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/of_platform.h>
  12 #include <asm/bootinfo.h>
  13 #include <asm/time.h>
  14
  15 #include <lantiq.h>
  16
  17 #include "prom.h"
  18 #include "clk.h"
  19
  20 /* access to the ebu needs to be locked between different drivers */
  21 DEFINE_SPINLOCK(ebu_lock);
  22 EXPORT_SYMBOL_GPL(ebu_lock);
  23
  24 /*
  25  * this struct is filled by the soc specific detection code and holds
  26  * information about the specific soc type, revision and name
  27  */
  28 static struct ltq_soc_info soc_info;
  29
  30 const char *get_system_type(void)
  31 {
  32         return soc_info.sys_type;
  33 }
  34
  35 void prom_free_prom_memory(void)
  36 {
  37 }
  38
  39 static void __init prom_init_cmdline(void)
  40 {
  41         int argc = fw_arg0;
  42         char **argv = (char **) KSEG1ADDR(fw_arg1);
  43         int i;
  44
  45         arcs_cmdline[0] = '\0';
  46
  47         for (i = 0; i < argc; i++) {
  48                 char *p = (char *) KSEG1ADDR(argv[i]);
  49
  50                 if (CPHYSADDR(p) && *p) {
  51                         strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
  52                         strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
  53                 }
  54         }
  55 }
  56
  57 void __init plat_mem_setup(void)
  58 {
  59         ioport_resource.start = IOPORT_RESOURCE_START;
  60         ioport_resource.end = IOPORT_RESOURCE_END;
  61         iomem_resource.start = IOMEM_RESOURCE_START;
  62         iomem_resource.end = IOMEM_RESOURCE_END;
  63
  64         set_io_port_base((unsigned long) KSEG1);
  65
  66         /*
  67          * Load the builtin devicetree. This causes the chosen node to be
  68          * parsed resulting in our memory appearing
  69          */
  70         __dt_setup_arch(&__dtb_start);
  71 }
  72
  73 void __init prom_init(void)
  74 {
  75         /* call the soc specific detetcion code and get it to fill soc_info */
  76         ltq_soc_detect(&soc_info);
  77         snprintf(soc_info.sys_type, LTQ_SYS_TYPE_LEN - 1, "%s rev %s",
  78                 soc_info.name, soc_info.rev_type);
  79         soc_info.sys_type[LTQ_SYS_TYPE_LEN - 1] = '\0';
  80         pr_info("SoC: %s\n", soc_info.sys_type);
  81         prom_init_cmdline();
  82
  83 #if defined(CONFIG_MIPS_MT_SMP)
  84         if (register_vsmp_smp_ops())
  85                 panic("failed to register_vsmp_smp_ops()");
  86 #endif
  87 }
  88
  89 int __init plat_of_setup(void)
  90 {
  91         static struct of_device_id of_ids[3];
  92
  93         if (!of_have_populated_dt())
  94                 panic("device tree not present");
  95
  96         strncpy(of_ids[0].compatible, soc_info.compatible,
  97                 sizeof(of_ids[0].compatible));
  98         strncpy(of_ids[1].compatible, "simple-bus",
  99                 sizeof(of_ids[1].compatible));
 100         return of_platform_bus_probe(NULL, of_ids, NULL);
 101 }
 102
 103 arch_initcall(plat_of_setup);