arch/mips/pistachio/init.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Pistachio platform setup
   4  *
   5  * Copyright (C) 2014 Google, Inc.
   6  * Copyright (C) 2016 Imagination Technologies
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/io.h>
  11 #include <linux/kernel.h>
  12 #include <linux/of_address.h>
  13 #include <linux/of_fdt.h>
  14
  15 #include <asm/cacheflush.h>
  16 #include <asm/dma-coherence.h>
  17 #include <asm/fw/fw.h>
  18 #include <asm/mips-boards/generic.h>
  19 #include <asm/mips-cps.h>
  20 #include <asm/prom.h>
  21 #include <asm/smp-ops.h>
  22 #include <asm/traps.h>
  23
  24 /*
  25  * Core revision register decoding
  26  * Bits 23 to 20: Major rev
  27  * Bits 15 to 8: Minor rev
  28  * Bits 7 to 0: Maintenance rev
  29  */
  30 #define PISTACHIO_CORE_REV_REG  0xB81483D0
  31 #define PISTACHIO_CORE_REV_A1   0x00100006
  32 #define PISTACHIO_CORE_REV_B0   0x00100106
  33
  34 const char *get_system_type(void)
  35 {
  36         u32 core_rev;
  37         const char *sys_type;
  38
  39         core_rev = __raw_readl((const void *)PISTACHIO_CORE_REV_REG);
  40
  41         switch (core_rev) {
  42         case PISTACHIO_CORE_REV_B0:
  43                 sys_type = "IMG Pistachio SoC (B0)";
  44                 break;
  45
  46         case PISTACHIO_CORE_REV_A1:
  47                 sys_type = "IMG Pistachio SoC (A1)";
  48                 break;
  49
  50         default:
  51                 sys_type = "IMG Pistachio SoC";
  52                 break;
  53         }
  54
  55         return sys_type;
  56 }
  57
  58 void __init *plat_get_fdt(void)
  59 {
  60         if (fw_arg0 != -2)
  61                 panic("Device-tree not present");
  62         return (void *)fw_arg1;
  63 }
  64
  65 void __init plat_mem_setup(void)
  66 {
  67         __dt_setup_arch(plat_get_fdt());
  68 }
  69
  70 #define DEFAULT_CPC_BASE_ADDR   0x1bde0000
  71 #define DEFAULT_CDMM_BASE_ADDR  0x1bdd0000
  72
  73 phys_addr_t mips_cpc_default_phys_base(void)
  74 {
  75         return DEFAULT_CPC_BASE_ADDR;
  76 }
  77
  78 phys_addr_t mips_cdmm_phys_base(void)
  79 {
  80         return DEFAULT_CDMM_BASE_ADDR;
  81 }
  82
  83 static void __init mips_nmi_setup(void)
  84 {
  85         void *base;
  86         extern char except_vec_nmi[];
  87
  88         base = cpu_has_veic ?
  89                 (void *)(CAC_BASE + 0xa80) :
  90                 (void *)(CAC_BASE + 0x380);
  91         memcpy(base, except_vec_nmi, 0x80);
  92         flush_icache_range((unsigned long)base,
  93                            (unsigned long)base + 0x80);
  94 }
  95
  96 static void __init mips_ejtag_setup(void)
  97 {
  98         void *base;
  99         extern char except_vec_ejtag_debug[];
 100
 101         base = cpu_has_veic ?
 102                 (void *)(CAC_BASE + 0xa00) :
 103                 (void *)(CAC_BASE + 0x300);
 104         memcpy(base, except_vec_ejtag_debug, 0x80);
 105         flush_icache_range((unsigned long)base,
 106                            (unsigned long)base + 0x80);
 107 }
 108
 109 void __init prom_init(void)
 110 {
 111         board_nmi_handler_setup = mips_nmi_setup;
 112         board_ejtag_handler_setup = mips_ejtag_setup;
 113
 114         mips_cm_probe();
 115         mips_cpc_probe();
 116         register_cps_smp_ops();
 117
 118         pr_info("SoC Type: %s\n", get_system_type());
 119 }
 120
 121 void __init prom_free_prom_memory(void)
 122 {
 123 }
 124
 125 void __init device_tree_init(void)
 126 {
 127         if (!initial_boot_params)
 128                 return;
 129
 130         unflatten_and_copy_device_tree();
 131 }