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/clocksource.h>
  13 #include <linux/string.h>
  14 #include <linux/seq_file.h>
  15 #include <linux/cpu.h>
  16 #include <linux/initrd.h>
  17 #include <linux/console.h>
  18 #include <linux/debugfs.h>
  19 #include <linux/of_fdt.h>
  20
  21 #include <asm/setup.h>
  22 #include <asm/sections.h>
  23 #include <asm/page.h>
  24 #include <linux/io.h>
  25 #include <linux/bug.h>
  26 #include <linux/param.h>
  27 #include <linux/pci.h>
  28 #include <linux/cache.h>
  29 #include <linux/of_platform.h>
  30 #include <linux/dma-mapping.h>
  31 #include <asm/cacheflush.h>
  32 #include <asm/entry.h>
  33 #include <asm/cpuinfo.h>
  34
  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 /*
  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         console_verbose();
  57
  58         unflatten_device_tree();
  59
  60         setup_cpuinfo();
  61
  62         microblaze_cache_init();
  63
  64         setup_memory();
  65
  66 #ifdef CONFIG_EARLY_PRINTK
  67         /* remap early console to virtual address */
  68         remap_early_printk();
  69 #endif
  70
  71         xilinx_pci_init();
  72
  73 #ifdef CONFIG_VT
  74 #if defined(CONFIG_XILINX_CONSOLE)
  75         conswitchp = &xil_con;
  76 #elif defined(CONFIG_DUMMY_CONSOLE)
  77         conswitchp = &dummy_con;
  78 #endif
  79 #endif
  80 }
  81
  82 #ifdef CONFIG_MTD_UCLINUX
  83 /* Handle both romfs and cramfs types, without generating unnecessary
  84  code (ie no point checking for CRAMFS if it's not even enabled) */
  85 inline unsigned get_romfs_len(unsigned *addr)
  86 {
  87 #ifdef CONFIG_ROMFS_FS
  88         if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
  89                 return be32_to_cpu(addr[2]);
  90 #endif
  91
  92 #ifdef CONFIG_CRAMFS
  93         if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
  94                 return le32_to_cpu(addr[1]);
  95 #endif
  96         return 0;
  97 }
  98 #endif  /* CONFIG_MTD_UCLINUX_EBSS */
  99
 100 unsigned long kernel_tlb;
 101
 102 void __init machine_early_init(const char *cmdline, unsigned int ram,
 103                 unsigned int fdt, unsigned int msr, unsigned int tlb0,
 104                 unsigned int tlb1)
 105 {
 106         unsigned long *src, *dst;
 107         unsigned int offset = 0;
 108
 109         /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the
 110          * end of kernel. There are two position which we want to check.
 111          * The first is __init_end and the second __bss_start.
