1/* 2 * arch/arm/mach-footbridge/include/mach/system.h 3 * 4 * Copyright (C) 1996-1999 Russell King. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10#include <linux/io.h> 11#include <asm/hardware/dec21285.h> 12#include <mach/hardware.h> 13#include <asm/leds.h> 14#include <asm/mach-types.h> 15 16static inline void arch_idle(void) 17{ 18 cpu_do_idle(); 19} 20 21static inline void arch_reset(char mode, const char *cmd) 22{ 23 if (mode == 's') { 24 /* 25 * Jump into the ROM 26 */ 27 cpu_reset(0x41000000); 28 } else { 29 if (machine_is_netwinder()) { 30 /* open up the SuperIO chip 31 */ 32 outb(0x87, 0x370); 33 outb(0x87, 0x370); 34 35 /* aux function group 1 (logical device 7) 36 */ 37 outb(0x07, 0x370); 38 outb(0x07, 0x371); 39 40 /* set GP16 for WD-TIMER output 41 */ 42 outb(0xe6, 0x370); 43 outb(0x00, 0x371); 44 45 /* set a RED LED and toggle WD_TIMER for rebooting 46 */ 47 outb(0xc4, 0x338); 48 } else { 49 /* 50 * Force the watchdog to do a CPU reset. 51 * 52 * After making sure that the watchdog is disabled 53 * (so we can change the timer registers) we first 54 * enable the timer to autoreload itself. Next, the 55 * timer interval is set really short and any 56 * current interrupt request is cleared (so we can 57 * see an edge transition). Finally, TIMER4 is 58 * enabled as the watchdog. 59 */ 60 *CSR_SA110_CNTL &= ~(1 << 13); 61 *CSR_TIMER4_CNTL = TIMER_CNTL_ENABLE | 62 TIMER_CNTL_AUTORELOAD | 63 TIMER_CNTL_DIV16; 64 *CSR_TIMER4_LOAD = 0x2; 65 *CSR_TIMER4_CLR = 0; 66 *CSR_SA110_CNTL |= (1 << 13); 67 } 68 } 69} 70