588baeac38
This patch adds m68knommu support for getting the kernel command line arguments from uboot, including the passing of an initrd image from uboot. We use this on a 5270/5271 based board, and have used it on the 5271evb development board. It is based on a patch found in the linux-2.6-denx git tree, although that tree seems to have had lots of other changes since which are not in the main Linus kernel. I believe this will work on all coldfires, although other m68knommu might be missing the _init_sp stuff in head.S as far as I can tell. I only have the coldfire to test on. Signed-off-by: Lennart Sorensen <lsorense@csclub.uwaterloo.ca> Signed-off-by: Greg Ungerer <gerg@uclinux.org>
356 lines
9.5 KiB
C
356 lines
9.5 KiB
C
/*
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* linux/arch/m68knommu/kernel/setup.c
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*
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* Copyright (C) 1999-2007 Greg Ungerer (gerg@snapgear.com)
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* Copyright (C) 1998,1999 D. Jeff Dionne <jeff@uClinux.org>
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* Copyleft ()) 2000 James D. Schettine {james@telos-systems.com}
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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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* 68VZ328 Fixes/support Evan Stawnyczy <e@lineo.ca>
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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/fb.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/console.h>
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#include <linux/errno.h>
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#include <linux/string.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 <linux/initrd.h>
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#include <linux/root_dev.h>
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#include <asm/setup.h>
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#include <asm/irq.h>
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#include <asm/machdep.h>
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#include <asm/pgtable.h>
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unsigned long memory_start;
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unsigned long memory_end;
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EXPORT_SYMBOL(memory_start);
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EXPORT_SYMBOL(memory_end);
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char __initdata command_line[COMMAND_LINE_SIZE];
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/* machine dependent timer functions */
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void (*mach_gettod)(int*, int*, int*, int*, int*, int*);
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int (*mach_set_clock_mmss)(unsigned long);
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/* machine dependent reboot functions */
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void (*mach_reset)(void);
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void (*mach_halt)(void);
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void (*mach_power_off)(void);
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#ifdef CONFIG_M68000
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#define CPU "MC68000"
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#endif
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#ifdef CONFIG_M68328
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#define CPU "MC68328"
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#endif
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#ifdef CONFIG_M68EZ328
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#define CPU "MC68EZ328"
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#endif
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#ifdef CONFIG_M68VZ328
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#define CPU "MC68VZ328"
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#endif
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#ifdef CONFIG_M68360
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#define CPU "MC68360"
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#endif
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#if defined(CONFIG_M5206)
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#define CPU "COLDFIRE(m5206)"
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#endif
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#if defined(CONFIG_M5206e)
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#define CPU "COLDFIRE(m5206e)"
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#endif
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#if defined(CONFIG_M520x)
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#define CPU "COLDFIRE(m520x)"
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#endif
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#if defined(CONFIG_M523x)
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#define CPU "COLDFIRE(m523x)"
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#endif
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#if defined(CONFIG_M5249)
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#define CPU "COLDFIRE(m5249)"
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#endif
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#if defined(CONFIG_M5271)
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#define CPU "COLDFIRE(m5270/5271)"
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#endif
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#if defined(CONFIG_M5272)
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#define CPU "COLDFIRE(m5272)"
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#endif
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#if defined(CONFIG_M5275)
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#define CPU "COLDFIRE(m5274/5275)"
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#endif
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#if defined(CONFIG_M528x)
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#define CPU "COLDFIRE(m5280/5282)"
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#endif
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#if defined(CONFIG_M5307)
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#define CPU "COLDFIRE(m5307)"
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#endif
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#if defined(CONFIG_M532x)
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#define CPU "COLDFIRE(m532x)"
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#endif
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#if defined(CONFIG_M5407)
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#define CPU "COLDFIRE(m5407)"
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#endif
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#ifndef CPU
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#define CPU "UNKNOWN"
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#endif
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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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#if defined(CONFIG_UBOOT)
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/*
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* parse_uboot_commandline
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*
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* Copies u-boot commandline arguments and store them in the proper linux
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* variables.
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*
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* Assumes:
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* _init_sp global contains the address in the stack pointer when the
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* kernel starts (see head.S::_start)
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*
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* U-Boot calling convention:
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* (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
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*
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* _init_sp can be parsed as such
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*
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* _init_sp+00 = u-boot cmd after jsr into kernel (skip)
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* _init_sp+04 = &kernel board_info (residual data)
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* _init_sp+08 = &initrd_start
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* _init_sp+12 = &initrd_end
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* _init_sp+16 = &cmd_start
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* _init_sp+20 = &cmd_end
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*
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* This also assumes that the memory locations pointed to are still
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* unmodified. U-boot places them near the end of external SDRAM.
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*
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* Argument(s):
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* commandp = the linux commandline arg container to fill.
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* size = the sizeof commandp.
