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