246 lines
6.6 KiB
C
246 lines
6.6 KiB
C
/*
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* linux/arch/h8300/kernel/setup.c
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*
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* Copyleft ()) 2000 James D. Schettine {james@telos-systems.com}
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* Copyright (C) 1999,2000 Greg Ungerer (gerg@snapgear.com)
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* Copyright (C) 1998,1999 D. Jeff Dionne <jeff@lineo.ca>
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* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
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* Copyright (C) 1995 Hamish Macdonald
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* Copyright (C) 2000 Lineo Inc. (www.lineo.com)
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* Copyright (C) 2001 Lineo, Inc. <www.lineo.com>
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*
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* H8/300 porting Yoshinori Sato <ysato@users.sourceforge.jp>
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*/
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/*
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* This file handles the architecture-dependent parts of system setup
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/fb.h>
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#include <linux/console.h>
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#include <linux/genhd.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/major.h>
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#include <linux/bootmem.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <asm/setup.h>
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#include <asm/irq.h>
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#include <asm/pgtable.h>
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#if defined(__H8300H__)
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#define CPU "H8/300H"
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#include <asm/regs306x.h>
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#endif
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#if defined(__H8300S__)
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#define CPU "H8S"
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#include <asm/regs267x.h>
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#endif
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#define STUBSIZE 0xc000
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unsigned long rom_length;
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unsigned long memory_start;
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unsigned long memory_end;
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char __initdata command_line[COMMAND_LINE_SIZE];
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extern int _stext, _etext, _sdata, _edata, _sbss, _ebss, _end;
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extern int _ramstart, _ramend;
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extern char _target_name[];
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extern void h8300_gpio_init(void);
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#if (defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)) \
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&& defined(CONFIG_GDB_MAGICPRINT)
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/* printk with gdb service */
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static void gdb_console_output(struct console *c, const char *msg, unsigned len)
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{
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for (; len > 0; len--) {
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asm("mov.w %0,r2\n\t"
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"jsr @0xc4"::"r"(*msg++):"er2");
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}
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}
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/*
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* Setup initial baud/bits/parity. We do two things here:
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* - construct a cflag setting for the first rs_open()
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* - initialize the serial port
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* Return non-zero if we didn't find a serial port.
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*/
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static int __init gdb_console_setup(struct console *co, char *options)
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{
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return 0;
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}
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static const struct console gdb_console = {
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.name = "gdb_con",
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.write = gdb_console_output,
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.device = NULL,
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.setup = gdb_console_setup,
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.flags = CON_PRINTBUFFER,
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.index = -1,
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};
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#endif
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void __init setup_arch(char **cmdline_p)
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{
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int bootmap_size;
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memory_start = (unsigned long) &_ramstart;
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/* allow for ROMFS on the end of the kernel */
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if (memcmp((void *)memory_start, "-rom1fs-", 8) == 0) {
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#if defined(CONFIG_BLK_DEV_INITRD)
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initrd_start = memory_start;
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initrd_end = memory_start += be32_to_cpu(((unsigned long *) (memory_start))[2]);
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#else
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memory_start += be32_to_cpu(((unsigned long *) memory_start)[2]);
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#endif
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}
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memory_start = PAGE_ALIGN(memory_start);
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#if !defined(CONFIG_BLKDEV_RESERVE)
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memory_end = (unsigned long) &_ramend; /* by now the stack is part of the init task */
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#if defined(CONFIG_GDB_DEBUG)
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memory_end -= STUBSIZE;
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#endif
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#else
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if ((memory_end < CONFIG_BLKDEV_RESERVE_ADDRESS) &&
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(memory_end > CONFIG_BLKDEV_RESERVE_ADDRESS))
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/* overlap userarea */
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memory_end = CONFIG_BLKDEV_RESERVE_ADDRESS;
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#endif
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init_mm.start_code = (unsigned long) &_stext;
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init_mm.end_code = (unsigned long) &_etext;
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init_mm.end_data = (unsigned long) &_edata;
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init_mm.brk = (unsigned long) 0;
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#if (defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)) && defined(CONFIG_GDB_MAGICPRINT)
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register_console((struct console *)&gdb_console);
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#endif
