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/config.h>
  20 #include <linux/kernel.h>
  21 #include <linux/sched.h>
  22 #include <linux/delay.h>
  23 #include <linux/interrupt.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
  38 #ifdef CONFIG_BLK_DEV_INITRD
  39 #include <asm/pgtable.h>
  40 #endif
  41
  42 #if defined(__H8300H__)
  43 #define CPU "H8/300H"
  44 #include <asm/regs306x.h>
  45 #endif
  46
  47 #if defined(__H8300S__)
  48 #define CPU "H8S"
  49 #include <asm/regs267x.h>
  50 #endif
  51
  52 #define STUBSIZE 0xc000;
  53
  54 unsigned long rom_length;
  55 unsigned long memory_start;
  56 unsigned long memory_end;
  57
  58 char command_line[COMMAND_LINE_SIZE];
  59
  60 extern int _stext, _etext, _sdata, _edata, _sbss, _ebss, _end;
  61 extern int _ramstart, _ramend;
  62 extern char _target_name[];
  63 extern void h8300_gpio_init(void);
  64
  65 #if (defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)) \
  66     && defined(CONFIG_GDB_MAGICPRINT)
  67 /* printk with gdb service */
  68 static void gdb_console_output(struct console *c, const char *msg, unsigned len)
  69 {
  70         for (; len > 0; len--) {
  71                 asm("mov.w %0,r2\n\t"
  72                     "jsr @0xc4"::"r"(*msg++):"er2");
  73         }
  74 }
  75
  76 /*
  77  *      Setup initial baud/bits/parity. We do two things here:
  78  *      - construct a cflag setting for the first rs_open()
  79  *      - initialize the serial port
  80  *      Return non-zero if we didn't find a serial port.
  81  */
  82 static int __init gdb_console_setup(struct console *co, char *options)
  83 {
  84         return 0;
  85 }
  86
  87 static const struct console gdb_console = {
  88         .name           = "gdb_con",
  89         .write          = gdb_console_output,
  90         .device         = NULL,
  91         .setup          = gdb_console_setup,
  92         .flags          = CON_PRINTBUFFER,
  93         .index          = -1,
  94 };
  95 #endif
  96
  97 void __init setup_arch(char **cmdline_p)
  98 {
  99         int bootmap_size;
 100
 101         memory_start = (unsigned long) &_ramstart;
 102
 103         /* allow for ROMFS on the end of the kernel */
 104         if (memcmp((void *)memory_start, "-rom1fs-", 8) == 0) {
 105 #if defined(CONFIG_BLK_DEV_INITRD)
 106                 initrd_start = memory_start;
 107                 initrd_end = memory_start += be32_to_cpu(((unsigned long *) (memory_start))[2]);
 108 #else
 109                 memory_start += be32_to_cpu(((unsigned long *) memory_start)[2]);
 110 #endif
 111         }
 112         memory_start = PAGE_ALIGN(memory_start);
 113 #if !defined(CONFIG_BLKDEV_RESERVE)
 114         memory_end = (unsigned long) &_ramend; /* by now the stack is part of the init task */
 115 #if defined(CONFIG_GDB_DEBUG)
 116         memory_end -= STUBSIZE;
 117 #endif
 118 #else
 119         if ((memory_end < CONFIG_BLKDEV_RESERVE_ADDRESS) &&
 120             (memory_end > CONFIG_BLKDEV_RESERVE_ADDRESS)
 121             /* overlap userarea */
 122             memory_end = CONFIG_BLKDEV_RESERVE_ADDRESS;
 123 #endif
 124
 125         init_mm.start_code = (unsigned long) &_stext;
 126         init_mm.end_code = (unsigned long) &_etext;
 127         init_mm.end_data = (unsigned long) &_edata;
 128         init_mm.brk = (unsigned long) 0;
 129
 130 #if (defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)) && defined(CONFIG_GDB_MAGICPRINT)
 131         register_console((struct console *)&gdb_console);
 132 #endif
 133
 134         printk(KERN_INFO "\r\n\nuClinux " CPU "\n");
 135         printk(KERN_INFO "Target Hardware: %s\n",_target_name);
 136         printk(KERN_INFO "Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
 137         printk(KERN_INFO "H8/300 series support by Yoshinori Sato <ysato@users.sourceforge.jp>\n");
 138
 139 #ifdef DEBUG
 140         printk(KERN_DEBUG "KERNEL -> TEXT=0x%06x-0x%06x DATA=0x%06x-0x%06x "
