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/mm.h>
  24#include <linux/fs.h>
  25#include <linux/fb.h>
  26#include <linux/console.h>
  27#include <linux/genhd.h>
  28#include <linux/errno.h>
  29#include <linux/string.h>
  30#include <linux/major.h>
  31#include <linux/bootmem.h>
  32#include <linux/seq_file.h>
  33#include <linux/init.h>
  34
  35#include <asm/setup.h>
  36#include <asm/irq.h>
  37#include <asm/pgtable.h>
  38
  39#if defined(__H8300H__)
  40#define CPU "H8/300H"
  41#include <asm/regs306x.h>
  42#endif
  43
  44#if defined(__H8300S__)
  45#define CPU "H8S"
  46#include <asm/regs267x.h>
  47#endif
  48
  49#define STUBSIZE 0xc000;
  50
  51unsigned long rom_length;
  52unsigned long memory_start;
  53unsigned long memory_end;
  54
  55char __initdata command_line[COMMAND_LINE_SIZE];
  56
  57extern int _stext, _etext, _sdata, _edata, _sbss, _ebss, _end;
  58extern int _ramstart, _ramend;
  59extern char _target_name[];
  60extern void h8300_gpio_init(void);
  61
  62#if (defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)) \
  63    && defined(CONFIG_GDB_MAGICPRINT)
  64/* printk with gdb service */
  65static void gdb_console_output(struct console *c, const char *msg, unsigned len)
  66{
  67        for (; len > 0; len--) {
  68                asm("mov.w %0,r2\n\t"
  69                    "jsr @0xc4"::"r"(*msg++):"er2");
  70        }
  71}
  72
  73/*
  74 *      Setup initial baud/bits/parity. We do two things here:
  75 *      - construct a cflag setting for the first rs_open()
  76 *      - initialize the serial port
  77 *      Return non-zero if we didn't find a serial port.
  78 */
  79static int __init gdb_console_setup(struct console *co, char *options)
  80{
  81        return 0;
  82}
  83
  84static const struct console gdb_console = {
  85        .name           = "gdb_con",
  86        .write          = gdb_console_output,
  87        .device         = NULL,
  88        .setup          = gdb_console_setup,
  89        .flags          = CON_PRINTBUFFER,
  90        .index          = -1,
  91};
  92#endif
  93
  94void __init setup_arch(char **cmdline_p)
  95{
  96        int bootmap_size;
  97
  98        memory_start = (unsigned long) &_ramstart;
  99
 100        /* allow for ROMFS on the end of the kernel */
 101        if (memcmp((void *)memory_start, "-rom1fs-", 8) == 0) {
 102#if defined(CONFIG_BLK_DEV_INITRD)
 103                initrd_start = memory_start;
 104                initrd_end = memory_start += be32_to_cpu(((unsigned long *) (memory_start))[2]);
 105#else
 106                memory_start += be32_to_cpu(((unsigned long *) memory_start)[2]);
 107#endif
 108        }
 109        memory_start = PAGE_ALIGN(memory_start);
 110#if !defined(CONFIG_BLKDEV_RESERVE)
 111        memory_end = (unsigned long) &_ramend; /* by now the stack is part of the init task */
 112#if defined(CONFIG_GDB_DEBUG)
 113        memory_end -= STUBSIZE;
 114#endif
 115#else
 116        if ((memory_end < CONFIG_BLKDEV_RESERVE_ADDRESS) && 
 117            (memory_end > CONFIG_BLKDEV_RESERVE_ADDRESS))
 118            /* overlap userarea */
 119            memory_end = CONFIG_BLKDEV_RESERVE_ADDRESS; 
 120#endif
 121
 122        init_mm.start_code = (unsigned long) &_stext;
 123        init_mm.end_code = (unsigned long) &_etext;
 124        init_mm.end_data = (unsigned long) &_edata;
 125        init_mm.brk = (unsigned long) 0; 
 126
 127#if (defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)) && defined(CONFIG_GDB_MAGICPRINT)
 128        register_console((struct console *)&gdb_console);
 129#endif
 130
 131        printk(KERN_INFO "\r\n\nuClinux " CPU "\n");
 132        printk(KERN_INFO "Target Hardware: %s\n",_target_name);
 133        printk(KERN_INFO "Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
 134        printk(KERN_INFO "H8/300 series support by Yoshinori Sato <ysato@users.sourceforge.jp>\n");
 135
 136#ifdef DEBUG
