607 lines
14 KiB
C
607 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/m68k/kernel/setup.c
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*
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* Copyright (C) 1995 Hamish Macdonald
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*/
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/*
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* This file handles the architecture-dependent parts of system setup
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*/
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/fs.h>
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#include <linux/console.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/memblock.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/module.h>
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#include <linux/nvram.h>
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#include <linux/initrd.h>
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#include <linux/random.h>
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#include <asm/bootinfo.h>
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#include <asm/byteorder.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/fpu.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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#include <asm/machdep.h>
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#ifdef CONFIG_AMIGA
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#include <asm/amigahw.h>
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#endif
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#include <asm/atarihw.h>
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#ifdef CONFIG_ATARI
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#include <asm/atari_stram.h>
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#endif
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#ifdef CONFIG_SUN3X
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#include <asm/dvma.h>
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#endif
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#include <asm/macintosh.h>
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#include <asm/natfeat.h>
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#include <asm/config.h>
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#if !FPSTATESIZE || !NR_IRQS
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#warning No CPU/platform type selected, your kernel will not work!
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#warning Are you building an allnoconfig kernel?
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#endif
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unsigned long m68k_machtype;
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EXPORT_SYMBOL(m68k_machtype);
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unsigned long m68k_cputype;
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EXPORT_SYMBOL(m68k_cputype);
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unsigned long m68k_fputype;
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unsigned long m68k_mmutype;
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EXPORT_SYMBOL(m68k_mmutype);
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#ifdef CONFIG_VME
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unsigned long vme_brdtype;
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EXPORT_SYMBOL(vme_brdtype);
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#endif
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int m68k_is040or060;
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EXPORT_SYMBOL(m68k_is040or060);
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extern unsigned long availmem;
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int m68k_num_memory;
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EXPORT_SYMBOL(m68k_num_memory);
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int m68k_realnum_memory;
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EXPORT_SYMBOL(m68k_realnum_memory);
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unsigned long m68k_memoffset;
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struct m68k_mem_info m68k_memory[NUM_MEMINFO];
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EXPORT_SYMBOL(m68k_memory);
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static struct m68k_mem_info m68k_ramdisk __initdata;
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static char m68k_command_line[CL_SIZE] __initdata;
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void (*mach_sched_init) (void) __initdata = NULL;
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/* machine dependent irq functions */
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void (*mach_init_IRQ) (void) __initdata = NULL;
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void (*mach_get_model) (char *model);
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void (*mach_get_hardware_list) (struct seq_file *m);
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void (*mach_reset)( void );
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void (*mach_halt)( void );
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#ifdef CONFIG_HEARTBEAT
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void (*mach_heartbeat) (int);
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EXPORT_SYMBOL(mach_heartbeat);
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#endif
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#ifdef CONFIG_M68K_L2_CACHE
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void (*mach_l2_flush) (int);
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#endif
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#if defined(CONFIG_ISA) && defined(MULTI_ISA)
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int isa_type;
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int isa_sex;
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EXPORT_SYMBOL(isa_type);
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EXPORT_SYMBOL(isa_sex);
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#endif
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#define MASK_256K 0xfffc0000
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extern void paging_init(void);
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static void __init m68k_parse_bootinfo(const struct bi_record *record)
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{
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const struct bi_record *first_record = record;
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uint16_t tag;
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while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
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int unknown = 0;
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const void *data = record->data;
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uint16_t size = be16_to_cpu(record->size);
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switch (tag) {
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case BI_MACHTYPE:
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case BI_CPUTYPE:
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case BI_FPUTYPE:
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case BI_MMUTYPE:
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/* Already set up by head.S */
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break;
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case BI_MEMCHUNK:
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if (m68k_num_memory < NUM_MEMINFO) {
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const struct mem_info *m = data;
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m68k_memory[m68k_num_memory].addr =
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be32_to_cpu(m->addr);
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m68k_memory[m68k_num_memory].size =
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be32_to_cpu(m->size);
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m68k_num_memory++;
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} else
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pr_warn("%s: too many memory chunks\n",
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__func__);
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break;
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case BI_RAMDISK:
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{
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const struct mem_info *m = data;
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m68k_ramdisk.addr = be32_to_cpu(m->addr);
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m68k_ramdisk.size = be32_to_cpu(m->size);
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}
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break;
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case BI_COMMAND_LINE:
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strscpy(m68k_command_line, data,
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sizeof(m68k_command_line));
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break;
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case BI_RNG_SEED: {
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u16 len = be16_to_cpup(data);
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add_bootloader_randomness(data + 2, len);
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/*
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* Zero the data to preserve forward secrecy, and zero the
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* length to prevent kexec from using it.
