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 /* CPU0 Reset Source Register */ 19 #define SYS1_CPU0RS 0x0040 20 /* reset cause mask */ 21 #define CPU0RS_MASK 0x0003 22 /* CPU0 Boot Mode Register */ 23 #define SYS1_BM 0x00a0 24 /* boot mode mask */ 25 #define BM_MASK 0x0005 26 27 /* allow platform code to find out what surce we booted from */ 28 unsigned char ltq_boot_select(void) 29 { 30 return ltq_sys1_r32(SYS1_BM) & BM_MASK; 31 } 32 33 /* allow the watchdog driver to find out what the boot reason was */ 34 int ltq_reset_cause(void) 35 { 36 return ltq_sys1_r32(SYS1_CPU0RS) & CPU0RS_MASK; 37 } 38 EXPORT_SYMBOL_GPL(ltq_reset_cause); 39 40 #define BOOT_REG_BASE (KSEG1 | 0x1F200000) 41 #define BOOT_PW1_REG (BOOT_REG_BASE | 0x20) 42 #define BOOT_PW2_REG (BOOT_REG_BASE | 0x24) 43 #define BOOT_PW1 0x4C545100 44 #define BOOT_PW2 0x0051544C 45 46 #define WDT_REG_BASE (KSEG1 | 0x1F8803F0) 47 #define WDT_PW1 0x00BE0000 48 #define WDT_PW2 0x00DC0000 49 50 static void machine_restart(char *command) 51 { 52 local_irq_disable(); 53 54 /* reboot magic */ 55 ltq_w32(BOOT_PW1, (void *)BOOT_PW1_REG); /* 'LTQ\0' */ 56 ltq_w32(BOOT_PW2, (void *)BOOT_PW2_REG); /* '\0QTL' */ 57 ltq_w32(0, (void *)BOOT_REG_BASE); /* reset Bootreg RVEC */ 58 59 /* watchdog magic */ 60 ltq_w32(WDT_PW1, (void *)WDT_REG_BASE); 61 ltq_w32(WDT_PW2 | 62 (0x3 << 26) | /* PWL */ 63 (0x2 << 24) | /* CLKDIV */ 64 (0x1 << 31) | /* enable */ 65 (1), /* reload */ 66 (void *)WDT_REG_BASE); 67 unreachable(); 68 } 69 70 static void machine_halt(void) 71 { 72 local_irq_disable(); 73 unreachable(); 74 } 75 76 static void machine_power_off(void) 77 { 78 local_irq_disable(); 79 unreachable(); 80 } 81 82 static int __init mips_reboot_setup(void) 83 { 84 _machine_restart = machine_restart; 85 _machine_halt = machine_halt; 86 pm_power_off = machine_power_off; 87 return 0; 88 } 89 90 arch_initcall(mips_reboot_setup); 91