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 char *stdout;
  57
  58 int __init early_init_dt_scan_chosen_serial(unsigned long node,
  59                                 const char *uname, int depth, void *data)
  60 {
  61         unsigned long l;
  62         char *p;
  63
  64         pr_debug("%s: depth: %d, uname: %s\n", __func__, depth, uname);
  65
  66         if (depth == 1 && (strcmp(uname, "chosen") == 0 ||
  67                                 strcmp(uname, "chosen@0") == 0)) {
  68                 p = of_get_flat_dt_prop(node, "linux,stdout-path", &l);
  69                 if (p != NULL && l > 0)
  70                         stdout = p; /* store pointer to stdout-path */
  71         }
  72
  73         if (stdout && strstr(stdout, uname)) {
  74                 p = of_get_flat_dt_prop(node, "compatible", &l);
  75                 pr_debug("Compatible string: %s\n", p);
  76
  77                 if ((strncmp(p, "xlnx,xps-uart16550", 18) == 0) ||
  78                         (strncmp(p, "xlnx,axi-uart16550", 18) == 0)) {
  79                         unsigned int addr;
  80
  81                         *(u32 *)data = UART16550;
  82
  83                         addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l);
  84                         addr += *(u32 *)of_get_flat_dt_prop(node,
  85                                                         "reg-offset", &l);
  86                         /* clear register offset */
  87                         return be32_to_cpu(addr) & ~3;
  88                 }
  89                 if ((strncmp(p, "xlnx,xps-uartlite", 17) == 0) ||
  90                                 (strncmp(p, "xlnx,opb-uartlite", 17) == 0) ||
  91                                 (strncmp(p, "xlnx,axi-uartlite", 17) == 0) ||
  92                                 (strncmp(p, "xlnx,mdm", 8) == 0)) {
  93                         unsigned int *addrp;
  94
  95                         *(u32 *)data = UARTLITE;
  96
  97                         addrp = of_get_flat_dt_prop(node, "reg", &l);
  98                         return be32_to_cpup(addrp); /* return address */
  99                 }
 100         }
 101         return 0;
 102 }
 103
 104 /* this function is looking for early console - Microblaze specific */
 105 int __init of_early_console(void *version)
 106 {
 107         return of_scan_flat_dt(early_init_dt_scan_chosen_serial, version);
 108 }
 109 #endif
 110
 111 void __init early_init_devtree(void *params)
 112 {
 113         pr_debug(" -> early_init_devtree(%p)\n", params);
 114
 115         /* Setup flat device-tree pointer */
 116         initial_boot_params = params;
 117
 118         /* Retrieve various informations from the /chosen node of the
 119          * device-tree, including the platform type, initrd location and
 120          * size, TCE reserve, and more ...
 121          */
 122         of_scan_flat_dt(early_init_dt_scan_chosen, cmd_line);
 123
 124         /* Scan memory nodes and rebuild MEMBLOCKs */
 125         memblock_init();
 126         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 127         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
 128
 129         /* Save command line for /proc/cmdline and then parse parameters */
 130         strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
 131         parse_early_param();
 132
 133         memblock_analyze();
 134
 135         pr_debug("Phys. mem: %lx\n", (unsigned long) memblock_phys_mem_size());
 136
 137         pr_debug(" <- early_init_devtree()\n");
 138 }
 139
 140 #ifdef CONFIG_BLK_DEV_INITRD
 141 void __init early_init_dt_setup_initrd_arch(unsigned long start,
 142                 unsigned long end)
 143 {
 144         initrd_start = (unsigned long)__va(start);
 145         initrd_end = (unsigned long)__va(end);
 146         initrd_below_start_ok = 1;
 147 }
 148 #endif
 149
 150 /*******
 151  *
 152  * New implementation of the OF "find" APIs, return a refcounted
 153  * object, call of_node_put() when done.  The device tree and list
 154  * are protected by a rw_lock.
 155  *
 156  * Note that property management will need some locking as well,
 157  * this isn't dealt with yet.
 158  *
 159  *******/
 160
 161 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
 162 static struct debugfs_blob_wrapper flat_dt_blob;
 163
 164 static int __init export_flat_device_tree(void)
 165 {
 166         struct dentry *d;
 167
 168         flat_dt_blob.data = initial_boot_params;
 169         flat_dt_blob.size = initial_boot_params->totalsize;
 170
 171         d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
 172                                 of_debugfs_root, &flat_dt_blob);
 173         if (!d)
 174                 return 1;
 175
 176         return 0;
 177 }
 178 device_initcall(export_flat_device_tree);
 179 #endif