arch/mips/lantiq/prom.c

   1 /*
   2  *  This program is free software; you can redistribute it and/or modify it
   3  *  under the terms of the GNU General Public License version 2 as published
   4  *  by the Free Software Foundation.
   5  *
   6  * Copyright (C) 2010 John Crispin <blogic@openwrt.org>
   7  */
   8
   9 #include <linux/export.h>
  10 #include <linux/clk.h>
  11 #include <linux/bootmem.h>
  12 #include <linux/of_platform.h>
  13 #include <linux/of_fdt.h>
  14
  15 #include <asm/bootinfo.h>
  16 #include <asm/time.h>
  17 #include <asm/prom.h>
  18
  19 #include <lantiq.h>
  20
  21 #include "prom.h"
  22 #include "clk.h"
  23
  24 /* access to the ebu needs to be locked between different drivers */
  25 DEFINE_SPINLOCK(ebu_lock);
  26 EXPORT_SYMBOL_GPL(ebu_lock);
  27
  28 /*
  29  * this struct is filled by the soc specific detection code and holds
  30  * information about the specific soc type, revision and name
  31  */
  32 static struct ltq_soc_info soc_info;
  33
  34 const char *get_system_type(void)
  35 {
  36         return soc_info.sys_type;
  37 }
  38
  39 void prom_free_prom_memory(void)
  40 {
  41 }
  42
  43 static void __init prom_init_cmdline(void)
  44 {
  45         int argc = fw_arg0;
  46         char **argv = (char **) KSEG1ADDR(fw_arg1);
  47         int i;
  48
  49         arcs_cmdline[0] = '\0';
  50
  51         for (i = 0; i < argc; i++) {
  52                 char *p = (char *) KSEG1ADDR(argv[i]);
  53
  54                 if (CPHYSADDR(p) && *p) {
  55                         strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
  56                         strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
  57                 }
  58         }
  59 }
  60
  61 void __init plat_mem_setup(void)
  62 {
  63         ioport_resource.start = IOPORT_RESOURCE_START;
  64         ioport_resource.end = IOPORT_RESOURCE_END;
  65         iomem_resource.start = IOMEM_RESOURCE_START;
  66         iomem_resource.end = IOMEM_RESOURCE_END;
  67
  68         set_io_port_base((unsigned long) KSEG1);
  69
  70         /*
  71          * Load the builtin devicetree. This causes the chosen node to be
  72          * parsed resulting in our memory appearing
  73          */
  74         __dt_setup_arch(&__dtb_start);
  75 }
  76
  77 void __init device_tree_init(void)
  78 {
  79         unsigned long base, size;
  80
  81         if (!initial_boot_params)
  82                 return;
  83
  84         base = virt_to_phys((void *)initial_boot_params);
  85         size = be32_to_cpu(initial_boot_params->totalsize);
  86
  87         /* Before we do anything, lets reserve the dt blob */
  88         reserve_bootmem(base, size, BOOTMEM_DEFAULT);
  89
  90         unflatten_device_tree();
  91 }
  92
  93 void __init prom_init(void)
  94 {
  95         /* call the soc specific detetcion code and get it to fill soc_info */
  96         ltq_soc_detect(&soc_info);
  97         snprintf(soc_info.sys_type, LTQ_SYS_TYPE_LEN - 1, "%s rev %s",
  98                 soc_info.name, soc_info.rev_type);
  99         soc_info.sys_type[LTQ_SYS_TYPE_LEN - 1] = '\0';
 100         pr_info("SoC: %s\n", soc_info.sys_type);
 101         prom_init_cmdline();
 102
 103 #if defined(CONFIG_MIPS_MT_SMP)
 104         if (register_vsmp_smp_ops())
 105                 panic("failed to register_vsmp_smp_ops()");
 106 #endif
 107 }
 108
 109 int __init plat_of_setup(void)
 110 {
 111         static struct of_device_id of_ids[3];
 112
 113         if (!of_have_populated_dt())
 114                 panic("device tree not present");
 115
 116         strlcpy(of_ids[0].compatible, soc_info.compatible,
 117                 sizeof(of_ids[0].compatible));
 118         strncpy(of_ids[1].compatible, "simple-bus",
 119                 sizeof(of_ids[1].compatible));
 120         return of_platform_populate(NULL, of_ids, NULL, NULL);
 121 }
 122
 123 arch_initcall(plat_of_setup);