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_add_memory_arch(u64 base, u64 size)
  46 {
  47         memblock_add(base, size);
  48 }
  49
  50 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
  51 {
  52         return __va(memblock_alloc(size, align));
  53 }
  54
  55 #ifdef CONFIG_EARLY_PRINTK
  56 /* MS this is Microblaze specifig function */
  57 static int __init early_init_dt_scan_serial(unsigned long node,
  58                                 const char *uname, int depth, void *data)
  59 {
  60         unsigned long l;
  61         char *p;
  62         const __be32 *addr;
  63
  64         pr_debug("search \"serial\", depth: %d, uname: %s\n", depth, uname);
  65
  66 /* find all serial nodes */
  67         if (strncmp(uname, "serial", 6) != 0)
  68                 return 0;
  69
  70 /* find compatible node with uartlite */
  71         p = of_get_flat_dt_prop(node, "compatible", &l);
  72         if ((strncmp(p, "xlnx,xps-uartlite", 17) != 0) &&
  73                         (strncmp(p, "xlnx,opb-uartlite", 17) != 0) &&
  74                         (strncmp(p, "xlnx,axi-uartlite", 17) != 0))
  75                 return 0;
  76
  77         addr = of_get_flat_dt_prop(node, "reg", &l);
  78         return be32_to_cpup(addr); /* return address */
  79 }
  80
  81 /* this function is looking for early uartlite console - Microblaze specific */
  82 int __init early_uartlite_console(void)
  83 {
  84         return of_scan_flat_dt(early_init_dt_scan_serial, NULL);
  85 }
  86
  87 /* MS this is Microblaze specifig function */
  88 static int __init early_init_dt_scan_serial_full(unsigned long node,
  89                                 const char *uname, int depth, void *data)
  90 {
  91         unsigned long l;
  92         char *p;
  93         unsigned int addr;
  94
  95         pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
  96
  97 /* find all serial nodes */
  98         if (strncmp(uname, "serial", 6) != 0)
  99                 return 0;
 100
 101         early_init_dt_check_for_initrd(node);
 102
 103 /* find compatible node with uartlite */
 104         p = of_get_flat_dt_prop(node, "compatible", &l);
 105
 106         if ((strncmp(p, "xlnx,xps-uart16550", 18) != 0) &&
 107                 (strncmp(p, "xlnx,axi-uart16550", 18) != 0))
 108                 return 0;
 109
 110         addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l);
 111         addr += *(u32 *)of_get_flat_dt_prop(node, "reg-offset", &l);
 112         return be32_to_cpu(addr); /* return address */
 113 }
 114
 115 /* this function is looking for early uartlite console - Microblaze specific */
 116 int __init early_uart16550_console(void)
 117 {
 118         return of_scan_flat_dt(early_init_dt_scan_serial_full, NULL);
 119 }
 120 #endif
 121
 122 void __init early_init_devtree(void *params)
 123 {
 124         pr_debug(" -> early_init_devtree(%p)\n", params);
 125
 126         /* Setup flat device-tree pointer */
 127         initial_boot_params = params;
 128
 129         /* Retrieve various informations from the /chosen node of the
 130          * device-tree, including the platform type, initrd location and
 131          * size, TCE reserve, and more ...
 132          */
 133         of_scan_flat_dt(early_init_dt_scan_chosen, cmd_line);
 134
 135         /* Scan memory nodes and rebuild MEMBLOCKs */
 136         memblock_init();
 137         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 138         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
 139
 140         /* Save command line for /proc/cmdline and then parse parameters */
 141         strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
 142         parse_early_param();
 143
 144         memblock_analyze();
 145
 146         pr_debug("Phys. mem: %lx\n", (unsigned long) memblock_phys_mem_size());
 147
 148         pr_debug(" <- early_init_devtree()\n");
 149 }
 150
 151 #ifdef CONFIG_BLK_DEV_INITRD
 152 void __init early_init_dt_setup_initrd_arch(unsigned long start,
 153                 unsigned long end)
 154 {
 155         initrd_start = (unsigned long)__va(start);
 156         initrd_end = (unsigned long)__va(end);
 157         initrd_below_start_ok = 1;
 158 }
 159 #endif
 160
 161 /*******
 162  *
 163  * New implementation of the OF "find" APIs, return a refcounted
 164  * object, call of_node_put() when done.  The device tree and list
 165  * are protected by a rw_lock.
 166  *
 167  * Note that property management will need some locking as well,
 168  * this isn't dealt with yet.
 169  *
 170  *******/
 171
 172 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
 173 static struct debugfs_blob_wrapper flat_dt_blob;
 174
 175 static int __init export_flat_device_tree(void)
 176 {
 177         struct dentry *d;
 178
 179         flat_dt_blob.data = initial_boot_params;
 180         flat_dt_blob.size = initial_boot_params->totalsize;
 181
 182         d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
 183                                 of_debugfs_root, &flat_dt_blob);
 184         if (!d)
 185                 return 1;
 186
 187         return 0;
 188 }
 189 device_initcall(export_flat_device_tree);
 190 #endif