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
  37 #ifdef CONFIG_BLK_DEV_INITRD
  38 #include <asm/pgtable.h>
  39 #endif
  40
  41 #if defined(__H8300H__)
  42 #define CPU "H8/300H"
  43 #include <asm/regs306x.h>
  44 #endif
  45
  46 #if defined(__H8300S__)
  47 #define CPU "H8S"
  48 #include <asm/regs267x.h>
  49 #endif
  50
  51 #define STUBSIZE 0xc000;
  52
  53 unsigned long rom_length;
  54 unsigned long memory_start;
  55 unsigned long memory_end;
  56
  57 char __initdata command_line[COMMAND_LINE_SIZE];
  58
  59 extern int _stext, _etext, _sdata, _edata, _sbss, _ebss, _end;
  60 extern int _ramstart, _ramend;
  61 extern char _target_name[];
  62 extern void h8300_gpio_init(void);
  63
  64 #if (defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)) \
  65     && defined(CONFIG_GDB_MAGICPRINT)
  66 /* printk with gdb service */
  67 static void gdb_console_output(struct console *c, const char *msg, unsigned len)
  68 {
  69         for (; len > 0; len--) {
  70                 asm("mov.w %0,r2\n\t"
  71                     "jsr @0xc4"::"r"(*msg++):"er2");
  72         }
  73 }
  74
  75 /*
  76  *      Setup initial baud/bits/parity. We do two things here:
  77  *      - construct a cflag setting for the first rs_open()
  78  *      - initialize the serial port
  79  *      Return non-zero if we didn't find a serial port.
  80  */
  81 static int __init gdb_console_setup(struct console *co, char *options)
  82 {
  83         return 0;
  84 }
  85
  86 static const struct console gdb_console = {
  87         .name           = "gdb_con",
  88         .write          = gdb_console_output,
  89         .device         = NULL,
  90         .setup          = gdb_console_setup,
  91         .flags          = CON_PRINTBUFFER,
  92         .index          = -1,
  93 };
  94 #endif
  95
  96 void __init setup_arch(char **cmdline_p)
  97 {
  98         int bootmap_size;
  99
 100         memory_start = (unsigned long) &_ramstart;
 101
 102         /* allow for ROMFS on the end of the kernel */
 103         if (memcmp((void *)memory_start, "-rom1fs-", 8) == 0) {
 104 #if defined(CONFIG_BLK_DEV_INITRD)
 105                 initrd_start = memory_start;
 106                 initrd_end = memory_start += be32_to_cpu(((unsigned long *) (memory_start))[2]);
 107 #else
 108                 memory_start += be32_to_cpu(((unsigned long *) memory_start)[2]);
 109 #endif
 110         }
 111         memory_start = PAGE_ALIGN(memory_start);
 112 #if !defined(CONFIG_BLKDEV_RESERVE)
 113         memory_end = (unsigned long) &_ramend; /* by now the stack is part of the init task */
 114 #if defined(CONFIG_GDB_DEBUG)
 115         memory_end -= STUBSIZE;
 116 #endif
 117 #else
 118         if ((memory_end < CONFIG_BLKDEV_RESERVE_ADDRESS) &&
 119             (memory_end > CONFIG_BLKDEV_RESERVE_ADDRESS))
 120             /* overlap userarea */
 121             memory_end = CONFIG_BLKDEV_RESERVE_ADDRESS;
 122 #endif
 123
 124         init_mm.start_code = (unsigned long) &_stext;
 125         init_mm.end_code = (unsigned long) &_etext;
 126         init_mm.end_data = (unsigned long) &_edata;
 127         init_mm.brk = (unsigned long) 0;
 128
 129 #if (defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)) && defined(CONFIG_GDB_MAGICPRINT)
 130         register_console((struct console *)&gdb_console);
 131 #endif
 132
 133         printk(KERN_INFO "\r\n\nuClinux " CPU "\n");
 134         printk(KERN_INFO "Target Hardware: %s\n",_target_name);
 135         printk(KERN_INFO "Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
 136         printk(KERN_INFO "H8/300 series support by Yoshinori Sato <ysato@users.sourceforge.jp>\n");
 137
 138 #ifdef DEBUG
 139         printk(KERN_DEBUG "KERNEL -> TEXT=0x%06x-0x%06x DATA=0x%06x-0x%06x "
 140                 "BSS=0x%06x-0x%06x\n", (int) &_stext, (int) &_etext,
