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/prom.h>
  34#include <asm/pgtable.h>
  35
  36DEFINE_PER_CPU(unsigned int, KSP);      /* Saved kernel stack pointer */
  37DEFINE_PER_CPU(unsigned int, KM);       /* Kernel/user mode */
  38DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */
  39DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */
  40DEFINE_PER_CPU(unsigned int, CURRENT_SAVE);     /* Saved current pointer */
  41
  42unsigned int boot_cpuid;
  43/*
  44 * Placed cmd_line to .data section because can be initialized from
  45 * ASM code. Default position is BSS section which is cleared
  46 * in machine_early_init().
  47 */
  48char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data")));
  49
  50void __init setup_arch(char **cmdline_p)
  51{
  52        *cmdline_p = cmd_line;
  53
  54        console_verbose();
  55
  56        unflatten_device_tree();
  57
  58        setup_cpuinfo();
  59
  60        microblaze_cache_init();
  61
  62        setup_memory();
  63
  64#ifdef CONFIG_EARLY_PRINTK
  65        /* remap early console to virtual address */
  66        remap_early_printk();
  67#endif
  68
  69        xilinx_pci_init();
  70
  71#if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER)
  72        pr_notice("Self modified code enable\n");
  73#endif
  74
  75#ifdef CONFIG_VT
  76#if defined(CONFIG_XILINX_CONSOLE)
  77        conswitchp = &xil_con;
  78#elif defined(CONFIG_DUMMY_CONSOLE)
  79        conswitchp = &dummy_con;
  80#endif
  81#endif
  82}
  83
  84#ifdef CONFIG_MTD_UCLINUX
  85/* Handle both romfs and cramfs types, without generating unnecessary
  86 code (ie no point checking for CRAMFS if it's not even enabled) */
  87inline unsigned get_romfs_len(unsigned *addr)
  88{
  89#ifdef CONFIG_ROMFS_FS
  90        if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
  91                return be32_to_cpu(addr[2]);
  92#endif
  93
  94#ifdef CONFIG_CRAMFS
  95        if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
  96                return le32_to_cpu(addr[1]);
  97#endif
  98        return 0;
  99}
 100#endif  /* CONFIG_MTD_UCLINUX_EBSS */
 101
 102unsigned long kernel_tlb;
 103
 104void __init machine_early_init(const char *cmdline, unsigned int ram,
 105                unsigned int fdt, unsigned int msr, unsigned int tlb0,
 106                unsigned int tlb1)
 107{
 108        unsigned long *src, *dst;
 109        unsigned int offset = 0;
 110
 111        /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the
 112         * end of kernel. There are two position which we want to check.
 113         * The first is __init_end and the second __bss_start.
 114         */
 115#ifdef CONFIG_MTD_UCLINUX
 116        int romfs_size;
 117        unsigned int romfs_base;
 118        char *old_klimit = klimit;
 119
 120        romfs_base = (ram ? ram : (unsigned int)&__init_end);
 121        romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
 122        if (!romfs_size) {
 123                romfs_base = (unsigned int)&__bss_start;
 124                romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
 125        }
 126
 127        /* Move ROMFS out of BSS before clearing it */
 128        if (romfs_size > 0) {
 129                memmove(&__bss_stop, (int *)romfs_base, romfs_size);
 130                klimit += romfs_size;
 131        }
 132#endif
 133
 134/* clearing bss section */
 135        memset(__bss_start, 0, __bss_stop-__bss_start);
 136        memset(_ssbss, 0, _esbss-_ssbss);
 137
 138        lockdep_init();
 139
 140/* initialize device tree for usage in early_printk */
 141        early_init_devtree((void *)_fdt_start);
 142
 143#ifdef CONFIG_EARLY_PRINTK
 144        setup_early_printk(NULL);
 145#endif
 146
 147        /* setup kernel_tlb after BSS cleaning
 148         * Maybe worth to move to asm code */
 149        kernel_tlb = tlb0 + tlb1;
 150        /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0,
 151                                                        tlb1, kernel_tlb); */
 152
 153        pr_info("Ramdisk addr 0x%08x, ", ram);
 154        if (fdt)
 155                pr_info("FDT at 0x%08x\n", fdt);
 156        else
 157                pr_info("Compiled-in FDT at 0x%08x\n",
 158                                        (unsigned int)_fdt_start);
 159
 160#ifdef CONFIG_MTD_UCLINUX
 161        pr_info("Found romfs @ 0x%08x (0x%08x)\n",
 162                        romfs_base, romfs_size);
 163        pr_info("#### klimit %p ####\n", old_klimit);
 164        BUG_ON(romfs_size < 0); /* What else can we do? */
 165
 166        pr_info("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
 167                        romfs_size, romfs_base, (unsigned)&__bss_stop);
 168
 169        pr_info("New klimit: 0x%08x\n", (unsigned)klimit);
 170#endif
 171
 172#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
 173        if (msr) {
 174                pr_info("!!!Your kernel has setup MSR instruction but ");
 175                pr_cont("CPU don't have it %x\n", msr);
 176        }
 177#else
 178        if (!msr) {
 179                pr_info("!!!Your kernel not setup MSR instruction but ");
 180                pr_cont"CPU have it %x\n", msr);
 181        }
 182#endif
 183
 184        /* Do not copy reset vectors. offset = 0x2 means skip the first
 185         * two instructions. dst is pointer to MB vectors which are placed
 186         * in block ram. If you want to copy reset vector setup offset to 0x0 */
 187#if !CONFIG_MANUAL_RESET_VECTOR
 188        offset = 0x2;
 189#endif
 190        dst = (unsigned long *) (offset * sizeof(u32));
 191        for (src = __ivt_start + offset; src < __ivt_end; src++, dst++)
 192                *dst = *src;
 193
 194        /* Initialize global data */
 195        per_cpu(KM, 0) = 0x1;   /* We start in kernel mode */
 196        per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
 197}
 198
 199#ifdef CONFIG_DEBUG_FS
 200struct dentry *of_debugfs_root;
 201
 202static int microblaze_debugfs_init(void)
 203{
 204        of_debugfs_root = debugfs_create_dir("microblaze", NULL);
 205
 206        return of_debugfs_root == NULL;
 207}
 208arch_initcall(microblaze_debugfs_init);
 209
 210# ifdef CONFIG_MMU
 211static int __init debugfs_tlb(void)
 212{
 213        struct dentry *d;
 214
 215        if (!of_debugfs_root)
 216                return -ENODEV;
 217
 218        d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
 219        if (!d)
 220                return -ENOMEM;
 221
 222        return 0;
 223}
 224device_initcall(debugfs_tlb);
 225# endif
 226#endif
 227
 228static int dflt_bus_notify(struct notifier_block *nb,
 229                                unsigned long action, void *data)
 230{
 231        struct device *dev = data;
 232
 233        /* We are only intereted in device addition */
 234        if (action != BUS_NOTIFY_ADD_DEVICE)
 235                return 0;
 236
 237        set_dma_ops(dev, &dma_direct_ops);
 238
 239        return NOTIFY_DONE;
 240}
 241
 242static struct notifier_block dflt_plat_bus_notifier = {
 243        .notifier_call = dflt_bus_notify,
 244        .priority = INT_MAX,
 245};
 246
 247static int __init setup_bus_notifier(void)
 248{
 249        bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier);
 250
 251        return 0;
 252}
 253
 254arch_initcall(setup_bus_notifier);
 255