arch/mips/lantiq/falcon/reset.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/init.h>
   9 #include <linux/io.h>
  10 #include <linux/pm.h>
  11 #include <asm/reboot.h>
  12 #include <linux/export.h>
  13
  14 #include <lantiq_soc.h>
  15
  16 /*
  17  * Dummy implementation.  Used to allow platform code to find out what
  18  * source was booted from
  19  */
  20 unsigned char ltq_boot_select(void)
  21 {
  22         return BS_SPI;
  23 }
  24
  25 #define BOOT_REG_BASE   (KSEG1 | 0x1F200000)
  26 #define BOOT_PW1_REG    (BOOT_REG_BASE | 0x20)
  27 #define BOOT_PW2_REG    (BOOT_REG_BASE | 0x24)
  28 #define BOOT_PW1        0x4C545100
  29 #define BOOT_PW2        0x0051544C
  30
  31 #define WDT_REG_BASE    (KSEG1 | 0x1F8803F0)
  32 #define WDT_PW1         0x00BE0000
  33 #define WDT_PW2         0x00DC0000
  34
  35 static void machine_restart(char *command)
  36 {
  37         local_irq_disable();
  38
  39         /* reboot magic */
  40         ltq_w32(BOOT_PW1, (void *)BOOT_PW1_REG); /* 'LTQ\0' */
  41         ltq_w32(BOOT_PW2, (void *)BOOT_PW2_REG); /* '\0QTL' */
  42         ltq_w32(0, (void *)BOOT_REG_BASE); /* reset Bootreg RVEC */
  43
  44         /* watchdog magic */
  45         ltq_w32(WDT_PW1, (void *)WDT_REG_BASE);
  46         ltq_w32(WDT_PW2 |
  47                 (0x3 << 26) | /* PWL */
  48                 (0x2 << 24) | /* CLKDIV */
  49                 (0x1 << 31) | /* enable */
  50                 (1), /* reload */
  51                 (void *)WDT_REG_BASE);
  52         unreachable();
  53 }
  54
  55 static void machine_halt(void)
  56 {
  57         local_irq_disable();
  58         unreachable();
  59 }
  60
  61 static void machine_power_off(void)
  62 {
  63         local_irq_disable();
  64         unreachable();
  65 }
  66
  67 static int __init mips_reboot_setup(void)
  68 {
  69         _machine_restart = machine_restart;
  70         _machine_halt = machine_halt;
  71         pm_power_off = machine_power_off;
  72         return 0;
  73 }
  74
  75 arch_initcall(mips_reboot_setup);