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