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
  39 DEFINE_PER_CPU(unsigned int, KSP);      /* Saved kernel stack pointer */
  40 DEFINE_PER_CPU(unsigned int, KM);       /* Kernel/user mode */
  41 DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */
  42 DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */
  43 DEFINE_PER_CPU(unsigned int, CURRENT_SAVE);     /* Saved current pointer */
  44
  45 unsigned 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  */
  51 char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data")));
  52
  53 void __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) */
  82 inline 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
  97 unsigned long kernel_tlb;
  98
  99 void __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         lockdep_init();
 134
 135 /* initialize device tree for usage in early_printk */
 136         early_init_devtree(_fdt_start);
 137
 138 #ifdef CONFIG_EARLY_PRINTK
 139         setup_early_printk(NULL);
 140 #endif
 141
 142         /* setup kernel_tlb after BSS cleaning
 143          * Maybe worth to move to asm code */
 144         kernel_tlb = tlb0 + tlb1;
 145         /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0,
 146                                                         tlb1, kernel_tlb); */
 147
 148         pr_info("Ramdisk addr 0x%08x, ", ram);
 149         if (fdt)
 150                 pr_info("FDT at 0x%08x\n", fdt);
 151         else
 152                 pr_info("Compiled-in FDT at %p\n", _fdt_start);
 153
 154 #ifdef CONFIG_MTD_UCLINUX
 155         pr_info("Found romfs @ 0x%08x (0x%08x)\n",
 156                         romfs_base, romfs_size);
 157         pr_info("#### klimit %p ####\n", old_klimit);
 158         BUG_ON(romfs_size < 0); /* What else can we do? */
 159
 160         pr_info("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
 161                         romfs_size, romfs_base, (unsigned)&__bss_stop);
 162
 163         pr_info("New klimit: 0x%08x\n", (unsigned)klimit);
 164 #endif
 165
 166 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
 167         if (msr) {
 168                 pr_info("!!!Your kernel has setup MSR instruction but ");
 169                 pr_cont("CPU don't have it %x\n", msr);
 170         }
 171 #else
 172         if (!msr) {
 173                 pr_info("!!!Your kernel not setup MSR instruction but ");
 174                 pr_cont("CPU have it %x\n", msr);
 175         }
 176 #endif
 177
 178         /* Do not copy reset vectors. offset = 0x2 means skip the first
 179          * two instructions. dst is pointer to MB vectors which are placed
 180          * in block ram. If you want to copy reset vector setup offset to 0x0 */
 181 #if !CONFIG_MANUAL_RESET_VECTOR
 182         offset = 0x2;
 183 #endif
 184         dst = (unsigned long *) (offset * sizeof(u32));
 185         for (src = __ivt_start + offset; src < __ivt_end; src++, dst++)
 186                 *dst = *src;
 187
 188         /* Initialize global data */
 189         per_cpu(KM, 0) = 0x1;   /* We start in kernel mode */
 190         per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
 191 }
 192
 193 void __init time_init(void)
 194 {
 195         of_clk_init(NULL);
 196         setup_cpuinfo_clk();
 197         clocksource_of_init();
 198 }
 199
 200 #ifdef CONFIG_DEBUG_FS
 201 struct dentry *of_debugfs_root;
 202
 203 static int microblaze_debugfs_init(void)
 204 {
 205         of_debugfs_root = debugfs_create_dir("microblaze", NULL);
 206
 207         return of_debugfs_root == NULL;
 208 }
 209 arch_initcall(microblaze_debugfs_init);
 210
 211 # ifdef CONFIG_MMU
 212 static int __init debugfs_tlb(void)
 213 {
 214         struct dentry *d;
 215
 216         if (!of_debugfs_root)
 217                 return -ENODEV;
 218
 219         d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
 220         if (!d)
 221                 return -ENOMEM;
 222
 223         return 0;
 224 }
 225 device_initcall(debugfs_tlb);
 226 # endif
 227 #endif