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printk(KERN_INFO "\r\n\nuClinux " CPU "\n");
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printk(KERN_INFO "Target Hardware: %s\n",_target_name);
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printk(KERN_INFO "Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
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printk(KERN_INFO "H8/300 series support by Yoshinori Sato <ysato@users.sourceforge.jp>\n");
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#ifdef DEBUG
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printk(KERN_DEBUG "KERNEL -> TEXT=0x%06x-0x%06x DATA=0x%06x-0x%06x "
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"BSS=0x%06x-0x%06x\n", (int) &_stext, (int) &_etext,
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(int) &_sdata, (int) &_edata,
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(int) &_sbss, (int) &_ebss);
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printk(KERN_DEBUG "KERNEL -> ROMFS=0x%06x-0x%06x MEM=0x%06x-0x%06x "
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"STACK=0x%06x-0x%06x\n",
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(int) &_ebss, (int) memory_start,
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(int) memory_start, (int) memory_end,
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(int) memory_end, (int) &_ramend);
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#endif
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#ifdef CONFIG_DEFAULT_CMDLINE
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/* set from default command line */
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if (*command_line == '\0')
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strcpy(command_line,CONFIG_KERNEL_COMMAND);
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#endif
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/* Keep a copy of command line */
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*cmdline_p = &command_line[0];
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memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
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boot_command_line[COMMAND_LINE_SIZE-1] = 0;
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#ifdef DEBUG
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if (strlen(*cmdline_p))
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printk(KERN_DEBUG "Command line: '%s'\n", *cmdline_p);
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#endif
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/*
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* give all the memory to the bootmap allocator, tell it to put the
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* boot mem_map at the start of memory
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*/
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bootmap_size = init_bootmem_node(
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NODE_DATA(0),
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memory_start >> PAGE_SHIFT, /* map goes here */
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PAGE_OFFSET >> PAGE_SHIFT, /* 0 on coldfire */
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memory_end >> PAGE_SHIFT);
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/*
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* free the usable memory, we have to make sure we do not free
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* the bootmem bitmap so we then reserve it after freeing it :-)
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*/
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free_bootmem(memory_start, memory_end - memory_start);
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reserve_bootmem(memory_start, bootmap_size, BOOTMEM_DEFAULT);
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/*
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* get kmalloc into gear
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*/
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paging_init();
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h8300_gpio_init();
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#if defined(CONFIG_H8300_AKI3068NET) && defined(CONFIG_IDE)
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{
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#define AREABIT(addr) (1 << (((addr) >> 21) & 7))
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/* setup BSC */
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volatile unsigned char *abwcr = (volatile unsigned char *)ABWCR;
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volatile unsigned char *cscr = (volatile unsigned char *)CSCR;
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*abwcr &= ~(AREABIT(CONFIG_H8300_IDE_BASE) | AREABIT(CONFIG_H8300_IDE_ALT));
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*cscr |= (AREABIT(CONFIG_H8300_IDE_BASE) | AREABIT(CONFIG_H8300_IDE_ALT)) | 0x0f;
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}
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#endif
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#ifdef DEBUG
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printk(KERN_DEBUG "Done setup_arch\n");
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#endif
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}
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/*
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* Get CPU information for use by the procfs.
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*/
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static int show_cpuinfo(struct seq_file *m, void *v)
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{
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char *cpu;
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int mode;
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u_long clockfreq;
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cpu = CPU;
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mode = *(volatile unsigned char *)MDCR & 0x07;
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clockfreq = CONFIG_CPU_CLOCK;
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seq_printf(m, "CPU:\t\t%s (mode:%d)\n"
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"Clock:\t\t%lu.%1luMHz\n"
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"BogoMips:\t%lu.%02lu\n"
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"Calibration:\t%lu loops\n",
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cpu,mode,
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clockfreq/1000,clockfreq%1000,
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(loops_per_jiffy*HZ)/500000,((loops_per_jiffy*HZ)/5000)%100,
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(loops_per_jiffy*HZ));
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return 0;
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}
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static void *c_start(struct seq_file *m, loff_t *pos)
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{
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return *pos < NR_CPUS ? ((void *) 0x12345678) : NULL;
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}
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static void *c_next(struct seq_file *m, void *v, loff_t *pos)
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{
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++*pos;
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return c_start(m, pos);
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}
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static void c_stop(struct seq_file *m, void *v)
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{
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}
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const struct seq_operations cpuinfo_op = {
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.start = c_start,
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.next = c_next,
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.stop = c_stop,
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.show = show_cpuinfo,
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};
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