arch/mips/lantiq/prom.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *
   4  * Copyright (C) 2010 John Crispin <john@phrozen.org>
   5  */
   6
   7 #include <linux/export.h>
   8 #include <linux/clk.h>
   9 #include <linux/memblock.h>
  10 #include <linux/of_fdt.h>
  11
  12 #include <asm/bootinfo.h>
  13 #include <asm/time.h>
  14 #include <asm/prom.h>
  15
  16 #include <lantiq.h>
  17
  18 #include "prom.h"
  19 #include "clk.h"
  20
  21 /* access to the ebu needs to be locked between different drivers */
  22 DEFINE_SPINLOCK(ebu_lock);
  23 EXPORT_SYMBOL_GPL(ebu_lock);
  24
  25 /*
  26  * This is needed by the VPE loader code, just set it to 0 and assume
  27  * that the firmware hardcodes this value to something useful.
  28  */
  29 unsigned long physical_memsize = 0L;
  30
  31 /*
  32  * this struct is filled by the soc specific detection code and holds
  33  * information about the specific soc type, revision and name
  34  */
  35 static struct ltq_soc_info soc_info;
  36
  37 const char *get_system_type(void)
  38 {
  39         return soc_info.sys_type;
  40 }
  41
  42 int ltq_soc_type(void)
  43 {
  44         return soc_info.type;
  45 }
  46
  47 void __init prom_free_prom_memory(void)
  48 {
  49 }
  50
  51 static void __init prom_init_cmdline(void)
  52 {
  53         int argc = fw_arg0;
  54         char **argv = (char **) KSEG1ADDR(fw_arg1);
  55         int i;
  56
  57         arcs_cmdline[0] = '\0';
  58
  59         for (i = 0; i < argc; i++) {
  60                 char *p = (char *) KSEG1ADDR(argv[i]);
  61
  62                 if (CPHYSADDR(p) && *p) {
  63                         strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
  64                         strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
  65                 }
  66         }
  67 }
  68
  69 void __init plat_mem_setup(void)
  70 {
  71         void *dtb;
  72
  73         ioport_resource.start = IOPORT_RESOURCE_START;
  74         ioport_resource.end = IOPORT_RESOURCE_END;
  75         iomem_resource.start = IOMEM_RESOURCE_START;
  76         iomem_resource.end = IOMEM_RESOURCE_END;
  77
  78         set_io_port_base((unsigned long) KSEG1);
  79
  80         if (fw_passed_dtb) /* UHI interface */
  81                 dtb = (void *)fw_passed_dtb;
  82         else if (__dtb_start != __dtb_end)
  83                 dtb = (void *)__dtb_start;
  84         else
  85                 panic("no dtb found");
  86
  87         /*
  88          * Load the devicetree. This causes the chosen node to be
  89          * parsed resulting in our memory appearing
  90          */
  91         __dt_setup_arch(dtb);
  92 }
  93
  94 void __init device_tree_init(void)
  95 {
  96         unflatten_and_copy_device_tree();
  97 }
  98
  99 void __init prom_init(void)
 100 {
 101         /* call the soc specific detetcion code and get it to fill soc_info */
 102         ltq_soc_detect(&soc_info);
 103         snprintf(soc_info.sys_type, LTQ_SYS_TYPE_LEN - 1, "%s rev %s",
 104                 soc_info.name, soc_info.rev_type);
 105         soc_info.sys_type[LTQ_SYS_TYPE_LEN - 1] = '\0';
 106         pr_info("SoC: %s\n", soc_info.sys_type);
 107         prom_init_cmdline();
 108
 109 #if defined(CONFIG_MIPS_MT_SMP)
 110         if (register_vsmp_smp_ops())
 111                 panic("failed to register_vsmp_smp_ops()");
 112 #endif
 113 }