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*/
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memzero_explicit((void *)data, len + 2);
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break;
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}
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default:
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if (MACH_IS_AMIGA)
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unknown = amiga_parse_bootinfo(record);
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else if (MACH_IS_ATARI)
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unknown = atari_parse_bootinfo(record);
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else if (MACH_IS_MAC)
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unknown = mac_parse_bootinfo(record);
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else if (MACH_IS_Q40)
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unknown = q40_parse_bootinfo(record);
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else if (MACH_IS_BVME6000)
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unknown = bvme6000_parse_bootinfo(record);
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else if (MACH_IS_MVME16x)
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unknown = mvme16x_parse_bootinfo(record);
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else if (MACH_IS_MVME147)
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unknown = mvme147_parse_bootinfo(record);
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else if (MACH_IS_HP300)
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unknown = hp300_parse_bootinfo(record);
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else if (MACH_IS_APOLLO)
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unknown = apollo_parse_bootinfo(record);
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else if (MACH_IS_VIRT)
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unknown = virt_parse_bootinfo(record);
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else
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unknown = 1;
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}
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if (unknown)
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pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
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tag);
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record = (struct bi_record *)((unsigned long)record + size);
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}
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save_bootinfo(first_record);
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m68k_realnum_memory = m68k_num_memory;
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#ifdef CONFIG_SINGLE_MEMORY_CHUNK
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if (m68k_num_memory > 1) {
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pr_warn("%s: ignoring last %i chunks of physical memory\n",
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__func__, (m68k_num_memory - 1));
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m68k_num_memory = 1;
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}
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#endif
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}
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void __init setup_arch(char **cmdline_p)
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{
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/* The bootinfo is located right after the kernel */
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if (!CPU_IS_COLDFIRE)
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m68k_parse_bootinfo((const struct bi_record *)_end);
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if (CPU_IS_040)
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m68k_is040or060 = 4;
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else if (CPU_IS_060)
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m68k_is040or060 = 6;
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/* FIXME: m68k_fputype is passed in by Penguin booter, which can
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* be confused by software FPU emulation. BEWARE.
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* We should really do our own FPU check at startup.
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* [what do we do with buggy 68LC040s? if we have problems
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* with them, we should add a test to check_bugs() below] */
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#if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
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/* clear the fpu if we have one */
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if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
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volatile int zero = 0;
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asm volatile ("frestore %0" : : "m" (zero));
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}
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#endif
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if (CPU_IS_060) {
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u32 pcr;
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asm (".chip 68060; movec %%pcr,%0; .chip 68k"
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: "=d" (pcr));
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if (((pcr >> 8) & 0xff) <= 5) {
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pr_warn("Enabling workaround for errata I14\n");
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asm (".chip 68060; movec %0,%%pcr; .chip 68k"
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: : "d" (pcr | 0x20));
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}
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}
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setup_initial_init_mm((void *)PAGE_OFFSET, _etext, _edata, _end);
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#if defined(CONFIG_BOOTPARAM)
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strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
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m68k_command_line[CL_SIZE - 1] = 0;
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#endif /* CONFIG_BOOTPARAM */
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process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
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*cmdline_p = m68k_command_line;
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memcpy(boot_command_line, *cmdline_p, CL_SIZE);
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parse_early_param();
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switch (m68k_machtype) {
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#ifdef CONFIG_AMIGA
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case MACH_AMIGA:
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config_amiga();
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break;
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#endif
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#ifdef CONFIG_ATARI
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case MACH_ATARI:
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config_atari();
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break;
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#endif
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#ifdef CONFIG_MAC
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case MACH_MAC:
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config_mac();
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break;
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#endif
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#ifdef CONFIG_SUN3
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case MACH_SUN3:
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config_sun3();
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break;
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#endif
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#ifdef CONFIG_APOLLO
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case MACH_APOLLO:
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config_apollo();
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break;
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#endif
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#ifdef CONFIG_MVME147
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case MACH_MVME147:
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config_mvme147();
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break;
