LXR linux/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/export.h>
  18#include <linux/kernel.h>
  19#include <linux/string.h>
  20#include <linux/init.h>
  21#include <linux/threads.h>
  22#include <linux/spinlock.h>
  23#include <linux/types.h>
  24#include <linux/pci.h>
  25#include <linux/stringify.h>
  26#include <linux/delay.h>
  27#include <linux/initrd.h>
  28#include <linux/bitops.h>
  29#include <linux/kexec.h>
  30#include <linux/debugfs.h>
  31#include <linux/irq.h>
  32#include <linux/memblock.h>
  33#include <linux/of_fdt.h>
  34
  35#include <asm/prom.h>
  36#include <asm/page.h>
  37#include <asm/processor.h>
  38#include <asm/irq.h>
  39#include <linux/io.h>
  40#include <asm/mmu.h>
  41#include <asm/pgtable.h>
  42#include <asm/sections.h>
  43#include <asm/pci-bridge.h>
  44
  45#ifdef CONFIG_EARLY_PRINTK
  46static const char *stdout;
  47
  48static int __init early_init_dt_scan_chosen_serial(unsigned long node,
  49                                const char *uname, int depth, void *data)
  50{
  51        int l;
  52        const char *p;
  53
  54        pr_debug("%s: depth: %d, uname: %s\n", __func__, depth, uname);
  55
  56        if (depth == 1 && (strcmp(uname, "chosen") == 0 ||
  57                                strcmp(uname, "chosen@0") == 0)) {
  58                p = of_get_flat_dt_prop(node, "linux,stdout-path", &l);
  59                if (p != NULL && l > 0)
  60                        stdout = p; /* store pointer to stdout-path */
  61        }
  62
  63        if (stdout && strstr(stdout, uname)) {
  64                p = of_get_flat_dt_prop(node, "compatible", &l);
  65                pr_debug("Compatible string: %s\n", p);
  66
  67                if ((strncmp(p, "xlnx,xps-uart16550", 18) == 0) ||
  68                        (strncmp(p, "xlnx,axi-uart16550", 18) == 0)) {
  69                        unsigned int addr;
  70
  71                        *(u32 *)data = UART16550;
  72
  73                        addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l);
  74                        addr += *(u32 *)of_get_flat_dt_prop(node,
  75                                                        "reg-offset", &l);
  76                        /* clear register offset */
  77                        return be32_to_cpu(addr) & ~3;
  78                }
  79                if ((strncmp(p, "xlnx,xps-uartlite", 17) == 0) ||
  80                                (strncmp(p, "xlnx,opb-uartlite", 17) == 0) ||
  81                                (strncmp(p, "xlnx,axi-uartlite", 17) == 0) ||
  82                                (strncmp(p, "xlnx,mdm", 8) == 0)) {
  83                        const unsigned int *addrp;
  84
  85                        *(u32 *)data = UARTLITE;
  86
  87                        addrp = of_get_flat_dt_prop(node, "reg", &l);
  88                        return be32_to_cpup(addrp); /* return address */
  89                }
  90        }
  91        return 0;
  92}
  93
  94/* this function is looking for early console - Microblaze specific */
  95int __init of_early_console(void *version)
  96{
  97        return of_scan_flat_dt(early_init_dt_scan_chosen_serial, version);
  98}
  99#endif
 100
 101void __init early_init_devtree(void *params)
 102{
 103        pr_debug(" -> early_init_devtree(%p)\n", params);
 104
 105        early_init_dt_scan(params);
 106        if (!strlen(boot_command_line))
 107                strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
 108
 109        parse_early_param();
 110
 111        memblock_allow_resize();
 112
 113        pr_debug("Phys. mem: %lx\n", (unsigned long) memblock_phys_mem_size());
 114
 115        pr_debug(" <- early_init_devtree()\n");
 116}
 117