 137        printk(KERN_DEBUG "KERNEL -> TEXT=0x%06x-0x%06x DATA=0x%06x-0x%06x "
 138                "BSS=0x%06x-0x%06x\n", (int) &_stext, (int) &_etext,
 139                (int) &_sdata, (int) &_edata,
 140                (int) &_sbss, (int) &_ebss);
 141        printk(KERN_DEBUG "KERNEL -> ROMFS=0x%06x-0x%06x MEM=0x%06x-0x%06x "
 142                "STACK=0x%06x-0x%06x\n",
 143               (int) &_ebss, (int) memory_start,
 144                (int) memory_start, (int) memory_end,
 145                (int) memory_end, (int) &_ramend);
 146#endif
 147
 148#ifdef CONFIG_DEFAULT_CMDLINE
 149        /* set from default command line */
 150        if (*command_line == '\0')
 151                strcpy(command_line,CONFIG_KERNEL_COMMAND);
 152#endif
 153        /* Keep a copy of command line */
 154        *cmdline_p = &command_line[0];
 155        memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 156        boot_command_line[COMMAND_LINE_SIZE-1] = 0;
 157
 158#ifdef DEBUG
 159        if (strlen(*cmdline_p)) 
 160                printk(KERN_DEBUG "Command line: '%s'\n", *cmdline_p);
 161#endif
 162
 163        /*
 164         * give all the memory to the bootmap allocator,  tell it to put the
 165         * boot mem_map at the start of memory
 166         */
 167        bootmap_size = init_bootmem_node(
 168                        NODE_DATA(0),
 169                        memory_start >> PAGE_SHIFT, /* map goes here */
 170                        PAGE_OFFSET >> PAGE_SHIFT,      /* 0 on coldfire */
 171                        memory_end >> PAGE_SHIFT);
 172        /*
 173         * free the usable memory,  we have to make sure we do not free
 174         * the bootmem bitmap so we then reserve it after freeing it :-)
 175         */
 176        free_bootmem(memory_start, memory_end - memory_start);
 177        reserve_bootmem(memory_start, bootmap_size, BOOTMEM_DEFAULT);
 178        /*
 179         * get kmalloc into gear
 180         */
 181        paging_init();
 182        h8300_gpio_init();
 183#if defined(CONFIG_H8300_AKI3068NET) && defined(CONFIG_IDE)
 184        {
 185#define AREABIT(addr) (1 << (((addr) >> 21) & 7))
 186                /* setup BSC */
 187                volatile unsigned char *abwcr = (volatile unsigned char *)ABWCR;
 188                volatile unsigned char *cscr = (volatile unsigned char *)CSCR;
 189                *abwcr &= ~(AREABIT(CONFIG_H8300_IDE_BASE) | AREABIT(CONFIG_H8300_IDE_ALT));
 190                *cscr  |= (AREABIT(CONFIG_H8300_IDE_BASE) | AREABIT(CONFIG_H8300_IDE_ALT)) | 0x0f;
 191        }
 192#endif
 193#ifdef DEBUG
 194        printk(KERN_DEBUG "Done setup_arch\n");
 195#endif
 196}
 197
 198/*
 199 *      Get CPU information for use by the procfs.
 200 */
 201
 202static int show_cpuinfo(struct seq_file *m, void *v)
 203{
 204    char *cpu;
 205    int mode;
 206    u_long clockfreq;
 207
 208    cpu = CPU;
 209    mode = *(volatile unsigned char *)MDCR & 0x07;
 210
 211    clockfreq = CONFIG_CPU_CLOCK;
 212
 213    seq_printf(m,  "CPU:\t\t%s (mode:%d)\n"
 214                   "Clock:\t\t%lu.%1luMHz\n"
 215                   "BogoMips:\t%lu.%02lu\n"
 216                   "Calibration:\t%lu loops\n",
 217                   cpu,mode,
 218                   clockfreq/1000,clockfreq%1000,
 219                   (loops_per_jiffy*HZ)/500000,((loops_per_jiffy*HZ)/5000)%100,
 220                   (loops_per_jiffy*HZ));
 221
 222    return 0;
 223}
 224
 225static void *c_start(struct seq_file *m, loff_t *pos)
 226{
 227        return *pos < NR_CPUS ? ((void *) 0x12345678) : NULL;
 228}
 229
 230static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 231{
 232        ++*pos;
 233        return c_start(m, pos);
 234}
 235
 236static void c_stop(struct seq_file *m, void *v)
 237{
 238}
 239
 240const struct seq_operations cpuinfo_op = {
 241        .start  = c_start,
 242        .next   = c_next,
 243        .stop   = c_stop,
 244        .show   = show_cpuinfo,
 245};
 246