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linux-sg2042/arch/h8300/kernel/setup.c

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/*
* linux/arch/h8300/kernel/setup.c
*
* Copyleft ()) 2000 James D. Schettine {james@telos-systems.com}
* Copyright (C) 1999,2000 Greg Ungerer (gerg@snapgear.com)
* Copyright (C) 1998,1999 D. Jeff Dionne <jeff@lineo.ca>
* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
* Copyright (C) 1995 Hamish Macdonald
* Copyright (C) 2000 Lineo Inc. (www.lineo.com)
* Copyright (C) 2001 Lineo, Inc. <www.lineo.com>
*
* H8/300 porting Yoshinori Sato <ysato@users.sourceforge.jp>
*/
/*
* This file handles the architecture-dependent parts of system setup
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/fb.h>
#include <linux/console.h>
#include <linux/genhd.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/major.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <asm/setup.h>
#include <asm/irq.h>
#ifdef CONFIG_BLK_DEV_INITRD
#include <asm/pgtable.h>
#endif
#if defined(__H8300H__)
#define CPU "H8/300H"
#include <asm/regs306x.h>
#endif
#if defined(__H8300S__)
#define CPU "H8S"
#include <asm/regs267x.h>
#endif
#define STUBSIZE 0xc000;
unsigned long rom_length;
unsigned long memory_start;
unsigned long memory_end;
char command_line[COMMAND_LINE_SIZE];
extern int _stext, _etext, _sdata, _edata, _sbss, _ebss, _end;
extern int _ramstart, _ramend;
extern char _target_name[];
extern void h8300_gpio_init(void);
#if (defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)) \
&& defined(CONFIG_GDB_MAGICPRINT)
/* printk with gdb service */
static void gdb_console_output(struct console *c, const char *msg, unsigned len)
{
for (; len > 0; len--) {
asm("mov.w %0,r2\n\t"
"jsr @0xc4"::"r"(*msg++):"er2");
}
}
/*
* Setup initial baud/bits/parity. We do two things here:
* - construct a cflag setting for the first rs_open()
* - initialize the serial port
* Return non-zero if we didn't find a serial port.
*/
static int __init gdb_console_setup(struct console *co, char *options)
{
return 0;
}
static const struct console gdb_console = {
.name = "gdb_con",
.write = gdb_console_output,
.device = NULL,
.setup = gdb_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
};
#endif
void __init setup_arch(char **cmdline_p)
{
int bootmap_size;
memory_start = (unsigned long) &_ramstart;
/* allow for ROMFS on the end of the kernel */
if (memcmp((void *)memory_start, "-rom1fs-", 8) == 0) {
#if defined(CONFIG_BLK_DEV_INITRD)
initrd_start = memory_start;
initrd_end = memory_start += be32_to_cpu(((unsigned long *) (memory_start))[2]);
#else
memory_start += be32_to_cpu(((unsigned long *) memory_start)[2]);
#endif
}
memory_start = PAGE_ALIGN(memory_start);
#if !defined(CONFIG_BLKDEV_RESERVE)
memory_end = (unsigned long) &_ramend; /* by now the stack is part of the init task */
#if defined(CONFIG_GDB_DEBUG)
memory_end -= STUBSIZE;
#endif
#else
if ((memory_end < CONFIG_BLKDEV_RESERVE_ADDRESS) &&
(memory_end > CONFIG_BLKDEV_RESERVE_ADDRESS)
/* overlap userarea */
memory_end = CONFIG_BLKDEV_RESERVE_ADDRESS;
#endif
init_mm.start_code = (unsigned long) &_stext;
init_mm.end_code = (unsigned long) &_etext;
init_mm.end_data = (unsigned long) &_edata;
