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
  20 #include <asm/setup.h>
  21 #include <asm/sections.h>
  22 #include <asm/page.h>
  23 #include <linux/io.h>
  24 #include <linux/bug.h>
  25 #include <linux/param.h>
  26 #include <linux/pci.h>
  27 #include <linux/cache.h>
  28 #include <linux/of_platform.h>
  29 #include <linux/dma-mapping.h>
  30 #include <asm/cacheflush.h>
  31 #include <asm/entry.h>
  32 #include <asm/cpuinfo.h>
  33
  34 #include <asm/prom.h>
  35 #include <asm/pgtable.h>
  36
  37 DEFINE_PER_CPU(unsigned int, KSP);      /* Saved kernel stack pointer */
  38 DEFINE_PER_CPU(unsigned int, KM);       /* Kernel/user mode */
  39 DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */
  40 DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */
  41 DEFINE_PER_CPU(unsigned int, CURRENT_SAVE);     /* Saved current pointer */
  42
  43 unsigned int boot_cpuid;
  44 /*
  45  * Placed cmd_line to .data section because can be initialized from
  46  * ASM code. Default position is BSS section which is cleared
  47  * in machine_early_init().
  48  */
  49 char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data")));
  50
  51 void __init setup_arch(char **cmdline_p)
  52 {
  53         *cmdline_p = cmd_line;
  54
  55         console_verbose();
  56
  57         unflatten_device_tree();
  58
  59         setup_cpuinfo();
  60
  61         microblaze_cache_init();
  62
  63         setup_memory();
  64
  65 #ifdef CONFIG_EARLY_PRINTK
  66         /* remap early console to virtual address */
  67         remap_early_printk();
  68 #endif
  69
  70         xilinx_pci_init();
  71
  72 #ifdef CONFIG_VT
  73 #if defined(CONFIG_XILINX_CONSOLE)
  74         conswitchp = &xil_con;
  75 #elif defined(CONFIG_DUMMY_CONSOLE)
  76         conswitchp = &dummy_con;
  77 #endif
  78 #endif
  79 }
  80
  81 #ifdef CONFIG_MTD_UCLINUX
  82 /* Handle both romfs and cramfs types, without generating unnecessary
  83  code (ie no point checking for CRAMFS if it's not even enabled) */
  84 inline unsigned get_romfs_len(unsigned *addr)
  85 {
  86 #ifdef CONFIG_ROMFS_FS
  87         if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
  88                 return be32_to_cpu(addr[2]);
  89 #endif
  90
  91 #ifdef CONFIG_CRAMFS
  92         if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
  93                 return le32_to_cpu(addr[1]);
  94 #endif
  95         return 0;
  96 }
  97 #endif  /* CONFIG_MTD_UCLINUX_EBSS */
  98
  99 unsigned long kernel_tlb;
 100
 101 void __init machine_early_init(const char *cmdline, unsigned int ram,
 102                 unsigned int fdt, unsigned int msr, unsigned int tlb0,
 103                 unsigned int tlb1)
 104 {
 105         unsigned long *src, *dst;
 106         unsigned int offset = 0;
 107
 108         /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the
 109          * end of kernel. There are two position which we want to check.
 110          * The first is __init_end and the second __bss_start.