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*
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* Returns:
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*/
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void parse_uboot_commandline(char *commandp, int size)
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{
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extern unsigned long _init_sp;
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unsigned long *sp;
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unsigned long uboot_kbd;
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unsigned long uboot_initrd_start, uboot_initrd_end;
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unsigned long uboot_cmd_start, uboot_cmd_end;
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sp = (unsigned long *)_init_sp;
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uboot_kbd = sp[1];
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uboot_initrd_start = sp[2];
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uboot_initrd_end = sp[3];
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uboot_cmd_start = sp[4];
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uboot_cmd_end = sp[5];
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if (uboot_cmd_start && uboot_cmd_end)
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strncpy(commandp, (const char *)uboot_cmd_start, size);
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#if defined(CONFIG_BLK_DEV_INITRD)
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if (uboot_initrd_start && uboot_initrd_end &&
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(uboot_initrd_end > uboot_initrd_start)) {
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initrd_start = uboot_initrd_start;
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initrd_end = uboot_initrd_end;
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ROOT_DEV = Root_RAM0;
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printk(KERN_INFO "initrd at 0x%lx:0x%lx\n",
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initrd_start, initrd_end);
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}
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#endif /* if defined(CONFIG_BLK_DEV_INITRD) */
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}
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#endif /* #if defined(CONFIG_UBOOT) */
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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 = PAGE_ALIGN(_ramstart);
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memory_end = _ramend;
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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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config_BSP(&command_line[0], sizeof(command_line));
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#if defined(CONFIG_BOOTPARAM)
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strncpy(&command_line[0], CONFIG_BOOTPARAM_STRING, sizeof(command_line));
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command_line[sizeof(command_line) - 1] = 0;
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#endif /* CONFIG_BOOTPARAM */
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#if defined(CONFIG_UBOOT)
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/* CONFIG_UBOOT and CONFIG_BOOTPARAM defined, concatenate cmdline */
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#if defined(CONFIG_BOOTPARAM)
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/* Add the whitespace separator */
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command_line[strlen(CONFIG_BOOTPARAM_STRING)] = ' ';
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/* Parse uboot command line into the rest of the buffer */
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parse_uboot_commandline(
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&command_line[(strlen(CONFIG_BOOTPARAM_STRING)+1)],
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(sizeof(command_line) -
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(strlen(CONFIG_BOOTPARAM_STRING)+1)));
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/* Only CONFIG_UBOOT defined, create cmdline */
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#else
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parse_uboot_commandline(&command_line[0], sizeof(command_line));
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#endif /* CONFIG_BOOTPARAM */
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command_line[sizeof(command_line) - 1] = 0;
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#endif /* CONFIG_UBOOT */
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printk(KERN_INFO "\x0F\r\n\nuClinux/" CPU "\n");
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#ifdef CONFIG_UCDIMM
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printk(KERN_INFO "uCdimm by Lineo, Inc. <www.lineo.com>\n");
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#endif
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#ifdef CONFIG_M68VZ328
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printk(KERN_INFO "M68VZ328 support by Evan Stawnyczy <e@lineo.ca>\n");
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#endif
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#ifdef CONFIG_COLDFIRE
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printk(KERN_INFO "COLDFIRE port done by Greg Ungerer, gerg@snapgear.com\n");
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#ifdef CONFIG_M5307
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printk(KERN_INFO "Modified for M5307 by Dave Miller, dmiller@intellistor.com\n");
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#endif
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#ifdef CONFIG_ELITE
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printk(KERN_INFO "Modified for M5206eLITE by Rob Scott, rscott@mtrob.fdns.net\n");
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#endif
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#endif
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printk(KERN_INFO "Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
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#if defined( CONFIG_PILOT ) && defined( CONFIG_M68328 )
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printk(KERN_INFO "TRG SuperPilot FLASH card support <info@trgnet.com>\n");
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#endif
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#if defined( CONFIG_PILOT ) && defined( CONFIG_M68EZ328 )
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printk(KERN_INFO "PalmV support by Lineo Inc. <jeff@uclinux.com>\n");
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#endif
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#if defined (CONFIG_M68360)
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printk(KERN_INFO "QUICC port done by SED Systems <hamilton@sedsystems.ca>,\n");
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printk(KERN_INFO "based on 2.0.38 port by Lineo Inc. <mleslie@lineo.com>.\n");
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#endif
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#ifdef CONFIG_DRAGEN2
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printk(KERN_INFO "DragonEngine II board support by Georges Menie\n");
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#endif
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#ifdef CONFIG_M5235EVB
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printk(KERN_INFO "Motorola M5235EVB support (C)2005 Syn-tech Systems, Inc. (Jate Sujjavanich)\n");
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#endif
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pr_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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pr_debug("MEMORY -> ROMFS=0x%06x-0x%06x MEM=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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/* 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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#if defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_DUMMY_CONSOLE)
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conswitchp = &dummy_con;
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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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#if defined(CONFIG_UBOOT) && defined(CONFIG_BLK_DEV_INITRD)
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if ((initrd_start > 0) && (initrd_start < initrd_end) &&
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(initrd_end < memory_end))
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reserve_bootmem(initrd_start, initrd_end - initrd_start,
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BOOTMEM_DEFAULT);
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#endif /* if defined(CONFIG_BLK_DEV_INITRD) */
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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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}
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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, *mmu, *fpu;
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u_long clockfreq;
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cpu = CPU;
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mmu = "none";
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fpu = "none";
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#ifdef CONFIG_COLDFIRE
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clockfreq = (loops_per_jiffy * HZ) * 3;
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#else
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clockfreq = (loops_per_jiffy * HZ) * 16;
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#endif
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seq_printf(m, "CPU:\t\t%s\n"
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"MMU:\t\t%s\n"
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"FPU:\t\t%s\n"
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"Clocking:\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, mmu, fpu,
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clockfreq / 1000000,
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(clockfreq / 100000) % 10,
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(loops_per_jiffy * HZ) / 500000,
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((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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