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
  51 unsigned long rom_length;
  52 unsigned long memory_start;
  53 unsigned long memory_end;
  54
  55 char __initdata command_line[COMMAND_LINE_SIZE];
  56
  57 extern int _stext, _etext, _sdata, _edata, _sbss, _ebss, _end;
  58 extern int _ramstart, _ramend;
  59 extern char _target_name[];
  60 extern 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 */
  65 static 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  */
  79 static int __init gdb_console_setup(struct console *co, char *options)
  80 {
  81         return 0;
  82 }
  83
  84 static 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
  94 void __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
 202 static 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
 225 static void *c_start(struct seq_file *m, loff_t *pos)
 226 {
 227         return *pos < NR_CPUS ? ((void *) 0x12345678) : NULL;
 228 }
 229
 230 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 231 {
 232         ++*pos;
 233         return c_start(m, pos);
 234 }
 235
 236 static void c_stop(struct seq_file *m, void *v)
 237 {
 238 }
 239
 240 const struct seq_operations cpuinfo_op = {
 241         .start  = c_start,
 242         .next   = c_next,
 243         .stop   = c_stop,
 244         .show   = show_cpuinfo,
 245 };