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linux/arch/m68k/kernel/setup_mm.c
Greg Ungerer 0a2796da11 m68k: add ColdFire FPU support for the V4e ColdFire CPUs 
The V4e ColdFire CPU family also has an integrated FPU (as well as the MMU).
So add code to support this hardware along side the existing m68k FPU code.

The ColdFire FPU is of course different to all previous 68k FP units. It is
close in operation to the 68060, but not completely compatible. The biggest
issue to deal with is that the ColdFire FPU multi-move instructions are
different. It does not support multi-moving the FP control registers, and
the multi-move of the FP data registers uses a different instruction
mnemonic.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Acked-by: Matt Waddel <mwaddel@yahoo.com>
Acked-by: Kurt Mahan <kmahan@xmission.com>
2011-12-30 10:20:47 +10:00

554 lines
13 KiB
C
Raw Blame History

/*
* 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/mm.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/console.h>
#include <linux/genhd.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/module.h>
#include <linux/initrd.h>
#include <asm/bootinfo.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
#ifdef CONFIG_ATARI
#include <asm/atarihw.h>
#include <asm/atari_stram.h>
#endif
#ifdef CONFIG_SUN3X
#include <asm/dvma.h>
#endif
#include <asm/natfeat.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 mem_info m68k_memory[NUM_MEMINFO];
EXPORT_SYMBOL(m68k_memory);
struct mem_info m68k_ramdisk;
static char m68k_command_line[CL_SIZE];
void (*mach_sched_init) (irq_handler_t handler) __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);
/* machine dependent timer functions */
unsigned long (*mach_gettimeoffset) (void);
int (*mach_hwclk) (int, struct rtc_time*);
EXPORT_SYMBOL(mach_hwclk);
int (*mach_set_clock_mmss) (unsigned long);
unsigned int (*mach_get_ss)(void);
int (*mach_get_rtc_pll)(struct rtc_pll_info *);
int (*mach_set_rtc_pll)(struct rtc_pll_info *);
EXPORT_SYMBOL(mach_get_ss);
EXPORT_SYMBOL(mach_get_rtc_pll);
EXPORT_SYMBOL(mach_set_rtc_pll);
void (*mach_reset)( void );
void (*mach_halt)( void );
void (*mach_power_off)( void );
long mach_max_dma_address = 0x00ffffff; /* default set to the lower 16MB */
#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_INPUT_M68K_BEEP) || defined(CONFIG_INPUT_M68K_BEEP_MODULE)
void (*mach_beep)(unsigned int, unsigned int);
EXPORT_SYMBOL(mach_beep);
#endif
#if defined(CONFIG_ISA) && defined(MULTI_ISA)
int isa_type;
int isa_sex;
EXPORT_SYMBOL(isa_type);
EXPORT_SYMBOL(isa_sex);
#endif
extern int amiga_parse_bootinfo(const struct bi_record *);
extern int atari_parse_bootinfo(const struct bi_record *);
extern int mac_parse_bootinfo(const struct bi_record *);
extern int q40_parse_bootinfo(const struct bi_record *);
extern int bvme6000_parse_bootinfo(const struct bi_record *);
extern int mvme16x_parse_bootinfo(const struct bi_record *);
extern int mvme147_parse_bootinfo(const struct bi_record *);
extern int hp300_parse_bootinfo(const struct bi_record *);
extern int apollo_parse_bootinfo(const struct bi_record *);
extern void config_amiga(void);
extern void config_atari(void);
extern void config_mac(void);
extern void config_sun3(void);
extern void config_apollo(void);
extern void config_mvme147(void);
extern void config_mvme16x(void);
extern void config_bvme6000(void);
extern void config_hp300(void);
extern void config_q40(void);
extern void config_sun3x(void);
#define MASK_256K 0xfffc0000
extern void paging_init(void);
static void __init m68k_parse_bootinfo(const struct bi_record *record)
{
while (record->tag != BI_LAST) {
int unknown = 0;
const unsigned long *data = record->data;
switch (record->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) {
m68k_memory[m68k_num_memory].addr = data[0];
m68k_memory[m68k_num_memory].size = data[1];
m68k_num_memory++;
} else
printk("m68k_parse_bootinfo: too many memory chunks\n");
break;
case BI_RAMDISK:
m68k_ramdisk.addr = data[0];
m68k_ramdisk.size = data[1];
break;
case BI_COMMAND_LINE:
strlcpy(m68k_command_line, (const char *)data,
sizeof(m68k_command_line));
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
unknown = 1;
}
if (unknown)
printk("m68k_parse_bootinfo: unknown tag 0x%04x ignored\n",
record->tag);
record = (struct bi_record *)((unsigned long)record +
record->size);
}
m68k_realnum_memory = m68k_num_memory;
#ifdef CONFIG_SINGLE_MEMORY_CHUNK
if (m68k_num_memory > 1) {
printk("Ignoring last %i chunks of physical memory\n",
(m68k_num_memory - 1));
m68k_num_memory = 1;
}
#endif
}
void __init setup_arch(char **cmdline_p)
{
#ifndef CONFIG_SUN3
int i;
#endif
/* The bootinfo is located right after the kernel bss */
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] */
#ifndef 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) {
printk("Enabling workaround for errata I14\n");
asm (".chip 68060; movec %0,%%pcr; .chip 68k"
: : "d" (pcr | 0x20));
}
}
init_mm.start_code = PAGE_OFFSET;
init_mm.end_code = (unsigned long)_etext;
init_mm.end_data = (unsigned long)_edata;
init_mm.brk = (unsigned long)_end;
#if defined(CONFIG_BOOTPARAM)
strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
m68k_command_line[CL_SIZE - 1] = 0;
#endif /* CONFIG_BOOTPARAM */
*cmdline_p = m68k_command_line;
memcpy(boot_command_line, *cmdline_p, CL_SIZE);
parse_early_param();
#ifdef CONFIG_DUMMY_CONSOLE
conswitchp = &dummy_con;
#endif
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:
config_BSP(NULL, 0);
break;
#endif
default:
panic("No configuration setup");
}
#ifdef CONFIG_NATFEAT
nf_init();
#endif
paging_init();
#ifndef CONFIG_SUN3
for (i = 1; i < m68k_num_memory; i++)
free_bootmem_node(NODE_DATA(i), m68k_memory[i].addr,
m68k_memory[i].size);
#ifdef CONFIG_BLK_DEV_INITRD
if (m68k_ramdisk.size) {
reserve_bootmem_node(__virt_to_node(phys_to_virt(m68k_ramdisk.addr)),
m68k_ramdisk.addr, m68k_ramdisk.size,
BOOTMEM_DEFAULT);
initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
initrd_end = initrd_start + m68k_ramdisk.size;
printk("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
}
#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
#endif /* !CONFIG_SUN3 */
/* 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
#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 hardware_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, hardware_proc_show, NULL);
}
static const struct file_operations hardware_proc_fops = {
.open = hardware_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __init proc_hardware_init(void)
{
proc_create("hardware", 0, NULL, &hardware_proc_fops);
return 0;
}
module_init(proc_hardware_init);
#endif
void check_bugs(void)
{
#ifndef CONFIG_M68KFPU_EMU
if (m68k_fputype == 0) {
printk(KERN_EMERG "*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
"WHICH IS REQUIRED BY LINUX/M68K ***\n");
printk(KERN_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 */
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