1 /* 2 * This program is free software; you can redistribute it and/or modify it 3 * under the terms of the GNU General Public License version 2 as published 4 * by the Free Software Foundation. 5 * 6 * Copyright (C) 2012 Thomas Langer <thomas.langer@lantiq.com> 7 * Copyright (C) 2012 John Crispin <john@phrozen.org> 8 */ 9 10 #include <linux/init.h> 11 #include <linux/io.h> 12 #include <linux/pm.h> 13 #include <asm/reboot.h> 14 #include <linux/export.h> 15 16 #include <lantiq_soc.h> 17 18 /* 19 * Dummy implementation. Used to allow platform code to find out what 20 * source was booted from 21 */ 22 unsigned char ltq_boot_select(void) 23 { 24 return BS_SPI; 25 } 26 27 #define BOOT_REG_BASE (KSEG1 | 0x1F200000) 28 #define BOOT_PW1_REG (BOOT_REG_BASE | 0x20) 29 #define BOOT_PW2_REG (BOOT_REG_BASE | 0x24) 30 #define BOOT_PW1 0x4C545100 31 #define BOOT_PW2 0x0051544C 32 33 #define WDT_REG_BASE (KSEG1 | 0x1F8803F0) 34 #define WDT_PW1 0x00BE0000 35 #define WDT_PW2 0x00DC0000 36 37 static void machine_restart(char *command) 38 { 39 local_irq_disable(); 40 41 /* reboot magic */ 42 ltq_w32(BOOT_PW1, (void *)BOOT_PW1_REG); /* 'LTQ\0' */ 43 ltq_w32(BOOT_PW2, (void *)BOOT_PW2_REG); /* '\0QTL' */ 44 ltq_w32(0, (void *)BOOT_REG_BASE); /* reset Bootreg RVEC */ 45 46 /* watchdog magic */ 47 ltq_w32(WDT_PW1, (void *)WDT_REG_BASE); 48 ltq_w32(WDT_PW2 | 49 (0x3 << 26) | /* PWL */ 50 (0x2 << 24) | /* CLKDIV */ 51 (0x1 << 31) | /* enable */ 52 (1), /* reload */ 53 (void *)WDT_REG_BASE); 54 unreachable(); 55 } 56 57 static void machine_halt(void) 58 { 59 local_irq_disable(); 60 unreachable(); 61 } 62 63 static void machine_power_off(void) 64 { 65 local_irq_disable(); 66 unreachable(); 67 } 68 69 static int __init mips_reboot_setup(void) 70 { 71 _machine_restart = machine_restart; 72 _machine_halt = machine_halt; 73 pm_power_off = machine_power_off; 74 return 0; 75 } 76 77 arch_initcall(mips_reboot_setup); 78