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/mmu.h>
  40 #include <asm/pgtable.h>
  41 #include <asm/sections.h>
  42 #include <asm/pci-bridge.h>
  43
  44 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
  45 {
  46         memblock_add(base, size);
  47 }
  48
  49 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
  50 {
  51         return __va(memblock_alloc(size, align));
  52 }
  53
  54 #ifdef CONFIG_EARLY_PRINTK
  55 char *stdout;
  56
  57 int __init early_init_dt_scan_chosen_serial(unsigned long node,
  58                                 const char *uname, int depth, void *data)
  59 {
  60         unsigned long l;
  61         char *p;
  62
  63         pr_debug("%s: depth: %d, uname: %s\n", __func__, depth, uname);
  64
  65         if (depth == 1 && (strcmp(uname, "chosen") == 0 ||
  66                                 strcmp(uname, "chosen@0") == 0)) {
  67                 p = of_get_flat_dt_prop(node, "linux,stdout-path", &l);
  68                 if (p != NULL && l > 0)
  69                         stdout = p; /* store pointer to stdout-path */
  70         }
  71
  72         if (stdout && strstr(stdout, uname)) {
  73                 p = of_get_flat_dt_prop(node, "compatible", &l);
  74                 pr_debug("Compatible string: %s\n", p);
  75
  76                 if ((strncmp(p, "xlnx,xps-uart16550", 18) == 0) ||
  77                         (strncmp(p, "xlnx,axi-uart16550", 18) == 0)) {
  78                         unsigned int addr;
  79
  80                         *(u32 *)data = UART16550;
  81
  82                         addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l);
  83                         addr += *(u32 *)of_get_flat_dt_prop(node,
  84                                                         "reg-offset", &l);
  85                         /* clear register offset */
  86                         return be32_to_cpu(addr) & ~3;
  87                 }
  88                 if ((strncmp(p, "xlnx,xps-uartlite", 17) == 0) ||
  89                                 (strncmp(p, "xlnx,opb-uartlite", 17) == 0) ||
  90                                 (strncmp(p, "xlnx,axi-uartlite", 17) == 0) ||
  91                                 (strncmp(p, "xlnx,mdm", 8) == 0)) {
  92                         unsigned int *addrp;
  93
  94                         *(u32 *)data = UARTLITE;
  95
  96                         addrp = of_get_flat_dt_prop(node, "reg", &l);
  97                         return be32_to_cpup(addrp); /* return address */
  98                 }
  99         }
 100         return 0;
 101 }
 102
 103 /* this function is looking for early console - Microblaze specific */
 104 int __init of_early_console(void *version)
 105 {
 106         return of_scan_flat_dt(early_init_dt_scan_chosen_serial, version);
 107 }
 108 #endif
 109
 110 void __init early_init_devtree(void *params)
 111 {
 112         pr_debug(" -> early_init_devtree(%p)\n", params);
 113
 114         /* Setup flat device-tree pointer */
 115         initial_boot_params = params;
 116
 117         /* Retrieve various informations from the /chosen node of the
 118          * device-tree, including the platform type, initrd location and
 119          * size, TCE reserve, and more ...
 120          */
 121         of_scan_flat_dt(early_init_dt_scan_chosen, cmd_line);
 122
 123         /* Scan memory nodes and rebuild MEMBLOCKs */
 124         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 125         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
 126
 127         /* Save command line for /proc/cmdline and then parse parameters */
 128         strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
 129         parse_early_param();
 130
 131         memblock_allow_resize();
 132
 133         pr_debug("Phys. mem: %lx\n", (unsigned long) memblock_phys_mem_size());
 134
 135         pr_debug(" <- early_init_devtree()\n");
 136 }
 137
 138 #ifdef CONFIG_BLK_DEV_INITRD
 139 void __init early_init_dt_setup_initrd_arch(unsigned long start,
 140                 unsigned long end)
 141 {
 142         initrd_start = (unsigned long)__va(start);
 143         initrd_end = (unsigned long)__va(end);
 144         initrd_below_start_ok = 1;
 145 }
 146 #endif
 147
 148 /*******
 149  *
 150  * New implementation of the OF "find" APIs, return a refcounted
 151  * object, call of_node_put() when done.  The device tree and list
 152  * are protected by a rw_lock.
 153  *
 154  * Note that property management will need some locking as well,
 155  * this isn't dealt with yet.
 156  *
 157  *******/
 158
 159 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
 160 static struct debugfs_blob_wrapper flat_dt_blob;
 161
 162 static int __init export_flat_device_tree(void)
 163 {
 164         struct dentry *d;
 165
 166         flat_dt_blob.data = initial_boot_params;
 167         flat_dt_blob.size = initial_boot_params->totalsize;
 168
 169         d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
 170                                 of_debugfs_root, &flat_dt_blob);
 171         if (!d)
 172                 return 1;
 173
 174         return 0;
 175 }
 176 device_initcall(export_flat_device_tree);
 177 #endif