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#endif
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#ifdef CONFIG_MVME16x
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case MACH_MVME16x:
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config_mvme16x();
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break;
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#endif
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#ifdef CONFIG_BVME6000
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case MACH_BVME6000:
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config_bvme6000();
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break;
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#endif
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#ifdef CONFIG_HP300
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case MACH_HP300:
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config_hp300();
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break;
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#endif
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#ifdef CONFIG_Q40
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case MACH_Q40:
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config_q40();
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break;
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#endif
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#ifdef CONFIG_SUN3X
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case MACH_SUN3X:
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config_sun3x();
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break;
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#endif
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#ifdef CONFIG_COLDFIRE
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case MACH_M54XX:
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case MACH_M5441X:
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cf_bootmem_alloc();
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cf_mmu_context_init();
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config_BSP(NULL, 0);
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break;
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#endif
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#ifdef CONFIG_VIRT
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case MACH_VIRT:
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config_virt();
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break;
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#endif
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default:
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panic("No configuration setup");
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}
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if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && m68k_ramdisk.size)
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memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);
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paging_init();
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if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && m68k_ramdisk.size) {
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initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
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initrd_end = initrd_start + m68k_ramdisk.size;
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pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
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}
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#ifdef CONFIG_NATFEAT
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nf_init();
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#endif
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#ifdef CONFIG_ATARI
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if (MACH_IS_ATARI)
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atari_stram_reserve_pages((void *)availmem);
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#endif
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#ifdef CONFIG_SUN3X
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if (MACH_IS_SUN3X) {
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dvma_init();
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}
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#endif
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/* set ISA defs early as possible */
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#if defined(CONFIG_ISA) && defined(MULTI_ISA)
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if (MACH_IS_Q40) {
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isa_type = ISA_TYPE_Q40;
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isa_sex = 0;
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}
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#ifdef CONFIG_AMIGA_PCMCIA
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if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
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isa_type = ISA_TYPE_AG;
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isa_sex = 1;
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}
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#endif
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#ifdef CONFIG_ATARI_ROM_ISA
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if (MACH_IS_ATARI) {
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isa_type = ISA_TYPE_ENEC;
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isa_sex = 0;
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}
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#endif
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#endif
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}
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static int show_cpuinfo(struct seq_file *m, void *v)
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{
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const char *cpu, *mmu, *fpu;
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unsigned long clockfreq, clockfactor;
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#define LOOP_CYCLES_68020 (8)
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#define LOOP_CYCLES_68030 (8)
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#define LOOP_CYCLES_68040 (3)
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#define LOOP_CYCLES_68060 (1)
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#define LOOP_CYCLES_COLDFIRE (2)
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if (CPU_IS_020) {
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cpu = "68020";
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clockfactor = LOOP_CYCLES_68020;
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} else if (CPU_IS_030) {
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cpu = "68030";
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clockfactor = LOOP_CYCLES_68030;
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} else if (CPU_IS_040) {
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cpu = "68040";
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clockfactor = LOOP_CYCLES_68040;
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} else if (CPU_IS_060) {
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cpu = "68060";
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clockfactor = LOOP_CYCLES_68060;
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} else if (CPU_IS_COLDFIRE) {
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cpu = "ColdFire";
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clockfactor = LOOP_CYCLES_COLDFIRE;
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} else {
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cpu = "680x0";
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clockfactor = 0;
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}
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#ifdef CONFIG_M68KFPU_EMU_ONLY
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fpu = "none(soft float)";
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#else
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if (m68k_fputype & FPU_68881)
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fpu = "68881";
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else if (m68k_fputype & FPU_68882)
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fpu = "68882";
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else if (m68k_fputype & FPU_68040)
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fpu = "68040";
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else if (m68k_fputype & FPU_68060)
