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/cache.h>
  26 #include <asm/cacheflush.h>
  27 #include <asm/entry.h>
  28 #include <asm/cpuinfo.h>
  29
  30 #include <asm/system.h>
  31 #include <asm/prom.h>
  32 #include <asm/pgtable.h>
  33
  34 DEFINE_PER_CPU(unsigned int, KSP);      /* Saved kernel stack pointer */
  35 DEFINE_PER_CPU(unsigned int, KM);       /* Kernel/user mode */
  36 DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */
  37 DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */
  38 DEFINE_PER_CPU(unsigned int, CURRENT_SAVE);     /* Saved current pointer */
  39
  40 unsigned int boot_cpuid;
  41 char cmd_line[COMMAND_LINE_SIZE];
  42
  43 void __init setup_arch(char **cmdline_p)
  44 {
  45         *cmdline_p = cmd_line;
  46
  47         console_verbose();
  48
  49         unflatten_device_tree();
  50
  51         /* NOTE I think that this function is not necessary to call */
  52         /* irq_early_init(); */
  53         setup_cpuinfo();
  54
  55         __invalidate_icache_all();
  56         __enable_icache();
  57
  58         __invalidate_dcache_all();
  59         __enable_dcache();
  60
  61         panic_timeout = 120;
  62
  63         setup_memory();
  64
  65 #if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER)
  66         printk(KERN_NOTICE "Self modified code enable\n");
  67 #endif
  68
  69 #ifdef CONFIG_VT
  70 #if defined(CONFIG_XILINX_CONSOLE)
  71         conswitchp = &xil_con;
  72 #elif defined(CONFIG_DUMMY_CONSOLE)
  73         conswitchp = &dummy_con;
  74 #endif
  75 #endif
  76 }
  77
  78 #ifdef CONFIG_MTD_UCLINUX
  79 /* Handle both romfs and cramfs types, without generating unnecessary
  80  code (ie no point checking for CRAMFS if it's not even enabled) */
  81 inline unsigned get_romfs_len(unsigned *addr)
  82 {
  83 #ifdef CONFIG_ROMFS_FS
  84         if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
  85                 return be32_to_cpu(addr[2]);
  86 #endif
  87
  88 #ifdef CONFIG_CRAMFS
  89         if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
  90                 return le32_to_cpu(addr[1]);
  91 #endif
  92         return 0;
  93 }
  94 #endif  /* CONFIG_MTD_UCLINUX_EBSS */
  95
  96 void __init machine_early_init(const char *cmdline, unsigned int ram,
  97                 unsigned int fdt)
  98 {
  99         unsigned long *src, *dst = (unsigned long *)0x0;
 100
 101 /* clearing bss section */
 102         memset(__bss_start, 0, __bss_stop-__bss_start);
 103         memset(_ssbss, 0, _esbss-_ssbss);
 104
 105         /* Copy command line passed from bootloader */
 106 #ifndef CONFIG_CMDLINE_BOOL
 107         if (cmdline && cmdline[0] != '\0')
 108                 strlcpy(cmd_line, cmdline, COMMAND_LINE_SIZE);
 109 #endif
 110
 111 /* initialize device tree for usage in early_printk */
 112         early_init_devtree((void *)_fdt_start);
 113
 114 #ifdef CONFIG_EARLY_PRINTK
 115         setup_early_printk(NULL);
 116 #endif
 117
 118         early_printk("Ramdisk addr 0x%08x, FDT 0x%08x\n", ram, fdt);
 119         printk(KERN_NOTICE "Found FDT at 0x%08x\n", fdt);
 120
 121 #ifdef CONFIG_MTD_UCLINUX
 122         {
 123                 int size;
 124                 unsigned int romfs_base;
 125                 romfs_base = (ram ? ram : (unsigned int)&__init_end);
 126                 /* if CONFIG_MTD_UCLINUX_EBSS is defined, assume ROMFS is at the
 127                  * end of kernel, which is ROMFS_LOCATION defined above. */
 128                 size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
 129                 early_printk("Found romfs @ 0x%08x (0x%08x)\n",
 130                                 romfs_base, size);
 131                 early_printk("#### klimit %p ####\n", klimit);
 132                 BUG_ON(size < 0); /* What else can we do? */
 133
 134                 /* Use memmove to handle likely case of memory overlap */
 135                 early_printk("Moving 0x%08x bytes from 0x%08x to 0x%08x\n",
 136                         size, romfs_base, (unsigned)&_ebss);
 137                 memmove(&_ebss, (int *)romfs_base, size);
 138
 139                 /* update klimit */
 140                 klimit += PAGE_ALIGN(size);
 141                 early_printk("New klimit: 0x%08x\n", (unsigned)klimit);
 142         }
 143 #endif
 144
 145         for (src = __ivt_start; src < __ivt_end; src++, dst++)
 146                 *dst = *src;
 147
 148         /* Initialize global data */
 149         per_cpu(KM, 0) = 0x1;   /* We start in kernel mode */
 150         per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
 151 }
 152
 153 #ifdef CONFIG_DEBUG_FS
 154 struct dentry *of_debugfs_root;
 155
 156 static int microblaze_debugfs_init(void)
 157 {
 158         of_debugfs_root = debugfs_create_dir("microblaze", NULL);
 159
 160         return of_debugfs_root == NULL;
 161 }
 162 arch_initcall(microblaze_debugfs_init);
 163 #endif
 164
 165 void machine_restart(char *cmd)
 166 {
 167         printk(KERN_NOTICE "Machine restart...\n");
 168         dump_stack();
 169         while (1)
 170                 ;
 171 }
 172
 173 void machine_shutdown(void)
 174 {
 175         printk(KERN_NOTICE "Machine shutdown...\n");
 176         while (1)
 177                 ;
 178 }
 179
 180 void machine_halt(void)
 181 {
 182         printk(KERN_NOTICE "Machine halt...\n");
 183         while (1)
 184                 ;
 185 }
 186
 187 void machine_power_off(void)
 188 {
 189         printk(KERN_NOTICE "Machine power off...\n");
 190         while (1)
 191                 ;
 192 }