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 unsigned int ltq_get_soc_type(void)
  31 {
  32         return soc_info.type;
  33 }
  34 EXPORT_SYMBOL(ltq_get_soc_type);
  35
  36 const char *get_system_type(void)
  37 {
  38         return soc_info.sys_type;
  39 }
  40
  41 void prom_free_prom_memory(void)
  42 {
  43 }
  44
  45 static void __init prom_init_cmdline(void)
  46 {
  47         int argc = fw_arg0;
  48         char **argv = (char **) KSEG1ADDR(fw_arg1);
  49         int i;
  50
  51         arcs_cmdline[0] = '\0';
  52
  53         for (i = 0; i < argc; i++) {
  54                 char *p = (char *) KSEG1ADDR(argv[i]);
  55
  56                 if (CPHYSADDR(p) && *p) {
  57                         strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
  58                         strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
  59                 }
  60         }
  61 }
  62
  63 void __init plat_mem_setup(void)
  64 {
  65         ioport_resource.start = IOPORT_RESOURCE_START;
  66         ioport_resource.end = IOPORT_RESOURCE_END;
  67         iomem_resource.start = IOMEM_RESOURCE_START;
  68         iomem_resource.end = IOMEM_RESOURCE_END;
  69
  70         set_io_port_base((unsigned long) KSEG1);
  71
  72         /*
  73          * Load the builtin devicetree. This causes the chosen node to be
  74          * parsed resulting in our memory appearing
  75          */
  76         __dt_setup_arch(&__dtb_start);
  77 }
  78
  79 void __init prom_init(void)
  80 {
  81         /* call the soc specific detetcion code and get it to fill soc_info */
  82         ltq_soc_detect(&soc_info);
  83         snprintf(soc_info.sys_type, LTQ_SYS_TYPE_LEN - 1, "%s rev %s",
  84                 soc_info.name, soc_info.rev_type);
  85         soc_info.sys_type[LTQ_SYS_TYPE_LEN - 1] = '\0';
  86         pr_info("SoC: %s\n", soc_info.sys_type);
  87         prom_init_cmdline();
  88
  89 #if defined(CONFIG_MIPS_MT_SMP)
  90         if (register_vsmp_smp_ops())
  91                 panic("failed to register_vsmp_smp_ops()");
  92 #endif
  93 }
  94
  95 int __init plat_of_setup(void)
  96 {
  97         static struct of_device_id of_ids[3];
  98
  99         if (!of_have_populated_dt())
 100                 panic("device tree not present");
 101
 102         strncpy(of_ids[0].compatible, soc_info.compatible,
 103                 sizeof(of_ids[0].compatible));
 104         strncpy(of_ids[1].compatible, "simple-bus",
 105                 sizeof(of_ids[1].compatible));
 106         return of_platform_bus_probe(NULL, of_ids, NULL);
 107 }
 108
 109 arch_initcall(plat_of_setup);