LXR linux/arch/h8300/kernel/setup.c

   1/*
   2 *  linux/arch/h8300/kernel/setup.c
   3 *
   4 *  Copyleft  ()) 2000       James D. Schettine {james@telos-systems.com}
   5 *  Copyright (C) 1999,2000  Greg Ungerer (gerg@snapgear.com)
   6 *  Copyright (C) 1998,1999  D. Jeff Dionne <jeff@lineo.ca>
   7 *  Copyright (C) 1998       Kenneth Albanowski <kjahds@kjahds.com>
   8 *  Copyright (C) 1995       Hamish Macdonald
   9 *  Copyright (C) 2000       Lineo Inc. (www.lineo.com) 
  10 *  Copyright (C) 2001       Lineo, Inc. <www.lineo.com>
  11 *
  12 *  H8/300 porting Yoshinori Sato <ysato@users.sourceforge.jp>
  13 */
  14
  15/*
  16 * This file handles the architecture-dependent parts of system setup
  17 */
  18
  19#include <linux/kernel.h>
  20#include <linux/sched.h>
  21#include <linux/delay.h>
  22#include <linux/interrupt.h>
  23#include <linux/fs.h>
  24#include <linux/fb.h>
  25#include <linux/console.h>
  26#include <linux/genhd.h>
  27#include <linux/errno.h>
  28#include <linux/string.h>
  29#include <linux/major.h>
  30#include <linux/bootmem.h>
  31#include <linux/seq_file.h>
  32#include <linux/init.h>
  33
  34#include <asm/setup.h>
  35#include <asm/irq.h>
  36#include <asm/pgtable.h>
  37
  38#if defined(__H8300H__)
  39#define CPU "H8/300H"
  40#include <asm/regs306x.h>
  41#endif
  42
  43#if defined(__H8300S__)
  44#define CPU "H8S"
  45#include <asm/regs267x.h>
  46#endif
  47
  48#define STUBSIZE 0xc000;
  49
  50unsigned long rom_length;
  51unsigned long memory_start;
  52unsigned long memory_end;
  53
  54char __initdata command_line[COMMAND_LINE_SIZE];
  55
  56extern int _stext, _etext, _sdata, _edata, _sbss, _ebss, _end;
  57extern int _ramstart, _ramend;
  58extern char _target_name[];
  59extern void h8300_gpio_init(void);
  60
  61#if (defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)) \
  62    && defined(CONFIG_GDB_MAGICPRINT)
  63/* printk with gdb service */
  64static void gdb_console_output(struct console *c, const char *msg, unsigned len)
  65{
  66        for (; len > 0; len--) {
  67                asm("mov.w %0,r2\n\t"
  68                    "jsr @0xc4"::"r"(*msg++):"er2");
  69        }
  70}
  71
  72/*
  73 *      Setup initial baud/bits/parity. We do two things here:
  74 *      - construct a cflag setting for the first rs_open()
  75 *      - initialize the serial port
  76 *      Return non-zero if we didn't find a serial port.
  77 */
  78static int __init gdb_console_setup(struct console *co, char *options)
  79{
  80        return 0;
  81}
  82
  83static const struct console gdb_console = {
  84        .name           = "gdb_con",
  85        .write          = gdb_console_output,
  86        .device         = NULL,
  87        .setup          = gdb_console_setup,
  88        .flags          = CON_PRINTBUFFER,
  89        .index          = -1,
  90};
  91#endif
  92
  93void __init setup_arch(char **cmdline_p)
  94{
  95        int bootmap_size;
  96
  97        memory_start = (unsigned long) &_ramstart;
  98
  99        /* allow for ROMFS on the end of the kernel */
 100        if (memcmp((void *)memory_start, "-rom1fs-", 8) == 0) {
 101#if defined(CONFIG_BLK_DEV_INITRD)
 102                initrd_start = memory_start;
 103                initrd_end = memory_start += be32_to_cpu(((unsigned long *) (memory_start))[2]);
 104#else
 105                memory_start += be32_to_cpu(((unsigned long *) memory_start)[2]);
 106#endif
 107        }
 108        memory_start = PAGE_ALIGN(memory_start);
 109#if !defined(CONFIG_BLKDEV_RESERVE)
 110        memory_end = (unsigned long) &_ramend; /* by now the stack is part of the init task */
 111#if defined(CONFIG_GDB_DEBUG)
 112        memory_end -= STUBSIZE;
 113#endif
 114#else
 115        if ((memory_end < CONFIG_BLKDEV_RESERVE_ADDRESS) && 
 116            (memory_end > CONFIG_BLKDEV_RESERVE_ADDRESS))
 117            /* overlap userarea */
 118            memory_end = CONFIG_BLKDEV_RESERVE_ADDRESS; 
 119#endif
 120
 121        init_mm.start_code = (unsigned long) &_stext;
 122        init_mm.end_code = (unsigned long) &_etext;
 123        init_mm.end_data = (unsigned long) &_edata;
 124        init_mm.brk = (unsigned long) 0; 
 125
 126#if (defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)) && defined(CONFIG_GDB_MAGICPRINT)
 127        register_console((struct console *)&gdb_console);
