LXR linux/arch/microblaze/kernel/setup.c

   1/*
   2 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
   3 * Copyright (C) 2007-2009 PetaLogix
   4 * Copyright (C) 2006 Atmark Techno, Inc.
   5 *
   6 * This file is subject to the terms and conditions of the GNU General Public
   7 * License. See the file "COPYING" in the main directory of this archive
   8 * for more details.
   9 */
  10
  11#include <linux/init.h>
  12#include <linux/string.h>
  13#include <linux/seq_file.h>
  14#include <linux/cpu.h>
  15#include <linux/initrd.h>
  16#include <linux/console.h>
  17#include <linux/debugfs.h>
  18
  19#include <asm/setup.h>
  20#include <asm/sections.h>
  21#include <asm/page.h>
  22#include <linux/io.h>
  23#include <linux/bug.h>
  24#include <linux/param.h>
  25#include <linux/pci.h>
  26#include <linux/cache.h>
  27#include <linux/of_platform.h>
  28#include <linux/dma-mapping.h>
  29#include <asm/cacheflush.h>
  30#include <asm/entry.h>
  31#include <asm/cpuinfo.h>
  32
  33#include <asm/system.h>
  34#include <asm/prom.h>
  35#include <asm/pgtable.h>
  36
  37DEFINE_PER_CPU(unsigned int, KSP);      /* Saved kernel stack pointer */
  38DEFINE_PER_CPU(unsigned int, KM);       /* Kernel/user mode */
  39DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */
  40DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */
  41DEFINE_PER_CPU(unsigned int, CURRENT_SAVE);     /* Saved current pointer */
  42
  43unsigned int boot_cpuid;
  44char cmd_line[COMMAND_LINE_SIZE];
  45
  46void __init setup_arch(char **cmdline_p)
  47{
  48        *cmdline_p = cmd_line;
  49
  50        console_verbose();
  51
  52        unflatten_device_tree();
  53
  54        /* NOTE I think that this function is not necessary to call */
  55        /* irq_early_init(); */
  56        setup_cpuinfo();
  57
  58        microblaze_cache_init();
  59
  60        setup_memory();
  61
  62        xilinx_pci_init();
  63
  64#if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER)
  65        printk(KERN_NOTICE "Self modified code enable\n");
  66#endif
  67
  68#ifdef CONFIG_VT
  69#if defined(CONFIG_XILINX_CONSOLE)
  70        conswitchp = &xil_con;
  71#elif defined(CONFIG_DUMMY_CONSOLE)
  72        conswitchp = &dummy_con;
  73#endif
  74#endif
  75}
  76
  77#ifdef CONFIG_MTD_UCLINUX
  78/* Handle both romfs and cramfs types, without generating unnecessary
  79 code (ie no point checking for CRAMFS if it's not even enabled) */
  80inline unsigned get_romfs_len(unsigned *addr)
  81{
  82#ifdef CONFIG_ROMFS_FS
  83        if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
  84                return be32_to_cpu(addr[2]);
  85#endif
  86
  87#ifdef CONFIG_CRAMFS
  88        if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
  89                return le32_to_cpu(addr[1]);
  90#endif
  91        return 0;
  92}
  93#endif  /* CONFIG_MTD_UCLINUX_EBSS */
  94
  95void __init machine_early_init(const char *cmdline, unsigned int ram,
  96                unsigned int fdt, unsigned int msr)
  97{
  98        unsigned long *src, *dst = (unsigned long *)0x0;
  99
 100        /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the
 101         * end of kernel. There are two position which we want to check.
 102         * The first is __init_end and the second __bss_start.
 103         */
 104#ifdef CONFIG_MTD_UCLINUX
 105        int romfs_size;
 106        unsigned int romfs_base;
 107        char *old_klimit = klimit;
 108
 109        romfs_base = (ram ? ram : (unsigned int)&__init_end);
 110        romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
 111        if (!romfs_size) {
 112                romfs_base = (unsigned int)&__bss_start;
 113                romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
 114        }
 115
 116        /* Move ROMFS out of BSS before clearing it */
 117        if (romfs_size > 0) {
 118                memmove(&_ebss, (int *)romfs_base, romfs_size);
 119                klimit += romfs_size;
 120        }
 121#endif
 122
 123/* clearing bss section */
 124        memset(__bss_start, 0, __bss_stop-__bss_start);
 125        memset(_ssbss, 0, _esbss-_ssbss);
 126
 127        /* Copy command line passed from bootloader */
 128#ifndef CONFIG_CMDLINE_BOOL
 129        if (cmdline && cmdline[0] != '\0')
 130                strlcpy(cmd_line, cmdline, COMMAND_LINE_SIZE);
 131#endif
 132
 133        lockdep_init();
 134
 135/* initialize device tree for usage in early_printk */
 136        early_init_devtree((void *)_fdt_start);
 137
 138#ifdef CONFIG_EARLY_PRINTK
 139        setup_early_printk(NULL);
 140#endif
 141
 142        eprintk("Ramdisk addr 0x%08x, ", ram);
 143        if (fdt)
 144                eprintk("FDT at 0x%08x\n", fdt);
 145        else
 146                eprintk("Compiled-in FDT at 0x%08x\n",
 147                                        (unsigned int)_fdt_start);
 148
 149#ifdef CONFIG_MTD_UCLINUX
 150        eprintk("Found romfs @ 0x%08x (0x%08x)\n",
 151                        romfs_base, romfs_size);
 152        eprintk("#### klimit %p ####\n", old_klimit);
 153        BUG_ON(romfs_size < 0); /* What else can we do? */
 154
 155        eprintk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
 156                        romfs_size, romfs_base, (unsigned)&_ebss);
 157
 158        eprintk("New klimit: 0x%08x\n", (unsigned)klimit);
 159#endif
 160
 161#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
 162        if (msr)
 163                eprintk("!!!Your kernel has setup MSR instruction but "
 164                                "CPU don't have it %x\n", msr);
 165#else
 166        if (!msr)
 167                eprintk("!!!Your kernel not setup MSR instruction but "
 168                                "CPU have it %x\n", msr);
 169#endif
 170
 171        for (src = __ivt_start; src < __ivt_end; src++, dst++)
 172                *dst = *src;
 173
 174        /* Initialize global data */
 175        per_cpu(KM, 0) = 0x1;   /* We start in kernel mode */
 176        per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
 177}
 178
 179#ifdef CONFIG_DEBUG_FS
 180struct dentry *of_debugfs_root;
 181
 182static int microblaze_debugfs_init(void)
 183{
 184        of_debugfs_root = debugfs_create_dir("microblaze", NULL);
 185
 186        return of_debugfs_root == NULL;
 187}
 188arch_initcall(microblaze_debugfs_init);
 189#endif
 190
 191static int dflt_bus_notify(struct notifier_block *nb,
 192                                unsigned long action, void *data)
 193{
 194        struct device *dev = data;
 195
 196        /* We are only intereted in device addition */
 197        if (action != BUS_NOTIFY_ADD_DEVICE)
 198                return 0;
 199
 200        set_dma_ops(dev, &dma_direct_ops);
 201
 202        return NOTIFY_DONE;
 203}
 204
 205static struct notifier_block dflt_plat_bus_notifier = {
 206        .notifier_call = dflt_bus_notify,
 207        .priority = INT_MAX,
 208};
 209
 210static int __init setup_bus_notifier(void)
 211{
 212        bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier);
 213
 214        return 0;
 215}
 216
 217arch_initcall(setup_bus_notifier);
 218