setup.c

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/*
 *  linux/arch/h8300/kernel/setup.c
 *
 *  Copyleft  ()) 2000       James D. Schettine {[email protected]}
 *  Copyright (C) 1999,2000  Greg Ungerer ([email protected])
 *  Copyright (C) 1998,1999  D. Jeff Dionne <[email protected]>
 *  Copyright (C) 1998       Kenneth Albanowski <[email protected]>
 *  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 <[email protected]>
 */

/*
 * This file handles the architecture-dependent parts of system setup
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/mm.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>
#include <asm/pgtable.h>
#include <asm/sections.h>

#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 __initdata command_line[COMMAND_LINE_SIZE];

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 <[email protected]>\n");

#ifdef DEBUG
    printk(KERN_DEBUG "KERNEL -> TEXT=0x%p-0x%p DATA=0x%p-0x%p "
        "BSS=0x%p-0x%p\n", _stext, _etext, _sdata, _edata, __bss_start,
        __bss_stop);
    printk(KERN_DEBUG "KERNEL -> ROMFS=0x%p-0x%06lx MEM=0x%06lx-0x%06lx "
        "STACK=0x%06lx-0x%p\n", __bss_stop, memory_start, memory_start,
        memory_end, memory_end, &_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(boot_command_line, command_line, COMMAND_LINE_SIZE);
    boot_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, BOOTMEM_DEFAULT);
    /*
     * 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)
{
}

const struct seq_operations cpuinfo_op = {
    .start  = c_start,
    .next   = c_next,
    .stop   = c_stop,
    .show   = show_cpuinfo,
};