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
  36 DEFINE_PER_CPU(unsigned int, KSP);      /* Saved kernel stack pointer */
  37 DEFINE_PER_CPU(unsigned int, KM);       /* Kernel/user mode */
  38 DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */
  39 DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */
  40 DEFINE_PER_CPU(unsigned int, CURRENT_SAVE);     /* Saved current pointer */
  41
  42 unsigned int boot_cpuid;
  43 char cmd_line[COMMAND_LINE_SIZE];
  44
  45 void __init setup_arch(char **cmdline_p)
  46 {
  47         *cmdline_p = cmd_line;
  48
  49         console_verbose();
  50
  51         unflatten_device_tree();
  52
  53         setup_cpuinfo();
  54
  55         microblaze_cache_init();
  56
  57         setup_memory();
  58
  59 #ifdef CONFIG_EARLY_PRINTK
  60         /* remap early console to virtual address */
  61         remap_early_printk();
  62 #endif
  63
  64         xilinx_pci_init();
  65
  66 #if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER)
  67         printk(KERN_NOTICE "Self modified code enable\n");
  68 #endif
  69
  70 #ifdef CONFIG_VT
  71 #if defined(CONFIG_XILINX_CONSOLE)
  72         conswitchp = &xil_con;
  73 #elif defined(CONFIG_DUMMY_CONSOLE)
  74         conswitchp = &dummy_con;
  75 #endif
  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         /* Copy command line passed from bootloader */
 134 #ifndef CONFIG_CMDLINE_BOOL
 135         if (cmdline && cmdline[0] != '\0')
 136                 strlcpy(cmd_line, cmdline, COMMAND_LINE_SIZE);
 137 #endif
 138
 139         lockdep_init();
 140
 141 /* initialize device tree for usage in early_printk */
 142         early_init_devtree((void *)_fdt_start);
 143
 144 #ifdef CONFIG_EARLY_PRINTK
 145         setup_early_printk(NULL);
 146 #endif
 147
 148         /* setup kernel_tlb after BSS cleaning
 149          * Maybe worth to move to asm code */
 150         kernel_tlb = tlb0 + tlb1;
 151         /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0,
 152                                                         tlb1, kernel_tlb); */
 153
 154         printk("Ramdisk addr 0x%08x, ", ram);
 155         if (fdt)
 156                 printk("FDT at 0x%08x\n", fdt);
 157         else
 158                 printk("Compiled-in FDT at 0x%08x\n",
 159                                         (unsigned int)_fdt_start);
 160
 161 #ifdef CONFIG_MTD_UCLINUX
 162         printk("Found romfs @ 0x%08x (0x%08x)\n",
 163                         romfs_base, romfs_size);
 164         printk("#### klimit %p ####\n", old_klimit);
 165         BUG_ON(romfs_size < 0); /* What else can we do? */
 166
 167         printk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
 168                         romfs_size, romfs_base, (unsigned)&__bss_stop);
 169
 170         printk("New klimit: 0x%08x\n", (unsigned)klimit);
 171 #endif
 172
 173 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
 174         if (msr)
 175                 printk("!!!Your kernel has setup MSR instruction but "
 176                                 "CPU don't have it %x\n", msr);
 177 #else
 178         if (!msr)
 179                 printk("!!!Your kernel not setup MSR instruction but "
 180                                 "CPU have it %x\n", msr);
 181 #endif
 182
 183         /* Do not copy reset vectors. offset = 0x2 means skip the first
 184          * two instructions. dst is pointer to MB vectors which are placed
 185          * in block ram. If you want to copy reset vector setup offset to 0x0 */
 186 #if !CONFIG_MANUAL_RESET_VECTOR
 187         offset = 0x2;
 188 #endif
 189         dst = (unsigned long *) (offset * sizeof(u32));
 190         for (src = __ivt_start + offset; src < __ivt_end; src++, dst++)
 191                 *dst = *src;
 192
 193         /* Initialize global data */
 194         per_cpu(KM, 0) = 0x1;   /* We start in kernel mode */
 195         per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
 196 }
 197
 198 #ifdef CONFIG_DEBUG_FS
 199 struct dentry *of_debugfs_root;
 200
 201 static int microblaze_debugfs_init(void)
 202 {
 203         of_debugfs_root = debugfs_create_dir("microblaze", NULL);
 204
 205         return of_debugfs_root == NULL;
 206 }
 207 arch_initcall(microblaze_debugfs_init);
 208
 209 # ifdef CONFIG_MMU
 210 static int __init debugfs_tlb(void)
 211 {
 212         struct dentry *d;
 213
 214         if (!of_debugfs_root)
 215                 return -ENODEV;
 216
 217         d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
 218         if (!d)
 219                 return -ENOMEM;
 220 }
 221 device_initcall(debugfs_tlb);
 222 # endif
 223 #endif
 224
 225 static int dflt_bus_notify(struct notifier_block *nb,
 226                                 unsigned long action, void *data)
 227 {
 228         struct device *dev = data;
 229
 230         /* We are only intereted in device addition */
 231         if (action != BUS_NOTIFY_ADD_DEVICE)
 232                 return 0;
 233
 234         set_dma_ops(dev, &dma_direct_ops);
 235
 236         return NOTIFY_DONE;
 237 }
 238
 239 static struct notifier_block dflt_plat_bus_notifier = {
 240         .notifier_call = dflt_bus_notify,
 241         .priority = INT_MAX,
 242 };
 243
 244 static int __init setup_bus_notifier(void)
 245 {
 246         bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier);
 247
 248         return 0;
 249 }
 250
 251 arch_initcall(setup_bus_notifier);