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
  38 DEFINE_PER_CPU(unsigned int, KSP);      /* Saved kernel stack pointer */
  39 DEFINE_PER_CPU(unsigned int, KM);       /* Kernel/user mode */
  40 DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */
  41 DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */
  42 DEFINE_PER_CPU(unsigned int, CURRENT_SAVE);     /* Saved current pointer */
  43
  44 unsigned 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  */
  50 char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data")));
  51
  52 void __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) */
  77 inline 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
  92 unsigned long kernel_tlb;
  93
  94 void __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
 182 void __init time_init(void)
 183 {
 184         of_clk_init(NULL);
 185         setup_cpuinfo_clk();
 186         timer_probe();
 187 }
 188
 189 #ifdef CONFIG_DEBUG_FS
 190 struct dentry *of_debugfs_root;
 191
 192 static int microblaze_debugfs_init(void)
 193 {
 194         of_debugfs_root = debugfs_create_dir("microblaze", NULL);
 195         return 0;
 196 }
 197 arch_initcall(microblaze_debugfs_init);
 198
 199 # ifdef CONFIG_MMU
 200 static int __init debugfs_tlb(void)
 201 {
 202         debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
 203         return 0;
 204 }
 205 device_initcall(debugfs_tlb);
 206 # endif
 207 #endif