 141                 "BSS=0x%06x-0x%06x\n", (int) &_stext, (int) &_etext,
 142                 (int) &_sdata, (int) &_edata,
 143                 (int) &_sbss, (int) &_ebss);
 144         printk(KERN_DEBUG "KERNEL -> ROMFS=0x%06x-0x%06x MEM=0x%06x-0x%06x "
 145                 "STACK=0x%06x-0x%06x\n",
 146                (int) &_ebss, (int) memory_start,
 147                 (int) memory_start, (int) memory_end,
 148                 (int) memory_end, (int) &_ramend);
 149 #endif
 150
 151 #ifdef CONFIG_DEFAULT_CMDLINE
 152         /* set from default command line */
 153         if (*command_line == '\0')
 154                 strcpy(command_line,CONFIG_KERNEL_COMMAND);
 155 #endif
 156         /* Keep a copy of command line */
 157         *cmdline_p = &command_line[0];
 158         memcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
 159         saved_command_line[COMMAND_LINE_SIZE-1] = 0;
 160
 161 #ifdef DEBUG
 162         if (strlen(*cmdline_p))
 163                 printk(KERN_DEBUG "Command line: '%s'\n", *cmdline_p);
 164 #endif
 165
 166         /*
 167          * give all the memory to the bootmap allocator,  tell it to put the
 168          * boot mem_map at the start of memory
 169          */
 170         bootmap_size = init_bootmem_node(
 171                         NODE_DATA(0),
 172                         memory_start >> PAGE_SHIFT, /* map goes here */
 173                         PAGE_OFFSET >> PAGE_SHIFT,      /* 0 on coldfire */
 174                         memory_end >> PAGE_SHIFT);
 175         /*
 176          * free the usable memory,  we have to make sure we do not free
 177          * the bootmem bitmap so we then reserve it after freeing it :-)
 178          */
 179         free_bootmem(memory_start, memory_end - memory_start);
 180         reserve_bootmem(memory_start, bootmap_size);
 181         /*
 182          * get kmalloc into gear
 183          */
 184         paging_init();
 185         h8300_gpio_init();
 186 #if defined(CONFIG_H8300_AKI3068NET) && defined(CONFIG_IDE)
 187         {
 188 #define AREABIT(addr) (1 << (((addr) >> 21) & 7))
 189                 /* setup BSC */
 190                 volatile unsigned char *abwcr = (volatile unsigned char *)ABWCR;
 191                 volatile unsigned char *cscr = (volatile unsigned char *)CSCR;
 192                 *abwcr &= ~(AREABIT(CONFIG_H8300_IDE_BASE) | AREABIT(CONFIG_H8300_IDE_ALT));
 193                 *cscr  |= (AREABIT(CONFIG_H8300_IDE_BASE) | AREABIT(CONFIG_H8300_IDE_ALT)) | 0x0f;
 194         }
 195 #endif
 196 #ifdef DEBUG
 197         printk(KERN_DEBUG "Done setup_arch\n");
 198 #endif
 199 }
 200
 201 /*
 202  *      Get CPU information for use by the procfs.
 203  */
 204
 205 static int show_cpuinfo(struct seq_file *m, void *v)
 206 {
 207     char *cpu;
 208     int mode;
 209     u_long clockfreq;
 210
 211     cpu = CPU;
 212     mode = *(volatile unsigned char *)MDCR & 0x07;
 213
 214     clockfreq = CONFIG_CPU_CLOCK;
 215
 216     seq_printf(m,  "CPU:\t\t%s (mode:%d)\n"
 217                    "Clock:\t\t%lu.%1luMHz\n"
 218                    "BogoMips:\t%lu.%02lu\n"
 219                    "Calibration:\t%lu loops\n",
 220                    cpu,mode,
 221                    clockfreq/1000,clockfreq%1000,
 222                    (loops_per_jiffy*HZ)/500000,((loops_per_jiffy*HZ)/5000)%100,
 223                    (loops_per_jiffy*HZ));
 224
 225     return 0;
 226 }
 227
 228 static void *c_start(struct seq_file *m, loff_t *pos)
 229 {
 230         return *pos < NR_CPUS ? ((void *) 0x12345678) : NULL;
 231 }
 232
 233 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 234 {
 235         ++*pos;
 236         return c_start(m, pos);
 237 }
 238
 239 static void c_stop(struct seq_file *m, void *v)
 240 {
 241 }
 242
 243 struct seq_operations cpuinfo_op = {
 244         .start  = c_start,
 245         .next   = c_next,
 246         .stop   = c_stop,
 247         .show   = show_cpuinfo,
 248 };