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 <linux/cpu.h>
  30 #include <asm/cacheflush.h>
  31 #include <asm/entry.h>
  32 #include <asm/cpuinfo.h>
  33
  34 #include <asm/system.h>
  35 #include <asm/prom.h>
  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 char cmd_line[COMMAND_LINE_SIZE];
  46
  47 void __init setup_arch(char **cmdline_p)
  48 {
  49         *cmdline_p = cmd_line;
  50
  51         console_verbose();
  52
  53         unflatten_device_tree();
  54
  55         /* NOTE I think that this function is not necessary to call */
  56         /* irq_early_init(); */
  57         setup_cpuinfo();
  58
  59         microblaze_cache_init();
  60
  61         setup_memory();
  62
  63 #ifdef CONFIG_EARLY_PRINTK
  64         /* remap early console to virtual address */
  65         remap_early_printk();
  66 #endif
  67
  68         xilinx_pci_init();
  69
  70 #if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER)
  71         printk(KERN_NOTICE "Self modified code enable\n");
  72 #endif
  73
  74 #ifdef CONFIG_VT
  75 #if defined(CONFIG_XILINX_CONSOLE)
  76         conswitchp = &xil_con;
  77 #elif defined(CONFIG_DUMMY_CONSOLE)
  78         conswitchp = &dummy_con;
  79 #endif
  80 #endif
  81 }
  82
  83 #ifdef CONFIG_MTD_UCLINUX
  84 /* Handle both romfs and cramfs types, without generating unnecessary
  85  code (ie no point checking for CRAMFS if it's not even enabled) */
  86 inline unsigned get_romfs_len(unsigned *addr)
  87 {
  88 #ifdef CONFIG_ROMFS_FS
  89         if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
  90                 return be32_to_cpu(addr[2]);
  91 #endif
  92
  93 #ifdef CONFIG_CRAMFS
  94         if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
  95                 return le32_to_cpu(addr[1]);
  96 #endif
  97         return 0;
  98 }
  99 #endif  /* CONFIG_MTD_UCLINUX_EBSS */
 100
 101 void __init machine_early_init(const char *cmdline, unsigned int ram,
 102                 unsigned int fdt, unsigned int msr)
 103 {
 104         unsigned long *src, *dst;
 105         unsigned int offset = 0;
 106
 107         /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the
 108          * end of kernel. There are two position which we want to check.
 109          * The first is __init_end and the second __bss_start.
 110          */
 111 #ifdef CONFIG_MTD_UCLINUX
 112         int romfs_size;
 113         unsigned int romfs_base;
 114         char *old_klimit = klimit;
 115
 116         romfs_base = (ram ? ram : (unsigned int)&__init_end);
 117         romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
 118         if (!romfs_size) {
 119                 romfs_base = (unsigned int)&__bss_start;
 120                 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
 121         }
 122
 123         /* Move ROMFS out of BSS before clearing it */
 124         if (romfs_size > 0) {
 125                 memmove(&_ebss, (int *)romfs_base, romfs_size);
 126                 klimit += romfs_size;
 127         }
 128 #endif
 129
 130 /* clearing bss section */
 131         memset(__bss_start, 0, __bss_stop-__bss_start);
 132         memset(_ssbss, 0, _esbss-_ssbss);
 133
 134         /* Copy command line passed from bootloader */
 135 #ifndef CONFIG_CMDLINE_BOOL
 136         if (cmdline && cmdline[0] != '\0')
 137                 strlcpy(cmd_line, cmdline, COMMAND_LINE_SIZE);
 138 #endif
 139
 140         lockdep_init();
 141
 142 /* initialize device tree for usage in early_printk */
 143         early_init_devtree((void *)_fdt_start);
 144
 145 #ifdef CONFIG_EARLY_PRINTK
 146         setup_early_printk(NULL);
 147 #endif
 148
 149         printk("Ramdisk addr 0x%08x, ", ram);
 150         if (fdt)
 151                 printk("FDT at 0x%08x\n", fdt);
 152         else
 153                 printk("Compiled-in FDT at 0x%08x\n",
 154                                         (unsigned int)_fdt_start);
 155
 156 #ifdef CONFIG_MTD_UCLINUX
 157         printk("Found romfs @ 0x%08x (0x%08x)\n",
 158                         romfs_base, romfs_size);
 159         printk("#### klimit %p ####\n", old_klimit);
 160         BUG_ON(romfs_size < 0); /* What else can we do? */
 161
 162         printk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
 163                         romfs_size, romfs_base, (unsigned)&_ebss);
 164
 165         printk("New klimit: 0x%08x\n", (unsigned)klimit);
 166 #endif
 167
 168 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
 169         if (msr)
 170                 printk("!!!Your kernel has setup MSR instruction but "
 171                                 "CPU don't have it %x\n", msr);
 172 #else
 173         if (!msr)
 174                 printk("!!!Your kernel not setup MSR instruction but "
 175                                 "CPU have it %x\n", msr);
 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 #ifdef CONFIG_DEBUG_FS
 194 struct dentry *of_debugfs_root;
 195
 196 static int microblaze_debugfs_init(void)
 197 {
 198         of_debugfs_root = debugfs_create_dir("microblaze", NULL);
 199
 200         return of_debugfs_root == NULL;
 201 }
 202 arch_initcall(microblaze_debugfs_init);
 203 #endif
 204
 205 static int dflt_bus_notify(struct notifier_block *nb,
 206                                 unsigned long action, void *data)
 207 {
 208         struct device *dev = data;
 209
 210         /* We are only intereted in device addition */
 211         if (action != BUS_NOTIFY_ADD_DEVICE)
 212                 return 0;
 213
 214         set_dma_ops(dev, &dma_direct_ops);
 215
 216         return NOTIFY_DONE;
 217 }
 218
 219 static struct notifier_block dflt_plat_bus_notifier = {
 220         .notifier_call = dflt_bus_notify,
 221         .priority = INT_MAX,
 222 };
 223
 224 static int __init setup_bus_notifier(void)
 225 {
 226         bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier);
 227
 228         return 0;
 229 }
 230 arch_initcall(setup_bus_notifier);
 231
 232 static DEFINE_PER_CPU(struct cpu, cpu_devices);
 233
 234 static int __init topology_init(void)
 235 {
 236         int i, ret;
 237
 238         for_each_present_cpu(i) {
 239                 struct cpu *c = &per_cpu(cpu_devices, i);
 240
 241                 ret = register_cpu(c, i);
 242                 if (ret)
 243                         printk(KERN_WARNING "topology_init: register_cpu %d "
 244                                                 "failed (%d)\n", i, ret);
 245         }
 246
 247         return 0;
 248 }
 249 subsys_initcall(topology_init);