| 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) 2011 Thomas Langer <thomas.langer@lantiq.com> |
| 7 | * Copyright (C) 2011 John Crispin <blogic@openwrt.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 LTQ_SYS1_CPU0RS 0x0040 |
| 20 | /* reset cause mask */ |
| 21 | #define LTQ_CPU0RS_MASK 0x0003 |
| 22 | |
| 23 | int |
| 24 | ltq_reset_cause(void) |
| 25 | { |
| 26 | return ltq_sys1_r32(LTQ_SYS1_CPU0RS) & LTQ_CPU0RS_MASK; |
| 27 | } |
| 28 | EXPORT_SYMBOL_GPL(ltq_reset_cause); |
| 29 | |
| 30 | #define BOOT_REG_BASE (KSEG1 | 0x1F200000) |
| 31 | #define BOOT_PW1_REG (BOOT_REG_BASE | 0x20) |
| 32 | #define BOOT_PW2_REG (BOOT_REG_BASE | 0x24) |
| 33 | #define BOOT_PW1 0x4C545100 |
| 34 | #define BOOT_PW2 0x0051544C |
| 35 | |
| 36 | #define WDT_REG_BASE (KSEG1 | 0x1F8803F0) |
| 37 | #define WDT_PW1 0x00BE0000 |
| 38 | #define WDT_PW2 0x00DC0000 |
| 39 | |
| 40 | static void |
| 41 | ltq_machine_restart(char *command) |
| 42 | { |
| 43 | pr_notice("System restart\n"); |
| 44 | local_irq_disable(); |
| 45 | |
| 46 | /* reboot magic */ |
| 47 | ltq_w32(BOOT_PW1, (void *)BOOT_PW1_REG); /* 'LTQ\0' */ |
| 48 | ltq_w32(BOOT_PW2, (void *)BOOT_PW2_REG); /* '\0QTL' */ |
| 49 | ltq_w32(0, (void *)BOOT_REG_BASE); /* reset Bootreg RVEC */ |
| 50 | |
| 51 | /* watchdog magic */ |
| 52 | ltq_w32(WDT_PW1, (void *)WDT_REG_BASE); |
| 53 | ltq_w32(WDT_PW2 | |
| 54 | (0x3 << 26) | /* PWL */ |
| 55 | (0x2 << 24) | /* CLKDIV */ |
| 56 | (0x1 << 31) | /* enable */ |
| 57 | (1), /* reload */ |
| 58 | (void *)WDT_REG_BASE); |
| 59 | unreachable(); |
| 60 | } |
| 61 | |
| 62 | static void |
| 63 | ltq_machine_halt(void) |
| 64 | { |
| 65 | pr_notice("System halted.\n"); |
| 66 | local_irq_disable(); |
| 67 | unreachable(); |
| 68 | } |
| 69 | |
| 70 | static void |
| 71 | ltq_machine_power_off(void) |
| 72 | { |
| 73 | pr_notice("Please turn off the power now.\n"); |
| 74 | local_irq_disable(); |
| 75 | unreachable(); |
| 76 | } |
| 77 | |
| 78 | static int __init |
| 79 | mips_reboot_setup(void) |
| 80 | { |
| 81 | _machine_restart = ltq_machine_restart; |
| 82 | _machine_halt = ltq_machine_halt; |
| 83 | pm_power_off = ltq_machine_power_off; |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | arch_initcall(mips_reboot_setup); |
| 88 | |
