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); 76