 112          */
 113 #ifdef CONFIG_MTD_UCLINUX
 114         int romfs_size;
 115         unsigned int romfs_base;
 116         char *old_klimit = klimit;
 117
 118         romfs_base = (ram ? ram : (unsigned int)&__init_end);
 119         romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
 120         if (!romfs_size) {
 121                 romfs_base = (unsigned int)&__bss_start;
 122                 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
 123         }
 124
 125         /* Move ROMFS out of BSS before clearing it */
 126         if (romfs_size > 0) {
 127                 memmove(&__bss_stop, (int *)romfs_base, romfs_size);
 128                 klimit += romfs_size;
 129         }
 130 #endif
 131
 132 /* clearing bss section */
 133         memset(__bss_start, 0, __bss_stop-__bss_start);
 134         memset(_ssbss, 0, _esbss-_ssbss);
 135
 136         lockdep_init();
 137
 138 /* initialize device tree for usage in early_printk */
 139         early_init_devtree((void *)_fdt_start);
 140
 141 #ifdef CONFIG_EARLY_PRINTK
 142         setup_early_printk(NULL);
 143 #endif
 144
 145         /* setup kernel_tlb after BSS cleaning
 146          * Maybe worth to move to asm code */
 147         kernel_tlb = tlb0 + tlb1;
 148         /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0,
 149                                                         tlb1, kernel_tlb); */
 150
 151         pr_info("Ramdisk addr 0x%08x, ", ram);
 152         if (fdt)
 153                 pr_info("FDT at 0x%08x\n", fdt);
 154         else
 155                 pr_info("Compiled-in FDT at 0x%08x\n",
 156                                         (unsigned int)_fdt_start);
 157
 158 #ifdef CONFIG_MTD_UCLINUX
 159         pr_info("Found romfs @ 0x%08x (0x%08x)\n",
 160                         romfs_base, romfs_size);
 161         pr_info("#### klimit %p ####\n", old_klimit);
 162         BUG_ON(romfs_size < 0); /* What else can we do? */
 163
 164         pr_info("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
 165                         romfs_size, romfs_base, (unsigned)&__bss_stop);
 166
 167         pr_info("New klimit: 0x%08x\n", (unsigned)klimit);
 168 #endif
 169
 170 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
 171         if (msr) {
 172                 pr_info("!!!Your kernel has setup MSR instruction but ");
 173                 pr_cont("CPU don't have it %x\n", msr);
 174         }
 175 #else
 176         if (!msr) {
 177                 pr_info("!!!Your kernel not setup MSR instruction but ");
 178                 pr_cont"CPU have it %x\n", msr);
 179         }
 180 #endif
 181
 182         /* Do not copy reset vectors. offset = 0x2 means skip the first
 183          * two instructions. dst is pointer to MB vectors which are placed
 184          * in block ram. If you want to copy reset vector setup offset to 0x0 */
 185 #if !CONFIG_MANUAL_RESET_VECTOR
 186         offset = 0x2;
 187 #endif
 188         dst = (unsigned long *) (offset * sizeof(u32));
 189         for (src = __ivt_start + offset; src < __ivt_end; src++, dst++)
 190                 *dst = *src;
 191
 192         /* Initialize global data */
 193         per_cpu(KM, 0) = 0x1;   /* We start in kernel mode */
 194         per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
 195 }
 196
 197 void __init time_init(void)
 198 {
 199         clocksource_of_init();
 200 }
 201
 202 #ifdef CONFIG_DEBUG_FS
 203 struct dentry *of_debugfs_root;
 204
 205 static int microblaze_debugfs_init(void)
 206 {
 207         of_debugfs_root = debugfs_create_dir("microblaze", NULL);
 208
 209         return of_debugfs_root == NULL;
 210 }
 211 arch_initcall(microblaze_debugfs_init);
 212
 213 # ifdef CONFIG_MMU
 214 static int __init debugfs_tlb(void)
 215 {
 216         struct dentry *d;
 217
 218         if (!of_debugfs_root)
 219                 return -ENODEV;
 220
 221         d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
 222         if (!d)
 223                 return -ENOMEM;
 224
 225         return 0;
 226 }
 227 device_initcall(debugfs_tlb);
 228 # endif
 229 #endif
 230
 231 static int dflt_bus_notify(struct notifier_block *nb,
 232                                 unsigned long action, void *data)
 233 {
 234         struct device *dev = data;
 235
 236         /* We are only intereted in device addition */
 237         if (action != BUS_NOTIFY_ADD_DEVICE)
 238                 return 0;
 239
 240         set_dma_ops(dev, &dma_direct_ops);
 241
 242         return NOTIFY_DONE;
 243 }
 244
 245 static struct notifier_block dflt_plat_bus_notifier = {
 246         .notifier_call = dflt_bus_notify,
 247         .priority = INT_MAX,
 248 };
 249
 250 static int __init setup_bus_notifier(void)
 251 {
 252         bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier);
 253
 254         return 0;
 255 }
 256
 257 arch_initcall(setup_bus_notifier);