (m68k_mmutype & MMU_SUN3)
459 else if (m68k_mmutype & MMU_APOLLO)
461 else if (m68k_mmutype & MMU_COLDFIRE)
466 clockfreq = loops_per_jiffy * HZ * clockfactor;
468 seq_printf(m, "CPU:\t\t%s\n"
471 "Clocking:\t%lu.%1luMHz\n"
472 "BogoMips:\t%lu.%02lu\n"
473 "Calibration:\t%lu loops\n",
475 clockfreq/1000000,(clockfreq/100000)%10,
476 loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
481 static void *c_start(struct seq_file *m, loff_t *pos)
483 return *pos < 1 ? (void *)1 : NULL;
485 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
490 static void c_stop(struct seq_file *m, void *v)
493 const struct seq_operations cpuinfo_op = {
497 .show = show_cpuinfo,
500 #ifdef CONFIG_PROC_HARDWARE
501 static int hardware_proc_show(struct seq_file *m, void *v)
508 mach_get_model(model);
510 strcpy(model, "Unknown m68k");
512 seq_printf(m, "Model:\t\t%s\n", model);
513 for (mem = 0, i = 0; i < m68k_num_memory; i++)
514 mem += m68k_memory[i].size;
515 seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
517 if (mach_get_hardware_list)
518 mach_get_hardware_list(m);
523 static int __init proc_hardware_init(void)
525 proc_create_single("hardware", 0, NULL, hardware_proc_show);
528 module_init(proc_hardware_init);
531 void __init arch_cpu_finalize_init(void)
533 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
534 if (m68k_fputype == 0) {
535 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
536 "WHICH IS REQUIRED BY LINUX/M68K ***\n");
537 pr_emerg("Upgrade your hardware or join the FPU "
538 "emulation project\n");
541 #endif /* !CONFIG_M68KFPU_EMU */
545 static int __init adb_probe_sync_enable (char *str) {
546 extern int __adb_probe_sync;
547 __adb_probe_sync = 1;
551 __setup("adb_sync", adb_probe_sync_enable);
552 #endif /* CONFIG_ADB */
554 #if IS_ENABLED(CONFIG_NVRAM)
556 static unsigned char m68k_nvram_read_byte(int addr)
559 return mac_pram_read_byte(addr);
563 static void m68k_nvram_write_byte(unsigned char val, int addr)
566 mac_pram_write_byte(val, addr);
568 #endif /* CONFIG_MAC */
571 static ssize_t m68k_nvram_read(char *buf, size_t count, loff_t *ppos)
574 return atari_nvram_read(buf, count, ppos);
575 else if (MACH_IS_MAC)
576 return nvram_read_bytes(buf, count, ppos);
580 static ssize_t m68k_nvram_write(char *buf, size_t count, loff_t *ppos)
583 return atari_nvram_write(buf, count, ppos);
584 else if (MACH_IS_MAC)
585 return nvram_write_bytes(buf, count, ppos);
589 static long m68k_nvram_set_checksum(void)
592 return atari_nvram_set_checksum();
596 static long m68k_nvram_initialize(void)
599 return atari_nvram_initialize();
602 #endif /* CONFIG_ATARI */
604 static ssize_t m68k_nvram_get_size(void)
607 return atari_nvram_get_size();
608 else if (MACH_IS_MAC)
609 return mac_pram_get_size();
613 /* Atari device drivers call .read (to get checksum validation) whereas
614 * Mac and PowerMac device drivers just use .read_byte.
616 const struct nvram_ops arch_nvram_ops = {
618 .read_byte = m68k_nvram_read_byte,
619 .write_byte = m68k_nvram_write_byte,
622 .read = m68k_nvram_read,
623 .write = m68k_nvram_write,
624 .set_checksum = m68k_nvram_set_checksum,
625 .initialize = m68k_nvram_initialize,
627 .get_size = m68k_nvram_get_size,
629 EXPORT_SYMBOL(arch_nvram_ops);
630 #endif /* CONFIG_NVRAM */