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/clk-provider.h>
  13#include <linux/clocksource.h>
  14#include <linux/string.h>
  15#include <linux/seq_file.h>
  16#include <linux/cpu.h>
  17#include <linux/initrd.h>
  18#include <linux/console.h>
  19#include <linux/debugfs.h>
  20#include <linux/of_fdt.h>
  21
  22#include <asm/setup.h>
  23#include <asm/sections.h>
  24#include <asm/page.h>
  25#include <linux/io.h>
  26#include <linux/bug.h>
  27#include <linux/param.h>
  28#include <linux/pci.h>
  29#include <linux/cache.h>
  30#include <linux/of_platform.h>
  31#include <linux/dma-mapping.h>
  32#include <asm/cacheflush.h>
  33#include <asm/entry.h>
  34#include <asm/cpuinfo.h>
  35
  36#include <asm/prom.h>
  37#include <asm/pgtable.h>
  38
  39DEFINE_PER_CPU(unsigned int, KSP);      /* Saved kernel stack pointer */
  40DEFINE_PER_CPU(unsigned int, KM);       /* Kernel/user mode */
  41DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */
  42DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */
  43DEFINE_PER_CPU(unsigned int, CURRENT_SAVE);     /* Saved current pointer */
  44
  45unsigned int boot_cpuid;
  46/*
  47 * Placed cmd_line to .data section because can be initialized from
  48 * ASM code. Default position is BSS section which is cleared
  49 * in machine_early_init().
  50 */
  51char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data")));
  52
  53void __init setup_arch(char **cmdline_p)
  54{
  55        *cmdline_p = boot_command_line;
  56
  57        console_verbose();
  58
  59        unflatten_device_tree();
  60
  61        setup_cpuinfo();
  62
  63        microblaze_cache_init();
  64
  65        setup_memory();
  66
  67#ifdef CONFIG_EARLY_PRINTK
  68        /* remap early console to virtual address */
  69        remap_early_printk();
  70#endif
  71
  72        xilinx_pci_init();
  73
  74#if defined(CONFIG_DUMMY_CONSOLE)
  75        conswitchp = &dummy_con;
  76#endif
  77}
  78
  79#ifdef CONFIG_MTD_UCLINUX
  80/* Handle both romfs and cramfs types, without generating unnecessary
  81 code (ie no point checking for CRAMFS if it's not even enabled) */
  82inline unsigned get_romfs_len(unsigned *addr)
  83{
  84#ifdef CONFIG_ROMFS_FS
  85        if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
  86                return be32_to_cpu(addr[2]);
  87#endif
  88
  89#ifdef CONFIG_CRAMFS
  90        if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
  91                return le32_to_cpu(addr[1]);
  92#endif
  93        return 0;
  94}
  95#endif  /* CONFIG_MTD_UCLINUX_EBSS */
  96
  97unsigned long kernel_tlb;
  98
  99void __init machine_early_init(const char *cmdline, unsigned int ram,
 100                unsigned int fdt, unsigned int msr, unsigned int tlb0,
 101                unsigned int tlb1)
 102{
 103        unsigned long *src, *dst;
 104        unsigned int offset = 0;
 105
 106        /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the
 107         * end of kernel. There are two position which we want to check.
 108         * The first is __init_end and the second __bss_start.
 109         */
 110#ifdef CONFIG_MTD_UCLINUX
 111        int romfs_size;
 112        unsigned int romfs_base;
 113        char *old_klimit = klimit;
 114
 115        romfs_base = (ram ? ram : (unsigned int)&__init_end);
 116        romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
 117        if (!romfs_size) {
 118                romfs_base = (unsigned int)&__bss_start;
 119                romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
 120        }
 121
 122        /* Move ROMFS out of BSS before clearing it */
 123        if (romfs_size > 0) {
 124                memmove(&__bss_stop, (int *)romfs_base, romfs_size);
 125                klimit += romfs_size;
 126        }
 127#endif
 128
 129/* clearing bss section */
 130        memset(__bss_start, 0, __bss_stop-__bss_start);
 131        memset(_ssbss, 0, _esbss-_ssbss);
 132
 133/* initialize device tree for usage in early_printk */
 134        early_init_devtree(_fdt_start);
 135
 136#ifdef CONFIG_EARLY_PRINTK
 137        setup_early_printk(NULL);
 138#endif
 139
 140        /* setup kernel_tlb after BSS cleaning
 141         * Maybe worth to move to asm code */
 142        kernel_tlb = tlb0 + tlb1;
 143        /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0,
 144                                                        tlb1, kernel_tlb); */
 145
 146        pr_info("Ramdisk addr 0x%08x, ", ram);
 147        if (fdt)
 148                pr_info("FDT at 0x%08x\n", fdt);
 149        else
 150                pr_info("Compiled-in FDT at %p\n", _fdt_start);
 151
 152#ifdef CONFIG_MTD_UCLINUX
 153        pr_info("Found romfs @ 0x%08x (0x%08x)\n",
 154                        romfs_base, romfs_size);
 155        pr_info("#### klimit %p ####\n", old_klimit);
 156        BUG_ON(romfs_size < 0); /* What else can we do? */
 157
 158        pr_info("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
 159                        romfs_size, romfs_base, (unsigned)&__bss_stop);
 160
 161        pr_info("New klimit: 0x%08x\n", (unsigned)klimit);
 162#endif
 163
 164#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
 165        if (msr) {
 166                pr_info("!!!Your kernel has setup MSR instruction but ");
 167                pr_cont("CPU don't have it %x\n", msr);
 168        }
 169#else
 170        if (!msr) {
 171                pr_info("!!!Your kernel not setup MSR instruction but ");
 172                pr_cont("CPU have it %x\n", msr);
 173        }
 174#endif
 175
 176        /* Do not copy reset vectors. offset = 0x2 means skip the first
 177         * two instructions. dst is pointer to MB vectors which are placed
 178         * in block ram. If you want to copy reset vector setup offset to 0x0 */
 179#if !CONFIG_MANUAL_RESET_VECTOR
 180        offset = 0x2;
 181#endif
 182        dst = (unsigned long *) (offset * sizeof(u32));
 183        for (src = __ivt_start + offset; src < __ivt_end; src++, dst++)
 184                *dst = *src;
 185
 186        /* Initialize global data */
 187        per_cpu(KM, 0) = 0x1;   /* We start in kernel mode */
 188        per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
 189}
 190
 191void __init time_init(void)
 192{
 193        of_clk_init(NULL);
 194        setup_cpuinfo_clk();
 195        clocksource_probe();
 196}
 197
 198#ifdef CONFIG_DEBUG_FS
 199struct dentry *of_debugfs_root;
 200
 201static int microblaze_debugfs_init(void)
 202{
 203        of_debugfs_root = debugfs_create_dir("microblaze", NULL);
 204
 205        return of_debugfs_root == NULL;
 206}
 207arch_initcall(microblaze_debugfs_init);
 208
 209# ifdef CONFIG_MMU
 210static int __init debugfs_tlb(void)
 211{
 212        struct dentry *d;
 213
 214        if (!of_debugfs_root)
 215                return -ENODEV;
 216
 217        d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
 218        if (!d)
 219                return -ENOMEM;
 220
 221        return 0;
 222}
 223device_initcall(debugfs_tlb);
 224# endif
 225#endif
 226