 111          */
 112 #ifdef CONFIG_MTD_UCLINUX
 113         int romfs_size;
 114         unsigned int romfs_base;
 115         char *old_klimit = klimit;
 116
 117         romfs_base = (ram ? ram : (unsigned int)&__init_end);
 118         romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
 119         if (!romfs_size) {
 120                 romfs_base = (unsigned int)&__bss_start;
 121                 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
 122         }
 123
 124         /* Move ROMFS out of BSS before clearing it */
 125         if (romfs_size > 0) {
 126                 memmove(&__bss_stop, (int *)romfs_base, romfs_size);
 127                 klimit += romfs_size;
 128         }
 129 #endif
 130
 131 /* clearing bss section */
 132         memset(__bss_start, 0, __bss_stop-__bss_start);
 133         memset(_ssbss, 0, _esbss-_ssbss);
 134
 135         lockdep_init();
 136
 137 /* initialize device tree for usage in early_printk */
 138         early_init_devtree((void *)_fdt_start);
 139
 140 #ifdef CONFIG_EARLY_PRINTK
 141         setup_early_printk(NULL);
 142 #endif
 143
 144         /* setup kernel_tlb after BSS cleaning
 145          * Maybe worth to move to asm code */
 146         kernel_tlb = tlb0 + tlb1;
 147         /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0,
 148                                                         tlb1, kernel_tlb); */
 149
 150         pr_info("Ramdisk addr 0x%08x, ", ram);
 151         if (fdt)
 152                 pr_info("FDT at 0x%08x\n", fdt);
 153         else
 154                 pr_info("Compiled-in FDT at 0x%08x\n",
 155                                         (unsigned int)_fdt_start);
 156
 157 #ifdef CONFIG_MTD_UCLINUX
 158         pr_info("Found romfs @ 0x%08x (0x%08x)\n",
 159                         romfs_base, romfs_size);
 160         pr_info("#### klimit %p ####\n", old_klimit);
 161         BUG_ON(romfs_size < 0); /* What else can we do? */
 162
 163         pr_info("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
 164                         romfs_size, romfs_base, (unsigned)&__bss_stop);
 165
 166         pr_info("New klimit: 0x%08x\n", (unsigned)klimit);
 167 #endif
 168
 169 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
 170         if (msr) {
 171                 pr_info("!!!Your kernel has setup MSR instruction but ");
 172                 pr_cont("CPU don't have it %x\n", msr);
 173         }
 174 #else
 175         if (!msr) {
 176                 pr_info("!!!Your kernel not setup MSR instruction but ");
 177                 pr_cont"CPU have it %x\n", msr);
 178         }
 179 #endif
 180
 181         /* Do not copy reset vectors. offset = 0x2 means skip the first
 182          * two instructions. dst is pointer to MB vectors which are placed
 183          * in block ram. If you want to copy reset vector setup offset to 0x0 */
 184 #if !CONFIG_MANUAL_RESET_VECTOR
 185         offset = 0x2;
 186 #endif
 187         dst = (unsigned long *) (offset * sizeof(u32));
 188         for (src = __ivt_start + offset; src < __ivt_end; src++, dst++)
 189                 *dst = *src;
 190
 191         /* Initialize global data */
 192         per_cpu(KM, 0) = 0x1;   /* We start in kernel mode */
 193         per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
 194 }
 195
 196 void __init time_init(void)
 197 {
 198         clocksource_of_init();
 199 }
 200
 201 #ifdef CONFIG_DEBUG_FS
 202 struct dentry *of_debugfs_root;
 203
 204 static int microblaze_debugfs_init(void)
 205 {
 206         of_debugfs_root = debugfs_create_dir("microblaze", NULL);
 207
 208         return of_debugfs_root == NULL;
 209 }
 210 arch_initcall(microblaze_debugfs_init);
 211
 212 # ifdef CONFIG_MMU
 213 static int __init debugfs_tlb(void)
 214 {
 215         struct dentry *d;
 216
 217         if (!of_debugfs_root)
 218                 return -ENODEV;
 219
 220         d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
 221         if (!d)
 222                 return -ENOMEM;
 223
 224         return 0;
 225 }
 226 device_initcall(debugfs_tlb);
 227 # endif
 228 #endif
 229
 230 static int dflt_bus_notify(struct notifier_block *nb,
 231                                 unsigned long action, void *data)
 232 {
 233         struct device *dev = data;
 234
 235         /* We are only intereted in device addition */
 236         if (action != BUS_NOTIFY_ADD_DEVICE)
 237                 return 0;
 238
 239         set_dma_ops(dev, &dma_direct_ops);
 240
 241         return NOTIFY_DONE;
 242 }
 243
 244 static struct notifier_block dflt_plat_bus_notifier = {
 245         .notifier_call = dflt_bus_notify,
 246         .priority = INT_MAX,
 247 };
 248
 249 static int __init setup_bus_notifier(void)
 250 {
 251         bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier);
 252
 253         return 0;
 254 }
 255
 256 arch_initcall(setup_bus_notifier);