arch/mips/lantiq/falcon/prom.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *
   4  * Copyright (C) 2012 Thomas Langer <thomas.langer@lantiq.com>
   5  * Copyright (C) 2012 John Crispin <john@phrozen.org>
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <asm/cacheflush.h>
  10 #include <asm/traps.h>
  11 #include <asm/io.h>
  12
  13 #include <lantiq_soc.h>
  14
  15 #include "../prom.h"
  16
  17 #define SOC_FALCON      "Falcon"
  18 #define SOC_FALCON_D    "Falcon-D"
  19 #define SOC_FALCON_V    "Falcon-V"
  20 #define SOC_FALCON_M    "Falcon-M"
  21
  22 #define COMP_FALCON     "lantiq,falcon"
  23
  24 #define PART_SHIFT      12
  25 #define PART_MASK       0x0FFFF000
  26 #define REV_SHIFT       28
  27 #define REV_MASK        0xF0000000
  28 #define SREV_SHIFT      22
  29 #define SREV_MASK       0x03C00000
  30 #define TYPE_SHIFT      26
  31 #define TYPE_MASK       0x3C000000
  32
  33 /* reset, nmi and ejtag exception vectors */
  34 #define BOOT_REG_BASE   (KSEG1 | 0x1F200000)
  35 #define BOOT_RVEC       (BOOT_REG_BASE | 0x00)
  36 #define BOOT_NVEC       (BOOT_REG_BASE | 0x04)
  37 #define BOOT_EVEC       (BOOT_REG_BASE | 0x08)
  38
  39 void __init ltq_soc_nmi_setup(void)
  40 {
  41         extern void (*nmi_handler)(void);
  42
  43         ltq_w32((unsigned long)&nmi_handler, (void *)BOOT_NVEC);
  44 }
  45
  46 void __init ltq_soc_ejtag_setup(void)
  47 {
  48         extern void (*ejtag_debug_handler)(void);
  49
  50         ltq_w32((unsigned long)&ejtag_debug_handler, (void *)BOOT_EVEC);
  51 }
  52
  53 void __init ltq_soc_detect(struct ltq_soc_info *i)
  54 {
  55         u32 type;
  56         i->partnum = (ltq_r32(FALCON_CHIPID) & PART_MASK) >> PART_SHIFT;
  57         i->rev = (ltq_r32(FALCON_CHIPID) & REV_MASK) >> REV_SHIFT;
  58         i->srev = ((ltq_r32(FALCON_CHIPCONF) & SREV_MASK) >> SREV_SHIFT);
  59         i->compatible = COMP_FALCON;
  60         i->type = SOC_TYPE_FALCON;
  61         sprintf(i->rev_type, "%c%d%d", (i->srev & 0x4) ? ('B') : ('A'),
  62                 i->rev & 0x7, (i->srev & 0x3) + 1);
  63
  64         switch (i->partnum) {
  65         case SOC_ID_FALCON:
  66                 type = (ltq_r32(FALCON_CHIPTYPE) & TYPE_MASK) >> TYPE_SHIFT;
  67                 switch (type) {
  68                 case 0:
  69                         i->name = SOC_FALCON_D;
  70                         break;
  71                 case 1:
  72                         i->name = SOC_FALCON_V;
  73                         break;
  74                 case 2:
  75                         i->name = SOC_FALCON_M;
  76                         break;
  77                 default:
  78                         i->name = SOC_FALCON;
  79                         break;
  80                 }
  81                 break;
  82
  83         default:
  84                 unreachable();
  85                 break;
  86         }
  87
  88         board_nmi_handler_setup = ltq_soc_nmi_setup;
  89         board_ejtag_handler_setup = ltq_soc_ejtag_setup;
  90 }