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