 141                 (int) &_sdata, (int) &_edata,
 142                 (int) &_sbss, (int) &_ebss);
 143         printk(KERN_DEBUG "KERNEL -> ROMFS=0x%06x-0x%06x MEM=0x%06x-0x%06x "
 144                 "STACK=0x%06x-0x%06x\n",
 145                (int) &_ebss, (int) memory_start,
 146                 (int) memory_start, (int) memory_end,
 147                 (int) memory_end, (int) &_ramend);
 148 #endif
 149
 150 #ifdef CONFIG_DEFAULT_CMDLINE
 151         /* set from default command line */
 152         if (*command_line == '\0')
 153                 strcpy(command_line,CONFIG_KERNEL_COMMAND);
 154 #endif
 155         /* Keep a copy of command line */
 156         *cmdline_p = &command_line[0];
 157         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 158         boot_command_line[COMMAND_LINE_SIZE-1] = 0;
 159
 160 #ifdef DEBUG
 161         if (strlen(*cmdline_p))
 162                 printk(KERN_DEBUG "Command line: '%s'\n", *cmdline_p);
 163 #endif
 164
 165         /*
 166          * give all the memory to the bootmap allocator,  tell it to put the
 167          * boot mem_map at the start of memory
 168          */
 169         bootmap_size = init_bootmem_node(
 170                         NODE_DATA(0),
 171                         memory_start >> PAGE_SHIFT, /* map goes here */
 172                         PAGE_OFFSET >> PAGE_SHIFT,      /* 0 on coldfire */
 173                         memory_end >> PAGE_SHIFT);
 174         /*
 175          * free the usable memory,  we have to make sure we do not free
 176          * the bootmem bitmap so we then reserve it after freeing it :-)
 177          */
 178         free_bootmem(memory_start, memory_end - memory_start);
 179         reserve_bootmem(memory_start, bootmap_size);
 180         /*
 181          * get kmalloc into gear
 182          */
 183         paging_init();
 184         h8300_gpio_init();
 185 #if defined(CONFIG_H8300_AKI3068NET) && defined(CONFIG_IDE)
 186         {
 187 #define AREABIT(addr) (1 << (((addr) >> 21) & 7))
 188                 /* setup BSC */
 189                 volatile unsigned char *abwcr = (volatile unsigned char *)ABWCR;
 190                 volatile unsigned char *cscr = (volatile unsigned char *)CSCR;
 191                 *abwcr &= ~(AREABIT(CONFIG_H8300_IDE_BASE) | AREABIT(CONFIG_H8300_IDE_ALT));
 192                 *cscr  |= (AREABIT(CONFIG_H8300_IDE_BASE) | AREABIT(CONFIG_H8300_IDE_ALT)) | 0x0f;
 193         }
 194 #endif
 195 #ifdef DEBUG
 196         printk(KERN_DEBUG "Done setup_arch\n");
 197 #endif
 198 }
 199
 200 /*
 201  *      Get CPU information for use by the procfs.
 202  */
 203
 204 static int show_cpuinfo(struct seq_file *m, void *v)
 205 {
 206     char *cpu;
 207     int mode;
 208     u_long clockfreq;
 209
 210     cpu = CPU;
 211     mode = *(volatile unsigned char *)MDCR & 0x07;
 212
 213     clockfreq = CONFIG_CPU_CLOCK;
 214
 215     seq_printf(m,  "CPU:\t\t%s (mode:%d)\n"
 216                    "Clock:\t\t%lu.%1luMHz\n"
 217                    "BogoMips:\t%lu.%02lu\n"
 218                    "Calibration:\t%lu loops\n",
 219                    cpu,mode,
 220                    clockfreq/1000,clockfreq%1000,
 221                    (loops_per_jiffy*HZ)/500000,((loops_per_jiffy*HZ)/5000)%100,
 222                    (loops_per_jiffy*HZ));
 223
 224     return 0;
 225 }
 226
 227 static void *c_start(struct seq_file *m, loff_t *pos)
 228 {
 229         return *pos < NR_CPUS ? ((void *) 0x12345678) : NULL;
 230 }
 231
 232 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 233 {
 234         ++*pos;
 235         return c_start(m, pos);
 236 }
 237
 238 static void c_stop(struct seq_file *m, void *v)
 239 {
 240 }
 241
 242 struct seq_operations cpuinfo_op = {
 243         .start  = c_start,
 244         .next   = c_next,
 245         .stop   = c_stop,
 246         .show   = show_cpuinfo,
 247 };