 128#endif
 129
 130        printk(KERN_INFO "\r\n\nuClinux " CPU "\n");
 131        printk(KERN_INFO "Target Hardware: %s\n",_target_name);
 132        printk(KERN_INFO "Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
 133        printk(KERN_INFO "H8/300 series support by Yoshinori Sato <ysato@users.sourceforge.jp>\n");
 134
 135#ifdef DEBUG
 136        printk(KERN_DEBUG "KERNEL -> TEXT=0x%06x-0x%06x DATA=0x%06x-0x%06x "
 137                "BSS=0x%06x-0x%06x\n", (int) &_stext, (int) &_etext,
 138                (int) &_sdata, (int) &_edata,
 139                (int) &_sbss, (int) &_ebss);
 140        printk(KERN_DEBUG "KERNEL -> ROMFS=0x%06x-0x%06x MEM=0x%06x-0x%06x "
 141                "STACK=0x%06x-0x%06x\n",
 142               (int) &_ebss, (int) memory_start,
 143                (int) memory_start, (int) memory_end,
 144                (int) memory_end, (int) &_ramend);
 145#endif
 146
 147#ifdef CONFIG_DEFAULT_CMDLINE
 148        /* set from default command line */
 149        if (*command_line == '\0')
 150                strcpy(command_line,CONFIG_KERNEL_COMMAND);
 151#endif
 152        /* Keep a copy of command line */
 153        *cmdline_p = &command_line[0];
 154        memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 155        boot_command_line[COMMAND_LINE_SIZE-1] = 0;
 156
 157#ifdef DEBUG
 158        if (strlen(*cmdline_p)) 
 159                printk(KERN_DEBUG "Command line: '%s'\n", *cmdline_p);
 160#endif
 161
 162        /*
 163         * give all the memory to the bootmap allocator,  tell it to put the
 164         * boot mem_map at the start of memory
 165         */
 166        bootmap_size = init_bootmem_node(
 167                        NODE_DATA(0),
 168                        memory_start >> PAGE_SHIFT, /* map goes here */
 169                        PAGE_OFFSET >> PAGE_SHIFT,      /* 0 on coldfire */
 170                        memory_end >> PAGE_SHIFT);
 171        /*
 172         * free the usable memory,  we have to make sure we do not free
 173         * the bootmem bitmap so we then reserve it after freeing it :-)
 174         */
 175        free_bootmem(memory_start, memory_end - memory_start);
 176        reserve_bootmem(memory_start, bootmap_size, BOOTMEM_DEFAULT);
 177        /*
 178         * get kmalloc into gear
 179         */
 180        paging_init();
 181        h8300_gpio_init();
 182#if defined(CONFIG_H8300_AKI3068NET) && defined(CONFIG_IDE)
 183        {
 184#define AREABIT(addr) (1 << (((addr) >> 21) & 7))
 185                /* setup BSC */
 186                volatile unsigned char *abwcr = (volatile unsigned char *)ABWCR;
 187                volatile unsigned char *cscr = (volatile unsigned char *)CSCR;
 188                *abwcr &= ~(AREABIT(CONFIG_H8300_IDE_BASE) | AREABIT(CONFIG_H8300_IDE_ALT));
 189                *cscr  |= (AREABIT(CONFIG_H8300_IDE_BASE) | AREABIT(CONFIG_H8300_IDE_ALT)) | 0x0f;
 190        }
 191#endif
 192#ifdef DEBUG
 193        printk(KERN_DEBUG "Done setup_arch\n");
 194#endif
 195}
 196
 197/*
 198 *      Get CPU information for use by the procfs.
 199 */
 200
 201static int show_cpuinfo(struct seq_file *m, void *v)
 202{
 203    char *cpu;
 204    int mode;
 205    u_long clockfreq;
 206
 207    cpu = CPU;
 208    mode = *(volatile unsigned char *)MDCR & 0x07;
 209
 210    clockfreq = CONFIG_CPU_CLOCK;
 211
 212    seq_printf(m,  "CPU:\t\t%s (mode:%d)\n"
 213                   "Clock:\t\t%lu.%1luMHz\n"
 214                   "BogoMips:\t%lu.%02lu\n"
 215                   "Calibration:\t%lu loops\n",
 216                   cpu,mode,
 217                   clockfreq/1000,clockfreq%1000,
 218                   (loops_per_jiffy*HZ)/500000,((loops_per_jiffy*HZ)/5000)%100,
 219                   (loops_per_jiffy*HZ));
 220
 221    return 0;
 222}
 223
 224static void *c_start(struct seq_file *m, loff_t *pos)
 225{
 226        return *pos < NR_CPUS ? ((void *) 0x12345678) : NULL;
 227}
 228
 229static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 230{
 231        ++*pos;
 232        return c_start(m, pos);
 233}
 234
 235static void c_stop(struct seq_file *m, void *v)
 236{
 237}
 238
 239const struct seq_operations cpuinfo_op = {
 240        .start  = c_start,
 241        .next   = c_next,
 242        .stop   = c_stop,
 243        .show   = show_cpuinfo,
 244};
 245