init_mm.brk = (unsigned long) 0;
#if (defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)) && defined(CONFIG_GDB_MAGICPRINT)
register_console((struct console *)&gdb_console);
#endif
printk(KERN_INFO "\r\n\nuClinux " CPU "\n");
printk(KERN_INFO "Target Hardware: %s\n",_target_name);
printk(KERN_INFO "Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
printk(KERN_INFO "H8/300 series support by Yoshinori Sato <ysato@users.sourceforge.jp>\n");
#ifdef DEBUG
printk(KERN_DEBUG "KERNEL -> TEXT=0x%06x-0x%06x DATA=0x%06x-0x%06x "
"BSS=0x%06x-0x%06x\n", (int) &_stext, (int) &_etext,
(int) &_sdata, (int) &_edata,
(int) &_sbss, (int) &_ebss);
printk(KERN_DEBUG "KERNEL -> ROMFS=0x%06x-0x%06x MEM=0x%06x-0x%06x "
"STACK=0x%06x-0x%06x\n",
(int) &_ebss, (int) memory_start,
(int) memory_start, (int) memory_end,
(int) memory_end, (int) &_ramend);
#endif
#ifdef CONFIG_DEFAULT_CMDLINE
/* set from default command line */
if (*command_line == '\0')
strcpy(command_line,CONFIG_KERNEL_COMMAND);
#endif
/* Keep a copy of command line */
*cmdline_p = &command_line[0];
memcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
saved_command_line[COMMAND_LINE_SIZE-1] = 0;
#ifdef DEBUG
if (strlen(*cmdline_p))
printk(KERN_DEBUG "Command line: '%s'\n", *cmdline_p);
#endif
/*
* give all the memory to the bootmap allocator, tell it to put the
* boot mem_map at the start of memory
*/
bootmap_size = init_bootmem_node(
NODE_DATA(0),
memory_start >> PAGE_SHIFT, /* map goes here */
PAGE_OFFSET >> PAGE_SHIFT, /* 0 on coldfire */
memory_end >> PAGE_SHIFT);
/*
* free the usable memory, we have to make sure we do not free
* the bootmem bitmap so we then reserve it after freeing it :-)
*/
free_bootmem(memory_start, memory_end - memory_start);
reserve_bootmem(memory_start, bootmap_size);
/*
* get kmalloc into gear
*/
paging_init();
h8300_gpio_init();
#if defined(CONFIG_H8300_AKI3068NET) && defined(CONFIG_IDE)
{
#define AREABIT(addr) (1 << (((addr) >> 21) & 7))
/* setup BSC */
volatile unsigned char *abwcr = (volatile unsigned char *)ABWCR;
volatile unsigned char *cscr = (volatile unsigned char *)CSCR;
*abwcr &= ~(AREABIT(CONFIG_H8300_IDE_BASE) | AREABIT(CONFIG_H8300_IDE_ALT));
*cscr |= (AREABIT(CONFIG_H8300_IDE_BASE) | AREABIT(CONFIG_H8300_IDE_ALT)) | 0x0f;
}
#endif
#ifdef DEBUG
printk(KERN_DEBUG "Done setup_arch\n");
#endif
}
/*
* Get CPU information for use by the procfs.
*/
static int show_cpuinfo(struct seq_file *m, void *v)
{
char *cpu;
int mode;
u_long clockfreq;
cpu = CPU;
mode = *(volatile unsigned char *)MDCR & 0x07;
clockfreq = CONFIG_CPU_CLOCK;
seq_printf(m, "CPU:\t\t%s (mode:%d)\n"
"Clock:\t\t%lu.%1luMHz\n"
"BogoMips:\t%lu.%02lu\n"
"Calibration:\t%lu loops\n",
cpu,mode,
clockfreq/1000,clockfreq%1000,
(loops_per_jiffy*HZ)/500000,((loops_per_jiffy*HZ)/5000)%100,
(loops_per_jiffy*HZ));
return 0;
}
static void *c_start(struct seq_file *m, loff_t *pos)
{
return *pos < NR_CPUS ? ((void *) 0x12345678) : NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
++*pos;
return c_start(m, pos);
}
static void c_stop(struct seq_file *m, void *v)
{
}
struct seq_operations cpuinfo_op = {
.start = c_start,
.next = c_next,
.stop = c_stop,
.show = show_cpuinfo,
};
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