release/src-rt-6.x.4708/linux/linux-2.6.36/arch/microblaze/kernel/prom.c

   1 /*
   2  * Procedures for creating, accessing and interpreting the device tree.
   3  *
   4  * Paul Mackerras       August 1996.
   5  * Copyright (C) 1996-2005 Paul Mackerras.
   6  *
   7  *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
   8  *    {engebret|bergner}@us.ibm.com
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 #include <stdarg.h>
  17 #include <linux/kernel.h>
  18 #include <linux/string.h>
  19 #include <linux/init.h>
  20 #include <linux/threads.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/types.h>
  23 #include <linux/pci.h>
  24 #include <linux/stringify.h>
  25 #include <linux/delay.h>
  26 #include <linux/initrd.h>
  27 #include <linux/bitops.h>
  28 #include <linux/module.h>
  29 #include <linux/kexec.h>
  30 #include <linux/debugfs.h>
  31 #include <linux/irq.h>
  32 #include <linux/memblock.h>
  33
  34 #include <asm/prom.h>
  35 #include <asm/page.h>
  36 #include <asm/processor.h>
  37 #include <asm/irq.h>
  38 #include <linux/io.h>
  39 #include <asm/system.h>
  40 #include <asm/mmu.h>
  41 #include <asm/pgtable.h>
  42 #include <asm/sections.h>
  43 #include <asm/pci-bridge.h>
  44
  45 void __init early_init_dt_scan_chosen_arch(unsigned long node)
  46 {
  47         /* No Microblaze specific code here */
  48 }
  49
  50 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
  51 {
  52         memblock_add(base, size);
  53 }
  54
  55 u64 __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
  56 {
  57         return memblock_alloc(size, align);
  58 }
  59
  60 #ifdef CONFIG_EARLY_PRINTK
  61 /* MS this is Microblaze specifig function */
  62 static int __init early_init_dt_scan_serial(unsigned long node,
  63                                 const char *uname, int depth, void *data)
  64 {
  65         unsigned long l;
  66         char *p;
  67         int *addr;
  68
  69         pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
  70
  71 /* find all serial nodes */
  72         if (strncmp(uname, "serial", 6) != 0)
  73                 return 0;
  74
  75         early_init_dt_check_for_initrd(node);
  76
  77 /* find compatible node with uartlite */
  78         p = of_get_flat_dt_prop(node, "compatible", &l);
  79         if ((strncmp(p, "xlnx,xps-uartlite", 17) != 0) &&
  80                         (strncmp(p, "xlnx,opb-uartlite", 17) != 0))
  81                 return 0;
  82
  83         addr = of_get_flat_dt_prop(node, "reg", &l);
  84         return *addr; /* return address */
  85 }
  86
  87 /* this function is looking for early uartlite console - Microblaze specific */
  88 int __init early_uartlite_console(void)
  89 {
  90         return of_scan_flat_dt(early_init_dt_scan_serial, NULL);
  91 }
  92 #endif
  93
  94 void __init early_init_devtree(void *params)
  95 {
  96         pr_debug(" -> early_init_devtree(%p)\n", params);
  97
  98         /* Setup flat device-tree pointer */
  99         initial_boot_params = params;
 100
 101         /* Retrieve various informations from the /chosen node of the
 102          * device-tree, including the platform type, initrd location and
 103          * size, TCE reserve, and more ...
 104          */
 105         of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
 106
 107         /* Scan memory nodes and rebuild MEMBLOCKs */
 108         memblock_init();
 109         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 110         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
 111
 112         /* Save command line for /proc/cmdline and then parse parameters */
 113         strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
 114         parse_early_param();
 115
 116         memblock_analyze();
 117
 118         pr_debug("Phys. mem: %lx\n", (unsigned long) memblock_phys_mem_size());
 119
 120         pr_debug(" <- early_init_devtree()\n");
 121 }
 122
 123 #ifdef CONFIG_BLK_DEV_INITRD
 124 void __init early_init_dt_setup_initrd_arch(unsigned long start,
 125                 unsigned long end)
 126 {
 127         initrd_start = (unsigned long)__va(start);
 128         initrd_end = (unsigned long)__va(end);
 129         initrd_below_start_ok = 1;
 130 }
 131 #endif
 132
 133 /*******
 134  *
 135  * New implementation of the OF "find" APIs, return a refcounted
 136  * object, call of_node_put() when done.  The device tree and list
 137  * are protected by a rw_lock.
 138  *
 139  * Note that property management will need some locking as well,
 140  * this isn't dealt with yet.
 141  *
 142  *******/
 143
 144 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
 145 static struct debugfs_blob_wrapper flat_dt_blob;
 146
 147 static int __init export_flat_device_tree(void)
 148 {
 149         struct dentry *d;
 150
 151         flat_dt_blob.data = initial_boot_params;
 152         flat_dt_blob.size = initial_boot_params->totalsize;
 153
 154         d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
 155                                 of_debugfs_root, &flat_dt_blob);
 156         if (!d)
 157                 return 1;
 158
 159         return 0;
 160 }
 161 device_initcall(export_flat_device_tree);
 162 #endif