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fpu = "68060";
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else if (m68k_fputype & FPU_SUNFPA)
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fpu = "Sun FPA";
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else if (m68k_fputype & FPU_COLDFIRE)
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fpu = "ColdFire";
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else
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fpu = "none";
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#endif
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if (m68k_mmutype & MMU_68851)
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mmu = "68851";
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else if (m68k_mmutype & MMU_68030)
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mmu = "68030";
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else if (m68k_mmutype & MMU_68040)
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mmu = "68040";
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else if (m68k_mmutype & MMU_68060)
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mmu = "68060";
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else if (m68k_mmutype & MMU_SUN3)
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mmu = "Sun-3";
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else if (m68k_mmutype & MMU_APOLLO)
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mmu = "Apollo";
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else if (m68k_mmutype & MMU_COLDFIRE)
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mmu = "ColdFire";
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else
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mmu = "unknown";
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clockfreq = loops_per_jiffy * HZ * clockfactor;
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seq_printf(m, "CPU:\t\t%s\n"
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"MMU:\t\t%s\n"
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"FPU:\t\t%s\n"
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"Clocking:\t%lu.%1luMHz\n"
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"BogoMips:\t%lu.%02lu\n"
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"Calibration:\t%lu loops\n",
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cpu, mmu, fpu,
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clockfreq/1000000,(clockfreq/100000)%10,
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loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
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loops_per_jiffy);
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return 0;
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}
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static void *c_start(struct seq_file *m, loff_t *pos)
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{
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return *pos < 1 ? (void *)1 : NULL;
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}
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static void *c_next(struct seq_file *m, void *v, loff_t *pos)
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{
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++*pos;
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return NULL;
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}
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static void c_stop(struct seq_file *m, void *v)
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{
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}
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const struct seq_operations cpuinfo_op = {
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.start = c_start,
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.next = c_next,
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.stop = c_stop,
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.show = show_cpuinfo,
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};
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#ifdef CONFIG_PROC_HARDWARE
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static int hardware_proc_show(struct seq_file *m, void *v)
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{
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char model[80];
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unsigned long mem;
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int i;
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if (mach_get_model)
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mach_get_model(model);
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else
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strcpy(model, "Unknown m68k");
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seq_printf(m, "Model:\t\t%s\n", model);
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for (mem = 0, i = 0; i < m68k_num_memory; i++)
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mem += m68k_memory[i].size;
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seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
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if (mach_get_hardware_list)
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mach_get_hardware_list(m);
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return 0;
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}
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static int __init proc_hardware_init(void)
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{
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proc_create_single("hardware", 0, NULL, hardware_proc_show);
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return 0;
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}
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module_init(proc_hardware_init);
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#endif
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void check_bugs(void)
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{
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#if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
|
|
if (m68k_fputype == 0) {
|
|
pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
|
|
"WHICH IS REQUIRED BY LINUX/M68K ***\n");
|
|
pr_emerg("Upgrade your hardware or join the FPU "
|
|
"emulation project\n");
|
|
panic("no FPU");
|
|
}
|
|
#endif /* !CONFIG_M68KFPU_EMU */
|
|
}
|
|
|
|
#ifdef CONFIG_ADB
|
|
static int __init adb_probe_sync_enable (char *str) {
|
|
extern int __adb_probe_sync;
|
|
__adb_probe_sync = 1;
|
|
return 1;
|
|
}
|
|
|
|
__setup("adb_sync", adb_probe_sync_enable);
|
|
#endif /* CONFIG_ADB */
|
|
|
|
#if IS_ENABLED(CONFIG_NVRAM)
|
|
#ifdef CONFIG_MAC
|
|
static unsigned char m68k_nvram_read_byte(int addr)
|
|
{
|
|
if (MACH_IS_MAC)
|
|
return mac_pram_read_byte(addr);
|
|
return 0xff;
|
|
}
|
|
|
|
static void m68k_nvram_write_byte(unsigned char val, int addr)
|
|
{
|
|
if (MACH_IS_MAC)
|
|
mac_pram_write_byte(val, addr);
|
|
}
|
|
#endif /* CONFIG_MAC */
|
|
|
|
#ifdef CONFIG_ATARI
|
|
static ssize_t m68k_nvram_read(char *buf, size_t count, loff_t *ppos)
|
|
{
|
|
if (MACH_IS_ATARI)
|
|
return atari_nvram_read(buf, count, ppos);
|
|
else if (MACH_IS_MAC)
|
|
return nvram_read_bytes(buf, count, ppos);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static ssize_t m68k_nvram_write(char *buf, size_t count, loff_t *ppos)
|
|
{
|
|
if (MACH_IS_ATARI)
|
|
return atari_nvram_write(buf, count, ppos);
|
|
else if (MACH_IS_MAC)
|
|
return nvram_write_bytes(buf, count, ppos);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static long m68k_nvram_set_checksum(void)
|
|
{
|
|
if (MACH_IS_ATARI)
|
|
return atari_nvram_set_checksum();
|
|
return -EINVAL;
|
|
}
|
|
|
|
static long m68k_nvram_initialize(void)
|
|
{
|
|
if (MACH_IS_ATARI)
|
|
return atari_nvram_initialize();
|
|
return -EINVAL;
|
|
}
|
|
#endif /* CONFIG_ATARI */
|
|
|
|
static ssize_t m68k_nvram_get_size(void)
|
|
{
|
|
if (MACH_IS_ATARI)
|
|
return atari_nvram_get_size();
|
|
else if (MACH_IS_MAC)
|
|
return mac_pram_get_size();
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Atari device drivers call .read (to get checksum validation) whereas
|
|
* Mac and PowerMac device drivers just use .read_byte.
|
|
*/
|
|
const struct nvram_ops arch_nvram_ops = {
|
|
#ifdef CONFIG_MAC
|
|
.read_byte = m68k_nvram_read_byte,
|
|
.write_byte = m68k_nvram_write_byte,
|
|
#endif
|
|
#ifdef CONFIG_ATARI
|
|
.read = m68k_nvram_read,
|
|
.write = m68k_nvram_write,
|
|
.set_checksum = m68k_nvram_set_checksum,
|
|
.initialize = m68k_nvram_initialize,
|
|
#endif
|
|
.get_size = m68k_nvram_get_size,
|
|
};
|
|
EXPORT_SYMBOL(arch_nvram_ops);
|
|
#endif /* CONFIG_NVRAM */
|